Electronic oil pump

Abstract

ELECTRONIC OIL PUMP The present invention relates to an electronic oil pump comprising a pump arch (1) rotatably connected to an external gear and an internal gear meshed with each other. The internal part of the pump arch (1) is connected to a fixed shaft arranged concentrically with the pump arch (1). The external gear is connected to the fixed shaft and is arranged concentrically with the pump arch (1). The fixed shaft includes a connecting section whose outer circumferential lateral portion is provided with an eccentricity calibration element. The eccentricity calibration element and the connecting section form an eccentric integrated body. The internal gear is rotatably arranged about a geometric central axis of the eccentric integrated body, and the eccentric integrated body is arranged non-concentrically with the pump arch (1). Figure to be published with the abbreviation: Figure 1.

Description

Title of the invention: Electronic oil pump technical field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to an electronic oil pump with a high-precision design. TECHNICAL CONTEXT

[0002] With the rapid development of automotive electronics and new energy vehicles, the integrated electronic oil pump with a high-precision design has been increasingly used due to its high efficiency, energy savings, and control flexibility. In conventional technology, an integrated electronic oil pump mainly consists of three components: a controller, a motor, and a rotor gear pump, in which the rotor gear pump comprises a pump arch and a set of gears.The gear set consists of an external gear and an internal gear meshed together and arranged within the pump housing. The internal gear is connected to the pump housing via a fixed shaft. The internal gear is eccentrically positioned relative to the external gear, and the motor rotor is integrated with the external gear to form the integrated body of the motor rotor and gear pump. An electrical circuit control module sends control signals to the motor. The electromagnetic force of the motor stator interacts with the permanent magnetic force of the motor rotor to drive the motor rotor to rotate. The integrated body of the motor rotor and gear pump rotates synchronously, and the external gear of the pump drives the internal gear to rotate.A plurality of sealed oil loading / discharging cavities are formed between the inner and outer gears by eccentric meshing. The inner and outer gears of the rotor rotate in a predetermined direction, and the volume of the sealed oil loading / discharging cavity increases stage by stage, then decreases stage by stage, resulting in an alternating increase and decrease in the volume of oil pumped and expelled from the sealed oil loading / discharging cavity. Furthermore, as the volume of the sealed oil loading / discharging cavity increases stage by stage, the sealed oil loading / discharging cavity connects and communicates with an oil inlet port of the pump arch, and as the volume of the sealed oil loading / discharging cavity decreases stage by stage, the sealed oil loading / discharging cavity connects and... communicates with an oil outlet port of the pump arch, thus forming an oil circuit in the electronic oil pump.

[0003] At present, traditional electronic oil pumps have a problem of low accuracy in controlling the concentricity of the fixed shaft, the pump arch and the motor. DISCLOSURE OF THE INVENTION

[0004] In view of this, the present application aims to provide an electronic oil pump with a high-precision design to improve the control accuracy of the concentricity of the fixed shaft, pump arch and motor rotor.

[0005] The electronic oil pump supplied by this application adopts the following technical solution:

[0006] According to a first aspect, the present application provides an electronic oil pump with a high-precision design, comprising a pump arch, in which the pump arch is rotationally connected to an external gear and an internal gear meshed with each other, the inside of the pump arch is connected to a fixed shaft arranged concentrically with the pump arch, the external gear is connected to the fixed shaft and the external gear is arranged concentrically with the pump arch;The fixed shaft includes a connecting section; the outer circumferential lateral part of the connecting section is provided with an eccentricity calibration element; the eccentricity calibration element and the connecting section form an eccentric integrated body; the internal gear is arranged rotatably around a geometric central axis of the eccentric integrated body; and the eccentric integrated body is arranged non-concentrically with the pump arch.

