Differential mechanism

Abstract

The differential mechanism comprises a shaft pin, a main gear and retainers, the main gear comprises a limiting part penetrating in the axial direction of the main gear, the retainers comprise the first retainer formed through forging and the second retainer formed through punching, and the first retainer and the second retainer are located on the two axial sides of the main gear correspondingly and welded to the main gear. Wherein the first retainer is provided with a matching part extending in the axial direction of the main gear, the matching part is provided with an installation groove, the installation groove extends in the radial direction of the main gear, the shaft pin is installed in the installation groove, the limiting part is connected with the matching part in a sleeved mode, and the matching part is welded to the inner wall of the limiting part. According to the embodiment of the invention, the mounting groove is located in the first retainer, that is, the first retainer is connected with the shaft pin, and compared with the manner that the mounting groove is directly formed in the main gear, the complexity in the main gear can be reduced, so that the production difficulty and cost of the main gear are reduced, and actual production requirements are better met.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle transmissions, in particular to a differential. Background Art

[0002] The differential is a device used to adjust the speed of the wheels on both sides of the car when turning. The differential generally includes a cage and a main gear. The main gear is usually provided with a matching groove for installing an axle pin. However, the installation of the axle pin on the main gear makes the internal contour of the gear more complex and the tolerance smaller, which increases the cost and difficulty of production. Summary of the invention

[0003] The present application provides a differential for solving the problem that the internal profile of the gear is more complicated and the tolerance is smaller when the axle pin is installed on the main gear, thereby increasing the cost and difficulty of production.

[0004] The embodiment of the present application provides a differential, the differential includes an axle pin, a main gear and a retaining frame, the main gear includes a limiting portion penetrating along the axial direction of the main gear, the retaining frame includes a forged first retaining frame and a stamped second retaining frame, the first retaining frame and the second retaining frame are respectively located on both sides of the axial direction of the main gear, and are both welded to the main gear. Wherein, the first retaining frame has a matching portion extending along the axial direction of the main gear, the matching portion is provided with an installation groove, the installation groove extends along the radial direction of the main gear, the axle pin is installed in the installation groove, the limiting portion is sleeved with the matching portion, and the matching portion is welded to the inner wall of the limiting portion.

[0005] Specifically, the axle pin is used to transmit the torque on both sides of the main gear, and the mounting groove of the first retaining frame is used to fix the axle pin. In the embodiment of the present application, the mounting groove is located in the first retaining frame, that is, the first retaining frame is connected to the axle pin. Compared with the mounting groove directly set on the main gear, it can reduce the complexity of the inside of the main gear, thereby reducing the production difficulty and cost of the main gear, and better meeting the actual production needs.

[0006] In the embodiment of the present application, along the radial direction of the main gear, the installation groove is a rectangular groove, and the cross-section of the shaft pin along the direction perpendicular to its own axis is a rectangle, that is, the shaft pin is a square shaft pin.

[0007] Therefore, the rectangular groove is arranged at one end of the first retaining frame close to the second retaining frame and extends to the side away from the second retaining frame, that is, the square axle pin can be directly placed in the square groove along the axis of the main gear, which is more convenient for the assembly of the square axle pin. At the same time, the square axle pin is matched and connected with the rectangular groove so that the connecting parts of the two fit tightly, so as to improve the reliability of the connection between the first retaining frame and the axle pin.

[0008] In an embodiment of the present application, two mounting grooves are provided in the fitting portion. The mounting grooves are located on opposite sides of the fitting portion along the radial direction of the main gear, that is, both ends of the square shaft pin along the axis can be mounted in the two mounting grooves. The inner walls on both sides of the mounting groove along the radial direction of the main gear can abut against the square shaft pin to limit the radial movement of the square shaft pin along the main gear, which is beneficial to improving the reliability of the connection between the square shaft pin and the first cage. At the same time, the square shaft pin is located on the central axis of the first cage, which is beneficial to improving the stability of the transmission torque.

