Electronic oil pump device

Abstract

The utility model provides an electronic oil pump device which comprises a pump shell rotor assembly, a stator assembly and a circuit board assembly, a front end cover and a rear end cover are arranged at the two ends of a pump shell, a mounting plate perpendicular to a middle shaft is arranged in a cavity of the pump shell, a circuit board is connected with the mounting plate, and an oil way through hole is formed in the mounting plate; a cooling oil way penetrating through the two axial ends of a rotor shaft of the rotor assembly is arranged in the rotor shaft, one end of the rotor shaft abuts against the mounting plate, the other end of the rotor shaft abuts against the rear end cover, an end cover oil hole is formed in the center of the rear end cover, and an opening, in the end face of the rotor shaft, of the cooling oil way communicates with the oil way through hole structure of the mounting plate and the end cover oil hole of the rear end cover. Complete oil circulation in the space where the circuit board is located is guaranteed, it is guaranteed that cooling oil flows through the circuit board to be continuously cooled, the working environment needed by the circuit board is fully met, heat dissipation glue does not need to be arranged by being matched with the circuit board, other waterproof ventilation structures do not need to be arranged for rust prevention, and other additional structures needed by arrangement of the circuit board are greatly simplified.

Description

Technical Field

[0001] This utility model relates to the field of motor and pump technology, and more specifically, to an electronic oil pump device. Background Technology

[0002] With the trends of vehicle electrification and energy conservation, electronic oil pumps (EOPs) have become a key technological solution. Their core is the direct electric drive of the oil pump by an electric motor, achieving electronic control. Typical application scenarios include:

[0003] Hybrid / Electric Vehicles: Maintain lubrication system pressure (e.g., transmission, bearing cooling) when the engine is off. Automatic Start-Stop System: Reduce frictional losses during engine restart. Intelligent Hydraulic System: Adjust oil pressure as needed to reduce energy consumption (e.g., variable displacement oil pump).

[0004] Currently, electronic oil pumps use a dry-wet separation method, where the pump motor side is the oil-immersed area, and the PCBA section is the dry area (not immersed in oil). This dry-wet separation involves a sealing design that prevents oil from leaking into the dry area. This design has the following drawbacks:

[0005] Adding various sealing structures required for wet and dry sealing, such as O-rings and sealants at the junction of wet and dry zones, ensures the integrity of each zone. However, due to the limitations of the wet and dry zone sealing structures, the design of the zone isolation structure requires a certain amount of space, increasing the axial length of the pump assembly and hindering the overall pump layout design. The dry zone needs additional functional components such as waterproof and breathable valves to prevent water ingress and corrosion, further complicating the design's adaptation structure. Without wet and dry separation, the oil environment within the pump chamber cannot meet the environmental requirements for the PCBA, especially the PCBA's cooling requirements. Directly connecting the PCBA area to the oil delivery area would affect the pump's internal circulation and make it difficult to provide sufficient cooling for the circuit components.

[0006] In summary, existing electronic oil pump designs suffer from technical problems such as large space requirements and complex structures. Utility Model Content

[0007] The technical problem to be solved by this utility model is that existing electronic oil pump designs have problems such as large space occupation and complex structure.

[0008] To address the aforementioned problems, this utility model provides an electronic oil pump device, comprising a pump housing and a rotor assembly and a stator assembly located within the cavity of the pump housing. A circuit board assembly is disposed at one end of the pump housing, and a front end cover and a rear end cover are respectively installed at both ends of the pump housing. A mounting plate perpendicular to the central axis of the rotor assembly is disposed within the cavity of the pump housing, and the circuit board assembly is mounted and fixed on the mounting plate. The mounting plate has an oil passage through-hole structure connecting the spaces on both sides of the mounting plate. The rotor assembly includes a rotor shaft located at the center, and a cooling oil passage is disposed within the rotor shaft, extending through both axial ends. One end of the rotor shaft abuts against the mounting plate, and the other end of the rotor shaft abuts against the rear end cover. An end cover oil hole connecting to an external oil passage is disposed at the center of the rear end cover. The opening of the cooling oil passage on the end face of the rotor shaft connects to the oil passage through-hole structure of the mounting plate and the end cover oil hole of the rear end cover.

