A multi-functional speed reducer assembly

Abstract

The application provides a multifunctional speed reducer assembly, comprising a differential assembly and a speed reducer shell, wherein the differential assembly comprises a differential locking and disconnecting function module; the differential locking and disconnecting function module comprises an execution motor, a shift fork assembly, a coupling sleeve, a gear ring, a half shaft flange and a left half shaft gear; the execution motor is used for driving the shift fork assembly to rotate, and then driving the coupling sleeve to be located at three different positions of a left position, a middle position and a right position, so as to realize the functions of differential, locking and disconnecting. The multifunctional speed reducer assembly further comprises an electronic P-gear function module, which can realize the locking and unlocking functions of the P-gear. Compared with the prior art, the application can simultaneously meet the multifunctional special requirements of the ordinary differential function, the locking function in the escape, the reverse drag disconnecting function in the single drive and the P-gear parking function of the four-wheel drive off-road vehicle, and has the advantages of small size and high reliability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of speed reducer, and particularly relates to a multifunctional speed reducer assembly. BACKGROUND

[0002] In addition to the ordinary differential function, part of four-wheel drive off-road vehicles also require the speed reducer to have a differential locking function to meet the escape needs when the wheels slip in special terrain, and also require the speed reducer to be able to disconnect the power transmission of the non-drive axle when the four-wheel drive vehicle is driven by a single axle to solve the efficiency loss caused by the reverse dragging of the non-drive axle transmission. In addition, the speed reducer is also required to have an electronic P-gear function to ensure the safety of the off-road vehicle when parking on a slope.

[0003] In the prior art, Chinese Patent Publication No. CN104879464A discloses a speed reducer for a pure electric vehicle, which mainly consists of a box body, a box cover, an input shaft component, an intermediate shaft component, and an output shaft component. The input gear of the input shaft component is fixed on the input shaft, which is engaged with the intermediate shaft input gear of the intermediate shaft component. The intermediate shaft output gear coaxially connected with the intermediate shaft input gear is engaged with the output gear of the output component. The output shaft component is provided with a differential integrated with the output gear. The left and right half shaft gears of the differential are respectively connected with the respective output shafts. A P-gear target wheel is installed on the intermediate shaft of the intermediate shaft component, and the P-gear target wheel cooperates with the locking block of the P-gear locking mechanism and is locked after being combined. The input shaft of the input shaft component, the intermediate shaft of the intermediate shaft component, and the left and right output shafts of the output component are respectively installed on the box body and the box cover through the respective bearings.

[0004] The deficiency of the prior art is that the speed reducer for a pure electric vehicle is a common speed reducer with a P-gear structure, which has fewer functions and cannot simultaneously have the functions of differential, differential locking, disconnection, and automatic parking, thereby failing to meet the needs of four-wheel drive off-road vehicles. SUMMARY

[0005] (I) Technical problem to be solved

[0006] Therefore, the present application provides a multifunctional speed reducer assembly, which aims to solve the technical problem that the speed reducer for an electric vehicle in the prior art cannot simultaneously have the functions of differential, differential locking, disconnection, and automatic parking.

