Motor shaftTechnical field
A kind of the present invention relates to technical field of motors, more particularly to motor shaft.
Background technology
Motor shaft of the prior art, is arranged with bearing on motor shaft, the inner ring of bearing is coordinated with the side wall of motor shaft, axleThe two ends that holds are additionally provided with back-up ring, and motor shaft is metal shaft, if it is desired to bearing is set on motor shaft, is needed bearing from electricityThe end of arbor is set to centre position, therefore the diameter of bearing inner race can only be arranged to plus tolerance, and the diameter of motor shaft setsNegative common difference is set to, otherwise bearing is difficult to be set on motor shaft, and so, the fit clearance between motor shaft and bearing is larger,Motor shaft can produce no small bounce in rotation process, cause very big noise.
Content of the invention
The technical problem to be solved in the present invention is：In order to solve the problems referred to above that motor shaft of the prior art is present, thisInvention provides a kind of motor shaft to solve the above problems.
The technical solution adopted for the present invention to solve the technical problems is：A kind of motor shaft, closes including metal center axle, aluminiumGolden axle sleeve and injection molded layers, the inwall of the aluminium alloy axle sleeve are coordinated with the outer wall of the metal center axle, the aluminum alloy bearingIncluding Part I and two Part II, two Part II are located at the both sides of Part I, the Part IIExternal diameter of the external diameter less than Part I, the inwall of two injection molded layers are coordinated with the outer wall of the metal center axle, two institutesInjection molded layers are stated positioned at the both sides of the aluminium alloy axle sleeve, the external diameter of the injection molded layers is equal to the external diameter of the Part II.
Preferably, the injection molded layers by BMC or BMC be molded on the metal center axle intoType.
Preferably, the external diameter of the injection molded layers is 10 ~ 16mm, tolerance is -0.034 ~ -0.016 μm, the Part IIExternal diameter be 10 ~ 16mm, tolerance be 0.003 ~ 0.005 μm.
Preferably, a diameter of 9mm of the metal center axle, the internal diameter of the injection molded layers is 9mm, the Part II9mm is with the internal diameter of Part I.
Preferably, the outer wall of the metal center axle offers an annular groove at two ends respectively.
Specifically, the material of the metal center axle is steel.
The invention has the beneficial effects as follows, this motor shaft has been arranged aluminium alloy axle sleeve and injection molded layers on heart axle in a metal,Injection molded layers soft material, bearing are easier to reach at aluminium alloy axle sleeve through injection molded layers, and aluminium alloy axle sleeve is used for matching somebody with somebody with bearingThe Part II of conjunction is because shorter, though external diameter is the assembling that plus tolerance does not interfere with bearing yet, and the external diameter of Part IIThe difference and internal diameter of bearing between reduces, and makes the cooperation between bearing and Part II even closer, so as to motor shaft is turningReduce bounce during dynamic, reduce noise, extend the service life of motor shaft.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of the optimum embodiment of the motor shaft of the present invention.
1 in figure, metal center axle, 2, aluminium alloy axle sleeve, 3, injection molded layers, 4, annular groove, 201, Part I, 202,Two parts.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finishSame or similar label represents same or similar element or the element with same or like function.Below with reference to attachedThe embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.Conversely, thisInventive embodiment includes all changes, modification and the equivalent fallen in the range of the spirit and intension of attached claimsThing.
In describing the invention, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", " length ", " width "," thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " axial direction "," radially ", the orientation of the instruction such as " circumference " or position relationship are based on orientation shown in the drawings or position relationship, merely to justIn description the present invention and simplify description, rather than indicate or hint indication device or element must have specific orientation, withSpecific azimuth configuration and operation, are therefore not considered as limiting the invention.
Additionally, term " first ", " second " etc. are only used for describing purpose, and it is not intended that indicating or implying relatively importantProperty.In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " being connected ", " connection " answerIt is interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or is integrally connected；Can be that machinery connectsConnect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary.Common for this areaFor technical staff, above-mentioned term concrete meaning in the present invention can be understood with concrete condition.Additionally, in description of the inventionIn, unless otherwise stated, " multiple " are meant that two or more.
