Pump and electric automobile
By using grounding pins and a motor housing made of conductive material between the circuit board and the stator core, the problem of grounding failure caused by vibration of the conductive spring is solved, and stable grounding between the circuit board and the motor housing is achieved, improving assembly efficiency and reliability.
Patent Information
- Application Number
- CN202511150880.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2025-11-07
AI Technical Summary
In pumps and electric vehicles, conductive spring contacts may fail to maintain stable contact due to factors such as vibration, resulting in grounding failure.
A grounding pin is used to connect the grounding terminal of the circuit board to the stator core, and a stable connection between the circuit board and the motor housing is achieved through a motor housing made of conductive material, eliminating the need for conductive springs.
Ensure stable grounding between the circuit board and the motor housing to avoid grounding failure, improve assembly efficiency, and prevent missing parts.
Smart Images
Figure CN120915067A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of pump technology, and more particularly to pumps and electric vehicles. Background Technology
[0002] In pumps, the grounding scheme for circuit boards typically includes the following two:
[0003] 1. Connect the grounding terminal of the circuit board and the metal back cover through a conductive spring contact, and connect the metal back cover to the external grounding terminal;
[0004] 2. The grounding terminal of the circuit board is connected to the grounding pin, and the grounding pin and the metal motor housing are connected through the conductive spring. The metal motor housing is connected to the external grounding terminal.
[0005] Both of the above grounding schemes use conductive springs to ground the circuit board. However, conductive springs rely on deformation to maintain contact, and after long-term use, they are prone to failure to maintain stable contact due to factors such as vibration and elastic decay, leading to grounding failure. Summary of the Invention
[0006] One objective of this application is to provide a pump that solves the problem that grounding failure is easily caused by using conductive springs for grounding.
[0007] To achieve the above objectives, embodiments of this application provide a pump, comprising:
[0008] Pump body;
[0009] A junction box, wherein a circuit board is installed inside the junction box;
[0010] An electric motor, comprising a motor housing and a stator assembly disposed inside the motor housing, the motor housing being made of a conductive material, the motor housing having a first end and a second end disposed opposite to each other, the first end being connected to the pump body and the second end being connected to the junction box, the stator assembly comprising a stator core, the stator core being in contact with and fixed to the motor housing;
[0011] A grounding pin, one end of which is inserted into the grounding hole of the circuit board, and the other end of which is inserted into the socket of the stator core.
[0012] Another objective of this application is to provide an electric vehicle that solves the problem that grounding failure is easily caused by using conductive springs for grounding.
[0013] To achieve the above objectives, embodiments of this application provide an electric vehicle, including:
[0014] The aforementioned pump;
[0015] The electric drive system comprises a ground shell made of metal material, and the motor shell is electrically connected to the ground shell.
[0016] Compared with the prior art, the pump and the electric vehicle according to the embodiments of the present application at least have the following beneficial effects:
[0017] The ground end of the circuit board is connected to the stator core through the ground pin, and the stator core is in contact with the motor shell made of conductive material, so that a ground passage between the circuit board and the motor shell is realized, and the motor shell can be connected to an external ground end to realize the grounding of the circuit board. Compared with the scheme of using a conductive spring sheet in the prior art, the embodiments of the present application use a ground pin to connect between the ground end of the circuit board and the stator core, ensuring stable conduction between the two. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 A schematic diagram of a pump according to an embodiment of the present application is shown.
[0019] Figure 2 An exploded view of a pump according to an embodiment of the present application is shown.
[0020] Figure 3 An exploded view of a circuit board, an isolation seat, a ground pin, a plastic framework and a stator core according to an embodiment of the present application is shown.
[0021] Figure 4 An assembly view of a circuit board, a ground pin and a stator core according to an embodiment of the present application is shown.
[0022] Figure 5 A schematic diagram of a ground pin according to an embodiment of the present application is shown.
[0023] In the drawings:
[0024] 20, motor; 21, motor shell; 211, first end; 212, second end; 22, stator assembly; 221, stator core; 2211, insertion hole; 222, plastic framework; 23, rotor assembly;
[0025] 31, circuit board; 311, ground hole;
[0026] 40, isolation seat; 41, sealing ring;
[0027] 50, ground pin; 51, fish-eye plug;
[0028] 60, three-phase pin. DETAILED DESCRIPTION
[0029] The technical solutions of the present application will be further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all.
