Transmission shaft for vehicle

Abstract

The transmission shaft comprises a front axle in transmission connection with a driving device and a rear axle in transmission connection with the front axle and a rear axle of the vehicle, a supporting frame is arranged between the front axle and the rear axle, the supporting frame is fixed to a vehicle body of the vehicle to support the transmission shaft, and the front axle is provided with a driving section and a front axle pipe. One end of the driving section is connected with the driving device, the other end of the driving section is telescopically connected with the front axle tube, the rear axle comprises a driven section connected with a rear axle of the vehicle and a connecting section connected with the driven section, the transmission shaft further comprises a rotating structure arranged on the supporting frame and in transmission connection with the front axle tube, and the connecting section is in transmission connection with the rotating structure. And the rotating structure can transversely reciprocate relative to the rotating structure. The utility model provides a transmission shaft for a vehicle to solve the technical problems that a front axle of an existing transmission shaft cannot be adjusted in size, adaptability is poor, a rear axle is suspended, telescopic vibration is too large, transmission shaft parts are abraded, and the service life of the transmission shaft is shortened.

Description

Technical Field

[0001] This application belongs to the technical field of vehicles, and particularly relates to a drive shaft for vehicle use. Background Art

[0002] In the existing vehicle drive shaft system, one end of the drive shaft is connected to the transmission and the other end is connected to the front axle or rear axle of the vehicle to transmit the torque for vehicle forward movement. When the drive shaft is connected to the rear axle of the vehicle, the drive shaft is too long. To avoid deformation of the drive shaft under the influence of gravity and ensure stable transmission of torque by the drive shaft, it is necessary to set up a support frame on the vehicle chassis to support the drive shaft. The main reducer that is connected to the rear axle of the vehicle after the support frame provides power for the vehicle rear wheels is the rear axle, and the one that is connected to the vehicle transmission before the support frame is the front axle. The rear axle can be telescopically arranged. When the vehicle passes through a convex or uneven road section, the rear axle can telescopically adapt to stably provide power to the vehicle rear wheels. To facilitate stable transmission of the torque output by the vehicle engine, the front axle remains non-telescopic during vehicle operation. In the prior art, the front axle passes through the support frame and is connected to the rear axle through a reversing device. The front axle and the support frame reversing device maintain a fixed axial distance and do not move or telescopic along the vehicle axial direction. However, with the same wheelbase, fixed engine and rear axle main reducer height, if the size of the transmission is changed or the position of the transmission is adjusted, because the length of the front axle has been fixed, the existing drive shaft cannot be used. If the size of the transmission is changed or the position of the transmission is adjusted, then the drive shaft needs to be replaced. Even when the fixed positions of the engine or the support frame change, the drive shaft needs to be re-sized and a new drive shaft needs to be re-produced. During the vehicle design and production stages, to adapt to the adjustment and optimization of the transmission, engine, and support frame, it is necessary to prepare multiple size types of drive shafts and continuously produce new-sized drive shafts, increasing production costs, increasing the management difficulty of drive shaft drawings, and unable to optimize the production process.

[0003] The rear axle can adjust its telescopic length when the vehicle runs through a bumpy road section. The telescopic movement of the rear axle can avoid bending of the rear axle and ensure continuous transmission of torque to the rear wheels. However, during this process, the telescopic position of the rear axle is between the support frame and the rear axle, resulting in the rear axle being suspended and telescoping. This causes the rear axle to vibrate during telescoping, leading to overall resonance of the drive shaft, further resulting in a large overall noise of the vehicle, poor running comfort, and at the same time exacerbating the wear of the drive shaft components and reducing the service life of the drive shaft. Summary of the Utility Model

[0004] This application provides a drive shaft for vehicle use to solve the technical problems that the front axle of the existing drive shaft cannot be adjusted in size with poor adaptability, and the rear axle is suspended and telescoped with excessive vibration, resulting in wear of the drive shaft components and reduction of the service life of the drive shaft.

