Shaft grounding element, shaft grounding structure and electric drive assembly
The implementation of oil guide channels and surface textures on shaft grounding elements addresses the issue of poor contact and oil film formation, ensuring reliable and corrosion-resistant contact in oil environments.
Patent Information
- Application Number
- CN202420957592.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-06
AI Technical Summary
The poor contact between shaft grounding elements and shafts in oil environments leads to electrical corrosion failures due to poor conductivity, which is exacerbated by the formation of an oil film.
The introduction of oil guide channels and surface textures on the contact surface of the shaft grounding element to manage and drain oil, ensuring stable and continuous contact by preventing the formation of an oil film.
Enhances the reliability and robustness of the contact between the shaft grounding element and shaft, effectively preventing electrical corrosion failures by maintaining conductivity and stability.
Smart Images
Figure CN222300875U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of conductive structures, in particular to a shaft grounding element, a shaft grounding structure and an electric drive assembly. Background Art
[0002] The shaft grounding structure (for example, conductive carbon brush) is often used as a "conducting" method to provide a way out for leakage current to solve the problem of bearing electrocorrosion. The shaft grounding structure is usually placed at the motor end or reducer end, and is axially or radially installed to protect the bearing, and has the characteristics of low cost.
[0003] In the related art, the shaft grounding structure contacts the shaft through a shaft grounding element. The surface where the shaft grounding element contacts the shaft is the contact surface. The contact surface of the shaft grounding element usually adopts a smoother surface. When used in an oil environment, it will be affected by the oil film, resulting in poor contact between the shaft grounding element and the shaft, causing electrical corrosion failure of the bearing due to poor conductivity between the shaft grounding element and the shaft. Utility Model Content
[0004] The main purpose of the utility model is to propose a shaft grounding element, a shaft grounding structure and an electric drive assembly, aiming to solve the problem of poor contact between the shaft grounding element and the shaft, so as to avoid bearing electrical corrosion failure caused by poor conductivity between the shaft grounding element and the shaft.
[0005] To achieve the above objectives, the utility model proposes a shaft grounding element, which is provided with a contact surface for contacting the shaft, and the contact surface is provided with at least one oil guide channel, and the oil guide channel is used to store and / or lead out the oil between the contact surface and the shaft.
[0006] In one embodiment, at least one of the oil guide channels has an end away from the contact surface that penetrates to a side surface opposite to the contact surface.
[0007] In one embodiment, an extending direction of the oil guiding channel is consistent with a length direction of the shaft grounding element.
[0008] In one embodiment, at least one of the oil guide channels has an end away from the contact surface that passes through to a side surface that is perpendicular to or intersects the contact surface.
[0009] In one embodiment, the oil guide channel includes:
[0010] An oil inlet section, wherein the oil inlet of the oil inlet section is arranged on the contact surface;
[0011] An oil outlet section, the oil inlet of the oil outlet section is connected to the oil outlet of the oil inlet section, the oil outlet of the oil outlet section penetrates to a side surface that is perpendicular to or intersects the contact surface, the extension direction of the oil inlet section is consistent with the length direction of the shaft grounding element, and is set at an angle to the extension direction of the oil outlet section.
[0012] In one embodiment, the oil outlet section is provided with at least two oil outlets, and the at least two oil outlets of the oil outlet section are respectively arranged on the same side surface or different side surfaces of the shaft grounding element.
[0013] In one embodiment, at least one of the oil guiding channels is a blind hole channel.
[0014] In one embodiment, the contact surface is further provided with a surface texture, and the surface texture forms at least one oil guide path, and the oil guide path is used to guide the oil between the contact surface and the shaft.
[0015] In one embodiment, the surface texture is a surface grain.
[0016] In one embodiment, the contact surface is provided with a first side and a second side opposite to each other, and the surface texture runs from the first side to the second side, so that the oil guide path runs from the first side to the second side;
[0017] And / or, the surface texture includes at least one of stripes, corrugations, teeth, and grids.
