CN212871562U

CN212871562U - Torque sensor

Info

Publication number: CN212871562U
Application number: CN202021271243.6U
Authority: CN
Inventors: 张智; 袁玉斌; 林志鹏
Original assignee: Ninebot Beijing Technology Co Ltd
Current assignee: Beijing zero Innovation Technology Co.,Ltd.; Nanbo (Beijing) Technology Co., Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-04-02
Anticipated expiration: 2030-07-01

Abstract

The embodiment of the utility model provides a torque sensor, which comprises a shell, wherein two first distance sensors are arranged on the shell at intervals along the length direction; the torsion shaft is sleeved in the shell and can rotate along the circumferential direction relative to the shell; the torsion barrel is positioned between the shell and the torsion barrel and fixedly sleeved outside the torsion shaft; two induction gears are concentrically arranged in the axial direction of the torque barrel, and each induction gear corresponds to the position of one first distance sensor; the angle detection device comprises a detection cam and a second distance sensor; the detection cam is concentrically sleeved on the torsion barrel; the second distance sensor is arranged on the shell and corresponds to the position of the detection cam; along the axial direction of the torque barrel, each sensing tooth on the two sensing gears is provided with a corresponding target area on the outer contour line of the detection cam, and the distance range values between different target areas and the second distance sensor are different.

Description

Torque sensor

Technical Field

The utility model relates to a mechanical detection technical field especially relates to a torque sensor.

Background

The torque sensor is a detection device for sensing torsional moment on various rotating or non-rotating mechanical parts, and can convert the physical change of the torsional force into an accurate electric signal. For example, a torque sensor based on the principle of torsional angle phase is a torque sensor commonly used at present.

However, when the existing torque sensor based on the torsion angle phase principle is used, data deviation often occurs, so that the detection result is inaccurate, and the user experience is not good.

SUMMERY OF THE UTILITY MODEL

Embodiments of the present invention have been made in view of the above problems, and provide a torque sensor that solves or improves the above problems.

In an embodiment of the present invention, there is provided a torque sensor, including:

the device comprises a shell, a first sensor and a second sensor, wherein the shell is provided with two first distance sensors at intervals along the length direction;

the torsion shaft is sleeved in the shell and can rotate along the circumferential direction relative to the shell;

the torsion barrel is positioned between the shell and the torsion shaft and fixedly sleeved outside the torsion shaft; two induction gears are concentrically arranged in the axial direction of the torque barrel, and each induction gear corresponds to the position of one first distance sensor;

the angle detection device comprises a detection cam and a second distance sensor; the detection cam is concentrically sleeved on the torsion barrel; the second distance sensor is arranged on the shell and corresponds to the position of the detection cam;

each sensing tooth on the two sensing gears is provided with a corresponding target area on an outer contour line of the detection cam along the axial direction of the torque barrel, and the distance range values between different target areas and the second distance sensor are different.

Optionally, the detection cam is located on the same side of the two sensing gears; or

The detection cam is positioned between the two induction gears.

Optionally, a base point position is arranged on the outer contour of the detection cam, and outer contour lines of the detection cam located at two ends of the base point position are in an archimedes spiral shape.

Optionally, the first distance sensor and the second distance sensor are both eddy current sensors.

Optionally, the second distance sensor comprises a probe coil, different target areas having different distances from the probe coil.

Optionally, each tooth crest and/or tooth valley on the two sensing gears has a corresponding target position on the outer contour line of the detection cam, and different target positions have different distance values from the second distance sensor.

Optionally, the housing is further provided with a control panel, and the two first distance sensors and the second distance sensor are integrated on the control panel.

Optionally, a control unit for performing signal error compensation according to the received distance signal is further disposed on the control board, and the control unit is in communication connection with the two first distance sensors and the second distance sensor respectively.

Optionally, two opposite ends of the torsion shaft in the axial direction are respectively provided with a connecting portion, wherein at least one of the connecting portions is connected with a rotating shaft of an external device.

Additionally, optionally, at least one of the connecting portions extends outwardly beyond the housing.