[0005] The technical solution adopted in this application is as follows:

[0006] A drive shaft for a vehicle, the drive shaft includes a front shaft drivingly connected to a driving device and a rear shaft drivingly connected to the front shaft and drivingly connected to the rear axle of the vehicle. A support frame is provided between the front shaft and the rear shaft, and the support frame is fixed to the vehicle body to support the drive shaft. The front shaft has a driving section and a front shaft tube. One end of the driving section is connected to the driving device, and the other end is telescopically connected to the front shaft tube. The rear shaft includes a driven section connected to the rear axle of the vehicle and a connecting section connected to the driven section. The drive shaft further includes a rotating structure provided on the support frame and drivingly connected to the front shaft tube, and the connecting section is drivingly connected to the rotating structure and can reciprocate laterally relative to the rotating structure.

[0007] A drive shaft for a vehicle in this application further includes the following additional technical features:

[0008] The rotating structure is provided with a transmission hole, and a guiding portion extending along the lateral reciprocating movement direction of the connecting section is provided in the transmission hole. The connecting section is provided with a cooperating portion cooperating with the guiding portion, and the cooperating portion moves along the guiding portion to realize the movement of the connecting section relative to the support frame.

[0009] The guiding portion has a cooperating hole, and a guiding groove extending along the lateral reciprocating movement direction of the connecting section is provided in the cooperating hole. The guiding grooves are circumferentially spaced along the cooperating hole. The cooperating portion is a guiding protrusion cooperating with the guiding groove.

[0010] The front shaft tube has a first extension section extending towards the rotating structure and connected to the rotating structure. The guiding portion has a cooperating hole, and the cooperating portion moves in the cooperating hole. The first extension section has a first transmission hole coaxially arranged with the cooperating hole, and the aperture of the first transmission hole is greater than or equal to the aperture of the cooperating hole.

[0011] A first guiding portion cooperating with the cooperating portion is provided in the first transmission hole so that the connecting section and the first extension section can be telescopically connected.

[0012] The support frame is provided with a protective member covering the connection position between the first extension section and the rotating structure.

[0013] The rotating structure is provided with a second extension section extending towards the rear shaft and protruding from the support frame; the rotating structure is provided with a transmission hole, and the transmission hole extends to the end face of the second extension section facing the rear shaft. A guiding portion extending along the lateral reciprocating movement direction of the connecting section is provided in the transmission hole. The connecting section is provided with a cooperating portion cooperating with the guiding portion, and the cooperating portion moves along the guiding portion to realize the movement of the connecting section relative to the support frame.

[0014] The guiding portion extends towards the rear shaft and protrudes from the second extension section.

[0015] The drive shaft is further provided with a protective member connected to the second extension section, and the protective member covers the guiding portion and the connecting section.

[0016] The connecting section includes a telescopic part that is drivingly connected to the rotating structure and a limiting part that connects to the rear axle and has a shaft diameter larger than that of the telescopic part. The rotating structure is provided with an abutting part that cooperates with the limiting part.

[0017] Due to the adoption of the above technical solutions, the beneficial effects achieved by this application are as follows:

[0018] 1. In this application, by setting the active section to be telescopically connected to the front axle tube, the length of the front axle can be adjusted. In a preferred embodiment, when the axial distance between the vehicle support frame and the driving device changes along the vehicle axis, the length of the front axle is adjusted to adapt to the changed vehicle, avoiding the need to replace the new drive shaft, improving the adaptability and flexibility of the drive shaft, reducing production costs, and improving production efficiency. At the same time, by setting the rotating structure to be drivingly connected to the front axle tube, the connecting section is drivingly connected to the rotating structure and can reciprocate laterally relative to the rotating structure. The support frame is used to limit the vibration amplitude during the telescopic process of the connecting section, reduce the vibration transmitted by the driven section, reduce the wear of the drive shaft components, and ensure the stable transmission of torque by the drive shaft. At the same time, the support frame can provide a stable supporting force for the connecting section, thereby improving the stability and reliability of the drive shaft, ensuring the stable transmission of torque by the drive shaft, and extending the service life of the drive shaft. The reciprocating movement of the connecting section relative to the rotating structure can ensure that when the distance between the vehicle rear axle and the support frame changes during vehicle driving, the drive shaft automatically adjusts its length to ensure the continuous transmission of vehicle power.

