Split type wet drive axle with built-in differential lock

Abstract

The invention belongs to the technical field of drive axles for engineering machinery, and discloses a split type wet drive axle with a built-in differential lock, which comprises an axle housing body, a left half axle housing and a right half axle housing, the left half axle housing and the right half axle housing are connected to two sides of the axle housing body, a differential mechanism is arranged in the axle housing body, and the differential lock meshed and matched with the differential mechanism is further arranged in the axle housing body. And the differential lock is arranged in the axle housing body through the mounting flange. According to the split type wet drive axle with the built-in differential lock, the differential lock is arranged on the mounting flange in the axle housing body, so that the integral structure of the differential lock is compact, the occupied space is small, the sealing performance is good, and the split type wet drive axle can play a role of the differential lock; moreover, the components of the differential lock are arranged in the axle housing body through the mounting flanges, so that the attractiveness of the exterior of the drive axle cannot be damaged, and the differential lock has a good market popularization prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of drive axles for engineering machinery, and in particular relates to a split wet drive axle with a built-in differential lock. Background Art

[0002] The split wet drive axle is a common drive axle structure in the existing vehicle field. It is mainly used in light and small vehicles. The axle housing of the split wet drive axle is usually composed of multiple parts, such as the axle housing body, the left half-axle housing and the right half-axle housing. These parts are connected into a whole by bolts. The middle axle housing body is equipped with a differential. The left half-axle housing and the right half-axle housing are respectively equipped with a left half-axle and a right half-axle for connecting the left and right wheels, and a wet brake for braking. The driving gear of the reducer assembly is inserted into the axle housing body and meshes with the differential to transmit power to the differential, and then transmit the power to the wheel through the differential. This split wet drive axle structure has the advantages of good sealing, compact structure, good processability, easy casting processing, and good main reducer support stiffness.

[0003] The differential lock device of the drive axle generally realizes the function of locking the differential by introducing gas or liquid into the cylinder of the differential lock, so that the cylinder drives the fork of the differential lock to move. However, the cylinders of the existing differential locks are mostly installed on the bridge housing in an external manner, or fixed to the bridge housing with bolts. For this kind of external differential lock, the outer side of the bridge housing body must be equipped with a flange surface for installing the cylinder, resulting in a large space occupied by the differential lock, which is not conducive to the closedness, compactness and external aesthetics of the split wet drive axle structure. Therefore, in order to ensure its closedness, compactness and external aesthetics, the split wet drive axles currently on the market usually do not have differential locks, and do not have the differential lock function.

[0004] In view of this, the applicant conducted in-depth research on the above issues, which led to the present case. Summary of the invention

[0005] The purpose of the invention is to provide a split wet drive axle with a built-in differential lock, wherein the split wet drive axle is provided with a differential lock structure inside, which can function as a differential lock without destroying the closedness and compactness of the drive axle and the external aesthetics.

[0006] In order to achieve the above object, the invention adopts the following technical solution: A split wet drive axle with a built-in differential lock, comprising a bridge housing body and a left half-shaft housing and a right half-shaft housing connected to both sides of the bridge housing body, a differential is arranged in the bridge housing body, and the left half-shaft and the right half-shaft are respectively connected to the two sides of the differential in a driving manner, and a differential lock engaged with the differential is also arranged in the bridge housing body, the differential comprises a differential housing, a first engaging portion is provided on the left or right side of the differential housing, and the differential lock comprises a differential lock sleeve engaged with the first engaging portion, a shift fork fixed on the differential lock sleeve, a mounting flange fixed on the bridge housing body, and a mounting flange inserted between the mounting flange and the shift fork The differential lock sleeve is connected to the left half shaft or the right half shaft corresponding to the first engaging portion through spline engagement, an oil storage seat is provided on the mounting flange, a piston is slidably provided in the oil storage seat, the shift fork is connected to the oil storage seat through the piston, an oil filling channel connected to the oil storage seat is provided on the mounting flange, a mounting seat for mounting the connecting piece is also provided on the mounting inner ring, the connecting piece is penetrated and fixed in the mounting seat, an elastic piece for pushing the shift fork away from the mounting flange is sleeved on the connecting piece, one end of the elastic piece abuts against the mounting seat, and the other end abuts against the shift fork.

