A displacement sensor and steering system

Abstract

This utility model discloses a displacement sensor and a steering system, relating to the field of vehicle steering technology. The displacement sensor includes a sensing component and a displacement slider assembly. The sensing component includes a fixed housing and a PCB board, with the PCB board disposed inside the fixed housing and housing a sensor. One end of a fixing member of the displacement slider assembly is fixedly connected to the component to be detected, and a sliding block is fixedly disposed at the other end of the fixing member. A sensing element is disposed at the end of the sliding block facing the sensing component. Along a second direction, the sliding block includes a first and a second limiting surface spaced apart and opposite to each other. The fixing member includes a third and a fourth limiting surface spaced apart and opposite to each other. A buffer component is partially located between the first and third limiting surfaces and partially located between the second and fourth limiting surfaces. This displacement sensor allows the distance between the sensing element and the PCB board to remain within a controllable range, ensuring the accuracy of the displacement sensor.

Description

Technical Field

[0001] This utility model relates to the field of vehicle steering technology, and in particular to a displacement sensor and steering system. Background Technology

[0002] Rear-wheel steering technology significantly improves vehicle comfort and handling, making it a popular feature among both automakers and consumers. Rear-wheel steering requires displacement sensors to continuously monitor the position of the displacement slider assembly, calculating the wheel rotation angle to ensure structural safety in aligning the wheel rotation angle with the control commands issued by the controller.

[0003] It is worth noting that changes in the gap between the sensor plate and the sensor within the steering assembly can affect the sensing accuracy of the steering assembly, thus impacting the accuracy of the entire steering system. Therefore, the gap between the sensor plate and the sensor needs to be within a controllable range. However, when the vehicle travels on bumpy roads, the bumps are transmitted through the tires to the steering knuckle, then to the steering drive shaft, and finally to the sensor plate. This causes the sensor plate to vibrate radially along the steering drive shaft, resulting in an excessively large or small gap between the sensor plate and the sensor, thereby affecting the sensing accuracy. Utility Model Content

[0004] The purpose of this invention is to provide a displacement sensor and steering system that can keep the distance between the sensing element and the PCB board within a controllable range, thereby ensuring the accuracy of the displacement sensor.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A displacement sensor, comprising:

[0007] The sensing component includes a fixed housing and a PCB board, wherein the PCB board is disposed inside the fixed housing and a sensor is disposed on the PCB board;

[0008] A displacement slider assembly is movable along a first direction and disposed outside the fixed housing. The displacement slider assembly includes a fixing member, a sliding block, a sensing plate, and a buffer member. The fixing member is used to connect the object to be detected to the sliding block. The sensing plate is disposed on the sliding block along a second direction. The sliding block includes a first limiting surface and a second limiting surface that are spaced apart and opposite to each other. The fixing member includes a third limiting surface and a fourth limiting surface that are spaced apart and opposite to each other. The third limiting surface and the fourth limiting surface are located between the first limiting surface and the second limiting surface. The buffer member is partially located between the first limiting surface and the third limiting surface, and partially located between the second limiting surface and the fourth limiting surface. The second direction is the direction that is closer to or farther away from the sensor. The first direction and the second direction are arranged at an angle.

[0009] As an optional solution for the above displacement sensor, the inner wall of the sliding block is provided with a limiting groove, the two inner walls of the limiting groove along the second direction are respectively the first limiting surface and the second limiting surface, the side wall of the fixing member is provided with a limiting protrusion, the limiting protrusion is disposed in the limiting groove, the two side walls of the limiting protrusion along the second direction are respectively the third limiting surface and the fourth limiting surface, and the buffer member is sleeved on the limiting protrusion.

[0010] As an alternative to the aforementioned displacement sensor, the buffer member has extensions connected to both ends along the second direction, and the extensions are located between the side wall of the fixing member and the inner wall of the sliding block.

