Integrated electronic oil pump

Abstract

The utility model discloses an integrated electronic oil pump which comprises a pump shell, an oil inlet hole and an oil outlet hole and further comprises a fixed shaft arranged in the pump shell, and a flow channel allowing cooling oil to pass through is formed in the fixed shaft; the inner gear and the fixed shaft deviate from the axis and are rotationally connected; the outer gear is coaxially connected with the fixed shaft and rotationally connected into the pump shell, and the outer gear is located on the periphery of the inner gear and meshed with the inner gear; the motor rotor is fixedly connected to the periphery of the outer gear; the motor stator is located on the periphery of the rotor and fixedly connected with the pump shell; wherein one end of the flow channel is communicated with the oil inlet hole, and cooling oil can realize internal circulation through the flow channel. The integrated electronic oil pump has the advantages of being simple in design and high in cooling oil circulation efficiency. Meanwhile, due to the design of the double oil inlets, circulation of oil liquid is accelerated, the circulation efficiency of the oil liquid is obviously improved, and then the cooling efficiency and the lubricating efficiency of the electronic oil pump in application are improved.

Description

Technical Field

[0001] This application relates to the technical field of electronic oil pumps for new energy vehicles, and particularly to an integrated electronic oil pump. Background Art

[0002] With the rapid development of automotive electronics and new energy vehicles, integrated high-precision electronic oil pumps have been increasingly used due to their high efficiency, energy conservation, and flexible control.

[0003] Currently, electronic oil pumps mainly consist of three parts: components such as a rotor pump, a motor, and a controller. The controller controls the operation of the motor, which in turn drives the rotation of the rotor pump to achieve the operation of the electronic oil pump.

[0004] However, the existing electronic oil pumps have the disadvantages of complex structure and low cooling oil circulation efficiency, and there is still room for improvement. Summary of the Invention

[0005] In view of this, an object of this application is to provide an integrated electronic oil pump. This electronic oil pump has the advantages of simple design, compact structure, and high working efficiency.

[0006] This application provides an integrated electronic oil pump, which includes a pump housing, an oil inlet hole, and an oil outlet hole, and further includes: a fixed shaft disposed inside the pump housing, and a flow channel for cooling oil to pass through is provided inside the fixed shaft; an internal gear, which is eccentric to the fixed shaft and rotatably connected; an external gear, which is coaxially connected to the fixed shaft and rotatably connected inside the pump housing, the external gear is located outside the internal gear and meshes with the internal gear; a motor rotor, fixedly connected to the outer periphery of the external gear; a motor stator, located outside the rotor and fixedly connected to the pump housing; wherein, one end of the flow channel is communicated with the oil inlet hole, and the cooling oil can realize internal circulation through the flow channel.

[0007] By adopting the above technical solution, an external gear is arranged inside the motor rotor, so that the external gear is integrated into the motor rotor and combined into one body, and the structure is simpler and more compact. The flow channel in the fixed shaft can cool the fixed shaft when the cooling oil passes through, and at the same time, the cooling oil can communicate the upper and lower spaces of the electronic oil pump through the flow channel, facilitating the cooling oil to flow in from below the flow channel to cool the gear, the external gear, the motor rotor, and the motor stator, improving the circulation efficiency of the cooling oil.

[0008] In some embodiments, on the plane passing through the axis of the fixed shaft, the projection areas of the motor stator, the motor rotor, the external gear, the internal gear, and the fixed shaft at least partially overlap.

[0009] By adopting the above technical solutions, the following technical effects can be achieved. First, the height of the electronic oil pump is reduced, significantly reducing the system volume, lightening the system weight, and significantly lowering the system material and production costs. Second, with the reduction of the oil pump height, the cooling oil path for pressurization is shortened, effectively reducing the friction in the rotor pump cavity, which is beneficial to improving the system efficiency. Third, the structure is simple, reducing the cumulative installation errors, enhancing the coaxiality of the motor rotor, motor stator, and external gear, and effectively avoiding the hidden danger of air gap eccentricity. Fourth, the structure is more stable, effectively reducing the vibration and noise during the operation of the pump body, improving the performance of the pump body, enhancing the reliability of the pump body, and extending the working life of the pump body. Fourth, this extremely simple structural design effectively reduces the working vibration and noise of the pump, improving the NVH performance of the electronic oil pump, thereby enhancing the reliability and service life of the oil pump.