[0009] In an embodiment of the present application, at least one of the mounting grooves penetrates the fitting portion along the radial direction of the main gear. Therefore, the mounting groove that penetrates the fitting portion along the radial direction of the main gear can be formed in one processing, which is convenient for processing and better meets the actual production requirements.

[0010] In an embodiment of the present application, at least one of the mounting grooves penetrates the fitting portion along the axial direction of the main gear so that the shaft pin can be mounted in the mounting groove along the axial direction of the main gear. Therefore, it is beneficial to improve the convenience of mounting the shaft pin on the first cage.

[0011] In an embodiment of the present application, along the radial direction of the main gear, the mounting groove is a circular groove, the cross-section of the shaft pin perpendicular to its own axial direction is circular, and at least one of the mounting grooves penetrates the fitting portion along the radial direction of the main gear, that is, the shaft pin is a circular shaft pin.

[0012] Therefore, the circular shaft pin is easier to be processed and formed in actual production. Selecting the circular shaft pin is beneficial to cost saving. At least one mounting groove penetrates the fitting portion along the radial direction of the main gear, that is, the circular shaft pin can be assembled along the radial direction of the main gear, ensuring the feasibility of the circular shaft pin for the first cage.

[0013] In an embodiment of the present application, two mounting grooves are provided in the fitting portion. The mounting grooves are located on opposite sides of the fitting portion along the radial direction of the main gear. That is, both ends of the circular shaft pin along the axis can be mounted in the two mounting grooves. The inner wall of the circular groove can be in circumferential abutment with the circular shaft pin to limit the circumferential movement of the circular shaft pin, further improving the reliability of the circular shaft pin mounted on the first cage. At the same time, the circular shaft pin is located on the central axis of the first cage, which is beneficial to improving the stability of the transmission torque.

[0014] In an embodiment of the present application, the first cage has a boss, the boss is located on the outer wall of the fitting portion and is arranged along the circumferential direction of the fitting portion. The main gear has a first protruding portion, the first protruding portion protrudes along the axial direction of the main gear and is arranged along the axial direction of the limiting portion. Along the circumferential direction of the main gear, the boss can be in abutment with the first protruding portion.

[0015] Therefore, the circumferential outer wall of the boss can abut against and be welded to the side wall of the first convex portion along the circumferential direction of the main gear, so as to limit the circumferential movement of the first cage along the main gear, improve the reliability of the first cage acting on the differential. At the same time, the boss can play a role in precise positioning during the assembly process of the main gear and the first cage, thus making the assembly process simpler and meeting the actual production requirements.

[0016] In the embodiment of the present application, the main gear further has a second convex portion, which protrudes along the radial direction of the main gear and is arranged along the circumferential direction of the limiting portion. Along the axial direction of the main gear, the boss can abut against the second convex portion.

[0017] Therefore, the end face of the boss close to the second cage can abut against and be welded to the end face of the second convex portion, so as to limit the movement of the first cage along the axial direction of the main gear towards the second cage, that is, to limit the axial movement of the first cage along the main gear, and improve the reliability of the first cage acting on the differential.

[0018] In the embodiment of the present application, the differential further includes side gears, planet gears and gaskets. The first cage and the second cage enclose an installation cavity, and the side gears, the planet gears and the gaskets are installed in the installation cavity.

[0019] Specifically, the differential includes two planet gears opposite to each other along the radial direction of the main gear and two side gears opposite to each other along the axial direction of the main gear. The planet gears are sleeved on both ends of the axle pin along the radial direction of the main gear, and the side gears are located on both sides of the axle pin along the axial direction of the main gear, that is, one side gear is located inside the first cage and one side gear is located inside the second cage, and the planet gears can mesh with each side gear. The planet gears can rotate self - rotatably, that is, the planet gears can rotate around the axle pin, and at the same time, the planet gears can rotate around the axis of the side gear, that is, the planet gears can revolve. When the differential works, during the meshing process of the planet gears and the side gears, the planet gears rotate self - rotatably on the basis of revolving, so that the two sides along the radial direction of the main gear have different rotational speeds.

