Dustproof cover of transmission shaft telescopic spline pair, transmission shaft assembly and vehicle

Abstract

The invention relates to the technical field of automobile design, in particular to a dustproof cover of a transmission shaft telescopic spline pair, a transmission shaft assembly and a vehicle. The dustproof cover of the transmission shaft telescopic spline pair is used for being arranged outside the transmission shaft telescopic spline pair in a sleeving mode, the transmission shaft telescopic spline pair comprises an outer spline shaft and an inner spline shaft which are in spline connection, and the dustproof cover comprises an observation part, a first telescopic part and a second telescopic part, the inner spline shaft is sleeved with the first telescopic part, the outer spline shaft is sleeved with the second telescopic part, the observation part is made of transparent materials, and the first telescopic part and the second telescopic part can stretch out and draw back in the axial direction of the transmission shaft telescopic spline pair. The spline pair of the transmission shaft is arranged in the dustproof cover, so that impurities can be prevented from entering the spline pair of the transmission shaft; the observation part can move through the first telescopic part and the second telescopic part, the abrasion condition of the spline pair can be observed in time, excessive damage to the transmission shaft spline pair is avoided, and timely maintenance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile design, and in particular to a dust cover of a transmission shaft telescopic spline pair, a transmission shaft assembly and a vehicle. Background Art

[0002] In the field of commercial vehicles, the length of buses and trucks is mostly 5-10 meters. The power chain from the engine output end to the bridge input flange is very long. In most cases, 2 to 4 transmission shafts are required. Together with the engine, gearbox and drive axle, they transmit power from the gearbox to the wheels. Due to different vehicle loads, different vehicle operating surfaces, and different operating environments, the transmission shaft needs to have a certain amount of expansion and contraction to cope with the instantaneous deformation of the vehicle buffer or elastic elements in the face of factors such as load changes and road bumps. Generally speaking, the expansion and contraction of the transmission shaft is achieved through the structure of the transmission shaft expansion spline subassembly.

[0003] The transmission shaft telescopic spline subassembly is mainly composed of structures such as a spline shaft, a spline sleeve, a dust cover and an oil seal. The spline shaft and the spline sleeve are matched through splines to ensure that the transmission shaft can achieve relative movement and that the entire vehicle has a certain amount of telescopic function. During the spline matching process, the spline pair needs to be lubricated with a specific grease to ensure that the spline pair will not suffer structural damage due to frequent relative movement during movement. In common designs, a dust cover structure is often designed to wrap the spline subassembly with a dust cover. An oil seal is set at the outermost end of the dust cover. The oil seal ensures the cleanliness of the sealing cavity and prevents moisture, dust and impurities in the external environment from entering the spline pair.

[0004] However, due to the particularity of the transmission shaft structure, the spline pairs frequently move relative to each other, resulting in serious wear on the dustproof oil seal mating surface. The dustproof oil seal is very likely to fail, causing mud, water and dust to enter the spline pair and cause damage. In addition, since the spline pair is wrapped in a dust cover, it is impossible to confirm from the outside whether the oil seal has failed. Since the transmission shaft is not easy to disassemble and assemble, the failure of the oil seal is not easy to be discovered. When the transmission shaft has serious shaking, abnormal noise and other problems, the transmission shaft spline pair has been excessively damaged and can only be repaired by replacement, resulting in high repair costs and long repair time.

[0005] Therefore, there is an urgent need for a dust cover for a transmission shaft telescopic spline pair, a transmission shaft assembly and a vehicle to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a dust cover for a transmission shaft telescopic spline pair, a transmission shaft assembly and a vehicle, which can prevent impurities from entering the interior of the transmission shaft spline pair, and can timely observe the transmission shaft spline pair to avoid excessive damage to the transmission shaft spline pair.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A dust cover for a transmission shaft telescopic spline pair, used to be sleeved on the outside of the transmission shaft telescopic spline pair, the transmission shaft telescopic spline pair includes an outer spline shaft and an inner spline shaft connected by splines, including: an observation part, a first telescopic part and a second telescopic part, the two ends of the observation part are respectively connected to the first telescopic part and the second telescopic part, the first telescopic part is sleeved on the inner spline shaft, the second telescopic part is sleeved on the outer spline shaft, the observation part is made of transparent material, the first telescopic part and the second telescopic part are both made of elastic material, and the first telescopic part and the second telescopic part can be telescoped along the axial direction of the transmission shaft telescopic spline pair.

