JP2000055754A - Torque detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a torque detecting device that can detect a torque with simple structure, has a temperature compensation function, and further provides a multiple safety function. SOLUTION: An element body 3 that is elastically deformed for the relative displacement between the surface of an upper shaft 1 and that of a lower shaft 2, and a movable magnetic element 5 including a wing 4 with soft magnetism where inclination in a shaft direction changes due to the elastic deformation while being supported by the element body 3, are provided. The inclination of the wing 4 is detected by coils 6a-6d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque detector for detecting a torque when an external force is applied to a rotating shaft in a non-contact manner, such as a power steering mechanism of an automobile.

[0002]

2. Description of the Related Art In a power steering mechanism of an automobile, it is necessary to detect a torque applied to a steered wheel in order to determine an amount of power assist. As a torque detecting device for this purpose, for example, there is a torque detecting device disclosed in Japanese Utility Model Laid-Open No. 1-180737. As shown in FIG. 7, the torque detecting device includes an upper shaft 101 to which a steering wheel (not shown) is attached, a lower shaft 102 to which a pinion gear (not shown) of the steering mechanism is attached, an upper shaft 101 and a lower shaft 102. A torsion bar 103 provided on the central axis of the upper shaft 10 for elastically connecting the two shafts in the twisting direction;
105 for rotatably supporting the motor 1 through a bearing 104, and a bobbin 106 provided in the case 105.
First and second movable magnetic cylinders 107 and 108 each made of a soft magnetic material fixed to the upper shaft 101, and third and second movable magnetic cylinders 107 and 108 each made of a soft magnetic material fixed to the lower shaft 102.
Fourth movable magnetic cylinders 109 and 110, and first to fourth coils 111 and 112 wound around a bobbin in case 105;
113 and 114 are provided.

The first and third movable magnetic cylinders 107, 10
9 are opposed in the axial direction, and first and second teeth 107a and 109a are provided on the facing surface. The first coil 111 is provided so as to surround the facing portion.
On the other hand, the second and fourth movable magnetic cylinders 108 and 110 also face each other, and the facing surfaces thereof have the second and fourth tooth portions 108.
a, 110a are provided respectively. The second coil 112 is arranged so as to surround the facing portion. The third and fourth coils 113 and 114 are connected to the lower shaft 1.
02, the third and fourth movable magnetic cylinders 109, 11
0 is provided.

Next, the operation of the above conventional example will be described. When torque from the steered wheels is applied to the upper shaft 101, a torsional deformation occurs in the torsion bar 103, and the first movable magnetic cylinder 107 and the third movable magnetic cylinder 109 fixed to the upper shaft 101 and the lower shaft 102, respectively. , And between the second movable magnetic cylinder 108 and the fourth movable magnetic cylinder 110. First, the operation between the first and third movable magnetic cylinders 107 and 109 will be described. Since the opposing area of the magnetic path between the teeth 107a and 109a provided on each movable magnetic cylinder changes, the first Coil 1
11, the inductance changes. By detecting this change in inductance by a detection circuit (not shown), torque can be obtained. However, since the inductance of the first coil 111 changes not only with the torque but also with the temperature, the torsion bar 103
The temperature compensation is performed by detecting the inductance of the third coil 113, the inductance of which does not change due to the torsion.

The operation between the second and fourth movable magnetic cylinders 108 and 110 is exactly the same.
a, 110a, and the inductance of the second coil 112 changes. The torque is obtained by detecting the change in the inductance. Then, temperature compensation is performed by detecting the inductance of the fourth coil 114. Thus, the first and third movable magnetic cylinders 107 and 109 and the first and third coils 111 and 113
And the second and fourth movable magnetic cylinders 108 and 110 and the second and fourth movable magnetic cylinders 108 and 110, which can perform exactly the same measurement.
By doubling the second detection set constituted by the fourth coils 112 and 114, even if a failure such as disconnection occurs in one of the detection sets, the system can be operated by the other output. Yes, performing a double safety function.

