A tripod universal joint

Abstract

The present application discloses a three-ball universal joint, which relates to the technical field of universal joints. It includes a three-pin rack and a pin shaft. Three pin shafts are provided. The three pin shafts are arranged at intervals on the outer wall of the three-pin rack. Each pin shaft is sleeved with a ball ring. The inner diameter of the ball ring is larger than the outer diameter of the pin shaft. The outer wall of the pin shaft is provided with a mounting groove. The mounting groove is provided with a needle roller group. The needle roller group includes a transmission needle roller 1 and a transmission needle roller 2. The axial direction of the transmission needle roller 1 is parallel to the axial direction of the pin shaft, and the outer wall of the transmission needle roller 1 is pressed against the inner wall of the ball ring; the axial direction of the transmission needle roller 2 is parallel to the axial direction of the pin shaft, and the outer wall of the transmission needle roller 2 is pressed against the inner wall of the ball ring; the pin shaft is provided with an oil supply assembly, and the oil supply assembly supplies oil to the needle roller group; the oil supply assembly supplies oil to the needle roller group, so that the rotation of the needle roller group is more stable, the wear caused by friction during the rotation of the needle roller group is reduced, and the overall service life is improved.

Description

Technical Field

[0001] The present application relates to the field of universal joints, and more particularly, to a tripod universal joint. Background Art

[0002] A universal joint is a component that realizes variable-angle power transmission. It is used in positions where the direction of the transmission axis needs to be changed. It is the "joint" component of the universal joint device of the automobile drive system.

[0003] For example, Chinese utility patent publication number CN202007840U discloses a tripod universal joint comprising a tripod frame with a splined center portion, three pins evenly disposed on the tripod frame, each of which is fitted with a roller. The pins are shaped like a ball table, and the rollers comprise an outer roller, an inner roller, a needle roller, and a retaining ring. The inner roller is fitted over the pin, and the outer roller is fitted over the inner roller. Several needle rollers are disposed between the outer and inner rollers. A slot is provided on the inner sidewall of the lower portion of the outer roller, and a retaining ring is engaged within the slot. The retaining ring is in close contact with the lower end of the inner roller. This utility model features low internal friction, high transmission efficiency, and adjustable swing angle.

[0004] However, during the use of tripod joints, the quality of lubricating oil may deteriorate. In such cases, the friction of the needle rollers of the tripod joints may increase during rotation, causing increased wear of the needle rollers. This needs to be improved. Summary of the Invention

[0005] In order to improve the problem of increased needle roller wear caused by deterioration of lubricating oil quality, the present application provides a tripod universal joint.

[0006] The present application provides a tripod universal joint, which adopts the following technical solution:

[0007] A tripod universal joint comprises a tripod rack and a pin shaft, wherein three pin shafts are provided and spaced apart on the outer wall of the tripod rack, each pin shaft is sleeved with a ball ring, the inner diameter of the ball ring is larger than the outer diameter of the pin shaft, the outer wall of the pin shaft is provided with a mounting groove, and the mounting groove is provided with a needle roller group; the needle roller group comprises a transmission needle roller 1 and a transmission needle roller 2, the axial direction of the transmission needle roller 1 is parallel to the axial direction of the pin shaft, and the outer wall of the transmission needle roller 1 presses against the inner wall of the ball ring; the axial direction of the transmission needle roller 2 is parallel to the axial direction of the pin shaft, and the outer wall of the transmission needle roller 2 presses against the inner wall of the ball ring; the pin shaft is provided with an oil supply assembly, and the oil supply assembly supplies oil to the needle roller group.

[0008] Through the above technical solution, in actual use, due to the long-term use of the universal joint, the quality of the lubricating oil decreases, causing the rotation of the needle roller to slow down. At this time, the friction encountered by the needle roller group during rotation increases, and the wear of the needle roller group increases, which is easy to affect the subsequent universal joint. An oil supply component is provided to supply oil to the needle roller group through the oil supply component, making the rotation of the needle roller group more stable, reducing the wear caused by friction during the rotation of the needle roller group, and improving the overall service life.

