Electric oil pump

Abstract

An electric oil pump (100), comprising: a motor assembly (10); a gear pump assembly (20), the gear pump assembly (20) being driven by the motor assembly (10) and being configured for pumping oil into the electric oil pump (100); and an electronic control assembly (30), comprising a busbar (31) and a temperature sensor (32), wherein in an axial direction of the electric oil pump (100), the busbar (31) is located between the motor assembly (10) and the gear pump assembly (20), and the temperature sensor (32) is disposed on a side of the busbar (31) close to the gear pump assembly (20) and is configured for measuring an oil temperature of the oil pumped into the electric oil pump (100) by the gear pump assembly (20).

Description

Electronic oil pump Technical Field

[0001] This invention relates to the field of automotive parts technology, and more particularly to an electronic oil pump. Background Technology

[0002] With the rapid development of the automotive industry, and as vehicle performance moves towards greater safety, reliability, stability, full automation, intelligence, and environmental protection and energy conservation, electronic oil pumps are widely used in automotive lubrication and cooling systems. For example, in the cooling system, the electronic oil pump delivers oil to the oil-water heat exchanger. Through convection heat exchange in the oil-water heat exchanger, the high-temperature oil is transformed into low-temperature oil, which then cools and lubricates the electric motor or transmission oil tank.

[0003] In actual thermal management control, accurate and real-time monitoring of the oil temperature after cooling circulation by the motor or transmission is crucial for calculating and controlling the oil flow rate of the electronic oil pump (such as during cold starts). Therefore, the accuracy of this temperature measurement directly affects the control effect.

[0004] In related technologies, electronic oil pumps typically include gear pump assemblies, motor assemblies (including motor stator and motor rotor), and electronic control assemblies. The manifolds of the gear pump assembly and electronic control assembly are usually located at both ends of the axial direction of the motor assembly. This means that the oil pumped by the gear pump assembly usually needs to flow through the stator and rotor of the motor assembly before it can flow to the vicinity of the temperature sensor integrated on the manifold, where the temperature sensor measures the temperature of the oil.

[0005] However, this design has the following problems: When the oil flows through the motor stator and rotor, it is heated by the heat generated by the stator or rotor, causing a significant difference between the oil temperature measured by the temperature sensor and the oil temperature immediately upon entering the electronic oil pump, affecting the accuracy of temperature measurement. Furthermore, the oil needs to flow through the motor stator and rotor, resulting in a long flow path within the electronic oil pump, and the oil flow velocity is uneven under different operating conditions. This prevents the temperature sensor from accurately and quickly measuring the oil temperature immediately upon entering the electronic oil pump in real time, failing to meet the requirements for high-precision temperature detection. Summary of the Invention

[0006] To overcome the problems existing in related technologies, this disclosure provides an electronic oil pump.

[0007] According to a first aspect of the present disclosure, an electronic oil pump is provided, comprising: a motor assembly; a gear pump assembly driven by the motor assembly for pumping oil into the electronic oil pump; and an electronic control assembly including a manifold and a temperature sensor, wherein the manifold is located between the motor assembly and the gear pump assembly along the axial direction of the electronic oil pump, and the temperature sensor is disposed on the side of the manifold close to the gear pump assembly for measuring the oil pumped into the electronic oil pump by the gear pump assembly.

[0008] In some embodiments, the electronic oil pump further includes: a pump head, wherein a first cavity is provided on one axial side of the pump head, and the gear pump assembly is located in the first cavity; a pump housing, fixed to the other axial side of the pump head and forming a second cavity with the pump head, wherein the electronic control assembly and the motor assembly are located in the second cavity, wherein the second cavity is not in communication with the first cavity, and the oil only circulates within the first cavity.

[0009] In some embodiments, the temperature sensor includes: a pin electrically connected to the busbar; and a temperature sensor head, wherein the pump head has an axially penetrating fixing hole, and the temperature sensor head extends through the fixing hole into the first cavity and directly contacts the oil in the first cavity.

[0010] In some embodiments, the first cavity includes an oil inlet cavity and an oil outlet cavity, the fixing hole communicates with the oil inlet cavity, and the temperature measuring head of the temperature sensor extends into the oil inlet cavity.

[0011] In some embodiments, the pins of the temperature sensor are wrapped with a first sealing block, the outer wall of the first sealing block being press-fitted and sealed to the inner wall of the fixing hole, so that the temperature sensor is fixed in the fixing hole and the second cavity is sealed.

