Integrated electronic oil pump and its operating 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] This application relates to the technical field of new energy vehicle electronic oil pumps, and particularly to an integrated electronic oil pump and its operating method.

Background Art

[0002] With the rapid development of automotive electronics and new energy vehicles, electronic oil pumps designed with integrated high precision are being more widely applied due to features such as high efficiency, energy saving, and flexible control.

[0003] Currently, an electronic oil pump is mainly composed of three parts: components such as a rotor pump, a motor, and a controller. The controller controls the operation of the motor, and further 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 drawbacks of complex structure and low circulation efficiency of the cooling oil, and there is room for certain improvement.

Summary of the Invention

[0005] In view of this, an object of this application is to provide an integrated electronic oil pump and its operating method. The electronic oil pump has advantages such as simple design, compact structure, and high operating efficiency.

[0006] In a first aspect, the present application provides an integrated electronic oil pump comprising a pump casing, an oil supply port and an oil discharge port, wherein the pump casing is provided with a fixed shaft having a passage 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, rotatably connected within the pump casing, located on the outer circumference of the internal gear and meshing with the internal gear, a motor rotor fixedly connected to the outer circumference of the external gear, and a motor stator located on the outer circumference of the rotor and fixedly connected to the pump casing, wherein one end of the passage communicates with the oil supply port and the cooling oil circulates internally through the passage.

[0007] By using the above-described technology, an external gear is provided inside the motor rotor, and the external gear is integrated with the motor rotor, resulting in a simpler and more compact structure. The flow within the fixed shaft allows the fixed shaft to be cooled as the cooling oil passes through it. At the same time, the cooling oil communicates the upper and lower spaces of the electronic oil pump through the flow path, allowing the cooling oil to flow in from below the flow path, cooling the internal gear, external gear, motor rotor, and motor stator, thereby improving the circulation efficiency of the cooling oil.

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

[0009] By employing the above technical proposal, the following technical effects can be achieved. Firstly, the height of the electronic oil pump is reduced, the system volume is significantly reduced, the system weight is reduced, and system material and production costs are significantly reduced. Secondly, the lower height of the oil pump shortens the path of pressurized coolant, effectively reduces friction in the rotor pump chamber, and is advantageous for improving system efficiency. Thirdly, the structure is simple, reduces accumulated mounting errors, improves the coaxiality of the motor rotor, motor stator and external gear, and avoids the risk of air gap eccentricity. Fourthly, the structure becomes more stable, effectively reduces vibration noise during operation of the pump body, improves the performance of the pump body, improves the reliability of the pump body, and extends the operating life of the pump body. Fifthly, this minimalist structural design effectively reduces pump operating 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 the bearing.

[0011] By using the above-described technology, a bearing is provided between the fixed shaft and the internal gear, allowing the internal gear to rotate more smoothly relative to the fixed shaft, while simultaneously improving the precision and reliability of the assembly position between the internal gear and the fixed shaft.

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

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

[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, enclosing a huff-and-puff oil chamber.

[0015] In some embodiments of the first aspect, the top cover is provided with through holes, and the flow path communicates with the huff-and-puff oil chamber through the through holes.

[0016] By using the above-described technology, the internal and external gears rotate relative to each other, circulating the cooling oil in the huff-and-puff oil chamber. The flow path communicates with the huff-and-puff oil chamber through a through-hole, causing the cooling oil to repeatedly flow in and out of the huff-and-puff oil chamber. This method improves the circulation efficiency of the cooling oil and further enhances the cooling 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 huff-and-puff oil chambers having a volume that first increases in stages along the rotational direction of the external gear and then decreases in stages. The pump casing is provided with an oil supply port and an oil drain port, the oil supply port of the huff-and-puff oil chambers corresponding to the oil supply port when the huff-and-puff oil chambers increase in stages, and the oil drain port of the huff-and-puff oil chambers corresponding to the oil drain port when the huff-and-puff oil chambers decrease in stages.

[0018] In some embodiments of the first aspect, when the huff-and-puff oil chamber is gradually enlarged, coolant flows into the huff-and-puff oil chamber through the oil supply hole, and when the huff-and-puff oil chamber is gradually reduced in size, the coolant 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 communicates with the oil supply hole, and when the huff-and-puff oil chamber is gradually enlarged, the coolant flows into the huff-and-puff oil chamber through the flow path and the through hole, and when the huff-and-puff oil chamber is gradually reduced, the coolant in the huff-and-puff oil chamber is pressurized and flows into the flow path through the through hole.

