Driving motor assembly and vehicle

Abstract

The utility model relates to a driving motor assembly and a vehicle. The driving motor assembly comprises a driving shaft, a flow guide part, a grounding part and a motor shell. The flow guide part is rotatably arranged on the driving shaft in a sleeving manner and is electrically connected with the driving shaft through the inner surface of the flow guide part; the grounding piece is fixed on the outer surface of the diversion piece, the inner surface of the grounding piece is electrically connected with the outer surface of the diversion piece, and the outer surface of the grounding piece is electrically connected with the motor shell. According to the driving motor assembly, the shaft current generated by the driving shaft is guided to the motor shell from the current guide part to the grounding part through the electric connection structure of the current guide part and the grounding part, so that the current is prevented from passing through the bearing to cause electrocorrosion, the service life of the bearing is effectively prolonged, and the reliability of the motor is improved. The fixing structure of the diversion member and the grounding member can stably and efficiently suppress the shaft current for a long time without frequent maintenance.

Description

Technical Field

[0001] This application relates to the field of motor structure technology, specifically to a drive motor assembly and a vehicle. Background Technology

[0002] In the field of drive motors, the problem of electro-corrosion caused by shaft voltage and shaft current has long plagued the industry. Shaft voltage originates from the imbalance of the stator magnetic field or the magnetization of the motor shaft during operation, resulting in an induced potential difference between the two ends of the shaft or between the shaft and the bearing. When the voltage exceeds the bearing oil film breakdown threshold, the shaft current flows through the loop of "shaft → bearing inner ring → oil film → bearing outer ring → motor housing", causing electro-spark corrosion, lubricating oil deterioration, and bearing mechanical wear, accompanied by NVH (noise, vibration, and harshness) problems.

[0003] In existing technologies, the main method for suppressing electro-corrosion is to use insulated bearings (such as ceramic ball bearings) or combined with conductive brushes to guide shaft current. Insulated bearings block current flow through the oil film, while conductive brushes guide the shaft current from the drive shaft to the housing. However, this approach has significant drawbacks. First, ceramic bearings are expensive and have a limited lifespan, and conductive brushes need to be replaced periodically to compensate for wear, increasing usage and maintenance costs. Second, when the conductive brushes have poor contact, shaft current may still flow through the bearing, accelerating electro-corrosion. Therefore, there is an urgent need for a drive motor assembly solution that can efficiently suppress electro-corrosion caused by shaft current and achieve long-term stability without frequent maintenance. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a drive motor assembly and vehicle that can guide the shaft current generated by the drive shaft to the motor housing via a current guide and a grounding component, thereby preventing current from passing through the bearing and causing electro-corrosion, effectively extending bearing life and improving motor reliability. The fixed structure of the current guide and grounding component can stably and efficiently suppress shaft current over a long period of time, eliminating the need for frequent maintenance.

[0005] To solve the above-mentioned technical problems, this application provides a drive motor assembly, including a drive shaft, a guide member, a grounding member, and a motor housing; the guide member is rotatably sleeved on the drive shaft and electrically connected to the drive shaft through the inner surface of the guide member; the grounding member is fixed to the outer surface of the guide member, the inner surface of the grounding member is electrically connected to the outer surface of the guide member, and the outer surface of the grounding member is electrically connected to the motor housing.

[0006] In one embodiment, the flow guide is an annular structure, and at least one elastic protrusion is provided along the circumferential direction of the inner surface of the flow guide. The flow guide is electrically connected to the drive shaft through the elastic protrusion.

[0007] In one embodiment, the grounding element is a ring structure or a fan-shaped structure.

[0008] In one embodiment, the inner surface of the flow guide is provided with an axial flow guide groove, which extends axially along the drive shaft and communicates with the elastic protrusion.

[0009] In one embodiment, an elastic conductive layer is provided on the outer surface of the grounding member away from the current conductor, and the elastic conductive layer is bonded to the inner wall of the motor housing by a pre-compression force.

