JP2006030088A - Torque sensor and construction method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque sensor enhancing detection accuracy through reduction of assembling errors. <P>SOLUTION: A first cylindrical member is equipped with a first locking section prepared on an axial edge, and a second cylindrical member is equipped with a flange section prepared on an edge of the first locking side of the first cylindrical member and a second locking section prepared on this flange section. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a torque sensor that detects a relative rotational displacement (torque) of an input shaft and an output shaft in an electric power steering apparatus.

Conventionally, in a torque sensor, a cylindrical member having a plurality of axial windows is provided on an input shaft connected to a steering wheel, and a fitting member having a plurality of axial projections is provided on an output shaft connected to a rack. The outer periphery of the outer ring is covered with a coil. When the input / output shaft rotates relative to the coil while the magnetic field is generated in the coil, the window of the fitting member is opened and closed by the protrusion, and the amount of magnetic field passing through the window changes. In the prior art, the steering torque is detected by detecting the change in the magnetic field passing amount (see, for example, Patent Document 1). As described above, in the conventional torque sensor, the relative position between the groove (window) of the cylindrical member and the groove of the fitting member is important for the torque detection accuracy.
JP 2001-56258 A

  However, in the above prior art, the cylindrical member is positioned and fixed with respect to the input shaft, and the fitting member is positioned and fixed with respect to the output shaft. Therefore, the relative positions of the cylindrical member and the fitting member are the assembling error between the input shaft and the output shaft, the assembling error between the input shaft and the cylindrical member, and the assembling error between the output shaft and the fitting member. There is a risk that a large error will occur. Further, radial positioning between the cylindrical member and the fitting member is not taken into consideration, and there is a problem that the torque detection accuracy is deteriorated.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a torque sensor in which an assembly error is reduced and torque detection accuracy is improved.

  In order to achieve the above object, in the present invention, a first shaft and a second shaft connected by a torsion bar, a first cylindrical member provided on the first shaft and having a plurality of axial windows in the circumferential direction; A second cylindrical member provided on the second shaft so as to surround the first cylindrical member, formed of a conductive and nonmagnetic material and having a plurality of axial windows in the circumferential direction; An impedance change of the coil that is provided on the outer peripheral side of the cylindrical member and changes based on an overlapping state of a coil that generates a magnetic field and an axial window of the first cylindrical member and an axial window of the second cylindrical member. In the torque sensor for detecting the torque based on the first cylindrical member, the first cylindrical member includes a first locking portion provided at an axial end, and the second cylindrical member is the first locking of the first cylindrical member. At the end A flange portion that is, it was decided and a second locking portion provided in the flange portion.

  Therefore, it is possible to provide a torque sensor that reduces the assembly error and improves the torque detection accuracy.

  Hereinafter, the best mode for realizing the torque sensor of the present invention will be described based on Example 1 shown in the drawings.

  FIG. 1 is a cross-sectional view illustrating a configuration in the vicinity of a torque sensor in the first embodiment. The power steering device is provided at an input shaft 300 connected to a steering wheel (not shown), an output shaft 400 connected to a rack and pinion mechanism for operating a steered wheel, and a connection portion between the input shaft 300 and the output shaft 400. Torque sensor TS. The torque sensor TS includes a sensor housing 10, two coil units 20, an inner ring 100 (first cylindrical member), an outer ring 200 (second cylindrical member), and a substrate 30.

  The input shaft 300, the output shaft 400, and the torque sensor TS are accommodated in a sensor housing 10 and a rack and pinion housing (hereinafter referred to as an R & P housing) 40. The input shaft 300 is made of a magnetic material (steel material in this embodiment), and forms a magnetic field by the coil unit 20. Further, a through hole 310 for receiving the torsion bar 50 is provided in the axis of the input shaft 300. Furthermore, a thick portion 320 is provided that is fixed to the torsion bar 50 on the steering wheel side and holds the inner ring 100.

  The output shaft 400 and the torsion bar 50 are connected by fitting, and the input shaft 300 and the output shaft 400 are integrated via the torsion bar 50. An outer ring holding portion 410 is provided on the outer periphery of the input shaft side end portion of the output shaft 400. The output shaft 400 is rotatably supported by the R & P housing 40 by the second and third bearings 63 and 64.

  Further, a pinion shaft 41 is connected to the output shaft 400, and constitutes a rack and pinion type steering device together with the rack shaft. In the vicinity of the opening of the sensor housing 10 on the steering wheel side, a dust seal 61 for dust prevention and a first bearing 62 are provided in order from the opening.