[0011] As an alternative to the aforementioned displacement sensor, the side wall of the fixing member is provided with a fixing groove, and the extension is embedded in the fixing groove.

[0012] As an optional solution for the above displacement sensor, the sliding block is formed by two fastening blocks, and the fastening blocks are provided with fixing grooves. When the two fastening blocks are fastened, the two fixing grooves form a fixing space, and the fixing part is located in the fixing space.

[0013] As an alternative to the aforementioned displacement sensor, the sliding block is provided with a second guide surface on both sides in the first direction, and the second guide surface is provided with an oil storage groove, which is filled with lubricating oil.

[0014] As an optional solution for the above displacement sensor, the sensing plate includes a sensing segment and two fixed segments. The sensing segment is disposed on the end face of the sliding block facing the sensing component, and the two fixed segments are respectively connected to the opposite ends of the sensing segment and extend away from the sensing component to be fixed to the side wall of the sliding block.

[0015] As an optional solution for the above displacement sensor, the front and rear sides of the sliding block in the first direction are called the fixed surface. The fixed surface is provided with a snap-fit ​​groove, and the fixed section is provided with a snap-fit ​​protrusion. The snap-fit ​​protrusion snaps into the snap-fit ​​groove.

[0016] As an alternative to the aforementioned displacement sensor, the buffer is made of polyurethane or vulcanized rubber.

[0017] A steering system includes the displacement sensor, a housing, and a steering drive shaft. The steering drive shaft is axially movable within the housing. The sensing component is fixedly disposed within the housing, and the displacement slider assembly is fixedly connected to the steering drive shaft.

[0018] The beneficial effects of this utility model are:

[0019] This invention provides a displacement sensor and a steering system. In the displacement sensor, the portion of the buffer between the first and third limiting surfaces can reduce the distance the third limiting surface moves towards the first limiting surface, and the portion of the buffer between the second and fourth limiting surfaces can reduce the distance the fourth limiting surface moves towards the second limiting surface.

[0020] In other words, when the vehicle travels on a bumpy road, the bumps are transmitted through the tires to the steering drive shaft and then to the fixed component, causing the fixed component to vibrate back and forth in the second direction. The displacement slider assembly can use the limiting effect of the first and second limiting surfaces to make the third and fourth limiting surfaces press against the buffer component in the corresponding direction, so that part of the vibration is absorbed. This makes the amplitude of the sensing element smaller than the amplitude of the fixed component, ensuring that the distance between the sensing element and the PCB board is within a controllable range, thereby ensuring the accuracy of the displacement sensor. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the steering system of one embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of a displacement slider assembly according to an embodiment of the present invention;

[0023] Figure 3 This is an exploded view of a steering system according to an embodiment of the present invention;

[0024] Figure 4 This is an exploded view of a displacement slider assembly according to an embodiment of the present invention.

[0025] In the picture:

[0026] 100. Housing; 101. Steering drive shaft; 102. Detection window; 103. First guide surface;

[0027] 1. Sensing component; 11. Fixing housing; 111. Top cover; 112. Base; 12. PCB board; 121. Sensor;

[0028] 2. Displacement slider assembly; 21. Sensing plate; 211. Sensing section; 212. Fixing section; 213. Snap-fit ​​protrusion; 22. Fixing component; 221. Third limiting surface; 222. Fourth limiting surface; 223. Limiting protrusion; 224. Fixing part; 225. Screw connection part; 226. Anti-foolproof protrusion; 23. Sliding block; 231. Fastening block; 2311. First limiting surface; 2312. Second limiting surface; 2313. Limiting groove; 2314. Anti-foolproof groove; 232. Second guide surface; 233. Fixing surface; 234. Snap-fit ​​groove; 235. Snap-fit ​​protrusion; 236. Snap-fit ​​recess; 237. Oil reservoir; 24. Buffer component; 241. Extension part. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0031] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] With the development of modern intelligent driving technology and the improvement of road conditions, people have increasingly higher requirements for vehicle comfort and handling, which has led automakers to increase their investment in vehicle chassis research and development. This embodiment provides a vehicle, which includes a vehicle body and a steering system. The steering system includes wheels, tie rods, and a steering device. The steering device includes a drive component and a steering mechanism. Tie rods are rotatably connected to both ends of the steering mechanism, and each tie rod is rotatably connected to a wheel. The drive component can simultaneously control the wheels at both ends of the steering mechanism to rotate in the same direction through the steering mechanism, thereby realizing the steering of the vehicle.