[0009] As a preferred technical solution for the dust cover of the above-mentioned transmission shaft telescopic spline pair, the first telescopic part and the second telescopic part are both wavy, and the first telescopic part and the second telescopic part can be stretched or compressed along the axial direction of the transmission shaft telescopic spline pair.

[0010] As a preferred technical solution for the dust cover of the above-mentioned transmission shaft telescopic spline pair, the dust cover of the transmission shaft telescopic spline pair also includes a telescopic bracket, which is arranged inside the observation part, the first telescopic part and the second telescopic part, and the deformation of the first telescopic part and the second telescopic part can drive the deformation of the telescopic bracket.

[0011] As a preferred technical solution for the dust cover of the above-mentioned telescopic spline pair of the transmission shaft, the telescopic bracket includes a plurality of metal frames, and the plurality of metal frames are arranged at circumferential intervals along the telescopic spline pair of the transmission shaft. The metal frame includes a metal wire, a first deformation portion and a second deformation portion, the first deformation portion and the second deformation portion are connected to both ends of the metal wire, and the metal wire is arranged in the observation portion, the first deformation portion is arranged in the first telescopic portion, and the second deformation portion is arranged in the second telescopic portion.

[0012] As an optimal technical solution for the dust cover of the above-mentioned transmission shaft telescopic spline pair, the first deformation portion includes a first connecting member and a second connecting member, the first connecting member and the second connecting member are spaced apart, and the first connecting member is connected to one end of the metal wire, the second deformation portion includes a third connecting member and a fourth connecting member, the third connecting member and the fourth connecting member are spaced apart, and the third connecting member is connected to the other end of the metal wire, and the dust cover of the transmission shaft telescopic spline pair also includes a plurality of circular rings, a part of the plurality of circular rings are spaced apart at different wave crests between the first connecting member and the second connecting member, and another part of the plurality of circular rings are spaced apart at different wave crests between the third connecting member and the fourth connecting member.

[0013] As a preferred technical solution for the dust cover of the above-mentioned transmission shaft telescopic spline pair, the observation part is made of silicone.

[0014] As a preferred technical solution for the dust cover of the above-mentioned transmission shaft telescopic spline pair, the observation part, the first telescopic part and the second telescopic part are integrally formed.

[0015] As a preferred technical solution for the dust cover of the above-mentioned transmission shaft telescopic spline pair, the ends of the first telescopic part and the second telescopic part are both provided with grooves for cooperating with cable ties for bundling.

[0016] A transmission shaft assembly includes an inner spline shaft and an outer spline shaft, the transmission shaft assembly also includes a dust cover of the transmission shaft telescopic spline pair in any of the above-mentioned preferred technical solutions, the inner spline shaft is spline-connected to the outer spline shaft, the inner spline shaft and the outer spline shaft cooperate to form a spline pair that can generate relative motion, and the dust cover of the transmission shaft telescopic spline pair is sleeved on the outer periphery of the spline pair.

[0017] A vehicle comprises a driving device, and the vehicle further comprises a transmission shaft assembly in the above-mentioned preferred technical solution, wherein the driving device is in transmission connection with the transmission shaft assembly.