  The inner ring 100 is a cylindrical member that is fixed to the thick portion 320 of the input shaft 300 and rotates integrally with the input shaft 300. The outer ring 200 is a cylindrical member provided on the outer diameter side of the inner ring 100 and is held by the outer ring holding portion 410 of the output shaft 400 and rotates integrally with the output shaft 400. The inner ring 100 and the outer ring 200 are made of a conductive and nonmagnetic material, and have first and second windows 110 and 210 provided in a plurality in the axial direction.

  The coil unit 20 is accommodated in the sensor housing 10 and is urged to the axial output side by an elastic member 70 provided on the input side, and is fixed by a cylindrical holding member 80 press-fitted from the output side. Positioning in the axial direction is performed while preventing the contact with the substrate 30.

  When the driver performs a steering operation, the degree of overlap between the window of the inner ring 100 and the window of the outer ring 200 changes with the torsion of the torsion bar 50 fixed between the input and output shafts. At this time, the steering torque is calculated by the substrate 30 from the impedance change generated in the coil unit 20. A drive current that generates a steering assist torque that reduces the steering torque based on the calculation result is supplied to an electric motor (not shown).

[Inner ring details]
FIG. 2 is a perspective view of the inner ring 100. The inner ring 100 is a cylindrical member made of a conductive and non-magnetic material (aluminum alloy in Embodiment 1 of the present application), and has a plurality of first windows 110 provided on the cylindrical surface. The first windows 110 have a slit shape in which the axial width is longer than the circumferential width, and two rows are provided at equal intervals on the circumference of the inner ring 100 in the axial direction.

  Further, two first locking portions 130 are provided on the end surface in the y-axis positive direction of the inner ring 100, and a straight line connecting each other is formed so as to pass through the axis of the inner ring 100. The 1st latching | locking part 130 is a substantially triangular-shaped notch, and is made into the substantially triangular shape from a viewpoint of the positioning property and the yield improvement of material. The notch width is a and the notch tip angle is θ. Further, a caulking portion 140 for caulking and fixing the inner ring 100 to the input shaft 300 is provided on the negative axis of the first locking portion 130 in the y-axis negative direction.

  At this time, if the first locking portion 130 and the first window 110 overlap with each other in the axial direction, the deformation of the inner ring 100 due to caulking may affect the first window 110. Therefore, the first locking part 130 and the caulking part 140 are provided at a substantially intermediate position between the first windows 110 to minimize the influence of the deformation of the inner ring 100 due to the caulking on the first window 110. . At the time of assembly, the inner ring 100 and the input shaft 300 and the inner ring 100 and the outer ring 200 are positioned by the first locking portion 130.

  In the first embodiment, the first locking portion 130 is notched, but it may be a convex portion in the positive y-axis direction and is not particularly limited. Further, the straight line connecting the two first locking portions 130 may not be formed so as to pass through the axis of the inner ring 100, and only one line may be provided if positioning by the first locking portion 130 is possible. There is no particular limitation.

[Details of outer ring 200]
FIG. 3 is a perspective view of the outer ring 200. The outer ring 200 is a cylindrical member made of a conductive and non-magnetic material (in the first embodiment, an aluminum alloy), and has a plurality of second windows 210 provided in the axial direction. The second window 210 has a slit shape whose axial width is longer than the circumferential width, is provided at equal intervals in the cylindrical portion of the outer ring 200, and is formed at a position corresponding to the first window 110 of the inner ring 100. Yes.

  Further, a flange portion 220 extending in the inner diameter direction over the circumference is provided at the end portion of the outer ring 200 in the positive y-axis direction. The flange portion 220 is provided with two second locking portions 230 that are arc-shaped notches, and a straight line connecting the second locking portions 230 is formed so as to pass through the axis of the outer ring 200. The notch width b of the second locking part 230 is provided smaller than the width a of the triangular notch of the first locking part 130 of the inner ring 100. Further, since the inner ring 100 is accommodated in the inner diameter portion of the outer ring 200, the extension of the flange portion 220 is set to an extension amount that does not hinder the accommodation of the inner ring 100.

  At the time of assembly, the outer ring 200 and the inner ring 100 are positioned by the second locking portion 230 and the first locking portion 130 of the inner ring 100. Further, an output shaft fitting portion 240 that is fitted to the output shaft 400 is provided at the y-axis negative direction end portion of the outer ring 200.

