Grounding structure of electronic oil pump

Abstract

The invention provides a grounding structure of an electronic oil pump, which comprises a circuit board, a grounding terminal, a grounding spring, a stator assembly and a shell, the stator assembly is fixedly arranged in the shell, a stator iron core in the stator assembly is in contact with the shell, the circuit board is arranged at the upper end of the stator assembly, and the grounding terminal is arranged on the circuit board. The upper end of the grounding terminal is connected with a grounding point on the circuit board, and the lower end of the grounding terminal is connected with a stator iron core in the stator assembly through a grounding spring in a compressed state. The circuit board is grounded through the grounding terminal, the grounding spring, the stator core and the shell in sequence, connection between the grounding terminal and the stator core is achieved through the grounding spring in a compressed state, and the situation that grounding failure occurs between the grounding terminal and the stator core due to factors such as vibration can be effectively prevented; and the reliability of connection between the grounding terminal and the stator core is ensured.

Description

Technical Field

[0001] This invention relates to the field of electronic oil pump technology, and more specifically to a grounding structure for an electronic oil pump. Background Technology

[0002] Grounding is a necessary measure to improve the safety of electronic oil pumps. Currently, there are two main ways to ground electronic oil pumps. One way is to directly connect the PCBA (i.e., circuit board) to the motor housing to achieve grounding. The other way is to connect the stator core to the PCBA (i.e., circuit board) through a grounding pin, and then ground the stator core to the motor housing.

[0003] When an electronic oil pump motor adopts an oil-cooled design, the PCBA is immersed in oil. Structurally, the electronic oil pump PCBA cannot be designed to be directly connected to the motor housing; therefore, only a second grounding method can be used. However, in this second grounding method, since the stator core is directly connected to the grounding pin, vibration or other factors may cause a break between the stator core and the grounding pin, leading to grounding failure.

[0004] In summary, there is an urgent need for a grounding structure for electronic oil pumps to solve the problems existing in the current technology. Summary of the Invention

[0005] The purpose of this invention is to provide a grounding structure for an electronic oil pump, aiming to solve the problem of grounding failure that occurs when the stator core is directly connected to the grounding pin under the influence of factors such as vibration. The specific technical solution is as follows: A grounding structure for an electronic oil pump includes a circuit board, a grounding terminal, a grounding spring, a stator assembly, and a housing. The stator assembly is fixedly disposed inside the housing, and the stator core in the stator assembly is in contact with the housing. The circuit board is disposed at the upper end of the stator assembly. The upper end of the grounding terminal is connected to a grounding point on the circuit board, and its lower end is connected to the stator core in the stator assembly through a compressed grounding spring.

[0006] Preferably, the stator assembly further includes an upper frame and a lower frame, which are respectively disposed on both sides of the stator core, and the grounding terminal passes through the upper frame and is fixedly connected to it.

[0007] Preferably, the stator core has a blind mounting hole on the side near the upper frame, the grounding spring is disposed in the blind mounting hole, and the grounding terminal extends through the upper frame into the blind mounting hole so that its lower end is connected to the grounding spring.

[0008] Preferably, the grounding terminal includes a first connecting segment, a widening segment, an intermediate connecting segment, and a second connecting segment arranged sequentially. The first connecting segment is connected to a grounding point on the circuit board. The width of the widening segment is greater than the widths of the first connecting segment and the intermediate connecting segment. The width of the intermediate connecting segment is greater than the width of the second connecting segment. The width of the second connecting segment is less than the inner diameter of the grounding spring. The second connecting segment extends into the grounding spring, and the lower end face of the intermediate connecting segment contacts the upper end face of the grounding spring.

[0009] Preferably, a portion of the grounding terminal is injection molded together with the upper frame.

[0010] Preferably, the intermediate connecting section and the widened section are injection molded together with the upper frame. The upper frame has a circular hole on the side near the stator core for accommodating a portion of the second connecting section. A gap is left between the circular hole and the second connecting section to allow the grounding spring to enter.

[0011] Preferably, the first connecting segment is connected to the grounding point on the circuit board by welding.

[0012] Preferably, the stator core and the housing are interference fit.

[0013] Preferably, it further includes a fixing ring, which is fixedly connected to the housing, and the circuit board is mounted on the fixing ring.

[0014] The application of the technical solution of the present invention has the following beneficial effects: In this invention, the circuit board is grounded sequentially via a grounding terminal, a grounding spring, a stator core, and a housing. The grounding terminal and stator core are connected by a compressed grounding spring, effectively preventing grounding failure due to vibration or other factors. When vibration increases the distance between the grounding terminal and stator core, the compressed grounding spring provides elastic compensation, ensuring the connection remains secure and preventing separation. Furthermore, the interference fit between the stator core and housing ensures a robust and reliable grounding structure, completely eliminating the risk of grounding failure.