[0007] By adopting the above technical solution, a single fixed shaft is arranged in the pump arch, and then the eccentricity calibration element is arranged on the circumferential side wall of the fixed shaft to form the integrated eccentric body. The eccentricity calibration element can compensate for the concentricity deviation caused by the machining and assembly of multiple parts such as the pump arch, the fixed shaft, and the motor, thus effectively ensuring the concentricity of the pump arch, the fixed shaft, and the motor. In this way, when the external gear is rotationally connected to the fixed shaft, the integrated eccentric body can be rotationally connected to the internal gear, thus providing the effect that the internal and external gears are coaxial and eccentric.Simultaneously, because the fixed shaft is arranged concentrically with the pump arch, the motor rotor can achieve, with the help of the fixed shaft, a high concentricity with respect to the fixed shaft and the pump arch, which allows... to effectively compensate for the problem of low concentricity accuracy caused by the accumulation of tolerances during machining and assembly.

[0008] It is necessary to provide a single hole on the pump arch to fit the fixed shaft, which makes it possible to effectively reduce the complexity of machining the pump arch, increase the efficiency of machining the pump arch and increase the accuracy of the fit between the external gear and the internal gear of the rotor pump.

[0009] Optionally, the eccentricity calibration element is a half-moon sleeve disposed on the circumferential outer wall of the fixed shaft, and the half-moon sleeve is provided with an arc groove into which the fixed shaft can be inserted.

[0010] By adopting the above technical solution, the circumferential side wall of the fixed shaft is partially inserted into the arc groove, so that the circumferential side wall of the fixed shaft and the circumferential outer wall of the half-moon sleeve form an integrated eccentric body rotatably connected to the inner gear, which makes it possible to provide the effect that the inner gear and the outer gear are coaxial and eccentric, to achieve the coaxiality and eccentricity effect between the inner gear and the outer gear, to effectively compensate for the problem of low eccentricity accuracy of the center and axial center of the motor caused by the accumulation of tolerances during machining and assembly, and also to guarantee the mutual drive between the inner gear and the outer gear of the rotor pump based on the centrifugal design.

[0011] Optionally, an upper end of the fixed shaft is provided without backlash with a bearing, the internal gear includes an inner circle of internal gear fitting coaxially to the fixed shaft and bearing against the eccentric integrated body, an inner circle of motor rotor is axially arranged to bear against an outer circle of external gear, the upper part (also called the neck of the motor rotor) of the outer circle of motor rotor is provided with an inner circle fitting without backlash to the outer circle of the bearing, the eccentric integrated body fits to the fixed shaft through a shaft sleeve, and the shaft sleeve fits to the inner circle of internal gear.

[0012] By adopting the above technical solution, the mounting of the fixed shaft and the pump arch in the existing art is achieved by providing a bearing at the bottom of the pump arch, in which the fixed end of the fixed shaft passes through the bearing and is connected by threading to a nut. The nut bears against an end face of the bearing, and a frictional force is generated by the nut bearing against the bearing, thus creating a fixed connection between the fixed shaft and the pump arch. However, the degree of tightening of the nut during mounting will affect the play of the axial end face of the Pump body. During operation, the temperature inside the pump arch increases, and due to the different coefficients of thermal expansion of the materials of the pump arch, the fixed shaft, and the nut (for example, the aluminum material of the pump arch, the stainless steel material of the fixed shaft, and the steel material of the nut), the clearance of the axial end face will change, affecting the performance of the pump body. In this application, the bearing and nut in the pump arch are eliminated. One end of the fixed shaft passes directly through the pump arch for a backlash-free fit, and the other end fits backlash-free against the inner peripheral face of the bearing. This end fit completely limits the insertion depth of the fixed shaft in the housing.This simplified structure proposed in this application effectively avoids the influence of multiple interfaces such as the fixed shaft, bearing, and nut, and the accumulation of multiple tolerances in existing designs. The fixed shaft is directly adapted to penetrate the bottom of the pump arch, which reduces the influence of thermal expansion of different materials caused by temperature reduction on the clearance of the axial and radial end faces of the pump body, thus improving the working efficiency of the pump body.