[0009] Furthermore, the pin shaft is provided with an installation cavity and a liquid storage cavity, the oil supply assembly is located in the installation cavity, and the oil supply assembly includes a sliding block 1, a sliding block 2, a screw 1 and a screw 2, the sliding block 1 is threadedly connected to the screw 1, the sliding block 1 moves along the axial direction of the screw 1, the sliding block 1 is provided with a liquid inlet channel 1, the liquid storage cavity is provided with a liquid inlet pipe, and the liquid inlet pipe connects the liquid inlet channel 1 with the liquid storage cavity; the sliding block 2 is threadedly connected to the screw 2, the sliding block 2 moves along the axial direction of the screw 2, the sliding block 2 is provided with a liquid inlet channel 2, the liquid inlet channel 2 is used to connect the liquid inlet channel 1, and the end of the liquid inlet channel 2 away from the liquid inlet channel 1 is connected A liquid outlet pipe 1, an end of the liquid outlet pipe 1 away from the liquid inlet channel 2 is used to supply oil to the needle roller group; the transmission needle roller 1 is provided with a rotating shaft 1, the rotating shaft 1 is coaxially arranged with the transmission needle roller, and the rotating shaft 1 is connected to the screw 1 with a belt transmission; the transmission needle roller 2 is provided with a rotating shaft 2, the rotating shaft 2 is coaxially arranged with the transmission needle roller 2, and the rotating shaft 2 is connected to the screw 2 with a belt transmission; when the transmission needle roller 1 and the transmission needle roller 2 rotate, the rotating shaft 1 drives the screw 1 to rotate, and the rotation of the rotating shaft 2 causes the screw 2 to rotate; when the transmission needle roller 1 and the transmission needle roller 2 rotate at different speeds, the liquid inlet channel 1 is connected to the liquid inlet channel 2 to cause the liquid outlet pipe 1 to discharge liquid.

[0010] Through the above technical solution, in actual use, the transmission needle roller 1 and the transmission needle roller 2 rotate together, and when the lubricating oil at one transmission needle roller is not lubricating well, the rotation speed of the transmission needle roller 1 decreases. Therefore, the rotation speed of the transmission needle roller 1 and the transmission needle roller 2 is determined by the moving speed of the sliding block 1 and the sliding block 2. Secondly, when the transmission needle roller 1 and the transmission needle roller 2 are in the original position, the liquid inlet channel 1 and the liquid inlet channel 2 are not connected. When the transmission needle roller 1 and the transmission needle roller 2 rotate and the rotation speeds of the two are inconsistent, after maintaining this state for a rotation and movement time, if the difference in the moving distance of the sliding block 1 and the sliding block 2 reaches a set distance, the liquid inlet channel 1 is connected to the liquid inlet channel 2, and the liquid outlet pipe 1 discharges the liquid. This type of design makes the discharge of lubricating oil more in line with actual needs.

[0011] Furthermore, one end of the liquid outlet pipe 1 away from the liquid inlet channel 2 is directed toward the connection between the transmission needle roller 1 and the rotating shaft 1. The sliding block 2 is also provided with a liquid inlet channel 3. The liquid inlet channel 3 is used to communicate with the liquid inlet channel 1. The end of the liquid inlet channel 3 away from the sliding block 1 supplies oil to the connection between the transmission needle roller 2 and the rotating shaft 2. The liquid inlet channel 1 is located between the liquid inlet channel 2 and the liquid inlet channel 3.

[0012] Through the above technical solution, in actual use, if only liquid inlet channel 2 is set, it is impossible to judge whether transmission needle roller 1 or transmission needle roller 2 needs to be replenished with lubricating oil when lubricating oil needs to be discharged. If oil supply is not achieved, it is often necessary to provide lubricating oil to transmission needle roller 1 and transmission needle roller 2 at the same time, and there is a situation where the lubricating oil supply is inaccurate; therefore, liquid inlet channel 3 is set, and liquid inlet channel 1 is located between liquid inlet channel 2 and liquid inlet channel 3. When the rotation speeds of transmission needle roller 1 and transmission needle roller 2 are different, the moving speeds of sliding block 1 and sliding block 2 are also different. Liquid inlet channel 1 is connected to liquid inlet channel 2 or liquid inlet channel 3, so that liquid inlet channel 1 replenishes lubricating oil to transmission needle roller 1 or transmission needle roller 2, making the replenishment of lubricating oil more accurate.