[0015] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is an exploded view of the electronic oil pump of the present invention; Figure 2 This is a cross-sectional view of the electronic oil pump of the present invention; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 yes Figure 3 Axonometric view of the grounding terminal; Among them, 10 is the fixing ring, 20 is the circuit board, 30 is the grounding terminal, 31 is the first connecting section, 32 is the widening section, 33 is the intermediate connecting section, 34 is the second connecting section, 40 is the upper frame, 50 is the grounding spring, 60 is the stator core, 70 is the lower frame, and 80 is the housing. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description is provided below, along with preferred embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0019] Example: like Figures 1-4As shown, this embodiment provides a grounding structure for an electronic oil pump, including a circuit board 20, a grounding terminal 30, a grounding spring 50, a stator assembly, and a housing 80. The stator assembly is fixedly disposed inside the housing 80, and the stator core 60 in the stator assembly is in contact with the housing 80. The circuit board 20 is disposed at the upper end of the stator assembly. The upper end of the grounding terminal 30 is connected to the grounding point on the circuit board 20, and its lower end is connected to the stator core 60 in the stator assembly through the grounding spring 50 in a compressed state. That is, the circuit board 20 is connected to the grounding terminal 30 in sequence through the grounding terminal 30. 0. Grounding is achieved through grounding spring 50, stator core 60 and housing 80. The grounding terminal 30 and stator core 60 are connected by the grounding spring 50 in a compressed state, which can effectively prevent grounding failure due to vibration and other factors. When the distance between the grounding terminal and stator core increases due to vibration and the connection fails, the grounding spring in a compressed state can provide elastic compensation to ensure that the grounding terminal and stator core will not separate, thus ensuring the reliability of the connection between the grounding terminal and stator core.

[0020] Furthermore, the stator assembly also includes an upper frame 40 and a lower frame 70, which are respectively disposed on both sides of the stator core 60. The grounding terminal 30 passes through the upper frame 40 and is fixedly connected to it. The upper frame 40, lower frame 70, and stator core 60 constitute the basic structure of the stator assembly. Those skilled in the art are familiar with the function of each component and the specific arrangement of their structures; therefore, this embodiment does not provide a detailed description of the stator assembly. Specifically, the fixed connection between the grounding terminal 30 and the upper frame 40 not only achieves the fixed positioning of the grounding terminal 30 inside the electronic oil pump but also enables the grounding terminal 30 to be connected axially to the stator core 60, ensuring that the grounding terminal 30 does not affect the normal operation of the electronic oil pump.

[0021] like Figure 2 and Figure 3 As shown, the stator core 60 has a blind mounting hole on the side near the upper frame 40. The grounding spring 50 is disposed in the blind mounting hole, and the grounding terminal 30 extends through the upper frame 40 into the blind mounting hole to connect its lower end with the grounding spring 50. The blind mounting hole allows for the accommodation and installation of the grounding spring 50, ensuring that the grounding spring 50 is securely restrained within the blind mounting hole, thus forming a stable grounding connection between the grounding terminal 30 and the stator core 60.

[0022] like Figure 4As shown, the grounding terminal 30 includes a first connecting segment 31, a widening segment 32, an intermediate connecting segment 33, and a second connecting segment 34 arranged sequentially. The width of the widening segment 32 is greater than the widths of the first connecting segment 31 and the intermediate connecting segment 33, and the width of the intermediate connecting segment 33 is greater than the width of the second connecting segment 34. That is, a stepped structure is formed between any two adjacent segments of the grounding terminal 30. Furthermore, the first connecting segment 31 is connected to the grounding point on the circuit board 20, and the width of the second connecting segment 34 is smaller than the inner diameter of the grounding spring 50. The second connecting segment 34 extends into the grounding spring 50, and the lower end face of the intermediate connecting segment 33 contacts the upper end face of the grounding spring 50. Since the second connecting segment 34 is inserted into the interior of the grounding spring 50, it can prevent the grounding terminal 30 from detaching from the grounding spring 50, thus preventing grounding failure.

