Grounding elastic sheet, driving system and vehicle

Abstract

The utility model provides a grounding elastic piece, a driving system and a vehicle, and relates to the technical field of vehicles. The grounding elastic sheet is used for a driving system. The driving system comprises a motor controller and an electric drive assembly. Wherein the motor controller is provided with a first shell; the electric drive assembly is provided with a second shell; the grounding elastic sheet comprises an annular installation part which is arranged between the first shell and the second shell; the elastic piece is arranged on the annular mounting part, the elastic piece comprises a first connecting part, a second connecting part and a third connecting part which are connected in sequence, the first connecting part and the second connecting part are in contact connection with the second shell, the third connecting part is in contact connection with the first shell, and the second connecting part is in contact connection with the second shell. And the volume miniaturization and the contact conduction reliability of an electric drive product are effectively improved.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and more specifically, to a grounding spring, a drive system, and a vehicle. Background Technology

[0002] As vehicle electric drive products develop towards miniaturization and precision control, the requirements for safety distances and electromagnetic compatibility (EMC) of various components within these products are becoming increasingly stringent.

[0003] However, the electromagnetic compatibility performance of existing electric drive products needs to be improved.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] This disclosure provides a grounding spring, a drive system, and a vehicle that can improve the electromagnetic compatibility performance of electric drive products.

[0006] According to a first aspect of this disclosure, a grounding spring is provided for use in a drive system, the drive system comprising: a motor controller and an electric drive assembly; wherein the motor controller has a first housing; and the electric drive assembly has a second housing;

[0007] The grounding spring includes:

[0008] An annular mounting portion is disposed between the first housing and the second housing;

[0009] An elastic element is disposed on the annular mounting portion. The elastic element includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. The first connecting portion and the second connecting portion are respectively in contact with the second housing, and the third connecting portion is in contact with the first housing.

[0010] In one embodiment of this disclosure, the second connecting portion includes a first bending portion and a supporting portion connected in sequence. The first bending portion is connected to the third connecting portion, the supporting portion is connected to the first connecting portion, and the first bending portion is in contact with the second housing.

[0011] In one embodiment of this disclosure, the second housing has a limiting boss, and when the elastic member is compressed, the first bent portion abuts against the side wall of the limiting boss.

[0012] In one embodiment of this disclosure, the included angle between the first connecting portion and the second connecting portion is smaller than the included angle between the second connecting portion and the third connecting portion.

[0013] In one embodiment of this disclosure, the end of the third connecting portion away from the first bending portion is bent inward toward the annular mounting portion to form a contact portion, and the contact portion is in contact with the first housing.

[0014] In one embodiment of this disclosure, there are multiple elastic elements, and the multiple elastic elements are arranged symmetrically about the center of the annular mounting portion.

[0015] In one embodiment of this disclosure, the first connecting portion is connected to the annular mounting portion, and a crack-prevention groove is provided between the annular mounting portion and the first connecting portion.

[0016] In one embodiment of this disclosure, the annular mounting portion is integrally formed with the elastic element and the crack-resistant groove.

[0017] According to a second aspect of this disclosure, a drive system is provided, comprising:

[0018] The motor controller has a first housing;

[0019] The electric drive assembly has a second housing, and the second housing has a limiting boss;

[0020] The aforementioned grounding spring is disposed between the first housing and the second housing. The second connecting part includes a first bending part and a supporting part connected in sequence. The first bending part is connected to the third connecting part, and the supporting part is connected to the first connecting part. The first bending part abuts against the side wall of the limiting boss.

[0021] According to a third aspect of this disclosure, a vehicle is also provided, including the drive system described in any of the above embodiments.

[0022] The grounding spring, drive system, and vehicle disclosed herein can be provided between the first housing of the motor controller and the second housing of the electric drive assembly. This allows the first housing of the motor controller and the second housing of the electric drive assembly to be electrically connected via the grounding spring, enabling grounding of either housing. This achieves the effect of grounding both, improving the electromagnetic compatibility performance of the electric drive product, reducing the safety distance between components, and facilitating miniaturization. Simultaneously, the copper busbars or cables of the motor controller and motor assembly can be routed through the annular mounting portion, avoiding obstruction of the copper busbars or cables and promoting normal operation of the electric drive product. Furthermore, by providing multiple elastic elements, each with a first connecting portion, a second connecting portion, and a third connecting portion, with the first and second connecting portions respectively contacting and connecting to the second housing, the grounding conductivity between the two housings is improved, and the grounding spring is confined to the second housing, enhancing its installation stability. Additionally, the multiple elastic elements can be compressed, reducing the space occupied by the grounding spring and thus reducing the size of the electric drive product.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1 This is an exploded view of the drive system in one embodiment of this disclosure.