[0010] In some embodiments, the electronic oil pump further includes a bearing. One end of the fixed shaft is fixedly connected to the pump housing, and the fixed shaft is connected to the internal gear through the bearing.

[0011] By adopting the above technical solutions, the bearing is arranged between the fixed shaft and the internal gear, making the relative rotation of the internal gear and the fixed shaft smoother. At the same time, it can improve the accuracy and reliability of the assembly position between the internal gear and the fixed shaft.

[0012] In some embodiments, the external gear is connected to the pump housing through a bearing.

[0013] By adopting the above technical solutions, the stability during the rotation of the external gear can be improved, effectively improving the end face clearance, radial clearance of the electronic oil pump, and the air gap of the motor. Furthermore, the performance and efficiency of the electronic oil pump are significantly improved.

[0014] In some embodiments, the electronic oil pump further includes an upper cover. Both ends of the internal gear and both ends of the external gear are respectively connected to the upper cover and the pump housing and jointly enclose a suction and discharge oil cavity.

[0015] In some embodiments, the upper cover is provided with a through hole. The flow channel is communicated with the suction and discharge oil cavity through the through hole, and the cross-sectional area of the through hole gradually increases or gradually decreases in the circumferential direction of the upper cover. Preferably, in the rotation direction of the external gear, the cross-sectional area of the through hole gradually decreases.

[0016] By adopting the above technical solutions, the relative rotation of the internal gear and the external gear causes the cooling oil in the suction and discharge oil cavity to circulate. The flow channel is communicated with the suction and discharge oil cavity through the through hole, enabling the cooling oil to flow into or out of the suction and discharge oil cavity in a cyclic manner. This solution can improve the circulation efficiency of the cooling oil, and further enhance the cooling efficiency and lubrication efficiency of the electronic oil pump.

[0017] In some embodiments, a plurality of oil intake and discharge cavities are formed between the outer gear and the inner gear, and the volume of the oil intake and discharge cavities first increases step by step and then decreases step by step along the rotation direction of the outer gear. The pump housing is provided with an oil inlet hole and an oil outlet hole. When the oil intake and discharge cavities increase step by step, the oil inlet of the oil intake and discharge cavity corresponds to the oil inlet hole, and when the oil intake and discharge cavities decrease step by step, the oil outlet of the oil intake and discharge cavity corresponds to the oil outlet hole.

[0018] In some embodiments, when the oil intake and discharge cavities increase step by step, cooling oil flows into the oil intake and discharge cavities through the oil inlet hole, and when the oil intake and discharge cavities decrease step by step, the cooling oil in the oil intake and discharge cavities is pressurized and discharged from the oil outlet hole.

[0019] In some embodiments, the flow channel is communicated with the oil inlet hole. When the oil intake and discharge cavities increase step by step, cooling oil flows into the oil intake and discharge cavities through the flow channel and the through hole. When the oil intake and discharge cavities decrease step by step, the cooling oil in the oil intake and discharge cavities is pressurized and flows into the flow channel through the through hole.

[0020] By adopting the above technical solution, after the oil fluid is absorbed by the oil inlet hole, under the pressure environment formed by the rotation of the eccentric structure of the inner and outer gears, a part of the oil fluid directly flows into the through hole along the flow channel. At the through hole, with the oil intake and discharge cavities formed by the eccentric structure design of the inner gear and the outer gear, the pressure gradually increases and then decreases, enabling the cooling oil fluid to circulate into or out of the oil intake and discharge cavities repeatedly, taking away the heat generated in the motor and the pump body along with the circulation of the cooling oil fluid, and flowing out from the oil outlet hole. The design of the double oil inlets accelerates the circulation of the oil fluid, significantly improves the circulation efficiency of the oil fluid, and further improves the cooling efficiency and lubrication efficiency of the application of the electronic oil pump.

