JPH09311085A - Torque detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a torque detector whose structure is simplified and whose reliability is enhanced by installing a hollow cylindrical slider or the like which is moved along the shaft of a wheel hub by torque applied to a had rim hub. SOLUTION: When torque due to the operation of a user is applied to a hand rim 7, the torque is transmitted to a hand rim hub 7a so as to become torque which turns a rod-shaped protrusion part 17. Thereby, the hand rim hub 7a is turned slightly with reference to a wheel hub 13. At this time, a slider movement member 19 and a pin member 20 are installed at the hand rim hub 7a, and force in the shaft direction of the wheel hub 13 is generated as force which moves a slider 15 due to a rotation. Then, the force is transmitted directly to the slider 15, the slider 15 is moved, and a generated torque value is detected by a position sensor 25 which is coupled to the slider 15. As a result, the structure of a torque detection apparatus is simplified, a complicate electric circuit or the like is not required, so that the apparatus is simplified as a whole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque detecting device, and more particularly to a torque detecting device mounted on an electric wheelchair or the like and used for controlling an auxiliary driving force.

[0002]

2. Description of the Related Art Conventionally, there have been the following types of torque detection devices used in electric wheelchairs and the like. That is, JP-A-3-15468 and JP-A-6-304.
According to Japanese Patent Publication No. 205, as shown in FIG. 12, an operating torque generated when a user operates the hand rim 100 is measured by mounting a strain gauge 101 between the wheel 102 and the hand rim 100, An invention of a system in which a current according to the operation torque is supplied to a drive motor to generate an auxiliary drive force is disclosed.

Further, as another example, a so-called load cell is used, and as a special example, an encoder is used to elastically engage a hand rim and a wheel with each other and to generate a difference in rotational angle between the hand rim and a wheel. Etc. to detect the torque generated from this difference (Japanese Patent Laid-Open No. 7-
Japanese Patent Laid-Open No. 136218) and the like are also proposed.

Further, as a concrete method of generating the auxiliary driving force, a driving signal for assisting is not generated until a predetermined operation torque value, and when the torque exceeds a predetermined value, the operation torque is immediately responded to. A system has been proposed in which a torque drive signal is linearly generated to supply a motor current (Japanese Patent Laid-Open No. 3-15468).

[0005]

However, the above conventional example has the following disadvantages. That is, there is a problem that the structure becomes complicated in the torque detecting device of the type using the strain gauge, the load cell, the encoder and the like. In particular, in the above-mentioned conventional example, since the sensors such as the strain gauge rotate integrally with the wheels, the harnesses for current supply and detection signal transmission connected to the respective sensors are entangled with the wheels. Problems are likely to occur.

Further, in order to prevent the above-mentioned entanglement phenomenon of the harness, it is necessary to arrange a complicated harness, resulting in an increase in manufacturing cost.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the disadvantages of the conventional example, and in particular to provide a torque detecting device which is structurally simple and highly reliable.

[0008]

In order to achieve the above-mentioned object, according to the invention of claim 1, a wheel hub for supporting a wheel and a wheel hub positioned concentrically with the wheel hub and capable of rotating relative to each other. A hand rim hub and a hollow cylindrical slider that can move along the axis of rotation of the wheel hub are provided, through-holes are formed in the wall surface of the slider, and a rod-shaped slider moving member is formed on the wheel hub side surface of the hand rim hub. And a rod-shaped protrusion, and a through-hole for the moving member and a long-hole through-hole are formed at predetermined positions of the wheel hub corresponding to the slider moving member and the rod-shaped protrusion, and the slider is provided in the central region of the wheel hub. A rail-shaped slider support member for supporting the.

Then, a predetermined pin member is projected on the outer peripheral portion of the slider moving member, and this pin member is engaged with a position corresponding to the slanted through hole of the slider, so that the rod-shaped projection penetrates the elongated hole of the wheel hub. The structure is such that it is sandwiched by two through-hole spring members arranged in the holes, and a position sensor for detecting the position of the slider is installed near the slider.

With the above-described structure, first, a torque is applied to the hand rim by a user's operation. Then, this torque is transmitted to the hand rim hub and becomes a torque for turning the rod-shaped protrusion. This causes the hand rim hub to rotate slightly with respect to the wheel hub. At this time, the hand rim hub is provided with a slider moving member and a pin member, and a force is generated in the rotational axis direction of the wheel hub as a force for moving the slider with rotation. Then, this force is directly transmitted to the slider, the slider moves, and the torque value generated by the position sensor engaged with the slider is detected.

