torque angle sensor

Abstract

The application discloses a torque angle sensor, comprising: a base shell having a mounting space and a mounting channel staggered with the mounting space; a rotor assembly comprising a shaft cylinder, an input rotor and a driving gear, the input rotor and the driving gear being sleeved outside the shaft cylinder, and the shaft cylinder, the input rotor and the driving gear being injection connected; the shaft cylinder is mounted in the mounting channel, the input rotor is rotatably mounted in the mounting space, and the driving gear is located on one side of the base shell; the rotor assembly further comprises a sensing gear, the sensing gear being mounted on one side of the base shell and being engaged with the driving gear; a circuit board is mounted in the mounting space and is correspondingly arranged with the input rotor. The input rotor, the driving gear and the shaft cylinder of the rotor assembly are injection connected, so that the driving gear and the input rotor have high concentricity, and the accuracy of angle measurement results is improved.

Description

Technical Field

[0001] This invention relates to the automotive field, and more particularly to torque angle sensors. Background Technology

[0002] Electric power steering is a system used to assist drivers in making steering adjustments to reduce the force on the steering wheel. The torque angle sensor is a key component of the electric power steering system, and its function is to sense the force on the steering wheel and the steering wheel rotation angle.

[0003] A torque angle sensor typically includes an input shaft rotor, an output shaft rotor, and a circuit board. The input shaft rotor is mounted on the input shaft, and the output shaft rotor is mounted on the output shaft. The circuit board is positioned between the input shaft rotor and the output shaft rotor. An excitation coil is installed within the circuit board, which can generate an alternating magnetic field. When the input shaft rotor and the output shaft rotor rotate relative to the circuit board, an induced electromotive force is generated in the receiving coil of the circuit board. The torque of the torsion bar can be calculated from the angle difference between the input shaft rotor and the output shaft rotor.

[0004] The input shaft is also equipped with a drive gear. When the input shaft rotates, it can drive the drive gear and the input shaft rotor to rotate synchronously. When the drive gear rotates, it can drive the sensing gear to rotate. The absolute angle of the steering wheel can be determined based on the rotation angle of the sensing gear and the rotation angle of the input shaft rotor.

[0005] It should be noted that in existing torque angle sensors, laser welding is commonly used to fix the drive gear and input shaft rotor together. This connection method requires the drive gear to be made of a light-transmitting material and the input shaft rotor to be made of a light-absorbing material, placing high demands on the materials of each component. Furthermore, during installation, the input shaft rotor and drive gear must be aligned and assembled first, which is not only time-consuming and labor-intensive but also makes it difficult to achieve a tight fit between them. Combined with welding errors and post-weld reliability issues, this can lead to significant concentricity errors, thus affecting the accuracy of the angle signal detection. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention aims to provide a torque angle sensor in which the input rotor, the drive gear, and the shaft cylinder of the rotor assembly are injection molded together, enabling the drive gear and the input rotor to have high concentricity and improving the accuracy of angle measurement results.

[0007] To achieve the above objectives, the present invention aims to provide a torque angle sensor, comprising:

[0008] A base shell, the base shell having an installation space and installation channels interspersed with the installation space;

[0009] A rotor assembly includes a shaft sleeve, an input rotor, and a drive gear. The input rotor and the drive gear are sleeved on the outside of the shaft sleeve, and the shaft sleeve, the input rotor, and the drive gear are injection molded together. The shaft sleeve is installed in the mounting channel, the input rotor is rotatably installed in the mounting space, and the drive gear is located on one side of the base shell.

[0010] The rotor assembly also includes an induction gear, which is mounted on one side of the base housing and meshes with the drive gear;

[0011] A circuit board is installed in the mounting space and is configured correspondingly to the input rotor.

[0012] In some embodiments, the torque angle sensor further includes a limiting shell disposed on one side of the base shell, the limiting shell forming a limiting channel, the side of the limiting shell away from the base shell having a limiting opening communicating with the limiting channel, the limiting channel communicating with the mounting channel, the driving gear being rotatably mounted on the limiting channel; the shaft cylinder extends out from the limiting opening after passing through the limiting channel, and the end of the limiting shell with the limiting opening clamps the shaft cylinder.

[0013] In some embodiments, the limiting shell includes an axial limiting plate and a radial limiting plate. One end of the axial limiting plate is connected to the base shell, and the other end extends away from the base shell along the axial direction of the mounting channel. The radial limiting plate extends from the end of the axial limiting plate away from the base shell toward the central axis of the mounting channel, and the radial limiting plate surrounds to form the limiting opening.