[0035] The rotational connection between the steering mechanism and the tie rod, as well as the rotational connection between the tie rod and the wheel, can be achieved by ball joints or pins, which provide freedom for the relative movement between the steering mechanism, the tie rod, and the wheel, thus preventing jamming.

[0036] It is worth noting that this steering system can be located at the front of the vehicle as a front-wheel steering system or at the rear of the vehicle as a rear-wheel steering system. In this embodiment, the rear-wheel steering system will be used as an example. Through the technology of the rear-wheel steering system, in conjunction with the steering wheel driving the rotation of the front wheels in the front-wheel steering system, when the vehicle is at low speed or understeer, the rear wheels rotate in the opposite direction to the front wheels, thereby reducing the turning radius and improving vehicle agility. When the vehicle has a tendency to oversteer, especially at high speeds, the rear wheels rotate in the same direction as the front wheels, thereby reducing the vehicle's sideslip angle, lowering the steady-state overshoot of the yaw rate, and achieving a smooth lane change effect.

[0037] like Figure 1 As shown, the steering mechanism includes a steering drive shaft 101 and a housing 100. The steering drive shaft 101 is axially movable within the housing 100, which is fixedly connected to the vehicle body to ensure the stability of the steering mechanism. Both ends of the steering drive shaft 101 are connected to corresponding tie rods. The drive component is driven by the steering drive shaft 101 so that the steering drive shaft 101 can reciprocate along its own axis, thereby steering the wheels through the tie rods. To ensure accuracy, the drive component is a motor.

[0038] To better realize the vehicle's steering function, the steering system also includes a controller, which is electrically connected to the drive components. The controller can issue control commands to the drive components, and the drive components drive the wheels to rotate at an appropriate speed and angle according to the control commands.

[0039] In this embodiment, the steering system also includes a displacement sensor, which is fixedly installed in the housing 100 and communicates with the controller. The displacement sensor can detect the wheel rotation angle in real time, ensuring the structural safety of the wheel rotation angle and the control command issued by the controller. It can also control the motor to output appropriate torque according to the rear wheel steering angle, so as to suppress the reverse force from the road surface and avoid the rear wheel steering interference caused by road impact.

[0040] like Figures 1-3 As shown, the displacement sensor includes a sensing component 1 and a sensing element. The sensing component 1 includes a fixed housing 11, a PCB board 12, and a connecting wire harness. The fixed housing 11 is fixedly mounted on the outer casing 100 to ensure the overall stability of the displacement sensor and improve the accuracy of displacement detection. The PCB board 12 is disposed inside the fixed housing 11. The fixed housing 11 is provided with an injection hole. The connecting wire harness passes through the injection hole and is electrically connected to the PCB board 12 at one end. The other end of the connecting wire harness is used to electrically connect to the controller. A sensor 121 is disposed on the PCB board 12 and is used to sense the sensing element.

[0041] To improve the accuracy of wheel steering angle detection, the displacement sensor includes a displacement slider assembly 2, which is equipped with a sensing element 21, which is the object to be sensed. The displacement slider assembly 2 is located outside the fixed housing 11 and connected to the steering drive shaft 101. The steering drive shaft 101 is the object to be sensed, and the sensor 121 is configured to sense the movement of the sensing element 21.

