Planetary gear gasket anti-rotation structure and differential assembly

Abstract

The present application relates to the technical field of automobile axle, and discloses a planetary gear gasket anti-rotation structure and a differential assembly, which comprises a differential left shell, a differential right shell, a cross shaft, planetary gears and planetary gear gaskets. The differential left shell and the differential right shell are butted and fixed by bolts to form a differential shell. The cross shaft is contained in the differential shell, and four shaft diameters of the cross shaft are limited and sleeved at the circumferential joints of the differential left shell and the differential right shell. Each planetary gear is rotatably sleeved on each shaft diameter of the cross shaft, and a planetary gear gasket is arranged between each planetary gear and the inner wall of the differential shell which is adjacent to the planetary gear. The planetary gear gasket is horizontally limited and sleeved on each shaft diameter of the cross shaft, and the planetary gear can rotate relative to the contacted planetary gear gasket. The present application can effectively prevent the rotation of the planetary gear gasket, avoid the scratch of the planetary gear gasket by the sharp corner of the joint of the differential left and right shells, and improve the reliability of the anti-rotation structure.

Description

Technical Field

[0001] This invention relates to the field of automotive axle technology, and in particular to a planetary gear shim anti-rotation structure and a differential assembly. Background Technology

[0002] The existing drive axle differentials have the following problems: 1. For planetary gear washers without anti-rotation structures, since the left and right differential housings are engaged with the planetary gear washers, when the planetary gear washers rotate, the sharp corners at the joint of the left and right differential housings scratch and wear the rotating planetary gear washers, leading to the failure of the differential assembly; 2. For planetary gear washers with anti-rotation structures, defects in the anti-rotation structure lead to fatigue wear of the anti-rotation structure, which in turn leads to the failure of the anti-rotation structure. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a planetary gear shim anti-rotation structure and a differential assembly. While effectively preventing the planetary gear shims from rotating, it also avoids the planetary gear shims being scratched by the sharp corners at the junction of the left and right halves of the differential. The anti-rotation structure is fatigue-resistant and wear-resistant, thus improving reliability.

[0004] This invention proposes a planetary gear shim anti-rotation structure, including a left differential housing, a right differential housing, a cross shaft, planetary gears, and planetary gear shims; The left and right differential housings are joined together and fixed with bolts to form the differential housing. The cross shaft is housed within the differential housing, and the four shaft diameters of the cross shaft are fitted into the circumferential joints of the left and right differential housings. The planetary gears are respectively rotatably fitted onto the four diameters of the cross shaft. A planetary gear washer is provided between each planetary gear and the inner wall of the adjacent differential housing. The planetary gear washer is horizontally anti-rotation limited and fitted onto each diameter of the cross shaft. The planetary gear can rotate relative to the contacting planetary gear washer. The planetary gear washer is relatively stationary on each diameter of the cross shaft through the anti-rotation structure. Since the planetary gear washer cannot rotate around the diameter of the cross shaft, it ensures that the joint between the left and right differential housings will not scratch the relatively static surface of the planetary gear washer. The anti-rotation structure is fatigue-resistant and wear-resistant, improving reliability.

[0005] The cross shaft includes four circumferentially evenly arranged cylindrical shaft diameters, each with symmetrical planar grooves on its upper and lower sidewalls. The planetary gear shim is a disc-shaped arc-shaped spherical shell with a central hole. Planar bosses are located on both sides of the hole, aligning and engaging with the cylindrical shaft diameters of the cross shaft. The planar bosses are aligned and fitted with the planar grooves of the cross shaft to prevent the planetary gear shim from rotating relative to the cylindrical shaft diameters. The convex surface of the disc-shaped arc-shaped spherical shell engages with the inner walls of the corresponding left and right differential housings. The concave surface of the disc-shaped arc-shaped spherical shell rotatably engages with the corresponding surfaces of the planetary gears. Several oil reservoirs are evenly distributed circumferentially on the concave surface of the disc-shaped arc-shaped spherical shell, allowing lubricating oil to accumulate in droplets and films at all reservoir locations, reducing friction between the planetary gears and the planetary gear shim. The left differential housing opening has a circumferentially inwardly spaced... The left housing is chamfered to remove sharp corners and burrs, preventing sharp corners from scratching the planetary gear washers at the joint of the left and right differential housings. A concave spherical surface is provided on the left differential housing corresponding to the convex surface of the disc-shaped arc-shaped spherical shell plate. This concave spherical surface matches and engages with the convex surface of the disc-shaped arc-shaped spherical shell plate. Four semi-circular holes are circumferentially arranged at the open end of the left differential housing, and these semi-circular holes engage with the corresponding cylindrical shaft diameter limiting sleeve. The right differential housing... The right housing has a chamfer along the inner edge of the opening to remove sharp corners and burrs, preventing sharp corners from scratching the planetary gear gasket at the joint of the left and right half housings of the differential; the right housing of the differential has a concave spherical surface corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell plate; the right housing of the differential has four semi-circular holes circumferentially arranged at the opening end of the right housing, which are fitted with the corresponding cylindrical shaft diameter limiting sleeve.

