Protective sleeve and electric drive assembly

Abstract

The utility model provides a protective sleeve and an electric drive assembly. The protective sleeve is used for protecting a section of transmission shaft, exposed out of a shell of the electric drive assembly, in the electric drive assembly, the protective sleeve comprises a containing cavity and a sleeve opening, and one containing cavity is communicated with the outside through one sleeve opening. Wherein one containing cavity is used for containing a section of transmission shaft, and the cavity wall of the other containing cavity comprises a flexible material. Each sleeve opening comprises an annular elastic piece, and each annular elastic piece is used for being arranged on a transmission shaft in a sleeving mode. The sleeve opening and the containing cavity of the protective sleeve can adapt to the sizes of transmission shafts, exposed out of the shell, of different electric drive assemblies through deformation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, in particular to a protective sleeve and an electric drive assembly. BACKGROUND

[0002] One section of the transmission shaft in the electric drive assembly is exposed to the shell of the electric drive assembly to output the power of the driving motor. In the process of selling or transferring the electric drive assembly, a protective sleeve is needed to protect the transmission shaft exposed to the shell. However, the sizes of the transmission shafts of different models of electric drive assemblies are different, and the protective sleeve in the prior art cannot effectively protect the transmission shafts in different models of electric drive assemblies. Usually, the protective sleeve needs to be customized according to different models of electric drive assemblies. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a protective sleeve and an electric drive assembly. One sleeve opening and one receiving cavity of the protective sleeve can adapt to the size of one section of the transmission shaft exposed to the shell of different electric drive assemblies through deformation.

[0004] In a first aspect, the present application provides a protective sleeve. The protective sleeve is used to protect one section of the transmission shaft exposed to the shell of the electric drive assembly. The protective sleeve comprises one receiving cavity and one sleeve opening. One receiving cavity is in communication with the outside through one sleeve opening. One receiving cavity is used to accommodate one section of the transmission shaft. The cavity wall of one receiving cavity comprises a flexible material. One sleeve opening comprises an annular elastic member. One annular elastic member is used to be sleeved on one section of the transmission shaft.

[0005] The protective sleeve provided by the present application is fixed to the outer circumferential surface of one section of the transmission shaft through one sleeve opening. The cavity wall of one receiving cavity adapts to the outer diameter size of one section of the transmission shaft of different electric drive assemblies through the deformation of the flexible material. One sleeve opening generates elastic deformation through one annular elastic member to adapt to the outer diameter size of one section of the transmission shaft of different electric drive assemblies, thereby expanding the application range of the protective sleeve provided by the present application. The protective sleeve provided by the present application can be applied to multiple different models of electric drive assemblies, and can reliably fix and fit one section of the transmission shaft with different outer diameter sizes to ensure the protection effect.

[0006] In one implementation manner, the inner diameter of one annular elastic member in a natural state is smaller than the outer diameter of one section of the transmission shaft.

[0007] In the present implementation manner, the inner diameter of one annular elastic member in a natural state is smaller. When one sleeve opening is sleeved on one section of the transmission shaft, one annular elastic member generates elastic deformation to ensure that one sleeve opening is reliably fixed and fitted with the outer circumferential surface of one section of the transmission shaft.

[0008] In an implementation, the circumference of the annular elastic member is greater than or equal to half of the length of the protective sleeve along the axial direction of the annular elastic member and less than or equal to twice the length of the protective sleeve along the axial direction of the annular elastic member.

[0009] In the implementation, for different models of the electric drive assembly, the ratio of the outer diameter of the spline section of the transmission shaft to the length of the spline section is within a preset range. The ratio of the outer diameter of the spline section of the transmission shaft to the outer diameter of the remaining part of the transmission shaft is also within another preset range. The ratio of the circumference of the annular elastic member to the length of the protective sleeve along the axial direction of the annular elastic member is limited based on the two preset ranges, so as to ensure that the protective sleeve is adapted to the length of the spline section of the transmission shaft and the outer diameter of the remaining part of the transmission shaft.

[0010] In an implementation, the length of the annular elastic member along the axial direction of the annular elastic member is less than half of the length of the protective sleeve.

[0011] In the implementation, for different models of the electric drive assembly, the length of the spline section of the transmission shaft accounts for a preset range of the length of the transmission shaft. The length of the annular elastic member is limited based on the preset range, so as to ensure that the length of the protective sleeve along the axial direction of the annular elastic member is adapted to the length of the remaining part of the transmission shaft and is reliably fixed.

[0012] In an implementation, the cavity wall of the accommodation cavity includes a rustproof layer and a buffer layer stacked together, the rustproof layer is used to form the inner cavity wall of the accommodation cavity, and the buffer layer is used to form the outer cavity wall of the accommodation cavity.

[0013] In the implementation, the rustproof layer can form a rustproof effect on the transmission shaft accommodated in the accommodation cavity. The buffer layer can form a buffer effect of preventing collision on the transmission shaft accommodated in the accommodation cavity.

[0014] In an implementation, the buffer layer includes a plurality of bubbles, the plurality of bubbles are arranged along the planar direction of the buffer layer, and the distance between any two adjacent bubbles is less than the radius of the bubble.

[0015] In the implementation, the plurality of bubbles are independent of each other and have a small interval along the planar direction of the buffer layer, and the buffer layer has a good protection effect on the transmission shaft. The protection function of the remaining bubbles will not be affected when a single bubble is damaged.

[0016] In an implementation, the rustproof layer is attached to the buffer layer, and the plurality of bubbles of the buffer layer protrude from the surface of the buffer layer facing the rustproof layer.

[0017] In the present implementation, the plurality of air bubbles protrude towards the interior of the accommodating cavity, which can increase the coating area of the anti-rust layer and improve the anti-rust effect of the protective sleeve on the transmission shaft.

[0018] In one implementation, the protective sleeve comprises a ring-shaped flexible member, the ring-shaped flexible member is arranged to be fixed to the inner cavity wall of the accommodating cavity, the axis of the ring-shaped flexible member coincides with the axis of the ring-shaped elastic member, and the inner diameter of the ring-shaped flexible member is greater than the inner diameter of the ring-shaped elastic member and less than twice the inner diameter of the ring-shaped elastic member.

[0019] In the present implementation, the ring-shaped flexible member is arranged to be sleeved on the outer side of the spline section to support the protective sleeve and further provide buffering protection for the spline section.

[0020] In one implementation, along the axial direction of the ring-shaped elastic member, the spacing distance between the ring-shaped flexible member and the ring-shaped elastic member is less than or equal to half the length of the protective sleeve.