[0013] Furthermore, the transmission needle roller 1 is provided with a liquid storage tank, which is located at the end of the transmission needle roller 1 close to the liquid outlet pipe 1 and away from the liquid inlet channel 2, and is located at the connection between the transmission needle roller 1 and the rotating shaft 1.

[0014] Through the above technical solution, in actual use, when the lubricating oil moves to the connection between the transmission needle roller 1 and the rotating shaft 1, the lubricating oil moves toward the side wall of the transmission needle roller due to the centrifugal force of the rotation of the transmission needle roller 1, so that the lubricating oil cannot enter the connection between the transmission needle roller 1 and the rotating shaft 1 to play the due lubricating effect. Therefore, a liquid storage tank is provided, and the situation of the lubricating oil moving to the side wall of the transmission needle roller is reduced by limiting the position of the liquid storage tank. Secondly, it is convenient for the lubricating oil to enter the connection between the transmission needle roller 1 and the rotating shaft 1 from the position of the liquid storage tank.

[0015] Furthermore, the liquid outlet pipe 1 is provided with a liquid dripping nozzle, and the liquid dripping nozzle is located at an end of the liquid outlet pipe 1 away from the sliding block 2.

[0016] Through the above technical solution, a drop nozzle is set to limit the outflow speed of the lubricating oil from the liquid outlet pipe 1, reduce the overflow of the lubricating oil from the liquid storage tank, and facilitate the lubricating oil in the liquid storage tank to enter the connection between the transmission needle roller 1 and the rotating shaft 1.

[0017] Furthermore, the pin shaft is provided with a mounting hole, which is located at the end of the pin shaft away from the three-pin bracket, and the mounting hole passes through the pin shaft to the liquid storage chamber; the liquid storage chamber is provided with a counterweight plate, and the counterweight plate slides in the liquid storage chamber, and the sliding direction of the counterweight plate is the axial direction of the pin shaft, and the outer wall of the counterweight plate is pressed against the wall of the liquid storage chamber.

[0018] When the oil is fed back into the oil pump, the oil will not flow into the oil pumping station, and the oil pumping station will be in a state of emergency. When the oil is fed back into the oil pump, the oil will not flow into the oil pumping station, and the oil pumping station will be in a state of emergency. When the oil is fed back into the oil pump, the oil will not flow into the oil pumping station, and the oil pumping station will be in a state of emergency. When the oil is fed back into the oil pump, the oil will not flow into the oil pump, and the oil pumping station will be in a state of emergency.

[0019] Furthermore, the screw rod 1 is provided with a threaded section. When the sliding block 1 moves along the axis direction of the screw rod 1 due to the rotation of the screw rod 1, the threaded section limits the moving distance of the sliding block 1.

[0020] Through the above technical solution, in actual use, the moving distance of the sliding block 1 is determined by the length of the threaded section of the screw 1. During the use of the universal joint, there is a situation where the rotation direction of the ball ring does not change for a certain period of time. Therefore, it is necessary to increase the length of the screw 1 to meet actual needs. However, this method increases the restrictions on component formulation and installation, which is very inconvenient. Therefore, the moving distance of the sliding block 1 is limited by the threaded section to reduce the excessive movement of the sliding block 1.

[0021] Furthermore, one end of the pin shaft away from the connection between the pin shaft and the tripod bracket is in an arc shape.

