Transmission shaft, driving assembly and vehicle

Abstract

The utility model relates to a transmission shaft, a driving assembly and a vehicle, the transmission shaft comprises a shaft body, and the shaft body is of a cylindrical structure with an inner cavity; a first spline structure is arranged on the inner cavity wall of the shaft body in the circumferential direction, and the small diameter of the first spline structure is smaller than the diameter of the inner cavity wall. An oil blocking part is arranged on the inner cavity wall of the shaft body in the circumferential direction, the oil blocking part and the first spline structure are arranged at intervals in the axial direction of the shaft body, and an oil storage area is formed between the oil blocking part and the first spline structure. By arranging the oil blocking part in the inner cavity of the transmission shaft, a thick lubricating oil layer can be formed in an oil storage area, the amount of lubricating oil reaching a spline pair is increased, the lubricating effect on the spline pair is guaranteed, the situation that a spline structure is abraded in the high-speed operation process is reduced, and the service life is prolonged; and pollution to lubricating oil caused by metal filings generated by abrasion can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a transmission shaft, a drive assembly and a vehicle. BACKGROUND

[0002] The transmission connection through the spline pair is a relatively common transmission connection mode between two shafts, such as the connection between the main shaft of a motor and the input shaft of a reducer. For example, the drive assembly of a vehicle includes a motor, a reducer and a motor controller, wherein the main shaft of the motor is connected to the input shaft of the reducer through a spline pair to realize power transmission. A high-speed motor is one of the development directions of the electric drive assembly in recent years. The motor speed can reach 14000 rpm to 20000 rpm. However, with the increase of the motor speed, the requirement for reducing the running wear of the spline pair is further improved, which poses a great challenge to the lubrication of the spline connecting the motor main shaft and the reducer input shaft.

[0003] Due to manufacturing and assembly tolerances and bearing play, there is relative axial movement between the inner and outer spline structure surfaces of the reducer input shaft and the motor main shaft during operation. In the process of high-speed rotation, the lubricating oil adheres to the inner cavity wall of the input shaft under the action of centrifugal force. Since the small diameter of the inner spline of the input shaft is smaller than the inner diameter of the input shaft, the amount of lubricating oil reaching the inner spline is small, and the spline pair is not lubricated enough. The insufficient lubrication of the spline pair will cause abnormal wear of the spline structure surface, and in severe cases, it will even cause burn on the spline structure surface, affecting the service life. In addition, the metal debris after the wear of the spline structure surface will pollute the lubricating oil, thereby affecting the normal operation of other components lubricated by the lubricating oil, such as gears, bearings and other high-speed rotating parts.

[0004] Therefore, for the coaxial transmission connection mode through the spline pair, how to ensure the lubrication effect of the spline pair, reduce the spline wear during high-speed operation, improve the service life, and avoid the pollution of the lubricating oil caused by wear is a technical problem that needs to be solved by those skilled in the art. Utility model content

[0005] The purpose of the present application is to provide a transmission shaft, a drive assembly and a vehicle. By providing an oil retaining portion in the inner cavity of the transmission shaft, a lubricating oil layer with a relatively large thickness can be formed in the oil storage area, the amount of lubricating oil reaching the spline pair is improved, the lubrication effect of the spline pair is ensured, the spline structure wear during high-speed operation is reduced, the service life is improved, and the pollution of the lubricating oil caused by the metal debris generated by wear is avoided.

[0006] To solve the above technical problems, the application provides a transmission shaft, which comprises a shaft body, wherein the shaft body is in a cylindrical structure provided with an inner cavity; a first spline structure is arranged on the inner cavity wall of the shaft body in a circumferential direction, and the minor diameter of the first spline structure is smaller than the diameter of the inner cavity wall; an oil retaining portion is arranged on the inner cavity wall of the shaft body in a circumferential direction, and the oil retaining portion and the first spline structure are arranged in a spaced manner along the axial direction of the shaft body, and an oil storage area is formed between the oil retaining portion and the first spline structure.