[0010] In one embodiment, the end of the grounding component is provided with at least one conductive through hole, and the motor housing is provided with a grounding terminal. The conductive through hole is connected to the grounding terminal of the motor housing through a wire.

[0011] In one embodiment, the grounding element is fixedly connected to the current-conducting element by at least one of welding, bolting, or snap-fit ​​connection methods.

[0012] In one embodiment, the inner wall of the flow guide is provided with an elastic pressing structure to form an elastic pressure contact with the outer wall of the grounding member; and / or, the contact surface between the flow guide and the grounding member is provided with a conductive coating.

[0013] In one embodiment, the contact surfaces between the current guide and the grounding member are provided with microstructure textures.

[0014] This application also provides a vehicle that includes a drive motor assembly as described in any of the preceding claims.

[0015] The drive motor assembly and vehicle disclosed in this application include a drive shaft, a current guide, a grounding component, and a motor housing. The current guide is rotatably mounted on the drive shaft and electrically connected to the drive shaft via its inner surface. The grounding component is fixed to the outer surface of the current guide, with its inner surface electrically connected to the outer surface of the current guide and its outer surface electrically connected to the motor housing. This drive motor assembly, through the electrical connection structure between the current guide and the grounding component, directs the shaft current generated by the drive shaft to the motor housing via the current guide and grounding component, thereby preventing current from passing through the bearings and causing electro-corrosion, effectively extending bearing life and improving motor reliability. The fixed structure of the current guide and grounding component can stably and efficiently suppress shaft current over a long period, eliminating the need for frequent maintenance. Attached Figure Description

[0016] Figure 1 This is a side view of the drive motor assembly shown according to an embodiment of this application.

[0017] Figure 2 This is a cross-sectional view of the drive motor assembly shown according to an embodiment of this application.

[0018] Marking descriptions: 10, drive shaft; 11, grounding component; 111, elastic conductive layer; 12, current guide; 122, elastic protrusion. Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0020] In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the present application. It should be understood that other embodiments may also be used, and changes in mechanical composition, structure, electrical and operational aspects may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered limiting, and the terminology used herein is for describing particular embodiments only and is not intended to limit the present application.

[0021] Although the terms first, second, etc., are used in some instances to describe various elements herein, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0022] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, part, item, kind, and / or group, but do not preclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, parts, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition arise only when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some manner.

[0023] To address the technical problems described above, this application proposes a drive motor assembly. For example... Figure 1 and Figure 2 As shown, a drive motor assembly of this embodiment includes a drive shaft 10, a guide member 12, a grounding member 11, and a motor housing (not shown). The guide member 12 is rotatably sleeved on the drive shaft 10 and is electrically connected to the drive shaft 10 through the inner surface of the guide member 12. The grounding member 11 is fixed to the outer surface of the guide member 12, and the inner surface of the grounding member 11 is electrically connected to the outer surface of the guide member 12. The outer surface of the grounding member 11 is electrically connected to the motor housing.

[0024] In this embodiment, the current guide 12 directly contacts the drive shaft 10 through its inner surface to form an electrical connection, and the outer surface of the current guide 12 directly contacts the inner surface of the grounding component 11 to form an electrical connection. The grounding component 11 is connected to the motor housing through a fixed connection, thus forming a low-impedance conductive path of "drive shaft 10 - current guide 12 - grounding component 11 - motor housing". The shaft current is preferentially conducted to the housing through the current guide 12 and the grounding component 11, rather than through the path of "shaft → bearing inner ring → oil film → bearing outer ring → motor housing", avoiding the shaft current from passing through the bearing and thus eliminating the risk of electro-corrosion. In addition, this embodiment of the application utilizes the metal structure of the current guide 12 and the grounding component 11 to directly realize current conduction, which simplifies the structural design, eliminates the need for frequent maintenance, and significantly reduces long-term use costs.

