Integrated electronic oil pump

Abstract

To provide a highly-integrated electronic oil pump which is rational in structure design, high in an integration degree, small in a volume, light in weight, and excellent in a cooling effect to a power generation element.SOLUTION: A highly-integrated electronic oil pump includes an electric machine and a pump casing having a rotor pump attached into the electric machine, in which a ball bearing is arranged between the electric machine and the rotor pump, the electronic machine is constituted of a stator assembly and an electric machine rotor, the rotor pump is constituted of an inner gear, an outer gear and a pin, the hollow electric machine rotor is attached to the inside of the stator assembly, the outer gear is arranged in the electric machine rotor, a volume of a system is reduced by making the outer gear integrated to the electric machine rotor, and integrally pressure-fit thereto, a bushing is attached to a center of the electric machine rotor, the pin is arranged inside the bushing, the inner gear is arranged outside the bushing, the inner gear and the pin are pressure-fit to the bushing, and the inner gear and the outer gear are engaged with each other.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to the technical field of electronic oil pumps for new energy vehicles, and more specifically to highly integrated electronic oil pumps.

Background Art

[0002] With the electrification of automobiles and the rapid development of new energy vehicles, integrated electronic oil pumps are being increasingly applied due to their high efficiency, energy saving, and flexible control. An integrated electronic oil pump mainly consists of three parts: components such as a rotor pump, an electric motor, and a controller.

[0003] Currently, most of the electronic oil pump bodies are large in volume, occupy a large space, and have a high manufacturing cost. Most of the bearings between the electric motor and the rotor pump are attached to the bearing brackets, thus making the electronic oil pump taller. There are cavities between many pump casings and the rotor pump, resulting in a large friction on the end face of the rotor pump. tree Consequently, the loss of the rotor pump increases. If the temperature of the drive motor stator is too high, the stator in the drive motor will be damaged. Although the oil in the gearbox needs to cool down the stator in the drive motor, currently, the path through which most lubricating oil flows through the stator is high, affecting the cooling effect. tree

[0004] The main purpose of the present invention is to provide a highly integrated electronic oil pump with a reasonable structural design, a small volume, an excellent cooling effect, and a low manufacturing cost.

Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention aims to provide a highly integrated electronic oil pump that is small in volume, has a short cooling time required for the stator, has a small friction on the end face of the rotor pump, and can effectively improve the efficiency of the electronic oil pump system.

[0006] The technical solution of the present invention is as follows.

[0007] A highly integrated electronic oil pump comprising a pump casing containing an electric motor and a rotor pump mounted inside the electric motor, with a ball bearing provided between the electric motor and the rotor pump, wherein the electric motor consists of a stator assembly and an electric motor rotor, and the rotor pump consists of an internal gear, an external gear and a pin, wherein a hollow electric motor rotor is mounted inside the stator assembly, an external gear is provided inside the electric motor rotor, and the external gear is integrated with the electric motor rotor and pressed together as a single unit, thereby significantly reducing the volume of the system, a bushing is mounted at the center of the electric motor rotor, a pin is provided inside the bushing, an internal gear is provided outside the bushing, and the pin is connected to the bushing to Press-fit , The internal gear and the external gear mesh together.

[0008] Furthermore, the ball bearing is attached to the end of the rotor pump, and the ball bearing is placed between the electric rotor and the external gear so that there is no cavity between the electric motor and the rotor pump, thereby reducing the height of the electronic oil pump, significantly reducing the weight of the rotor pump, and reducing the volume of the rotor pump.

[0009] Furthermore, the ball bearings are manufactured using the same mechanical jigs as the pump casings, ensuring uniformity of the clearance between the stator and rotor of the electric motor.

[0010] Furthermore, the thermal expansion coefficients of the electric stator and the rotor pump body are matched, significantly reducing the impact of temperature on the gaps in the oil pump.

[0011] Furthermore, the pump casing is provided with an oil inlet and an oil outlet.

[0012] Furthermore, the electric rotor and external gear are driven so that the internal gear rotates around the bushing, pressurizing the coolant flowing in from the oil inlet. The pressurized coolant then flows through the pin to the stator assembly, cooling the stator assembly, and the heat-exchanged coolant is then re-pressurized. and low The oil is allowed to flow up to the pressure region, and the other pressurized cooling oil is discharged directly from the oil outlet through the high-pressure region.

