Rear wheel steering position sensor

Abstract

A rear wheel steering position sensor relates to the technical field of automobile sensors and is used for reducing the size of the rear wheel steering position sensor and eliminating influences caused by metal materials. The rear wheel steering position sensor comprises a shell, a shaft body, a rotating shaft, a magnetic plate, a transmission assembly and a Hall sensor. A sliding hole is formed in the shell, and a matching hole communicated with the sliding hole is formed in one side of the shell; the shaft body is slidably arranged in the sliding hole in the extending direction of the sliding hole. The rotating shaft is rotationally arranged on the shell, and the axis of the rotating shaft is arranged in the direction perpendicular to the extending direction of the sliding hole. The magnetic plate is arranged on the rotating shaft; the transmission assembly is arranged between the magnetic plate and the shaft body, and the shaft body drives the magnetic plate to rotate around the axis of the rotating shaft through the transmission assembly; and the Hall sensor is arranged on one side of the rotating shaft, is used for sensing the angle of the magnetic plate, and is connected with a communication line. The position of the shaft body is detected through cooperation of the Hall sensor and the magnetic plate, so that the steering angle of the rear wheel is judged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile sensor, in particular to a rear wheel steering position sensor. BACKGROUND

[0002] With the continuous development of automobile technology, in order to improve the handling performance and driving stability of the automobile, more and more automobiles begin to use rear wheel steering system. The rear wheel steering system can accurately control the steering angle of the rear wheel according to the driving state of the vehicle and the operation of the driver, so as to improve the turning radius, high-speed driving stability and handling flexibility of the vehicle. In this system, the rear wheel steering position sensor plays a crucial role, which is responsible for accurately measuring the steering angle of the rear wheel and feeding back the information to the electronic control unit (ECU) of the vehicle, so that the ECU can accurately control the rear wheel steering system according to the actual situation.

[0003] The existing rear wheel steering position is monitored by an electric eddy current assembly, which usually includes an electric eddy current sensor and a metal block. The metal block is fixedly connected with the shaft body, and moves linearly with the shaft body. The electric eddy current sensor is internally provided with an excitation coil and a receiving coil. By changing the relative position between the excitation coil and the metal block, the magnetic field information sensed by the receiving coil changes, so as to convert the change into the position information of the rear wheel steering, so as to realize the monitoring of the rear wheel steering position and carry out negative feedback adjustment.

[0004] However, on the one hand, the volume of the excitation coil and the receiving coil is large, and the installation space design requirement is high. On the other hand, the receiving coil is sensitive to metal structure, and the elements attached to the electric eddy current assembly need to be excluded from interference, which requires high material. This will affect the design and installation of other elements of the rear wheel steering position part. Practical new type content

[0005] The present application provides a rear wheel steering position sensor for reducing the volume of the rear wheel steering position sensor and excluding the influence of metal materials.

[0006] The present application provides a rear wheel steering position sensor, which comprises a shell, a shaft body, a rotating shaft, a magnetic plate, a transmission assembly and a Hall sensor. A sliding hole is formed in the shell, and a matching hole is provided on one side of the shell and communicates with the sliding hole. The shaft body is slidingly arranged in the sliding hole along the extension direction of the sliding hole. The rotating shaft is rotatably arranged on the shell, and the axis of the rotating shaft is arranged in a direction perpendicular to the extension direction of the sliding hole. The magnetic plate is arranged on the rotating shaft. The transmission assembly is arranged between the magnetic plate and the shaft body, and the shaft body drives the magnetic plate to rotate around the axis of the rotating shaft through the transmission assembly. The Hall sensor is arranged on one side of the rotating shaft, and the Hall sensor is used for sensing the angle of the magnetic plate. The Hall sensor is connected with a communication line.

[0007] The Hall sensor and the magnetic plate in the application can cooperate with each other. When the shaft body slides, the magnetic plate is driven to rotate through the transmission assembly, the Hall sensor senses the change of the magnetic field through the rotation of the magnetic plate, thereby judging the position of the magnetic plate. According to the generated result, the moving distance of the shaft body can be obtained, and the rotation angle of the rear wheel can be determined according to the moving distance, so that the vehicle ECU can obtain the state of the rear wheel and perform negative feedback adjustment on the rear wheel.

[0008] Compared with the traditional sensor containing an excitation coil and a receiving coil, the Hall sensor has a small volume, which can reduce the overall volume of the rear wheel steering position sensor, thereby reducing the difficulty of spatial layout design of the related structure of the rear wheel steering. The sensing mode between the Hall sensor and the magnetic plate is based on the change of the magnetic field of the magnetic plate. The metal material of the shell and other adjacent elements of the rear wheel steering position sensor will not affect the Hall sensor, thereby eliminating the influence of other metal materials on the rear wheel steering position sensor.