  In addition, the 2nd latching | locking part 230 should just be provided in the position corresponding to the 1st latching | locking part 130, and the straight line which connects the two 2nd latching | locking parts 230 is formed so that the axial center of the outer ring 200 may pass. The number of the second locking portions 230 may be one and is not particularly limited, as long as the positioning is possible. Further, the flange portion 220 may extend in the outer diameter direction of the outer ring 200 and is not particularly limited.

[Details of input axis]
FIG. 4 is a perspective view of the input shaft 300. As described above, the input shaft 300 is made of a magnetic material (steel material in the present embodiment) and forms a magnetic field by the coil unit 20. A through-hole 310 for receiving the torsion bar 50 is provided at the shaft center of the input shaft 300, and is fixed to the torsion bar 50 on the steering wheel side.

  Two third locking portions 330 are provided at the end of the thick portion 320 of the input shaft 300 in the positive y-axis direction. Since FIG. 4 is a perspective view, only one third locking portion 330 is shown. The third locking portion 330 is an axial groove and has a radial width equal to the width b of the second locking portion 230. Further, the two third locking portions 330 are provided so that a straight line connecting each other passes through the axis of the input shaft 300.

  When assembled, the inner ring 100 and the input shaft 300, and the inner ring 100 and the outer ring 100, the third locking part 330, the first locking part 130 of the inner ring 100, and the second locking part 230 of the outer ring 200. Positioning with the ring 200 is performed.

  Further, a caulking fixing portion 340 for caulking and fixing the inner ring 100 is provided on the thick portion 320 on the axial straight line from the third locking portion 330 in the negative y-axis direction. In addition, since the 3rd latching | locking part 330 should just be provided in the position corresponding to the 1st latching | locking part 130 and the 2nd latching | locking part 230, the straight line which connects the two 3rd latching | locking parts 330 is the input shaft 300. There is no particular limitation as long as it does not have to be formed so as to pass through the axis. Further, as long as positioning is possible in the same manner as the first and second locking portions 130 and 220, the number of the third locking portions 330 may be only one and is not particularly limited.

[Inner ring assembly]
FIG. 5 is an enlarged perspective view of the input shaft 300 in which the inner ring 100 is fitted in the thick part 320. Due to the first window 110 of the inner ring 100 and the surface of the input shaft 300, irregularities are formed on the cylindrical surface of the input shaft 300 into which the inner ring 100 is fitted.

  Since the input shaft 300 is a magnetic steel material and the inner ring 100 is a conductive and non-magnetic aluminum alloy, the magnetic field is large in the first window 110 of the inner ring 100, that is, the recess, and the inner ring 100 is the input shaft 300. The magnetic field is small at the portion covering the projection, that is, at the convex portion. At the time of assembly, the inner ring 100 is fitted into the input shaft 300 so that the positions of the first locking portion 130 of the inner ring 100 and the third locking portion 330 of the input shaft 300 correspond to each other.

  When the inner ring 100 is fitted, the caulking fixing part 340 of the input shaft 300 cannot be seen. However, since the caulking fixing part 340 is on the same straight line as the third locking part 330, the inner ring 100 is inserted. Even so, it is provided so that the position of the caulking fixing portion 340 can be specified.

[Details of positioning jig]
FIG. 6 is a perspective view of a jig 500 used for positioning the first, second, and third locking portions 130, 230, and 330. The jig 500 is a cylindrical member that can be fitted to the thick portion 320 of the input shaft 300, and has two projecting portions 510 that project from the end surface in the y-axis negative direction. The projection 510 and the tip of the projection 510 are formed in a triangular shape with an angle φ, and the tip angle φ is larger than the notch tip angle θ of the first locking portion 130.

  The radial side surface portion 512 of the protruding portion 510 has an arc shape, and the radial side surface portion 512 is a second locking portion so that the second locking portion 230 that is an arcuate cutout of the outer ring 200 can be fitted without a gap. 230 has substantially the same radius of curvature.

  Further, the radial width c of the protruding portion 510 is slightly smaller than the radial width b of the third locking portion 330 so that the circumferential side surface portion 513 and the third locking portion 330 in the protruding portion 510 can be fitted. Is provided. That is, the relationship between the widths a and b of the first and third locking portions 130 and 10 and the radial width c of the protruding portion 510 is a> b> c.

