Novel inclined tray axial plunger pumpTechnical field
The invention belongs to railway switch machine hydraulic system pump technical fields, and in particular to a kind of novel inclined tray is axialPlunger pump.
Background technique
With the rapid development of railway technology, the separation of track turnout is become controlling automatically from original manual controlSystem, this just requires Hydraulic Switch Machine system not only to have very high reliability requirement when automatically controlling, but also is breaking downWhen, system can manual switching at the low rotational speed, and the reliability of original hydraulic pump is not able to satisfy system requirements.Patent of invention ShenIt numbers 201120206690.8 please disclose a kind of " plunger pump " (calling file 1 in the following text), the fixed peace of the swash plate of hemisphere face structure in file 1Loaded on rear pump body, when main shaft drives plunger to do flexible move back and forth in the cylinder holes of cylinder body, plunger is that sliding rubs with swash plateIt wipes, frictional resistance is big, meanwhile, the installation form of plunger is clad type structure, and installation difficulty is larger；Application number of invention patent201220064342.6 disclose a kind of " novel axial plunger pump " (calling file 2 in the following text), and swash plate is fixedly installed in rear cover in file 2In inner cavity, plunger end face is butted on always on the disc end face being cooperatively connected with swash plate, and main shaft makes plunger exist after driving plunger rotationWhen doing flexible move back and forth in plunger hole, under plunger spring effect, plunger end face is butted on always on disc end face, and plunger is turningIt with disc is sliding friction during dynamic, meanwhile, plunger spring connect in plunger hole and with plunger is vulnerable part, is replacedDifficulty is big, and the failure rate of plunger pump is big, in summary, it is necessary to improve.
Summary of the invention
Present invention solves the technical problem that: a kind of novel inclined tray axial plunger pump is provided, fixed is inclined traditionalSwash plate is changed to rotary pitch, and pitch is made to follow plunger rotation, substantially reduces the frictional force of pitch and plunger, improvesMechanical efficiency meets the belief system requirement of hydraulic pump, while plunger and piston shoes is designed as plunger assembly, structure letterIt is single, greatly reduce the assembly difficulty of each section.
The technical solution adopted by the present invention: novel inclined tray axial plunger pump, including the preceding pump housing, the intermediate pump housing, cylinder body,The pump housing and transmission shaft afterwards, the preceding pump housing are installed on transmission shaft one end by bearing, and the cylinder body is set in the transmission shaft other endAnd connect with the spline fitted of the transmission shaft other end, steel loop and cylinder body excircle are interference fitted, and the intermediate pump housing passes through needle rollerBearing I and steel loop excircle are cooperatively connected, described intermediate pump housing one end and the preceding pump housing be fixedly connected and the intermediate pump housing other end andThe rear pump housing positioned at the transmission shaft other end is fixedly connected, and is formed with installation inclined hole in the rear pump housing and is set to inside installation inclined holePitch and the rear pump housing are rotatablely connected, and platen are equipped between the pitch and cylinder body, in transmission shaft other end splineIt is butted in the middle part of platen after steel ball and platen cooperation in steel ball and spring holder assembly, is formed with multiple be uniformly distributed on the cylinder body end facePlunger hole and platen on be formed with through-hole corresponding with plunger hole hole location, plunger assembly one end is inserted into plunger hole after passing through through-holeAnd be slidably matched with plunger hole, it is butted in inclination side surface and leads to after the plunger assembly other end and the through-hole cooperation on platenCrossing after transmission shaft drives plunger rotation makes pitch follow plunger rotation.
Wherein, the installation inclined hole is stepped hole and installation inclined hole is provided with needle bearing II and ball bearing, described to inclineIt is installed on the rear pump housing after swash plate and needle bearing II and ball bearing interference fit.
Further, the plunger assembly includes plunger and piston shoes, and installation rank hole, the installation are formed with inside the piston shoesRank hole right end is equipped with locking nut and one end is formed with after screwing in externally threaded plunger insertion installation rank hole with locking nut cooperationPlunger is fixedly installed on piston shoes, plunger other end end is butted on the limited cap on pitch and being set to the plunger other endLower end is inserted into through-hole, and the piston shoes are passed through in through-hole insertion plunger hole and are slidably matched with plunger hole.
Further, V-shaped groove is formed in the middle part of the platen right side and V-shaped groove bottom surface is formed with hemisphere compatible with steel ballSlot, the steel ball are pushed against pitch by steel ball and spring holder assembly promotion platen drive plunger assembly after cooperating with half ball groove.
The present invention compared with prior art the advantages of:
1, make pitch after being cooperatively connected by the ball bearing II and ball bearing and pitch that are set in installation inclined holeIt is rotatablely connected with the rear pump housing, traditional fixed pitch is changed to rotary pitch, so that pitch is followed plunger rotation, makesTraditional sliding friction becomes rolling friction, substantially reduces the frictional force of pitch and plunger, improves mechanical efficiency, meetsThe belief system requirement of hydraulic pump；
2, plunger and piston shoes are designed as plunger assembly, are fixedly connected with plunger by locking nut with piston shoes, structure letterIt is single, it is quickly and expediently installed, greatly reduces the assembly difficulty of each section, meet craftsmanship requirement；
3, this structure be applied to goat system, improve the reliability of hydraulic pump, can complete import substitutes,Strong technical guarantee is provided for the development of China railways system.