[0006]

The conventional torque detecting device includes first to fourth movable magnetic cylinders 107 to 11 for changing the inductance of the first and second coils 111 and 112.
Separately from 0, the torsion bar 103 is required as an elastic member that generates deformation in proportion to the torque, and the number of parts is large and the configuration is complicated. Further, each tooth portion 107a-1 of each of the first through fourth movable magnetic cylinders 107-110.
Since 10a has a complicated shape, it is necessary to manufacture it by shaving, and the manufacturing is troublesome and the manufacturing cost is increased. Furthermore, in order to provide a temperature compensation function and also provide a double safety function against coil disconnection or the like at the same time, four coils are required in principle. In the conventional example, two sets of a pair of movable magnetic cylinders having teeth are required corresponding to the four coils.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a torque detecting device capable of detecting torque with a simple structure. It is another object of the present invention to provide a torque detection device having a temperature compensation function with a simple configuration. It is another object of the present invention to provide a torque detecting device having a simple configuration and multiple safety functions.

[0008]

According to a first aspect of the present invention, there is provided a torque detecting device comprising:
And a first axis and a second axis, which are fixed across the surfaces of the first axis and the second axis, and which are fixed by the relative rotation of the first axis and the second axis. A movable magnetic element including an element main body that is elastically deformed by a large displacement, a wing having soft magnetism supported by the element main body, and whose inclination in the axial direction is changed by the elastic deformation; a wing and a radial direction of the movable magnetic element And a coil disposed outside at a predetermined interval to magnetically detect the inclination of the wing.

According to a second aspect of the present invention, the coil is wound around the wing around the first axis and the second axis within the range of the axial length of the wing of the movable magnetic element. Are provided at a predetermined distance from each other in the axial direction, and a temperature difference is obtained by taking the difference between the outputs of the pair of coils.

According to a third aspect of the present invention, a plurality of sets of a pair of coils are provided.

In the torque detecting device according to a fourth aspect, a plurality of movable magnetic elements are arranged along a circumferential direction of the first axis and the second axis.

In the torque detecting device according to a fifth aspect, the plurality of movable magnetic elements have a wing mainly on the first shaft side.
A movable magnetic element, and a second movable magnetic element having a wing mainly on a second axis side, wherein at least one pair of the first movable magnetic element and the second movable magnetic element within an axial length of the wing. At least one pair of coils within the range of the axial length of the wing.

[0013] In the torque detecting device according to the sixth aspect, the element body and the wing are integrally formed of a sheet metal of a soft magnetic material.

In the torque detecting device according to the seventh aspect, the element main body and the wing are connected via the neck, and the neck is caulked.

In the torque detecting device according to the eighth aspect, the element body is formed of a high-strength material, and the wing is formed of a soft magnetic material separate from the element body.

In the torque detecting device according to the ninth aspect, the element body and the wing body are formed by integral sheet metal, and a soft magnetic material is fixed to the wing body to form the wing.

According to a tenth aspect of the present invention, the element main body is formed by bending a body extending in an axial direction and both ends of the body, and is fixed to the first and second shafts. The wing is provided in parallel with the trunk, extends in the axial direction, and is connected at the center of the trunk.

[0018] In the torque detecting device according to the eleventh aspect, the shape of the body is formed into a substantially trapezoidal shape tapering toward the wing.

According to a twelfth aspect of the present invention, the element main body has a rectangular long plate bent into a C-shape, and stay portions at both ends are fixed to the first axis and the second axis, respectively. Have been.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1A is a partial cross-sectional front view of a torque detecting device according to Embodiment 1 of the present invention, and FIG. In other words, the torque detecting device has a first
An upper shaft 1 serving as a shaft and a lower shaft 2 serving as a second shaft, and an upper shaft 1 which is fixed across the respective surfaces of the upper shaft 1 and the lower shaft 2 and is caused by relative rotation of the upper shaft 1 and the lower shaft 2. And a movable wing 4 having an element main body 3 elastically deformed by relative shear displacement of the surface of the lower shaft 2 and a wing 4 supported by the element main body 3 and having a soft magnetism to change an axial inclination by the elastic deformation. An element 5 and first to fourth coils 6a to 6d which are arranged at predetermined intervals in the radial direction with respect to the wing 4 of the movable magnetic element 5 and constitute coils for magnetically detecting the inclination of the wing 4; Have.
The element main body 3 of the movable magnetic element 5 itself has a function as an elastic member for generating a torsional deformation proportional to the torque between the upper shaft 1 and the lower shaft 2, and the torque can be detected only by the movable magnetic element 5. And the structure can be simplified.
Further, a conventional torsion bar is not required.