[0007] In the transmission shaft provided by the application, the inner cavity wall is further provided with an oil retaining portion arranged in a spaced manner along the axial direction of the inner cavity and forming an oil storage area between the oil retaining portion and the first spline structure. After the oil supply portion supplies oil, the lubricating oil can enter the oil storage area between the oil retaining portion and the first spline structure. The oil retaining portion can provide a blocking action on the lubricating oil in the oil storage area, so that the thickness of the oil layer formed in the oil storage area is increased, and more lubricating oil is accumulated. In the rotating process of the transmission shaft, the amount of lubricating oil in the oil storage area reaching the spline pair is increased, so that the lubricating effect on the spline pair is ensured, and the condition that the spline pair is greatly worn and the service life is reduced due to insufficient lubrication is avoided. Moreover, the metal chips generated by the wear of the surface of the spline structure can also pollute the lubricating oil, and then the lubricating oil polluted in this way can damage the spline structure or other components lubricated by the lubricating oil, such as bearings, gears, etc.

[0008] Meanwhile, the increased amount of lubricating oil reaching the spline pair can also improve the cooling effect of the spline pair through the lubricating oil, so that the stable operation of the spline pair is ensured, and the service life is prolonged. Moreover, the overall lubricating effect of the spline pair is good, and the purpose of shock absorption and noise reduction can also be effectively achieved.

[0009] Optionally, the oil retaining portion is further provided with an oil leakage hole, and the minimum distance between the oil leakage hole and the inner cavity wall in the radial direction of the shaft body is not less than the spacing between the inner edge of the first spline structure and the inner cavity wall.

[0010] Optionally, the oil retaining portion is an oil retaining ring, the inner diameter of the oil retaining ring is not greater than the minor diameter of the first spline structure, and the inner hole of the oil retaining ring forms the oil leakage hole.

[0011] Optionally, the oil retaining ring and the shaft body are in an integrally formed structure.

[0012] Optionally, the outer peripheral wall of the oil retaining ring is in interference fit with the inner cavity wall.

[0013] Optionally, the inner cavity wall is provided with a mounting groove in a circumferential direction, the outer diameter of the oil retaining ring is greater than the inner diameter of the inner cavity wall, and the outer edge of the oil retaining ring is embedded in the mounting groove.

[0014] Optionally, the oil retaining portion is further provided with an oil guiding hole in communication with the oil storage area.

[0015] Optionally, the oil blocking part is a metal conductive ring, the metal conductive ring is electrically connected with the shaft body, and the metal conductive ring is further used for electrically connecting with a metal oil guide pipe passing through the oil guide hole.

[0016] The application further provides a driving assembly, comprising a driving part and a transmission part, one of the driving part and the transmission part is provided with the transmission shaft as described above, and the other is provided with a matching shaft, the matching shaft is provided with a second spline structure, the first spline structure of the transmission shaft and the second spline structure form a spline pair, and the transmission shaft and the matching shaft are drivingly connected through the spline pair.

[0017] The application further provides a vehicle comprising the driving assembly as described above.

[0018] The driving assembly with the transmission shaft as described above and the vehicle with the driving assembly have similar technical effects to the transmission shaft, and details are not repeated here for the sake of brevity. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a sectional view of the driving assembly provided by the embodiment of the application in the radial direction of the transmission shaft;

[0020] Figure 2 is Figure 1 is an enlarged view of A in FIG. 1;

[0021] Figure 3 is a sectional view of the driving assembly in the axial direction when the oil blocking part is an oil blocking ring;

[0022] Figure 4 is Figure 3 is a structural schematic view of the transmission shaft in FIG. 2;

[0023] Figure 5 is a sectional view of the driving assembly in the axial direction when the oil blocking part is a metal conductive ring;

[0024] Figure 6 is a simulation diagram of the distribution of lubricating oil in the running state of the driving assembly.

[0025] The accompanying drawings are briefly described as follows: Figures 1-6 In the drawings, the reference signs are explained as follows:

[0026] 1 transmission shaft, 11 shaft body, 12 inner cavity, 13 first spline structure, 14 oil blocking part, 141 oil leakage hole;

[0027] 2 matching shaft, 21 second spline structure, 22 cavity part;

[0028] 3 oil guide part, 31 oil guide seat, 32 oil guide pipe;

[0029] 4 spline pair;

[0030] 5 first bearing;

[0031] 6 second bearing. DETAILED DESCRIPTION

[0032] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0033] The embodiment provides a transmission shaft, the transmission shaft 1 is provided with a shaft body 11, the shaft body 11 is a cylindrical structure with an inner cavity 12, a first spline structure 13 is arranged on the inner cavity wall of the shaft body 11 in the circumferential direction, the transmission shaft 1 can be coaxially connected with another matched shaft 2, the outer wall of the matched shaft 2 is provided with a second spline structure 21 in the circumferential direction, the end of the matched shaft 2 is inserted into the inner cavity 12 of the shaft body 11, as shown in Figure 1 and Figure 2 The first spline structure 13 and the second spline structure 21 cooperatively form a spline pair 4, and the transmission shaft 1 and the matched shaft 2 are coaxially connected through the spline pair 4.

