Oil pump

Abstract

Disclosed in the present application is an oil pump, comprising a pump casing, and a pump body and an electric motor arranged in the pump casing, wherein a first cavity, a second cavity and a third cavity are formed in the pump body; the pump body is arranged in the first cavity; a partition plate is provided inside the pump casing, the partition plate separating the second cavity from the third cavity; a control assembly is mounted inside the third cavity, the control assembly comprising a temperature sensor, said sensor at least partially extending through the partition plate into the second cavity, and being used for measuring the temperature of oil that enters and comes into contact with the second cavity; and the electric motor is arranged in the second cavity, a terminal of the electric motor extending through the partition plate into the third cavity and being electrically connected to the control assembly. The sensor of the oil pump in the present application can come into direct contact with the oil, thereby accurately measuring the temperature of the oil and, on the basis of said temperature, controlling the operation of the oil pump, ensuring use safety.

Description

oil pump Technical Field

[0001] The present application relates to the technical field of automobile transmissions, and in particular to an oil pump. Background Art

[0002] As an important component of a car, the gearbox can convert the engine speed and torque into speed and torque suitable for the vehicle's driving, and has a vital impact on the car's performance and driving experience.

[0003] The oil pump is a crucial component in the transmission, delivering lubricating oil to various components to maintain lubrication, thereby reducing friction and wear between components and extending the transmission's service life. In practice, excessive oil temperature in transmissions, caused by factors such as low or high oil levels and radiator clogs, is a common automotive fault. Accurately and effectively monitoring oil temperature has become a pressing issue within the industry.

[0004] Summary of the Invention

[0005] In view of this, an oil pump is provided, which can accurately and effectively monitor the oil temperature to ensure safe use.

[0006] An oil pump comprises a pump casing, a pump body and a motor arranged in the pump casing, a first chamber, a second chamber and a third chamber being formed in the pump body, the pump body being arranged in the first chamber, a partition being arranged in the pump casing, the partition separating the second chamber and the third chamber; a control component is installed in the third chamber, the control component comprising a temperature sensor, the sensor at least partially passing through the partition and extending into the second chamber, for detecting the temperature of the oil entering the second chamber and in contact therewith; the motor is arranged in the second chamber, the wiring terminals of the motor pass through the partition and extend into the third chamber, and are electrically connected to the control component.

[0007] Compared with the existing technology, the oil pump provided in this application is provided with a sensor, which extends into the second chamber where the motor is located. During the operation of the oil pump, the sensor can form direct contact with the oil entering the second chamber, accurately detect the temperature of the oil and control the operation of the oil pump accordingly to ensure safe use. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG1 is a schematic structural diagram of an oil pump according to an embodiment of the present application.

[0009] FIG2 is an exploded view of the oil pump shown in FIG1 .

[0010] FIG3 is a radial cross-sectional view of the oil pump shown in FIG1 .

[0011] FIG4 is an axial cross-sectional view of the oil pump shown in FIG1 .

[0012] FIG5 is an enlarged view of circle V in FIG4 .

[0013] FIG. 6 is a view of the pump housing of the oil pump shown in FIG. 1 from another angle.

[0014] FIG. 7 is a view of the pump housing from another angle.

[0015] FIG8 is an exploded view of the motor of the oil pump shown in FIG1 from another angle.

[0016] FIG9 is an exploded view of the motor from another angle.

[0017] FIG10 is a schematic cross-sectional view of a second embodiment of a rotating shaft of a motor.

[0018] FIG11 is a schematic cross-sectional view of a third embodiment of a rotating shaft of a motor.

[0019] FIG12 is a schematic cross-sectional view of a fourth embodiment of a rotating shaft of a motor.

[0020] FIG13 is a schematic longitudinal cross-sectional view of a fifth embodiment of a rotating shaft of a motor.

