Electronic Oil Pump

Abstract

To provide an electronic oil pump with a high precision design that can improve the concentricity control accuracy of a fixed shaft, a pump casing, and a motor. [Solution] The electronic oil pump has a pump casing, to which an external gear 2 and an internal gear 3 that mesh with each other are connected, and a fixed shaft 4 that is arranged concentrically with the pump casing is connected inside the pump casing, the external gear 2 is connected to the fixed shaft 4, and the external gear 2 and the pump casing are arranged concentrically, the fixed shaft 4 has a connecting part, and an eccentric calibration piece 5 is provided on the outer peripheral wall of the connecting part, the eccentric calibration piece 5 and the connecting part form an eccentric assembly 41, the internal gear 3 is arranged to rotate around the geometric center axis of the eccentric assembly 41, and the eccentric assembly 41 and the pump casing are not arranged concentrically.

Description

[Technical Field]

[0001] The present invention relates to the technical field of new energy automobiles, and in particular to an electronic oil pump with a high precision design. [Background technology]

[0002] With the rapid development of automotive electronics and new energy vehicles, integrated, precision-designed electronic oil pumps are finding widespread application due to their high efficiency, energy saving, and flexible control. In general, integrated electronic oil pumps are mainly composed of three parts: a controller, a motor, and a rotor gear pump. The rotor gear pump includes a pump casing and a gear set. The gear set includes an external gear and an internal gear that mesh with each other and are installed inside the pump casing. The internal gear is connected to the pump casing by a fixed shaft, and the internal gear is eccentrically arranged relative to the external gear, forming an integrated motor rotor and gear pump. The circuit control module of the controller provides a control signal to the motor, and the electromagnetic force of the motor stator and the permanent magnetic force of the applied motor rotor interact with each other to drive the motor rotor to rotate, causing the integrated motor rotor and gear pump to rotate synchronously, and the rotor pump external gear to rotate the internal gear. The internal gear and the external gear are eccentrically meshed to form several closed oil intake and discharge cavities, and as the internal gear and the rotor external gear rotate in a set direction, the volume of the sealed oil intake and discharge cavities increases and then decreases step by step, and the volume of oil pressed into and out of the sealed oil cavities increases and decreases repeatedly. When the oil intake and discharge cavities increase step by step, they correspond to and communicate with the oil supply hole of the pump casing, and when the oil intake and discharge cavities decrease step by step, they correspond to and communicate with the oil drain hole of the pump casing, thus forming oil passages in the electronic oil pump.

[0003] Currently, conventional electronic oil pumps have problems with insufficient precision in terms of concentricity control of the fixed shaft, pump casing, and motor. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of this, an object of the present invention is to provide an electronic oil pump that is designed with high precision and that can improve the accuracy of concentricity control of the fixed shaft, pump casing, and motor. [Means for solving the problem]

[0005] The electronic oil pump provided in the present invention adopts the following technical solutions: On the other hand, the present invention provides a highly precisely designed electronic oil pump that includes a pump casing, wherein an external gear and an internal gear that mesh with each other are rotatably connected to the pump casing, a fixed shaft that is concentrically arranged with the pump casing is connected within the pump casing, the external gear is connected to the fixed shaft, the external gear and the pump casing are concentrically arranged, the fixed shaft has a connecting portion, an eccentric calibration piece is provided on the outer peripheral wall of the connecting portion, the eccentric calibration piece and the connecting portion constitute an eccentric assembly, the internal gear is arranged to rotate around the geometric center axis of the eccentric assembly, and the eccentric assembly and the pump casing are not arranged concentrically.

[0006] The above technical solution requires only one fixed shaft within the pump casing, and then an eccentric calibration piece is attached to the circumferential sidewall of the fixed shaft to form an eccentric assembly. The eccentric calibration piece compensates for concentricity deviations caused by the processing and assembly of multiple components, such as the pump casing, fixed shaft, and motor, thereby effectively ensuring the concentricity of the pump casing, fixed shaft, and motor. In this way, the external gear is rotatably connected to the fixed shaft, and the eccentric assembly is also rotatably connected to the internal gear, achieving the effects of coaxiality and eccentricity between the internal gear and the external gear. At the same time, because the fixed shaft and the pump casing are concentrically arranged, the motor rotor achieves high concentricity with the fixed shaft and the pump casing through the fixed shaft, effectively compensating for insufficient concentricity caused by tolerance accumulation during processing and assembly.

