Electronic oil pump applying hydrostatic bearing

Abstract

The utility model relates to an electronic oil pump applying a hydrostatic bearing, which comprises an oil pump shell, a rotor shell and a pump cover are sequentially mounted on one side of the oil pump shell, a controller shell, a controller cover and the oil pump shell are sequentially mounted on the other side of the oil pump shell, a rotor assembly is rotatably mounted in the rotor shell, and a stator assembly is arranged on the periphery of the rotor assembly. A rotor shaft is arranged in the middle of the rotor assembly, one side of the rotor shaft is sleeved with an inner rotor, an outer rotor is arranged on the periphery of the inner rotor, a high-pressure oil outlet cavity and a low-pressure oil return cavity are formed between the inner rotor and the outer rotor, the high-pressure oil outlet cavity and the low-pressure oil return cavity are communicated through an oil duct, and the oil duct flows through the rotating contact faces of the rotor shell, the oil pump shell and the rotor shaft. The utility model provides pressure lubrication while avoiding the risk of oil shortage for the rotation of the rotor, and is more reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic oil pumps and relates to an electronic oil pump using a liquid static pressure bearing. Background Art

[0002] With the continuous development of the automotive industry, many mechanical parts on automobiles are gradually being replaced by electric parts to achieve intelligence and energy saving. The mechanical oil pumps in automobile transmissions will be gradually replaced by electronic oil pumps.

[0003] The function of the electronic oil pump: together with the oil circuit, heat exchanger, filter and other structures of the electric drive system, it constitutes the cooling and lubrication system of the electric drive system; it receives signals from the upper system and provides lubricating oil with a certain flow rate and pressure; and it feeds back its own status to the upper system.

[0004] The electronic oil pump operates as follows: A controller energizes the permanent magnet motor, which drives the inner rotor. The inner and outer rotors are eccentric, forming several closed cavities between them. The inner rotor drives the outer rotor in the same direction, simultaneously rotating the closed cavities and changing their volume, thereby pumping oil. Furthermore, the rotor cavity is divided into a low-pressure oil inlet area and a high-pressure oil outlet area. Oil is drawn from the high-pressure outlet area into the motor cavity and returned from the low-pressure oil inlet area to the external oil circuit. This cools the permanent magnet motor and controller, ensuring that the electronic oil pump operates within a specific temperature range.

[0005] Existing problems: The bearings of electronic oil pumps are mostly sliding bearings, that is, liquid dynamic bearings, which require the motor to reach a certain speed to produce a good oil film, causing certain wear on the shaft hole and shaft; at the same time, due to factors such as the structure and oil pump installation, the bearings face the risk of oil shortage, causing dry grinding and jamming of the bearings. Summary of the Invention

[0006] The purpose of the utility model is to provide an electronic oil pump using a liquid hydrostatic bearing, which can solve the above-mentioned problems.

[0007] According to the technical solution provided by the utility model: an electronic oil pump using a liquid hydrostatic bearing includes an oil pump housing, a rotor housing and a pump cover are installed in sequence on one side of the oil pump housing, and a controller housing and a controller cover are installed in sequence on the other side. A rotor assembly is rotatably installed in the oil pump housing and the rotor housing, a stator assembly is provided on the outer periphery of the rotor assembly, a rotor shaft is in the middle of the rotor assembly, an inner rotor is sleeved on one side of the rotor shaft, an outer rotor is provided on the outer periphery of the inner rotor, a high-pressure oil outlet chamber and a low-pressure oil return chamber are formed between the inner rotor and the outer rotor, the high-pressure oil outlet chamber and the low-pressure oil return chamber are connected by an oil channel, and the oil channel flows through the rotating contact surface of the rotor housing, the oil pump housing and the rotor shaft.

[0008] As a further improvement of the present invention, a bearing bush is installed in the oil pump housing, a rotor hole is provided in the rotor housing, and both sides of the rotor shaft are in rotational contact with the bearing bush and the rotor hole respectively.