[0021] Description of Figure Numbers:

[0022] 10. Pump casing; 11. Pump seat; 112. First perforation; 12. First chamber; 14. Second chamber; 16. Third chamber; 17. Step; 18. First end cover; 181. Inlet; 183. Outlet; 185. Shaft seat; 19. Second end cover;

[0023] 20. Pump body; 22. First pump impeller; 24. Second pump impeller; 26. Sealing chamber;

[0024] 30. Motor; 32. Stator assembly; 321. Stator core; 323. Coil; 325. Terminal; 34. Rotor assembly; 341. Rotating shaft; 343. Rotor core; 344. Second through-hole; 345. Permanent magnet; 347. Notch; 349. Diversion groove;

[0025] 40. Control assembly; 42. Sensor; 421. Sensing element; 423. Housing; 425. Fixing bracket; 427. Assembly hole; 429. Pin; 44. Circuit board;

[0026] 50, bracket; 52, ring; 54, partition; 56, positioning column; 58, through hole;

[0027] 60. First sealing member; 62. Second sealing member; 64. Third sealing member.

[0028] DETAILED DESCRIPTION

[0029] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings provide exemplary embodiments of the present application to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that the present application can be implemented in a variety of different forms and is not limited to the embodiments described below.

[0030] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if there are terms such as "up", "down", "left", "right", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, scheme B, or schemes in which A and B are satisfied at the same time.

[0032] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0033] The present application provides an oil pump for driving the flow of oil. Figures 1-5 show a specific embodiment of the oil pump of the present application, in which the oil pump includes a pump housing 10, a pump body 20 disposed in the pump housing 10, a motor 30 that drives the pump body 20 to operate in the pump housing 10, and a control component 40. Please also refer to Figures 6-7. The pump housing 10 is a cylindrical structure as a whole, with multiple chambers formed inside, such as a first chamber 12, a second chamber 14, and a third chamber 16 arranged in sequence along its axial direction. The first chamber 12 is used to install the pump body 20, the second chamber 14 is used to install the motor 30, and the third chamber 16 is used to install electronic devices such as the control component 40. The control component 40 includes a temperature sensor 42. During the operation of the oil pump, the temperature sensor 42 can directly contact the oil, thereby accurately detecting and feeding back the temperature of the oil, and then controlling the operation of the oil pump accordingly to avoid excessive oil temperature affecting safety of use.

[0034] As shown in Figure 3, the pump body 20 includes two impellers 22 and 24 that can rotate relative to each other, with several sealed cavities 26 formed between the two impellers 22 and 24. As the two impellers 22 and 24 rotate relative to each other, the volume of the sealed cavities 26 changes periodically. During a cycle, the volume of the sealed cavities 26 first gradually increases, creating a certain vacuum, drawing oil into the first chamber 12. Thereafter, the volume of the sealed cavities 26 gradually decreases, expelling the absorbed oil. In this continuous cycle, the oil pump continuously draws in and discharges oil, promoting the flow of oil through the system. For example, when the oil pump is used in an automobile transmission, as the volume of the sealed cavities 26 of the pump body 20 gradually increases, the lubricating oil in the transmission's sump is drawn into the oil pump. As the volume of the sealed cavities 26 gradually decreases, the absorbed lubricating oil is pushed out of the oil pump and into other components of the transmission, achieving lubrication between the various components.

[0035] In the illustrated embodiment, both pump impellers 22 and 24 are constructed as gears, preferably with cycloid teeth, and the pump body 20 as a whole is constructed as a cycloid gear pump. For the convenience of description, the two pump impellers 22 and 24 are hereinafter referred to as the first pump impeller 22 and the second pump impeller 24, respectively, wherein the second pump impeller 24 is arranged around the first pump impeller 22 and is eccentrically arranged relative to the first pump impeller 22. Typically, the outer second pump impeller 24 has one more tooth relative to the inner first pump impeller 22. After assembly, all the teeth of the first pump impeller 22 are engaged, and the sealing chamber 26 is formed between the meshing lines of two adjacent teeth. During operation, the first pump impeller 22 rotates relative to the second pump impeller 24, causing the volume of the sealing chamber 26 to change periodically, thereby achieving the pumping in and out of the oil. It should be understood that the pump body 20 can also be constructed as other structures, not limited to the specific embodiments.