[0018] Beneficial effects of the present invention:

[0019] The present invention provides a dust cover for a transmission shaft telescopic spline pair, which is used to be sleeved on the outside of the transmission shaft telescopic spline pair, the transmission shaft telescopic spline pair includes an outer spline shaft and an inner spline shaft connected by splines, and includes: an observation part, a first telescopic part and a second telescopic part, the two ends of the observation part are respectively connected to the first telescopic part and the second telescopic part, the first telescopic part is sleeved on the inner spline shaft, the second telescopic part is sleeved on the outer spline shaft, the observation part is made of a transparent material, the first telescopic part and the second telescopic part are both made of an elastic material, and the first telescopic part and the second telescopic part can be telescoped along the axial direction of the transmission shaft telescopic spline pair. The spline pair of the transmission shaft is arranged in the dust cover, which can prevent impurities from entering the interior of the transmission shaft spline pair; the observation part can be moved through the first telescopic part and the second telescopic part, and the wear of the spline pair can be observed in time, so as to avoid excessive damage to the transmission shaft spline pair and achieve timely maintenance.

[0020] The present invention also provides a transmission shaft assembly, including an inner spline shaft, an outer spline shaft and a dust cover of the transmission shaft telescopic spline pair, wherein the inner spline shaft is spline-connected with the outer spline shaft, the inner spline shaft and the outer spline shaft cooperate to form a spline pair capable of generating relative motion, and the dust cover is sleeved on the outer periphery of the spline pair. Compared with the prior art, the dust cover of the transmission shaft telescopic spline pair can isolate air impurities and moisture, ensure the working environment of the spline pair, cancel the metal dust cover and oil seal combination, simplify the structure of the transmission shaft assembly, and increase the service life.

[0021] The present invention also provides a vehicle, comprising a drive device and the transmission shaft assembly, wherein the drive device is in transmission connection with the transmission shaft assembly. Compared with the prior art, the service life of the transmission shaft assembly is increased, so that the vehicle can maintain long-term stable operation, avoid product failure, and save maintenance time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a transmission shaft assembly provided by an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A partial enlarged view of middle A;

[0025] Figure 3 A schematic structural diagram of a dust cover of a transmission shaft telescopic spline pair provided in Embodiment 1 of the present invention;

[0026] Figure 4 A schematic structural diagram of a dust cover of a transmission shaft telescopic spline pair provided in Embodiment 2 of the present invention;

[0027] Figure 5 A schematic diagram of the structure of a metal wire and a circular ring provided in the second embodiment of the present invention;

[0028] Figure 6 A schematic structural diagram of a dust cover of a transmission shaft telescopic spline pair provided in Embodiment 3 of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the metal skeleton provided in Example 3 of the present invention.

[0030] In the figure:

[0031] 1. External spline shaft; 2. Internal spline shaft; 3. Observation part; 4. First telescopic part; 41. First fold; 5. Second telescopic part; 51. Second fold; 6. Telescopic bracket; 61. Metal skeleton; 611. Metal wire; 612. First deformation part; 6121. First connecting piece; 6122. Second connecting piece; 6123. Third fold; 613. Second deformation part; 6131. ​​Third connecting piece; 6132. Fourth connecting piece; 6133. Fourth fold; 7. Ring; 8. Groove. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] like Figures 1 to 3As shown, the present invention provides a dust cover for a transmission shaft telescopic spline pair, which is used to be sleeved on the outside of the transmission shaft telescopic spline pair. The transmission shaft telescopic spline pair includes an outer spline shaft 1 and an inner spline shaft 2 connected by splines, including: an observation part 3, a first telescopic part 4 and a second telescopic part 5.

[0037] Specifically, the two ends of the observation part 3 are connected to the first telescopic part 4 and the second telescopic part 5 respectively, the first telescopic part 4 is sleeved on the inner spline shaft 2, and the second telescopic part 5 is sleeved on the outer spline shaft 1. The observation part 3 is made of a transparent material, and the first telescopic part 4 and the second telescopic part 5 are made of an elastic material. The first telescopic part 4 and the second telescopic part 5 can be extended and retracted along the axial direction of the transmission shaft telescopic spline pair. The spline pair of the transmission shaft is arranged in a dust cover to prevent impurities from entering the interior of the transmission shaft spline pair; the observation part 3 can be moved through the first telescopic part 4 and the second telescopic part 5, and the wear of the spline pair can be observed in time to avoid excessive damage to the spline pair of the transmission shaft, so as to achieve timely maintenance.