[0018] The utility model also provides a shaft grounding structure, comprising:
[0019] Bracket;
[0020] The shaft grounding element as described above, the shaft grounding element is movably arranged on the bracket, and the contact surface of the shaft grounding element is used to contact the end surface and / or the peripheral surface of the shaft;
[0021] An elastic member is arranged on a side of the shaft grounding element away from the contact surface, and is used for providing an elastic force toward the shaft to the shaft grounding element.
[0022] The utility model also provides an electric drive assembly, comprising a shaft and the shaft grounding structure as described above, wherein the contact surface of the shaft grounding element contacts the end surface and / or the peripheral surface of the shaft.
[0023] The technical solution of the utility model is to provide at least one oil guide channel on the contact surface of the shaft grounding element. When used in an oil environment, the oil guide channel can be used to store and / or lead out the oil between the contact surface of the shaft grounding element and the shaft, so that the oil between the contact surface and the shaft can be timely drained without forming an oil film between the contact surface and the shaft, thereby ensuring the stability and continuity of the contact between the shaft grounding element and the shaft, and improving the contact reliability and robustness of the shaft grounding element, thereby effectively solving the problem of poor contact between the shaft grounding element and the shaft, and avoiding bearing electrical corrosion failure caused by poor conductivity between the shaft grounding element and the shaft. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0025] Figure 1 A schematic structural diagram of a first embodiment of a shaft grounding element provided by the utility model;
[0026] Figure 2 A schematic diagram of the structure of the first embodiment of the shaft grounding element provided by the utility model when it cooperates with the shaft;
[0027] Figure 3 A schematic structural diagram of a first embodiment of a shaft grounding element provided by the utility model;
[0028] Figure 4 A schematic structural diagram of a second embodiment of a shaft grounding element provided by the utility model;
[0029] Figure 5 A schematic structural diagram of a third embodiment of a shaft grounding element provided by the utility model;
[0030] Figure 6 Bottom views of the first, second and third embodiments of the shaft grounding element provided by the utility model;
[0031] Figure 7 A bottom view of a fourth embodiment of a shaft grounding element provided by the utility model;
[0032] Figure 8 A bottom view of a fifth embodiment of the shaft grounding element provided by the utility model;
[0033] Fig. 9 A bottom view of a sixth embodiment of a shaft grounding element provided by the utility model;
[0034] Fig.10 A bottom view of a seventh embodiment of the shaft grounding element provided by the utility model;
[0035] Fig.11 A bottom view of an eighth embodiment of a shaft grounding element provided by the utility model;
[0036] Fig.12 This is a structural schematic diagram of an embodiment of an electric drive assembly provided by the utility model.
[0037] Description of Figure Numbers:
[0038] 1000, electric drive assembly; 100, shaft grounding structure; 10, shaft grounding element; 11, contact surface; 111, oil guide channel; 1111, oil inlet section; 1112, oil outlet section; 112, surface texture; 1121, oil guide path; 20, bracket; 30, elastic member; 200, shaft.
[0039] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0043] Shaft grounding elements (e.g., conductive carbon brushes) are often used as a "conductor" method to provide a way out for leakage current to solve the problem of bearing electrocorrosion. Shaft grounding elements are usually placed at the motor end or reducer end, and are axially or radially installed to protect bearings, and are low-cost.
[0044] In the related art, the surface where the shaft grounding element contacts the shaft is the contact surface, and the contact surface of the shaft grounding element usually adopts a relatively smooth surface. When used in an oil environment, it will be affected by the oil film, resulting in poor contact between the shaft grounding element and the shaft, causing electrical corrosion failure of the bearing due to poor conductivity between the shaft grounding element and the shaft.
[0045] Based on the above problems, the utility model proposes a shaft grounding element 10, aiming to solve the problem of poor contact between the shaft grounding element 10 and the shaft 200, so as to avoid bearing electrical corrosion failure caused by poor conductivity between the shaft grounding element 10 and the shaft 200.