[0007] Only one hole needs to be drilled on the pump casing to fit the fixed shaft, which effectively reduces the complexity of the pump casing processing, improves the processing efficiency of the pump casing, and improves the accuracy of the fitting between the external gear and the internal gear of the rotor pump.

[0008] Optionally, the eccentricity calibration piece is a half moon set provided on the circumferential outer wall of the fixed shaft, and the half moon set is provided with an arc groove into which the fixed shaft is fitted.

[0009] By adopting the above technical solution, the circumferential side wall portion of the fixed shaft is fitted into the arc groove, and the circumferential side wall of the fixed shaft and the circumferential outer wall of the half-moon set form an eccentric assembly that is rotationally connected to the internal gear, thereby realizing the effect of coaxiality and eccentricity between the internal gear and the external gear, effectively compensating for the lack of eccentricity of the motor's circular center and shaft center caused by the accumulated tolerances during processing and assembly, and also maintaining the mutual drive based on the circular centerline of the internal gear and external gear of the rotor pump.

[0010] Optionally, a bearing is tightly fitted to the top end of the fixed shaft, the internal gear is fitted coaxially to the fixed shaft, and has an internal gear inner circle that abuts against the eccentric assembly, and the motor rotor inner circle is axially arranged to abut against the external gear outer circle. R, The upper part of the motor rotor outer circle (also called the motor rotor neck) has an inner circle that is tightly fitted onto the outer ring of the bearing, and the eccentric assembly is fitted onto a fixed shaft via an intermediate bushing, which is fitted onto the inner ring of an internal gear.

[0011] By adopting the above technical solution, the conventional mounting of the fixed shaft and pump casing is achieved by designing a step at the bottom of the pump casing. The fixed end of the fixed shaft passes through the step and is threadedly connected to a nut, which abuts against the end surface of the step. The frictional force generated by the abutment between the nut and the step secures the fixed shaft to the pump casing. However, the tightness of the nut affects the clearance between the axial end surface of the pump body. During operation, the temperature inside the pump casing increases, and the thermal expansion coefficients of the materials of the pump casing, fixed shaft, and nut (e.g., aluminum, stainless steel, and steel) differ, causing changes in the clearance between the axial end surfaces, which further affects the performance of the pump body. In the present invention, the step and nut on the pump casing are eliminated. One end of the fixed shaft passes directly through the pump casing with an interference fit, and the other end is tightly fitted to the inner surface of the bearing. This tight fit at both ends completely limits the insertion depth of the fixed shaft in the chassis. The simplified structure proposed by the present invention effectively avoids the cumulative effects of multiple interfaces and tolerances in the prior art, such as the fixed shaft, steps, nuts, etc. The fixed shaft is simply fitted and passed through the bottom of the pump housing, eliminating the need for multiple components and reducing the impact of thermal expansion of different materials on the axial and radial end face gaps of the pump body due to temperature, thereby improving the operating efficiency of the pump body.

[0012] The inner circumferential wall of the motor rotor neck of the motor rotor outer circle is fastened to the outer circumferential wall of the bearing to realize the rotational connection between the external gear and the fixed shaft. The bushing located between the half-moon set and the fixed shaft not only fastens the half-moon set and the fixed shaft but also realizes the rotational connection with the internal gear. The outer circumferential wall of the bushing is attached to the inner circumferential wall of the internal gear to realize the rotational connection between the eccentric assembly and the internal gear.

[0013] In the past, the rotational connection between the external gear and the pump casing was achieved by firmly fitting a large-radius bearing onto the circumferential outer wall of the external gear, and the circumferential outer wall of the bearing was tightened into the pump casing. However, the large radius of the bearing makes it easy for obvious mechanical wear to occur during operation, shortening the bearing's lifespan and requiring frequent replacement, which affects the operating efficiency of the pump and increases production costs. In the present invention, by firmly fitting a small-sized bearing with the fixed shaft and motor rotor neck, mechanical friction is effectively reduced, improving the operating efficiency of the pump while reducing production costs.

