Transmission shaft assembly and vehicle

Abstract

The transmission shaft assembly comprises an input shaft, an output shaft and a connecting shaft, a first external spline is arranged on the input shaft, one end of the input shaft is connected with a first universal joint, the first universal joint is suitable for being connected with a main speed reducer, a second external spline is arranged on the output shaft, one end of the output shaft is connected with a second universal joint, and the second universal joint is suitable for being connected with a main speed reducer. The input shaft is sleeved with one end of the connecting shaft, the output shaft is sleeved with the other end of the connecting shaft, an internal spline is arranged on the connecting shaft, the first external spline is connected with the internal spline so that the input shaft can slide and stretch out and draw back in the length direction of the connecting shaft, and the second external spline is connected with the internal spline. The output shaft slides and stretches out and draws back in the length direction of the connecting shaft. Through the arrangement, the transmission shaft assembly is not limited by dynamic balance verification requirements and equipment, so that the axial size of the transmission shaft assembly can be shortened, the boundary of the battery pack can be increased, and the electric quantity and the cruising ability of the battery pack are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a drive shaft assembly and a vehicle. Background Art

[0002] At present, the solution of the drive shaft assembly in fuel vehicles is simple and easy to apply. However, the drive shaft assembly in fuel vehicles needs to be separately subjected to dynamic balance verification, so it is restricted by the requirements and equipment for dynamic balance verification. Therefore, the shortest length of the drive shaft can only be 500 mm. If the drive shaft assembly is applied to new energy vehicles, it will limit the axial dimension of the powertrain in new energy vehicles. Moreover, the battery pack of new energy vehicles is arranged under the bottom plate of the powertrain, which will cause the drive shaft assembly to affect the boundary of the battery pack, thereby affecting the power and endurance of the battery pack. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a drive shaft assembly, which can shorten the axial dimension, thereby increasing the boundary of the battery pack, and further improving the power and endurance of the battery pack.

[0004] The utility model further provides a vehicle.

[0005] The drive shaft assembly according to the utility model includes: an input shaft, an output shaft and a connecting shaft. A first external spline is arranged on the input shaft. One end of the input shaft is connected to a first universal joint, which is adapted to be connected to a main reducer. A second external spline is arranged on the output shaft. One end of the output shaft is connected to a second universal joint, which is adapted to be connected to a transfer case. One end of the connecting shaft is sleeved on the input shaft, and the other end is sleeved on the output shaft. An internal spline is arranged on the connecting shaft. The first external spline is connected to the internal spline to enable the input shaft to slide and telescopically move along the length direction of the connecting shaft. The second external spline is connected to the internal spline to enable the output shaft to slide and telescopically move along the length direction of the connecting shaft.

[0006] According to the drive shaft assembly of the present utility model, by providing a first external spline on the input shaft, a second external spline on the output shaft, and an internal spline on the connecting shaft, the first external spline is connected to the internal spline, and the second external spline is connected to the internal spline, so that the input shaft and the output shaft can slide telescopically along the length direction of the connecting shaft. Moreover, the input shaft is connected to the first universal joint, the first universal joint is adapted to be nestedly connected to the main reducer, the output shaft is connected to the second universal joint, and the second universal joint is adapted to be nestedly connected to the transfer case. Such a setting can enable the drive shaft assembly to transmit the power between the main reducer and the transfer case, and can also enable the first universal joint and the second universal joint to adjust the spatial angle of the drive shaft assembly, and can enable the drive shaft assembly to be free from the requirements of dynamic balance verification and equipment limitations, thereby saving the assembly steps and time of the whole vehicle, shortening the axial dimension of the drive shaft assembly, saving the layout space of the whole vehicle, further increasing the size of the battery pack, and improving the power and endurance of the battery pack.

[0007] In some examples of the present utility model, the first external spline, the second external spline, and the internal spline are all straight keys extending along the axial direction of the input shaft, so that the input shaft and the output shaft slide linearly along the length direction of the connecting shaft.

[0008] In some examples of the present utility model, the drive shaft assembly further includes: a limiting member, which is arranged between the outer periphery of the output shaft and the inner periphery of the connecting shaft, so that the connecting shaft and the output shaft are in limit fit in the axial direction of the output shaft.