[0007] Furthermore, the differential lock sleeve is provided with a second meshing portion meshing with the first meshing portion at a position corresponding to the first meshing portion.

[0008] Furthermore, the mounting flange is connected to the differential housing via a bearing.

[0009] Furthermore, one end of the piston away from the oil storage seat is a mounting end fixed on the fork, and a split gasket is provided between the mounting end of the piston and the fork, and the gasket includes a first sheet and a second sheet that are assembled with each other, and a groove is provided in the middle of the outer edge of the first sheet and the second sheet, and a retaining spring is provided in the groove for pressing the first sheet and the second sheet together.

[0010] Furthermore, two oil storage seats are provided on the mounting flange, and the two oil storage seats are respectively connected to the shift fork through the corresponding pistons, and the oil injection channel is connected to a plurality of the oil storage seats.

[0011] Furthermore, two mounting seats are provided on the mounting flange, and the two mounting seats are respectively arranged on both sides of the two oil storage seats, and the connecting member and the elastic member are both provided in the two mounting seats.

[0012] Furthermore, the mounting flange includes a fixed outer ring for fixing to the bridge housing body and a mounting inner ring for connecting to the shift fork, and the oil storage seat and the mounting seat are both fixed on the mounting inner ring.

[0013] By adopting the above-mentioned design scheme, the beneficial effects of the invention are: The split wet drive axle with a built-in differential lock of the present invention has a differential lock arranged on a mounting flange in a bridge housing body, and a first engaging portion engaging with a differential lock sleeve is directly provided on the differential housing, so that the overall structure of the differential lock is compact, the space occupied is small and the sealing property is good, so that the split wet drive axle of the present invention can function as a differential lock without damaging the sealing property and compactness of the drive axle, and the components of the differential lock are all arranged inside the bridge housing body through the mounting flange, which will not damage the external aesthetics of the drive axle, and has good market promotion prospects.

[0014] Furthermore, the mounting inner ring of the present invention is provided with two oil storage seats, the two oil storage seats are connected to the shift fork through one-to-one corresponding pistons, and the mounting inner ring is provided with two mounting seats. Such an arrangement can ensure the working strength of the differential lock.

[0015] Furthermore, a split gasket and a retaining spring for pressing the first sheet body and the second sheet body together are provided, so that the gasket can be conveniently retained in the retaining ring groove and is not easily removed due to the retaining of the retaining spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic cross-sectional view of the entirety of a split wet drive axle with a built-in differential lock, in which the connection structure between the shift fork and the flange is omitted.

[0017] Figure 2 The invention is a schematic cross-sectional view of the connection structure between the shift fork and the mounting flange in a split wet drive axle with a built-in differential lock.

[0018] Figure 3 The present invention is a three-dimensional schematic diagram of the exploded state of a split wet drive axle with a built-in differential lock, in which the left half-shaft, the left half-shaft housing and the right half-shaft housing are omitted.

[0019] Figure 4 The invention is a three-dimensional schematic diagram of a mounting flange in a split wet drive axle with a built-in differential lock.

[0020] Figure 5 The present invention is a three-dimensional schematic diagram of another perspective of the mounting flange in the split wet drive axle with a built-in differential lock, in which the differential lock is arranged on the mounting flange.

[0021] Figure 6 A perspective front view schematic diagram of a mounting flange in a split wet drive axle with a built-in differential lock.