[0021] In some embodiments, an air gap is left between the motor rotor and the motor stator.

[0022] By adopting the above technical solution, the influence of temperature on the flow efficiency of the system is effectively reduced or avoided.

[0023] In some embodiments, the pump housing is provided with a temperature sensor for detecting and feedbacking the temperature of the cooling oil.

[0024] By adopting the above technical solution, the temperature of the cooling oil can be accurately monitored and feedback controlled.

[0025] In summary, the present application has at least one of the following beneficial technical effects:

[0026] 1. It reduces the height of the electric oil pump, decreases the system volume, lightens the weight, and reduces the cost. It has a simple structure, high assembly precision, high working efficiency, and extends the working life of the product. The electric oil pump of this application presents a smaller aspect ratio, and the pump body structure is more stable, reducing the influence of thermal expansion of different materials caused by temperature on the axial and radial end face clearances of the pump body, and improving the efficiency of the electric oil pump. Using the working method of the electric oil pump of this application, self-cooling can be carried out while realizing the function of the pump, improving the efficiency and life.

[0027] 2. In the electric oil pump of this application, there are no bearings or nuts, and no eccentric calibration parts are used. The top of the shaft is directly inserted into and fixed to the upper cover, and the bottom of the shaft is directly inserted into the bottom of the pump housing, without the connection or fixation of other components. This extremely simple and highly integrated structural design effectively avoids the machining errors of multiple machined parts and effectively reduces the tolerance accumulation generated during the assembly of multiple parts, thereby effectively improving the precision of the electric oil pump and its working efficiency.

[0028] 3. This extremely simple and highly integrated structural design makes the housing, shaft, and pump gear highly and compactly connected as a whole, very effectively improving the end face clearance, radial clearance, and air gap of the motor of the electric oil pump, and thus significantly improving the performance and efficiency of the electric oil pump.

[0029] 4. Such an extremely simple and highly integrated structure can effectively avoid the changes in the pump body end face clearance and radial clearance with temperature caused by different thermal expansion coefficients of different components (such as the housing, shaft, and pump gear), which is very beneficial to improving the precision structure of the electric oil pump.

[0030] 5. This highly integrated structural design with an extremely simple structure eliminates multiple components, saves material costs, simplifies production and assembly costs, and thus saves the cost of the oil pump. At the same time, this extremely simple structural design can effectively reduce the vibration and noise during the operation of the pump, improve the NVH performance of the electric oil pump, and thus greatly improve the reliability and service life of the oil pump.

[0031] 6. There are two oil inlets in this design. The lower oil inlet is similar to that of a conventional electric oil pump and is located at the bottom of the pump housing. The other upper oil inlet is located on the upper cover. Through cooperation with the hollow shaft, this double oil inlet can achieve the function of oil circulation. When the oil is absorbed by the lower oil inlet, under the pressure environment formed by the rotation of the eccentric structure of the inner and outer gears, a part of the oil directly flows into the upper oil inlet along the hollow shaft. From the upper oil inlet, with the oil cavity formed by the eccentric structure design of the inner and outer rotors, the pressure gradually increases and then decreases, causing the oil to flow into or out of the cavity in a cyclic manner, taking away the heat generated in the motor and pump body with the oil circulation and flowing out from the oil outlet. The design of the double oil inlet accelerates the oil circulation, significantly improves the oil circulation efficiency, and further improves the cooling efficiency and lubrication efficiency of the electric oil pump in application. Brief Description of the Drawings

[0032] Figure 1 is a schematic view of the external structure of the first embodiment of the integrated electronic oil pump of the present application;

[0033] Figure 2 is a schematic perspective sectional view of the first embodiment of the integrated electronic oil pump of the present application;

[0034] Figure 3 is a sectional view of the internal top-down structure of the first embodiment of the integrated electronic oil pump of the present application;