[0020] By using the above-described technology, after oil is drawn in through the oil supply port, a portion of the oil flows directly into the through-hole along the flow path in the pressure environment formed by the rotation of the eccentric structure of the internal and external gears. In the through-hole, the pressure gradually increases and then decreases in accordance with the huff-and-puff oil chamber formed by the design of the eccentric structure of the gears and external gears. Thus, the cooling oil repeatedly flows in and out of the huff-and-puff oil chamber, and the heat generated in the motor and pump body is carried away by the circulation of the cooling oil and discharged through the oil drain port. The dual oil supply port design accelerates oil circulation, significantly improves oil circulation efficiency, and further improves cooling and lubrication efficiency when the electronic oil pump is in use.

[0021] In the second aspect, this application is, The motor rotor and external gear rotate, thereby driving the internal gear to rotate. The internal gear and the external gear pressurize the cooling oil, A method for operating an integrated electronic oil pump is provided, applicable to an integrated electronic oil pump according to a first embodiment, comprising the steps of: one side of the pressurized coolant flows through a passage to the motor stator; and the other side of the pressurized coolant is discharged outside the pump casing.

[0022] In the third aspect, this application is, The motor rotor and external gear rotate, thereby driving the internal gear to rotate. The internal gear and the external gear are subjected to the step of circulating cooling oil within a huff-and-puff oil chamber to pressurize or depressurize them. As the pressure of the cooling oil increases or decreases, a part of the cooling oil in the half-and-half oil chamber enters the flow path through the through hole, or the cooling oil enters the half-and-half oil chamber from the flow path through the through hole, and the heat in the pump casing is carried away by the circulation of the cooling oil; Another operating method of the integrated electronic oil pump applied to the integrated electronic oil pump according to the first aspect, including the step of discharging the other part of the cooling oil in the half-and-half oil chamber from the oil drain hole, is provided. [[ID=D3]]

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

[0024] In short, 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. The structure is simple, the assembly accuracy is high, the operating efficiency is high, and the operating life of the product is extended. The electronic oil pump of the present application exhibits a small aspect ratio, the structure of the pump body becomes more stable, reducing the influence of thermal expansion of different materials due to temperature on the axial and radial end face clearances of the pump body, and improving the efficiency of the electronic oil pump. By the operating method of the electronic oil pump of the present application, while realizing the function of the pump, it cools itself, improving efficiency and lifespan.

[0026] 2. In the electronic oil pump of the present application, there is no bearing or nut, no eccentric correction piece is used, the top of the shaft is directly inserted and fixed into the upper cover, the bottom of the shaft is directly inserted into the bottom of the pump chassis, and there is no connection or fixation of other members. This minimal highly integrated structure avoids the machining errors of multiple machined parts and effectively reduces the total tolerance generated during the combination 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 minimal high-integration structure design highly and compactly integrally connects the chassis, shaft, and pump gear, effectively improves the end face clearance, radial clearance of the electronic oil pump, and the air gap of the motor, and further significantly improves the performance and efficiency of the electronic oil pump.

[0028] 4. This minimal high-integration structure effectively avoids the change of the end face clearance and radial clearance of the pump body caused by different members (such as the chassis, shaft, and pump gear, etc.) due to different material temperature thermal expansion coefficients with the change of temperature, which is very beneficial to the improvement of the precision structure of the electronic oil pump.

