Transmission shaft assembly with adjustable power transmission length

Abstract

The transmission shaft assembly with the adjustable power transmission length comprises a first transmission shaft and a second transmission shaft, a connector is arranged on the first transmission shaft, a through cavity is formed in the connector, an adjusting rod is arranged on the second transmission shaft, a plurality of straight tooth grooves are formed in the adjusting rod, the adjusting rod can be adjusted in a telescopic mode along the through cavity, and a plurality of installation portions are arranged at the end of the connector. A straight tooth claw is mounted on the mounting part, a plurality of claw teeth are arranged on the inner side of the straight tooth claw, a positioning sleeve is further mounted at the joint of the first transmission shaft and the second transmission shaft, and the positioning sleeve presses the straight tooth claw in the corresponding straight tooth groove to fix the first transmission shaft and the second transmission shaft; the purely mechanical ingenious structural design is adopted, the overall structure is simple, motor driving is not needed, and the device is suitable for popularization; the length of the driving shaft can be flexibly adjusted, after the proper length is adjusted, the straight tooth claws can be pressed by the pressing structures after the driving shaft is in place, and when claw teeth of the straight tooth claws are meshed with the straight tooth grooves to achieve clamping and positioning, the positioning sleeve cannot be loosened and is very stable.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, specifically relating to a drive shaft assembly with adjustable power transmission length. Background Technology

[0002] The driveshaft assembly is installed between the transmission and the rear axle, transmitting the torque and rotational motion from the transmission to the final drive of the rear axle.

[0003] Existing conventional drive shafts have a fixed length, which cannot be adjusted and suffers from poor versatility. When users need a longer drive shaft for installation, they must find a drive shaft that meets their specifications, causing great inconvenience. To solve this problem, Chinese Patent Publication No. CN 221145007U discloses a drive shaft with adjustable length, which includes a shaft body and a connecting seat. A servo motor is fixedly connected to the top of the inner wall of the shaft body, and a screw is fixedly connected to the drive end of the servo motor. Semicircular grooves are formed on all four sides of the inner wall of the shaft body. An extension shaft is provided inside the shaft body, and semicircular protrusions are fixedly connected to all four sides of the outer wall of the extension shaft. The outer walls of the semicircular protrusions are slidably connected to the inner walls of the semicircular grooves. A threaded hole is formed at the center of the top of the extension shaft. In this invention, a servo motor drives the screw to rotate, which in turn drives the extension shaft to move up and down. The semi-circular groove and semi-circular protrusion limit the extension shaft's telescopic movement, thus ensuring that the shaft can be adjusted in length.

[0004] However, the above-mentioned method of adjusting the drive shaft by driving the screw drive through a servo motor is firstly complex in structure, and secondly, the servo motor is installed inside the drive shaft, and the drive shaft needs to rotate at high speed, making it difficult to connect the motor inside the shaft to external wiring. Utility Model Content

[0005] This utility model provides a power transmission length adjustable drive shaft assembly. The length can be flexibly adjusted. After the appropriate length is adjusted, the clamping structure will clamp the straight toothed claw. When the claw teeth of the straight toothed claw mesh with the straight tooth groove to achieve fixed positioning, the positioning sleeve will not loosen and is very stable, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a power transmission length adjustable drive shaft assembly, including a first drive shaft and a second drive shaft. The first drive shaft is provided with a connector, and the connector has a through cavity. The second drive shaft is provided with an adjusting rod, and the adjusting rod has multiple straight toothed grooves along its length on its outer wall. The adjusting rod can extend and retract along the through cavity. The end of the connector is provided with multiple mounting parts, and the mounting parts are equipped with straight toothed claws that can move relative to each other towards the center. The straight toothed claws have multiple claw teeth facing inward. A positioning sleeve is also installed at the connection between the first drive shaft and the second drive shaft. The positioning sleeve presses the straight toothed claws into the corresponding straight toothed grooves to fix the first drive shaft and the second drive shaft.

[0007] Preferably, the outer wall of the connector is a threaded groove structure, the positioning sleeve is provided with an internal thread that matches the threaded groove of the connector, the mounting part is provided with a positioning groove, the rear end of the spur tooth claw is provided with a positioning part located in the positioning groove, the positioning part can only move along the depth direction of the positioning groove, and the rear inner wall of the positioning sleeve is provided with a closing clamping structure.

[0008] Preferably, the outer wall of the positioning sleeve is provided with a polygonal twisting part.

[0009] Preferably, the adjusting rod has a limiting protrusion in the gap between adjacent straight tooth grooves, and the through cavity has a corresponding limiting groove.

[0010] Preferably, the first drive shaft is provided with a second turning part, the second turning part is provided with an annular edge that fits over the positioning sleeve, the head end of the positioning sleeve is provided with grooves at both the top and bottom, a compression spring and a top post are fixed in the grooves, the inner wall of the annular edge is provided with an annular groove, and the annular edge is provided with two through holes that communicate with the annular groove.