[0021] In the present implementation, for different models of electric drive assemblies, the length of the spline section of the transmission shaft is within a preset range at the position of the transmission shaft. Based on the preset range, the spacing distance between the ring-shaped flexible member and the ring-shaped elastic member along the axial direction of the ring-shaped elastic member is limited, which can ensure that the ring-shaped flexible member is aligned with the spline section along the axial direction of the ring-shaped elastic member.

[0022] In one implementation, the protective sleeve comprises another ring-shaped flexible member, the other ring-shaped flexible member is arranged to be fixed to the inner cavity wall of the accommodating cavity and is arranged to be spaced apart from the ring-shaped flexible member away from the ring-shaped elastic member along the axial direction of the ring-shaped elastic member, and the axis of the other ring-shaped flexible member coincides with the axis of the ring-shaped flexible member.

[0023] In the present implementation, the axial length of the spline section is relatively long. The protective sleeve provided by the present application is supported by two or more ring-shaped flexible members, which can improve the structural stability of the protective sleeve and provide better buffering protection for the spline section.

[0024] In one implementation, along the axial direction of the ring-shaped elastic member, the spacing distance between the other ring-shaped flexible member and the ring-shaped flexible member is greater than the spacing distance between the ring-shaped flexible member and the ring-shaped elastic member.

[0025] In the present implementation, the axial length of the spline section is relatively long. By increasing the spacing distance between the two or more ring-shaped flexible members, better buffering protection can be provided for the entire spline section along the axial direction of the spline section.

[0026] In an implementation, the protective sleeve comprises a plurality of connectors, each of which is used to fix one annular flexible member and another annular flexible member along the axial direction of one annular elastic member, and the plurality of connectors are arranged along the circumferential direction of one annular elastic member.

[0027] In the implementation, the two or more annular flexible members are connected by the plurality of connectors, so that the structural stability of the protective sleeve provided by the application is further improved, and better buffering protection is provided for the spline section.

[0028] In an implementation, the protective sleeve comprises a positioning protrusion, and the positioning protrusion comprises opposite two ends along the axial direction of one annular elastic member, one end of which is used to be fixed to the inner side cavity wall of one accommodating cavity, and the other end is used to extend towards one sleeve opening.

[0029] In the implementation, the end surface of one section of the transmission shaft along the axial direction of the transmission shaft comprises an axial recess. The axial recess can be used as a center hole to facilitate the processing of the spline section. The protective sleeve provided by the application is embedded in the axial recess through a positioning protrusion, so that the protective sleeve is fixed to one section of the transmission shaft away from one sleeve opening, and the relative position between the protective sleeve provided by the application and one section of the transmission shaft is further ensured, and the protection effect on the spline section is improved.

[0030] In an implementation, along the radial direction of one annular elastic member, the outer diameter of one end of a positioning protrusion is greater than the outer diameter of the other end and less than half of the inner diameter of one annular elastic member.

[0031] In the implementation, the positioning protrusion is formed in a conical shape to adapt to the difference in the inner diameter of the axial recess of each transmission shaft in different models of electric drive assemblies.

[0032] In an implementation, one sleeve opening comprises an annular end cover, the annular end cover is used to surround the periphery of one annular elastic member along the radial direction of one annular elastic member, and the outer diameter of the annular end cover is greater than or equal to twice the inner diameter of one annular elastic member.

[0033] In the implementation, the annular end cover is used to shield the bearing hole on the shell of the electric drive assembly, so that foreign matter cannot enter between the inner ring and the outer ring of the motor bearing of the electric drive assembly from the bearing hole, and the protection effect of the protective sleeve provided by the application on the electric drive assembly is improved.

[0034] In a second aspect, the application provides an electric drive assembly, which comprises a transmission shaft and the protective sleeve provided by any of the implementations of the first aspect. One section of the transmission shaft is exposed to the shell of the electric drive assembly for transmission connection with the wheel. The protective sleeve is attached to and fixed to the outer peripheral surface of one section of the transmission shaft through one sleeve opening.

[0035] The electric drive assembly provided by the application protects the exposed part of the transmission shaft from the shell by the protective sleeve provided by any of the above implementation manners. In the process of selling or transferring the electric drive assembly, the protective sleeve can form good rust prevention effect and buffer protection effect on the exposed part of the transmission shaft from the shell.

[0036] In an implementation manner, the part of the transmission shaft along the axial direction of the transmission shaft includes a spline section and a cylindrical section, the outer diameter of the spline section is greater than the outer diameter of the cylindrical section, the spline section is used to connect the part of the transmission shaft in the shell through the cylindrical section, and the sleeve opening is used to fit the outer circumferential surface of the cylindrical section. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0038] Figure 1 A schematic diagram of the electric drive assembly provided in an embodiment of the application;

[0039] Figure 2 A partial enlarged structural schematic diagram of the electric drive assembly provided in an embodiment of the application;

[0040] Figure 3 A partial enlarged structural schematic diagram of the electric drive assembly provided in an embodiment of the application;

[0041] Figure 4 A partial enlarged structural schematic diagram of the electric drive assembly provided in an embodiment of the application;

[0042] Figure 5 A partial structural schematic diagram of the electric drive assembly provided in an embodiment of the application;

[0043] Figure 6 A schematic diagram of the protective sleeve provided in an embodiment of the application;

[0044] Figure 7 A cross-sectional schematic diagram of the protective sleeve provided in an embodiment of the application;

[0045] Figure 8 A manufacturing flowchart of the protective sleeve provided in an embodiment of the application;

[0046] Figure 9 A partial cross-sectional enlarged structural schematic diagram of the electric drive assembly provided in an embodiment of the application;

[0047] Figure 10 Fig. 6 is a partial cross-sectional view of the electric drive assembly according to another embodiment of the present application;

[0048] Figure 11 Fig. 7 is a partial cross-sectional view of the protective sleeve according to another embodiment of the present application;

[0049] Figure 12 Fig. 8 is a cross-sectional view of the protective sleeve according to an embodiment of the present application;

[0050] Figure 13 Fig. 9 is a partial cross-sectional view of the electric drive assembly according to another embodiment of the present application;

[0051] Figure 14 Fig. 10 is a partial cross-sectional view of the electric drive assembly according to another embodiment of the present application;

[0052] Figure 15 Fig. 11 is a partial cross-sectional view of the electric drive assembly according to another embodiment of the present application;

[0053] Figure 16 Fig. 12 is a partial cross-sectional view of the electric drive assembly according to another embodiment of the present application.