[0035] Figure 4 is a schematic view of the internal bottom-up structure of the first embodiment of the integrated electronic oil pump of the present application;

[0036] Figure 5 is a schematic view of the structure of the bottom of the pump housing of the first embodiment of the integrated electronic oil pump of the present application;

[0037] Figure 6 is a schematic perspective sectional view of the second embodiment of the integrated electronic oil pump of the present application;

[0038] Figure 7 is a schematic view of the internal bottom-up structure of the third embodiment of the integrated electronic oil pump of the present application;

[0039] Figure 8 is a schematic view of the mating structure of the eccentric calibration member of the third embodiment of the integrated electronic oil pump of the present application;

[0040] Figure 9 is a schematic exploded view of the assembly part of the fixed shaft and the internal gear of the third embodiment of the integrated electronic oil pump of the present application.

[0041] Description of the Reference Numerals:

[0042] 1. Pump housing; 11. Oil inlet hole; 12. Oil outlet hole; 13. Bottom of the pump housing; 131. Fixing hole; 132. Oil swallowing port; 133. Oil spitting port; 134. Partition part; 135. Assembly guiding hole; 14. Filter screen; 15. Machine housing; 16. Air gap; 2. Fixed shaft; 21. Flow channel; 22. Sleeve; 23. Eccentric calibration member; 231. Positioning hole; 3. Internal gear; 4. External gear; 41. Oil swallowing and spitting cavity; 5. Motor rotor; 6. Motor stator; 61. Stator winding; 7. Circuit control module; 71. Controller; 72. Hub; 8. Upper cover; 81. Through hole; 82. Sensor; 9. Ball bearing. Detailed Description of the Embodiments

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Components of the embodiments of the present invention described and illustrated in the drawings here are usually arranged and designed in various different configurations. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0044] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0047] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The features in the following embodiments can be combined with each other without conflict.

[0048] Embodiment 1

[0049] Please refer to Figures 1 - 5 , which discloses an integrated electronic oil pump.

[0050] Please refer to Figure 1 , the integrated electronic oil pump includes a pump housing 1, an oil inlet hole 11, and an oil outlet hole 12.

[0051] Please refer to Figure 2, a circuit control module 7, a fixed shaft 2, an internal gear 3, an external gear 4, a motor rotor 5 and a motor stator 6 are arranged inside the pump housing 1. The pump housing 1 is provided with a fixing hole 131, and the fixed shaft 2 is arranged inside the fixing hole 131. A flow channel 21 for cooling oil to pass through is arranged inside the fixed shaft 2. The internal gear 3 is eccentric with the fixed shaft 2 and is rotationally connected thereto. A shaft sleeve 22 is connected between the fixed shaft 2 and the internal gear 3 to reduce the rotational resistance and improve the working stability. The external gear 4 is coaxially connected to the fixed shaft 2 and is rotationally connected inside the pump housing 1. The external gear 4 is located on the outer periphery of the internal gear 3 and meshes with the internal gear 3. One end of the flow channel 21 is communicated with an oil inlet hole 11, and the cooling oil can realize internal circulation through the flow channel 21. The motor rotor 5 is fixedly connected to the outer periphery of the external gear 4, the motor stator 6 is located on the outer periphery of the rotor and is fixedly connected to the pump housing 1, and an air gap 16 is left between the motor rotor 5 and the electronic stator.

[0052] One end of the oil inlet hole 11 is connected with a filter net 14 for filtering the cooling oil. The cooling oil enters the oil suction and discharge cavity 41 between the internal gear 3 and the external gear 4 from the oil suction port 132 through the filter net 14, and then is discharged from the oil outlet hole 12 at the bottom of the pump housing 1.

[0053] The circuit control module 7 includes: a hub 72 arranged inside the pump housing 1 and above the motor, and a controller 71 located above the hub 72. The function of the hub 72 is to collect the incoming and outgoing wires of the stator winding 61, making the wire heads neatly and clearly distributed, and welding the wire heads on the hub 72, with simple and neat technology. Another function of the hub 72 is to separate the controller 71 and the motor part, so that the oil fluid only circulates in the motor part, forming a cooling and lubricating circuit, and preventing the oil fluid from entering the controller 71.