[0022] In the figure: 1-Axle housing body; 11-left half shaft housing; 12-right half shaft housing; 13-differential; 14-left half shaft; 15-right half shaft; 16-driving gear; 17-differential housing; 131-planetary gear; 140-left half shaft gear; 150-right half shaft gear; 151-external spline; 171-first meshing portion; 2-differential lock; 21-differential lock sleeve; 22-shift fork; 23-mounting flange; 24-connecting member; 25-elastic member; 26- oil storage seat; 27- piston; 28-mounting seat; 211-internal spline; 212 - second meshing portion; 231 - fixed outer ring; 232-Installation of inner ring; 233-Oil injection channel; 234- oil inlet hole; 235- oil outlet hole; 3-bearing; 4-gasket; 41-first sheet; 42-second sheet; 5-Circlip. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the invention in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0024] like Figures 1 to 6As shown, a split wet drive axle with a built-in differential lock comprises a bridge housing body 1 and a left half-shaft housing 11 and a right half-shaft housing 12 connected to both sides of the bridge housing body 1. A differential 13 is arranged in the bridge housing body 1. The left half-shaft 14 and the right half-shaft 15 are respectively connected to the two sides of the differential 13. The structures of the bridge housing body 1, the left half-shaft housing 11, the right half-shaft housing 12, the differential 13, the left half-shaft 14 and the right half-shaft 15 are all conventional split wet drive axles in the art. The connection method of the bridge housing body 1 and the left half-shaft housing 11 and the right half-shaft housing 12 adopts the conventional method in the art, such as bolt connection. Accordingly, one end of the left half-shaft 14 is fixed on the left half-shaft gear 140 and is rotatably connected to the differential through the left half-shaft gear 140. The left axle 14 is connected to the planetary gear 131 in the differential 13, the other end of the left axle 14 extends into the left axle housing 11, one end of the right axle 15 is fixed on the right axle gear 150, and is rotatably connected to the planetary gear 131 in the differential 13 through the right axle gear 150, and the other end of the right axle 15 extends into the right axle housing 12; a hole for inserting a driving gear 16 of the reducer assembly is opened on the bridge housing body 1, and the driving gear 16 of the reducer assembly is inserted into the bridge housing body 1 and meshed with the differential 13. When working, the power source drives the reducer assembly to work, and the driving gear 16 of the reducer assembly transmits power to the differential 13, and transmits power to the wheel side assemblies on both sides (not shown in the figure) through the left axle 14 and the right axle 15 meshed in the differential 13.

[0025] The difference between the present invention and the prior art lies in that a differential lock 2 meshing with the differential 13 is further provided in the bridge housing body 1 of the present invention. Specifically, the differential 13 includes a differential housing 17, and the left or right side of the differential housing 17 has a first meshing portion 171. The differential lock 2 includes a differential lock sleeve 21 meshing with the first meshing portion 171, a shift fork 22 fixed on the differential lock sleeve 21, a mounting flange 23 fixed on the bridge housing body 1, and a connecting member 24 penetrated through the mounting flange 23 and the shift fork 22. The differential lock sleeve 21 is connected to the left half shaft 14 or the right half shaft 15 corresponding to the first meshing portion 171 through spline meshing, and an elastic member 25 for pushing the shift fork 22 away from the mounting flange 23 is sleeved on the connecting member 24 between the mounting flange 23 and the shift fork 22.

[0026] It should be noted that the differential lock 2 of the present invention can be arranged on the left half shaft 14 or the right half shaft 15 according to actual conditions. In this embodiment, the differential lock 2 is arranged on the right half shaft 15 as an example. Figures 1 to 3As shown, the differential lock 2 is arranged on the right half shaft 15, and correspondingly, an internal spline 211 is arranged inside the differential lock sleeve 21, and an external spline 151 meshing with the internal spline 211 is arranged at a position on the right half shaft 15 corresponding to the differential lock sleeve 21. The differential lock sleeve 21 is sleeved on the right half shaft 15 through the meshing of the external spline 151 and the internal spline 211, so that the differential lock sleeve 21 can move left and right on the right half shaft 15, and cannot rotate relative to the right half shaft 15; the first meshing portion 171 is integrally formed on the right side of the differential housing 17, and the second meshing portion 212 meshing with the first meshing portion 171 is integrally formed on the left side of the differential lock sleeve 21. Specifically, the first meshing portion 171 and the second meshing portion 212 in this embodiment are meshing with each other. The mounting flange 23 includes a fixed outer ring 231 for fixing to the bridge housing body 1 and a mounting inner ring 232 for connecting to the shift fork 22. The shape of the fixed outer ring 231 is the same as the outer contour of the bridge housing body 1. The fixed outer ring 231 is fixedly arranged between the bridge housing body 1 and the right half-shaft housing 12. An oil storage seat 26 is provided on the side of the mounting inner ring 232 away from the shift fork 22. The shift fork 22 and the oil storage seat 26 are connected by a piston 27. One end of the piston 27 is a movable end slidably arranged in the oil storage seat 26. The oil storage seat 26 is provided with an inner cavity for the piston 27 to slide. The other end of the piston 27 is a mounting end fixedly arranged on the shift fork 22. The movable end of the piston 27 is sealed and connected to the inner side wall of the oil storage seat 26.