[0020] Among them, the differential further includes a first gasket and a second gasket. The first gasket is used for sleeving one side of the planet gear close to the mating portion, so that the planet gear does not directly contact the mating portion during rotation. The second gasket is used for sleeving one side of the side gear close to the cage, so that the side gear does not directly contact the inside of the cage during rotation, thereby reducing the risk of cage wear and being beneficial to improving the service life of the differential.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. Description of the Drawings

[0022] Figure 1Schematic diagram of the differential provided in this application in a specific embodiment;

[0023] Figure 2 is Figure 1 exploded view of the main gear and the cage in;

[0024] Figure 3 is Figure 1 front view of the first cage with a rectangular mounting groove in;

[0025] Figure 4 is Figure 1 front view of another first cage with a rectangular mounting groove in;

[0026] Figure 5 is Figure 1 schematic diagram of the structure of the first cage with a circular mounting groove in;

[0027] Figure 6 is Figure 4 exploded view of the first cage cooperating with the main gear having a first protrusion and a second protrusion in;

[0028] Figure 7 is Figure 5 exploded view of the first cage cooperating with the main gear having a first protrusion and a second protrusion in;

[0029] Figure 8 is Figure 3 exploded view of the first cage installed in the differential in;

[0030] Figure 9 is Figure 4 exploded view of the first cage installed in the differential in;

[0031] Figure 10 is Figure 3 schematic diagram of the cooperation between the first cage and the planetary gear in;

[0032] Figure 11 is Figure 4 schematic diagram of the cooperation between the first cage and the planetary gear in;

[0033] Figure 12 is Figure 3 schematic diagram of the cooperation between the first cage and the side gear in;

[0034] Figure 13 is Figure 4 schematic diagram of the cooperation between the first cage and the side gear in.

[0035] Explanation of reference numerals:

[0036] 1 - Differential;

[0037] 11 - Main gear;

[0038] 111 - Limiting portion;

[0039] 112 - First convex portion;

[0040] 113 - Second convex portion;

[0041] 12 - First cage;

[0042] 121 - Fitting portion;

[0043] 122 - Installation groove;

[0044] 123 - Boss;

[0045] 13 - Second cage;

[0046] 14 - Side gear;

[0047] 15 Planet gear;

[0048] 16 - Gasket;

[0049] 18 - Axle pin.

[0050] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application. Detailed implementation manners

[0051] To better understand the technical solutions of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0052] In a specific embodiment, the present application will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0053] The embodiment of this application provides a differential 1, as Figure 1 , Figure 2 and Figure 3 shown, the differential 1 includes an axle pin 18, a main gear 11 and a cage. The main gear 11 includes a limiting portion 111 that axially penetrates along the main gear 11. The cage includes a first cage 12 formed by forging and a second cage 13 formed by stamping. The first cage 12 and the second cage 13 are respectively located on both axial sides of the main gear 11 and are both welded to the main gear 11. Among them, the first cage 12 has a fitting portion 121 extending along the axial direction of the main gear 11. The fitting portion 121 is provided with an installation groove 122. The installation groove 122 extends along the radial direction of the main gear 11. The axle pin 18 is installed in the installation groove 122. The limiting portion 111 is sleeved with the fitting portion 121, and the fitting portion 121 is welded to the inner wall of the limiting portion 111.

[0054] Specifically, the shaft pin 18 is used to transmit the torque on both sides of the main gear 11. The installation groove 122 of the first cage 12 is used to fix the shaft pin 18. In the embodiment of the present application, the installation groove 122 is located in the first cage 12, that is, the first cage 12 is connected to the shaft pin 18. Compared with the installation groove 122 being directly arranged on the main gear 11, the complexity inside the main gear 11 can be reduced, thereby reducing the production difficulty and cost of the main gear 11, and better meeting the actual production requirements.

