JPH11337305A - Device for detecting angle of rotation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability and reliability at the time of assembly by rotatably supporting the projected end side of a rotational shaft with the sensor body of an angle of rotation sensor. SOLUTION: A valve shaft 25 is provided through a bearing 26 at the bearing housing parts 23 and 24 of a throttle body 21 so as to be rotatable, and the valve shaft 25 is positioned in a throttle chamber 22, and provided with a valve plate 27. Also, a wire drum 28 and a return spring 30 or the like are provided at one projected end 25A of the valve shaft 25, and a throttle sensor 33 is provided at the other projected edge 25B side. Then, a throttle body 34 of the throttle sensor 33 is provided with a sleeve bearing 41, and the projected end 25B side of the valve shaft 25 is supported by the sleeve bearing 41 so as to be rotatable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle detecting device which is suitably used as a throttle valve device for an automobile engine or the like, and an accelerator operation amount detecting device. The present invention relates to a rotation angle detecting device having such a configuration.

[0002]

2. Description of the Related Art Generally, a rotation angle detecting device is used as, for example, a throttle valve device of an automobile engine. The throttle valve device is configured to detect an opening degree of a valve body that opens and closes an intake passage of the engine as a rotation angle of a valve shaft by a throttle sensor.

A conventional throttle valve device of this type will be described with reference to FIGS.

[0004] Reference numeral 1 denotes a throttle body as a casing formed by means such as aluminum die casting. The throttle body 1 is an intake passage (not shown) of an engine.
A throttle chamber 2 connected to the middle of the throttle chamber 2 is disposed on both sides in the radial direction opposed to each other with the throttle chamber 2 interposed therebetween, and substantially protrudes outward from the throttle chamber 2 to both left and right sides in FIG. It is composed of cylindrical bearing accommodating portions 3, 4 and the like. A sensor mounting portion 4A is formed on the distal end side of the bearing housing portion 4, and a sensor housing chamber 4B is formed inside the sensor mounting portion 4A.

[0005] 5 is a bearing accommodating portion 3 of the throttle body 1
4 is a valve shaft as a rotation shaft rotatably provided by using each bearing 6. The valve shaft 5 extends in the radial direction in the throttle chamber 2, and one end in the axial direction is outside the bearing housing 3. 5A. As shown in FIG. 6, the other end of the valve shaft 5 is a small-diameter protruding end 5B protruding from the bearing accommodating portion 4 to the throttle sensor 12 described later.
The tip side is a conical pointed tip 5C.

Reference numeral 7 denotes a valve plate as a valve body fixed to the valve shaft 5. The valve plate 7 is formed of a circular metal plate or the like as shown in FIG. The valve plate 7 opens and closes the intake passage of the engine by being rotated together with the valve shaft 5 to adjust the intake air amount of the engine.

Reference numeral 8 denotes a wire drum provided on the protruding end 5A side of the valve shaft 5. The wire drum 8 is provided with a retainer plate 9 for restricting the opening of the valve plate 7 within a predetermined range.
Is fixed in a detented state. An arc-shaped drum portion 8A extending in the rotation direction of the valve shaft 5 is provided on the outer peripheral side of the wire drum 8, and a wire (neither is shown) connected to the accelerator portion of the vehicle is provided on the drum portion 8A. Etc. are wound.

Reference numeral 10 denotes a return spring mounted on the outer peripheral side of the protruding end 5A of the valve shaft 5 via a cylindrical holder 11. The return spring 10 is connected to the throttle body 1 side and the retainer plate 9
And urges the valve shaft 5 in the valve closing direction of the valve plate 7.

Reference numeral 12 denotes a throttle sensor as a rotation angle sensor provided between the throttle body 1 and the protruding end 5B of the valve shaft 5. The throttle sensor 12 is made of a resin material or the like as shown in FIG. Substantially disk-shaped sensor body 13
And a substantially arc-shaped resistor 1 provided on the inner surface side of the sensor body 13 via the substrate 14 and extending in the rotation direction of the valve shaft 5.
5 and 15 and sliding brushes 17 and 17 fixed to the protruding end 5B of the valve shaft 5 via a brush holder 16 and rotated by the valve shaft 5 in a state of slidingly contacting with each resistor 15. Thus, a potentiometer is configured.