[0027] Specifically, Figures 1 to 3 As shown, the bottom of the oil reservoir seat 26 is located on the left side, and the right side of the oil reservoir seat 26 has an opening for the mounting end of the piston 27 to extend out, the piston 27 is sealed and connected to the opening of the oil reservoir seat 26, and there is a space for hydraulic oil to enter between the movable end of the piston 27 and the oil reservoir seat 26, and an oil injection channel 233 connected to the oil reservoir seat 26 is opened on the mounting flange 23, and the oil injection channel 233 extends from the fixed outer ring 231 to the mounting inner ring 232 and is connected to the oil reservoir seat 26, and the oil inlet hole 234 of the oil injection channel 233 is opened on the outer side of the fixed outer ring 231, and the oil outlet hole 235 of the oil injection channel 233 is connected to the piston There is a space between the movable end of 27 and the opening of the oil reservoir seat 26; when the differential lock 2 is not working, there is a distance between the piston 27 and the bottom of the oil reservoir seat 26. When the differential lock 2 is working, the hydraulic oil enters the oil reservoir seat 26 from the oil outlet hole 235 and pushes the piston 27 to the bottom of the oil reservoir seat 26; a mounting seat 28 for mounting the connecting member 24 is also provided on the mounting inner ring 232, and the mounting seat 28 and the oil reservoir seat 26 are located on the same side of the mounting inner ring 232, the connecting member 24 is penetrated and fixed in the mounting seat 28, one end of the elastic member 25 is pressed against the mounting seat 28, and the other end is pressed against the fork 22.

[0028] When the differential lock 2 is not working, the first meshing portion 171 and the second meshing portion 212 are in a disengaged state. When the differential lock 2 is working, the hydraulic oil pump presses the hydraulic oil from the oil inlet hole 234 into the oil filling channel 233, and enters the oil reservoir 26 from the oil filling channel 233 to squeeze the piston 27 toward the bottom of the oil reservoir 26. The piston 27 drives the shift fork 22 and the differential lock sleeve 21 to move toward the direction of the differential housing 17 and compresses the elastic member 25, so that the second meshing portion 212 meshes with the first meshing portion 171. When the differential lock 2 is not needed to work, the hydraulic oil pump stops, the pressure of the hydraulic oil disappears, and the shift fork 22 and the differential lock sleeve 21 return to their original positions under the rebound action of the elastic member 25, so that the first meshing portion 171 and the second meshing portion 212 are in a disengaged state again. It should be noted that the connecting member 24 in this embodiment adopts a conventional bolt connecting member in the field, and the elastic member 25 adopts a conventional spring in the field.

[0029] The split wet drive axle with a built-in differential lock of the present invention has a differential lock 2 arranged on a mounting flange 23 in a bridge housing body 1, and a first engaging portion 171 engaging with a differential lock sleeve 21 is directly provided on the differential housing 17, so that the overall structure of the differential lock 2 is compact, the space occupied is small and the sealing is good, so that the split wet drive axle of the present invention can function as a differential lock without damaging the sealing and compactness of the drive axle, and the components of the differential lock 2 are all arranged inside the bridge housing body 1 through the mounting flange 23, which will not damage the external aesthetics of the drive axle, and has good market promotion prospects.

[0030] Further, if Figure 1 and Figure 3 As shown, the mounting flange 23 is connected to the differential housing 17 via the bearing 3 , so that the differential housing 17 can play a certain bearing role on the differential lock 2 , further enhancing the overall stability of the differential lock 2 .

[0031] Furthermore, since the differential lock 2 of the present invention occupies a small space as a whole, in order to ensure its working strength, two oil reservoirs 26 are provided on the mounting inner ring 232 of the present invention, and pistons 27 are respectively provided in the two oil reservoirs 26. The two oil reservoirs 26 are connected to the shift fork 22 through the one-to-one corresponding pistons 27. Preferably, in this embodiment, the two oil reservoirs 26 are arranged adjacent to each other, and the oil injection channel 233 is arranged between the two oil reservoirs 26 and communicated with the two oil reservoirs 26. By providing two oil reservoirs 26 and two pistons 27, the hydraulic The oil can drive the shift fork 22 to move through the two pistons 27, which can increase the locking speed of the differential lock 2. Furthermore, two mounting seats 28 are provided on the inner ring 232, and the two mounting seats 28 are respectively arranged on both sides of the two oil storage seats 26. Correspondingly, the two mounting seats 28 are each provided with a connecting piece 24 and an elastic piece 25. By providing two mounting seats 28 and providing the connecting piece 24 and the elastic piece 25 in the two mounting seats 28, the disengagement speed of the differential lock 2 and the differential housing 17 can be increased, thereby ensuring the working strength of the differential lock 2.

