High-strength telescopic drive shaft
By using the design of the inner cylinder and rubber ring, the problem of high maintenance costs caused by wear clearance between the spline shaft and spline groove is solved, thus achieving stable transmission of the drive shaft and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NING BO YOU SHI JIE CHUAN DONG JIAN YOU XIAN GONG SI
- Filing Date
- 2025-06-20
- Publication Date
- 2026-06-12
AI Technical Summary
When high-frequency friction causes a clearance in the spline shaft and spline groove of the existing high-strength telescopic drive shaft, the spline shaft and spline groove need to be replaced to ensure stable transmission, resulting in high maintenance costs and time consumption.
The system employs an inner cylinder, rectangular hole, connecting column, trapezoidal block, threaded column, sliding groove, sliding column, trapezoidal groove, first retaining ring, nut and second retaining ring. By rotating the nut, the distance between the connecting column and the sliding column is increased to compensate for wear gaps, and the friction between the rubber ring and the pressing block prevents loosening.
It achieves stable transmission of the drive shaft even with wear gaps, reduces maintenance costs, and prevents the connection from loosening during vibration.
Smart Images
Figure CN224352263U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of telescopic drive shafts, specifically relating to a high-strength telescopic drive shaft. Background Technology
[0002] Currently, high-strength telescopic drive shafts are widely used in automotive transmission systems, construction machinery, and industrial equipment. Their core structure mainly consists of two shafts, a splined shaft, and a splined groove. The synchronous rotation of the two shafts is achieved through the meshing of the splined shaft and the splined groove. At the same time, the sliding characteristics of the splined shaft within the splined groove allow the drive shaft to adaptively adjust its length to meet the transmission requirements under different working conditions.
[0003] However, when the spline shaft and spline groove on the drive shaft develop a clearance due to high-frequency friction, a new spline shaft and spline groove must be replaced to ensure that the drive shaft continues to transmit power stably, which leads to high maintenance costs and time consumption for the drive shaft. Utility Model Content
[0004] The purpose of this invention is to provide a high-strength telescopic drive shaft, which solves the problem that when the spline shaft and spline groove on the drive shaft have a gap due to high-frequency friction, it is necessary to replace the spline shaft and spline groove to ensure that the drive shaft continues to transmit power stably, which leads to high maintenance costs and time consumption for the drive shaft.
[0005] The specific technical solution adopted by this utility model is as follows:
[0006] A high-strength telescopic drive shaft includes a first shaft body. An outer cylinder is fixedly connected to the left side of the first shaft body. A connecting groove is formed on the inner wall of the outer cylinder. An inner cylinder is provided inside the outer cylinder. A rectangular hole is formed inside the inner cylinder. Connecting posts are fitted to the inner walls of the rectangular hole and the connecting groove. A trapezoidal block is fixedly connected to the surface of the connecting post. A threaded post is fixedly connected to the inner wall of the inner cylinder. A second shaft body is fixedly connected to the left end of the threaded post. A sliding groove is formed on the surface of the threaded post. A sliding post is fitted to the inner wall of the sliding groove. A trapezoidal groove is formed on the surface of the sliding post. The inner wall of the trapezoidal groove is fitted to the surface of the trapezoidal block. A first retaining ring is sleeved on the surface of the threaded post. The inner wall of the first retaining ring is fixedly connected to the surface of the sliding post. A nut is fitted to the left side of the first retaining ring. The inner wall of the nut is threadedly connected to the surface of the threaded post. A second retaining ring is sleeved on the surface of the threaded post. The right side of the second retaining ring is fitted to the left side of the nut. The inner wall of the second retaining ring is fixedly connected to the surface of the sliding post.
[0007] The present invention is further configured such that the axes of the first shaft, the outer cylinder, the inner cylinder, the threaded column, and the second shaft are all on the same horizontal line, and the gap between the inner wall of the outer cylinder and the inner wall of the inner cylinder is 0.4 mm.
[0008] The present invention is further configured such that a groove is formed on the upper surface of the nut, a horizontal plate is fixedly connected to the upper surface of the nut, a semi-circular rubber column is bonded to the bottom of the horizontal plate, rubber rings are bonded to the surfaces of the first retaining ring and the second retaining ring, a pressing block is fitted to the upper surface of the rubber ring and the inner wall of the groove, an arc-shaped groove is formed on the upper surface of the pressing block, and the inner wall of the arc-shaped groove is fitted to the surface of the semi-circular rubber column.