[0025] In one embodiment, the flow guide 12 is an annular structure, and at least one elastic protrusion 122 is provided along the circumferential direction of the inner surface of the flow guide 12. The flow guide 12 is electrically connected to the drive shaft 10 through the elastic protrusion 122.

[0026] In this embodiment, the guide member 12 adopts a ring structure, which ensures uniform contact between the inner surface of the guide member 12 and the circumferential direction of the drive shaft 10. This increases the contact area between the guide member 12 and the drive shaft 10, while reducing the contact pressure per unit area on the drive shaft 10, avoiding local stress concentration, and reducing the risk of local wear on the drive shaft 10. The inner diameter of the guide member 12 is slightly larger than the diameter of the drive shaft 10 to ensure that the guide member 12 can rotate freely around the drive shaft 10.

[0027] The inner surface of the flow guide 12 is provided with one or more elastic protrusions 122, which are hemispherical, conical, or wavy. Preferably, the multiple elastic protrusions 122 are evenly distributed circumferentially along the inner surface of the flow guide 12 to ensure stable contact under dynamic operating conditions.

[0028] The elastic protrusion 122 is made of a conductive elastic material, such as conductive rubber or an elastic metal alloy, possessing both conductivity and elastic deformation capability. During motor operation, the elastic protrusion 122 undergoes elastic deformation due to centrifugal force or preload, tightly adhering to the surface of the drive shaft 10 to form a low-resistance conductive path. When the drive shaft 10 experiences slight displacement due to temperature changes or mechanical vibration, the elastic protrusion 122 automatically adjusts the contact pressure through its own elastic deformation, maintaining a stable electrical connection and preventing current interruption or arcing due to poor contact. Furthermore, the buffering properties of the elastic material in the elastic protrusion 122 reduce direct metal-to-metal friction between the drive shaft 10 and the guide member 12, extending service life and reducing the risk of failure. Compared to traditional conductive brushes that require periodic replacement, the drive motor assembly of this application reduces maintenance costs and downtime, making it particularly suitable for installation in new energy vehicles, electric-powered ships, electric-powered bicycles, and other transportation vehicles, thus improving reliability.

[0029] In one embodiment, the grounding element 11 is a ring structure or a fan-shaped structure.

[0030] like Figure 2 As shown, when the grounding component 11 has a fan-shaped structure, the inner arc surface of the grounding component 11 is in contact with the outer surface of the grounding ring 12. The fan-shaped structure supports split installation, which is convenient for flexible assembly in space-constrained scenarios.

[0031] When the grounding element 11 is a ring structure, the inner diameter of the grounding element 11 matches the outer diameter of the grounding ring 12, forming a continuous circumferential contact. The continuous contact surface of the ring structure ensures that the current is discharged uniformly along the circumferential direction, avoiding uneven current density caused by poor local contact and reducing contact resistance. The tight fit between the ring-shaped grounding element 11 and the current-conducting element 12 can resist centrifugal force and mechanical stress under high-speed rotation or vibration conditions, maintaining a long-term stable electrical connection.

[0032] In one embodiment, the inner surface of the guide member 12 is provided with an axial guide groove (not shown), which extends along the axial direction of the drive shaft 10 and communicates with the elastic protrusion 122.

[0033] The axial flow guide groove is a straight or spiral groove distributed along the axial direction of the drive shaft. One end of the axial flow guide groove is connected to the root of the elastic protrusion 122, and the other end extends to the end face of the flow guide 12. The axial extension direction of the axial flow guide groove is consistent with the flow trend of the shaft current, guiding the shaft current to be quickly transmitted from the drive shaft 10 through the elastic protrusion 122 to the flow guide 12 along a low-impedance path, avoiding disordered diffusion of current on the contact surface and improving the discharge efficiency.

[0034] In one embodiment, an elastic conductive layer 111 is provided on the outer surface of the grounding member 11 away from the current guide member 12, and the elastic conductive layer 111 is attached to the inner wall of the motor housing 30 by a pre-compression force.