[0034] In actual power transmission, due to manufacturing and assembly tolerances and bearing play, the transmission shaft 1 and the matched shaft 2 can have relative movement in the axial direction, which is easy to cause wear on the surface of the spline structure and affect the service life, therefore, it is necessary to provide lubricating oil for the spline pair 4, and the lubricating oil can be introduced into the inner cavity 12 of the shaft body 11, and the lubricating oil can reach the spline pair 4 along the inner cavity wall, so as to ensure the lubricating effect of the spline pair 4, reduce wear and prolong the service life.

[0035] As shown in Figure 2 and Figure 4 The first spline structure 13 forms a tooth end at a small diameter B, forms a tooth groove at a large diameter C, the second spline structure 21 forms a tooth end at a large diameter G, forms a tooth groove at a small diameter F, and a gap E is formed between the first spline structure 13 and the second spline structure 21, due to process limitations, as shown in Figure 4 The small diameter D2 of the first spline structure 13 is often smaller than the inner diameter D1 of the inner cavity 12, under the action of centrifugal force during high-speed rotation of the transmission shaft 1, the lubricating oil in the inner cavity 12 of the shaft body 11 tightly adheres to the inner cavity wall of the shaft body 11, and the oil layer is thin, the excess lubricating oil will flow out along the inner cavity wall, so that the amount of lubricating oil reaching the small diameter B of the first spline structure 13 is small, and for the transmission shaft 1 with the large diameter of the first spline structure 13 smaller than the inner diameter D1 of the inner cavity 12, the amount of lubricating oil reaching the spline pair 4 is even smaller.

[0036] The insufficient lubrication of the spline pair 4 can cause abnormal wear of the surfaces of the first spline structure 13 and the second spline structure 21, and even cause burn of the surfaces of the spline structures, and cause more serious vibration and noise, and the metal chips after the wear of the surfaces of the spline structures can contaminate the lubricating oil, thereby affecting the normal operation of the high-speed rotating parts such as gears and bearings.

[0037] To solve the above problems, in the transmission shaft 1 provided in the embodiment, the inner cavity wall is further provided with an oil blocking part 14 in the circumferential direction, the oil blocking part 14 is arranged in the axial direction of the inner cavity 12 and spaced from the first spline structure 13, and an oil storage area is formed between the two. After the oil supply part supplies oil, the lubricating oil can enter the oil storage area between the oil blocking part 14 and the first spline structure 13. The oil blocking part 14 can provide a blocking effect on the lubricating oil in the oil storage area, so that the thickness of the oil layer formed in the oil storage area increases and more lubricating oil is accumulated. During the rotation of the transmission shaft 1, the amount of lubricating oil in the oil storage area reaching the spline pair 4 increases, which ensures the lubrication effect of the spline pair 4, avoids the case that the spline pair 4 is greatly worn due to insufficient lubrication and reduces the service life, and also avoids the case that the metal chips generated by the wear of the surfaces of the spline structures contaminate the lubricating oil, thereby avoiding the damaged spline structures or other components lubricated by the lubricating oil, such as bearings, gears, etc.

[0038] At the same time, the increased amount of lubricating oil reaching the spline pair 4 can also improve the cooling effect of the spline pair 4 through the lubricating oil, ensure the stable operation of the spline pair 4, and prolong the service life. In addition, the overall lubrication effect of the spline pair 4 is good, which can also effectively achieve the purpose of shock absorption and noise reduction.

[0039] In the embodiment, the first spline structure 13 preferably adopts involute spline, and the tooth profile of the involute spline is involute. Correspondingly, the second spline structure 21 also adopts involute spline. Of course, the first spline structure 13 can also adopt spline with rectangular or trapezoidal cross-section, which is not limited here. When the first spline structure 13 adopts involute spline, it can have high transmission efficiency and low contact stress, and is suitable for high-speed transmission.