[0046] See also Figures 1 to 5 In one embodiment of the utility model, the shaft grounding element 10 is provided with a contact surface 11 for contacting the shaft 200, and the contact surface 11 is provided with at least one oil guide channel 111, and the oil guide channel 111 is used to store and / or lead out the oil between the contact surface 11 and the shaft 200.
[0047] The technical solution of the utility model is to provide at least one oil guide channel 111 on the contact surface 11 of the shaft grounding element 10. When used in an oil environment, the oil guide channel 111 can be used to store and / or lead out the oil between the contact surface 11 of the shaft grounding element 10 and the shaft 200, so that the oil between the contact surface 11 and the shaft 200 can be timely drained without forming an oil film between the contact surface 11 and the shaft 200, thereby ensuring the stability and continuity of the contact between the shaft grounding element 10 and the shaft 200, and improving the contact reliability and robustness of the shaft grounding element 10, thereby effectively solving the problem of poor contact between the shaft grounding element 10 and the shaft 200, and avoiding bearing electrical corrosion failure caused by poor conductivity between the shaft grounding element 10 and the shaft 200.
[0048] In some embodiments, the shaft grounding element 10 may be a carbon rod, which has good conductivity, less wear on the shaft 200, and low material cost. Of course, in other embodiments, the shaft grounding element 10 may also be other conductive structural parts.
[0049] In actual application, the contact surface 11 of the shaft grounding element 10 may be a plane, a curved surface, or the like, as long as it can contact the shaft 200 .
[0050] In actual application, the shape of the oil guide channel 111 is not limited to a cylindrical hole, a rectangular slot, a T-slot, etc. Moreover, the oil guide form of the oil guide channel 111 can be "one in and one out", "one in and multiple out", "only in and no out", "multiple in and one out", "multiple in and multiple out".
[0051] In actual application, the contact surface 11 of the shaft grounding element 10 may contact the circumferential surface of the shaft 200 or the end surface of the shaft 200 .
[0052] See also Figure 3 In the first embodiment of the present utility model, at least one oil guide channel 111 has one end away from the contact surface 11 extending through a side surface opposite to the contact surface 11 .
[0053] With such an arrangement, the oil guide channel 111 can be a channel that passes through both ends. The oil between the contact surface 11 and the shaft 200 can pass through the oil guide channel 111 to one end of the contact surface 11 and enter the oil guide channel 111, and be drawn out from the other end of the oil guide channel 111, thereby avoiding the backflow of oil entering the oil guide channel 111.
[0054] In actual application, the oil guiding channel 111 may be a straight channel, a curved channel, or a bent channel.
[0055] See also Figure 3In the first embodiment of the present utility model, the extension direction of the oil guide channel 111 is consistent with the length direction of the shaft grounding element 10 .
[0056] With such arrangement, when the shaft 200 rotates, the oil between the contact surface 11 and the shaft 200 can be thrown into the oil guide channel 111 , so that the oil between the contact surface 11 and the shaft 200 can be more smoothly led out from the oil guide channel 111 .
[0057] See also Figure 4 In the second embodiment of the present invention, at least one oil guide channel 111 has one end away from the contact surface 11 extending through a side surface that is perpendicular to or intersecting the contact surface 11 .
[0058] With such an arrangement, the oil guide channel 111 can also be a channel with two through ends. The oil between the contact surface 11 and the shaft 200 can pass through the oil guide channel 111 to one end of the contact surface 11 and enter the oil guide channel 111, and be drawn out from the other end of the oil guide channel 111. This can also avoid the backflow of oil entering the oil guide channel 111.
[0059] In actual application, the oil guiding channel 111 may be a curved channel or a bent channel.