[0013] The circumferential inner wall of the motor rotor neck of the motor rotor outer circle is clamped to the circumferential outer wall of the bearing, thereby establishing a rotational connection between the outer gear and the fixed shaft. The shaft sleeve between the half-moon sleeve and the fixed shaft not only clamps the half-moon sleeve and the fixed shaft but also establishes a rotational connection to the inner gear. The circumferential outer wall of the shaft sleeve bears against the circumferential inner wall of the inner gear, thereby establishing a rotational connection between the eccentric integrated body and the inner gear;

[0014] In the existing art, the rotary connection between the external gear and the pump casing is achieved by permanently fitting a large-radius bearing onto the circumferential outer wall of the external gear, in which the circumferential outer wall of the bearing is fixed within the pump casing. However, due to the large radius of the bearing, it often causes significant mechanical wear during operation, reducing its service life and requiring frequent replacement, which affects the pump's working efficiency and increases production costs. According to the present application, the compact bearing fits closely onto the fixed shaft and the rotor neck of the motor, thereby effectively reducing mechanical friction, improving the pump's working efficiency, and also reducing production costs.

[0015] Optionally, an inner ring of outer gear, the outer ring of motor rotor and the inner gear are enclosed to form a plurality of oil loading-unloading cavities, the volume of the oil loading-unloading cavity increases stage by stage according to the direction of rotation of the outer gear, then decreases stage by stage, the pump arch is provided with an oil inlet orifice and an oil outlet orifice, when the volume of the oil loading-unloading cavity increases stage by stage, the outlet of the oil loading-unloading cavity corresponds to the oil inlet orifice, and when the volume of the oil loading-unloading cavity decreases stage by stage, the outlet of the oil loading-unloading cavity corresponds to the oil outlet orifice.

[0016] By adopting the above technical solution, the circumferential inner wall of the outer gear's inner circle, the inner end face of the outer gear's outer circle, and the circumferential outer wall of the inner gear are enclosed to form a plurality of oil loading and unloading cavities that are closed. When the inner and outer gears rotate relative to each other, the oil loading and unloading cavity, as its volume increases stage by stage, is filled with oil through the oil inlet orifice. The amount of oil in the oil loading and unloading cavity increases with the volume, and the low-temperature oil during loading comes into contact with the teeth of the inner and outer gears and thus absorbs heat from the teeth.The oil loading / unloading cavity, as its volume decreases stage by stage, is discharged of oil through the oil outlet port. The amount of oil in the oil loading / unloading cavity decreases with the volume. The high-temperature oil that absorbed heat during loading is expelled from the pump body through the oil outlet port, thus achieving cooling and lubrication of the internal and external gears and cooling of the pump body, and ensuring the temperature and working efficiency of the pump.

[0017] Optionally, the pump arch is provided with a pump arch bottom covering the oil inlet port and the oil outlet port, the pump arch bottom is provided with a fixing hole fixedly connected to one end of the fixed shaft, the pump arch bottom is provided with an oil loading port in communication with the oil inlet port and an oil discharge port in communication with the oil outlet port, the pump arch bottom is provided with a separating portion to separate the oil loading port and the oil discharge port, and one side of the separating portion rests on one side of the internal gear.

[0018] By adopting the above technical solution, the separating portion effectively separates the oil loading port and the oil discharge port, thus ensuring contact time between the oil and the inner and outer gears, and improving the cooling effect through heat exchange. One side of the separating portion rests against one side of the inner gear to ensure the sealing of the oil loading / discharging cavity.

[0019] Optionally, a positioning hole is provided on one side of the half-moon sleeve and an assembly guide hole corresponding to the positioning hole is provided at the bottom of the pump arch.

[0020] By adopting the above technical solution, during the mounting of the inner gear and the outer gear, a pin shaft is used for fixing on a positioning hole and passes through a guide hole, which achieves the positioning of the inner gear, plays a guiding role for the mounting of the fixed shaft, promotes the reduction of the eccentricity error of the inner gear and the outer gear, and increases the accuracy of the fit between the inner gear and the outer gear.