[0029] 5. This minimal high-integration structure design saves multiple members, reduces material costs, simplifies production assembly costs, and thus reduces the oil pump cost. At the same time, this minimal structure design effectively reduces the vibration and noise 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 supply ports. The lower oil supply port is similar to a general electronic oil pump and is located at the bottom of the pump chassis, and the other upper oil supply port is located on the upper cover. Through the cooperation with the hollow shaft, such a dual oil supply port can realize the function of oil circulation. After the oil is sucked by the lower oil supply port, in the pressure environment formed by the rotation of the eccentric structure of the internal and external gears, a part of the oil directly flows into the upper oil supply port along the hollow shaft. At the upper oil supply port, with the oil cavity formed by the design of the eccentric structure of the internal and external rotors, the pressure increases step by step and then decreases step by step. Therefore, the oil repeatedly flows into and out of the cavity, and the heat generated in the motor and pump body is carried away along with the oil circulation and flows out from the oil drain port. The design of the dual oil supply port 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] Figure 1 is a schematic diagram of the external structure of a first embodiment of the integrated electronic oil pump of this application. [Figure 2] Figure 2 is a schematic perspective cross-sectional view of a first embodiment of the integrated electronic oil pump of this application. [Figure 3] Figure 3 is a cross-sectional view of the internal plan structure of the first embodiment of the integrated electronic oil pump of this application. [Figure 4] Figure 4 is a schematic diagram of the internal bottom structure of the first embodiment of the integrated electronic oil pump of this application. [Figure 5] Figure 5 is a schematic diagram of the bottom structure of the pump casing of the first embodiment of the integrated electronic oil pump of this application. [Figure 6] Figure 6 is a schematic perspective cross-sectional view of a second embodiment of the integrated electronic oil pump of this application. [Figure 7] Figure 7 is a schematic diagram of the internal bottom structure of a third embodiment of the integrated electronic oil pump of this application. [Figure 8] Figure 8 is a schematic diagram of the fitting structure of the eccentric calibration piece in the third embodiment of the integrated electronic oil pump of this application. [Figure 9] Figure 9 is a schematic diagram of the partially disassembled assembly structure of the fixed shaft and internal gear of the third embodiment of the integrated electronic oil pump of this application. [Modes for carrying out the invention]

[0032] To further clarify the object, technical proposal and advantages of the present invention, the present invention will be described in more detail below with reference to the drawings. Generally, the assemblies of the embodiments of the present invention described and shown herein can be arranged and designed in a variety of different configurations. Any other embodiments that a person skilled in the art can obtain without creative work based on the embodiments of the present invention are all within the scope of protection of the present invention.

[0033] It should be noted that in the following drawings, the same symbols and letters represent the same items; therefore, once an item is defined in one drawing, no further definition or explanation is required in subsequent drawings.

[0034] In describing the present invention, unless otherwise specified and limited, terms such as "attached," "connected," and "connected" should be understood broadly. For example, they may be fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or internally connected between two elements. Those skilled in the art will understand the specific meaning of these terms in the present invention depending on the specific circumstances.

[0035] In the description of this application, the orientations or positional relationships indicated by technical terms such as "up," "down," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are merely for the purpose of facilitating and simplifying the description of this application. They do not indicate or suggest that the devices or elements mentioned have a specific orientation or must be constructed and operated in a specific orientation, and therefore should not be understood as limiting this application.

[0036] The embodiments of the present invention will be described in detail below with reference to the drawings. Where there are no inconsistencies, the features of the following embodiments can be combined with each other. Example 1

[0037] Referring to Figures 1 to 5, we will reveal the integrated electronic oil pump.

[0038] Referring to Figure 1, the integrated electronic oil pump comprises a pump casing 1, an oil supply port 11, and an oil discharge port 12.

[0039] Referring to Figure 2, the pump casing 1 contains 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. The pump casing 1 is provided with a fixing hole 131, and the fixed shaft 2 is installed within the fixing hole 131. A passage 21 through which cooling oil passes is provided within the fixed shaft 2, and the internal gear 3 is eccentrically connected to the fixed shaft 2 and rotatably connected. A bushing 22 is connected between the fixed shaft 2 and the internal gear 3 to reduce rotational resistance and improve operational stability. The external gear 4 is coaxially connected to the fixed shaft 2 and rotatably connected within the pump casing 1. The external gear 4 is located on the outer circumference of the internal gear 3 and meshes with the internal gear 3. One end of the passage 21 communicates with the oil supply hole 11, and the cooling oil circulates internally through the passage 21. The motor rotor 5 is fixedly connected to the outer circumference of the external gear 4, and the motor stator 6 is located on the outer circumference of the rotor and is fixedly connected to the pump casing 1, with an air gap 16 remaining between the motor rotor 5 and the motor stator.

[0040] An oil filler port 11 has a filter 14 connected to one end for filtering the coolant. The coolant enters the huff-and-puff oil chamber 41 between the internal gear 3 and the external gear 4 from the oil intake port 132 via the filter 14, 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 housed within the pump casing 1 and comprises 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 wires of the stator winding 61, to distribute the lint regularly and clearly, and to weld the lint to the hub 72, making the process simple and straightforward. Hub 72 Another role of the controller 71 is to separate the controller 71 from the motor section, so that oil flows only through the motor section, forming a cooling and lubrication circuit, and preventing oil from entering the controller 71.