[0014] The limiting shell further includes several pressure plates, one end of which is connected to the end of the radial limiting plate away from the axial limiting plate, and the other end extends away from the base shell.

[0015] In some embodiments, the radial limiting plate has movable notches on the portions located on both sides of the pressure plate;

[0016] A clearance notch is provided on one side of the limiting shell corresponding to the position of the sensing gear, and part of the driving gear extends out from the clearance notch and meshes with the sensing gear.

[0017] In some embodiments, the rotor assembly further includes an abutment ring located between the drive gear and the input rotor, the outer side of the abutment ring abutting against the inner wall of the mounting channel, and the abutment ring being injection molded to the drive gear and the input rotor.

[0018] In some embodiments, the base shell includes a front shell and a rear shell, which are joined together to form the mounting space, and the rear shell has a pressure ring extending into the mounting space on the side near the mounting space.

[0019] The circuit board has an clearance opening corresponding to the position of the pressure ring, and the pressure ring passes through the clearance opening to abut against the input rotor.

[0020] In some embodiments, the base shell has a rotating groove on the side near the mounting space, the rotating groove surrounding the mounting channel, and the input rotor is rotatably mounted in the rotating groove.

[0021] In some embodiments, the base housing has a receiving groove on the side where the drive gear is located, and the sensing gear is rotatably mounted in the receiving groove;

[0022] The torque angle sensor also includes a cover plate and an elastic rod. The cover plate is adapted to cover the opening of the receiving groove. The connecting end of the elastic rod is connected to the cover plate, and the pressing end of the elastic rod extends obliquely from the cover plate toward the receiving groove.

[0023] When the cover plate closes to the opening of the receiving groove, the pressing end of the elastic rod presses against the sensing gear.

[0024] In some embodiments, the torque angle sensor further includes a mounting structure disposed on one side of the base housing. The mounting structure includes a base, a fixed arm, and an elastic arm. The bottom of the fixed arm is mounted on one end of the base, and the bottom of the elastic arm is mounted on the other end of the base. A first gap exists between the fixed arm and the elastic arm.

[0025] The elastic arm includes a first elastic arm and a second elastic arm, with a second gap between the first elastic arm and the second elastic arm, and the second elastic arm is located between the first elastic arm and the fixed arm;

[0026] When the mounting structure is inserted into the groove of the fixing base, the first elastic arm and the fixing arm contact the inner wall of the groove, and the first elastic arm bends toward the direction of the second elastic arm; after the mounting structure is inserted into the groove to a preset depth, the first elastic arm contacts the second elastic arm and pushes the second elastic arm to bend toward the direction of the fixing arm.

[0027] In some embodiments, the input rotor includes a wrapping layer and an induction ring. The induction ring has a zigzag extension structure and includes an outer induction segment, an inner connecting segment, and a radial connecting segment. Along the radial direction of the induction ring, the inner connecting segment is closer to the center of the induction ring than the outer induction segment. One end of the radial connecting segment is connected to the outer induction segment, and the other end is connected to the inner connecting segment. The wrapping layer wraps the inner connecting segment and the radial connecting segment, and the inner connecting segment has a positioning hole at a predetermined position. Attached Figure Description

[0028] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0029] Figure 1 This is a three-dimensional structural diagram of a torque angle sensor according to a preferred embodiment of the present invention.

[0030] Figure 2 This is a three-dimensional structural schematic diagram of the torque angle sensor of a preferred embodiment of the present invention from another perspective;

[0031] Figure 3 This is a three-dimensional structural diagram of the front housing of the torque angle sensor according to a preferred embodiment of the present invention.

[0032] Figure 4 This is a three-dimensional structural diagram of the front housing of the torque angle sensor according to a preferred embodiment of the present invention from another perspective.

[0033] Figure 5 This is an exploded structural diagram of the torque angle sensor according to a preferred embodiment of the present invention;

[0034] Figure 6 This is a three-dimensional structural diagram of the cover plate of the torque angle sensor according to a preferred embodiment of the present invention;

[0035] Figure 7 This is a three-dimensional structural diagram of the rear housing of the torque angle sensor according to a preferred embodiment of the present invention;

[0036] Figure 8 This is a top view of the sensing ring of the torque angle sensor according to a preferred embodiment of the present invention.

[0037] Figure 9 This is a three-dimensional structural schematic diagram of the rotor assembly of the torque angle sensor according to a preferred embodiment of the present invention;

[0038] Figure 10 This is a three-dimensional structural schematic diagram of a modified embodiment of the torque angle sensor of the preferred embodiment of the present invention.

