CN103089153A - Wide-tooth cone composite drill bit - Google Patents

Abstract

Translated fromChinese

本发明公开了一种宽齿牙轮复合钻头，属于石油天然气、矿山工程、建筑基础工程施工、地质、水文等钻探设备技术领域，具体的讲涉及一种宽齿牙轮复合钻头。包括钻头体、固定切削结构和至少一个牙轮，牙轮和固定切削结构布置在钻头体上，固定切削结构上设置有固定切削齿，牙轮通过轴承结构与钻头体形成转动连接，牙轮上镶固有横镶牙齿，且横镶牙齿的齿顶偏转角α的取值范围是70°≤|α|≤90°，横镶牙齿的镶固部分的横断面轮廓为非圆形。本发明提出一种新的牙轮结构形式，该复合钻头，牙轮工作平稳，钻头工作稳定性好，相对现有复合钻头具有更高破岩效率的同时，还具有更长的钻头牙齿和轴承的寿命，从而具有更长的钻头使用寿命。

The invention discloses a wide-toothed cone composite drill bit, which belongs to the technical fields of drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and specifically relates to a wide-toothed cone composite drill bit. It includes a drill bit body, a fixed cutting structure and at least one cone. The cone and the fixed cutting structure are arranged on the drill bit body. Fixed cutting teeth are arranged on the fixed cutting structure. The cone forms a rotational connection with the drill body through a bearing structure. The inlay has horizontal inlay teeth, and the range of the deflection angle α of the tooth tip of the inlay teeth is 70°≤|α|≤90°, and the cross-sectional profile of the inlay portion of the inlay teeth is non-circular. The invention proposes a new roller cone structure. The composite drill bit has stable roller cone operation and good drill stability. Compared with the existing composite drill bit, it has higher rock-breaking efficiency and has longer drill teeth and bearings. life, which has a longer drill life.

Description

A kind of wide tooth roller composite drill bit

Technical field

The invention belongs to the drilling equipment technical fields such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology, relate to concretely a kind of composite drill bit.

Background technology

Drill bit be in drilling engineering in order to fractured rock, form the rock crushing tool of pit shaft.Rock bit and PDC drill bit are drill bits commonly used in drilling engineering.The tricone bit that uses in drilling engineering at present comprises steel-tooth bit (claim not only mill tooth bit) and tungsten carbide insert bit (but also claiming tungsten carbide insert bit).Steel-tooth bit is directly to mill out cutting teeth on the gear wheel base substrate, and the intensity of tooth is lower, abrasion resistance is relatively poor, generally is used for soft formation; Tungsten carbide insert bit is inlaid solid carbide alloy tooth (hereinafter to be referred as hard-metal insert or tooth) in the perforation that cone body is reserved, and the hardness of hard-metal insert and abrasion resistance obviously are better than steel-tooth, general being used for than hard formation.Tricone bit is mainly with the broken rock of the form of impacting crushing, and namely tooth is by to impact, the extruding of rock with scrape with a small amount of slippage and cut fractured rock, and its shortcoming is that capacity usage ratio is not high, efficiency of breaking rock is lower, and in the drill bit course of work, the impact that bearing is subject to is large, and dynamic load factor is large.On form of structure, in order to satisfy the needs of the broken broken rock working method of insert bit punching press, existing drill bit has adopted following three technological means: one, the inlaid solid part in bottom of the cutting teeth (tooth) on existing insert bit is column type, top exposure part is shunk transition by lower cylindrical gradually to the tooth axis, mostly be wedge shape or taper, the addendum width of tooth all is significantly less than the diameter of the inlaid solid part in bottom, to form more sharp-pointed impact head.The dynamic load that is subjected to due to tooth is large, and the tooth size less, so integral body or the local fracture of tooth easily occur.Its two, the tooth top zero deflection (being that the tooth top deflection angle is 0 °) of existing most of tri-cone insert bits gear wheel upper teeth also has tooth (cutting teeth) tooth top of the part gear ring of a small amount of drill bit that deflection is arranged, deflection angle is generally in 50 °.The deflection of tooth be for cater to tooth impact the slippage be pressed into after rock scrape butt to, the slippage of rock scraped cut effect (amount) to increase tooth.They are three years old, there is skew in the gear wheel of most tricone bits, its purpose is, pure rolling can't occur when making gear wheel roll broken rock on bottom rock in skew, when making the broken rock of tooth on gear wheel, slippage increases, tooth slippage on the larger gear wheel of deviant is scraped and is cut more obviously, but the wearing and tearing that also produce because of slippage simultaneously are also larger.

The PDC drill bit is cut the form fractured rock to scrape, and the PDC drill bit can effectively break rock, and to creep into the prerequisite that forms drilling depth be PDC tooth wedging formation rock effectively.After PDC tooth wedging rock, under the rotarily driving of bit body, shear action makes catalase to rock formation.Very hard PDC is difficult to the wedging rock when rock, or the PDC tooth has when being difficult to the wedging rock after wearing and tearing, and PDC drill bit efficiency of breaking rock will obviously reduce.

Baker Hughes Inc. proposes a kind of gear wheel-PDC hybrid bit and (has all proposed patent application in the U.S. and other countries, as PTC WO2010/132232 etc.), this drill bit has increased the gear wheel cutting structure on traditional PDC cutting structure basis, combined by stationary cutting structure and gear wheel cutting structure.Wherein, the stationary cutting structure of gear wheel-PDC hybrid bit by some PDC fixedly wing form, fixedly be furnished with fixedly cutting teeth (being the PDC tooth) on wing, when bit crept into, fixedly the PDC tooth on wing was to scrape the broken rock of butt formula; Gear wheel cutting structure and the rock bit of gear wheel-PDC hybrid bit are similar, and the tooth on gear wheel is mainly with the broken rock of the mode of impacting crushing.Because gear wheel breaks rock in the mode of impacting crushing, the up-down vibration that produces in the gear wheel course of work can directly affect the job stability of PDC stationary cutting structure, thereby cause following adverse consequences: at first, the shock loading that extensional vibration brings easily causes the damage of PDC tooth, shortens the application life of drill bit; Secondly, the extensional vibration meeting makes the depth of tooth penetration generation frequent variations of the PDC tooth in stationary cutting structure, even may cause the PDC tooth frequently to break away from the shaft bottom when serious, thereby reduce to a certain extent the efficiency of breaking rock of drill bit.In addition, still with the broken rock of the mode of impacting crushing, the operating mode of gear wheel bearing is similar to tricone bit, causes bearing life short for the gear wheel on this composite drill bit, and the working life of bearing has formed obvious restriction to the bulk life time of drill bit.

Summary of the invention

The object of the invention is to: a kind of wide tooth roller composite drill bit is provided, it proposes a kind of new cone structure form, this composite drill bit, the gear wheel stable working, the drill bit good operating stability, when relatively existing composite drill bit has higher efficiency of breaking rock, also have the life-span of longer drill teeth and bearing, thereby have longer drilling life of bit.