[0019] 2. As a preferred embodiment of this application, by setting a transmission hole in the rotating structure and a guiding part in the transmission hole, the connecting section moves relative to the support frame by the cooperating part moving along the guiding part. Especially during the telescopic process of the connecting section, the support frame can more directly cancel out the vibration generated by the connecting section. The cooperating part moves along the guiding part, improving the movement stability of the cooperating part, and further improving the telescopic stability of the connecting section. At the same time, setting the guiding part to cooperate with the cooperating part helps to disperse the load of the connecting section, provide a stable supporting force for the connecting section, reduce the local stress concentration of the drive shaft, thereby extending the service life of the drive shaft and improving the stability of the drive shaft.

[0020] 3. As a preferred embodiment of this application, by setting the guiding part to have a cooperating hole, a guiding groove extending along the lateral reciprocating movement direction of the connecting section is arranged in the cooperating hole. The cooperating part cooperates with the guiding groove with a guiding protrusion, and the guiding protrusion moves along the guiding groove, improving the movement stability of the connecting section. The guiding groove extends along the lateral reciprocating movement direction of the connecting section, which helps to improve the movement accuracy of the cooperating part and avoid deviation. At the same time, the contact area between the guiding groove and the guiding protrusion increases, which is more conducive to improving the movement stability of the connecting section and the reliability of torque transmission. The guiding grooves are arranged at intervals along the circumferential direction of the cooperating hole, further increasing the contact area between the guiding groove and the guiding protrusion, improving the supporting and guiding effect of the guiding groove on the guiding protrusion, and ensuring the movement stability of the cooperating part.

[0021] 4. As a preferred embodiment of the present application, by providing a first extension section, the first extension section has a first transmission hole coaxially arranged with the mating hole, and the diameter of the first transmission hole is greater than or equal to the diameter of the mating hole. The mating part can move along the mating hole into the first transmission hole, increasing the movable distance of the connecting section and expanding the range of scenarios that the vehicle can adapt to.

[0022] Furthermore, by providing a first guiding section in the first transmission hole to cooperate with the mating part, the connecting section and the first extension section are telescopically connected. At the same time, the first guiding section and the guiding section together guide the mating part, which helps improve the stability of the movement of the mating part, facilitates the distribution of the load on the connecting section, reduces the local stress concentration on the connecting section, thereby extending the service life of the transmission shaft and improving the stability of the transmission shaft. Moreover, adding the first guiding section helps maintain the coaxiality of the transmission shaft and reduces vibration and noise caused by axis offset.

[0023] In an embodiment of this embodiment, by providing a protective part, it can prevent the connection position between the first extension section and the rotating structure from being splashed wet by liquids such as rainwater, sewage, cleaning water, etc. during vehicle operation, avoiding corrosion of the connection position, and thus extending the service life of the transmission shaft.

[0024] 5. As a preferred embodiment of the present application, by providing that the rotating structure has a second extension section, the second extension section protrudes from the support frame, the transmission hole extends to the end face of the second extension section facing the rear axle, and a guiding section is provided in the transmission hole, further improving the supporting ability of the rotating structure. The increased length of the guiding section can ensure the stability of the movement of the mating part, thereby improving the stability and load-bearing capacity of the connecting section. Providing the second extension section is more helpful for distributing the load borne by the connecting section, reducing the local stress concentration on the connecting section, thereby extending the service life of the transmission shaft and improving the stability of the transmission shaft. In addition, the setting of the second extension section maintains the coaxiality of the transmission shaft and reduces vibration and noise caused by axis offset.

[0025] In an embodiment of this embodiment, the guiding section extends towards the rear axle and protrudes from the second extension section, and the contact length between the guiding section and the mating part is further increased, improving the stability of the movement of the mating part, and thus improving the stability and load-bearing capacity of the movement of the connecting section.