[0055] As Figure 2 shown, the limiting portion 111 is an annular cavity arranged circumferentially along the center of the main gear 11. The first cage 12 and the second cage 13 are both installed on the main gear 11. The outer wall of the mating portion 121 can abut against the inner wall of the limiting portion 111, that is, the limiting portion 111 is sleeved on the outside of the mating portion 121, so that the mating portion 121 and the limiting portion 111 are welded, thereby being used for the fixed connection between the first cage 12 and the main gear 11. The two ends of the shaft pin 18 along the axial direction are welded to the installation groove 122 to improve the reliability of the shaft pin 18 installed on the first cage 12.

[0056] In addition, the second cage 13 has a welding portion on the side close to the first cage 12. The welding portion can extend axially into the limiting portion 111 along the main gear 11 and can be welded to the inner wall of the limiting portion 111, thereby being used for the fixed connection between the second cage 13 and the main gear 11.

[0057] In this embodiment, the first cage 12 is formed by forging. The forged first cage 12 is relatively thick, so there is machining allowance, and it can be machined again according to the actual situation to finely adjust the specific structure of the first cage 12, that is, the width of the mating portion 121 along the axial direction of the main gear 11 can be adjusted, so that the distance between the first cage 12 and the second cage 13 along the axial direction of the spur gear can be adjusted to adapt to different structures of the differential 1. At the same time, the cage formed by forging can further reduce the production cost and difficulty compared with the cage formed by stamping. The second cage 13 is processed by stamping. The second cage 13 formed by this method has the advantages of high surface quality, high forming efficiency, and high material utilization rate.

[0058] In a possible implementation manner, as Figure 3 shown, along the radial direction of the main gear 11, the installation groove 122 is a rectangular groove, and the cross-section of the shaft pin 18 perpendicular to its own axial direction is rectangular, that is, the shaft pin 18 is a square shaft pin.

[0059] Therefore, the rectangular groove is arranged at one end of the first retaining frame 12 close to the second retaining frame 13 and extends to the side away from the second retaining frame 13, that is, the square axle pin can be directly placed in the square groove along the axis of the main gear 11, which is more convenient for the assembly of the square axle pin. At the same time, the square axle pin is connected with the rectangular groove so that the connecting parts of the two fit tightly, so as to improve the reliability of the connection between the first retaining frame 12 and the axle pin 18.

[0060] In the above embodiment, Figure 3 As shown, the mating portion 121 is provided with two mounting grooves 122, and the mounting grooves 122 are located on opposite sides of the mating portion 121 along the radial direction of the main gear 11, that is, both ends of the square shaft pin along the axis can be installed in the two mounting grooves 122, and the inner walls of the mounting grooves 122 on both sides along the radial direction of the main gear 11 can abut against the square shaft pin, which is used to limit the radial movement of the square shaft pin along the main gear 11, which is beneficial to improve the reliability of the connection between the square shaft pin and the first retaining frame 12. At the same time, the square shaft pin is located on the central axis of the first retaining frame 12, which is beneficial to improve the stability of the transmission torque.

[0061] In a possible implementation, the mounting grooves 122 may be disposed at two ends of the main gear 11 along the radial offset, that is, the square shaft pins are located on both sides of the central axis of the first retaining frame 12 .

[0062] In a possible implementation, Figure 4 As shown, at least one mounting groove 122 penetrates the matching portion 121 along the radial direction of the main gear 11. Therefore, the mounting groove 122 that penetrates the matching portion 121 along the radial direction of the main gear 11 can be formed in one step, which is convenient for processing and better meets actual production needs.

[0063] In a possible implementation, Figure 3 As shown, at least one installation groove 122 passes through the matching portion 121 along the axial direction of the main gear 11, so that the shaft pin 18 can be installed in the installation groove 122 along the axial direction of the main gear 11. Therefore, it is beneficial to improve the convenience of installing the shaft pin 18 on the first retaining frame 12.

