Electronic oil pump based on oil cooling motor

Abstract

The invention relates to an electronic oil pump based on an oil-cooled motor, and relates to the field of electronic oil pumps. According to the technical scheme, negative pressure generated by meshing operation of the inner rotor and the outer rotor is combined with a communication path of the oil inlet, the central oil duct hole and the motor cavity to accelerate oil liquid to flow into the motor cavity and fully circulate, so that the oil liquid efficiently infiltrates the stator, the rotor and the controller of the permanent magnet motor and quickly takes away heat, the heat dissipation efficiency of the motor and the controller is remarkably improved, and the service life of the motor is prolonged. The operation stability is prevented from being influenced by overheating; moreover, the oil in the motor cavity circulates sufficiently, the problem of local oil retention is eliminated, it is ensured that oil temperature data collected by the controller can truly reflect the overall oil temperature of the system, and the problem of large deviation of the oil temperature data is effectively solved; in addition, an additional oil drainage structure on the high-pressure side of the rotor cavity is omitted, invalid oil loss is reduced, more oil can be output from the oil outlet through the high-pressure oil cavity, and the volume efficiency of the oil pump is improved to a certain degree.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic oil pumps, in particular to an electronic oil pump based on an oil-cooled motor. BACKGROUND

[0002] The electronic oil pump is the core component of the cooling and lubrication system of the electric drive system, and needs to work cooperatively with the oil circuit, heat exchanger, filter and other structures in the system to jointly ensure the stable operation of the electric drive system. Its functions include: receiving command signals from the upper control system, outputting lubricating oil with flow and pressure meeting the requirements of the working condition; at the same time, real-time feedback of the running state to the upper system is formed to form a closed loop control. The main structure of the device includes the controller, the permanent magnet motor, the inner rotor and the outer rotor, as well as the rotor cavity, the motor cavity and the controller cavity for accommodating the components, in addition to the packaging structures such as the pump cover and the controller cover. When working, the controller outputs a driving current to the permanent magnet motor, which drives the inner rotor to rotate. The inner rotor and the outer rotor are arranged eccentrically, and a plurality of closed chambers are formed between the inner rotor and the outer rotor. The inner rotor rotates synchronously to drive the outer rotor to rotate in the same direction. In this process, the closed chambers rotate with the rotors and the volume changes periodically, thereby realizing the pumping action of oil suction and oil pressure. In order to achieve heat dissipation, the rotor cavity is divided into a low-pressure oil inlet area and a high-pressure oil outlet area. The system draws oil from the high-pressure oil outlet area to the motor cavity, and then returns the oil from the low-pressure oil inlet area to the external oil circuit, so as to cool the permanent magnet motor and the controller, and ensure that the electronic oil pump works within the set temperature range.

[0003] However, the design of the existing electronic oil pump still has obvious technical shortcomings. The cooling method of drawing oil from the high-pressure oil outlet area to the motor cavity directly occupies the effective output oil of the oil pump, resulting in a significant decrease in the volumetric efficiency of the oil pump. In addition, the oil circulation path design in the motor cavity is not reasonable, the oil flow is not sufficient, and the heat generated by the permanent magnet motor and the controller during operation cannot be efficiently taken away, resulting in low heat dissipation efficiency and affecting the long-term operation stability of the device. Especially for the electronic oil pump with the controller integrated with an oil temperature sensor, insufficient oil circulation will cause the oil temperature in the detection area of the sensor to not truly reflect the overall oil temperature of the system, and the continuous heating of the motor will further interfere with the detection environment, eventually causing a large deviation of the oil temperature detection result, affecting the accurate judgment and control of the working condition by the upper system. SUMMARY