[0009] In addition, the detection mode of the traditional electric eddy current sensor containing an excitation coil and a receiving coil has high requirements for the size of the electric eddy current sensor shell and the installation position precision of the internal elements, which leads to high production cost and great production difficulty. The position of the Hall sensor and the magnetic plate in the present application can be assisted by the axis of the shaft, and the accurate position correspondence can also be realized through data debugging during installation. The Hall element and the magnetic plate are simple to produce and have lower cost.

[0010] In some embodiments of the application, the transmission assembly includes a gear and a rack. The gear is sleeved on the shaft, and the magnetic plate is fixedly arranged on the gear. The rack is fixedly arranged on the shaft in the extension direction of the shaft body, and the rack is arranged in the matching hole of the shell. The gear is engaged with the rack. The gear and the rack can convert the sliding of the shaft body into the rotation of the magnetic plate, thereby converting the movement rule of the shaft body into the change of the magnetic plate, and achieving the effect that the sliding of the shaft body drives the rotation of the magnetic plate.

[0011] In some embodiments of the application, the magnetic plate is embedded in the gear. The magnetic plate is fixed in the gear, which can avoid relative sliding or other relative movement between the gear and the magnetic plate, so that the movement of the magnetic plate is completely synchronized with the movement of the gear. Therefore, the change of the magnetic field of the magnetic plate detected by the Hall sensor corresponds to the movement of the shaft body, and the judgment of the rear wheel steering angle is realized.

[0012] In some embodiments of the application, the gear is fixedly connected with the shaft. The gear and the shaft are fixedly connected, which can avoid relative rotation between the gear and the shaft caused by the rotation of the gear, so that the shaft and the gear rotate synchronously.

[0013] In some embodiments of the present application, a groove is arranged on the shaft body, the groove faces the matching hole of the shell, and the rack is fixedly arranged in the groove. The groove can facilitate the fixation of the rack, avoid the rack from being accommodated in the sliding hole when sliding, and avoid the collision between the rack and the shell when the shaft body slides.

[0014] In some embodiments of the present application, the Hall sensor is in a plate shape, and the plate surface of the Hall sensor is arranged in parallel with the plate surface of the magnetic plate. The Hall sensor is parallel to the magnetic plate, which can make the magnetic field of the magnetic plate perpendicular to the current flow direction in the Hall sensor, thereby facilitating the judgment of the magnetic field change rule and the movement distance of the shaft body according to the Hall principle.

[0015] In some embodiments of the present application, two Hall sensors are arranged, the two Hall sensors are arranged at two ends of the rotating shaft respectively, and the two Hall sensors are fixedly connected with the shell. The two Hall sensors can simultaneously detect the movement of the magnetic plate, thereby making the two Hall sensors simultaneously output data to different ports, facilitating the increase of the data transmission port and the direct and rapid transmission of data.

[0016] In some embodiments of the present application, two magnetic plates are arranged, the two magnetic plates are arranged on the gear respectively, and the two magnetic plates are arranged in parallel. The two magnetic plates can be close to one Hall sensor respectively, thereby making each magnetic plate more closely fit the corresponding Hall sensor, and making the Hall sensor more sensitive to the change of the magnetic plate.

[0017] In some embodiments of the present application, the magnetic plate is in a circular shape. In the self-rotation process of the circular magnetic plate, the magnetic field on the surface of the circular magnetic plate will periodically pass through the Hall sensor. According to the Hall effect, when the magnetic field perpendicular to the plane of the Hall element passes through, the Hall potential difference will be generated on both sides of the Hall element. The circular magnetic plate can make the potential difference generated by the Hall element more regular, and the effect of reflecting the movement distance of the shaft body is more direct and obvious.

[0018] In some embodiments of the present application, the shell is further provided with a mounting groove, the opening direction of the mounting groove is the same as the opening direction of the matching hole, the rotating shaft is lapped in the mounting groove, and the bottom wall of the mounting groove is formed with an arc surface matched with the rotating shaft. The rear wheel steering position sensor further comprises a cover plate, the cover plate is arranged on the shell, the cover plate is formed with an abutting portion, the abutting portion is abutted with the rotating shaft, and the end portion of the abutting portion is provided with an arc surface matched with the rotating shaft. The rotating shaft is rotatably arranged between the mounting groove and the abutting portion.

[0019] The rotating shaft is limited between the shell and the cover plate through the arc surface of the abutting portion and the arc surface of the bottom wall of the mounting groove, and the contact arrangement of the two arc surfaces and the rotating shaft can make the rotating shaft freely rotate. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the technical scheme of the utility model, and constitute a part of the specification, and are used to explain the technical scheme of the utility model together with the embodiments of the present application, and do not constitute the limitation to the technical scheme of the utility model.

[0021] Figure 1 The existing eddy current assembly schematic diagram provided for the embodiments of the present application.

[0022] Figure 2 The schematic diagram of a rear wheel steering position sensor provided for the embodiments of the present application.

[0023] Figure 3 One of the partial schematic diagrams of a rear wheel steering position sensor provided for the embodiments of the present application.

[0024] Figure 4 The connection relationship schematic diagram of a gear and a rotating shaft in a rear wheel steering position sensor provided for the embodiments of the present application.