[0023] like Figure 3 As shown, a portion of the grounding terminal 30 is injection molded together with the upper frame 40; specifically, the intermediate connecting section 33 and a portion of the widened section 32 are injection molded together with the upper frame 40, and a stepped structure is formed between the intermediate connecting section 33 and the widened section 32, which can increase the connection strength between the grounding terminal 30 and the upper frame 40; furthermore, the upper frame 40 has a circular hole on the side near the stator core 60 for accommodating a portion of the second connecting section 34, and a space is left between the circular hole and the second connecting section 34 to allow the grounding spring 50 to enter. The gap, that is, after assembly, the grounding spring 50 can enter the gap between the inner wall of the circular hole and the second connecting section 34, so as to achieve good contact between the upper end face of the grounding spring 50 and the lower end face of the intermediate connecting section 33. This design allows the stator core 60 to achieve the required grounding effect by only opening one blind hole of the specified size. The size of the blind hole can be as close as possible to the outer diameter of the grounding spring 50, so that the blind hole can play a certain restraining effect on the grounding spring 50 and ensure that the grounding spring 50 will not move unnecessarily in the blind hole.

[0024] Preferably, the first connecting segment 31 is connected to the grounding point on the circuit board 20 by welding. Specifically, the first connecting segment 31 is connected to the grounding circuit on the circuit board 20 to achieve the purpose of grounding the circuit board 20.

[0025] Preferably, the grounding terminal 30 is flat or cylindrical, and in this embodiment, the grounding terminal is flat; further, when the grounding terminal 30 is cylindrical, the width dimension of the grounding terminal refers to its diameter dimension.

[0026] Preferably, the stator core 60 and the housing 80 are interference fit, which ensures that the stator core 60 and the housing 80 are fixedly assembled together, and also ensures that the two are in contact to form a grounding effect.

[0027] Preferably, the electronic oil pump further includes a fixing ring 10, which is fixedly connected to the housing 80, and the circuit board 20 is mounted on the fixing ring 10. In this embodiment, the function of the fixing ring 10 is to realize the mounting of the circuit board 20. Other functions of the fixing ring 10 in actual applications are irrelevant to this embodiment. Therefore, this embodiment does not provide a detailed description of its structure and functions that are irrelevant to this embodiment.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A grounding structure for an electronic oil pump, characterized in that, The device includes a circuit board (20), a grounding terminal (30), a grounding spring (50), a stator assembly, and a housing (80). The stator assembly is fixedly disposed inside the housing (80), and the stator core (60) in the stator assembly is in contact with the housing (80). The circuit board (20) is disposed at the upper end of the stator assembly. The upper end of the grounding terminal (30) is connected to the grounding point on the circuit board (20), and its lower end is connected to the stator core (60) in the stator assembly through the grounding spring (50) in a compressed state.

2. The grounding structure of the electronic oil pump according to claim 1, characterized in that, The stator assembly further includes an upper frame (40) and a lower frame (70), which are respectively disposed on both sides of the stator core (60). The grounding terminal (30) passes through the upper frame (40) and is fixedly connected to the other two.

3. The grounding structure of the electronic oil pump according to claim 2, characterized in that, The stator core (60) has a blind mounting hole on the side near the upper frame (40). The grounding spring (50) is disposed in the blind mounting hole. The grounding terminal (30) passes through the upper frame (40) and extends into the blind mounting hole so that its lower end is connected to the grounding spring (50).

4. The grounding structure of the electronic oil pump according to claim 3, characterized in that, The grounding terminal (30) includes a first connecting section (31), a widening section (32), an intermediate connecting section (33), and a second connecting section (34) arranged sequentially. The first connecting section (31) is connected to the grounding point on the circuit board (20). The width of the widening section (32) is greater than the width of the first connecting section (31) and the intermediate connecting section (33). The width of the intermediate connecting section (33) is greater than the width of the second connecting section (34). The width of the second connecting section (34) is less than the inner diameter of the grounding spring (50). The second connecting section (34) extends into the grounding spring (50), and the lower end face of the intermediate connecting section (33) contacts the upper end face of the grounding spring (50).

5. The grounding structure of the electronic oil pump according to claim 4, characterized in that, A portion of the grounding terminal (30) is injection molded together with the upper frame (40).

6. The grounding structure of the electronic oil pump according to claim 5, characterized in that, The intermediate connecting section (33) and the partially widened section (32) are injection molded together with the upper frame (40). The upper frame (40) has a circular hole on the side near the stator core (60) for accommodating a portion of the second connecting section (34). A gap is left between the circular hole and the second connecting section (34) to allow the grounding spring (50) to enter.

7. The grounding structure of the electronic oil pump according to claim 4, characterized in that, The first connecting segment (31) is connected to the grounding point on the circuit board (20) by welding.

8. The grounding structure of the electronic oil pump according to any one of claims 1-7, characterized in that, The stator core (60) and the housing (80) are interference fit.

9. The grounding structure of the electronic oil pump according to any one of claims 1-7, characterized in that, It also includes a fixing ring (10), which is fixedly connected to the housing (80), and the circuit board (20) is mounted on the fixing ring (10).

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