Constant velocity universal joint

Abstract

A constant velocity universal joint comprises a connecting shaft, the two ends of the connecting shaft are connected with one ends of ball supports respectively, the other ends of the ball supports are connected with cylindrical shells respectively, annular grooves are formed in the cylindrical shells respectively, grooves are formed in the ball supports respectively, the ball supports are inserted into the corresponding annular grooves respectively, and a plurality of through grooves are formed in the ball supports respectively. Steel balls are movably arranged in the through grooves respectively, and a first sliding groove and a second sliding groove which are in sliding contact fit with the steel balls are sequentially formed in the two sides of the steel balls respectively. The utility model has the advantages of simple structure and ingenious conception, cancels a retainer in the existing device, and when the cylindrical shell is mounted, one end of the ball head bracket with the steel ball is directly inserted into the annular groove without using the retainer, so that the assembly process is simpler; the ball head support is in arc surface contact with the inner check ring and the outer check ring, the constant velocity universal joint is small in operation resistance and high in transmission efficiency, the service life is prolonged, actual requirements can be met, and the constant velocity universal joint is suitable for popularization.

Description

Technical Field

[0001] This utility model belongs to the field of universal joints, specifically a constant velocity universal joint. Background Technology

[0002] With economic development and the expansion of user scale, industries such as oil fields, power, coal-water slurry, chemicals, and food require increasingly larger flow rates and higher pressures from screw pumps. Currently, the transmission structure of screw pumps mainly adopts a cross-shaft universal coupling. This type of coupling mainly consists of a central shaft and universal joints connecting the two ends of the central shaft. This type of coupling has advantages such as high transmission efficiency and large torque transmission. Patent CN202867605U, entitled "Ball Cage Constant Velocity Universal Coupling", discloses a coupling with a cage. Due to the use of a cage, the structure of this coupling is relatively complex, and the space is narrow during installation, making installation inconvenient. In addition, the friction between the push rod and the baffle is large during the rotation of this device, and the components are easily damaged. Therefore, we designed a constant velocity universal joint that is simpler to assemble and has less friction. Utility Model Content

[0003] This invention provides a constant velocity universal joint to address the deficiencies in the prior art.

[0004] This utility model is achieved through the following technical solution:

[0005] A constant velocity universal joint includes a connecting shaft, with one end of a ball joint bracket connected to each end of the connecting shaft. The other end of the ball joint bracket is connected to a cylindrical outer shell. Annular grooves are formed on the cylindrical outer shell, and grooves are formed on the ball joint bracket. The ball joint bracket is inserted into the corresponding annular groove. Several through slots are formed on the ball joint bracket, and steel balls are movably disposed within each through slot. A first sliding groove and a second sliding groove are sequentially formed on the sides of the steel balls, engaging in sliding contact with them. The first and second sliding grooves are formed on the sidewalls of the annular grooves and correspond one-to-one. Inner and outer retaining rings are sequentially formed on both sides of the ball joint bracket's ball head. The ball joint bracket engages in sliding contact with the corresponding inner and outer retaining rings. The contact surfaces between the inner and outer retaining rings and the ball joint bracket are arc surfaces. A limiting element restricting the movement of the outer retaining ring is provided on one side.

[0006] As described above, in a constant velocity universal joint, mounting grooves are respectively opened at both ends of the connecting shaft, one end of the ball head bracket is inserted into the corresponding mounting groove and connected by a cylindrical pin, and pin holes for insertion and mating with the cylindrical pin are respectively opened on the end of the connecting shaft and the corresponding end of the ball head bracket.

[0007] As described above, in a constant velocity universal joint, a dust cover is provided at one end of the cylindrical outer shell and the end of the connecting shaft. The dust cover is fitted over the ball joint bracket, and the two ends of the dust cover are fastened to the cylindrical outer shell and the connecting shaft in sequence by buckle steel straps.

[0008] As described above, in a constant velocity universal joint, the opposite end of the cylindrical outer shell is a closed end.

[0009] As described above, in a constant velocity universal joint, the limiting component is a perforated elastic retaining ring. One side of the outer retaining ring is abutted against and fitted with the perforated elastic retaining ring. An inner groove is formed on the inner wall of the annular groove, and the perforated elastic retaining ring is inserted into and fitted with the inner groove.