[0006] The cross shaft comprises four circumferentially evenly arranged cylindrical shaft diameters, each with symmetrically arranged concave arc grooves on its upper and lower sidewalls. The planetary gear washer is a disc-shaped arc-shaped spherical shell with a central hole. Two protruding arc bosses are located on either side of this hole. The hole aligns with the cylindrical shaft diameters of the cross shaft for a fitted fit, while the protruding arc bosses align with the concave arc grooves of the cross shaft for a limiting fit. This prevents the planetary gear washer from rotating relative to the cylindrical shaft diameters and addresses the stress concentration problem during fitting (the sharp corners of the cross shaft impacting the washer's cross-section). The convex surface of the disc-shaped arc-shaped spherical shell plate contacts and engages with the inner walls of the corresponding left and right differential housings. The concave surface of the disc-shaped arc-shaped spherical shell plate rotatably contacts the corresponding surfaces of the planetary gears. Several oil reservoirs are evenly distributed circumferentially on the concave surface of the disc-shaped arc-shaped spherical shell plate to allow lubricating oil to accumulate in all reservoir locations, reducing friction between the planetary gears and their gaskets. The left differential housing opening has rounded corners along its inner circumferential edge to remove sharp burrs and prevent burrs from forming at the joint between the left and right differential housings. The planetary gear shims are scratched by sharp corners; the left differential housing has a concave spherical surface corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell. The left differential housing has four semi-circular holes circumferentially arranged at its opening end, which engage with the corresponding cylindrical shaft diameter limiting sleeve; the right differential housing has rounded corners along its inner circumferential edge to remove sharp corner burrs and prevent sharp corners from scratching the planetary gear shims at the junction of the left and right differential housings; the right differential housing corresponds to the disc-shaped arc-shaped... The convex spherical surface of the spherical shell plate is provided with a concave spherical surface of the right shell, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell plate. The right shell opening end of the differential is provided with four right shell semi-circular holes in the circumference, and the right shell semi-circular holes are matched with the corresponding cylindrical shaft diameter limiting sleeve. Anti-rotation principle: the radius of the arc of the outer protruding arc boss of the planetary gear shim is smaller than the radius of the arc of the inner concave arc groove of the cross shaft. When the planetary gear shim has a tendency to rotate, the arc surface of the planetary gear shim matches the arc surface of the cross shaft, avoiding stress concentration caused by the two being in sharp corner contact.

[0007] The cross shaft comprises four circumferentially evenly arranged cylindrical shaft diameters, each with symmetrical planar grooves on its upper and lower sidewalls. The planetary gear shim is a disc-shaped arc-shaped spherical shell with a central hole. Two protruding arc-shaped bosses are located on either side of the hole. The hole aligns with the cylindrical shaft diameters of the cross shaft, and the protruding arc-shaped bosses align with the planar grooves of the cross shaft for a limiting fit. When the planetary gear shim tends to rotate, the arc surface of the arc-shaped bosses contacts the planar limiting surface of the cross shaft, resolving the stress concentration problem during engagement (the sharp corner of the planar groove of the cross shaft impacts the cross shaft's cross section). The convex surface of the disc-shaped arc-shaped spherical shell contacts the inner walls of the corresponding left and right differential housings. The concave surface of the disc-shaped arc-shaped spherical shell rotatably contacts the corresponding surfaces of the planetary gears. The concave spherical surface of the disc-shaped arc-shaped spherical shell plate has several oil reservoirs evenly distributed around its circumference, so that lubricating oil can be retained in all oil reservoir positions to form oil droplets and oil films, reducing friction between the planetary gears and planetary gear washers. The left differential housing has a left concave spherical surface corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell plate. The left differential housing has four semi-circular holes around its open end, which fit with the corresponding cylindrical shaft diameter limiting sleeve. The right differential housing has a right concave spherical surface corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell plate. The right differential housing has four semi-circular holes around its open end, which fit with the corresponding cylindrical shaft diameter limiting sleeve.

[0008] The cross shaft comprises four circumferentially evenly arranged cylindrical shaft diameters, each with symmetrical planar grooves on its upper and lower sidewalls. The planetary gear shim is a disc-shaped arc-shaped spherical shell with a central hole. Anti-rotation limiting bends are located on either side of the hole, pointing upwards or downwards. The hole aligns with the cylindrical shaft diameters of the cross shaft, and the anti-rotation limiting bends align with the planar grooves of the cross shaft. When the planetary gear shim tends to rotate, the anti-rotation limiting bends of the planetary gear shim contact the planar limiting of the cross shaft. Due to the large contact area between the bend and the planar groove of the cross shaft, the contact stress between them is reduced. The convex surface of the disc-shaped arc-shaped spherical shell contacts the inner walls of the corresponding left and right differential housings. The concave surface of the disc-shaped arc-shaped spherical shell matches the corresponding surface of the planetary gear, allowing for rotatable contact. Next, the concave spherical surface of the disc-shaped arc-shaped spherical shell has several oil reservoirs evenly distributed around its circumference, so that lubricating oil can be retained in all oil reservoirs as oil droplets and oil films, reducing friction between the planetary gears and planetary gear washers. The left differential housing has a left concave spherical surface corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell. The left differential housing has four semi-circular holes around its open end, which fit with the corresponding cylindrical shaft diameter limiter. The right differential housing has a right concave spherical surface corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell. The right differential housing has four semi-circular holes around its open end, which fit with the corresponding cylindrical shaft diameter limiter.

[0009] The cross shaft includes four circumferentially evenly arranged cylindrical shaft diameters, each with symmetrical planar grooves on its upper and lower sidewalls. The planetary gear shim is a disc-shaped arc-shaped spherical shell with a central hole. Planar bosses are located on both sides of the corresponding hole. The hole aligns with the cylindrical shaft diameters of the cross shaft, and the planar bosses align with the planar grooves of the cross shaft to prevent the planetary gear shim from rotating relative to the cylindrical shaft diameters. The convex spherical surface of the disc-shaped arc-shaped spherical shell and the aligned... The inner walls of the left and right differential housings are in contact with each other; the concave spherical surface of the disc-shaped arc-shaped spherical shell plate matches the corresponding surface of the planetary gear and can rotate in contact. Several oil reservoirs are evenly distributed circumferentially on the concave spherical surface of the disc-shaped arc-shaped spherical shell plate, allowing lubricating oil to accumulate in all reservoir positions, reducing friction between the planetary gears and the planetary gear washers; the upper part of the inner edge of the opening of the left differential housing has a chamfer, and the lower part of the inner edge of the opening of the left differential housing has... The differential features a rounded corner, with a large-angle chamfer and rounded corner at the junction of the left and right differential housings. This prevents sharp corners from forming on the differential housing and scratching the planetary gear washers during rotation. The left differential housing has a concave spherical surface corresponding to the convex surface of the disc-shaped arc-shaped spherical shell plate. This concave spherical surface matches and engages with the convex surface of the disc-shaped arc-shaped spherical shell plate. The left differential housing has four semi-circular holes circumferentially arranged at its open end, which engage with corresponding cylindrical shaft diameter limiting sleeves. The right housing of the differential has a chamfer along the inner edge of the opening circumferentially, and a rounded corner at the lower part of the inner edge of the opening circumferentially, to remove sharp corner burrs and avoid scratching the planetary gear shims; the right housing of the differential has a concave spherical surface corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell plate; the right housing of the differential has four semi-circular holes circumferentially arranged at the opening end of the right housing, which are fitted with the corresponding cylindrical shaft diameter limiting sleeve.