[0039] Icon labels:

[0040] 100. Torque angle sensor; 10. Base shell; 11. Installation space; 12. Installation channel; 13. Front shell; 131. Positioning pin; 14. Rear shell; 141. Pressing ring; 142. Limiting post; 15. Rotating groove; 16. Receiving groove; 161. Snap-fit ​​plate; 162. Second snap-fit ​​protrusion; 20. Rotor assembly; 21. Shaft cylinder; 22. Input rotor; 221. Wrapping layer; 222. Sensing ring; 2221. External sensing section; 2222. Internal connecting section; 2220. Positioning hole; 2223. Radial connecting section; 23. Drive gear; 24. Output rotor; 25. Sensing gear; 251. Abutment groove; 26. Abutment ring; 260. Clearance groove; 30. Circuit board; 31. Clearance opening; 32. Fixed... 33. Insertion hole; 40. Limiting groove; 41. Limiting shell; 42. Limiting channel; 43. Limiting opening; 44. Axial limiting plate; 45. Clearance notch; 46. Radial limiting plate; 47. Movable notch; 48. Pressing plate; 59. Cover plate; 50. Opening; 51. Elastic rod; 52. Connecting end; 52. Pressing end; 53. Abutting protrusion; 54. Locking component; 55. First snap-fit ​​protrusion; 60. Mounting structure; 61. Base; 62. First space; 62. Fixed arm; 62. First gap; 62. Second protrusion; 62. Second space; 63. Elastic arm; 63. First elastic arm; 63.1. First protrusion; 63.2. Second elastic arm; 63. Second gap; 64. Connecting component. Detailed Implementation

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0042] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0043] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] refer to Figures 1 to 10 This application provides a torque angle sensor 100, which specifically includes a base shell 10, a rotor assembly 20, and a circuit board 30. The base shell 10 has an installation space 11 and an installation channel 12 interleaved with the installation space 11. Preferably, the installation channel 12 penetrates the base shell 10, the installation space 11 is located inside the base shell 10, and the length extension direction of the installation space 11 is perpendicular to the circumferential direction of the installation channel 12. The rotor assembly 20 includes a shaft cylinder 21, an input rotor 22, and a drive gear 23. The input rotor 22 and the drive gear 23 are sleeved on the outside of the shaft cylinder 21, and the shaft cylinder 21, the input rotor 22, and the drive gear 23 are injection molded together. The shaft cylinder 21 is installed in the installation channel 12, the input rotor 22 is rotatably installed in the installation space 11, and the drive gear 23 is located on one side of the base shell 10. The circuit board 30 is installed in the installation space 11 and is correspondingly arranged with the input rotor 22.

[0047] The circuit board 30 is provided with an excitation coil and a receiving coil. The excitation coil can generate an alternating magnetic field. When the input rotor 22 rotates relative to the circuit board 30, eddy currents can be formed on the input rotor 22, inducing a coupled magnetic field. An induced electromotive force will be generated in the receiving coil, thereby determining the rotation angle of the input rotor relative to the circuit board 30.

[0048] The rotor assembly 20 further includes an output rotor 24. The input rotor 22 is adapted to be mounted on an input shaft, and the output rotor 24 is adapted to be mounted on an output shaft. The input shaft and the output shaft are connected by a torsion bar. When the input rotor 22 and the output rotor 24 rotate relative to the circuit board 30, they can both generate induced electromotive force in their respective receiving coils. Based on the induced electromotive force, the angular difference between the rotation of the input shaft and the output shaft can be calculated, thereby indirectly measuring the torque of the torsion bar.

[0049] refer to Figure 5 Furthermore, the rotor assembly 20 also includes an induction gear 25, which is mounted on one side of the base housing 10 and meshes with the drive gear 23. When the drive gear 23 rotates, it can drive the induction gear 25 to rotate synchronously. The torque angle sensor 100 also includes an angle measuring assembly (not shown in the figure), which includes a magnetic element and a Hall sensor. The magnetic element is preferably a magnet and is disposed on the induction gear 25. The Hall sensor is disposed on the base housing 10 and is correspondingly disposed with respect to the induction gear 25. When the induction gear 25 drives the magnetic element to rotate, it can drive the magnetic element to move relative to the Hall sensor. The Hall sensor can detect the change in magnetic flux density generated when the magnetic element moves, thereby measuring the rotation angle of the induction gear 25.