The object of the invention realizes by following technical proposals:

A kind of wide tooth roller composite drill bit, comprise bit body, stationary cutting structure and at least one gear wheel, described gear wheel and described stationary cutting structure are arranged on described bit body, be provided with fixedly cutting teeth on described stationary cutting structure, described gear wheel forms by bearing arrangement and described bit body and is rotationally connected, it is characterized in that: inlaid solid on described gear wheel have a horizontal tooth of having a denture made, and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaid solid part of the horizontal tooth of having a denture made is non-circular.

The structure of tooth is one of key factor that affects roller bit cutting efficient.The tooth of insert bit and the perforation on gear wheel adopt interference fit (or welding-on etc.) mode to be inlaid solid on gear wheel usually.The bottom of tooth and cutter teeth hole formation interference fit (this part is called the inlaid solid part of tooth), the surface that tooth and perforation form interference fit is generally the face of cylinder; The top of tooth is positioned at outside the surface of cone shell, be used for directly contact, (this part is called the working portion of tooth to fractured rock, bizet or head also referred to as tooth), generally, radially (perpendicular to the tooth axis direction, the diametric(al) of parallel tooth lower cylindrical) size of tooth bizet is less than the body diameter of inlaid solid part.The size of the inlaid solid part of tooth (diameter and height) and the magnitude of interference are the keys that determines permanent tooth intensity, and the shape and size of tooth bizet are the keys that determines the tooth service behaviour.Usually so-called " flute profile " or " profile of tooth " classification with regard to referring to according to the feature of tooth corona shape and size, tooth be done.Common tooth flute profile (or profile of tooth) comprises hemi-spherical ended shape insert, conical tooth, chisel teeth, scoop chisel insert, eccentric scoop chisel insert, wedge crested chisel insert etc.According to the difference of tooth bizet geometrical body principal character, tooth can be divided into rotary type tooth and the large class of non-revolved body class tooth two.The bizet surface of rotary type tooth is the surface of revolution coaxial with tooth center line, as hemi-spherical ended shape insert and conical tooth.If the bizet of tooth surface is non-rotating curved surface, though or be its centre of gyration of surface of revolution and tooth center disalignment, such tooth is non-revolved body class tooth, as chisel teeth, scoop chisel insert, eccentric scoop chisel insert and wedge crested chisel insert etc.

The major parameter that characterizes tooth corona shape and size is that the proud exposure h of tooth, the addendum width W of tooth and the addendum thickness T(of tooth see Fig. 4).Proud exposure h refers to the height of tooth exposure outside the cone shell surface, is called for short proud exposure or tooth depth; The addendum width W of tooth refers to that the tooth top zone of tooth perpendicular to the maximum transverse size in the plane of tooth axis, is called for short addendum width; The thickness T of tooth refers to tooth tooth top zone in the maximum transverse size perpendicular to the tooth width direction, is called for short addendum thickness.Addendum width and addendum thickness have represented the lateral dimension at tooth top, and lateral dimension is less, and tooth is more sharp-pointed, more easily invade rock, but Strength Failure also more easily occurs simultaneously.With regard to regard to the impact of tooth efficiency of breaking rock, the width of tooth has more special meaning, reason is: although rock bit is mainly with the granulitization fractured rock, but the relative sliding motion of drill teeth when contacting with rock can make tooth produce and scrape the effect of cutting brokenly rock, at this moment, the width of tooth is larger, and it is just larger that area inswept when cutting is scraped in slippage, scrapes the effect of cutting broken rock also just more obvious.The tooth of insert bit is general many according to the tooth top width direction direction parallel with the gear wheel bus inlaid solid (as thetooth 5 in Fig. 5).Also can the slippage of first analyses and prediction tooth scrape the direction of cutting motion, then cut the inlaid solid tooth of the perpendicular or subvertical direction of the direction of motion (as thetooth 6 in Fig. 5) according to tooth top width with scraping.

Yet, particularity due to the tooth corona shape, the concept of tooth " tooth top zone " has certain ambiguity, thereby needs in addition concrete agreement, can be according to unified method tolerance addendum width and the purpose of addendum thickness to the tooth of various shapes to reach.For this reason, the spy does agree as follows: N is a natural number, vertically doing one perpendicular to the plane P (see figure 4) of tooth axis apart from the position of tooth bizet peak h/N, the N that is tooth by this plane to the zone between tooth bizet peak on tooth divides tooth top regional.Within the N of tooth divides the tooth top zone, perpendicular to the maximum transverse size of tooth axis, for the N of tooth divides addendum width (also namely: the N of tooth divides the Breadth Maximum of tooth top zone projection on plane P); Maximum transverse size corresponding direction on the P plane is tooth top facewidth direction; This tooth top zone is perpendicular to the maximum transverse size on the addendum width direction, for the N of tooth divides addendum thickness.In Fig. 4,4 minutes tooth top zones (zone between the peak of P plane to tooth top) of chisel teeth, 4 minutes addendum width W, addendum width direction and 4 minutes addendum thickness T have been indicated.Generally, the shape of tooth bizet is all more and more sharp-pointed to the top by root, so the tooth cross-sectional width/thickness on plane P divides addendum width/thickness with regard to the N that equals tooth.By definition as can be known, the difference of addendum width and addendum thickness is only just meaningful to non-revolved body class tooth.

The tooth top deflection angle refers to addendum line (the addendum width direction that is parallel to tooth, center by tooth top peak or highest region territory, and with the perpendicular straightway of tooth axis) with the angle of the wheel cone nut line of the tooth place gear wheel bus of tooth axes intersect (on the wheel conical surface with) (as Fig. 5, angle α shown in Figure 6), refer generally to addendum line and acute angle or the right angle of taking turns the cone nut line and becoming.Stipulate in this manual: from tooth top along the tooth axis direction to cone body, be positive deflection during the counterclockwise deflection of wheel cone nut line of the relative gear wheel of addendum line, otherwise turn for negative bias.The tooth top zero deflection (being that the tooth top deflection angle is 0 °) of the cutting teeth on existing most of cone bit cones, or have the tooth tooth top of the part gear ring of a small amount of drill bit that deflection is arranged, deflection angle is generally in 50 °.

For ease of setting forth, define in this manual: the tooth top deflection angle of tooth can be described as the horizontal tooth of having a denture made during greater than 50 °.The span of the tooth top angle of deflection of the horizontal tooth of having a denture made of the present invention be 70 °≤| α |≤90 °, the horizontal tooth of having a denture made is non-revolved body class tooth.

The skew of gear wheel refers to: the pole axis face of gear wheel (cross the gear wheel axis and be parallel to the plane of drill axis) is the offset distance of center line of bit relatively.As shown in Figure 7, for along drill bit drilling direction (along drill axis from the drill bit end of thread to the gear wheel end) when seeing, bit cone is perpendicular to the perspective view on the plane of drill axis, is the drill bit deviant apart from S in figure between the axis projection of gear wheel and bit central.