[0025] Figure 5 The second partial schematic diagram of a rear wheel steering position sensor provided for the embodiments of the present application.

[0026] Figure 6 The position relationship schematic diagram of a rotating shaft and a Hall sensor in a rear wheel steering position sensor provided for the embodiments of the present application.

[0027] Figure 7 The cross-sectional schematic diagram of a Hall sensor in a rear wheel steering position sensor provided for the embodiments of the present application.

[0028] Figure 8 The third partial schematic diagram of a rear wheel steering position sensor provided for the embodiments of the present application.

[0029] Figure 9 The first connection relationship explosion schematic diagram of a rotating shaft of a rear wheel steering position sensor provided for the embodiments of the present application.

[0030] Figure 10 The second connection relationship explosion schematic diagram of a rotating shaft of a rear wheel steering position sensor provided for the embodiments of the present application.

[0031] Figure 11 The three-dimensional schematic diagram of a rear wheel steering position sensor provided for the embodiments of the present application.

[0032] The accompanying drawings are used to provide a further understanding of the technical scheme of the utility model, and constitute a part of the specification, and are used to explain the technical scheme of the utility model together with the embodiments of the present application, and do not constitute the limitation to the technical scheme of the utility model. 1 - eddy current assembly; 11 - eddy current sensor; 12 - metal block; 2 - shaft body; 21 - groove; 3 - shell; 31 - sliding hole; 32 - fitting hole; 33 - mounting groove; 4 - rotating shaft; 5 - magnetic plate; 6 - transmission assembly; 61 - gear; 62 - rack; 7 - Hall sensor; 8 - cover plate; 81 - abutting portion. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0034] It should be noted that all directional indications, such as upper, lower, left, right, front, back, and the like, are used to describe the relative positions between components and the movement conditions thereof in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0035] The terms "first", "second", and the like are used only for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "connected" or "connected" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, the "connected" and "connected" used in the present application have the meaning of conducting. The specific meaning should be understood in combination with the context.

[0036] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, the "connected" and "connected" used in the present application have the meaning of conducting. The specific meaning should be understood in combination with the context.

[0037] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words such as "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0038] With the continuous development of automobile technology, in order to improve the handling performance and driving stability of the automobile, more and more automobiles begin to use rear wheel steering system. The rear wheel steering system can accurately control the steering angle of the rear wheel according to the driving state of the vehicle and the operation of the driver, so as to improve the turning radius, high-speed driving stability and handling flexibility of the vehicle. In this system, the rear wheel steering position sensor plays a crucial role, which is responsible for accurately measuring the steering angle of the rear wheel and feeding back the information to the electronic control unit (ECU) of the vehicle, so that the ECU can accurately control the rear wheel steering system according to the actual situation.

[0039] Please refer to Figure 1 , the existing rear wheel steering position is monitored by an electric eddy current assembly 1, which usually includes an electric eddy current sensor 11 and a metal block 12. The metal block 12 is fixedly connected with the shaft body 2, and moves linearly with the shaft body 2. The electric eddy current sensor 11 is provided with an excitation coil and a receiving coil. By changing the relative position between the excitation coil and the metal block 12, the magnetic field information sensed by the receiving coil changes, so as to convert the change into the position information of the rear wheel steering, so as to realize the monitoring of the rear wheel steering position and carry out negative feedback adjustment.

[0040] However, on the one hand, the volume of the excitation coil and the receiving coil is large, and the installation space design requirement is high. On the other hand, the receiving coil is sensitive to metal structure, and the elements attached to the electric eddy current assembly 1 need to be excluded from interference, which requires high material. This will affect the design and installation of other elements of the rear wheel steering position part.

[0041] Therefore, please refer to Figure 2 , the present application provides a new rear wheel steering position sensor, which comprises a shell 3, a shaft body 2, a shaft 4, a magnetic plate 5, a transmission assembly 6 and a Hall sensor 7.

[0042] Please refer to Figure 2 , a sliding hole 31 is formed in the shell 3, and a matching hole 32 is formed in one side of the shell 3 and communicates with the sliding hole 31. The shape of the shell 3 will be modified according to the different installation positions, and the whole shell 3 is a cuboid, which has a plurality of concave, convex and arc surfaces, so that the shell 3 is irregular.

[0043] Please refer to Figure 2 , the sliding hole 31 is a through hole on the shell 3, which can be a circular hole, a square hole or other polygonal hole; the matching hole 32 can be square, rectangular or other polygonal, and the extension direction of the matching hole 32 can be perpendicular to the extension direction of the sliding hole 31, and the two are communicated; the matching hole 32 communicates the sliding hole 31 and the space outside the shell 3.