[0004] The purpose of the present application is to provide an electronic oil pump based on an oil-cooled motor to solve the problems existing in the prior art.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is: An electronic oil pump based on an oil-cooled motor, comprising: The pump body has a rotating shaft rotatably mounted inside. The rotating shaft has a central oil passage hole. A permanent magnet motor rotor is sleeved on the first end of the rotating shaft. A permanent magnet motor stator is fixed on the pump body on the outside of the permanent magnet motor rotor. An inner rotor is sleeved on the second end of the rotating shaft. An outer rotor is sleeved on the outer periphery of the inner rotor. A controller with an insulating layer coated on its surface is also provided on one side of the permanent magnet motor stator and the permanent magnet motor rotor. A pump cover, installed on one side of the pump body, forms a low-pressure oil chamber and a high-pressure oil chamber with the pump body, and has an oil inlet and an oil outlet; and A controller cover is installed on the other side of the pump body, and forms a motor cavity with the pump body; The oil inlet is connected to the central oil passage hole, the central oil passage hole is connected to the motor cavity, the motor cavity is connected to the low-pressure oil cavity, the low-pressure oil cavity is connected to the high-pressure oil cavity, and the high-pressure oil cavity is connected to the oil outlet.

[0006] In some embodiments, the oil inlet, the central oil passage hole, the motor cavity, the gap between the permanent magnet motor rotor and the permanent magnet motor stator, the low-pressure oil cavity, the interior of the inner rotor and the outer rotor, the high-pressure oil cavity, and the oil outlet constitute the oil cooling path of the electronic oil pump based on the oil-cooled motor.

[0007] In some embodiments, the controller cover has an electrical interface for electrically connecting the controller to an external control system and the controller to the stator of the permanent magnet motor.

[0008] In some embodiments, an insulating bracket is mounted on the stator of the permanent magnet motor, and the controller is fixed on the insulating bracket.

[0009] In some embodiments, the insulating bracket is a plastic component, and the controller is fixed to the insulating bracket by plastic heat riveting.

[0010] In some embodiments, the oil inlet is located on the end face of the pump cover, and the oil outlet is located on the side of the pump cover.

[0011] In some embodiments, the shaft located between the permanent magnet motor rotor and the inner rotor is rotatably connected to the pump body via a sliding bearing.

[0012] In some implementations, the insulating layer coated on the surface of the controller needs to have oil resistance, high temperature resistance, and electrical insulation properties.

[0013] In some embodiments, the insulating layer coated on the surface of the controller includes at least one of epoxy resin insulating coating, polyimide insulating coating, ceramic-based insulating coating, or silicone insulating coating.

[0014] The beneficial effects of the technical solution provided by this invention include at least the following: This technical solution utilizes the negative pressure generated by the meshing operation of the inner and outer rotors, combined with the connection path of the oil inlet, central oil passage, and motor cavity, to accelerate the flow of oil into the motor cavity and ensure full circulation. This allows the oil to efficiently wet the permanent magnet motor stator, rotor, and controller, quickly removing heat and significantly improving the heat dissipation efficiency of the motor and controller, preventing overheating from affecting operational stability. Furthermore, the thorough circulation of oil within the motor cavity eliminates localized oil stagnation, ensuring that the oil temperature data collected by the controller accurately reflects the overall system oil temperature, effectively solving the problem of large deviations in oil temperature data. In addition, the elimination of the additional oil drain structure on the high-pressure side of the rotor cavity reduces ineffective oil loss, allowing more oil to be output from the outlet through the high-pressure oil cavity, thus improving the volumetric efficiency of the oil pump to some extent. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0016] Figure 1 A schematic diagram of an electronic oil pump based on an oil-cooled motor, provided by an exemplary embodiment of the present invention, is shown.

[0017] Figure 2 A schematic diagram of the pump cover of an electronic oil pump based on an oil-cooled motor, provided by an exemplary embodiment of the present invention, is shown.

