Integrated electronic oil pump and its operation method

Abstract

To provide an electronic oil pump capable of improving the cooling efficiency and lubricating efficiency.SOLUTION: The electronic oil pump includes a fixed shaft in which a flow path is provided for cooling oil to pass therethrough, an internal gear eccentric to the fixed shaft and turnably connected thereto, an external gear coaxially connected to the fixed shaft, turnably connected into a pump casing, and located on the outer periphery of the internal gear for engaging with the internal gear, a motor rotor connected to the outer periphery of the external gear in a fixed manner, and a motor stator located on the outer periphery of the rotor and connected to the pump casing in a fixed manner. The flow path has one end communicated with an oil supply hole so that the cooling oil actualizes internal circulation via the flow path.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present application relates to the technical field of new energy automobile electronic oil pumps, and in particular to an integrated electronic oil pump and its operating method. [Background technology]

[0002] With the rapid development of automotive electronics and new energy vehicles, the integrated and precisely designed electronic oil pump has been widely applied due to its characteristics of high efficiency, energy saving and flexible control.

[0003] Currently, an electronic oil pump is mainly composed of three parts, including a rotor pump, a motor, and a controller. The controller controls the operation of the motor, which then drives the rotation of the rotor pump to realize the operation of the electronic oil pump.

[0004] However, the conventional electronic oil pump has the disadvantages of a complicated structure and low cooling oil circulation efficiency, so there is room for improvement. Summary of the Invention

[0005] In view of the above, an objective of the present application is to provide an integrated electronic oil pump and an operating method thereof, which has the advantages of simple design, compact structure, high operating efficiency, etc.

[0006] In a first aspect, the present application provides an integrated electronic oil pump having a pump casing, an oil supply hole and an oil drain hole, the integrated electronic oil pump further comprising: a fixed shaft provided in the pump casing, the fixed shaft having a flow path therein through which cooling oil passes; an internal gear eccentrically connected to the fixed shaft and rotatably connected; an external gear coaxially connected to the fixed shaft and rotatably connected within the pump casing, the external gear being located on the outer periphery of the internal gear and meshing with the internal gear; a motor rotor fixedly connected to the outer periphery of the external gear; and a motor stator being located on the outer periphery of the rotor and fixedly connected to the pump casing, the flow path having one end communicating with the oil supply hole, and the cooling oil realizing internal circulation via the flow path.

[0007] By using the above technical solution, an external gear is provided inside the motor rotor, and the external gear is integrated and integrated with the motor rotor, making the structure simpler and more compact. The flow in the fixed shaft can cool the fixed shaft when the cooling oil passes through it, and at the same time, the cooling oil communicates with the upper and lower spaces of the electronic oil pump through the flow path, and the cooling oil flows in from the bottom of the flow path to cool the internal gear, external gear, motor rotor and motor stator, improving the circulation efficiency of the cooling oil.

[0008] In some embodiments of the first aspect, in a plane passing through an axis of the fixed shaft, projected areas of the motor stator, the motor rotor, the external gear, the internal gear and the fixed shaft at least partially overlap.

[0009] The above technical proposal has the following technical effects. First, the height of the electronic oil pump is reduced, the system volume is greatly reduced, the system weight is reduced, and the system material and production costs are significantly reduced. Second, the height of the oil pump is reduced, the path of the pressurized cooling oil is shortened, and the friction of the rotor pump chamber is effectively reduced, which is favorable to improving the system efficiency. Third, the structure is simple, the accumulated installation error is reduced, the coaxiality of the motor rotor, the motor stator and the external gear is improved, and the risk of eccentricity of the air gap is avoided. Fourth, the structure is more stable, which effectively reduces the vibration noise during the operation of the pump body, improves the performance of the pump body, improves the reliability of the pump body, and extends the working life of the pump body. Fifth, this minimalist structural design effectively reduces the pump-like working vibration and noise, improves the NVH performance of the electronic oil pump, and thus improves the reliability and service life of the oil pump.