[0026] Furthermore, by providing a protective part connected to the second extension section, it can prevent the guiding section and the connecting section from being splashed wet by liquids such as rainwater, sewage, cleaning water, etc. during vehicle operation, prevent the guiding section and the connecting section from being corroded, ensure the stability of the movement of the connecting section, and extend the service life of the transmission shaft.

[0027] 6. As a preferred embodiment of the present application, the movement distance of the connecting section can be limited by setting the limiting part. When the connecting section moves towards the front axle tube and reaches the maximum movement distance, the abutting part abuts against the limiting part, which can prevent the connecting section from exceeding the movement range and avoid damage to the connecting section, thereby prolonging the service life of the transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0029] Figure 1 is the front view of the transmission shaft under an embodiment of the present application;

[0030] Figure 2 is the top view of the transmission shaft under an embodiment of the present application;

[0031] Figure 3 is Figure 2 the sectional view along the A-A direction;

[0032] Figure 4 is Figure 3 the enlarged view of part B in

[0033] Figure 5 is Figure 3 the enlarged view of part C in

[0034] Reference numerals:

[0035] 1. Transmission shaft;

[0036] 2. Front axle; 21. Driving section; 211. Moving part; 22. Front axle tube; 221. First extension section; 2211. First transmission hole; 222. Accommodating section;

[0037] 3. Rear axle; 31. Driven section; 32. Connecting section; 321. Fitting part; 322. Limiting part; 323. Telescopic part;

[0038] 4. Support frame; 41. Rotating structure; 411. Transmission hole; 412. Guiding part; 4121. Fitting hole; 413. Abutting part; 414. Second extension section;

[0039] 5. Protective part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail by way of examples in conjunction with the drawings of the specification.

[0041] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application may be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below. It should be noted that, without conflict, the embodiments of the present application and the features in each embodiment may be combined with each other.

[0042] In addition, in the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0043] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application may be understood according to specific circumstances.

[0044] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0045] Such as Figure 1 , Figure 2 , Figure 3 , Figure 5As shown in the figure, a drive shaft 1 for a vehicle is provided. The drive shaft 1 includes a front shaft 2 that is in transmission connection with a driving device, and a rear shaft 3 that is in transmission connection with the front shaft 2 and is in transmission connection with the rear axle of the vehicle. A support frame 4 is provided between the front shaft 2 and the rear shaft 3. The support frame 4 is fixed to the vehicle body to support the drive shaft 1. The front shaft 2 has a driving section 21 and a front shaft tube 22. One end of the driving section 21 is connected to the driving device, and the other end is telescopically connected to the front shaft tube 22. The rear shaft 3 includes a driven section 31 connected to the rear axle of the vehicle and a connecting section 32 connected to the driven section 31. The drive shaft 1 further includes a rotating structure 41 provided on the support frame 4 and in transmission connection with the front shaft tube 22. The connecting section 32 is in transmission connection with the rotating structure 41 and can reciprocate horizontally relative to the rotating structure 41.

[0046] In this application, by setting the telescopic connection between the driving section 21 and the front shaft tube 22, the length of the front shaft 2 can be adjusted. In a preferred embodiment, when the axial distance between the vehicle support frame 4 and the driving device changes along the vehicle axis, the length of the front shaft 2 is adjusted to adapt to the changed vehicle, avoiding the need to replace the new drive shaft 1, improving the adaptability and flexibility of the drive shaft 1, reducing production costs, and improving production efficiency. At the same time, by setting the rotating structure 41 in transmission connection with the front shaft tube 22, the connecting section 32 is in transmission connection with the rotating structure 41 and can reciprocate horizontally relative to the rotating structure 41. The support frame 4 is used to limit the vibration amplitude during the telescopic process of the connecting section 32, reduce the vibration transmitted by the driven section 31, reduce the wear of the drive shaft 1 components, and ensure the stable transmission of torque by the drive shaft 1. At the same time, the support frame 4 can provide a stable supporting force for the connecting section 32, thereby improving the stability and reliability of the drive shaft 1, ensuring the stable transmission of torque by the drive shaft 1, and extending the service life of the drive shaft 1. The reciprocating movement of the connecting section 32 relative to the rotating structure 41 can ensure that when the distance between the rear axle of the vehicle and the support frame 4 changes during the vehicle driving, the drive shaft 1 automatically adjusts its length to ensure the continuous transmission of vehicle power.

