Constant velocity joint

Abstract

The utility model provides a constant velocity universal joint, and belongs to the technical field of machinery. The problem that the rear cover is not firmly connected is solved. The three-ball-pin connector comprises a straight-through type shell and a three-ball-pin assembly arranged in the shell, a flange connecting part is arranged at the rear end of the shell, a plurality of mounting holes are formed in the flange connecting part in the center line direction of the shell, a rear cover is connected to the rear end of the shell, and a plurality of first notches are formed in the outer edge of the flange connecting part; the rear cover is provided with a cover-shaped part and a flange butt joint part integrally and fixedly connected to the outer edge of the opening part of the cover-shaped part, the flange butt joint part is in a plate shape and abuts against the flange connecting part, a plurality of second notches are formed in the outer edge of the flange butt joint part, and the first notches are aligned with the second notches; the flange butt joint part is provided with a plurality of through holes, the through holes are aligned with the mounting holes, positioning pieces are integrally and fixedly connected to the bottom walls of part or all of the second notches, and the positioning pieces penetrate through the corresponding first notches and are buckled to the front end face of the flange connecting part. The rear cover is firmer in connection and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a constant velocity universal joint. Background Art

[0002] A universal joint is a component that realizes angular power transmission and is used in positions where the direction of the transmission axis needs to be changed. It is a joint component of the universal transmission device of the automobile drive system. There are many types of universal joints, including three-ball pin type constant velocity universal joints. For example, a universal joint improvement structure disclosed in patent application No. 201010299048.9 includes a bell-shaped shell with a three-pin assembly outer cover, a rear cover is provided at the rear end of the bell-shaped shell, and a mutually matching elastic snap-fitting structure is provided between the rear cover and the bell-shaped shell so that the rear cover and the bell-shaped shell are elastically snap-fitted together; wherein the elastic snap-fitting structure includes a hook at the front end of the rear cover, a slot is provided on the rear end surface of the bell-shaped shell, a flange for snapping the front end of the hook is provided in the slot, a chamfer is provided on the inner side of the slot, and a bending structure is provided at the rear end of the hook, and the bending structure is abutted against the chamfered surface of the inner side of the slot and the end surface of the bell-shaped shell. When using and assembling, the bell-shaped shell is connected to the end reduction gear by screws to complete the connection and assembly of the universal joint. During operation, the rotating shaft and torque from the engine are transmitted to the tripod through the bell housing, and the tripod is transmitted to the wheel through the shaft rod and the fixed constant velocity universal joint.

[0003] However, the improved structure of the universal joint also has its shortcomings: in practice, the flanges in the slots are formed by riveting at the notches, and the thickness thereof is relatively weak. During use, the flanges may easily flip open, causing the connection between the rear cover and the bell housing to become loose or even fall off. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes a constant velocity universal joint to solve the problem that the rear cover is not firmly connected.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A constant velocity universal joint comprises a straight-through shell and a tripod assembly arranged in the shell, wherein the rear end of the shell has a flange connection portion, and the flange connection portion is provided with a plurality of mounting holes along the center line direction of the shell, and each mounting hole is evenly distributed around the center line of the shell, and a rear cover is connected to the rear end of the shell, characterized in that the outer edge of the flange connection portion has a plurality of first recesses distributed along the circumferential direction, the rear cover has a cover-like portion and a flange docking portion integrally connected to the outer edge of the mouth of the cover-like portion, the flange docking portion is plate-shaped, the flange docking portion abuts against the flange connection portion, the outer edge of the flange docking portion has a plurality of second recesses distributed along the circumferential direction, each first recess is aligned with each second recess, the flange docking portion is provided with a plurality of through holes, and each through hole is aligned with each mounting hole, and a positioning sheet is integrally connected to the bottom wall of some or all of the second recesses, and the positioning sheet passes through the corresponding first recess and is buckled on the front end surface of the flange connection portion.