[0010] In some embodiments of the first aspect, the electronic oil pump further comprises a bearing, one end of the fixed shaft is fixedly connected to the pump casing, and the fixed shaft is connected to the internal gear via a bearing.

[0011] By using the above technical solution, a bearing is provided between the fixed shaft and the internal gear, which allows the internal gear to rotate more smoothly relative to the fixed shaft, while at the same time improving the accuracy and reliability of the assembly position between the internal gear and the fixed shaft.

[0012] In certain embodiments of the first aspect, the external gear is connected to the pump casing via a bearing.

[0013] By using the above technical solution, the stability of the external gear during rotation can be improved, the end face clearance, the radial clearance and the air gap of the motor of the electronic oil pump can be effectively improved, and the performance and efficiency of the electronic oil pump can be obviously improved.

[0014] In some embodiments of the first aspect, the electronic oil pump further comprises a top cover, and both ends of the internal gear and both ends of the external gear are connected to the top cover and the pump casing, respectively, and together enclosed form a huff-and-puff oil chamber.

[0015] In some embodiments of the first aspect, the top cover has a through hole, and the flow passage communicates with the huff-and-puff oil chamber via the through hole.

[0016] By using the above technical solution, the internal gear and the external gear rotate relative to each other to circulate the cooling oil in the huff-and-puff oil chamber, and the flow passage communicates with the huff-and-puff oil chamber through the through hole, so that the cooling oil repeatedly flows into and out of the huff-and-puff oil chamber. This solution can improve the circulation efficiency of the cooling oil, and further improve the cooling efficiency and lubrication efficiency of the electronic oil pump.

[0017] In some embodiments of the first aspect, the external gear and the internal gear surround a plurality of huff-and-puff oil chambers, the volumes of the huff-and-puff oil chambers first increase stepwise along the rotation direction of the external gear and then decrease stepwise, the pump casing is provided with an oil inlet and an oil drain hole, when the huff-and-puff oil chambers increase stepwise, the oil inlet of the huff-and-puff oil chambers corresponds to the oil inlet hole, and when the huff-and-puff oil chambers decrease stepwise, the oil drain port of the huff-and-puff oil chambers corresponds to the oil drain hole.

[0018] In some embodiments of the first aspect, when the huff-and-puff oil chamber gradually increases, cooling oil flows into the huff-and-puff oil chamber through the oil supply hole, and when the huff-and-puff oil chamber gradually decreases, the cooling oil in the huff-and-puff oil chamber is pressurized and discharged through the oil drain hole.

[0019] In some embodiments of the first aspect, the flow path is connected to the oil supply hole, and when the huff-and-puff oil chamber increases gradually, cooling oil flows into the huff-and-puff oil chamber through the flow path and the through hole, and when the huff-and-puff oil chamber decreases gradually, the cooling oil in the huff-and-puff oil chamber is pressurized and flows into the flow path from the through hole.

[0020] By using the above technical solution, after the oil is sucked in by the oil inlet, in the pressure environment formed by the rotation of the eccentric structure of the internal and external gears, a part of the oil flows directly into the through hole along the flow path, and in the through hole, along with the huff and puff oil chamber formed by the design of the eccentric structure of the gears and the external gears, the pressure increases stepwise and then decreases stepwise, so that the cooling oil repeatedly flows into and out of the huff and puff oil chamber, and the heat generated in the motor and pump body is carried away with the circulation of the cooling oil and flows out of the oil drain hole. The design of the double oil inlet accelerates the circulation of the oil, significantly improves the circulation efficiency of the oil, and further improves the cooling efficiency and lubrication efficiency during the application of the electronic oil pump.

[0021] In a second aspect, the present application provides a method for producing a method for manufacturing a semiconductor device comprising: driving the motor rotor and the external gear to rotate, thereby rotating the internal gear; the internal gear and the external gear pressurizing cooling oil; The pressurized cooling oil flows through a flow path to the motor stator on one side, and the pressurized cooling oil is discharged to the outside of the pump casing on the other side.