The sensor body 13 has a through hole 13A covered with a cap 18 and a plurality of screws which are arranged at intervals on the outer peripheral side of the sensor body 13 and through which mounting screws 19 are inserted with a gap. The sensor body 1 surrounds the insertion hole 13B (only one is shown) and the through hole 13A.
3 and a ring-shaped recess 13C formed on the outer surface side. Further, the sensor body 13 is provided with each mounting screw 1.
9 and the like, attached to the sensor attachment portion 4A of the throttle body 1 to close the sensor accommodation chamber 4B,
In this state, the pointed end 5C of the valve shaft 5 is inserted into the through hole 13A with a gap.

The throttle sensor 12 is connected to the valve shaft 5.
Is detected as a change in resistance between the resistor 15 and the sliding brush 17, and a detection signal corresponding to the opening of the valve plate 7 is transmitted from a connector provided on the sensor body 13 to control for engine control. These are output to a unit (neither is shown) or the like.

In the conventional throttle valve device constructed as described above, when the driver depresses the accelerator pedal, the wire drum 8 is pulled through the wire, so that the valve shaft 5 and the valve plate 7 are returned together with the return spring. The valve plate 7 opens and closes according to the operation amount of the accelerator pedal. Then, the control unit performs engine control using a detection signal or the like output from the throttle sensor 12.

Further, when assembling the throttle sensor 12, as shown in FIG.
And abuts the sensor mounting portion 4A of the throttle body 1 with the sensor body 13 aligned with the jig 20.

The positioning jig 20 has a shaft portion 20A, an engaging hole 20B, each engaging portion 20C, and the like. When the sensor body 13 abuts against the throttle body 1, the jig is used. 20 is inserted into the through hole 13A of the sensor body 13 and the engagement hole 20B at the tip end thereof is inserted into the valve shaft 5A.
And the engaging portions 20C are engaged with the concave portions 13C of the sensor body 13.

Thus, the sliding brush 17 provided on the valve shaft 5 side and the resistor 1 provided on the sensor body 13 side
5 comes into sliding contact with each other in a state of being aligned with the radial direction of the valve shaft 5. Therefore, the sensor body 13 is fixed to the throttle body 1 by using the mounting screws 19 while maintaining this alignment state. Then, the jig 20 is removed from the throttle sensor 12, and the sensor body 1 is removed.
The assembling operation of the throttle sensor 12 is completed by covering the third through hole 13A with the cap 18.

[0016]

In the prior art described above, the throttle sensor 12 is provided between the throttle body 1 and the valve shaft 5, and even when the valve shaft 5 is at an arbitrary rotation position, the throttle sensor 12 projects. Sliding brush 1 fixed to end 5B side
7 is brought into sliding contact with a substantially arc-shaped resistor 15 fixed to the throttle body 1 side.

Therefore, when assembling the throttle sensor 12, the sensor body 13 is aligned with respect to the radial direction of the valve shaft 5 by attaching and detaching the positioning jig 20 and the like to and from the sensor body 13. Therefore, there is a problem that the fixing work requires time and effort.

Further, if the resistor 15 is displaced in the radial direction with respect to the sliding brush 17 due to, for example, a dimensional error of the jig 20 or the like, these contact states may become unstable.
Unless the jig 20 is formed with high accuracy, the detection accuracy of the throttle sensor 12 may be reduced.

Further, since the protruding end 5B of the valve shaft 5 is a free end protruding from the bearing 6 toward the throttle sensor 12, vibration from an engine or the like is easily transmitted to the protruding end 5B. For this reason, even when the protruding end 5B of the valve shaft 5 is displaced in the radial direction due to vibration or the like, the contact state between the resistor 15 and the sliding brush 17 may become unstable, thereby improving reliability. There is a problem that is difficult.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention allows a rotation angle sensor to be efficiently assembled to a casing, and the rotation angle sensor is positioned radially at the time of assembly. It is an object of the present invention to provide a rotation angle detection device that can reliably prevent displacement and a radial displacement of a protruding end side of a rotation shaft due to vibration or the like and improve reliability. .

