Highly-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 in particular to a highly integrated electronic oil pump. [Background technology]

[0002] With the rapid development of automobile electrification and new energy vehicles, the integrated electronic oil pump is increasingly being used due to its high efficiency, energy saving and flexible control. The integrated electronic oil pump is mainly composed of three parts: rotor pump, motor, controller and other components.

[0003] At present, most electronic oil pump bodies are large in volume, occupy a large space, and have high manufacturing costs. Most bearings between the motor and the rotor pump are mounted on a bearing bracket, which makes the electronic oil pump expensive. There are cavities between most pump casings and the rotor pump, which increases the friction of the end faces of the rotor pump, and therefore increases the loss of the rotor pump. If the temperature of the stator of the driving motor is too high, the stator in the driving motor will be damaged. The oil in the gearbox needs to reduce the temperature and cool the stator in the driving motor. At present, the path through which most of the lubricating oil flows through the stator is high, which affects the cooling effect.

[0004] SUMMARY OF THE PRESENT EMBODIMENT The present invention aims to provide a highly integrated electronic oil pump with reasonable structural design, small volume, excellent cooling effect and 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 has a small volume, requires a short time for cooling 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 solutions of the present invention are as follows:

[0007] The highly integrated electronic oil pump includes a pump casing having an electric motor and a rotor pump mounted inside the electric motor, a ball bearing is provided between the electric motor and the rotor pump, the electric motor is composed of a stator assembly and an electric rotor, and the rotor pump is composed of an internal gear, an external gear and a pin, a hollow electric rotor is mounted inside the stator assembly, an external gear is provided inside the electric rotor, and the external gear is integrated with the electric rotor and pressed together to significantly reduce the volume of the system, a bushing is mounted at the center of the electric rotor, a pin is provided inside the bushing, and an internal gear is provided outside the bushing, the internal gear and the pin are each pressed together with the bushing, and the internal gear and the external gear mesh with each other.

[0008] Furthermore, a ball bearing is mounted at the end of the rotor pump, and the ball bearing is disposed between the electric motor rotor and the external gear, so as to eliminate any cavity between the electric motor and the rotor pump, thereby reducing the height of the electronic oil pump, greatly reducing the weight of the rotor pump, and reducing the volume of the rotor pump.

[0009] Furthermore, the ball bearings are machined on the same machine fixtures as the pump casings, ensuring uniformity of the gap between the stator and rotor of the electric machine.

[0010] Furthermore, the thermal expansion coefficients of the stator of the electric machine and the pump body of the rotor pump match, greatly reducing the effect 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 the external gear drive the internal gear to rotate around the bushing, pressurizing the cooling oil flowing in from the oil inlet, so that one pressurized cooling oil flows to the stator assembly through the pin and cools the stator assembly, and the heat-exchanged cooling oil flows back to the low pressure region, and the other pressurized cooling oil passes through the high pressure region and is discharged directly from the oil outlet.

[0013] Furthermore, a flow passage through which cooling oil flows is provided inside the pin. Effect of the Invention

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) By adopting the technical means of the present invention, an external gear is provided inside the rotor of the motor, and the external gear is integrated with the rotor of the motor and pressed together, which on the one hand greatly reduces the volume of the system, reduces the weight of the system, and significantly reduces the costs of the system materials and manufacturing; on the other hand, it effectively reduces the friction of the rotor pump cavity, which is conducive to improving the efficiency of the system; 2) The ball bearing of the present invention is mounted on the end of the rotor pump, and is arranged between the electric motor rotor and the external gear, so as to eliminate any cavity between the electric motor and the rotor pump, thereby reducing the height of the electronic oil pump, greatly reducing the weight of the rotor pump, and reducing the volume of the rotor pump; 3) Compared with the case where the electric rotor of the conventional electronic oil pump is pressed into the ball bearing bracket and then pressed into the ball bearing and pump gear, the present invention does not install the ball bearing bracket, which on the one hand shortens the overall height of the electronic oil pump, shortens the path of the pressurized cooling oil to the stator assembly, shortens the time required, and improves the temperature reduction effect; on the other hand, it avoids the cumulative installation error and eliminates the hidden risk of air gap eccentricity. 4) The external gear and the electric rotor of the rotor pump of the present invention are directly mounted on the ball bearing, which directly controls the clearance of the end face of the rotor pump, and the external gear drives the chassis to rotate synchronously, which greatly reduces the friction of the end face of the pump and effectively improves the efficiency of the system; 5) In the present invention, the external gear is integrated into the motor rotor, and the thermal expansion coefficients of the motor stator and the pump body are consistent, which greatly reduces the impact of temperature on the oil pump clearance, accurately guarantees the clearance of the pump end face, and effectively reduces or avoids the impact of temperature on the flow efficiency of the system; 6) The ball bearing of the present invention is machined using the same machine tool as the pump casing, so that the two have very precise coaxiality and concentricity, and the eccentricity of the air gap can be precisely controlled. 7) The precise air gap control of the outer diameter of the ball bearing and the inner diameter of the pump casing of the present invention allows the ball bearing without bearing bracket to directly control the clearance on the end face of the pump, effectively reducing and eliminating the hidden risk of air gap eccentricity when the ball bearing is connected with the pump gear; 8) In the present invention, the electric motor rotor and the external gear together drive the internal gear to rotate around the bushing, pressurizing the cooling oil flowing in from the oil inlet, so that the pressurized cooling oil flows to the stator assembly through the pin, cooling the stator assembly and effectively reducing the temperature of the heating element; 9) The pin of the present invention is designed to be statically fixed, and the bushing is directly pressed into the pin to install it. The internal gear rotates, and the external gear drives the internal gear to rotate relative to the bushing, lubricating each other and reducing friction, which reduces the loss of the pump system and effectively improves the rotation stability of the pump. 10) Compared to conventional electronic oil pumps, the time it takes for pressurized cooling oil to flow to the stator assembly is shorter in the present invention, and the temperature reduction effect is more excellent. 11) The highly integrated electronic oil pump of the present invention has a reasonable structural design, a high degree of integration, a small volume, a light weight, and an excellent cooling effect for heat-generating elements. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic diagram of the overall structure of the highly integrated electronic oil pump of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of the highly integrated electronic oil pump of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

