Transmission shaft with length convenient to adjust

Abstract

The utility model relates to the technical field of transmission shafts, in particular to a transmission shaft convenient for length adjustment, which comprises a driving shaft sleeve, an extension frame arranged in the driving shaft sleeve, a first threaded sleeve arranged at one end of the driving shaft sleeve and a second threaded sleeve arranged on the driving shaft sleeve, a spline shaft capable of being inserted into the driving shaft sleeve is fixedly arranged in the center of one end of the extension frame, and the spline shaft can move in the center axis direction of the driving shaft sleeve; a plurality of spline grooves capable of being matched with the spline shaft are formed in the inner wall of the driving shaft sleeve in the center axis direction of the driving shaft sleeve. First external threads are formed outside one end of the driving shaft sleeve, and a plurality of receding grooves are formed in one end of the driving shaft sleeve at equal intervals around the center axis of the driving shaft sleeve; a first threaded sleeve is installed outside one end of the driving shaft sleeve and is in threaded fit with the second threaded sleeve. The overall length of the transmission shaft can be adjusted. The problem that a transmission shaft cannot be adjusted according to actual use requirements is solved.

Description

Technical Field

[0001] This utility model relates to the field of transmission shaft technology, specifically to a transmission shaft whose length is easy to adjust. Background Technology

[0002] A driveshaft is a core component in a mechanical transmission system, connecting the power source and the actuators. It primarily transmits rotational motion and torque. Its structure is typically made of high-strength metal tubing, with universal joints or couplings at both ends to accommodate angular and axial displacements, ensuring smooth power transmission. Driveshafts are widely used in automobiles, construction machinery, ships, and industrial equipment; for example, in automobiles, the drive axle transmits engine power to the wheels. High-quality driveshafts possess high torsional strength, good wear resistance, and precise dynamic balance, effectively reducing vibration and noise. Regular maintenance (such as lubrication and checking universal joint wear) can extend their service life and ensure the efficient and stable operation of the transmission system.

[0003] Chinese patent announcement CN209294276U discloses a drive shaft, including a shaft tube and universal joints connected to both ends of the shaft tube. The shaft tube has elastic protrusions fixed at both ends, and a sliding groove is provided on the opposite surface of the universal joint, with the axis of the sliding groove forming an angle with the axis of the universal joint. A limiting hole with a rhomboid cross-section is opened on the sidewall of the sliding groove that contacts the elastic protrusion. The end surface of the elastic protrusion fits into the limiting hole, and the diameter of the limiting hole gradually increases from the universal joint towards the shaft tube. T-shaped blocks are also fixed at both ends of the shaft tube, and T-shaped grooves that engage with the T-shaped blocks are also opened on the sliding groove. The purpose of this invention is to solve the problem that the shaft tube is prone to impact with the ground during disassembly.

[0004] The aforementioned patent documents contain a fixed length for the drive shaft, which makes it impossible to adjust the overall length of the drive shaft according to actual usage requirements, resulting in inconvenience. Therefore, a drive shaft with an adjustable length is proposed. Summary of the Invention

[0005] To address the aforementioned problems, a drive shaft with easily adjustable length is provided. By pulling the extension bracket, the extension bracket drives the splined shaft to move along the central axis of the drive sleeve. This allows for adjustment of the overall length of the drive shaft, solving the problem that the drive shaft could not be adjusted according to actual usage requirements.

[0006] To address the problems of the prior art, this application provides a drive shaft with adjustable length, including a drive bushing, an extension frame disposed inside the drive bushing, a first threaded sleeve disposed at one end of the drive bushing, and a second threaded sleeve disposed on the drive bushing. A splined shaft that can be inserted into the drive bushing is fixedly disposed at the center of one end of the extension frame, and the splined shaft can move along the central axis of the drive bushing.

[0007] The inner wall of the drive bushing has several spline grooves that can be adapted to the spline shaft along its central axis.

