Tripod universal joint
By designing a detachable bent elastic retaining ring and elliptical shaft in the three-ball pin universal joint, the problems of high maintenance costs and difficulty in disassembly are solved, and lower cost maintenance and larger swing angles are achieved.
Patent Information
- Application Number
- CN202420984863.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-05-08
AI Technical Summary
The existing three-ball pin universal joint needs to be replaced when damaged, resulting in high maintenance costs and the special shape of the elastic retaining ring makes it difficult to disassemble during the maintenance process.
A universal joint including a cylindrical shell and a three-ball pin is designed. The inner wall of the cylindrical shell is evenly arranged, and a partition is formed between the raceways. A detachable metal strip bent and formed elastic retaining ring is arranged, which is elastic. Both ends of the retaining ring are bent to form a hook shape for easy disassembly, and the cross-section of the shaft is oval to increase the swing angle.
It realizes that when the three-ball pin is damaged, it only needs to remove the elastic retaining ring and replace it, which reduces the maintenance cost and increases the swing angle through the elliptical shaft, which improves the flexibility of the universal joint and the convenience of maintenance.
Smart Images
Figure CN222141830U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of machinery and relates to a universal joint, in particular to a tripod-type 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 tripod-type universal joints. The tripod-type universal joint includes a housing and a tripod disposed in the housing, and a raceway that matches the tripod is provided in the housing. In order to prevent the tripod from falling out of the housing during use, a Chinese patent discloses an anti-falling structure of a drive shaft sliding joint assembly with an application number of 201720145109.3, which includes a real shaft, a dust cover assembly, a tripod assembly and a tripod fork. The end of the real shaft is equipped with a tripod assembly, the tripod assembly is inserted in the tripod fork, and the dust cover assembly is sleeved on the real shaft. A limiting boss is provided on the outer ring raceway of the bearing in the tripod fork near the end face of the tripod fork to limit the outward sliding of the bearing. However, in practice, the limit bosses are directly formed integrally on the tripod fork by riveting. If the tripod assembly is damaged and needs to be replaced, the entire universal joint has to be replaced, so the maintenance cost is relatively high.
[0003] Of course, some people have thought of using a circlip to block the tripod to prevent it from falling out, as disclosed in the tripod housing, drive shaft universal joint, and vehicle in patent application No. 202321182858.5. However, because the shape of the housing is relatively special, the shape of the circlip is also relatively special, making it difficult to disassemble it during actual maintenance. Utility Model Content
[0004] The utility model aims to solve the above problems in the prior art and proposes a tripod universal joint to solve the problem of high maintenance cost.
[0005] A tripod universal joint comprises a cylindrical shell and a tripod arranged in the cylindrical shell, wherein the inner wall of the cylindrical shell is evenly provided with three raceways along the circumferential direction, the cylindrical shell forms a partition between two adjacent raceways, and each end of the tripod is located in each raceway, and is characterized in that a clamping groove is provided on the inner side of each partition, and each clamping groove is flush with each other, and an elastic retaining ring formed by bending a metal strip and having an opening is provided in the mouth of the cylindrical shell, the elastic retaining ring is clamped in each clamping groove and partially located in each raceway at the same time, and both ends of the elastic retaining ring are located in one of the clamping grooves, and both ends of the elastic retaining ring have a bending section formed by bending toward the notch of the clamping groove, and the bending section makes the end of the elastic retaining ring hook-shaped.
[0006] During processing, slots are processed in the three partitions near the mouth of the cylindrical shell, and then a metal strip is bent to form an elastic retaining ring with an opening, and then the elastic retaining ring is installed and fixed at the mouth of the cylindrical shell through the slots. The elastic retaining ring is located in the three raceways to form a block for the tripod pin. Because the elastic retaining ring is detachable, when the tripod pin is damaged, the staff only needs to remove the elastic retaining ring to replace the tripod pin, and there is no need to replace the cylindrical shell together, thereby reducing the maintenance cost. At the same time, since the two ends of the elastic retaining ring have bent sections bent toward the notch direction of the slot where they are located, and the two bent sections make the two ends of the elastic retaining ring respectively hook-shaped, when the elastic retaining ring needs to be removed, the staff only needs to hold the circlip pliers with bent tips at the ends, insert the two bent tips of the circlip pliers into the slot where the two ends of the elastic retaining ring are located and hook them on the inner sides of the two ends of the elastic retaining ring, and finally pry the circlip pliers toward the notch direction of the slot to directly hook the two ends of the elastic retaining ring out of the slot, so that the entire elastic retaining ring can be easily removed from the cylindrical shell.
[0007] In the above-mentioned tripod universal joint, the two ends of the elastic retaining ring have straight sections, the two bent sections are respectively connected to the ends of the two straight sections, and an acute angle is formed between the bent section and the corresponding straight section.