[0030] Some orientation words are defined in the present application. Unless otherwise stated, the orientation words such as "upper", "lower", "left", "right", "inner", "outer" are used for the convenience of understanding, and thus do not constitute a limitation on the scope of protection of the present application.
[0031] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.
[0032] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0033] Embodiments of the present application relate to a pump. For example, the pump can be an electronic oil pump.
[0034] As shown in Figure 1 The pump comprises a pump body (not shown), a motor 20 and a terminal box (not shown) arranged in sequence along the axial direction, i.e. the motor 20 is connected between the pump body and the terminal box. The motor 20 is used to drive the pump body to work, and the terminal box is used to control the motor 20 to work. It should be noted that the present application does not involve the improvement of the pump body, and the structure of the pump body will not be described again.
[0035] As shown in Figure 2As shown, the motor 20 comprises a motor shell 21, a stator assembly 22 and a rotor assembly 23. The motor shell 21 is a cylinder with two open ends, the motor shell 21 has a first end 211 and a second end 212 arranged oppositely, the first end 211 is connected to the pump body, and the second end 212 is connected to the terminal box. The stator assembly 22 is arranged inside the motor shell 21, and the stator assembly 22 comprises a stator core 221, a plastic skeleton 222 and a stator winding (not shown). The stator core 221 is in contact with the motor shell 21 and is fixed, for example, the stator core 221 and the motor shell 21 are fixed to each other by interference fit. The rotor assembly 23 is arranged inside the stator assembly 22, and the rotor assembly 23 can rotate relative to the stator assembly 22, and the rotor assembly 23 is used to drive the pump body to work.
[0036] As shown in Figure 2 , the terminal box is internally provided with a circuit board 31, and the circuit board 31 is used to drive the motor 20 to work. Specifically, the circuit board 31 and the stator assembly 22 are provided with three-phase pins 60 and ground pins 50. One end of the three-phase pin 60 is connected to the circuit board 31, and the other end of the three-phase pin 60 is connected to the stator winding. One end of the ground pin 50 is connected to the ground end of the circuit board 31, and the other end of the ground pin 50 is connected to the stator core 221.
[0037] It should be noted that in the embodiment of the present application, the motor shell 21 is made of conductive material (for example, aluminum), and the stator core 221 is in contact with the motor shell 21, so that the circuit board 31 and the motor shell 21 are electrically connected through the ground pin 50 and the stator core 221. The motor shell 21 can be used to connect the external ground end, so that the static electricity and other electrical signals on the circuit board 31 can be introduced into the external ground end in turn through the ground pin 50, the stator core 221 and the motor shell 21.
[0038] Compared with the scheme of using conductive spring in the prior art, the ground pin 50 is used to connect between the ground end of the circuit board 31 and the stator core 221 in the embodiment of the present application, which ensures stable conduction between the two, and solves the problem that the conductive spring easily causes grounding failure.
[0039] In addition, it should also be noted that in the embodiment of the present application, the ground pin 50 and the stator core 221 are the only grounding path between the circuit board 31 and the motor shell 21. No additional connecting members such as conductive springs are arranged between the ground pin 50 and the motor shell 21.
[0040] As shown in Figure 2 and Figure 3 , when the pump is an electronic oil pump, the pump can further comprise an isolation seat 40 arranged between the motor shell 21 and the terminal box, separating the cavity inside the motor shell 21 and the cavity inside the terminal box, and the ground pin 50 is arranged in the isolation seat 40.
[0041] The isolation seat 40 can be made of an insulating material (plastic) for example. One or more sealing rings 41 can be provided on the outer periphery of the isolation seat 40 so as to seal the cavities of the motor housing 21 and the junction box when the isolation seat 40 is mounted to the motor housing 21 and the junction box.
[0042] When the isolation seat 40 is made of plastic for example, the isolation seat 40 can be integrally formed with the grounding pin 50. Specifically, the grounding pin 50 can be embedded in the isolation seat 40 as an insert. In this way, when the motor housing 21, the isolation seat 40 and the junction box are assembled, the connection between the circuit board 31 and the stator core 221 can be completed at the same time, and the assembly step of additionally mounting the grounding pin 50 is omitted. Compared with the conductive spring sheet in the prior art, not only the assembly efficiency is improved, but also the problem of missing the conductive spring sheet is prevented.