[0014] Optionally, a plurality of oil intake and discharge cavities are formed by the inner circle of the external gear, the outer circle of the motor rotor and the internal gear, and the volumes of the oil intake and discharge cavities first increase stepwise along the rotation direction of the external gear and then decrease stepwise. The pump casing is provided with an oil supply hole and an oil drain hole, and when the oil intake and discharge cavities increase stepwise, the outlets of the oil intake and discharge cavities correspond to the oil supply holes, and when the oil intake and discharge cavities decrease stepwise, the outlets of the oil intake and discharge cavities correspond to the oil drain holes.

[0015]

[0003] By adopting the above technical solution, a plurality of closed oil intake and discharge cavities are formed around the circumferential inner wall of the inner circle of the external gear, the inner end face of the outer circle of the external gear, and the circumferential outer wall of the internal gear. When the internal gear and the external gear rotate relative to each other, the oil intake and discharge cavities gradually increase in volume through the oil supply holes, and the oil volume in the oil intake and discharge cavities increases with the increase in volume. During oil intake, the cool oil comes into contact with the teeth of the internal gear and the external gear, and the oil absorbs heat from the teeth. The oil intake and discharge cavities gradually decrease in volume through the oil drain holes, and the oil volume in the oil intake and discharge cavities decreases with the decrease in volume. The hot oil that has absorbed heat during oil intake is discharged from the pump body through the oil drain holes, thereby achieving cooling and lubrication of the internal gear and the external gear, and cooling of the pump body, and ensuring the operating temperature and efficiency of the pump.

[0016] Optionally, the pump casing has a pump casing bottom that covers the oil supply hole and the oil drain hole, the pump casing bottom has a fixing hole that is fixedly connected to one end of the fixed shaft, the pump casing bottom has an oil suction port that communicates with the oil supply hole and an oil discharge port that communicates with the oil drain hole, and the pump casing bottom has a partition that separates the oil suction port and the oil discharge port, one side of the partition is attached to one side of the internal gear.

[0017] By adopting the above technical solution, the partition effectively separates the oil inlet and oil outlet, guarantees the contact time between the oil and the internal gear and the external gear, and improves the temperature reduction effect through heat exchange. When one side of the partition is attached to one side of the internal gear, the closure of the oil inlet and outlet cavities is guaranteed.

[0018] Optionally, a positioning hole is provided on one side of the half moon set, and an assembly guide hole corresponding to the positioning hole is provided on the bottom of the pump casing.

[0019] By adopting the above technical solution, when installing the internal gear and external gear, the pin roll is used to fix them in the positioning hole, and the pin roll is passed through the guide hole to realize the positioning of the internal gear, which serves as a guide for installing the fixed shaft, contributes to improving the eccentricity deviation of the internal gear and external gear, and improves the fitting accuracy of the internal gear and external gear.

[0020] By providing a positioning hole in the eccentricity calibration piece and a corresponding assembly guide hole in the bottom boss of the pump casing, a guide hole for shaft assembly is formed, which reduces the eccentricity of the motor, pump casing and fixed shaft caused by the tolerance accumulation in the machining and assembly of multiple parts such as the motor, shaft, pump casing and gear pump, effectively improving the air gap between the motor stator and rotor and the radial clearance of the pump body system, while also improving the assembly accuracy of the rotor pump internal gear and external gear.

[0021] Optionally, the pump casing is provided with a filter located at and covering the oil supply hole.

[0022] By adopting the above technical solution, the filter filters the oil passing through the oil supply hole, and reduces the influence of impurities in the oil on the operation of the pump.

[0023] Optionally, the pump may further include a motor rotor and a circuit control module, the circuit control module including a controller provided within the pump casing, a hub, and a motor stator provided on the hub, the motor stator having a plurality of stator winding coils provided in its circumferential direction, the motor rotor fitted onto the circumferential outer edge of the external gear, and the circumferential outer wall of the motor rotor corresponding to the circumferential inner wall of the motor stator.

[0024] By adopting the above technical solution, the controller controls the hub to energize the multiple stator winding coils in the motor stator. After the multiple stator windings are energized, the generated magnetic field and the permanent magnetic field of the rotor magnet interact to drive the motor rotor to rotate, and the motor rotor is integrated into the outer rotor of the gear pump, i.e., the motor stator and the rotor magnet interact to drive the rotor external gear pump to rotate, and further, the outer gear of the rotor gear pump drives the internal gear to rotate, thereby realizing the relative rotation of the internal gear and the external gear.