[0044] Please refer to Figure 2The shaft body 2 is arranged in the sliding hole 31 in the extension direction of the sliding hole 31. The shaft body 2 is usually made of metal material, such as alloy steel or carbon steel, and the cross-sectional shape can be circular or other regular shape. The cross-sectional shape of the shaft body 2 can correspond to the cross-sectional shape of the sliding hole 31 to facilitate the sliding of the shaft body 2 in the sliding hole 31. Both ends of the shaft body 2 extend out of the sliding hole 31, and a driving member can be arranged on the shaft body 2 to drive the shaft body 2 to slide along the sliding hole 31.

[0045] Please refer to Figure 2 The rotating shaft 4 is arranged on the shell 3, and the axis of the rotating shaft 4 is arranged in a direction perpendicular to the extension direction of the sliding hole 31. The rotating shaft 4 is rotationally connected with the shell 3, and a corresponding accommodating space can be arranged on the shell 3 to accommodate the rotating shaft 4, and the rotating shaft 4 can rotate around its axis. The rotating direction of the rotating shaft 4 is the axis direction, and the axis of the rotating shaft 4 is perpendicular to the axis of the shaft body 2. At the same time, the axis of the rotating shaft 4 can be perpendicular to the opening direction of the matching hole 32 on the shell 3, so that the rotating shaft 4 can be horizontally installed at the matching hole 32.

[0046] Please refer to Figure 2 The magnetic plate 5 is arranged on the rotating shaft 4. The magnetic plate 5 can be made of magnet material, which can be a permanent magnet or an electromagnet. The magnetic plate 5 can be a plate body, and the thickness can be uniform. The plate surface shape of the magnetic plate 5 can be circular, or rectangular, regular hexagonal or other polygonal. The connection between the magnetic plate 5 and the rotating shaft 4 can be fixed connection or rotational connection. The connection between the magnetic plate 5 and the rotating shaft 4 depends on the transmission mode between the magnetic plate 5 and the shaft body 2 and the positional relationship between the magnetic plate 5 and the Hall sensor 7. The ultimate purpose is to make the rotation of the magnetic plate 5 correspond to the movement of the shaft body 2 regularly, so that the Hall element can obtain the movement state of the shaft body 2 through the movement of the magnetic plate 5.

[0047] Please refer to Figure 2 The magnetic plate 5 is connected with the rotating shaft 4. In order to avoid the magnetic relationship between the rotating shaft 4 and the magnetic plate 5, which affects the magnetic field of the magnetic plate 5 itself and the induction effect of the Hall sensor 7, the rotating shaft 4 can be made of non-ferromagnetic material.

[0048] Please refer to Figure 2 The transmission assembly 6 is arranged between the magnetic plate 5 and the shaft body 2, and the shaft body 2 drives the magnetic plate 5 to rotate around the axis of the rotating shaft 4 through the transmission assembly 6. The transmission assembly 6 can be a structure that can realize the corresponding transmission effect of sliding and rotating, and the structure should not affect the matching relationship and movement relationship between the shell 3 and the shaft body 2. The transmission assembly 6 can be connected in the form of gear 61 and rack 62, screw nut, chain transmission or crank connecting rod transmission, so as to realize the expected purpose.

[0049] Please refer toFigure 2 The Hall sensor 7 is arranged on one side of the rotating shaft 4, and is used to sense the angle of the magnetic plate 5. The Hall sensor 7 is connected with a communication line. The Hall sensor 7 is a conventional sensor, and the Hall sensor 7 and the magnetic plate 5 are connected based on the Hall principle. The Hall sensor 7 can generate a corresponding model through the magnetic field change of the magnetic plate 5, and determine the moving distance of the shaft body 2 through the signal, and calculate the steering angle of the rear wheel.

[0050] Please refer to Figure 2 The Hall sensor 7 here can only refer to the Hall chip for Hall sensing. Through the Hall chip, the magnetic field change and change state of the magnetic plate 5 can be sensed.

[0051] Please refer to Figure 2 In order to make the Hall sensor 7 complete, the Hall sensor 7 can be configured with a circuit board. The circuit board can be printed with corresponding circuits. The Hall sensor 7 and the circuit board can be fixed on the shell 3 through bolts or other connecting members.

[0052] Please refer to Figure 2 Meanwhile, the circuit board and the Hall sensor 7 can be reinforced through plastic packaging to improve the safety of the circuit board and the Hall sensor 7. The circuit board can be provided with a data line and a corresponding data port. The data line output port of the circuit board can be configured as one or two to ensure stable data transmission under the condition of low voltage of the circuit board and the Hall sensor 7.

[0053] Please refer to Figure 2 The Hall sensor 7 and the magnetic plate 5 in the application can cooperate with each other. When the shaft body 2 slides, the magnetic plate 5 is driven to rotate through the transmission assembly 6. The Hall sensor 7 senses the magnetic field change through the rotation of the magnetic plate 5, so as to determine the position of the magnetic plate 5. According to the generated result, the moving distance of the shaft body 2 can be obtained, so as to determine the rotation angle of the rear wheel according to the moving distance, which is convenient for the vehicle ECU to obtain the state of the rear wheel and to perform negative feedback regulation on the rear wheel.