[0010] The advantages of this utility model are: It has a simple structure and ingenious design, eliminating the retainer found in existing devices. When installing the cylindrical outer shell, the end of the ball head bracket with the steel ball is directly inserted into the annular groove, eliminating the need for a retainer and simplifying the assembly process. The ball head bracket has an arc-shaped contact with the inner and outer retaining rings, resulting in low operating resistance, high transmission efficiency, and extended service life for the constant velocity universal joint, meeting practical needs and making it suitable for widespread application. When assembling this device, first place the inner retaining ring into the annular groove, then place the steel ball into the through groove on the ball head bracket, aligning the steel ball with the corresponding first sliding groove. Next, insert the ball head bracket into the annular groove on the corresponding cylindrical outer shell. Then, place the outer retaining ring around the ball head bracket and into the annular groove. Finally, use a limiting member to secure the ball head bracket, and finally connect the ball head bracket to the corresponding end of the connecting shaft. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the ball joint bracket connection; Figure 3 This is a diagram showing the rotation state of the ball joint support; Figure 4 yes Figure 2 A sectional view of the right view.

[0013] Reference numerals: 1. Cylindrical outer shell, 2. Inner retaining ring, 3. Steel ball, 4. Outer retaining ring, 5. Buckled steel strip, 6. Ball head bracket, 7. Dust cover, 8. Cylindrical pin, 9. Connecting shaft, 10. Elastic retaining ring for hole, 12. Annular groove, 13. Groove, 14. Through groove, 15. First sliding groove, 16. Second sliding groove, 20. Mounting groove, 22. Pin hole, 50. Inner groove. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0015] A type of constant velocity universal joint, such as Figure 1 , 2 As shown in Figures 3 and 4, the device includes a connecting shaft 9, with both ends of the connecting shaft 9 connected to one end of a ball joint bracket 6, and the other end of the ball joint bracket 6 connected to a cylindrical outer shell 1. The device is characterized by: annular grooves 12 formed on the cylindrical outer shell 1, and grooves 13 formed on the ball joint bracket 6, with the ball joint bracket 6 inserted into the corresponding annular grooves 12; connecting holes for connection with the shaft are formed at the end of the cylindrical outer shell 1 away from the ball joint bracket 6; several through slots 14 are formed on the ball joint bracket 6, with steel balls 3 movably disposed within each through slot 14; and sliding contact points are sequentially provided on both sides of each steel ball 3. The first sliding groove 15 and the second sliding groove 16 are in dynamic contact with each other. The first sliding groove 15 and the second sliding groove 16 are opened on the side wall of the annular groove 12 and correspond one to one. The inner wall of the first sliding groove 15 near the axis of the cylindrical shell 1 is arc-shaped. The ball head support 6 has an inner retaining ring 2 and an outer retaining ring 4 on both sides of the ball head. The ball head support 6 slides in contact with the corresponding inner retaining ring 2 and outer retaining ring 4. The contact surface between the inner retaining ring 2 and the outer retaining ring 4 and the ball head support 6 is an arc surface. The arc surface is concentric with the spherical part of the ball head support 6. A limiting member is provided on one side of the outer retaining ring 4 to restrict its movement. This utility model has a simple structure and ingenious design. It eliminates the retainer in existing devices. When installing the outer shell 1, the end of the ball head bracket 6 with the steel ball 3 is inserted directly into the annular groove 12, eliminating the need for a retainer and simplifying the assembly process. The ball head bracket 6 has an arc-shaped contact with the inner retaining ring 2 and the outer retaining ring 4, resulting in low operating resistance, high transmission efficiency, and extended service life for the constant velocity universal joint. This meets practical needs and is suitable for widespread application. To assemble this device, first place the inner retaining ring 2 into the annular groove 12, then place the steel ball 3 into the through groove 14 on the ball head bracket 6, aligning the steel ball 3 with the corresponding first sliding groove 15. Next, insert the ball head bracket 6 into the annular groove 12 on the corresponding cylindrical outer shell 1. Then, fit the outer retaining ring 4 around the ball head bracket 6 and place it into the annular groove 12. Finally, use a limiting member to restrain the ball head bracket 6, and finally connect the ball head bracket 6 to the corresponding end of the connecting shaft 9.

