Electronic oil pump outer rotor suspension device and electronic oil pump

Abstract

An electronic oil pump external rotor suspension device includes an external rotor rotation support assembly, which comprises an external rotor and the rotation support assembly; the external rotor and the rotation support assembly are an integral structure or a separate structure; the external rotor is embedded and fixed on the inner surface of the rotation support assembly; the outer surface of the rotation support assembly is disposed inside the oil pump; the electronic oil pump includes a pump cover, a drive shaft, a pump body, a motor, a control unit, and a bottom cover; it is provided with a double-end face oil inlet and double-end face oil outlet structure; the connection between the pump cover drive shaft and the inner rotor is a press-fit drive, a flat drive, or a spline drive.

Description

Technical Field

[0001] This invention belongs to the field of oil pump technology for suspension systems of hybrid vehicles and gasoline vehicles, specifically relating to an electronic oil pump external rotor suspension device and an electronic oil pump. Background Technology

[0002] The suspension systems of pure electric, hybrid, and gasoline vehicles, as well as fully active suspension systems, require the use of oil pumps, which include hydraulic structures such as electronic oil pumps and mechanical oil pumps.

[0003] Introduction to the oil suction principle of electronic oil pump:

[0004] The electronic oil pump receives an action command from the host computer, initializes, enters the control state, and drives the internal rotor of the oil pump to rotate via the motor's drive shaft. For example... Figure 8 As shown, when the inner rotor of the oil pump rotates clockwise around center O1, it drives the outer rotor to rotate in the same direction around rotor center O2. At this time, a sealed cavity is formed by the top of the inner rotor teeth and the outer rotor teeth. As the rotor rotates, the sealed volume of the oil suction cavity formed between the two meshing points of the inner and outer rotor teeth gradually expands, creating a vacuum. Under atmospheric pressure, the oil pump draws in oil. At the same time, the sealed volume of the oil discharge cavity formed between the two meshing points of the inner and outer rotor teeth gradually shrinks, discharging the pressurized oil from the oil cavity. When the teeth of the inner and outer rotors form the maximum space between the two meshing points (…),… Figure 8 Once the oil suction is complete (at the lower sealing point), oil discharge begins.

[0005] As the rotor continues to rotate, the sealed volume of the oil discharge chamber formed by the two meshing points of the inner and outer rotor teeth gradually decreases, and the oil is compressed. Therefore, the oil is discharged through another oil distribution window, i.e., the oil discharge passage, until one tooth of the inner rotor meshes with two teeth of the outer rotor. Figure 8 When the oil is sealed at the top, the oil discharge is complete; each time the inner rotor rotates once, it forms 5 oil suction and discharge cycles with the outer rotor. When the inner rotor rotates continuously, the oil suction and discharge process of the gear pump is completed.

[0006] The intelligent suspension system uses a hydraulic pump for rapid response adjustment of the reducer's damping. This structure can effectively make the pump work at high speeds, up to 20,000 rpm (compared to 2,000-5,000 rpm for conventional hydraulic pumps), and at low speeds, it is prone to overheating and wear. At low speeds, it is prone to leakage and has low volumetric efficiency.

[0007] The volumetric efficiency of a pump is equal to the actual flow rate of the pump divided by the theoretical flow rate of the pump; while the volumetric efficiency of a pump represents the pump's ability to resist leakage, which is typically 40-50% for current technologies.

[0008] Under current conditions, the high-pressure electronic oil pump is expected to have a power output of 4000W-5000W at a speed of 5000rpm and a pressure of 90bar.

[0009] Chinese patent CN2023211688429 provides a dynamic sealing device for an oil pump, wherein sealing strips are provided on the upper and lower end faces of the outer rotor and the inner rotor, and the sealing strips are embedded in grooves provided at corresponding positions on the pump cover and / or pump body; a sealing ring is provided between the inner rotor and the pump body.

[0010] Application publication number CN116557288A discloses a sensorless electronic oil pump, including a hydraulic module, a motor module, and a PCBA module. The PCBA module includes a PCBA cover and a control board. The motor module includes an integrated injection-molded motor rotor and an embedded motor stator. The PCBA cover is fastened to the pump body and sealed. The control board is in contact with the oil in the pump body. The embedded motor stator and the pump body are integrally injection molded.