[0047] As a preferred embodiment of this application, as Figure 1 、 Figure 3 、 Figure 5 shown, the rotating structure 41 is provided with a transmission hole 411. Inside the transmission hole 411, there is a guiding portion 412 extending along the horizontal direction in the reciprocating movement direction of the connecting section 32 ( Figure 5 the horizontal direction in

[0048] By providing a transmission hole 411 in the rotating structure 41 and a guiding portion 412 in the transmission hole 411, the connecting section 32 moves relative to the support frame 4 as the mating portion 321 moves along the guiding portion 412. Especially during the telescoping process of the connecting section 32, the support frame 4 can more directly cancel out the vibrations generated by the connecting section 32. The mating portion 321 moves along the guiding portion 412, improving the movement stability of the mating portion 321, and thus enhancing the telescoping stability of the connecting section 32. At the same time, by providing the guiding portion 412 to cooperate with the mating portion 321, it helps to disperse the load of the connecting section 32, provides a stable supporting force to the connecting section 32, reduces local stress concentration on the transmission shaft 1, thereby extending the service life of the transmission shaft 1 and improving the stability of the transmission shaft 1.

[0049] In a preferred embodiment of this implementation manner, the guiding portion 412 has a mating hole 4121. A guiding groove extending along the transverse reciprocating movement direction of the connecting section 32 is provided in the mating hole 4121. The guiding grooves are circumferentially spaced along the mating hole 4121. The mating portion 321 is a guiding protrusion that mates with the guiding groove.

[0050] By providing the guiding portion 412 with a mating hole 4121 and a guiding groove extending along the transverse reciprocating movement direction of the connecting section 32 in the mating hole 4121, and the mating portion 321 being a guiding protrusion that mates with the guiding groove, the guiding protrusion moves along the guiding groove, improving the movement stability of the connecting section 32. The guiding groove extends along the transverse reciprocating movement direction of the connecting section 32, helping to improve the movement accuracy of the mating portion 321 and avoid deviation. At the same time, the contact area between the guiding groove and the guiding protrusion increases, which is more conducive to improving the movement stability of the connecting section 32 and the reliability of torque transmission. The guiding grooves are circumferentially spaced along the mating hole 4121, further increasing the contact area between the guiding groove and the guiding protrusion, enhancing the supporting and guiding effects of the guiding groove on the guiding protrusion, and ensuring the movement stability of the mating portion 321.

[0051] As Figure 5 shown, preferably, the rotating structure 41 has a bearing provided on the support frame 4. Through the bearing, the rotating structure 41 can be driven to rotate by the front axle tube 22. The guiding portion 412 is a spline sleeve, and the spline sleeve is connected to the inner wall of the bearing. The mating portion 321 is a spline provided on the connecting section 32. In this application, the manner in which the rotating structure 41 realizes rotation is not limited. It can be through a bearing provided on the positioning bracket, or by providing grooves or protrusions on the surface of the rotating structure 41 to cooperate with the support frame 4 to achieve rotation. The guiding portion 412 can be provided with a spline sleeve or a spline. When the guiding portion 412 is provided with a spline, the mating portion 321 is a spline groove provided on the connecting section 32. Those skilled in the art can clearly understand that the guiding portion 412 can also be a spline or a spline groove circumferentially provided in the transmission hole 411.