[0008] The drive bushing has a first external thread on one end, and a number of clearance grooves are equidistantly provided on one end of the drive bushing around its central axis.

[0009] A first threaded sleeve is installed on the outside of one end of the drive shaft sleeve, and the first threaded sleeve and the second threaded sleeve are threadedly engaged.

[0010] As a technical solution of this application, a boss is provided at one end of the first threaded sleeve, and a groove is provided on the outer circumferential surface of one end of the boss.

[0011] One end of the second threaded sleeve is rotatably mounted with a rotating seat, and one end of the rotating seat is fixed with a plug rod that can be adapted to the slot.

[0012] As one technical solution of this application, a second external thread is provided on the outer wall of the drive bushing near the side of the first external thread;

[0013] The second threaded sleeve is installed outside the drive shaft sleeve, and the second threaded sleeve is threadedly engaged with the second external thread.

[0014] As one technical solution of this application, a fixing frame is fixed at the end of the drive shaft sleeve away from the first external thread, and limit sleeves are symmetrically fixed on both sides of the fixing frame.

[0015] The extension frame is symmetrically fixed with limiting rods that can be inserted into the limiting sleeve near the side of the spline shaft.

[0016] As one technical solution of this application, the first threaded sleeve is provided with a first clamping part on its outside to facilitate its rotation.

[0017] As one technical solution of this application, the second threaded sleeve is provided with a second clamping part on its outside to facilitate its rotation.

[0018] The advantages of this utility model compared to the prior art are:

[0019] 1. This application utilizes an extension bracket to move the splined shaft along the central axis of the drive shaft sleeve. This allows for adjustment of the overall length of the drive shaft, solving the problem of the drive shaft being unable to be adjusted according to actual usage requirements.

[0020] 2. This application utilizes a groove formed on the outer circumferential surface of the boss at one end of the first threaded sleeve. When the second threaded sleeve drives the rotating seat close to the boss, the fixed rod on the rotating seat can be inserted into the groove, allowing the rod and the groove to cooperate in limiting the first threaded sleeve, effectively preventing it from loosening during vibration. This ensures the stability of the first threaded sleeve, as loosening of the first threaded sleeve would cause the extension frame to detach from the inside of the drive shaft sleeve. Attached Figure Description

[0021] Figure 1 This is a three-dimensional diagram of a drive shaft whose length is easy to adjust.

[0022] Figure 2 This is a schematic diagram of the external structure of the drive bushing in a drive shaft with adjustable length.

[0023] Figure 3 This is a three-dimensional view of the drive shaft sleeve in a drive shaft with adjustable length.

[0024] Figure 4 This is a three-dimensional view of an extension bracket in a drive shaft that allows for easy length adjustment.

[0025] Figure 5 This is an exploded view of the second threaded sleeve in a drive shaft with adjustable length.

[0026] Figure 6 This is a cross-sectional view of a drive shaft whose length is easy to adjust.

[0027] Figure 7 yes Figure 6 A magnified structural diagram at point A in the diagram.

[0028] Figure 8 This is a partially enlarged structural diagram of the drive bushing in a transmission shaft with adjustable length.

[0029] The numbers in the diagram are as follows: 1. Drive shaft sleeve; 11. First external thread; 12. Relief groove; 121. Spline groove; 13. Second external thread; 2. First threaded sleeve; 21. Boss; 22. Slot; 23. First clamping part; 3. Extension frame; 31. Spline shaft; 32. Limiting rod; 4. Fixing frame; 41. Limiting sleeve; 5. Second threaded sleeve; 51. Rotary seat; 52. Insert rod; 53. Second clamping part. Detailed Implementation

[0030] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0031] See Figures 1-8As shown, a drive shaft with adjustable length includes a drive sleeve 1, an extension frame 3 disposed inside the drive sleeve 1, a first threaded sleeve 2 disposed at one end of the drive sleeve 1, and a second threaded sleeve 5 disposed on the drive sleeve 1. A splined shaft 31 that can be inserted into the drive sleeve 1 is fixedly disposed at the center of one end of the extension frame 3. The splined shaft 31 can move along the central axis of the drive sleeve 1.