[0050] It should be noted that there is a preset transmission ratio between the drive gear 23 and the sensing gear 25. The least common multiple of the rotation angle of the input rotor 22 and the rotation angle of the sensing gear 25 is the absolute angle of the steering wheel rotation.

[0051] In this application, the input rotor 22, the drive gear 23, and the shaft sleeve 21 of the rotor assembly 20 are injection molded together, which enables the drive gear 23 and the input rotor 22 to have a high degree of concentricity, improving the accuracy of angle measurement results. On the other hand, since the input rotor 22, the drive gear 23, and the shaft sleeve 21 are injection molded together, the material requirements for forming the drive gear 23 and the rotor assembly 20 can be reduced, thereby reducing manufacturing costs.

[0052] Furthermore, the input rotor 22 includes a wrapping layer 221 and an induction ring 222, wherein the wrapping layer 221 partially wraps the induction ring 222, and a portion of the induction ring 222 extends out of the wrapping layer 221. Preferably, the induction ring 222 is made of metal.

[0053] Preferably, the material of the shaft sleeve 21 includes metal. In some embodiments, the drive gear 23 is integrally injection molded to the input rotor 22. During the injection molding process, the shaft sleeve 21 is first positioned corresponding to the sensing ring 222, and then the drive gear 23 and the wrapping layer 221 are integrally injection molded at a predetermined position on the shaft sleeve 21 and the sensing ring 222. In some embodiments, the wrapping layer 221 is first injection molded to the outside of the sensing ring 222, and then the shaft sleeve 21 is placed corresponding to the input rotor 22, with the input rotor 22 as an insert. The drive gear 23 is then injection molded at a predetermined position on the shaft sleeve 21, and the drive gear 23 is injection molded to the shaft sleeve 21 and the input rotor 22. In some modified embodiments, the drive gear 23 is first injection molded at a predetermined position on the shaft 21. Then, the shaft 21 is placed correspondingly to the sensing ring 222, and the drive gear 23 is used as an insert. The wrapping layer 221 is injection molded on one side of the drive gear 23, so that the wrapping layer 221 wraps part of the sensing ring 222 and the wrapping layer 221 is injection molded to the drive gear 23.

[0054] refer to Figure 3 Furthermore, the torque angle sensor 100 also includes a limiting shell 40, which is disposed on one side of the base shell 10. The limiting shell 40 forms a limiting channel 41 around the base shell 10. The side of the limiting shell 40 away from the base shell 10 has a limiting opening 410 that communicates with the limiting channel 41. The limiting channel 41 communicates with the mounting channel 12. The drive gear 23 is rotatably mounted on the limiting channel 41. The shaft cylinder 21 extends out of the limiting opening 410 after passing through the limiting channel 41. The end of the limiting shell 40 with the limiting opening 410 clamps the shaft cylinder 21.

[0055] Furthermore, the limiting shell 40 includes an axial limiting plate 42 and a radial limiting plate 43. One end of the axial limiting plate 42 is connected to the base shell 10, and the other end extends away from the base shell 10 along the axial direction of the mounting channel 12. The radial limiting plate 43 extends from the end of the axial limiting plate 42 away from the base shell 10 toward the central axis of the mounting channel 12, and the radial limiting plate 43 surrounds to form the limiting opening 410.

[0056] Along the axial direction of the mounting channel 12, the radial limiting plate 43 can limit the drive gear 23 from the outside, and the base shell 10 can limit the input rotor 22 installed in the mounting space 11, thereby effectively limiting the rotor assembly 20 in the axial direction of the mounting channel 12. On the other hand, the end of the limiting shell 40 with the limiting opening 410 can clamp the shaft cylinder 21, assisting in limiting the rotor assembly 20 in the axial direction of the mounting channel 12.

[0057] refer to Figure 3 Furthermore, the limiting shell 40 further includes a plurality of pressure plates 44, one end of which is connected to the end of the radial limiting plate 43 away from the axial limiting plate 42, and the other end extends away from the base shell 10. After the shaft cylinder 21 passes through the limiting opening 410, the pressure plate 44 can press against the shaft cylinder 21 to limit the rotor assembly 20 in the axial direction of the mounting channel 12. Preferably, the other end of the pressure plate 44 extends obliquely away from the base shell 10, and the pressure plate 44 is opened when the shaft cylinder 21 is inserted into the limiting opening 410, thereby allowing the pressure plate 44 to have a greater clamping force when clamping the shaft cylinder 21.

