Plastic housing electronic oil pump

Abstract

The utility model provides a kind of plastic shell electronic oil pump, including plastic shell, motor stator, PCB board, metal back cover, ground terminal and ground copper bar;The lower end of ground terminal is connected with motor stator core, and upper end is welded with PCB board;Metal insert is injection molded outside plastic shell;One end of ground copper bar is welded with PCB board, and the other end is connected with metal insert.The electronic oil pump provided by the utility model has the advantages of lightweight, high power density, low cost, etc., and can meet the CLASS3 requirement of EMC parts.

Description

Technical Field

[0001] This utility model relates to the field of lubrication technology for new energy vehicles, specifically to an electronic oil pump with a plastic housing. Background Technology

[0002] With the increasing popularity of new energy vehicles, the application of electronic fuel pumps is becoming more widespread. As the price of new energy vehicles continues to decline, new demands are being placed on the price of electronic fuel pumps. To meet market demands for low cost, high power, and lightweight design, the use of plastic housings for electronic fuel pumps has become a trend. This offers advantages such as a 20% reduction in overall weight and cost. While plastic housings reduce weight and cost, they also introduce new EMC grounding issues. Metal housings can be directly grounded to the electric drive assembly, but plastic housings cannot. Furthermore, new energy vehicles contain numerous electronic components, requiring EMC compliance with CLASS3 and above. Therefore, a reliable grounding solution for plastic housings needs to be redesigned. Utility Model Content

[0003] The purpose of this invention is to provide an electronic oil pump with a plastic housing that facilitates EMC grounding.

[0004] The technical solution of this utility model is: a plastic housing electronic oil pump, including a plastic housing, a motor stator, a PCB board, a metal back cover, a grounding terminal and a grounding copper busbar; the lower end of the grounding terminal is connected to the iron core of the motor stator, and the upper end is welded to the PCB board; a metal insert is injection molded on the outside of the plastic housing; one end of the grounding copper busbar is welded to the PCB board, and the other end is connected to the metal insert.

[0005] Furthermore, a metal spring is soldered onto the PCB board, and the upper end of the metal spring contacts and engages with the metal back cover.

[0006] Preferably, the plastic housing and the motor stator are integrally injection molded structures.

[0007] In one embodiment, the grounding copper busbar is interference-fitted with a metal insert.

[0008] In one embodiment, the metal insert is grounded to the electric drive assembly via mounting bolts.

[0009] This utility model connects the stator core and the PCB board through a grounding terminal, and connects the metal back cover to the PCB board through a metal spring. The PCB board is then connected to the metal insert through a grounding copper busbar, and the metal insert is then grounded to the electric drive assembly through mounting bolts. In this way, the grounding of all components that affect the EMC of the electronic oil pump can be connected to the grounding of the electric drive assembly.

[0010] The electronic oil pump provided by this utility model has the advantages of being lightweight, having high power density, and being low cost, and can meet the CLASS3 requirements for EMC of components. Attached Figure Description

[0011] Figure 1 This is a schematic cross-sectional view of the electronic oil pump in an embodiment of the present utility model;

[0012] Figure 2 This is a schematic diagram of the overall exploded structure of the electronic oil pump in this embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of the connection structure between the plastic shell and the grounding copper busbar in an embodiment of this utility model;

[0014] Figure 4 This is a schematic diagram of the connection structure of the grounding terminal and the grounding copper busbar in an embodiment of this utility model;

[0015] The attached figures are labeled as follows:

[0016] 1. Plastic housing; 2. Motor stator; 3. PCB board; 4. Metal back cover; 5. Grounding terminal; 6. Grounding copper busbar; 7. Metal insert; 8. Metal spring. Detailed Implementation

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0018] It should be noted in advance that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] like Figures 1 to 4 As shown, an electronic oil pump with a plastic housing includes a plastic housing 1, a motor stator 2, a PCB board 3, a metal back cover 4, a grounding terminal 5, and a grounding copper busbar 6. The lower end of the grounding terminal 5 is connected to the iron core of the motor stator 2, and the upper end is welded to the PCB board 3. Two Z-shaped metal springs 8 are welded upwards on the PCB board 3, and the upper ends of the metal springs 8 are in contact with the metal back cover 4. The plastic housing and the motor stator 2 are integrally injection molded structures, and a metal insert 7 is injection molded on the outside of the plastic housing 1. The grounding copper busbar 6 is roughly L-shaped, with one end welded to the PCB board 3 and the other end interference-fitted to the metal insert 7. The metal insert 7 can be grounded to the electric drive assembly through mounting bolts.

[0020] In this embodiment, the stator core and PCB board 3 are connected through grounding terminal 5, and the metal back cover 4 is connected to PCB board 3 through metal spring 8. PCB board 3 is then connected to metal insert 7 through grounding copper busbar 6. Metal insert 7 is then grounded to electric drive assembly through mounting bolts. In this way, the grounding of all components affecting the EMC of the electric oil pump can be connected to the grounding of the electric drive assembly, so that the electric oil pump has the advantages of lightweight, high power density and low cost, and can meet the CLASS3 requirements of component EMC.

[0021] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

[0022] To facilitate understanding by those skilled in the art of the improvements of this utility model over the prior art, some of the drawings and descriptions of this utility model have been simplified, and for clarity, some other elements have been omitted from this application. Those skilled in the art should realize that these omitted elements may also constitute the content of this utility model.

Claims

1. A plastic-cased electronic oil pump, characterized in that: It includes a plastic housing (1), a motor stator (2), a PCB board (3), a metal back cover (4), a grounding terminal (5), and a grounding copper busbar (6); the lower end of the grounding terminal (5) is connected to the iron core of the motor stator (2), and the upper end is welded to the PCB board (3); the plastic housing (1) is injection molded with a metal insert (7); one end of the grounding copper busbar (6) is welded to the PCB board (3), and the other end is connected to the metal insert (7).

2. The plastic-cased electronic oil pump according to claim 1, characterized in that: A metal spring (8) is also soldered onto the PCB board (3), and the upper end of the metal spring (8) contacts and engages with the metal back cover (4).

3. The plastic-cased electronic oil pump according to claim 1 or 2, characterized in that: The plastic housing and the motor stator (2) are integrally injection molded structures.

4. The plastic-cased electronic oil pump according to claim 1 or 2, characterized in that: The grounding copper busbar (6) is interference-fitted with the metal insert (7).

5. The plastic-cased electronic oil pump according to claim 1 or 2, characterized in that: The metal insert (7) is grounded to the electric drive assembly via mounting bolts.

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