Dustproof cover, electric driving assembly, electric driving system and vehicle

Abstract

The utility model relates to the field of vehicles, and provides a dustproof cover, an electric driving assembly, an electric driving system and a vehicle. The dustproof cover comprises a cover body, a first face and a second face are arranged on the two opposite sides of the cover body in the thickness direction of the cover body respectively, a first annular groove and a second annular groove which are sunken towards the second face in the thickness direction of the cover body are formed in the first face, and the second annular groove is formed around the first annular groove. And the second annular groove is positioned on the periphery of the first annular groove. The first annular groove is used for covering the dustproof lip of the oil seal ring so as to be in sealing fit with the dustproof lip. The second annular groove is used for being in sealing fit with the transmission shell. When the dustproof cover with the multiple sealing matching structures is used, sundries are not prone to falling into the dustproof lip and not prone to entering the space between the driving shaft shell and the oil seal lip of the oil seal piece, and the oil seal piece is prevented from being abraded easily.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more particularly to a dust cover, an electric drive assembly, an electric drive system, and a vehicle. Background Technology

[0002] Dust covers need to be installed on the oil seal between the reducer housing and the drive shaft to prevent debris from falling into the oil seal and causing wear.

[0003] In related technologies, such as Figure 1 As shown, a C-shaped dust cover 10 is press-fitted onto the drive shaft. The C-shaped dust cover covers the dust lip 410 of the oil seal for dust prevention. Debris often falls into the dust lip 410 through the gap between the C-shaped dust cover 10 and the dust lip 410 of the oil seal, and then enters the space between the oil seal lip and the drive shaft, which can easily cause wear on the oil seal. Utility Model Content

[0004] This application provides a dust cover, an electric drive assembly, an electric drive system, and a vehicle, wherein the dust cover has a better dust protection effect.

[0005] In a first aspect, this application provides a dust cover, the dust cover including a cover body, the cover body having a first surface and a second surface on opposite sides along its thickness direction, a first annular groove and a second annular groove being formed on the first surface and recessed toward the second surface along the thickness direction of the cover body, the second annular groove being disposed around the first annular groove and located at the periphery of the first annular groove.

[0006] In some embodiments, at least two second annular grooves are provided, with one of two adjacent second annular grooves surrounding the other, and one of two adjacent second annular grooves located on the periphery of the other along the radial direction of the second annular groove.

[0007] In some embodiments, a third annular groove is formed on the second surface, recessed toward the first surface along the thickness direction of the cover, and the third annular groove is located between the first annular groove and the second annular groove adjacent to the first annular groove along the radial direction of the second annular groove.

[0008] In some embodiments, the second annular groove has an outer sidewall and an inner sidewall along its radial direction, the length of the outer sidewall in the thickness direction of the cover being greater than the length of the inner sidewall in the thickness direction of the cover.

[0009] Secondly, this application provides an electric drive assembly, the electric drive assembly comprising:

[0010] Transmission housing;

[0011] a drive shaft housing connected with the drive shaft, one end of the drive shaft housing extending into the transmission housing;

[0012] In the dust cover of the first aspect, the periphery of the part of the drive shaft housing outside the transmission housing is sleeved with the dust cover, and the first surface of the dust cover faces the transmission housing;

[0013] The end of the transmission housing facing the first surface is formed with an annular boss, and the annular boss extends into the second annular groove and sealingly cooperates with the second annular groove.

[0014] In some embodiments, an oil seal is arranged between the drive shaft housing and the transmission housing, the side wall of the first annular groove sealingly cooperates with a dust lip of the oil seal, and the part of the first surface between the first annular groove and the second annular groove sealingly cooperates with an end surface of the transmission housing;

[0015] The annular boss, the second annular groove, the part of the first surface between the first annular groove and the second annular groove, the transmission housing, and the dust lip and the first annular groove form a dustproof labyrinth structure.

[0016] In some embodiments, the two side walls of the annular boss and the two side walls of the second annular groove are gap-fitted, and the end surface of the annular boss and the bottom surface of the second annular groove are gap-fitted.

[0017] In some embodiments, the part of the drive shaft housing outside the transmission housing is radially protruded to form a limiting boss, the dust cover is located between the transmission housing and the limiting boss in the axial direction of the drive shaft, and the bottom end of the first annular groove abuts against the limiting boss.

[0018] In some embodiments, the center of the dust cover is provided with a through hole, the edge of the through hole extends to form a sleeve in the axial direction of the drive shaft, and the sleeve is sleeved on the periphery of the drive shaft housing.