[0022] In a third aspect, the present application provides a method for producing a method for manufacturing a semiconductor device comprising: driving the motor rotor and the external gear to rotate, thereby rotating the internal gear; The internal gear and the external gear pressurize and depressurize the cooling oil in a huff and puff oil chamber; As the pressure of the cooling oil increases or decreases, a portion of the cooling oil in the huff-and-puff oil chamber enters the flow passage through the through hole, or the cooling oil enters the huff-and-puff oil chamber from the flow passage through the through hole, and heat in the pump casing is carried away by the circulation of the cooling oil; There is provided another method of operating an integrated electronic oil pump applicable to the integrated electronic oil pump according to the first aspect, comprising: a step of discharging another portion of the cooling oil in the huff-and-puff oil chamber through an oil drain hole.

[0023] By using the above technical solution, the dual oil circuit design can realize the function of the pump while cooling itself, improving efficiency and service life.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. Reduce the height of the electronic oil pump, reduce the system volume, reduce the weight, and reduce the cost. Simple structure, high assembly precision, high operating efficiency, and extend the operating life of the product. The electronic oil pump of the present application has a small aspect ratio, the structure of the pump body is more stable, and the impact of thermal expansion of different materials due to temperature on the axial and radial end surface gaps of the pump body is reduced, improving the efficiency of the electronic oil pump. The operating method of the electronic oil pump of the present application realizes the function of the pump while cooling itself, improving the efficiency and life.

[0026] 2. The electronic oil pump of this application does not have a bearing or nut, does not use an eccentric calibration piece, the top of the shaft is directly inserted and fixed into the top cover, and the bottom of the shaft is directly inserted into the bottom of the pump chassis, without connecting or fixing other components. This minimalist and highly integrated structure avoids the processing errors of multiple processed parts and effectively reduces the total tolerance generated during the assembly of multiple parts, thus effectively improving the precision of the electronic oil pump and improving the operating efficiency of the electronic oil pump.

[0027] 3. This minimalist and highly integrated structural design highly and compactly connects the chassis, shaft and pump gear together, effectively improving the end face clearance, radial clearance and motor air gap of the electronic oil pump, and further significantly improving the performance and efficiency of the electronic oil pump.

[0028] 4. This minimalist and highly integrated structure effectively avoids the end face gaps and radial gaps of the pump body that change with temperature due to the different material temperature thermal expansion coefficients of different components (such as the chassis, shaft, and pump gear), which is very beneficial for improving the precision structure of the electronic oil pump.

[0029] 5. The minimalist and highly integrated structure design saves multiple parts, reduces material costs, simplifies production and assembly costs, and thus reduces the cost of the oil pump. At the same time, the minimalist structure design effectively reduces the vibration and noise generated during pump operation, improves the NVH performance of the electronic oil pump, and greatly improves the reliability and service life of the oil pump.

[0030] 6. In this design, there are two oil inlets, the lower oil inlet is similar to the general electronic oil pump and is located at the bottom of the pump chassis, and the other upper oil inlet is located on the top cover. Through the cooperation with the hollow shaft, such a double oil inlet can realize the function of oil circulation. After the oil is sucked by the lower oil inlet, in the pressure environment formed by the rotation of the eccentric structure of the internal and external gears, a part of the oil flows directly into the upper oil inlet along the hollow shaft. At the upper oil inlet, with the oil cavity formed by the design of the eccentric structure of the internal and external rotors, the pressure increases stepwise and then decreases stepwise, so that the oil repeatedly flows into and out of the cavity, and the heat generated in the motor and pump body is carried away with the oil circulation and discharged from the oil drain. 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 during the application of the electronic oil pump. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a schematic diagram of the external structure of a first embodiment of the integrated electronic oil pump of the present application. [Diagram 2] FIG. 2 is a perspective cross-sectional schematic view of a first embodiment of the integrated electronic oil pump of the present application. [Diagram 3] FIG. 3 is a cross-sectional view of the internal plan structure of a first embodiment of the integrated electronic oil pump of the present application. [Figure 4] FIG. 4 is a schematic diagram of the internal bottom structure of the first embodiment of the integrated electronic oil pump of the present application. [Diagram 5] FIG. 5 is a structural schematic diagram of the bottom of the pump casing of the first embodiment of the integrated electronic oil pump of the present application. [Figure 6] FIG. 6 is a perspective sectional structural schematic diagram of a second embodiment of the integrated electronic oil pump of the present application. [Figure 7] FIG. 7 is a schematic diagram of the internal bottom structure of the third embodiment of the integrated electronic oil pump of the present application. [Figure 8] FIG. 8 is a schematic diagram of the fitting structure of the eccentricity calibration piece of the integrated electronic oil pump according to the third embodiment of the present application. [Figure 9] FIG. 9 is a partial exploded assembly structure schematic diagram of a fixed shaft and an internal gear of the integrated electronic oil pump according to the third embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in more detail below with reference to the drawings. In general, the assemblies of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Based on the embodiments of the present invention, any other embodiments that a person skilled in the art can obtain without any creative work are within the scope of protection of the present invention.

