Transmission shaft with adjustable length

Abstract

The length-adjustable transmission shaft comprises an outer pipe, a connecting shaft is fixedly installed on the surface of the outer pipe, and an inner rod is arranged in the outer pipe in a sliding mode; the device further comprises a clamping assembly which is arranged in the inner rod, when the clamping assembly works, the inner rod and the outer pipe are clamped after the lengths of the inner rod and the outer pipe are changed, a worker can conveniently and rapidly adjust the overall length of the device, the overall application range of the device is expanded, and limitation is reduced. According to the length-adjustable transmission shaft, at the beginning, a clamping block is located in a clamping groove, when the overall length of the device needs to be changed, a stand column is pressed, the stand column drives a fixing block to descend, a long pin loses pushing force at the moment, then the clamping block loses pushing force of the long pin, and at the moment, the clamping block moves towards the outer side of the clamping groove under the action of a second spring and a sliding block; after the tail end of the clamping block moves out of the clamping groove, the inner rod and the outer pipe are not in a clamped state, at the moment, the outer pipe can be pulled, and the overall length of the device can be controlled according to the scale marks.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission shafts, and specifically relates to a transmission shaft with adjustable length. Background Technique

[0002] The transmission shaft is mainly used in various vehicles such as oil tank trucks, sprinkler trucks, and fire trucks. Its main function is to cooperate with the gearbox and drive axle to transmit the power of the engine to the wheels, so that the wheels generate driving force;

[0003] For example, a sound-absorbing automotive transmission shaft with the publication number of CN2201287Y includes a main transmission shaft with universal joints, where cross-axis universal joints are welded at both ends, and one end of the universal joint is hinged with a spline sliding fork that can directly form a sliding pair with the output shaft of the transmission. It is easy to process, has a low manufacturing cost, good sound-absorbing effect, can reduce noise, and improve work reliability and service life;

[0004] During the assembly process of the transmission shaft, when facing vehicles of different sizes, transmission shafts of different sizes are required. However, in the process of using the device in the above application, it is not convenient to quickly adjust the overall length of the device, resulting in a small overall use range of the device and great limitations in use.

[0005] In view of the above problems, it is urgent to innovate and design on the basis of the original transmission shaft. Content of the Utility Model

[0006] The purpose of the utility model is to provide a transmission shaft with adjustable length, so as to solve the problem that in the process of use, it is not convenient to quickly adjust the overall length of the device, resulting in a small overall use range of the device and great limitations in use as mentioned in the above background technique.

[0007] To achieve the above purpose, the utility model provides the following technical solution: A transmission shaft with adjustable length includes an outer tube. A connecting shaft is fixedly installed on the surface of the outer tube, and an inner rod is slidably arranged inside the outer tube. A connecting block is fixedly installed on the surface of the inner rod, and the inner rods are symmetrically distributed about the center of the connecting block;

[0008] A transmission shaft with adjustable length further includes:

[0009] A long pin, the long pin is slidably arranged inside the inner rod, the surface of the long pin fits with the inner wall of the inner rod, and a scale indication is engraved on the surface of the inner rod;

[0010] A clamping component, which is arranged inside the inner rod. When the clamping component works, it clamps after the lengths of the inner rod and the outer tube are changed, facilitating the staff to quickly adjust the overall length of the device, expanding the overall applicable range of the device and reducing the limitations.

[0011] Preferably, a clamping groove is formed inside the outer tube, and the clamping grooves are evenly distributed inside the outer tube.

[0012] Preferably, the engaging component includes a clamping block slidably disposed inside the inner rod. Initially, the clamping block is located inside the clamping groove. The end of the clamping block is inclined. A slider is fixedly installed on the side surface of the clamping block. Initially, the clamping block is located inside the clamping groove. At this time, the inner rod and the outer tube are in an engaged state, and thus the inner rod and the outer tube will not slide, that is, the overall length of the device is fixed.

[0013] Preferably, the end of the clamping block is in contact with the end of the long pin. Both the left and right sides of the long pin are inclined. A column is slidably disposed inside the connecting block. A fixing block is fixedly installed on the surface of the column. When it is necessary to change the overall length of the device, press the column. The column drives the fixing block to descend. At this time, the long pin loses the driving force of the fixing block, and thus the clamping block loses the thrust of the long pin.

[0014] Preferably, the fixing blocks are symmetrically distributed about the center of the column, and the long pins correspond to the fixing blocks one by one. The other side of the long pin is in contact with the surface of the fixing block, and the surface of the fixing block is inclined.

[0015] Preferably, a first spring for elastic reset is fixedly installed on the lower surface of the fixing block. The other side of the first spring is fixedly connected to the inner wall of the connecting block. A limiting block corresponding to the long pin one by one is fixedly installed on the inner wall of the connecting block. After the clamping block loses the driving force of the long pin, the clamping block moves outward of the clamping groove under the action of the second spring and the slider. When the end of the clamping block moves out of the clamping groove, the inner rod and the outer tube are not in an engaged state. At this time, the outer tube can be pulled, and the overall length of the device can be controlled according to the scale mark.