[0054] Fig. 300 is an electric drive assembly; 301 is a housing; 302 is a driving motor; 200 is a transmission shaft; 201 is a first section of the transmission shaft; 202 is a spline section; 203 is a cylindrical section; 204 is an axial groove; 303 is a speed reducer; 304 is a bearing hole; 100 is a protective sleeve; 11 is a receiving cavity; 12 is an anti-rust layer; 13 is a buffer layer; 131 is a bubble; 131a is a first bubble; 131b is a second bubble; 20 is a sleeve opening; 30 is an annular elastic member; 40 is an annular flexible member; 41 is a first annular flexible member; 42 is a second annular flexible member; 50 is a connecting member; 60 is a positioning protrusion; 61 is a first end; 62 is a second end; 70 is an annular end cover. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0056] The application provides a protective sleeve. The protective sleeve is used for protecting a transmission shaft exposed from a shell of an electric drive assembly. The protective sleeve comprises a receiving cavity and a sleeve opening. The receiving cavity is in communication with the outside through the sleeve opening. One of the receiving cavities is used for accommodating the transmission shaft. The cavity wall of the receiving cavity comprises a flexible material. The sleeve opening comprises an annular elastic member. The annular elastic member is used for sleeving the transmission shaft. The sleeve opening and the receiving cavity of the protective sleeve can be deformed to adapt to the size of the transmission shaft exposed from the shell of different electric drive assemblies.

[0057] The application provides an electric drive assembly. The electric drive assembly comprises a transmission shaft and the protective sleeve. One of the transmission shafts is exposed from the shell of the electric drive assembly and is used for drivingly connecting the wheels. The protective sleeve is attached to and fixed to the outer circumferential surface of the transmission shaft through the sleeve opening. The electric drive assembly has good rust prevention effect and buffering protection effect during the process of sale or transportation.

[0058] Please see the schematic diagram of the electric drive assembly provided in one embodiment of the application shown in Figure 1

[0059] As shown in Figure 1 The electric drive assembly 300 provided by the application comprises a shell 301 and a transmission shaft 200. The transmission shaft 200 is used for being partially accommodated and fixed in the shell 301 and is connected with the transmission member in the shell 301. One of the transmission shafts 200 is used for being exposed from the shell 301 so as to drive the wheels. That is, the electric drive assembly 300 outputs the driving force through one of the transmission shafts 200. The other of the transmission shafts 200 is located in the shell 301.

[0060] For example, the electric drive assembly 300 provided by the application comprises a driving motor 302 and a speed reducer 303. The motor shaft of the driving motor 302 is used for drivingly connecting the input shaft of the speed reducer 303. The driving motor 302 is used for driving the input shaft of the speed reducer 303 to rotate through the motor shaft. The transmission shaft 200 is drivingly connected with the output shaft or the output wheel of the speed reducer 303 so as to output the driving force of the driving motor 302.

[0061] For example, the motor stator of the driving motor 302 is fixed in the shell 301. The motor stator is used for driving the motor rotor and driving the motor shaft to rotate. The shell 301 is also used for accommodating the plurality of transmission wheels of the speed reducer 303. The input shaft of the speed reducer 303 transmits the driving force to the transmission shaft 200 and outputs the driving force to the outside through the meshing of the plurality of transmission wheels.

[0062] In one embodiment, the transmission shaft 200 can directly serve as the motor shaft of the driving motor 302 and is exposed from the shell 301 and outputs the driving force of the driving motor 302 to the outside.

[0063] ​For the convenience of introduction, the part of the transmission shaft 200 extending out of the housing 301 is defined as the first part of the transmission shaft 201 in the subsequent embodiments of the present application. The first part of the transmission shaft 201 is used to extend out of the housing 301 to output the driving force of the driving motor 302. It can be understood that the first part of the transmission shaft 201 includes a transmission structure, such as a spline, for driving connection with the rear-end transmission member. Before the electric drive assembly 300 of the present application is drivingly connected with the rear-end transmission member, the transmission structure on the first part of the transmission shaft 201 is exposed outside the housing 301.

[0064] Please refer to Figure 2 the partial enlarged structural schematic view of the electric drive assembly provided in an embodiment of the present application, and Figure 3 the partial enlarged structural schematic view of the electric drive assembly provided in an embodiment of the present application.

[0065] As Figure 2 and Figure 3 shown, along the axial direction of the transmission shaft 200, the first part of the transmission shaft 201 of the transmission shaft 200 includes a spline section 202 and a cylindrical section 203. The outer diameter of the spline section 202 is greater than the outer diameter of the cylindrical section 203. The spline section 202 is used to connect the part of the transmission shaft 200 located inside the housing 301 through the cylindrical section 203.

[0066] The cylindrical section 203 of the transmission shaft 200 is used to receive the driving force of the driving motor 302 and rotate following the rotor of the driving motor 302. The cylindrical section 203 is also used to connect the spline section 202. The spline section 202 is used to be drivingly connected with the rotor of the driving motor 302 through the cylindrical section 203. In the working process of the electric drive assembly 300 provided in the present application, the spline section 202 is used to be drivingly connected with the rear-end transmission member. The spline section 202 is used to output the driving force of the rotor of the driving motor 302 towards the rear-end transmission member outside the housing 301 and drive the wheels to rotate through the rear-end transmission member.

[0067] Corresponding to the embodiment in which the transmission shaft 200 directly serves as the motor shaft of the driving motor 302, the rear-end transmission member can include a gear assembly in an external speed reducer.

[0068] In an embodiment, the electric drive assembly 300 provided in the present application outputs the driving force through the speed reducer 303, that is, the transmission shaft 200 is drivingly connected with the transmission wheel or transmission shaft of the speed reducer 303. The speed reducer 303 includes an input shaft for driving connection with the motor shaft of the driving motor 302. The housing 301 includes a bearing hole 304 for fixing the outer ring of a bearing, and the inner ring of the bearing is used to be sleeved on the outer circumferential surface of the transmission shaft 200. The first part of the transmission shaft 201 of the transmission shaft 200 extends out of the bearing hole 304.