[0008] Through the above arrangement, the hook shapes formed by the two ends of the elastic retaining ring can be more easily matched with the pointed heads of the circlip pliers.
[0009] In the above-mentioned tripod-type universal joint, the elastic retaining ring further comprises an arc transition section 1, an arc transition section 2, an arc transition section 3 and two clamping sections, the arc transition section 1, the arc transition section 2 and the arc transition section 3 are all arranged concentrically with the cylindrical shell and the arc lengths of the three are equal, the arc transition section 1, the arc transition section 2 and the arc transition section 3 are respectively located in three raceways, the clamping sections are straight, one of the clamping sections is clamped in a clamping groove of the partition between the arc transition section 1 and the arc transition section 2 and the two ends of the clamping section extend out of the partition where they are located. The two straight sections are located in the slots of the partition between the arc transition section one and the arc transition section three, one of the straight sections is connected to the other end of the arc transition section one, and the other straight section is connected to the other end of the arc transition section three.
[0010] During assembly, the two clamping sections are clamped in two of the clamping grooves, and then the positions where the two ends of the circlip are located are clamped in the last clamping groove. After assembly is completed, the arc transition section 1, the arc transition section 2 and the arc transition section 3 of the circlip are respectively located in the three raceways, so that the circlip can block the three ends of the tripod pin, so that it cannot fall out of the raceway.
[0011] In the above-mentioned tripod universal joint, the tripod includes a tripod frame and three roller assemblies, the tripod frame has three shaft portions in the radial direction, the three roller assemblies are respectively sleeved on the three shaft portions, the roller assembly includes an outer ring, an inner ring and a needle roller arranged between the outer ring and the inner ring, and the cross-section of the shaft portion is elliptical so that there is a swing gap between the outer wall of the shaft portion and the inner wall of the inner ring along the center line direction of the cylindrical shell.
[0012] Conventionally, the shaft of the tripod and the roller assembly are both cylindrically matched so that the two do not have a relative swing angle. The tripod universal joint has an elliptical cross section of the shaft and a swing gap between the outer wall of the shaft and the inner wall of the inner ring along the center line of the cylindrical shell. The swing gap allows the tripod and the roller assembly to swing at a certain angle, thereby increasing the overall swing angle.
[0013] In the above-mentioned tripod universal joint, the closed end of the cylindrical shell is integrally connected with a handle, the end of the handle away from the cylindrical shell has an external spline, and the middle outer side of the handle is provided with a plurality of spiral oil grooves.
[0014] The setting of the spiral oil groove can store oil and ensure the smoothness of the movement.
[0015] Compared with the prior art, the tripod-type universal joint blocks the tripod by setting an elastic retaining ring, and because the elastic retaining ring is detachable, when the tripod is damaged, the staff only needs to remove the elastic retaining ring to replace the tripod, and does not need to replace the cylindrical shell together, thereby reducing the maintenance cost. At the same time, by setting bending sections at both ends of the elastic retaining ring that are bent toward the notch direction of the slot, the two bending sections make the two ends of the elastic retaining ring respectively hook-shaped, and such a shape can be well matched with the circlip pliers with bent tip ends, so that the staff can easily remove the elastic retaining ring with the help of the circlip pliers with bent tip ends. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a plan view of the port of the tripod universal joint.
[0017] Figure 2 yes Figure 1 Sectional view along AA direction.
[0018] Figure 3 It is a plan view of the elastic retaining ring.
[0019] Figure 4 It is a plan view of the tripod in the tripod.
[0020] Figure 5 yes Figure 4 Cross-sectional view along the BB axis.
[0021] In the figure, 1, cylindrical shell; 1a, raceway; 1b, partition; 1b1, slot; 1c, handle; 1c1, spiral oil groove; 2, tripod; 2a, tripod bracket; 2a1, shaft; 2b, roller assembly; 2b1, outer ring; 2b2, inner ring; 2b3, needle roller; 2c, swing gap; 3, elastic retaining ring; 3a, bending section; 3b, straight section; 3c, arc transition section one; 3d, arc transition section two; 3e, arc transition section three; 3f, snap-fit section. DETAILED DESCRIPTION
[0022] 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.
[0023] like Figure 1 and Figure 2 As shown, the tripod universal joint comprises a cylindrical shell 1 and a tripod 2 arranged in the cylindrical shell 1. The inner wall of the cylindrical shell 1 is evenly provided with three raceways 1a along the circumferential direction. The cylindrical shell 1 forms a partition 1b between two adjacent raceways 1a. Since the number of raceways 1a is three, the number of partitions 1b is also three. The ends of the tripod 2 are respectively located in each raceway 1a. The cylindrical shell 1 is cylindrical and has a closed end. The closed end of the cylindrical shell 1 is integrally connected with a shank 1c. The end of the shank 1c away from the cylindrical shell 1 has an external spline. The middle outer side of the shank 1c is provided with a plurality of spiral oil grooves 1c1.