As shown in figure 1, the invention provides a kind of motor shaft, including metal center axle 1, aluminium alloy axle sleeve 2 and injection molded layers3, the material of metal center axle 1 is steel, and the inwall of aluminium alloy axle sleeve 2 is coordinated with the outer wall of metal center axle 1, aluminum alloy bearing bagThe Part I 201 and two Part II 202 of integrative-structure is included, two Part II 202 are located at the two of Part I 201Side, the external diameter of Part II 202 are less than the external diameter of Part I 201, and the inwall of two injection molded layers 3 is outer with metal center axle 1Wall coordinates, and two injection molded layers 3 are located at the both sides of aluminium alloy axle sleeve 2, and the external diameter of injection molded layers 3 is equal to the external diameter of Part II 202, noteModeling layer 3 is molded on metal center axle 1 by BMC or BMC and is molded, and the external diameter of injection molded layers 3 is 12mm, publicDifference is -0.034 ~ -0.016 μm, and the external diameter of Part II 202 is 12mm, and tolerance is 0.003 ~ 0.005 μm, metal center axle 1A diameter of 9mm, the internal diameter of injection molded layers 3 are 9mm, metal center axle for the internal diameter of 9mm, Part II 202 and Part I 2011 outer wall offers an annular groove 4 at two ends respectively.
This motor shaft, has been arranged aluminium alloy axle sleeve and injection molded layers on heart axle in a metal, bearing has been assembled to aluminium alloyWhen on axle sleeve, due to the soft material of injection molded layers, with certain elasticity, bearing easier reaches second through after injection molded layersPart, Part II are shorter, even if so its external diameter is set to plus tolerance, also can realize completely for bearing holder (housing, cover) being attached to secondOn part, and as the external diameter of Part II is plus tolerance, make it even closer with the cooperation of bearing inner race, reduce motor shaftThe bounce produced in rotation process, reduces noise.
Motor shaft of the prior art, bearing are directly assembled in metal shaft, as metal shaft can produce magnetic field, and bearingOuter ring also can produce magnetic field, cover bearing, then bearing cutting magnetic line in rotation process after the connection of two magnetic fields, it interiorMicro-current will be produced in the middle of circle and metal shaft, this will have a great impact for the service life of bearing；Slight transportsThe thousands of hours of row, serious even can only run a few houres, bring strong influence to site safety production；Simultaneously because bearingDamaging and change the directly or indirectly economic loss that brings also can not subtotal.And in the present invention, metal center axle and bearing itBetween be provided with non-magnetic aluminium alloy axle sleeve, the connection in magnetic field in metal shaft and Bearing outer magnetic field can be blocked, it is ensured that axleThe service life that holds.
Conventional motor shaft, the flat position of milling and annular knurl, raising metal shaft and load in metal shaft in order to be connected with loadFitness, but thus result in inconsistent with the axiality of metal shaft other parts at flat position, at annular knurl, motor shaft rotateDuring produce violent bounce, life-span that bearing and motor shaft can be affected using getting off, and noise can be increasing；And thisIn application, the soft material of injection molded layers, with certain elasticity, directly compressing injection molded layers deformation when load is assembled in injection molded layers,So as to reach close-fitting effect, and the axiality of whole motor shaft is not interfered with.
For fixing bearing on axle, conventional motor shaft needs to slot on the outer wall of metal shaft, for arranging back-up ring, byBearing is nestled up in the position of fluting, at the middle part of metal shaft, therefore can reduce the rigidity of metal shaft, if a metal shaftA diameter of 12mm, a diameter of 9mm of groove position, then the rigidity of this root metal shaft does not reach 12mm, is only equivalent to a diameter of 9mm'sRigidity, and in the application, the external diameter of Part I forms platform more than the external diameter of Part II between Part I and Part IIRank, bearing be assembled to backward step on Part II in the axial direction it can be carried out spacing, therefore need not in a metal on heart axleOpen up groove to arrange back-up ring, and the material for manufacturing metal center axle is reduced, and reduces cost.
Conventional motor shaft needs to carry out multiple smart car to outer wall, and as the material of motor shaft is steel, smart car difficulty is big,High cost, precision are also poor, and easily cause motor shaft distortion during smart car；And injection molded layers used herein, essenceAppearance of vehicle is easy, low cost, and high precision, metal center axle are not allowed yielding during smart car.Further, since injection molded layers have been used,Corrosion protection is served to metal center axle, and process is exposed due to metal shaft, need nickel plating on the outer wall of metal shaft, nickel platingTechnique is very big to the pollution of environment, and the injection molded layers that the application is planted are then a kind of antirust means of environmental protection.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically showThe description of example " or " some examples " etc. means specific features, structure, material or the spy described with reference to the embodiment or examplePoint is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of the term notIdentical embodiment or example are necessarily referred to.And, the specific features of description, structure, material or feature can be anyOne or more embodiments or example in combine in an appropriate manner.
With the above-mentioned desirable embodiment according to the present invention as enlightenment, by above-mentioned description, relevant staff is completeVarious change and modification can be carried out entirely in the range of without departing from this invention technological thought.The technology of this inventionProperty scope is not limited to the content on specification, it is necessary to determine its technical scope according to right.