[0022] Through the above technical solution, the end of the pin shaft away from the connection between itself and the tripod is set in an arc shape, so that the wear of the pin shaft when connected to the external device is reduced, the use of the universal joint is more stable, and the service life of the component is improved.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] (1) By providing an oil supply component and supplying oil to the needle roller assembly through the oil supply component, the rotation of the needle roller assembly is made more stable, the wear caused by friction during the rotation of the needle roller assembly is reduced, and the overall service life is improved;

[0025] (2) By setting a sliding block 1, a sliding block 2, a screw 1 and a screw 2, when the difference in the moving distance between the sliding block 1 and the sliding block 2 reaches the set distance, the liquid inlet channel 1 is connected to the liquid inlet channel 2, and the liquid outlet pipe 1 discharges the liquid. This design makes the discharge of the lubricating oil more in line with actual needs;

[0026] (3) By setting up the liquid inlet channel three and making the liquid inlet channel one located between the liquid inlet channel two and the liquid inlet channel three, when the rotation speeds of the transmission needle roller one and the transmission needle roller two are different, the movement speeds of the sliding block one and the sliding block two are also different. The liquid inlet channel one is connected to the liquid inlet channel two or the liquid inlet channel three, so that the liquid inlet channel one can replenish the lubricating oil to the transmission needle roller one or the transmission needle roller two, making the replenishment of the lubricating oil more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the overall embodiment.

[0028] Figure 2 Schematic diagram of a ball removal ring according to an embodiment.

[0029] Figure 3 It is a partial schematic diagram of an embodiment.

[0030] Figure 4 Schematic cross-sectional view of an embodiment.

[0031] Figure 5 for Figure 4 A is an enlarged schematic diagram.

[0032] Figure markings: 1. Three-pin bracket; 2. Pin shaft; 3. Limiting ring; 4. Limiting ring groove; 5. Ball ring; 6. Mounting groove; 7. Rotating shaft one; 8. Rotating shaft two; 9. Needle roller assembly; 10. Transmission needle roller one; 11. Transmission needle roller two; 12. Liquid storage tank; 13. Mounting cavity; 14. Oil storage cavity; 15. Oil supply assembly; 151. Sliding block one; 152. Sliding block two; 153. Screw one; 154. Screw two; 16. Transmission pulley; 17. Connecting pulley; 18. Belt; 19. Mounting hole; 20. Closing plate; 21. Counterweight plate; 22. Liquid inlet pipe; 23. Liquid inlet channel one; 24. Liquid inlet channel two; 25. Liquid inlet channel three; 26. Liquid outlet pipe one; 27. Liquid outlet pipe two; 28. Drip nozzle; 29. Return spring. DETAILED DESCRIPTION

[0033] The present application is further described in detail below with reference to the accompanying drawings.

[0034] The embodiments of the present application disclose a tripod universal joint.

[0035] Example:

[0036] See also Figure 1 and Figure 2A tripod universal joint comprises a tripod frame 1 and a pin 2. There are three pins 2, which are arranged at intervals on the outer wall of the tripod frame 1. The end of the pin 2 away from the tripod frame 1 is in an arc shape. Each pin 2 is provided with a limiting ring 3 and a ball ring 5. The pin 2 is provided with a limiting ring 3 groove. The limiting ring 3 is located in the limiting ring 3 groove. The end of the limiting ring 3 away from the bottom of the limiting ring 3 groove protrudes from the side wall of the pin 2. There are two limiting rings 3. The ball ring 5 is located between the two limiting rings 3. The height of the ball ring 5 is slightly smaller than the distance between the two limiting rings 3. The ball ring 5 is sleeved on the outer wall of the pin 2 and can move along the axis direction of the pin 2. The inner diameter of the ball ring 5 is larger than the outer diameter of the pin 2, and the rotation axis of the ball ring 5 is the axis of the pin 2.