[0025] Optionally, an air gap is provided between the outer circumferential wall of the motor rotor and the inner circumferential wall of the motor stator.

[0026] By adopting the above technical solution, the reserved gap can be called an air gap, which reduces contact between the motor rotor and the stator winding coil, reduces frictional force, reduces relative rotation between the external gear and the internal gear, and contributes to reducing noise and friction-induced vibration. This design optimizes the geometry of the rotor magnet to reduce the air gap between the motor rotor and the stator winding, reducing tooth space torque and hysteresis during motor startup and phase commutation, making the motor rotate more smoothly and reducing noise and vibration.

[0027] Optionally, the pump casing is provided with a chassis for separating the controller and the hub.

[0028] By adopting the above technical solution, the chassis separates the oil circuit and the electronic control part, improves the sealing property, and ensures that the controller operates at a suitable temperature. [Effects of the Invention]

[0029] In summary, the present invention includes at least one of the following beneficial technical effects: 1. Only one fixed shaft is provided in the pump casing, and an eccentricity calibration piece is provided on the circumferential side wall of the fixed shaft to form an eccentric assembly. The external gear is rotatably connected to the fixed shaft, and at the same time, the eccentric assembly is rotatably connected to the internal gear. This achieves the effect of coaxiality and eccentricity between the internal gear and the external gear, effectively compensates for the eccentricity of the motor's center of gravity and shaft center caused by the accumulated tolerances during processing and assembly, and also maintains the mutual drive based on the center of gravity of the internal gear and the external gear of the rotor pump. 2. Regarding the installation of the fixed shaft and pump casing, the present invention eliminates the step and nut that are common in pump casings. One end of the fixed shaft passes directly through the pump casing and is tightly fitted, and the other end is fastened by a bearing, limiting the insertion depth of the fixed shaft in the chassis. This effectively avoids the cumulative impact of multiple interfaces and multiple tolerances such as the fixed shaft, step, nut, etc. that occur in the previous design, and effectively reduces the impact of thermal expansion of dissimilar materials due to temperature on the air gap at the axial end of the pump body, thereby improving the operating efficiency of the pump body. 3. The outer circumference of the external gear is fastened to the inner circumferential wall of the motor rotor neck and the outer circumferential wall of the bearing, thereby realizing the rotational connection between the external gear and the fixed shaft. The bushing not only fastens the half-moon set and the fixed shaft, but also realizes the rotational connection with the internal gear. The outer circumferential wall of the bushing and the inner circumferential wall of the internal gear are attached to realize the rotational connection between the eccentric assembly and the internal gear. 4. Regarding the connection between the external gear and the pump casing, the present invention uses a small-sized bearing that is firmly fitted with the fixed shaft and electronic rotor neck, which effectively reduces mechanical friction, improves the pump's operating efficiency, and reduces production costs. 5. The internal and external gears are installed by fixing them in the locating hole with a pin roll and passing the pin roll through the guide hole to position the internal gear. At the same time, it serves as a guide for the installation of the fixed shaft, contributing to improving the eccentricity deviation of the internal and external gears and improving the precision of the fit between the internal and external gears. The locating hole designed on the eccentricity calibration piece and the locating hole in the bottom boss of the pump casing form a guide hole for shaft assembly, reducing the eccentricity of the motor center, pump casing center and axis center caused by the accumulated tolerances of the machining and assembly of multiple components such as the motor, shaft, pump casing and gear pump. This effectively improves the air gap between the motor stator and rotor and the radial clearance of the pump body system, while also improving the assembly precision of the rotor pump internal and external gears. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention. [Figure 2] FIG. 2 is a structural schematic diagram of the circuit control module, external gear and internal gear according to an embodiment of the present invention. [Figure 3] FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention. [Figure 4] FIG. 4 is a schematic local cross-sectional view of an embodiment of the present invention. [Figure 5] FIG. 5 is a structural schematic diagram of a motor stator according to an embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram of the bottom structure of a pump casing according to an embodiment of the present invention. [Figure 7] FIG. 7 is a schematic diagram showing the structure of the external gear and the internal gear according to an embodiment of the present invention. [Figure 8] FIG. 8 is a schematic diagram showing the structure of the eccentricity calibration piece according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] The present invention will be described in more detail below with reference to Figures 1 to 8. The present invention provides an electronic oil pump with a high precision design.