[0009] In some examples of the present utility model, a limiting groove is formed on the connecting shaft, and the limiting member is arranged in the limiting groove.

[0010] In some examples of the present utility model, the input shaft includes: a limiting section and a connecting section. The first external spline is arranged on the limiting section, the connecting shaft is sleeved on the limiting section, the connecting section is connected to one end of the limiting section away from the connecting shaft, and the connecting section is connected to the first universal joint.

[0011] In some examples of the present utility model, a first connecting portion is arranged at one end of the connecting section away from the limiting section, a second connecting portion is arranged at one end of the output shaft away from the input shaft, the first connecting portion is connected to the first universal joint, and the second connecting portion is connected to the second universal joint.

[0012] In some examples of the present utility model, a first spline is arranged on the inner periphery of the first universal joint, a second spline is arranged on the outer periphery of the first connecting portion, and the first spline and the second spline are in interference fit; and / or a third spline is arranged on the inner periphery of the second universal joint, a fourth spline is arranged on the outer periphery of the second connecting portion, and the third spline and the fourth spline are in interference fit.

[0013] In some examples of the present utility model, the first universal joint is one of a cross universal joint and a constant velocity universal joint; and / or the second universal joint is one of a cross universal joint and a constant velocity universal joint.

[0014] In some examples of the present utility model, the transmission shaft assembly further includes: a seal, the seal is disposed at the connection between the first external spline and the internal spline, and / or at the connection between the second external spline and the internal spline.

[0015] The vehicle according to the present utility model includes: the above-mentioned transmission shaft assembly, a main reducer, and a transfer case, the main reducer is connected to the first universal joint, and the transfer case is connected to the second universal joint.

[0016] Compared with the prior art, the present utility model adopts a method of arranging a first external spline on the input shaft, a second external spline on the output shaft, and an internal spline on the connecting shaft, connecting the first external spline with the internal spline, and connecting the second external spline with the internal spline, so that the input shaft and the output shaft can slide and telescopic along the length direction of the connecting shaft. Moreover, the input shaft is connected to the first universal joint, the first universal joint is suitable for nested connection with the main reducer, the output shaft is connected to the second universal joint, and the second universal joint is suitable for nested connection with the transfer case. Such an arrangement can enable the transmission shaft assembly to transmit the power between the main reducer and the transfer case, and can also enable the first universal joint and the second universal joint to adjust the spatial angle of the transmission shaft assembly, and can enable the transmission shaft assembly to be free from the requirements and equipment limitations of dynamic balance verification, thereby saving the assembly steps and time of the whole vehicle, shortening the axial dimension of the transmission shaft assembly, saving the layout space of the whole vehicle, further increasing the size of the battery pack, and improving the power and endurance of the battery pack.

[0017] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a schematic structural diagram of a transmission shaft assembly according to an embodiment of the present utility model;

[0020] Figure 2 is a partial structural schematic diagram of a transmission shaft assembly according to an embodiment of the present utility model;

[0021] Figure 3 is a schematic structural diagram of an input shaft;

[0022] Figure 4It is a schematic structural diagram of the output shaft.

[0023] Reference numerals:

[0024] 100, drive shaft assembly;

[0025] 10, input shaft; 11, first external spline; 12, limiting section; 13, connecting section; 14, first connecting portion; 15, second spline; 20, output shaft; 21, second external spline; 22, second connecting portion; 23, fourth spline; 30, connecting shaft; 40, first universal joint; 50, second universal joint; 60, limiting member. Detailed implementation manners

[0026] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0027] Below, reference is made to Figures 1 - 4 Describe the drive shaft assembly 100 according to an embodiment of the present invention. The drive shaft assembly 100 is applied to a vehicle. For example, a new energy vehicle.

[0028] As Figures 1 - 4 shown, the drive shaft assembly 100 according to the present invention includes: an input shaft 10, an output shaft 20, and a connecting shaft 30. A first external spline 11 is provided on the input shaft 10. One end of the input shaft 10 is connected to a first universal joint 40. The first universal joint 40 is adapted to be connected to the main reducer. A second external spline 21 is provided on the output shaft 20. One end of the output shaft 20 is connected to a second universal joint 50. The second universal joint 50 is adapted to be connected to the transfer case. One end of the connecting shaft 30 is sleeved on the input shaft 10, and the other end is sleeved on the output shaft 20. An internal spline is provided on the connecting shaft 30. The first external spline 11 is connected to the internal spline so that the input shaft 10 slides and expands along the length direction of the connecting shaft 30. The second external spline 21 is connected to the internal spline so that the output shaft 20 slides and expands along the length direction of the connecting shaft 30.