[0018] In the diagram: 1. Pump cover; 2. Pump body; 3. Permanent magnet motor stator; 4. Controller cover; 5. Controller; 6. Inner rotor; 7. Outer rotor; 8. Permanent magnet motor rotor; 9. Shaft; 810. Oil inlet; 811. Central oil passage hole; 812. Low-pressure oil chamber; 813. Oil outlet; 815. Electrical interface; 816. Motor chamber; 817. High-pressure oil chamber. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 The diagram illustrates a schematic of an electronic oil pump based on an oil-cooled motor, provided by an exemplary embodiment of the present invention. The pump includes: a pump body 2, inside which a rotating shaft 9 is rotatably mounted. The rotating shaft 9 has a central oil passage hole 811. A permanent magnet motor rotor 8 is fitted onto the first end of the rotating shaft 9. A permanent magnet motor stator 3, fixed to the pump body 2, is mounted on the outer side of the permanent magnet motor rotor 8. An inner rotor 6 is fitted onto the second end of the rotating shaft 9. An outer rotor 7 is fitted around the outer periphery of the inner rotor 6. An insulating layer is also coated on one side of the permanent magnet motor stator 3 and the permanent magnet motor rotor 8. The pump body 2 includes a controller 5; a pump cover 1, which is installed on one side of the pump body 2 and forms a low-pressure oil chamber 812 and a high-pressure oil chamber 817 with the pump body 2, and has an oil inlet 810 and an oil outlet 813; and a controller cover 4, which is installed on the other side of the pump body 2 and forms a motor chamber 816 with the pump body 2; wherein the oil inlet 810 is connected to the central oil passage hole 811, the central oil passage hole 811 is connected to the motor chamber 816, the motor chamber 816 is connected to the low-pressure oil chamber 812, the low-pressure oil chamber 812 is connected to the high-pressure oil chamber 817, and the high-pressure oil chamber 817 is connected to the oil outlet 813.

[0023] In this embodiment, the rotating shaft 9 is the power transmission hub. One end of the shaft is connected to the permanent magnet motor rotor 8, and the other end is connected to the inner rotor 6. When the permanent magnet motor rotor 8 is driven to rotate by the permanent magnet motor stator 3, the inner rotor 6 can be driven to rotate synchronously through the rotating shaft 9, so that the inner rotor 6 meshes with the outer rotor 7 to complete the oil suction and oil pressure actions.

[0024] In one example, see Figure 2The oil inlet 810 is located on the end face of the pump cover 1, and the oil outlet 813 is located on the side of the pump cover 1. The end face oil inlet shortens the path of the oil into the low-pressure oil chamber 812 and reduces the friction resistance during oil flow; the side oil outlet is more compatible with the radial position of the high-pressure oil chamber 817, and the oil can be directly output along the side pipeline after being discharged from the high-pressure oil chamber 817 without having to turn back inside the pump cover 1, reducing pressure loss and ensuring efficient oil delivery.

[0025] For details, please refer to Figure 1 The oil inlet 810, the central oil passage hole 811, the motor cavity 816, the gap between the permanent magnet motor rotor 8 and the permanent magnet motor stator 3, the low-pressure oil cavity 812, the interior of the inner rotor 6 and the outer rotor 7, the high-pressure oil cavity 817, and the oil outlet 813 constitute the oil cooling path of the electronic oil pump based on the oil-cooled motor.

[0026] In this embodiment, the oil is delivered from the inlet 810 through the central oil passage 811 to the motor cavity 816. The oil entering the motor cavity 816 can fully wet the permanent magnet motor rotor 8 and the permanent magnet motor stator 3, directly carrying away the heat generated during motor operation by flowing through the gap between them, thus solving the heat dissipation problem of the motor rotor and stator. Subsequently, the oil flows to the low-pressure oil cavity 812 and enters the inner rotor 6 and outer rotor 7, which can cool the high-speed meshing rotor components, reduce the heat generated by meshing friction, and reduce rotor wear with the help of oil lubrication. At the same time, the low-pressure environment can prevent the formation of air bubbles in the oil, ensuring the stability of the oil pumping process. The entire path maximizes the utilization of oil efficiency, avoids failure of local components due to untimely heat dissipation or insufficient lubrication, and significantly improves the operational stability and service life of the electronic oil pump.

[0027] For more details, please refer to Figure 1 The controller cover 4 has an electrical interface 815, which is used to electrically connect the controller 5 to an external control system and the controller 5 to the permanent magnet motor stator 3.

[0028] In this embodiment, an external control system (such as a vehicle ECU or equipment master control unit) can supply power and send operating condition commands to the controller 5 via electrical interface 815. For example, the controller 5 can adjust the motor speed to change the oil supply as needed, and can collect operating data such as motor current and oil temperature in real time, and transmit them back to the external system via the interface to realize real-time monitoring of the oil pump operating condition. The electrical connection between the controller 5 and the permanent magnet motor stator 3 ensures that the controller 5 can accurately control the on / off state, frequency, and magnitude of the stator winding current, thereby stabilizing the motor speed.