[0042] A hub 72 is provided above the stator assembly. The pins of the stator windings 61 pass through the hub 72, simplifying the design of the electrical control assembly and simplifying the conventional winding structure.

[0043] The controller 71 enables rapid response and features circuit reverse connection protection, signal interference prevention, oil temperature monitoring, overheating prevention, independent communication channel, motor angle position detection, motor rotation speed comparison reception and calculation, and actual rotor rotation speed comparison and adjustment.

[0044] Since the external gears are integrated into the motor rotor and the thermal expansion coefficients of the motor stator 6 and the pump body match, the influence of temperature on the oil pump gap is significantly reduced, the gap at the end face of the pump is precisely guaranteed, and the influence of temperature on the system's flow efficiency can be effectively reduced or avoided.

[0045] During operation, the circuit control module 7 controls the energization of multiple stator windings 61, and the resulting magnetic field and the permanent magnetic field 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 together, that is, 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, thus achieving 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 passages from the electrical control section, improving 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 mounted on the chassis 15, and the PTC temperature sensor 82 is electrically connected to the controller 71. The PTC temperature sensor 82 in this invention can accurately detect the oil temperature to a degree of 0.1°C.

[0047] In particular, in the plane passing through the axis of the fixed shaft 2, the projected areas of the motor stator 6, motor rotor, external gear 4, internal gear 3, and fixed shaft 2 overlap at least partially. Therefore, unlike the series connection structure of the motor and pump in conventional electronic oil pumps, the proposed design of this application is more compact in structure, has shorter oil passages, is more efficient, and offers significant improvements in ease of installation, operational reliability, and operational efficiency.

[0048] Referring to Figures 3 and 4, the motor stator 6 is provided with multiple stator windings 61 in its circumferential direction, the motor rotor 5 is fitted onto 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. An upper cover 8 is further connected to the fixed shaft 2, and both ends of the internal gear 3 and both ends of the external gear 4 are connected to the upper cover 8 and the pump casing 1, respectively, enclosing them to form a huff-and-puff oil chamber 41, the huff-and-puff oil chamber 41 whose volume first increases in stages along the rotational direction of the external gear 4 and then decreases in stages. A through hole 81 is made in the upper cover 8 that communicates with the huff-and-puff oil chamber 41, and the flow path 21 can introduce 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 cooling and lubrication efficiency. The flow path 21 also introduces the cooling oil from the oil supply hole 11 to components such as the motor stator 6 and motor rotor 5 for cooling, achieving multiple internal circulation and improving cooling efficiency.

[0049] Referring to Figures 4 and 5, an oil supply hole 11 is integrally molded into the bottom of the pump casing 1, and an oil discharge hole 12 is integrally molded into the circumferential outer wall. The bottom of the pump casing 1 is integrally molded to cover the oil supply hole 11 and the oil discharge hole 12, and a fixing hole 131 is opened in the axial direction of the end face of the bottom of the pump casing 1 for fixed connection to one end of the fixing shaft 2. The fixing shaft 2 is inserted into the fixing hole 131, and the circumferential outer wall of the fixing shaft 2 and the hole wall of the fixing hole 131 are firmly fitted together. An oil intake port 132 communicating with the oil supply hole 11 and an oil discharge port 133 communicating with the oil discharge hole 12 are opened on the end face of the bottom of the pump casing 1. At the bottom of the pump casing 1, after the oil inlet 132 and oil outlet 133 are opened, a partition portion 134 is formed to separate the oil inlet 132 and the oil outlet 133. One side of the partition portion 134 is bonded to one side of the internal gear 3, improving the airtightness between the oil inlet 132 and the oil outlet 133.

[0050] When the huff-and-puff oil chamber 41 is gradually enlarged, 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. When the huff-and-puff oil chamber 41 is gradually reduced, 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 for the cooling oil of the present invention to cool the stator assembly is as follows.

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

[0053] Furthermore, the other pressurized cooling oil is discharged directly from the oil drain hole 12 through the high-pressure region.

[0054] In this invention, the specific process for cooling the stator assembly is as follows:

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

[0056] 2) The motor rotor 5, together with the external gear 4, drives the internal gear 3 to rotate around the fixed shaft 2, pressurizing the cooling oil flowing in from the oil supply hole 11. The pressurized cooling oil flows through the fixed shaft 2 to the stator assembly, cooling the stator assembly. The heat-exchanged cooling oil then flows again to the low-pressure region, pressurizing the cooling oil due to the pressure difference caused by 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 and feeds this temperature value back to the controller 71, which then feeds the current oil temperature value back to an external control system.