[0054] A hub 72 is arranged above the stator assembly. The pins of the stator winding 61 pass through the hub 72, simplifying the design of the electric control component and the traditional winding structure.

[0055] The controller 71 can achieve fast response, and has the characteristics of reverse circuit connection protection, prevention of signal interference, monitoring of oil temperature, prevention of overheating, having an independent communication channel, detecting the angular position of the motor, receiving and calculating the motor speed comparison, and adjusting the rationality of the actual rotor speed.

[0056] Since the external gear is integrated into the motor rotor, the thermal expansion coefficients of the motor stator 6 and the pump body are the same, greatly reducing the influence of temperature on the oil pump clearance, accurately ensuring the pump end face clearance, and effectively reducing or avoiding the influence of temperature on the system flow efficiency.

[0057] During operation, the circuit control module 7 controls multiple stator windings 61 to be energized, and the generated magnetic field interacts with the permanent magnetic field of the magnet of the motor rotor 5 to drive the motor rotor 5 to rotate. The motor rotor 5 is fixed to the external gear 4, that is, the interaction between the motor stator 6 and the magnet of the motor rotor 5 drives the external gear 4 to rotate, and the external gear 4 further drives the internal gear 3 to rotate, realizing the relative rotation between the internal gear 3 and the external gear 4.

[0058] The pump housing 1 is provided with a housing 15 for separating the controller 71 and the hub 72. The housing 15 can separate the oil circuit and the electronic control part, improve the sealing performance, and ensure that the controller 71 works at an appropriate temperature. A PTC temperature sensor 82 for detecting and feedbacking the temperature of the cooling oil is installed on the housing 15, and the PTC temperature sensor 82 is electrically connected to the controller 71. In this embodiment, the PTC temperature sensor 82 can achieve the detection of the oil temperature accurate to 0.1 °C.

[0059] Particularly, on the plane passing through the axis of the fixed shaft 2, the projection areas of the motor stator 6, the motor rotor, the external gear 4, the internal gear 3 and the fixed shaft 2 at least partially overlap. Therefore, the technical solution of the present application is different from the series structure of the motor and the pump in the traditional electronic oil pump. The technical solution of the present application is more compact in structure, has a shorter oil circuit and higher efficiency, and has greatly improved in terms of installation convenience, working reliability and working efficiency.

[0060] Please refer to Figure 3 and Figure 4 , the motor stator 6 is provided with a plurality of stator windings 61 along its circumferential direction. The motor rotor 5 is sleeved on the outer circumferential circle of the external gear 4, and the outer circumferential wall of the motor rotor 5 corresponds to the inner circumferential wall of the motor stator 6. An upper cover 8 is also connected to the fixed shaft 2. Both ends of the internal gear 3 and both ends of the external gear 4 are respectively connected to the upper cover 8 and the pump housing 1 and jointly enclose a plurality of oil intake and discharge cavities 41. The volume of the oil intake and discharge cavities 41 first gradually increases and then gradually decreases along the rotation direction of the external gear 4. A through hole 81 communicating with the oil intake and discharge cavities 41 is opened on the upper cover 8. The flow channel 21 can introduce the cooling oil from the oil inlet hole 11 into the oil intake and discharge cavities 41 between the internal gear 3 and the external gear 4 through the through hole 81, thereby improving the cooling and lubrication efficiency. The flow channel 21 can also introduce the cooling oil from the oil inlet hole 11 into components such as the motor stator 6 and the motor rotor 5 for cooling, realizing internal multiple circulation and improving the cooling efficiency.

