Eight-fairway DO constant velocity universal joint and transmission shaft assembly

Abstract

The utility model discloses an eight-fairway DO constant velocity universal joint and transmission shaft assembly, and relates to the field of transmission shaft assembly.The eight-fairway DO constant velocity universal joint comprises a front fixed end ball cage type universal joint assembly and the like, one end of a front shaft tube is connected with a front shaft head, the front fixed end ball cage type universal joint assembly is assembled at the end of the front shaft head, and the other end of the front shaft tube is connected with a cylindrical shell; a starlike sleeve is arranged in the cylindrical shell, eight groups of raceways are uniformly distributed between the inner wall of the cylindrical shell and the outer wall of the starlike sleeve in the circumferential direction, and eight steel balls B are kept in the corresponding raceways through retainers B; one end of the rear shaft tube is connected with a rear shaft head, the end part of the rear shaft head is assembled with a rear fixed end ball cage type universal joint assembly, the other end of the rear shaft tube is connected with a middle shaft head, the middle shaft head is riveted and sealed with the opening part of the cylindrical shell through a connecting sleeve B and a dust cover B, and the middle part of the middle shaft head is supported through a middle support. The constant velocity universal joint solves the problem that the size of a bell-shaped shell and a starlike sleeve channel of an existing constant velocity universal joint is large, so that the overall size of the universal joint is large.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of transmission shaft assembly, concretely relates to an eight ball track DO constant velocity universal joint and transmission shaft assembly. BACKGROUND

[0002] In the automobile transmission system and other systems, in order to realize the power transmission between two shafts of which the axes do not coincide, it is necessary to use universal joint transmission device. At present, there are many kinds of universal joints, which can be divided into rigid universal joint and flexible universal joint according to whether the universal joint has obvious elasticity in the torsion direction, and the rigid universal joint can be divided into three kinds of unequal speed universal joint, quasi constant velocity universal joint and constant velocity universal joint. Among them, the constant velocity universal joint is the mechanism that connects two axes of which the axes do not coincide and makes the two axes transmit motion at the same angular velocity, which has the advantages of stable transmission and reliability, and is widely used in the transmission shaft of the automobile.

[0003] In the existing automobile transmission shaft, the transmission member with the functions of rotation angle and telescopic extension is needed, and the traditional transmission shaft structure is completed by the cooperation of universal joint and spline pair, and the function of rotation angle and sliding can be realized by one constant velocity universal joint. The inner surface of the star-shaped sleeve of the fixed type ball cage type universal joint on the structure of the constant velocity universal joint is connected with the transmission shaft by the inner spline, and the outer surface is provided with six arc-shaped grooves as the inner raceway of the steel ball, and the outer raceway is made on the inner surface of the spherical shell. One steel ball is arranged in each of the six raceways formed after the star-shaped sleeve and the spherical shell are combined, and the six steel balls are kept in the same plane by the retainer (ball cage), and the power is transmitted by the transmission shaft, the steel ball and the spherical shell. On the basis of meeting the transmission torque and fatigue endurance requirements, the size of the bell-shaped shell and the star-shaped sleeve channel of the existing six ball track constant velocity universal joint is large, so that the overall size of the universal joint is large. In addition, the inner and outer raceways of the existing VL type universal joint (inclined raceway universal joint) are cylindrical, but the center line of the cylinder (raceway center line) is not parallel to the axis, but is inclined at the same angle relative to the axis, and the inclined directions of the two adjacent raceways on the same part are opposite, that is, in the shape of "V". After being combined, the inclined directions of the inner and outer raceways at the same circumferential position are just opposite, that is, symmetrical intersection, and the steel ball is at the intersection part of the inner and outer raceways, realizing the axial sliding and limiting, but the inclined raceway will produce axial force when transmitting power, which will lose transmission efficiency, and the sliding stroke of the inclined raceway is also reduced under the same external size. SUMMARY