For example, a steering wheel is mounted on the upper shaft 1, and a pinion gear of a steering mechanism is mounted on the lower shaft 2, which are rotatably supported by bearings 7 and 8, respectively. FIG. 2 shows a partial cross-sectional view of a connection portion between the upper shaft 1 and the lower shaft 2. A protrusion 1a on the shaft end face of the upper shaft 1,
A concave portion 2a is provided on the shaft end surface of the lower shaft 2 so as to mesh with each other so that the lower shaft 2 cannot rotate more than one fixed angle (as shown in FIG. 1B, both sides of the convex portion 1a). Recess 2
A gap 60 is formed between at. ). In the center, a connection shaft 9 is inserted into a hole 61 provided in both the upper shaft 1 and the lower shaft 2, and the upper shaft 1 and the lower shaft 2 are
They do not bend too much. Upper shaft 1
At the connection between the shaft and the lower shaft 2, four planes 1f and 2f are provided at every 90 degrees around the shaft circumference.
A plurality of four movable magnetic elements 5, 5, 5, 5 are provided on f and 2f in the circumferential direction so as to straddle the upper shaft 1 and the lower shaft 2. The movable magnetic element 5 includes the element body 3 and the wing 4
Are manufactured by press working with a sheet metal of an integral soft magnetic material made of permalloy. By forming by press working in this way, the number of steps can be significantly reduced and the manufacturing cost can be significantly reduced as compared with the conventional example in which shaving is frequently used. In addition, for example,
The material of the movable magnetic element 5 may be silicon steel or iron.

The element body 3 includes a body 1 extending in the axial direction.
And a stay portion 1 which is formed by bending both ends of the body portion 10 and is fixed to the upper shaft 1 and the lower shaft 2.
And 1. The wing 4 is the trunk 1
0 and extend in the axial direction, and are connected via a neck 12 at the center of the body 10. The neck portion 12 is reinforced with a caulking 12a. The shape of the body 10 is formed in a substantially trapezoidal shape that tapers toward the wing 4.
2 is inclined in the axial direction. In addition,
The shorter the length of the upper side (thickness of the neck) of the trapezoidal trunk,
The inclination of the wing 4 in the axial direction is large. This is because, assuming that the amount of displacement of the stay 11 is constant, the shorter the thickness of the neck 12 is, the longer the arm between the center line of the neck 12, which is the center of the inclination of the wing 4, and the end of the neck 12. This is because the distance becomes shorter, and the inclination of the arm related to the inclination of the wing 4 increases accordingly.

FIG. 3 is a development view of the movable magnetic element 5. The stay portion 11 is configured by folding the bent piece portions 15 provided on the left and right sides of the body portion 10 to the back side of the paper along the dashed line of FIG. The bent piece portion 15 is provided with three projections 16 each, and the projections 16 are fixed to the respective flat portions 1f and 2f of the upper shaft 1 and the lower shaft 2 by projection welding.

The first to fourth coils 6a to 6d are wound around the respective shafts and arranged in the axial direction, and each coil 6a to 6d is provided between the respective coils 6a to 6d.
ring-shaped yokes 13a, 13a, 1b
3b, 13c, 13d, and 13e are interposed. Further, the first to fourth coils 6a to 6d and the yoke 13a
A cylindrical yoke 14 is provided so as to wrap around the outer periphery of 13e. The first to fourth coils 6a to 6a
d is wound around the wing 4 around the upper shaft 1 and the lower shaft 2 within the axial length of the wing 4 of the movable magnetic element 5. Then, one set of a coil pair of the first coil 6a and the third coil 6c separated by a predetermined distance in the axial direction, and one set of a coil pair composed of the second coil 6b and the fourth coil 6d are doubled. It is configured to detect torque.

FIG. 4 is a circuit block diagram of the torque detecting device according to the present invention. The first and third coils 6a and 6c are connected to an inductance comparison circuit 41a, and further connected to an amplification circuit 42a. The second and fourth coils 6b and 6d are connected to an inductance comparison circuit 41f, and further connected to an amplification circuit 42f.