[0021] By arranging the positioning hole on the eccentricity calibration element and a corresponding assembly guide hole on a boss at the bottom of the pump arch, it is possible to reduce the eccentricity of the motor, pump arch and fixed shaft caused by the accumulation of tolerances from machining and assembly of various parts such as the motor, shaft, pump arch and gear pump, effectively improves the air clearance between the stator and motor rotor and the radial clearance of the pump body system, and also improves the assembly accuracy of the internal and external gears of the rotor pump.

[0022] Optionally, the pump arch is provided with a filter grid which is positioned at the oil inlet orifice and covers the oil inlet orifice.

[0023] By adopting the above technical solution, the filter grid can filter the oil passing through the oil inlet orifice and reduce the influence of impurities contained in the oil on the work of the pump.

[0024] Optionally, a motor rotor and an electrical circuit control module may also be provided, the electrical circuit control module includes a controller and a wire collector arranged in the pump arch and a motor stator arranged on the wire collector, the motor stator is provided, along its own circumference, with a plurality of stator winding coils, the motor rotor is sleeved on the circumferential outer circle of the outer gear and the circumferential outer wall of the motor rotor corresponds to the circumferential inner wall of the motor stator.

[0025] By adopting the above technical solution, the controller commands the wire collector to energize the plurality of stator winding coils on the motor stator. Once energized, the plurality of stator winding coils generate the magnetic field. This magnetic field and the permanent magnetic field of the rotor magnet interact to drive the outer gear pump of the motor rotor to rotate. The motor rotor is integrated onto the outer rotor of the gear pump; that is, the motor stator and the rotor magnet interact to drive the gear pump of the outer gear of the rotor to rotate. The outer gear of the gear pump of the rotor then drives the inner gear to rotate, thus achieving a relative rotation between the inner gear and the outer gear.

[0026] Optionally, an air gap is provided between the circumferential outer wall of the motor rotor and the circumferential inner wall of the motor stator.

[0027] By adopting the above technical solution, a reserved clearance can be called an air gap, and the air gap reduces the contact between the motor rotor and the stator winding coil, reduces friction, promotes relative rotation between the outer and inner gears, and reduces vibrations generated by noise and friction. This design optimizes the rotor magnet geometry, reduces the air gap between the rotor and the motor stator windings, and reduces tooth groove torque and magnetic hysteresis during motor starting and switching, resulting in smoother motor rotation and reduced noise and vibration.

[0028] Optionally, the pump arch is provided with a housing to separate the controller and the wire collector.

[0029] By adopting the above technical solution, the housing can separate the oil circuit and the electrical control part, improve sealing and ensure the operation of the controller at an appropriate temperature.

[0030] Of all that is described above, the present application has at least one of the following technical benefits:

[0031] 1. By arranging a single fixed shaft in the pump arch and arranging an element eccentricity calibration on the circumferential side wall of the fixed shaft to form an eccentric integrated body, when the outer gear is rotationally connected to the fixed shaft, in parallel, the eccentric integrated body can be rotationally connected to the inner gear, which makes it possible to achieve the coaxiality and eccentricity effect between the inner and outer gears, to effectively compensate for the eccentricity of the center and axial center of the motor caused by the accumulation of tolerances during machining and assembly, and also to ensure the mutual drive between the inner and outer gears of the rotor pump based on the centrifugal design;

[0032] 2. For mounting the fixed shaft and the pump arch, the bearing and the nut in The pump arch is eliminated in this application; one end of the fixed shaft passes directly through the pump arch for a backlash-free fit, and the other end is fixed by a bearing to limit the insertion depth of the fixed shaft in the housing, effectively avoiding the influence of multiple interfaces such as the fixed shaft, bearing, and nut, and the accumulation of multiple tolerances in the existing art design, and reducing the influence of the thermal expansion of different materials caused by the temperature reduction on the air clearance of the axial end face of the pump body, thus improving the working efficiency of the pump body;

[0033] 3. The circumferential inner wall of the motor rotor neck of the outer circle The outer gear is clamped to the circumferential outer wall of the bearing, thus creating a rotational connection between the outer gear and the stationary shaft. The shaft sleeve not only clamps the half-moon sleeve and the stationary shaft, but also creates a rotational connection to the inner gear. The circumferential outer wall of the shaft sleeve rests against the circumferential inner wall of the inner gear, thus creating a rotational connection between the eccentric integrated body and the inner gear.