[0024] Furthermore, if Figure 1-Figure 3As shown, each partition 1b is provided with a slot 1b1 on the inner side, and each slot 1b1 is flush with each other. An elastic retaining ring 3 formed by bending a metal strip and having an opening is provided in the mouth of the cylindrical shell 1. The elastic retaining ring 3 is simultaneously stuck in each slot 1b1 and partially located in each raceway 1a. Both ends of the elastic retaining ring 3 are located in one of the slots 1b1. Both ends of the elastic retaining ring 3 have a bent section 3a formed by bending toward the notch direction of the slot 1b1. The two bent sections 3a respectively make the two ends of the elastic retaining ring 3 hook-shaped. Among them, both ends of the elastic retaining ring 3 have a straight bar section 3b, and the two bent sections 3a are respectively connected to the ends of the two straight bar sections 3b, and an acute angle is formed between the bent section 3a and the corresponding straight bar section 3b. In this embodiment, the elastic retaining ring 3 also has an arc transition section 1 3c, an arc transition section 2 3d, an arc transition section 3e and two clamping sections 3f. The arc transition section 1 3c, the arc transition section 2 3d and the arc transition section 3e are all concentrically arranged with the cylindrical shell 1 and the arc lengths of the three are equal. The arc transition section 1 3c, the arc transition section 2 3d and the arc transition section 3e are respectively located in the three raceways 1a. The clamping section 3f is straight, and one of the clamping sections 3f is clamped in the clamping groove 1b1 of the partition 1b between the arc transition section 1 3c and the arc transition section 2 3d, and the two ends of the clamping section 3f extend out of the two sides of the partition 1b where they are located and It is connected to one end of the arc transition section 1 3c and the arc transition section 2 3d, the other clamping section 3f is clamped in the clamping groove 1b1 of the partition 1b between the arc transition section 2 3d and the arc transition section 3e, and the two ends of the clamping section 3f extend out of the two sides of the partition 1b and are connected to the other end of the arc transition section 2 3d and one end of the arc transition section 3e, the two straight sections 3b are located in the clamping groove 1b1 of the partition 1b between the arc transition section 1 3c and the arc transition section 3 3e, one of the straight sections 3b is connected to the other end of the arc transition section 1 3c, and the other straight section 3b is connected to the other end of the arc transition section 3e.
[0025] During processing, the three partitions 1b are respectively processed into slots 1b1 near the mouth of the cylindrical shell 1, and then a metal strip is bent to form an elastic circlip 3 with an opening, and then the elastic circlip 3 is installed and fixed at the mouth of the cylindrical shell 1 through each slot 1b1. Specifically, the two clamping sections 3f of the elastic circlip 3 are located in two of the slots 1b1, and the positions of the two ends of the elastic circlip 3 are located in the remaining slot 1b1, which means that the opening of the elastic circlip 3 is hidden in the slot 1b1 and is not easy to be maliciously removed by others without tools. After the elastic circlip 3 is assembled, the arc transition section 1 3c, the arc transition section 2 3d and the arc transition section 3 3e of the elastic circlip 3 are respectively located in the three raceways 1a, and the shape of the elastic circlip 3 located in the three raceways 1a can just block the three ends of the tripod pin 2, so that the tripod pin 2 cannot escape from the raceway 1a. Because the circlip 3 is detachable, when the tripod 2 is damaged, the staff only needs to remove the circlip 3 to replace the tripod 2, and there is no need to replace the cylindrical shell 1 together.
[0026] Since the two ends of the elastic circlip 3 have bent sections 3a bent toward the notch direction of the slot 1b1, and the two bent sections 3a make the two ends of the elastic circlip 3 hook-shaped, when the elastic circlip 3 needs to be removed, the staff only needs to hold the circlip pliers with bent tips at the ends, insert the two bent tips of the circlip pliers into the slot 1b1 where the two ends of the elastic circlip 3 are located and hook them on the inner sides of the two ends of the elastic circlip 3, and finally pry the circlip pliers toward the notch direction of the slot 1b1 to directly hook the two ends of the elastic circlip 3 out of the slot 1b1, so that the entire elastic circlip 3 can be easily removed from the cylindrical shell 1.