[0012] In some embodiments, the first sealing block is overmolded with the pins of the temperature sensor.

[0013] In some embodiments, a first sealing ring is provided between the outer wall of the first sealing block and the inner wall of the fixing hole.

[0014] In some embodiments, the electronic oil pump is further provided with a pump shaft that passes through the pump head. A second sealing block is fixedly provided at the connection between the pump head and the pump shaft. The second sealing block is sleeved on the outer wall of the pump shaft, and the radial inner wall of the second sealing block achieves dynamic sealing with the outer wall of the pump shaft.

[0015] In some embodiments, the second sealing block is located within the first cavity, and both the axial end face and the radial outer wall of the second sealing block are fixedly and sealingly abutted against the inner wall of the first cavity.

[0016] In some embodiments, an annular groove is provided on the other axial side of the pump head; an annular insert is provided on one axial side of the pump housing, the annular insert is inserted into the annular groove with interference fit, and a second sealing ring is provided between the outer wall of the annular insert and the inner wall of the annular groove.

[0017] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: The structural design of the electronic oil pump of this disclosure allows the temperature sensor to be closer to the gear pump assembly and directly measure the oil temperature immediately after being pumped into the electronic oil pump. This reduces the path distance and time for the oil to reach the temperature sensor, resulting in a faster response speed for oil temperature monitoring. Simultaneously, the oil pumped into the electronic oil pump by the gear pump no longer passes through the motor assembly, avoiding the oil temperature increase due to the heat generated by the motor assembly, thus making the monitored oil temperature more accurate. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0019] Figure 1 is a cross-sectional view of an electronic oil pump according to an exemplary embodiment;

[0020] Figure 2 is a magnified view of the temperature sensor in Figure 1. Detailed Implementation

[0021] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0022] In this invention, unless otherwise stated, axial, radial, and circumferential refer to the axial, radial, and circumferential directions of the electronic oil pump rotor shaft, respectively; one axial side refers to the lower side in Figure 1, and the other axial side refers to the upper side in Figure 1. The term "torsional connection" refers to a connection between two components that does not rotate relative to each other, which can be achieved by integrally forming the two mentioned components. Those skilled in the art will understand the specific meaning of the above terms in this invention as appropriate.

[0023] To solve the above-mentioned technical problems, this disclosure provides an electronic oil pump 100, as shown in FIG1. ​​The electronic oil pump 100 includes a motor assembly 10, a gear pump assembly 20, an electronic control assembly 30, a pump head 40, a pump housing 50, and a pump shaft 60.

[0024] Specifically, a first cavity 41 is formed on one axial side of the pump head 40 (the lower side as shown in Figure 1), and a pump housing 50 is disposed on the other axial side of the pump head 40. The flange 52 of the pump housing 50 is fixed to the other axial side of the pump head 40 by fasteners, and together with the other axial side of the pump head 40, forms a second cavity 51. Therefore, the first cavity 41 and the second cavity 51 are physically separated by the housing wall of the pump head 40. Along the axial direction A of the electronic oil pump 100, the first cavity 41 opens towards the side away from the pump housing 50, and the first cavity 41 is used to accommodate the gear pump assembly 20, while the second cavity 51 is used to accommodate the electronic control assembly 30 and the motor assembly 10.

[0025] It is understood that the terms "first," "second," etc., are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from one another and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, the second cavity 51 can also be referred to as the first cavity 41, and similarly, the first cavity 41 can also be referred to as the second cavity 51.

[0026] The electronic control assembly 30 (ECU) includes a busbar 31 (also known as a printed circuit board, or PCBA board) and various control elements fixed on the busbar 31. The control elements may include a temperature sensor 32.

[0027] Temperature sensor 32 may include a thermistor. In the electronic oil pump 100, temperature sensor 32 is typically used to monitor the temperature of the oil to prevent overheating or overcooling, ensuring that the oil circulates within a suitable temperature range. It triggers an alarm or automatically shuts down the system when the oil temperature is too high to prevent equipment damage, and adjusts the operating state of the electronic oil pump 100 according to the oil temperature, such as adjusting the pumping speed and flow rate of the oil, to maintain the stability of the entire vehicle's cooling and lubrication systems.