[0009] As a further improvement of the present invention, an oil inlet hole and an oil return hole are provided in the rotor housing, a first lubrication groove is provided on the inner wall of the rotor hole, an axial oil hole is provided axially in the rotor shaft, a first radial hole and a second radial hole connected to the axial oil hole are provided on both sides of the rotor shaft, a bearing lubrication groove is provided on the inner circumference of the bearing, and the high-pressure oil outlet cavity, the oil inlet hole, the first lubrication groove, the first radial hole, the axial oil hole, the second radial hole, the bearing lubrication groove, the lower part of the oil pump housing, the oil return hole, and the low-pressure oil return cavity are connected; the above-mentioned oil holes and oil grooves constitute an oil channel.

[0010] As a further improvement of the present invention, the oil inlet hole is obliquely located at the upper part of the rotor housing, and the oil return hole is horizontally arranged at the lower part of the rotor housing.

[0011] As a further improvement of the present invention, a controller is installed in the controller housing, and the controller is connected to the stator assembly via a line.

[0012] As a further improvement of the present invention, the stator assembly is fixedly installed in the oil pump housing, and the outer rotor is rotatably installed in the rotor housing.

[0013] As a further improvement of the present invention, the oil pump housing is a metal stamping part, which is injection-molded into one piece with the controller housing made of plastic.

[0014] As a further improvement of the present invention, the controller cover is a metal stamping part.

[0015] As a further improvement of the present invention, glue is used to seal the controller cover and the controller housing.

[0016] The positive progress of this application is:

[0017] The utility model avoids the risk of oil shortage for the rotation of the rotor and provides pressure lubrication at the same time, which is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Figure 1 It includes an inner rotor 1, an outer rotor 2, a stator assembly 3, a controller cover 5, a controller housing 6, an oil pump housing 7, a rotor shaft 10, an oil inlet hole 12, a first radial hole 13, a first lubrication groove 14, an axial oil hole 15, a second radial hole 16, a bearing lubrication groove 17, a rotor housing 18, a bearing 19, etc. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate for the embodiments of the present invention described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed may also be "included" and "having"; for example, a process, method, system, product or device that may include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0023] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text.

[0024] like Figure 1 As shown, the utility model is an electronic oil pump using a liquid hydrostatic bearing, comprising an oil pump housing 7, a rotor housing 18 and a pump cover 8 being mounted in sequence on one side of the oil pump housing 7, and a controller housing 6 and a controller cover 5 being mounted in sequence on the other side. A rotor assembly is rotatably mounted in the oil pump housing 7 and the rotor housing 18, a stator assembly 3 being provided on the outer periphery of the rotor assembly, a rotor shaft 10 being provided in the middle of the rotor assembly, an inner rotor 1 being sleeved on one side of the rotor shaft 10, an outer rotor 2 being provided on the outer periphery of the inner rotor 1, a high-pressure oil outlet chamber and a low-pressure oil return chamber being formed between the inner rotor 1 and the outer rotor 2, the high-pressure oil outlet chamber and the low-pressure oil return chamber being connected through an oil channel, and the oil channel flows through the rotating contact surfaces of the rotor housing 18, the oil pump housing 7 and the rotor shaft 10.

[0025] A bearing bush 19 is installed in the oil pump housing 7, a rotor hole is provided in the rotor housing 18, and both sides of the rotor shaft 10 are in rotational contact with the bearing bush 19 and the rotor hole respectively.

[0026] An oil inlet hole 12 and an oil return hole are provided in the rotor housing 18. A first lubrication groove 14 is provided on the inner wall of the rotor hole. An axial oil hole 15 is provided in the rotor shaft 10. First and second radial holes 13 and 16 are provided on both sides of the rotor shaft 10, communicating with the axial oil hole 15. A bearing lubrication groove 17 is provided on the inner circumference of the bearing shell 19. The high-pressure oil outlet chamber, oil inlet hole 12, first lubrication groove 14, first radial hole 13, axial oil hole 15, second radial hole 16, bearing shell lubrication groove 17, the lower portion of the oil pump housing 7, the oil return hole, and the low-pressure oil return chamber are interconnected. These oil holes and oil grooves constitute an oil passage.

[0027] Lubricating oil from the high-pressure oil outlet chamber flows through oil inlet hole 12 into first lubrication groove 14. A portion of the pressurized oil lubricates the rotor bore. Another portion flows through first radial hole 13 into axial oil hole 15, and finally through second radial hole 16 into bearing lubrication groove 17 to lubricate bearing 19. This oil channel structure ensures a pressurized oil supply to the bearing, forming a hydrostatic bearing, improving bearing reliability, and increasing the efficiency of the oil pump at low speeds.