  Since the flange portion 220 of the outer ring 200 extends in the inner diameter direction, the protruding portion 510 of the jig 300 engages the first locking portion 130 by the tip portion 511 and the second locking portion by the radial side surface portion 512. 230 will be engaged. In other words, the tip portion 511 that engages the inner ring 100 and the radial side surface portion 512 that engages the outer ring 200 are both provided in the protruding portion 510, and positioning is performed only by the jig 300, thereby avoiding accumulation of assembly errors. The accuracy is improved.

[Positioning and fixing of inner ring and outer ring]
(First stroke: Input shaft positioning with respect to the jig)
FIG. 7 is a diagram illustrating positioning of the inner ring 100 with respect to the input shaft 300 using the jig 500.
The inner ring 100 is fitted into the thick part 320 of the input shaft 300, and the jig 500 is inserted from the positive direction of the y-axis of the input shaft 300. At this time, insertion is performed so that the protruding portion 510 of the jig 500 faces the negative y-axis direction, and the protruding portion 510 is fitted to the third locking portion 330, whereby the input shaft 300 is moved in the circumferential direction with respect to the jig 500. regulate.

(2nd stroke: Inner ring positioning and fixing)
After fitting the protrusion 510 to the third locking part 330, the first locking part 130 of the inner ring 100 is fitted to the protrusion 510. The notch width a of the first locking part 130 is larger than the radial width c of the protruding part 510, and the tip part 511 of the protruding part 510 enters the first locking part 130, which is a triangular notch. Since the tip angle φ is larger than the notch tip angle θ of the first locking part 130, the protrusion 510 comes into contact with and engages with the notch side part 131 of the first locking part 130 at the tip part 511.

  Accordingly, by restricting the negative y-axis direction and the rotation direction of the first locking part 130 with respect to the protrusion 510, the movement of the inner ring 100 in the rotation direction with respect to the jig 500 is restricted, and the input shaft 300 is interposed via the jig 500. In contrast, the inner ring 100 is positioned. At this time, positioning is performed by caulking the caulking portion 140 of the inner ring 100 to the caulking fixing portion 340 of the input shaft 300 while the jig 500 is engaged with the third locking portion 330 and the first locking portion 130. The inner ring 100 is fixed to the input shaft 300 while maintaining accuracy.

  Since the first locking portion 130 of the inner ring 100 is a substantially triangular notch, the input shaft 300 that is a magnetic body is exposed in the first locking portion 130, and the magnetic field generated by the coil 20 is likely to wrap around. For this reason, the magnetic field balance may be disrupted and the torque detection accuracy may be hindered. However, the third locking portion 330 at a position corresponding to the first locking portion 130 is a groove formed in the thick portion 320 of the input shaft 300. For this reason, the distance between the third locking portion 330 and the coil 20 is increased by an amount corresponding to the groove depth. Since the amount of the magnetic field that wraps around the third locking portion 330 is reduced by the distance, the magnetic field balance is kept stable even if the third locking portion 330 is exposed.

(3rd stroke: Outer ring positioning and fixing)
FIG. 8 is a view showing the positioning of the outer ring 200 by the jig 500. After the inner ring 100 is fixed to the input shaft 300 in the second stroke, the outer ring 200 is inserted into the input shaft 300 from the y-axis negative direction. At the time of insertion, the insertion is performed such that the flange portion 220 of the outer ring 200 faces the positive y-axis direction. At this time, it is assumed that the jig 500 is not moved while the protruding portion 510 is in the positioning state in contact with the first and third locking portions 130 and 10.

  After the outer ring 200 is inserted into the input shaft 300, the second locking portion 230 of the flange portion 220 is engaged with the protruding portion 510 of the jig 500. In engagement, the side surface 221 of the second locking portion 230 having the same curvature and the radial side surface portion 512 of the protruding portion 510 come into contact with each other, so that the outer ring 200 is positioned in the circumferential direction and the radial direction with respect to the jig 500. . Since the relative position of the jig 500 and the input shaft 300 is fixed in the first stroke, the outer ring 200 is positioned in the circumferential direction and the radial direction with respect to the input shaft 300 by the engagement.

  In this state, the outer ring 200 is fixed while maintaining the positioning accuracy by fixing the output shaft fitting portion 240 of the outer ring 200 to the output shaft 400 by caulking. After the outer ring 200 is fixed to the output shaft 400, the jig 500 is detached and the positioning and fixing of the inner ring 100 and the outer ring 200 are completed.