[0004] The utility model discloses a purpose lies in overcoming the deficiency that present technique has, and provide a kind of eight ball path DO constant velocity universal joint and transmission shaft assembly, solve the problem that the size of the clock shell and star-shaped sleeve channel of present constant velocity universal joint is larger, make the overall volume of universal joint be larger. And present VL type universal joint (inclined raceway universal joint) when transmitting power, axial force will be generated, loss transmission efficiency, while improving under the equivalent external size, the sliding stroke of inclined raceway is also reduced accordingly. In addition, compared with the present six ball path VL constant velocity universal joint, the overall transmission shaft profile size of eight ball path DO constant velocity universal joint (double offset barrel type universal joint) transmission shaft is smaller, reduce the axial force generated in the process of transmitting power, improve transmission efficiency, have better adaptability to vehicle chassis layout space.

[0005] The utility model discloses a purpose lies in overcoming the deficiency that present technique has, and provide a kind of eight ball path DO constant velocity universal joint and transmission shaft assembly, solve the problem that the size of the clock shell and star-shaped sleeve channel of present constant velocity universal joint is larger, make the overall volume of universal joint be larger. And present VL type universal joint (inclined raceway universal joint) when transmitting power, axial force will be generated, loss transmission efficiency, while improving under the equivalent external size, the sliding stroke of inclined raceway is also reduced accordingly. In addition, compared with the present six ball path VL constant velocity universal joint, the overall transmission shaft profile size of eight ball path DO constant velocity universal joint (double offset barrel type universal joint) transmission shaft is smaller, reduce the axial force generated in the process of transmitting power, improve transmission efficiency, have better adaptability to vehicle chassis layout space.

[0006] As a further technical scheme, the front fixed end ball cage type universal joint assembly and the rear fixed end ball cage type universal joint assembly adopt the same structure, and each include an inner ring, a plurality of steel balls A installed on the inner ring raceway, and a retainer A for retaining the steel balls A.

[0007] As a further technical scheme, the inner ring of the front fixed end ball cage type universal joint assembly is connected to the front axle head through a spline transmission, and the front fixed end ball cage type universal joint assembly is also riveted and sealed with the front axle head through a connecting sleeve A and a dust cover A.

[0008] As a further technical scheme, the inner ring of the rear fixed end ball cage type universal joint assembly is connected to the rear axle head through a spline transmission, and the rear fixed end ball cage type universal joint assembly is also riveted and sealed with the rear axle head through a connecting sleeve A and a dust cover A.

[0009] As a further technical scheme, the front axle tube is respectively welded and fixed with the front axle head and the barrel type shell, and the rear axle tube is respectively welded and fixed with the intermediate axle head and the rear axle head.

[0010] As a further technical solution, a steel wire clamp spring is installed at a position close to the mouth of the cylindrical shell inner cavity.

[0011] As a further technical solution, an O-ring is installed at a position close to the mouth of the cylindrical shell outer wall, for sealing cooperation with the connecting sleeve B.

[0012] As a further technical solution, the raceways opened on the cylindrical shell and the star-shaped sleeve are straight raceways.

[0013] As a further technical solution, a shaft clamp spring is installed on the middle shaft head, for axially limiting the middle shaft head and the star-shaped sleeve.

[0014] The utility model discloses the beneficial effect is:

[0015] 1, the front shaft head is assembled front fixed end ball cage type universal joint assembly, and the rear shaft head is assembled rear fixed end ball cage type universal joint assembly, the original cross type universal joint is replaced by ball cage type universal joint assembly, avoids the stall phenomenon in the power transmission process due to the original ten shaft universal joint unequal speed, under the condition of same rotary diameter, the installation size of ball cage type constant velocity universal coupling is less than the installation size of cross shaft universal coupling, and the shortest size is far less than the installation size of cross shaft, simultaneously, the fixed end ball cage type universal joint has constant velocity, inhibits the adverse effect of various vibrations and impacts generated by the speed and torque change to the associated equipment, can inhibit the adverse effect of various vibrations and impacts generated by the speed and torque change to the associated equipment, the speed change is small, and the power transmission efficiency is higher.

[0016] 2, eight steel balls are uniformly distributed on the outer side of the star-shaped sleeve in the circumferential direction and are kept by the retainer, so that the steel balls can realize constant speed torque transmission in any direction.