[0060] See also Figure 4 In the second embodiment of the utility model, the oil guide channel 111 includes an oil inlet section 1111 and an oil outlet section 1112; the oil inlet of the oil inlet section 1111 is arranged on the contact surface 11; the oil inlet of the oil outlet section 1112 is connected to the oil outlet of the oil inlet section 1111, and the oil outlet of the oil outlet section 1112 penetrates to a side surface which is perpendicular to or intersecting with the contact surface 11, and the extension direction of the oil inlet section 1111 is consistent with the length direction of the axial grounding element 10, and is arranged at an angle to the extension direction of the oil outlet section 1112.
[0061] With such arrangement, when the shaft 200 rotates, the oil between the contact surface 11 and the shaft 200 can first be thrown into the oil inlet section 1111, then enter the oil outlet section 1112 which is arranged at an angle to the oil inlet section 1111, and finally be led out from the oil outlet section 1112, thereby better avoiding the backflow of oil entering the oil guide channel 111.
[0062] In actual application, the oil inlet section 1111 may specifically have one or at least two oil inlets, and the oil outlet section 1112 may specifically have one or at least two oil outlets.
[0063] See also Figure 5 In the third embodiment of the utility model, the oil outlet section 1112 is provided with at least two oil outlets, and the at least two oil outlets of the oil outlet section 1112 are respectively arranged on the same side or different sides of the shaft grounding element 10.
[0064] With such an arrangement, the oil guiding form of the oil guiding channel 111 can be "one inlet and multiple outlets", so that the oil entering the oil guiding channel 111 can be quickly led out to the outside.
[0065] In some embodiments, at least two oil outlets of the oil outlet section 1112 may be disposed on the same side surface that is perpendicular to or intersects the contact surface 11 .
[0066] In other embodiments, at least two oil outlets of the oil outlet section 1112 may be disposed on two opposite side surfaces, or on two adjacent side surfaces.
[0067] In other embodiments of the present invention, at least one oil guiding channel 111 is a blind hole channel (not shown).
[0068] With such an arrangement, the oil guiding mode of the oil guiding channel 111 can be “in but not out”, so that the oil between the contact surface 11 and the shaft 200 can be stored in the oil guiding channel 111 .
[0069] See also Figure 6 In the first, second and third embodiments of the present utility model, the cross-sectional shape of the oil guide channel 111 can be circular.
[0070] See also Figure 7 In the fourth embodiment of the present utility model, the cross-sectional shape of the oil guide channel 111 can be at least one of an elliptical shape, a rectangular shape, and a special shape.
[0071] See also Figures 8 to 11 In the fifth to eighth embodiments of the present invention, the contact surface 11 is further provided with a surface texture 112 , and the surface texture 112 forms at least one oil guide path 1121 , and the oil guide path 1121 is used to lead out the oil between the contact surface 11 and the shaft 200 .
[0072] With such a configuration, when used in an oil environment, the oil between the contact surface 11 and the shaft 200 can be stored or drawn out through the channel, and the oil between the contact surface 11 and the shaft 200 can also be drawn out through the oil guide path 1121, so that the oil between the contact surface 11 and the shaft 200 can be timely guided without forming an oil film between the contact surface 11 and the shaft 200, thereby ensuring the stability and continuity between the shaft grounding element 10 and the shaft 200, and improving the contact reliability and robustness of the shaft grounding element 10, thereby effectively solving the problem of poor contact between the shaft grounding element 10 and the shaft 200, and avoiding electrical corrosion failure of the bearing caused by poor conductivity between the shaft grounding element 10 and the shaft 200. In addition, the configuration of the surface texture 112 can also increase the roughness of the contact surface 11, which can ensure good contact between the shaft grounding element 10 and the shaft 200 when there are errors in assembly or under loads such as vibration and impact.
[0073] In actual application, the surface texture 112 can be a surface texture, a surface protrusion, or at least one of the surface depressions, as long as at least one oil guide path 1121 can be formed to draw out the oil between the contact surface 11 and the shaft 200.
[0074] See also Figures 8 to 11 In the fifth to eighth embodiments of the present invention, the surface texture 112 is a surface texture.
