A high-strength and long-life drive shaft assembly

Abstract

A high-strength and long-life drive shaft assembly. It mainly solves the problem that the edges of the conventional drive shaft retainer are sharp corners, which are prone to local stress concentration and affect the strength and service life. It is characterized by: it also includes a retainer, which is arranged in the shell, and the retainer includes an annular wall body, and the wall body is provided with a plurality of pockets for installing rolling elements, and the circumferential outer wall and the circumferential inner wall of the wall body are connected by an arc surface. The utility model provides a high-strength and long-life drive shaft assembly, which effectively distributes the external force on the retainer to the product structure through the arc surface transition retainer edge, avoids local stress concentration, and prevents the drive shaft from being greatly deformed due to long-term cyclic torque or short-term overload torque. Large deformation inside the structure can easily lead to damage to the drive shaft. The drive shaft assembly with a practical high-strength retainer structure ensures that the power transmission of the constant velocity joint does not fail due to retainer rupture, and effectively extends the service life of the drive shaft.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to a high-strength and long-life drive shaft assembly. Background Art

[0002] With the continuous development of the automobile industry, people have higher and higher requirements for the performance of new energy vehicles. In order to make the output shaft and the input shaft in the same plane rotate at the same speed in the automobile transmission system, a constant velocity joint drive shaft assembly with double universal joint transmission is often used. The constant velocity joint drive shaft assembly is a power transmission device between the automobile engine and the drive wheel, which is used to provide the traction and vehicle speed required by the automobile under various working conditions, and at the same time make the two able to change in a coordinated manner and have a sufficient range of change to ensure that the left and right drive wheels of the automobile can adapt to the differential requirements. Therefore, the performance and quality of the constant velocity joint drive shaft assembly directly affect the vehicle performance and driving safety of the automobile. In the prior art, the structure of the constant velocity joint drive shaft assembly is generally as follows: one end is a fixed-joint fixed ball cage universal joint, the other end is a movable-joint telescopic ball cage universal joint, and in the middle is an intermediate shaft connecting the fixed joint and the movable joint. Among them, the fixed joint is mainly composed of a bell-shaped shell, a retaining frame, a steel ball, and a star-shaped sleeve; the movable joint is composed of an outer shell and a retaining frame, a steel ball, and a star-shaped sleeve; the fixed joint and the movable joint are connected to the intermediate shaft through splines and fixed with elastic retaining rings.

[0003] As shown in the Chinese patent publication number CN 117662626 A, the edges of conventional retainers are sharp corners, which are prone to local stress concentration, affecting strength and service life. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the utility model provides a high-strength and long-life drive shaft assembly, which mainly solves the problem that the edges of the conventional drive shaft retainer are sharp corners and prone to local stress concentration, thus affecting the strength and service life.

[0005] The technical solution of the utility model is:

[0006] A high-strength and high-life drive shaft assembly includes an intermediate shaft, one end of which is provided with a first universal joint, and the other end of which is provided with a second universal joint, the first universal joint includes a shell, and also includes a retaining frame arranged in the shell, the retaining frame includes an annular wall body, the wall body is provided with a plurality of pockets for mounting rolling elements, and the circumferential outer wall and the circumferential inner wall of the wall body are connected by an arc surface.

[0007] The arc surface is tangent to the circumferential outer wall of the wall body.

[0008] The arc surface is tangent to the circumferential inner wall of the wall body.

[0009] The second universal joint comprises a bell-shaped housing, in which an elastic member is arranged, one end of the elastic member presses against the inner wall of the bell-shaped housing, and the other end is used to apply force on the axial outer wall of the intermediate shaft extending into the bell-shaped housing.

[0010] The elastic member is a spring.

[0011] It also includes a top cover, which is arranged between the intermediate shaft and the elastic member.

[0012] The back of the top cover is provided with a groove for pressing the axial outer wall of the intermediate shaft.

[0013] A surrounding plate is provided at the circumferential edge of the front end surface of the top cover, and part of the spring is arranged in the surrounding plate.

[0014] The beneficial effects of the utility model are as follows: the utility model provides a high-strength and high-life drive shaft assembly, which effectively distributes the external force on the cage to the product structure through the arc surface transition cage edge, avoids local stress concentration, and prevents the drive shaft from being greatly deformed due to long-term cyclic torque or short-term overload torque. Large deformation inside the structure can easily lead to damage to the drive shaft. The drive shaft assembly with a practical high-strength cage structure ensures that the power transmission of the constant velocity universal joint does not fail due to cage rupture, and effectively extends the life of the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the utility model.