[0026] Figure 2 This is a schematic diagram of the structure of a grounding spring in one embodiment of this disclosure.

[0027] Figure 3 for Figure 1 A partial cross-sectional view of the grounding spring and the second housing during assembly.

[0028] Figure 4 for Figure 1 A partial cross-sectional view of the contact spring during assembly with the first housing, intended to illustrate the first stage of compression of the contact spring.

[0029] Figure 5 for Figure 1A partial cross-sectional view of the grounding spring and the first housing after assembly is shown, intended to illustrate the second-stage compression of the contact spring.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Grounding spring; 11. Annular mounting part; 12. Elastic element; 121. First connecting part; 122. Support part; 123. Third connecting part; 124. Second bending part; 125. First bending part; 126. Contact part; 13. Crack-resistant groove; 2. First housing; 21. First interface; 3. Second housing; 31. Second interface; 32. Limiting boss; 33. Insulating adhesive. Detailed Implementation

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0033] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0034] In related technologies, the housing of electric drive products consists of multiple parts, such as the motor controller housing and the electric drive assembly housing. At the connection between the motor controller housing and the electric drive assembly housing, an insulating sealant is applied, preventing electrical conductivity between them. This significantly reduces the overall grounding effectiveness of the electric drive product housing, thus lowering its electromagnetic compatibility performance. Furthermore, the non-conductive housings are more prone to static electricity accumulation, forcing stricter safety distances between components and hindering the miniaturization of electric drive products.

[0035] To address the aforementioned problems, this disclosure provides a grounding spring 1. See also... Figure 1 , Figure 2 , Figure 4The grounding spring 1 is used in a drive system, which includes a motor controller and an electric drive assembly. The motor controller has a first housing 2, and the electric drive assembly has a second housing 3. The grounding spring 1 includes an annular mounting portion 11 and an elastic element 12. The annular mounting portion 11 is located between the first housing 2 and the second housing 3. The elastic element 12 is located on the annular mounting portion 11 and includes a first connecting portion 121, a second connecting portion, and a third connecting portion 123 connected sequentially in a direction away from the annular mounting portion 11. The end of the first connecting portion 121 away from the second connecting portion is connected to the annular mounting portion 11. The first connecting portion 121 and the second connecting portion are respectively in contact with the second housing 3, and the third connecting portion 123 is in contact with the first housing 2.

[0036] Thus, in the embodiments of this disclosure, a grounding spring 1 can be provided between the first housing 2 of the motor controller and the second housing 3 of the electric drive assembly, so that the first housing 2 of the motor controller and the second housing 3 of the electric drive assembly can be connected through the grounding spring 1. This allows one of the first housing 2 of the motor controller and the second housing 3 of the electric drive assembly to be grounded, achieving the effect of both being grounded. This is beneficial for improving the electromagnetic compatibility performance of the electric drive product, reducing the safety distance between components of the electric drive product, and facilitating the miniaturization of the electric drive product. Simultaneously, the copper busbars or cables of the motor controller and the motor assembly can be passed through the annular mounting portion 11 to avoid obstruction of the copper busbars or cables, which is beneficial for the normal operation of the electric drive product. Furthermore, by providing an elastic element 12, which has a first connecting part 121, a second connecting part, and a third connecting part 123, the first connecting part 121 and the second connecting part are respectively in contact with the second housing 3. On the one hand, by providing three conductive points, the grounding conductivity between the two housings can be improved. On the other hand, the grounding spring 1 is confined between the first housing 2 and the second housing 3, which makes installation simple and improves the stability of the grounding spring 1. On the other hand, the elastic element 12 can be compressed, reducing the space occupied by the grounding spring 1, which is beneficial to reducing the size of the electric drive product.

[0037] In one embodiment of this disclosure, the grounding spring 1 can be used between two adjacent housings that need to be grounded in any product, and is not limited to electric drive products of vehicles.

[0038] In one embodiment of this disclosure, the shape of the annular mounting portion 11 can be a regular ring, such as a circular ring, a square ring, an elliptical ring, etc.; the shape of the annular mounting portion 11 can be an irregular ring, such as an irregular shape composed of multiple curves or broken lines, as long as a ring design is achieved.