[0061] Please refer to Figure 4 and Figure 5, an oil inlet hole 11 is integrally formed at the bottom of the pump housing 1, and an oil outlet hole 12 is integrally formed on the circumferential outer wall of the pump housing 1. The bottom of the pump housing 1 is integrally formed with the bottom of the pump housing 1 covering the oil inlet hole 11 and the oil outlet hole 12. An axial fixing hole 131 fixedly connected to one end of the fixed shaft 2 is axially formed on the end face of the bottom of the pump housing 1. The fixed shaft 2 is inserted into the fixing hole 131, and the circumferential outer wall of the fixed shaft 2 is in tight fit with the hole wall of the fixing hole 131. An oil swallowing port 132 communicating with the oil inlet hole 11 and an oil discharging port 133 communicating with the oil outlet hole 12 are formed on the end face of the bottom of the pump housing 1. After the oil swallowing port 132 and the oil discharging port 133 are formed on the bottom of the pump housing 1, a partition portion 134 for separating the oil swallowing port 132 and the oil discharging port 133 is formed. One side of the partition portion 134 is attached to one side of the internal gear 3 to improve the sealing performance between the oil swallowing port 132 and the oil discharging port 133.

[0062] When the oil suction and discharge cavity 41 gradually increases, a negative pressure is formed. The oil suction and discharge cavity 41 corresponds to the oil inlet hole 11, and the cooling oil flows into the oil suction and discharge cavity 41 through the oil inlet hole 11; when the oil suction and discharge cavity 41 gradually decreases, the pressure increases, the oil suction and discharge cavity 41 corresponds to the oil outlet hole 12, and the cooling oil in the oil suction and discharge cavity 41 is pressurized and discharged from the oil outlet hole 12.

[0063] The mechanism of the cooling oil for cooling the stator assembly in this embodiment is as follows:

[0064] The motor rotor 5 and the external gear 4 jointly drive the internal gear 3 to rotate to pressurize the cooling oil flowing in from the oil inlet hole 11, so that a path of pressurized cooling oil flows through the hollow flow channel 21 of the fixed shaft 2 to the stator assembly to cool the stator assembly, and the cooled cooling oil after heat exchange flows back to the low-pressure area.

[0065] In addition, another path of pressurized cooling oil is directly discharged from the oil outlet hole 12 through the high-pressure area.

[0066] The specific process of cooling the stator assembly by the present invention is as follows:

[0067] 1) First, connect the device to the power supply. At this time, the controller 71 is powered on. The controller 71 converts the electricity into three-phase electricity to supply power to the stator winding 61. The electromagnetic force drives the motor rotor 5 and the external gear 4 to rotate. The rotation of the motor rotor 5 and the external gear 4 causes the cooling oil flowing in from the oil inlet hole 11 to enter the low-pressure area after passing through the filter screen 14;

[0068] 2) The motor rotor 5 and the external gear 4 jointly drive the internal gear 3 to rotate around the fixed shaft 2 to pressurize the cooling oil flowing in from the oil inlet hole 11, so that a path of pressurized cooling oil flows through the fixed shaft 2 to the stator assembly to cool the stator assembly. The cooling oil that has undergone heat exchange then flows back to the low-pressure area, and the pressure difference caused by the eccentricity difference between the internal gear 3 and the external gear 4 is used to pressurize the cooling oil. At this time, the PTC temperature sensor 82 feeds back the current temperature value of the oil and feeds this temperature value back to the controller 71, and the controller 71 feeds back the current oil temperature value to the external control system;

[0069] 3) Another path of pressurized cooling oil is directly discharged from the oil outlet hole 12 after passing through the high-pressure area.

[0070] Since the height of the entire electric oil pump is reduced, compared with the traditional electric oil pump, in this embodiment, the time for the pressurized cooling oil to flow to the stator assembly is short, and the cooling effect is better. In this embodiment, the motor stator 6 is made of silicon steel sheet material to reduce the manufacturing cost and the friction of the rotating parts; the wire diameter of the stator winding 61 is 1.8 mm, and compared with the traditional 1.6 mm, the performance of the rotor pump is greatly improved.