[0058] The radial limiting plate 43 has movable notches 430 on the portions located on both sides of the pressure plate 44; the limiting shell 40 has an clearance notch 420 on one side corresponding to the position of the sensing gear 25, and a portion of the driving gear 23 extends out from the clearance notch 420 and meshes with the sensing gear 25. By providing the movable notches 430 on the portions of the radial limiting plate 43 corresponding to the portions on both sides of the pressure plate 44, the radial limiting plate 43 connected to the pressure plate 44 can also deform during the process of the shaft cylinder 21 being inserted into the limiting opening 410, thereby increasing the clamping force of the pressure plate 44 on the shaft cylinder 21 and improving the stability of fixing the shaft cylinder 21.

[0059] refer to Figure 9Furthermore, the rotor assembly 20 also includes an abutment ring 26, which is located between the drive gear 23 and the input rotor 22. The outer side of the abutment ring 26 abuts against the inner wall of the mounting channel 12, and the abutment ring 26 is injection molded to the drive gear 23 and the input rotor 22. Preferably, the abutment ring 26, the drive gear 23, and the input rotor 22 are integrally injection molded. The size of the abutment ring 26 is adapted to the size of the mounting channel 12. After the rotor assembly 20 is installed in the mounting channel 12 of the base shell 10, the outer wall of the abutment ring 26 abuts against the inner wall of the mounting channel 12. When the abutment ring 26 rotates within the mounting channel 12, the outer wall of the mounting channel 12 can limit the rotation trajectory of the abutment ring 26, improving the stability of the abutment ring 26 during rotation. Preferably, along the radial direction of the sensing ring 222, the outer peripheral surface of the abutment ring 26 is flush with the outer peripheral surface of the drive gear 23.

[0060] refer to Figure 3 , Figure 4 , Figure 5 as well as Figure 7 Furthermore, the base shell 10 includes a front shell 13 and a rear shell 14, which are joined together to form the mounting space 11. The rear shell 14 has a pressure ring 141 extending into the mounting space 11 on its side near the mounting space 11. The circuit board 30 has a clearance opening 31 corresponding to the position of the pressure ring 141, through which the pressure ring 141 abuts against the input rotor 22. The input rotor 22 is located between the front shell 13 and the circuit board 30, and the circuit board 30 is located between the input rotor 22 and the rear shell 14. When the front shell 13 and the rear shell 14 are assembled together, the pressure ring 141 on the rear shell 14 can abut against the input rotor 22, improving the stability of the input rotor 22 when rotating within the mounting space 11.

[0061] refer to Figure 4 Furthermore, the base shell 10 has a rotating groove 15 on the side near the mounting space 11. The rotating groove 15 surrounds the mounting channel 12 and communicates with the mounting channel 12. The input rotor 22 is rotatably mounted in the rotating groove 15. The inner wall of the rotating groove 15 can limit the rotation trajectory of the input rotor 22, improving the stability of the input rotor 22 when rotating within the rotating groove 15.

[0062] The output rotor 24 is located on the side of the rear housing 14 away from the front housing 13, and the output rotor 24 is rotatable relative to the rear housing 14.

[0063] refer to Figure 4 The front housing 13 has a plurality of positioning pins 131 at a preset position on the side near the mounting space 11, and the circuit board 30 has a plurality of positioning holes 32 at a preset position. When the circuit board 30 is installed in the mounting space 11, the plurality of positioning pins 131 are inserted into the plurality of positioning holes 32 respectively, so that the circuit board 30 and the front housing 13 are aligned during the assembly process.

[0064] Furthermore, the rear housing 14 has a limiting post 142 extending into the mounting space 11 on the side near the mounting space 11, and the edge of the circuit board 30 has a plurality of limiting grooves 33. When the circuit board 30 is installed between the front housing 13 and the rear housing 14, the plurality of limiting posts 142 are adapted to be installed in the plurality of limiting grooves 33 to abut against the circuit board 30 around its perimeter, further improving the stability of the circuit board 30 after it is assembled into the mounting space 11.

[0065] refer to Figure 8 Furthermore, the sensing ring 222 has a tortuous extension structure, and the sensing ring 222 has an outer sensing segment 2221, an inner connecting segment 2222, and a radial connecting segment 2223. Along the radial direction of the sensing ring 222, the inner connecting segment 2222 is closer to the center of the sensing ring 222 than the outer sensing segment 2221. One end of the radial connecting segment 2223 is connected to the outer sensing segment 2221, and the other end is connected to the inner connecting segment 2222. The wrapping layer 221 wraps the inner connecting segment 2222 and the radial connecting segment 2223, and the outer sensing segment 2221 is located outside the wrapping layer 221.