[0016] Figure 2 This is a schematic diagram of a retaining frame according to an embodiment of the utility model.

[0017] Figure 3 for Figure 1 A magnified schematic diagram of center A. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings: As shown in the figure, a high-strength and high-life drive shaft assembly includes an intermediate shaft 1, one end of the intermediate shaft is provided with a first universal joint 2, and the other end is provided with a second universal joint 3, the first universal joint includes a housing 21, and also includes

[0019] The cage 4 is arranged in the housing. The cage includes an annular wall 41. The wall is provided with a plurality of pockets 44 for mounting rolling elements 42. The circumferential outer wall and the circumferential inner wall of the wall are connected by an arc surface 43. The edge of the cage is transitioned by the arc surface, and the external force on the cage is effectively distributed to the product structure, avoiding local stress concentration and preventing the drive shaft from being greatly deformed due to long-term cyclic torque or short-term overload torque. Large deformation inside the structure can easily lead to damage to the drive shaft. The drive shaft assembly with a practical high-strength cage structure ensures that the power transmission of the constant velocity universal joint does not fail due to the cracking of the cage, and effectively extends the life of the drive shaft. Based on the simulation results before and after optimization, it is known that the maximum stress before optimization is 267.64MPa, and after optimization is 113.61MPa; the stress at the weak position of the cage before optimization is 66.63MPa, and the stress at the weak position after optimization is 46.46MPa. It shows that the structure can effectively reduce stress concentration.

[0020] In this embodiment, as shown in the figure, the arcuate surface is tangent to the circumferential outer wall of the wall body.

[0021] In this embodiment, as shown in the figure, the arcuate surface is tangent to the circumferential inner wall of the wall body.

[0022] In this embodiment, as shown in the figure, the second universal joint comprises a bell-shaped housing 31, in which an elastic member 32 is arranged, one end of which presses against the inner wall of the bell-shaped housing, and the other end is used to apply force on the axial outer wall of the intermediate shaft extending into the bell-shaped housing, so as to play a role of buffering and resetting during axial expansion and contraction.

[0023] In this embodiment, as shown in the figure, the elastic member is a spring.

[0024] In this embodiment, as shown in the figure, a top cover 5 is further included, which is arranged between the intermediate shaft and the elastic member.

[0025] In this embodiment, as shown in the figure, the back of the top cover is provided with a groove 52 for pressing the axial outer wall of the intermediate shaft. The contact surface is larger and the use effect is better.

[0026] In this embodiment, as shown in the figure, a circumferential edge of the front end surface of the top cover is provided with a panel 51, and part of the spring is arranged in the panel to prevent the spring from falling out.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] The embodiments described with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention. The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A high-strength and high-life drive shaft assembly, comprising an intermediate shaft (1), one end of the intermediate shaft being provided with a first universal joint (2), and the other end being provided with a second universal joint (3), the first universal joint comprising a housing (21), characterized in that: Also includes A retainer (4) is disposed in the housing, the retainer comprising an annular wall body (41), the wall body being provided with a plurality of pockets (44) for mounting rolling elements (42), the circumferential outer wall and the circumferential inner wall of the wall body being connected via an arc surface (43).

2. A high-strength and long-life drive shaft assembly according to claim 1, characterized in that: The arc surface is tangent to the circumferential outer wall of the wall body.

3. A high-strength and long-life drive shaft assembly according to claim 1 or 2, characterized in that: The arc surface is tangent to the circumferential inner wall of the wall body.

4. The high-strength and long-life drive shaft assembly according to claim 1, characterized in that: The second universal joint comprises a bell-shaped housing (31), an elastic member (32) being arranged in the bell-shaped housing, one end of the elastic member being pressed against the inner wall of the bell-shaped housing, and the other end being used to apply force to the axial outer wall of the intermediate shaft extending into the bell-shaped housing.

5. The high-strength and long-life drive shaft assembly according to claim 4, characterized in that: The elastic member is a spring.

6. The high-strength and long-life drive shaft assembly according to claim 5, characterized in that: It also includes a top cover (5) which is arranged between the intermediate shaft and the elastic member.

7. The high-strength and long-life drive shaft assembly according to claim 6, characterized in that: The back of the top cover is provided with a groove (52) for pressing the axial outer wall of the intermediate shaft.

8. The high-strength and long-life drive shaft assembly according to claim 7, characterized in that: A surrounding plate (51) is provided at the circumferential edge of the front end surface of the top cover, and part of the spring is arranged in the surrounding plate.

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