[0007] (II) Technical scheme

[0008] To solve the above technical problems, the application provides a multifunctional speed reducer assembly which comprises a differential assembly and a speed reducer shell used for containing the differential assembly, and the differential assembly comprises a differential locking and disconnecting function module; the differential locking and disconnecting function module comprises an executing motor, a shift fork assembly, a combination sleeve, a gear ring, a half shaft flange and a left half shaft gear; the middle part of the shift fork assembly is hinged to the speed reducer shell through a hinge shaft, one end of the shift fork assembly is connected with the executing motor, the other end of the shift fork assembly is connected with the combination sleeve, the executing motor is used for driving the shift fork assembly to rotate around the hinge shaft, and then the combination sleeve is driven to be located at three different positions, i.e. a left position, a middle position and a right position; the combination sleeve comprises combination sleeve inner meshing teeth and combination sleeve outer meshing teeth, the left half shaft gear comprises left half shaft gear outer meshing teeth, the half shaft flange comprises half shaft flange outer meshing teeth, and the gear ring comprises gear ring inner meshing teeth; when the combination sleeve is located at the middle position, the combination sleeve inner meshing teeth are meshed with the left half shaft gear outer meshing teeth and the half shaft flange outer meshing teeth at the same time, and the left half shaft gear is linked with the half shaft flange; when the combination sleeve is located at the right position, the combination sleeve inner meshing teeth are meshed with the left half shaft gear outer meshing teeth and the half shaft flange outer meshing teeth at the same time, the combination sleeve outer meshing teeth are meshed with the gear ring inner meshing teeth, and the left half shaft gear, the half shaft flange and the gear ring are linked with each other; when the combination sleeve is located at the left position, the combination sleeve inner meshing teeth are only meshed with the left half shaft gear outer meshing teeth; the multifunctional speed reducer assembly further comprises an input shaft assembly and an intermediate shaft assembly, the input shaft assembly transmits power to the intermediate shaft assembly, and the intermediate shaft assembly transmits power to the differential assembly, wherein the intermediate shaft assembly comprises a second intermediate transmission gear, the gear ring is meshed with the second intermediate transmission gear, the input shaft assembly comprises an input shaft, and the multifunctional speed reducer assembly further comprises an electronic P-gear function module, the electronic P-gear function module comprises a brake tooth, a brake claw, a first push piece, a second push piece, a P-gear motor and a controller thereof, the brake tooth is fixedly installed on the input shaft, the P-gear motor is connected with the second push piece, a spring is arranged between the first push piece and the second push piece, the first push piece abuts against the brake claw, the P-gear motor is controlled by the controller to drive the second push piece to rotate, the second push piece transmits force to the first push piece through the spring, the first push piece drives the brake claw to be clamped into or separated from the brake tooth, and thus the locking and unlocking functions of the P-gear are realized.

[0009] Preferably, the input shaft assembly, the intermediate shaft assembly and the differential assembly jointly form a parallel shaft type two-stage speed reduction structure, and the speed reducer shell is further used for containing the input shaft assembly and the intermediate shaft assembly.

[0010] Preferably, the speed reducer shell comprises a front shell and a rear shell which is buckled with the front shell, and the hinge shaft is fixed to the front shell or the rear shell.

[0011] Preferably, the P-gear motor comprises a P-gear motor output shaft, the P-gear motor output shaft is connected with the second push piece, and an angle sensor device is arranged on the P-gear motor output shaft.

[0012] Preferably, an angle sensor device is arranged on the shift fork assembly.

[0013] Preferably, one end of the input shaft is a power input end, the power input end extends out of the reducer housing, and the power input end is provided with external spline teeth; the differential assembly further comprises a right half shaft gear, and the half shaft flange and the right half shaft gear are respectively provided with internal spline teeth.

[0014] Preferably, one end of the half shaft flange is mounted on the reducer housing through a bearing.

[0015] Preferably, the coupling sleeve, the gear ring, the left half shaft gear and the right half shaft gear are coaxially arranged, and the half shaft flange, the left half shaft gear and the gear ring are arranged in sequence, the coupling sleeve is sleeved outside the half shaft flange, and the coupling sleeve is provided with a recessed shifting groove for the shift fork assembly to extend into.

[0016] Preferably, a recessed step snap ring is arranged on the outer wall of one end of the left half shaft gear close to the half shaft flange, a recessed step snap groove is arranged on the inner wall of one end of the half shaft flange close to the left half shaft gear, and the step snap ring extends into the step snap groove.

[0017] Preferably, a wear-resistant ring is arranged between the step snap ring and the step snap groove.

[0018] (Three) beneficial effects

[0019] Compared with the prior art, the beneficial effects of the multifunctional reducer assembly of the present application mainly include:

[0020] The multifunctional reducer assembly of the present application is an invention and creation for the special requirements of four-wheel drive off-road vehicles. It can simultaneously meet the special requirements of four-wheel drive off-road vehicles for differential function, locking function when getting out of trouble, and disconnecting function when single driving. The locking and disconnecting modules adopt a motor shift fork pushing type, which is small in size and high in reliability. The electronic P-gear module can make parking more secure and reliable, and the structure is small in size and high in reliability. BRIEF DESCRIPTION OF DRAWINGS

[0021] The features and advantages of the present application will be more clearly understood through reference to the following detailed description and drawings, which are illustrative and should not be construed as limiting the present application, in which:

[0022] Figure 1 is a part structure perspective view of the multifunctional reducer assembly of the embodiment of the present application;

[0023] Figure 2The schematic diagram of shaft layout of the multifunctional speed reducer assembly of the embodiment of the present application;

[0024] Figure 3 The schematic diagram of the structure of the differential assembly in the multifunctional speed reducer assembly of the embodiment of the present application;

[0025] Figure 4 The schematic diagram of the structure of the multifunctional speed reducer assembly of the embodiment of the present application in the ordinary differential state (also the sectional view along the line A-A in the figure) ; Figure 3

[0026] Figure 5 The schematic diagram of the structure of the multifunctional speed reducer assembly of the embodiment of the present application in the differential lock state;

[0027] Figure 6 The schematic diagram of the structure of the multifunctional speed reducer assembly of the embodiment of the present application in the disconnected state.

[0028] Explanation of reference signs:

[0029] 11. brake tooth, 12. brake claw, 13. first push piece, 14. second push piece, 15. P block motor;

[0030] 21. left half axle gear, 22. half axle flange, 23. coupling sleeve, 24. gear ring, 25. shift yoke assembly, 26. execution motor;

[0031] 31. left half axle gear outer engagement tooth, 32. half axle flange outer engagement tooth, 33. coupling sleeve inner engagement tooth, 34. coupling sleeve outer engagement tooth, 35. gear ring inner engagement tooth;

[0032] 41. front housing, 42. rear housing, 43. input shaft assembly, 44. intermediate shaft assembly, 45. differential assembly;

[0033] 5. wear ring. DETAILED DESCRIPTION

[0034] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] ​In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements, or it can be "drivenly connected", that is, power connection through various suitable ways such as belt drive, gear drive or chain wheel drive. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The following will be described in conjunction with the accompanying drawings Figures 1-6 The multifunctional speed reducer assembly of the present application is further described.

[0037] The application discloses a multifunctional speed reducer assembly, which comprises a differential assembly 45 and a speed reducer shell for containing the differential assembly 45, and the differential assembly 45 comprises a differential locking and disconnecting function module; the differential locking and disconnecting function module comprises an executing motor 26, a shift fork assembly 25, a combination sleeve 23, a gear ring 24, a half shaft flange 22 and a left half shaft gear 21; the middle part of the shift fork assembly 25 is hinged to the speed reducer shell through a hinge shaft, the executing motor 26 is connected with one end of the shift fork assembly 25, the other end of the shift fork assembly 25 is connected with the combination sleeve 23, the executing motor 26 is used for driving the shift fork assembly 25 to rotate around the hinge shaft, and then the combination sleeve 23 is driven to be located at three different positions of a left position, a middle position and a right position; the combination sleeve 23 comprises combination sleeve inner meshing teeth 33 and combination sleeve outer meshing teeth 34, the left half shaft gear 21 comprises left half shaft gear outer meshing teeth 31, the half shaft flange 22 comprises half shaft flange outer meshing teeth 32, and the gear ring 24 comprises gear ring inner meshing teeth 35; when the combination sleeve 23 is at the middle position, the combination sleeve inner meshing teeth 33 are meshed with the left half shaft gear outer meshing teeth 31 and the half shaft flange outer meshing teeth 32 simultaneously, and the left half shaft gear 21 is linked with the half shaft flange 22; when the combination sleeve 23 is at the right position, the combination sleeve inner meshing teeth 33 are meshed with the left half shaft gear outer meshing teeth 31 and the half shaft flange outer meshing teeth 32 simultaneously, the combination sleeve outer meshing teeth 34 are meshed with the gear ring inner meshing teeth 35, and the left half shaft gear 21, the half shaft flange 22 and the gear ring 24 are linked together; when the combination sleeve 23 is at the left position, the combination sleeve inner meshing teeth 33 are only meshed with the left half shaft gear outer meshing teeth 31; the multifunctional speed reducer assembly further comprises an input shaft assembly 43 and an intermediate shaft assembly 44, the input shaft assembly 43 transmits power to the intermediate shaft assembly 44, and the intermediate shaft assembly 44 transmits power to the differential assembly 45, wherein the intermediate shaft assembly 44 comprises a second intermediate transmission gear, and the gear ring 24 is meshed with the second intermediate transmission gear; the input shaft assembly 43 comprises an input shaft; the multifunctional speed reducer assembly further comprises an electronic P-gear function module, the electronic P-gear function module comprises a brake tooth 11, a brake claw 12, a first push piece 13, a second push piece 14 and a P-gear motor 15 and a controller thereof, the brake tooth 11 is fixedly installed on the input shaft, the P-gear motor 15 is connected with the second push piece 14, a spring is installed between the first push piece 13 and the second push piece 14, the first push piece 13 abuts against the brake claw 12, the P-gear motor 15 is driven to rotate by the controller, the second push piece 14 transmits force to the first push piece 13 through the spring, the first push piece 13 drives the brake claw 12 to be clamped into or out of the brake tooth 11, and thus the locking and unlocking functions of the P-gear are realized.