Adopt the horizontal tooth of having a denture made on the gear wheel of wide tooth roller composite drill bit, and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made is between 70 °～90 ° or-90 °～-70 °, make with on gear ring and the interval, space of adjacent inserted of the horizontal tooth of having a denture made and greatly reduce, reduced the discontinuity of gear ring, and less with the interdental space of adjacent horizontal edge on gear ring.The cross-sectional outling of the inlaid solid part of the horizontal tooth of having a denture made is non-circular.Laterally (vertical tooth short transverse) maximum size of the horizontal inlaid solid part of tooth of having a denture made is the length of inlaid solid part, and the maximum transverse size of vertical length direction is the width (as Figure 16, L1 is the length of inlaid solid part, and W1 is the width of inlaid solid part) of inlaid solid part.The cross-sectional outling of the inlaid solid part of this kind is non-circular tooth, the tooth top width of its top exposure part can design very longly along the length direction of the inlaid solid part in bottom, tooth top width can obviously be longer than conventional tooth, and the length of the inlaid solid part in bottom can be the lengthening that adapts to tooth top width and lengthens.Be that inlaid solid part cross section is non-circularly to provide convenience and condition for the long tooth top width of tooth.For each horizontal tooth of having a denture made, and a plurality of associatings of the horizontal tooth of having a denture made continuously, it is the rolling of approximate pure rolling, splitting in the mode of operation in shaft bottom, utilize the horizontal tooth of having a denture made to come fractured rock to the large contact stress of rock and extruding, namely to press stone roller, the broken rock of splitting near the mode of static pressure, broken rock mode and common rock bit have obvious difference.

Compared with prior art, its beneficial effect is:

(1) composite drill bit of the present invention, it has proposed a kind of new cone structure form, the wide tooth roller of this form of structure is broken through prior art to all inertial thinkings of insert bit, adopt the horizontal tooth of having a denture made, utilize horizontal on the gear wheel tooth of having a denture made to come brokenly rock to the rolling of rock, splitting, from the broken rock mode of impact crushing of conventional rock bit, the different of essence are arranged.When the addendum line of the horizontal tooth of having a denture made perpendicular to or when approaching perpendicular to the gear wheel bus, the time in tooth contact shaft bottom is obviously elongated, gear wheel is because vertically (be drill bit shaft to) vibration that tooth alternately produces obviously dies down, for each horizontal tooth of having a denture made, utilize the horizontal tooth of having a denture made to come fractured rock to the large contact stress of rock and extruding, thereby realize pressing the purpose of stone roller, the broken rock of splitting near the mode of static pressure, particularly the efficiency of breaking rock of brittle rock is high firmly to hard rock.Further, the cross-sectional outling of the inlaid solid part in bottom of the horizontal tooth of having a denture made is non-circular, the inlaid solid part in bottom can lengthen along the addendum width direction thus, to adapt to the increase of addendum width, improve addendum width and increase the stressed of the inlaid solid part of rear lower, can improve the inlaid solid reliability between tooth and gear wheel perforation, be convenient to the increase of addendum width.Adopt the horizontal tooth of having a denture made, less with the space between adjacent teeth on gear ring, and then the horizontal tooth formation of having a denture made of longer tooth top connects rotund fluted disc one by one, more be conducive to aforementionedly pressing the realization of the broken rock purpose of stone roller, splitting near the mode of static pressure, the cross-sectional outling of the inlaid solid part in aforementioned bottom further provides the more basis of advantage for the realization of this purpose for non-circular.And, because gear wheel of the present invention acts on rock with the rolling of approximate pure rolling, splitting mode, the gear wheel stable working, gear wheel is because the extensional vibration that tooth alternately produces obviously dies down, drill vibration is little, be conducive to improve the life-span of bearing, the static strength that reduces tooth lost efficacy and the fatigue strength inefficacy, extended the life-span of gear wheel part; While gear wheel stable working, drill vibration is little, make thus the working condition of the fixedly cutting teeth compound with it be better than the fixedly cutting teeth operating mode of existing gear wheel-PDC composite drill bit, both being conducive to fixedly stable the scraping of PDC tooth cuts, improve efficiency of breaking rock, can reduce again the fixedly impact failure of PDC tooth, extend the life-span of stationary cutting structure.Gear wheel tooth of the present invention, bearing and fixedly will all be extended the application life of cutting teeth, make the drill bit bulk life time obviously be better than having gear wheel-PDC composite drill bit now thus, and drill bit good stability when creeping into, and drilling efficiency is higher.As mentioned above, this scheme is being broken the prior art inertial thinking, when proposing above-mentioned innovative thinking, compare existing composite drill bit, both made gear wheel partly obtain better working effect, simultaneously solved again existing composite drill bit because of the compound adverse effect to stationary cutting structure that causes, obtained unforeseeable 1+1〉2 effect.

(2) gear wheel of the present invention is pressed stone roller, the broken rock of splitting in the mode of approximate static pressure, the circular ring type zone of fracture that roll on bottom rock, splitting goes out a circle circle, the gear wheel gear ring acts on rock with great contact stress, not only breaking tank be can form, also can damaged crackle and running crack do not rolled out on fragmented rock at bottom and the periphery of breaking tank.Established breaking tank and crackle make the fixedly cutting teeth on stationary cutting structure be easier to the wedging bottom rock and scrape cut brokenly rock, have further promoted the rock breaking capacity of stationary cutting structure.Gear wheel of the present invention rolls, scraping of the broken rock mode of splitting and stationary cutting structure cut brokenly the rock mode and combined and can obviously improve the efficiency of breaking rock of drill bit.

(3) the tooth addendum line of the horizontal tooth of having a denture made on gear wheel of the present invention perpendicular to or approach perpendicular to the gear wheel bus, thereby can realize rolling, in the splitting fractured rock, significantly reduce tooth with respect to the slippage of bottom rock.The mutual effect mode of tooth of the present invention and rock and rock breaking mechanism are compared with conventional rock bit obvious change have been occured, its brand-new cloth tooth mode, profile of tooth and broken rock mode, having reduced tooth on the gear wheel scrapes the impact of rock and slippage and cuts, can obviously improve stressing conditions and the wearing and tearing of tooth, improve the life-span of tooth, be particularly suitable for creeping at the strong hard formation of abrasiveness.

(4) gear wheel stable working of the present invention, dynamic load when having reduced the interaction of drill teeth and rock, the load that is subjected to when during the tooth fractured rock, the suffered common rock bit tooth of load ratio breaks rock is steady, is conducive to strengthen the inlaid solid reliability of tooth, reduces inserted dropping and rupture.

As preferably, 4 minutes addendum widths of the described horizontal tooth of having a denture made are not less than the width of the inlaid solid part of tooth.

In such scheme, 4 minutes addendum widths of the horizontal tooth of having a denture made are not less than the width of the inlaid solid part of tooth, make with the interval, space of adjacent inserted on gear ring and greatly reduce, reduced the discontinuity of gear ring, realize that the gear ring tooth is well with the mode fractured rock of rolling compaction, splitting, the composite drill bit good operating stability, above-mentioned beneficial effect is better.