[0032] Referring to Figures 1 and 2, a highly precisely designed electronic oil pump is shown, which includes a pump casing 1, a motor, a circuit control module 9, and a gear set, the motor including a motor rotor 8, a motor stator 93, and a stator winding 94, the motor stator 93 being fixed within the pump casing 1, the motor rotor 8 being provided within the motor stator 93, and multiple sets of stator windings 94 being provided and wound in a circular matrix around the motor stator 93 and located between the motor rotor 8 and the motor stator 93.

[0033] Here, the gear set comprises an external gear 2 fixed integrally with the motor rotor 8, and an internal gear 3 located within the external gear 2 and meshing with the internal teeth of the external gear 2.

[0034] During operation, the circuit control module 9 controls the plurality of stator windings 94 to be energized, and the resulting magnetic field interacts with the permanent magnetic field of the magnets in the motor rotor 8 to drive the motor rotor 8 to rotate. The motor rotor 8 and the external gear 2 are fixed, i.e., the motor stator 93 and the magnets in the motor rotor 8 interact with each other to drive the external gear 2 to rotate, and the external gear 2 further drives the internal gear 3 to rotate, thereby realizing relative rotation between the internal gear 3 and the external gear 2.

[0035] 3 and 4, the circuit control module 9 is provided in the pump casing 1 and includes a hub 92 located above the motor, and a controller 91 located above the hub 92. The role of the hub 92 is to collect the input and output lines of the stator winding 94, ensure regular and clear distribution of the lint, and weld the lint to the hub 92, a simple and easy process. Another role of the hub 92 is to separate the controller 91 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 91.

[0036] The external gear 2 has an external gear inner circle 23 that meshes with the internal gear 3. The motor rotor inner circle is fixed and fitted onto the external gear outer circle. The permanent magnets of the motor rotor 8 are fixed to the outer periphery of the motor rotor outer circle 24, and an air gap 16 is provided between the permanent magnets of the motor rotor 8 and the stator windings 94. During the research and development process, it is necessary to minimize the influence of various factors on the stability of the air gap 16 distance. A motor rotor neck 22 is integrally molded on top of the motor rotor outer circle 24, and a bearing 6 is mounted within the motor rotor neck 22.

[0037] 5 and 6, a fixing hole 131 is formed in the bottom of the pump casing 1 and is arranged concentrically with the pump casing 1. A fixed shaft 4 is inserted through the fixing hole 131, and the fixed shaft 4 and a bearing 6 are firmly fitted together. A motor rotor neck 22 fitted into the bearing 6 is integrally formed with one side of the external gear 2. The internal gear is fitted coaxially with the fixed shaft 4 and has an internal gear inner circle that abuts the eccentric assembly, and the motor rotor inner circle is axially attached to the external gear outer circle. The motor rotor neck 22 fitted into the bearing 6 is integrally formed with one side of the motor rotor outer circle 24, and the motor rotor neck 22 and one side of the motor rotor outer circle 24 form a groove into which the bearing 6 is fitted, and the circumferential outer wall of the bearing 6 is firmly fitted together with the circumferential groove wall of the groove.

[0038] 6 to 8, the circumferential inner wall of the external gear inner circle 23 and the circumferential outer wall of the internal gear 3 are both attached to the inner end surface of the motor rotor outer circle 24, and the area between the external gear 2 and the internal gear 3 is divided by tooth-to-tooth contact, forming multiple closed oil intake and discharge cavities 21, the volume of which first increases and then decreases in stages in the rotation direction of the external gear 2, and 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. Volume of but Increase In this case, the intake and discharge oil cavity 21 corresponds to the oil supply hole 11, and the intake and discharge oil cavity 21 The volume of When the oil intake and discharge cavity 21 is small, the oil discharge hole 12Correspondingly, at the bottom of the pump casing 1, there is a filter 14 located at the oil supply hole 11 and covering the oil supply hole 11.