[0028] The oil inlet hole 12 is obliquely located at the upper portion of the rotor housing 18 , and the oil return hole is horizontally arranged at the lower portion of the rotor housing 18 .

[0029] The controller 4 is installed in the controller housing 6 , and the controller is connected to the stator assembly 3 via a line.

[0030] The stator assembly 3 is fixedly mounted in the oil pump housing 7 , and the outer rotor 2 is rotatably mounted in the rotor housing 18 .

[0031] The oil pump housing 7 is a metal stamping part, which is injection-molded as one piece with the controller housing 6 made of plastic material to form a motor mounting support and a controller mounting support. The controller housing 6 is also provided with an electrical interface.

[0032] The controller cover 5 is a metal stamping part, and its main function is to form a seal for the controller cavity; the controller cover 5 and the controller housing 6 are sealed with glue.

[0033] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An electronic oil pump using a hydrostatic bearing, comprising an oil pump housing (7), a rotor housing (18) and a pump cover (8) being mounted in sequence on one side of the oil pump housing (7), and a controller housing (6) and a controller cover (5) being mounted in sequence on the other side, characterized in that: A rotor assembly is rotatably mounted in an oil pump housing (7) and a rotor housing (18). A stator assembly (3) is provided on the outer periphery of the rotor assembly. A rotor shaft (10) is located in the middle of the rotor assembly. An inner rotor (1) is sleeved on one side of the rotor shaft (10). An outer rotor (2) is provided on the outer periphery of the inner rotor (1). A high-pressure oil outlet chamber and a low-pressure oil return chamber are formed between the inner rotor (1) and the outer rotor (2). The high-pressure oil outlet chamber and the low-pressure oil return chamber are connected via an oil passage. The oil passage flows through the rotating contact surfaces of the rotor housing (18), the oil pump housing (7) and the rotor shaft (10).

2. The electronic oil pump using a hydrostatic bearing according to claim 1, wherein: A bearing bush (19) is installed in the oil pump housing (7), a rotor hole is provided in the rotor housing (18), and both sides of the rotor shaft (10) are in rotational contact with the bearing bush (19) and the rotor hole respectively.

3. The electronic oil pump using a hydrostatic bearing according to claim 2, wherein: An oil inlet hole (12) and an oil return hole are provided in the rotor housing (18), a first lubrication groove (14) is provided on the inner wall of the rotor hole, an axial oil hole (15) is provided in the axial direction of the rotor shaft (10), a first radial hole (13) and a second radial hole (16) are provided on both sides of the rotor shaft (10) and are communicated with the axial oil hole (15), a bearing bush lubrication groove (17) is provided on the inner periphery of the bearing bush (19), and the high-pressure oil outlet cavity, the oil inlet hole (12), the first lubrication groove (14), the first radial hole (13), the axial oil hole (15), the second radial hole (16), the bearing bush lubrication groove (17), the lower part of the oil pump housing (7), the oil return hole, and the low-pressure oil return cavity are connected; the above-mentioned oil holes and oil grooves constitute an oil passage.

4. The electronic oil pump using a hydrostatic bearing as claimed in claim 3, characterized in that: The oil inlet hole (12) is obliquely located at the upper portion of the rotor housing (18), and the oil return hole is horizontally arranged at the lower portion of the rotor housing (18).

5. The electronic oil pump using a hydrostatic bearing according to claim 1, wherein: A controller (4) is installed in the controller housing (6), and the controller is connected to the stator assembly (3) via a line.

6. The electronic oil pump using a hydrostatic bearing according to claim 1, wherein: The stator assembly (3) is fixedly mounted in the oil pump housing (7), and the outer rotor (2) is rotatably mounted in the rotor housing (18).

7. The electronic oil pump using a hydrostatic bearing according to claim 1, wherein: The oil pump housing (7) is a metal stamping part, and is injection-molded into one piece with the controller housing (6) made of plastic.

8. The electronic oil pump using a hydrostatic bearing according to claim 1, wherein: The controller cover (5) is a metal stamping part.

9. The electronic oil pump using a hydrostatic bearing according to claim 1, wherein: The controller cover (5) and the controller housing (6) are sealed with glue.

Images