[0054] Please refer to Figure 2 Compared with the conventional sensor containing an excitation coil and a receiving coil, the Hall sensor 7 has a small size, which can reduce the overall size of the rear wheel steering position sensor, thereby reducing the difficulty of space layout design of the related structure of the rear wheel steering. The sensing mode between the Hall sensor 7 and the magnetic plate 5 is based on the magnetic field change of the magnetic plate 5. The metal material of the shell 3 and other adjacent elements of the rear wheel steering position sensor will not affect the Hall sensor 7, thereby eliminating the influence of other metal materials on the rear wheel steering position sensor.

[0055] Please refer to Figure 1In addition, the traditional eddy current sensor 11 containing an excitation coil and a receiving coil has high requirements for the size of the eddy current sensor 11 shell 3 and the installation position accuracy of the internal elements, resulting in high production cost and great production difficulty. Figure 2 The position of the Hall sensor 7 and the magnetic plate 5 in the scheme can be assisted by the axis of the rotating shaft 4, and the accurate position correspondence can also be realized through data debugging during installation. The Hall element and the magnetic plate 5 are simple to produce and have lower cost.

[0056] Please refer to Figure 1 For example, the traditional eddy current sensor 11 has many internal power-consuming elements, so the eddy current sensor 11 is only configured with one data interface. Due to design problems such as power consumption and space, it is difficult to add a data interface to the eddy current sensor 11, which leads to the fact that if the data interface is to be added, the number of eddy current sensors 11 must be increased or the data must be transmitted indirectly through other elements. Since the eddy current sensor 11 is large in size, it is difficult to achieve the mode of setting multiple eddy current sensors 11. The indirect transmission of data through external elements will increase the data transmission delay, which is not conducive to ECU information processing and control.

[0057] Please refer to Figure 2 Therefore, the Hall sensor 7 in the scheme has low power consumption and small size, and two groups of data output ports (i.e., DIE channels) can be installed on the circuit board of one Hall sensor 7 to realize simultaneous output of two groups of data. The Hall sensor 7 can also form a complete PCBA (printed circuit board assembly) together with the circuit board and the corresponding data transmission line, which can be mass-produced to reduce cost.

[0058] Please refer to Figure 2 Meanwhile, the PCBA is small in size and can be configured with two PCBAs in one rear wheel steering sensor, so as to realize 4-way data transmission at the same time, facilitate simultaneous collection of data information by other elements, and meet the needs of more rear wheel steering position sensors for data connection ports.

[0059] Please refer to Figure 3 In some examples, the transmission assembly 6 includes a gear 61 and a rack 62. The gear 61 is sleeved on the rotating shaft 4, and the magnetic plate 5 is fixedly arranged on the gear 61. The rack 62 is fixedly arranged on the shaft body 2 along the extension direction of the shaft body 2, and is arranged at the matching hole 32 of the shell 3. The gear 61 is engaged with the rack 62. The gear 61 and the rack 62 can convert the sliding of the shaft body 2 into the rotation of the magnetic plate 5, so as to convert the movement law of the shaft body 2 into the change of the magnetic plate 5, thereby realizing the effect that the shaft body 2 slides to drive the magnetic plate 5 to rotate.

[0060] Please refer to Figure 3In some examples, the gear 61 and the rack 62 are engaged with each other, so that when the rack 62 slides along the axis direction of the shaft body 2, the gear 61 can drive the magnetic plate 5 to rotate. In the detection process, the minimum rotation angle of the gear 61 is affected by the rack 62, so the tooth shape of the gear 61 and the rack 62 can be reduced, and more engagement teeth can be arranged within a certain length of the rack 62, so that the rear wheel steering position transmission device provided by the scheme is more sensitive to the movement distance of the shaft body 2, that is, more accurate to the detection of the rear wheel steering angle.

[0061] Please refer to Figure 3 In some examples, in order to fix the connection between the gear 61 and the magnetic plate 5, and avoid the influence of the gear 61 on the magnetic field of the magnetic plate 5, the gear 61 and the rack 62 can be made of plastic material or other non-ferromagnetic metal material, and the gear 61 and the magnetic plate 5 can also be fixedly connected. For example, the gear 61 and the rack 62 can be plastic parts, the rack 62 is formed by injection molding and is fixed on the shaft body 2, and the gear 61 and the magnetic plate 5 are integrally injection molded to make the movement trajectories of the gear 61 and the magnetic plate 5 completely coincide.

[0062] In other examples, the transmission assembly 6 includes a lead screw and a nut, the lead screw is fixedly connected to the shaft body 2 along the axis direction of the shaft body 2, the nut is threadedly connected to the lead screw, the magnetic plate 5 is fixedly connected to the nut, and the nut is rotatably connected to the housing. At this time, the sliding of the shaft body 2 can also drive the lead screw to move, and the nut drives the magnetic plate 5 to rotate, thereby achieving the expected effect.