[0013] Furthermore, a passage for cooling oil is provided inside the pin. [Effects of the Invention]

[0014] Compared to the conventional technology, the beneficial effects of the present invention are as follows: 1) By employing the technical means of the present invention and providing an external gear inside the rotor of the electric pump, the external gear is integrated and pressed together with the electric rotor, significantly reducing the volume of the system, reducing the weight of the system, and significantly reducing the cost of system materials and manufacturing, while also effectively reducing friction in the rotor pump cavity and contributing to improved system efficiency. 2) The ball bearing of the present invention is attached to the end of the rotor pump and is provided between the electric rotor and the external gear so as to eliminate any gap between the electric and the rotor pump, thereby reducing the height of the electronic oil pump, significantly reducing the weight of the rotor pump, and reducing the volume of the rotor pump. 3) In the present invention, compared to the conventional method in which the electric rotor of an electronic oil pump is press-fitted into a ball bearing bracket before being press-fitted into the ball bearing and pump gear, the ball bearing bracket is not installed, which shortens the overall height of the electronic oil pump, shortens the path of pressurized cooling oil to the stator assembly, reduces the time required, and improves the temperature reduction effect. On the other hand, cumulative mounting errors are avoided, and there is no hidden risk of air gap eccentricity. 4) The external gear and electric rotor of the rotor pump of the present invention are directly mounted on ball bearings, directly controlling the clearance at the end face of the rotor pump, the external gear drives the chassis to rotate synchronously, significantly reducing friction at the end face of the pump, and effectively improving the efficiency of the system. 5) In this invention, the external gears are integrated into the electric rotor, and the thermal expansion coefficients of the electric stator and pump body match, thereby significantly reducing the effect of temperature on the oil pump gap, accurately ensuring the gap at the pump end face, and effectively reducing or avoiding the effect of temperature on the system's flow efficiency. 6) The ball bearing of the present invention is manufactured using the same mechanical jigs as the pump casing, and therefore both have extremely precise coaxiality and concentricity, allowing for precise control of the eccentricity of the air gap. 7) The precise air gap control of the outer diameter of the ball bearing and the inner diameter of the pump casing in this invention allows the ball bearing, which does not have a bearing bracket, to directly control the gap at the end face of the pump, effectively reducing and eliminating the hidden risk of eccentricity of the air gap when connecting the ball bearing and the pump gears. 8) In this invention, the electric rotor and external gear are driven together so that the internal gear rotates around the bushing, pressurizing the cooling oil flowing in from the oil inlet, which in turn causes the pressurized cooling oil to flow through the pin to the stator assembly, cooling the stator assembly and effectively reducing the temperature of the heat-generating elements. 9) The pin of the present invention is statically fixed, the bushing is press-fitted onto the pin, the internal gear rotates, and the internal gear rotates relative to the bushing due to the drive of the external gear, lubricating each other and reducing friction, thereby reducing losses in the pump system and effectively improving the rotational stability of the pump. 10) Compared to conventional electronic oil pumps, the present invention shortens the time it takes for pressurized cooling oil to flow to the stator assembly, resulting in a superior temperature reduction effect. 11) The highly integrated electronic oil pump of the present invention has a rational structural design, a high degree of integration, a small volume, light weight, and excellent cooling effect on heat-generating elements. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a schematic diagram of the overall structure of the highly integrated electronic oil pump of the present invention. [Figure 2] Figure 2 is a cross-sectional view of the highly integrated electronic oil pump of the present invention.

Embodiments for Carrying out the Invention

[0016] Hereinafter, the present invention will be further described with reference to the drawings, but the scope of protection of the present invention is not limited to the above scope.

[0017] As shown in Figure 1, a highly integrated electronic oil pump includes a pump casing 1. An oil inlet 101 is provided at the bottom of the pump casing 1, and an oil outlet 102 is provided on the side of the pump casing 1. A filter 14 for filtering lubricating oil is provided at the oil inlet 101.

[0018] In this embodiment, an aluminum chassis is used as the pump casing 1.

[0019] [[ID=V25]] Inside the pump casing 1, an electric motor and a rotor pump attached to the electric motor are provided. A ball bearing 7 is provided between the electric motor and the rotor pump, and the ball bearing is provided at the end of the rotor pump. The electric motor is composed of a stator assembly and an electric motor rotor 2, and the rotor pump is composed of an internal gear 6, an external gear 3 and a pin 5.