[0064] Specifically, along the axial direction of the main gear 11, the width of the matching portion 121 is greater than the width of the square shaft pin, so that the square shaft pin can be installed in the first retaining frame 12, which is beneficial to improve the protection of the square shaft pin. At the same time, by processing the matching portion 121, the width of the matching portion 121 along the axial direction of the main gear 11 is reduced, so that the side wall of the square shaft pin close to the second retaining frame 13 can reduce the distance from the end face of the matching portion 121 close to the second retaining frame 13, that is, the square shaft pin can adjust its position relative to the second retaining frame 13, which is beneficial to improve the applicability of the square shaft pin to different types of differentials 1.

[0065] In summary, in one embodiment, Figure 3As shown, the installation groove 122 is a rectangular groove, and the square shaft pin is a square groove. The two installation grooves 122 (i.e., rectangular grooves) penetrate the fitting portion 121 along the axial direction of the main gear 11, which can adjust the position of the square shaft pin relative to the second cage 13 and improve applicability. At the same time, the two installation grooves 122 do not penetrate the fitting portion 121 along the radial direction of the main gear 11, that is, along the radial direction of the main gear 11, the movement of the square shaft pin along the radial direction of the main gear 11 can be restricted, reducing the wear between the square shaft pin and the limiting portion 111 sleeved on the outer wall of the fitting portion 121, which is beneficial to improving the service life of the differential 1.

[0066] In one embodiment, as Figure 4 shown, the installation groove 122 is a rectangular groove, and the shaft pin 18 is a square shaft pin. The two installation grooves 122 (i.e., rectangular grooves) penetrate the fitting portion 121 both along the axial and radial directions of the main gear 11. That is, along the axial and radial directions of the main gear 11, the installation groove 122 is convenient for processing, reducing production costs and difficulties. At the same time, along the axial direction of the main gear 11, the square shaft pin can be directly placed in the installation groove 122, making the assembly process more convenient.

[0067] In a possible implementation manner, as Figure 5 shown, along the radial direction of the main gear 11, the installation groove 122 is a circular groove, and the cross-section of the shaft pin 18 perpendicular to its own axial direction is circular. At least one installation groove 122 penetrates the fitting portion 121 along the radial direction of the main gear 11. That is, the shaft pin 18 is a circular shaft pin.

[0068] Therefore, the circular shaft pin is easier to process and form in actual production. Selecting the circular shaft pin is beneficial to cost savings. At least one installation groove 122 penetrates the fitting portion 121 along the radial direction of the main gear 11, that is, the circular shaft pin can be assembled along the radial direction of the main gear, ensuring the feasibility of using the circular shaft pin for the first cage 12.

[0069] In the above embodiment, as Figure 5 shown, the fitting portion 121 is provided with two installation grooves 122, and the installation grooves 122 are located on the opposite sides of the fitting portion 121 along the radial direction of the main gear 11. That is, both ends of the circular shaft pin along the axis can be installed in the two installation grooves 122, and the inner wall of the circular groove can be in circumferential contact with the circular shaft pin to restrict the circumferential movement of the circular shaft pin, further improving the reliability of installing the circular shaft pin on the first cage 12. At the same time, the circular shaft pin is located on the central axis of the first cage 12, which is beneficial to improving the stability of the transmission torque.

[0070] In a possible implementation manner, the connection line of the two installation grooves 122 may not pass through the center of the circle, so that the shaft pin 18 can be eccentrically installed on the first cage 12 relative to the main gear 11, so as to be applicable to different structures of the differential 1.

[0071] In a possible implementation manner, as Figure 6And Figure 7 As shown in Figure 7 , the first cage 12 has a boss 123. The boss 123 is located on the outer wall of the mating portion 121 and is arranged along the circumferential direction of the mating portion 121. The main gear 11 has a first protrusion 112. The first protrusion 112 protrudes along the axial direction of the main gear 11 and is arranged along the axial direction of the limiting portion 111. Along the circumferential direction of the main gear 11, the boss 123 can abut against the first protrusion 112.