[0066] The internal connecting section 2222 has a positioning hole 2220 at a preset position. When the wrapping layer 221 is injection molded on the outside of the sensing ring 222, the positioning hole 2220 on the internal connecting section 2222 facilitates the positioning and fixing of the sensing ring 222, thereby improving the positional accuracy of the wrapping layer 221 when it wraps around the sensing ring 222.

[0067] Preferably, at least two of the inner connecting segments 2222 have the positioning holes 2220 along the circumferential direction of the sensing ring 222. Along the radial direction of the sensing ring 222, the width of the inner connecting segment 2222 with the positioning hole 2220 is greater than the width of the inner connecting segment 2222 without the positioning hole 2220. The wider size of the inner connecting segment 2222 with the positioning hole 2220 facilitates the formation of positioning holes 2220 with a larger diameter.

[0068] In some variations, there are two or more positioning holes 2220 on the same internal connecting segment 2222.

[0069] Furthermore, along the axial direction of the sensing ring 222, the positioning hole 2220 corresponds to the tooth groove of the drive gear 23, thereby reducing the interference between the positioning component inserted into the positioning hole 2220 and the drive gear 23 to a certain extent.

[0070] The abutment ring 26 has a clearance groove 260 extending along the thickness direction of the abutment ring 26 at the position corresponding to the positioning hole 2220 and the tooth groove of the drive gear 23. Similarly, during the injection molding process, the clearance groove 260 can avoid the positioning component inserted into the positioning hole 2220, thus preventing the abutment ring 26 from interfering with the positioning component.

[0071] refer to Figure 3 Furthermore, the base shell 10 has a receiving groove 16 on one side of the drive gear 23, and the sensing gear 25 is rotatably mounted in the receiving groove 16. The torque angle sensor 100 also includes a cover plate 51 and an elastic rod 52. The cover plate 51 is adapted to cover the opening of the receiving groove 16. The connecting end 521 of the elastic rod 52 is connected to the cover plate 51, and the pressing end 522 of the elastic rod 52 extends obliquely from the cover plate 51 toward the receiving groove 16. When the cover plate 51 covers the opening of the receiving groove 16, the pressing end 522 of the elastic rod 52 presses against the sensing gear 25. The cover plate 51 is detachably installed in the opening of the receiving groove 16. When the cover plate 51 is installed in the opening of the receiving groove 16, the elastic rod 52 presses against the sensing gear 25, which can limit the sensing gear 25 in the axial direction and improve the stability of the sensing gear 25 when it rotates in the receiving groove 16.

[0072] The sensing gear 25 has an abutment groove 251 on its surface near the cover plate 51, and the end of the elastic rod 52 away from the cover plate 51 extends into the abutment groove 251. The elastic rod 52 can be accommodated within the abutment groove 251, thereby reducing the distance between the cover plate 51 and the sensing gear 25, which helps to reduce the overall thickness of the torque angle sensor 100. Furthermore, the sidewall of the abutment groove 251 can also limit the movement distance of the pressing end 522 of the elastic rod 52 along the radial direction of the sensing gear 25.

[0073] Preferably, there are two elastic rods 52, and the two elastic rods 52 are symmetrically arranged with respect to the central axis of the sensing gear 25. In some embodiments, there may be more than two elastic rods 52, and the specific number of elastic rods 52 should not constitute a limitation of this application.

[0074] The cover plate 51 also includes an abutment protrusion 53 on the side where the elastic rod 52 is located. The abutment protrusion 53 is located on the side of the elastic rod 52. When the cover plate 51 is closed at the opening of the receiving groove 16, the abutment protrusion 53 abuts against the side of the sensing gear 25 near the cover plate 51.

[0075] The torque angle sensor 100 also includes a locking member 54, one end of which is connected to the cover plate 51, and the other end of which extends toward the receiving groove 16 and is adapted to be snapped into the side wall of the receiving groove 16.

[0076] The locking member 54 has a first engaging protrusion 541, and one side of the receiving groove 16 has an engaging plate 161. The engaging plate 161 has a second engaging protrusion 162 at a position away from the cover plate 51. The first engaging protrusion 541 is adapted to engage with the second engaging protrusion 162 to limit the cover plate 51 in the axial direction of the sensing gear 25.

[0077] The cover plate 51 has an opening 510 corresponding to the position of the snap-fit ​​plate 161, and one end of the snap-fit ​​plate 161 near the cover plate 51 is adapted to pass through the opening 510.