[0033] It should be noted that in the following figures, like numerals and letters represent like items, so that once an item is defined in one figure, further definition and explanation is not required in the subsequent figures.

[0034] In the description of the present invention, it should be explained that unless there is a clear specification and limitation, the terms "attached", "connected", "connected" and the like should be broadly understood, for example, they may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or internal communication between two elements. Those skilled in the art may understand the specific meaning of the above terms in the present invention according to the specific situation.

[0035] In the description of this application, orientations or positional relationships indicated by technical terms such as "upper", "lower", "left", "right" and the like are based on those shown in the accompanying drawings and are merely intended to facilitate and simplify the description of this application, and do not indicate or suggest that the referred to devices or elements have a particular orientation or must be constructed and operated in a particular orientation, and therefore cannot be understood as limiting this application.

[0036] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. Where no contradiction exists, the features of the following embodiments can be combined with each other. Example 1

[0037] Referring to Figures 1 to 5, an integrated electronic oil pump is disclosed.

[0038] Referring to FIG. 1, the integrated electronic oil pump comprises a pump casing 1, an oil supply hole 11 and an oil drain hole 12.

[0039] Referring to FIG. 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 provided in a pump casing 1. A fixed hole 131 is provided in the pump casing 1, and the fixed shaft 2 is provided in the fixed hole 131. A flow path 21 through which cooling oil passes is provided in the fixed shaft 2, and the internal gear 3 is eccentrically connected to the fixed shaft 2 and rotatably connected, and a bushing 22 is connected between the fixed shaft 2 and the internal gear 3 to reduce rotation resistance and improve operation stability. The external gear 4 is coaxially connected to the fixed shaft 2 and rotatably connected in the pump casing 1, the external gear 4 is located on the outer periphery of the internal gear 3 and meshes with the internal gear 3, and one end of the flow path 21 is connected to the oil supply hole 11, and the cooling oil realizes internal circulation through the flow path 21. A motor rotor 5 is fixedly connected to the outer periphery of the external gear 4, and a motor stator 6 is located on the outer periphery of the rotor and fixedly connected to the pump casing 1, with an air gap 16 being maintained between the motor rotor 5 and the motor stator.

[0040] A filter 14 for filtering the cooling oil is connected to one end of the oil supply hole 11. The cooling oil passes through the filter 14 and enters the huff-and-puff oil chamber 41 between the internal gear 3 and the external gear 4 from the oil suction port 132, and is then discharged from the oil drain hole 12 at the bottom of the pump casing 1.

[0041] The circuit control module 7 is provided in the pump casing 1 and includes a hub 72 located above the motor, and a controller 71 located above the hub 72. The role of the hub 72 is to collect the input and output lines of the stator winding 61, make the distribution of the lint regular and clear, and weld the lint to the hub 72, which is a simple and concise process. Another role of the hub 92 is to separate the controller 71 from the motor part, so that the oil flows only through the motor part, and a cooling and lubrication circuit is formed, and the oil does not enter the controller 71.