As preferably, be provided with the dentation straight burr bar (being called for short the bar tooth) that is parallel to the tooth axis on the cylinder of the inlaid solid part of the described horizontal tooth of having a denture made, and the horizontal tooth of having a denture made embeds the mode of cutter teeth hole wall by the dentation vertical bar on inlaid solid part cylinder, or the interference fit of dentation vertical bar and cutter teeth hole formation Multi-point contact type is inlaid solid in the perforation of gear wheel.

As Figure 20, be provided with a plurality of bar teeth that are parallel to the tooth axis on the cylinder of the inlaid solid part in bottom of the horizontal tooth of having a denture made, be distributed in the bar tooth indentation on inlaid solid part cylinder, similar to the gear teeth of spur gear.When being provided with the bar tooth on the cylinder of the inlaid solid part of tooth, the cross-sectional outling of inlaid solid part refers to the profile by the formed envelope in summit of each tooth.The shape of the cross-sectional outling of the inlaid solid part of tooth is similar to the cutter teeth hole shape, but radial dimension is greater than the radial dimension of gear wheel perforation.(particularly when bar tooth top section is more sharp-pointed), be pressed in the process of gear wheel perforation at tooth when the deviation of both radial dimensions is larger, and the bar tooth can embed or invade the hole wall of perforation, thereby realizes the inlaid solid of tooth; When the deviation of both radial dimensions hour (particularly when bar tooth top section is more blunt), be pressed in the process of gear wheel perforation at tooth, the interference fit of the top of each tooth and the hole wall of perforation formation Multi-point contact type so also can realize the inlaid solid of tooth.The inlaid solid part in tooth bottom on existing insert bit gear wheel is cylindrical, it is inlaid solid on gear wheel that tooth contacts interference fit by face, value of interference fit between tooth and gear wheel perforation requires very high, and the magnitude of interference determines inlaid solid intensity and the reliability of tooth.The magnitude of interference too senior general causes that the cutter teeth bore deformation is excessive, easily causes gear wheel perforation cracking, affects permanent tooth intensity, permanent tooth reliability and cone shell intensity; The magnitude of interference is too little, the permanent tooth insufficient strength, and tooth is inlaid solid not firm, and reliability is low.Therefore, this inlaid solid mode is all higher to the crudies such as dimensional accuracy, tolerance and the surface roughness requirement of perforation and tooth cylinder, and for ease of processing and guarantee inlaid solid quality, general interference fit all adopts cylindrical, and tooth all need carry out fine grinding.For ease of increasing addendum width, the cross-sectional outling of the inlaid solid part in bottom of the horizontal tooth of having a denture made of the present invention is non-circular, for guaranteeing to inlay reliability and inlay quality, the cylinder of the inlaid solid part of tooth is provided with the bar tooth, adopts the mode of embedding or Multi-contact interference fit inlaid solid in the perforation of gear wheel.Adopt this mode permanent tooth, the tolerance of the radial dimension to tooth and perforation poor (magnitude of interference), the accuracy of form and position and surface quality obviously increases, can greatly reduce the crudy requirement such as processing dimension (precision, tolerance) requirement, surface roughness of tooth and perforation, be easy to realize the non-circular column manufacturing of tooth moulding, also can guarantee inlaying reliability and inlaying quality of tooth simultaneously.

As further preferred, the span of the tooth top angle of deflection of the horizontal tooth of having a denture made on described gear wheel be 80 °≤| α |≤90 °.

The span of the tooth top angle of deflection of the horizontal tooth of having a denture made be 80 °≤| α |≤90 °, can make on gear ring the interval, space between adjacent teeth less, reduce the discontinuity of gear ring, the tooth top profile of gear ring is closer to circle, the composite drill bit good operating stability, above-mentioned beneficial effect is better.

As preferably, 4 minutes addendum widths of the described horizontal tooth of having a denture made are more than or equal to the length of inlaid solid part.

In such scheme, when addendum width W equals thelength L 1 of inlaid solid part, be convenient to the fine finishining of exterior of teeth, be easy to the control to the magnitude of interference between tooth and gear wheel perforation during the manufacturing; Be convenient to control the processing dimension of tooth and the inlaid solid quality of tooth.In such scheme, addendum width W greater than thelength L 1 of inlaid solid part, further breaks through the inertial thinking of the sharp-pointed form of prior art tooth, forms a up big and down small similar mushroom.Larger addendum width can obviously reduce the interval, space of gear ring adjacent teeth and the discontinuity of gear ring, the tooth top profile of gear ring is closer to circle, the tooth of being more convenient on gear wheel acts on rock with rolling compaction, splitting mode, is easy to reach the effect of pressing stone roller, the broken rock of splitting in the static pressure mode.The horizontal tooth of having a denture made of this structure can not increase inlaid solid portion size, cutter teeth hole dimension, reach the prerequisite that does not reduce the spacing between the gear wheel perforation and be issued to the purpose that increases addendum width, it has also guaranteed the intensity of cone shell when having guaranteed the inlaid solid reliability of tooth.The horizontal tooth of having a denture made of this structure has numerous form of structure, and several better structures are wherein arranged: the horizontal tooth of having a denture made of this structure of the present invention a kind of, and through step transition, the step surface edge contour be circle to the inlaid solid part in the bottom of the horizontal tooth of having a denture made with top exposure part; The horizontal tooth of having a denture made of this structure of the present invention a kind of, through step transition, the step surface edge contour is key shape to the inlaid solid part in the bottom of the horizontal tooth of having a denture made with top exposure part.The inlaid solid part in this bottom and top exposure part is through the horizontal tooth of having a denture made of step transition, and its step surface can be sat on the aperture face that is pressed in the gear wheel perforation, and the axial compression when making tooth work is born by perforation aperture face, is no longer born by the low cone shell of perforation.Like this, the load that acts on cone shell during tooth work will be improved greatly, can obviously improve the load distribution consistency degree of cone body and the reliability and safety of housing; Or, the thickness between at the bottom of can reducing gear wheel perforation hole and gear wheel inner bearing hole, thus the size in gear wheel inner bearing hole increased, namely increase the size of gear wheel inner bearing, improve intensity and the application life of gear wheel bearing, and then extend drilling life of bit.

As preferably, the arc that the tooth top of the described horizontal tooth of having a denture made raises up for the axis direction along tooth.

In such scheme, when the tooth top of the horizontal tooth of having a denture made adopts arc, the more approaching circle of gear ring (profile) that the tooth top of the horizontal tooth of having a denture made on same gear ring forms, be conducive to the smooth working of gear wheel, reduce the shock loading of tooth, the load fluctuation when reducing gear wheel work is conducive to gear ring and gear wheel and presses stone roller, the broken rock of splitting in the static pressure mode, be conducive to improve the life-span of bearing and tooth, and improve the composite drill bit job stability.

As preferably, the tooth top of the described horizontal tooth of having a denture made is along the outline line of the tooth top width direction circular arc that is projected as along the axis direction of tooth.