[0021]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a casing having bearing housings on both left and right sides, and a casing provided in each bearing accommodation of the casing. A bearing, a rotating shaft rotatably provided on the casing by using the bearings, and a shaft end serving as a protruding end protruding outside the casing via the bearing; and a protruding end of the rotating shaft. A rotation angle sensor that is provided on the casing and is provided at the side and that detects a rotation angle of the rotation shaft and outputs a detection signal. A sensor-side bearing for rotatably supporting the protruding end of the rotating shaft is provided.

With this configuration, the protruding end of the rotation shaft can be rotatably supported by the sensor-side bearing of the rotation angle sensor, and vibration on the protruding end can be prevented. When the rotation angle sensor is mounted on the casing, the rotation angle sensor can be positioned in the radial direction of the rotation shaft by inserting the protruding end of the rotation shaft into the sensor-side bearing. .

Further, in the invention of claim 2, the rotation angle sensor is fixed to the casing at a position where an outer peripheral side surrounds a protruding end side of the rotating shaft, and the sensor-side bearing is provided on an inner peripheral side. A sensor body provided on the sensor body facing the casing and extending in the rotation direction of the rotating shaft; and a resistor provided on a protruding end side of the rotating shaft and in sliding contact with the resistor. And a sliding brush that is rotated by the rotation shaft in the above state.

Thus, when the rotating shaft rotates,
The sliding brush is slid in contact with the resistor on the casing (sensor body) side at a position corresponding to the rotation angle of the rotation shaft, and the rotation angle changes the resistance value between the resistor and the sliding brush. Can be detected as Further, the protruding end side of the rotating shaft can be rotatably supported by the sensor-side bearing, and in this state, the resistor and the sliding brush can be radially aligned.

Further, according to the third aspect of the present invention, a sliding cylinder is provided on the protruding end side of the rotating shaft in a non-rotating state, and the sliding cylinder slides in the sensor-side bearing of the rotating angle sensor. It is inserted as much as possible.

Thus, the sensor-side bearing of the rotation angle sensor can rotatably support the protruding end of the rotation shaft via the sliding cylinder.

Further, in the invention according to claim 4, the casing comprises a throttle body provided with a throttle chamber forming an intake passage of an internal combustion engine, the rotating shaft is located in the throttle chamber, and a valve body is provided. A valve shaft provided with the rotation angle sensor on a protruding end side of the valve shaft protruding outside from the throttle chamber via the bearing.

Thus, the valve shaft can be rotated together with the valve body using, for example, a wire drum on which a wire is wound, or an electric motor, and the amount of intake air of the internal combustion engine can be changed according to the opening degree of the valve body. Can be adjusted variably. At this time, the rotation angle of the valve shaft can be detected by the rotation angle sensor as the opening of the valve body.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rotation angle detecting device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show a first embodiment according to the present invention. In this embodiment, a throttle valve device used in an automobile engine or the like is taken as an example of a rotation angle detecting device. Will be explained.

Numeral 21 denotes a throttle body as a casing which is constructed in substantially the same manner as the conventional throttle body 1. The throttle body 21 has a throttle chamber 22, left and right bearing housings 23, 24 and the like. I have.
The tip side of the bearing housing portion 24 is the sensor mounting portion 24A.
The sensor accommodating chamber 24B is formed inside.

Reference numeral 25 denotes a valve shaft serving as a rotating shaft rotatably provided in the bearing accommodating portions 23 and 24 of the throttle body 21 by using the respective bearings 26. The valve shaft 25 is substantially the same as in the prior art. One end side in the axial direction is a protruding end 25 </ b> A that protrudes outside from the bearing housing portion 23. The valve shaft 25 has a valve plate 27 located in the throttle chamber 22 and a wire drum 28 located on the protruding end 25A side.
A retainer plate 29, a return spring 30, and the like are provided.