[0038] Optionally, the cross-sections of the first telescopic portion 4 and the second telescopic portion 5 are both wavy, and the first telescopic portion 4 and the second telescopic portion 5 can be stretched or compressed along the axial direction of the telescopic spline pair of the transmission shaft. Specifically, the first telescopic portion 4 is provided with a plurality of first folds 41, which can be stretched or compressed; the second telescopic portion 5 is provided with a plurality of second folds 51, which can be stretched or compressed, to ensure the telescopic deformation effect of the first telescopic portion 4 and the second telescopic portion 5.

[0039] Furthermore, the structure of the first telescopic portion 4 may be the same as or different from the structure of the second telescopic portion 5 ; the number of the first folds 41 may be the same as or different from the number of the second folds 51 .

[0040] Optionally, grooves 8 are provided at the ends of the first telescopic part 4 and the second telescopic part 5. The two grooves 8 are respectively located at the two ends of the dust cover. The grooves 8 can be fixed on the transmission shaft by metal cable ties or plastic cable ties to ensure the overall support performance of the dust cover.

[0041] Optionally, the dust cover of the telescopic spline pair of the transmission shaft also includes a telescopic bracket 6, which is arranged inside the observation part 3, the first telescopic part 4 and the second telescopic part 5. The deformation of the first telescopic part 4 and the second telescopic part 5 can drive the deformation of the telescopic bracket 6, which can effectively support the dust cover, improve the strength of the dust cover, and prevent the dust cover from direct contact with the telescopic spline pair of the transmission shaft.

[0042] Optionally, the retractable bracket 6 includes a plurality of metal skeletons 61, which are arranged at circumferential intervals along the telescopic spline pair of the transmission shaft, and the metal skeleton 61 includes a metal wire 611, a first deformation portion 612 and a second deformation portion 613, the first deformation portion 612 and the second deformation portion 613 are connected to both ends of the metal wire 611, and the metal wire 611 is arranged in the observation portion 3, the first deformation portion 612 is arranged in the first telescopic portion 4, and the second deformation portion 613 is arranged in the second telescopic portion 5. Specifically, the first deformation part 612 is provided with a plurality of third folds 6123, and the second deformation part 613 is provided with a plurality of fourth folds 6133. The structure of the first deformation part 612 is the same as that of the first telescopic part 4. The first deformation part 612 is shaped according to the shape of the first fold 41. The third fold 6123 has a certain elasticity, so that the turning part of the metal skeleton 61 can have a certain amount of expansion and contraction, and can also play a sufficient supporting role to prevent friction between the first telescopic part 4 and the transmission shaft, and avoid the first telescopic part 4 from being worn and damaged, thereby ensuring the stability of the high-speed rotation of the transmission shaft and a The structure of the second deformation part 613 is the same as that of the second telescopic part 5. The second deformation part 613 is shaped according to the shape of the second fold 51. The fourth fold 6133 has a certain elasticity, so that the turning part of the metal skeleton 61 can have a certain amount of expansion and contraction, and can also play a sufficient supporting role to prevent friction between the second telescopic part 5 and the transmission shaft, and avoid the second telescopic part 5 from being worn and damaged, thereby ensuring the stability of the high-speed rotation of the transmission shaft and a certain amount of expansion and contraction; at the same time, the structure of each part of the transmission shaft telescopic spline pair can be observed through the gap between adjacent metal skeletons 61. In this embodiment, the dust cover of the transmission shaft telescopic spline pair includes eight metal skeletons 61, and extends from one end of the dust cover to the other end of the dust cover, which can improve the structural stability of the dust cover and avoid deformation of the dust cover. Of course, in some other embodiments, the number of metal skeletons 61 can be determined according to the actual strength requirements of the dust cover, which will not be repeated here.