[0037] See also Figure 2 and Figure 3 The outer wall of the pin 2 is provided with a mounting groove 6, through which are passed rotating shaft 1 7 and rotating shaft 2 8. The axis of rotating shaft 1 7 is parallel to the axis of the pin 2, and the axis of rotating shaft 2 8 is parallel to the axis of rotating shaft 1 7. Rotating shafts 1 7 and rotating shaft 2 8 rotate on the pin 2. A needle roller assembly 9 is provided in the mounting groove 6, which includes a transmission needle roller 10 and a transmission needle roller 2 11. Transmission needle roller 10 is sleeved on rotating shaft 1 7. The axis of rotation of transmission needle roller 10 is aligned with the axis of rotation of rotation shaft 1 7. Transmission needle roller 10 rotates together with rotating shaft 1 7. The outer wall of transmission needle roller 10 abuts against the inner wall of ball ring 5. Transmission needle roller 2 11 is sleeved on rotating shaft 2 8. The axis of rotation of transmission needle roller 2 11 is aligned with the axis of rotation of rotation shaft 2 8. Transmission needle roller 2 11 rotates together with rotating shaft 2 8. The outer wall of transmission needle roller 2 11 abuts against the inner wall of ball ring 5. In actual use, a plurality of needle roller assemblies 9 are provided along the circumference of the pin shaft 2 .

[0038] See also Figure 3 and Figure 4 Transmission needle roller 10 is equipped with a fluid reservoir 12. This reservoir 12 is located at the end of transmission needle roller 10 away from the axis of tripod 1, at the junction of transmission needle roller 10 and rotating shaft 17. Reservoir 12 is used to store lubricating oil. In actual use, transmission needle roller 2 11 is also equipped with a fluid reservoir 12. Reservoir 12 may also be equipped with a drainage channel connected to the side wall of transmission needle roller 10 to reduce friction between transmission needle roller 10 and the inner wall of ball ring 5.

[0039] Pin 2 is provided with a mounting cavity 13 and an oil reservoir 14. Mounting cavity 13 houses an oil supply assembly 15, which includes a first slide block 151, a second slide block 152, a first screw 153, and a second screw 154. Both first and second screws 153 and 154 have threaded sections. First slide block 151 is threadedly connected to the threaded section of first screw 153, allowing it to move along the axis of first screw 153. Second slide block 152 is threadedly connected to the threaded section of second screw 154, allowing it to move along the axis of second screw 154. The threaded sections of screw 153 and screw 2 154 restrict excessive movement of sliding block 151 and sliding block 2 152. Furthermore, because the length of the threaded sections is limited, during the continuous rotation of screw 153 and screw 2 154, if the speed difference between them is small, the difference in movement between sliding block 151 and sliding block 2 152 is not noticeable. Drive needle roller 10 is equipped with a drive pulley 16, and screw 153 is equipped with a connecting pulley 17. Belt 18 is mounted on the outer walls of drive pulley 16 and connecting pulley 17. The drive needle roller drives screw 153 via belt 18. In actual use, drive needle roller 10 can also drive screw 153 via a chain drive.

[0040] The pin shaft 2 is provided with a mounting hole 19 and a closing plate 20. The mounting hole 19 is located at the end of the pin shaft 2 away from the tripod frame 1. The mounting hole 19 passes through the pin shaft 2 to the oil storage chamber 14. The closing plate 20 is used to close the mounting hole 19. The oil storage chamber 14 is provided with a counterweight plate 21. The counterweight plate 21 slides in the oil storage chamber 14. The sliding direction of the counterweight plate 21 is the axial direction of the pin shaft 2. The outer wall of the counterweight plate 21 is pressed against the wall of the oil storage chamber 14. In actual use, the counterweight plate 21 can be provided with an auxiliary protrusion. The auxiliary protrusion is located at the end of the counterweight plate 21 away from the bottom of the oil storage chamber 14. The setting of the auxiliary protrusion makes it easier for the user to move the counterweight plate 21. Secondly, the counterweight plate 21 needs to be provided with a reset spring 29, and the elastic force of the reset spring 29 causes the counterweight plate 21 to move toward the bottom of the oil storage chamber 14.