On the other hand, the torque detecting device of the present invention can detect the torque in the same manner even when the torque is applied in the opposite direction. That is, when torque in the opposite direction is applied, the hand rim hub rotates in the opposite direction with respect to the wheel hub, and the slider moving member also rotates in the opposite direction. As a result, the slider also moves in the opposite direction, and this movement is detected as a torque value by the position sensor.

Further, in the invention described in claim 2, a predetermined bearing is provided between the pin member of the slider moving member and the slanted through hole of the slider, and the other structure is set forth in claim 1. It is similar to the invention. With the above-described structure, even if the slider moving member rotates and the pin member presses the through-slanted hole of the slider, they make rolling contact with each other and the slider can move smoothly.

According to a third aspect of the present invention, the position sensor is brought into contact with the slider, and a predetermined bearing is provided at a position where the position sensor is brought into contact with the slider. This is the same as the invention described in 2. With the above configuration, even if the slider or the like is rotating, the contact with the position sensor is rolling contact with the bearing. Therefore, the contact of the position sensor does not resist the rotation of the slider.

[0014]

An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 shows a front view of the torque detection device, and is shown as a partially cutaway sectional view for convenience of description.

The torque detecting device 1 includes a wheel hub 13 that supports the wheels 5, a hand rim hub 7a that is positioned concentrically with the wheel hub 13 and that can rotate relative to the wheel hub 13, and along the rotational axis direction of the wheel hub 13. A slider 15 having a hollow cylindrical shape that can be moved. And a through hole 21a for the moving member and a through hole 21 for the moving member are formed at predetermined positions of the wheel hub 13 corresponding to the slider moving member 19 and the rod-shaped projections 17, and further in the central region of the wheel hub 13. A rail-shaped slider support member 16 that supports the slider 15 is provided.

A predetermined pin member 20 is provided on the outer peripheral portion of the slider moving member 19, and the pin member 20 is provided.
Is engaged with a position corresponding to the through-slanted hole 15a of the slider 15, and the rod-shaped protrusion 17 is sandwiched by two through-hole spring members 23 (see FIG. 3) arranged in the long hole through-hole 21 of the wheel hub 13. The position sensor 2 for detecting the position of the slider 15
5 is mounted near the slider 15.

Explaining the above in detail, FIG. 2 is a diagram showing a state before the torque detection device 1 is assembled. As shown in FIG. 2, the hand rim hub 7a is formed in a disk shape, and the hand rim 7 is mounted on the outer peripheral portion thereof. As shown in FIG. 7, the diameter of the hand rim 7 is smaller than the diameter of the wheel 5 so that the hand rim 7 does not come into contact with the road surface during traveling. Further, an axle hole through which a predetermined axle penetrates is formed at the center of the hand rim hub 7a.

A predetermined rod-shaped protrusion 17 is formed on the surface of the hand rim hub 7a on the wheel hub 13 side. The rod-shaped protrusion 17 is inserted into a long hole through hole 21 of the wheel hub 13 described later, and is for transmitting the torque applied to the hand rim 7 to the wheel hub 13. The two bar-shaped protrusions 17 are provided symmetrically with respect to the center of the hand rim hub 7a. Here, in the present embodiment, the rod-shaped protrusion 17 is formed in a cylindrical shape, but the present invention is not limited to this, and may be, for example, a prismatic member or a plate-shaped member. Is also good. in addition,
The rod-shaped protrusion 17 may be integrally formed with the hand rim hub 7a, or may be separately formed and joined later.

Further, on the surface of the hand rim hub 7a, a predetermined slider moving member 19 is provided so as to project together with the above-mentioned rod-shaped projection portion 17. Particularly, in the present embodiment, the cylindrical slider moving member 19 is provided at the center of the hand rim hub 7a. This slider moving member 19
Depending on the torque applied to the hand rim 7, the slider 15
Is to move. Further, at a predetermined position on the outer peripheral portion of the slider moving member 19, a pin member 20 engaged with the through oblique hole 15a of the slider 15 is provided in a protruding manner.
In this pin member 20, the hand rim hub 7 a is the wheel hub 1.
3 when rotating with respect to
This is for moving the slider 15 by directly engaging with 5a. In the present embodiment, the pin member 20 includes
A predetermined bearing is arranged at the contact portion with the through oblique hole 15a to reduce the contact resistance between them.