[0042] The fixed housing 11 is used to isolate the sensor 121 and the sensing plate 21, ensuring insulation between them. When the wheel turns, the steering drive shaft 101 moves axially, driving the sensing plate 21 to move. The sensor 121 on the PCB board 12 can sense the movement of the sensing plate 21. The demodulation circuit set on the PCB board 12 can convert the electrical signal into a displacement signal, thereby calculating the angle of wheel rotation.

[0043] like Figure 1 and Figure 3 As shown, to ensure the airtightness of the fixed housing 11, the fixed housing 11 includes a base 112 and a top cover 111. The base 112 is fixedly connected to the outer shell 100 of the steering mechanism. The PCB board 12 is fixedly mounted on the base 112. The top cover 111 is snapped and fixedly connected to the base 112 to form a complete structure to protect the PCB board 12. The fixed housing 11 is designed with a structure in which the base 112 and the top cover 111 snap together, which facilitates the installation of the PCB board 12 into the fixed housing 11.

[0044] It is worth noting that the base 112 and the top cover 111 are fixed by laser welding, welding them into a single unit to achieve a complete seal. In some embodiments, before welding the base 112 and the top cover 111, a clamp is needed to hold and fix them, and then laser welding is performed on the joint. In some embodiments, the base 112 and the top cover 111 are fixed by snap-fit, and then laser welding is performed on the joint, eliminating the need to use a clamp to hold the base 112 and the top cover 111, reducing costs and improving efficiency.

[0045] like Figures 2-4 As shown, to ensure that the sensing element 21 moves synchronously with the steering drive shaft 101, the displacement slider assembly 2 further includes a fixing member 22 and a sliding block 23. One end of the fixing member 22 is connected to the steering drive shaft 101, and the sliding block 23 is fixedly disposed at the other end of the fixing member 22. The sensing element 21 is disposed on the sliding block 23, and the sensor 121 can sense the sensing element 21. Preferably, the sensing element 21 is disposed at the end of the sliding block 23 facing the sensing assembly 1 to reduce irrelevant structural components between the sensing element 21 and the sensor 121, and to facilitate control of the gap between the sensing element 21 and the sensor 121.

[0046] like Figure 3 As shown, for ease of description, in this embodiment, the axial direction of the steering drive shaft 101 is the first direction (X direction in the figure), and the direction closer to or farther from the sensor 121 is the second direction (Y direction in the figure). Generally, the first direction and the second direction are set at an angle. Preferably, the first direction is perpendicular to the second direction, which can ensure that the sensing plate 21 is set parallel to the sensor 121.

[0047] It is understandable that the smaller the distance between the sensor 21 and the PCB board 12, the higher the electrical signal strength during detection, and the more accurate the detection result. For example... Figure 3 As shown, in order to achieve the above purpose, the outer casing 100 is provided with a detection window 102, and the fixed casing 11 is covered by the detection window 102 to ensure the airtightness of the outer casing 100. The sensing sheet 21 is arranged at intervals between the detection window 102 and the fixed casing 11.

[0048] It is understandable that changes in the gap between the sensor plate 21 and the sensor 121 will affect the sensing accuracy of the sensing component 1, thereby affecting the accuracy of the entire steering system. Therefore, the gap between the sensor plate 21 and the sensor 121 needs to be within a controllable range. However, when the vehicle travels on a bumpy road, the bumps are transmitted through the tires to the steering knuckle and then to the steering drive shaft 101, and finally to the sensor plate 21, causing the sensor plate 21 to vibrate radially on the steering drive shaft 101, resulting in the gap between the sensor plate 21 and the sensor 121 being too large or too small.