[0009] The technical solution provided by this utility model improves the overall layout of a general oil pump design. The internal space of the pump, where the circuit board assembly is located, is no longer sealed and partitioned with the pump rotor and stator, allowing the circuit board assembly to be situated within the pump's oil environment. Specifically, a vertically oriented mounting plate is installed inside the pump housing. This mounting plate is used to fix the circuit board assembly within the pump housing but does not provide a sealing or isolation function. An oil passage structure is provided on the mounting plate to connect the space where the circuit board is located with the space where the rotor and stator are located. Furthermore, a through-type cooling oil passage is provided inside the rotor shaft. The two ends of this cooling oil passage connect the circuit board space with external cooling oil passages, specifically through the end cap oil holes of the rear end cover. This design ensures that the space where the circuit board is located... The space features a complete oil circulation system, ensuring a stable supply of cooling oil to the circuit board during pump operation, continuously cooling the board and fully meeting its operating environment requirements. Furthermore, it eliminates the need for thermal paste on the circuit board and other waterproof and ventilated structures for rust prevention, significantly simplifying the circuit board layout. Additionally, the elimination of a dedicated internal seal for the circuit board space reduces the need for additional sealing structures like sealing rings to isolate the pump's internal space. The corresponding non-internal partition design also significantly reduces the overall axial length of the pump body, lowering the pump's installation standards. In summary, this design effectively solves the technical problems of existing electronic oil pump designs, such as large space requirements and complex structures.

[0010] As a preferred embodiment, the inner peripheral wall of the pump housing is provided with a stepped surface structure corresponding to the position of the mounting plate, and the side edge of the mounting plate abuts against the stepped surface structure. This design optimizes the fixation of the circuit board assembly within the pump housing by optimizing the fixation method between the mounting plate and the pump housing. A stepped surface structure is provided at a corresponding axial position within the pump housing, providing a fixed position between the mounting plate and the pump housing and ensuring the axial position of the mounting plate is fixed.

[0011] As a preferred embodiment, the circuit board assembly is installed and fixed to the mounting plate via a terminal connector. This design optimizes the mating method between the circuit board assembly and the mounting plate, achieving insertion and fixation through a terminal connector. Specifically, a fisheye connector design is preferred, as this design offers simple insertion, secure fixation, and minimal requirements for the installation location.

[0012] As a preferred embodiment, a positioning block structure is provided between the front end cover and the circuit board assembly. The two end faces of the positioning block structure abut against the inner side of the front end cover and the circuit board assembly, respectively, to position the circuit board assembly axially within the pump housing cavity. This design optimizes the positioning between the pump housing end cover and the circuit board assembly, preventing the circuit board assembly from loosening towards the front end cover. The positioning block structure, with its two ends abutting against the inner end face of the front end cover and the circuit board assembly, further prevents axial movement of the circuit board assembly and the mounting plate.

[0013] As a preferred embodiment, the pump casing has a circular recessed groove structure at the edge corresponding to the rear end cover. The side edge of the rear end cover is rotatably fitted with the side wall of the circular recessed groove structure. The rear end cover has a central through hole, and the end of the rotor shaft is interference-fitted with the central through hole. This design optimizes the fit between the rotor and the pump casing, as well as between the end cover and the pump casing. The interference fit between the end of the rotor shaft and the rear end cover is preferably achieved through heat-fitting, while the side edge of the rear end cover is rotatably fitted into the circular recessed groove structure at the end of the pump casing.

[0014] As a preferred embodiment, the rotor assembly includes an inner rotor and an outer rotor respectively fitted onto the outer peripheral wall of the rotor shaft at different axial positions. An annular support platform protruding towards the center of the cavity is provided in the middle of the inner peripheral wall of the pump casing. The inner peripheral wall of the annular support platform rotatably supports the rotor shaft, and the inner and outer rotors are located on opposite sides of the annular support platform. This design optimizes the structure within the pump casing by providing an additional radial support force in the middle of the rotor shaft through the annular support platform, effectively supporting the rotor and improving the concentricity of the rotor shaft after prolonged operation.