Next, the operation will be described. When torque is applied to the upper shaft 1 by the steered wheels, a relative displacement in the rotational direction occurs on the shaft surface of the connection between the upper shaft 1 and the lower shaft 2. During this time, the movable magnetic element 5 acting as an elastic member
Are connected, the relative displacement is proportional to the applied torque. Since the inclination of the wing 4 of the movable magnetic element 5 changes due to its relative displacement, the magnitude of the applied torque can be obtained by magnetically detecting the inclination by the first to fourth coils 6a to 6d. . For example, when a rightward torque is applied to the upper shaft 1, in all four movable magnetic elements 6a to 6d, the torsion of the body 10 of the element body 3 causes
The right side of the wing 4 is lifted (radially outward), and the left side is lowered (radially inward). Then, as the right side, the yoke 13
Since the distance between d and 13e and the wing 4 becomes smaller, the inductance increases as the third and fourth coils 6c and 6d on the right side increase. On the other hand, the yokes 13a, 13
Since the distance between b and the wing 4 increases, the inductance decreases as the first and second coils 6a and 6b on the left. Therefore, if neither the temperature compensation function nor the dual safety function is provided, the torque can be obtained by measuring a change in the inductance of any one of the coils. However, actually, it is necessary to compensate the sensor output for the temperature change.
a, 6c, and the second and fourth coils 6b, 6d
And the inductance comparison circuits 41a and 41a
1f cancels the inductance change due to the temperature change of the coils 6a to 6d to perform the temperature compensation.

In this example, since the inductance of the third coil 6c becomes larger than the inductance of the first coil 6a due to the torque, these inductances are compared by the inductance comparison circuit 41a, and the difference is amplified by the amplification circuit 42a. By doing so, a temperature-compensated first output corresponding to the torque is obtained. The second and fourth coils 6b and 6d, the inductance comparison circuit 41f, and the amplification circuit 42f provide another system having the same function as described above.
A system is provided, and a second output according to the torque is obtained. Then, even if a failure such as disconnection occurs in one of the outputs, the other output can be used for backup.
Heavy safety functions are ensured. When an abnormally large torque is applied to the movable magnetic element 5, the movable magnetic element 5 is broken, so that the convex portion 1 a of the upper shaft 1 and the concave portion 2 a of the lower shaft 2
Are meshed with each other and cannot rotate more than one fixed angle, thereby preventing the movable magnetic element 5 from being broken.

Embodiment 2 FIG. 5 is a partial cross-sectional front view of a torque detector according to Embodiment 2 of the present invention. In the following description, only points different from the first embodiment will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted. In this embodiment, four movable magnetic elements are mainly composed of two first movable magnetic elements 51 having wings 41 on the upper shaft 1 side and two second movable magnetic elements having wings 42 mainly on the lower shaft 2 side. Magnetic element 52
And The second and fourth coils 6 are set within the range of the axial length of the wing 41 of the first movable magnetic element 51.
The first and third coils 6a and 6d are placed within the axial length of the wing 42 of the second movable magnetic element 52.
6c is provided. Here, the position of the second coil 6b and the position of the third coil 6c are replaced with those of the first embodiment.

In the first embodiment, the axial length of the wing 4 of the movable magnetic element 5 is set to the first to fourth coils 6a.
Since it has been expanded to cover all four of ~ 6d, it has a double safety function for disconnection of the coil. However, if a failure such as deformation occurs even with one movable magnetic element 5, the inductance of all coils appears, so that the movable magnetic element 5 does not have a double safety function. Therefore, the wing 41 of the first movable magnetic element 51 is provided only to the two coils 6b and 6d on the upper shaft 1 side.
Second movable magnetic element 52 having wing 42 on lower shaft 2 side
The wing 42 of FIG. 4 affects only the first and second coils 6a and 6c, and sets two independent detection sets.
By providing a set configuration, a double safety function is provided for the deformation of the movable magnetic element.

Embodiment 3 In the first and second embodiments, the movable magnetic element has a one-piece structure. However, a material having excellent magnetic performance generally has poor mechanical strength. Only the wing for which performance is required may be made of a soft magnetic material. Also, the wing may be formed by molding the element body and the wing body by integral sheet metal, and fixing a high-performance soft magnetic material such as an amorphous magnetic metal foil on the wing body. Further, similarly to the first embodiment, the element body and the wing may be formed by integral sheet metal, and a high-performance soft magnetic material may be fixed to the wing to further improve the magnetic characteristics as compared with the first embodiment. As a result, although the structure is slightly complicated, it is possible to achieve higher strength and higher accuracy. In the first and second embodiments, the function as the elastic member is given only to the movable magnetic element. However, if the strength is insufficient, a torsion bar may be provided. In the first and second embodiments, the inductance comparison circuit is used to detect the inclination of the wing in the axial direction. However, a magnetic transformer using a coil, such as a differential transformer method or a method of detecting reactance due to eddy current, is used. Any method may be used as long as it is appropriate.