[0039] In one embodiment of this disclosure, see Figure 4The second connecting portion includes a first bending portion 125 and a support portion 122 connected in sequence. The first bending portion 125 is connected to a third connecting portion 123, and the support portion 122 is connected to the first connecting portion 121. The first bending portion 125 is in contact with the second housing 3. This contact connection between the first bending portion 125 and the second housing 3 improves conductivity and limiting effect. The first connecting portion 121, the first bending portion 125, the support portion 122, and the third connecting portion 123 can be integrally formed.

[0040] In one embodiment of this disclosure, the second housing has a limiting boss 32, which can be integrally connected to the second housing, and the limiting boss 32 can be square or annular. When the elastic element is compressed, the first bent portion abuts against the side wall of the limiting boss 32, and the annular mounting portion is placed on the second housing. In this way, the limiting boss 32 can limit the elastic element, improving the stability of the grounding spring.

[0041] In one embodiment of this disclosure, the annular mounting portion 11 and the elastic element 12 are integrally formed. For example, the grounding spring 1 can be manufactured by stamping process to reduce material waste and improve material utilization.

[0042] In one embodiment of this disclosure, see Figure 2 The elastic element 12 includes a first connecting portion 121, a second bending portion 124, a support portion 122, a first bending portion 125, and a third connecting portion 123, which are integrally connected in sequence. The end of the first connecting portion 121 away from the second bending portion 124 is connected to the annular mounting portion 11. The angle between the first connecting portion 121 and the support portion 122 is smaller than the angle between the support portion 122 and the third connecting portion 123. An opening is formed between the second connecting portion and the third connecting portion 123. Thus, during assembly, the angles between the first connecting portion 121 and the second connecting portion, and between the second connecting portion and the third connecting portion 123, gradually decrease, facilitating two-stage compression of the elastic element 12 and reducing the space occupied by the grounding spring 1.

[0043] In one embodiment of this disclosure, the included angle between the first connecting portion 121 and the second connecting portion is 30° to 45°. For example, the included angle between the first connecting portion 121 and the second connecting portion is 30°, 32°, 34°, 36°, 38°, 40°, 42°, 44°, or 45°. The included angle between the second connecting portion and the third connecting portion 123 is 80° to 120°. For example, the included angle between the second connecting portion and the third connecting portion 123 is 80°, 84°, 88°, 92°, 96°, 100°, 104°, 108°, 112°, 116°, or 120°. This ensures that the included angles between the first connecting portion 121 and the second connecting portion, and between the second connecting portion and the third connecting portion 123, have suitable angles, facilitating compression of the elastic member 12 after assembly and reducing the space occupied by the elastic member 12.

[0044] In one embodiment of this disclosure, see Figure 2 The end of the third connecting part 123 away from the first bending part 125 is bent toward the inside of the annular mounting part 11 to form a contact part 126. The contact part 126 can contact and connect with the first housing 2, increasing the contact area to improve connection stability and grounding effect.

[0045] In one embodiment of this disclosure, the thickness of the elastic element 12 is the same as the thickness of the annular mounting portion 11, and both are 0.2mm to 0.6mm. For example, the thickness of both the elastic element 12 and the annular mounting portion 11 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 0.6mm. This solves the problem of reduced structural strength and easy deformation caused by excessively small thicknesses of the elastic element 12 and the annular mounting portion 11, while avoiding the problem of increased processing difficulty and cost due to excessively large thicknesses of the elastic element 12 and the annular mounting portion 11. Furthermore, by setting the elastic element 12 and the annular mounting portion 11 to have the same thickness, a stamping process can be used to process the grounding spring 1, making the elastic element 12 and the annular mounting portion 11 integrally connected, reducing processing difficulty and improving material utilization.

[0046] In one embodiment of this disclosure, there can be multiple elastic elements 12, which are symmetrically arranged about the center of the annular mounting portion 11. Through cooperation with the limiting boss 32, the limiting effect of the grounding spring 1 is further improved. The multiple elastic elements 12 have the same width, ranging from 1mm to 3mm. For example, the width of the multiple elastic elements 12 can be 1mm, 1.5mm, 2mm, 2.5mm, or 3mm. In other words, the widths of the first connecting portion 121, the supporting portion 122, the third connecting portion 123, the second bending portion 124, the first bending portion 125, and the contact portion 126 in one elastic element 12 are all the same. This improves the structural strength of the elastic element 12 while reducing its processing difficulty.

[0047] In one embodiment of this disclosure, the number of elastic elements 12 is multiple. For example, the number of elastic elements 12 can be two, three, four, five, etc., depending on the specific needs, and is not limited here. In this way, the structural strength and conductivity of the grounding spring 1 can be improved.