The embodiment of the utility model provides an among the technical scheme, can detect the absolute angle position of the response tooth on each response gear through angle detection device to there is the error in the response tooth of demarcating on two response gears, corrects the compensation with the signal that has the error, reachs more accurate signal data.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a torque sensor according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a torsion shaft and a torsion barrel according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a position between the first distance sensor and the sensing gear according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an angle detection apparatus according to an embodiment of the present invention;

fig. 5 is a schematic diagram of the induction teeth of the induction gear according to the embodiment of the present invention corresponding to the target area on the detection cam;

fig. 6 to 8 are schematic views of position structures of different detection cams and sensing gears according to embodiments of the present invention;

fig. 9 is a schematic diagram illustrating a relationship between a distance between the second distance sensor and an outer contour line of the detection cam and a rotation angle of the detection cam according to an embodiment of the present invention.

Detailed Description

In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The inventor finds in practice that in the prior art, when the torque sensor based on the torsion angle phase principle is used, data deviation often occurs, and therefore the detection result is inaccurate.

The reason for this is that, in the existing torque sensor based on the torsional angle phase principle, the component for completing the detection mainly comprises a torque barrel and two eddy current sensors, etc., two ends of the torque barrel are respectively provided with a same gear (teeth are arranged correspondingly), and the two eddy current sensors output different signals by sensing the distance between the tooth tops and tooth sockets of the respective corresponding gears. Theoretically, the distances between the two eddy current sensors and the corresponding gears are the same, so the obtained signals should be the same, but actually, due to machining errors and assembly errors, the distances between the eddy current sensors and the corresponding gears are deviated, and the data are not accurate enough.

Therefore, to the above problem, the embodiment of the utility model provides a torque sensor detects absolute angle position through angle detection device, just so can mark concrete which position has the error to compensate the position that has the error, in order to reachd better signal data.

It should be noted that, in the description of the present invention, the terms "first" and "second" are only used for convenience in describing different components or names, and are not to be construed as indicating or implying a sequential relationship, relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Fig. 1 is the embodiment of the present invention provides a torque sensor's schematic structural diagram, fig. 2 is the embodiment of the present invention provides a torsion shaft's schematic structural diagram, fig. 3 is the embodiment of the present invention provides a position schematic structural diagram between first distance sensor and the induction gear, fig. 4 is the embodiment of the present invention provides an angle detection device's schematic structural diagram, refer to fig. 1 to fig. 4 and show.

In an embodiment of the present invention, there is provided a torque sensor, including: the device comprises a shell 10, a torsion shaft 20, a torsion barrel 30 and an angle detection device.

Referring to fig. 1 to 3, two first distance sensors 32 are provided on the housing 10 at intervals along the length direction (the first distance sensors 32 are not shown in fig. 1, and the positional relationship between the first distance sensors 32 and the sensing gear 31 can be referred to in fig. 3). The torsion shaft 20 is sleeved in the housing 10 and can rotate in the circumferential direction relative to the housing 10.

Referring to fig. 2, the torsion barrel 30 is located between the housing 10 and the torsion shaft 20 and is fixedly sleeved outside the torsion shaft 20; two induction gears 31 are concentrically arranged in the axial direction of the torque barrel 30, and each induction gear 31 corresponds to the position of one first distance sensor 32.

Referring to fig. 4, the angle detecting means includes a detecting cam 40 and a second distance sensor 41. The detection cam 40 is concentrically sleeved on the torque barrel 30; the second distance sensor 41 is provided on the housing 10 and corresponds to the position of the detection cam 40.

Referring to fig. 5, each of the sensing teeth of the two sensing gears 31 has a corresponding target area on the outer contour line of the detection cam 40 in the axial direction of the torque barrel 30, and the distance range values between different target areas and the second distance sensor 41 are different.

The embodiment of the utility model provides an among the technical scheme, can detect the absolute angle position of the response tooth on each response gear 31 through angle detection device to there is the error in the response tooth of demarcating on two response gears 31, and then corrects the compensation to the signal that has the error, reachs more accurate signal data.