In such scheme, due to the tooth axis on the gear wheel gear ring often with gear wheel axis out of plumb, particularly axis and the gear wheel axis angle near the gear ring tooth of gear wheel tip is less, when the gear ring girth is less, when on gear ring, the number of teeth was less, gear ring circularity was relatively poor.Be circular arc with the profile of the tooth top width direction of the horizontal tooth of having a denture made along the Projection Design of the axis direction of tooth, can improve the circularity of gear ring, make gear ring (profile) closer to circle, be conducive to the smooth working of gear wheel, reduce the shock loading of tooth, the load fluctuation when reducing gear wheel work is conducive to the gear wheel gear ring and presses stone roller, the broken rock of splitting in the static pressure mode, be conducive to improve the life-span of bearing and tooth, and improve the composite drill bit job stability.

As preferably, all or part of interlaced arrangement of the horizontal tooth of having a denture made of different gear rings on described gear wheel.

In such scheme, gear wheel is the rotating cone body, when gear wheel rolls broken rock in the shaft bottom, tooth on each gear ring is changed to another from a scroll wheel, the horizontal tooth interlaced arrangement of having a denture made of different gear rings, tooth on different gear rings can make up the gear ring out-of-roundness of gear ring because causing with space, inserted interval of gear ring mutually, make gear wheel work more steady, reduce the shock loading of tooth, load fluctuation when reducing gear wheel work, be conducive to the gear wheel gear ring and press stone roller, the broken rock of splitting, the life-span that is conducive to improve bearing and tooth in the static pressure mode.And, the gear wheel top rail have a denture made tooth addendum line perpendicular to or approach perpendicular to the gear wheel bus, the time in tooth contact shaft bottom is obviously elongated, gear wheel is because the extensional vibration that tooth alternately produces obviously dies down, particularly have a denture made tooth on the gear wheel circumferencial direction during layout interlaced with each other when horizontal on two gear rings, the extensional vibration of gear wheel is more weak, the gear wheel stable working, extensional vibration is little, be conducive to improve the life-span of bearing, the static strength that reduces tooth lost efficacy and the fatigue strength inefficacy, and improved the composite drill bit job stability.

As preferably, the tooth top two ends of the described horizontal tooth of having a denture made (along the two ends of tooth top width) are provided with rounding or chamfering.

In such scheme, the tooth top two ends of the horizontal tooth of having a denture made are as establishing rounding or chamfering transition, and tooth top two ends will be wedge angle, and during the broken rock of tooth and rock effect, sharp corner easily forms stress and concentrates, and easily makes tooth top end fatigue damage or local fracture.Rounding or chamfering are established in the tooth top two ends, and the stress distribution that can effectively improve the tooth top end reduces stress to be concentrated, and extend tooth application life.

As preferably, the fixedly cutting teeth on the gear ring on described gear wheel and described stationary cutting structure is radially arranged with rail.

Refer to that with rail the radial position of cutting teeth on drill bit is identical, namely equate apart from the drill axis distance.Gear wheel gear ring and when fixedly cutting teeth is radially arranged with rail, the tooth on gear ring and fixing cutting teeth broken rock of effect in turn on the same annular region in shaft bottom.Bottom rock by the tooth on gear wheel roll, after splitting, roll, on breaking tank that splitting goes out fixedly cutting teeth scrape again and cut, cutting teeth is conducive to the fixedly wedging of cutting teeth with rail cloth tooth, is convenient to improve the efficiency of breaking rock of drill bit.

As preferably, 4 minutes addendum thicknesses of the horizontal tooth of having a denture made on described gear wheel are not more than 1/4th of the inlaid solid partial width of tooth.

4 minutes addendum thicknesses of the horizontal tooth of having a denture made are not more than 1/4th of the inlaid solid partial width of tooth, the addendum thickness that is the horizontal tooth of having a denture made is less, under this threshold, when more being conducive to the tooth rolling compaction to the extruding slabbing action of rock, improve the efficiency of breaking rock of bit cone, particularly to the high rigidity bad ground, rock breaking efficiency is better, thereby improves the efficiency of breaking rock of composite drill bit.

As preferably, the deviant of each gear wheel on described bit body is not more than 1.5% of bit diameter.

The deviant of the gear wheel under this threshold makes gear ring and gear wheel with pure rolling or more near the form rolling work of pure rolling, more is conducive to gear ring and gear wheel with the mode fractured rock of rolling compaction, splitting; Simultaneously, the slippage that can also reduce the gear wheel upper teeth is scraped and is cut, and reduces the wearing and tearing of tooth, extends tooth application life.

The tooth addendum line of the horizontal tooth of having a denture made on gear wheel perpendicular to or approach perpendicular to the gear wheel bus, the deviant of gear wheel is very little simultaneously, is realizing rolling, in the splitting fractured rock, can also significantly reduce tooth with respect to the slippage of bottom rock.The mutual effect mode of the tooth on gear wheel of the present invention and rock and rock breaking mechanism are compared with conventional rock bit obvious change have been occured, its brand-new cloth tooth mode, profile of tooth and broken rock mode, having reduced tooth on the gear wheel scrapes the impact of rock and slippage and cuts, can obviously improve stressing conditions and the wearing and tearing of tooth, improve the life-span of tooth, be particularly suitable for creeping in hard formation and the strong hard formation of abrasiveness.

As preferably, the span of the tooth top angle of deflection of the described horizontal tooth of having a denture made be 85 °≤| α |≤90 °, and on bit body, the deviant of gear wheel is not more than 0.5% of bit diameter.

In theory, the have a denture made tooth top deflection angle of tooth of bit cone top rail is more less near 90 °, the deviant of gear wheel, and the continuity of gear ring is better, the tooth top profile of gear ring is more close to circle.On the combination threshold of each parameter of this scheme, be conducive to the smooth working of gear wheel most, reduce the shock loading of tooth, the load fluctuation when reducing gear wheel work improves the job stability of composite drill bit; Be conducive to most simultaneously the gear wheel gear ring and press stone roller, the broken rock of splitting in the static pressure mode, efficiency of breaking rock is the highest, and significantly improves the life-span of bearing and tooth, and the composite drill bit efficiency of breaking rock is high.

More preferably, the tooth top angle of deflection of the described horizontal tooth of having a denture made=90 °, and on drill bit, gear wheel is not offset (deviant is 0).

Constant at other geometric parameters of drill bit, when tooth size was also constant, tooth top angle of deflection=90 ° can make the between cog space minimum, and the continuity of gear ring is best, and the tooth top profile of gear ring is close to circle; Gear wheel is not offset, and can make gear wheel pure rolling effect best.Tooth top angle of deflection=90 °, gear wheel are not offset, be realize gear ring and gear wheel with pure rolling (or near pure rolling) roll, the extremely excellent parameter of splitting fractured rock, the drill bit efficiency of breaking rock is high.