[0069] Please refer to Figure 4A partial enlarged view of the electric drive assembly provided in an embodiment of the present application is shown in Figure 5 A partial exploded view of the electric drive assembly provided in an embodiment of the present application is shown in

[0070] As shown in Figure 4 and Figure 5 The electric drive assembly 300 provided in the present application comprises a protective sleeve 100. The protective sleeve 100 is used to protect the first section of the transmission shaft 201 of the transmission shaft 200 exposed outside the housing 301. The protective sleeve 100 provided in the present application comprises a receiving cavity 11 and a sleeve opening 20. The protective sleeve 100 is made of flexible material, and the protective sleeve 100 is used to enclose the receiving cavity 11, and the receiving cavity 11 is used to communicate with the outside through the sleeve opening 20.

[0071] The protective sleeve 100 of the electric drive assembly 300 in the present application is used to be sleeved on the first section of the transmission shaft 201 of the transmission shaft 200, and the receiving cavity 11 of the protective sleeve 100 is used to at least partially accommodate the transmission structure of the first section of the transmission shaft 201 of the transmission shaft 200. In Figure 3 and Figure 4 In the embodiment shown in

[0072] Please see the schematic view of the protective sleeve provided in an embodiment of the present application shown in Figure 6 and the cross-sectional view of the protective sleeve provided in an embodiment of the present application shown in Figure 7

[0073] As shown in Figure 6 and Figure 7 The sleeve opening 20 of the protective sleeve 100 provided in the present application is used to be fixedly attached to the outer periphery of the first section of the transmission shaft 201 to seal the receiving cavity 11. The sleeve opening 20 comprises an annular elastic member 30. The annular elastic member 30 is used to be sleeved on the first section of the transmission shaft 201.

[0074] ​The transmission shaft 200 exposed to the shell 301 of the electric drive assembly 300 is vulnerable to external environment during the process of sale or transfer. For example, dust, moisture or grease and other foreign matters can cause adverse effects on the transmission shaft 200, and the transmission shaft 200 is also vulnerable to being bumped by foreign matters. The transmission shaft 200 damaged by invasion will reduce the reliability, stability and service life of the electric drive assembly 300. The protective sleeve 100 is arranged to protect the first section transmission shaft 201 exposed to the shell 301, which can avoid the direct contact between the first section transmission shaft 201 and the outside during the process of sale or transfer of the electric drive assembly 300, prevent performance degradation due to oxidation, corrosion and other factors, and prevent damage to the first section transmission shaft 201 caused by foreign matter impact, thereby forming good dustproof effect, rustproof effect and buffering effect on the transmission shaft 200.

[0075] In one embodiment, the axis of the annular elastic member 30 is parallel to the opening direction of the sleeve opening 20.

[0076] In one embodiment, the inner diameter of the annular elastic member 30 in the natural state is smaller than the outer diameter of the first section transmission shaft 201. The inner diameter of the annular elastic member 30 in the natural state is small, and the annular elastic member 30 is elastically deformed when the sleeve opening 20 is sleeved on the first section transmission shaft 201, so as to ensure that the sleeve opening 20 is reliably fixed and fitted with the outer peripheral surface of the first section transmission shaft 201. Corresponding to the embodiment of the first section transmission shaft 201 including the spline section 202 and the cylindrical section 203, the receiving cavity 11 of the protective sleeve 100 is used to completely accommodate the spline section 202 and at least partially accommodate the cylindrical section 203. The sleeve opening 20 of the protective sleeve 100 is used to fit and fix the outer peripheral surface of the cylindrical section 203.

[0077] It should be noted that, Figure 6 The protective sleeve 100 shown is not the final form of the protective sleeve 100 of the present application, Figure 6 which is a structural schematic diagram of the protective sleeve 100 in the manufacturing process.

[0078] Please see Figure 8 which is a manufacturing process flowchart of the protective sleeve 100 provided in one embodiment of the present application.

[0079] As Figure 8 shown, the manufacturing process of the protective sleeve 100 of the present application includes: first, the protective sleeve 100 is expanded and enclosed to form the receiving cavity 11 by using the thermoplastic support; second, the annular elastic member 30 is sleeved on the sleeve opening 20; and then the edges of the sleeve opening 20 are folded toward the annular elastic member 30 and heat-bonded in sequence to fix the annular elastic member 30 and the sleeve opening 20. Since the cross-sectional shape of the thermoplastic support is square, the annular elastic member 30 is expanded and enclosed to form the receiving cavity 11 by using the thermoplastic support. Figure 6In the schematic view, the cross-sectional shape of the sleeve opening 20 and the annular elastic member 30 of the protective sleeve 100 in the direction perpendicular to the length direction of the protective sleeve 100 is also square. In the actual application of the protective sleeve 100, the cross-sectional shape of the sleeve opening 20 and the annular elastic member 30 in the direction perpendicular to the length direction of the protective sleeve 100 is matched with the cross-sectional shape of the transmission shaft 200. It can also be understood that when the protective sleeve 100 of the present application is used to protect the first section of the transmission shaft 201, the protective sleeve 100 is cylindrical, and the annular elastic member 30 is circular.

[0080] When the sleeve opening 20 is sleeved on the transmission shaft 200, the annular elastic member 30 can be elastically deformed, and the inner diameter of the annular elastic member 30 when matched with the transmission shaft 200 is approximately equal to the outer diameter of the cylindrical section 203 of the transmission shaft 200. The accommodation cavity 11 can fit the spline section 202 of the transmission shaft 200, and the sleeve opening 20 can be fixed to the outer peripheral surface of the cylindrical section 203 of the transmission shaft 200 through the annular elastic member 30.

[0081] In one embodiment, the cavity wall of the accommodation cavity 11 includes a rust-proof layer 12 and a buffer layer 13 stacked together, the rust-proof layer 12 is used to form the inner cavity wall of the accommodation cavity 11, and the buffer layer 13 is used to form the outer cavity wall of the accommodation cavity 11. That is, the rust-proof layer 12 is located on the inner surface of the accommodation cavity 11, and the buffer layer 13 is located on the side of the rust-proof layer 12 away from the accommodation cavity 11. The rust-proof layer 12 is used to form a rust-proof effect on the first section of the transmission shaft 201 exposed to the shell 301. The buffer layer 13 is used to form an anti-collision effect on the first section of the transmission shaft 201 exposed to the shell 301.

[0082] In one embodiment, the rust-proof layer 12 includes VCI (Volatil e Corrosion Inhibitor), a volatile rust inhibitor. When the protective sleeve 100 provided by the present application is used to protect the section of the transmission shaft exposed to the shell 301, the rust-proof particles in the VCI can be vaporized into gas and form a protective film on the outer surface of the section of the transmission shaft exposed to the shell 301, so as to cut off the possibility of contact between metal ions in the transmission shaft 200 and water, oxygen and the like, thereby achieving the rust-proof effect on the section of the transmission shaft exposed to the shell 301.