[0032] Furthermore, a split gasket 4 is provided between the mounting end of the piston 27 and the fork 22. Specifically, the gasket 4 includes a first sheet 41 and a second sheet 42 that are assembled together. The first sheet 41 and the second sheet 42 have the same structure. A clamping ring groove for placing the gasket 4 is provided between the mounting end of the piston 27 and the fork 22. The first sheet 41 and the second sheet 42 are assembled and clamped in the clamping ring groove. A groove is provided in the middle of the outer edge of the first sheet 41 and the second sheet 42. A retaining spring 5 for pressing the first sheet 41 and the second sheet 42 together is provided in the groove. This arrangement can facilitate the gasket 4 to be clamped in the clamping ring groove, and it is not easy to fall off due to the clamping of the retaining spring 5.

[0033] Although embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A split wet drive axle with a built-in differential lock, comprising a bridge housing body and a left half-shaft housing and a right half-shaft housing connected to both sides of the bridge housing body, wherein a differential is arranged in the bridge housing body, and the left half-shaft and the right half-shaft are respectively connected to the two sides of the differential, characterized in that: The axle housing body is also provided with a differential lock engaged with the differential, the differential includes a differential housing, the left side or right side of the differential housing has a first engaging portion, the differential lock includes a differential lock sleeve engaged with the first engaging portion, a shift fork fixed on the differential lock sleeve, a mounting flange fixed on the axle housing body, and a connecting piece penetrated through the mounting flange and the shift fork, the differential lock sleeve is connected to the left half shaft or the right half shaft corresponding to the first engaging portion through spline engagement An oil storage seat is provided on the mounting flange, a piston is slidably provided in the oil storage seat, the shift fork is connected to the oil storage seat through the piston, an oil injection channel connected to the oil storage seat is opened on the mounting flange, a mounting seat for mounting the connecting piece is also provided on the mounting inner ring, the connecting piece is penetrated and fixed in the mounting seat, an elastic piece for pushing the shift fork away from the mounting flange is sleeved on the connecting piece, one end of the elastic piece abuts against the mounting seat, and the other end abuts against the shift fork.

2. A split wet drive axle with a built-in differential lock according to claim 1, characterized in that: The differential lock sleeve is provided with a second meshing portion meshing with the first meshing portion at a position corresponding to the first meshing portion.

3. A split wet drive axle with a built-in differential lock according to claim 1, characterized in that: The mounting flange is connected to the differential housing via a bearing.

4. A split wet drive axle with a built-in differential lock according to claim 1, characterized in that: One end of the piston away from the oil storage seat is a mounting end fixed on the fork, and a split gasket is provided between the mounting end of the piston and the fork, and the gasket includes a first sheet and a second sheet that are assembled with each other, and a groove is provided in the middle of the outer edge of the first sheet and the second sheet, and a retaining spring for pressing the first sheet and the second sheet together is provided in the groove.

5. A split wet drive axle with a built-in differential lock according to claim 1, characterized in that: Two oil storage seats are arranged on the mounting flange, and the two oil storage seats are respectively connected to the shift fork through the corresponding pistons, and the oil injection channel is communicated with a plurality of the oil storage seats.

6. A split wet drive axle with a built-in differential lock according to claim 5, characterized in that: Two mounting seats are arranged on the mounting flange, and the two mounting seats are respectively arranged on both sides of the two oil storage seats, and the connecting member and the elastic member are arranged in the two mounting seats.

7. A split wet drive axle with a built-in differential lock according to claim 1, characterized in that: The mounting flange comprises a fixed outer ring for fixing with the bridge housing body and a mounting inner ring for connecting with the shift fork, and the oil storage seat and the mounting seat are both fixedly arranged on the mounting inner ring.

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