CN201096184Y - Main reducing gear assembly automobile drive bridge assembly for establishing bearing pretightening - Google Patents

Abstract

The utility model relates to an automobile driving axle assembly which takes a main reducing gear assembly and a compensating gear as the core component, aiming at solving the problems of complexity and uncertainty in the operation of adjusting the tightening torque between the bearing of the driving gear and the bearings of the compensating gear, and the problems of complicated structure and poor reliability in current automobile driving axle assemblies. The driving gear shaft of the technical proposal is provided with a metal corrugated sleeve; the fit clearance between the left bearing of the compensating gear and the shell of the main reducing gear and the fit clearance between the right bearing of the compensating gear and the shell of the main reducing gear are compensated through rigid gaskets, thus realizing the establishment of the tightening torque of the bearing of the drive gear shaft and realizing the effect that the tightening torque of the clearance between the pinions of the drive gear and the driven gear and the tightening torque of the compensating gear are established at the same time. The automobile driving axle assembly is simplified in structure and can transfer the output torque of the motor reliably, thus improving the running safety of middle or high gear light automobiles and medium-sized automobiles.

Description

Set up the automobile drive axle assembly of the main gearbox assembly of bearing pre-tightened

Technical field

The utility model relates to main gearbox assembly and differential mechanism is the automobile drive axle assembly of core component structure.

Background technique

The automobile drive axle assembly is formed one of accessory as key light-duty, compact car, and its main structure formation comprises left and right half and axle housing, main gearbox assembly and differential mechanism component thereof.The main gearbox assembly structure of present all kinds of automobile drive axle assemblies, generally adopt the adjustment pad of choosing suitable thickness by measurement to finish the adjustment of bearing pre-fastening moment, online or the non-on-line measurement process that will carry out for the adjustment pad of selecting adaptation thickness before installing additional is comparatively complicated, and it is big to measure variation; Adjust the pad thinner thickness, under the axial load effect, easily be torn and come off, cause the driving gear shaft bearing pre-fastening moment to strengthen, cause that bearing temperature raises to produce premature sintering; For the adjustment pad is set, be processed with the ladder mounting platform on its driving gear shaft, it easily produces stress and concentrates in heat treatment process, thereby has reduced driving gear shaft intensity.In the structure of existing automobile drive axle assembly, the backlash adjustment of the active and passive gear width of cloth and the adjustment of differential bearing pre-fastening moment are by a reciprocity turn left side, right bearing is adjusted nut and it is locked and realizes, adjust nut and the fixedly component processing of locking plate thereof, the left side of bevel housing, the screw thread processing that place, right differential bearing hole cooperates with the adjustment nut thread is all quite loaded down with trivial details, and adjustment and fixing assembling with Peer are also very difficult, elder generation's active and passive gear backlash, the adjustment of rear bearing pre-fastening moment is easily interfered mutually, is difficult to make both to reach the technical standard requirement simultaneously; In addition, adjustment nut and bearing hole that spiral cooperates, the small burr that its screw thread processing exists, make the adjustment nut screw the back and easily produce the tight phenomenon of cooperation, adjust nut and under the horizontal component effect of the active and passive gear width of cloth, produce the relative position play, cause bearing pre-fastening moment to diminish, it is big that side clearance becomes, and therefore the gear engagement precision reduces greatly; Adjust on the nut and need evenly offer some being used for and friction tight fixed hole of pin mortice lock or groove, this structure that is locked is difficult under the best bearing pre-fastening moment state to satisfy simultaneously and adjusts nut and assemble with the fixing locking that aligns of locking plate, and fixedly locking plate has to depart to normotopia when adjusting nut check, the phenomenon of adjusting nut loosening under external force often occurs, and original bearing pre-fastening moment and active and passive gear flank back lash are destroyed.Series of technical causes driving gear axle bearing, differential bearing temperature to raise easily, cause the bearing premature sintering, the secondary accuracy of mesh of active and passive gear descends, wearing and tearing aggravation etc. can't be finished the potential failure mode that transmits engine output torque, influenced the driving safety of automobile greatly.

Summary of the invention

Goal of the invention of the present utility model is to provide a kind of automobile drive axle assembly that constitutes the main gearbox assembly of setting up bearing pre-tightened of setting up accurate, reliable bearing pre-fastening moment with simple structure.The technological scheme of the automobile drive axle assembly of the main gearbox assembly of setting up bearing pre-tightened of the present utility model, its major technique content is: a kind of automobile drive axle assembly of setting up the main gearbox assembly of bearing pre-tightened, it mainly is made of left and right half and axle housing, main gearbox assembly and the assembling of differential mechanism component, the driving gear shaft of main gearbox assembly is provided with the wavy metal cover, and this wavy metal puts port, lower end mouth and acts on elastic support on the inner ring end face of driving gear shaft outer bearing, inner bearing respectively; Press-fit respectively between the left and right half bearing outer ring exterior edge face of differential mechanism component and the left bearing of bevel housing lid, the right bearing lid interior edge face and be provided with left rigidity packing ring, right rigidity packing ring.