[0048] In one embodiment of this disclosure, the grounding spring 1 can be made of a low resistivity elastic metal or alloy material, such as copper or stainless steel.

[0049] In one embodiment of this disclosure, see Figure 2 A crack-prevention groove 13 is provided between the annular mounting portion 11 and the first connecting portion 121. This prevents the elastic element 12 from tearing off the annular mounting portion 11, thereby improving the reliability of the grounding spring 1.

[0050] In one embodiment of this disclosure, the length of the crack-stopping groove 13 is 0.8mm to 1.2mm. For example, the length of the crack-stopping groove 13 can be 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, or 1.2mm, to prevent the crack-stopping effect from being reduced due to the length of the crack-stopping groove 13 being too small, and also to prevent the structural strength from being reduced due to the length of the crack-stopping groove 13 being too large. The width of the crack-stopping groove 13 is 0.4mm to 1mm. For example, the width of the crack-stopping groove 13 can be 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm, to prevent the processing difficulty from being increased due to the width of the crack-stopping groove 13 being too small, and also to prevent the structural strength from being reduced due to the width of the crack-stopping groove 13 being too large.

[0051] This disclosure also provides a drive system, including a motor controller, an electric drive assembly, a connector, and a grounding spring 1 as described in any of the above embodiments. An insulating layer is provided between the motor controller and the electric drive assembly, and the motor controller and the electric drive assembly are electrically connected through the grounding spring 1. See also... Figure 1 , Figure 4 , Figure 5 The motor controller includes a controller body and a first housing 2. The controller body is disposed in the first housing 2, and the first housing 2 has a first interface 21. The electric drive assembly includes a drive body and a second housing 3. The drive body is disposed in the second housing 3, and the second housing 3 has a second interface 31. The first interface 21 and the second interface 31 are connected. The annular mounting part 11 is disposed in one of the first housing 2 and the second housing 3, and the elastic member 12 contacts the other of the first housing 2 and the second housing 3. The controller body and the drive body are connected by a connector. The connector passes through the first interface 21, the annular mounting part 11, and the second interface 31, and has a gap with the annular mounting part 11.

[0052] Thus, the first housing 2 and the second housing 3 are connected by the grounding spring 1 to facilitate grounding of the first housing 2 and the second housing 3, thereby improving the electromagnetic compatibility performance of the drive system. The controller body and the drive body are connected by a connector, and the annular mounting part 11 provides clearance for the connector so that the grounding spring 1 does not affect the normal operation of the drive system. It is understood that the drive system has all the beneficial effects of the aforementioned grounding spring 1.

[0053] In one embodiment of this disclosure, the connector includes a copper busbar or cable or a combination of copper busbar and cable to achieve an electrical connection between the controller body and the drive body.

[0054] In one embodiment of this disclosure, see Figure 1 , Figure 3 , Figure 4 , Figure 5 The second housing 3 is provided with a limiting boss 32, which is annular and surrounds the second interface 31. The annular mounting part 11 is located on the second housing 3. This facilitates the installation of the annular mounting part 11 on the second housing 3. In some other embodiments of this disclosure, the limiting boss 32 may also be provided on the first housing 2.

[0055] In one embodiment of this disclosure, see Figure 1 , Figure 5After the first housing 2, the second housing 3, and the grounding spring 1 are assembled, the first bent portion 125 abuts against the side wall of the limiting boss 32, and the contact portion 126 abuts against the side of the first housing 2 near the second housing 3. The first interface 21, the second interface 31, the annular mounting portion 11, and the limiting boss 32 have the same shape. In this way, the elastic element 12 is confined on the second housing 3, thereby reducing the space occupied by the elastic element 12 and improving structural stability. In addition, the installation of the grounding spring 1 is simple and easy to operate, requiring no additional assembly and connection process, thus reducing costs and increasing efficiency.

[0056] In one embodiment of this disclosure, see Figure 1 , Figure 3 The annular mounting portion 11 and the sidewall of the limiting boss 32 have a gap of 0.3mm to 1mm. For example, the gap can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or 1mm. This prevents the profile requirements of the stamping process from being too small, while also preventing the structural strength from being reduced due to an excessively large gap.