[0035] The elastic conductive layer 111 is made of conductive rubber or elastic metal alloy, which can absorb the radial vibration transmitted by the drive shaft 10 and maintain a stable conductive connection between the grounding component 11 and the motor housing. The elastic conductive layer 111 is bonded to the inner wall of the motor housing 30 by pre-compression force to form a low-impedance conductive path. Under severe mechanical vibration or temperature change conditions, it can still maintain efficient conduction between the grounding component 11 and the motor housing, solving the problems of poor contact, resistance fluctuation and EMC (Electromagnetic Compatibility) exceeding the standard caused by vibration in the traditional rigid connection scheme, and significantly extending the system maintenance cycle.

[0036] In one embodiment, the end of the grounding member 11 is provided with at least one conductive through hole, and the motor housing is provided with a grounding terminal. The conductive through hole and the grounding terminal of the motor housing are connected by a wire.

[0037] The grounding component 11 has one or more conductive through holes at its end, which penetrate the end face of the grounding component 11 and are coated with a metal conductive layer on their inner walls. A grounding terminal is located at a corresponding position on the motor housing 30. This grounding terminal can be welded or crimped to the conductive through holes using multi-strand stranded copper wires to form a low-impedance conductive path. This ensures that shaft current is quickly discharged to the motor housing, preventing current from forming an arc through the bearing and significantly extending bearing life. The synergistic effect of the through-hole current conduction and the flexible wire connection maintains efficient and stable conductivity between the grounding component 11 and the motor housing even under severe mechanical vibration and wide temperature range conditions. This solves the failure problem caused by stress concentration in traditional welding or plug-in solutions, while significantly improving the system's maintainability and environmental adaptability.

[0038] In one embodiment, the grounding member 11 is fixedly connected to the current guide member 12 by at least one of the following connection methods: welding, bolting, or snap-fit.

[0039] Optionally, the inner wall of the grounding component 11 and the outer wall of the grounding ring 12 are fixed together by welding to form an integrated conductive path, improving mechanical strength and conductivity; or, the grounding component 11 is provided with a through hole (not shown), through which bolts are passed and locked to the threaded hole of the grounding ring 12, taking into account the convenience of maintenance; or, the inner wall of the grounding component 11 is provided with a protrusion, which engages with the groove on the outer wall of the grounding ring 12, optimizing installation efficiency and vibration resistance. Through a combination of welding, bolts, or snap-fit ​​designs, the connection method between the grounding component 11 and the current-conducting component 12 can be flexibly adapted to different working conditions, ensuring that shaft current is efficiently discharged to the grounding system and avoiding bearing electrolytic corrosion.

[0040] In one embodiment, the contact surface between the current guide 12 and the grounding member 11 is provided with a conductive coating to achieve stable conductivity and reduce contact resistance. The conductive coating is composed of nano-conductive graphite composite material or metal alloy plating (such as silver, nickel, or copper alloy) and is formed by spraying, vacuum coating, or brushing processes.

[0041] In one embodiment, the inner wall of the flow guide 12 is provided with an elastic pressing structure, forming an elastic pressure contact with the outer wall of the grounding member 11. The elastic pressing structure, such as a corrugated rib, a helical spring, or an elastic metal sheet, forms an elastic pressure contact with the outer wall of the grounding member 11. The elastic pressing structure is made of an elastic metal alloy or conductive rubber. When vibration or thermal expansion causes a small displacement of the contact surface, the elastic pressing structure automatically compensates for the gap through elastic deformation, maintaining the contact pressure between the flow guide 12 and the grounding member 11 and avoiding conductive failure due to mechanical loosening. The cyclic deformation capability of the elastic material can resist high-frequency vibration and extend the connection life. Furthermore, a conductive coating, as an auxiliary conductive layer, further reduces contact resistance fluctuations caused by surface oxidation or contamination.

[0042] In one embodiment, the contact surface between the flow guide 12 and the grounding member 11 is provided with a microstructure texture.