[0036] As shown in Figures 8-9, motor 30, serving as the drive for pump body 20, is preferably an inner rotor motor. It includes a stator assembly 32 and a rotor assembly 34 rotatably disposed within stator assembly 32, wherein rotor assembly 34 is connected to pump body 20. Please also refer to Figure 4. Stator assembly 32 includes a stator core 321 and a coil 323 wound around stator core 321. Rotor assembly 34 includes a rotating shaft 341, a rotor core 343 disposed around rotating shaft 341, and a plurality of permanent magnets 345 mounted on rotor core 343. In the illustrated embodiment, rotor core 343 has a plurality of slots 347 formed therein. The slots 347 are evenly spaced along the circumference of rotor core 343, and permanent magnets 345 are embedded in each slot 347. The overall structure is an embedded permanent magnet (IPM) motor, which offers advantages such as near-constant power over a wide speed range and magnet retention.

[0037] One end of the rotating shaft 341 is fixed in the rotor core 343, and the other end extends into the first chamber 12 and is connected to the first pump impeller 22 of the pump body 20. When the motor 30 is started, the coil 323 is energized to generate a periodically changing magnetic field. This magnetic field interacts with the magnetic field of the permanent magnet 345 to drive the rotor assembly 34 to rotate continuously, thereby driving the first pump impeller 22 connected thereto to rotate relative to the second pump impeller 24, thereby achieving the pumping in and out of the oil. The rotating shaft 341 is provided with a guide groove 349, which connects the first chamber 12 and the second chamber 14, guiding a portion of the oil sucked into the first chamber 12 to flow to the second chamber 14. The temperature sensor 42 at least partially extends into the second chamber 14, forming direct contact with the oil flowing into the second chamber 14 to accurately detect the temperature of the oil.

[0038] In the illustrated embodiment, the guide groove 349 is disposed inside the rotating shaft 341, extending along the axial direction of the rotating shaft 341 and penetrating the axial ends of the rotating shaft 341. In some embodiments, the number of the guide grooves 349 can also be multiple. For example, in the embodiment shown in FIG10 , multiple guide grooves 349 are disposed inside the rotating shaft 341, and each guide groove 349 penetrates both ends of the rotating shaft 341; in the embodiment shown in FIG11 , multiple guide grooves 349 are disposed on the circumferential outer wall of the rotating shaft 341 and are spaced apart along the circumference of the rotating shaft 341; in the embodiment shown in FIG12 , multiple guide grooves 349 are disposed on both the inner and outer walls of the rotating shaft 341, each of which can connect the first chamber 12 with the second chamber 14 and guide the oil flow to the temperature sensor 42. In addition, the guide groove 349 is not limited to passing through both ends of the rotating shaft 341. In the embodiment shown in Figure 13, the guide groove 349 can be bent and extended at a position close to the side end of the rotating shaft 341 to pass through the circumferential outer wall of the rotating shaft 341, and can also connect the first chamber 12 with the second chamber 14 to guide the oil to flow to the temperature sensor 42.

[0039] As shown in Figures 4, 6, and 7, the pump housing 10 forms a pump base 11 at the side end thereof corresponding to the pump body 20. The pump base 11 defines the first chamber 12 to accommodate the pump body 20. A rotating shaft 341 passes through the center of the pump base 11 and connects to the first impeller 22 of the pump body 20. The first chamber 12 and the second chamber 14 are separated by the end wall of the pump base 11. This allows the vast majority of oil entering the first chamber 12 to be discharged outward under the action of the pump body 20 without entering the second chamber 14. Only a small amount of oil can enter the bottom of the second chamber 14 through the guide groove 349 of the rotating shaft 341. In this embodiment, a first through-hole 112 is axially extending through the end wall of the pump base 11. This first through-hole 112 connects the second chamber 14 with the first chamber 12 and facilitates the return of oil from the second chamber 14 to the first chamber 12. In the illustration, a single first through-hole 112 is shown. In other embodiments, the number of the first through-holes 112 may be multiple, which is not limited to the specific embodiment.