[0019] In a third aspect, the application provides an electric drive system, which comprises the electric drive assembly.

[0020] In a fourth aspect, the application provides a vehicle, which comprises the electric drive system.

[0021] The dust cover, the electric drive assembly, the electric drive system and the vehicle provided by the embodiments of the present application, the dust cover is formed with a first annular groove recessed towards a second face along the thickness direction of the cover body on the first face of the cover body, the first annular groove is used for sealingly fitting with the dust lip of the oil seal ring. The second annular groove is recessed towards the second face along the thickness direction of the cover body on the first face of the cover body, and the second annular groove is arranged around the first annular groove and located at the periphery of the first annular groove, so that the second annular groove is used for sealingly fitting with the transmission housing. The dust cover with multiple sealing fitting structures is not easy to fall into the dust lip when in use, and is not easy to enter between the driving shaft housing and the oil seal lip of the oil seal, thereby avoiding easy wear of the oil seal. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is a structural schematic diagram of the electric drive assembly in the related art;

[0024] Figure 2 It is a structural schematic diagram of the electric drive assembly provided by the embodiments of the present application;

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the dust cover provided by the embodiments of the present application;

[0026] Figure 4 It is a structural schematic diagram of the dust cover provided by the embodiments of the present application;

[0027] Figure 5 It is a sectional view of the dust cover provided by the embodiments of the present application.

[0028] Explanation of reference numerals:

[0029] 1, dust cover; 11, first face; 12, second face; 13, first annular groove; 131, bottom end;

[0030] 14, second annular groove; 141, outer side wall; 142, inner side wall; 15, third annular groove;

[0031] 16, through hole; 17, sleeve;

[0032] 2, transmission housing; 21, annular boss; 3, driving shaft housing; 331, limiting boss;

[0033] 4, oil seal; 41, dust lip; 42, main oil seal lip; 43, auxiliary oil seal lip. DETAILED DESCRIPTION

[0034] In order to enable a more clear understanding of the above-mentioned objects, features and advantages of the present disclosure, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other different manners from those described herein; obviously, the embodiments in the description are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0036] As shown in Figures 2 to 5 The present embodiment provides a dust cover 1, which comprises a cover body, the cover body has a first surface 11 and a second surface 12 on opposite sides along the thickness direction of the cover body, a first annular groove 13 and a second annular groove 14 are formed on the first surface 11 and recessed toward the second surface 12 along the thickness direction of the cover body, the second annular groove 14 is arranged around the first annular groove 13, and the second annular groove 14 is located at the periphery of the first annular groove 13. The dust cover 1 is usually a circular cover, of course, the dust cover 1 can also be a polygonal or elliptical cover body or other types of cover body.

[0037] The first annular groove 13 is used to cover the dust lip 41 of the oil seal ring to form a sealing fit with the dust lip 41. The second annular groove 14 is used to form a sealing fit with the transmission housing 2. When the dust cover 1 with multiple sealing fit structures is used, foreign matter is not easy to fall into the dust lip 41, and it is also not easy to enter between the drive shaft housing 3 and the oil seal lip of the oil seal 4, thereby avoiding easy wear of the oil seal 4.

[0038] As shown in Figure 2 The oil seal 4 is provided with a main oil seal lip 42, an auxiliary oil seal lip 43 and a dust lip 41, the main oil seal lip 42, the auxiliary oil seal lip 43 and the dust lip 41 are distributed along the axial direction of the oil seal 4, and the dust lip 41 is located at one end of the oil seal 4 close to the opening of the transmission housing 2. If foreign matter falls into the dust lip 41, the foreign matter is easy to enter between the drive shaft housing 3 and the oil seal lip (the main oil seal lip 42 and the auxiliary oil seal lip 43) of the oil seal 4, causing wear of the oil seal 4 and resulting in oil leakage.

[0039] In some embodiments, in order to facilitate the processing and production of the dust cover 1, the first annular groove 13 and the second annular groove 14 are concentrically arranged.

[0040] As shown in Figure 2 and Figure 5As shown, in some embodiments, the second surface 12 is formed with a third annular groove 15 recessed towards the first surface 11 along the thickness direction of the cover, and the third annular groove 15 is located between the first annular groove 13 and the second annular groove 14 adjacent to the first annular groove 13 along the radial direction of the second annular groove 14. That is, the thickness of the portion of the cover between the first annular groove 13 and the second annular groove 14 can be thinned, so that the weight of the entire dust cover 1 is reduced.