[0043] Furthermore, the first deformation portion 612 includes a first connecting member 6121 and a second connecting member 6122, the first connecting member 6121 and the second connecting member 6122 are arranged at intervals, and the first connecting member 6121 is connected to one end of the metal wire 611, the second deformation portion 613 includes a third connecting member 6131 and a fourth connecting member 6132, the third connecting member 6131 and the fourth connecting member 6132 are arranged at intervals, and the third connecting member 6131 is connected to the other end of the metal wire 611, and the dust cover of the transmission shaft telescopic spline pair also includes a plurality of circular rings 7, a part of the plurality of circular rings 7 are arranged at different peaks between the first connecting member 6121 and the second connecting member 6122, and another part of the circular rings 7 are arranged at different peaks between the third connecting member 6131 and the fourth connecting member 6132. Specifically, a part of the third fold 6123 is provided at one end of the first connecting member 6121 close to the observation part 3, which is used to match with the first fold 41; a straight section is provided at one end of the first connecting member 6121 away from the observation part 3, and the straight section is squeezed onto the transmission shaft by a metal tie or a plastic tie to ensure the stability of the dust cover; the height of the first wave peak connected to the metal wire 611 by the second connecting member 6122 is lower than the height of other wave peaks, which matches with the transition connection between the observation part 3 and the first telescopic part 4, ensuring the continuity and integrity of the dust cover; a number of rings 7 are provided between the first connecting member 6121 and the second connecting member 6122 to support a number of third folds 6123, improve the deformation ability of the first deformation part 612, and adapt to the transmission shaft matching scenario with a larger telescopic amount. The second deformation part 613 has the same corresponding structure as the first deformation part 612, which will not be repeated here.

[0044] Optionally, the observation portion 3, the first telescopic portion 4 and the second telescopic portion 5 are all made of silicone, which is soft and has high toughness, so as to achieve telescopic deformation of the observation portion 3, the first telescopic portion 4 and the second telescopic portion 5, and improve the service life of the dust cover. Furthermore, the observation portion 3, the first telescopic portion 4 and the second telescopic portion 5 are integrally formed, which can improve the stability of the dust cover and ensure the sealing of the dust cover.

[0045] Furthermore, the silicone structure of the dust cover and the supporting structure of the dust cover are hot-pressed into one piece, which can improve the firmness and stability of the dust cover.

[0046] The present invention also provides a transmission shaft assembly, including an inner spline shaft 2 and an outer spline shaft 1, the transmission shaft assembly also includes a dust cover of the transmission shaft telescopic spline pair in any of the above-mentioned embodiments, the inner spline shaft 2 is spline-connected with the outer spline shaft 1, the inner spline shaft 2 and the outer spline shaft 1 cooperate to form a spline pair that can generate relative motion, the dust cover is sleeved on the outer periphery of the spline pair, and the transmission shaft assembly also includes other necessary components that constitute the transmission shaft assembly in the prior art.

[0047] The present invention also provides a vehicle, including a drive device. The vehicle also includes the transmission shaft assembly in the above embodiment, the drive device is transmission-connected to the transmission shaft assembly, and the vehicle also includes other necessary components that constitute the vehicle in the prior art.

[0048] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A dust cover for a transmission shaft telescopic spline pair, used for being sleeved on the outside of the transmission shaft telescopic spline pair, the transmission shaft telescopic spline pair comprising an outer spline shaft (1) and an inner spline shaft (2) connected by splines, characterized in that: include: An observation portion (3), a first telescopic portion (4) and a second telescopic portion (5), wherein the two ends of the observation portion (3) are respectively connected to the first telescopic portion (4) and the second telescopic portion (5), the first telescopic portion (4) is sleeved on the inner spline shaft (2), and the second telescopic portion (5) is sleeved on the outer spline shaft (1), the observation portion (3) is made of a transparent material, the first telescopic portion (4) and the second telescopic portion (5) are both made of an elastic material, and the first telescopic portion (4) and the second telescopic portion (5) are both able to telescope axially along the telescopic spline pair of the transmission shaft.