[0011] They all adopt separate outer rotor and inner rotor, and achieve sealing through sealing ring and groove on end face; axial friction with pump body; end face friction with pump body and pump cover;

[0012] Due to the impact of the new energy industry, intelligent driving, and autonomous driving on the comfort and functionality of the vehicle, the suspension system of the vehicle urgently needs improvement to overcome the above-mentioned defects, improve the volumetric efficiency of the pump, and meet the requirements of high speed and low torque operating conditions. Summary of the Invention

[0013] The purpose of this invention is to provide an external rotor suspension device for an electronic oil pump, including an external rotor rotation support assembly. The external rotor rotation support assembly includes an external rotor and a rotation support assembly. The external rotor and the rotation support assembly are an integral structure or a separate structure. The external rotor is embedded and fixed on the inner surface of the rotation support assembly. The outer surface of the rotation support assembly is disposed inside the oil pump.

[0014] The technical solution provided in this application also has the following technical features:

[0015] Preferably, in one embodiment of this application, the rotating support assembly includes a rotating part and a rolling part, the rotating part including an inner rotating member and an outer rotating member; the rolling part including a rolling element.

[0016] Preferably, in one embodiment of this application, the rolling element is a ball bearing, and a retainer is provided.

[0017] Preferably, in one embodiment of this application, the rotating support assembly is used to adjust the distance clearance between the outer rotor and the pump body.

[0018] Preferably, in one embodiment of this application, the rotating support assembly is used to adjust the distance clearance between the outer rotor and the pump cover.

[0019] Preferably, in one embodiment of this application, the rotating support assembly is used to adjust the distance clearance between the outer rotor and the pump body and pump cover.

[0020] Preferably, in one embodiment of this application, the outer rotor and the pump cover do not contact each other.

[0021] Preferably, in one embodiment of this application, the outer rotor and the pump body do not contact each other.

[0022] Preferably, in one embodiment of this application, no seal or / and sealing strip is provided between the outer rotor and the pump cover; no seal or / and sealing strip is provided between the outer rotor and the pump body.

[0023] Preferably, in one embodiment of this application, the outer rotor is provided with an inner rotor, and no seal or / and sealing strip is provided between the inner rotor and the pump cover; no seal or / and sealing strip is provided between the inner rotor and the pump body.

[0024] Preferably, in one embodiment of this application, the oil film gap between the outer rotor and the pump cover is 0.02-0.05 mm.

[0025] Preferably, in one embodiment of this application, the oil film gap between the outer rotor and the pump body is 0.02-0.05 mm.

[0026] By applying the above-mentioned external rotor suspension device for an electronic oil pump, an electronic oil pump is obtained, including a pump cover, a drive shaft, a pump body, a motor, a control unit, and a bottom cover; it is equipped with a double-end face oil inlet and double-end face oil outlet structure; the pump cover drive shaft and the inner rotor are driven by press fitting, flat position, or spline.

[0027] Preferably, in one embodiment of this application, the outer rotor rotation support assembly is assembled in the pump body using a press-fit or heat-fitting process to precisely control the height distance of the outer rotor in the hydraulic cavity of the pump body, so that it is suspended in the hydraulic cavity, with an installation gap of 0-0.05mm.

[0028] Preferably, in one embodiment of this application, the installation gap is 0.02 mm.

[0029] The beneficial effects of this application are as follows:

[0030] 1. This application provides an electronic oil pump that can drive the hydraulic end with extremely low mechanical loss, high mechanical efficiency, or even less torque. The hydraulic end clearance of the pump can also be controlled to a minimum, thereby improving volumetric efficiency. This satisfies the requirements of high speed and high mechanical efficiency, with an estimated mechanical efficiency of up to 90%, better adapting to the working conditions of suspension oil pumps, including high pressure, high volumetric efficiency, high speed, and rapid response.

[0031] 2. The overall pump power of this application is 2500W with near-zero friction on the external rotor, a reduction of about 2000W (the power reduction leads to a reduction in motor size and weight of up to 2000g, and energy consumption is reduced by about 40% proportionally); the start-up response of conventional high-pressure pumps is 100ms-200ms from 0-7000rpm; 0-7000rpm can be completed in 20ms; it has excellent technical characteristics of low energy consumption, high efficiency, and high speed. Attached Figure Description

[0032] Figure 1 This is a cross-sectional view of an electronic oil pump according to the present invention;

[0033] Figure 2 This is an exploded view of an electronic oil pump according to the present invention;

[0034] Figure 3 This is a front view of an electronic oil pump according to the present invention;

[0035] Figure 4 This is a top view of an electronic oil pump according to the present invention;

[0036] Figure 5 This is a left view of an electronic oil pump according to the present invention;

[0037] Figure 6 This is a cross-sectional structural schematic diagram of an electronic oil pump according to the present invention;

[0038] Figure 7 This is a schematic diagram of the oil inlet and outlet of an electronic oil pump according to the present invention;

[0039] Figure 8 This is a schematic diagram of the oil suction principle of an existing electronic oil pump;

[0040] In the picture:

[0041] 1. Pump cover

[0042] 2. Drive shaft

[0043] 3. Internal rotor

[0044] 4. External rotor rotation support assembly

[0045] 41. External rotor

[0046] 42. Rotating support assembly

[0047] 5. Pump body

[0048] 6. Motor

[0049] 7. Control Unit

[0050] 8. Bottom cover. Detailed Implementation

[0051] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. These embodiments are only for illustrating this application and are not intended to limit the invention.