[0041] As shown, Figures 2 to 5 Another embodiment of the present application provides an electric drive assembly, which includes a transmission housing 2, a drive shaft housing 3 connected with a drive shaft, the drive shaft housing 3 can be bell-shaped, one end of the drive shaft housing 3 extends into the transmission housing 2, the outer periphery of the portion of the drive shaft housing 3 located outside the transmission housing 2 is sleeved with a dust cover 1, and the first surface 11 of the dust cover 1 faces the transmission housing 2, wherein the end of the transmission housing 2 facing the first surface 11 is formed with an annular boss 21, and the annular boss 21 extends into the second annular groove 14 and sealingly cooperates with the second annular groove 14.

[0042] The first annular groove 13 of the dust cover 1 covers the dust lip 41 of the oil seal ring to form a first layer of sealing structure, and the second annular groove 14 forms a second layer of sealing structure with the annular boss 21 on the transmission housing 2. The electric drive assembly with two layers of sealing structure is not easy for dirt to fall into the dust lip 41 of the oil seal 4 through the two layers of sealing structure, and is not easy to enter between the drive shaft housing 3 and the oil seal lip of the oil seal 4, thereby avoiding easy wear of the oil seal 4.

[0043] As shown, Figure 2 As shown, the dirt first falls into the outer side wall 141 of the second annular groove 14 and is easy to enter between the outer side wall 141 and the annular boss 21. In some embodiments, the length of the outer side wall 141 of the second annular groove 14 in the thickness direction of the dust cover 1 is greater than the length of the inner side wall 142 of the second annular groove 14 in the thickness direction of the dust cover 1 (not shown in the figure), thereby improving the dustproof effect of the outer side wall 141.

[0044] In some embodiments, the second annular groove 14 is provided with at least two (not shown in the figure), one of the two second annular grooves 14 is arranged around the other, and one of the two second annular grooves 14 is located at the periphery of the other along the radial direction of the second annular groove 14. Correspondingly, the end of the transmission housing 2 facing the first surface 11 is formed with at least two annular bosses 21, the annular bosses 21 sealingly cooperate with the second annular grooves 14 one by one, and the multiple annular bosses 21 and the multiple annular grooves form multiple second layers of sealing structure, thereby further improving the dustproof effect of the dust cover 1.

[0045] In some embodiments, the oil seal 4 is arranged between the drive shaft housing 3 and the transmission housing 2, and the side wall of the first annular groove 13 is in sealing cooperation with a dust lip 41 of the oil seal 4. In a specific implementation, the dust lip 41 of the oil seal 4 is in slight contact with the side wall of the first annular groove 13, and when the dust cover 1 rotates with the drive shaft housing 3, the dust lip 41 slightly rubs against the side wall of the first annular groove 13, without affecting the normal rotation of the drive shaft housing 3 relative to the transmission housing 2. As shown in Figure 2 the second face 12 between the first annular groove 13 and the second annular groove 14 is in sealing cooperation with the end face of the transmission housing 2, and in a specific implementation, there is a small gap between the second face 12 between the first annular groove 13 and the second annular groove 14 and the end face of the transmission housing 2, and the smaller the gap, the better the dustproof effect.

[0046] As shown in Figure 2 the annular boss 21, the second face 12 between the first annular groove 13 and the second annular groove 14, the transmission housing 2, and the dust lip 41 and the first annular groove 13 form a dustproof labyrinth structure. The dustproof labyrinth structure is in a coiled type and has a plurality of curved sections, so that foreign matters are not easy to fall into the dust lip 41 through the dustproof labyrinth structure, and thus are not easy to enter between the drive shaft housing 3 and the oil seal 4, thereby avoiding easy wear of the oil seal 4.

[0047] In some embodiments, the two side walls of the annular boss 21 and the two side walls of the second annular groove 14 are in gap cooperation, and the end face of the annular boss 21 and the bottom face of the second annular groove 14 are in gap cooperation, so as to avoid friction between the second annular groove 14 and the annular boss 21 when the dust cover 1 rotates, when the annular boss 21 contacts the second annular groove 14. Of course, the gap between the annular boss 21 and the second annular groove 14 is very small, and the smaller the gap between the annular boss 21 and the second annular groove 14, the better the dustproof effect.

[0048] As shown in Figure 2 In some embodiments, the part of the drive shaft housing 3 outside the transmission housing 2 is raised along the radial direction to form a limiting boss 331, and along the axial direction of the drive shaft, the dust cover 1 is located between the transmission housing 2 and the limiting boss 331, the bottom end 131 of the first annular groove 13 abuts against the limiting boss 331, and the abutting face of the bottom end 131 of the first annular groove 13 abutting against the limiting boss 331 is a partial surface of the second face 12. The limiting boss 331 limits the dust cover 1, so that the dust cover 1 is not easy to deviate in the axial direction of the drive shaft housing 3.