[Contrast of effects of conventional example and first embodiment]
Conventionally, in a torque sensor, a cylindrical member having a plurality of windows is provided on an input shaft, and a fitting member having a groove for shielding a plurality of windows is provided on an output shaft. Some of them detect a steering torque by detecting a change in the amount of coil magnetic field passing through a window. In this technique, the relative position between the window of the cylindrical member and the groove of the fitting member is an important factor for torque detection accuracy.

  However, in the above prior art, the cylindrical member is positioned and fixed with respect to the input shaft, and the fitting member is positioned and fixed with respect to the output shaft. Therefore, the assembly between the input shaft and the output shaft is performed. Accumulation of errors, an assembly error between the input shaft and the cylindrical member, and an assembly error between the output shaft and the fitting member may cause a large error in the relative position between the cylindrical member and the fitting member. Further, radial positioning between the cylindrical member and the fitting member is not taken into consideration, and there is a problem that the torque detection accuracy is deteriorated.

  On the other hand, in the embodiment of the present application, a first locking portion 130 that is a triangular cutout is provided at the end of the inner ring 100 in the y-axis negative direction, and the outer ring 200 extends in the inner diameter direction at the end of the y-axis positive direction. A flange portion 220 is provided, and a second locking portion 230 that is an arcuate notch is provided on the flange portion 220.

  Further, when assembling, the first step of engaging the radial side surface portion 512 with the third locking portion 330 and the front end portion 511 of the protruding portion 510 of the jig 500 are engaged with the first locking portion 130. In the second state, the inner ring 100 is fixed to the input shaft 300, and the front end portion 511 and the radial side surface portion 512 of the protrusion 510 are engaged with the first locking portion 130 and the third locking portion 330, respectively. In this state, the inner ring 100 and the outer ring are formed by the third step of engaging the radial side surface portion 512 of the protrusion 510 of the jig 500 with the second locking portion 230 and fixing the outer ring 200 to the output shaft 400. 200 positioning and fixing were performed.

Thereby, the inner ring 100 and the outer ring 200 can be positioned with respect to the input shaft 300 by the jig 500, and accumulation of positioning errors of the inner ring 100 and the outer ring 200 can be avoided to improve the accuracy. Further, since the second locking portion 230 is provided in the flange portion 220 extending in the inner diameter direction of the outer ring 200, the outer ring 200 can be positioned in the radial direction as well as in the rotational direction, and an assembly error can be caused. Thus, a torque sensor with improved torque detection accuracy can be provided (corresponding to claims 1 and 2).
(Other examples)

  As described above, the best mode for carrying out the present invention has been described based on the first embodiment. However, the specific configuration of the present invention is not limited to each embodiment and does not depart from the gist of the present invention. Such design changes are included in the present invention.

  In the present embodiment, the inner ring 100 and the outer ring 200 are fixed to the input shaft and the output shafts 300 and 400 by caulking, respectively, but may be fixed by shrink fitting or press fitting.

  In the embodiment of the present application, the inner ring 100 is formed of a conductive and nonmagnetic aluminum alloy, but may be formed of a magnetic material (for example, steel). When formed of a magnetic material, the magnetic force is small in the first window 110 of the inner ring 100, that is, the concave portion, and the magnetic force is large in a portion where the inner ring 100 covers the input shaft 300, that is, the convex portion.

  In the present embodiment, two each of the first, second, and third locking portions 130, 230, and 330 are provided, but it is sufficient that the inner ring 100 and the outer ring 200 can be positioned with respect to the input shaft 300. Each may be one or two or more. If the number is one, the number of processing steps can be reduced, and if the number is two or more, the positioning accuracy can be further improved.

  Further, technical ideas other than the claims that can be grasped from the respective embodiments will be described below together with the effects thereof.

(A) In the torque sensor according to claim 1,
The first locking portion is a substantially triangular cutout.

  Due to the wedge effect, the rotational direction positioning system between the first locking portion and the first engaging portion of the jig is improved. In addition, the yield of the material is better than the case where it is formed in the shape of a protrusion due to the notch shape.

(B) In the torque sensor according to claim 1,
The flange portion of the second cylindrical member extends radially inward.

  In order to perform the radial positioning of the first cylindrical member and the second cylindrical member by engaging the jig inserted between the first cylindrical member and the second cylindrical member with the second locking portion of the flange portion, The first engaging portion and the second engaging portion of the jig can be provided on the same member. Therefore, the positioning accuracy is improved as compared with the case where the first engaging portion and the second engaging portion of the jig are provided on separate members.

