Differential mechanism for axle

Abstract

The differential mechanism for the axle comprises a differential mechanism shell, a planetary gear, a cross shaft and a cross shaft support are installed in the differential mechanism shell, the planetary gear is installed on the cross shaft in a sleeved mode, the cross shaft is installed in the cross shaft support, and the cross shaft support is located in the middle of the differential mechanism shell. A rolling assembly is arranged between the planetary gear and the cross shaft, an inner hole of the planetary gear is a stepped hole, the outer side of the rolling assembly is limited through a circular bead of the planetary gear, and the inner side of the rolling assembly is limited through a cross shaft support. The roller pin assembly is arranged between the planetary gear and the cross shaft, and sliding friction between the planetary gear and the cross shaft is changed into rolling friction, so that the heat productivity and abrasion of the contact part are reduced, and the reliability of a product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of differentials, in particular to a differential for a vehicle axle. Background Art

[0002] At present, the axle differential structure is mainly a direct contact transmission between the planetary gear and the cross shaft. The planetary gear and the cross shaft are in direct contact with each other because of sliding friction. Under high differential conditions, the relative sliding speed between the two is large, the heat is large, and ablation and excessive wear are very likely to occur, resulting in differential failure. At the same time, since the cross shaft is round, it is difficult to position it during installation, resulting in poor installation accuracy. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model provides a differential for an axle. The technical problems to be solved by the utility model are achieved through the following technical solutions:

[0004] A differential for an axle, comprising a differential housing, wherein a planetary gear, a cross shaft and a cross shaft support are installed in the differential housing, wherein the planetary gear is sleeved on the cross shaft, wherein the cross shaft is installed in the cross shaft support, and wherein the cross shaft support is located in the middle of the differential housing; a rolling assembly is arranged between the planetary gear and the cross shaft, wherein the inner hole of the planetary gear is a stepped hole, wherein the outer side of the rolling assembly is limited by the shoulder of the planetary gear, and the inner side is limited by the cross shaft support.

[0005] Furthermore, the cross-axis support is cylindrical, and its end face is provided with a through hole in the axial direction, and the circumferential surface is provided with a through hole in the radial direction. The cross-axis includes a long axis and two short axes, and the middle of the long axis has grooves on opposite sides. The middle of the long axis is located in the circumferential surface through hole of the cylindrical cross-axis support, and both ends extend into the differential housing. One end of the two short axes respectively extends from both ends of the through hole on the end face of the cylindrical cross-axis support and is clamped in the groove of the long axis, and the other end extends into the differential housing; the two sides of the circumferential surface through hole of the cylindrical cross-axis support are flat, and a shaft sleeve is arranged on the outside of the flat surface. The shaft sleeve is mounted on the long axes at both ends of the cylindrical cross-axis support and limits the inner side of the rolling assembly.

[0006] Furthermore, the cross-axis support is in the shape of a cube, and its end faces in three directions are provided with through holes. The cross-axis includes four short shafts, which are arranged opposite to each other in pairs, and the opposite ends extend from the two ends of the through holes, and the other end is fixed in the differential housing by a cylindrical pin. Another through hole of the cube-shaped cross-axis support is connected to other parts that cooperate with the differential. A shaft sleeve is arranged between the inner side of the rolling assembly and the cube-shaped cross-axis support, and the shaft sleeve is mounted on the cross-axis and limits the inner side of the rolling assembly.

[0007] Furthermore, a spherical wear-resistant gasket is provided between the planetary gear and the inner wall of the differential housing.

[0008] Furthermore, the cross-axis support is spherical, the spherical cross-axis support is a hollow structure, and the two opposite surfaces are planes. The cross-axis includes four short axes, and the short axes are all located on one side of the circumferential surface of the spherical cross-axis support and are integrally formed with the cross-axis support. An internal spline is provided on the inner wall of the spherical cross-axis support; a gasket is provided between the inner side of the rolling assembly and the spherical cross-axis support, and the gasket is mounted on the cross-axis and limits the inner side of the rolling assembly.

[0009] Furthermore, the side of the gasket that contacts the spherical cross-axis support is a spherical surface, and the side that contacts the rolling component is a plane.

