Split type wet drive axle with built-in differential lock

Abstract

The application belongs to the technical field of drive axle for engineering machinery, and discloses a split wet drive axle with built-in differential lock, which comprises an axle housing body, a left half axle housing and a right half axle housing connected to the two sides of the axle housing body, a differential is arranged in the axle housing body, a differential lock is also arranged in the axle housing body and is engaged with the differential, and the differential lock is arranged in the axle housing body through a mounting flange. The split wet drive axle with built-in differential lock has the advantages that the differential lock is arranged on the mounting flange in the axle housing body, so that the overall structure of the differential lock is compact, the differential lock occupies a small space and has good sealing performance, the split wet drive axle can play the function of the differential lock, the sealing performance and compactness of the drive axle are not damaged, the components of the differential lock are arranged in the axle housing body through the mounting flange, the appearance of the drive axle is not damaged, and the split wet drive axle has good market promotion prospects.

Description

Technical Field

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

[0002] The split-type wet drive axle is a common drive axle structure in the current vehicle industry, mainly used in light and small vehicles. The axle housing of a split-type wet drive axle typically consists of several parts, such as the axle housing body, the left half-shaft housing, and the right half-shaft housing. These parts are bolted together as a whole. The differential is housed in the central axle housing body. The left and right half-shaft housings respectively house the left and right half-shafts for connecting the left and right wheels, as well as wet brakes for braking. The drive gear of the reduction gear assembly is inserted into the axle housing body and meshes with the differential, transmitting power to the differential, which then transmits power to the wheels. This split-type wet drive axle structure has advantages such as good sealing, compact structure, good manufacturability, ease of casting and machining, and good support rigidity of the main reducer.

[0003] The differential lock device of the drive axle generally works by introducing gas or liquid into the cylinder of the differential lock, causing the cylinder to move the differential lock's shift fork, thereby locking the differential. However, most existing differential lock cylinders are externally mounted on the axle housing or bolted to it. This type of external differential lock requires a flange on the outside of the axle housing for mounting the cylinder, resulting in a large space occupied by the differential lock. This is detrimental to the sealing, compactness, and external aesthetics of the split wet drive axle structure. Therefore, to ensure its sealing, compactness, and external aesthetics, split wet drive axles on the market usually do not have a differential lock and thus do not have differential lock functionality.

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

[0005] The purpose of this invention is to provide a split wet drive axle with a built-in differential lock. The split wet drive axle has a differential lock structure inside, which can perform the function of a differential lock without compromising the sealing and compactness of the drive axle or its external aesthetics.

[0006] To achieve the above objectives, the invention adopts the following technical solution: A split-type wet drive axle with a built-in differential lock includes an axle housing body and a left half-shaft housing and a right half-shaft housing connected to both sides of the axle housing body. A differential is housed within the axle housing body, with the left and right half-shafts respectively connected to both sides of the differential. A differential lock, engaging with the differential, is also housed within the axle housing body. The differential includes a differential housing with a first engagement portion on either its left or right side. The differential lock includes a differential lock sleeve engaging with the first engagement portion, a shift fork fixed to the differential lock sleeve, a mounting flange fixed to the axle housing body, and a component passing through the mounting flange and the shift fork. The differential lock sleeve is splinedly engaged with the left or right half-shaft corresponding to the first engagement part. An oil reservoir is provided on the mounting flange, and a piston is slidably disposed within the oil reservoir. The shift fork is connected to the oil reservoir via the piston. An oil filling channel communicating with the oil reservoir is provided on the mounting flange. An mounting seat for mounting the connecting member is also provided on the inner mounting ring. The connecting member is inserted and fixed within the mounting seat. An elastic element for pushing the shift fork away from the mounting flange is sleeved on the connecting member. One end of the elastic element 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 engagement part that engages with the first engagement part at the position corresponding to the first engagement part.

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

[0009] Furthermore, the end of the piston away from the oil reservoir is a mounting end fixed on the shift fork. A split gasket is provided between the mounting end of the piston and the shift fork. The gasket includes a first piece and a second piece that are joined together. A groove is provided in the middle of the outer edge of both the first piece and the second piece. A retaining spring is provided in the groove for pressing the first piece and the second piece together.

[0010] Furthermore, the mounting flange is provided with two oil reservoirs, and the two oil reservoirs are respectively connected to the shift fork through corresponding pistons. The oil injection channel is connected to several oil reservoirs.

[0011] Furthermore, the mounting flange is provided with two mounting seats, which are respectively located on both sides of the two oil reservoirs. Each of the two mounting seats is provided with the connecting member and the elastic member.