[0040] In this embodiment, the rotor core 343 is provided with a second through-hole 344 extending axially therethrough. This allows the oil at the bottom of the second chamber 14 to flow more smoothly through the rotor core 343 toward the first through-hole 112 of the pump base 11, and then back to the first chamber 12. As shown by the arrows in Figure 4, the guide groove 349 of the rotating shaft 341, the second through-hole 344 of the stator core 321, and the first through-hole 112 of the pump base 11 collectively form a flow path for the oil between the first chamber 12 and the second chamber 14, ensuring continuous flow of oil into and out of the second chamber 14. The temperature sensor 42 can monitor and provide real-time feedback on the oil temperature. In the figure, multiple second through-holes 344 are spaced apart circumferentially around the rotor core 343. In other embodiments, the number of second through-holes 344 may be single, not limited to the specific embodiment. In some embodiments, when the gap between the stator assembly 32 and the rotor assembly 34 is sufficiently large, the second through-hole 344 may be omitted.

[0041] As shown in Figure 4, the pump housing 10 also includes a first end cover 18 that covers the pump base 11. The first end cover 18 is fixedly connected to the pump housing 10 by screws or the like. The first end cover 18 is provided with an inlet 181 and an outlet 183 for pumping oil in and out. In the illustrated embodiment, the inlet 181 extends through the axial side of the first end cover 18 and communicates with the first chamber 12, while the outlet 183 extends through the circumferential side wall of the first end cover 18 and communicates with the first chamber 12. Preferably, a shaft seat 185 is formed in the center of the first end cover 18 for pivotally connecting the rotating shaft 341, thereby ensuring smooth rotation of the rotor assembly 34. A small gap can be formed between the rotating shaft 341 and the shaft seat 185, allowing oil pumped into the first chamber 12 to pass through the gap and enter the guide groove 349 of the rotating shaft 341, allowing the rotating shaft 341 to rotate freely within the shaft seat 185.

[0042] In this embodiment, a bracket 50 is formed on the stator assembly 32 by overmolding. The bracket 50 includes a ring portion 52 that surrounds and covers the stator assembly 32, which can effectively isolate the coil 323 from the oil entering the second chamber 14, thereby preventing the coil 323 from short-circuiting and affecting electrical safety. The ring portion 52 of the bracket 50 and the stator assembly 32 are an integral structure, which is conducive to the simplification and assembly of the overall structure. Preferably, a step 17 is formed on the inner wall of the pump housing 10, and the step 17 abuts against the outer edge of the ring portion 52 in the axial direction, so as to position the assembly of the bracket 50 and the stator assembly 32 in the axial direction, which is conducive to the rapid assembly of the oil pump of the present application.

[0043] As shown in Figures 4-5, the bracket 50 further includes a partition 54, which separates the second chamber 14 of the pump housing 10 from the third chamber 16. The temperature sensor 42 is fixedly connected to the side of the partition 54 facing the third chamber 16, and specifically includes a sensing element 421, a shell 423 that wraps the sensing element 421, and a fixing frame 425 for supporting the sensing element 421. In this embodiment, the fixing frame 425 is fixed to the partition 54 by hot riveting. Specifically, an assembly hole 427 is provided on the fixing frame 425, and the partition 54 has a positioning column 56 protruding toward the fixing frame 425. During installation, the positioning column 56 passes through the assembly hole 427 of the fixing frame 425, and then the positioning column 56 is heated to deform its end to lock in the corresponding assembly hole 427, thereby fixing the fixing frame 425 to the partition 54. The partition 54 is provided with a through hole 58 at the position corresponding to the temperature sensor 42, so that the sensing element 421 and the shell 423 wrapping the sensing element 421 can partially pass through the through hole 58 and extend into the bottom of the second chamber 14, and directly contact the oil entering the second chamber 14 through the guide groove 349 of the rotating shaft 341, thereby accurately detecting the temperature of the oil.