2. A dust cover for a transmission shaft telescopic spline pair according to claim 1, characterized in that: The first telescopic portion (4) and the second telescopic portion (5) are both wavy in shape, and the first telescopic portion (4) and the second telescopic portion (5) are both capable of being stretched or compressed along the axial direction of the telescopic spline pair of the transmission shaft.

3. A dust cover for a transmission shaft telescopic spline pair according to claim 2, characterized in that: The dust cover of the transmission shaft telescopic spline pair also includes a telescopic bracket (6), which is arranged inside the observation part (3), the first telescopic part (4) and the second telescopic part (5), and the deformation of the first telescopic part (4) and the second telescopic part (5) can drive the deformation of the telescopic bracket (6).

4. A dust cover for a transmission shaft telescopic spline pair according to claim 3, characterized in that: The telescopic bracket (6) includes a plurality of metal skeletons (61), and the plurality of metal skeletons (61) are arranged at circumferential intervals along the telescopic spline pair of the transmission shaft. The metal skeleton (61) includes a metal wire (611), a first deformation portion (612) and a second deformation portion (613), wherein the first deformation portion (612) and the second deformation portion (613) are connected to both ends of the metal wire (611), and the metal wire (611) is arranged in the observation portion (3), the first deformation portion (612) is arranged in the first telescopic portion (4), and the second deformation portion (613) is arranged in the second telescopic portion (5).

5. A dust cover for a transmission shaft telescopic spline pair according to claim 4, characterized in that: The first deformation part (612) includes a first connecting member (6121) and a second connecting member (6122), the first connecting member (6121) and the second connecting member (6122) are spaced apart, and the first connecting member (6121) is connected to one end of the metal wire (611), the second deformation part (613) includes a third connecting member (6131) and a fourth connecting member (6132), the third connecting member (6131) and the fourth connecting member (6132) are spaced apart, and the The third connecting member (6131) is connected to the other end of the metal wire (611), and the dust cover of the transmission shaft telescopic spline pair also includes a plurality of circular rings (7), a portion of the plurality of circular rings (7) are spaced apart at different wave crests between the first connecting member (6121) and the second connecting member (6122), and another portion of the plurality of circular rings (7) are spaced apart at different wave crests between the third connecting member (6131) and the fourth connecting member (6132).

6. A dust cover for a transmission shaft telescopic spline pair according to any one of claims 1 to 5, characterized in that: The observation part (3) is made of silicone.

7. A dust cover for a transmission shaft telescopic spline pair according to any one of claims 1 to 5, characterized in that: The observation portion (3), the first telescopic portion (4) and the second telescopic portion (5) are integrally formed.

8. A dust cover for a transmission shaft telescopic spline pair according to any one of claims 1 to 5, characterized in that: The ends of the first telescopic portion (4) and the second telescopic portion (5) are both provided with grooves (8) for cooperating with cable ties for bundling.

9. A transmission shaft assembly, comprising an inner spline shaft (2) and an outer spline shaft (1), characterized in that: The transmission shaft assembly also includes a dust cover of the transmission shaft telescopic spline pair as described in any one of claims 1 to 8, the inner spline shaft (2) is spline-connected to the outer spline shaft (1), the inner spline shaft (2) and the outer spline shaft (1) cooperate to form a spline pair capable of generating relative motion, and the dust cover of the transmission shaft telescopic spline pair is sleeved on the outer periphery of the spline pair.

10. A vehicle comprising a drive device, characterized in that The vehicle further comprises a transmission shaft assembly as claimed in claim 9, wherein the drive device is in transmission connection with the transmission shaft assembly.

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