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

[0013] By adopting the aforementioned design scheme, the beneficial effects of the invention are: The present invention relates to a split-type wet drive axle with a built-in differential lock. The differential lock is mounted on a mounting flange inside the axle housing, and a first engagement part for engaging with the differential lock sleeve is directly provided on the differential housing. This makes the overall structure of the differential lock compact, occupies little space, and has good sealing performance. This allows the split-type wet drive axle of the present invention to function as a differential lock without compromising the sealing and compactness of the drive axle. Furthermore, the components of the differential lock are all located inside the axle housing through the mounting flange, without affecting the external aesthetics of the drive axle, and thus has good market prospects.

[0014] Furthermore, the mounting inner ring of the present invention is provided with two oil reservoirs, which are connected to the shift fork by corresponding pistons. The mounting inner ring is also provided with two mounting seats. This arrangement can ensure the working strength of the differential lock.

[0015] Furthermore, the separate gasket and the retaining spring for pressing the first and second pieces together allow the gasket to be easily engaged in the retaining ring groove, and the retaining spring prevents it from easily falling off. Attached Figure Description

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

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

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

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

[0020] Figure 5 This is a perspective view of the mounting flange in a split wet drive axle with a built-in differential lock, showing the differential lock mounted on the mounting flange.

[0021] Figure 6 This is a front view of the mounting flange in a split wet drive axle with a built-in differential lock for the invention.

[0022] In the picture: 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 - Drive gear; 17-Differential housing; 131-Planetary gear; 140 - Left half-shaft gear; 150 - Right half-shaft gear; 151 - External spline; 171 - First meshing part; 2-Differential lock; 21-Differential lock sleeve; 22-Shift fork; 23-Mounting flange; 24-Connector; 25-Elastic component; 26-Oil reservoir; 27-Piston; 28 - Mounting base; 211 - Internal spline; 212 - Second meshing part; 231 - Fixed outer ring; 232 - Install inner ring; 233 - Oil injection channel; 234 - Oil inlet; 235 - Oil outlet; 3-Bearing; 4-Shim; 41-First piece; 42-Second piece; 5-Snap ring. Detailed Implementation

[0023] The technical solutions of the embodiments of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, and not all of them. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0024] like Figures 1 to 6As shown, a split-type wet drive axle with a built-in differential lock includes an axle housing body 1 and a left half-shaft housing 11 and a right half-shaft housing 12 connected to both sides of the axle housing body 1. A differential 13 is housed within the axle housing body 1, and a left half-shaft 14 and a right half-shaft 15 are respectively connected to the two sides of the differential 13. The structures of the axle housing body 1, left half-shaft housing 11, right half-shaft housing 12, differential 13, left half-shaft 14, and right half-shaft 15 are all conventional split-type wet drive axle structures in the art. The connection between the axle housing body 1 and the left half-shaft housing 11 and right half-shaft housing 12 adopts a conventional method in the art, such as bolt connection. Correspondingly, one end of the left half-shaft 14 is fixed to a left half-shaft gear 140 and rotatably connected to the differential via the left half-shaft gear 140. On the planetary gear 131 inside the differential 13, the other end of the left half-shaft 14 extends into the left half-shaft housing 11, and one end of the right half-shaft 15 is fixed on the right half-shaft gear 150 and is rotatably connected to the planetary gear 131 inside the differential 13 through the right half-shaft gear 150. The other end of the right half-shaft 15 extends into the right half-shaft housing 12. The axle housing body 1 has a hole for the drive gear 16 of the reducer assembly to be inserted. The drive gear 16 of the reducer assembly is inserted into the axle housing body 1 and meshes with the differential 13. During operation, the power source drives the reducer assembly to work. The drive gear 16 of the reducer assembly transmits power to the differential 13, and transmits power to the wheel assemblies on both sides (not shown in the figure) through the left half-shaft 14 and the right half-shaft 15 meshing in the differential 13.

[0025] The difference between this invention and the prior art is that the axle housing body 1 of this invention is further provided with a differential lock 2 that engages with the differential 13. Specifically, the differential 13 includes a differential housing 17, and the left or right side of the differential housing 17 has a first engagement part 171. The differential lock 2 includes a differential lock sleeve 21 that engages with the first engagement part 171, a shift fork 22 fixed on the differential lock sleeve 21, a mounting flange 23 fixed on the axle housing body 1, and a connecting member 24 passing through the mounting flange 23 and the shift fork 22. The differential lock sleeve 21 is splinedly engaged with the left half shaft 14 or the right half shaft 15 corresponding to the first engagement part 171. The connecting member 24 between the mounting flange 23 and the shift fork 22 is provided with an elastic member 25 for pushing the shift fork 22 away from the mounting flange 23.