[0020] As shown in Figure 2, an electric motor rotor 2 is attached inside the stator assembly. An external gear 3 is provided inside the electric motor rotor 2, and the external gear 3 is integrated with the electric motor rotor 2 and press-fitted together. A bushing 4 is attached to the center of the electric motor rotor 2. A pin 5 is provided inside the bushing 4, and an internal gear 6 is provided outside the bushing 4. The pin 5 is press-fitted into the bushing 4, and the internal gear 6 and the external gear 3 mesh with each other. to and is press-fitted, and the internal gear 6 and the external gear 3 mesh with each other.

[0021] The external gear of the present invention is integrated with the motor rotor 2 and integrally press-fitted, on the one hand, significantly reducing the volume of the system, reducing the weight of the system, and significantly reducing the cost of system materials and manufacturing, and on the other hand, effectively reducing the friction of the rotor pump cavity and contributing to the improvement of the system efficiency.

[0022] The ball bearing 7 of the present invention is provided between the external gear 3 and the pump casing 1. The ball bearing 7 supports the motor rotor 2, ensures the rotation of the external gear 3 in the rotor pump, and the ball bearing 7 is provided at the end of the rotor pump so as to eliminate the cavity between the motor and the rotor pump, reduce the height of the electronic oil pump, significantly reduce the weight of the rotor pump, and reduce the volume of the rotor pump.

[0023] In the present invention, compared with the case where the motor rotor of the conventional electronic oil pump is press-fitted into the ball bearing bracket and then press-fitted into the ball bearing and the pump gear, the ball bearing bracket is not installed. On the one hand, the overall height of the electronic oil pump is shortened, the path of the cooling oil pressurized to the stator assembly is shortened, the time is shortened, and the temperature reduction effect is better. On the other hand, the cumulative mounting error is avoided, and there is no hidden risk of air gap eccentricity.

[0024] In the embodiment, the ball bearing 7 is processed by the same machine fixture as the pump casing 1. Therefore, both have very precise coaxiality and concentricity, and the eccentricity of the air gap can be precisely controlled.

[0025] In the present invention, the external gear is integrated with the motor rotor, and since the thermal expansion coefficients of the stator 8 of the motor and the pump body are the same, the influence of temperature on the oil pump gap is significantly reduced, the gap at the end face of the pump is accurately guaranteed, and the influence of temperature on the flow efficiency of the system is effectively reduced or avoided.

[0026] The algorithm for the cooling oil of the present invention to cool the stator assembly is as follows.

[0027] The electric rotor 2, together with the external gear 3, drives the internal gear 6 to rotate around the bushing 4, pressurizing the coolant flowing in from the oil inlet 101. The pressurized coolant flows through the pin 5 to the stator assembly, cooling the stator assembly, and the heat-exchanged coolant is then re-cooled. and low Ensure it flows down to the pressure zone.

[0028] Furthermore, the other pressurized cooling oil is discharged directly from the oil outlet 102 through the high-pressure region.

[0029] In this embodiment, a passage for cooling oil is provided inside the pin 5.

[0030] Furthermore, pin 5 has either a hollow or solid structure.

[0031] As will be explained in detail here, the pin 5 of the present invention is statically fixed, and the bushing 4 is pressed into the pin 5 and attached as is. The internal gear 6 rotates, and the internal gear 6 of the pump rotates relative to the bushing 4 driven by the external gear 3, lubricating each other and reducing friction, thereby reducing losses in the rotor pump system and effectively improving the rotational stability of the rotor pump.

[0032] Because the overall height of the electronic oil pump is reduced, the time it takes for the pressurized cooling oil to flow to the stator assembly is shorter in this invention compared to conventional electronic oil pumps, resulting in a superior temperature reduction effect.

[0033] In this embodiment, the stator assembly includes a stator 8 and stator windings 9 attached to the stator 8. In this embodiment, the stator 8 is made from silicon steel sheet material, which reduces manufacturing costs and frictional force of the rotating members. The wire diameter of the stator windings 9 is 1.8 mm, which significantly improves the performance of the rotor pump compared to the conventional 1.6 mm.

[0034] In this embodiment, a radial magnet 10 is attached to the soft magnetic alloy rotor 2 to monitor its position.

[0035] To simplify the design of the electronically controlled components, the conventional windings are simplified, and a hub 11 is provided above the stator assembly. Stator windings 9 The pin is connected to hub 6.