However, as shown in FIG. 2, the other end of the valve shaft 25 is a small-diameter protruding end 25B protruding outward from the bearing accommodating portion 24, and the protruding end 25B side is a sleeve of a throttle sensor 33 described later. It is rotatably supported by a bearing 41.

Numeral 31 denotes an annular retainer fitted and provided in the bearing accommodating portion 24. The retainer 31 fixes the outer ring of the bearing 26 together with the lip seal 32 in the bearing accommodating portion 24 as shown in FIG. doing. Also, the lip seal 32
Is disposed between the inner peripheral side of the retainer 31 and the valve shaft 25, and is provided from the throttle chamber 22 to the throttle sensor 33.
It prevents foreign substances such as dust and moisture from entering the inside.

Reference numeral 33 denotes a throttle sensor as a rotation angle sensor according to the present embodiment.
In the same manner as the throttle sensor 12 of the prior art, the sensor housing chamber 24B of the throttle body 21, a substantially disc-shaped sensor body 34 made of a resin material or the like, and the sensor body 34 facing the throttle body 21 Resistors 36, 36 fixed to the inner surface side of the
And a slider which is fixed to the outer periphery of the protruding end 25B of the valve shaft 25 via the brush holder 37 in the sensor mounting portion 24A of the throttle body 21 and rotates together with the valve shaft 25 in sliding contact with the resistors 36. The brushes 38, 38 and the like are provided.

A shaft insertion hole 34A is formed at the center of the sensor body 34. The shaft insertion hole 34A
Is a cap 3 fixed to the outer surface of the sensor body 34.
9 so that the sleeve bearing 41 and a seal member 42 described later can be easily inserted into the shaft insertion hole 34A.

Further, in the sensor body 34, a plurality of screw insertion holes 34B are formed at intervals on the outer peripheral side, and the sensor mounting portion 24A of the bearing housing portion 24 is formed by mounting screws 40 and the like inserted in the respective screw insertion holes 34B. The sensor body 34 is fixed to the throttle body 2 in this state.
One sensor accommodation room 24B is closed. Further, each resistor 36 is formed in an arc shape extending in the rotation direction of the valve shaft 25 with reference to the center of the sleeve bearing 41.

Reference numeral 41 denotes a sleeve bearing 41 as a sensor-side bearing formed of a metal material or a resin material. The outer periphery of the sleeve bearing 41 is fitted into a shaft insertion hole 34A of the sensor body 34, and the inner periphery of the sleeve bearing 41. Has the protruding end 2 of the valve shaft 25
The 5B side is rotatably inserted. Further, at one end of the sleeve bearing 41, a seal member 42 that is located in the shaft insertion hole 34A and seals between the valve shaft 25 and the sensor body 34 is provided.
This prevents foreign substances from entering the throttle sensor 33 from the first side.

The throttle valve device according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

In the present embodiment, however, the sleeve bearing 41 is provided on the sensor body 34 of the throttle sensor 33, and the protruding end 25B of the valve shaft 25 is provided by the sleeve bearing 41.
Since the valve shaft 25 is rotatably supported, the valve shaft 25 can be stably rotated while being supported by the bearings 26, the sleeve bearings 41, and the like, and the protruding end 25B of the valve shaft 25 is transmitted from the engine. Accordingly, displacement in the radial direction can be reliably prevented.

Further, by preliminarily determining the positional relationship between the sleeve bearing 41 and the substrate 35 (resistor 36) with high precision, when the throttle sensor 33 is assembled, the sensor body 34 is connected to the sensor mounting portion 2 of the throttle body 21.
By simply inserting the protruding end 25B side of the valve shaft 25 into the sleeve bearing 41 while abutting against the 4A, the resistor 36 and the sliding brush 38 are accurately positioned in the radial direction of the valve shaft 25. be able to.

Thus, the sensor body 34 can be efficiently assembled to the throttle body 21 without using the jig 20 or the like as in the prior art. Further, by providing the sleeve bearing 41 in the shaft insertion hole 34A of the sensor body 34, the durability of the sensor body 34 can be improved.