[0010] The cross shaft includes four circumferentially evenly arranged cylindrical shaft diameters; the planetary gear shim is a rectangular block with a central hole that aligns with the cylindrical shaft diameters of the cross shaft. The lower end face of the rectangular block is flat, and the upper end face is a convex arc surface that is thinner at both ends and thicker in the middle from left to right. The front and rear end faces of the rectangular block are vertical planes; the inner circumferential sidewall of the left differential housing opening has a concave arc surface corresponding to each convex arc surface position; the inner wall of the left differential housing has a left housing limiting plane corresponding to a vertical plane position of the rectangular block; the inner circumferential sidewall of the right differential housing opening has a concave arc surface corresponding to each convex arc surface position. The right housing has a concave arc surface at the arc position. The inner wall of the right housing of the differential has a right housing limiting plane at another vertical plane position corresponding to the same rectangular block. The left housing concave arc surface, the left housing limiting plane, the right housing concave arc surface, and the right housing limiting plane of the differential left housing and differential right housing match and limit the upper end face of the rectangular block within it. The concave arc surface of the differential housing and the limiting planes on both sides restrict the planetary gear shims from rotating along the cross shaft axis, thereby realizing the anti-rotation function. The planetary gear is rotated and sleeved on the cylindrical shaft diameter, and the plane contact surface between the planetary gear and the rectangular block is a horizontal plane.

[0011] The cross shaft includes four circumferentially evenly arranged cylindrical shaft diameters, on which the planetary gears are rotatably fitted. The planetary gear shims are integrally disc-shaped arc-shaped spherical shells with a central hole that fits onto the cylindrical shaft diameters. A rectangular anti-rotation limiting edge extends from one side of the disc-shaped arc-shaped spherical shell. The rectangular anti-rotation limiting edges of the planetary gear shims fitted onto two cylindrical shaft diameters are adjacent and in contact, restricting the relative rotation of these two planetary gear shims. The planetary gear shims fitted onto the other two cylindrical shaft diameters... The rectangular anti-rotation limiting edges are also adjacent and limit contact, forming two sets of planetary gear shim anti-rotation structures. The upper end faces of the two sets of planetary gear shim anti-rotation structures match and contact the inner walls of the corresponding left and right differential housings. The concave spherical surfaces on the outer side of the circular holes of the two sets of planetary gear shim anti-rotation structures rotate and engage with the convex spherical surfaces of the corresponding planetary gears. The rectangular anti-rotation limiting edges of the two planetary gear shims are opposite to each other and contact and lock each other, restricting their mutual rotation. There are two pairs of such structures, which realize the anti-rotation function of the planetary gear shims.

[0012] A planetary gear anti-rotation structure further includes half-shaft gears and half-shaft gear shims. The half-shaft gears are respectively disposed on both sides of the four planetary gears. The bevel teeth of each half-shaft gear mesh with the bevel teeth on one side of the four planetary gears. The half-shaft gear shims are sleeved on the outer end of the half-shaft gears, and the two half-shaft gear shims make limited contact with the inner wall of the left differential housing and the inner wall of the right differential housing.

[0013] The differential assembly includes the aforementioned planetary gear shim anti-rotation structure.

[0014] Beneficial effects This invention effectively prevents the planetary gear shims from rotating, thus avoiding scratches from the sharp corners at the junction of the left and right halves of the differential. The anti-rotation structure is fatigue-resistant and wear-resistant, improving reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall cross-sectional structure of Embodiment 1 of the present invention.

[0016] Figure 2 This is a schematic diagram of the cross shaft structure in Embodiment 1 of the present invention.

[0017] Figure 3 This is a schematic diagram of the front and back structure of the planetary gear washer in Embodiment 1 of the present invention.

[0018] Figure 4 This is a schematic diagram of the disassembled structure of the left and right halves of the differential in Embodiment 1 of the present invention.

[0019] Figure 5 This is a schematic diagram of the overall cross-sectional structure of Embodiment 2 of the present invention.

[0020] Figure 6 This is a schematic diagram of the front and back structure of the planetary gear washer in Embodiment 2 of the present invention.

[0021] Figure 7 This is a schematic diagram of the cross shaft structure in Embodiment 2 of the present invention.

[0022] Figure 8 This is a schematic diagram of the overall cross-sectional structure of Embodiment 3 of the present invention.

[0023] Figure 9 This is a schematic diagram of the front and back structure of the planetary gear washer in Embodiment 3 of the present invention.

[0024] Figure 10 This is a schematic diagram of the cross shaft structure in Embodiment 3 of the present invention.

[0025] Figure 11 This is a schematic diagram of the overall cross-sectional structure of Embodiment 4 of the present invention.

[0026] Figure 12 This is a schematic diagram of the front and back structure of the planetary gear washer in Embodiment 4 of the present invention.

[0027] Figure 13 This is a schematic diagram of the cross shaft structure in Embodiment 4 of the present invention.

[0028] Figure 14 This is a schematic diagram of the overall cross-sectional structure of Embodiment 5 of the present invention.

[0029] Figure 15 This is a schematic diagram of the disassembled structure of the left and right halves of the differential in Embodiment 5 of the present invention.

[0030] Figure 16This is a schematic diagram of the overall cross-sectional structure of Embodiment 6 of the present invention.

[0031] Figure 17 This is a schematic diagram of the front and back structure of the planetary gear washer in Embodiment 6 of the present invention.

[0032] Figure 18 This is a schematic diagram of the cross shaft structure in Embodiment 6 of the present invention.

[0033] Figure 19 This is a schematic diagram of the disassembled structure of the left and right halves of the differential in Embodiment 6 of the present invention.

