Grease-injection-free cross universal joint

Abstract

The utility model relates to the field of universal joint bearings, and discloses a grease-injection-free cross universal joint which comprises a cross shaft, a driven shaft, a driven fork, a driving fork, a driving shaft and four through holes, the driven shaft is arranged at the lower end of the driven fork, the driving shaft is arranged at the upper end of the driving fork, the four through holes are formed in the end of the driving fork and the end of the driven fork respectively, and the cross shaft is arranged in the through holes. The four ends of the cross shaft are sleeved with check blocks, the four ends, close to the outer side of the cross shaft, of the four check blocks are sleeved with sealing structures, the four ends, close to the outer side of the cross shaft, of the four sealing structures are each provided with a plurality of roller pins in a circular arrangement mode, and the outer sides of the roller pins are each sleeved with a self-lubricating metal layer. And connecting caps are arranged at four end parts of the cross shaft on the outer sides of the plurality of roller pins. According to the utility model, the sealing performance is improved through the sealing structure, dust and impurities are prevented from entering, the self-lubricating metal layer is self-lubricated during use, the service life is prolonged, and the maintenance frequency can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of universal joint bearings, in particular to a grease-free cross universal joint. Background Art

[0002] The cross-axis universal joint bearing is a component that realizes variable-angle power transmission and is an important component in the automobile transmission system. The port position of the cross-axis ring is also equipped with a sealing ring and a dust cover that are used to cooperate with the end head and play a sealing and dust-proof role.

[0003] Currently, the seals used in cross universal joints are usually made of rubber, which is prone to leakage after long-term use. Dust and impurities entering the seals can easily affect the service life of the needle rollers, and regular lubrication oil must be added for maintenance. Therefore, those skilled in the art have provided a grease-free cross universal joint to solve the problems raised in the above background technology. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a grease-free cross universal joint. When rotating, the magnetic dynamic sealing ring follows the connection cap to rotate. At the same time, the magnetic static sealing ring is attracted by the magnetic dynamic sealing ring. The adsorption force is sufficient to overcome the friction between the sealing surfaces, thereby achieving sealing. The sealing compensation is then performed by two O-rings to improve the overall sealing performance.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a grease-free cross universal joint, comprising a cross shaft, a driven shaft, a driven fork, an active fork, an active shaft and four through holes, the driven shaft being arranged at the lower end of the driven fork, the active shaft being arranged at the upper end of the active fork, the four through holes being respectively arranged at the ends of the active fork and the driven fork, the four ends of the cross shaft being sleeved with blocks, the four ends of the four blocks being sleeved with sealing structures at the four ends of the cross shaft near the outer sides, the four ends of the cross shaft near the outer sides of the four sealing structures being circularly arranged with multiple needle rollers, the outer sides of the multiple needle rollers being sleeved with self-lubricating metal layers, the four ends of the cross shaft outside the multiple needle rollers being provided with connecting caps, the outer side walls of the four connecting caps being rectangularly arranged with four second wedge grooves, the inner side walls of the four through holes being rectangularly arranged with four first wedge grooves, the sixteen first wedge grooves being internally provided with wedges, and the inner side walls of the four connecting caps being close to the ends being provided with grooves;

[0006] Through the above technical solution, the sealing structure is used to improve the sealing performance to prevent dust and impurities from entering, and the self-lubricating metal layer is used to lubricate itself during use, thereby increasing the service life and reducing the number of maintenance times. The wedge is then inserted into the first wedge groove and the second wedge groove to improve the axial connectivity between the connecting cap and the through hole.

[0007] Furthermore, the sealing structure includes a magnetic static sealing ring and a magnetic dynamic sealing ring, the magnetic dynamic sealing ring is fixedly connected inside the groove, and the magnetic static sealing ring is sleeved on the outside of the magnetic dynamic sealing ring;

[0008] Through the above technical solution, the magnetic dynamic sealing ring rotates with the connecting cap. During the rotation, the magnetic static sealing ring is attracted by the magnetic dynamic sealing ring. The adsorption force is sufficient to overcome the friction between the sealing surfaces, thereby achieving sealing.

[0009] Furthermore, storage grooves are provided on the outer wall of the magnetic dynamic sealing ring, one end face of the magnetic dynamic sealing ring, the inner wall of the magnetic static sealing ring and the inner wall of the end face of the magnetic static sealing ring, and two O-rings are provided inside the four storage grooves;

[0010] The above technical solution facilitates sealing supplementation through the O-ring, thereby improving sealing performance.

[0011] Furthermore, the self-lubricating metal layer is a wear-resistant metal with a solid lubricant;

[0012] Through the above technical solution, when friction occurs on the metal surface, these solid lubricants will be released and form a lubricating film, reducing direct contact between the metal surfaces, thereby reducing friction and wear.

[0013] Furthermore, the four connecting caps are slidably connected to the inside of the four through holes respectively, and the sixteen first wedge grooves and the sixteen second wedge grooves are correspondingly arranged;

[0014] Through the above technical solution, the sixteen wedges can be easily installed inside the sixteen first wedge grooves and the sixteen second wedge grooves.