[0057] 3) The other pressurized cooling oil is discharged directly from the drain hole 12 after passing through the high-pressure region.

[0058] Because the overall height of the electronic oil pump is reduced, the time it takes for the pressurized cooling oil to flow to the stator assembly is shorter in this embodiment compared to conventional electronic oil pumps, resulting in a superior temperature reduction effect. In this embodiment, the motor stator 6 is manufactured using silicon steel sheet material, reducing manufacturing costs and frictional force of the rotating members, and the wire diameter of the stator winding 61 is 1.8 mm, which is significantly improved compared to the conventional 1.6 mm, resulting in a substantial improvement in rotor pump performance.

[0059] An O-shaped seal ring is further provided on the outer circumference of the pump casing 1, and in this embodiment, the material of the O-shaped seal ring is rubber. The O-shaped seal ring is used for horizontal and axial deformation, and helps in sealing, reducing oil leakage, and creating high pressure, making it economical, efficient, easy to assemble, having a long service life, and easy to maintain. Example 2

[0060] Referring to Figure 6, this embodiment differs from Embodiment 1 in that a ball bearing 9 is provided between the external gear 4 and the pump casing 1, improving the stability of the rotation of the external gear 4. For cold starting 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 in this embodiment, the sensor 82 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] In this invention, compared to conventional electronic oil pumps where the motor rotor 5 is press-fitted into the ball bearing 9 bracket before being press-fitted into the ball bearing 9 and pump gear, the ball bearing 9 bracket is not installed. On the one hand, this shortens the overall height of the electronic oil pump, shortens the path of the cooling oil that flows into and pressurizes the stator assembly, reduces the time required, and improves the temperature reduction effect. On the other hand, it avoids cumulative mounting errors and eliminates the hidden risk of air gap eccentricity. Example 3

[0062] Referring to Figures 7 to 9, the difference between Embodiment 1 and Embodiment 2 is that an eccentricity calibration piece 23 is provided between the fixed shaft 2 and the internal gear 3 to ensure that the internal gear 3 and the fixed shaft 2 are eccentric. The eccentricity calibration piece 23 in this embodiment is a crescent-shaped sleeve, and the crescent-shaped sleeve enables accurate eccentric positioning of the internal gear 3 relative 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 crescent-shaped sleeve, and an assembly guide hole 135 corresponding to the positioning hole 231 is drilled at the bottom of the pump casing 1. The assembly guide hole 135 and the fixing hole 131 (see Figure 5) are eccentrically positioned, and the external gear 4 is rotatably connected to the fixed shaft 2. At the same time, the crescent-shaped sleeve is also rotatably connected to the internal gear 3, so that the internal gear 3 and the external gear 4 rotate coaxially and eccentrically. 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 change in volume, thereby circulating the cooling oil. Example 4

[0064] This embodiment is, The motor rotor 5 and the external gear 4 rotate, driving the internal gear 3 to rotate. The internal gear 3 and the external gear 4 pressurize the cooling oil, We disclose an operating method for the electronic oil pump applicable to the electronic oil pump in the above embodiment, which includes the steps of: one side of the pressurized coolant flows through the passage 21 to the motor stator 6, and the other side of the pressurized coolant is discharged outside the pump casing 1. Example 5

[0065] This embodiment is, The motor rotor 5 and the external gear 4 rotate, driving the internal gear 3 to rotate. The internal gear 3 and external gear 4 circulate cooling oil within the huff-and-puff oil chamber 41 to pressurize and depressurize, As the pressure of the coolant increases or decreases, some of the coolant in the huff-and-puff oil chamber 41 enters the passage 21 through the through hole 81, or coolant 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 coolant. We disclose another method of operating an electronic oil pump applicable to the electronic oil pumps in Examples 1 to 3, which includes the step of discharging the other portion of the cooling oil in the huff-and-puff oil chamber 41 through the drain hole 12.