[0083] In an embodiment, the buffer layer 13 comprises a plurality of air bubbles 131 arranged along the planar direction of the buffer layer 13. When the protective sleeve 100 provided by the present application is used to protect the first section of the transmission shaft 201 exposed outside the housing 301, the plurality of air bubbles 131 can effectively absorb and disperse external impact forces, thereby playing a role of buffering and shock absorption, and effectively reducing the damage of the first section of the transmission shaft 201 exposed outside the housing 301 due to vibration, collision, etc. during sale or transportation.

[0084] The protective sleeve 100 provided by the present application is fixed to the outer circumferential surface of the first section of the transmission shaft 201 of the transmission shaft 200 through the sleeve opening 20. Among them, the sleeve opening 20 is elastically deformed by the annular elastic member 30 to adapt to the outer diameter size of the first section of the transmission shaft 201 of the transmission shaft 200 of different models, thereby expanding the application range of the protective sleeve 100 provided by the present application. That is, the protective sleeve 100 provided by the present application can be applied to a plurality of different models of electric drive assemblies 300, and can be reliably fixed to the first section of the transmission shaft 201 of the transmission shaft 200 with different outer diameter sizes.

[0085] For example, referring to Table 1, the protective sleeve 100 provided by the present application can be applied to several different models of electric drive assemblies 300 with different sizes of transmission shafts 200. The unit is mm.

[0086] Model 1 Model 2 Model 3 Model 4 Model 5 Model 6 Outer diameter of spline segment 26.5 21 21 31.4 31.4 31.4 Length of spline segment 20 20 20 19 20 20 Outer diameter of cylindrical segment 21 16 16 26 26 26 Length of cylindrical segment 30.6 30.6 30.6 17.6 38.4 30 Length of first segment of drive shaft 50.6 50.6 50.6 36.6 58.4 50

[0087] Table 1

[0088] The length of the protective sleeve 100 along the radial direction of the annular elastic member 30 is greater than the inner diameter of the annular elastic member 30 in the natural state, and the accommodation cavity 11 can be used to accommodate the end of the first section of the transmission shaft 201. Corresponding to the embodiment that the end of the transmission shaft 200 comprises the spline section 202, the outer diameter of the spline section 202 is generally greater than the outer diameter of the remaining part of the first section of the transmission shaft 201, that is, the radial length of the accommodation cavity 11 is greater to better accommodate the spline section 202. Or it can be understood that when the protective sleeve 100 provided by the present application is used to protect the transmission shaft 200, the radial size of the protective sleeve 100 along the transmission shaft 200 is greater than the radial size of the sleeve opening 20 along the transmission shaft 200. Therefore, the accommodation cavity 11 can better accommodate the spline section 202, and the sleeve opening 20 can be reliably fitted and fixed to the transmission shaft 200 and seal the accommodation cavity 11.

[0089] In an embodiment, along the circumferential direction of the annular elastic member 30, the circumference of the annular elastic member 30 is greater than or equal to half the length of the protective sleeve 100 along the axial direction of the annular elastic member 30, and less than or equal to twice the length of the protective sleeve 100 along the axial direction of the annular elastic member 30.

[0090] Please see Figure 9A partial cross-sectional enlarged structural schematic view of the electric drive assembly provided in an embodiment of the present application is shown.

[0091] In order to facilitate the introduction, the diameter of the annular elastic member 30 is defined as D1, and the length of the protective sleeve 100 along the axial direction of the annular elastic member 30 is defined as L1. Along the circumferential direction of the annular elastic member 30, the circumference of the annular elastic member 30 is π*D1. The relationship between the circumference of the annular elastic member 30 and the length L1 of the protective sleeve 100 along the axial direction of the annular elastic member 30 satisfies: L1 / 2≤π*D1≤2L1.

[0092] It can be understood that for different models of the electric drive assembly 300, the outer diameter of the spline section 202 of the transmission shaft 200 and the length of the spline section 202 are within a certain ratio range. The outer diameter of the spline section 202 of the transmission shaft 200 and the outer diameter of the remaining part of the first section of the transmission shaft 201 are within another ratio range. The outer diameter of the remaining part of the first section of the transmission shaft 201 of the transmission shaft 200 except the spline section 202 is approximately equal to the diameter of the annular elastic member 30. Thus, based on the above two ratio ranges, the diameter of the annular elastic member 30 and the length of the protective sleeve 100 along the axial direction of the annular elastic member 30 are limited, i.e., the circumference of the annular elastic member 30 and the length of the protective sleeve 100 along the axial direction of the annular elastic member 30 are limited, which can ensure that the protective sleeve 100 is adapted to the length of the spline section 202 of the transmission shaft 200 and the outer diameter of the remaining part of the first section of the transmission shaft 201.

[0093] Corresponding to the embodiment in which the first section of the transmission shaft 201 exposed to the housing 301 includes the spline section 202 and the cylindrical section 203, the relationship between the circumference of the annular elastic member 30 and the length L1 of the protective sleeve 100 along the axial direction of the annular elastic member 30 satisfies: L1 / 2≤π*D1≤2L1, so as to ensure that the annular elastic member 30 can be adapted to the cylindrical section 203, so as to ensure that the protective sleeve 100 can be better adapted to the length of the spline section 202 of the transmission shaft 200 and the outer diameter of the cylindrical section 203, and thus ensure the protection effect of the protective sleeve 100.

[0094] For example, the length of the protective sleeve 100 can be designed as 60mm, and the circumference of the annular elastic member 30 can be designed as 78mm. Thus, the protective sleeve 100 can achieve the protection effect for the first section of the transmission shaft 201 in the electric drive assembly 300 of model 1 to model 6, and is compatible with the outer diameter of the cylindrical section 203 in each of the above models.

[0095] In an embodiment, along the axial direction of the annular elastic member 30, the length of the annular elastic member 30 is less than half of the length of the protective sleeve 100.

[0096] Please see Figure 10A partial cross-sectional enlarged structure schematic view of the electric drive assembly provided in another embodiment of the present application is shown.