[0015] As a preferred embodiment, the annular support platform is provided with oil passages connecting its two end faces, through which the inner rotor and the outer rotor's respective cavity spaces are connected. This annular support platform structure optimizes oil circuit connectivity, allowing oil passages to connect the pump's internal spaces on both sides of the annular support platform, ensuring the pump's working cycle.

[0016] As a preferred embodiment, the front cover is provided with a mounting through hole, and the front cover is fixedly mounted to the end face of the pump housing via a threaded connector. This design provides a preferred connection method between the front cover and the pump housing. Attached Figure Description

[0017] Figure 1 A schematic diagram of the external overall structure of an electronic oil pump device provided by this utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the electronic oil pump unit at position AA;

[0019] Figure 3 for Figure 1 A partial cross-sectional view of the housing and circuit board of the electronic oil pump device at position AA;

[0020] Figure 4 for Figure 1 A schematic diagram of the disassembled structure of the electronic oil pump unit.

[0021] in, Figures 1-4 middle:

[0022] 1. Pump casing; 2. Outer stator; 3. Outer rotor; 4. Inner stator; 5. Inner rotor; 6. Rear end cover; 7. Front end cover; 8. Circuit board assembly; 9. Mounting plate; 10. Rotor shaft; 11. Cooling oil passage; 12. Positioning block structure; 13. Stepped surface structure; 14. Circular recessed groove structure; 15. Annular support platform; 16. Oil passage hole. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Before providing a detailed explanation of the working principle of this utility model, further clarification is needed regarding its description: In this description, terms such as "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welded connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] refer to Figures 1-4 The following examples illustrate this. Figure 1 A schematic diagram of the external overall structure of an electronic oil pump device provided by this utility model; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the electronic oil pump unit at position AA; Figure 3 for Figure 1 A partial cross-sectional view of the housing and circuit board of the electronic oil pump device at position AA; Figure 4 for Figure 1 A schematic diagram of the disassembled structure of the electronic oil pump unit.

[0027] An embodiment of this utility model provides an electronic oil pump device, including a pump housing 1 and a rotor assembly and a stator assembly located in the cavity of the pump housing 1. A circuit board assembly 8 is provided at one end of the pump housing 1, and a front end cover 7 and a rear end cover 6 are respectively installed at both ends of the pump housing 1. A mounting plate 9 perpendicular to the central axis of the rotor assembly is provided in the cavity of the pump housing 1. The circuit board assembly 8 is mounted and fixed on the mounting plate 9. The mounting plate 9 is provided with an oil passage through hole structure connecting the spaces on both sides of the mounting plate 9. The rotor assembly includes a rotor shaft 10 located at the center. A cooling oil passage 11 is provided inside the rotor shaft 10, which passes through both ends of its axial direction. One end of the rotor shaft 10 abuts against the mounting plate 9, and the other end of the rotor shaft 10 abuts against the rear end cover 6. An end cover oil hole connected to the external oil passage is provided at the center of the rear end cover 6. The opening of the cooling oil passage 11 on the end face of the rotor shaft 10 is connected to the oil passage through hole structure of the mounting plate 9 and the end cover oil hole of the rear end cover 6.