[0066] The basic principles, main features, and advantages of the present invention have been shown and explained above. Those skilled in the art should understand that the present invention is not limited to the embodiments described above, and that the embodiments and descriptions described above merely illustrate the principles of the present invention. The present invention can be modified, altered, substituted and transformed in various ways without departing from the spirit and scope of the invention, and all such modifications, alterations, substitutions and transformations are included in the claims. [Explanation of Symbols]

[0067] 1. Pump casing 11. Fuel filler port 12, oil drain hole 13. Bottom of the pump casing 131, fixed hole 132. Oil intake port 133, Oil drain port 134, Partition section 135, Assembly guide hole 14. Filter 15. Chassis 16. Air gap 2. Fixed shaft 21. Flow channel 22. Bushing 23. Eccentricity calibration piece 231, Positioning hole 3. Internal gears 4. External gears 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 port (11), and an oil discharge port (12), A fixed shaft (2) is provided in the pump casing (1), and a passage (21) through which cooling oil passes is provided inside the fixed shaft (2), An internal gear (3) is eccentrically connected to the fixed shaft (2) and rotatably connected, The external gear (4) is coaxially connected to the fixed shaft (2), rotatably connected within the pump casing (1), located on the outer circumference of the internal gear (3), and meshes with the internal gear (3). A motor rotor (5) is fixedly connected to the outer circumference of the external gear (4), The motor rotor (5) is located on the outer circumference of the motor stator (6), which is fixedly connected to the pump casing (1), The flow path (21) has one end communicating with the oil supply hole (11) and the other end indirectly communicating with the oil discharge hole (12), and the cooling oil is circulated internally by the integrated electronic oil pump via the flow path (21). An integrated electronic oil pump characterized by the following features.

2. In the plane passing through the axis of the fixed shaft (2), the projected regions of the motor stator (6), motor rotor (5), external gear (4), internal gear (3), and fixed shaft (2) overlap at least partially. The integrated electronic oil pump according to feature 1.

3. The external gear (4) is connected to the pump casing (1) via a bearing. The integrated electronic oil pump according to claim 1 or 2.

4. The apparatus further includes an upper cover (8), and both ends of the internal gear (3) and both ends of the external gear (4) are connected to the upper cover (8) and the pump casing (1), respectively, and together they enclose a huff-and-puff oil chamber (41). The integrated electronic oil pump according to feature 1.

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) through the through hole (81). The integrated electronic oil pump according to feature 4.

6. The external gear (4) and the internal gear (3) surround a plurality of huff-and-puff oil chambers (41), the volume of which increases gradually along the rotational direction of the external gear (4) and then decreases gradually, the pump casing (1) is provided with an oil supply hole (11) and an oil drain hole (12), the oil supply port of the huff-and-puff oil chamber (41) corresponds to the oil supply hole (11) when the huff-and-puff oil chamber (41) increases gradually, and the oil drain port of the huff-and-puff oil chamber (41) corresponds to the oil drain hole (12) when the huff-and-puff oil chamber (41) decreases gradually. The integrated electronic oil pump according to feature 5.

7. When the huff-and-puff oil chamber (41) is gradually enlarged, coolant flows into the huff-and-puff oil chamber (41) through the oil supply hole (11), and when the huff-and-puff oil chamber (41) is gradually reduced, the coolant inside the huff-and-puff oil chamber (41) is pressurized and discharged from the oil drain hole (12). The integrated electronic oil pump according to feature 6.

8. The flow path (21) communicates with the oil supply hole (11), and when the huff-and-puff oil chamber (41) is gradually enlarged, the coolant 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) is gradually reduced, the coolant in the huff-and-puff oil chamber (41) is pressurized and flows into the flow path (21) from the through hole (81). The integrated electronic oil pump according to feature 6.

9. A method for operating an integrated electronic oil pump, applicable to the integrated electronic oil pump described in claim 1, The motor rotor (5) and the external gear (4) rotate, driving the internal gear (3) to rotate. The internal gear (3) and the external gear (4) pressurize the cooling oil, The process includes the steps of: one end of the pressurized coolant flows through a passage (21) to the motor stator (6), and the other end of the pressurized coolant is discharged outside the pump casing (1). A method for operating an integrated electronic oil pump, characterized by the features described herein.

10. A method for operating an integrated electronic oil pump, applicable to an integrated electronic oil pump according to any one of claims 6 to 8, The motor rotor (5) and the external gear (4) rotate, driving the internal gear (3) to rotate. The internal gear (3) and the external gear (4) circulate cooling oil within the huff-and-puff oil chamber (41) to pressurize and depressurize, As the pressure of the coolant increases or decreases, a portion of the coolant in the huff-and-puff oil chamber (41) enters the passage (21) through the through hole (81), or coolant 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 coolant. The step includes the discharge of the other portion of the coolant in the huff-and-puff oil chamber (41) through the drain hole (12). A method for operating an integrated electronic oil pump, characterized by the features described herein.

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