As preferably, the described horizontal tooth of having a denture made is inner sunken face along two sides on the addendum thickness direction, and 4 minutes addendum widths of tooth are not less than the inlaid solid partial width of tooth, 4 minutes addendum thicknesses are not more than 1/4th of the inlaid solid partial width of tooth.

The gear wheel tooth is inner sunken face along two sides on the thick direction of tooth top, less at vertical (along the tooth axis direction) upper teeth addendum thickness, down the increase of transverse tooth thickness is slow from tooth top, and it is conducive to tooth and rolls, is pressed into rock, and is conducive to tooth and is pressed into rear extruding slabbing action to rock; And it is conducive to the increase that tooth slows down the tooth addendum thickness in when wearing and tearing, and the tooth top that makes the gear wheel tooth continue to keep less is thick, extends the gear wheel tooth to being pressed into of rock, extruding, splitting crushing effect.

As preferably, the profile of the cross section of the inlaid solid part in bottom of the described horizontal tooth of having a denture made is formed by both sides circular arc middle straight segment link, is key shape.

As preferably, the profile of the cross section of the wide inserted inlaid solid part in bottom of described abnormal shape is to be formed by connecting by arc section in the middle of the circular arc of two ends.

In above-mentioned two schemes, the profile of the cross section of the inlaid solid part in bottom of the horizontal tooth of having a denture made is formed by both sides circular arc middle straight segment link, is key shape; Or the profile of the cross section of the special-shaped wide inserted inlaid solid part in bottom is when being formed by connecting by arc section in the middle of the circular arc of two ends.The cylinder of these two kinds of profiles is low than the cylinder difficulty of processing of other non-circular profiles, adds easy operating and realization in man-hour, good manufacturability.Their corresponding perforations also are easy to Milling Process, and processing technology is good.

Description of drawings

Fig. 1 is the structural representation of the wide tooth roller composite drill bit of the present invention.In figure, two fixed-wing stationary cutting structures and two gear wheels are set on composite drill bit, two fixed-wings layout alternate with two gear wheels.

The view of Fig. 2 when to be the present invention's structure shown in Figure 1 overlook (contrary drill bit drilling direction is seen) along drill axis, i.e. top view.

Fig. 3 is the tooth gear ring of gear wheel of the wide tooth roller composite drill bit of the present invention and the schematic diagram that the fixedly cutting teeth on stationary cutting structure radially covers along drill bit.

Fig. 4 is 4 minutes addendum width W of tooth and thickness T (take chisel teeth as example) schematic diagram.

Inlaid solid or tooth top has schematic diagram when inlaid solid than small deflection angle (| α |＜50 °) to Fig. 5 for the inserted tooth top zero deflection on existing rock bit.

Fig. 6 be the span of wheel cone nut wire clamp angle (tooth top deflection angle) α of the addendum line of the horizontal tooth of having a denture made of the present invention and gear wheel be 70 °≤| α | the schematic diagram when＜90 ° or α=90 °.

Fig. 7 is the schematic diagram in gear wheel when skew on drill bit.

Fig. 8 is certain gear wheel of the present invention's structure drill bit shown in Figure 1 schematic diagram when seeing at the bottom of the gear wheel along the gear wheel axis from the gear wheel tip.

Fig. 9 is the drill bit top view when on wide tooth roller composite drill bit, three fixed-wing stationary cutting structures and three gear wheels being set.Equal alternate layout between fixed-wing and gear wheel.

Figure 10 is that the horizontal tooth of having a denture made of the present invention is inlaid solid after the non-circular perforation of gear wheel, the partial sectional view when vertical tooth axis dissects.

Figure 11 is the schematic diagram of profile (and gear wheel perforation cross-sectional profiles) when being formed by connecting by arc section in the middle of the circular arc of two ends of cross section of the inlaid solid part of the horizontal tooth of having a denture made of the present invention.

Figure 12 is the inlaid solid partial-length L1 that the horizontal 4 minutes addendum width W of tooth that have a denture made of the present invention equal tooth, but the horizontal toothing schematic diagram of having a denture made during greater than inlaid solid partial width W1.

Figure 13 is the schematic diagram of the horizontal tooth of having a denture made shown in Figure 12 when seeing at the bottom of the tooth along the tooth axis from the tooth top.

Figure 14 is that the horizontal tooth of having a denture made shown in Figure 12 is inlaid solid after the gear wheel perforation, the partial sectional view when dissecing along the tooth axis.

Figure 15 is a kind of of the horizontal tooth of having a denture made of mushroom of the present invention, and the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part is through step transition, the horizontal tooth schematic diagram of having a denture made when the step surface profile is key shape.

Figure 16 is the schematic diagram of the horizontal tooth of having a denture made shown in Figure 15 when seeing at the bottom of the tooth along the tooth axis from the tooth top.

Figure 17 is a kind of of the horizontal tooth of having a denture made of mushroom of the present invention, and the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part is through step transition, horizontal the have a denture made tooth schematic diagram of step surface profile when circular.

Figure 18 is the schematic diagram of the horizontal tooth of having a denture made shown in Figure 17 when seeing at the bottom of the tooth along the tooth axis from the tooth top.

Figure 19 is that the horizontal tooth of having a denture made of Figure 15 or mushroom shown in Figure 17 is inlaid solid after the non-circular perforation of gear wheel, the partial sectional view when dissecing along the tooth axis.

Figure 20 adopts the horizontal tooth of having a denture made that is provided with the dentation vertical bar (being called for short the bar tooth) that is parallel to the tooth axis on the cylinder of inlaid solid part on gear wheel of the present invention, before the horizontal tooth of having a denture made was not pressed in perforation on gear wheel, perforation profile size was in the tooth top profile of the inlaid solid part bar of the horizontal tooth of having a denture made tooth and the schematic diagram between the concave bottom profile.

Figure 21 adopts the horizontal tooth of having a denture made that is provided with the bar tooth of the axis that is parallel to tooth on the cylinder of inlaid solid part on gear wheel of the present invention, the horizontal tooth of having a denture made is inlaid solid after the non-circular perforation of gear wheel, the partial sectional view when vertical tooth axis dissects.

Figure 22 is provided with the bar tooth that is parallel to the tooth axis on the cylinder of the horizontal inlaid solid part of tooth of having a denture made of the present invention, and the horizontal tooth addendum width of having a denture made equals the inlaid solid partial-length of tooth but the horizontal toothing schematic diagram of having a denture made during greater than inlaid solid partial width.

Figure 23 is that the horizontal tooth of having a denture made shown in Figure 22 is inlaid solid after the gear wheel perforation, the partial sectional view when dissecing along the tooth axis.

Figure 24 is a kind of of the horizontal tooth of having a denture made of mushroom of the present invention, be provided with the bar tooth that is parallel to the tooth axis on the cylinder of the horizontal inlaid solid part of tooth of having a denture made, the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part is through step transition, the step surface profile is key shape, horizontal the have a denture made tooth schematic diagram of addendum width during greater than the inlaid solid partial-length in bottom.