[0032] The inner wall of the drive shaft sleeve 1 has several spline grooves 121 that can be adapted to the spline shaft 31 along its central axis.

[0033] The drive bushing 1 has a first external thread 11 on the outside of one end, and a number of clearance grooves 12 are equally spaced around its central axis at one end of the drive bushing 1.

[0034] A first threaded sleeve 2 is installed on the outside of one end of the drive shaft sleeve 1, and the first threaded sleeve 2 is threadedly engaged with the second threaded sleeve 5.

[0035] When adjusting the length of the drive shaft, the extension frame 3 is pulled, causing it to move the splined shaft 31 along the central axis of the drive sleeve 1. This allows for adjustment of the overall length of the drive shaft. After adjustment, the first threaded sleeve 2 is rotated, bringing it closer to the extension frame 3. The inner ring of the first threaded sleeve 2 engages with the first external thread 11, gradually tightening the drive sleeve 1, thus clamping it onto the outside of the splined shaft 31 and fixing it in place. Simultaneously, the spline groove 121 on the inner wall of the drive sleeve 1 engages with the outside of the second external thread 13. This engagement between the spline groove 121 and the second external thread 13 ensures proper contact between the spline groove 121 and the splined shaft 31, preventing axial rotation and ensuring stability. This solves the problem of the drive shaft being unable to be adjusted according to actual usage requirements.

[0036] See Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, a boss 21 is provided at one end of the first threaded sleeve 2, and a groove 22 is provided on the outer circumferential surface of one end of the boss 21.

[0037] One end of the second threaded sleeve 5 is rotatably mounted with a rotating seat 51, and one end of the rotating seat 51 is fixed with a plug rod 52 that can be adapted to the slot 22.

[0038] To prevent the first threaded sleeve 2 from loosening under vibration, a groove 22 is provided on the outer circumference of the boss 21 at one end of the first threaded sleeve 2. When the second threaded sleeve 5 drives the rotating seat 51 close to the boss 21, the insert rod 52 fixed on the rotating seat 51 can be inserted into the groove 22, so that the insert rod 52 and the groove 22 cooperate to limit the first threaded sleeve 2, effectively preventing the first threaded sleeve 2 from loosening under vibration. This ensures the stability of the first threaded sleeve 2, as loosening of the first threaded sleeve 2 would cause the extension frame 3 to fall out of the drive shaft sleeve 1.

[0039] See Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, a second external thread 13 is provided on the outer wall of the drive bushing 1 near the side of the first external thread 11;

[0040] The second threaded sleeve 5 is installed outside the drive shaft sleeve 1, and the second threaded sleeve 5 is threadedly engaged with the second external thread 13.

[0041] By installing the second threaded sleeve 5 on the drive sleeve 1, the second threaded sleeve 5 is threadedly engaged with the second external thread 13. When the second threaded sleeve 5 rotates, it can move along the central axis of the drive sleeve 1 through the threaded engagement with the second external thread 13.

[0042] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, a fixing bracket 4 is fixed at the end of the drive shaft sleeve 1 away from the first external thread 11, and limit sleeves 41 are symmetrically fixed on both sides of the fixing bracket 4.

[0043] The extension bracket 3 is symmetrically fixed with a limiting rod 32 that can be inserted into the limiting sleeve 41 near the side of the spline shaft 31.

[0044] To ensure the stability of the extension frame 3, limiting rods 32 are symmetrically fixed on one side of the extension frame 3, and then the limiting rods 32 are inserted into the limiting sleeve 41. When the extension frame 3 moves, the extension frame 3 can drive the limiting rods 32 to move along the central axis of the limiting sleeve 41, thereby ensuring the stability of the extension frame 3 during movement. At the same time, the cooperation between the limiting rods 32 and the limiting sleeve 41 can also increase the overall strength of the transmission shaft.