[0057] In one embodiment of this disclosure, the insulating layer may be an insulating adhesive, see [link to relevant documentation]. Figure 1 The second housing 3 is connected to the first housing 2 via insulating adhesive 33 surrounding the second interface 31, and the insulating adhesive 33 is disposed on the limiting boss 32. Thus, electrical conduction is achieved between the motor controller and the electric drive assembly via the grounding spring 1. In one example, the insulating adhesive 33 is disposed on the side of the second housing 3 closest to the first housing 2. In another example, the insulating adhesive 33 may be disposed on the side of the first housing 2 closest to the second housing 3. In this way, the first housing 2 and the second housing 3 can be sealed together by the insulating adhesive 33.

[0058] The following is combined Figures 3-5 The assembly process of the drive system is described below:

[0059] exist Figure 3 When the grounding spring 1 is in a free state, the contact part 126 does not contact the first housing 2.

[0060] During the installation of grounding spring 1, see Figure 4 When the first housing 2 is assembled to the second housing 3, the contact part 126 contacts the side of the first housing 2 near the second housing 3. The contact part 126 is subjected to pressure transmission, which reduces the angle between the first connecting part 121 and the supporting part 122, thereby causing the first bending part 125 to abut against the side wall of the limiting boss 32, so as to achieve the first stage of compression of the elastic member 12.

[0061] See Figure 5After the first bending portion 125 abuts against the side wall of the limiting boss 32, the included angle between the first connecting portion 121 and the supporting portion 122 no longer decreases. At this time, the included angle between the supporting portion 122 and the third connecting portion 123 begins to decrease until the first housing 2 reaches the designated position and is connected to the second housing 3 by the insulating adhesive 33, thereby achieving the second stage of compression of the elastic element 12. Since the elastic element 12 undergoes two stages of compression, the grounding spring 1 occupies less space under the same compression amount, which is beneficial to the miniaturization of the drive system.

[0062] See Figure 5 After installation, the contact part 126 abuts against the side of the first housing 2 near the second housing 3, and the first bent part 125 abuts against the side wall of the limiting boss 32, so that the grounding spring 1 is limited between the first housing 2 and the second housing 3, thereby improving the conductivity reliability of the grounding spring 1.

[0063] This disclosure also provides a vehicle, which can be a new energy electric vehicle, a new energy hybrid vehicle, a subway, a high-speed train, or other similar vehicle. The vehicle includes a body and a drive system as described in any of the above embodiments, with the drive system located on the body. This vehicle possesses all the beneficial effects of the aforementioned drive system.

[0064] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A grounding spring, characterized in that, The grounding spring is used in a drive system, which includes a motor controller and an electric drive assembly; wherein the motor controller has a first housing; and the electric drive assembly has a second housing. The grounding spring includes: An annular mounting portion is disposed between the first housing and the second housing; An elastic element is disposed on the annular mounting portion. The elastic element includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. The first connecting portion and the second connecting portion are respectively in contact with the second housing, and the third connecting portion is in contact with the first housing.

2. The grounding spring according to claim 1, characterized in that, The second connecting part includes a first bending part and a support part connected in sequence. The first bending part is connected to the third connecting part, the support part is connected to the first connecting part, and the first bending part is in contact with the second housing.

3. The grounding spring according to claim 2, characterized in that, The second housing has a limiting boss, and when the elastic element is compressed, the first bent portion abuts against the side wall of the limiting boss.

4. The grounding spring according to claim 1, characterized in that, The angle between the first connecting part and the second connecting part is smaller than the angle between the second connecting part and the third connecting part.

5. The grounding spring according to claim 2, characterized in that, The third connecting portion is bent inward toward the annular mounting portion at one end away from the first bending portion to form a contact portion, and the contact portion is in contact with the first housing.

6. The grounding spring according to claim 1, characterized in that, The number of elastic elements is multiple, and the multiple elastic elements are symmetrically arranged about the center of the annular mounting portion.

7. The grounding spring according to claim 1, characterized in that, The first connecting part is connected to the annular mounting part, and a crack-prevention groove is provided between the annular mounting part and the first connecting part.

8. The grounding spring according to claim 7, characterized in that, The annular mounting portion is integrally formed with the elastic element and the crack-resistant groove.

9. A drive system, characterized in that, include: The motor controller has a first housing; The electric drive assembly has a second housing, and the second housing has a limiting boss; The grounding spring according to any one of claims 1 to 8 is disposed between the first housing and the second housing, and the second connecting part includes a first bending part and a supporting part connected in sequence, the first bending part is connected to a third connecting part, the supporting part is connected to the first connecting part, and the first bending part abuts against the side wall of the limiting boss.

10. A vehicle, characterized in that, Includes the drive system as described in claim 9.

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