[0049] like Figures 2-4As shown, to solve the above problems, the displacement slider assembly 2 also includes a buffer 24. Along the second direction, the sliding block 23 includes a first limiting surface 2311 and a second limiting surface 2312 that are spaced apart and opposite to each other. The fixing member 22 includes a third limiting surface 221 and a fourth limiting surface 222 that are spaced apart and opposite to each other. The third limiting surface 221 and the fourth limiting surface 222 are located between the first limiting surface 2311 and the second limiting surface 2312. The buffer 24 is partially located between the first limiting surface 2311 and the third limiting surface 221, and partially located between the second limiting surface 2312 and the fourth limiting surface 222.

[0050] The portion of the buffer 24 between the first limiting surface 2311 and the third limiting surface 221 can reduce the distance the third limiting surface 221 moves towards the first limiting surface 2311, and the portion of the buffer 24 between the second limiting surface 2312 and the fourth limiting surface 222 can reduce the distance the fourth limiting surface 222 moves towards the second limiting surface 2312. In other words, when the vehicle travels on a bumpy road, the bumps are transmitted through the tires to the steering drive shaft 101, and then to the fixing member 22, causing the fixing member 22 to vibrate reciprocally in the second direction. The displacement slider assembly 2, through the limiting effect of the first limiting surface 2311 and the second limiting surface 2312, causes the third limiting surface 221 and the fourth limiting surface 222 to press against the buffer 24 in the corresponding direction, absorbing some of the vibration. This results in the amplitude of the sensing element 21 being smaller than the amplitude of the fixing member 22, ensuring that the distance between the sensing element 21 and the PCB board 12 is within a controllable range, thereby ensuring the accuracy of the displacement sensor.

[0051] Furthermore, the inner wall of the sliding block 23 is provided with a limiting groove 2313. The two inner walls of the limiting groove 2313 along the second direction are respectively the first limiting surface 2311 and the second limiting surface 2312. The fixing member 22 is a fixing bolt. The second direction is the axial direction of the fixing bolt. The fixing bolt includes a threaded part 225 and a fixing part 224 connected to each other. The threaded part 225 is used to be threadedly connected to the steering drive shaft 101. The side wall of the fixing part 224 is provided with a limiting protrusion 223. The fixing part 224 is at least partially located inside the sliding block 23, and the limiting protrusion 223 is provided in the limiting groove 2313. The two side walls of the limiting protrusion 223 along the second direction are respectively the third limiting surface 221 and the fourth limiting surface 222. The buffer member 24 is sleeved on the limiting protrusion 223.

[0052] When the fixing member 22 moves towards the sensing component 1, the first limiting surface 2311 and the third limiting surface 221 press against the buffer member 24, thereby reducing the moving distance of the sliding block 23 to less than the moving distance of the fixing member 22. When the fixing member 22 moves away from the sensing component 1, the second limiting surface 2312 and the fourth limiting surface 222 press against the buffer member 24, further reducing the moving distance of the sliding block 23 to less than the moving distance of the fixing member 22. Moreover, since the limiting protrusion 223 and the limiting groove 2313 jointly press against the buffer member 24 in the second direction, it can effectively prevent the sliding block 23 from loosening or falling off due to durability issues, further improving the accuracy and service life of the displacement sensor.

[0053] Preferably, the limiting groove 2313 is an annular groove and the limiting protrusion 223 is an annular protrusion. This structure can evenly distribute the force between the sliding block 23 and the fixing member 22, which can both prevent the pressure block buffer 24 from being pressed and prevent the sliding block 23 and the fixing member 22 from being offset.

[0054] Furthermore, the buffer 24 is connected to both ends of the buffer 24 along the second direction with an extension 241. The extension 241 is located between the side wall of the fixed part 224 and the inner wall of the sliding block 23. The extension 241 is squeezed by the fixed part 224 and the sliding block 23, which can ensure the relative stability between the sliding block 23 and the fixed part 22 along the second direction, and can also absorb vibration to ensure detection accuracy.

[0055] To ensure relative stability between the buffer 24 and the fixing member 22, a fixing groove is provided on the side wall of the fixing member 22, and the extension 241 is embedded in the fixing groove. Moreover, this structure can also reduce the size of the buffer 24 protruding from the side wall of the fixing member 22, and avoid the extension 241 being excessively squeezed.