[0010] Preferably, the rolling assembly is a single-row needle roller assembly or a double-row needle roller assembly.

[0011] Beneficial effects of the utility model:

[0012] 1. Under the working conditions of high torque and high differential speed of the vehicle, by setting the needle roller assembly between the planetary gear and the cross shaft, the sliding friction between the planetary gear and the cross shaft is changed into rolling friction, so as to reduce the heat generation and wear of the contact part, so as to better adapt to the working conditions of high differential speed and improve the reliability of the product. At the same time, the needle roller assembly is limited by the shoulder and sleeve of the planetary gear, or the shoulder and the gasket, so that the needle roller assembly can be stably fixed between the planetary gear and the cross shaft to ensure the normal operation of the planetary gear, and the sleeve can prevent the cross shaft support from being directly worn, thereby further ensuring the normal operation of the cross shaft;

[0013] 2. The problem of poor installation and positioning accuracy of the existing differential cross shaft is solved by setting a cylindrical cross shaft support, a cubic cross shaft support and an integrated spherical cross shaft support, thereby effectively improving the reliability of the differential operation.

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the internal structure of the differential of Example 1;

[0016] Figure 2 for Figure 1 A schematic diagram of a local enlarged structure;

[0017] Figure 3 It is a structural schematic diagram of a cylindrical cross-axis support;

[0018] Figure 4 It is a schematic diagram of the structure of the shaft sleeve;

[0019] Figure 5 is a schematic diagram of the internal structure of the differential of Example 2;

[0020] Figure 6 It is a structural schematic diagram of a cubic cross-axis support;

[0021] Figure 7 is a schematic diagram of the internal structure of the differential of Example 3;

[0022] Figure 8 for Figure 7 A schematic diagram of the enlarged structure of part A;

[0023] Fig. 9 It is a structural schematic diagram of an integrated spherical cross-axis support.

[0024] Description of reference numerals:

[0025] 1-differential housing; 2-planetary gear; 3-cross shaft; 4-cross shaft support; 5-spherical wear-resistant gasket; 6-rolling assembly; 7-sleeve; 8-cylindrical pin; 9-gasket; 10-internal spline; 2-1-shoulder; 3-1-slot. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with specific embodiments, but the implementation methods of the present invention are not limited thereto.

[0027] Example 1

[0028] See also Figure 1~Figure 4 The embodiment of the utility model provides a differential for an axle, specifically comprising a differential case 1, wherein a planetary gear 2, a cross shaft 3 and a cross shaft support 4 are installed in the differential case 1, wherein the planetary gear 2 is sleeved on the cross shaft 3, and a spherical wear-resistant gasket 5 is arranged between the planetary gear 2 and the inner wall of the differential case 1, so as to effectively prevent the contact position between the two from being worn out prematurely; the cross shaft 3 is installed in the cross shaft support 4, and the cross shaft support 4 is located in the middle of the differential case 1; a rolling assembly 6 is arranged between the planetary gear 2 and the cross shaft 3, the inner hole of the planetary gear 2 is a step hole, the outer side of the rolling assembly 6 is limited by the shoulder 2-1 of the planetary gear 2, and the inner side is limited by the cross shaft support 4.

[0029] Preferably, the rolling assembly 6 is a single-row needle roller assembly or a double-row needle roller assembly.

[0030] Specifically, the cross shaft support 4 is cylindrical, and a through hole is opened in the axial direction on its end face, and a through hole is opened in the radial direction on the circumferential surface. The cross shaft 3 includes a long shaft and two short shafts, and the middle of the long shaft has a clamping groove 3-1 on the opposite sides. The middle of the long shaft is located in the through hole on the circumferential surface of the cylindrical cross shaft support, and the two ends extend out of the through hole and extend into the differential housing 1 respectively. One end of the two short shafts extends from the two ends of the through hole on the end face of the cylindrical cross shaft support and is clamped in the clamping groove 3-1 of the long shaft, and the other end extends into the differential housing 1.