[0026] It should be noted that the differential lock 2 of the present invention can be installed on either the left half-shaft 14 or the right half-shaft 15 depending on the actual situation. This embodiment only exemplifies the differential lock 2 being installed on the right half-shaft 15. Figures 1 to 3As shown, the differential lock 2 is mounted on the right half-shaft 15. Correspondingly, the differential lock sleeve 21 has an internal spline 211 inside, and the right half-shaft 15 has an external spline 151 that meshes with the internal spline 211 at the position corresponding to the differential lock sleeve 21. The differential lock sleeve 21 is fitted onto the right half-shaft 15 through the meshing of the external spline 151 and the internal spline 211, allowing the differential lock sleeve 21 to move left and right on the right half-shaft 15, but preventing it from rotating relative to the right half-shaft 15. The first engagement part 171 is integrally formed on the right side of the differential housing 17, and the left side of the differential lock sleeve 21 has an integrally formed second engagement part 212 that meshes with the first engagement part 171. Specifically, in this embodiment, the first engagement part 171 and the second engagement part 212 are mutually meshed. The meshing sleeve and mounting flange 23 include a fixing outer ring 231 for fixing to the axle housing body 1 and a mounting inner ring 232 for connecting to the shift fork 22. The shape of the fixing outer ring 231 is the same as the outer contour of the axle housing body 1. The fixing outer ring 231 is fixed between the axle housing body 1 and the right half-shaft housing 12. An oil reservoir 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 reservoir 26 are connected by a piston 27. One end of the piston 27 is a movable end that is slidably disposed in the oil reservoir 26. The oil reservoir 26 is provided with an inner cavity for the piston 27 to slide. The other end of the piston 27 is a mounting end fixed on the shift fork 22. The movable end of the piston 27 is sealed to the inner wall of the oil reservoir 26.

[0027] Specifically, such as Figures 1 to 3 As shown, the bottom of the oil reservoir 26 is located on the left side, and the right side of the oil reservoir 26 has an opening for the mounting end of the piston 27 to extend out. The piston 27 is sealed to the opening of the oil reservoir 26. There is a space between the movable end of the piston 27 and the oil reservoir 26 for hydraulic oil to enter. The mounting flange 23 has an oil injection channel 233 that connects to the oil reservoir 26. The oil injection channel 233 extends from the fixed outer ring 231 to the mounting inner ring 232 and connects to the oil reservoir 26. The oil inlet 234 of the oil injection channel 233 is located outside the fixed outer ring 231, and the oil outlet 235 of the oil injection channel 233 connects to the piston. The space between the movable end of piston 27 and the opening of oil reservoir 26; when differential lock 2 is not working, there is a gap between piston 27 and the bottom of oil reservoir 26; when differential lock 2 is working, hydraulic oil enters oil reservoir 26 from oil outlet 235 and pushes piston 27 against the bottom of oil reservoir 26; the inner ring 232 is also provided with a mounting seat 28 for mounting connector 24. The mounting seat 28 and oil reservoir 26 are located on the same side of the inner ring 232. Connector 24 is fixed inside mounting seat 28. One end of elastic member 25 abuts against the mounting seat 28 and the other end abuts against shift fork 22.

[0028] When the differential lock 2 is not working, the first engagement part 171 and the second engagement part 212 are in a disengaged state. When the differential lock 2 is working, the hydraulic oil pump presses hydraulic oil from the oil inlet 234 into the oil injection channel 233, and enters the oil reservoir 26 from the oil injection channel 233, pushing the piston 27 towards the bottom of the oil reservoir 26. The piston 27 drives the shift fork 22 and the differential lock sleeve 21 to move towards the differential housing 17 and compress the elastic element 25, so that the second engagement part 212 engages with the first engagement part 171. When the differential lock 2 is not needed, the hydraulic oil pump stops, the hydraulic oil pressure disappears, and the shift fork 22 and the differential lock sleeve 21 return to their original positions under the rebound action of the elastic element 25, so that the first engagement part 171 and the second engagement part 212 are disengaged again. It should be noted that the connecting part 24 in this embodiment adopts a conventional bolt connection in the art, and the elastic element 25 adopts a conventional spring in the art.