[0034] 4. For the connection between the external gear and the pump arch, according to the present In demand, the compact bearing fits closely to the fixed shaft and the neck of the electronic rotor, which effectively reduces mechanical friction, improves the working efficiency of the pump and reduces production costs;

[0035] 5. For mounting the internal gear and the external gear, a shaft to The pin is used for fixing on a positioning hole and passes through a guide hole, which achieves the positioning of the inner gear, plays a guiding role for the mounting of the fixed shaft, promotes the reduction of the eccentricity error of the inner and outer gears, and increases the accuracy of the fit between the inner and outer gears.The positioning hole designed on the eccentricity calibration element and the positioning hole on a boss at the bottom of the pump arch form a shaft assembly guide hole, which reduces the eccentricity of the motor center, and of the center and axial center of the pump arch caused by the accumulation of machining and assembly tolerances of various parts such as the motor, shaft, pump arch and gear pump, effectively improves the air clearance between the motor stator and rotor and the radial clearance of the pump body system, and also improves the assembly accuracy of the internal and external gears of the rotor pump. DESCRIPTION OF THE FIGURES

[0036] [Fig. 1] is a general structural diagram according to the embodiments of the present application;

[0037] [Fig.2] is a structural diagram of the electrical circuit control module, the external gear and the internal gear according to the embodiments of the present application;

[0038] [Fig.3] is a general cross-sectional diagram according to the embodiments of the present application;

[0039] [Fig.4] is a partial cross-sectional diagram according to the embodiments of the present application;

[0040] [Fig.5] is a structural diagram of the motor stator according to the embodiments of the present application;

[0041] [Fig.6] is a structural diagram of the bottom of the pump arch according to the embodiments of the present application;

[0042] [Fig.7] is a structural diagram of the external gear and the internal gear according to the embodiments of the present application;

[0043] [Fig.8] is a structural diagram of the eccentricity calibration element according to the embodiments of the present application.

[0044] In the figures, the reference numerals are as follows: 1 - Pump arch; 11 - Oil inlet port; 12 - Oil outlet port; 13 - Pump arch bottom; 131 - Mounting hole; 132 - Oil fill port; 133 - Oil discharge port; 134 - Separation portion; 135 - Assembly guide hole; 14 - Filter screen; 15 - Housing; 16 - Air gap; 2 - External gear; 21 - Oil fill / discharge cavity; 22 - Motor rotor neck; 23 - External gear inner circle; 24 - Motor rotor outer circle; 3 - Internal gear; 4 - Fixed shaft; 41 - Eccentric integrated body; 5 - Eccentricity calibration element; 51 - Arc groove; 52 - Positioning hole; 6 - Bearing; 7 - Shaft sleeve; 8 - Motor rotor; 9 - Electrical circuit control module; 91 - Controller; 92 - Wire collector; 93 - Motor stator; 94 - Stator winding. DETAILED DESCRIPTION OF THE INVENTION

[0045] The present application will be described in more detail below with reference to Figures 118. The embodiments of the present application disclose an electronic oil pump with a high-precision design.

[0046] With reference to Figures 1 and 2, an electronic oil pump with a high-precision design is illustrated, which includes a pump arch 1, a motor, an electrical circuit control module 9, and a gear set, in which the motor includes a motor rotor 8, a motor stator 93, and stator windings 94, the motor stator 93 being fixed in the pump arch 1, the motor rotor 8 is disposed in the motor stator 93, the stator windings 94 being arranged in several groups, which are distributed in a circular network, are wound on the motor stator 93, and are located between the motor rotor 8 and the motor stator 93.