[0078] Furthermore, the torque angle sensor 100 also includes a mounting structure 60, which is disposed on one side of the base shell 10 and is adapted to fix the torque angle sensor 100 to the mounting base.

[0079] Specifically, the mounting structure 60 includes a base 61, a fixed arm 62, and an elastic arm 63. The bottom of the fixed arm 62 is mounted on one end of the base 61, and the bottom of the elastic arm 63 is mounted on the other end of the base 61. A first gap 620 exists between the fixed arm 62 and the elastic arm 63. The elastic arm 63 includes a first elastic arm 631 and a second elastic arm 632. A second gap 630 exists between the first elastic arm 631 and the second elastic arm 632, and the second elastic arm 632 is located between the first elastic arm 631 and the fixed arm 62. When the mounting structure 60 is inserted into the groove of the fixed base, the first elastic arm 631 and the fixed arm 62 contact the inner wall of the groove, and the first elastic arm 631 bends towards the second elastic arm 632. After the mounting structure 60 is inserted into the groove to a predetermined depth, the first elastic arm 631 contacts the second elastic arm 632 and pushes the second elastic arm 632 to bend towards the fixed arm 62.

[0080] In this application, during the installation of the mounting structure 60 into the groove of the fixing base, the first elastic arm 631 and the fixing arm 62 initially contact the inner wall of the groove. As the installation depth of the mounting structure 60 within the groove increases, the first elastic arm 631 bends towards the second elastic arm 632. As the installation depth of the mounting structure 60 within the groove of the fixing arm 62 further increases, the first elastic arm 631 contacts the second elastic arm 632 and pushes the second elastic arm 632 towards the fixing arm 62. When the mounting structure 60 is initially installed into the groove of the fixing base, one elastic arm deforms, resulting in relatively low resistance. As the installation depth increases, both elastic arms deform, exerting a greater reaction force on the fixing base, thus making the mounting structure 60 more securely installed in the groove of the fixing base.

[0081] The connection between the base 61 and the first elastic arm 631 has a first guide surface, so that the mounting structure 60 has one end of the base 61 installed into the groove of the fixing seat.

[0082] A first protrusion 6311 is provided on the side of the first elastic arm 631 away from the base 61 and close to the second elastic arm 632.

[0083] The fixed arm 62 has a second protrusion 621 on one end away from the base 61 and on the side away from the elastic arm 63. The second protrusion 621 has a second guide surface at the connection between the end near the base 61 and the fixed arm 62.

[0084] Preferably, the elastic arm 63 and the fixed arm 62 extend outward from the base 61 at a predetermined angle. That is, the distance between the ends of the fixed arm 62 and the elastic arm 63 near the base 61 is small, and the distance between the ends of the fixed arm 62 and the elastic arm 63 away from the base 61 is large.

[0085] The mounting structure 60 further includes a connector 64, which is disposed within the second gap 630. One end of the connector 64 is connected to the first elastic arm 631, and the other end of the connector 64 is connected to the second elastic arm 632.

[0086] The top of the first elastic arm 631 has a first distance from the base 61, and the top of the second elastic arm 632 has a second distance from the base 61, wherein the first distance is greater than or equal to the second distance.

[0087] In some embodiments, there are multiple connectors 64, and the multiple connectors 64 are arranged sequentially within the second gap 630 along the depth direction of the second gap 630.

[0088] The base 61 has a first space 610, and the fixed arm 62 has a second space 622. An opening communicating with the first space 610 and the second space 622 is provided on the side of the base 61 away from the elastic arm 63. In other words, both the base 61 and the fixed arm 62 have hollow interiors, which increases their deformation resistance and facilitates injection molding.

[0089] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments; any variations or modifications can be made to the implementation of the present invention without departing from these principles.