[0011] Preferably, the width of the annular groove is greater than the diameter of the top column.

[0012] Preferably, both the spur tooth claw and the adjusting rod are made of high-hardness alloy material.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. It employs a clever, purely mechanical structural design, resulting in a simple overall structure that does not require motor drive, making it suitable for widespread adoption.

[0015] 2. The drive shaft can be flexibly adjusted in length. After the appropriate length is adjusted, the clamping structure will clamp the straight toothed claw. When the claw teeth of the straight toothed claw mesh with the straight tooth groove to achieve fixed positioning, the positioning sleeve will not loosen, which is very stable. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the connector and positioning sleeve of this utility model;

[0018] Figure 3 This is a schematic diagram of the second transmission shaft and adjusting rod structure of this utility model;

[0019] Figure 4 This is a front view schematic diagram of the adjusting rod structure of this utility model;

[0020] Figure 5 This is a rear view structural diagram of the connector of this utility model;

[0021] Figure 6 This is a front view schematic diagram of the positioning sleeve structure of this utility model.

[0022] In the diagram: 1. First drive shaft; 2. Second drive shaft; 3. Connector; 4. Through cavity; 5. Adjusting rod; 6. Straight tooth groove; 7. Mounting part; 8. Straight tooth claw; 9. Positioning sleeve; 10. Positioning part; 11. Clamping structure; 12. Tightening part; 13. Limiting protrusion; 14. Limiting groove; 15. Second tightening part; 16. Annular edge; 17. Clamping spring; 18. Top column; 19. Annular groove; 20. Through hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6This utility model provides a power transmission length adjustable drive shaft assembly, including a first drive shaft 1 and a second drive shaft 2. The first drive shaft 1 is provided with a connector 3, and the connector 3 has a through cavity 4. The second drive shaft 2 is provided with an adjusting rod 5, which has multiple straight toothed grooves 6 along its length on its outer wall. The adjusting rod 5 can extend and retract along the through cavity 4. The end of the connector 3 is provided with multiple mounting portions 7, and the mounting portions 7 are equipped with straight toothed claws 8 that can move relative to the center. The straight toothed claws 8 have multiple claw teeth facing inward. The first drive shaft 1 and the second drive shaft 2 are connected... The second drive shaft 2 is also equipped with a positioning sleeve 9 at the connection point. The positioning sleeve 9 presses the straight toothed claw 8 into the corresponding straight toothed groove 6 to fix the first drive shaft 1 and the second drive shaft 2. During adjustment, the positioning sleeve 9 is rotated in the opposite direction on the connector 3 to loosen the pressure on the straight toothed claw 8. After the positioning sleeve 9 is completely disengaged from the connector 3, the straight toothed claw 8 loses its meshing positioning with the straight toothed groove 6. It can be adjusted by inserting the adjusting rod 5 into the through cavity 4. After adjusting to a suitable length, the positioning sleeve 9 is rotated. After it is in place, it will press the straight toothed claw 8, so that the claw teeth of the straight toothed claw 8 mesh with the straight toothed groove 6 to achieve a fixed position.

[0025] Specifically, the outer wall of the connector 3 is a threaded groove structure, the positioning sleeve 9 is provided with an internal thread that matches the threaded groove of the connector 3, the mounting part 7 is provided with a positioning groove, the rear end of the spur tooth 8 is provided with a positioning part 10 located in the positioning groove, the positioning part 10 can only move along the depth direction of the positioning groove, and the rear inner wall of the positioning sleeve 9 is provided with a closing clamping structure 11; in this embodiment, the movement on the connector 3 can be realized by screwing the positioning sleeve 9, and the spur tooth 8 can be clamped by the clamping structure 11.

[0026] Specifically, the outer wall of the positioning sleeve 9 is provided with a polygonal twisting part 12; in this embodiment, the positioning sleeve 9 can be easily twisted by the polygonal twisting part 12.

[0027] Specifically, the adjusting rod 5 is provided with a limiting protrusion 13 in the gap between adjacent straight tooth grooves 6, and the through cavity 4 is provided with a corresponding limiting groove 14; in this embodiment, the cooperation between the limiting protrusion 13 and the limiting groove 14 prevents the adjusting rod 5 from rotating in the through cavity 4, thereby improving the adjustment accuracy.