[0041] See also Figure 4 and Figure 5The oil storage chamber 14 is provided with a liquid inlet pipe 22, which is connected to the oil storage chamber 14. The sliding block 151 is provided with a liquid inlet channel 1 23, and the end of the liquid inlet pipe 22 away from the oil storage chamber 14 is connected to the liquid inlet channel 1 23. The sliding block 2 152 is provided with a liquid inlet channel 2 24 and a liquid inlet channel 3 25. The liquid inlet channel 2 24 and the liquid inlet channel 3 25 are located on the upper and lower sides of the liquid inlet channel 1 23, respectively. The liquid inlet channel 2 24 is located below the liquid inlet channel 3 25. The end of the liquid inlet channel 2 24 away from the liquid inlet channel 1 23 is connected to the liquid outlet pipe 1 26. The end of the liquid outlet pipe 1 26 away from the liquid inlet channel 2 24 is used to supply oil to the transmission needle roller 1 10. The end of the liquid inlet channel 3 25 away from the liquid inlet channel 1 23 is connected to the liquid outlet pipe 2 27. The end of the liquid outlet pipe 2 27 away from the liquid inlet channel 3 25 faces the oil storage tank slot. The liquid outlet pipe 2 27 is used to supply oil to the transmission needle roller 2 11.

[0042] When ball ring 5 rotates, it contacts drive roller 10 and drive roller 2 11, causing them to rotate. Drive pulley 16 on rotating shaft 17 rotates, driving pulley 17 connecting screw 153. This rotation of screw 153 causes slide block 151 to move along the axis of screw 153. Drive pulley 16 on rotating shaft 2 8 rotates pulley 17 connecting screw 2 154. This rotation of screw 2 154 causes slide block 2 152 to move along the axis of screw 2 154. When drive roller 10 and drive roller 2 11 rotate at different speeds, liquid inlet channel 1 23 connects with liquid inlet channel 2 24, allowing liquid to flow out of liquid outlet pipe 1 26.

[0043] The first outlet pipe 26 is provided with a dropper 28, which is located at the end of the first outlet pipe 26 away from the second sliding block 152. The dropper 28 is used to limit the outlet speed of the lubricating oil. In actual use, the second outlet pipe 27 is also provided with a dropper 28.

[0044] The working principle of this embodiment is:

[0045] In actual use, when ball ring 5 rotates, it drives transmission needle roller 10 and transmission needle roller 2 11 to rotate. The rotation of transmission needle roller 10 and transmission needle roller 2 11 causes sliding block 151 and sliding block 2 152 to move. The speed difference between sliding block 151 and sliding block 2 152 allows liquid inlet channel 1 23 to connect with liquid inlet channel 2 24, or liquid inlet channel 1 23 to connect with liquid inlet channel 3 25, thus ensuring more precise lubricating oil supply.

[0046] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A tripod universal joint comprising a tripod bracket (1) and a pin shaft (2), characterized in that: There are three pin shafts (2), and the three pin shafts (2) are spaced apart and arranged on the outer wall of the three-pin frame (1). Each of the pin shafts (2) is provided with a ball ring (5), and the inner diameter of the ball ring (5) is larger than the outer diameter of the pin shaft (2). The outer wall of the pin shaft (2) is provided with a mounting groove (6), and the mounting groove (6) is provided with a needle roller group (9); the needle roller group (9) includes a transmission needle roller 1 (10) and a transmission needle roller 2 (11), the axial direction of the transmission needle roller 1 (10) is parallel to the axial direction of the pin shaft (2), and the outer wall of the transmission needle roller 1 (10) is pressed against the inner wall of the ball ring (5); the axial direction of the transmission needle roller 2 (11) is parallel to the axial direction of the pin shaft (2), and the outer wall of the transmission needle roller 2 (11) is pressed against the inner wall of the ball ring (5); the pin shaft (2) is provided with an oil supply component (15), and the oil supply component (15) supplies oil to the needle roller group (9); The pin shaft (2) is provided with a mounting cavity (13) and an oil storage cavity (14); the oil supply assembly (15) is located in the mounting cavity (13); the oil supply assembly (15) includes a sliding block 1 (151), a sliding block 2 (152), a screw rod 1 (153) and a screw rod 2 (154); the sliding block 1 (151) is threadedly connected to the screw rod 1 (153); the sliding block 1 (151) moves along the axial direction of the screw rod 1 (153); the sliding block 1 (151) is provided with a liquid inlet channel 1 (23); the oil storage cavity (14) is provided with a liquid inlet pipe (22); the liquid inlet pipe (22) connects the liquid inlet channel 1 (23) and the oil storage cavity (14); The second sliding block (152) is threadedly connected to the second screw rod (154), and the second sliding block (152) moves along the axial direction of the second screw rod (154). The second sliding block (152) is provided with a second liquid inlet channel (24), and the second liquid inlet channel (24) is used to connect with the first liquid inlet channel (23). The end of the second liquid inlet channel (24) away from the first liquid inlet channel (23) is connected with the first liquid outlet pipe (26), and the end of the first liquid outlet pipe (26) away from the second liquid inlet channel (24) is used to supply oil to the needle roller group (9); The transmission needle roller 1 (10) is provided with a rotating shaft 1 (7), the rotating shaft 1 (7) is coaxially arranged with the transmission needle roller 1 (10), and the rotating shaft 1 (7) is connected to the screw rod 1 (153) through a belt transmission; the transmission needle roller 2 (11) is provided with a rotating shaft 2 (8), the rotating shaft 2 (8) is coaxially arranged with the transmission needle roller 2 (11), and the rotating shaft 2 (8) is connected to the screw rod 2 (154) through a belt transmission; when the transmission needle roller 1 (10) and the transmission needle roller 2 (11) rotate, the rotating shaft 1 (7) drives the screw rod 1 (153) to rotate, and the rotating shaft 2 (8) rotates to cause the screw rod 2 (154) to rotate; when the transmission needle roller 1 (10) and the transmission needle roller 2 (11) rotate at different speeds, the liquid inlet channel 1 (23) is connected to the liquid inlet channel 2 (24) to cause the liquid outlet pipe 1 (26) to discharge liquid.

