Shaft grounding element, shaft grounding structure and electric drive assembly
By designing an oil conduction path on the contact surface of the shaft grounding element and the shaft, the problem of poor contact in the oil environment is solved, contact reliability and robustness are improved, and the bearing electrical corrosion failure is avoided.
Patent Information
- Application Number
- CN202420958281.0
- 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 contact between the shaft grounding element and the shaft in an oil environment leads to poor conductivity and leads to failure of the bearing electrical corrosion.
A surface texture is provided on the contact surface of the shaft grounding element and the shaft to form an oil conduction path to lead out the oil film, ensuring that the oil between the contact surface and the shaft is guided, and the contact stability and continuity are improved.
Through the design of the oil conduction path, the contact reliability and robustness of the shaft grounding element and the shaft are enhanced, and the electrical corrosion failure of bearings caused by poor conductivity is avoided, and good contact is maintained under assembly errors or vibration impacts.
Smart Images
Figure CN222300876U_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] 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.
[0003] 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. 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-mentioned purpose, 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 a surface texture, and the surface texture forms at least one oil guide path, and the oil guide path is used to lead out the oil between the contact surface and the shaft.
[0006] In one embodiment, the surface texture is a surface grain.
[0007] 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.
[0008] In one embodiment, the surface texture includes at least one of stripes, ripples, teeth, and grids.
[0009] The utility model also provides a shaft grounding structure, comprising:
[0010] Bracket;
[0011] 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;
[0012] An elastic member is arranged on a side of the shaft grounding member away from the contact surface, and is used for providing an elastic force toward the shaft to the shaft grounding member.
[0013] The utility model also provides an electric drive assembly, comprising a shaft and a shaft grounding structure, wherein a contact surface of the shaft grounding element contacts an end surface and / or a peripheral surface of the shaft;
[0014] The shaft is provided with a contact area for contacting the contact surface, the contact area is provided with a shaft surface texture, the shaft surface texture forms at least one shaft oil guide path, and the shaft oil guide path is used to lead out the oil between the contact surface and the shaft;
[0015] And / or, the shaft grounding structure is the shaft grounding structure as described above.
[0016] In one embodiment, when the contact area is provided with a shaft surface texture, the shaft surface texture is a shaft surface texture.
[0017] In one embodiment, the shaft surface texture includes at least one of stripes, ripples, teeth, grids, and triangular frames.
[0018] The technical solution of the utility model is to provide a surface texture on the contact surface of the shaft grounding element, and the surface texture forms at least one oil guide path. When used in an oil environment, the oil guide path can be used to 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 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.
[0019] In addition, the setting of the surface texture can also increase the roughness of the contact surface, which can ensure that the shaft grounding element and the shaft are in good contact under the action of errors in assembly or loads such as vibration and impact. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] 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.
[0021] Figure 1 A schematic structural diagram of a first embodiment of a shaft grounding element provided by the utility model;
[0022] 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;
[0023] Figure 3 A bottom view of a first embodiment of a shaft grounding element provided by the utility model;
[0024] Figure 4 A bottom view of a second embodiment of the shaft grounding element provided by the utility model;
[0025] Figure 5 A bottom view of a third embodiment of a shaft grounding element provided by the utility model;
[0026] Figure 6 A bottom view of a fourth embodiment of a shaft grounding element provided by the utility model;
[0027] Figure 7 A schematic structural diagram of the contact area in the first embodiment of the electric drive assembly provided by the utility model;
[0028] Figure 8 A schematic structural diagram of the contact area in the second embodiment of the electric drive assembly provided by the utility model;
[0029] Fig. 9 A schematic structural diagram of the contact area in the third embodiment of the electric drive assembly provided by the utility model;
[0030] Fig.10 This is a schematic structural diagram of the contact area and the shaft in the third embodiment of the electric drive assembly provided by the utility model;
[0031] Fig.11 This is a structural schematic diagram of an embodiment of an electric drive assembly provided by the utility model.
[0032] Description of Figure Numbers:
[0033] 1000, electric drive assembly; 100, shaft grounding structure; 10, shaft grounding element; 11, contact surface; 112, surface texture; 1121, oil guide path; 20, bracket; 30, elastic member; 200, shaft; 210, contact area; 211, shaft surface texture; 2111, shaft oil guide path.
[0034] 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
[0035] 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.
[0036] 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] See also Figures 1 to 6In 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 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.
[0042] The technical solution of the utility model is to provide a surface texture 112 on the contact surface 11 of the shaft grounding element 10, and the surface texture 112 forms at least one oil guide path 1121. When used in an oil environment, the oil guide path 1121 can be used to 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 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.
[0043] In addition, the surface texture 112 can also increase the roughness of the contact surface 11, which can ensure that the shaft grounding element 10 is in good contact with the shaft 200 when there are assembly errors or loads such as vibration and impact.
[0044] 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.
[0045] 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 .
[0046] 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.
[0047] 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 .
[0048] See also Figures 3 to 6 In the first to fourth embodiments of the present invention, the surface texture 112 is a surface texture.
[0049] 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.
[0050] See also Figures 3 to 6 In the first to fourth 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.
[0051] 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.
[0052] See also Figures 3 to 6 In the first to fourth 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.
[0053] See also Figure 3 In the first embodiment of the utility model, the surface texture can be a plurality of stripes distributed at intervals to form a plurality of linear oil guide paths 1121 .