[0097] For ease of introduction, the length of the annular elastic member 30 along its own axial direction is defined as L2, and the length of the protective sleeve 100 along the axial direction of the annular elastic member 30 is defined as L3. Along the axial direction of the annular elastic member 30, the sum of the length L2 of the annular elastic member 30 along its own axial direction and the length L3 of the protective sleeve 100 is the length L1 of the protective sleeve 100. The relationship between the length L2 of the annular elastic member 30 along its own axial direction and the length L3 of the protective sleeve 100 along the axial direction of the annular elastic member 30 satisfies: L2≤L3 / 2.

[0098] It can be understood that for different models of the electric drive assembly 300, the length of the spline section 202 of the transmission shaft 200 accounts for a percentage of the length of the first section of the transmission shaft 201 within a preset range. Based on the preset range, the length of the annular elastic member 30 can be limited to ensure that the length of the protective sleeve 100 along the annular elastic member 30 is adapted to the length of the cylindrical section 203 in the first section of the transmission shaft 201 and can be reliably fixed. For example, the length of the protective sleeve 100 provided by the present application can be designed as 60 mm, and the length of the annular elastic member 30 can be designed as 20 mm. Thus, the length of the accommodation cavity 11 formed by the protective sleeve 100 can be adapted to the length of the spline section 202 in each of the above models, and the length of the annular elastic member 30 can be adapted to the length of the cylindrical section 203 in each of the above models.

[0099] In an embodiment, the plurality of air bubbles 131 of the buffer layer 13 are arranged at intervals along the planar direction of the buffer layer 13, and the distance between any two adjacent air bubbles 131 is less than the radius of one air bubble 131.

[0100] Please see Figure 11 A partial cross-sectional enlarged structure schematic view of the protective sleeve provided in another embodiment of the present application is shown, and Figure 12 A cross-sectional schematic view of the protective sleeve provided in an embodiment of the present application is shown.

[0101] For ease of introduction, any two adjacent air bubbles 131 are defined as a first air bubble 131a and a second air bubble 131b, the distance between the first air bubble 131a and the second air bubble 131b is defined as d, and the radius of each of the first air bubble 131a and the second air bubble 131b is r. The relationship between the distance d between the first air bubble 131a and the second air bubble 131b and the radius r of any one of the two air bubbles 131 satisfies: d

[0102] By limiting the spacing d between the first bubble 131a and the second bubble 131b to be smaller than the radius r of either of the bubbles 131, the plurality of bubbles 131 on the buffer layer 13 are arranged relatively densely. In the planar direction of the buffer layer 13, the plurality of bubbles 131 are independent of each other and have a small spacing distance. Thus, the protection effect of the buffer layer 13 on the first section of the transmission shaft 201 of the transmission shaft 200 is better. Moreover, the protection function of the remaining bubbles 131 is not affected when a single bubble 131 is damaged.

[0103] In an embodiment, along the thickness direction of the protective sleeve 100, the rust-proof layer 12 is attached to the buffer layer 13. The plurality of bubbles 131 of the buffer layer 13 are used to protrude towards the direction of the accommodation cavity 11.

[0104] As shown in Figure 11 and Figure 12 , the rust-proof layer 12 is attached to the inner surface of the buffer layer 13. The plurality of bubbles 131 are located on the inner surface of the buffer layer 13. That is, the plurality of bubbles 131 are used to protrude along the buffer layer 13 towards the direction of one accommodation cavity 11. It can be understood that, based on the rust-proof layer 12 being used to form the inner cavity wall of the accommodation cavity 11, the plurality of bubbles 131 of the buffer layer 13 are arranged to protrude towards the direction of the accommodation cavity 11, which can increase the surface area of the rust-proof layer 12, that is, can increase the coating area of the rust-proof layer 12, and improve the rust-proof effect of the protective sleeve 100 provided by the present application on one section of the transmission shaft 200.

[0105] In an embodiment, the protective sleeve 100 includes an annular flexible member 40, the annular flexible member 40 is used to be fixed to the inner cavity wall of the accommodation cavity 11, the axis of the annular flexible member 40 coincides with the axis of the annular elastic member 30, and the inner diameter of the annular flexible member 40 is greater than the inner diameter of the annular elastic member 30 and less than twice the inner diameter of the annular elastic member 30.

[0106] Please refer to Figure 13 for the partial cross-sectional enlarged structure schematic diagram of the electric drive assembly provided by another embodiment of the present application.

[0107] As shown in Figure 13 , the protective sleeve 100 provided by the present application includes an annular flexible member 40. Along the axial direction of the transmission shaft 200, the annular flexible member 40 is located on the side of the annular elastic member 30 away from the housing 301 of the electric drive assembly 300 provided by the present application. The annular flexible member 40 is used to be fixed to the inner cavity wall of the accommodation cavity 11. The inner diameter of the annular flexible member 40 is greater than the inner diameter of the annular elastic member 30. When the protective sleeve 100 provided by the present application is used to protect the first section of the transmission shaft 201 of the transmission shaft 200 exposed to the housing 301, the annular flexible member 40 is used to be sleeved on the outside of the spline section 202 of the transmission shaft 200 to support the protective sleeve 100. The annular flexible member 40 can also be used to further buffer and protect the spline section 202.

[0108] Because the outer diameter of the spline section 202 of the transmission shaft 200 and the outer diameter of the cylindrical section 203 are within a preset range, the inner diameter of the annular elastic member 30 is approximately equal to the outer diameter of the cylindrical section 203, by setting the inner diameter of the annular flexible member 40 to be greater than the inner diameter of the annular elastic member 30 and less than twice the inner diameter of the annular elastic member 30, it can avoid that the inner diameter of the annular flexible member 40 is too small, preventing the annular flexible member 40 from being excessively tight when it is sleeved on the spline section 202, thereby reducing the service life. It also avoids that the inner diameter of the annular flexible member 40 is too large, which affects the supporting effect of the annular flexible member 40 on the protective sleeve 100.

[0109] In an embodiment, along the axial direction of the annular elastic member 30, the spacing distance between the annular flexible member 40 and the annular elastic member 30 is less than or equal to half the length of the protective sleeve 100. For ease of introduction, along the axial direction of the annular elastic member 30, the spacing distance between the annular flexible member 40 and the annular elastic member 30 is defined as L4, and the length of the protective sleeve 100 is defined as L1. Wherein: L4≤L1 / 2.

