Anti-drop fork groove type constant velocity universal joint

Abstract

The present invention discloses an anti-slip fork groove type constant velocity universal joint, comprising a CG outer ring, a cage, a CG inner ring and n circumferentially uniformly distributed steel balls placed in a cage window; a convex ridge is arranged on the vertical section of the entire raceway generatrix near the side edge of the shaft of the inner raceway of the CG outer ring; the convex ridge is a circular arc, and the convex ridge and the inner raceway of the CG outer ring are connected by a transition arc A and a transition arc B. The present invention has high anti-slip reliability, greatly reduces the occurrence of blocking failure problems, improves production efficiency, reduces the labor intensity of workers, and saves manufacturing costs.

Description

Technical Field

[0001] The invention belongs to the field of automobile parts and relates to a constant velocity universal joint, in particular to an anti-dropout fork groove type constant velocity universal joint. Background Art

[0002] The anti-drop structure of the fork groove type constant velocity universal joint is mainly to prevent the universal joint steel ball from falling off and causing failure due to excessive joint angle and excessive external sliding distance before the drive shaft is installed on the vehicle, during the drive shaft assembly, logistics transportation and loading of the drive shaft. At present, there are two main anti-drop structures of fork groove type constant velocity universal joints. One is the anti-drop structure of the disc type fork groove type constant velocity universal joint, which is mainly provided with a sealing sleeve 05 on the fork groove type constant velocity universal joint on the shaft side, such as Figure 1 and Figure 2 As described above, the sealing sleeve cover 05 is connected with the outer surface of the CG outer ring 01 by interference fit, and the inner surface of the sealing sleeve cover 05 is provided with a blocking groove, which prevents the steel ball 04 from falling off; 02 is a retaining frame, and 03 is a CG inner ring. The other is the anti-drop structure of the handle type fork groove type constant velocity universal joint, such as Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, after the fork groove type constant velocity universal joint is assembled, a pit 006 is pressed on the edge of the inner raceway on the side of the universal joint close to the shaft rod. The number of pits 006 is generally one or two pits per raceway. 001 is the CG outer ring, 002 is the retainer, and 003 is the CG inner ring. The pit is pressed using a special tool to deform the edge of the raceway to form a protrusion 005, which is used to prevent the steel ball 004 from falling out. For the anti-falling structure of the pit, since only one or two pits are set on one raceway, the blocking force on the steel ball 004 is small. Under the condition of a specific large angle of the universal joint, there is a situation where the steel ball cannot be reliably blocked, and the blocking failure problem occurs, causing the universal joint to be unusable, thereby causing the drive shaft to be scrapped. The investment in pit pressing tooling and equipment and the increased working hours of the pit pressing process will also increase the cost of the fork groove type constant velocity universal joint. The anti-drop structure of the sealing sleeve cover mainly increases the parts cost and assembly cost, resulting in high production cost of the disc-type fork groove constant velocity universal joint, time-consuming and labor-intensive, and low production efficiency; and the sealing sleeve cover 05 is easily dropped off due to the squeezing of the steel ball, resulting in the problem of blocking failure. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide an anti-dropout fork groove type constant velocity universal joint, which has high anti-dropout reliability, greatly reduces the occurrence of blocking failure problems, improves production efficiency, reduces the labor intensity of workers, and saves manufacturing costs.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: an anti-dropout fork groove type constant velocity universal joint, comprising a CG outer ring, a retaining frame, a CG inner ring and n circumferentially evenly distributed steel balls placed in the retaining frame window; a convex ridge is provided on the vertical section of the entire raceway generatrix near the side edge of the shaft of the inner raceway of the CG outer ring; the convex ridge is a circular arc, and the convex ridge and the inner raceway of the CG outer ring are connected by transition arc A and transition arc B.

[0005] Further preferably, the radius of the transition arc A is R1=10~14mm, the radius of the arc is R2=3~15mm, and the radius of the transition arc B is R3=10~14mm; the arcs are tangent to the transition arc A and the transition arc B respectively; and the protrusion height of the arc is 0.04~0.12mm higher than the protrusion height of the transition arc A and the transition arc B.