[0034] Figure 20 This is a schematic diagram of the front and back structure of the planetary gear in Embodiment 6 of the present invention.

[0035] Figure 21 This is a schematic diagram of the overall cross-sectional structure of Embodiment 7 of the present invention.

[0036] Figure 22 This is an exploded structural diagram of Embodiment 7 of the present invention.

[0037] Figure 23 This is a schematic diagram of the front and back structure of the planetary gear washer in Embodiment 7 of the present invention.

[0038] In the picture: 1. Left differential housing; 1.1. Chamfer on the left housing; 1.2. Concave spherical surface on the left housing; 1.3. Semicircular hole on the left housing; 1.4. Concave arc surface on the left housing; 1.5. Limiting plane on the left housing; 2. Right differential housing; 2.1. Right housing chamfer; 2.2. Right housing concave spherical surface; 2.3. Right housing semi-circular hole; 2.4. Right housing concave arc surface; 2.5. Right housing limiting plane; 3. Cross shaft; 3.1. Cylindrical shaft diameter; 3.2. Flat groove; 3.3. Concave circular arc groove; 4. Planetary gears; 4.1. Horizontal plane; 5. Planetary gear shims; 5.1. Disc-shaped arc-shaped spherical shell; 5.2. Circular hole; 5.3. Flat boss; 5.4. Oil reservoir; 5.5. Outwardly protruding arc-shaped boss; 5.6. Anti-rotation limiting bend; 5.7. Rectangular block; 5.8. Plane; 5.9. Convex arc surface; 5.10. Vertical plane; 5.11. Rectangular anti-rotation limiting edge; 6. Half-shaft gear; 7. Half-shaft gear shims. Detailed Implementation

[0039] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0042] Example 1 See Figures 1-4 As shown, a planetary gear shim anti-rotation structure includes a left differential housing 1, a right differential housing 2, a cross shaft 3, planetary gears 4, and planetary gear shims 5. The left differential housing 1 and the right differential housing 2 are connected and fixed with bolts to form a differential housing. The cross shaft 3 is housed inside the differential housing, and the four shaft diameters of the cross shaft 3 are limited and fitted at the circumferential joint between the left differential housing 1 and the right differential housing 2. The planetary gears 4 are respectively rotatably sleeved on the four shaft diameters of the cross shaft 3. Each planetary gear 4 is provided with a planetary gear shim 5 between itself and the inner wall of the differential housing that is adjacent to it. The planetary gear shim 5 is horizontally anti-rotation limited sleeved on each shaft diameter of the cross shaft 3. The planetary gear 4 can rotate relative to the contacting planetary gear shim 5.

[0043] The cross shaft 3 includes four circumferentially evenly arranged cylindrical shaft diameters 3.1, each cylindrical shaft diameter 3.1 having symmetrically arranged planar grooves 3.2 on its upper and lower sidewalls; the planetary gear shim 5 is a disc-shaped arc-shaped spherical shell 5.1, with a circular hole 5.2 at its center, and planar bosses 5.3 on both sides corresponding to the circular hole 5.2. The circular hole 5.2 is aligned and fitted with the cylindrical shaft diameters 3.1 of the cross shaft 3, and the planar bosses 5.3 are aligned and limited by the planar grooves 3.2 of the cross shaft 3; the convex surface of the disc-shaped arc-shaped spherical shell 5.1 contacts and fits with the inner walls of the corresponding left differential housing 1 and right differential housing 2; the concave surface of the disc-shaped arc-shaped spherical shell 5.1 matches and can rotatably contact the corresponding surface of the planetary gear 4, and 294 oil reservoirs 5.4 are evenly distributed circumferentially on the concave surface of the disc-shaped arc-shaped spherical shell 5.1; the opening of the left differential housing 1 is circumferentially... The inner edge is provided with a left housing chamfer 1.1; the left housing 1 of the differential has a left housing concave spherical surface 1.2 corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate 5.1, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell plate 5.1; the left housing 1 of the differential has four left housing semi-circular holes 1.3 circumferentially provided at the open end, and the left housing semi-circular holes 1.3 are fitted with the corresponding cylindrical shaft diameter 3.1 for limiting engagement; the right differential... The inner edge of the opening of the housing 2 is provided with a right housing chamfer 2.1; the right housing 2 of the differential is provided with a right housing concave spherical surface 2.2 corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate 5.1. The right housing concave spherical surface 2.2 is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell plate 5.1. The opening end of the right housing 2 of the differential is provided with four right housing semi-circular holes 2.3, which are fitted with the corresponding cylindrical shaft diameter 3.1 for limiting engagement.

[0044] A planetary gear anti-rotation structure further includes a half-shaft gear 6 and a half-shaft gear shim 7. The half-shaft gear 6 is respectively disposed on both sides of the four planetary gears 4. The bevel teeth of each half-shaft gear 6 mesh with the bevel teeth on one side of the four planetary gears 4. The half-shaft gear shim 7 is sleeved on the outer end of the half-shaft gear 6, and the two half-shaft gear shims 7 make limited contact with the inner wall of the corresponding differential left housing 1 and the inner wall of the differential right housing 2.