[0052] In this embodiment, the front axle tube 22 can be arranged in any of the following embodiments:

[0053] Embodiment 1: As Figure 5 shown, the front axle tube 22 has a first extension section 221 extending towards the rotating structure 41 and connected to the rotating structure 41. The guiding part 412 has a mating hole 4121. The mating part 321 moves within the mating hole 4121. The first extension section 221 has a first transmission hole 2211 coaxially arranged with the mating hole 4121, and the aperture of the first transmission hole 2211 is greater than or equal to the aperture of the mating hole 4121. Preferably, the aperture of the first transmission hole 2211 is greater than the aperture of the mating hole 4121. Those skilled in the art can clearly understand that the arrangement of the first transmission hole 2211 can be the above-mentioned arrangement, or the first transmission hole 2211 includes a connection end having the same aperture as the mating hole 4121 and connected to the mating hole 4121, and a receiving end connected to the connection end, and the aperture of the receiving end is greater than the aperture of the mating hole 4121. By providing the first extension section 221, the first extension section 221 has a first transmission hole 2211 coaxially arranged with the mating hole 4121, and the diameter of the first transmission hole 2211 is greater than or equal to the diameter of the mating hole 4121, so that the mating part 321 can move along the mating hole 4121 into the first transmission hole 2211, increasing the movable distance of the connecting section 32 and expanding the range of scenarios that the vehicle can adapt to.

[0054] Embodiment 2: The front axle tube 22 has a first extension section 221 extending towards the rotating structure 41 and connected to the rotating structure 41. The first extension section 221 has a first transmission hole 2211. The aperture of the first transmission hole 2211 at the end connected to the mating hole 4121 is equal to the aperture of the mating hole 4121. Along the direction towards the active section 21, the first transmission hole 2211 has a limiting end with an aperture smaller than that of the mating hole 4121. When the mating part 321 moves to the limiting end, the connecting section 32 abuts against the inner wall of the first transmission hole 2211, and the connecting section 32 stops moving, achieving the function of limiting the moving distance of the connecting section 32.

[0055] In a specific example under Embodiment 1 and Embodiment 2, a first guiding portion (not shown in the drawings) that mates with the mating portion 321 is provided in the first transmission hole 2211 to enable telescopic connection between the connecting section 32 and the first extension section 221. By providing the first guiding portion that mates with the mating portion 321 in the first transmission hole 2211 to enable telescopic connection between the connecting section 32 and the first extension section 221, the first guiding portion and the guiding portion 412 jointly guide the mating portion 321, which helps improve the stability of the movement of the mating portion 321, and also facilitates the connecting section 32 to disperse the load and reduce local stress concentration in the connecting section 32, thereby extending the service life of the transmission shaft 1 and improving the stability of the transmission shaft 1. Moreover, adding the first guiding portion helps maintain the coaxiality of the transmission shaft 1 and reduce vibration and noise caused by axis offset. Preferably, the first guiding portion is a spline sleeve.

[0056] Preferably, the support frame 4 is provided with a protective member covering the connection position between the first extension section 221 and the rotating structure 41. By providing the protective member, it is possible to prevent the connection position between the first extension section 221 and the rotating structure 41 from being splashed wet by liquids such as rainwater, sewage, cleaning water, etc. during vehicle operation, avoid corrosion of the connection position, and thereby extend the service life of the transmission shaft 1.

[0057] As a preferred embodiment of the present application, as Figure 5 shown, the rotating structure 41 is provided with a second extension section 414 extending toward the rear axle 3, and the second extension section 414 protrudes from the support frame 4. The rotating structure 41 is provided with a transmission hole 411, the transmission hole 411 extends to the end face of the second extension section 414 facing the rear axle 3, a guiding portion 412 extending along the transverse reciprocating movement direction of the connecting section 32 is provided in the transmission hole 411, the connecting section 32 is provided with a mating portion 321 that mates with the guiding portion 412, and the mating portion 321 moves along the guiding portion 412 to realize the movement of the connecting section 32 relative to the support frame 4.