[0029] Specifically, an insulating bracket is mounted on the stator 3 of the permanent magnet motor, and the controller 5 is fixed to the insulating bracket. In one example, the insulating bracket is a plastic part, and the controller 5 is fixed to the insulating bracket by plastic heat riveting.

[0030] In this embodiment, the insulating bracket serves to achieve electrical isolation. Since both the controller 5 and the permanent magnet motor stator 3 are live components, the bracket can block accidental conductive paths between them, thus avoiding the risk of short circuits.

[0031] More specifically, the position on the rotating shaft 9 between the permanent magnet motor rotor 8 and the inner rotor 6 is rotatably connected to the pump body 2 via a sliding bearing.

[0032] In this embodiment, the rotating shaft 9 is connected to the pump body 2 via a sliding bearing between the permanent magnet motor rotor 8 and the inner rotor 6, which can provide support and drag reduction protection for the rotating shaft 9.

[0033] It is worth mentioning that the insulating layer coated on the surface of the controller 5 must have oil resistance, high temperature resistance, and electrical insulation properties. Optionally, the insulating layer coated on the surface of the controller 5 may include at least one of the following: epoxy resin insulating coating, polyimide insulating coating, ceramic-based insulating coating, or silicone insulating coating.

[0034] In this embodiment, since the controller 5 is located inside the motor cavity 816, it is in long-term contact with oil and affected by the heat generated by the permanent magnet motor. Oil resistance can prevent the insulation layer from swelling and aging due to oil and failing. High temperature resistance can resist softening and cracking caused by the temperature rise of the motor. Electrical insulation can block accidental conduction between the controller 5 and surrounding live parts, avoiding short circuit faults.

[0035] Next, the working principle of an electronic oil pump based on an oil-cooled motor involved in the embodiments of the present invention will be explained.

[0036] The external control system sends operating condition commands and supplies power to the controller 5 through the electrical interface 815 of the controller cover 4. The controller 5 precisely controls the winding current of the permanent magnet motor stator 3 based on the commands, so that the stator generates an alternating magnetic field, which drives the permanent magnet motor rotor 8 sleeved on the first end of the rotating shaft 9 to rotate. The rotating shaft 9 transmits the torque to the inner rotor 6 at the second end, which drives it to eccentrically mesh with the outer rotor 7 on the outer periphery. Meanwhile, the oil enters from the oil inlet 810 on the end face of the pump cover 1, and is directly transported to the motor cavity 816 through the central oil passage hole 811 inside the rotating shaft 9, fully immersing the permanent magnet motor stator 3 and permanent magnet motor rotor 8, and quickly carrying away the operating heat of the motor through the gap between them; then the oil flows into the low-pressure oil cavity 812 formed by the pump cover 1 and the pump body 2, and then enters the meshing area of ​​the inner rotor 6 and the outer rotor 7; as the inner rotor 6 and the outer rotor 7 rotate, the volume of the closed cavity formed by them changes periodically, and after completing the oil suction action, the oil is forced into the high-pressure oil cavity 817, and finally efficiently output from the oil outlet 813 on the side of the pump cover 1; Throughout the process, the insulating bracket on the permanent magnet motor stator 3 blocks any accidental conductive path between the controller 5 and the permanent magnet motor stator 3. Meanwhile, the oil synchronously completes the cooling and lubrication of the permanent magnet motor stator 3, permanent magnet motor rotor 8, inner rotor 6 and outer rotor 7 during the entire oil pumping process, achieving coordinated and efficient operation of power transmission, oil pumping function and heat dissipation and lubrication.