[0045] Example 2 See Figures 4-7As shown, a planetary gear shim anti-rotation structure differs from Embodiment 1 in that the cross shaft 3 includes four circumferentially evenly arranged cylindrical shaft diameters 3.1, and each cylindrical shaft diameter 3.1 has symmetrically provided concave arc grooves 3.3 on its upper and lower side walls; the planetary gear shim 5 is a disc-shaped arc-shaped spherical shell 5.1, with a circular hole 5.2 at its center, and protruding arc bosses 5.5 on both sides corresponding to the circular hole 5.2. 2. The cylindrical shaft diameter 3.1 of the cross shaft 3 is sleeved and fitted; the outwardly protruding arc boss 5.5 is fitted and limited by the inwardly concave arc groove 3.3 of the cross shaft 3; the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1 contacts and fits with the inner wall of the left differential shell 1 and the inner wall of the right differential shell 2; the concave spherical surface of the disc-shaped arc-shaped spherical shell 5.1 matches and rotatably contacts the corresponding surface of the planetary gear 4; the concave spherical surface of the disc-shaped arc-shaped spherical shell 5.1 has 2 evenly distributed circumferential features. 94 oil reservoirs 5.4; the left differential housing 1 has rounded corners along the inner edge of its opening; the left differential housing 1 has a concave spherical surface 1.2 corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1; the left differential housing 1 has four semi-circular holes 1.3 circumferentially arranged at the opening end of the left differential housing 1, and the semi-circular holes 1.3 are limited to the diameter 3.1 of the aligned cylindrical shaft. The differential right housing 2 has a rounded corner along the inner edge of the opening; the differential right housing 2 has a right housing concave spherical surface 2.2 corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1; the differential right housing 2 has four right housing semi-circular holes 2.3 circumferentially arranged at the opening end of the differential right housing 2, which are fitted with the corresponding cylindrical shaft diameter 3.1 in a limiting sleeve fit.

[0046] Example 3 See Figure 4 , Figures 8-10As shown, a planetary gear shim anti-rotation structure differs from Embodiment 1 in that the cross shaft 3 includes four circumferentially evenly arranged cylindrical shaft diameters 3.1, each cylindrical shaft diameter 3.1 having symmetrically arranged planar grooves 3.2 on its upper and lower sidewalls; the planetary gear shim 5 is a disc-shaped arc-shaped spherical shell 5.1 with a central hole 5.2, and protruding arc-shaped bosses 5.5 on both sides of the hole 5.2. The hole 5.2 is aligned and fitted with the cylindrical shaft diameters 3.1 of the cross shaft 3, and the protruding arc-shaped bosses 5.5 are aligned and limited by the planar grooves 3.2 of the cross shaft 3; the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1 contacts the inner wall of the corresponding left differential housing 1 and the inner wall of the right differential housing 2; the concave spherical surface of the disc-shaped arc-shaped spherical shell 5.1 rotatably contacts the corresponding surface of the planetary gear 4. The concave spherical surface of the differential housing 5.1 is evenly distributed with 294 oil reservoirs 5.4. The left differential housing 1 has a concave spherical surface 1.2 corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical housing 5.1. This concave spherical surface 1.2 matches and engages with the convex spherical surface of the disc-shaped arc-shaped spherical housing 5.1. The open end of the left differential housing 1 has four semi-circular holes 1.3 circumferentially arranged. These semi-circular holes 1.3 are aligned with the... The cylindrical shaft diameter 3.1 is fitted with a limiting sleeve; the right housing 2 of the differential is provided with a right housing concave spherical surface 2.2 at the convex spherical surface position corresponding to the disc-shaped arc-shaped spherical shell plate 5.1. The right housing concave spherical surface 2.2 is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell plate 5.1. The right housing 2 of the differential has four right housing semi-circular holes 2.3 circumferentially arranged at the open end. The right housing semi-circular holes 2.3 are fitted with the corresponding cylindrical shaft diameter 3.1.

[0047] Example 4 See Figure 4 , Figures 11-13As shown, a planetary gear shim anti-rotation structure differs from Embodiment 1 in that the cross shaft 3 includes four circumferentially evenly arranged cylindrical shaft diameters 3.1, each cylindrical shaft diameter 3.1 having symmetrically arranged planar grooves 3.2 on its upper and lower sidewalls; the planetary gear shim 5 is a disc-shaped arc-shaped spherical shell 5.1 with a central hole 5.2, and anti-rotation limiting bending edges 5.6 on both sides corresponding to the hole 5.2. The hole 5.2 is aligned and fitted with the cylindrical shaft diameters 3.1 of the cross shaft 3, and the anti-rotation limiting bending edges 5.6 are aligned and limited by the planar grooves 3.2 of the cross shaft 3; the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1 contacts the inner wall of the corresponding left differential housing 1 and the inner wall of the right differential housing 2; the concave spherical surface of the disc-shaped arc-shaped spherical shell 5.1 rotatably contacts the corresponding surface of the planetary gear 4. The concave spherical surface of the arc-shaped spherical shell plate 5.1 is evenly distributed with 294 oil reservoirs 5.4. The left differential housing 1, corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate 5.1, has a left concave spherical surface 1.2, which matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell plate 5.1. The open end of the left differential housing 1 has four left semi-circular holes 1.3 circumferentially arranged, which connect with the corresponding... The cylindrical shaft diameter 3.1 of the differential is fitted with a limiting sleeve; the right housing 2 of the differential is provided with a right housing concave spherical surface 2.2 at the convex spherical surface position of the disc-shaped arc-shaped spherical shell plate 5.1. The right housing concave spherical surface 2.2 is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell plate 5.1. The right housing 2 of the differential is provided with four right housing semi-circular holes 2.3 circumferentially at the open end. The right housing semi-circular holes 2.3 are fitted with the corresponding cylindrical shaft diameter 3.1.

[0048] Example 5 See Figures 14-15As shown, a planetary gear shim anti-rotation structure differs from Embodiment 1 in that the cross shaft 3 includes four circumferentially evenly arranged cylindrical shaft diameters 3.1, each cylindrical shaft diameter 3.1 having symmetrically arranged planar grooves 3.2 on its upper and lower sidewalls; the planetary gear shim 5 is an overall disc-shaped arc-shaped spherical shell 5.1, with a circular hole 5.2 at its center, and planar bosses 5.3 on both sides corresponding to the circular hole 5.2, the circular hole 5.2 being aligned with the cylindrical shaft diameters 3.1 of the cross shaft 3. The differential features a socketed fit, with the planar boss 5.3 aligning with and limiting the planar groove 3.2 of the cross shaft 3; the convex surface of the disc-shaped arc-shaped spherical shell 5.1 contacts the inner wall of the corresponding left differential housing 1 and right differential housing 2; the concave surface of the disc-shaped arc-shaped spherical shell 5.1 rotatably contacts the corresponding surface of the planetary gear 4; the concave surface of the disc-shaped arc-shaped spherical shell 5.1 has 294 oil reservoirs 5.4 evenly distributed circumferentially; the left differential housing 1 has a left... The differential left housing 1 has a chamfered corner of 1.1, and the lower part of the inner edge of the opening of the differential left housing 1 is rounded. The differential left housing 1 has a concave spherical surface 1.2 corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1. This concave spherical surface 1.2 matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1. The differential left housing 1 has four semi-circular holes 1.3 circumferentially arranged at the opening end, which are fitted with the corresponding cylindrical shaft diameter 3.1. The differential right housing 2 has... The right housing 2 has a chamfer 2.1 along the inner edge of the opening, and a rounded corner at the lower part of the inner edge of the opening of the right housing 2 of the differential; the right housing 2 of the differential has a concave spherical surface 2.2 corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1, and the concave spherical surface 2.2 of the right housing matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell 5.1. The opening end of the right housing 2 of the differential has four right housing semi-circular holes 2.3, and the right housing semi-circular holes 2.3 are fitted with the corresponding cylindrical shaft diameter 3.1 for limiting engagement.