[0029] It can be understood that the input shaft 10, the output shaft 20, and the connecting shaft 30 constitute the main structure of the drive shaft assembly 100. The input shaft 10, the output shaft 20, and the connecting shaft 30 are all cylindrical. The input shaft 10 and the output shaft 20 are both solid structures. The connecting shaft 30 is a hollow structure. One end of the input shaft 10 away from the output shaft 20 is connected to the first universal joint 40. The first universal joint 40 is nested and connected to the main reducer, so that the drive shaft assembly 100 can be connected to the main reducer. One end of the output shaft 20 away from the input shaft 10 is connected to the second universal joint 50. The second universal joint 50 is nested and connected to the transfer case, so that the drive shaft assembly 100 can be connected to the transfer case, and thus it is convenient for the drive shaft assembly 100 to transmit the power between the main reducer and the transfer case.

[0030] Wherein, a first external spline 11 is provided on the outer periphery of the input shaft 10, a second external spline 21 is provided on the outer periphery of the output shaft 20, and an internal spline is provided on the inner periphery of the connecting shaft 30. Both ends of the connecting shaft 30 are respectively sleeved on the input shaft 10 and the output shaft 20, so that the first external spline 11 can be connected to the internal spline, and the second external spline 21 can be connected to the internal spline, thereby enabling the input shaft 10 to slide and expand along the length direction of the connecting shaft 30, and enabling the output shaft 20 to slide and expand along the length direction of the connecting shaft 30.

[0031] Moreover, the first universal joint 40 and the input shaft 10 are connected as a whole, and the second universal joint 50 and the output shaft 20 are connected as a whole. Such a setting can avoid the drive shaft assembly 100 being restricted by the equipment, and can also enable the drive shaft assembly 100 not to require separate dynamic balance verification. Thus, the axial length of the drive shaft assembly 100 can be reduced to within 500 mm, which can make the drive shaft assembly 100 not subject to the requirements of dynamic balance verification and equipment restrictions, can also save the assembly steps and time of the whole vehicle, and can save the layout space of the whole vehicle. Furthermore, the boundary of the battery pack can be increased, and the power and endurance of the battery pack can be improved.

[0032] Therefore, by providing the first external spline 11 on the input shaft 10, the second external spline 21 on the output shaft 20, and the internal spline on the connecting shaft 30, and connecting the first external spline 11 to the internal spline and the second external spline 21 to the internal spline, the input shaft 10 and the output shaft 20 can slide and expand along the length direction of the connecting shaft 30. Moreover, the input shaft 10 is connected to the first universal joint 40, the first universal joint 40 is adapted to be nested and connected to the main reducer, the output shaft 20 is connected to the second universal joint 50, and the second universal joint 50 is adapted to be nested and connected to the transfer case. Such a setting can enable the drive shaft assembly 100 to transmit the power between the main reducer and the transfer case, can also enable the first universal joint 40 and the second universal joint 50 to adjust the spatial angle of the drive shaft assembly 10, and can enable the drive shaft assembly 100 not to be subject to the requirements of dynamic balance verification and equipment restrictions. Thus, the assembly steps and time of the whole vehicle can be saved, the axial dimension of the drive shaft assembly 100 can be shortened, the layout space of the whole vehicle can be saved, and furthermore, the size of the battery pack can be increased, and the power and endurance of the battery pack can be improved.

[0033] In particular, as Figures 2 - 4 shown, the first external spline 11, the second external spline 21, and the internal spline are all straight keys extending along the axial direction of the input shaft 10, so that the input shaft 10 and the output shaft 20 slide linearly along the length direction of the connecting shaft 30.