[0039] A pump casing bottom 13 is integrally formed with the bottom of the pump casing 1, covering the oil supply hole 11 and the oil drain hole 12. A fixing hole 131 is formed in the axial direction of the end face of the pump casing bottom 13, and the fixing hole 131 is fixedly connected to one end of the fixed shaft 4. The fixed shaft 4 is inserted into the fixing hole 131, and the circumferential outer wall of the fixed shaft 4 and the hole wall of the fixing hole 131 are tightly fitted together. An oil suction port 132 communicating with the oil supply hole 11 and an oil discharge port 133 communicating with the oil drain hole 12 are formed in the end face of the pump casing bottom 13. After the oil suction port 132 and the oil discharge port 133 are formed in the pump casing bottom 13, a partition 134 is formed to separate the oil suction port 132 from the oil discharge port 133. One side of the partition 134 is attached to one side of the internal gear 3, improving the seal between the oil suction port 132 and the oil discharge port 133.

[0040] A positioning hole 52 is drilled through one side of the half-moon set, and an assembly guide hole 135 corresponding to the positioning hole 52 is drilled in the bottom part 13 of the pump casing, and the assembly guide hole 135 and the fixing hole 131 are eccentrically arranged.

[0041] The implementation principle of the highly accurate electronic oil pump according to the embodiment of the present invention is as follows.

[0042] A fixed shaft 4 is provided inside the pump casing 1, and then an eccentric calibration piece 5 is provided on the circumferential side wall of the fixed shaft 4 to form an eccentric assembly 41. The external gear 2 and the fixed shaft 4 are rotationally connected, and at the same time, the eccentric assembly 41 is also rotationally connected to the internal gear 3, thereby achieving the effect of coaxiality and eccentricity between the internal gear 3 and the external gear 2.

[0043] The pump casing 1 has one hole that fits with the fixed shaft 4, which effectively reduces the complexity of the processing of the pump casing 1, improves the processing efficiency of the pump casing 1, and improves the precision of the fitting between the external gear 2 and the internal gear 3.

[0044] The controller 91 controls the hub 92 to energize the coils of the multiple stator windings 94 in the motor stator 93. After the multiple stator windings 94 are energized, a magnetic field is generated, driving the motor rotor 8 to rotate, and the motor stator 93 drives the external gear 2 to rotate, thereby realizing relative rotation between the external gear 2 and the internal gear 3.

[0045] When the internal gear 3 and the external gear 2 rotate relative to each other, the oil intake and discharge cavity 21 gradually increases in volume as it draws in oil through the oil supply hole 11, and the amount of oil in the oil intake and discharge cavity 21 increases as its volume increases. During oil intake, the low-temperature oil comes into contact with the teeth of the internal gear 3 and the external gear 2, and the oil absorbs heat from the teeth. The oil intake and discharge cavity 21 gradually decreases in volume as it discharges oil through the oil drain hole 12, and the oil that has absorbed heat during oil intake and become hot is discharged from the pump body through the oil drain hole 12, thereby cooling and lubricating the internal gear 3 and the external gear 2, and also cooling the pump body.

[0046] All of the above are preferred embodiments of the present invention, and do not limit the protection scope of the present invention, so that any equivalent modifications made based on the structure, shape and principle of the present invention shall fall within the protection scope of the present invention. [Explanation of symbols]

[0047] 1 pump casing; 11 Oil filler hole 12 Oil drain hole 13 Pump casing bottom 131 Fixed hole 132 Oil intake port 133 Oil outlet 134 Partition 135 Assembly guide hole 14 filters 15 chassis 16 Air Gap 2 External gear 21 Suction and discharge oil cavity 22 Motor rotor neck 23 External gear inner circle 24 Motor rotor outer circle 3 Internal gear 4 Fixed shaft 41 Eccentric aggregate 5 Eccentricity calibration piece 51 Arc groove 52 Positioning hole 6 Bearings 7 Bushing 8 Motor rotor 9 Circuit Control Module 91 Controller 92 Hub 93 Motor stator 94 Stator Winding