[0075] In this way, by designing the surface texture 112 as a surface texture, a longer and more obvious oil guide path 1121 can be formed, which can better guide the oil between the contact surface 11 of the shaft grounding element 10 and the shaft 200.
[0076] See also Figures 8 to 11 In the fifth to eighth embodiments of the present invention, the contact surface 11 is provided with a first side and a second side opposite to each other, and the surface texture runs from the first side to the second side, so that the oil guide path 1121 runs from the first side to the second side.
[0077] With such a configuration, the oil guide path 1121 can guide the oil between the contact surface 11 and the shaft 200 to the first side and the second side, and can more quickly guide the oil between the contact surface 11 and the shaft 200, thereby achieving a better oil guiding effect.
[0078] See also Figures 8 to 11 In the fifth to eighth embodiments of the present invention, the surface texture includes at least one of stripes, ripples, tooth patterns, and grids. In this way, a straight or curved oil guide path 1121 can be formed to better guide the oil between the contact surface 11 and the shaft 200.
[0079] See also Figure 8 In the fifth embodiment of the present invention, the surface texture may be a plurality of stripes distributed at intervals to form a plurality of straight oil guide paths 1121 , and the stripes are arranged around the oil guide channel 111 .
[0080] See also Fig. 9 In the sixth embodiment of the present invention, the surface texture may be a plurality of corrugations distributed at intervals to form a plurality of curved oil guiding paths 1121 , and the corrugations are arranged around the oil guiding paths 1121 .
[0081] See also Fig.10 In the seventh embodiment of the present invention, the surface texture may be a plurality of teeth distributed at intervals to form a plurality of curved oil guide paths 1121 , and the teeth are arranged around the oil guide paths 1121 .
[0082] See also Fig.11In the eighth embodiment of the utility model, the surface texture can be a plurality of teeth distributed at intervals to form a plurality of curved oil guide paths 1121, and the teeth are arranged around the oil guide path 1121, wherein each tooth can include two staggered tooth units, so that a longer oil guide path 1121 can be formed.
[0083] See also Fig.12 The utility model also proposes a shaft grounding structure 100, which includes a bracket 20, an elastic member 30 and a shaft grounding element 10. The specific structure of the shaft grounding element 10 refers to the above embodiment. Since the shaft grounding structure 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.
[0084] In which, the axial grounding element 10 can be movably arranged on the bracket 20, and the contact surface 11 of the axial grounding element 10 is used to contact the end face and / or the peripheral surface of the shaft 200; the elastic member 30 is arranged on the side of the axial grounding element 10 away from the contact surface 11, and is used to provide an elastic force toward the shaft 200 to the axial grounding element 10.
[0085] It can be understood that the shaft grounding element 10 can be installed on the bracket 20 through the elastic member 30, and the elastic member 30 can provide the shaft grounding element 10 with an elastic force toward the shaft 200 to drive the shaft grounding element 10 to move toward the shaft 200, so that the contact surface 11 of the shaft grounding element 10 can contact the end face and / or the circumferential surface of the shaft 200. At this time, the leakage current of the shaft 200 can be transmitted to the shaft grounding element 10, and then transmitted to the grounded structure through the elastic member 30 and / or the wire structure to solve the problem of bearing electrical corrosion; in some embodiments, the shaft grounding structure 100 can also include a wire structure, which is electrically connected to the shaft grounding element 10; optionally, the wire structure can be replaced by other components, and a separate device is not required, for example, it can be replaced by an elastic member.
[0086] See also Fig.12 The utility model also proposes an electric drive assembly 1000, which includes a shaft 200 and a shaft grounding structure 100. The specific structure of the shaft grounding structure 100 refers to the above embodiment. Since the electric drive assembly 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0087] Specifically, the electric drive assembly 1000 may be a powertrain system or a motor system in the new energy vehicle industry, in particular an oil cooling system or a water-oil cooling hybrid system. The contact surface 11 of the shaft grounding element 10 contacts the end surface and / or the peripheral surface of the shaft 200 .