[0043] As shown in Figure 3 , one or more insertion holes 2211 are provided on the stator core 221, and the insertion holes 2211 are used to connect the grounding pin 50. For example, in Figure 3 , there are multiple insertion holes 2211, and the multiple insertion holes 2211 are arranged around the circumferential direction of the stator core 221.
[0044] In addition, as shown in Figure 3 , one or more grounding holes 311 are provided on the circuit board 31, and the grounding holes 311 are used to connect the grounding pin 50. For example, in Figure 3 , there are multiple grounding holes 311.
[0045] As shown in Figure 4 , one end (upper end) of the grounding pin 50 is inserted into the grounding hole 311 of the circuit board 31, and the other end (lower end) of the grounding pin 50 is inserted into the insertion hole 2211 of the stator core 221.
[0046] As shown in Figure 5 , the end of the grounding pin 50 is one or more fish-eye plugs 51. By providing the fish-eye plug 51, stable contact between the grounding pin 50 and the circuit board 31 and between the grounding pin 50 and the stator core 221 can be ensured.
[0047] As shown in Figure 3 , a plastic framework 222 is fixedly provided on the stator core 221 and at least partially covers one end of the stator core 221 facing the circuit board 31, and the plastic framework 222 is provided with a guide channel corresponding to the insertion hole 2211, and the grounding pin 50 is arranged in the guide channel.
[0048] The embodiment of the present application also relates to an electric vehicle (not shown). The electric vehicle comprises the pump and the electric drive system described above, the electric drive system comprises a grounding shell made of metal material, and the motor shell 21 is electrically connected to the grounding shell. For the pump, the grounding shell corresponds to an external grounding end, and when the motor shell 21 of the pump is connected to the grounding shell, the grounding of the circuit board 31 is realized.
[0049] Although the present application has been described in detail with general description, specific embodiments and experiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, all belong to the scope of the present application claimed.
Claims
1. Pump, characterized in that The pump comprises: a pump body; a terminal box, which is internally provided with a circuit board (31); a motor (20), which comprises a motor shell (21) made of conductive material and a stator assembly (22) arranged inside the motor shell (21), the motor shell (21) having oppositely arranged first and second ends (211) and (212), the first end (211) being connected to the pump body, the second end (212) being connected to the terminal box, the stator assembly (22) comprising a stator core (221) in contact with and fixed to the motor shell (21); a grounding pin (50), one end of which is inserted into a grounding hole (311) of the circuit board (31), and the other end of which is inserted into a plug hole (2211) of the stator core (221).
2. The pump of claim 1, wherein The pump further comprises: an isolation seat (40) arranged between the motor shell (21) and the terminal box, separating the cavity inside the motor shell (21) from the cavity inside the terminal box, the grounding pin (50) being arranged in the isolation seat (40).
3. The pump of claim 2, wherein, The isolation seat (40) is made of insulating material.
4. The pump of claim 3, wherein The isolation seat (40) is made of plastic and is integrally formed with the grounding pin (50).
5. The pump of any one of claims 1 to 4, wherein, The end of the grounding pin (50) is one or more fisheye plugs (51).
6. The pump of any one of claims 1 to 4, wherein, The stator core (221) and the motor shell (21) are fixed to each other by interference fit.
7. The pump of any one of claims 1 to 4, wherein, The grounding pin (50) and the stator core (221) are the only grounding passage between the circuit board (31) and the motor shell (21).
8. The pump of any one of claims 1 to 4, wherein, The stator core (221) is provided with a plurality of plug holes (2211) arranged around the circumferential direction of the stator core (221).
9. The pump of any one of claims 1 to 4, wherein, The stator assembly (22) further comprises a plastic framework (222) fixedly arranged on the stator core (221) and at least partially covering one end of the stator core (221) facing the circuit board (31), the plastic framework (222) being provided with a guide channel corresponding to the plug hole (2211), and the grounding pin (50) being arranged in the guide channel.
10. An electric vehicle, characterized by The pump comprises: any one of claims 1-9; an electric drive system, which comprises a grounding shell made of metal material, and the motor shell (21) is electrically connected to the grounding shell.