Accordingly, it is possible to prevent the displacement that occurs when the sensor body 34 is assembled, and the resistor 36 and the sliding brush 38
Can always be brought into sliding contact with each other in a stable state. Then, the rotation angle of the valve shaft 25 can be reliably detected by the throttle sensor 33, and the engine control can be smoothly performed using the detection signal from the throttle sensor 33, and the reliability can be improved.

Next, FIG. 3 shows a second embodiment according to the present invention. In this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description will be given. It shall be omitted. However, a feature of the throttle valve device according to the present embodiment is that a sliding cylinder 60 described later is provided on the protruding end 51A of the valve shaft 51.

Here, the valve shaft 51 has substantially the same configuration as the valve shaft 25 of the first embodiment, and the other end in the axial direction has a small-diameter projecting end 51A.
Is formed in a non-circular shape such as a D-shaped cross section, and a flat surface portion 51B is provided on the outer peripheral side.

The throttle sensor 52 includes a sensor body 53, a substrate 54, a resistor 55, a brush holder 56,
The sensor body 53 is provided with a bottomed shaft insertion hole 53A having a hole diameter larger than that of the shaft insertion hole 34A according to the first embodiment. . Further, a sleeve bearing 58 as a sensor-side bearing and a seal member 59 are provided in the shaft insertion hole 53A. The sleeve bearing 58 is connected to the valve shaft 51 via a sliding cylinder 60.
Of the protruding end 51A is rotatably supported.

Reference numeral 60 denotes a sliding cylinder fixed to the protruding end 51A of the valve shaft 51 in a detented state. The sliding cylinder 60 is formed in a bottomed cylindrical shape using a hard resin material or the like, and has an inner periphery thereof. Side is valve shaft 5
It is a non-circular mounting hole 60A corresponding to one protruding end 51A. The brush holder 56 is fixed to the outer periphery of one end of the sliding cylinder 60 in the axial direction, and the outer periphery of the other end is slidably inserted into the sleeve bearing 58.

Thus, also in the present embodiment having such a configuration, it is possible to obtain substantially the same operation and effect as in the first embodiment. And especially in this embodiment,
The sliding cylinder 60 having a bottomed cylindrical shape to which the brush holder 56 of the throttle sensor 52 is fixed on the outer peripheral side is connected to the protruding end 5 of the valve shaft 51.
When the brush holder 56 is mounted on the protruding end 51A of the valve shaft 51, the sliding cylinder 60 and the brush holder 56 are protruded from the protruding end 51A.
The sliding brush 57 can be easily positioned in the axial direction and the radial direction of the valve shaft 51 only by inserting and fitting the outer peripheral side of the throttle shaft and abutting against the front end surface thereof, thereby improving the assembly accuracy of the throttle sensor 52. Can be.

The shaft insertion hole 53A of the sensor body 53
Is formed as a bottomed hole, foreign matter can be prevented from entering the throttle sensor 52 from the outside, reliability can be further improved, and the number of components such as caps and the number of assembling steps can be reduced.

Next, FIG. 4 shows a third embodiment according to the present invention. The feature of this embodiment is that the rotation angle detecting device is constituted as an accelerator operation amount detecting device used for an electric throttle control. It is in.

Reference numeral 61 denotes a casing constituting a main body of the accelerator operation amount detecting device. The casing 61 is formed in a substantially U-shape having left and right bearing housing portions 61A and 62B, and is an electric throttle valve device. It is attached to the vehicle body at a position different from (not shown).

Reference numeral 62 denotes a bearing receiving portion 61 of the casing 61.
A rotating shaft provided on each of the bearings 63A and 62B so as to be rotatable using the bearing 63. The rotating shaft 62 has a protruding end 62A projecting outward from the bearing housing portion 61B.