For example, in an ideal situation, the two sensing gears 31 have the same structure, the sensing teeth of the two sensing gears 31 are correspondingly arranged, and the two first distance sensors 32 sense the respective sensing gears 31 to output sensing signals, for example, when the torsion bar 20 rotates, the torsion bar 30 rotates synchronously with the torsion bar 20, and when the sensing gears 31 rotate with the torsion bar 30, the first distance sensors 32 can sense the distances between the peaks and valleys and the first distance sensors 32 at intervals to output different sensing signals, such as distance signals. In an ideal state, the two first distance sensors 32 sense the same distance to the corresponding sensing gears 31, so the sensing signals obtained should be the same.

However, in practical applications, the sensing gear 31 may have machining errors and assembling errors when being machined and assembled on the torque barrel 30. When the angle detection device is not arranged, when the two first distance sensors 32 sense the respective corresponding sensing gears 31, the distances from the two first distance sensors 32 to the corresponding sensing gears 31 may be different, and the distances from the two first distance sensors 32 to the corresponding sensing gears 31 may deviate, so that the data obtained by the torque sensor is not accurate enough.

After the angle detecting device is disposed on the torque sensor, although there may be machining errors and assembly errors between the two sensing gears 31, when the two first distance sensors 32 sense the respective sensing gears 31, there is a deviation in the sensed distances of the two first distance sensors 32. However, referring to fig. 5, each of the sensing teeth on the two sensing gears 31 has a corresponding target area on the outer contour line of the detection cam 40, and the distance range values between the different target areas and the second distance sensor 41 are different. As shown in fig. 4, d represents a distance value between the detection cam 40 and the second distance sensor 41, and in fig. 5, the sensing tooth a corresponds to an a 'region on the detection cam 40, and the sensing tooth B corresponds to a B' region on the detection cam 40. If there is no error between the two sensing gears 31, the sensing teeth corresponding to the two sensing gears 31 correspond to the same target area, and the distances of the target areas of the detection cam 40 sensed by the second distance sensor 41 are the same, i.e., the values of d are the same. If there is an error between the two sensing gears 31, the sensing gear with a deviation in position is determined according to the distance signal sent by the second distance sensor 41, and the position of the sensing gear is known. Thus, the position of the sensing teeth on the sensing gear 31 can be known according to the different distances, i.e., the different values of d, of the sensing cam 40 sensed by the second distance sensor 41. The absolute angle position of the induction teeth on each induction gear 31 can be detected through the angle detection device, so that errors exist in the induction teeth on the two induction gears 31, and then the signals with the errors are corrected and compensated to obtain more accurate signal data.

The torque sensor provided by the embodiment of the present invention is described in further detail below.

In an embodiment of the present invention, the sensing teeth generally have a certain width, and therefore, the target area corresponding to the sensing teeth can be a section on the outer contour line of the detection cam 40, and when one sensing tooth is calibrated, the distance between the different target area and the second distance sensor 41 is a range value. However, when the induction teeth are calibrated through the range values, calibration errors are easily increased, and correction and compensation are inaccurate. Therefore, in the embodiment of the utility model provides an in, still can mark the response tooth through the position of mark to it is more accurate to make detection distance. Specifically, each of the peaks and/or valleys of the two sensing gears 31 has a corresponding target position on the outer contour line of the detection cam 40, and the different target positions have different distance values from the second distance sensor 41. The target position is a point, and the point can be the tooth crest position of the sensing tooth, the tooth valley position, or both the tooth crest position and the tooth valley position. The tooth crest and/or the tooth valley are calibrated through the target position, the distance between different target positions and the second distance sensor 41 is a distance value, and calibration errors cannot exist, so that the calibration is more accurate, and more accurate signal data can be obtained when the subsequent correction compensation is carried out on the distance signal with errors.

It should be noted that, in the embodiment of the utility model, can mark the response tooth through the regional or the position of mark alone, perhaps also can mark the response tooth through the regional of mark, carry out the check calibration to the response tooth through the position of mark to make and mark more accurate.

In the embodiment of the present invention, referring to fig. 1, one way to realize the housing 10 is that the housing 10 is a cylindrical structure, the housing 10 is sleeved on the outside of the torsion shaft 20, and the sensing gear 31 and the detecting cam 40 are covered and buckled in the housing 10. The housing 10 is concentrically arranged with the torsion shaft 20 and the torsion barrel 30, the torsion shaft 20 is rotatable around a rotation axis in a circumferential direction with respect to the housing 10, and the torsion barrel 30 is rotated in synchronization with the torsion shaft 20.