[0063] In other examples, the transmission assembly 6 can also use chain transmission or crank slider mechanism for transmission, and the sliding of the shaft body 2 can also be converted into the rotation of the magnetic plate 5 through corresponding structures, thereby achieving the corresponding effect.

[0064] Please refer to Figure 3 In some examples, the magnetic plate 5 is embedded in the gear 61. The magnetic plate 5 is fixed in the gear 61, which can avoid relative sliding or other relative movement between the gear 61 and the magnetic plate 5, so that the movement of the magnetic plate 5 is completely synchronized with the movement of the gear 61; so that the change of the magnetic field of the magnetic plate 5 detected by the Hall sensor 7 corresponds to the movement of the shaft body 2, and the judgment of the rear wheel steering angle is realized.

[0065] In some examples, the embedding mode between the magnetic plate 5 and the gear 61 can be a hole, a groove, or fixed by gluing or clamping, or integrally injection molded.

[0066] Please refer to Figure 3 In some examples, the gear 61 is fixedly connected with the rotating shaft 4. The gear 61 is fixedly connected with the rotating shaft 4, which can avoid relative rotation between the gear 61 and the rotating shaft 4 caused by the rotation of the gear 61, and make the rotating shaft 4 rotate synchronously with the gear 61.

[0067] Please refer to Figure 4 In some examples, in order to fix the gear 61 and the rotating shaft 4, and avoid the ferromagnetic effect of the rotating shaft 4 on the magnetic field of the magnetic plate 5, the rotating shaft 4 can be made of plastic, and the rotating shaft 4, the gear 61 and the magnetic plate 5 can be integrally injection molded, so that the three are completely relatively fixed and have higher strength.

[0068] Please refer to Figure 5 In some examples, the shaft body 2 is provided with a groove 21 facing the matching hole 32 of the shell 3, and the rack 62 is fixedly arranged in the groove 21. The groove 21 can facilitate the fixation of the rack 62, so that the rack 62 can be accommodated in the sliding hole 31 when sliding, and the rack 62 and the shell 3 are prevented from colliding when the shaft body 2 slides.

[0069] Please refer to Figure 5 In some examples, the groove 21 on the shaft body 2 can be square or have other shapes, and the length of the groove 21 on the shaft body 2 can be greater than the length of the rack 62, so that the rack 62 can be completely located in the groove 21. The shaft body 2 and the rack 62 can be fixed by bonding or bolt connection.

[0070] Please refer to Figure 5 In some examples, the Hall sensor 7 is in the form of a plate, and the plate surface of the Hall sensor 7 is arranged in parallel with the plate surface of the magnetic plate 5. The parallel arrangement of the Hall sensor 7 and the magnetic plate 5 can make the magnetic field of the magnetic plate 5 perpendicular to the current flow direction in the Hall sensor 7, so as to facilitate the judgment of the magnetic field change rule and the movement distance of the shaft body 2 according to the Hall principle.

[0071] Please refer to Figure 5 In some examples, the plate shape of the Hall sensor 7 can be a physical model, that is, the thickness is the element layout in the Hall sensor 7 and the current direction in the Hall sensor 7, and the Hall sensor 7 is regarded as a plate structure. In addition, the Hall sensor 7 can be installed on the circuit board, so that the plate surface of the PCBA board can be parallel to the plate surface of the magnetic plate 5, and the above-mentioned requirements can also be achieved.

[0072] Please refer to Figure 5 During the rotation of the circular magnetic plate 5, the magnetic field on the surface of the circular magnetic plate 5 will periodically pass through the Hall sensor 7. According to the Hall effect, when the magnetic field perpendicular to the plane of the Hall element passes through, the Hall potential difference will be generated on both sides of the Hall element. The PCBA contains the Hall sensor 7, and the magnetic field changes when the magnetic plate 5 rotates. According to the X, Y and Z axis magnetic field strength components, the magnetic declination angle can be calculated, and the rotation angle of the gear 61, that is, the movement distance of the shaft body 2, can be calculated, so as to calculate the turning angle of the rear wheel.

[0073] Please refer to Figure 5Or, in other examples, the Hall sensor 7 and the magnetic plate 5 can also be not parallel, and an angle can be arranged between the two, when the Hall sensor 7 and the magnetic plate 5 have an angle, the magnetic plate 5 will run in other nonlinear rules with the Hall sensor 7 when rotating, at this time, the parameter correction can be made, so that the output of the Hall sensor 7 can also reflect the moving distance of the shaft body 2, that is, the steering angle of the rear wheel.

[0074] It should be noted that the magnetic plate 5 and the Hall sensor 7 cannot be arranged perpendicularly, and the angle between them can be 0°-15°, which can have a relatively sensitive sensing effect, when the two are parallel, the change is linear, which is convenient for debugging and outputting data through corresponding elements, when the two have an angle, the sensing result of the Hall sensor 7 needs to be corrected, so that the data output by the Hall element changes linearly, and the two need to be simulated and debugged after installation to make the output result stable.