[0049] Example 6 See Figures 16-20As shown, a planetary gear shim anti-rotation structure differs from Embodiment 1 in that the cross shaft 3 includes four circumferentially evenly arranged cylindrical shaft diameters 3.1; the planetary gear shim 5 is a rectangular block 5.7 with a central hole 5.2, which aligns with and engages with the cylindrical shaft diameters 3.1 of the cross shaft 3; the lower end face of the rectangular block 5.7 is a plane 5.8, and the upper end face of the rectangular block 5.7 is a convex arc surface 5.9 from left to right, thinner at both ends and thicker in the middle; the front and rear end faces of the rectangular block 5.7 are vertical planes 5.10; the inner sidewall of the differential left housing 1 has a concave arc surface 1.4 corresponding to each convex arc surface 5.9, and the inner wall of the differential left housing 1 corresponds to the rectangular block 5.7... A left housing limiting plane 1.5 is provided at position 5.10 on a vertical plane. A right housing concave arc surface 2.4 is provided on the inner sidewall of the opening of the differential right housing 2 at position 5.9 corresponding to each convex arc surface 5.9. A right housing limiting plane 2.5 is provided on the inner wall of the differential right housing 2 at position 5.10 on another vertical plane of the same rectangular block 5.7. The left housing concave arc surface 1.4, left housing limiting plane 1.5, right housing concave arc surface 2.4 and right housing limiting plane 2.5 of the differential left housing 1 and differential right housing 2 match and limit the upper end face of a rectangular block 5.7 and fit it in. The planetary gear 4 is rotated and sleeved on the cylindrical shaft diameter 3.1, and the contact surface of the planetary gear 4 and the plane 5.8 of the rectangular block 5.7 is a horizontal plane 4.1.

[0050] Example 7 See Figures 21-23 As shown, a planetary gear shim anti-rotation structure differs from Embodiment 1 in that the cross shaft 3 includes four circumferentially evenly arranged cylindrical shaft diameters 3.1, and the planetary gear 4 is rotatably fitted onto the cylindrical shaft diameters 3.1; the planetary gear shim 5 is generally a disc-shaped arc-shaped spherical shell 5.1, with a circular hole 5.2 at its center, which fits onto the cylindrical shaft diameters 3.1; a rectangular anti-rotation limiting edge 5.11 extends from one side of the disc-shaped arc-shaped spherical shell 5.1, and the two cylindrical shaft diameters 3.1 are... The rectangular anti-rotation limiting edges 5.11 of the planetary gear washers 5 are adjacent and limit contact. The rectangular anti-rotation limiting edges 5.11 of the planetary gear washers 5 fitted on the other two cylindrical shaft diameters 3.1 are also adjacent and limit contact, forming two sets of planetary gear washer anti-rotation structures. The upper end faces of the two sets of planetary gear washer anti-rotation structures match and contact the inner walls of the corresponding differential left housing 1 and differential right housing 2. The concave spherical surfaces on the outer side of the circular holes 5.2 of the two sets of planetary gear washer anti-rotation structures rotate and engage with the convex spherical surfaces of the corresponding planetary gears 4.

[0051] Example 8 The differential assembly includes the aforementioned planetary gear shim anti-rotation structure.

[0052] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A planetary gear shim anti-rotation structure, characterized in that: Includes left differential housing (1), right differential housing (2), cross shaft (3), planetary gear (4), and planetary gear shims (5); The left differential housing (1) and the right differential housing (2) are joined together and fixed with bolts to form the differential housing; The cross shaft (3) is housed in the differential housing, and the four shaft diameters of the cross shaft (3) are fitted into the circumferential joint of the left differential housing (1) and the right differential housing (2). The planetary gears (4) are respectively rotatably sleeved on the four shaft diameters of the cross shaft (3). Each planetary gear (4) is provided with a planetary gear shim (5) between itself and the inner wall of the differential housing that is adjacent to it. The planetary gear shim (5) is horizontally anti-rotation limited sleeved on each shaft diameter of the cross shaft (3). The planetary gear (4) can rotate relative to the contacting planetary gear shim (5).

2. The planetary gear shim anti-rotation structure according to claim 1, characterized in that: The cross shaft (3) includes four circumferentially evenly arranged cylindrical shaft diameters (3.1), and each cylindrical shaft diameter (3.1) has symmetrically arranged planar grooves (3.2) on its upper and lower side walls; the planetary gear washer (5) is a disc-shaped arc-shaped spherical shell (5.1) with a circular hole (5.2) at its center. Planar bosses (5.3) are provided on both sides of the circular hole (5.2). The circular hole (5.2) is aligned and fitted with the cylindrical shaft diameters (3.1) of the cross shaft (3). The boss (5.3) is aligned with the plane groove (3.2) of the cross shaft (3) for limiting fit; the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is in contact with the inner wall of the corresponding differential left shell 1 and the inner wall of the differential right shell (2); the concave spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is matched with the corresponding surface of the planetary gear (4) for rotatable contact, and several oil storage pits (5.4) are evenly distributed circumferentially on the concave spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1); the opening of the differential left shell (1) is circumferentially... The inner edge is provided with a left housing chamfer (1.1); the left housing (1) of the differential is provided with a left housing concave spherical surface (1.2) corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1), and the left housing concave spherical surface (1.2) matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1). The left housing (1) of the differential is provided with four left housing semi-circular holes (1.3) circumferentially arranged at the open end, and the left housing semi-circular holes (1.3) are fitted with the corresponding cylindrical shaft diameter (3.1) for limiting; the right housing of the differential (2) A right shell chamfer (2.1) is provided along the inner edge of the opening circumference; the right shell of the differential (2) is provided with a right shell concave spherical surface (2.2) corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1). The right shell concave spherical surface (2.2) is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1). The opening end of the differential right shell (2) is provided with four right shell semicircular holes (2.3). The right shell semicircular holes (2.3) are matched and contacted with the corresponding cylindrical shaft diameter (3.1).