[0016] Preferably, a sliding groove corresponding to the slider is formed inside the inner rod. A second spring for elastic reset is fixedly installed on the surface of the slider. The other side of the second spring is fixedly connected to the inner wall of the inner rod. The second spring is initially in a compressed state. When pressing the column, the fixing block will squeeze the first spring. After determining the overall length of the device, release the column. At this time, the column and the fixing block rise under the action of the first spring. Then the fixing block will push the long pin again. The long pin will move toward the side of the outer tube. At this time, the long pin will push the clamping block again, causing the clamping block to rise and the clamping block to enter the corresponding clamping groove again. At this time, the inner rod and the outer tube are in an engaged state again, which is convenient for the normal use of the overall device. At this time, the second spring is in a compressed state again, which is convenient for the next use. During the movement of the clamping block, the slider and the sliding groove limit the movement distance of the clamping block, ensuring stability.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: The length-adjustable transmission shaft adopts a novel structural design, and the specific content is as follows:

[0018] (1) For the length-adjustable transmission shaft, initially, the clamping block is located inside the card slot. When it is necessary to change the overall length of the device, press the column, and the column drives the fixed block to descend. At this time, the long pin loses the driving force, and then the clamping block loses the thrust of the long pin. At this time, under the action of the second spring and the slider, the clamping block moves outward to the outside of the card slot. When the end of the clamping block moves out of the card slot, the inner rod and the outer tube are not in a clamped state. At this time, the outer tube can be pulled, and the overall length of the device can be controlled according to the scale mark;

[0019] (2) For the length-adjustable transmission shaft, when pressing the column, the fixed block will squeeze the first spring. After determining the overall length of the device, release the column. At this time, the column and the fixed block rise under the action of the first spring. Then the fixed block will push the long pin again, and the long pin will move toward the side of the outer tube. At this time, the long pin will push the clamping block again, causing the clamping block to rise and making the clamping block enter the corresponding card slot again. At this time, the inner rod and the outer tube are in a clamped state again, which is convenient for the normal use of the overall device. Description of the Drawings

[0020] Figure 1 is the front cross-sectional structural schematic diagram of the present utility model;

[0021] Figure 2 is the structural schematic diagram of the connection between the connecting block and the inner rod of the present utility model;

[0022] Figure 3 is the present utility model Figure 2 the enlarged structural schematic diagram at A in;

[0023] Figure 4 is the present utility model Figure 1 the enlarged structural schematic diagram at B in;

[0024] Figure 5 is the partial front cross-sectional structural schematic diagram of the working state of the inner rod of the present utility model;

[0025] Figure 6 is the front view structural schematic diagram of the inner rod of the present utility model.

[0026] In the figure: 1. Outer tube; 2. Connecting shaft; 3. Connecting block; 4. Column; 5. Inner rod; 6. Fixed block; 7. First spring; 8. Long pin; 9. Limit block; 10. Card slot; 11. Clamping block; 12. Slider; 13. Second spring; 14. Chute. Detailed Embodiment

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] Please refer to Figures 1 - 6 , the present utility model provides a technical solution: a drive shaft with adjustable length, including an outer tube 1, a connecting shaft 2 is fixedly installed on the surface of the outer tube 1, and an inner rod 5 is slidably arranged inside the outer tube 1. A connecting block 3 is fixedly installed on the surface of the inner rod 5, and the inner rods 5 are symmetrically distributed about the center of the connecting block 3;

[0029] A drive shaft with adjustable length further includes:

[0030] A long pin 8, the long pin 8 is slidably arranged inside the inner rod 5, and the surface of the long pin 8 is in contact with the inner wall of the inner rod 5. A scale indication is engraved on the surface of the inner rod 5. A clamping component is arranged inside the inner rod 5. When the clamping component works, it clamps after the lengths of the inner rod 5 and the outer tube 1 are changed, which is convenient for the staff to quickly adjust the overall length of the device, expands the overall applicable range of the device, and reduces the limitations.

[0031] A clamping groove 10 is opened inside the outer tube 1, and the clamping grooves 10 are equally spaced inside the outer tube 1. The clamping component includes a clamping block 11 slidably arranged inside the inner rod 5. The clamping block 11 is initially located inside the clamping groove 10. The end of the clamping block 11 is inclined, and a slider 12 is fixedly installed on the side of the clamping block 11.

[0032] Initially, the clamping block 11 is located inside the clamping groove 10. When it is necessary to change the overall length of the device, press the column 4. The column 4 drives the fixed block 6 (at this time, the first spring 7 is compressed) to descend. At this time, the long pin 8 loses the driving force of the fixed block 6. Furthermore, the clamping block 11 loses the thrust of the long pin 8. At this time, the clamping block 11 moves outward to the outside of the clamping groove 10 under the action of the second spring 13 and the slider 12. When the end of the clamping block 11 moves out of the clamping groove 10, the inner rod 5 and the outer tube 1 are not in a clamped state. At this time, the outer tube 1 can be pulled, and the overall length of the device can be controlled according to the scale indication on the surface of the inner rod 5.