[0075] Please refer to Figure 5 In some examples, the Hall sensor 7 is provided as two, the two Hall sensors 7 are provided as two, and the two Hall sensors 7 are arranged at two ends of the rotating shaft 4, and the two Hall sensors 7 are fixedly connected with the shell 3. The two Hall sensors 7 can detect the movement of the magnetic plate 5 at the same time, so that the two Hall sensors 7 output data to different ports at the same time, which is convenient for increasing the data transmission port and directly and quickly transmitting data.

[0076] Please refer to Figure 5 In some examples, the two Hall sensors 7 can be parallel to each other, and each Hall sensor 7 can be independently arranged, and the distance between the two Hall sensors 7 and the magnetic plate 5 can be equal, so that the detection results of the two Hall sensors 7 are the same, which is convenient for subsequent data processing.

[0077] Please refer to Figure 6 In some examples, the magnetic plate 5 is provided as two, and the two magnetic plates 5 are arranged on the gear 61, and the two magnetic plates 5 are arranged in parallel. The two magnetic plates 5 can be close to a Hall sensor 7 respectively, so that each magnetic plate 5 is more attached to the corresponding Hall sensor 7, and the Hall sensor 7 is more sensitive to the change of the magnetic plate 5.

[0078] Please refer to Figure 6 In some examples, the two magnetic plates 5 can be completely the same, and the two magnetic plates 5 can be embedded in the gear 61. The two magnetic plates 5 can be coaxially arranged, and a spacing can be arranged between the magnetic plates 5.

[0079] Please refer to Figure 6, two magnetic plates 5 can correspond to two Hall sensors 7 respectively, that is, the distance between each Hall sensor 7 and the corresponding magnetic plate 5 is equal, so that the induction effects generated by the two Hall sensors 7 are the same or completely opposite, facilitating the processing of the results and the conversion into the moving distance of the shaft body 2.

[0080] The different magnetic poles of the two magnetic plates 5 can face the other magnetic plate 5, that is, the magnetic fields of the two magnetic plates 5 superimpose each other; or the same magnetic poles of the two magnetic plates 5 can correspond to each other, at this time the magnetic field at the position of the gear 61 will be weakened to a certain extent, that is, the magnetic field strength of the magnetic field at the position of each Hall sensor 7 is reduced, but at this time only the distance between the two magnetic plates 5 needs to be set to several times the thickness of the magnetic plate 5, and the Hall sensor 7 can also generate the Hall effect through the rotation of the magnetic plate 5.

[0081] Please refer to

[0082] In some examples, the magnetic plate 5 can be a circular disc or a ring-shaped disc body.

[0083] In other examples, the magnetic plate 5 can also be square, at this time the rotation of the magnetic plate 5 causes the magnetic field sensed by the Hall sensor 7 to change in a nonlinear regularity, and the position of the shaft body 2 can also be determined according to the period and specific change value of the change, and appropriate parameter correction is also provided, but this method is relatively complex, so the shape of the magnetic plate 5 is preferably circular.

[0084] Please refer to Figure 8 In some examples, the housing 3 is also provided with a mounting groove 33, the opening direction of the mounting groove 33 is the same as the opening direction of the matching hole 32, the rotating shaft 4 is lapped in the mounting groove 33, and the bottom wall of the mounting groove 33 is formed with an arc surface matched with the rotating shaft 4; the rear wheel steering position sensor further comprises a cover plate 8, the cover plate 8 is covered on the housing 3, the cover plate 8 is formed with an abutting portion 81, the abutting portion 81 abuts against the rotating shaft 4, and the end portion of the abutting portion 81 is provided with an arc surface matched with the rotating shaft 4; the rotating shaft 4 is rotationally arranged between the mounting groove 33 and the abutting portion 81.

[0085] Please refer to Figure 9 The rotating shaft 4 passes through the abutting portion 81 of the cover plate 8 and the mounting groove 33 on the housing 3, and is limited between the housing 3 and the cover plate 8 by the arc surface of the abutting portion 81 and the arc surface of the bottom wall of the mounting groove 33, and through the contact of the two arc surfaces with the rotating shaft 4, the rotating shaft 4 can be freely rotated.

[0086] In some examples, the mounting groove 33 can be a square groove, the bottom wall of which is arc-shaped. The mounting groove 33 can be in communication with the matching hole 32 to facilitate the installation of the rotating shaft 4 and the gear 61. The radius of the arc-shaped bottom wall of the mounting groove 33 can be slightly larger than the radius of the rotating shaft 4 or can be equal to the radius of the rotating shaft 4.

[0087] A gap can be provided between the end of the rotating shaft 4 and the side wall of the mounting groove 33 to reduce the friction between the end of the rotating shaft 4 and the wall of the mounting groove 33 during installation.

[0088] Please refer to Figure 10 In some examples, two mounting grooves 33 are provided, and the two mounting grooves 33 are located at the two ends of the rotating shaft 4, respectively. The two ends of the rotating shaft 4 extend into the two mounting grooves 33, respectively. Two abutting portions 81 are provided, and the two abutting portions 81 are located on the two sides of the two mounting grooves 33, respectively. At this time, each end of the rotating shaft 4 can abut against one abutting portion 81 and one mounting groove 33, so that the position of the rotating shaft 4 is stable.