[0054] See also Figure 4 In the second embodiment of the present invention, the surface texture may be a plurality of corrugations distributed at intervals to form a plurality of curved oil guide paths 1121 .
[0055] See also Figure 5 In the third embodiment of the present invention, the surface texture may be a plurality of tooth patterns distributed at intervals to form a plurality of curved oil guide paths 1121 .
[0056] See also Figure 6 In the fourth embodiment of the utility model, the surface texture can be a plurality of tooth patterns distributed at intervals to form a plurality of curved oil guide paths 1121, wherein each tooth pattern can include two staggered tooth pattern units, so that a longer oil guide path 1121 can be formed.
[0057] See also Fig.11The 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.
[0058] Among them, 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.
[0059] 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.
[0060] See also Figures 7 to 11 The utility model further provides an electric drive assembly 1000, which includes a shaft 200 and a shaft grounding structure 100, wherein a contact surface 11 of the shaft grounding element 10 contacts an end surface and / or a peripheral surface of the shaft 200;
[0061] The shaft 200 is provided with a contact area 210 for contacting the contact surface 11, the contact area 210 is provided with a shaft surface texture 211, the shaft surface texture 211 forms at least one shaft oil guide path 2111, and the shaft oil guide path 2111 is used to lead out the oil between the contact surface 11 and the shaft 200;
[0062] And / or, the shaft grounding structure is the shaft grounding structure 100 as described above, and the specific structure of the shaft grounding structure 100 refers to the above-mentioned embodiment. Since the electric drive assembly 1000 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.
[0063] 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.
[0064] It can be understood that by providing the shaft surface texture 211 on the contact surface 11 of the shaft 200, the shaft surface texture 211 forms at least one shaft oil guide path 2111, so that the oil between the contact surface 11 and the shaft 200 can be led out through the shaft oil guide path 2111, 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, ensuring the stability and continuity between the shaft grounding element 10 and the shaft 200, 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 the electrical corrosion failure of the bearing caused by the poor conductivity of the shaft grounding element 10 and the shaft 200. In addition, the provision of the shaft surface texture 211 can also increase the roughness of the contact area 210, 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.
[0065] In actual application, the shaft surface texture 211 can be a texture, a convex point, or at least one of the concave structures, as long as at least one shaft oil guide path 2111 can be formed to draw out the oil between the contact surface 11 and the shaft 200.
[0066] See also Figures 7 to 10 In the first to third embodiments of the present invention, when the contact area 210 is provided with the shaft surface texture 211, the shaft surface texture 211 is a shaft surface texture.
[0067] In this way, by designing the shaft surface texture 211 as a shaft surface texture, a longer and more obvious shaft oil guide path 2111 can be formed, which can better lead out the oil between the contact surface 11 of the shaft grounding element 10 and the shaft 200.
[0068] See also Figures 7 to 10 In the first to third embodiments of the present invention, the shaft surface texture includes at least one of stripes, ripples, tooth patterns, grids, and triangular frames. In this way, a straight or curved shaft oil guide path 2111 can be formed, which can better lead out the oil between the contact surface 11 and the shaft 200.
[0069] See also Figure 7 In the first embodiment of the utility model, the shaft surface texture can be a plurality of spaced-apart stripes, and the stripes are extended along the circumference of the shaft 200 to form a plurality of shaft oil guide paths 2111 extending along the shaft 200 .
[0070] See also Figure 8In the second embodiment of the present utility model, the shaft surface texture may be a grid formed by a plurality of oblique stripes to form a plurality of shaft oil guide paths 2111 .
[0071] See also Fig. 9 , Fig.10 In the third embodiment of the utility model, the shaft surface texture can be a plurality of triangular frames distributed at intervals to form a plurality of bent shaft oil guide paths 2111, so that a longer shaft oil guide path 2111 can be formed.
[0072] 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, the contact surface is provided with a surface texture, the surface texture forms at least one oil guide path, and the oil guide path is used to lead out the oil between the contact surface and the shaft.
2. The shaft grounding element according to claim 1, characterized in that The surface texture is a surface grain.
3. The shaft grounding element according to claim 2, characterized in that 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.
4. The shaft grounding element according to claim 2, wherein: The surface texture includes at least one of stripes, ripples, teeth and grids.
5. A shaft grounding structure, characterized in that: include: Bracket; The shaft grounding element according to any one of claims 1 to 4, 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 member away from the contact surface, and is used for providing an elastic force toward the shaft to the shaft grounding member.
6. An electric drive assembly, characterized in that: It comprises a shaft and a shaft grounding structure, wherein the contact surface of the shaft grounding element contacts the end surface and / or the peripheral surface of the shaft; The shaft is provided with a contact area for contacting the contact surface, the contact area is provided with a shaft surface texture, the shaft surface texture forms at least one shaft oil guide path, and the shaft oil guide path is used to lead out the oil between the contact surface and the shaft; And / or, the shaft grounding structure is the shaft grounding structure as claimed in claim 5.
7. The electric drive assembly according to claim 6, characterized in that: When the contact area is provided with a shaft surface texture, the shaft surface texture is a shaft surface texture.
8. The electric drive assembly according to claim 7, characterized in that: The shaft surface texture includes at least one of stripes, ripples, teeth, grids, and triangular frames.