Detailed description of the invention
Fig. 1 is schematic diagram of internal structure of the present invention；
Fig. 2 is the mounting structure schematic diagram of the pump housing and pitch after the present invention；
Fig. 3 is plunger assembly structural schematic diagram of the present invention.
Specific embodiment
1-3 describes a kind of embodiment of the invention with reference to the accompanying drawing.
Novel inclined tray axial plunger pump, including the preceding pump housing 9, the intermediate pump housing 17, cylinder body 12, the rear pump housing 18 and transmission shaft2, the preceding pump housing 9 is installed on 2 one end of transmission shaft by bearing, the cylinder body 12 be set in 2 other end of transmission shaft and with transmissionThe spline fitted of 2 other end of axis connects, and steel loop 13 and 12 excircle of cylinder body are interference fitted, and the intermediate pump housing 17 passes through needle roller axisI 14 and the mating connection of 13 excircle of steel loop are held, described intermediate 17 one end of the pump housing and the preceding pump housing 9 are fixedly connected and the intermediate pump housing 17 is anotherOne end is fixedly connected with the rear pump housing 18 for being located at 2 other end of transmission shaft, is formed with installation inclined hole 1 in the rear pump housing 18 and is set to peaceIt fills pitch 20 and the rear pump housing 18 inside inclined hole 1 to be rotatablely connected, platen 15 is equipped between the pitch 20 and cylinder body 12, ifSteel ball 16 and platen 15 in the steel ball and spring holder assembly in 2 other end spline of transmission shaft are butted on 15 middle part of platen after cooperating,It is formed on 12 end face of cylinder body on multiple equally distributed plunger holes 3 and platen 15 and is formed with lead to corresponding with 3 hole location of plunger holeHole 4,11 one end of plunger assembly are inserted into plunger hole 3 after passing through through-hole 4 and are slidably matched with plunger hole 3, the plunger assembly 11The other end is butted on 20 end face of pitch after cooperating with the through-hole 4 on platen 15 and makes after driving plunger 6 to rotate by transmission shaft 2Pitch 20 follows plunger 6 to rotate；Specifically, the installation inclined hole 1 is stepped hole and installation inclined hole 1 is provided with needle bearing II19 and ball bearing 21, the pitch 20 is installed on the rear pump housing 18 after being interference fitted with needle bearing II 19 and ball bearing 21On；Specifically, the plunger assembly 11 includes plunger 6 and piston shoes 7, installation rank hole 8, the installation are formed with inside the piston shoes 78 right end of rank hole is equipped with locking nut 22 and one end is formed in the externally threaded insertion of plunger 6 installation rank hole 8 and cooperates with locking nut 22Plunger 6 is fixedly installed on piston shoes 7 after screwing, 6 other end end of plunger is butted on pitch 20 and is set to plunger 6 separatelyIn 10 lower end of the limited cap insertion through-hole 4 of one end, the piston shoes 7 pass through through-hole 4 and are inserted into plunger hole 3 and slide with plunger hole 3Cooperation；Specifically, 15 right side of the platen middle part is formed with V-shaped groove and V-shaped groove bottom surface is formed with hemisphere compatible with steel ball 16Platen 15 is pushed to drive plunger assembly 11 by pitch by steel ball and spring holder assembly after slot 5, the steel ball 16 and the cooperation of half ball groove 520 push against.
In this structure, under the action of steel ball and spring holder assembly, steel ball 16 is pushed against always on 15 end face of platen, and byPlaten 15 drives plunger assembly 11 to push against 6 end of plunger in plunger assembly 11 on 20 end face of pitch, when work, transmissionAxis 2 drives steel ball and spring holder assembly, cylinder body 12, plunger assembly 11 and platen 15 to rotate synchronously after rotating, in the effect of plunger 6Under, pitch 20 follows plunger 6 to rotate, at this point, plunger 6 and pitch 20 are pivoting friction, frictional force is substantially reduced, such as Fig. 1Shown, under the action of pitch 20, the sealed volume that the plunger 6 and cylinder body 12 for turning to 2 top of transmission shaft are formed is maximum, liquidPressure oil is pressed under the action of atmosphere through oil inlet, and the sealing that the plunger 6 and cylinder body 12 positioned at 2 lower section of transmission shaft are formed is heldChamber is minimum, and hydraulic oil is forced out under the action of atmosphere through oil outlet.This structure passes through the ball axis being set in installation inclined hole 1It is rotatablely connected pitch 20 and the rear pump housing 18 after holding II 19 and ball bearing 21 and the mating connection of pitch 20, traditional is consolidatedFixed pattern pitch 20 is changed to rotary pitch 20, makes pitch 20 that plunger 6 be followed to rotate, traditional sliding friction is made to become rollingDynamic friction substantially reduces the frictional force of pitch 20 Yu plunger 6, improves mechanical efficiency, meets the reliability system of hydraulic pumpSystem requires, and plunger 6 and piston shoes 7 are designed as plunger assembly, is fixedly connected with plunger 6 by locking nut 22 with piston shoes 7, structureSimply, it is quickly and expediently installed, greatly reduces the assembly difficulty of each section, meet craftsmanship requirement, this structure is applied to railwayGoat system improves the reliability of hydraulic pump, can complete import substitutes, the development for China railways system providesStrong technical guarantee.
Above-described embodiment, only presently preferred embodiments of the present invention, is not intended to limit the invention practical range, therefore all with thisThe equivalence changes that content described in invention claim is done should all be included within scope of the invention as claimed.