[0036] A controller 12 is provided above the hub 11. The controller 12 of the present invention enables rapid response and has features such as circuit reverse connection protection, signal interference prevention, oil temperature monitoring, overheating prevention, independent communication channel, detection of electrical angular position, reception and calculation of electrical rotation speed comparison, and adjustment of the actual rotor rotation speed for rationality.

[0037] To separate the oil circuit from the electronic control section, a heat insulating sealing plate 13 is provided between the controller 12 and the hub 11, improving sealing performance, and a fixing structure is assembled inside the oil pump by bolts. Teru To avoid this, the heat insulating sealing plate 13 and the hub 11 are fitted together, connected, and fixed in place.

[0038] A PTC temperature sensor (not shown) is attached to the heat-insulating sealing plate 13 for detecting and providing feedback on the coolant temperature, and the PTC temperature sensor (not shown) is electrically connected to the controller 12. The PTC temperature sensor in this invention can accurately detect the oil temperature to a degree of 0.1°C.

[0039] In this invention, the specific process for cooling the stator assembly is as follows: 1) First, the equipment is turned on, at which point the controller 12 is energized, the controller 12 converts the electricity into three-phase electricity, and supplies power to the stator winding 9 in the hub 11, causing the electric rotor 2 and external gear 3 to rotate by electromagnetic force, and the rotation of the electric rotor 2 and external gear 3 causes the cooling oil flowing in from the oil inlet 101 to pass through the filter 14 and then enter the low-pressure region. 2) The electric rotor 2, together with the external gear 3, drives the internal gear 6 to rotate around the bushing 4, pressurizing the coolant flowing in from the oil inlet 101. The pressurized coolant flows through the pin 5 to the stator assembly, cooling the stator assembly, and the heat-exchanged coolant is then re-cooled. and low The oil is allowed to flow up to the atmospheric pressure range, and centrifugal force is generated by the difference in internal and external gears to pressurize the cooling oil. At this time, the PTC temperature sensor feeds back the current oil temperature value and also feeds back this temperature value to the controller 12, which in turn feeds back the current oil temperature value to an external control system. 3) The other pressurized cooling oil is discharged directly from the oil outlet 102 after passing through the high-pressure region. [Explanation of Symbols]

[0040] 1. Pump casing 101 Oil Inlet 102 Oil outlet 2 Electric rotor 3 External gears 4 Bushing 5 pins 6 Internal gear 7 ball bearings 8 stators 9 Stator windings 10 Radial Magnets 11 Hubs 12 controllers 13. Insulating sealing plate 14 filters.

Claims

1. An integrated electronic oil pump comprising an electric motor and a rotor pump mounted inside the electric motor, the electric motor comprising a stator assembly and an electric motor rotor (2), the rotor pump comprising an internal gear (6), an external gear (3), and a pin (5), and a ball bearing (7) provided between the outer surface of the external gear (3) and the inner surface of the pump casing (1) so as to be mounted on the end of the rotor pump, A hollow electric rotor (2) is mounted inside the stator assembly, an external gear (3) is provided inside the electric rotor (2), the external gear (3) is pressed into the electric rotor (2) and integrated with it, a bushing (4) is mounted at the center of the electric rotor (2), a pin (5) is provided inside the bushing (4), an internal gear (6) is provided outside the bushing (4), the pin (5) is pressed into the bushing (4), and the internal gear (6) and the external gear (3) mesh together. An integrated electronic oil pump characterized in that an oil inlet (101) is provided at the bottom of the pump casing (1), and an oil outlet (102) is provided at the side of the pump casing (1).

2. The ball bearing (7) is manufactured using the same mechanical jig as the pump casing (1). The integrated electronic oil pump according to feature 1.

3. The stator assembly includes a stator (8) and stator windings (9) attached to the stator (8), wherein the stator (8) and the internal gear (6), external gear (3), and pin (5) of the rotor pump have matching coefficients of thermal expansion. The integrated electronic oil pump according to feature 1.

4. A passage for coolant is provided inside the pin (5), and the electric rotor (2) and the external gear (3) are driven so that the internal gear (6) rotates around the bushing (4), thereby pressurizing the coolant flowing in from the oil inlet (101). The pressurized coolant flows through the pin (5) to the stator assembly, cooling the stator assembly, while the other pressurized coolant is discharged directly from the oil outlet (102). The integrated electronic oil pump according to feature 1.

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