Figure 25 is a kind of of the horizontal tooth of having a denture made of mushroom of the present invention, be provided with the bar tooth that is parallel to the tooth axis on the cylinder of the horizontal inlaid solid part of tooth of having a denture made, the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part is through step transition, the step surface profile is circular, horizontal the have a denture made tooth schematic diagram of addendum width during greater than the inlaid solid partial-length in bottom.

Figure 26 is that Figure 24 or the horizontal tooth of having a denture made shown in Figure 25 are inlaid solid after the gear wheel perforation, the partial sectional view when dissecing along the tooth axis.

Figure 27 is that the horizontal tooth of having a denture made embeds the inlaid solid schematic diagram in the gear wheel perforation of mode of cutter teeth hole wall with the bar tooth.

Figure 28 is the horizontal interference fit inlaid solid schematic diagram in gear wheel perforation in of tooth with bar tooth and cutter teeth hole formation Multi-point contact type of having a denture made.

Figure 29 is that the horizontal tooth of having a denture made of the present invention is inner sunken face along two sides on the addendum thickness direction, the tooth schematic diagram when seeing along tooth addendum width direction.

Figure 30 adopts Figure 15 or the horizontal drill bit top view of having a denture made during tooth of mushroom shown in Figure 24 on the gear wheel of the wide tooth roller composite drill bit of the present invention.

Figure 31 be the horizontal tooth of having a denture made of the present invention tooth top along the outline line of addendum line direction along the axis direction of tooth be projected as circular arc the time structural representation.

Figure 32 is the schematic diagram of the horizontal tooth of having a denture made of structure shown in Figure 31 when seeing at the bottom of the tooth along the tooth axis from the tooth top.

The specific embodiment

Following non-limiting examples is used for explanation the present invention.

As extremely shown in Figure 32 in Fig. 1, basic example is:comprise bit body 1,stationary cutting structure 4 and at least onegear wheel 2,gear wheel 2 andstationary cutting structure 4 are arranged onbit body 1, be provided with fixedly cuttingteeth 41 onstationary cutting structure 4, gear wheel forms by bearing arrangement andbit body 1 and is rotationally connected, inlaid solid ongear wheel 2 have thehorizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of thehorizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaidsolid part 31 of thehorizontal tooth 3 of having a denture made is non-circular.As preferably, the hard-metal insert that thehorizontal tooth 3 of having a denture made can be strengthened for hard-metal insert, with diamond, impregnated with diamond tooth etc.

The horizontal tooth of having a denture made of each of the present invention program all can be realized its effect, for the ease of example, all adopt the composite drill bit of modal pair of gear wheel+two fixed-wings or the composite drill bit of three gear wheels+three fixed-wings in each figure, each gear ring of each gear wheel is the horizontal tooth of having a denture made, it does not represent and the conflicting of basic example and other preferences, be only example directly perceived, there is not disturbance of understanding in those skilled in the art.

Preferred one as basic example, 4 minutes addendum width W of thehorizontal tooth 3 of having a denture made are not less than thewidth W 1 of the inlaidsolid part 31 of tooth.

As preferred one more preferably, have at least on 1 gear ring at least one gear wheel 2 on bit body 1, the ratio that horizontal tooth 3 numbers of having a denture made account for place gear ring tooth number is at least 50%.Further preferred, have at least 1 gear ring all to adopt the horizontal tooth 3 of having a denture made at least one gear wheel 2 of bit body 1, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; As further preferred, each gear wheel on bit body 1 has at least 1 gear ring to adopt the horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °.As more preferably, each gear wheel on bit body 1 has at least 1 gear ring to adopt 4 minutes addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width W 1 of inlaid solid 31 of tooth, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °.As further preferred, each gear wheel on bit body 1 has at least 1 gear ring to adopt 4 minutes addendum width W to be not less than the horizontal tooth 3 of having a denture made of inlaid solid part 31 width W 1 of tooth, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 80 °≤| α |≤90 °.More preferably, each gear wheel on bit body 1 has at least 1 gear ring to adopt 4 minutes addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width W 1 of the inlaid solid part 31 of tooth, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 80 °≤| α |≤90 °.As extremely shown in Figure 180 in Fig. 6, Fig. 9.

As preferred two, 4 minutes addendum width W of the horizontal tooth 3 of having a denture made are more than or equal to the length L 1 of inlaid solid part 31.More preferably, the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 80 °≤| α |≤90 °.4 minutes addendum width W of the horizontal tooth 3 of having a denture made equal the length of inlaid solid part, shown in Figure 12 to 14.4 minutes addendum width W of the horizontal tooth 3 of having a denture made form a up big and down small similar mushroom, as shown in Figure 15 to 19 greater than the length L 1 of inlaid solid part 31.Figure 15,16 is depicted as horizontal a kind of of tooth 3 that have a denture made of mushroom of the present invention, and through step transition, the step surface edge contour is key shape to the inlaid solid part 31 in the bottom of the horizontal tooth 3 of having a denture made with top exposure part.Figure 17,18 is depicted as horizontal a kind of of tooth 3 that have a denture made of mushroom of the present invention, and through step transition, the step surface edge contour is circular to the inlaid solid part 31 in the bottom of the horizontal tooth 3 of having a denture made with top exposure part.

As preferred three, the arc that the tooth top of thehorizontal tooth 3 of having a denture made raises up for the axis direction along tooth, as shown in Figure 14,19, the tooth top of thehorizontal tooth 3 of having a denture made is circular-arc.

As preferred four, the tooth top of thehorizontal tooth 3 of having a denture made is along the outline line of the tooth top width direction circular arc that is projected as along the axis direction of tooth, and as shown in Figure 30,31, it can improve the circularity of gear ring.

As preferred five, the horizontal all or part of interlaced arrangement oftooth 3 of having a denture made of the different gear rings on gear wheel 2.Different gear rings can the number of teeth equate, the horizontal between cog of having a denture made of each of different gear rings is all staggered; But the number of teeth does not wait yet, and outer ring as relative in inner ring is every 2 teeth or more multiple tooth staggered, perhaps 1, interval and a plurality of promiscuous mode etc.As shown in Figure 8, first and second ongear wheel 2 row (by the first row that is of gear wheel bottom surface) gear ring horizontal have a denture madetooth 3 gear wheel wheel cone week upwards mutual dislocation arrange.

As preferred six, the tooth top two ends of thehorizontal tooth 3 of having a denture made (along the two ends of tooth top width) are provided with rounding or chamfering, as shown in Figure 14,19.

As preferred seven, be provided with the dentation vertical bar (being called for short the bar tooth) (as Figure 22,24,25) that is parallel to the tooth axis on the cylinder of the inlaid solid part of the describedhorizontal tooth 3 of having a denture made, and thehorizontal tooth 3 of having a denture made embeds the mode (as Figure 21,27) of cutter teeth hole wall by the bar tooth on inlaidsolid part 31 cylinders, or the mode of the interference fit of bar tooth and cutter teeth hole formation Multi-point contact type is inlaid solid in the perforation of gear wheel 2 (as Figure 28).At this moment, the length of inlaid solid part or width calculate according to the bar tooth protruding top profile of its cross section, and as shown in figure 20, the length of inlaid solid part or width are profile zone that 311(surrounds, the protruding top of bar tooth) length or width.