[0088] In some embodiments, the shaft 200 may be provided with a contact area for contacting the shaft grounding element 10, and the contact area may be provided with a shaft surface texture, and the shaft surface texture may form at least one shaft oil guide path, so that the oil between the contact surface 11 and the shaft 200 can be led out through the shaft oil guide path, so that the oil between the contact surface 11 and the shaft 200 can be timely drained without forming an oil film between the contact surface 11 and the shaft 200, thereby ensuring the stability and continuity between the shaft grounding element 10 and the shaft 200, and improving the contact reliability and robustness of the shaft grounding element 10, so as to effectively solve the problem of poor contact between the shaft grounding element 10 and the shaft 200, and avoid bearing electrical corrosion failure caused by poor conductivity between the shaft grounding element 10 and the shaft 200. In addition, the setting of the shaft surface texture can also increase the roughness of the contact area, which can ensure that the shaft grounding element 10 and the shaft 200 are in good contact under the action of errors in assembly or loads such as vibration and impact.
[0089] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A shaft grounding element, characterized in that: The shaft grounding element is provided with a contact surface for contacting the shaft, and the contact surface is provided with at least one oil guide channel, and the oil guide channel is used for storing and / or guiding oil between the contact surface and the shaft.
2. The shaft grounding element according to claim 1, characterized in that At least one of the oil guide channels has an end away from the contact surface that penetrates to a side surface opposite to the contact surface.
3. The shaft grounding element according to claim 2, characterized in that The extending direction of the oil guide channel is consistent with the length direction of the shaft grounding element.
4. The shaft grounding element according to claim 1, wherein: At least one of the oil guide channels has an end away from the contact surface that penetrates to a side surface that is perpendicular to or intersects the contact surface.
5. The shaft grounding element according to claim 4, characterized in that The oil guide channel comprises: An oil inlet section, wherein the oil inlet of the oil inlet section is arranged on the contact surface; An oil outlet section, the oil inlet of the oil outlet section is connected to the oil outlet of the oil inlet section, the oil outlet of the oil outlet section penetrates to a side surface that is perpendicular to or intersects the contact surface, the extension direction of the oil inlet section is consistent with the length direction of the shaft grounding element, and is set at an angle to the extension direction of the oil outlet section.
6. The shaft grounding element according to claim 5, characterized in that The oil outlet section is provided with at least two oil outlets, and the at least two oil outlets of the oil outlet section are respectively arranged on the same side or different sides of the shaft grounding element.
7. The shaft grounding element according to claim 1, wherein: At least one of the oil guide channels is a blind hole channel.
8. The shaft grounding element according to any one of claims 1 to 7, characterized in that: The contact surface is further provided with a surface texture, and the surface texture forms at least one oil guide path, and the oil guide path is used to guide the oil between the contact surface and the shaft.
9. The shaft grounding element according to claim 8, characterized in that The surface texture is a surface grain.
10. The shaft grounding element according to claim 9, wherein: The contact surface is provided with a first side edge and a second side edge opposite to each other, and the surface texture runs from the first side edge to the second side edge, so that the oil guide path runs from the first side edge to the second side edge; And / or, the surface texture includes at least one of stripes, corrugations, teeth, and grids.
11. A shaft grounding structure, characterized in that: include: Bracket; The shaft grounding element according to any one of claims 1 to 10, wherein the shaft grounding element is movably arranged on the bracket, and the contact surface of the shaft grounding element is used to contact the end surface and / or the peripheral surface of the shaft; An elastic member is arranged on a side of the shaft grounding element away from the contact surface, and is used for providing an elastic force toward the shaft to the shaft grounding element.
12. An electric drive assembly, characterized in that: The invention comprises a shaft and the shaft grounding structure according to claim 11, wherein the contact surface of the shaft grounding element contacts the end surface and / or the peripheral surface of the shaft.