[0009] The present invention is further configured such that the axis of the semi-circular rubber column coincides with the center of the arc groove, and the depth of the arc groove is less than the radius of the semi-circular rubber column.
[0010] The present invention is further configured such that a circular groove is provided on the right side of the threaded column, and a buffer rubber pad is adhered to the inner wall of the circular groove.
[0011] The present invention is further configured such that the center of the buffer rubber pad coincides with the axis of the threaded column, and the thickness of the buffer rubber pad is greater than the depth of the circular groove.
[0012] The technical effects achieved by this utility model are as follows:
[0013] This utility model's high-strength telescopic drive shaft, through the cooperation of an inner cylinder, rectangular hole, connecting column, trapezoidal block, threaded column, sliding groove, sliding column, trapezoidal groove, first retaining ring, nut, and second retaining ring, allows the distance between the connecting column and the sliding column to be increased by rotating the nut when a gap arises between the connecting column and the connecting groove due to wear. This compensates for the gap caused by wear, allowing the connecting block and the connecting groove to regain a stable fit, thus enabling the drive shaft to continue to transmit power stably and effectively reducing the maintenance cost of the drive shaft.
[0014] This utility model's high-strength telescopic drive shaft incorporates a nut, groove, cross plate, semi-circular rubber column, rubber ring, pressing block, and arc-shaped groove. When the pressing block is inserted into the groove and the semi-circular rubber column contacts the arc-shaped groove, the pressing block is secured within the groove through the interaction of the arc-shaped groove and the semi-circular rubber column. This pressing block presses against the surface of the rubber ring. At this time, the friction between the pressing block and the rubber ring prevents the nut from easily rotating when the drive shaft vibrates, thus preventing the connecting column and connecting groove from loosening due to vibration. Attached Figure Description
[0015] Figure 1 This is a three-dimensional schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a top view of the structure of this utility model;
[0017] Figure 3 yes Figure 2Sectional view at point AA;
[0018] Figure 4 yes Figure 3 Sectional view at point BB;
[0019] Figure 5 This is a left view of the outer cylinder in this utility model;
[0020] Figure 6 This is a front view of the inner cylinder in this utility model;
[0021] Figure 7 This is a right view of the threaded column in this utility model;
[0022] Figure 8 This is a front view of the sliding column, the first retaining ring, and the second retaining ring in this utility model;
[0023] Figure 9 This is a right view of the nut in this utility model;
[0024] Figure 10 This is a front view of the pressing block in this utility model.
[0025] The attached diagram lists the components represented by each number as follows:
[0026] 1. First shaft; 2. Outer cylinder; 3. Connecting groove; 4. Inner cylinder; 5. Rectangular hole; 6. Connecting post; 7. Trapezoidal block; 8. Threaded post; 9. Second shaft; 10. Sliding groove; 11. Sliding post; 12. Trapezoidal groove; 13. First retaining ring; 14. Nut; 15. Second retaining ring; 16. Groove; 17. Horizontal plate; 18. Semi-circular rubber post; 19. Rubber ring; 20. Pressing block; 21. Arc groove; 22. Circular groove; 23. Buffer rubber pad. Detailed Implementation
[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0029] like Figures 1 to 8As shown, a high-strength telescopic transmission shaft includes a first shaft body 1. An outer cylinder 2 is fixedly connected to the left side of the first shaft body 1. A connecting groove 3 is formed on the inner wall of the outer cylinder 2. An inner cylinder 4 is provided inside the outer cylinder 2. A rectangular hole 5 is formed inside the inner cylinder 4. Connecting posts 6 are fitted to both the inner wall of the rectangular hole 5 and the inner wall of the connecting groove 3. A trapezoidal block 7 is fixedly connected to the surface of the connecting post 6. A threaded post 8 is fixedly connected to the inner wall of the inner cylinder 4. A second shaft body 9 is fixedly connected to the left end of the threaded post 8. A sliding groove 10 is formed on the surface of the threaded post 8. A sliding post 11 is fitted to the inner wall of the sliding groove 10. A trapezoidal groove 12 is formed on the surface of the threaded column 8. The inner wall of the trapezoidal groove 12 is in contact with the surface of the trapezoidal block 7. A first retaining ring 13 is fitted on the surface of the threaded column 8. The inner wall of the first retaining ring 13 is fixedly connected to the surface of the sliding column 11. A nut 14 is fitted on the left side of the first retaining ring 13. The inner wall of the nut 14 is threadedly connected to the surface of the threaded column 8. A second retaining ring 15 is fitted on the surface of the threaded column 8. The right side of the second retaining ring 15 is in contact with the left side of the nut 14. The inner wall of the second retaining ring 15 is fixedly connected to the surface of the sliding column 11. A circular groove 22 is formed on the right side of the threaded column 8. A buffer rubber pad 23 is adhered to the inner wall of the circular groove 22.