[0042] Above the stator assembly is a hub 72. The pins of the stator windings 61 pass through the hub 72, simplifying the design of the electrical control assembly and simplifying conventional winding construction.

[0043] The controller 71 realizes fast response and has features such as circuit reverse connection protection, signal interference prevention, oil temperature monitoring, overheating prevention, independent communication channel, motor angle position detection, receiving and calculating motor rotation speed comparison, and comparing and adjusting the actual rotor rotation speed.

[0044] The external gear is integrated into the motor rotor, and the thermal expansion coefficients of the motor stator 6 and the pump body are the same, 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.

[0045] During operation, the circuit control module 7 controls the plurality of stator windings 61 to be energized, and the resulting magnetic field and the permanent magnetic field of the magnets of the motor rotor 5 interact with each other to drive the motor rotor 5 to rotate. The motor rotor 5 and the external gear 4 are fixed, i.e., the motor stator 6 and the magnets of the motor rotor 5 interact with each other to drive the external gear 4 to rotate, and the external gear 4 further drives the internal gear 3 to rotate, thereby realizing the relative rotation between the internal gear 3 and the external gear 4.

[0046] The pump casing 1 is provided with a chassis 15 for separating the controller 71 and the hub 72. The chassis 15 separates the oil passage and the electrical control section, improving the airtightness and ensuring that the controller 71 operates at an appropriate temperature. A PTC temperature sensor 82 (not shown) for detecting and feeding back the cooling oil temperature is attached to the chassis 15, and the PTC temperature sensor 82 is electrically connected to the controller 71. The PTC temperature sensor 82 in the present invention can accurately detect the oil temperature to within 0.1°C.

[0047] In particular, on a plane passing through the axis of the fixed shaft 2, the projected 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, unlike the serial connection structure of the motor and the pump in the conventional electronic oil pump, the technical solution of the present application is more compact in structure, has a shorter oil path, is more efficient, and is greatly improved in terms of installation simplicity, operating reliability and operating efficiency.

[0048] 3 and 4, the motor stator 6 is provided with a number of stator windings 61 in its circumferential direction, the motor rotor 5 is fitted around the circumferential outer circle of the external gear 4, and the circumferential outer wall of the motor rotor 5 corresponds to the circumferential inner wall of the motor stator 6. The fixed shaft 2 is further connected with a top cover 8, and both ends of the internal gear 3 and both ends of the external gear 4 are connected to the top cover 8 and the pump casing 1, respectively, and are surrounded together to form a huff-and-puff oil chamber 41, the volume of which increases stepwise along the rotation direction of the external gear 4 and then decreases stepwise. The top cover 8 is provided with a through hole 81 communicating with the huff-and-puff oil chamber 41, and the flow passage 21 can introduce the cooling oil from the oil supply hole 11 into the huff-and-puff oil chamber 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 passage 21 also introduces the cooling oil from the oil supply hole 11 into the motor stator 6, the motor rotor 5, and other components to cool them, thereby realizing multiple internal circulation and improving the cooling efficiency.

[0049] 4 and 5, an oil supply hole 11 is integrally formed in the bottom of the pump casing 1, and an oil drain hole 12 is integrally formed in the circumferential outer wall. The bottom of the pump casing 1 is integrally formed with the bottom of the pump casing 1, covering the oil supply hole 11 and the oil drain hole 12, and a fixing hole 131 is formed in the axial direction of the end face of the bottom of the pump casing 1, and is fixedly connected to one end of the fixed shaft 2. The fixed shaft 2 is inserted into the fixing hole 131, and the circumferential outer wall of the fixed shaft 2 and the hole wall of the fixing hole 131 are firmly fitted together. An oil suction port 132 communicating with the oil supply hole 11, and an oil drain port 133 communicating with the oil drain hole 12 are formed in the end face of the bottom of the pump casing 1. After the oil suction port 132 and the oil discharge port 133 are opened at the bottom of the pump casing 1, a partition portion 134 is formed to separate the oil suction port 132 and the oil discharge port 133. One side of the partition portion 134 is attached to one side of the internal gear 3 to improve the sealing between the oil suction port 132 and the oil discharge port 133.