Further, with continued reference to fig. 1, in an embodiment of the present invention, a control board 11 is further disposed on the housing 10, and the two first distance sensors 32 and the second distance sensor 41 are integrated on the control board 11. Control panel 11 includes but not limited to be the PCB Board (Printed Circuit Board), control panel 11 extends along the length direction of shell 10, and along the length direction of shell 10, control panel 11 passes through the region at two first distance sensor 32 and second distance sensor 41, control panel 11's coverage area includes the region at two first distance sensor 32 and second distance sensor 41 promptly, so that two first distance sensor 32 and second distance sensor 41 are all integrated on control panel 11, make things convenient for first distance sensor 32 and second distance sensor 41's installation and location, also can guarantee through control panel 11 that first distance sensor 32 and second distance sensor 41 are located same horizontal plane, guarantee distance sensing's accuracy. Meanwhile, the first distance sensor 32 and the second distance sensor 41 can realize signal transmission through the control board 11, reduce noise and signal attenuation of signals, and ensure accuracy of signal transmission.

Further, for the processing of realization to the signal, the embodiment of the utility model provides an in, still be equipped with on the control panel 11 and be used for carrying out the control unit of signal error compensation according to received distance signal, control unit is connected with two first distance sensor 32 and the communication of second distance sensor 41 respectively. The control unit includes but is not limited to be the singlechip, the control unit can receive the distance signal that two first distance sensors 32 and second distance sensor 41 sent respectively, compare out whether the distance signal that two first distance sensors 32 inducted has the signal deviation, if there is the deviation, then send the distance signal according to second distance sensor 41, judge the induction tooth that the position has the deviation, the control unit also knows this induction tooth position, just can accurately carry out signal error compensation, in order to reachd better signal data. Namely, the control unit can mark the specific position of the sensing teeth with errors, and the control unit performs signal compensation on the position with errors to obtain better signal data.

The embodiment of the present invention provides an embodiment, the setting position of the detection cam 40 is not specifically limited, and the rotation can be concentric with the synchronization of the torque barrel 30 and the induction gear 31. One of the positions of the detection cam 40 is, referring to fig. 2 and 6, that the detection cam 40 is located on the same side of the two sensing gears 31, for example, in fig. 2, the detection cam 40 may be located on the left side of the two sensing gears 31, and of course, referring to fig. 6, the detection cam 40 may also be located on the right side of the two sensing gears 31. The detecting cam 40 is arranged on the torque barrel 30 and rotates synchronously with the torque barrel 30, the second distance sensor 41 is arranged opposite to the detecting cam 40 and is used for detecting the distance between the outer contour of the detecting cam 40 and the second distance sensor 41, and when the detecting cam 40 rotates, the distance range values between different target areas and the second distance sensor 41 are different, so that different induction teeth are calibrated.

Another way of positioning the detection cam 40 is to position the detection cam 40 between two sensing gears 31, see fig. 7 and 8. For example, referring to fig. 7, it may be disposed beside the sensing gear 31 closer to the left position, or, referring to fig. 8, it may be disposed beside the sensing gear 31 closer to the right position, and of course, it may be disposed at a middle position of the two sensing gears 31 with an equal distance from the two sensing gears 31. In this arrangement, the detection cam 40 does not occupy additional space, i.e., the length of the torsion barrel 30 is not increased, and the length of the casing 10 is not increased. Compared with the above-mentioned manner of disposing the two sensing gears 31 on the same side, the torque barrel 30 and the housing 10 may be disposed in a shorter structure, so as to shorten the length of the entire torque sensor, so that the torque sensor can be adapted to more installation environments.