As preferred eight, 4 minutes addendum widths of the describedhorizontal tooth 3 of having a denture made are more than or equal to thelength L 1 of inlaid solid part 31.As shown in 12,22,4 minutes addendum widths of thehorizontal tooth 3 of having a denture made equal thelength L 1 of inlaidsolid part 31; As shown in 15,17,24,25,4 minutes addendum widths of thehorizontal tooth 3 of having a denture made are greater than thelength L 1 of inlaidsolid part 31.

As preferred nine, the gear ring on describedgear wheel 2 and thefixedly cutting teeth 41 on describedstationary cutting structure 4 are radially arranged with rail.As shown in Figure 3, thegear ring 3a on gear wheel and fixedly cuttingteeth 41a radially arrange with rail.

As preferred ten, the profile of the cross section of the inlaidsolid part 31 in bottom of the describedhorizontal tooth 3 of having a denture made is formed by both sides circular arc middle straight segment link, as shown in Figure 10,13,16,18,21.Perhaps, as shown in figure 11, the profile of the cross section of the horizontal inlaidsolid part 31 oftooth 3 of having a denture made in figure (and cross-sectional profiles of gear wheel perforation) is formed by connecting by both sides circular arc middle circle segmental arc.

As more preferably A arbitrary in basic example and preferred to ten, the deviant of eachgear wheel 2 onbit body 1 is not more than 1.5% of bit diameter.

As more preferably B arbitrary in basic example and preferred to ten, 4 minutes addendum thicknesses of thehorizontal tooth 3 of having a denture made ongear wheel 2 are not more than 1/4th of inlaidsolid part 31 width of tooth, as shown in Figure 13,16,18.

Further preferred as more preferably A or B, has 50% the horizontal tooth 3 of having a denture made of gear ring employing on bit body 1 at least, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 85 °≤| α |≤90 °, and on bit body 1, the deviant of gear wheel 2 is not more than 0.5% of bit diameter.More preferably, has 50% the horizontal tooth 3 of having a denture made of gear ring employing on bit body 1 at least, and the tooth top angle of deflection of the horizontal tooth 3 of having a denture made=90 ° (addendum line that is the horizontal tooth 3 of having a denture made is vertical with the wheel cone nut line of gear wheel 2), and on bit body 1, gear wheel 2 is not offset (deviant is 0), as shown in Fig. 1,2,8,9,30.More preferably, the horizontal tooth 3 of having a denture made is inner sunken face (as Figure 29) along two sides on the addendum thickness direction, and 4 minutes addendum width W of tooth are not less than inlaid solid part 31 width W 1 of tooth, 4 minutes addendum thicknesses are not more than 1/4th of inlaid solid part 31 width W 1 of tooth.

What need special declaration is; above basic example and each be both preferably some embodiment of the present invention; also various optional enforcement means simultaneously; those skilled in the art as can be known; above-mentioned various optional enforcement means can be carried out various feasible independent assortments; can produce more embodiment thus, it all should be in protection scope of the present invention, and in order to support the protection of claim:

Such as, any combination between preferred to ten can become some embodiment; And even, preferred one more preferably (as, have at least 1 gear ring all to adopt the horizontal tooth 3 of having a denture made at least one gear wheel 2 on bit body 1, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Or each gear wheel 2 on bit body 1 has at least 1 gear ring to adopt the horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Or each gear wheel on bit body 1 has at least 1 gear ring to adopt 4 minutes addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width of the inlaid solid part 31 of tooth, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Etc.), also can and any combination between preferred two to ten, become more embodiment.Do not do more limit for example at this, those skilled in the art are other more combinations as can be known.

All any modifications of doing within the spirit and principles in the present invention, make up, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. one kind wide tooth roller composite drill bit, comprise bit body (1), stationary cutting structure (4) and at least one gear wheel (2), described gear wheel (2) and described stationary cutting structure (4) are arranged on described bit body (1), be provided with fixedly cutting teeth (41) on described stationary cutting structure (4), described gear wheel (2) forms by bearing arrangement and described bit body (1) and is rotationally connected, it is characterized in that: the upper inlaid solid horizontal tooth of having a denture made (3) that has of described gear wheel (2), and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made (3) be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaid solid part (31) of the horizontal tooth of having a denture made is non-circular.

2. wide tooth roller composite drill bit as claimed in claim 1, it is characterized in that: 4 minutes addendum widths of the described horizontal tooth of having a denture made (3) are not less than the width of the inlaid solid part of tooth (31).

3. wide tooth roller composite drill bit as claimed in claim 1, it is characterized in that: the dentation vertical bar that is provided with the axis that is parallel to tooth on the cylinder of the inlaid solid part (31) of the described horizontal tooth of having a denture made (3), and the horizontal tooth of having a denture made (3) embeds the mode of gear wheel (2) perforation wall by the dentation vertical bar on inlaid solid part (31) cylinder, or the interference fit of dentation vertical bar and gear wheel (2) perforation formation Multi-point contact type is inlaid solid in the perforation of gear wheel (2).

4. wide tooth roller composite drill bit as claimed in claim 1, it is characterized in that: the fixedly cutting teeth (41) on the gear ring on described gear wheel (2) and described stationary cutting structure (4) is radially arranged with rail.

5. wide tooth roller composite drill bit as claimed in claim 1, it is characterized in that: 4 minutes addendum widths of the described horizontal tooth of having a denture made (3) are more than or equal to the length of inlaid solid part (31).

6. wide tooth roller composite drill bit as claimed in claim 1, is characterized in that: all or part of interlaced arrangement of the horizontal tooth of having a denture made (3) of the different gear rings on described gear wheel (2).

7. the wide tooth roller composite drill bit described in arbitrary claim in claim 1 to 6, it is characterized in that: 4 minutes addendum thicknesses of the horizontal tooth of having a denture made (3) on described gear wheel (2) are not more than 1/4th of the inlaid solid part of tooth (31) width.

8. the wide tooth roller composite drill bit described in arbitrary claim in claim 1 to 6, it is characterized in that: the deviant of each gear wheel (2) on described bit body (1) is not more than 1.5% of bit diameter.

9. wide tooth roller composite drill bit as claimed in claim 7 or 8, it is characterized in that: the span of the tooth top angle of deflection of the described horizontal tooth of having a denture made (3) be 85 °≤| α |≤90 °, and the deviant of the upper gear wheel (2) of bit body (1) is not more than 0.5% of bit diameter.

10. wide tooth roller composite drill bit as claimed in claim 9, it is characterized in that: the described horizontal tooth of having a denture made (3) is inner sunken face along two sides on the addendum thickness direction, and 4 minutes addendum widths of tooth are not less than the inlaid solid part of tooth (31) width, 4 minutes addendum thicknesses are not more than 1/4th of the inlaid solid part of tooth (31) width.

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