[0050] When the huff and puff oil chamber 41 increases gradually, a negative pressure is formed, the huff and puff oil chamber 41 corresponds to the oil supply hole 11, and cooling oil flows into the huff and puff oil chamber 41 through the oil supply hole 11, and when the huff and puff oil chamber 41 decreases gradually, the pressure increases, the huff and puff oil chamber 41 corresponds to the oil drain hole 12, and the cooling oil in the huff and puff oil chamber 41 is pressurized and discharged from the oil drain hole 12.

[0051] The algorithm by which the cooling oil of the present invention cools the stator assembly is as follows:

[0052] The motor rotor 5 drives the internal gear 3 to rotate together with the external gear 4, thereby pressurizing the cooling oil flowing in from the oil supply hole 11, so that one of the pressurized cooling oils flows through the hollow passage 21 in the fixed shaft 2 to the stator assembly, cooling the stator assembly, and the heat-exchanged cooling oil flows back to the low-pressure area.

[0053] The other pressurized cooling oil is discharged directly from the oil drain hole 12 via the high pressure region.

[0054] In the present invention, the specific process of cooling the stator assembly is as follows.

[0055] 1) First, the equipment is turned on. At this time, the controller 71 is energized, the controller 71 converts the electricity into three-phase electricity and supplies it to the stator winding 61, the motor rotor 5 and the external gear 4 are rotated by electromagnetic force, and the cooling oil flowing in from the oil supply hole 11 due to the rotation of the motor rotor 5 and the external gear 4 passes through the filter 14 and then enters the low pressure area.

[0056] 2) The motor rotor 5 drives the internal gear 3 together with the external gear 4 to rotate around the fixed shaft 2, pressurizing the cooling oil flowing in from the oil supply hole 11, so that one pressurized cooling oil flows to the stator assembly via the fixed shaft 2 and cools the stator assembly, and the cooling oil that has been heat exchanged flows again to the low pressure area, and the cooling oil is pressurized by the pressure difference due to the eccentricity difference between the internal gear 3 and the external gear 4. In this case, the PTC temperature sensor 82 detects the current oil temperature value and feeds this temperature value back to the controller 71, which feeds back the current oil temperature value to an external control system.

[0057] 3) The other pressurized cooling oil passes through the high pressure region and is then discharged directly from the oil drain hole 12.

[0058] Since the overall height of the electronic oil pump is reduced, the time for pressurized cooling oil to flow to the stator assembly is shorter in this embodiment than in the conventional electronic oil pump, and the temperature reduction effect is better. In this embodiment, the motor stator 6 is manufactured using silicon steel plate material, which reduces the manufacturing cost and the frictional force of the rotating parts, and the wire diameter of the stator winding 61 is 1.8 mm, which is significantly improved in performance of the rotor pump compared to the conventional 1.6 mm.

[0059] An O-shaped seal ring is further provided on the outer periphery of the pump casing 1, and in this embodiment, the O-shaped seal ring is made of rubber. The O-shaped seal ring is used for horizontal and axial deformation, which is helpful for sealing, reducing oil leakage, and forming high pressure, and is economical and efficient, easy to assemble, has a long service life, and is easy to maintain. Example 2

[0060] 6, the present embodiment is different from the first embodiment in that a ball bearing 9 is provided between the external gear 4 and the pump casing 1 to improve the stability of the rotation of the external gear 4. For cold start of the high-power electronic oil pump, in this embodiment, a sensor 82 is fixedly connected to the top end of the top cover 8 which is fixedly connected to the external gear 4, and the sensor 82 in this embodiment is a magnetic inductor. In other specific applications, the sensor 82 may be fixedly connected to the top end of the fixed shaft 2.