[0049] Further, the limiting boss 331 can be connected with the dust cover 1 by welding or bonding, so that the dust cover 1 is not easy to move towards the transmission housing 2, avoiding the first annular groove 13 and the dust lip 41 being extruded, and avoiding the excessive friction force when the dust cover 1 rotates relative to the dust lip 41 causing the dust lip 41 and the dust cover 1 to wear and energy loss.

[0050] In some embodiments, the center of the dust cover 1 is provided with a through hole 16, the edge of the through hole 16 extends along the axial direction of the drive shaft to form a sleeve 17, the sleeve 17 is sleeved on the periphery of the drive shaft housing 3, thereby increasing the connection area of the dust cover 1 and the drive shaft housing 3, and improving the connection strength of the dust cover 1 and the drive shaft housing 3.

[0051] Another embodiment of the present application provides a vehicle comprising the above-mentioned electric drive assembly.

[0052] It should be noted that, in this document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", "includes", "including", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a", "comprising... a", "includes... a", "including... a", or the like, does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the listed element.

[0053] It should also be noted that, although the present application has been described with reference to the preferred embodiments, various modifications can be made to the application without departing from the scope of the application, and equivalent components can be substituted for the components thereof, especially, the technical features mentioned in each embodiment can be combined in any way, as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0054] The above describes only the specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, module and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here. It should be understood that the protection scope of the present application is not limited to this, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A dust cover, characterized in that, The dust cover comprises a cover body having a first surface and a second surface on opposite sides thereof along a thickness direction of the cover body, the first surface is provided with a first annular groove and a second annular groove recessed towards the second surface along the thickness direction of the cover body, the first annular groove is used for covering a dust lip, the second annular groove is used for forming a sealing fit with an annular boss, the second annular groove is arranged around the first annular groove, and the second annular groove is located at a periphery of the first annular groove.

2. The dust cap of claim 1, wherein The second surface is provided with a third annular groove recessed towards the first surface along the thickness direction of the cover body, and the third annular groove is located between the first annular groove and the second annular groove adjacent to the first annular groove along a radial direction of the second annular groove.

3. The dust cap of claim 1, wherein The second annular groove has an outer side wall and an inner side wall along a radial direction thereof, and a length of the outer side wall in the thickness direction of the cover body is greater than a length of the inner side wall in the thickness direction of the cover body.

4. An electric drive assembly, characterized by The dust cover comprises: The dust cover according to any one of claims 1 to 3, a portion of the drive shaft housing located outside the transmission housing is peripherally sleeved with the dust cover, and the first surface of the dust cover faces the transmission housing; The transmission housing; The drive shaft housing is connected with a drive shaft, and one end of the drive shaft housing extends into the transmission housing; The transmission housing is provided with an annular boss at an end thereof facing the first surface, and the annular boss extends into the second annular groove and forms a sealing fit with the second annular groove.

5. The electric drive assembly of claim 4, wherein, An oil seal is arranged between the drive shaft housing and the transmission housing, a side wall of the first annular groove forms a sealing fit with a dust lip of the oil seal, and a portion of the first surface located between the first annular groove and the second annular groove forms a sealing fit with an end surface of the transmission housing; The annular boss, the second annular groove, the portion of the first surface located between the first annular groove and the second annular groove, the transmission housing, and the dust lip form a dustproof labyrinth structure.

6. The electric drive assembly of claim 4, wherein, Two side walls of the annular boss and two side walls of the second annular groove are in clearance fit, and an end surface of the annular boss and a bottom surface of the second annular groove are in clearance fit.

7. The electric drive assembly of claim 5, wherein, A portion of the drive shaft housing located outside the transmission housing is radially protruding to form a limiting boss, the dust cover is located between the transmission housing and the limiting boss along an axial direction of the drive shaft, and a bottom end of the first annular groove abuts against the limiting boss.

8. The electric drive assembly of claim 7, wherein, A through hole is arranged at a center of the dust cover, an edge of the through hole extends along the axial direction of the drive shaft to form a sleeve, and the sleeve is sleeved on a periphery of the drive shaft housing.

9. An electric drive system, characterized by The electric drive assembly comprises the dust cover according to any one of claims 4 to 8.

10. A vehicle characterized by comprising: The electric drive system comprises the dust cover according to claim 9.

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