[0040] Further, the oil retaining portion 14 is also provided with a drain hole 141, when the amount of lubricating oil in the oil storage area is excessive, the lubricating oil can be drained through the drain hole 141, avoiding the accumulation of oil, and the lubricating oil drained through the drain hole 141 can be discharged into the oil collecting shell and the like, so as to be recycled and utilized, reducing waste and improving economy. The minimum distance between the drain hole 141 and the inner cavity wall in the radial direction of the shaft body 11 is not less than the distance between the inner edge of the first spline structure 13 and the inner cavity wall. In this way, the thickness of the oil layer in the oil storage area can reach the small diameter of the first spline structure when the transmission shaft 1 is running at high speed, further ensuring that the lubricating oil in the oil storage area can reach the small diameter B of the first spline structure 13, and ensuring the overall lubrication effect of the spline pair 4.

[0041] As shown in Figure 3 and Figure 5 , the lubricating oil introduced into the inner cavity 12 of the shaft body 11 by the oil guide portion 3 can be in close contact with the side wall of the oil storage area in the running state, and flows from the oil storage area to the spline pair 4, lubricates and cools the spline pair 4 after passing through the spline pair 4, and is finally discharged through the gap between the transmission shaft 1 and the matching shaft 2. The excess lubricating oil in the oil storage area is discharged to the outside of the transmission shaft 1 through the drain hole 141, so as to be recycled and utilized.

[0042] In this embodiment, the specific structure of the oil retaining portion 14 is not limited, for example, the oil retaining portion 14 can be provided as an oil retaining ring, the inner hole of the oil retaining ring forms the above-mentioned drain hole 141, and the inner diameter D3 of the oil retaining ring is not greater than the small diameter D2 of the first spline structure 13, so as to ensure that a relatively thick lubricating oil layer can be formed in the oil storage area, and the lubrication effect of the spline pair 4 is ensured.

[0043] Of course, the oil retaining portion 14 can also be provided as a baffle plate, and the baffle plate is provided with a drain hole 141, and the oil retaining portion 14 is provided as an annular oil retaining ring, which can reduce the overall weight and achieve lightweight.

[0044] The oil retaining ring can be an integral structure with the shaft body 11, and specifically, when the shaft body 11 is machined, the inner cavity wall of the shaft body 11 is formed with an annular boss in the circumferential direction, and the annular boss forms the above-mentioned oil retaining ring. In this way, the number of parts can be reduced, and the installation operation is simplified.

[0045] The oil retaining ring can also be a structure independent of the shaft body 11, and the oil retaining ring is installed in the inner cavity 12 of the shaft body 11. In this way, the machining process of the shaft body 11 is simplified, and the oil retaining ring can be provided as a standard part, which is suitable for mass production and effectively reduces the cost.

[0046] Specifically, the outer wall surface of the oil blocking ring is in interference fit with the inner cavity wall, and the oil blocking ring is installed to the inner cavity 12 through press fitting, at this time, the oil blocking ring can be a plastic part, a metal part or a rubber part, etc. An annular mounting groove can also be provided on the inner cavity wall of the shaft body 11 in the circumferential direction, the outer diameter of the oil blocking ring is greater than the inner diameter of the inner cavity wall, the oil blocking ring is deformed by extrusion and installed into the mounting groove, and then the shape of the oil blocking ring is restored, at this time, the outer diameter of the oil blocking ring is embedded in the mounting groove, and the oil blocking ring can be selected from a plastic part or a rubber part, etc.

[0047] The oil blocking part 14 is also provided with an oil guiding hole which is in communication with the oil storage area and is used for introducing lubricating oil into the oil storage area. The oil guiding part 3 includes an oil guiding seat 31 which is provided with an oil guiding channel, which can be in communication with the oil guiding hole at the outlet of the oil guiding channel, and the lubricating oil in the oil guiding channel enters the oil guiding hole and is introduced into the oil storage area from the oil guiding hole, or as shown in Figure 3 , the oil guiding seat 31 passes through the oil guiding hole, and the lubricating oil in the oil guiding channel can directly enter the oil storage area, or as shown in Figure 5 , the oil guiding part 3 further includes an oil guiding pipe 32 which is arranged in the oil guiding seat 31, one end of the oil guiding pipe 32 is in communication with the oil guiding channel, and the other end passes through the oil guiding hole, and the lubricating oil in the oil guiding channel can enter the oil storage part through the oil guiding pipe 32, and the arrangement of the oil guiding pipe 32 can improve the flexibility of the oil guiding part 3, reduce the requirements for the positional relationship between the oil guiding part 3 and the oil blocking part 14, and have good flexibility.