[0017] 3, the connecting sleeve and the dust cover are riveted and pressed with the front shaft head, so that foreign matters in the outside can enter the ball cage, effectively reducing the abrasion of the ball surface and the raceway, and prolonging the service life of the universal joint.

[0018] 4, the raceways of the star-shaped sleeve and the cylindrical shell are straight raceways, the universal joint is reduced in size, compared with the existing VL type universal joint (inclined raceway universal joint), under the condition of same external size, the DO constant velocity universal joint of the straight raceway is effectively improved by 22 % in swing angle; the overall transmission shaft is smaller in size, the axial force generated in the power transmission process is reduced by more than 58 %, the transmission efficiency loss is reduced by more than 14 %, the weight is reduced by 7 % in light weight design, and the space arrangement of the whole vehicle chassis has better adaptability, the rotary body is more stable in the dynamic balance process, and the dynamic balance efficiency is effectively improved by more than 10 %. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structural schematic diagram of the utility model.

[0020] Figure 2 For Figure 1 Local enlarged view of the A area.

[0021] Figure 3 Structure diagram of the star-shaped sleeve in the utility model.

[0022] Figure 4 Structure diagram of the cylindrical shell in the utility model.

[0023] Reference signs: front fixed end ball cage type universal joint assembly 1, steel ball A 2, retainer A 3, inner ring 4, connecting sleeve A 5, dust cover A 6, front shaft head 7, front shaft tube 8, cylindrical shell 9, steel wire clamp spring 10, O-ring 11, connecting sleeve B 12, dust cover B 13, intermediate shaft head 14, intermediate support 15, rear shaft tube 16, rear shaft head 17, rear fixed end ball cage type universal joint assembly 18, retainer B 19, steel ball B 20, star-shaped sleeve 21, shaft clamp spring 22. DETAILED DESCRIPTION

[0024] The utility model will be described in detail below in combination with the drawings:

[0025] Embodiment: as shown in the accompanying Figures 1 to 4 The eight-ball path DO constant velocity universal joint and transmission shaft assembly, including front fixed end ball cage type universal joint assembly 1, steel ball A 2, retainer A 3, inner ring 4, connecting sleeve A 5, dust cover A 6, front shaft head 7, front shaft tube 8, cylindrical shell 9, steel wire clamp spring 10, O-ring 11, connecting sleeve B 12, dust cover B 13, intermediate shaft head 14, intermediate support 15, rear shaft tube 16, rear shaft head 17, rear fixed end ball cage type universal joint assembly 18, retainer B 19, steel ball B 20, star-shaped sleeve 21 and shaft clamp spring 22.

[0026] Reference the accompanying Figure 1The front end of the front axle tube 8 is connected to the front axle head 7. The front end of the front axle head 7 is equipped with a front fixed end ball cage universal joint assembly 1. The rear end of the front axle tube 8 is connected to a cylindrical shell 9. A star-shaped sleeve 21 is provided inside the cylindrical shell 9. Eight sets of raceways are evenly distributed along the circumferential direction between the inner wall of the cylindrical shell 9 and the outer wall of the star-shaped sleeve 21. Eight steel balls B20 are held in the corresponding raceways by a retainer B19, so that the steel balls B20 can transmit torque at a constant speed in any direction within the raceways. The rear end of the rear axle tube 16 is connected to the rear axle head 17. The end of the rear axle head 17 is equipped with a rear fixed end ball cage universal joint assembly 18. The other end of the rear axle tube 16 is connected to the intermediate axle head 14. The intermediate axle head 14 and the star-shaped sleeve 21 are connected by a spline for transmission. The intermediate axle head 14 is riveted and sealed to the opening of the cylindrical shell 9 by a connecting sleeve B12 and a dust cover B13. The middle part of the intermediate axle head 14 is supported by an intermediate support 15. Furthermore, the inner ring 4 of the front fixed-end ball cage universal joint assembly 1 is connected to the front axle head 7 via a spline for transmission. The front fixed-end ball cage universal joint assembly 1 is also riveted and sealed to the front axle head 7 via a connecting sleeve A5 and a dust cover A6. The inner ring 4 of the rear fixed-end ball cage universal joint assembly 18 is connected to the rear axle head 17 via a spline for transmission. The rear fixed-end ball cage universal joint assembly 18 is also riveted and sealed to the rear axle head 17 via a connecting sleeve A5 and a dust cover A6.