On the outer peripheral side of the rotating shaft 62, a drum portion 64A is connected to an accelerator pedal of the vehicle using a wire (neither is shown) or the like. A retainer plate 65 that regulates the moving angle within a certain range is fixed in a detented state. Further, a return spring 66 that biases the rotation shaft 62 in the direction in which the accelerator pedal is returned is mounted on the outer peripheral side of the rotation shaft 62 via a holder or the like.

Reference numeral 67 denotes an accelerator sensor as a rotation angle sensor. The accelerator sensor 67 comprises a potentiometer or the like substantially similar to the throttle sensor 33 according to the first embodiment, and includes a sensor body 68, a substrate 69, a resistor 7
0, a brush holder 71, a sliding brush 72, and the like.

A shaft insertion hole 68A is provided at the center of the sensor body 68, and a sleeve bearing 73 as a sensor-side bearing is provided in the shaft insertion hole 68A. Reference numeral 73 rotatably supports the protruding end 62A of the rotating shaft 62.

When the driver operates the accelerator pedal, when the wire drum 64 is pulled through the wire, the rotating shaft 62 rotates together with the wire drum 64 against the return spring 66 and the accelerator sensor 67 Is the rotating shaft 62
And outputs a detection signal corresponding to the rotation angle to the control unit or the like. Thereby, the control unit drives an electric motor or the like provided in the electric throttle valve device using the detection signal or the like from the accelerator sensor 67,
With this electric motor, the valve element in the throttle chamber can be opened and closed according to the accelerator operation amount.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those in the first embodiment can be obtained, and the reliability of the accelerator operation amount detecting device can be improved. .

In each of the above embodiments, the shaft insertion holes 34 of the throttle sensors 33 and 52 and the accelerator sensor 67 are provided.
A, 53A, and 68A have sleeve bearings 41, 58, and 73, respectively.
However, the present invention is not limited to this, and the sleeve bearings 41, 58, 73 are omitted, and the sensor body 34,
The bearing shafts 53 and 68 may be provided with bearing holes for rotatably supporting the protruding ends 25B, 51A and 62A of the valve shafts 25 and 51 and the rotating shaft 62, and the sleeve bearings 41 and 5 may be provided.
Instead of 8, 73, the sensor-side bearing may be constituted by a rolling bearing.

In each of the above embodiments, the throttle sensors 33 and 52 and the accelerator sensor 67 are connected to the resistor 3
6, 55, 70 and the sliding brushes 38, 57, 72, but the present invention is not limited to this. For example, the present invention is not limited to this. A non-contact type rotation angle sensor having a pickup or an optical pickup using a photocoupler or the like may be used.

Further, in the first and second embodiments, the throttle valve device for rotating the valve shafts 25 and 51 by a wire or the like connecting the accelerator pedal of the vehicle and the wire drum 28 will be described as an example. However, the present invention is not limited to this, and may be applied to the electric throttle valve device described in the second embodiment. That is, the valve shaft may be driven by an electric motor or the like provided in the throttle valve device, and the protruding end side of the valve shaft may be rotatably supported by the sensor-side bearing of the throttle sensor.

[0061]

As described in detail above, according to the first aspect of the present invention, the rotation angle sensor is provided with a sensor-side bearing, and the protruding end side of the rotation shaft is rotatably supported by the sensor-side bearing. With this configuration, the rotating shaft can be stably rotated while being supported by the sensor-side bearing and the like, and the protruding end side can be reliably prevented from being displaced in the radial direction due to vibration or the like. In addition, when assembling the rotation angle sensor to the casing, simply insert the protruding end side of the rotation shaft into the sensor-side bearing of the rotation angle sensor and move the rotation angle sensor with respect to the radial direction of the rotation shaft. Positioning can be performed accurately, and the rotation angle sensor can be efficiently assembled to the casing. Accordingly, it is possible to prevent a displacement occurring at the time of assembling the rotation angle sensor, to stably detect the rotation angle of the rotation shaft, and to improve reliability.