[0044] Preferably, the housing 423 of the temperature sensor 42 is made of a metal material, which can isolate the sensing element 421 from the oil in the second chamber 14 and avoid affecting the electrical safety of the sensing element 421. At the same time, the metal housing 423 has excellent thermal conductivity, allowing the sensing element 421 to more accurately detect the temperature of the oil. In the illustrated embodiment, a first sealing member 60, such as a sealing ring, is disposed between the housing 423 of the temperature sensor 42 and the wall of the through hole 58 of the partition 54. This allows the housing 423 and the partition 54 to form a sealed connection, preventing oil from penetrating into the third chamber 16 through the gap between the two and affecting electrical safety. Similarly, a second sealing member 62, such as a sealing ring, is disposed between the outer edge of the partition 54 of the bracket 50 and the inner wall of the pump housing 10. This allows the bracket 50 and the pump housing 10 to form a sealed connection, completely separating the third chamber 16 from the second chamber 14.

[0045] As shown in FIG2 , the control assembly 40 further includes a control circuit board 44, on which a controller, etc., is integrated. The coil 323 is electrically connected to the controller via a terminal block 325, which is embedded in the partition 54, with one end extending into the third chamber 16 and plugged into the control circuit board 44. Similarly, the sensing element 421 is electrically connected to the controller via a pin 429, which is fixed and embedded in the fixing frame 425, with one end extending into the third chamber 16 and plugged into the control circuit board 44. In this way, the controller can control the operation of the entire oil pump based on the oil temperature feedback from the sensing element 421, such as controlling the magnitude, direction, and on / off of the current in the coil 323 of the motor 30, thereby ensuring the safe use of the entire oil pump.

[0046] To facilitate component assembly, the side end of the pump housing 10 corresponding to the third chamber 16 is open. A second end cap 19 is provided to cover the open end, protecting electronic components such as the control assembly 40 within the third chamber 16. Preferably, a third sealing line 64, such as a sealing ring, is provided between the second end cap 19 and the pump housing 10, forming a sealed connection between the two. When the oil pump of the present application is used in a gearbox, it can effectively prevent external lubricating oil from entering the third chamber 16 through the gap between the second end cap 19 and the pump housing 10 and affecting electrical safety.

[0047] In the present application, the temperature sensor 42 is fixed in the pump housing 10 by a partition 54. The partition 54 is provided with a through hole 58 so that the temperature sensor 42 can partially extend into the second chamber 14. As shown by the arrow in Figure 4, the oil is sucked into the first chamber 12 through the inlet 181 of the first end cover 18. The small amount of oil sucked into the first chamber 12 extends from the rotating shaft 341 to the side end of the first chamber 12 and enters the guide groove 349. Thereafter, it flows along the guide groove 349 and flows out through the other side end of the rotating shaft 341 to the bottom of the second chamber 14, forming direct contact with the temperature sensor 42 extending into the second chamber 14. In this way, the temperature sensor 42 can detect the temperature of the oil in real time and accurately and feed back to the control component 40, effectively avoiding the occurrence of malfunctions caused by excessive oil temperature.

[0048] A first through-hole 112 is provided in the pump base 11, allowing the oil in the second chamber 14 to flow back to the first chamber 12 through the first through-hole 112 and then out through the outlet 183 under the action of the pump body 20 to lubricate other components. A second through-hole 344 is provided in the rotor assembly 34 of the motor 30, facilitating the flow of oil from the bottom of the second chamber 14 through the motor 30 and toward the pump base 11. Furthermore, the bracket 50 is integrally formed with a ring portion 52 that encases the coil 323 of the motor 30. The terminal 325 is integrally fixed to the partition 50 and extends toward the circuit board 44. This not only isolates the coil 323 from the oil but also forms a single-piece structure for the stator assembly 32, facilitating assembly and electrical connection to the circuit board 44. Similarly, the pin 429 of the sensor 42 is integrally fixed to its mounting bracket 425, which is thermally riveted to the partition 54, facilitating electrical connection between the sensor 42 and the circuit board 44.

[0049] It should be noted that the above embodiments merely represent preferred implementations of the present application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the present application. It should be noted that those skilled in the art may, without departing from the spirit of the present application, make various modifications and improvements, such as combining different features from the various embodiments, and all of these modifications and improvements should fall within the scope of protection of the present application.