With continued reference to fig. 4, in the embodiment of the present invention, a realizable manner of the detecting cam 40 is to provide a base point position on the outer contour of the detecting cam 40, such as the P point position in fig. 4, which is the base point position of the outer contour of the detecting cam 40, and the outer contour lines of the detecting cam 40 at both ends of the base point position are in the shape of archimedes spiral. An archimedean spiral, also known as a constant velocity spiral, is a trajectory produced by a point moving away from a fixed point at a constant velocity and simultaneously rotating around the fixed point at a constant angular velocity. When the detection cam 40 rotates concentrically with the torque barrel 30, the outer contour of the detection cam 40 is formed in an archimedean spiral shape, and thus the distance between the second distance sensor 41 and the outer contour of the detection cam 40 changes linearly within 360 degrees.

The relationship between the distance between the second distance sensor 41 and the outer contour line of the detection cam 40 and the rotation angle of the detection cam 40 is schematically shown in fig. 9. The rotation angle of the detection cam 40 is an angle between a line connecting the base point position and the center point of the detection cam 40 and a line connecting the second distance sensor 41 and the center point of the detection cam 40 in the rotation direction.

In fig. 9, when the rotation angle of the detection cam 40 is 0 degree, that is, the base point position on the detection cam 40 corresponds to the position of the second distance sensor 41, at this time, the connecting line between the base point position and the center point of the detection cam 40, and the connecting line between the second distance sensor 41 and the center point of the detection cam 40 overlap each other, and the distance between the second distance sensor 41 and the outer contour line of the detection cam 40 is the minimum. When the detection cam 40 rotates with the torque barrel 30, as counterclockwise in fig. 4, as the detection cam 40 rotates, the rotation angle of the detection cam 40 becomes larger as the rotation angle of the detection cam 40 becomes larger, the distance between the second distance sensor 41 and the outer contour line of the detection cam 40 becomes gradually larger, and when the detection cam 40 rotates to the base point position, the distance between the second distance sensor 41 and the outer contour line of the detection cam 40 becomes directly smallest.

Referring to fig. 5 in conjunction with fig. 9, each sensing tooth on the two sensing gears 31 has a corresponding target area on the outer contour line of the detection cam 40 along the axial direction of the torque barrel 30, so that the position of the sensing tooth can be accurately known according to the detection cam 40, and for the sensing tooth with a deviation position, the controller also knows the position of the sensing tooth, and can accurately perform signal compensation.

In the embodiment of the present invention, the first distance sensor 32 and the second distance sensor 41 can be implemented in a plurality of ways, for example, the first distance sensor 32 and the second distance sensor 41 can be implemented in a way that the first distance sensor 32 and the second distance sensor 41 are both eddy current sensors. The induction gear 31 and the detection cam 40 are made of metal conductor materials, and the eddy current sensor can statically and dynamically measure the distance between a detected metal conductor and the surface of the probe in a non-contact manner, high linearity and high resolution manner. Specifically, the second distance sensor 41 includes probe coils, and the distances between different target areas and the probe coils are different. The eddy current sensor can accurately measure the static and dynamic relative displacement change between the detection cam 40 and the end face of the probe coil. When the eddy current sensor works for a long time, the eddy current sensor has the advantages of good reliability, high sensitivity, strong anti-interference capability, non-contact measurement, high response speed and no influence of media such as oil, water and the like.

The embodiment of the utility model provides an in, first distance sensor 32 and second distance sensor 41 except that accessible eddy current sensor realizes, still can realize through optics distance sensor, infrared distance sensor and ultrasonic wave distance sensor, and first distance sensor 32 and second distance sensor 41 accessible same type's distance sensor realizes, also can realize through the distance sensor of different grade type, the embodiment of the utility model provides an in do not specifically limit, as long as can satisfy the distance detection can.

Further, with continued reference to fig. 1 and fig. 2, in the embodiment of the present invention, the torsion shaft 20 is provided with connecting portions 21 at opposite ends along the axial direction, wherein at least one of the connecting portions 21 is connected to the rotating shaft of the external device. When the torque sensor is used, the housing 10 is fixed, and the torsion shaft 20 is driven by an external device to rotate, so as to rotate in the circumferential direction relative to the housing 10. Further, to better effect the connection with the external device, at least one of the connection portions 21 extends outwardly beyond the housing 10. In order to better realize the connection with the external device, a clamping groove is arranged on the radial direction of the connecting part 21, or the cross section of the connecting part 21 can be in a triangular, rectangular, cross-shaped, polygonal and other structures, so that after the connecting part is connected with the external device, the synchronous rotation can be better realized.