[0019] Inside the pump casing 1, there is an electric motor and a rotor pump attached to the electric motor, 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 rotor 2 is attached to the inside of the stator assembly, an external gear 3 is provided inside the electric rotor 2, and the external gear 3 is integrated with the electric rotor 2 and pressed together. A bushing 4 is attached to the center of the electric rotor 2, a pin 5 is provided inside the bushing 4, and an internal gear 6 is provided outside the bushing 4. The internal gear 6 and the pin 5 are each pressed together with the bushing 4, 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 electric motor rotor 2 and pressed together, which on the one hand greatly reduces the volume of the system, reduces the weight of the system, and significantly reduces the costs of system materials and manufacturing, and on the other hand effectively reduces the friction in the rotor pump cavity, contributing to improving the efficiency of the system.

[0022] The ball bearing 7 of the present invention is installed between the electric motor rotor 2 and the external gear 3, the ball bearing 7 supports the electric motor rotor 2 and ensures the rotation of the external gear 3 in the rotor pump, and the ball bearing 7 is installed at the end of the rotor pump so as to eliminate any cavity between the electric motor and the rotor pump, thereby reducing the height of the electronic oil pump, greatly reducing the weight of the rotor pump, and reducing the volume of the rotor pump.

[0023] Compared with the case where the electric rotor of the conventional electronic oil pump is pressed into the ball bearing bracket and then pressed into the ball bearing and pump gear, in the present invention, the ball bearing bracket is not installed, which on the one hand shortens the overall height of the electronic oil pump, shortens the path of the pressurized cooling oil to the stator assembly, shortens the time required, and improves the temperature reduction effect, on the other hand, avoids the cumulative installation error and eliminates the hidden risk of air gap eccentricity.

[0024] In the embodiment, the ball bearing 7 is machined on the same machine tool as the pump casing 1 so that they 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 into the motor rotor, and the thermal expansion coefficients of the motor stator 8 and the pump body are consistent, which greatly reduces the impact of temperature on the oil pump clearance, accurately guarantees the clearance at the end face of the pump, and effectively reduces or avoids the impact of temperature on the flow efficiency of the system.

[0026] The algorithm by which the cooling oil of the present invention cools the stator assembly is as follows:

[0027] The electric rotor 2 drives the internal gear 6 together with the external gear 3 to rotate around the bushing 4, pressurizing the cooling oil flowing in from the oil inlet 101, so that one of the pressurized cooling oil flows to the stator assembly through the pins 5 and cools the stator assembly, and the heat-exchanged cooling oil flows back to the low-pressure area.

[0028] The other pressurized cooling oil is discharged directly from the oil outlet 102 via the high pressure region.

[0029] In this embodiment, the pin 5 is provided therein with a flow passage through which cooling oil flows.

[0030] Moreover, the pin 5 has a hollow structure or a solid structure.

[0031] It will be particularly noted here that the pin 5 of the present invention is designed to be statically fixed, and the bushing 4 is simply pressed into the pin 5 to mount it. The internal gear 6 rotates, and the external gear 3 drives the internal gear 6 of the pump to rotate relative to the bushing 4, lubricating each other and reducing friction, thereby reducing the system loss of the rotor pump and effectively improving the rotation stability of the rotor pump.