[0028] Specifically, the first drive shaft 1 is provided with a second turning part 15, and the second turning part 15 is provided with an annular edge 16 that fits over the positioning sleeve 9. The top and bottom ends of the positioning sleeve 9 are provided with grooves, and a compression spring 17 and a top post 18 are fixed in the grooves. The inner wall of the annular edge 16 is provided with an annular groove 19, and the annular edge 16 is provided with two through holes 20 that communicate with the annular groove 19. In this embodiment, after adjusting the appropriate length, the top post 18 is pressed and the positioning sleeve 9 is screwed. When the positioning post 18 enters the annular edge 16, it is released. After it is in place, the compression structure 11 will press the straight tooth claw 8. At the same time, after the positioning post 18 enters the annular groove 19, it is stuck in it under the pressure of the compression spring 17, so that when the claw teeth of the straight tooth claw 8 mesh with the straight tooth groove 6 to achieve a fixed position, the positioning sleeve 9 will not loosen.

[0029] Specifically, the width of the annular groove 19 is greater than the diameter of the top post 18; in this embodiment, it facilitates the entry of the top post 18 into the annular groove 19 in the event of unavoidable errors.

[0030] Specifically, both the spur tooth 8 and the adjusting rod 5 are made of high-hardness alloy material; in this embodiment, the spur tooth 8 and the adjusting rod 5 are durable, not easily deformed, more stable, and have higher adjustment accuracy.

[0031] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0032] Working principle: During adjustment, the top post 18 is pressed down through the through hole 20 by the external component, squeezing the compression spring 17. This causes the top post 18 to disengage from the annular groove 19 and enter the groove. Then, the positioning sleeve 9 is rotated in the opposite direction on the connector 3 by the screwing part 12. This causes the clamping structure 11 to release its clamping on the straight toothed claw 8. After the positioning sleeve 9 is completely disengaged from the connector 3, the straight toothed claw 8 loses its engagement with the straight toothed groove 6. The adjustment can be made by inserting the adjusting rod 5 into the through cavity 4. After adjusting to the appropriate length, the top post 18 is pressed down and the positioning sleeve 9 is rotated. The positioning post 18 is released when it enters the annular edge 16. After it is in place, the clamping structure 11 will clamp the straight toothed claw 8. At the same time, after the positioning post 18 enters the annular groove 19, it is locked in the groove by the pressure of the compression spring 17. This ensures that the claw teeth of the straight toothed claw 8 engage with the straight toothed groove 6 and are locked in place. The positioning sleeve 9 will not loosen.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power transmission length adjustable drive shaft assembly, comprising a first drive shaft (1) and a second drive shaft (2), characterized in that, The first drive shaft (1) is provided with a connector (3), and the connector (3) is provided with a through cavity (4). The second drive shaft (2) is provided with an adjusting rod (5). The adjusting rod (5) is provided with multiple straight tooth grooves (6) along the length direction on its outer wall. The adjusting rod (5) can be extended and retracted along the through cavity (4). The end of the connector (3) is provided with multiple mounting parts (7). The mounting parts (7) are equipped with straight toothed claws (8) that can move relative to each other towards the center. The straight toothed claws (8) are provided with multiple claw teeth facing inward. The first drive shaft (1) and the second drive shaft (2) are also provided with a positioning sleeve (9) at the connection point. The positioning sleeve (9) presses the straight toothed claws (8) into the corresponding straight tooth grooves (6) to fix the first drive shaft (1) and the second drive shaft (2).

2. The power transmission length adjustable drive shaft assembly according to claim 1, characterized in that, The outer wall of the connector (3) is a threaded groove structure. The positioning sleeve (9) is provided with an internal thread that matches the threaded groove of the connector (3). The mounting part (7) is provided with a positioning groove. The rear end of the straight toothed claw (8) is provided with a positioning part (10) located in the positioning groove. The positioning part (10) can only move along the depth direction of the positioning groove. The inner wall of the rear end of the positioning sleeve (9) is provided with a closing clamping structure (11).

3. The power transmission length adjustable drive shaft assembly according to claim 2, characterized in that, The outer wall of the positioning sleeve (9) is provided with a polygonal twisting part (12).

4. The power transmission length adjustable drive shaft assembly according to claim 1, characterized in that, The adjusting rod (5) has a limiting protrusion (13) in the gap between adjacent straight tooth grooves (6), and the through cavity (4) has a corresponding limiting groove (14).

5. The power transmission length adjustable drive shaft assembly according to claim 1, characterized in that, The first drive shaft (1) is provided with a second turning part (15), the second turning part (15) is provided with an annular edge (16) sleeved on the positioning sleeve (9), the head end of the positioning sleeve (9) is provided with grooves at both the top and bottom, a compression spring (17) and a top column (18) are fixed in the groove, the inner wall of the annular edge (16) is provided with an annular groove (19), and the annular edge (16) is provided with two through holes (20) that communicate with the annular groove (19).

6. The power transmission length adjustable drive shaft assembly according to claim 5, characterized in that, The width of the annular groove (19) is greater than the diameter of the top column (18).

7. The power transmission length adjustable drive shaft assembly according to claim 1, characterized in that, Both the straight toothed claw (8) and the adjusting rod (5) are made of high-hardness alloy material.

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