[0027] Preferably, dust covers A6 and B13 are effectively sealed with rubber material, thereby avoiding frequent maintenance and reducing the labor intensity of workers. The other end of dust cover B13 is connected to the intermediate shaft head 14, and the other end of dust cover A6 is connected to the front shaft head 7, thereby preventing foreign objects from entering the ball cage, effectively reducing wear on the ball surface and raceway, and improving the service life of the universal joint.

[0028] like Figure 1 As shown, the front fixed end ball cage universal joint assembly 1 and the rear fixed end ball cage universal joint assembly 18 adopt the same structure, both including an inner ring 4, several steel balls A2 installed on the ball track of the inner ring 4, and a cage A3 that can hold the steel balls A2.

[0029] Furthermore, such as Figure 2 As shown, a wire retaining ring 10 is installed near the opening of the inner cavity of the cylindrical shell 9. An O-ring 11 is installed on the outer wall of the cylindrical shell 9 near the opening, which can cooperate with the connecting sleeve B12 for sealing. The raceways on the cylindrical shell 9 and the star sleeve 21 are all straight raceways, which effectively increases the swing angle of the DO constant velocity universal joint by 22%. In addition, compared with the existing six-ball-track VL constant velocity universal joint, the eight-ball-track DO constant velocity universal joint drive shaft has a smaller overall drive shaft size, reduces the axial force generated during power transmission by more than 58%, reduces the transmission efficiency loss by more than 14%, reduces the weight by 7% in the lightweight design, and has better adaptability to the overall vehicle chassis layout space. A shaft retaining ring 22 is installed on the intermediate axle head 14, which can axially limit the intermediate axle head 14 and the star sleeve 21.

[0030] Preferably, the front axle tube 8 is welded and fixed with the front axle head 7 and the barrel type shell 9 respectively, and the rear axle tube 16 is welded and fixed with the intermediate axle head 14 and the rear axle head 17 respectively.

[0031] The working process of the utility model is as follows:

[0032] In the utility model, the front axle tube 8 is welded and fixed with the front axle head 7 and the barrel type shell 9 respectively, and the rear axle tube 16 is welded and fixed with the intermediate axle head 14 and the rear axle head 17 respectively. Among them, the intermediate axle head 14, the star-shaped sleeve 21, the front fixed end ball cage type universal joint assembly 1 and the front axle head 7, the rear axle head 16 and the rear fixed end ball cage type universal joint assembly 18 are all connected through internal and external spline cooperation and transmit torque, the ball cage type universal joint assembly replaces the original cross axle universal joint, avoids the stall phenomenon in the power transmission process caused by the original cross axle universal joint due to the non-constant speed, and in the case of the same rotary diameter, the installation size of the ball cage type constant speed universal coupling is smaller than that of the cross axle universal coupling, and the shortest size is much smaller than that of the cross axle, and the fixed end ball cage type universal joint has constant speed, suppresses the adverse effects of various vibrations and impacts on the associated equipment caused by the change of speed and torque, can suppress the adverse effects of various vibrations and impacts on the associated equipment caused by the change of speed and torque, has small speed change and higher power transmission efficiency.

[0033] In addition, compared with the six-ball constant speed ball cage universal joint, the eight-ball DO constant speed universal joint and the transmission shaft assembly have more uniformly distributed steel balls in the circumferential direction, and in the dynamic balance process, the rotating body is more stable, and the dynamic balance efficiency is effectively improved. Specifically, the eight steel balls B20 are installed on the outer side of the star-shaped sleeve 21 in a circumferentially uniform manner and are retained by the retainer 19, so that the steel balls B20 can realize constant speed torque transmission in any direction in the raceway of the star-shaped sleeve 21 and the barrel type shell 9.