Embodiment 4 FIG. FIG. 6 (a) is a partial cross-sectional front view of a torque detecting device according to Embodiment 4 of the present invention, and FIG. 6 (b) is a side central cross-sectional view. In this embodiment,
The element body 3 which is an elastic member is formed by bending a rectangular metal plate into a C shape. Attachment plates 20, 20 are respectively attached to the distal ends of the upper shaft 1 and the lower shaft 2. Each of the mounting plates 20, 20 is formed with four locking portions 20a. Locking part 2 of one mounting plate 20
0a, one stay portion 11 of the element body 3 is fixed, and the locking portion 20a of the other mounting plate 20 is attached to the element body 3
The other stay portion 11 is fixed. In this embodiment, the element main body 3 is formed by bending a rectangular metal plate into a C-shape, so that the shape is simple, the plate thickness can be increased, and a large torque can be detected. Becomes In addition, since the distance between the stays 11 can be increased, the movable range of the stay 11 increases accordingly, and even if a large torsional deformation is given between the upper shaft 1 and the lower shaft 2,
Excessive stress is less likely to be generated in the element body 3, and torque measurement with a wide dynamic range can be performed.

[0032]

As described above, according to the first aspect of the present invention, the first axis and the second axis to which a torque is applied between the first axis and the second axis, and the surfaces of the first axis and the second axis. An element body that is fixed across the body and elastically deforms with respect to a relative displacement of the surface between the first axis and the second axis caused by relative rotation between the first axis and the second axis; A movable magnetic element including a wing having soft magnetism whose inclination in the axial direction is changed by a coil, and a coil that is disposed at a predetermined interval radially outward from the wing of the movable magnetic element and that magnetically detects the inclination of the wing, , The element itself of the movable magnetic element has a function as an elastic member that generates torsional deformation in proportion to the torque between the first axis and the second axis, and the torque is detected by only one movable magnetic element. To simplify the structure It can be. Further, the conventional torsion bar becomes unnecessary, and the number of parts can be reduced.

According to the second aspect of the present invention, the first axis and the second axis are set within the range of the axial length of the wing of the movable magnetic element.
A pair of coils wound around the wing around the shaft are provided at a predetermined distance in the axial direction, and temperature difference is compensated for by taking the difference between the outputs of the pair of coils. By taking the difference, the effect of the temperature change can be eliminated, and it is not necessary to separately provide a coil for temperature compensation as in the related art.

According to the third aspect of the present invention, since a plurality of sets of a pair of coils are provided, even if one of the coils is disconnected, torque can be detected by the remaining set of coil pairs. Thus, multiple safety functions can be provided by one movable magnetic element.

According to the fourth aspect of the present invention, since a plurality of movable magnetic elements are arranged along the circumferential direction of the first axis and the second axis, detection sensitivity is increased.

According to the fifth aspect of the present invention, the plurality of movable magnetic elements include a first movable magnetic element having a wing mainly on the first shaft side and a second movable magnetic element having a wing mainly on the second shaft side. A movable magnetic element, and at least one pair of coils within a range of an axial length of a wing of the first movable magnetic element, and at least a pair of coils within a range of an axial length of a wing of the second movable magnetic element, respectively. Since one of the first and second movable magnetic elements is deformed, the torque can be detected by the other movable magnetic element and the pair of coils. It can have a safety function.

According to the sixth aspect of the present invention, the element body and the wing can be formed by press working since the whole of the element body and the wing are made of an integral sheet of soft magnetic material. , Can significantly reduce man-hours,
Manufacturing costs can be significantly reduced.

According to the invention of claim 7, the element body and the wing are connected via the neck, and the neck is caulked, so that the strength of the neck can be increased.

According to the eighth aspect of the present invention, the element body is formed of a high-strength material, and the wing is formed of a soft magnetic material separate from the element body. For the wing, a material having better magnetic properties can be used for the wing, and performance such as higher strength and higher accuracy can be improved.

According to the ninth aspect of the present invention, the element main body and the wing main body are formed by integral sheet metal and the wing is formed by fixing a soft magnetic material to the wing main body. High accuracy can be achieved.

According to the tenth aspect of the present invention, the element body is constituted by bending a body extending in the axial direction and both ends of the body, and is fixed to the first and second shafts. Since the wings are arranged in parallel with the body and extend in the axial direction and are connected at the center of the body, the formability is improved.