For example, in the embodiment of the present invention, the torque sensor can be applied to a bicycle, the housing 10 is fixed, the connecting portion 21 of the torsion shaft 20 can be connected to the crankshaft of the pedal portion, the pedal portion can drive the torsion shaft 20 to rotate through the crankshaft, and the torsion shaft 20 is provided with the spline 22. In an embodiment, the torsion barrel 30 is fixedly sleeved on the middle portion of the torsion shaft 20, the torsion barrel 30 and the torsion shaft 20 rotate synchronously, and the sensing gear 31 is disposed on the outer wall of the torsion barrel 30. The pedal part is the pedal of the bicycle, the pedal part drives the torsion shaft 20 to rotate through the crankshaft, when the pedal part is stepped on by foot, the torque applied to the torsion shaft 20 is transmitted to the torsion barrel 30 and then transmitted to the spline 22, the spline 22 is sleeved with the chain wheel, and then transmitted to the rear wheel of the bicycle through the chain to drive the rear wheel. Meanwhile, when the torque applied to the torsion shaft 20 is transmitted to the torsion barrel 30, the absolute angle position of the sensing teeth on each sensing gear 31 can be detected by the angle detection device, so that whether errors exist in the sensing teeth on the two sensing gears 31 is calibrated, and if errors exist, the signals with the errors are corrected and compensated, and more accurate signal data are obtained.

It should be noted that, the embodiment of the utility model provides an angle detection device except can using on torque sensor, still can use on other equipment that need the absolute position of angle detection such as motor, when using on other equipment, can refer to the mode of setting when using on torque sensor, and here no longer gives unnecessary details one by one.

To sum up, the embodiment of the utility model provides a technical scheme, every response tooth on two response gears all has the target region that corresponds on the outline line that detects the cam, and the different target region is different with the distance range value between the second distance sensor. According to the different distances of the detection cam sensed by the second distance sensor, the positions of the sensing teeth on the sensing gear are obtained. The absolute angle position of the induction teeth on each induction gear can be detected through the angle detection device, so that errors exist in the induction teeth on the two induction gears, and then the signals with the errors are corrected and compensated to obtain more accurate signal data.

It should be noted that, although the specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention should not be construed as limited to the scope of the present invention. Various modifications and changes may be made by those skilled in the art without inventive work within the scope of the present invention as described in the claims.

The examples of the embodiment of the present invention are intended to concisely illustrate the technical features of the embodiments of the present invention, so that a person skilled in the art can visually understand the technical features of the embodiments of the present invention, and do not act as an improper limitation of the embodiments of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A torque sensor, comprising:

2. The torque transducer of claim 1, wherein the sensing cam is located on the same side of both of the sensing gears; or

The detection cam is positioned between the two induction gears.

3. The torque sensor according to claim 1, wherein a base point position is provided on an outer contour of the detection cam, and outer contour lines of the detection cam located at both ends of the base point position are in an archimedean spiral shape.

4. The torque sensor of claim 1, wherein the first and second distance sensors are each eddy current sensors.

5. The torque sensor of claim 4, wherein the second distance sensor comprises a probe coil, different ones of the target areas having different distances from the probe coil.

6. The torque sensor according to claim 1, wherein each crest and/or valley on both of the sensing gears has a corresponding target position on the outer contour line of the detection cam, different target positions having different distance values from the second distance sensor.

7. The torque sensor according to any one of claims 1 to 6, wherein a control board is further provided on the housing, and both the first distance sensor and the second distance sensor are integrated on the control board.

8. The torque sensor according to claim 7, wherein a control unit for performing signal error compensation according to the received distance signal is further disposed on the control board, and the control unit is in communication connection with the two first distance sensors and the second distance sensor, respectively.

9. The torque sensor according to any one of claims 1 to 6, wherein the torsion shaft is provided with connecting portions at opposite ends thereof in the axial direction, respectively, at least one of the connecting portions being connected to a rotating shaft of an external device.

10. The torque transducer of claim 9, wherein at least one of the connecting portions extends outwardly beyond the housing.