[0047] In which the gear set comprises an external gear 2 integrated and fixed to the motor rotor 8 and an internal gear 3 located in the external gear 2 and meshed with the internal teeth of the external gear 2.

[0048] In the operating process, the electrical circuit control module 9 commands the plurality of stator windings 94 to be energized, then a magnetic field is generated, and the generated magnetic field and the permanent magnetic field of the motor rotor magnet 8 interact to cause the motor rotor 8 to rotate. The motor rotor 8 is fixed relative to the external gear 2, i.e., the motor stator 93 and the motor rotor magnet 8 interact to cause the external gear 2 to rotate, and the external gear 2 then causes the internal gear 3 to rotate, thus achieving relative rotation between the internal gear 3 and the external gear 2.

[0049] With reference to Figures 3 and 4, the electrical circuit control module 9 comprises: a wire collector 92 disposed in the pump arch 1 and located above the motor, and a controller 91 located above the wire collector 92. The function of the wire collector 92 is to collect the incoming and outgoing wires from the stator windings 94, so that the distribution of the wire ends is regular and neat, and the wire ends are soldered to the wire collector 92 by a simple and straightforward method. Another function of the wire collector 92 is to separate the controller 91 from the motor section, so that oil circulates only within the motor section, forming a cooling and lubrication circuit, and no oil enters the controller 91.

[0050] The external gear 2 comprises: an inner outer gear ring 23 meshed with the inner gear 3, and an inner motor rotor ring fixedly sleeved to the outer outer gear ring. The permanent magnet of the motor rotor 8 is fixed to the circumference of the outer motor rotor ring 24, and an air gap 16 is provided between the permanent magnet of the motor rotor 8 and the stator winding 94. During the development process, it is necessary to minimize the influence of various factors on the distance stability of the air gap 16. The top of the outer motor rotor ring 24 is provided with a motor rotor neck 22, which is made in one piece, and a bearing 6 is installed in the motor rotor neck 22.

[0051] With reference to Figures 5 and 6, the bottom of the pump arch 1 is provided with a fixing hole 131 and the fixing hole 131 is arranged concentrically with the pump arch 1. A fixed shaft 4 is provided through the fixing hole 131, the fixed shaft 4 fits tightly to the bearing 6 and the motor rotor neck 22 is made as a single piece on one side of the external gear 2 and fits to the bearing 6.The internal gearing comprises an inner gear ring fitting coaxially to the fixed shaft 4 and bearing against the integrated eccentric body, an inner motor rotor ring is axially arranged to bear against the outer gear ring, a motor rotor neck 22 is formed as a single piece on one side of the outer motor rotor ring 24 and fits the bearing 6, the motor rotor neck 22 and one side of the outer motor rotor ring 24 form an insertion groove into which the bearing 6 can be inserted, and the circumferential outer wall of the bearing 6 fits closely against the circumferential wall of the insertion groove.

[0052] With reference to Figures 6 to 8, the circumferential inner wall of the outer gear inner circle 23 and the circumferential outer wall of the inner gear 3 both rest on the inner end face of the outer motor rotor circle 24, the area between the outer gear 2 and the inner gear 3 is divided by the contact between the teeth to form a plurality of oil loading-unloading cavities 21 which are closed, the volume of the oil loading-unloading cavity 21 increases stage by stage according to the direction of rotation of the outer gear 2 and then decreases stage by stage, an oil inlet orifice 11 is made in one piece on the bottom of the pump arch 1 and an oil outlet orifice 12 is made in one piece on the circumferential outer wall.When the volume of the oil loading-unloading cavity 21 increases stage by stage, the oil loading-unloading cavity 21 corresponds to the oil inlet port 11, and when the volume of the oil loading-unloading cavity 21 decreases stage by stage, the oil loading-unloading cavity 21 corresponds to the oil outlet port 12, and the bottom of the pump arch 1 is provided with a filter grid 14 which is positioned at the level of the oil inlet port 11 and covers the oil inlet port 11.