[0056] In this embodiment, the buffer 24 is made of polyurethane or vulcanized rubber, which gives the buffer 24 excellent properties such as high strength, high elasticity, high wear resistance, and corrosion resistance. It can not only ensure the stability of the relative position between the sliding block 23 and the fixed part 22, but also play a buffering role. At the same time, it is not easily corroded and worn, thus improving its service life.

[0057] like Figures 2-4 As shown, in order to ensure that the displacement slider assembly 2 remains stable when it moves with the steering drive shaft 101, the housing 100 is provided with a first guide surface 103 on the inner side of the detection window 102, and the side wall of the slider 23 has a second guide surface 232. The second guide surface 232 slides against the first guide surface 103 to ensure that the slider 23 can only move along the first direction.

[0058] Furthermore, the outer casing 100 has two opposing first guide surfaces 103 on the inner side of the detection window 102, the sliding block 23 is located between the two first guide surfaces 103, and the two opposing side walls of the sliding block 23 each have a second guide surface 232, each second guide surface 232 slidingly abutting against the first guide surface 103 on the corresponding side to guide the sliding block 23.

[0059] It is understandable that the spacing direction of the two first guide surfaces 103 of the outer shell 100 is perpendicular to both the first and second directions, that is, it is located on both sides of the detection window 102 in the first direction. The spacing direction of the two second guide surfaces 232 of the sliding block 23 is also perpendicular to both the first and second directions, and is also located on both sides of the sliding block 23 in the first direction.

[0060] To ensure that the sliding block 23 can slide smoothly relative to the outer shell 100, the second guide surface 232 is provided with an oil reservoir 237. The oil reservoir 237 is filled with lubricating oil. The oil reservoir 237 can ensure that the lubricating oil does not leak for a long time, and can also flow between the first guide surface 103 and the second guide surface 232 as the sliding block 23 moves, thereby reducing the friction between the sliding block 23 and the outer shell 100 and improving the smoothness of sliding between the sliding block 23 and the outer shell 100.

[0061] To fix the sensing plate 21 and the sliding block 23, the sensing plate 21 includes a sensing segment 211 and two fixing segments 212. The sensing segment 211 is disposed on the end face of the sliding block 23 facing the sensing component 1. The two fixing segments 212 are respectively connected to the opposite ends of the sensing segment 211 and extend away from the sensing component 1 to be fixed to the side wall of the sliding block 23, thus completing the fixation between the sensing plate 21 and the sliding block 23. The two fixing segments 212 are respectively located on the front and rear sides of the sensing plate 21 in the first direction to avoid affecting the sliding fit between the first guide surface 103 and the second guide surface 232. For ease of description, the front and rear sides of the sliding block 23 in the first direction are referred to as fixing surfaces 233, and the two fixing segments 212 are respectively fixedly disposed on the corresponding fixing surfaces 233.

[0062] Specifically, the fixing surface 233 of the sliding block 23 is provided with a snap-fit ​​groove 234, and the fixing section 212 of the sensing sheet 21 is provided with a snap-fit ​​protrusion 213. The snap-fit ​​protrusion 213 snaps into the snap-fit ​​groove 234 to complete the fixing of the sliding block 23 and the sensing sheet 21. In order to prevent the sensing sheet 21 and the sliding block 23 from moving relative to each other in the first direction, the snap-fit ​​groove 234 has a limiting structure. The limiting structure abuts against the snap-fit ​​protrusion 213 to ensure the relative stability between the sliding block 23 and the sensing sheet 21.

[0063] In this embodiment, the fixed segment 212 includes two interlocking protrusions 213 spaced apart, and the fixed surface 233 is provided with two interlocking grooves 234. The ends of the two interlocking grooves 234 (the ends that are close to each other) are not connected. The two interlocking protrusions 213 are respectively disposed at the ends of the corresponding interlocking grooves 234. At this time, the two interlocking grooves 234 can limit the sensing sheet 21 from opposite directions.