[0061] Compared with the case where the motor rotor 5 of the conventional electronic oil pump is pressed into the ball bearing 9 bracket and then pressed into the ball bearing 9 and the pump gear, in the present application, the ball bearing 9 bracket is not installed, which on the one hand shortens the overall height of the electronic oil pump, shortens the path of the cooling oil flowing into the stator assembly and being pressurized, 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. Example 3

[0062] 7 to 9, the difference between Example 1 and Example 2 is that an eccentricity calibration piece 23 is provided between the fixed shaft 2 and the internal gear 3 to realize eccentricity of the internal gear 3 and the fixed shaft 2, and the eccentricity calibration piece 23 in this embodiment is a half-moon sleeve, which enables the internal gear 3 to realize accurate eccentric positioning with respect to the fixed shaft 2. A bushing 22 is provided between the fixed shaft 2 and the internal gear 3 to reduce sliding friction force.

[0063] A positioning hole 231 is drilled through one side of the semicircular sleeve, and an assembly guide hole 135 corresponding to the positioning hole 231 is drilled in the bottom of the pump casing 1, and the assembly guide hole 135 and the fixing hole 131 (see FIG. 5) are eccentrically arranged, so that the external gear 4 is rotatably connected to the fixed shaft 2, and at the same time, the semicircular sleeve is rotatably connected to the internal gear 3, so that the internal gear 3 and the external gear 4 can achieve a coaxial and eccentric rotation effect. In the process of the internal gear 3 and the external gear 4 rotating relative to each other, the volume of the multiple huff-and-puff oil chambers 41 between the internal gear 3 and the external gear 4 changes, causing a change in pressure due to the volume change, thereby realizing the circulation of the cooling oil. Example 4

[0064] In this embodiment, driving the internal gear 3 to rotate by rotating the motor rotor 5 and the external gear 4; the internal gear 3 and the external gear 4 pressurizing the cooling oil; The pressurized cooling oil flows through the flow path 21 to the motor stator 6 on one side, and the pressurized cooling oil is discharged to the outside of the pump casing 1 on the other side. Example 5

[0065] In this embodiment, driving the internal gear 3 to rotate by rotating the motor rotor 5 and the external gear 4; The internal gear 3 and the external gear 4 circulate the cooling oil in the huff and puff oil chamber 41 to increase and decrease the pressure; As the pressure of the cooling oil increases or decreases, a part of the cooling oil in the huff-and-puff oil chamber 41 enters the passage 21 through the through hole 81, or the cooling oil enters the huff-and-puff oil chamber 41 from the passage 21 through the through hole 81, and the heat in the pump casing 1 is carried away by the circulation of the cooling oil; Another operating method of the electronic oil pump applicable to the electronic oil pumps in the first to third embodiments is disclosed, which includes a step of discharging the other portion of the cooling oil in the huff-and-puff oil chamber 41 through the oil drain hole 12.

[0066] The above shows and describes 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 to the above-mentioned embodiments, and the contents described in the above-mentioned embodiments and the description are merely illustrative of the principles of the present invention. The present invention can be subject to various changes, modifications, substitutions and variations without departing from the spirit and scope of the present invention, and all such changes, modifications, substitutions and variations are included in the scope of the claims. [Explanation of symbols]

[0067] 1. Pump casing 11. Oil filler hole 12, oil drain hole 13. Bottom of pump casing 131, fixed hole 132, Oil intake port 133 - Oil outlet 134, partition 135, assembly guide hole 14. Filter 15. Chassis 16. Air gap 2. Fixed shaft 21. Flow path 22. Bushing 23. Eccentricity calibration piece 231, positioning hole 3. Internal gear 4. External gear 41. Huff and puff oil chamber 5. Motor rotor 6. Motor stator 61. Stator winding 7. Circuit control module 71, Controller 72, Hub 8, top lid 81, through hole 82, Sensor 9, ball bearing

Claims

1. An integrated electronic oil pump comprising a pump casing (1), an oil supply hole (11) and an oil drain hole (12), A fixed shaft (2) is provided in the pump casing (1), and has a flow passage (21) through which cooling oil passes; an internal gear (3) eccentrically connected to the fixed shaft (2) so as to be rotatable; an external gear (4) that is coaxially connected to the fixed shaft (2), rotatably connected within the pump casing (1), and located on the outer periphery of the internal gear (3) and meshes with the internal gear (3); a motor rotor (5) fixedly connected to the outer periphery of the external gear (4); a motor stator (6) located on the outer periphery of the rotor and fixedly connected to the pump casing (1); One end of the flow passage (21) is connected to the oil supply hole (11), and the cooling oil realizes internal circulation through the flow passage (21). An integrated electronic oil pump.