[0038] More specifically, the input shaft assembly 43, the intermediate shaft assembly 44 and the differential assembly 45 jointly constitute a parallel shaft type two-stage speed reduction structure, and the speed reducer shell is further used for containing the input shaft assembly 43 and the intermediate shaft assembly 44.

[0039] More specifically, the reducer housing includes a front housing 41 and a rear housing 42 engaged with the front housing 41 , and the hinge shaft is fixed to the front housing 41 or the rear housing 42 .

[0040] More specifically, the coupling sleeve 23, the ring gear 24, the left half-shaft gear 21, and the right half-shaft gear are coaxially arranged, and the half-shaft flange 22, the left half-shaft gear 21 and the ring gear 24 are arranged in sequence. The coupling sleeve 23 is sleeved on the outside of the half-shaft flange 22, and a recessed shift groove is provided on the coupling sleeve 23 for the shift fork assembly 25 to extend into.

[0041] Please focus on Figure 3 The multifunctional reducer assembly of this embodiment is a parallel shaft two-stage reduction structure as a whole, and the power transmission route is: input shaft assembly 43 → intermediate shaft assembly 44 → differential assembly 45, and power is transmitted through two pairs of gears.

[0042] The multifunctional speed reducer assembly of this embodiment has the differential lock, disconnection function and electronic P gear function at the same time.

[0043] In the differential assembly 45 , the controller controls the actuator motor 26 to rotate the shift fork assembly 25 , which in turn drives the coupling sleeve 23 to move to three different positions, thereby achieving the differential, locking, and disconnect functions. The following details the three functions of the differential locking and disconnect function module.

[0044] (1) When the coupling sleeve 23 is in the middle position ( Figure 4 The left side shaft gear 21 is engaged with the left side shaft gear 21 and the side shaft flange 22 (i.e., the left side shaft gear 21 and the side shaft flange 22 are linked together), thereby realizing a normal differential function under the action of the differential.

[0045] (2) When the coupling sleeve 23 is located at the right position ( Figure 5 As shown in the position, the inner meshing teeth 33 of the coupling sleeve mesh with the outer meshing teeth 31 of the left half-shaft gear and the outer meshing teeth 32 of the half-shaft flange at the same time, and the outer meshing teeth 34 of the coupling sleeve mesh with the inner meshing teeth 35 of the ring gear, thereby locking the left half-shaft gear 21 and the ring gear 24 and transmitting power to the half-shaft flange 22. The left and right half-shafts of the differential no longer have a differential speed and can only rotate at the same speed, thus realizing the differential locking function.

[0046] (3) When the coupling sleeve 23 is located at the left position ( Figure 6 As shown in the position, the power transmission between the left half-shaft gear 21 and the half-shaft flange 22 is interrupted, realizing the differential disconnection function.

[0047] In the electronic P-gear function module, the P-gear motor 15 drives the mechanical actuator to rotate, and then pushes the brake pawl 12 to be clamped into or out of the brake gear 11 installed on the input shaft of the speed reducer, so as to realize the locking and unlocking functions of the P-gear.

[0048] The multifunctional speed reducer assembly of the present application is an invention and creation for the special requirements of the four-wheel drive off-road vehicle, and can simultaneously meet the special requirements of the four-wheel drive off-road vehicle for the differential function, the locking function in the escape, and the disconnecting function in the single drive. The locking and disconnecting module adopts the motor yoke pushing type, has small volume and high reliability, the electronic P-gear module can make the parking more safe and reliable, and has small structure volume and high reliability.