[0028] The technical solution provided by this utility model improves the overall layout of a general oil pump design. The circuit board assembly 8 and the pump's rotor and stator are no longer sealed and partitioned, allowing the circuit board assembly 8 to be placed in the pump's oil environment. Specifically, a vertically oriented mounting plate 9 is provided inside the pump housing 1. The mounting plate 9 is used to fix the circuit board assembly 8 inside the pump housing 1, but it does not have a sealing and isolation function. An oil passage structure is provided on the mounting plate 9 to connect the space where the circuit board is located with the space where the rotor and stator are located. Furthermore, a through cooling oil passage 11 is provided inside the rotor shaft 10. The two ends of this cooling oil passage 11 connect the circuit board space with the external cooling oil passage 11, specifically through the end cap oil holes of the rear cover 6. This design allows for… This design ensures complete oil circulation within the space containing the circuit board, guaranteeing a stable supply of cooling oil to continuously cool the board during pump operation. This fully meets the board's operating environment requirements and eliminates the need for thermal paste or additional waterproof and ventilated structures for rust prevention. This significantly simplifies the additional structures required for circuit board placement. Furthermore, the elimination of the need for dedicated internal sealing of the circuit board space reduces the need for additional sealing structures such as sealing rings to isolate the pump's internal space. The corresponding non-internal partition design also greatly reduces the overall axial length of the pump body, lowering the installation standards for the oil pump. In summary, this design effectively solves the technical problems of existing electronic oil pump designs, such as large space occupation and complex structure.

[0029] In the technical solution provided in this embodiment, a stepped surface structure 13 is provided on the inner peripheral wall of the pump housing 1 at the position corresponding to the mounting plate 9, and the side edge of the mounting plate 9 abuts against the stepped surface structure 13. This design optimizes the fixation of the circuit board assembly 8 in the pump housing 1. It is achieved by optimizing the fixing method between the mounting plate 9 and the pump housing 1. The stepped surface structure 13 is provided at the corresponding axial position in the pump housing 1. This structure provides a fixed position between the mounting plate 9 and the pump housing 1, ensuring that the axial position of the mounting plate 9 is fixed.

[0030] In the technical solution provided in this embodiment, the circuit board assembly 8 is installed and fixed to the mounting plate 9 by plugging in terminal connectors. This design optimizes the cooperation between the circuit board assembly 8 and the mounting plate 9, and completes the plugging and fixing through terminal connectors. Specifically, a fisheye connector design is preferred, which is simple to plug in, firmly fixed, and has low requirements for the installation position.

[0031] In the technical solution provided in this embodiment, a positioning block structure 12 is provided between the front end cover 7 and the circuit board assembly 8. The two end faces of the positioning block structure 12 abut against the inner side of the front end cover 7 and the circuit board assembly 8, respectively, to position the circuit board assembly 8 in the axial position of the pump housing 1 cavity. This design optimizes the positioning between the end cover of the pump housing 1 and the circuit board assembly 8, preventing the circuit board assembly 8 from loosening towards the front end cover 7. The positioning block structure 12, with its two ends abutting against the inner end face of the front end cover 7 and the circuit board assembly 8, is provided between them to prevent axial movement of the circuit board assembly 8 and the mounting plate 9.

[0032] In the technical solution provided in this embodiment, the pump casing 1 has a circular recessed groove structure 14 at the edge of the corresponding rear end cover 6. The side edge of the rear end cover 6 is rotatably fitted with the side wall of the circular recessed groove structure 14. The rear end cover 6 has a central through hole, and the end of the rotor shaft 10 is interference-fitted with the central through hole. This design optimizes the fit between the rotor and the pump casing 1, as well as between the end cover and the pump casing 1. The end of the rotor shaft 10 is interference-fitted with the rear end cover 6, and the preferred assembly and fixing method is heat-fitting. The side edge of the rear end cover 6 is inserted into the circular recessed groove structure 14 at the end of the pump casing 1, which is rotatably fitted.

[0033] In the technical solution provided in this embodiment, the rotor assembly includes an inner rotor 5 and an outer rotor 3, which are respectively sleeved on the outer peripheral wall of the rotor shaft 10 at different axial positions. An annular support platform 15 protruding towards the center of the cavity is provided in the middle of the inner peripheral wall of the pump casing 1. The inner peripheral wall of the annular support platform 15 is rotatably supported by the rotor shaft 10. The inner rotor 5 and the outer rotor 3 are located on opposite sides of the annular support platform 15. It should be noted that, to accommodate this design where the rotor assembly is axially divided into two parts, the stator assembly is also correspondingly divided into an inner stator 4 and an outer stator 2. This design optimizes the structure within the pump casing 1. By providing an additional radial support force in the middle of the rotor shaft 10 through the annular support platform 15, the rotor is effectively supported, improving the concentricity of the rotor shaft 10 after long-term operation.