[0043] Microstructured textures can be geometric structures such as V-shaped grooves, honeycomb protrusions, grid-like or sawtooth grooves, prepared through laser etching, electrical discharge machining, or micro-injection molding processes. They are used to increase the surface area of ​​the contact surface, resulting in a more uniform current distribution and preventing arcing or hot spots caused by localized current concentration. Microstructured textures optimize the contact interface through geometric design, significantly reducing contact resistance and improving long-term operational stability, making them suitable for high-frequency or high-current applications.

[0044] The drive motor assembly of this embodiment includes a drive shaft, a current guide, a grounding component, and a motor housing. The current guide is rotatably mounted on the drive shaft and electrically connected to the drive shaft via its inner surface. The grounding component is fixed to the outer surface of the current guide, with its inner surface electrically connected to the outer surface of the current guide and its outer surface electrically connected to the motor housing. Through the electrical connection structure between the current guide and the grounding component, the drive motor assembly of this embodiment directs the shaft current generated by the drive shaft to the motor housing via the current guide and the grounding component, thereby preventing current from passing through the bearings and causing electro-corrosion, effectively extending bearing life and improving motor reliability. The fixed structure of the current guide and the grounding component can stably and efficiently suppress shaft current over a long period, requiring no frequent maintenance.

[0045] This application also provides a vehicle, which includes the drive motor assembly described above.

[0046] All the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Any equivalent modifications or substitutions made by those skilled in the art to the technical solutions described in the foregoing embodiments are included within the scope defined by the claims of this application.

Claims

1. A drive motor assembly, characterized in that, It includes a drive shaft (10), a flow guide (12), a grounding member (11), and a motor housing; the flow guide (12) is rotatably sleeved on the drive shaft (10) and electrically connected to the drive shaft (10) through the inner surface of the flow guide (12); the grounding member (11) is fixed to the outer surface of the flow guide (12), the inner surface of the grounding member (11) is electrically connected to the outer surface of the flow guide (12), and the outer surface of the grounding member (11) is electrically connected to the motor housing.

2. The drive motor assembly according to claim 1, characterized in that, The flow guide (12) has an annular structure and at least one elastic protrusion (122) is provided circumferentially along the inner surface of the flow guide (12). The flow guide (12) is electrically connected to the drive shaft (10) through the elastic protrusion (122).

3. The drive motor assembly according to claim 1 or 2, characterized in that, The grounding element (11) is a ring structure or a fan-shaped structure.

4. The drive motor assembly according to claim 2, characterized in that, The inner surface of the guide member (12) is provided with an axial guide groove, which extends along the axial direction of the drive shaft (10) and communicates with the elastic protrusion (122).

5. The drive motor assembly according to claim 1, characterized in that, An elastic conductive layer (111) is provided on the outer surface of the grounding member (11) away from the current guide member (12), and the elastic conductive layer (111) is attached to the inner wall of the motor housing by a pre-compression force.

6. The drive motor assembly according to claim 1, characterized in that, The end of the grounding component (11) is provided with at least one conductive through hole, and the motor housing is provided with a grounding terminal. The conductive through hole is connected to the grounding terminal of the motor housing through a wire.

7. The drive motor assembly according to claim 1, characterized in that, The grounding component (11) is fixedly connected to the flow guide (12) by at least one of the following connection methods: welding, bolting or snap-fit.

8. The drive motor assembly according to claim 7, characterized in that, The inner wall of the flow guide (12) is provided with an elastic pressing structure, which forms an elastic pressure contact with the outer wall of the grounding member (11); and / or, the contact surface between the flow guide (12) and the grounding member (11) is provided with a conductive coating.

9. The drive motor assembly according to claim 7 or 8, characterized in that, The contact surface between the flow guide (12) and the grounding member (11) is provided with a microstructure texture.

10. A vehicle, characterized in that, The vehicle includes a drive motor assembly as described in any one of claims 1 to 9.

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