[0034] It can be understood that the first external spline 11, the second external spline 21, and the internal spline are all straight keys extending along the axial direction of the input shaft 10. Such a setting facilitates the connection between the first external spline 11 and the internal spline, and the connection between the second external spline 21 and the internal spline. It also enables relative movement between the first external spline 11 and the internal spline, and relative movement between the second external spline 21 and the internal spline. Thus, the input shaft 10 can linearly slide along the length direction of the connecting shaft 30, and the output shaft 20 can linearly slide along the length direction of the connecting shaft 30, thereby shortening the axial length of the transmission shaft assembly 100.

[0035] In addition, as Figure 4 shown, the transmission shaft assembly 100 further includes a limiting member 60. The limiting member 60 is arranged between the outer periphery of the output shaft 20 and the inner periphery of the connecting shaft 30 to enable limit fitting between the connecting shaft 30 and the output shaft 20 in the axial direction of the output shaft 20.

[0036] That is to say, the limiting member 60 is located on the outer periphery of the connecting shaft 30, and the limiting member 60 is sleeved on the connecting shaft 30. When one end of the connecting shaft 30 is sleeved on the output shaft 20, the limiting member 60 is located between the output shaft 20 and the connecting shaft 30. Thus, the position between the connecting shaft 30 and the output shaft 20 can be fixed, and the connecting shaft 30 and the output shaft 20 can be limit-fitted in the axial direction of the output shaft 20, further facilitating the installation and assembly of the transmission shaft assembly 100. For example, the limiting member 60 is one of a circlip, a clamp, and a rubber ring, thus facilitating the limiting of the output shaft 20 and the connecting shaft 30 by the limiting member 60.

[0037] Among them, as Figure 4 shown, a limiting groove is formed on the connecting shaft 30, and the limiting member 60 is arranged in the limiting groove. Such a setting facilitates the arrangement of the limiting member 60 on the connecting shaft 30, thereby facilitating the fixation between the connecting shaft 30 and the output shaft 20 through the limiting member 60, and further facilitating the installation and assembly of the transmission shaft assembly 100.

[0038] In addition, as Figure 2 and Figure 3 shown, the input shaft 10 includes a limiting section 12 and a connecting section 13. The first external spline 11 is arranged on the limiting section 12. The connecting shaft 30 is sleeved on the limiting section 12. The connecting section 13 is connected to one end of the limiting section 12 away from the connecting shaft 30, and the connecting section 13 is connected to the first universal joint 40.

[0039] It can be understood that the limiting section 12 and the connecting section 13 form the main structure of the input shaft 10. The limiting section 12 and the connecting section 13 are axially connected. The first external spline 11 is provided on the limiting section 12. After the connecting shaft 30 is sleeved on the limiting section 12, the first external spline 11 is connected to the internal spline, so as to facilitate the connection between the connecting shaft 30 and the input shaft 10. One end of the connecting section 13 far from the axis of the limiting section 12 is connected to the first universal joint 40, so that the input shaft 10 can be connected to the first universal joint 40. The first universal joint 40 is nested and connected to the main reducer, and further the drive shaft assembly 100 can be connected to the main reducer.

[0040] Among them, as Figure 2 and Figure 3 shown, a first connecting portion 14 is provided at one end of the connecting section 13 far from the limiting section 12, and a second connecting portion 22 is provided at one end of the output shaft 20 far from the input shaft 10. The first connecting portion 14 is connected to the first universal joint 40, and the second connecting portion 22 is connected to the second universal joint 50.

[0041] That is to say, a first connecting portion 14 is provided at one end of the connecting section 13 far from the limiting section 12. The first connecting portion 14 is connected to the first universal joint 40, and the first universal joint 40 is nested and connected to the main reducer, so that the drive shaft assembly 100 can be connected to the main reducer. A second connecting portion 22 is provided at one end of the output shaft 20 far from the input shaft 10. The second connecting portion 22 is connected to the second universal joint 50, and the second universal joint 50 is nested and connected to the transfer case, so that the drive shaft assembly 100 can be connected to the transfer case. Such a setting not only facilitates the drive shaft assembly 100 to transmit power between the main reducer and the transfer case, but also enables the drive shaft assembly 100 not to require a separate dynamic balance verification, thus facilitating the relative distance between the first universal joint 40 and the input shaft 10 and the second universal joint 50 and the output shaft 20, and further the axial length of the drive shaft assembly 100 can be shortened according to the actual situation.