Claims

1. An electronic oil pump comprising a pump casing (1), An external gear (2) and an internal gear (3) meshing with each other are connected to the pump casing (1), a fixed shaft (4) is connected inside the pump casing (1) and is arranged concentrically with the pump casing (1), the external gear (2) is rotatably connected to the fixed shaft (4) and the external gear (2) is arranged concentrically with the pump casing (1), the fixed shaft (4) has a connecting part, an eccentric calibration piece (5) is provided on the outer peripheral wall of the connecting part, the eccentric calibration piece (5) and the connecting part constitute an eccentric assembly (41), the internal gear (3) is rotatable around the geometric center axis of the eccentric assembly (41), and the eccentric assembly (41) is not arranged concentrically with the pump casing (1), The electronic oil pump further comprises a motor rotor (8), the motor rotor (8) being fitted onto the circumferential outer edge of the external gear (2), a bearing (6) being firmly fitted onto one end of the fixed shaft (4), a motor rotor neck formed on the motor rotor outer circle (24) of the motor rotor (8) being provided with an inner circle that is firmly fitted onto the outer ring of the bearing (6), and the motor rotor inner circle of the motor rotor (8) being axially arranged to be attached to the external gear outer circle of the external gear (2). An electronic oil pump.

2. The eccentricity calibration piece (5) is a half-moon set provided on the circumferential outer wall of the fixed shaft (4), and the half-moon set is provided with an arc groove (51) into which the fixed shaft (4) is fitted.

2. The electronic oil pump according to claim 1.

3. The internal gear (3) is fitted coaxially with the fixed shaft (4) and has an internal gear inner circle that abuts against the eccentric assembly (41), an intermediate bushing (7) is fitted to the internal gear inner circle, and the eccentric assembly (41) is rotatably fitted to the internal gear (3) via the intermediate bushing (7).

2. The electronic oil pump according to claim 1.

4. A plurality of intake and discharge oil cavities (21) are formed by the external gear inner circle (23) of the external gear (2), the motor rotor outer circle (24), and the internal gear (3), the intake and discharge oil cavities (21) first increase in volume along the rotation direction of the external gear (2) and then decrease in volume, the pump casing (1) is provided with an oil supply hole (11) and an oil drain hole (12), and when the volume of the intake and discharge oil cavities (21) increases, the intake and discharge oil cavities (21) correspond to the oil supply hole (11), and when the volume of the intake and discharge oil cavities (21) decreases, the intake and discharge oil cavities (21) correspond to the oil drain hole (12).

4. The electronic oil pump according to claim 3.

5. The pump casing (1) is provided with a pump casing bottom (13) that covers the oil supply hole (11) and the oil drain hole (12), and the pump casing bottom (13) is provided with a fixing hole (131) that is fixedly connected to one end of the fixed shaft (4), and the pump casing bottom (13) is provided with an oil suction port (132) that communicates with the oil supply hole (11) and an oil discharge port (133) that communicates with the oil drain hole (12), and the pump casing bottom (13) is provided with a partition part (134) that separates the oil suction port (132) and the oil discharge port (133), and one side of the partition part (134) is attached to one side of the internal gear (3).

5. The electronic oil pump according to claim 4.

6. The eccentricity calibration piece (5) is a half-moon set provided on the circumferential outer wall of the fixed shaft (4), and a positioning hole (52) is provided on one side of the half-moon set, and an assembly guide hole (135) corresponding to the positioning hole (52) is provided on the bottom of the pump casing (13).

6. The electronic oil pump according to claim 5.

7. The pump casing (1) is provided with a filter (14) located in the oil supply hole (11) and covering the oil supply hole (11).

5. The electronic oil pump according to claim 4.

8. The pump further includes a circuit control module (9), the circuit control module (9) including a controller (91) provided in the pump casing (1), a hub (92), and a motor stator (93) provided on the hub (92), the motor stator (93) having a plurality of stator windings (94) provided in its circumferential direction, and the circumferential outer wall of the motor rotor (8) corresponds to the circumferential inner wall of the motor stator (93).

2. The electronic oil pump according to claim 1.

9. An air gap (16) is provided between the circumferential outer wall of the motor rotor (8) and the circumferential inner wall of the motor stator (93).

9. The electronic oil pump according to claim 8.

10. The pump casing (1) is provided with a chassis (15) for separating the controller (91) and the hub (92).

9. The electronic oil pump according to claim 8.

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