(C) In the torque sensor according to claim 1,
The first shaft includes a third locking portion at a position corresponding to the first locking portion of the first cylindrical member, and includes a recess on the same axis line of the third locking portion,
The first cylindrical member has a caulking portion that fits into the concave portion of the first shaft.

  The caulking concave portion of the first shaft is not visible when the first cylindrical member is covered. Therefore, although the caulking position cannot be specified, the position of the concave portion can be specified by providing the third locking portion on the same axis line of the caulking concave portion. Further, by using a jig that engages with both the third locking portion and the first locking portion of the first shaft, the rotational positioning of the first shaft and the first cylindrical member can be easily performed.

(D) In the torque sensor according to claim 1,
The first locking portion of the first cylindrical member is formed at a substantially intermediate position between the axial windows of the first cylindrical member.

  Since the first locking portion corresponds to the caulking position of the first cylindrical member, the caulking position is a substantially intermediate position between the axial windows of the first cylindrical member. Therefore, it is possible to minimize the deformation of the first cylindrical member due to caulking to the axial window.

(E) In the torque sensor according to (a) above,
The third locking portion is an axial groove.

  When the first cylindrical member is formed of a conductive and non-magnetic material and the first shaft is formed of a magnetic member, if the first locking portion is formed in a notch shape, a magnetic field is likely to flow around the notch, The overall magnetic field balance may be lost. Therefore, by providing an axial groove at a position corresponding to the notch, the distance between the groove and the coil is reduced, and the amount of magnetic field wrap-around is reduced. Therefore, the notch of the first locking portion and the axial groove of the third locking portion can balance the amount of magnetic field wrap.

It is sectional drawing showing the structure of a torque sensor vicinity. It is a perspective view of an inner ring. It is an axial side view of an outer ring. It is a perspective view of an input shaft. It is an expansion perspective view of the input shaft which fitted the inner ring. It is a perspective view of a jig. It is a figure which shows positioning of the inner ring by a jig. It is a figure which shows positioning of the outer ring by a jig.

Explanation of symbols

20 Coil unit 50 Torsion bar 100 Inner ring 110 First window 130 First locking part 131 Notch side surface part 140 Caulking part 200 Outer ring 210 Second window 220 Flange part 221 Side surface 230 Second locking part 240 Output shaft fitting part 300 Input shaft 310 Through-hole 320 Thick part 330 Locking part 340 Caulking fixing part 400 Output shaft 410 Outer ring holding part 500 Jig 510 Protruding part 511 Tip part 512 Radial side part 513 Circumferential side part

Claims (2)

A first shaft and a second shaft connected by a torsion bar;
A first cylindrical member provided on the first shaft and having a plurality of axial windows in the circumferential direction;
A second cylindrical member provided on the second shaft so as to surround the first cylindrical member, formed of a conductive and nonmagnetic material, and having a plurality of axial windows in the circumferential direction;
A coil that is provided on the outer peripheral side of the second cylindrical member and generates a magnetic field;
In the torque sensor for detecting torque based on the impedance change of the coil that changes based on the overlapping state of the axial window of the first cylindrical member and the axial window of the second cylindrical member,
The first cylindrical member includes a first locking portion provided at an axial end.
The second cylindrical member includes a flange portion provided at an end portion of the first cylindrical member on the first locking portion side, and a second locking portion provided on the flange portion. Torque sensor. A first shaft and a second shaft connected by a torsion bar;
A first cylindrical member provided on the first shaft and having a plurality of axial windows in the circumferential direction;
A second cylindrical member provided on the second shaft so as to surround the first cylindrical member, formed of a conductive and nonmagnetic material, and having a plurality of axial windows in the circumferential direction;
A coil that is provided on the outer peripheral side of the second cylindrical member and generates a magnetic field;
In a method for assembling a torque sensor for detecting torque based on a change in impedance of the coil that changes based on an overlapping state between the axial window of the first cylindrical member and the axial window of the second cylindrical member,
Engaging the first engaging portion of the jig including the first engaging portion and the second engaging portion that engage with the first engaging portion and the second engaging portion, respectively, with the first engaging portion. The first step
A second step of fixing the first cylindrical member to the first shaft in a state where the first engaging portion is engaged with the first locking portion;
The jig is engaged with the second engaging portion and the second engaging portion, and the first engaging portion and the second engaging portion of the jig are respectively connected to the first engaging portion and the second engaging portion. A third step of fixing the second cylindrical member to the second shaft in an engaged state;
A method for assembling a torque sensor, comprising:

Images