[0034] In the technical solution provided in this embodiment, the annular support platform 15 is provided with oil passage holes 16 connecting its two end faces, which connect the cavity spaces of the inner rotor 5 and the outer rotor 3 respectively. This design optimizes the oil circuit connectivity of the annular support platform structure, allowing the pump internal spaces on both sides of the annular support platform to be connected by oil passages, ensuring the working cycle of the oil pump.

[0035] In the technical solution provided in this embodiment, the front cover 7 is provided with a mounting through hole, and the front cover 7 is installed and fixed to the end face of the pump housing 1 by a threaded connector. This design provides a preferred connection method between the front cover 7 and the pump housing 1.

[0036] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. An electronic oil pump device, comprising a pump housing (1) and a rotor assembly and a stator assembly located within the cavity of the pump housing (1), wherein a circuit board assembly (8) is disposed at one end inside the pump housing (1), and a front end cover (7) and a rear end cover (6) are respectively installed at both ends of the pump housing (1), characterized in that, The pump housing (1) has a mounting plate (9) perpendicular to the central axis of the rotor assembly. The circuit board assembly (8) is mounted and fixed on the mounting plate (9). The mounting plate (9) has an oil passage through hole structure that connects the spaces on both sides of the mounting plate (9). The rotor assembly includes a rotor shaft (10) located at the center. The rotor shaft (10) has a cooling oil passage (11) that passes through both ends of its axial direction. One end of the rotor shaft (10) abuts against the mounting plate (9), and the other end of the rotor shaft (10) abuts against the rear end cover (6). The rear end cover (6) has an end cover oil hole that connects to the external oil passage at its center. The opening of the cooling oil passage (11) on the end face of the rotor shaft (10) connects the oil passage through hole structure of the mounting plate (9) and the end cover oil hole of the rear end cover (6).

2. The electronic oil pump device according to claim 1, characterized in that, The inner peripheral wall of the pump casing (1) is provided with a stepped surface structure (13) corresponding to the position of the mounting plate (9), and the side edge of the mounting plate (9) abuts against the stepped surface structure (13).

3. The electronic oil pump device according to claim 2, characterized in that, The circuit board assembly (8) is installed and fixed to the mounting plate (9) by means of a terminal connector.

4. The electronic oil pump device according to claim 3, characterized in that, A positioning block structure (12) is provided between the front cover (7) and the circuit board assembly (8). The two ends of the positioning block structure (12) abut against the inner side of the front cover (7) and the circuit board assembly (8) respectively, so as to position the circuit board assembly (8) in the axial position of the pump housing (1) cavity.

5. The electronic oil pump device according to any one of claims 1-4, characterized in that, The pump casing (1) is provided with a circular recessed groove structure (14) at the edge position corresponding to the rear end cover (6). The side edge of the rear end cover (6) is rotatably engaged with the side wall of the circular recessed groove structure (14). The rear end cover (6) is provided with a central through hole. The end of the rotor shaft (10) is interference-fitted with the central through hole.

6. The electronic oil pump device according to claim 5, characterized in that, The rotor assembly includes an inner rotor (5) and an outer rotor (3) respectively fitted on the outer peripheral wall of the rotor shaft (10) at different axial positions. The pump housing (1) has an annular support platform (15) protruding towards the center of the cavity in the middle of the inner peripheral wall. The inner peripheral wall of the annular support platform (15) is rotatably supported by the rotor shaft (10). The inner rotor (5) and the outer rotor (3) are located on both sides of the annular support platform (15).

7. The electronic oil pump device according to claim 6, characterized in that, The annular support platform (15) is provided with oil passage holes (16) connecting its two end faces, and the inner rotor (5) and the outer rotor (3) are connected to their respective cavity spaces through the oil passage holes (16).

8. The electronic oil pump device according to claim 5, characterized in that, The front cover (7) is provided with an installation through hole, and the front cover (7) is installed and fixed to the end face of the pump housing (1) by a threaded connector.

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