[0028] Along the axial direction of the pump shaft 60 of the electronic oil pump 100, a manifold 31 is disposed between the motor assembly 10 and the gear pump assembly 20, and a temperature sensor 32 is disposed on the side of the manifold 31 closer to the gear pump assembly 20. Therefore, the temperature sensor 32 is closer to the gear pump assembly 20; in other words, the temperature sensor 32 is closer to the first cavity 41. When the gear pump assembly 20 operates within the first cavity 41, the path, distance, and time for the oil to reach the temperature sensor 32 are reduced. The temperature sensor 32 can directly measure the oil temperature of the oil just pumped into the electronic oil pump 100, resulting in a faster and more accurate response to monitor the oil temperature circulating outside the electronic oil pump 100.

[0029] In known technologies, the motor assembly 10 is positioned between the manifold 31 and the gear pump assembly 20. When the gear pump assembly 20 continuously pumps oil, the pumped oil may have already undergone multiple external circulations. Meanwhile, the oil inside the electronic oil pump 100, having to pass through the motor assembly 10, may only just reach the temperature sensor 32, making it impossible for the temperature sensor 32 to accurately measure the real-time oil temperature of the externally circulated oil. Therefore, the electronic oil pump 100 of this disclosure features a centrally located electronic control assembly 30, ensuring that the oil pumped into the electronic oil pump 100 by the gear pump assembly 20 no longer passes through the motor assembly 10. This avoids the oil temperature being affected by the heat generated by the motor assembly 10, and also allows for more real-time and accurate monitoring of the externally circulated oil temperature.

[0030] The pump shaft 60 axially penetrates the pump head 40, with one axial end of the pump shaft 60 located inside the first cavity 41 and the other axial end located inside the second cavity 51. The motor assembly 10, the electronic control assembly 30, and the gear pump assembly 20 are all sleeved on the outside of the pump shaft 60. The electronic control assembly 30 controls the motor assembly 10, and the motor assembly 10 drives the gear pump assembly 20 to operate via the pump shaft 60.

[0031] The motor assembly 10 includes a stator 11 and a rotor 12. The rotor 12 is torsionally connected to the other end of the pump shaft 60. The stator 11 is disposed around the rotor 12 and fixed in the second cavity 51 of the pump housing 50.

[0032] The gear pump assembly 20 located in the first cavity 41 includes an inner rotor 21 and an outer rotor 22. The inner rotor 21 is torsionally connected to one end of the pump shaft 60, and the outer rotor 22 is disposed around the inner rotor 21 and fixed in the first cavity 41 of the pump head 40.

[0033] The inner rotor 21 and the outer rotor 22 have an eccentricity between their axes. The external gear of the inner rotor 21 meshes with the internal gear of the outer rotor 22. The meshing line of the inner rotor 21 and the outer rotor 22 divides the first cavity 41 into an oil inlet cavity 411 and an oil outlet cavity 412. Because the number of teeth on the external gear of the inner rotor 21 and the internal gear of the outer rotor 22 differs by one tooth, the rotational speed of the outer rotor 22 is one tooth slower per revolution than that of the inner rotor 21. Therefore, the volumes of the oil inlet cavity 411 and the oil outlet cavity 412 are constantly changing.

[0034] When the pump shaft 60 rotates, it drives the inner rotor 21 to rotate, which in turn drives the outer rotor 22 to rotate in the same direction at a different speed. At this time, at the oil inlet chamber 411, the gears of the inner rotor 21 and the outer rotor 22 disengage, and the volume of the oil inlet chamber 411 increases from small to large, forming a low-pressure chamber with partial vacuum. This draws the oil outside the electronic oil pump 100 into the first chamber 41. The inner rotor 21 continues to rotate, and the oil is carried to the oil outlet chamber 412. At this time, the inner rotor 21 and the outer rotor 22 are engaged, causing the volume of the oil outlet chamber 412 to gradually decrease and the pressure inside the oil outlet chamber 412 to gradually increase, forming a high-pressure chamber to force the oil out of the first chamber 41. In this way, as the rotor 12 of the motor assembly 10 rotates continuously, the oil is continuously drawn in and forced out, enabling the electronic oil pump 100 to lubricate or cool the motor or the transmission oil tank.

[0035] The electronic control component 30 can be connected to the stator 11 and external systems via a wiring harness. Therefore, when the electronic oil pump 100 is working, the external system transmits control signals to the electronic control component 30 through the wiring harness. The electronic control component 30 controls the motor stator 11 to generate a regularly changing magnetic field through the busbar 31. The motor rotor 12 rotates under the action of the alternating magnetic field, and drives the inner rotor 21 to rotate through the pump shaft 60, thereby circulating and pumping out the oil to achieve the function of cooling and lubricating the automotive motor or transmission gearbox.