[0048] Of course, during oil supply, the oil supply part can also supply oil through the cooperating shaft 2, as shown in Figure 3 and Figure 5 , the cooperating shaft 2 is provided in a hollow structure, and oil is supplied through the side of the cooperating shaft 2 away from the transmission shaft 1, and the lubricating oil enters the oil storage area along the cavity 22 of the cooperating shaft 2 and then reaches the spline pair 4 from the oil storage area.

[0049] When the oil blocking part 14 is an oil blocking ring, the inner hole of the oil blocking ring can form the above-mentioned oil guiding hole, and the overall structure is relatively simple.

[0050] In this embodiment, the oil blocking part 14 can also be a metal conductive ring, the outer peripheral wall of the metal conductive ring is in interference fit with the inner cavity wall of the shaft body 11, and the metal conductive ring is also used for electrical connection with the grounding part, so as to realize the effect of grounding the transmission shaft 1 while realizing the oil blocking effect.

[0051] In this embodiment, the specific structure of the grounding part is not limited. For example, the grounding part can be formed through the oil guiding part 3. Specifically, the oil guiding tube 32 of the oil guiding part 3 is a metal oil guiding tube, which is disposed on the oil guiding seat 31. The oil guiding seat 31 can provide support for the oil guiding tube 32. One end of the oil guiding tube 32 is connected to the oil guiding channel, and the other end passes through the inner ring of the metal conductive ring. The metal conductive ring is also electrically connected to the oil guiding tube 32 through a carbon brush. Then, the oil guiding tube 32 is electrically connected to the shell through the oil guiding seat 31, and grounding is achieved through the shell. This arrangement simplifies the overall structure and eliminates the need for additional grounding connection components. The metal oil guiding tube can be electrically connected to the shell through a connecting wire. Alternatively, the oil guiding seat 31 can be made of metal, with the oil guiding tube 32 and the oil guiding seat 31 electrically connected, and the oil guiding seat 31 and the shell electrically connected, thus forming a grounding part to achieve grounding.

[0052] This embodiment also provides a drive assembly, which includes a drive unit and a transmission unit. The transmission unit includes the aforementioned drive shaft 1, and the drive unit includes a mating shaft 2. When the drive unit is a motor, the main shaft of the motor forms the mating shaft 2. The mating shaft 2 is provided with a second spline structure 21. The first spline structure 13 and the second spline structure 21 of the drive shaft 1 form a spline pair 4. The drive shaft 1 and the mating shaft 2 are connected by the spline pair 4. The drive unit can drive the drive shaft 1 to rotate through the mating shaft 2, thereby realizing power transmission.

[0053] Of course, the drive unit can include the aforementioned transmission shaft 1, and the transmission unit can include the mating shaft 2. When the drive unit is a motor, the aforementioned transmission shaft 1 is the main shaft of the motor. No specific restrictions are made here.

[0054] like Figure 3 and Figure 5 As shown, the transmission part also includes a first bearing 5, and the drive part also includes a second bearing 6. The first bearing 5 is used to support and install the transmission shaft 1, and the second bearing 6 is used to support and install the mating shaft 2.

[0055] By providing an oil baffle 14 inside the drive shaft 1, the oil layer thickness in the oil reservoir area can be increased, thereby increasing the amount of lubricating oil reaching the spline pair 4. This ensures effective lubrication of the spline pair 4 and prevents excessive wear and reduced service life due to insufficient lubrication. It also prevents metal shavings from contaminating the lubricating oil due to surface wear of the spline structure, thus avoiding damage to the spline structure or other lubricated components such as bearings and gears. Simultaneously, the increased amount of lubricating oil reaching the spline pair 4 improves the cooling effect, ensuring stable operation and extending service life. Furthermore, the overall good lubrication of the spline pair 4 effectively reduces vibration and noise.

[0056] The embodiment also provides a vehicle, which comprises the driving assembly and is also beneficial to improving the NVH (Noise, Vibration, Harshness) performance of the vehicle.