[0049] In the above embodiment, the yoke assembly 25 includes a sleeve which is a whole annular ring, the hinge shaft extends into the sleeve, the two ends of the sleeve are respectively provided with an upper yoke rod and a lower yoke rod, the upper yoke rod is connected with the execution motor 26, and the lower yoke rod is clamped with the combination sleeve. The execution motor 26 is used for providing reciprocating linear power.

[0050] According to the specific embodiment of the present application, the P-gear motor 15 includes a P-gear motor output shaft, the P-gear motor output shaft is connected with the second push piece 14, and an angle sensor device is arranged on the P-gear motor output shaft. In the embodiment, the angle sensor device is used for accurately controlling the position of the brake pawl 12.

[0051] According to the specific embodiment of the present application, an angle sensor device is arranged on the yoke assembly 25. In the embodiment, the angle sensor device is used for accurately controlling the position of the combination sleeve 23.

[0052] According to the specific embodiment of the present application, one end of the input shaft is a power input end, the power input end extends out of the speed reducer shell, and the power input end is provided with external spline teeth; the differential assembly 45 further includes a right half shaft gear, and the half shaft flange 22 and the right half shaft gear are respectively provided with internal spline teeth. In the embodiment, the power is input through the spline of the input shaft, output through the half shaft flange 22 and the right half shaft gear of the differential, and transmitted to the wheels.

[0053] According to the specific embodiment of the present application, one end of the half shaft flange 22 is installed on the speed reducer shell through a bearing.

[0054] More specifically, the bearing is installed on the outer side of one end of the half shaft flange 22, and the inner side of one end of the half shaft flange 22 is provided with internal spline teeth.

[0055] In the embodiment, the structure of the internal spline teeth facilitates the power output of the half shaft flange 22, the bearing is installed outside, which is beneficial to the smooth rotation of the half shaft flange 22. The one-internal-and-one-external structure can guarantee that the above two functions are simultaneously met and the structure is compact.

[0056] According to the specific embodiment of the present application, the left half shaft gear 21 is provided with a recessed step snap ring near the outer wall of one end of the half shaft flange 22, the half shaft flange 22 is provided with a recessed step snap groove near the inner wall of one end of the left half shaft gear 21, and the step snap ring extends into the step snap groove. In this embodiment, the structure can improve the coaxiality of the left half shaft gear 21 and the half shaft flange 22, and is beneficial to the smooth position change of the combination sleeve 23.

[0057] According to the specific embodiment of the present application, a wear-resistant ring 5 is arranged between the step snap ring and the step snap groove. In this embodiment, the use of the wear-resistant ring 5 can avoid direct friction between the left half shaft gear 21 and the half shaft flange 22, and can avoid wear.

