An electrically controlled oil pump structure

Abstract

This utility model discloses an electrically controlled oil pump structure, including a motor housing, a motor shaft, an outer rotor, an inner rotor, an oil pump cover, and an elastic component. One end of the motor housing is connected to the oil pump cover, forming an oil pump rotor cavity, within which the outer rotor and inner rotor are assembled. The oil pump cover has a central hole at its end face facing the oil pump rotor cavity, and the elastic component is housed within this hole. One end of the motor shaft passes through the oil pump rotor cavity and extends into the central hole of the oil pump cover, abutting against the elastic component. The elastic component includes a sphere, an elastic element, and a base. The base is a cylindrical structure with an elastic element inside its inner hole. Both ends of the elastic element contact the oil pump cover and the sphere, respectively. In the assembled state, the motor shaft abuts against the sphere. This utility model is used in electrically controlled oil pumps where the motor shaft and oil pump rotor are fixedly connected, and the motor shaft is supported by a sliding bearing. The elastic component buffers the axial impact of the motor, thereby improving NVH performance.

Description

Technical Field

[0001] This utility model relates to the field of electronically controlled oil pump technology, specifically an electronically controlled oil pump structure. Background Technology

[0002] The automotive electronic oil pump industry is an emerging field closely related to the electrification and intelligentization of automobiles, with broad development prospects. As an indispensable core component in new energy vehicles and hybrid vehicles, electronic oil pumps are mainly used in the thermal management and cooling / lubrication systems of electric drive systems.

[0003] Electrically controlled oil pumps with a fixed connection between the motor shaft and the oil pump rotor, and a sliding bearing-supported structure for the motor shaft, have become a commonly used design structure due to their advantages such as fewer parts and better economy. However, because the motor shaft is fixedly connected to the oil pump rotor, it is difficult to axially limit the motor shaft due to assembly process and dimensional interference issues. During operation, the axial electromagnetic force between the motor stator and rotor, as well as the oil pressure fluctuations at the pump, cause the oil pump rotor to experience axial movement at a certain frequency and collide with the housing, increasing the NVH (noise, vibration, and harshness) of the electrically controlled oil pump. Summary of the Invention

[0004] The purpose of this invention is to provide an electronically controlled oil pump structure, including a motor housing, a motor shaft, an outer rotor, an inner rotor, an oil pump cover, and an elastic component.

[0005] One end of the motor housing is connected to the oil pump cover, forming an oil pump rotor cavity. The oil pump rotor cavity is equipped with an internally meshing outer rotor and an inner rotor.

[0006] The oil pump cover has a central hole at the center of its end face facing the oil pump rotor cavity, and an elastic component is provided inside the central hole of the oil pump cover.

[0007] One end of the motor shaft passes through the oil pump rotor cavity and extends into the center hole of the oil pump cover, where it abuts against the elastic component.

[0008] The elastic component includes a sphere, an elastic element, and a base.

[0009] The base is a hollow cylindrical structure with open ends. An elastic element is provided in the inner hole of the base. One end of the elastic element is in contact with the oil pump cover, and the other end is in contact with a ball.

[0010] In the assembled state, the motor shaft abuts against the sphere.

[0011] Furthermore, the oil pump cover has a gap with the inner rotor and the outer rotor along the axial direction of the motor shaft.

[0012] Furthermore, the diameter of the sphere is 2mm to 8mm.

[0013] Furthermore, the sphere is in contact with the center of the end face of the motor shaft.

[0014] Furthermore, the outer rotor and the oil pump rotor cavity are in a clearance fit.

[0015] Furthermore, the inner rotor and the motor shaft are interference-fitted.

[0016] Furthermore, the oil pump cover and the motor housing are interference-fitted.

[0017] The technical effects of this utility model are undeniable, and its beneficial effects are as follows:

[0018] This utility model is used for an electrically controlled oil pump in which the motor shaft and the oil pump rotor are fixedly connected and the motor shaft is supported by a sliding bearing. By using an elastic component to buffer the axial impact of the motor, it effectively improves NVH performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an electronically controlled oil pump.

[0020] Figure 2 This is a schematic diagram of the motor housing;

[0021] Figure 3 This is a schematic diagram of the external rotor;

[0022] Figure 4 This is a schematic diagram of the internal rotor;

[0023] Figure 5 Schematic diagram of oil pump cover

[0024] Figure 6 This is a schematic diagram of a flexible component;

[0025] In the figure: drive motor 1, motor housing 11, oil pump rotor cavity 111, motor shaft 12, outer rotor 2, inner rotor 3, oil pump cover 4, oil pump cover center hole 41, elastic component 5, sphere 51, elastic element 52, base 53. Detailed Implementation

[0026] The present invention will be further described below with reference to embodiments, but it should not be construed as the scope of the present invention being limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and conventional methods in the art without departing from the above-described technical concept of the present invention should be included within the protection scope of the present invention.

[0027] Example 1:

[0028] An electronically controlled oil pump structure includes a motor housing 11, a motor shaft 12, an outer rotor 2, an inner rotor 3, an oil pump cover 4, and an elastic component 5.

[0029] One end of the motor housing 11 is connected to the oil pump cover 4, forming an oil pump rotor cavity 111. The oil pump rotor cavity 111 is equipped with an internally meshing outer rotor 2 and an inner rotor 3.