[0052] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical 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 invention according to the specific circumstances.

[0054] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0055] like Figure 1-7 An external rotor suspension device for an electronic oil pump includes an external rotor rotation support assembly 4, which comprises an external rotor 41 and a rotation support assembly 42. The external rotor 41 and the rotation support assembly 42 are either an integral structure or separate structures. The external rotor 41 is embedded and fixed on the inner surface of the rotation support assembly 42. The outer surface of the rotation support assembly 42 is disposed inside the oil pump. By using the external rotor rotation support assembly 4, friction is reduced, and a controllable gap setting is achieved, thereby reducing frictional force and achieving the expected process conditions, thus maintaining good operating conditions.

[0056] Specifically, in one embodiment of this application, the rotating support assembly 42 includes a rotating part and a rolling part. The rotating part includes an inner rotating component and an outer rotating component; the rolling part includes a rolling element; in this embodiment, a ball bearing can be used.

[0057] Specifically, in one embodiment of this application, the rolling element is a ball, and a cage is provided; this embodiment may use a ball bearing.

[0058] Specifically, in one embodiment of this application, the rotating support assembly 42 is used to adjust the distance clearance between the outer rotor 41 and the pump body 5.

[0059] Specifically, in one embodiment of this application, the rotating support assembly 42 is used to adjust the distance gap between the outer rotor 41 and the pump cover 1.

[0060] Specifically, in one embodiment of this application, the rotating support assembly 42 is used to adjust the distance clearance between the outer rotor 41 and the pump body 5 and the pump cover 1.

[0061] Specifically, in one embodiment of this application, the outer rotor 41 and the pump cover 1 do not contact each other, and an oil film is provided in the gap to reduce friction and achieve the expected process conditions, so as to maintain good working conditions.

[0062] Specifically, in one embodiment of this application, the outer rotor 41 and the pump body 5 do not contact each other, and an oil film is provided in the gap to reduce friction and achieve the expected process conditions, so as to maintain good working conditions.

[0063] Specifically, in one embodiment of this application, no seal or / and sealing strip is provided between the outer rotor 41 and the pump cover 1; no seal or / and sealing strip is provided between the outer rotor 41 and the pump body 5. The structure that supports the outer rotor and reduces friction is eliminated, thus reducing cost and structural complexity.

[0064] Specifically, in one embodiment of this application, the outer rotor 41 is equipped with an inner rotor 3, and no seal or / and sealing strip is provided between the inner rotor 3 and the pump cover 1; no seal or / and sealing strip is provided between the inner rotor 3 and the pump body 5. The structure that supports the outer rotor and reduces friction is eliminated, thus reducing cost and structural complexity.

[0065] Specifically, in one embodiment of this application, the oil film gap between the outer rotor 41 and the pump cover 1 is 0.02-0.05 mm, which meets the technical requirements for high-speed operation.

[0066] Specifically, in one embodiment of this application, the oil film gap between the outer rotor 41 and the pump body 5 is 0.02-0.05 mm.

[0067] Specifically, in one embodiment of this application, an electronic oil pump includes a pump cover 1, a drive shaft 2, a pump body 5, a motor 6, a control unit 7, and a bottom cover 8; it is provided with a double-end face oil inlet and double-end face oil outlet structure; the pump cover 1, drive shaft 2, and inner rotor 3 are connected by a press-fit drive, a flat position drive, or a spline drive.

[0068] Specifically, in one embodiment of this application, the outer rotor rotation support assembly 4 is assembled in the pump body using a press-fit or heat-fitting process to precisely control the height distance of the outer rotor in the hydraulic cavity of the pump body, so that it is suspended in the hydraulic cavity. The installation gap is 0-0.05mm, and an oil film is set in the gap to reduce friction and achieve the expected process, so as to maintain good working conditions.

[0069] Specifically, in one embodiment of this application, the installation gap is 0.02 mm, which is the most ideal installation and operating condition.

[0070] The main body of this application is the outer rotor ball structure, and the outer rotor rotation support assembly adopts bearing components to form a ball bearing and outer rotor as one unit, which can be combined and separated - yellow and purple-red parts; the powder metallurgy material of the outer rotor ball part can be heat treated and surface hard anodized, or high carbon steel material can be used, with stable structural strength and pressure resistance up to 200 bar.