[0007] When the rear cover is just processed, the positioning piece is straight and arranged along the radial direction of the flange docking part. During installation, the flange docking part of the rear cover is abutted against the flange connection part of the housing in a manner that the second notch is aligned with the first notch, and then each positioning piece is folded, the positioning piece is first folded into the first notch and then the end of the positioning piece is folded, and the positioning piece after the complete folding is in a state of passing through the first notch and then buckled on the front end surface of the flange connection part. In this way, the rear cover is connected to the rear end of the housing to ensure that the rear cover will not fall off the housing during transportation. Then, since the through holes on the flange docking part are aligned with the mounting holes on the flange connection part, when the housing and the terminal reduction gear are fixed by the screws passing through the mounting holes, the screws will also pass through the through holes on the flange docking part, so that the screws can fix the housing and the terminal reduction gear while the screws can also play the role of fixing the rear cover and the housing. Through the above arrangement, the connection firmness between the rear cover and the housing is well improved.

[0008] In the above constant velocity universal joint, the bottom wall of the first recess matched with the positioning piece is a plane.

[0009] The bottom wall of the first recess matched with the positioning plate is set to be a plane, so that the part of the positioning plate passing through the first recess will have more contact with the bottom wall of the first recess, making the positioning plate and the flange connection part fit more closely, thereby improving the connection firmness between the back cover and the shell.

[0010] In the above-mentioned constant velocity universal joint, the front end surface of the flange connection portion is provided with a slot, and the end of the positioning piece has an inserting portion inserted into the slot.

[0011] The insertion of the plug-in portion and the slot makes it less likely for the rear cover to fall off the housing during transportation.

[0012] In the above constant velocity universal joint, the inner side of the rear cover has a convex rib protruding into the cover-shaped portion at the transition between the cover-shaped portion and the flange joint portion, and the outer side of the rear cover has a pit corresponding to the position of the convex rib.

[0013] The ribs can play a role in strengthening the structure and make the back cover stronger, so as to ensure that it is not easily deformed during transportation or use. In practice, the ribs can be formed by extrusion from the outside to the inside, and after the ribs are formed, the outer side of the back cover will naturally have pits.

[0014] In the above constant velocity universal joint, the number of the convex ribs is several, and the convex ribs are distributed along the circumferential direction.

[0015] In the above constant velocity universal joint, the rear cover is a stainless steel stamping part.

[0016] During manufacturing, a stainless steel plate is extruded from the middle to the back, the extruded part is the cover-shaped part, and the remaining part is the flange docking part which is integrally fixed to the outer edge of the mouth of the cover-shaped part.

[0017] In the above constant velocity universal joint, the rear end face of the housing is provided with an annular sealing groove, a sealing ring is arranged in the annular sealing groove, and the sealing ring abuts against the front side face of the flange joint portion to form a seal.

[0018] An annular sealing groove is arranged on the rear end face of the housing and a sealing ring is arranged in the annular sealing groove, and the sealing ring abuts against the front side of the plate-shaped flange joint to form a seal, which can prevent oil leakage between the rear cover and the housing. In addition, the head of the screw used to install and fix the housing will press on the rear side of the flange joint, which ensures that the front side of the flange joint can be firmly attached to the sealing ring.

[0019] Compared with the prior art, the constant velocity universal joint of the present invention provides a plurality of circumferentially distributed first recesses on the outer edge of the flange connection portion, and the rear cover is provided with a flange docking portion which includes a cover-like portion and an outer edge of a mouth portion integrally fixed to the cover-like portion, the outer edge of the flange docking portion has a plurality of circumferentially distributed second recesses, the flange docking portion is provided with a plurality of through holes and each through hole is aligned with each mounting hole, and a positioning sheet is integrally fixed to the bottom wall of some or all of the second recesses, and the positioning sheet passes through the corresponding first recess and is buckled on the front end surface of the flange connection portion so that the rear cover can be connected to the housing during transportation, and then when the housing and the terminal reduction gear are fixed by means of screws passing through the mounting holes, the screws can also simultaneously pass through the through holes on the flange docking portion to fix the rear cover to the housing, thereby greatly improving the connection firmness between the rear cover and the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a rear view of this constant velocity universal joint.