[0053] The bottom of the pump arch 1 is provided with a pump arch bottom 13 which is made in one piece and covers the oil inlet port 11 and the oil outlet port 12. The end face of the pump arch bottom 13 is axially provided with a mounting hole 131 which is fixedly connected to one end of the fixed shaft 4. The fixed shaft 4 is inserted into the mounting hole 131, and the circumferential outer wall of the fixed shaft 4 fits tightly against the wall of the mounting hole 131. The end face of the pump arch bottom 13 is provided with an oil loading port 132 in communication with the oil inlet port 11 and an oil discharge port 133 in communication with the port oil outlet 12. Once provided with the oil loading port 132 and the oil discharge port 133, the pump arch bottom 13 is formed of a separating portion 134 to separate the oil loading port 132 and the oil discharge port 133, and one side of the separating portion 134 rests on one side of the internal gear 3 to improve the seal between the oil loading port 132 and the oil discharge port 133.

[0054] A positioning hole 52 is provided on one side of the half-moon sleeve, an assembly guide hole 135 corresponding to the positioning hole 52 is provided at the bottom of the pump arch 13, and the assembly guide hole 135 and the fixing hole 131 are arranged eccentrically.

[0055] The principle of implementation of the electronic oil pump with high-precision design according to the embodiments of the present application is as follows:

[0056] A single fixed shaft 4 is disposed in the pump arch 1, then an eccentricity calibration element 5 is disposed on the circumferential side wall of the fixed shaft 4 to form an eccentric integrated body 41, in this way, when the external gear 2 is rotationally connected to the fixed shaft 4, in parallel, the eccentric integrated body 41 can be rotationally connected to the internal gear 3, thus providing the effect that the internal gear 3 and the external gear 2 are coaxial and eccentric.

[0057] A hole is provided on the pump arch 1 to fit the fixed shaft 4, which makes it possible to effectively reduce the complexity of machining the pump arch 1, increase the efficiency of machining the pump arch 1 and increase the accuracy of the fit between the external gear 2 and the internal gear 3.

[0058] The controller 91 commands the wire collector 92 to energize the plurality of stator winding coils 94 on the motor stator 93; once energized, the plurality of stator windings 94 generates the magnetic field to drive the motor rotor 8 to rotate, and the motor stator 93 drives the outer gear 2 to rotate, thus achieving a relative rotation between the inner gear 2 and the outer gear 3.

[0059] When the inner gear 3 and the outer gear 2 rotate relative to each other, the oil loading / unloading cavity 21, as its volume increases stage by stage, is filled with oil through the oil inlet orifice 11. The amount of oil in the oil loading / unloading cavity 21 increases with the volume, and the low-temperature oil during filling comes into contact with the teeth of the inner gear 3 and the outer gear 2 and thus absorbs heat from the teeth. When the oil loading / unloading cavity 21 decreases stage by stage, the oil is discharged through the oil outlet orifice 12. The amount of oil in the loading / unloading cavity The oil 21 decreases with the volume, the high-temperature oil which has absorbed heat during loading is expelled through the oil outlet 12, thus achieving cooling and lubrication of the inner gear 3 and the outer gear 2 and cooling of the pump body.

[0060] The embodiments below are preferred and non-limiting embodiments for the purposes of this application; therefore, any equivalent modifications respecting the structures, forms and principles of this application must be included within the scope of this application.