[0045] See Figure 5 As shown, the first threaded sleeve 2 has a first clamping part 23 on its outside for easy control of its rotation.

[0046] To facilitate the rotation of the first threaded sleeve 2, a first clamping part 23 is provided on the outside of the first threaded sleeve 2 near the boss 21. When the first clamping part 23 needs to be rotated, a tool is clamped on the outside of the first clamping part 23. Then, the tool drives the first clamping part 23 to rotate around the central axis of the first threaded sleeve 2, making the rotation of the first threaded sleeve 2 more convenient.

[0047] See Figure 5 As shown, the second threaded sleeve 5 is provided with a second clamping part 53 on the outside to facilitate its rotation.

[0048] To facilitate the rotation of the second threaded sleeve 5, a second clamping part 53 is provided on the outer circumference of the second threaded sleeve 5. When the second threaded sleeve 5 needs to be rotated, the tool is clamped on the second clamping part 53, and then the tool drives the second clamping part 53 to rotate around the central axis of the second threaded sleeve 5, making the rotation of the second threaded sleeve 5 easier.

[0049] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A drive shaft with adjustable length, comprising a driving sleeve (1), an extension frame (3) arranged inside the driving sleeve (1), a first threaded sleeve (2) arranged at one end of the driving sleeve (1), and a second threaded sleeve (5) arranged on the driving sleeve (1), characterized in that, The center of one end of the extension frame (3) is fixedly provided with a spline shaft (31) capable of being inserted into the inside of the driving shaft sleeve (1), and the spline shaft (31) can move along the central axis direction of the driving shaft sleeve (1); A plurality of spline grooves (121) capable of adapting to the spline shaft (31) are formed on the inner wall of the driving shaft sleeve (1) along the central axis direction thereof; A first external thread (11) is formed on the outside of one end of the driving shaft sleeve (1), and a plurality of accommodation grooves (12) are equidistantly formed around the central axis of the one end of the driving shaft sleeve (1); The first threaded sleeve (2) is mounted on the outside of one end of the driving shaft sleeve (1), and the first threaded sleeve (2) is threadedly matched with the second threaded sleeve (5).

2. A length-adjustable drive shaft as defined in claim 1, wherein, One end of the first threaded sleeve (2) is provided with a boss (21), and a clamping groove (22) is formed on the outer circumferential surface of one end of the boss (21); One end of the second threaded sleeve (5) is rotatably mounted with a rotating seat (51), and one end of the rotating seat (51) is fixedly provided with an insertion rod (52) capable of adapting to the clamping groove (22).

3. A length-adjustable drive shaft as defined in claim 1, wherein, A second external thread (13) is formed on the outer wall of the driving shaft sleeve (1) near the side of the first external thread (11); The second threaded sleeve (5) is mounted on the outside of the driving shaft sleeve (1), and the second threaded sleeve (5) is threadedly matched with the second external thread (13).

4. A length-adjustable drive shaft as defined in claim 1, wherein, One end of the driving shaft sleeve (1) away from the first external thread (11) is fixedly provided with a fixing frame (4), and the fixing frame (4) is symmetrically fixed with a limiting sleeve (41) on both sides thereof; The extension frame (3) is symmetrically fixed with a limiting rod (32) capable of being inserted into the inside of the limiting sleeve (41) near the side of the spline shaft (31).

5. A length-adjustable drive shaft as defined in claim 1, wherein, The outside of the first threaded sleeve (2) is provided with a first clamping portion (23) facilitating the rotation thereof.

6. A length-adjustable drive shaft as defined in claim 1, wherein, The outside of the second threaded sleeve (5) is provided with a second clamping portion (53) facilitating the rotation thereof.

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