[0021] Figure 2 yes Figure 1 Sectional view along AA direction.

[0022] Figure 3 This is a rear view of the constant velocity joint without the rear cover attached.

[0023] Figure 4 It is the rear view of the rear cover.

[0024] Figure 5 yes Figure 4 Cross-sectional view along the BB axis.

[0025] In the figure, 1, shell; 1a, flange connection part; 1a1, mounting hole; 1a2, first recess; 1a21, plane; 1a3, slot; 1b, annular sealing groove; 2, tripod assembly; 3, rear cover; 3a, cover-shaped part; 3b, flange docking part; 3b1, second recess; 3b2, through hole; 3b3, positioning sheet; 3b31, plug-in part; 3c, rib; 3d, pit; 4, sealing ring. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figure 1-Figure 3 As shown, the constant velocity universal joint comprises a straight-through housing 1 and a tripod assembly 2 arranged in the housing 1. The rear end of the housing 1 has a flange connection portion 1a, and the flange connection portion 1a is provided with a plurality of mounting holes 1a1 along the center of the housing 1, and each mounting hole 1a1 is evenly distributed around the center line of the housing 1, and the outer edge of the flange connection portion 1a has a plurality of first notches 1a2, and each first notch 1a2 is evenly distributed along the circumferential direction. The rear end of the housing 1 is connected to a rear cover 3.

[0028] like Figure 2-Figure 5As shown, the rear cover 3 has a cover-shaped portion 3a and a flange docking portion 3b integrally connected to the outer edge of the mouth of the cover-shaped portion 3a. The flange docking portion 3b is plate-shaped, and the flange docking portion 3b abuts against the flange connection portion 1a. The outer edge of the flange docking portion 3b has a plurality of second recesses 3b1 distributed along the circumferential direction, and each first recess 1a2 is aligned with each second recess 3b1. The flange docking portion 3b is also provided with a plurality of through holes 3b2 along the center line direction of the housing 1, and each through hole 3b2 is aligned with each mounting hole 1a1. The bottom wall of some or all of the second recesses 3b1 is integrally connected with a positioning piece 3b3, and the positioning piece 3b3 is L-shaped, and the positioning piece 3b3 passes through the corresponding first recess 1a2 and is buckled on the front end surface of the flange connection portion 1a. In this embodiment, the number of the second recesses 3b1 fixed with the positioning piece 3b3 is the same as the number of the second recesses 3b1 not fixed with the positioning piece 3b3, and the second recesses 3b1 fixed with the positioning piece 3b3 and the second recesses 3b1 not fixed with the positioning piece 3b3 are arranged at intervals along the circumferential direction. The bottom wall of the first recess 1a2 matched with the positioning piece 3b3 is a plane 1a21. The rear end face of the housing 1 is provided with an annular sealing groove 1b, and a sealing ring 4 is provided in the annular sealing groove 1b, and the sealing ring 4 abuts against the front side of the flange docking part 3b to form a seal. The front end face of the flange connection part 1a is provided with a slot 1a3, and the end of the positioning piece 3b3 has a plug-in part 3b31 inserted into the slot 1a3.

[0029] Furthermore, if Figure 4 and Figure 5 As shown, the inner side of the rear cover 3 has a convex rib 3c protruding toward the inner side of the cover 3a at the transition between the cover 3a and the flange docking portion 3b, and the outer side of the rear cover 3 has a concave pit 3d at the position corresponding to the convex rib 3c. The provision of the convex rib 3c can play a role in structural reinforcement, making the strength of the rear cover 3 better, so as to ensure that it is not easy to deform during transportation or use. In practice, the rear cover 3 is a stainless steel stamping part. During manufacturing, a stainless steel plate is extruded from the middle to the back. The extruded part is the cover 3a, and the remaining part is the flange docking portion 3b integrally connected to the outer edge of the mouth of the cover 3a. At the same time, the convex rib 3c can be formed by extrusion from the outside to the inside, and after the convex rib 3c is formed, the outer side of the rear cover 3 will naturally have a concave pit 3d. The number of convex ribs 3c is several, and each convex rib 3c is distributed along the circumferential direction.