[0058] By providing that the rotating structure 41 has a second extension section 414, the second extension section 414 protrudes from the support frame 4, the transmission hole 411 extends to the end face of the second extension section 414 facing the rear axle 3, and the transmission hole 411 extends to the end face of the second extension section 414 facing the rear axle 3, and a guiding portion 412 is provided in the transmission hole 411, the supporting ability of the rotating structure 41 is further improved. The increase in the length of the guiding portion 412 can ensure the stability of the movement of the mating portion 321, and further improve the stability and load-bearing capacity of the connecting section 32. Providing the second extension section 414 is more helpful for dispersing the load borne by the connecting section 32, reducing local stress concentration in the connecting section 32, thereby extending the service life of the transmission shaft 1 and improving the stability of the transmission shaft 1. In addition, the setting of the second extension section 414 maintains the coaxiality of the transmission shaft 1 and reduces vibration and noise caused by axis offset.

[0059] In this application, it is clear to those skilled in the art that the extension length of the guide portion 412 provided in the transmission hole 411 is not limited. As the length of the guide portion 412 increases, the length of the matching portion 321 may be increased accordingly, thereby improving the stability of the connecting section 32. In one embodiment of this embodiment, Figure 5 As shown, the guide portion 412 extends toward the rear axle 3 and protrudes from the second extension section 414. The guide portion 412 extends toward the rear axle 3 and protrudes from the second extension section 414. This further increases the contact length between the guide portion 412 and the mating portion 321, improving the stability of the mating portion 321 and, in turn, the stability and load-bearing capacity of the connecting section 32.

[0060] In a specific example of this embodiment, the drive shaft 1 is further provided with a protective member 5 connected to the second extension section 414. The protective member 5 covers the guide portion 412 and the connecting section 32. Preferably, the protective member 5 is a bellows. The protective member 5 connected to the second extension section 414 protects the guide portion 412 and the connecting section 32 from being splashed by liquids such as rainwater, sewage, and clean water during vehicle operation, thereby preventing corrosion of the guide portion 412 and the connecting section 32, ensuring stable movement of the connecting section 32, and extending the service life of the drive shaft 1.

[0061] In the present application, the telescopic limit setting of the connecting section 32 can be any one of the following embodiments:

[0062] Implementation method 1: Figure 5 As shown, the connecting section 32 includes a telescopic portion 323 that is transmission-connected to the rotating structure 41, and a limiting portion 322 that is connected to the rear axle 3 and has a larger diameter than the telescopic portion 323. The rotating structure 41 is provided with an abutting portion 413 that cooperates with the limiting portion 322. Preferably, the telescopic portion 323 is provided with a matching portion 321 that moves along the guide portion 412 to enable the connecting section 32 to move relative to the support frame 4. The abutting portion 413 is the end surface of the second extension section 414 facing the rear axle 3. The provision of the limiting portion 322 can limit the movement distance of the connecting section 32. When the connecting section 32 moves toward the front axle tube 22 and reaches its maximum movement distance, the abutting portion 413 abuts the limiting portion 322, preventing the connecting section 32 from exceeding its range of movement and avoiding damage to the connecting section 32, thereby extending the service life of the drive shaft 1.

[0063] Embodiment 2: The connecting section 32 is provided with a groove, and the rotating structure 41 is provided with a protrusion that matches the groove. The protrusion abuts against the end surface of the groove to limit the displacement of the connecting section 32.

[0064] As a preferred embodiment of the present application, Figure 1 、 Figure 4As shown in the figure, one of the active section 21 and the front axle tube 22 is provided with a receiving portion 222. An protruding member or a guiding groove is provided in the receiving portion 222, and the other of the two is provided with a moving portion 211 disposed in the receiving portion 222 and cooperating with the protruding member or the guiding groove. The active section 21 drives the front axle tube 22 to rotate through the moving portion 211, and the moving portion 211 moves along the protruding member or the guiding groove to realize the relative movement of the active section 21 with respect to the front axle tube 22. Preferably, as Figure 4 shown, the active section 21 is provided with the moving portion 211, and the front axle tube 22 is provided with the receiving portion 222. As Figure 1 , Figure 4 shown, the moving portion 211 is a spline shaft provided on the active section 21, and the receiving portion 222 is provided with a spline groove to realize the movement of the moving portion 211 along the receiving portion 222.