[0027] Furthermore, if Figure 2 , Figure 4 and Figure 5 As shown, the tripod pin 2 includes a tripod frame 2a and three roller assemblies 2b. The tripod frame 2a has three shaft portions 2a1 in the radial direction. The three roller assemblies 2b are respectively sleeved on the three shaft portions 2a1. The roller assembly 2b includes an outer ring 2b1, an inner ring 2b2, and a needle roller 2b3 arranged between the outer ring 2b1 and the inner ring 2b2. The cross section of the shaft portion 2a1 is elliptical so that there is a swing gap 2c between the outer wall of the shaft portion 2a1 and the inner wall of the inner ring 2b2 along the center line direction of the cylindrical shell 1. By setting the cross section of the shaft portion 2a1 to be elliptical and providing a swing gap 2c between the outer wall of the shaft portion 2a1 and the inner wall of the inner ring 2b2 along the center line direction of the cylindrical shell 1, the tripod frame 2a and the roller assembly 2b can also swing at a certain angle through the swing gap 2c, so that the entire swing angle becomes larger.
[0028] 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 tripod universal joint, comprising a cylindrical shell (1) and a tripod (2) arranged in the cylindrical shell (1), wherein the inner wall of the cylindrical shell (1) is evenly provided with three raceways (1a) along the circumferential direction, the cylindrical shell (1) forms a partition (1b) between two adjacent raceways (1a), and each end of the tripod (2) is located in each raceway (1a), characterized in that: Each partition (1b) is provided with a slot (1b1) on the inner side, and each slot (1b1) is flush with each other. An elastic retaining ring (3) formed by bending a metal strip and having an opening is provided in the mouth of the cylindrical shell (1). The elastic retaining ring (3) is simultaneously clamped in each slot (1b1) and partially located in each raceway (1a). Both ends of the elastic retaining ring (3) are located in one of the slots (1b1). Both ends of the elastic retaining ring (3) have a bent section (3a) formed by bending toward the notch direction of the slot (1b1), and the bent section (3a) makes the end of the elastic retaining ring (3) hook-shaped.
2. The tripod universal joint according to claim 1, characterized in that: The two ends of the elastic retaining ring (3) are provided with straight sections (3b), the two bent sections (3a) are respectively connected to the ends of the two straight sections (3b), and an acute angle is formed between the bent section (3a) and the corresponding straight section (3b).
3. The tripod universal joint according to claim 2, characterized in that: The elastic retaining ring (3) further comprises an arc transition section 1 (3c), an arc transition section 2 (3d), an arc transition section 3 (3e) and two clamping sections (3f); the arc transition section 1 (3c), the arc transition section 2 (3d) and the arc transition section 3 (3e) are all arranged concentrically with the cylindrical shell (1) and have the same arc length; the arc transition section 1 (3c), the arc transition section 2 (3d) and the arc transition section 3 (3e) are respectively located in three raceways (1a); the clamping sections (3f) are straight; one of the clamping sections (3f) is clamped in a clamping groove (1b1) of a partition (1b) between the arc transition section 1 (3c) and the arc transition section 2 (3d); and the two ends of the clamping section (3f) extend out of the two sides of the partition (1b) and are connected to the clamping groove (1b1) of the partition (1b) between the arc transition section 1 (3c) and the arc transition section 2 (3d). The arc transition section 1 (3c) is connected to one end of the arc transition section 2 (3d); another clamping section (3f) is clamped in a clamping groove (1b1) of a partition (1b) between the arc transition section 2 (3d) and the arc transition section 3 (3e); two ends of the clamping section (3f) extend out of two sides of the partition (1b) and are connected to the other end of the arc transition section 2 (3d) and one end of the arc transition section 3 (3e); two straight sections (3b) are located in the clamping groove (1b1) of the partition (1b) between the arc transition section 1 (3c) and the arc transition section 3 (3e); one of the straight sections (3b) is connected to the other end of the arc transition section 1 (3c), and the other straight section (3b) is connected to the other end of the arc transition section 3 (3e).
4. The tripod universal joint according to claim 1, 2 or 3, characterized in that: The tripod pin (2) comprises a tripod frame (2a) and three roller assemblies (2b); the tripod frame (2a) has three shaft portions (2a1) in the radial direction; the three roller assemblies (2b) are respectively sleeved on the three shaft portions (2a1); the roller assembly (2b) comprises an outer ring (2b1), an inner ring (2b2) and a needle roller (2b3) arranged between the outer ring (2b1) and the inner ring (2b2); the cross section of the shaft portion (2a1) is elliptical so that a swing gap (2c) is provided between the outer wall of the shaft portion (2a1) and the inner wall of the inner ring (2b2) along the center line direction of the cylindrical shell (1).
5. The tripod universal joint according to claim 1, 2 or 3, characterized in that: The closed end of the cylindrical shell (1) is integrally connected with a handle (1c), the end of the handle (1c) away from the cylindrical shell (1) has an external spline, and the middle outer side of the handle (1c) is provided with a plurality of spiral oil grooves (1c1).