[0030] When the rear cover 3 is just processed, the positioning piece 3b3 is straight and arranged along the radial direction of the flange docking portion 3b. During installation, the flange docking portion 3b of the rear cover 3 is abutted against the flange connection portion 1a of the housing 1 in such a way that the second notch 3b1 is aligned with the first notch 1a2, and then each positioning piece 3b3 is folded, the positioning piece 3b3 is first folded into the first notch 1a2 and then the end of the positioning piece 3b3 is folded, and the positioning piece 3b3 after being completely folded is in a state of passing through the first notch 1a2 and then buckled on the front end surface of the flange connection portion 1a, and the end of the positioning piece 3b3 is folded to become the plug-in portion 3b31 inserted into the slot 1a3. In this way, the rear cover 3 is connected to the rear end of the housing 1. Then, since the through holes 3b2 on the flange docking portion 3b are aligned with the mounting holes 1a1 on the flange connecting portion 1a, when the housing 1 and the terminal reduction gear are fixed by means of screws passing through the mounting holes 1a1, the screws will also pass through the through holes 3b2 on the flange docking portion 3b, so that the screws can fix the housing 1 and the terminal reduction gear while also fixing the rear cover 3 to the housing 1.

[0031] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A constant velocity universal joint, comprising a straight-through housing (1) and a tripod assembly (2) arranged in the housing (1), wherein the rear end of the housing (1) has a flange connection portion (1a), the flange connection portion (1a) is provided with a plurality of mounting holes (1a1) along the center line direction of the housing (1), the mounting holes (1a1) are evenly distributed around the center line of the housing (1), and the rear end of the housing (1) is connected to a rear cover (3). It is characterized in that The outer edge of the flange connection part (1a) has a plurality of first notches (1a2) distributed along the circumferential direction. The rear cover (3) has a cover-shaped part (3a) and a flange docking part (3b) integrally connected to the outer edge of the mouth of the cover-shaped part (3a). The flange docking part (3b) is plate-shaped and abuts against the flange connection part (1a). The outer edge of the flange docking part (3b) has a plurality of second notches (3b1) distributed along the circumferential direction. Each first notch (1a2) is aligned with each second notch (3b1). The flange docking part (3b) is provided with a plurality of through holes (3b2) and each through hole (3b2) is aligned with each mounting hole (1a1). The bottom wall of some or all of the second notches (3b1) is integrally connected with a positioning piece (3b3). The positioning piece (3b3) passes through the corresponding first notch (1a2) and is buckled on the front end surface of the flange connection part (1a).

2. The constant velocity joint according to claim 1, It is characterized in that The bottom wall of the first recess (1a2) matched with the positioning piece (3b3) is a plane (1a21).

3. The constant velocity universal joint according to claim 2, It is characterized in that The front end surface of the flange connection part (1a) is provided with a slot (1a3), and the end of the positioning piece (3b3) has an inserting part (3b31) inserted into the slot (1a3).

4. The constant velocity universal joint according to claim 1, 2 or 3, It is characterized in that The inner side of the rear cover (3) has a convex rib (3c) protruding toward the cover-shaped portion (3a) at the transition between the cover-shaped portion (3a) and the flange docking portion (3b), and the outer side of the rear cover (3) has a concave pit (3d) corresponding to the position of the convex rib (3c).

5. The constant velocity universal joint according to claim 4, It is characterized in that The number of the convex ribs (3c) is several, and the convex ribs (3c) are distributed along the circumferential direction.

6. The constant velocity universal joint according to claim 5, It is characterized in that The rear cover (3) is a stainless steel stamping part.

7. The constant velocity universal joint according to claim 1, It is characterized in that The rear end face of the housing (1) is provided with an annular sealing groove (1b), a sealing ring (4) is provided in the annular sealing groove (1b), and the sealing ring (4) abuts against the front side face of the flange docking portion (3b) to form a seal.

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