[0030] Among them, the axes of the first shaft 1, outer cylinder 2, inner cylinder 4, threaded column 8 and second shaft 9 are all on the same horizontal line. The gap between the inner wall of the outer cylinder 2 and the inner wall of the inner cylinder 4 is 0.4mm. The center of the buffer rubber pad 23 coincides with the axis of the threaded column 8, and the thickness of the buffer rubber pad 23 is greater than the depth of the circular groove 22.
[0031] It should be noted that the inner cylinder 4 and the outer cylinder 2 rotate synchronously through the cooperation of the connecting groove 3 and the connecting column 6. Furthermore, since the inner cylinder 4 can slide horizontally within the outer cylinder 2, the length of the drive shaft can be adaptively adjusted. The connecting column 6 can be positioned through the rectangular hole 5. The sliding groove 10 allows the sliding column 11 to move only left and right. The cooperation of the first retaining ring 13 and the second retaining ring 15 allows the sliding column 11 to move together with the nut 14. When the user rotates the nut 14 to move the sliding column 11 to the right, the trapezoidal groove 12 and the left inclined surface of the trapezoidal block 7 allow for... By increasing the distance between the sliding column 11 and the connecting column 6, when a gap is generated between the connecting column 6 and the connecting groove 3 due to wear, the gap generated by wear can be compensated by increasing the distance between the connecting column 6 and the sliding column 11, so that the connecting block and the connecting groove 3 can regain a stable fit, thereby enabling the transmission shaft to continue to transmit power stably, and thus effectively reducing the maintenance cost of the transmission shaft. The buffer rubber pad 23 isolates the threaded column 8 from the first shaft body 1, and the elasticity of the buffer rubber pad 23 reduces the impact force between the threaded column 8 and the first shaft body 1 when the transmission shaft is contracted to its shortest length.
[0032] like Figures 1 to 10As shown, a groove 16 is provided on the upper surface of the nut 14, and a horizontal plate 17 is fixedly connected to the upper surface of the nut 14. A semi-circular rubber column 18 is bonded to the bottom of the horizontal plate 17. Rubber rings 19 are bonded to the surfaces of the first retaining ring 13 and the second retaining ring 15. A pressing block 20 is fitted to the upper surface of the rubber ring 19 and the inner wall of the groove 16. An arc groove 21 is provided on the upper surface of the pressing block 20, and the inner wall of the arc groove 21 is fitted to the surface of the semi-circular rubber column 18.
[0033] The axis of the semi-circular rubber column 18 coincides with the center of the arc groove 21, and the depth of the arc groove 21 is less than the radius of the semi-circular rubber column.
[0034] It should be noted that, since the semi-circular rubber column 18 can deform after being squeezed, the user can directly insert the pressing block 20 into the groove 16 or directly pull the pressing block 20 out of the groove 16. When the pressing block 20 is inserted into the groove 16 and the semi-circular rubber column 18 contacts the arc groove 21, the pressing block 20 can be stuck in the groove 16 through the cooperation of the arc groove 21 and the semi-circular rubber column 18, and the pressing block 20 presses the surface of the rubber ring 19. At this time, through the friction between the pressing block 20 and the rubber ring 19, the nut 14 is not easy to rotate when the drive shaft vibrates, so that the connecting column 6 and the connecting groove 3 are not easy to loosen due to vibration.