[0071] An O-ring seal is also provided on the outer periphery of the pump housing 1. In this embodiment, the material of the O-ring seal is rubber. The O-ring seal is used for horizontal and axial deformation, which is beneficial to sealing, reducing oil leakage and forming high pressure, is economical and efficient, is easy to assemble, has a long service life, and is convenient for maintenance.

[0072] Embodiment Two

[0073] Please refer to Figure 6 , the difference between this embodiment and Embodiment One is that a ball bearing 9 is provided between the external gear 4 and the pump housing 1 to improve the smoothness of the rotation of the external gear 4. For the cold start of the high-power electric oil pump, a sensor 82 is also fixedly connected to the top of the upper cover 8 fixedly connected to the external gear 4 in this embodiment. In this embodiment, the sensor 82 is a magnetic mutual inductor. In other specific applications, the sensor 82 can also be fixedly connected to the top of the fixed shaft 2.

[0074] Compared with the traditional electric oil pump where the motor rotor 5 is pressed into the ball bearing 9 bracket, and then the ball bearing 9 and the pump gear are pressed in, in this application, the ball bearing 9 bracket is not provided. On the one hand, the overall height of the electric oil pump is shortened, so that the path of the cooling oil flowing to the stator assembly for pressurization is short and the time used is less, and the cooling effect is better; on the other hand, the cumulative installation error is avoided, and there will be no hidden danger of air gap eccentricity.

[0075] Embodiment Three

[0076] Please refer to Figures 7 - 9, which is different from the first and second embodiments in that an eccentric calibration member 23 for realizing the eccentricity between the fixed shaft 2 and the internal gear 3 is provided between the fixed shaft 2 and the internal gear 3. The eccentric calibration member 23 in this embodiment is a half-moon sleeve, and the accurate eccentric positioning of the internal gear 3 relative to the fixed shaft 2 can be realized through the half-moon sleeve. A shaft sleeve 22 is provided between the fixed shaft 2 and the internal gear 3 to reduce the sliding friction force.

[0077] A positioning hole 231 is formed through one side of the half-moon sleeve, and an assembly guiding hole 135 corresponding to the positioning hole 231 is formed at the bottom of the pump housing 1. The assembly guiding hole 135 and the fixing hole 131 (refer to Figure 5 ) are eccentrically arranged, so that while the external gear 4 is rotatably connected to the fixed shaft 2, the half-moon sleeve can also be rotatably connected to the internal gear 3, realizing the coaxial and eccentric rotation effect of the internal gear 3 and the external gear 4. During the relative rotation of the internal gear 3 and the external gear 4, the volumes of a plurality of oil intake and discharge cavities 41 between the internal gear 3 and the external gear 4 change, and the volume change brings about a pressure change, thereby realizing the circulation of the cooling oil.

[0078] Embodiment Four

[0079] This embodiment discloses a working method of an electronic oil pump, which is applicable to the electronic oil pump in the above embodiments, and includes the following steps:

[0080] The motor rotor 5 and the external gear 4 rotate, thereby driving the internal gear 3 to rotate;

[0081] The internal gear 3 and the external gear 4 pressurize the cooling oil;

[0082] One part of the pressurized cooling oil flows through the flow channel 21 to the motor stator 6, and the other part of the pressurized cooling oil is discharged outside the pump housing 1.

[0083] Embodiment Five

[0084] This embodiment discloses another working method of an electronic oil pump, which is applicable to the electronic oil pump in the first to third embodiments, and includes the following steps:

[0085] The motor rotor 5 and the external gear 4 rotate, thereby driving the internal gear 3 to rotate;

[0086] The internal gear 3 and the external gear 4 perform cyclic pressurization and depressurization on the cooling oil in the oil intake and discharge cavity 41;

[0087] As the pressure of the cooling oil increases or decreases, a part of the cooling oil in the oil intake and discharge cavity 41 enters the flow channel 21 through the through hole 81 or the cooling oil enters the oil intake and discharge cavity 41 from the flow channel 21 through the through hole 81, and the heat in the pump housing 1 is taken away by the circulating cooling oil;

[0088] Another part of the cooling oil in the oil intake and discharge cavity 41 is discharged from the oil outlet hole 12.