[0089] Please refer to Figure 10 In some examples, the two mounting grooves 33 and the two abutting portions 81 can limit the two ends of the rotating shaft 4, so that the position of the rotating shaft 4 is fixed. Therefore, when the shaft body 2 slides, the rack 62 can drive the gear 61 and the rotating shaft 4 to rotate.

[0090] Please refer to Figure 10 In some examples, the projection of the mounting groove 33 and the abutting portion 81 in the direction perpendicular to the axis of the rotating shaft 4 does not overlap. At this time, the mounting groove 33 and the abutting portion 81 do not interfere with each other, and unnecessary matching design between the abutting portion 81 and the mounting groove 33 is avoided.

[0091] In some examples, the arc surface of the abutting portion 81 and the arc surface of the mounting groove 33 partially overlap in the projection in the axial direction of the rotating shaft 4. Therefore, the end of the rotating shaft 4 can be fully wrapped, and the position of the rotating shaft 4 is stable.

[0092] Alternatively, the arc surface of the abutting portion 81 and the arc surface of the mounting groove 33 can form a complete circle or do not overlap at all in the projection in the axial direction of the rotating shaft 4. At this time, the end of the rotating shaft 4 can also be positioned by multiple angles, so that the position of the rotating shaft 4 is stable.

[0093] Please refer to Figure 11 In some examples, corresponding clamping structures can be provided between the cover plate 8 and the shell 3 to clamp the cover plate 8 and the shell 3. At the same time, the cover plate 8 and the shell 3 can also be fixedly connected by a threaded member. The threaded member can be a screw or a bolt.

[0094] The cover plate 8 can be a metal cover plate 8 or a non-metal cover plate 8, both of which can realize the packaging of the shell 3.

[0095] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in an appropriate manner.

[0096] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A rear wheel steering position sensor, characterized by, The application relates to a rear wheel steering position sensor. The application comprises: a shell, a sliding hole is formed in the shell, a matching hole is arranged on one side of the shell and communicates with the sliding hole; a shaft body, which is slidingly arranged in the sliding hole along the extension direction of the sliding hole; a rotating shaft, which is rotatably arranged on the shell, the axis of the rotating shaft is arranged in a direction perpendicular to the extension direction of the sliding hole; a magnetic plate, which is arranged on the rotating shaft; a transmission assembly, which is arranged between the magnetic plate and the shaft body, the shaft body drives the magnetic plate to rotate around the axis of the rotating shaft through the transmission assembly; a Hall sensor, which is arranged on one side of the rotating shaft, the Hall sensor is used for sensing the angle of the magnetic plate, and a communication line is connected to the Hall sensor.

2. The rear wheel steering position sensor according to claim 1, wherein the transmission assembly comprises a gear and a rack, the gear is sleeved on the rotating shaft, the magnetic plate is fixedly arranged on the gear, the rack is fixedly arranged on the shaft body along the extension direction of the shaft body, the rack is arranged at the matching hole of the shell, and the gear is engaged with the rack.

3. The rear wheel steering position sensor according to claim 2, wherein the magnetic plate is embedded in the gear.

4. The rear wheel steering position sensor according to claim 2, wherein the gear is fixedly connected with the rotating shaft.

5. The rear wheel steering position sensor according to claim 2, wherein a groove is arranged on the shaft body, the groove faces the matching hole of the shell, and the rack is fixedly arranged in the groove.

6. The rear wheel steering position sensor according to any one of claims 2-5, wherein the Hall sensor is in a plate shape, and the plate surface of the Hall sensor is arranged in parallel with the plate surface of the magnetic plate.

7. The rear wheel steering position sensor according to claim 6, wherein the Hall sensor is arranged in two, the two Hall sensors are arranged at two ends of the rotating shaft respectively, and the two Hall sensors are fixedly connected with the shell.

8. The rear wheel steering position sensor according to claim 7, wherein the magnetic plate is arranged in two, the two magnetic plates are arranged on the gear respectively, and the two magnetic plates are arranged in parallel.

9. The rear wheel steering position sensor according to claim 8, wherein the magnetic plate is in a circular shape.

10. The rear wheel steering position sensor according to claim 1, wherein a mounting groove is further arranged on the shell, the opening direction of the mounting groove is the same as the opening direction of the matching hole, the rotating shaft is lapped in the mounting groove, and an arc surface matched with the rotating shaft is formed on the bottom wall of the mounting groove; the rear wheel steering position sensor further comprises a cover plate, the cover plate is arranged on the shell, an abutting portion is formed on the cover plate, the abutting portion abuts against the rotating shaft, and an arc surface matched with the rotating shaft is arranged on the end portion of the abutting portion; the rotating shaft is rotatably arranged between the mounting groove and the abutting portion.

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