[0110] For different models of electric drive assembly 300, the length of the spline section 202 of the transmission shaft 200 accounts for a proportion of the length of the first section transmission shaft 201 within a preset range. Based on the preset range to limit the spacing distance between the annular flexible member 40 and the annular elastic member 30 along the axial direction of the annular elastic member 30, it can be ensured that the annular flexible member 40 is aligned with the spline section 202 along the axial direction of the annular elastic member 30. In an embodiment, the protective sleeve 100 provided by the present application includes another annular flexible member 40, and the other annular flexible member 40 is arranged on the side away from the annular elastic member 30 along the axial direction of the annular elastic member 30. The axis of the other annular flexible member 40 coincides with the axis of the annular flexible member 40.

[0111] Please refer to Figure 14 the partial cross-sectional enlarged structure schematic diagram of the electric drive assembly provided in another embodiment of the present application.

[0112] For ease of introduction, one annular flexible member 40 is defined as a first annular flexible member 41, and the other annular flexible member 40 is defined as a second annular flexible member 42. The first annular flexible member 41 and the second annular flexible member 42 are both fixed to the inner side cavity wall of the receiving cavity 11. The first annular flexible member 41 and the second annular flexible member 42 are arranged in a spaced manner along the axial direction of the transmission shaft 200. The second annular flexible member 42 is located on the side away from the annular elastic member 30 of the first annular flexible member 41. The axis of the first annular flexible member 41 coincides with the axis of the second annular flexible member 42.

[0113] In this embodiment, since the axial length of the spline segment 202 is relatively long, the protective sleeve 100 is supported by two annular flexible members 40 arranged at intervals, which can improve the structural stability of the protective sleeve 100 and provide better buffer protection for the spline segment 202.

[0114] In some embodiments, the protective sleeve 100 provided in this application may include, but is not limited to, a first annular flexible member 41 and a second annular flexible member 42. Appropriately increasing the number of annular flexible members 40 can further enhance the supporting effect on the protective sleeve 100, further improve the structural stability of the protective sleeve 100, and provide better buffer protection for the spline segment 202.

[0115] In one embodiment, along the axial direction of the annular elastic member 30, the distance between the other annular flexible member 40 and the first annular flexible member 40 is greater than the distance between the first annular flexible member 40 and the annular elastic member 30. That is, along the axial direction of the annular elastic member 30, the distance between the second annular flexible member 42 and the first annular flexible member 41 is greater than the distance between the first annular flexible member 41 and the annular elastic member 30. Alternatively, it can be understood that along the axial direction of the annular elastic member 30, the first annular flexible member 41 is closer to the annular elastic member 30 than the second annular flexible member 42. It is understandable that, since the axial length of the spline segment 202 is relatively long, increasing the distance between the first annular flexible member 41 and the second annular flexible member 42 can provide a better buffering and protective effect for the spline segment 202 as a whole along its axial direction.

[0116] In one embodiment, the protective sleeve 100 provided in this application includes a plurality of connectors 50 along the axial direction of the annular elastic member 30. The opposite ends of each connector 50 are respectively used to fix one annular flexible member 40 and another annular flexible member 40. The plurality of connectors 50 are arranged at intervals along the circumference of the annular elastic member 30.

[0117] like Figure 14 As shown, there are multiple connectors 50 arranged circumferentially along the annular elastic member 30. Along the axial direction of the annular elastic member 30, the opposite ends of each connector 50 are used to fixally connect the first annular flexible member 41 and the second annular flexible member 42, respectively. By connecting and fixing the first annular flexible member 41 and the second annular flexible member 42 with multiple connectors 50, the structural stability of the protective sleeve 100 provided in this application can be further improved, and better buffer protection can be provided for the spline segment 202.

[0118] In one embodiment, the protective sleeve 100 includes a positioning protrusion 60. Along the axial direction of the annular elastic member 30, the positioning protrusion 60 includes two opposing ends, one end for fixing to the inner wall of the receiving cavity 11, and the other end for extending toward the sleeve opening 20.

[0119] Please refer to the above. Figure 15 The diagram shown is a partial enlarged cross-sectional view of the electric drive assembly provided in another embodiment of this application.

[0120] like Figure 15 As shown, the positioning protrusion 60 is used to receive and fix within the receiving cavity 11 of the protective sleeve 100. Along the axial direction of the annular elastic member 30, the positioning protrusion 60 includes a first end 61 and a second end 62. The first end 61 is used to fix to the inner wall of the receiving cavity 11, and the second end 62 extends towards the sleeve opening 20. That is, along the axial direction of the annular elastic member 30, the second end 62 of the positioning protrusion 60 is closer to the sleeve opening 20 than the first end 61. The positioning protrusion 60 is used to define the position between the protective sleeve 100 and the drive shaft 200 provided in this application.

[0121] Please see Figure 3 The drive shaft 200 includes an axial groove 204. The axial groove 204 is located on the end face of the drive shaft 200 along its own axial direction. The axial groove 204 is also located outside the housing 301. Alternatively, it can be understood that the end face of the first section of the drive shaft 201 exposed outside the housing 301 is recessed inward along the axial direction of the drive shaft 200 to form the axial groove 204. The axial groove 204 can serve as a center hole for the drive shaft 200 to facilitate the machining of structures such as the spline section 202. When the protective sleeve 100 provided in this application is fitted onto the first section of the drive shaft 201, the positioning protrusion 60 is used to embed into the axial groove 204 to define the relative position between the protective sleeve 100 and the drive shaft 200.

[0122] The positioning protrusion 60 is embedded in the axial groove 204 and abuts against the inner wall of the axial groove 204. This can fix the end of the protective sleeve 100 away from the sleeve opening 20 to the drive shaft 200, thereby reducing the relative displacement between the protective sleeve 100 and the first section of the drive shaft 201 of the drive shaft 200, and ensuring the protective effect of the protective sleeve 100 on the spline section 202.

[0123] In one embodiment, along the radial direction of the annular elastic member 30, the outer diameter of one end of the positioning protrusion 60 is greater than the outer diameter of the other end and less than half the inner diameter of the annular elastic member 30. That is, along the radial direction of the annular elastic member 30, the outer diameter of the first end 61 of the positioning protrusion 60 is greater than the outer diameter of the second end 62 and less than half the inner diameter of the annular elastic member 30.

[0124] Understandably, limiting the outer diameter of the second end 62 of the positioning protrusion 60 to be smaller than the outer diameter of the first end 61 facilitates reliable fixation of the positioning protrusion 60 to the axial groove 204 of the drive shaft 200. By limiting the outer diameter of the first end 61 of the positioning protrusion 60 to be less than half the inner diameter of the annular elastic member 30, the overall volume of the positioning protrusion 60 is indirectly limited, preventing the positioning protrusion 60 from occupying too much internal space of the receiving cavity 11.