According to the eleventh aspect of the present invention, since the shape of the body is formed into a substantially trapezoidal shape tapering toward the wing, the force is concentrated on the connection with the wing, and the wing is formed. The displacement can be increased.

According to the twelfth aspect of the present invention, in the element body, the rectangular long plate is bent into a C-shape, and the stay portions at both ends are formed on the first axis and the second axis, respectively. Since it is fixed, the shape of the element body is simplified, the plate thickness can be increased, and a large torque can be detected. Further, torque measurement with a wide dynamic range can be performed.

[Brief description of the drawings]

FIGS. 1A and 1B show a torque detecting device according to a first embodiment of the present invention, wherein FIG. 1A is a partially sectional front view, and FIG.

FIG. 2 is a partial cross-sectional view showing a connection portion between a first shaft and a second shaft of the torque detection device according to the first embodiment of the present invention.

FIG. 3 is a development view of a movable magnetic element of the torque detection device according to the first embodiment of the present invention.

FIG. 4 is a circuit block diagram of the torque detection device according to the first embodiment of the present invention.

FIG. 5 is a partial cross-sectional front view of a torque detection device according to a second embodiment of the present invention.

6A and 6B show a torque detecting device according to a fourth embodiment of the present invention, in which FIG. 6A is a partial sectional front view, and FIG.

FIG. 7 is a partial sectional front view of a conventional torque detecting device.

[Explanation of symbols]

Reference Signs List 1 upper axis (first axis), 2 lower axis (second axis), 3 element body, 4 wings, 5 movable magnetic elements, 6a to 6
d, first to fourth coils, 10 trunk, 11 stay,
13a to 13e yokes, 14 yokes, 41, 42
First and second wings, 51, 52 First movable magnetic element.

Claims (12)

[Claims] A first shaft and a second shaft to which torque is applied between the first shaft and the second shaft; and a first shaft fixed to a surface of the first shaft and the second shaft.
An element body elastically deformed by a relative displacement between a first axis and a second axis surface caused by a relative rotation between the axis and the second axis, and an axial inclination changed by the elastic deformation supported by the element body A movable magnetic element including a wing having soft magnetism, and a coil disposed at a predetermined distance radially outward from the wing of the movable magnetic element and magnetically detecting the inclination of the wing. Detection device. 2. A coil wound around a wing around a first axis and a second axis within a range of an axial length of a wing of a movable magnetic element, and is separated by a predetermined distance in an axial direction. The torque detection device according to claim 1, wherein temperature compensation is performed by taking a difference between outputs of a pair of coils and a pair of coils. 3. The torque detecting device according to claim 2, comprising a plurality of sets of a pair of coils. 4. A plurality of movable magnetic elements are arranged along a circumferential direction of a first axis and a second axis.
3. The torque detecting device according to 1. 5. A movable magnetic element comprising: a first movable magnetic element having a wing mainly on a first axis side; and a second movable magnetic element having a wing mainly on a second axis side. The torque according to claim 4, wherein at least one pair of coils is provided within a range of an axial length of the wing of the first movable magnetic element, and at least a pair of coils are provided within a range of an axial length of the wing of the second movable magnetic element. Detection device. 6. The torque detecting device according to claim 1, wherein the element body and the wing are entirely formed of a sheet metal of a soft magnetic material. 7. The torque detecting device according to claim 1, wherein the element body and the wing are connected via a neck, and the neck is caulked. 8. The element body is formed of a high-strength material, and the wing is formed of a soft magnetic material separate from the element body.
6. The torque detecting device according to any one of claims 5 to 5. 9. The torque detecting device according to claim 1, wherein the element main body and the wing main body are formed by integral sheet metal and a wing is formed by fixing a soft magnetic material to the wing main body. 10. An element body includes a body extending in an axial direction,
The first is constituted by bending both ends of the body.
And a stay fixed to the second shaft portion, wherein the wing is arranged in parallel with the body portion, extends in the axial direction, and is connected at the center of the body portion. The torque detector according to any one of claims 1 to 3. 11. The torque detecting device according to claim 10, wherein the shape of the trunk portion is formed in a substantially trapezoidal shape tapering toward the wing. 12. The element body has a rectangular long plate bent into a C-shape, and stay portions at both ends are formed by a first member.
10. The torque detecting device according to claim 1, wherein the torque detecting device is fixed to the shaft and the second shaft.