[0072] Therefore, the outer circumferential wall of the boss 123 can abut against the side wall of the first protrusion 112 along the circumferential direction of the main gear 11 and be welded together, so as to limit the circumferential movement of the first cage 12 along the main gear 11, improve the reliability of the first cage 12 acting on the differential 1. At the same time, the boss 123 can play a role in precise positioning during the assembly process of the main gear 11 and the first cage 12, thereby making the assembly process simpler and meeting the actual production requirements.

[0073] In a possible implementation manner, as shown in Figure 6 And Figure 7 As shown in Figure 7 , the main gear 11 further has a second protrusion 113. The second protrusion 113 protrudes along the radial direction of the main gear 11 and is arranged along the circumferential direction of the limiting portion 111. Along the axial direction of the main gear 11, the boss 123 can abut against the second protrusion 113.

[0074] Therefore, the end face of the boss 123 close to the second cage 13 can abut against the end face of the second protrusion 113 and be welded together, so as to limit the movement of the first cage 12 along the axial direction of the main gear 11 close to the second cage 13, that is, to limit the axial movement of the first cage 12 along the main gear 11, and improve the reliability of the first cage 12 acting on the differential 1.

[0075] In summary, by setting the first protrusion 112 and the second protrusion 113 to abut against the boss 123 respectively, the axial and circumferential movements of the first cage 12 along the main gear 11 can be limited, and the reliability of the connection between the first cage 12 and the main gear 11 can be further improved.

[0076] In the above embodiments, the boss 123, the first protrusion 112 and the second protrusion 113 can all be provided. Among them, as shown in Figure 6 As shown in Figure 6 , in the above Figure 4 embodiment, the mating portion 121 is additionally provided with a boss 123, and the main gear 11 is additionally provided with a first protrusion 112 and a second protrusion 113; as shown in Figure 7 As shown in Figure 7 , in the above Figure 5 embodiment, the mating portion 121 is additionally provided with a boss 123, and the main gear 11 is additionally provided with a first protrusion 112 and a second protrusion 113.

[0077] As shown in Figure 8 And Figure 9As shown, the differential 1 further includes side gears 14, planet gears 15 and gaskets 16. The first cage 12 and the second cage 13 enclose an installation cavity, and the side gears 14, planet gears 15 and gaskets 16 are installed in the installation cavity.

[0078] Specifically, the differential 1 includes two planet gears 15 that are radially opposite to each other along the main gear 11 and two side gears 14 that are axially opposite to each other along the main gear 11. As Figure 10 and Figure 11 shown, the planet gears 15 are sleeved on both ends of the axle pin 18 along the radial direction of the main gear 11. As Figure 12 and Figure 13 shown, the side gears 14 are located on both sides of the axle pin 18 along the axial direction of the main gear 11, that is, one side gear 14 is located inside the first cage 12, and one side gear 14 is located inside the second cage 13. The planet gears 15 can mesh with each side gear 14. The planet gears 15 can rotate on their own axes, that is, the planet gears 15 can rotate around the axle pin 18. At the same time, the planet gears 15 can revolve, that is, the planet gears 15 can rotate around the axis of the side gears 14. When the differential 1 works, during the meshing process of the planet gears 15 and the side gears 14, the planet gears 15 rotate on their own axes on the basis of revolving, so that different rotational speeds are obtained on both sides along the radial direction of the main gear 11.

[0079] Among them, the differential 1 further includes a first gasket and a second gasket. The first gasket is used to sleeve the side of the planet gear 15 close to the mating part 121, so that the planet gear 15 does not directly contact the mating part 121 during rotation. The second gasket is used to sleeve the side of the side gear 14 close to the cage, so that the side gear 14 does not directly contact the inside of the cage during rotation, thereby reducing the risk of cage wear and being beneficial to improving the service life of the differential 1.