[0064] In some embodiments, the snap-fit ​​groove 234 may also be a groove that does not extend to the surface of the sliding block 23 at either end, and the two snap-fit ​​protrusions 213 are located in the snap-fit ​​groove 234 and are respectively disposed at both ends of the snap-fit ​​groove 234, which can also limit the sensing sheet 21 from two directions.

[0065] In some embodiments, a limiting structure is provided in the snap-fit ​​groove 234, which can abut against the two snap-fit ​​protrusions 213 from opposite directions to limit the sensing sheet 21.

[0066] It is worth noting that the snap-fit ​​protrusion 213 can be a protrusion protruding from the fixed section 212, formed by stamping from the reverse side, or it can be a snap-fit ​​formed by bending inward. In some embodiments, the snap-fit ​​protrusion 213 can also be other structures, as long as it can be snapped into the snap-fit ​​groove 234 to fix the sensing piece 21 and the sliding block 23.

[0067] like Figure 3 and Figure 4 As shown, the sliding block 23 is formed by two fastening blocks 231 fastening together, and the fastening blocks 231 are provided with fixing grooves. When the two fastening blocks 231 are fastened together, the two fixing grooves form a fixing space, and the fixing part 224 of the fixing member 22 is located in the fixing space.

[0068] It is worth noting that, in order to ensure the integrity of the second guide surface 232 of the sliding block 23, the fastening direction of the two fastening blocks 231 is perpendicular to the first direction. In other words, the two first guide surfaces 103 can clamp the two fastening blocks 231 to ensure that the two fastening blocks 231 will not separate.

[0069] To prevent the two fastening blocks 231 from sliding apart relative to each other, the two fastening blocks 231 have a snap-fit ​​structure. The snap-fit ​​structure can ensure the relative stability of the two fastening blocks 231 in the direction perpendicular to the clamping direction of the two first guide surfaces 103 on the sliding block 23.

[0070] Specifically, one fastening block 231 is provided with a snap-fit ​​protrusion 235, and the other fastening block 231 is provided with a snap-fit ​​groove 236. When the two fastening blocks 231 are fastened together, the snap-fit ​​protrusion 235 is engaged into the snap-fit ​​groove 236. In some embodiments, one fastening block 231 may be provided with both a snap-fit ​​protrusion 235 and a snap-fit ​​groove 236, and the other fastening block 231 may be provided with a corresponding snap-fit ​​groove 236 and a snap-fit ​​protrusion 235. When the two fastening blocks 231 are fastened together, their respective snap-fit ​​protrusions 235 are inserted into the corresponding snap-fit ​​grooves 236, further improving stability.

[0071] Understandably, since the sliding block 23 is fastened to the fixing part 224 of the fixing member 22 by two fastening blocks 231, a foolproof structure is required to prevent the fastening blocks 231 from being upside down and causing problems. To achieve the above purpose, the fastening block 231 is provided with a foolproof groove 2314, and the fixing part 224 of the fixing member 22 is provided with a foolproof protrusion 226. The foolproof protrusion 226 is inserted into the foolproof groove 2314, so that the two fastening blocks 231 can be fastened together.

[0072] In this embodiment, the anti-mistake groove 2314 is an annular groove, and the anti-mistake protrusion 226 is an annular protrusion. Moreover, the distance between the anti-mistake protrusion 226 and the limiting protrusion 223 is less than the distance between the limiting groove 2313 and the top surface of the sliding block 23. When the fastening block 231 is upside down, when the limiting protrusion 223 is engaged in the limiting groove 2313, the anti-mistake protrusion 226 will be abutted by the inner wall of the fastening block 231 and interfere, thereby playing the role of preventing mistakes.