[0029] The present invention relates to a split-type wet drive axle with a built-in differential lock. The differential lock 2 is mounted on the mounting flange 23 inside the axle housing body 1, and a first engagement part 171 that engages with the differential lock sleeve 21 is directly provided on the differential housing 17. This makes the overall structure of the differential lock 2 compact, occupies little space, and has good sealing performance. This allows the split-type wet drive axle of the present invention to function as a differential lock without compromising the sealing and compactness of the drive axle. Furthermore, all components of the differential lock 2 are mounted inside the axle housing body 1 through the mounting flange 23, without compromising the external aesthetics of the drive axle, and thus has good market prospects.

[0030] Furthermore, such as Figure 1 and Figure 3 As shown, the mounting flange 23 is connected to the differential housing 17 via a bearing 3, which enables the differential housing 17 to provide a certain load-bearing capacity for 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 overall space, in order to ensure its working strength, the mounting inner ring 232 of the present invention is provided with two oil reservoirs 26, and each of the two oil reservoirs 26 is provided with a piston 27. The two oil reservoirs 26 are connected to the shift fork 22 through 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 communicates with the two oil reservoirs 26. By setting two oil reservoirs 26 and two pistons 27, the hydraulic pressure is increased. 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, the inner ring 232 is provided with two mounting seats 28, which are respectively located on both sides of the two oil reservoirs 26. Correspondingly, each of the two mounting seats 28 is provided with a connecting member 24 and an elastic member 25. By providing two mounting seats 28 and providing connecting members 24 and elastic members 25 in each of the two mounting seats 28, the disengagement speed of the differential lock 2 from 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 shift fork 22. Specifically, the gasket 4 includes a first piece 41 and a second piece 42 that are spliced ​​together. The first piece 41 and the second piece 42 have the same structure. There is a locking ring groove between the mounting end of the piston 27 and the shift fork 22 for placing the gasket 4. The first piece 41 and the second piece 42 are spliced ​​together and locked in the locking ring groove. A groove is opened in the middle of the outer edge of the first piece 41 and the second piece 42. A retaining spring 5 is provided in the groove for pressing the first piece 41 and the second piece 42 together. This arrangement makes it easy for the gasket 4 to be locked in the locking ring groove, and it is not easy to fall off due to the locking of the retaining spring 5.

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

Claims

1. A split-type wet drive axle with a built-in differential lock, comprising an axle housing body and a left half-shaft housing and a right half-shaft housing connected to both sides of the axle housing body, wherein a differential is provided within the axle housing body, and the left half-shaft and right half-shaft are respectively drivenly connected to both sides of the differential, characterized in that: The axle housing also includes a differential lock that engages with the differential. The differential includes a differential housing with a first engagement portion on its left or right side. The differential lock includes a differential lock sleeve that engages with the first engagement portion, a shift fork fixed to the differential lock sleeve, a mounting flange fixed to the axle housing, and a connecting piece passing through the mounting flange and the shift fork. The differential lock sleeve is splinedly connected to the left or right half-shaft corresponding to the first engagement portion. The mounting flange has an oil reservoir with a piston slidably disposed therein. The shift fork is connected to the oil reservoir via the piston. The mounting flange has an oil filling channel communicating with the oil reservoir. The mounting flange includes a fixing mechanism for fixing to the axle housing. The device comprises an outer ring and an inner ring for connecting to a shift fork. The inner ring is also provided with a mounting seat for mounting the connector. The oil reservoir and the mounting seat are both fixed on the inner ring. The connector passes through and is fixed in the mounting seat. An elastic element for pushing the shift fork away from the mounting flange is sleeved on the connector. One end of the elastic element abuts against the mounting seat, and the other end abuts against the shift fork. The end of the piston away from the oil reservoir is the mounting end fixed on the shift fork. A split gasket is provided between the mounting end of the piston and the shift fork. The gasket includes a first piece and a second piece that are joined together. A groove is provided in the middle of the outer edge of both the first piece and the second piece. A retaining spring is provided in the groove for pressing the first piece and the second piece together.

2. A split-type 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 engagement part that engages with the first engagement part at the position corresponding to the first engagement part.

3. A split-type 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-type wet drive axle with a built-in differential lock according to claim 1, characterized in that, The mounting flange is provided with two oil reservoirs, and the two oil reservoirs are respectively connected to the shift fork through corresponding pistons. The oil injection channel is connected to several oil reservoirs.

5. A split-type wet drive axle with a built-in differential lock according to claim 4, characterized in that, The mounting flange is provided with two mounting seats, which are respectively located on both sides of the two oil reservoirs. Each of the two mounting seats is provided with the connecting member and the elastic member.

Images