[0080] In a possible implementation manner, the first gasket and the second gasket may be arc-shaped structures. Along the radial direction of the cage, the inner contours of the first cage 12 and the second cage 13 that abut against the gasket 16 are arc-shaped, and the outer contours of the planet gears 15 and the side gears 14 that abut against the gasket 16 are arc-shaped, that is, the outer contour of the gasket 16 is roughly similar to the inner contour of the cage, and the outer contour of the gasket 16 is similar to the outer contours of the planet gears 15 and the side gears 14, so that the gasket 16 has a good degree of fit with the cage and is also beneficial to reducing the occupation of space in the installation cavity.

[0081] In another possible implementation manner, the cross-sectional shapes of the first gasket and the second gasket may be planar. Along the radial direction of the cage, the end faces of the first cage 12 and the second cage 13 that abut against the gasket 16 are planar, and the end faces of the planet gears 15 and the side gears 14 that abut against the gasket 16 are planar.

[0082] Among them, the gasket 16 is selected from silicone, rubber, etc. The present application does not limit the material selected for the gasket 16, as long as a material with a lower hardness and wear resistance is selected.

[0083] The above is only the specific implementation manner of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. A differential, characterized in that, The differential (1) includes: A shaft pin (18); A main gear (11), the main gear (11) including a limiting portion (111) penetrating axially along the main gear (11); A cage, the cage including a first cage (12) formed by forging and a second cage (13) formed by stamping. The first cage (12) and the second cage (13) are respectively located on both axial sides of the main gear (11) and are both welded to the main gear (11); Wherein, the first cage (12) has a mating portion (121) extending in the axial direction of the main gear (11). The mating portion (121) is provided with a mounting groove (122). The mounting groove (122) extends radially along the main gear (11). The shaft pin (18) is installed in the mounting groove (122). The limiting portion (111) is sleeved with the mating portion (121), and the mating portion (121) is welded to the inner wall of the limiting portion (111).

2. The differential according to claim 1, wherein, Along the radial direction of the main gear (11), the mounting groove (122) is a rectangular groove, and the shaft pin (18) has a rectangular cross-section perpendicular to its own axial direction.

3. The differential according to claim 2, characterized in that, The mating portion (121) is provided with two of the mounting grooves (122), and the mounting grooves (122) are located on opposite sides of the mating portion (121) along the radial direction of the main gear (11).

4. The differential according to claim 3, characterized in that, At least one of the mounting grooves (122) penetrates the mating portion (121) along the radial direction of the main gear (11).

5. The differential according to claim 3, characterized in that, At least one of the mounting grooves (122) penetrates the mating portion (121) along the axial direction of the main gear (11).

6. The differential according to claim 1, wherein, Along the radial direction of the main gear (11), the mounting groove (122) is a circular groove, and the shaft pin (18) has a circular cross-section perpendicular to its own axial direction. At least one of the mounting grooves (122) penetrates the mating portion (121) along the radial direction of the main gear (11).

7. The differential according to claim 6, characterized in that, The mating portion (121) is provided with two of the mounting grooves (122), and the mounting grooves (122) are located on opposite sides of the mating portion (121) along the radial direction of the main gear (11).

8. The differential according to claim 1, characterized in that, The first cage (12) has a boss (123). The boss (123) is located on the outer wall of the mating portion (121) and is arranged circumferentially along the mating portion (121). The main gear (11) has a first protruding portion (112). The first protruding portion (112) protrudes axially along the main gear (11) and is arranged axially along the limiting portion (111). Along the circumferential direction of the main gear (11), the boss (123) can abut against the first protruding portion (112).

9. The differential according to claim 8, wherein, The main gear (11) further has a second protruding portion (113). The second protruding portion (113) protrudes radially along the main gear (11) and is arranged circumferentially along the limiting portion (111). Along the axial direction of the main gear (11), the boss (123) can abut against the second protruding portion (113).

10. The differential according to claim 9, characterized in that, The differential (1) further includes side gears (14), planetary gears (15), and shims (16). The first cage (12) and the second cage (13) enclose an installation cavity, and the side gears (14), the planetary gears (15), and the shims (16) are installed in the installation cavity.

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