[0036] Additionally, as shown in Figure 1, the manifold 31 is fixed inside the second cavity 51 by bolts, clips, and other fixing structures. A through hole is provided in the middle of the manifold 31 to allow the pump shaft 60 to pass through, and there is a radial distance between the middle of the manifold 31 and the outer wall of the pump shaft 60. Therefore, the pump shaft 60 can rotate relative to the manifold 31 of the electronic control component 30 when it rotates.

[0037] In some embodiments, the first cavity 41 and the second cavity 51 may be connected, meaning that when the oil achieves external cooling circulation, it also cools or lubricates the electronic control component 30 and the motor assembly 10 within the second cavity 51 of the electronic oil pump 100. For example, the pump shaft 60 may also be a hollow shaft, allowing the oil in the first cavity 41 to enter the second cavity 51 through the pump shaft 60; alternatively, an oil hole may be provided in the pump head 40 to allow the oil in the first cavity 41 to enter the second cavity 51. In this case, the outer wall of the electronic control component 30 located within the second cavity 51 may be provided with an insulating layer, which serves to provide electromagnetic isolation and waterproofing and oil resistance. This not only prevents the electronic components in the electronic oil pump 100 from affecting the performance of the electronic control component 30, but also prevents the oil from having an electrical impact on the electronic control component 30.

[0038] In some other embodiments, a third cavity may also be isolated within the second cavity 51, and the third cavity is not connected to the second cavity 51, with the electronic control component 30 located within the third cavity. In this case, the oil in the first cavity 41 can enter the second cavity 51 to cool or lubricate the motor assembly 10 within the second cavity 51.

[0039] As can be seen from the above structure, regardless of whether the first cavity 41 and the second cavity 51 are connected, the manifold 31 of the electronic control component 30 is located on the side close to the first cavity 41, and the temperature sensor 32 can measure the oil temperature in the first cavity 41 before the oil enters the first cavity 41.

[0040] In this embodiment, as shown in Figure 1, the second cavity 51 and the first cavity 41 may not be in communication, and the oil only circulates within the first cavity 41. In other words, the second cavity 51 is sealed relative to the first cavity 41. The oil enters through the oil inlet 411 of the first cavity 41, is pumped by the gear pump assembly 20, and then pumped out through the oil outlet 412 of the first cavity 41. This ensures that the circulation path of the oil is limited to within the first cavity 41, preventing the oil from contacting the motor assembly 10 and the electronic control assembly 30, thereby avoiding potential impacts of the oil on the motor assembly 10, and especially on the electronic control assembly 30.

[0041] To ensure complete separation between the second cavity 51 and the first cavity 41, a sealing structure may be provided between the pump head 40 and the pump housing 50. As shown in Figure 1, the pump shaft 60 needs to penetrate the pump housing 50. Therefore, in some embodiments, a second sealing block 43 needs to be provided at the connection between the pump head 40 and the pump shaft 60 to ensure that oil does not leak from the first cavity 41 into the second cavity 51.

[0042] Specifically, the second sealing block 43 can be fixed to the pump head 40, and the second sealing block 43 is sleeved on the outer wall of the pump shaft 60. The radial inner wall of the second sealing block 43 and the outer wall of the pump shaft 60 achieve dynamic sealing, which not only achieves effective sealing between the pump shaft 60 and the first cavity 41, but also ensures that the pump shaft 60 maintains a good dynamic sealing effect with the second sealing block 43 when rotating. In some embodiments, the second sealing block 43 can be fixed in the through hole of the pump head 40 through which the pump shaft 60 passes. In other embodiments, the second sealing block 43 can also be fixed in the second cavity 51, in which case the axial end face of the second sealing block 43 is fixedly connected to the other axial side of the pump head 40.

[0043] In this embodiment, as shown in FIG1, the second sealing block 43 is located inside the first cavity 41 of the pump head 40. The axial end face (the upper end face of the second sealing block 43 in FIG1) and the radial outer wall of the second sealing block 43 are fixedly and sealingly abutted against the inner wall of the first cavity 41.

[0044] The second sealing block 43 may include The skeleton and the sealing rubber are vulcanized and fixed to the outside of the skeleton. The second sealing block 43 passes through... The skeleton provides support for the second sealing block 43, ensuring that the sealing rubber on the axial end face and radial outer wall of the second sealing block 43 can firmly fit against the inner wall of the first cavity 41, thus improving the sealing performance. The sealing rubber on the radial inner wall of the second sealing block 43 is press-fitted against the outer wall of the pump shaft 60. Therefore, even when the pump shaft 60 rotates at high speed, it can maintain a good sealing effect, ensuring that the oil circulates only within the first cavity 41.