[0065] Those skilled in the art can clearly understand that in this application, the active section 21 and the driving device, the connecting section 32 and the driven section 31, and the driven section 31 and the main reducer can all be connected through a reversing component such as a universal joint to adjust the angle of the transmission shaft 1 and ensure the continuous transmission of power.

[0066] In this application, the parts not described can be realized by adopting or referring to the existing technologies.

[0067] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key point of each embodiment is to illustrate the differences from other embodiments.

[0068] The above are only the embodiments of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. A drive shaft for a vehicle, the drive shaft comprising a front shaft drivingly connected to a driving device and a rear shaft drivingly connected to the front shaft and drivingly connected to the rear axle of the vehicle, a support frame being provided between the front shaft and the rear shaft, the support frame being fixed to the vehicle body to support the drive shaft, characterized in that: The front shaft has a driving section and a front shaft tube, one end of the driving section is connected to the driving device, and the other end is telescopically connected to the front shaft tube. The rear shaft includes a driven section connected to the rear axle of the vehicle and a connecting section connected to the driven section. The drive shaft further includes a rotating structure provided on the support frame and drivingly connected to the front shaft tube, and the connecting section is drivingly connected to the rotating structure and can reciprocate transversely relative to the rotating structure.

2. The drive shaft for a vehicle according to claim 1, characterized in that: The rotating structure is provided with a transmission hole, and a guiding portion extending along the transverse reciprocating movement direction of the connecting section is provided in the transmission hole. The connecting section is provided with a cooperating portion cooperating with the guiding portion, and the cooperating portion moves along the guiding portion to realize the movement of the connecting section relative to the support frame.

3. The drive shaft for a vehicle according to claim 2, characterized in that: The guiding portion has a cooperating hole, and guiding grooves extending along the transverse reciprocating movement direction of the connecting section are provided in the cooperating hole. The guiding grooves are circumferentially spaced along the cooperating hole. The cooperating portion is a guiding protrusion cooperating with the guiding grooves.

4. The drive shaft for a vehicle according to claim 2, characterized in that: The front shaft tube has a first extension section extending towards the rotating structure and connected to the rotating structure. The guiding portion has a cooperating hole, and the cooperating portion moves in the cooperating hole. The first extension section has a first transmission hole coaxially arranged with the cooperating hole, and the aperture of the first transmission hole is greater than or equal to the aperture of the cooperating hole.

5. The drive shaft for a vehicle according to claim 4, characterized in that: A first guiding portion cooperating with the cooperating portion is provided in the first transmission hole so that the connecting section and the first extension section can be telescopically connected.

6. The drive shaft for a vehicle according to claim 4, characterized in that: The support frame is provided with a protective member covering the connection position between the first extension section and the rotating structure.

7. The drive shaft for a vehicle according to claim 1, characterized in that: The rotating structure is provided with a second extension section extending towards the rear shaft, and the second extension section protrudes from the support frame; The rotating structure is provided with a transmission hole, the transmission hole extends to the end face of the second extension section facing the rear shaft, and a guiding portion extending along the transverse reciprocating movement direction of the connecting section is provided in the transmission hole, and the connecting section is provided with a cooperating portion cooperating with the guiding portion, and the cooperating portion moves along the guiding portion to realize the movement of the connecting section relative to the support frame.

8. The drive shaft for a vehicle according to claim 7, characterized in that: The guiding portion extends towards the rear shaft and protrudes from the second extension section.

9. A drive shaft for vehicle use according to claim 8, characterized in that: The drive shaft is further provided with a protective member connected to the second extension section, and the protective member covers the guiding section and the connecting section.

10. A drive shaft for vehicle use according to claim 1, characterized in that: The connecting section includes a telescopic section drivingly connected to the rotating structure and a limiting section connecting the rear axle and having a shaft diameter larger than that of the telescopic section, and the rotating structure is provided with an abutting section cooperating with the limiting section.

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