[0073] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A displacement sensor, characterized by, include: The sensing component (1) includes a fixed housing (11) and a PCB board (12), wherein the PCB board (12) is disposed inside the fixed housing (11), and a sensor (121) is disposed on the PCB board (12); A displacement slider assembly (2) is movable along a first direction and disposed outside the fixed housing (11). The displacement slider assembly (2) includes a fixing member (22), a sliding block (23), a sensing plate (21), and a buffer member (24). The fixing member (22) is used to connect the object to be detected to the sliding block (23). The sensing plate (21) is disposed on the sliding block (23) along a second direction. The sliding block (23) includes a first limiting surface (2311) and a second limiting surface (2312) that are spaced apart and opposite to each other. The fixing member (22) includes a third limiting surface that is spaced apart and opposite to each other. The third limiting surface (221) and the fourth limiting surface (222) are located between the first limiting surface (2311) and the second limiting surface (2312). The buffer (24) is partially located between the first limiting surface (2311) and the third limiting surface (221), and partially located between the second limiting surface (2312) and the fourth limiting surface (222). The second direction is the direction that is closer to or farther away from the sensor (121). The first direction and the second direction are set at an angle.

2. The displacement sensor of claim 1, wherein, The inner wall of the sliding block (23) is provided with a limiting groove (2313). The two inner walls of the limiting groove (2313) along the second direction are the first limiting surface (2311) and the second limiting surface (2312), respectively. The side wall of the fixing member (22) is provided with a limiting protrusion (223). The limiting protrusion (223) is disposed in the limiting groove (2313). The two side walls of the limiting protrusion (223) along the second direction are the third limiting surface (221) and the fourth limiting surface (222), respectively. The buffer member (24) is sleeved on the limiting protrusion (223).

3. The displacement sensor according to claim 2, characterized in that, The buffer (24) has extensions (241) at both ends along the second direction, and the extensions (241) are located between the side wall of the fixing member (22) and the inner wall of the sliding block (23).

4. The displacement sensor according to claim 3, characterized in that, The side wall of the fastener (22) is provided with a fixing groove, and the extension (241) is embedded in the fixing groove.

5. The displacement sensor according to claim 2, characterized in that, The sliding block (23) is formed by two fastening blocks (231) fastening together, and the fastening block (231) is provided with a fixing groove. When the two fastening blocks (231) are fastened together, the two fixing grooves form a fixing space, and the fixing member (22) is partially located in the fixing space.

6. The displacement sensor according to claim 1, characterized in that, The sliding block (23) is provided with a second guide surface (232) on both sides in the first direction. The second guide surface (232) is provided with an oil storage groove (237) and the oil storage groove (237) is provided with lubricating oil.

7. The displacement sensor according to claim 1, characterized in that, The sensing plate (21) includes a sensing section (211) and two fixed sections (212). The sensing section (211) is disposed on the end face of the sliding block (23) facing the sensing component (1). The two fixed sections (212) are respectively connected to the opposite ends of the sensing section (211) and extend away from the sensing component (1) to be fixed to the side wall of the sliding block (23).

8. The displacement sensor according to claim 7, characterized in that, The front and rear sides of the sliding block (23) in the first direction are called the fixed surface (233). The fixed surface (233) is provided with a snap-fit ​​groove (234). The fixed section (212) is provided with a snap-fit ​​protrusion (213). The snap-fit ​​protrusion (213) snaps into the snap-fit ​​groove (234).

9. The displacement sensor according to claim 1, characterized in that, The buffer (24) is made of polyurethane or vulcanized rubber.

10. A steering system, characterized in that, The displacement sensor according to claim 9 further includes a housing (100) and a steering drive shaft (101), the steering drive shaft (101) being axially movable within the housing (100), the sensing component (1) being fixedly disposed in the housing (100), and the displacement slider component (2) being fixedly connected to the steering drive shaft (101).

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