[0034] It can be understood that equivalent replacement or change of the technical scheme and the utility model concept of the utility model by those skilled in the art shall belong to the protection range of the claims attached to the utility model.

Claims

1. An eight-ball track DO constant velocity joint and propeller shaft assembly characterized by: The application relates to a front fixed-end ball-cage universal joint assembly (1), a front axle tube (8), a rear axle tube (16) and a rear fixed-end ball-cage universal joint assembly (18), one end of the front axle tube (8) is connected with a front axle head (7), the end of the front axle head (7) is equipped with the front fixed-end ball-cage universal joint assembly (1), the other end of the front axle tube (8) is connected with a barrel-shaped shell (9), a star-shaped sleeve (21) is arranged in the barrel-shaped shell (9), eight groups of raceways are uniformly distributed between the inner wall of the barrel-shaped shell (9) and the outer wall of the star-shaped sleeve (21) in the circumferential direction, eight steel balls B (20) are kept in the corresponding raceways through a retainer B (19), and the steel balls B (20) realize constant-speed torque transmission in any direction in the raceways; one end of the rear axle tube (16) is connected with a rear axle head (17), the end of the rear axle head (17) is equipped with the rear fixed-end ball-cage universal joint assembly (18), the other end of the rear axle tube (16) is connected with a middle axle head (14), the middle axle head (14) is connected with the star-shaped sleeve (21) through a spline transmission, the middle axle head (14) is riveted and sealed with the mouth of the barrel-shaped shell (9) through a connecting sleeve B (12) and a dust cover B (13), and the middle of the middle axle head (14) is supported through a middle support (15).

2. The eight-ball track DO constant velocity joint and drive shaft assembly of claim 1, wherein: The front fixed-end ball-cage universal joint assembly (1) and the rear fixed-end ball-cage universal joint assembly (18) adopt the same structure and all comprise an inner ring (4), a plurality of steel balls A (2) arranged on the raceway of the inner ring (4) and a retainer A (3) for keeping the steel balls A (2).

3. An eight-ball track DO constant velocity joint and drive shaft assembly according to claim 2, characterized in that: The inner ring (4) of the front fixed-end ball-cage universal joint assembly (1) is connected with the front axle head (7) through a spline transmission, and the front fixed-end ball-cage universal joint assembly (1) is also riveted and sealed with the front axle head (7) through a connecting sleeve A (5) and a dust cover A (6).

4. The eight-ball track DO constant velocity joint and drive shaft assembly of claim 2, wherein: The inner ring (4) of the rear fixed-end ball-cage universal joint assembly (18) is connected with the rear axle head (17) through a spline transmission, and the rear fixed-end ball-cage universal joint assembly (18) is also riveted and sealed with the rear axle head (17) through the connecting sleeve A (5) and the dust cover A (6).

5. An eight-ball track DO constant velocity joint and drive shaft assembly as described in claim 1, wherein: The front axle tube (8) is welded with the front axle head (7) and the barrel-shaped shell (9) respectively, and the rear axle tube (16) is welded with the middle axle head (14) and the rear axle head (17) respectively.

6. An eight-ball track DO constant velocity joint and drive shaft assembly as described in claim 1, wherein: A steel wire clasp (10) is arranged at a position close to the mouth of the inner cavity of the barrel-shaped shell (9).

7. An eight-ball track DO constant velocity joint and drive shaft assembly as described in claim 1, wherein: An O-shaped ring (11) is arranged on the outer wall of the barrel-shaped shell (9) at a position close to the mouth, and is used for sealing with the connecting sleeve B (12).

8. An eight-ball track DO constant velocity joint and drive shaft assembly as described in claim 1, wherein: The raceways arranged on the barrel-shaped shell (9) and the star-shaped sleeve (21) are straight raceways.

9. An eight-ball track DO constant velocity joint and drive shaft assembly as described in claim 1, wherein: An axle clasp (22) is arranged on the middle axle head (14) and is used for axially limiting the middle axle head (14) and the star-shaped sleeve (21).

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