[0016] Specifically, as shown in the figure, in this embodiment, mounting grooves 20 are respectively opened at both ends of the connecting shaft 9. One end of the ball head bracket 6 is inserted into the corresponding mounting groove 20 and connected by a cylindrical pin 8. Pin holes 22 for insertion and mating with the cylindrical pin 8 are respectively opened on the ends of the connecting shaft 9 and the ball head bracket 6. After the ball head bracket 6 is inserted into the corresponding mounting groove 20 of the connecting shaft 9, the cylindrical pin 8 is inserted into the corresponding pin hole 22, thus completing the connection between the connecting shaft 9 and the ball head bracket 6. The connection of the cylindrical pin 8 allows the device to swing a wider range.

[0017] Specifically, as shown in the figure, in this embodiment, a dust cover 7 is provided at one end of the cylindrical outer shell 1 that is close to the connecting shaft 9. The dust cover 7 is fitted over the ball joint bracket 6, and both ends of the dust cover 7 are fastened to the cylindrical outer shell 1 and the connecting shaft 9 in sequence by buckle steel straps 5. The dust cover 7 isolates the ball joint bracket 6 from the outside world, forming a good seal and preventing foreign objects from entering the connection between the two ends of the ball joint bracket 6 and causing damage.

[0018] Furthermore, as shown in the figure, the opposite end of the cylindrical outer shell 1 in this embodiment is a closed end. The closed end of the cylindrical outer shell 1 prevents conveyed materials from entering the device and causing damage to the universal joint.

[0019] Furthermore, as shown in the figure, the limiting component in this embodiment is a hole-type elastic retaining ring 10. The hole-type elastic retaining ring 10 is abutted against one side of the outer retaining ring 4. The hole-type elastic retaining ring 10 is a readily available and mature technology, and will not be described in detail here. An inner groove 50 is formed on the inner wall of the annular groove 12, and the hole-type elastic retaining ring 10 is inserted into the inner groove 50. The ring can be installed or removed by inserting the jaws of the snap ring pliers into the jaw holes of the hole-type elastic retaining ring 10 and opening or clamping it.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A constant velocity universal joint, comprising a connecting shaft (9), both ends of which are respectively connected to one end of a ball joint bracket (6), and the other end of the ball joint bracket (6) is respectively connected to a cylindrical outer shell (1), characterized in that: Annular grooves (12) are opened on the cylindrical shell (1), and grooves (13) are opened on the ball head bracket (6). The ball head bracket (6) is inserted into the corresponding annular groove (12). Several through grooves (14) are opened on the ball head bracket (6). Steel balls (3) are movably arranged in the through grooves (14). The first sliding groove (15) and the second sliding groove (16) are arranged on both sides of the steel ball (3) in sequence to make sliding contact with it. The first sliding groove (15) and the second sliding groove (16) are opened on the side wall of the annular groove (12) and correspond one to one. The inner retaining ring (2) and the outer retaining ring (4) are arranged on both sides of the ball head of the ball head bracket (6). The ball head bracket (6) makes sliding contact with the corresponding inner retaining ring (2) and outer retaining ring (4). The contact surface between the inner retaining ring (2) and the outer retaining ring (4) and the ball head bracket (6) is an arc surface. A limiting member restricting its movement is provided on one side of the outer retaining ring (4).

2. A constant velocity universal joint according to claim 1, characterized in that: Mounting grooves (20) are respectively opened at both ends of the connecting shaft (9). One end of the ball head bracket (6) is inserted into the corresponding mounting groove (20) and connected by a cylindrical pin (8). Pin holes (22) for insertion and mating with the cylindrical pin (8) are respectively opened on the end of the connecting shaft (9) corresponding to the ball head bracket (6).

3. A constant velocity universal joint according to claim 1, characterized in that: The cylindrical shell (1) and the connecting shaft (9) are respectively provided with dust covers (7). The dust covers (7) are sleeved on the ball head bracket (6). The two ends of the dust covers (7) are fastened to the cylindrical shell (1) and the connecting shaft (9) in sequence by buckle steel straps (5).

4. A constant velocity universal joint according to claim 1, characterized in that: The opposite end of the cylindrical outer shell (1) is a closed end.

5. A constant velocity universal joint according to claim 1, characterized in that: The limiting member is a hole elastic retaining ring (10). The hole elastic retaining ring (10) is provided on one side of the outer retaining ring (4) in contact with the outer retaining ring (4). An inner groove (50) is opened on the inner wall of the annular groove (12). The hole elastic retaining ring (10) and the inner groove (50) are inserted into each other.

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