[0057] The main shaft of the motor of the driving assembly forms the matching shaft 2, and the input shaft of the speed reducer forms the transmission shaft 1. The transmission shaft 1 and the matching shaft 2 are connected in transmission through the spline pair 4. The oil guide part 3 supplies oil into the inner cavity of the transmission shaft 1 from the side of the speed reducer. The oil guide part 3 comprises an oil guide base 31 and an oil guide pipe 32. The oil blocking part 14 is a metal conductive ring. The outer ring of the metal conductive ring is electrically connected with the transmission shaft 1 and rotates with the transmission shaft 1. The metal conductive ring is electrically connected with the oil guide pipe 32 through a carbon brush. The metal conductive ring is also provided with an oil leakage hole 141. During operation, the oil guide part 3 supplies oil into the oil storage area of the inner cavity 12 of the shaft body 11 through the oil guide pipe 32. With the high-speed rotation of the transmission shaft 1, the distribution of the lubricating oil is shown as the green area in the figure. It can be seen that the amount of lubricating oil in the oil storage area is relatively large, which indicates that the thickness of the oil layer of the lubricating oil in the oil storage area is relatively large due to the arrangement of the oil blocking part 14, and there is also enough amount of lubricating oil at the position of the spline pair 4, thereby ensuring the lubricating effect of the lubricating oil on the spline pair 4.

[0058] In the description of the present application, it should be understood that the terms “thickness”, “inner”, “outer”, “axial”, “radial”, “circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0059] In addition, the terms “first” and “second” are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “a plurality of” is two or more, unless otherwise specifically limited.

[0060] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, a number of improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A propeller shaft, characterized in that The shaft body (11) is a cylindrical structure provided with an inner cavity (12); The inner cavity wall of the shaft body (11) is provided with a first spline structure (13), and the minor diameter of the first spline structure (13) is smaller than the diameter of the inner cavity wall; The inner cavity wall of the shaft body (11) is provided with an oil blocking portion (14) in the circumferential direction, and the oil blocking portion (14) and the first spline structure (13) are arranged in the axial direction of the shaft body (11) and form an oil storage area therebetween.

2. The propeller shaft of claim 1, wherein The oil blocking portion (14) is further provided with an oil discharge hole (141), and the minimum distance between the oil discharge hole (141) and the inner cavity wall in the radial direction of the shaft body (11) is not less than the spacing between the inner edge of the first spline structure (13) and the inner cavity wall.

3. The propeller shaft of claim 2, wherein, The oil blocking portion (14) is an oil blocking ring, and the inner diameter of the oil blocking ring is not greater than the minor diameter of the first spline structure (13), and the inner hole of the oil blocking ring forms the oil discharge hole (141).

4. The propeller shaft of claim 3, wherein The oil blocking ring and the shaft body (11) are integrally formed.

5. The propeller shaft of claim 3 wherein, The outer peripheral wall of the oil blocking ring is in interference fit with the inner cavity wall.

6. The propeller shaft of claim 3 wherein, The inner cavity wall is provided with a mounting groove in the circumferential direction, the outer diameter of the oil blocking ring is greater than the inner diameter of the inner cavity wall, and the outer edge of the oil blocking ring is embedded in the mounting groove.

7. The propeller shaft of claim 1 or 2, wherein The oil blocking portion (14) is further provided with an oil guide hole in communication with the oil storage area.

8. The propeller shaft of claim 7, wherein, The oil blocking portion (14) is a metal conductive ring, which is electrically connected with the shaft body (11), and is further used for electrically connecting with a metal oil guide pipe (32) passing through the oil guide hole.

9. A drive assembly characterized by, The drive assembly comprises a driving part and a transmission part, one of which is provided with the transmission shaft according to any one of claims 1-8, and the other is provided with a matching shaft (2) provided with a second spline structure (21), the first spline structure (13) of the transmission shaft and the second spline structure (21) form a spline pair (4), and the transmission shaft and the matching shaft (2) are drivingly connected through the spline pair (4).

10. A vehicle characterized by comprising: The drive assembly comprises a driving part and a transmission part, one of which is provided with the transmission shaft according to any one of claims 1-8, and the other is provided with a matching shaft (2) provided with a second spline structure (21), the first spline structure (13) of the transmission shaft and the second spline structure (21) form a spline pair (4), and the transmission shaft and the matching shaft (2) are drivingly connected through the spline pair (4). The drive assembly comprises a driving part and a transmission part, one of which is provided with the transmission shaft according to any one of claims 1-8, and the other is provided with a matching shaft (2) provided with a second spline structure (21), the first spline structure (13) of the transmission shaft and the second spline structure (21) form a spline pair (4), and the transmission shaft and the matching shaft (2) are drivingly connected through the spline pair (4).

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