[0089] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes, modifications, substitutions and variations, and these changes, modifications, substitutions and variations all fall within the scope of the present invention claimed.

Claims

1. An integrated electronic oil pump, comprising a pump housing (1), an oil inlet hole (11) and an oil outlet hole (12), characterized in that, Further comprising: A fixed shaft (2) is arranged inside the pump housing (1), and a flow channel (21) for cooling oil to pass through is provided inside the fixed shaft (2); An internal gear (3) is eccentrically and rotatably connected to the fixed shaft (2); An external gear (4) is coaxially connected to the fixed shaft (2) and rotatably connected inside the pump housing (1). The external gear (4) is located on the outer periphery of the internal gear (3) and meshes with the internal gear (3); A motor rotor (5) is fixedly connected to the outer periphery of the external gear (4); A motor stator (6) is located on the outer periphery of the rotor and fixedly connected to the pump housing (1); Wherein, one end of the flow channel (21) is communicated with the oil inlet hole (11), and the cooling oil can realize internal circulation through the flow channel (21).

2. The integrated electronic oil pump according to claim 1, wherein, On a plane passing through the axis of the fixed shaft (2), the projection areas of the motor stator (6), the motor rotor (5), the external gear (4), the internal gear (3) and the fixed shaft (2) at least partially overlap.

3. The integrated electronic oil pump according to claim 1 or 2, characterized in that, The external gear (4) is connected to the pump housing (1) through a bearing.

4. The integrated electronic oil pump according to claim 1 or 2, characterized in that, Further comprising an upper cover (8). Both ends of the internal gear (3) and both ends of the external gear (4) are respectively connected to the upper cover (8) and the pump housing (1) and jointly enclose a suction and discharge oil cavity (41).

5. The integrated electronic oil pump according to claim 4, characterized in that, The upper cover (8) is provided with a through hole (81). The flow channel (21) is communicated with the suction and discharge oil cavity (41) through the through hole (81), and the cross-sectional area of the through hole (81) gradually increases or gradually decreases in the circumferential direction of the upper cover (8).

6. The integrated electronic oil pump according to claim 5, characterized in that, A plurality of suction and discharge oil cavities (41) are enclosed between the external gear (4) and the internal gear (3). The volume of the suction and discharge oil cavity (41) first increases step by step and then decreases step by step along the rotation direction of the external gear (4). The pump housing (1) is provided with an oil inlet hole (11) and an oil outlet hole (12). When the suction and discharge oil cavity (41) increases step by step, the oil inlet of the suction and discharge oil cavity (41) corresponds to the oil inlet hole (11). When the suction and discharge oil cavity (41) decreases step by step, the oil outlet of the suction and discharge oil cavity (41) corresponds to the oil outlet hole (12).

7. The integrated electronic oil pump according to claim 6, characterized in that, When the suction and discharge oil cavity (41) increases step by step, the cooling oil flows into the suction and discharge oil cavity (41) through the oil inlet hole (11). When the suction and discharge oil cavity (41) decreases step by step, the cooling oil in the suction and discharge oil cavity (41) is pressurized and discharged from the oil outlet hole (12).

8. The integrated electronic oil pump according to claim 6, wherein, The flow channel (21) is communicated with the oil inlet hole (11). When the suction and discharge oil cavity (41) increases step by step, the cooling oil flows into the suction and discharge oil cavity (41) through the flow channel (21) and the through hole (81). When the suction and discharge oil cavity (41) decreases step by step, the cooling oil in the suction and discharge oil cavity (41) is pressurized and flows into the flow channel (21) through the through hole (81).

9. The integrated electronic oil pump according to claim 6, characterized in that, An air gap (16) is left between the motor rotor (5) and the motor stator (6).

10. The integrated electronic oil pump according to claim 6, characterized in that, The pump housing (1) is provided with a temperature sensor (82) for detecting and feedback the temperature of the cooling oil.

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