[0031] The two sides of the circumferential surface through hole of the cylindrical cross-axis support are flat, and a sleeve 7 is arranged on the outside of the plane. The sleeve 7 is mounted on the long axis at both ends of the cylindrical cross-axis support, and limits the inner side of the rolling assembly 6 to ensure the normal installation of the needle roller assembly, thereby increasing product reliability. By arranging the sleeve 7, direct wear of the circumferential surface of the cylindrical cross-axis support by the needle roller assembly when the planetary gear 2 is working can be avoided, and the cross shaft 3 is indirectly protected. At the same time, by designing the two sides of the circumferential surface of the cylindrical cross-axis support that contacts the sleeve 7 as flat, the reliable positioning of the sleeve 7 is also guaranteed.

[0032] In addition, providing a cylindrical cross-axis support can also enhance the rigidity of the cross-axis 3, prevent the cross-axis 3 from bending or breaking due to force, and ensure the normal operation of the differential; at the same time, providing a cylindrical cross-axis support also solves the problem of poor installation and positioning accuracy of the conventional cross-axis 3, and effectively improves the reliability of the differential operation.

[0033] Example 2

[0034] See also Figure 5~Figure 6 The embodiment of the utility model provides another axle differential, specifically comprising a differential case 1, wherein a planetary gear 2, a cross shaft 3 and a cross shaft support 4 are installed in the differential case 1, wherein the planetary gear 2 is sleeved on the cross shaft 3, and a spherical wear-resistant gasket 5 is arranged between the planetary gear 2 and the inner wall of the differential case 1, which can effectively prevent the contact position between the two from wearing out prematurely; the cross shaft 3 is installed in the cross shaft support 4, and the cross shaft support 4 is located in the middle of the differential case 1; a rolling assembly 6 is arranged between the planetary gear 2 and the cross shaft 3, the inner hole of the planetary gear 2 is a step hole, the outer side of the rolling assembly 6 is limited by the shoulder 2-1 of the planetary gear 2, and the inner side is limited by the cross shaft support 4.

[0035] Preferably, the rolling assembly 6 is a single-row needle roller assembly or a double-row needle roller assembly.

[0036] Specifically, the cross shaft support 4 is in a cubic shape, and through holes are opened on its end faces in three directions. The cross shaft 3 includes four short shafts, which are arranged opposite to each other in pairs, and the opposite ends extend from the two ends of the through holes, and the other end is fixed in the differential housing 1 by a cylindrical pin 8; another through hole of the cross shaft support 4 is connected to other parts that cooperate with the differential.

[0037] A shaft sleeve 7 is arranged between the inner side of the rolling assembly 6 and the cubic cross-axis support. The shaft sleeve is mounted on the cross-axis and limits the inner side of the rolling assembly 6. By arranging the shaft sleeve 7, direct wear of the end face of the cubic cross-axis support by the needle roller assembly can be avoided when the planetary gear 2 is working, thereby indirectly protecting the cross-axis 3.

[0038] In addition, providing a cubic cross-axis support can also enhance the rigidity of the cross-axis 3, prevent the cross-axis 3 from bending or breaking due to force, and ensure the normal operation of the differential; at the same time, providing a cubic cross-axis support also solves the problem of poor installation and positioning accuracy of the conventional cross-axis 3, and effectively improves the reliability of the differential operation.

[0039] Example 3

[0040] See also Figure 7~Figure 9 The embodiment of the utility model provides another axle differential, specifically comprising a differential housing 1, wherein a planetary gear 2, a cross shaft 3 and a cross shaft support 4 are installed in the differential housing 1, wherein the planetary gear 2 is sleeved on the cross shaft 3; the cross shaft 3 is installed in the cross shaft support 4, and the cross shaft support 4 is located in the middle of the differential housing 1; a rolling assembly 6 is arranged between the planetary gear 2 and the cross shaft 3, wherein the inner hole of the planetary gear 2 is a step hole, and the outer side of the rolling assembly 6 is limited by the shoulder 2-1 of the planetary gear 2, and the inner side is limited by the cross shaft support 4.

[0041] Preferably, the rolling assembly 6 is a single-row needle roller assembly or a double-row needle roller assembly.