Claims

Demands

1. Electronic oil pump, comprising a pump arch (1), characterized in that, the pump arch (1) is rotationally connected to an external gear (2) and an internal gear (3) meshed with each other, the inside of the pump arch (1) is connected to a fixed shaft (4) arranged concentrically with the pump arch (1), the external gear (2) is connected to the fixed shaft (4) and the external gear (2) is arranged concentrically with the pump arch (1);the fixed shaft (4) includes a connecting section, the outer circumferential lateral part of the connecting section is provided with an eccentricity calibration element (5), the eccentricity calibration element (5) and the connecting section form an eccentric integrated body (41), the internal gear (3) is arranged rotatably about a geometric central axis of the eccentric integrated body (41) and the eccentric integrated body (41) is arranged non-concentrically with the pump arch (1).;

2. Electronic oil pump according to claim 1, characterized in that the eccentricity calibration element (5) is a half-moon sleeve disposed on the circumferential outer wall of the fixed shaft (4), and the half-moon sleeve is provided with an arc groove (51) into which the fixed shaft (4) can be inserted.

3. Electronic oil pump according to claim 1, characterized in that, one end of the fixed shaft (4) is provided in a backlash-free manner with a bearing (6), the internal gear (3) comprises an inner circle of internal gear fitting coaxially with the fixed shaft (4) and bearing against the eccentric integrated body (41), an inner circle of motor rotor is axially arranged to bear against an outer circle of external gear, the upper part of the outer circle of motor rotor (24) is provided with an inner circle fitting in a backlash-free manner with the outer circle of the bearing (6), the eccentric integrated body (41) fits the fixed shaft (4) through a shaft sleeve (7), and the shaft sleeve (7) fits the inner circle of internal gear.

4. Electronic oil pump according to claim 3, characterized in that an inner outer gear ring (23), the outer motor rotor ring (24) and the inner gear (3) are enclosed to form a plurality of loading cavities- oil discharge (21), the volume of the oil loading-discharging cavity (21) increases stage by stage according to the direction of rotation of the external gear (2), then decreases stage by stage, the pump arch (1) is provided with an oil inlet port (11) and an oil outlet port (12), when the volume of the oil loading-discharging cavity (21) increases stage by stage, the outlet of the oil loading-discharging cavity (21) corresponds to the oil inlet port (11), and when the volume of the oil loading-discharging cavity (21) decreases stage by stage, the outlet of the oil loading-discharging cavity (21) corresponds to the oil outlet port (12).

5. Electronic oil pump according to claim 4, characterized in that, the pump arch (1) is provided with a pump arch bottom (13) covering the oil inlet port (11) and the oil outlet port (12), the pump arch bottom (13) is provided with a mounting hole (131) fixedly connected to one end of the fixed shaft (4), the pump arch bottom (13) is provided with an oil loading port (132) in communication with the oil inlet port (11) and an oil discharge port (133) in communication with the oil outlet port (12), the pump arch bottom (13) is provided with a separating portion (134) for separating the oil loading port (132) and the oil discharge port (133), and one side of the separating portion (134) rests on one side of the internal gear (3).

6. Electronic oil pump according to claim 5, characterized in that, a positioning hole (52) is provided on one side of the half-moon sleeve and an assembly guide hole (135) corresponding to the positioning hole (52) is provided at the bottom of the pump arch (13).

7. Electronic oil pump according to claim 4, characterized in that the pump arch (1) is provided with a filter grid (14) which is positioned at the level of the oil inlet orifice (11) and covers the oil inlet orifice (11).

8. An electronic oil pump according to claim 1, characterized in that it comprises, in addition to a motor rotor (8) and an electrical circuit control module (9), the electrical circuit control module (9) comprises a controller (91) and a wire collector (92) arranged in the pump arch (1) and a motor stator (93) disposed on the wire collector (92), the motor stator (93) is provided, along its own circumference, with a plurality of stator winding coils (94), the motor rotor (8) is sleeved on the circumferential outer circle of the outer gear (2) and the circumferential outer wall of the motor rotor (8) corresponds to the circumferential inner wall of the motor stator (93).

9. Electronic oil pump according to claim 8, characterized in that 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).

10. Electronic oil pump according to claim 8, characterized in that the pump arch (1) is provided with a housing (15) to separate the controller (91) and the wire collector (92).

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