[0125] In one embodiment, the positioning protrusions 60 are tapered in the radial direction of the annular elastic member 30, in the direction from the protective sleeve 100 to the sleeve mouth 20. In this way, the positioning protrusions 60 are formed in a conical shape to adapt to the inner diameter of the axial groove 204 of the transmission shaft 200 in different models of the electric drive assembly 300.

[0126] In one embodiment, the sleeve mouth 20 comprises an annular end cover 70, which is arranged around the periphery of the annular elastic member 30 in the radial direction of the annular elastic member 30. The outer diameter of the annular end cover 70 is greater than or equal to twice the inner diameter of the annular elastic member 30.

[0127] Please refer to Figure 16 for another embodiment of the electric drive assembly provided by the present application.

[0128] As Figure 16 shown, the protective sleeve 100 provided by the present application comprises an annular end cover 70. The annular end cover 70 is arranged at the sleeve mouth 20. When the protective sleeve 100 provided by the present application is used to protect the first section of the transmission shaft 201 exposed outside the housing 301, the annular end cover 70 is used to fit the outer surface of the housing 301 of the electric drive assembly 300 to shield the bearing hole 304 on the housing 301 for the transmission shaft 200 to extend out.

[0129] The annular end cover 70 is arranged around the periphery of the annular elastic member 30 in the radial direction of the annular elastic member 30. The annular end cover 70 is used to at least partially shield the bearing hole 304 on the housing 301. This avoids foreign matter from entering between the inner and outer rings of the motor bearing of the electric drive assembly 300 through the bearing hole 304, thereby improving the protection effect of the protective sleeve 100 provided by the present application on the electric drive assembly 300.

[0130] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A protective sleeve, characterized in that, The protective sleeve is used for protecting a section of a transmission shaft exposed from a housing of an electric drive assembly, and comprises a receiving cavity and a sleeve opening, the receiving cavity is communicated with the outside through the sleeve opening, wherein: The receiving cavity is used for accommodating the section of the transmission shaft, and a cavity wall of the receiving cavity comprises a flexible material; The sleeve opening comprises an annular elastic member, and the annular elastic member is used for sleeving the section of the transmission shaft.

2. The sheath of claim 1, wherein, An inner diameter of the annular elastic member in a natural state is smaller than an outer diameter of the section of the transmission shaft, wherein: Along a circumferential direction of the annular elastic member, a circumference of the annular elastic member is greater than or equal to half of a length of the protective sleeve in an axial direction of the annular elastic member, and smaller than or equal to twice the length of the protective sleeve in the axial direction of the annular elastic member; Along the axial direction of the annular elastic member, a length of the annular elastic member is smaller than half of a length of the receiving cavity.

3. The protective sleeve of claim 1, wherein, The cavity wall of the receiving cavity comprises a rustproof layer and a buffer layer which are stacked, the rustproof layer is used for forming an inner cavity wall of the receiving cavity, and the buffer layer is used for forming an outer cavity wall of the receiving cavity.

4. The sheath of claim 3, wherein, The buffer layer comprises a plurality of bubbles which are arranged along a planar direction of the buffer layer, wherein: A spacing between any two adjacent bubbles is smaller than a radius of the bubble.

5. The sheath of claim 4, wherein, The rustproof layer is attached to the buffer layer, and the plurality of bubbles of the buffer layer are located on a surface of the buffer layer which faces the rustproof layer.

6. A shield as claimed in any one of claims 1 to 5, wherein, The protective sleeve comprises an annular flexible member which is used for being fixed to the inner cavity wall of the receiving cavity, an axis of the annular flexible member coincides with an axis of the annular elastic member, an inner diameter of the annular flexible member is greater than an inner diameter of the annular elastic member, and smaller than twice the inner diameter of the annular elastic member.

7. The sheath of claim 6, wherein, Along the axial direction of the annular elastic member, a spacing distance between the annular flexible member and the annular elastic member is smaller than or equal to half of a length of the protective sleeve.

8. The sheath of claim 6, wherein, The protective sleeve comprises another annular flexible member which is used for being fixed to the inner cavity wall of the receiving cavity and is arranged at a side away from the annular elastic member along the axial direction of the annular elastic member, an axis of the another annular flexible member coincides with the axis of the annular flexible member.

9. The sheath of claim 8, wherein, Along the axial direction of the annular elastic member, a spacing distance between the another annular flexible member and the annular flexible member is greater than the spacing distance between the annular flexible member and the annular elastic member.

10. The sheath of claim 8, wherein, The protective sleeve comprises a plurality of connecting members, each of the connecting members is used for fixedly connecting the annular flexible member and the another annular flexible member along the axial direction of the annular elastic member, and the plurality of connecting members are arranged at intervals along a circumferential direction of the annular elastic member.

11. The sheath of any of claims 1-5, wherein, The protective sleeve comprises a positioning protrusion, the positioning protrusion comprises two opposite ends along the axial direction of the annular elastic member, one end of the positioning protrusion is used for being fixed to the inner cavity wall of the accommodating cavity, and the other end of the positioning protrusion is used for extending towards the sleeve opening.

12. The sheath of claim 11, wherein, The outer diameter of the one end of the positioning protrusion is greater than the outer diameter of the other end of the positioning protrusion and less than half of the inner diameter of the annular elastic member along the radial direction of the annular elastic member.

13. The sheath of any of claims 1-5, wherein, The sleeve opening comprises an annular end cover, the annular end cover is used for being annularly arranged on the outer periphery of the annular elastic member along the radial direction of the annular elastic member, and the outer diameter of the annular end cover is greater than or equal to twice the inner diameter of the annular elastic member.

14. An electric drive assembly, comprising: The electric drive assembly comprises a transmission shaft and the protective sleeve according to any one of claims 1-13, a part of the transmission shaft is exposed from the shell of the electric drive assembly and is used for being drivingly connected to the wheel, and the sleeve opening of the protective sleeve is fitted and fixed to the outer peripheral surface of the part of the transmission shaft.

15. The electric drive assembly of claim 14, wherein, The part of the transmission shaft comprises a spline section and a cylindrical section along the axial direction of the transmission shaft, the outer diameter of the spline section is greater than the outer diameter of the cylindrical section, the spline section is used for connecting the part of the transmission shaft located in the shell through the cylindrical section, and the annular elastic member in the sleeve opening is used for being sleeved and fitted to the outer peripheral surface of the cylindrical section.

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