[0037] In summary, this technical solution utilizes the negative pressure generated by the meshing operation of the inner and outer rotors, combined with the connection path of the oil inlet, central oil passage, and motor cavity, to accelerate the flow of oil into the motor cavity and ensure its full circulation. This allows the oil to efficiently wet the permanent magnet motor stator, rotor, and controller, quickly removing heat and significantly improving the heat dissipation efficiency of the motor and controller, thus preventing overheating from affecting operational stability. Furthermore, the thorough circulation of oil within the motor cavity eliminates the problem of localized oil stagnation, ensuring that the oil temperature data collected by the controller accurately reflects the overall system oil temperature, effectively solving the problem of large deviations in oil temperature data. In addition, the elimination of the additional oil drain structure on the high-pressure side of the rotor cavity reduces ineffective oil loss, allowing more oil to be output from the outlet through the high-pressure oil chamber, thereby improving the volumetric efficiency of the oil pump to a certain extent.

[0038] In the embodiments disclosed in this invention, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this invention according to the specific circumstances.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An oil-cooled electric motor-based electronic oil pump characterized by, The application relates to an oil-cooled motor-based electronic oil pump. The pump body (2) is internally rotatably provided with a rotating shaft (9) having a central oil channel hole (811), the first end of the rotating shaft (9) is sleeved with a permanent magnet motor rotor (8), the outer side of the permanent magnet motor rotor (8) is provided with a permanent magnet motor stator (3) fixed on the pump body (2), the second end of the rotating shaft (9) is sleeved with an inner rotor (6), the outer periphery of the inner rotor (6) is sleeved with an outer rotor (7), and the permanent magnet motor stator (3) and the permanent magnet motor rotor (8) are further provided with a controller (5) with a surface coated with an insulating layer on one side; The pump cover (1) is installed on one side of the pump body (2) and forms a low-pressure oil cavity (812) and a high-pressure oil cavity (817) with the pump body (2), and has an oil inlet (810) and an oil outlet (813); and The controller cover (4) is installed on the other side of the pump body (2) and forms a motor cavity (816) with the pump body (2); The oil inlet (810) is communicated with the central oil channel hole (811), the central oil channel hole (811) is communicated with the motor cavity (816), the motor cavity (816) is communicated with the low-pressure oil cavity (812), the low-pressure oil cavity (812) is communicated with the high-pressure oil cavity (817), and the high-pressure oil cavity (817) is communicated with the oil outlet (813).

2. The oil-cooled electric motor-based electronic oil pump of claim 1, wherein, The oil inlet (810), the central oil channel hole (811), the motor cavity (816), the gap between the permanent magnet motor rotor (8) and the permanent magnet motor stator (3), the low-pressure oil cavity (812), the interiors of the inner rotor (6) and the outer rotor (7), the high-pressure oil cavity (817) and the oil outlet (813) constitute the oil cooling path of the oil-cooled motor-based electronic oil pump.

3. The oil-cooled electric motor-based electronic oil pump of claim 1, wherein, The controller cover (4) is provided with an electrical interface (815) for electrically connecting the controller (5) with an external control system, and the controller (5) is electrically connected with the permanent magnet motor stator (3).

4. The oil-cooled electric motor-based electronic oil pump of claim 1, wherein, The permanent magnet motor stator (3) is provided with an insulating support, and the controller (5) is fixed on the insulating support.

5. The oil-cooled electric motor-based electronic oil pump of claim 4, wherein, The insulating support is a plastic part, and the controller (5) is fixed on the insulating support through plastic hot riveting.

6. The oil-cooled electric motor-based electronic oil pump of claim 1, wherein, The oil inlet (810) is located on the end face of the pump cover (1), and the oil outlet (813) is located on the side face of the pump cover (1).

7. The oil-cooled electric motor-based electronic oil pump of claim 1, wherein, The position between the permanent magnet motor rotor (8) and the inner rotor (6) on the rotating shaft (9) is rotatably connected with the pump body (2) through a sliding bearing.

8. The oil-cooled electric motor-based electronic oil pump of claim 1, wherein, The insulating layer coated on the surface of the controller (5) needs to have oil resistance, high-temperature resistance and electrical insulation performance.

9. The oil-cooled electric motor-based electronic oil pump of claim 8, wherein, The insulating layer coated on the surface of the controller (5) at least includes one of an epoxy resin insulating coating, a polyimide insulating coating, a ceramic-based insulating coating and an organic silicon insulating coating.

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