[0071] The outer rotor is integrated with a ball bearing structure and assembled in the pump body. It can be assembled by press fitting or heat fitting. The height distance of the outer rotor in the hydraulic cavity of the pump body can be precisely controlled, so that it is suspended in the hydraulic cavity. The minimum gap of about 0.02 is well controlled to ensure that there is an oil film gap on the upper and lower end faces, and the gap is not too large, which would lead to a decrease in volumetric efficiency.

[0072] Due to the requirements of suspension and other high-pressure environments, the pressure is around 200 bar and the speed requirement is 10,000-20,000 rpm. Therefore, even a small contact will lead to an increase in torque. This structure can avoid this problem. It provides mechanical efficiency and volumetric efficiency, reduces the power consumption of the motor, and at the same time improves the instantaneous response speed. It has low starting torque and fast response speed. The suspension oil pump has particularly high requirements for this, reaching 10,000 rpm in 200ms.

[0073] Simultaneously, the structure of double-end face oil inlet and double-end face oil outlet further reduces hydraulic friction work, improves efficiency, and reduces torque, such as in new energy vehicles, new energy suspension support, and aircraft lubrication.

[0074] This application controls the distance of the outer rotor by using bearings, ensuring that neither the upper nor lower end faces rub against the pump body or pump cover, thus guaranteeing an oil film gap of 0.02-0.05mm and significantly reducing friction.

[0075] The bearing-based connection eliminates the need for the entire outer rotor surface to contact the aluminum alloy pump body, thus reducing frictional torque and saving significant power consumption, especially under high speed and high pressure conditions.

[0076] The drive shaft portion of this application can be press-fitted to the inner rotor or driven by the inner rotor via a flat drive or a spline drive.

[0077] The control unit of this application can be implemented on 48V, 400V, or 800V platforms.

[0078] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An external rotor suspension device for an electronic oil pump, characterized in that: It includes an outer rotor rotation support assembly (4), which includes an outer rotor (41) and a rotation support assembly (42); the outer rotor (41) and the rotation support assembly (42) are an integral structure or a separate structure; the outer rotor (41) is embedded and fixed on the inner surface of the rotation support assembly (42); The outer surface of the rotating support assembly (42) is located inside the oil pump.

2. The electronic oil pump external rotor suspension device as described in claim 1, characterized in that, The rotating support assembly (42) includes a rotating part and a rolling part. The rotating part includes an inner rotating component and an outer rotating component. The rolling part includes a rolling element. The rolling element is a ball and is equipped with a retainer.

3. The electronic oil pump external rotor suspension device as described in claim 1, characterized in that, The rotating support assembly (42) is used to adjust the distance clearance between the outer rotor (41) and the pump body (5), and the rotating support assembly (42) is used to adjust the distance clearance between the outer rotor (41) and the pump cover (1).

4. The electronic oil pump external rotor suspension device as described in claim 1, characterized in that, The outer rotor (41) and the pump cover (1) do not contact each other; the outer rotor (41) and the pump body (5) do not contact each other.

5. The electronic oil pump external rotor suspension device as described in claim 1, characterized in that, No seals or / and sealing strips are provided between the outer rotor (41) and the pump cover (1); no seals or / and sealing strips are provided between the outer rotor (41) and the pump body (5).

6. The electronic oil pump external rotor suspension device as described in claim 1, characterized in that, The outer rotor (41) is equipped with an inner rotor (3), and no seal or / and sealing strip is provided between the inner rotor (3) and the pump cover (1); no seal or / and sealing strip is provided between the inner rotor (3) and the pump body (5).

7. The electronic oil pump external rotor suspension device as described in claim 1, characterized in that, The oil film gap between the outer rotor (41) and the pump cover (1) is 0.02-0.05mm; the oil film gap between the outer rotor (41) and the pump body (5) is 0.02-0.05mm.

8. An electronic oil pump, employing the external rotor suspension device for an electronic oil pump as described in any one of claims 1-7, characterized in that, It includes a pump cover (1), a drive shaft (2), a pump body (5), a motor (6), a control unit (7), and a bottom cover (8); it is equipped with a double-end oil inlet and double-end oil outlet structure; the pump cover (1), drive shaft (2), and inner rotor (3) are connected by a press-fit drive, a flat drive, or a spline drive.

9. An electronic oil pump as described in claim 8, characterized in that, The outer rotor rotation support assembly (4) is assembled in the pump body using a press-fit or heat-fit process, so that the outer rotor is suspended in the hydraulic cavity of the pump body with an installation gap of 0-0.05mm.

10. An electronic oil pump as described in claim 9, characterized in that, Installation gap 0.02mm.

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