3. The planetary gear shim anti-rotation structure according to claim 1, characterized in that: The cross shaft (3) includes four circumferentially evenly arranged cylindrical shaft diameters (3.1), and each cylindrical shaft diameter (3.1) has symmetrically provided concave arc grooves (3.3) on its upper and lower side walls; the planetary gear washer (5) is a disc-shaped arc-shaped spherical shell (5.1) with a circular hole (5.2) in its center. The two sides of the circular hole (5.2) are respectively provided with protruding arc bosses (5.5). The circular hole (5.2) is aligned and fitted with the cylindrical shaft diameters (3.1) of the cross shaft (3). The outer protruding arc boss (5.5) is aligned and limited by the inner concave arc groove (3.3) of the cross shaft (3); the convex spherical surface of the disc-shaped arc spherical shell plate (5.1) is in contact with the inner wall of the corresponding left differential shell (1) and the inner wall of the right differential shell (2); the concave spherical surface of the disc-shaped arc spherical shell plate (5.1) is rotatably contacted with the corresponding surface of the planetary gear (4); the concave spherical surface of the disc-shaped arc spherical shell plate (5.1) has several oil storage pits (5.4) evenly distributed around its circumference; The left differential housing (1) has rounded corners along the inner edge of its opening; the left differential housing (1) has a concave spherical surface (1.2) corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1), which is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1); the left differential housing (1) has four semi-circular holes (1.3) circumferentially arranged at the opening end, which are fitted with the corresponding cylindrical shaft diameter (3.1); The differential right housing (2) has rounded corners along the inner edge of the opening circumferentially; the differential right housing (2) has a right housing concave spherical surface (2.2) at the position of the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1), and the right housing concave spherical surface (2.2) matches and contacts the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1). The differential right housing (2) has four right housing semi-circular holes (2.3) circumferentially arranged at the opening end, and the right housing semi-circular holes (2.3) are limited and sleeved with the corresponding cylindrical shaft diameter (3.1).

4. The planetary gear shim anti-rotation structure according to claim 1, characterized in that: The cross shaft (3) includes four circumferentially evenly arranged cylindrical shaft diameters (3.1), and each cylindrical shaft diameter (3.1) has symmetrically arranged planar grooves (3.2) on its upper and lower side walls; the planetary gear shim (5) is a disc-shaped arc-shaped spherical shell (5.1) with a circular hole (5.2) in its center. The two sides of the circular hole (5.2) are respectively provided with outwardly protruding arc-shaped bosses (5.5). The circular hole (5.2) is aligned with the cylinder of the cross shaft (3). The shaft diameter (3.1) is fitted with a sleeve, and the protruding arc boss (5.5) is aligned with the plane groove (3.2) of the cross shaft (3) for limiting fit; the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is in contact with the inner wall of the corresponding differential left shell (1) and differential right shell (2); the concave spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is matched with the corresponding surface of the planetary gear (4) for rotatable contact, and the circumferential direction of the concave spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is circumferentially oriented. A number of oil reservoirs (5.4) are evenly distributed; the left housing (1) of the differential is provided with a left housing concave spherical surface (1.2) corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1). The left housing concave spherical surface (1.2) is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1). The left housing (1) of the differential is provided with four left housing semi-circular holes (1.3) circumferentially arranged at the open end. The left housing semi-circular holes (1.3) are aligned with the cylindrical shaft diameter (3). 1) Limiting sleeve fit; the right housing (2) of the differential is provided with a right housing concave spherical surface (2.2) corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1). The right housing concave spherical surface (2.2) is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell (5.1). The right housing (2) of the differential is provided with four right housing semi-circular holes (2.3) circumferentially at the open end. The right housing semi-circular holes (2.3) are limited sleeve fit with the corresponding cylindrical shaft diameter (3.1).

5. The planetary gear shim anti-rotation structure according to claim 1, characterized in that: The cross shaft (3) includes four circumferentially evenly arranged cylindrical shaft diameters (3.1), and each cylindrical shaft diameter (3.1) has symmetrically arranged planar grooves (3.2) on its upper and lower side walls; the planetary gear washer (5) is a disc-shaped arc-shaped spherical shell (5.1) with a circular hole (5.2) in its center. The two ends corresponding to the circular hole (5.2) are respectively provided with anti-rotation limiting bending edges (5.6) facing upward or downward. The circular hole (5.2) is aligned with the cross shaft (3). 3) The cylindrical shaft diameter (3.1) is fitted with the anti-rotation limiting bending edge (5.6) and the planar groove (3.2) of the cross shaft (3) is fitted with the limiting edge; the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is in contact with the inner wall of the corresponding differential left shell (1) and differential right shell (2); the concave spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is matched with the corresponding surface of the planetary gear (4) and can be rotatably contacted. The spherical surface is evenly distributed with several oil reservoirs (5.4); the left differential housing (1) is provided with a left concave spherical surface (1.2) corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical housing plate (5.1). The left concave spherical surface (1.2) is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical housing plate (5.1). The left differential housing (1) is provided with four left semi-circular holes (1.3) circumferentially arranged at the open end. The left semi-circular holes (1.3) are aligned with the cylindrical shaft diameter (5.4). 3.1) Limiting sleeve fit; The right housing (2) of the differential is provided with a right housing concave spherical surface (2.2) at the convex spherical surface position corresponding to the disc-shaped arc-shaped spherical shell plate (5.1). The right housing concave spherical surface (2.2) is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1). The right housing (2) of the differential is provided with four right housing semi-circular holes (2.3) circumferentially at the open end. The right housing semi-circular holes (2.3) are limited sleeve fit with the corresponding cylindrical shaft diameter (3.1).