Claims

1. A torque angle sensor, characterized in that, include: A base shell, the base shell having an installation space and installation channels interspersed with the installation space; A rotor assembly includes a shaft sleeve, an input rotor, and a drive gear. The input rotor and the drive gear are sleeved on the outside of the shaft sleeve, and the shaft sleeve, the input rotor, and the drive gear are injection molded together. The shaft sleeve is installed in the mounting channel, the input rotor is rotatably installed in the mounting space, and the drive gear is located on one side of the base shell. The rotor assembly also includes an induction gear, which is mounted on one side of the base housing and meshes with the drive gear; A circuit board, which is mounted in the mounting space and configured correspondingly to the input rotor; The torque angle sensor also includes a limiting shell, which is disposed on one side of the base shell and forms a limiting channel. The limiting shell has a limiting opening on the side away from the base shell that communicates with the limiting channel. The limiting channel communicates with the mounting channel. The drive gear is rotatably mounted on the limiting channel. The shaft cylinder extends out from the limiting opening after passing through the limiting channel, and the end of the limiting shell with the limiting opening clamps the shaft cylinder. The limiting shell includes an axial limiting plate and a radial limiting plate. One end of the axial limiting plate is connected to the base shell, and the other end extends away from the base shell along the axial direction of the mounting channel. The radial limiting plate extends from the end of the axial limiting plate away from the base shell towards the central axis of the mounting channel, and the radial limiting plate surrounds to form the limiting opening. The limiting shell further includes a plurality of pressure plates, one end of which is connected to the end of the radial limiting plate away from the axial limiting plate, and the other end extends away from the base shell. The radial limiting plate has movable notches on both sides of the pressure plate. The torque angle sensor also includes a mounting structure, which is disposed on one side of the base shell. The mounting structure includes a base, a fixed arm, and an elastic arm. The bottom of the fixed arm is mounted on one end of the base, and the bottom of the elastic arm is mounted on the other end of the base. There is a first gap between the fixed arm and the elastic arm. The elastic arm includes a first elastic arm and a second elastic arm, with a second gap between the first elastic arm and the second elastic arm, and the second elastic arm is located between the first elastic arm and the fixed arm; When the mounting structure is inserted into the groove of the fixing base, the first elastic arm and the fixing arm contact the inner wall of the groove, and the first elastic arm bends toward the direction of the second elastic arm; after the mounting structure is inserted into the groove to a preset depth, the first elastic arm contacts the second elastic arm and pushes the second elastic arm to bend toward the direction of the fixing arm.

2. The torque angle sensor according to claim 1, characterized in that, A clearance notch is provided on one side of the limiting shell corresponding to the position of the sensing gear, and part of the driving gear extends out from the clearance notch and meshes with the sensing gear.

3. The torque angle sensor according to claim 1, characterized in that, The rotor assembly also includes an abutment ring located between the drive gear and the input rotor. The outer side of the abutment ring abuts against the inner wall of the mounting channel, and the abutment ring is injection molded to the drive gear and the input rotor.

4. The torque angle sensor according to claim 3, characterized in that, The input rotor includes a wrapping layer and an induction ring. The induction ring has a zigzag extension structure and includes an outer induction section, an inner connecting section, and a radial connecting section. Along the radial direction of the induction ring, the inner connecting section is closer to the center of the induction ring than the outer induction section. One end of the radial connecting section is connected to the outer induction section, and the other end is connected to the inner connecting section. The wrapping layer wraps the inner connecting section and the radial connecting section, and the inner connecting section has a positioning hole at a predetermined position. The abutment ring has a clearance groove extending along the thickness direction of the abutment ring at the position corresponding to the positioning hole and the tooth groove of the drive gear.

5. The torque angle sensor according to any one of claims 1 to 3, characterized in that, The base shell includes a front shell and a rear shell, which are spliced ​​together to form the installation space. The rear shell has a pressure ring extending into the installation space on the side near the installation space. The circuit board has an clearance opening corresponding to the position of the pressure ring, and the pressure ring passes through the clearance opening to abut against the input rotor.

6. The torque angle sensor according to claim 5, characterized in that, The base shell has a rotating groove on the side near the mounting space, the rotating groove surrounds the mounting channel, and the input rotor is rotatably mounted in the rotating groove.

7. The torque angle sensor according to any one of claims 1 to 3, characterized in that, The base shell has a receiving groove on one side where the driving gear is located, and the sensing gear is rotatably mounted in the receiving groove; The torque angle sensor also includes a cover plate and an elastic rod. The cover plate is adapted to cover the opening of the receiving groove. The connecting end of the elastic rod is connected to the cover plate, and the pressing end of the elastic rod extends obliquely from the cover plate toward the receiving groove. When the cover plate closes to the opening of the receiving groove, the pressing end of the elastic rod presses against the sensing gear.

8. The torque angle sensor according to any one of claims 1 to 3, characterized in that, The input rotor includes a wrapping layer and an induction ring. The induction ring has a zigzag extension structure and includes an outer induction section, an inner connecting section, and a radial connecting section. Along the radial direction of the induction ring, the inner connecting section is closer to the center of the induction ring than the outer induction section. One end of the radial connecting section is connected to the outer induction section, and the other end is connected to the inner connecting section. The wrapping layer wraps the inner connecting section and the radial connecting section, and the inner connecting section has a positioning hole at a predetermined position.

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