[0006] Further preferably, the number n of the steel balls is 4 or 5 or 6 or 7 or 8 or 9 or 10.

[0007] Further preferably, adjacent inner raceways or adjacent outer raceways of the fork groove type constant velocity universal joint are inclined in opposite directions and have the same slope; or one of the adjacent inner raceways or adjacent outer raceways is not inclined and the other is inclined at a positive angle; or one of the adjacent inner raceways or adjacent outer raceways is not inclined and the other is inclined at a negative angle; adjacent inner raceways or adjacent outer raceways are inclined in opposite directions and have different slopes.

[0008] The present invention is mainly used for disc type fork groove type constant velocity universal joints, and can also be used for handle type fork groove type constant velocity universal joints. The end with convex ridges is connected with the shaft rod end of the driving shaft, replacing the sealing sleeve cover to control the steel ball from falling out, and the other end has no convex ridges and is connected with the output flange of the driving and transmission end, and the steel ball is controlled to not fall out by the interference between the output flange and the steel ball.

[0009] Compared with the prior art, the advantages of the present invention are as follows: since the anti-slip structure of the present invention adopts the arrangement of ridges on the edge of the inner raceway or the outer raceway, the ridges can be directly formed during the grinding or hard milling process of the raceway. Compared with the pit-pressing anti-slip structure, there is no need to increase the investment in pit-pressing tooling and equipment, which reduces the pit-pressing process, reduces the labor intensity of workers, and saves manufacturing costs; and the ridges are arranged along the vertical section of the entire raceway generatrix, which increases the blocking area of ​​the steel ball, and the reliability of the steel ball anti-slip is higher; compared with the sealing sleeve cover anti-slip structure, there is no need to make the sealing sleeve cover, which reduces the material cost and the assembly cost of parts; and the ridges are integrally formed with the inner raceway or the outer raceway, and will not fall off due to the squeezing of the steel ball, which greatly reduces the occurrence of the blocking failure problem. In short, the anti-slip reliability of the present invention is high, which greatly reduces the occurrence of the blocking failure problem, improves production efficiency, reduces the labor intensity of workers, and saves manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1It is a front cross-sectional view of the existing disc-type fork groove type constant velocity universal joint drive shaft when the inner end is in a neutral position; Figure 2 It is a front sectional view of the existing disc type fork groove type constant velocity universal joint drive shaft when the shaft rod is moved to the left; Figure 3 It is a front cross-sectional view of the existing handle type fork groove type constant velocity universal joint when the inner end of the drive shaft is in a neutral state; Figure 4 for Figure 3 A-direction view (only the CG outer ring is shown, and the steel ball is a dotted line); Figure 5 It is a front view cross-sectional view of the existing handle type fork groove type constant velocity universal joint drive shaft when the shaft rod is moved to the left (the protrusion formed by the deformation of the raceway edge by the pressure pit prevents the steel ball from escaping); Figure 6 for Figure 5 B-direction view (only the CG outer ring is shown, and the steel ball is a dotted line); Figure 7 It is a front cross-sectional view when the inner end of the drive shaft of the present invention is in a neutral position; Figure 8 for Figure 7 C-direction view (only the CG outer ring is shown, and the steel ball is a dotted line); Fig. 9 It is a front cross-sectional view of the present invention when the drive shaft shaft rod is moved to the left (the convex ridge blocks the steel ball from escaping); Fig.10 for Fig. 9 D-direction view (only the CG outer ring is shown, and the steel ball is a dotted line); Fig.11 It is a front cross-sectional view of the CG outer ring in the present invention; Fig.12 for Fig.11 KK cross-sectional view. DETAILED DESCRIPTION

[0011] The present invention is further described below in conjunction with specific embodiments.