The above-mentioned predetermined wheel hub 13 is arranged near the hand rim hub 7a. This wheel hub 13
Is for rotating the wheels by receiving torque transmission from the hand rim hub 7a. Although wheels are omitted in FIG. 2 for convenience of description, actually, an aluminum wheel 29 having the shape shown in FIG. 1 is fixed to the wheel hub 13 with bolts.

Further, the wheel hub 13 is formed with two elongated hole through holes 21. The elongated hole through holes 21 are provided at two locations symmetrically with respect to the center of the wheel hub 13.
Then, the rod-shaped protrusion 17 of the hand rim hub 7a described above.
Is to be inserted. Further, a moving member through hole 21a into which the above-mentioned slider moving member 19 is inserted is also formed in the center of the wheel hub 13. That is, the long hole through-hole 21 and the moving member through-hole 21a are formed at positions corresponding to the rod-shaped protrusion 17 and the slider moving member 19 provided on the hand rim hub 7a. Here, as the size of the elongated hole through hole 21, a sufficient width and length are ensured so that the hand rim hub 7a can relatively rotate after the hand rim hub 7a is engaged with the wheel hub 13.

Further, as shown in FIG. 2, on the surface of the wheel hub 13, the wheel hub 1 is sandwiched with a moving member through hole 21a interposed therebetween.
The slider support member 1 on the rail along the rotation axis direction of 3
Two 6 are provided. This slider support member 16
Has a function of allowing the slider 15 to move along the rotation axis of the wheel hub 13 and a function of suppressing relative rotation of the slider 15 with respect to the wheel hub 13.

The slider 15 has a hollow cylindrical shape, and a predetermined slider groove 15b is formed in the generatrix direction at a position corresponding to the slider supporting member 16 described above. Then, the slider 15 is loosely inserted and supported by the slider support member 16 described above via the slider groove 15b. Therefore, the slider 15 is configured to be movable along the slider support member 16 in the rotation axis direction of the wheel hub 13.

A predetermined slider spring 16a is arranged between the slider 15 and the wheel hub 13. The slider spring 16a is for always applying a predetermined elastic force to the slider 15 so that the position of the slider 15 can be accurately specified with respect to the rotation of the slider moving member 19.

Next, FIG. 3 is a view showing a state in which the hand rim hub 7a is mounted on the wheel hub 13, and particularly, a view seen from the wheel hub 13 side. However, in this figure, the slider 15 is omitted for convenience of description. As is apparent from FIG. 3, the bar-shaped protrusion 17 of the hand rim hub 7a is
Is located at the center of the elongated hole through hole 21 of the wheel hub 13 and is sandwiched by the through hole spring members 23 from both sides. Since each through-hole spring member 23 has the same spring constant, even if an external force (torque) is once applied to the bar-shaped protrusion 17 via the hand rim hub 7a, when this external force is lost thereafter, Specifically, the rod-shaped protrusion 17 is adapted to return to the central portion of the elongated hole through hole 21. Here, the long hole through-hole 21 and the rod-shaped protrusion 17 are 2
Although a set is provided, the present invention is not limited to this, and may be one set or three or more sets.

In addition to the above, the torque detection device 1 is provided with a position sensor 25 in contact with the slider 15 as shown in FIG. The position sensor 25 is for detecting the amount of movement of the slider 15 and converting this to the applied torque. Specifically, as shown in FIG.
A main body of the position sensor 25 is installed on the support disk 27, and a predetermined bearing 25a is provided at a contact portion with the slider 15. That is, when the slider 15 moves (left and right in the figure), the position sensor 25 detects this movement. However, the position sensor 25 is not limited to those of the contact type, and for example, the slider 1
An optical type in which the end surface of 5 is irradiated with laser light and the reflected light is detected may be used.

A specific torque detecting mechanism of the torque detecting device 1 having the above-mentioned main components will be described with reference to FIG. Here, in the description of the detection of the torque, it will be referred to as torque, torque, torque ... In the torque transmission at each stage for convenience.