[0042] Specifically, the cross-axis support 4 is spherical, the spherical cross-axis support is a hollow structure, and the two opposite surfaces are planes. The cross-axis 3 includes four short axes, and the short axes are all located on one side of the circumferential surface of the cross-axis support 4 and are integrally formed with the cross-axis support 4, thereby facilitating processing and manufacturing. At the same time, the short axes and the spherical cross-axis support are designed as one, which also avoids the problem of poor positioning accuracy during on-site installation of the short axes; a gasket 9 is arranged between the inner side of the rolling assembly 6 and the spherical cross-axis support, and the gasket 9 is mounted on the cross-axis and limits the inner side of the rolling assembly 6; the side of the gasket 9 in contact with the cross-axis support 4 is spherical, and the side in contact with the rolling assembly 6 is flat, thereby ensuring that the gasket 9 is completely fitted with the spherical cross-axis support and the rolling assembly 6, better exerting its limiting function, and also protecting the spherical cross-axis support.

[0043] An internal spline 10 is provided on the inner wall of the spherical cross shaft support, and the internal spline 10 is connected to other parts that cooperate with the differential. The gasket 9 provided can further prevent the spherical cross shaft support from being worn, thereby ensuring the normal operation of other parts.

[0044] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A differential for an axle, characterized in that: It includes a differential case, in which planetary gears, a cross shaft and a cross shaft support are installed, the planetary gears are sleeved on the cross shaft, the cross shaft is installed in the cross shaft support, and the cross shaft support is located in the middle of the differential case; a rolling assembly is arranged between the planetary gears and the cross shaft, the inner hole of the planetary gear is a step hole, the outer side of the rolling assembly is limited by the shoulder of the planetary gear, and the inner side is limited by the cross shaft support.

2. The axle differential according to claim 1, characterized in that: The cross shaft support is cylindrical, and its end face is provided with a through hole in the axial direction, and the circumferential surface is provided with a through hole in the radial direction. The cross shaft includes a long shaft and two short shafts. The middle part of the long shaft has grooves on opposite sides. The middle part of the long shaft is located in the circumferential surface through hole of the cylindrical cross shaft support, and both ends extend into the differential housing. One end of the two short shafts respectively extends from both ends of the through hole of the end face of the cylindrical cross shaft support and is clamped in the groove of the long shaft, and the other end extends into the differential housing; the two sides of the circumferential surface through hole of the cylindrical cross shaft support are flat, and a shaft sleeve is arranged on the outer side of the flat surface. The shaft sleeve is mounted on the long shafts at both ends of the cylindrical cross shaft support and limits the inner side of the rolling assembly.

3. The axle differential according to claim 1, characterized in that: The cross shaft support is in the shape of a cube, and through holes are provided on the end faces in three directions. The cross shaft includes four short shafts, which are arranged opposite to each other in pairs, and the opposite ends extend from the two ends of the through holes, and the other end is fixed in the differential housing through a cylindrical pin. Another through hole of the cube-shaped cross shaft support is connected to other parts that cooperate with the differential. A shaft sleeve is provided between the inner side of the rolling assembly and the cube-shaped cross shaft support, and the shaft sleeve is mounted on the cross shaft and limits the inner side of the rolling assembly.

4. The axle differential according to claim 2 or 3, characterized in that: A spherical wear-resistant gasket is arranged between the planetary gear and the inner wall of the differential housing.

5. The axle differential according to claim 1, characterized in that: The cross-axis support is spherical, the spherical cross-axis support is a hollow structure, and the two opposite surfaces are planes. The cross-axis includes four short axes, and the short axes are all located on one side of the circumferential surface of the spherical cross-axis support and are integrally formed with the cross-axis support. An internal spline is provided on the inner wall of the spherical cross-axis support; a gasket is provided between the inner side of the rolling assembly and the spherical cross-axis support, and the gasket is mounted on the cross-axis and limits the inner side of the rolling assembly.

6. The axle differential according to claim 5, characterized in that: The side of the gasket that contacts the spherical cross-axis support is a spherical surface, and the side that contacts the rolling component is a plane.

7. The axle differential according to claim 1, characterized in that: The rolling assembly is a single-row needle roller assembly or a double-row needle roller assembly.

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