[0058] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A multi-function speed reducer assembly, characterized by, The differential assembly (45) comprises a differential lock and disconnection function module; the differential lock and disconnection function module comprises an executing motor (26), a yoke assembly (25), a combination sleeve (23), a gear ring (24), a half shaft flange (22) and a left half shaft gear (21); the middle part of the yoke assembly (25) is hinged to the reducer shell through a hinge shaft, one end of the yoke assembly (25) is connected with the executing motor (26), the other end of the yoke assembly (25) is connected with the combination sleeve (23), the executing motor (26) is used for driving the yoke assembly (25) to rotate around the hinge shaft, thereby driving the combination sleeve (23) to be located at three different positions of left position, middle position and right position; the combination sleeve (23) comprises combination sleeve inner meshing teeth (33) and combination sleeve outer meshing teeth (34), the left half shaft gear (21) comprises left half shaft gear outer meshing teeth (31), the half shaft flange (22) comprises half shaft flange outer meshing teeth (32), and the gear ring (24) comprises gear ring inner meshing teeth (35); when the combination sleeve (23) is at the middle position, the combination sleeve inner meshing teeth (33) are meshed with the left half shaft gear outer meshing teeth (31) and the half shaft flange outer meshing teeth (32) at the same time, and the left half shaft gear (21) is linked with the half shaft flange (22); when the combination sleeve (23) is at the right position, the combination sleeve inner meshing teeth (33) are meshed with the left half shaft gear outer meshing teeth (31) and the half shaft flange outer meshing teeth (32) at the same time, and the combination sleeve outer meshing teeth (34) are meshed with the gear ring inner meshing teeth (35), and the left half shaft gear (21), the half shaft flange (22) and the gear ring (24) are linked together; when the combination sleeve (23) is at the left position, the combination sleeve inner meshing teeth (33) are only meshed with the left half shaft gear outer meshing teeth (31); the multifunctional reducer assembly further comprises an input shaft assembly (43) and an intermediate shaft assembly (44), the input shaft assembly (43) transmits power to the intermediate shaft assembly (44), and the intermediate shaft assembly (44) transmits power to the differential assembly (45); the intermediate shaft assembly (44) comprises a second intermediate transmission gear, and the gear ring (24) is meshed with the second intermediate transmission gear; the input shaft assembly (43) comprises an input shaft, and the multifunctional reducer assembly further comprises an electronic P-gear function module; the electronic P-gear function module comprises a brake tooth (11), a brake claw (12), a first push piece (13), a second push piece (14) and a P-gear motor (15) and a controller thereof, and the brake tooth (11) is fixedly installed on the input shaft.The P-gear motor (15) is connected with the second push piece (14), springs are installed between the first push piece (13) and the second push piece (14), the first push piece (13) is in abutment with the brake claw (12), the P-gear motor (15) drives the second push piece (14) to rotate through the controller, the second push piece (14) transmits force to the first push piece (13) through the springs, and the first push piece (13) pushes the brake claw (12) to be clamped into or out of the brake tooth (11), so that the locking and unlocking functions of the P-gear are realized. The shifting fork assembly (25) comprises a sleeve in the shape of a whole ring, a hinge shaft extends into the sleeve, the two ends of the sleeve are respectively provided with an upper fork rod and a lower fork rod, the upper fork rod is connected with an execution motor (26), the lower fork rod is connected with a coupling sleeve, and the execution motor (26) is used for providing reciprocating linear power.

2. The multi-functional underdrive assembly of claim 1, wherein, The input shaft assembly (43), the intermediate shaft assembly (44) and the differential assembly (45) jointly constitute a parallel shaft type two-stage speed reduction structure, and the reducer housing is also used for accommodating the input shaft assembly (43) and the intermediate shaft assembly (44).

3. The multi-functional underdrive assembly of claim 2, wherein, The reducer housing comprises a front housing (41) and a rear housing (42) buckled with the front housing (41), and the hinge shaft is fixed on the front housing (41) or the rear housing (42).

4. The multi-functional underdrive assembly of claim 3, wherein, The P-gear motor (15) comprises a P-gear motor output shaft connected with the second push piece (14), and an angle sensor device is arranged on the P-gear motor output shaft.

5. The multi-functional underdrive assembly of claim 4, wherein, An angle sensor device is arranged on the shifting fork assembly (25).

6. The multi-functional underdrive assembly of claim 5, wherein, One end of the input shaft is a power input end, the power input end extends out of the reducer housing, and the power input end is provided with external spline teeth; the differential assembly (45) further comprises a right half shaft gear, and the half shaft flange (22) and the right half shaft gear are respectively provided with internal spline teeth.

7. The multi-functional underdrive assembly of claim 6, wherein, One end of the half shaft flange (22) is mounted on the reducer housing through a bearing.

8. The multi-functional underdrive assembly of claim 7, wherein, The coupling sleeve (23), the gear ring (24), the left half shaft gear (21) and the right half shaft gear are coaxially arranged, and the half shaft flange (22), the left half shaft gear (21) and the gear ring (24) are arranged in sequence, the coupling sleeve (23) is sleeved outside the half shaft flange (22), and the coupling sleeve (23) is provided with a recessed shifting groove for the shifting fork assembly (25) to extend into.

9. The multi-functional underdrive assembly of claim 8, wherein, The left half shaft gear (21) is provided with a recessed step snap ring on the outer wall of one end close to the half shaft flange (22), the half shaft flange (22) is provided with a recessed step snap groove on the inner wall of one end close to the left half shaft gear (21), and the step snap ring extends into the step snap groove.

10. The multi-functional underdrive assembly of claim 9, wherein, A wear-resistant ring (5) is arranged between the step snap ring and the step snap groove.

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