First, the hand rim hub 7a and the wheel hub 1
When 3 starts rotating, the slider 15 also starts rotating together with them. At this time, the slider 15 is stopped at the steady position in the state where no torque is applied to the hand rim hub 7a (see FIG. 1). On the other hand, as shown in FIG. 2, when a torque is applied to the hand rim 7, a rotation angle difference occurs between the hand rim hub 7a and the wheel hub 13 according to the magnitude of the torque. And hand rim hub 7
The torque is transmitted to the rod-shaped protrusion 17 of a. This torque is applied to the through hole spring member 23 arranged in the long hole through hole 21.
Is transmitted to the wheel hub 13 and becomes a torque for rotating the wheel hub 13.
Here, by appropriately changing the spring constant of the through-hole spring member 23, it is possible to change the response to torque.

At the same time, since the slider moving member 19 itself also rotates integrally with the hand rim hub 7a, the rotation is transmitted to the pin member 20 as torque. This torque presses the through oblique hole 15a of the slider 15 as torque. At this time, the slider 15 moves toward the slider support member 16
Due to this, rotation with respect to the wheel hub 13 is suppressed.
Therefore, the torque applied to the slider 15 via the through oblique hole 15a acts to move the slider 15 itself in the torque direction. Needless to say, the amount of movement of the slider 15 at this time is proportional to the amount of torque applied to the hand rim 7.

Therefore, the applied torque can be calculated by detecting the amount of movement of the slider 15 by the position sensor 25. At this time, slider 1
Although 5 is rotating integrally with the wheel hub 13 and the like, the position sensor 25 is fixed to the support disk 27. However, since the bearing 25a is disposed at the contact portion with the slider 15 as described above, the sliding resistance does not occur even when they are in contact with each other, and the position of the slider 15 can be smoothly detected. Can be detected.

When torque is detected by the torque detection device 1 according to the present embodiment, as an application example, the drive motor is driven from the value of the torque to apply the auxiliary drive force to the wheels 5. There is. Specifically, it is applied to the electric wheelchair 1 (see FIG. 7). Therefore, as shown in FIG. 1, the support disk 27 is equipped with a drive motor 31. A motor gear 33 is engaged with the drive motor 31, and the motor gear 33 meshes with a rack 34 formed on the inner peripheral wall of the wheel 29.

Next, another embodiment of the present invention will be described. Here, the same components as those in the first embodiment will be described using the same reference numerals.

In this embodiment, as shown in FIG. 4, the basic components are common to those of the first embodiment. However, in the present embodiment, as shown in FIG. 5, a rail-shaped slider support member 66 is projectingly provided at the center of the wheel hub 63. This slider support member 6
As shown in FIG. 6, the cross-sectional shape of 6 is a shape obtained by cutting out a part of a circle, and more specifically, a shape in which two fan shapes are integrally joined. However, the shape of the slider support member 66 is not limited to this, and may be a plate shape as long as it can support the slider 65.

A predetermined boss 66a is formed on the outermost peripheral portion of the slider support member 66. The boss 66a is for preventing the slider 65 from rotating with respect to the wheel hub 63. In addition, a circlip groove 66c in which a circlip for fixing the slider spring 66b is arranged is formed near the tip of the slider support member 66 (see FIG. 5).

Further, the wheel hub 63 is provided on both sides with the slider support member 66 sandwiched therebetween, on both sides of the moving member through hole 63.
a is formed at two places. This moving member through hole 63
A has a sufficient length and width so that a slider moving member 69, which will be described later, can move smoothly.

The slider moving member 69 projecting from the hand rim hub 7a has a through hole 63 for the moving member.
The slider support member 6 is positioned in the area corresponding to a.
It is located so as to sandwich 6 from both sides. Specifically, as shown in FIG. 6, the cross-sectional shape is formed into a substantially fan shape, and two pieces are provided symmetrically with respect to the center of the slider support member 66. That is, the slider supporting member 66 and the slider moving member 69 form a substantially circular cross section. Further, a predetermined gap is formed between the slider supporting member 66 and the slider moving member 69, and even when torque is applied to the hand rim hub 7a, the slider moving member 6 is moved with respect to the slider supporting member 66.
9 can be moved.

A predetermined pin member 20 is arranged on the outer peripheral surface of the slider moving member 69. This pin member 20 is also provided with bearings as in the first embodiment, and functions similarly.

The slider 65 supported by the slider support member 66 is formed in a hollow cylindrical shape, and a predetermined slider groove 65b is formed on the inner peripheral wall surface thereof.
More specifically, the slider support member 66 is linearly formed at a position corresponding to the boss 66a. That is, as shown in FIG. 6, when the slider 65 is fitted into the slider support member 66, the slider groove 65b and the boss 66a are removed.
Are engaged with each other, whereby rotation of the slider 65 with respect to the wheel hub 63 is suppressed.