[0042] In addition, as Figure 1 shown, a first spline is provided on the inner circumference of the first universal joint 40, and a second spline 15 is provided on the outer circumference of the first connecting portion 14. The first spline and the second spline 15 are in interference fit; a third spline is provided on the inner circumference of the second universal joint 50, and a fourth spline 23 is provided on the outer circumference of the second connecting portion 22. The third spline and the fourth spline 23 are in interference fit.

[0043] It can be understood that a first spline is provided on the inner circumference of the first universal joint 40, and a second spline 15 is provided on the outer circumference of the first connecting portion 14. The first spline and the second spline 15 are in interference fit. Such a setting can connect the first universal joint 40 and the input shaft 10 into a whole. When the axial length of the drive shaft assembly 100 changes, the first universal joint 40 and the input shaft 10 move together, thereby improving the accuracy of the length of the drive shaft assembly 100. A third spline is provided on the inner circumference of the second universal joint 50, and a fourth spline 23 is provided on the outer circumference of the second connecting portion 22. The third spline and the fourth spline 23 are in interference fit. Such a setting can connect the second universal joint 50 and the output shaft 20 into a whole. When the axial length of the drive shaft assembly 100 changes, the second universal joint 50 and the output shaft 20 move together, thereby improving the accuracy of the length of the drive shaft assembly 100, and further shortening the axial dimension of the drive shaft assembly 100 and increasing the boundary of the battery pack.

[0044] Alternatively, the first universal joint 40 and the first connecting portion 14 are integrally formed, and the second universal joint 50 and the second connecting portion 22 are integrally formed. Such a setting can connect the first universal joint 40 and the input shaft 10 into a whole, and connect the second universal joint 50 and the output shaft 20 into a whole. When the axial length of the drive shaft assembly 100 changes, the first universal joint 40 and the input shaft 10 move together, and the second universal joint 50 and the output shaft 20 move together, thereby improving the accuracy of the length of the drive shaft assembly 100, and further shortening the axial dimension of the drive shaft assembly 100 and increasing the boundary of the battery pack.

[0045] Optionally, as Figure 1 shown, the first universal joint 40 is one of a cross universal joint and a constant velocity universal joint; the second universal joint 50 is one of a cross universal joint and a constant velocity universal joint. It can be understood that the first universal joint 40 and the second universal joint 50 can be a cross universal joint or a constant velocity universal joint, and are selected according to the dynamic maximum angle of the specific vehicle model, so as to ensure that the drive shaft assembly 100 transmits the power between the main reducer and the transfer case. When relative movement occurs between the main reducer and the transfer case, the first universal joint 40 and the second universal joint 50 can adjust the angle, facilitating the transmission of power in the vehicle.

[0046] In addition, the drive shaft assembly 100 further includes: a seal, which is provided at the connection between the first external spline 11 and the internal spline and at the connection between the second external spline 21 and the internal spline. That is to say, a seal is provided at the connection between the first external spline 11 and the internal spline, and a seal is also provided at the connection between the second external spline 21 and the internal spline. Such a setting can prevent liquid or gas from entering the connecting shaft 30 through the connection, thereby ensuring the performance of the drive shaft assembly 100 and extending the service life of the drive shaft assembly 100.

[0047] A vehicle according to the present utility model includes: the drive shaft assembly 100 of the above embodiment, a main reducer, and a transfer case. The main reducer is connected to the first universal joint 40, and the transfer case is connected to the second universal joint 50. By providing a first external spline 11 on the input shaft 10, a second external spline 21 on the output shaft 20, and an internal spline on the connecting shaft 30, the first external spline 11 is connected to the internal spline, and the second external spline 21 is connected to the internal spline, so that the input shaft 10 and the output shaft 20 can slide and expand along the length direction of the connecting shaft 30. Moreover, the input shaft 10 is connected to the first universal joint 40, the first universal joint 40 is adapted to be nested and connected to the main reducer, the output shaft 20 is connected to the second universal joint 50, and the second universal joint 50 is adapted to be nested and connected to the transfer case. Such a setting can enable the drive shaft assembly 100 to transmit the power between the main reducer and the transfer case, and can also enable the first universal joint 40 and the second universal joint 50 to adjust the spatial angle of the drive shaft assembly, and can enable the drive shaft assembly 100 to be free from the requirements of dynamic balance verification and equipment limitations. Thus, the assembly steps and time of the whole vehicle can be saved, the axial dimension of the drive shaft assembly 100 can be shortened, the layout space of the whole vehicle can be saved, the boundary of the battery pack can be increased, and the power and endurance of the battery pack can be improved.