[0012] like Figures 7 to 12As shown, this embodiment includes a CG outer ring 1, a retainer 2, a CG inner ring 3, and n circumferentially uniformly distributed steel balls 4 placed in the window of the retainer 2. The number n of the steel balls 4 is 4 or 5 or 6 or 7 or 8 or 9 or 10. A ridge is provided on the vertical section of the entire raceway generatrix near the side edge of the shaft of the inner raceway of the CG outer ring 1, or a ridge 5 is provided on the vertical section of the entire raceway generatrix near the side edge of the shaft of the outer raceway of the CG inner ring 3. The ridge 5 is a circular arc, and the ridge 5 and the inner raceway of the CG outer ring 1 or the outer raceway of the CG inner ring 3 are composed of a transition arc A 51 and a transition arc B 52. Preferably, the radius R1 of transition arc A 51 is 10-14 mm, the radius R2 of the arc is 3-15 mm, and the radius R3 of transition arc B 52 is 10-14 mm; the arcs are tangent to transition arc A 51 and transition arc B 52 respectively; and the protrusion height of the arcs is 0.04-0.12 mm higher than the protrusion height of transition arc A 51 and transition arc B 52. Preferably, the adjacent inner raceways or adjacent outer raceways of the fork groove type constant velocity universal joint are inclined in opposite directions and have the same slope; or one of the adjacent inner raceways or adjacent outer raceways is not inclined and the other is inclined at a positive angle; or one of the adjacent inner raceways or adjacent outer raceways is not inclined and the other is inclined at a negative angle; the adjacent inner raceways or adjacent outer raceways are inclined in opposite directions and have different slopes.

[0013] The present invention is mainly used for disc type fork groove type constant velocity universal joints, and can also be used for handle type fork groove type constant velocity universal joints. The end with convex ridges is connected with the shaft rod end of the driving shaft, replacing the sealing sleeve cover to control the steel ball from falling out, and the other end has no convex ridges and is connected with the output flange of the driving and transmission end, and the steel ball is controlled to not fall out by the interference between the output flange and the steel ball.

[0014] The above-described embodiments are only preferred and exemplary and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-dropout fork groove type constant velocity universal joint, comprising a CG outer ring (1), a retainer (2), a CG inner ring (3), and n circumferentially uniformly distributed steel balls (4) disposed in a window of the retainer (2); characterized in that: A ridge (5) is provided on the inner raceway of the CG outer ring (1) near the side edge of the shaft rod along a vertical section of the entire raceway generatrix; the ridge (5) is an arc, and the ridge (5) and the inner raceway of the CG outer ring (1) are connected by a transition arc A (51) and a transition arc B (52).

2. The anti-dropout fork groove type constant velocity universal joint according to claim 1, characterized in that: The radius R1 of the transition arc A (51) is 10-14 mm, the radius R2 of the arc is 3-15 mm, and the radius R3 of the transition arc B (52) is 10-14 mm; the arcs are tangent to the transition arc A (51) and the transition arc B (52) respectively; and the protrusion height of the arcs is 0.04-0.12 mm higher than the protrusion height of the transition arc A (51) and the transition arc B (52).

3. The anti-dropout fork groove type constant velocity universal joint according to claim 1 or 2, characterized in that: The adjacent inner raceways or the adjacent outer raceways of the fork groove type constant velocity universal joint have opposite inclination directions and the same slope; or one of the adjacent inner raceways or the adjacent outer raceways is not inclined and the other is inclined at a positive angle; or one of the adjacent inner raceways or the adjacent outer raceways is not inclined and the other is inclined at a negative angle; the adjacent inner raceways or the adjacent outer raceways have opposite inclination directions and different slopes.

4. The anti-dropout fork groove type constant velocity universal joint according to claim 3, characterized in that: The number n of the steel balls 4 is 4 or 5 or 6 or 7 or 8 or 9 or 10.

5. The anti-dropout fork groove type constant velocity universal joint according to claim 1 or 2, characterized in that: The number n of the steel balls 4 is 4 or 5 or 6 or 7 or 8 or 9 or 10.

Images