6. The planetary gear shim anti-rotation structure according to claim 1, characterized in that: The cross shaft (3) includes four circumferentially evenly arranged cylindrical shaft diameters (3.1), and each cylindrical shaft diameter (3.1) has symmetrically arranged planar grooves (3.2) on its upper and lower side walls; the planetary gear washer (5) is a disc-shaped arc-shaped spherical shell (5.1) with a circular hole (5.2) at its center. The two sides of the circular hole (5.2) are respectively provided with planar bosses (5.3). The circular hole (5.2) is aligned with the cylindrical shaft diameter (3.1) of the cross shaft (3), and the planar bosses (5.3) are aligned with the cross shaft. (3) The planar groove (3.2) is limited and fitted; the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is in contact with the inner wall of the corresponding differential left shell (1) and differential right shell (2); the concave spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) is matched with the corresponding surface of the planetary gear (4) and can be rotatably contacted; the concave spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1) has several oil storage pits (5.4) evenly distributed around its circumference; the left shell (1) of the differential has a chamfer (1.1) on the upper part of the inner edge of the opening of the differential left shell (1), and the left shell of the differential... (1) The lower part of the opening circumferentially inner edge is provided with a rounded corner; the left housing (1) of the differential is provided with a left housing concave spherical surface (1.2) corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1), and the left housing concave spherical surface (1.2) is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1). The left housing (1) of the differential is provided with four left housing semi-circular holes (1.3) circumferentially at the opening end, and the left housing semi-circular holes (1.3) are matched and fitted with the corresponding cylindrical shaft diameter (3.1) for limiting sleeve engagement; the right housing (2) of the differential is provided with a rounded corner at the lower part of the opening circumferentially inner edge. The right housing is chamfered (2.1), and the lower part of the inner edge of the opening of the right housing (2) of the differential is rounded; the right housing (2) of the differential is provided with a right housing concave spherical surface (2.2) corresponding to the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1). The right housing concave spherical surface (2.2) is matched and contacted with the convex spherical surface of the disc-shaped arc-shaped spherical shell plate (5.1). The opening end of the right housing (2) of the differential is provided with four right housing semi-circular holes (2.3) in the circumferential direction. The right housing semi-circular holes (2.3) are matched and connected with the corresponding cylindrical shaft diameter (3.1) in a limiting sleeve fit.

7. The planetary gear shim anti-rotation structure according to claim 1, characterized in that: The cross shaft (3) includes four circumferentially evenly arranged cylindrical shaft diameters (3.1); the planetary gear shim (5) is a rectangular block (5.7) with a central hole (5.2), which is aligned with the cylindrical shaft diameter (3.1) of the cross shaft (3). The lower end face of the rectangular block (5.7) is a plane (5.8), and the upper end face of the rectangular block (5.7) is a convex arc surface (5.9) that is thin at both ends and thick in the middle from left to right. The front and rear end faces of the rectangular block (5.7) are vertical planes (5.10); the inner sidewall of the differential left housing (1) is provided with a left housing concave arc surface (1.4) corresponding to each convex arc surface (5.9), and the inner wall of the differential left housing (1) is provided with a left housing limit corresponding to one vertical plane (5.10) of the rectangular block (5.7). The differential right housing (2) has a right housing concave arc surface (2.4) corresponding to each convex arc surface (5.9) on the inner side wall of the opening of the differential right housing (2). The differential right housing (2) has a right housing limiting plane (2.5) corresponding to another vertical plane (5.10) of the same rectangular block (5.7). The left housing concave arc surface (1.4), left housing limiting plane (1.5), right housing concave arc surface (2.4) and right housing limiting plane (2.5) of the differential left housing (1) and differential right housing (2) match and limit the upper end face of a rectangular block (5.7) and fit it in. The planetary gear (4) is rotated and sleeved on the cylindrical shaft diameter (3.1). The contact surface of the planetary gear (4) and the plane (5.8) of the rectangular block (5.7) is a horizontal plane (4.1).

8. The planetary gear shim anti-rotation structure according to claim 1, characterized in that: The cross shaft (3) includes four circumferentially evenly arranged cylindrical shaft diameters (3.1), and the planetary gear (4) is rotatably sleeved on the cylindrical shaft diameters (3.1); the planetary gear washer (5) is a disc-shaped arc-shaped spherical shell (5.1) with a circular hole (5.2) in its center, which is sleeved on the cylindrical shaft diameter (3.1). A rectangular anti-rotation limiting edge (5.11) extends from one side of the disc-shaped arc-shaped spherical shell (5.1), and the planetary gear washer (5) is sleeved on the two cylindrical shaft diameters (3.1). The rectangular anti-rotation limiting edge (5.11) of the planetary gear shims (5) fitted on the other two cylindrical shaft diameters (3.1) are adjacent to each other and the rectangular anti-rotation limiting edge (5.11) of the planetary gear shims (5) are also ...

9. A planetary gear shim anti-rotation structure according to any one of claims 1-8, characterized in that: It also includes half-shaft gears (6) and half-shaft gear washers (7). The half-shaft gears (6) are respectively set on both sides of the four planetary gears (4). The bevel teeth of each half-shaft gear (6) mesh with the bevel teeth on one side of the four planetary gears (4). The half-shaft gear washers (7) are sleeved on the outer end of the half-shaft gears (6), and the two half-shaft gear washers (7) are in limited contact with the inner wall of the corresponding left differential housing (1) and the inner wall of the right differential housing (2).

10. A differential assembly, characterized in that: Including a planetary gear shim anti-rotation structure as described in any one of claims 1-9.

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