[0045] In addition, the second sealing block 43 is annular, and the second sealing block 43 The skeleton and sealing rubber allow the second sealing block 43 to be directly installed in the first cavity 41 without the need for other fasteners, which not only facilitates installation, maintenance and repair, but also effectively reduces maintenance costs.

[0046] Furthermore, in this embodiment, as shown in FIG2, the temperature sensor 32 includes a pin 321 and a temperature measuring head 322. The pin 321 is electrically connected to the busbar 31; the pump head 40 is provided with an axially penetrating fixing hole 42, and the temperature measuring head 322 extends through the fixing hole 42 into the first cavity 41, directly contacting the oil inside the first cavity 41.

[0047] Thus, the temperature sensor 32 is fixed and electrically connected to the busbar 31 via pins 321. The length of pins 321 can be adjusted as needed to ensure that the temperature sensor head 322 can directly contact the oil in the first cavity 41, enhancing the flexibility of the temperature sensor 32. Furthermore, the temperature sensor head 322 extends into the first cavity 41 through the fixing hole 42, simplifying the installation process and making installation more convenient. In addition, the temperature sensor head 322 of this disclosure extends directly into the first cavity 41, further reducing the path distance and time for the oil to reach the temperature sensor 32, resulting in faster response speed for oil temperature monitoring and improved accuracy and reliability of temperature measurement.

[0048] Furthermore, the pins 321 of the temperature sensor 32 are wrapped with a first sealing block 323. The outer wall of the first sealing block 323 is press-fitted and sealed to the inner wall of the fixing hole 42. The first sealing block 323 can not only fix the temperature sensor 32 in the fixing hole 42, but also ensure that the second cavity 51 is not connected to the first cavity 41, thereby preventing oil from leaking from the first cavity 41 into the second cavity 51.

[0049] The first sealing block 323 is integrated with the pin 321 of the temperature sensor 32 through an overmolding process. The first sealing block 323, made of plastic, is tightly wrapped around the pin 321. The ends of the pin 321 and the temperature sensor 322 are axially exposed outside the first sealing block 323, allowing the pin 321 to be electrically connected to the manifold 31 and the temperature sensor 322 to directly contact the oil. This simplifies the assembly process of the first sealing block 323 and the pin 321. As a single unit, they are then assembled with the manifold 31 and the pump head 40, making installation more convenient. Furthermore, it avoids gaps between the outer walls of the first sealing block 323 and the pin 321, thereby improving sealing performance and effectively preventing oil leakage.

[0050] Furthermore, a first sealing ring 324 is provided between the outer wall of the first sealing block 323 and the inner wall of the fixing hole 42. The provision of the first sealing ring 324 further enhances the sealing performance between the first sealing block 323 and the fixing hole 42, effectively preventing oil from leaking from the first cavity 41 to the second cavity 51. The enhanced sealing performance helps to extend the service life of the electronic oil pump 100 and reduces the occurrence of failures caused by oil leakage.

[0051] In some embodiments, the fixing hole 42 is connected to the first cavity 41. Therefore, the fixing hole 42 can be set at the position corresponding to the oil inlet cavity 411 or the oil outlet cavity 412, or it can be set at any position corresponding to the first cavity 41.

[0052] In this embodiment, the fixing hole 42 is connected to the oil inlet chamber 411, which not only improves the monitoring response speed but also enhances the accuracy of temperature measurement. Specifically, the temperature sensor 32's measuring head 322 extends into the oil inlet chamber 411. Therefore, the temperature sensor 32 can immediately monitor the temperature of the oil entering the electronic oil pump 100, improving the monitoring response speed. Since the temperature sensor 32 directly contacts the oil that has just entered the electronic oil pump 100, the influence of the oil being heated by the motor assembly 10 is avoided, thus improving the accuracy of temperature measurement.

[0053] In some embodiments, an annular groove 44 is provided on the other axial side of the pump head 40; an annular insert 53 is provided on one axial side of the pump housing 50, the annular insert 53 is inserted into the annular groove 44 with interference fit, and a second sealing ring 54 is provided between the outer wall of the annular insert 53 and the inner wall of the annular groove 44.