After the slider 65 is supported by the slider support member 66, a slider spring 66b is disposed in contact with the slider 65 and fixed by a circlip.

FIG. 7 is a diagram showing an electric wheelchair to which the torque detection device 1 according to the present invention is applied. This electric wheelchair is basically composed of a wheelchair body composed of a frame 3 and a seat surface 4, wheels 5 for running the electric wheelchair, and a hand rim 7 to which a user applies a driving force. Further, based on the torque detection device 1 described above, a main control unit that outputs a control current according to the information of the torque detection device 1, and a control current of the main control unit in the central region of the wheel 5. It is equipped with a drive motor that applies auxiliary drive force to the wheels.

Next, the control of the electric wheelchair according to this embodiment will be described. First, FIG. 8 is a diagram showing a control block of the electric wheelchair. In the electric wheelchair, a torque detection device 1 capable of detecting torque is provided on both the left and right hand rims 7. Then, the torque detection device 1
The information on the torque detected at is transmitted to the left and right main control units 41, respectively. The main control section 41 is connected to a reference current selecting means 9 for changing the ratio of the auxiliary driving force to the torque. Further, a vehicle speed sensor 43 is connected to the main controller 41.

A battery 45 for generating an auxiliary drive force and a drive motor 31 are connected to the main control unit 41, and an appropriate auxiliary drive force is generated in accordance with the detection value of the torque detection device 1 described above. It is supposed to occur. Specifically, the main control unit 41 supplies a necessary control current to the drive motor 31 according to the detected torque value to assist the movement of the electric wheelchair. At this time, the main control unit 41 detects the vehicle speed by the vehicle speed sensor 43, limits the maximum speed of the electric wheelchair, and controls the safe speed.

Next, the relationship between the torque and the control current supplied to the drive motor 31 will be described with reference to the drawings. For example,
Assume that a torque having a shape as shown in FIG. 9A is detected. The main controller 41 supplies the control current to the drive motor 31 according to the torque value by the current control function, but does not supply the control current to the drive motor 31 when the torque value is smaller than the predetermined value n. This is what is called a dead zone. If the drive motor is rotated with a small torque, the power consumption of the battery is accelerated, and this is a measure for preventing such a situation.

On the other hand, when the detected torque exceeds the predetermined value n, the main controller 41 supplies a predetermined initial current to the drive motor 31, as shown in FIG. 9B. This initial current is fixed to 5 [A] in the present embodiment, and this value is constant irrespective of the input torque value. After that, the current is gradually increased to a reference current value corresponding to the input torque. By controlling in this way, the user can recognize the generation of the auxiliary driving force by the initial current of 5 [A], and thereafter the control current gradually increases, so that a comfortable assist feeling can be obtained. You can

Next, FIG. 10 shows a control map of the reference current value of the control current with respect to the torque. Then, these reference current values can be selected by the reference current selecting means 9 provided in the electric wheelchair. For example, assume that the reference current selection unit 9 selects the reference current value (a) in FIG. In this case, the initial current is constant, but the control current as the reference current value is not set so large even when a large torque is input. Therefore, even when the user applies a large torque to the hand rim, the auxiliary driving force is small. Therefore, it is considered that such a reference current value (a) is suitable for a person who has sufficient physical strength and a person who is unfamiliar with the operation of the electric wheelchair.

On the other hand, the reference current selecting means 9 shown in FIG.
Assume that the reference current value (d) in the middle is selected. Also in this case, the initial current is constant, but this reference current value (d)
In FIG. 10, as shown in FIG. 10, the gradient of the reference current value with respect to the torque is large. That is, as compared with the reference current value (a), a large reference current value is set even for a small torque. Therefore, when the user applies a torque to the hand rim, a large auxiliary driving force is generated.
Therefore, it is considered that such a reference current value (d) is suitable for a user without physical strength.

Next, FIG. 11 is a diagram of another control example. This control is realized by the current increase rate selection function of the main control unit 41. Specifically, the diagram in the figure shows the rate of increase of the control current from the initial current supplied to the drive motor to the reference current value when the torque is applied, with respect to time. For example, the reference current value is 2
Considering the control in the case of 0 [A], (a) in FIG. 11 shows 50 [A] after the initial current of 5 [A] is supplied.
The control current is increased to 20 [A] at 0 [ms]. This can be regarded as an increase rate of the auxiliary driving force generated by the driving motor. Therefore. In the case of (a), it means that the electric wheelchair can obtain a relatively large acceleration.