2. In a plane passing through the axis of the fixed shaft (2), the projected 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.

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

3. The external gear (4) is connected to the pump casing (1) via a bearing.

3. The integrated electronic oil pump according to claim 1 or 2.

4. The pump further includes a top cover (8), and both ends of the internal gear (3) and both ends of the external gear (4) are connected to the top cover (8) and the pump casing (1), respectively, and are surrounded by each other to form a huff-and-puff oil chamber (41).

3. The integrated electronic oil pump according to claim 1 or 2.

5. The upper cover (8) is provided with a through hole (81), and the flow path (21) communicates with the huff-and-puff oil chamber (41) via the through hole (81).

5. The integrated electronic oil pump according to claim 4.

6. A plurality of huff-and-puff oil chambers (41) are formed by being surrounded by the external gear (4) and the internal gear (3), the volume of the huff-and-puff oil chambers (41) first increases stepwise along the rotation direction of the external gear (4) and then decreases stepwise, the pump casing (1) is provided with an oil supply hole (11) and an oil drain hole (12), when the huff-and-puff oil chambers (41) increase stepwise, the oil supply port of the huff-and-puff oil chambers (41) corresponds to the oil supply hole (11), and when the huff-and-puff oil chambers (41) decrease stepwise, the oil drain port of the huff-and-puff oil chambers (41) corresponds to the oil drain hole (12).

6. The integrated electronic oil pump according to claim 5.

7. When the huff and puff oil chamber (41) increases in size, the cooling oil flows into the huff and puff oil chamber (41) through the oil supply hole (11), and when the huff and puff oil chamber (41) decreases in size, the cooling oil in the huff and puff oil chamber (41) is pressurized and discharged from the oil drain hole (12).

7. The integrated electronic oil pump according to claim 6.

8. The flow path (21) communicates with the oil supply hole (11), and when the huff-and-puff oil chamber (41) increases in size stepwise, the cooling oil flows into the huff-and-puff oil chamber (41) through the flow path (21) and the through hole (81), and when the huff-and-puff oil chamber (41) decreases in size stepwise, the cooling oil in the huff-and-puff oil chamber (41) is pressurized and flows into the flow path (21) through the through hole (81).

7. The integrated electronic oil pump according to claim 6.

9. A method for operating an integrated electronic oil pump, which is applied to the integrated electronic oil pump according to claim 1, comprising: driving the internal gear (3) to rotate by rotating the motor rotor (5) and the external gear (4); The internal gear (3) and the external gear (4) pressurize cooling oil; One of the pressurized cooling oil flows through a flow path (21) to the motor stator (6), and the other of the pressurized cooling oil is discharged to the outside of the pump casing (1).

2. A method for operating an integrated electronic oil pump comprising:

10. A method for operating an integrated electronic oil pump, which is applied to the integrated electronic oil pump according to any one of claims 6 to 8, comprising the steps of: driving the internal gear (3) to rotate by rotating the motor rotor (5) and the external gear (4); The internal gear (3) and the external gear (4) pressurize and depressurize the cooling oil in a huff and puff oil chamber (41); As the pressure of the cooling oil increases or decreases, a part of the cooling oil in the huff-and-puff oil chamber (41) enters the flow passage (21) through the through hole (81), or the cooling oil enters the huff-and-puff oil chamber (41) from the flow passage (21) through the through hole (81), and the heat in the pump casing (1) is carried away by the circulation of the cooling oil; and discharging the other portion of the cooling oil in the huff-and-puff oil chamber (41) through an oil drain hole (12).

2. A method for operating an integrated electronic oil pump comprising:

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