[0035] The working principle of this utility model is as follows: Through the cooperation of the connecting groove 3 and the connecting column 6, the inner cylinder 4 and the outer cylinder 2 rotate synchronously. Furthermore, since the inner cylinder 4 can slide horizontally within the outer cylinder 2, the length of the transmission shaft can be adaptively adjusted. When a gap is created between the connecting column 6 and the connecting groove 3 due to wear, the pressing block 20 is first pulled out of the groove 16. Then, by rotating the nut 14, the sliding column 11 moves to the right under the cooperation of the nut 14, the threaded column 8, the first retaining ring 13, and the second retaining ring 15. At this time, through the trapezoidal groove 12 and the left inclined surface of the trapezoidal block 7, the distance between the sliding column 11 and the connecting column 6 can be increased, thus compensating for wear. The resulting gap allows the connecting block and the connecting groove 3 to re-establish a stable fit, thus enabling the drive shaft to continue to transmit power stably. After the position of the sliding column 11 is adjusted, the pressing block 20 is inserted into the groove 16, and the semi-circular rubber column 18 contacts the arc groove 21. At this time, through the cooperation of the arc groove 21 and the semi-circular rubber column 18, the pressing block 20 can be locked in the groove 16, and the pressing block 20 presses the surface of the rubber ring 19. At the same time, through the friction between the pressing block 20 and the rubber ring 19, the nut 14 is not easy to rotate when the drive shaft vibrates, thus making it difficult for the connecting column 6 and the connecting groove 3 to loosen due to vibration.
[0036] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.
Claims
1. A high-strength telescopic drive shaft, characterized in that: The system includes a first shaft (1), an outer cylinder (2) fixedly connected to the left side of the first shaft (1), a connecting groove (3) provided on the inner wall of the outer cylinder (2), an inner cylinder (4) provided inside the outer cylinder (2), a rectangular hole (5) provided inside the inner cylinder (4), a connecting post (6) fitted to both the inner wall of the rectangular hole (5) and the inner wall of the connecting groove (3), a trapezoidal block (7) fixedly connected to the surface of the connecting post (6), a threaded post (8) fixedly connected to the inner wall of the inner cylinder (4), a second shaft (9) fixedly connected to the left end of the threaded post (8), a sliding groove (10) provided on the surface of the threaded post (8), and the inner wall of the sliding groove (10) fitted to the inner wall of the connecting post (9). A sliding column (11) is provided, and a trapezoidal groove (12) is opened on the surface of the sliding column (11). The inner wall of the trapezoidal groove (12) is in contact with the surface of the trapezoidal block (7). A first retaining ring (13) is sleeved on the surface of the threaded column (8). The inner wall of the first retaining ring (13) is fixedly connected to the surface of the sliding column (11). A nut (14) is attached to the left side of the first retaining ring (13). The inner wall of the nut (14) is threadedly connected to the surface of the threaded column (8). A second retaining ring (15) is sleeved on the surface of the threaded column (8). The right side of the second retaining ring (15) is in contact with the left side of the nut (14). The inner wall of the second retaining ring (15) is fixedly connected to the surface of the sliding column (11).
2. The high-strength telescopic transmission shaft according to claim 1, characterized in that: The axes of the first shaft (1), outer cylinder (2), inner cylinder (4), threaded column (8) and second shaft (9) are all on the same horizontal line, and the gap between the inner wall of the outer cylinder (2) and the inner wall of the inner cylinder (4) is 0.4 mm.
3. The high-strength telescopic transmission shaft according to claim 1, characterized in that: The nut (14) has a groove (16) on its upper surface. A horizontal plate (17) is fixedly connected to the upper surface of the nut (14). A semi-circular rubber column (18) is bonded to the bottom of the horizontal plate (17). Rubber rings (19) are bonded to the surfaces of the first retaining ring (13) and the second retaining ring (15). Pressing blocks (20) are fitted to the upper surface of the rubber ring (19) and the inner wall of the groove (16). An arc groove (21) is opened on the upper surface of the pressing block (20). The inner wall of the arc groove (21) is fitted to the surface of the semi-circular rubber column (18).
4. The high-strength telescopic transmission shaft according to claim 3, characterized in that: The axis of the semi-circular rubber column (18) coincides with the center of the arc groove (21), and the depth of the arc groove (21) is less than the radius of the semi-circular rubber column (18).
5. The high-strength telescopic transmission shaft according to claim 1, characterized in that: A circular groove (22) is provided on the right side of the threaded column (8), and a buffer rubber pad (23) is adhered to the inner wall of the circular groove (22).
6. The high-strength telescopic transmission shaft according to claim 5, characterized in that: The center of the buffer rubber pad (23) coincides with the axis of the threaded post (8), and the thickness of the buffer rubber pad (23) is greater than the depth of the circular groove (22).