2. The tripod universal joint according to claim 1, characterized in that: The end of the liquid outlet pipe 1 (26) away from the liquid inlet channel 2 (24) faces the connection between the transmission needle roller 1 (10) and the rotating shaft 1 (7). The sliding block 2 (152) is also provided with a liquid inlet channel 3 (25). The liquid inlet channel 3 (25) is used to communicate with the liquid inlet channel 1 (23). The end of the liquid inlet channel 3 (25) away from the sliding block 1 (151) supplies oil to the connection between the transmission needle roller 2 (11) and the rotating shaft 2 (8). The liquid inlet channel 1 (23) is located between the liquid inlet channel 2 (24) and the liquid inlet channel 3 (25).

3. The tripod universal joint according to claim 2, characterized in that: The transmission needle roller 1 (10) is provided with a liquid storage tank (12), and the liquid storage tank (12) is located at one end of the transmission needle roller 1 (10) close to the liquid outlet pipe 1 (26) and away from the liquid inlet channel 2 (24), and is located at the connection between the transmission needle roller 1 (10) and the rotating shaft 1 (7).

4. The tripod universal joint according to claim 2, characterized in that: The liquid outlet pipe 1 (26) is provided with a liquid drop nozzle (28), and the liquid drop nozzle (28) is located at one end of the liquid outlet pipe 1 (26) away from the sliding block 2 (152).

5. The tripod universal joint according to claim 4, characterized in that: The pin shaft (2) is provided with a mounting hole (19), the mounting hole (19) is located at one end of the pin shaft (2) away from the tripod bracket (1), and the mounting hole (19) passes through the pin shaft (2) to the oil storage chamber (14); the oil storage chamber (14) is provided with a counterweight plate (21), the counterweight plate (21) slides in the oil storage chamber (14), the sliding direction of the counterweight plate (21) is the axial direction of the pin shaft (2), and the outer wall of the counterweight plate (21) is pressed against the wall of the oil storage chamber (14).

6. The tripod universal joint according to claim 1, characterized in that: The screw rod 1 (153) is provided with a threaded section. When the sliding block 1 (151) moves along the axial direction of the screw rod 1 (153) due to the rotation of the screw rod 1 (153), the threaded section limits the moving distance of the sliding block 1 (151).

7. The tripod universal joint according to claim 1, characterized in that: The end of the pin shaft (2) away from the connection between the pin shaft and the tripod bracket (1) is in an arc shape.

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