[0048] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 utility model.

[0049] In the description of the present utility model, the "first feature" and the "second feature" may include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. In the description of the present utility model, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature.

[0050] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" 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 utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0051] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A transmission shaft assembly (100), characterized in that: include: An input shaft (10), wherein a first external spline (11) is arranged on the input shaft (10), one end of the input shaft (10) is connected to a first universal joint (40), and the first universal joint (40) is suitable for being connected to a main reducer; An output shaft (20), wherein a second external spline (21) is arranged on the output shaft (20), one end of the output shaft (20) is connected to a second universal joint (50), and the second universal joint (50) is suitable for being connected to a transfer case; A connecting shaft (30), one end of the connecting shaft (30) is sleeved on the input shaft (10), and the other end is sleeved on the output shaft (20), an internal spline is arranged on the connecting shaft (30), the first external spline (11) is connected to the internal spline, so that the input shaft (10) can slide and retract along the length direction of the connecting shaft (30), and the second external spline (21) is connected to the internal spline, so that the output shaft (20) can slide and retract along the length direction of the connecting shaft (30).

2. The transmission shaft assembly (100) according to claim 1, characterized in that: The first external spline (11), the second external spline (21) and the internal spline are all straight keys extending along the axial direction of the input shaft (10), so that the input shaft (10) and the output shaft (20) can slide linearly along the length direction of the connecting shaft (30).

3. The transmission shaft assembly (100) according to claim 1, characterized in that: Also includes: A limit member (60) is disposed between the outer periphery of the output shaft (20) and the inner periphery of the connecting shaft (30) so that the connecting shaft (30) and the output shaft (20) are matched at an axial upper limit position of the output shaft (20).

4. The transmission shaft assembly (100) according to claim 3, characterized in that: A limiting groove is formed on the connecting shaft (30), and the limiting member (60) is arranged in the limiting groove.

5. The transmission shaft assembly (100) according to claim 1, characterized in that: The input shaft (10) comprises: A limiting section (12), wherein the first external spline (11) is arranged on the limiting section (12), and the connecting shaft (30) is sleeved on the limiting section (12); A connecting section (13), the connecting section (13) being connected to an end of the limiting section (12) away from the connecting shaft (30), and the connecting section (13) being connected to the first universal joint (40).

6. The transmission shaft assembly (100) according to claim 5, characterized in that: A first connecting portion (14) is provided at one end of the connecting section (13) away from the limiting section (12), and a second connecting portion (22) is provided at one end of the output shaft (20) away from the input shaft (10); the first connecting portion (14) is connected to the first universal joint (40), and the second connecting portion (22) is connected to the second universal joint (50).

7. The transmission shaft assembly (100) according to claim 6, characterized in that: A first spline is arranged on the inner periphery of the first universal joint (40), a second spline (15) is arranged on the outer periphery of the first connecting portion (14), and the first spline and the second spline (15) are interference fit; and / or A third spline is arranged on the inner periphery of the second universal joint (50), and a fourth spline (23) is arranged on the outer periphery of the second connecting portion (22), and the third spline and the fourth spline (23) are interference fit.

8. The transmission shaft assembly (100) according to claim 1, characterized in that: The first universal joint (40) is one of a cross universal joint and a constant velocity universal joint; and / or The second universal joint (50) is one of a cross universal joint and a constant velocity universal joint.

9. The transmission shaft assembly (100) according to claim 1, characterized in that: Also includes: A sealing member is provided at a connection between the first external spline (11) and the internal spline, and / or at a connection between the second external spline (21) and the internal spline.

10. A vehicle, characterized in that: include: The transmission shaft assembly (100) according to any one of claims 1 to 9; A main reducer connected to the first universal joint (40); A transfer case is connected to the second universal joint (50).

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