Claims

1. An oil pump, comprising a pump housing, a pump body and a motor disposed within the pump housing. A first chamber, a second chamber and a third chamber are formed within the pump body, and the pump body is disposed within the first chamber. It is characterized in that, a partition is provided within the pump housing, and the partition separates the second chamber and the third chamber; a control assembly is installed within the third chamber, and the control assembly includes a temperature sensor. The sensor at least partially passes through the partition and extends into the second chamber for detecting the temperature of the oil fluid entering and contacting the second chamber; the motor is disposed within the second chamber, and a terminal of the motor passes through the partition and extends into the third chamber, being electrically connected to the control assembly.

2. The oil pump according to claim 1, characterized in that, The motor includes a stator assembly and a rotor assembly that rotates relative to the stator assembly. The stator assembly includes a coil. The terminal is embedded and fixed within the partition and is electrically connected to the coil. One end of the terminal extends outside the partition and is electrically connected to the control assembly.

3. The oil pump according to claim 2, wherein a bracket is formed on the stator assembly by overmolding. The bracket includes the partition and a ring portion that surrounds and covers the coil of the stator assembly.

4. The oil pump according to claim 2, wherein, The rotor assembly includes a rotating shaft. One end of the rotating shaft extends into the first chamber and is connected to the pump body; the rotating shaft is provided with a flow guiding groove that communicates the first chamber and the second chamber for guiding the oil fluid to flow from the first chamber to the second chamber.

5. The oil pump according to claim 4, characterized in that, The flow guiding groove extends along the axial direction of the rotating shaft and penetrates both ends of the rotating shaft.

6. The oil pump according to claim 4, characterized in that, The rotor assembly further includes a rotor core that surrounds the rotating shaft. The rotor core is provided with an axially penetrating through hole for guiding the oil fluid to flow from the second chamber to the first chamber.

7. The oil pump according to claim 6, characterized in that, The rotor core is provided with a plurality of notches that are evenly spaced along the circumferential direction of the rotor core, and each notch is provided with a permanent magnet.

8. The oil pump according to claim 3, characterized in that, A step is provided on the inner wall of the pump housing, and the bracket abuts against and is positioned by the step in the axial direction; a seal is provided between the partition of the bracket and the inner wall of the pump housing in the radial direction.

9. The oil pump according to claim 1, characterized in that, The pump housing includes a pump base, and the first chamber is formed within the pump base. The first chamber and the second chamber are separated by an end wall of the pump base. The end wall of the pump base is provided with a through hole that communicates the second chamber and the first chamber for guiding the oil fluid to flow back from the second chamber to the first chamber.

10. The oil pump according to claim 1, characterized in that, The pump body is configured as a gear cycloid pump, including a first pump wheel and a second pump wheel that mesh with each other. The second pump wheel surrounds the first pump wheel and is eccentrically arranged relative to the first pump wheel. The motor is connected to the first pump wheel.

11. The oil pump according to any one of claims 1 to 10, characterized in that, The temperature sensor includes a sensing element, a housing that covers the sensing element, and a fixing bracket for supporting the sensing element. The fixing bracket is connected to the partition, and the housing and the sensing element at least partially pass through the partition and extend into the second chamber.

12. The oil pump according to claim 11, wherein, A through hole is provided in the partition at a position corresponding to the sensor, and a seal is provided between the housing of the sensor and the hole wall of the through hole.

13. The oil pump according to claim 11, wherein, The housing is a metal housing.

14. The oil pump according to claim 11, characterized in that, One of the fixing bracket and the partition board is provided with an assembly hole, and the other is provided with a positioning post. The positioning post passes through and is fixed in the assembly hole to connect the fixing bracket to the partition board.

15. The oil pump according to claim 11, characterized in that, The control assembly further includes a control circuit board. The sensor further includes pins. The pins are embedded and fixed in the fixing bracket and electrically connected to the sensing element. One end of the pins extends out of the fixing bracket and is connected to the control circuit board.

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