[0015] Furthermore, the sixteen wedges are respectively slidably connected inside the sixteen first wedge grooves and the sixteen second wedge grooves;

[0016] Through the above technical solution, it is convenient to insert the sixteen wedges into the sixteen first wedge grooves and the sixteen second wedge grooves, so that the friction between the four connecting caps and the four through holes is greater.

[0017] The utility model has the following beneficial effects:

[0018] 1. In the present invention, when the grease-free universal joint rotates, the magnetic dynamic sealing ring rotates along with the connecting cap. During the rotation, the magnetic static sealing ring is attracted by the magnetic dynamic sealing ring. The adsorption force is sufficient to overcome the friction between the sealing surfaces, thereby achieving sealing. The two O-rings are then used for sealing compensation to improve the overall sealing performance.

[0019] 2. In the present invention, during installation, four connecting caps are sleeved on the four ends of the cross shaft, and then the four connecting caps are passed through the four through holes. The corresponding sixteen first wedge grooves and sixteen second wedge grooves are rotated to corresponding positions, and the sixteen wedges are inserted between the first wedge grooves and the second wedge grooves to prevent wear between the through holes and the connecting caps due to long-term use, which may cause corresponding rotation and power loss.

[0020] 3. In the present invention, the solid lubricant contained in the self-lubricating metal layer can continuously provide lubrication for the friction surface, and a lubricating film can be formed during the friction process, thereby reducing the friction coefficient and wear, increasing the service life of the equipment, reducing maintenance costs, and reducing the number of maintenance times. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional diagram of a grease-free universal joint proposed by the utility model;

[0022] Figure 2 This is a three-dimensional cross-sectional view of a grease-free universal joint proposed by the utility model;

[0023] Figure 3 for Figure 1 A magnified schematic diagram of point A in the middle;

[0024] Figure 4 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0025] Legend:

[0026] 1. Cross shaft; 2. Wedge; 3. Driven shaft; 4. Driven fork; 5. Active fork; 6. Active shaft; 7. Sealing structure; 701. Magnetic static sealing ring; 702. O-ring; 703. Magnetic dynamic sealing ring; 704. Storage groove; 8. First wedge groove; 9. Second wedge groove; 10. Connecting cap; 11. Needle roller; 12. Self-lubricating metal layer; 13. Groove; 14. Through hole; 15. Stopper. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Reference Figure 1-4The utility model provides an embodiment: a grease-free cross universal joint, including a cross shaft 1, a driven shaft 3, a driven fork 4, an active fork 5, a driving shaft 6 and four through holes 14. The driven shaft 3 is arranged at the lower end of the driven fork 4, the active shaft 6 is arranged at the upper end of the active fork 5, and the four through holes 14 are respectively arranged at the ends of the active fork 5 and the driven fork 4. The four ends of the cross shaft 1 are all sleeved with blocks 15. The four ends of the cross shaft 1 near the outside of the four blocks 15 are all sleeved with sealing structures 7. The sealing structure 7 improves the sealing performance and prevents dust and impurities from entering. The four ends of the cross shaft 1 near the outside of the four sealing structures 7 are all circularly arranged with multiple needle rollers 11 The outer sides of the multiple needle rollers 11 are all sleeved with a self-lubricating metal layer 12, which is then self-lubricated during use by the self-lubricating metal layer 12, thereby increasing the service life and reducing the number of maintenance times. The four ends of the cross shaft 1 on the outer sides of the multiple needle rollers 11 are all provided with connecting caps 10, and the outer walls of the four connecting caps 10 are all arranged in a rectangular manner and provided with four second wedge grooves 9. The inner walls of the four through holes 14 are all arranged in a rectangular manner and provided with four first wedge grooves 8. The sixteen first wedge grooves 8 are all provided with wedges 2. The inner walls of the four connecting caps 10 are all provided with grooves 13 near the ends, and then the wedges 2 are inserted into the first wedge grooves 8 and the second wedge grooves 9 to improve the axial connectivity between the connecting caps 10 and the through holes 14.

[0029] The sealing structure 7 includes a magnetic static sealing ring 701 and a magnetic dynamic sealing ring 703. The magnetic dynamic sealing ring 703 is fixedly connected to the inside of the groove 13. The magnetic static sealing ring 701 is sleeved on the outside of the magnetic dynamic sealing ring 703 and rotates following the connecting cap 10 through the magnetic dynamic sealing ring 703. While rotating, the magnetic static sealing ring 701 is attracted by the magnetic dynamic sealing ring 703. The adsorption force is sufficient to overcome the friction between the sealing surfaces, thereby achieving sealing. Storage grooves 704 are provided on the outer wall of the magnetic dynamic sealing ring 703, one end face of the magnetic dynamic sealing ring 703, the inner wall of the magnetic static sealing ring 701, and the inner wall of the end face of the magnetic static sealing ring 701. Two O-rings 702 are provided inside the four storage grooves 704, which are convenient for sealing and replenishing through the O-ring 702 to improve the sealing performance.