[0032] Since the overall height of the electronic oil pump is reduced, the time it takes for pressurized cooling oil to flow to the stator assembly is shorter in the present invention than in the conventional electronic oil pump, and the temperature reduction effect is more excellent.

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

[0034] In this embodiment, the soft magnetic alloy rotor 2 is fitted with a radial magnet 10 for monitoring its position.

[0035] To simplify the design of the electronic control components, the conventional windings have been simplified and a hub 11 is provided above the stator assembly. The pins of the stator windings 10 are connected to the hub 6.

[0036] A controller 12 is provided above the hub 11. The controller 12 of the present invention realizes quick response and has the features of circuit reverse connection protection, signal interference prevention, oil temperature monitoring, overheating prevention, independent communication channel, motor angle position detection, motor rotation speed comparison receiving and calculation, and rational adjustment of the actual rotor rotation speed.

[0037] In order 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. The heat insulating sealing plate 13 and the hub 11 are fitted together, connected and fixed to each other, improving sealing performance and avoiding the need to assemble a fixing structure inside the oil pump with bolts.

[0038] A PTC temperature sensor (not shown) for detecting and feeding back the cooling oil temperature is attached to the heat insulating sealing plate 13, and the PTC temperature sensor (not shown) is electrically connected to the controller 12. The PTC temperature sensor in the present invention can accurately detect the oil temperature to within 0.1°C.

[0039] In the present invention, the specific process of cooling the stator assembly is as follows: 1) First, the device is turned on. At this time, the controller 12 is energized, the controller 12 converts electricity into three-phase electricity and supplies it to the stator winding 9 in the hub 11. The electric rotor 2 and the external gear 3 are rotated and driven by electromagnetic force. The rotation of the electric rotor 2 and the 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 area. 2) The electric motor rotor 2 drives the internal gear 6 together with the external gear 3 to rotate around the bushing 4, pressurizing the cooling oil flowing in from the oil inlet 101, so that one of the pressurized cooling oil flows to the stator assembly through the pin 5 to cool the stator assembly, and the heat-exchanged cooling oil flows back to the low-pressure area, and the centrifugal force is generated by the difference between the 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 the temperature value to the controller 12, and the controller 12 feeds back the current oil temperature value to an external control system. 3) The other pressurized cooling oil passes through the high pressure region and is then discharged directly from the oil outlet 102. [Explanation of symbols]

[0040] 1 Pump casing 101 Oil inlet 102 Oil outlet 2 Electric rotor 3 External gear 4 Bushings 5-pin 6 Internal Gear 7 ball bearings 8. Stator 9 Stator Winding 10 Radial Magnet 11. Hub 12 Controller 13 Heat insulating sealing plate 14 Filters.

Claims

1. A highly integrated electronic oil pump comprising a pump casing (1) in which an electric motor and a rotor pump mounted inside the electric motor are provided, a ball bearing (7) is provided between the electric motor and 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), A hollow electric rotor (2) is attached inside the stator assembly, an external gear (3) is provided inside the electric rotor (2), and the external gear (3) is integrated with the electric rotor (2) and pressed together. A bushing (4) is attached to 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), and the internal gear (6) and the pin (5) are each pressed together with the bushing (4), so that the internal gear (6) and the external gear (3) mesh with each other. A highly integrated electronic oil pump.

2. The ball bearing (7) is provided between the electric rotor (2) and the external gear (3) so as to be mounted on the end of the rotor pump.

2. The highly integrated electronic oil pump according to claim 1.

3. The ball bearing (7) is machined using the same machine tool as the pump casing (1).

2. The highly integrated electronic oil pump according to claim 1.

4. The thermal expansion coefficients of the stator of the electric motor and the pump body of the rotor pump are the same.

3. The highly integrated electronic oil pump according to claim 2.

5. The pump casing (1) is provided with an oil inlet (101) and an oil outlet (102).

2. The highly integrated electronic oil pump according to claim 1.

6. The electric rotor (2) and the external gear (3) drive the internal gear (6) to rotate around the bushing (4) to pressurize the cooling oil flowing in from the oil inlet (101), so that one pressurized cooling oil flows to the stator assembly through the pin (5) and cools the stator assembly, and the heat-exchanged cooling oil flows back to the low pressure area, and the other pressurized cooling oil passes through the high pressure area and is discharged directly from the oil outlet (102).

6. A highly integrated electronic oil pump as claimed in claim 5.

7. The pin (5) has a passage therein through which cooling oil flows.

7. A highly integrated electronic oil pump according to claim 1 or 6.

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