[0030] The oil pump cover 4 has a central hole 41 at the center of the end face facing the oil pump rotor cavity 111, and an elastic component 5 is provided inside the central hole 41.

[0031] One end of the motor shaft 12 passes through the oil pump rotor cavity 111 and extends into the center hole 41 of the oil pump cover, where it abuts against the elastic component 5.

[0032] The elastic component 5 includes a sphere 51, an elastic element 52, and a base 53.

[0033] The base 53 is a cylindrical structure with a hollow interior and open ends. An elastic element 52 is provided in the inner hole of the base 53. One end of the elastic element 52 is in contact with the oil pump cover 4, and the other end is in contact with the ball 51.

[0034] In the assembled state, the motor shaft 12 abuts against the sphere 51.

[0035] Example 2:

[0036] The main structure of this embodiment is the same as that of embodiment 1. Furthermore, the oil pump cover 4 and the inner rotor 3 and outer rotor 2 have a gap along the axial direction of the motor shaft 12.

[0037] Example 3:

[0038] The main structure of this embodiment is the same as any one of embodiments 1 to 2. Furthermore, the diameter of the sphere 51 is 2mm to 8mm.

[0039] Example 4:

[0040] The main structure of this embodiment is the same as any one of embodiments 1 to 3. Furthermore, the sphere 51 is in contact with the center of the end face of the motor shaft 12.

[0041] Example 5:

[0042] The main structure of this embodiment is the same as any one of embodiments 1 to 4. Furthermore, the outer rotor 2 and the oil pump rotor cavity 111 are in clearance fit.

[0043] Example 6:

[0044] The main structure of this embodiment is the same as any one of embodiments 1 to 5. Furthermore, the inner rotor 3 and the motor shaft 12 are interference fit.

[0045] Example 7:

[0046] The main structure of this embodiment is the same as any one of embodiments 1 to 6. Furthermore, the oil pump cover 4 and the motor housing 11 are interference-fitted.

[0047] Example 8:

[0048] The main structure of this embodiment is the same as any one of embodiments 1 to 7. Furthermore, the elastic element 52 is a spring.

[0049] Example 9:

[0050] The main structure of this embodiment is the same as any one of embodiments 1 to 8. Furthermore, an electronically controlled oil pump includes a drive motor, a motor housing, a motor shaft, an inner rotor, an outer rotor, an oil pump cover, and an elastic component.

[0051] The drive motor housing contains an oil pump rotor cavity. The outer rotor is mounted in the oil pump rotor cavity with a clearance fit. The inner rotor is connected to the motor shaft with an interference fit and meshes with the outer rotor. The motor shaft passes through a central hole in the motor housing and can rotate within the central hole. The oil pump cover is interference-fitted to the motor housing and fits against the axial end faces of the inner and outer rotors. A certain axial clearance exists between the oil pump cover and the inner and outer rotors.

[0052] An elastic component is fixedly installed inside the central hole of the oil pump cover. The top of the elastic component is a sphere with a diameter of φ2mm to φ8mm. The sphere contacts the central end face of the motor shaft and provides an axial support force of 10N to 50N. When the electronically controlled oil pump is working, the elastic component is used to support and buffer the axial impact on the motor shaft.

[0053] This utility model is used for an electrically controlled oil pump in which the motor shaft and the oil pump rotor are fixedly connected and the motor shaft is supported by a sliding bearing. The elastic component buffers the axial impact of the motor, thereby improving NVH performance.

Claims

1. An electronically controlled oil pump structure, characterized in that: It includes a motor housing (11), a motor shaft (12), an outer rotor (2), an inner rotor (3), an oil pump cover (4), and an elastic component (5); One end of the motor housing (11) is connected to the oil pump cover (4), forming an oil pump rotor cavity (111); the oil pump rotor cavity (111) is equipped with an inner rotor (2) and an inner rotor (3) that mesh internally. The oil pump cover (4) has a central hole (41) at the center of the end face facing the oil pump rotor cavity (111), and an elastic component (5) is provided inside the central hole (41). One end of the motor shaft (12) passes through the oil pump rotor cavity (111) and extends into the center hole (41) of the oil pump cover, where it abuts against the elastic component (5); The elastic component (5) includes a sphere (51), an elastic element (52), and a base (53); The base (53) is a cylindrical structure with a hollow interior and open ends. An elastic element (52) is provided in the inner hole of the base (53). One end of the elastic element (52) is in contact with the oil pump cover (4), and the other end is in contact with the ball (51). In the assembled state, the motor shaft (12) abuts against the sphere (51).

2. The electronically controlled oil pump structure according to claim 1, characterized in that: The oil pump cover (4) has a gap with the inner rotor (3) and the outer rotor (2) along the axial direction of the motor shaft (12).

3. The electronically controlled oil pump structure according to claim 1, characterized in that: The diameter of the sphere (51) is 2mm to 8mm.

4. The electronically controlled oil pump structure according to claim 1, characterized in that: The sphere (51) is in contact with the center of the end face of the motor shaft (12).

5. The electronically controlled oil pump structure according to claim 1, characterized in that: The outer rotor (2) and the oil pump rotor cavity (111) are in clearance fit.

6. The electronically controlled oil pump structure according to claim 1, characterized in that: The inner rotor (3) and the motor shaft (12) are interference fit.

7. The electronically controlled oil pump structure according to claim 1, characterized in that: The oil pump cover (4) and the motor housing (11) are interference-fitted.

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