[0033] The end of the clamping block 11 is in contact with the end of the long pin 8. Both the left and right sides of the long pin 8 are inclined. A column 4 is slidably arranged inside the connecting block 3. A fixed block 6 is fixedly installed on the surface of the column 4. The fixed blocks 6 are symmetrically distributed about the center of the column 4. The long pins 8 correspond to the fixed blocks 6 one by one. The other side of the long pin 8 is in contact with the surface of the fixed block 6, and the surface of the fixed block 6 is inclined.

[0034] A first spring 7 for elastic reset is fixedly installed on the lower surface of the fixed block 6, and the other side of the first spring 7 is fixedly connected to the inner wall of the connecting block 3. A limiting block 9 corresponding to the long pin 8 is fixedly installed on the inner wall of the connecting block 3.

[0035] A chute 14 corresponding to the slider 12 is provided inside the inner rod 5. A second spring 13 for elastic reset is fixedly installed on the surface of the slider 12, and the other side of the second spring 13 is fixedly connected to the inner wall of the inner rod 5. The second spring 13 is in a compressed state initially.

[0036] After determining the overall length of the device, the column 4 is released. At this time, the column 4 and the fixed block 6 rise under the action of the first spring 7. Further, the fixed block 6 will push the long pin 8 again, and the long pin 8 will move towards the side of the outer tube 1. At this time, the long pin 8 will push the clamping block 11 again, causing the clamping block 11 to rise and the clamping block 11 to enter the corresponding card slot 10 again. At this time, the inner rod 5 and the outer tube 1 are in a clamped state again, facilitating the normal use of the overall device. At this time, the second spring 13 is in a squeezed state again, facilitating the next use. During the movement of the clamping block 11, the slider 12 and the chute 14 limit the moving distance of the clamping block 11, ensuring stability.

[0037] The above is the working process of the entire device, and the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission shaft with adjustable length, comprising an outer tube (1), a connecting shaft (2) being fixedly mounted on the surface of the outer tube (1), an inner rod (5) being slidably arranged inside the outer tube (1), a connecting block (3) being fixedly mounted on the surface of the inner rod (5), and the inner rod (5) being symmetrically distributed about the center of the connecting block (3); It is characterized in that Also includes: A long pin (8), the long pin (8) being slidably arranged inside the inner rod (5), the surface of the long pin (8) being in contact with the inner wall of the inner rod (5), and the surface of the inner rod (5) being engraved with scale marks; The locking assembly is arranged inside the inner rod (5). When the locking assembly is in operation, the inner rod (5) and the outer tube (1) are locked together after the lengths are changed, so that the staff can quickly adjust the length of the entire device, thereby expanding the application range of the entire device and reducing limitations.

2. A transmission shaft with adjustable length according to claim 1, characterized in that: The outer tube (1) is provided with clamping grooves (10) inside, and the clamping grooves (10) are distributed at equal intervals inside the outer tube (1).

3. A transmission shaft with adjustable length according to claim 2, characterized in that: The engaging assembly comprises a clamping block (11) slidably arranged inside the inner rod (5), and the clamping block (11) is initially located inside the clamping slot (10), and the end of the clamping block (11) is inclined, and a sliding block (12) is fixedly mounted on the side of the clamping block (11).

4. A transmission shaft with adjustable length according to claim 3, characterized in that: The end of the clamping block (11) fits with the end of the long pin (8), and the left and right sides of the long pin (8) are both inclined. A column (4) is slidably arranged inside the connecting block (3), and a fixing block (6) is fixedly mounted on the surface of the column (4).

5. A transmission shaft with adjustable length according to claim 4, characterized in that: The fixing blocks (6) are symmetrically distributed about the center of the column (4), and the long pins (8) correspond to the fixing blocks (6) one by one, and the other side of the long pins (8) is in contact with the surface of the fixing blocks (6), and the surface of the fixing blocks (6) is inclined.

6. A transmission shaft with adjustable length according to claim 5, characterized in that: A first spring (7) having an elastic reset function is fixedly mounted on the lower surface of the fixed block (6), and the other side of the first spring (7) is fixedly connected to the inner wall of the connecting block (3), and a limit block (9) corresponding to the long pin (8) is fixedly mounted on the inner wall of the connecting block (3).

7. The length-adjustable transmission shaft according to claim 3, characterized in that: The inner rod (5) is provided with a slide groove (14) corresponding to the slider (12), and a second spring (13) having an elastic return function is fixedly mounted on the surface of the slider (12), and the other side of the second spring (13) is fixedly connected to the inner wall of the inner rod (5), and the second spring (13) is initially in a compressed state.

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