According to the second aspect of the present invention, since the rotation angle sensor is constituted by the sensor body provided with the sensor-side bearing, the resistor and the sliding brush, the rotation shaft has a protruding end side. Can be stably supported by the sensor-side bearing of the sensor body. Further, when assembling the rotation angle sensor, the sensor body and the casing can be accurately positioned using the sensor-side bearing, the rotation shaft, and the like.
Thus, the resistor and the sliding brush can always be brought into sliding contact with each other in a stable state, and the detection accuracy of the rotation angle sensor can be kept good.

Further, according to the third aspect of the present invention, since the sliding cylinder is slidably inserted into the sensor-side bearing on the projecting end side of the rotating shaft, the rotating shaft is provided with the sliding cylinder. The protruding end side can be stably supported by the sensor-side bearing via the sliding cylinder, the turning shaft can be smoothly turned, and the durability of the sensor-side bearing can be improved.

According to the fourth aspect of the present invention, since the rotary shaft is formed as a valve shaft rotatably supported by the throttle body, the valve shaft is supported by a sensor-side bearing or the like together with the valve body. It can be rotated stably, and its rotation angle can be reliably detected as the opening of the valve body by the rotation angle sensor, and the operating state of the internal combustion engine can be smoothly controlled using the detection signal from the rotation angle sensor. Can be controlled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a throttle valve device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part in FIG. 1 showing a throttle sensor and the like.

FIG. 3 is an enlarged view of a main part showing a throttle sensor and the like of a throttle valve device according to a second embodiment.

FIG. 4 is an external view showing an accelerator operation amount detection device according to a third embodiment, partially cut away;

FIG. 5 is a longitudinal sectional view showing a conventional throttle valve device.

FIG. 6 is an enlarged view of a main part in FIG. 5 showing a conventional throttle sensor and the like.

FIG. 7 is an enlarged view of a main part as viewed from the same position as in FIG. 6, showing a state in which a sensor body is attached to a throttle body using a positioning jig or the like.

[Explanation of symbols]

 21 Throttle body (casing) 22 Throttle chamber 23, 24, 61A, 61B Bearing accommodating part 25, 51 Valve shaft (rotating shaft) 25B, 51A, 62A Projecting end 26, 63 Bearing 27 Valve plate (valve) 33, 52 Throttle sensor (rotation angle sensor) 34, 53, 68 Sensor body 36, 55, 70 Resistor 38, 57, 72 Sliding brush 41, 58, 73 Sleeve bearing (sensor-side bearing) 60 Sliding cylinder 61 Casing 62 times Active shaft 67 Accelerator sensor (rotation angle sensor)

Claims (4)

[Claims] 1. A casing provided with bearing housing portions on both left and right sides, bearings provided in each bearing housing portion of the casing, and provided rotatably in the casing using each bearing. A rotating shaft having a shaft end protruding to the outside of the casing via the bearing; and a rotating angle of the rotating shaft provided on the casing positioned on a protruding end side of the rotating shaft. And a rotation angle sensor that outputs a detection signal by detecting a rotation angle.
A rotation angle detection device, comprising a sensor-side bearing that rotatably supports a protruding end side of the rotation shaft. 2. The sensor body, wherein the rotation angle sensor is fixed to the casing at a position where an outer peripheral side surrounds a protruding end side of the rotational shaft, and the sensor body includes the sensor-side bearing provided on an inner peripheral side. A resistor provided on the sensor body facing the casing and extending in the rotation direction of the rotating shaft; and a resistor provided on a protruding end side of the rotating shaft and slidably contacting the resistor. 2. The rotation angle detecting device according to claim 1, wherein the rotation angle detection device comprises a sliding brush rotated by the rotation. 3. A sliding cylinder is provided on the projecting end side of the rotating shaft in a non-rotating state, and the sliding cylinder is slidably inserted into a sensor-side bearing of the rotating angle sensor. The rotation angle detection device according to claim 1. 4. The casing comprises a throttle body provided with a throttle chamber forming an intake passage of an internal combustion engine, and the rotating shaft is a valve shaft located in the throttle chamber and provided with a valve element. 4. The rotation angle detecting device according to claim 1, wherein said valve shaft is provided with said rotation angle sensor on a protruding end side protruding outside from said throttle chamber via said bearing.