The technological scheme of the automobile drive axle assembly of the main gearbox assembly of setting up bearing pre-tightened that the utility model provides, the wavy metal nested structure that driving gear shaft is provided with, between its outer bearing and inner bearing, produce the elastic support of reserving the axial crushing deformation amount, with other component assembling of main reducing gear, under the Axial Loads that produces under the locking nut locking state, the wavy metal casing pressure is contractd produce the axial elasticity distortion slowly, in its reaction force puts on, make inner ring separately on the outer bearing, the outer ring closely cooperates, present technique has made full use of the axial elasticity deformation characteristic that wavy metal cover compression back produces, both eliminated axial displacement, thereby realize that bearing pre-fastening moment is from the technical purpose of setting up, and can in the normal break-in scope of bearing, realize the automatic compensation of bearing pre-fastening moment, prolonged bearing working life; Particularly obvious is because the wavy metal cover is provided with and need not to carry out axial dimension and measure, and can fast and accurately set up bearing pre-fastening moment, so simplified the selection assembly manipulation greatly, shortened assembly process; Moreover, the enforcement of spacer sheet bearing pre-pressing structure, its driving gear shaft is designed to convergent axle construction, produces the technical problem that stress is concentrated, reduced axle intensity thereby overcome its former hierarchic structure in heat treatment process, and its axis body intensity is able to effective raising.In the technical program, the rigidity packing ring of interference fit is set between differential left, right bearing and the final drive casing, the stress that its interference fit produces under locking state puts on differential left, the right bearing, thereby eliminate the axial displacement of inner ring and outer ring, reach the technical purpose that secondary backlash of active and passive gear and differential bearing pre-fastening moment are set up according to technical standard simultaneously.In measuring automatically, once select the actual (real) thickness of left and right rigidity packing ring, reduced the measurement variation; Interference fit stress after the rigidity packing ring press-fits, secondary backlash of active and passive gear and differential bearing pre-fastening moment are set up simultaneously and reached the technical standard requirement, overcome original adjustment nut equation has been adjusted the technical problem of insurmountable mutual interference, thereby guaranteed to realize efficiently when bearing pre-fastening moment and backlash are accurately set up the machinery assembling; Present technique has also been saved the processing of differential left on the former final drive casing, right bearing hole screw thread, adjusts nut, the fixedly setting of component such as locking plate in addition, and corresponding manufacturing operation has also been saved in its package assembly simplification.

In sum, technical solutions of the utility model, exclusive structure construction have overcome existing automobile drive axle assembly and have realized the existing technical deficiency of bearing pre-fastening moment in the adjustment mode, the reliable structure setting that employing is set up with bearing pre-fastening moment, transmission engine output torque that can be effective, stable, thus the driving safety of medium-to-high grade light-duty, compact car promoted.

Description of drawings

Fig. 1 is the general assembly structural representation of the automobile drive axle assembly of the main gearbox assembly of setting up bearing pre-tightened of the present utility model

Fig. 2 is the sectional structure schematic representation of the main gearbox assembly part of Fig. 1.

Embodiment

The automobile drive axle assembly of setting up the main gearbox assembly of bearing pre-tightened of the present utility model, its structure constitutes as shown in Figure 1, it is mainly by the main gearbox assembly that has the differential mechanism component at left and right half and axle housing and middle part, main gearbox assembly transmits engine output torque, by the transmission engagement and the differential mechanism 9 of its driving gear 10, driven gear 8, transmit output through left and right half 21,26.As shown in Figure 2, driving gear shaft 1 press-fits in bevel housing 4 through outer bearing 2 and inner bearing 3, and the outer end of driving gear shaft 1 is through flange plate 5 and auxiliary accessories and engine output shaft transmission joint such as oil sealing and flinger ring.Driving gear shaft 1 is provided with wavy metal cover 6, the upper end-hole of this wavy metal cover 6 and lower end mouth difference elastic reaction are on the inner ring end face 20,30 of outer bearing 2 and inner bearing 3, turn locking nut 7, the thrust load compressed metal radiation fins 6 that it produces on driving gear shaft 1, and make radiation fins 6 axial elasticity distortion slowly, its active force acts on inner bearing 3, the outer bearing 3, the inner ring and the outer ring of each bearing are closely cooperated, reach the technical purpose of eliminating axial displacement, setting up bearing pre-fastening moment.

Driven gear 8 and differential mechanism 9 are connected as one through bolt, and driving gear 10 and driven gear 8 constitute the gear width of cloth of gearing down; Differential mechanism 9 press-fits assembling through left bearing 11 and right bearing 12, left half axle 21 and right axle shaft 26 pass the left bearing lid 19 of bevel housing 4 and the bearing hole of right bearing lid 23 respectively, by differential mechanism component and main reducing gear component are measured automatically, select the left side of different-thickness, right rigidity packing ring 15,25, and simultaneously according to differential bearing pre-fastening moment technical standard, compensate identical value of interference fit respectively, it is press-fited respectively in the interior edge face and the left bearing 11 of the bearing bore of left bearing lid 19 and right bearing lid 23, between the exterior edge face, outer ring of right bearing 12, by a left side, the bolt 13 that right bearing covers, after the 22 fastening assemblings, the differential left that puts on its interference fit generation, on the bearing of right axle shaft, make two bearings in, the outer ring closely cooperates, thereby elimination axial displacement reaches the technical purpose that secondary backlash of active and passive gear and differential bearing pre-fastening moment are set up simultaneously.

Claims (1)

1, a kind of automobile drive axle assembly of setting up the main gearbox assembly of bearing pre-tightened, it mainly is made of left and right half and axle housing, main gearbox assembly and the assembling of differential mechanism component, the driving gear shaft (1) that it is characterized in that main gearbox assembly is provided with wavy metal cover (6), and this wavy metal puts port, lower end mouth and acts on elastic support on the inner ring end face of driving gear shaft outer bearing (2), inner bearing (3) respectively; Press-fit respectively between the left and right bearing outer ring exterior edge face of differential mechanism component and the left bearing of bevel housing lid (19), right bearing lid (23) interior edge face and be provided with left rigidity packing ring (15), right rigidity packing ring (25).

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