[0030] The self-lubricating metal layer 12 is a wear-resistant metal with solid lubricants. When friction occurs on the metal surface, these solid lubricants will be released and form a lubricating film, reducing direct contact between the metal surfaces, thereby reducing friction and wear. The four connecting caps 10 are respectively slidably connected to the inside of the four through holes 14, and the sixteen first wedge grooves 8 and the sixteen second wedge grooves 9 are correspondingly arranged, which facilitates the sixteen wedges 2 to be installed in the sixteen first wedge grooves 8 and the sixteen second wedge grooves 9. The sixteen wedges 2 are respectively slidably connected to the inside of the sixteen first wedge grooves 8 and the sixteen second wedge grooves 9, which facilitates the sixteen wedges 2 to be inserted into the sixteen first wedge grooves 8 and the sixteen second wedge grooves 9, so that the friction between the four connecting caps 10 and the four through holes 14 is greater.

[0031] Working principle: When in use, the active fork 5 and the driven fork 4 rotate, and the four connecting caps 10 rotate along with the active fork 5 and the driven fork 4. When rotating, the magnetic dynamic sealing ring 703 rotates along with the connecting cap 10. While rotating, the magnetic static sealing ring 701 is attracted by the magnetic dynamic sealing ring 703. The adsorption force is sufficient to overcome the friction between the sealing surfaces, thereby achieving sealing. Then, the two O-rings 702 are used for sealing compensation to improve the overall sealing performance. When installing, the four connecting caps 10 are sleeved on the four ends of the cross shaft 1, and then the four connecting caps 10 are tightened. Pass through the four through holes 14, rotate the corresponding sixteen first wedge grooves 8 and sixteen second wedge grooves 9 to the corresponding positions, and insert the sixteen wedges 2 between the first wedge grooves 8 and the second wedge grooves 9 to prevent wear between the through holes 14 and the connecting cap 10 due to long-term use, which may cause corresponding rotation and power loss. The solid lubricant contained in the self-lubricating metal layer 12 can continuously provide lubrication for the friction surface, and a lubricating film can be formed during the friction process, thereby reducing the friction coefficient and wear, thereby increasing the service life of the equipment, reducing maintenance costs, and reducing the number of maintenance times.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A grease-free universal joint, comprising a cross shaft (1), a driven shaft (3), a driven fork (4), an active fork (5), an active shaft (6) and four through holes (14), wherein the driven shaft (3) is arranged at the lower end of the driven fork (4), the active shaft (6) is arranged at the upper end of the active fork (5), and the four through holes (14) are respectively arranged at the ends of the active fork (5) and the driven fork (4), characterized in that: The four ends of the cross shaft (1) are sleeved with stoppers (15), and the four ends of the cross shaft (1) near the outer side of the four stoppers (15) are sleeved with sealing structures (7). The four ends of the cross shaft (1) near the outer side of the four sealing structures (7) are circularly arranged with multiple needle rollers (11), and the outer sides of the multiple needle rollers (11) are sleeved with self-lubricating metal layers (12). The four ends of the cross shaft (1) outside the multiple needle rollers (11) are provided with connecting caps (10), and the outer side walls of the four connecting caps (10) are rectangularly arranged with four second wedge grooves (9), and the inner side walls of the four through holes (14) are rectangularly arranged with four first wedge grooves (8), and the sixteen first wedge grooves (8) are provided with wedges (2) inside. The inner side walls of the four connecting caps (10) are close to the ends with grooves (13).

2. The grease-free universal joint according to claim 1, characterized in that: The sealing structure (7) comprises a magnetic static sealing ring (701) and a magnetic dynamic sealing ring (703); the magnetic dynamic sealing ring (703) is fixedly connected inside the groove (13); and the magnetic static sealing ring (701) is sleeved on the outside of the magnetic dynamic sealing ring (703).

3. The grease-free universal joint according to claim 2, characterized in that: Storage grooves (704) are provided on the outer wall of the magnetic dynamic sealing ring (703), one end face of the magnetic dynamic sealing ring (703), the inner wall of the magnetic static sealing ring (701), and the inner wall of the end face of the magnetic static sealing ring (701). Two O-type sealing rings (702) are provided inside the four storage grooves (704).

4. The grease-free universal joint according to claim 1, characterized in that: The self-lubricating metal layer (12) is a wear-resistant metal with a solid lubricant.

5. The grease-free universal joint according to claim 1, characterized in that: The four connecting caps (10) are respectively slidably connected inside the four through holes (14), and the sixteen first wedge grooves (8) and the sixteen second wedge grooves (9) are correspondingly arranged.

6. The grease-free universal joint according to claim 1, characterized in that: The sixteen wedges (2) are respectively slidably connected inside the sixteen first wedge grooves (8) and the sixteen second wedge grooves (9).

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