[0054] The annular insert 53 is interference-fitted into the annular groove 44, ensuring a secure connection between the pump head 40 and the pump housing 50 and improving structural stability. The second sealing ring 54 further enhances the sealing performance between the annular insert 53 and the annular groove 44, effectively preventing external oil from entering the second cavity 51 from the gap on the other side of the axial direction between the pump housing 50 and the pump head 40. In summary, by providing a second sealing ring 54 between the outer wall of the annular insert 53 and the inner wall of the annular groove 44, not only is the sealing performance between the pump head 40 and the pump housing 50 enhanced, but the installation process is also simplified, improving the overall performance and reliability of the system.

[0055] Based on the same inventive concept, this disclosure provides a vehicle including the aforementioned electronic oil pump 100, which supplies oil to the engine or transmission gearbox of the wheels for lubrication and cooling. The specific manner in which the functions are implemented in the vehicle described in the above embodiments has been described in detail in the embodiments relating to the electronic oil pump 100, and will not be elaborated upon here.

[0056] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following scope of claims.

[0057] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An electric oil pump (100), characterized in that, include: Motor assembly (10); A gear pump assembly (20), driven by the motor assembly (10), is used to pump oil into the electronic oil pump (100); Electronic control components (30), including a busbar (31) and a temperature sensor (32), Along the axial direction of the electronic oil pump (100), the manifold (31) is located between the motor assembly (10) and the gear pump assembly (20), and the temperature sensor (32) is disposed on the side of the manifold (31) near the gear pump assembly (20) to measure the oil temperature of the oil pumped into the electronic oil pump (100) by the gear pump assembly (20).

2. The electronic oil pump (100) according to claim 1, characterized in that, The electronic oil pump (100) also includes: Pump head (40), a first cavity (41) is provided on one axial side of the pump head (40), and the gear pump assembly (20) is located in the first cavity (41); A pump housing (50) is fixed to the other side of the pump head (40) along its axial direction, and together with the pump head (40) forms a second cavity (51). The electronic control assembly (30) and the motor assembly (10) are located inside the second cavity (51). The second cavity (51) is not connected to the first cavity (41), and the oil only circulates within the first cavity (41).

3. The electronic oil pump (100) according to claim 2, characterized in that, The temperature sensor (32) includes: Pin (321), said pin (321) is electrically connected to the busbar (31); Temperature measuring head (322), the pump head (40) is provided with an axially penetrating fixing hole (42), the temperature measuring head (322) passes through the fixing hole (42) and extends into the first cavity (41), and directly contacts the oil in the first cavity (41).

4. The electronic oil pump (100) according to claim 3, characterized in that, The first cavity (41) includes an oil inlet cavity (411) and an oil outlet cavity (412). The fixing hole (42) is connected to the oil inlet cavity (411), and the temperature measuring head (322) of the temperature sensor (32) extends into the oil inlet cavity (411).

5. The electronic oil pump (100) according to claim 3, characterized in that, The pin (321) of the temperature sensor (32) is wrapped with a first sealing block (323). The outer wall of the first sealing block (323) is press-fitted and sealed to the inner wall of the fixing hole (42) so that the temperature sensor (32) is fixed in the fixing hole (42) and the second cavity (51) is sealed.

6. The electronic oil pump (100) according to claim 5, characterized in that, The first sealing block (323) is formed to cover the pin (321) of the temperature sensor (32).

7. The electronic oil pump (100) according to claim 5, characterized in that, A first sealing ring (324) is provided between the outer wall of the first sealing block (323) and the inner wall of the fixing hole (42).

8. The electronic oil pump (100) according to claim 2, characterized in that, The electronic oil pump (100) is also provided with a pump shaft (60) that passes through the pump head (40). The pump head (40) is fixedly provided with a second sealing block (43) at the connection with the pump shaft (60). The second sealing block (43) is sleeved on the outer wall of the pump shaft (60), and the radial inner wall of the second sealing block (43) achieves dynamic sealing with the outer wall of the pump shaft (60).

9. The electronic oil pump (100) according to claim 8, characterized in that, The second sealing block (43) is located inside the first cavity (41), and the axial end face and radial outer wall of the second sealing block (43) are fixedly and sealingly abutted against the inner wall of the first cavity (41).

10. The electronic oil pump (100) according to claim 2, characterized in that, An annular groove (44) is provided on the other side of the axial direction of the pump head (40); An annular insert (53) is provided on one axial side of the pump casing (50). The annular insert (53) is inserted into the annular groove (44) with an interference fit. A second sealing ring (54) is provided between the outer wall of the annular insert (53) and the inner wall of the annular groove (44).

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