On the other hand, (c) in FIG. 11 shows an initial current of 5
After supplying [A], 20 minutes at 1500 [ms].
The control current is increased up to [A]. This means that a small acceleration can be obtained, contrary to the case (a) described above. If the reference current selection means 9 can adjust the rate of increase of the control current, the auxiliary drive force can be controlled appropriately according to the characteristics of the user.

[0049]

The present invention is constructed and functions as described above. Particularly, in the invention described in claim 1, the torque is detected by the slider 15 having the through oblique hole 15a and the slider support member 16 having the pin member 20. Therefore, there is an excellent effect that the structure is simple, and a complicated electric circuit or the like, which has been a problem when using a conventional strain gauge or the like, is unnecessary and the entire device is simplified. Since the hand rim hub is elastically engaged with the wheel hub, there is an excellent effect that the torque applied to the hand rim 7 can be similarly detected in both forward and reverse rotation directions.

According to the second aspect of the present invention, since the pin member 20 is equipped with a bearing, when the torque is applied to the hand rim hub 7a, the torque is smoothly transmitted to the slider 15 and the slider 15 is moved to the wheel hub. The excellent effect that it can be smoothly moved along the rotation axis of 13 is produced.

Further, according to the third aspect of the invention, a predetermined bearing is provided at the abutting portion of the position sensor which abuts on the end surface of the slider 15. Therefore, it does not become a resistance against the rotating slider, the movement of the slider can be detected smoothly, and as a result, the reliability of torque detection is improved, which is an excellent effect.

[0052]

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a torque detection device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the torque detection device disclosed in FIG.

FIG. 3 is a side view seen from the rear wheel hub side after the torque detection device disclosed in FIG. 2 is assembled.

FIG. 4 is a partially cutaway front view showing a torque detection device according to another embodiment of the present invention.

5 is an exploded perspective view showing the torque detection device disclosed in FIG. 4. FIG.

6 is a side view showing the relationship between the slider, the slider support member, and the slider moving member of the torque detection device disclosed in FIG.

FIG. 7 is a diagram showing an electric wheelchair to which the torque detection device of the present invention is applied.

FIG. 8 is a diagram showing a control block to which the torque detection device of the present invention is applied.

9 is a diagram showing a relationship between torque and control current by the control block disclosed in FIG. 8, FIG. 9 (A) showing a relationship between torque and time, and FIG. 9 (B) showing a control current and time. The relationship of each is shown.

10 is a diagram showing a control map of control current with respect to torque by the control block disclosed in FIG. 8;

FIG. 11 is a diagram showing another control map of the present invention, and is a diagram showing a case where the time to reach a reference current value is changed.

FIG. 12 is a diagram showing a conventional torque detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque detection device 3 Frame 5 Wheel 7 Hand rim 7a Hand rim hub 13 Wheel hub 15 Slider 15a Through oblique hole 16 Slider support member 17 Rod-like protrusion 19 Slider moving member 20 Pin member 21 Long hole Through hole 21a Through hole for moving member 23 Through Hole spring member 25 Position sensor 25a Bearing

Claims (3)

[Claims] 1. A wheel hub supporting a wheel, a hand rim hub positioned concentrically with the wheel hub and capable of relative rotation, and a hollow cylindrical slider movable along a rotation axis of the wheel hub. A through-slanted hole is formed in the wall surface of the slider, and a rod-shaped slider moving member and a rod-shaped projection are planted on the surface of the hand rim hub on the wheel hub side. A through hole for a moving member and an elongated hole through hole are formed at a predetermined position of the wheel hub corresponding to a section, and a rail-shaped slider support member for supporting the slider is provided in a central region of the wheel hub, A predetermined pin member is projectingly provided on the moving member, and the pin member is engaged with a position corresponding to the through-slanted hole of the slider, and the rod-shaped protrusion is formed into the long hole of the wheel hub. Sandwiched by two through holes spring member disposed through holes, torque detection device a position sensor for detecting the position of the slider was characterized by equipping the vicinity of the slider. 2. The torque detecting device according to claim 1, wherein a predetermined bearing is provided between the pin member of the slider moving member and the through oblique hole of the slider. 3. The position sensor is brought into contact with the slider, and a predetermined bearing is provided at a position where the position sensor comes into contact with the slider.
Alternatively, the torque detection device described in 2.