JP3466466B2 - Rotation angle detector - Google Patents

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 preferably used for detecting a rotation angle of a rotating body,
In particular, for example, the present invention relates to a rotation angle detection device configured to detect an operation amount of an accelerator pedal or the like provided in a vehicle as a rotation angle of a rotor or the like and give hysteresis to the operation force.

[0002]

2. Description of the Related Art Generally, as a rotation angle detecting device for detecting a rotation angle of a rotating body, an accelerator operation amount detecting device for detecting an operation amount of an accelerator pedal is known (for example, Japanese Patent Laid-Open No. 9-272360). No.

This type of conventional accelerator operation amount detecting device includes a casing mounted on the vehicle side, a rotary shaft rotatably mounted on the casing, and connected to an accelerator pedal through a wire or the like. It is composed of a return spring for urging the rotating shaft in the returning direction of the accelerator pedal, a sensor unit for detecting the rotating angle of the rotating shaft as an accelerator operation amount, a hysteresis generating mechanism for the accelerator pedal, and the like. .

Here, the return spring is arranged on the outer peripheral side of the rotating shaft via a cylindrical spring holding member or the like. Further, the sensor unit is composed of, for example, a potentiometer, and is provided using a resistor provided on the casing side together with the sensor body and a mounting member such as a brush holder on the rotating shaft side in a state of sliding contact with the resistor. It is composed of a rotating sliding brush and the like.

Further, the hysteresis generating mechanism comprises a sliding plate provided on each of the casing side and the rotating shaft side, and a pressing spring for pressing these sliding plates into sliding contact with each other. When is rotated, the sliding plates slide with each other to give a frictional resistance force to the rotating shaft.

When the driver operates the accelerator pedal, the rotary shaft rotates against the return spring by a rotary angle corresponding to the accelerator operation amount. This allows
The sensor unit detects the rotation angle of the rotation shaft as a change in the resistance value of the resistor. Further, the hysteresis generation mechanism generates hysteresis with respect to the operation force of the accelerator pedal and stabilizes the operation feeling.

[0007]

By the way, in the above-mentioned prior art, since the accelerator operation amount detecting device is provided with the sensor portion and the hysteresis generating mechanism, for example, the sensor body, the resistor, the sliding brush, and the brush holder. Etc. and the hysteresis generation mechanism having two sliding plates, pressing springs, etc. increase the number of parts of the accelerator operation amount detection device, complicating the structure, and increasing the labor required for its assembly work. There is a problem that it takes.

Further, in the hysteresis generating mechanism, each sliding plate tends to generate abrasion powder by sliding for a long period of time, and when this abrasion powder enters the sensor portion, the resistance element and the sliding brush are separated from each other. The contact state of is likely to be unstable. Therefore, in the conventional technique, the sensor unit must be housed in a dedicated housing or the like or disposed at a position away from the hysteresis generation mechanism, and it is difficult to reduce the size of the entire device. .

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can surely reduce the number of parts related to the sensor portion, the hysteresis generation portion, etc., simplifying the structure and performing the assembling work. It is an object of the present invention to provide a rotation angle detection device that can improve efficiency, reduce the size of the entire device, and stably operate the sensor unit.

[0010]

In order to solve the above-mentioned problems, the invention of claim 1 is directed to a rotor-side body formed by opening a rotor accommodating chamber, and the rotor accommodating chamber with the rotor accommodating chamber closed. a sensor-side body provided fixedly on the opening side of the side body, the housed rotatably in the rotor housing chamber of the rotor-side body, and b <br/> over data that will be rotated by the rotation shaft, A sensor unit provided between the rotor and the sensor-side body for detecting a rotation angle when the rotor rotates relative to the sensor-side body; and a rotor-side body and a rotor. is provided between a spring for biasing said rotor to said sensor-side body, said sensor
Positioned radially outwardly of the support portion is provided between the sensor-side body and the rotor, and a hysteresis generating section that gives the resistance between the sensor-side body and the rotor by the biasing force of the spring, the hysteresis On the inner side in the radial direction of the generating part
It is located between the sensor-side body and the rotor and is configured to include a wear powder storage unit that stores the wear powder generated in the hysteresis generation unit.

With this configuration, when the rotor rotates about the rotation axis, the rotation angle can be detected by the sensor portion, and at this time, hysteresis is generated against an external force or the like that attempts to rotate the rotor. Hysteresis can be generated by the generator. Further, when abrasion powder is generated in the hysteresis generation portion, this abrasion powder can be stored in the abrasion powder storage portion, and it is possible to restrict the abrasion powder from entering the sensor portion side.

Further, in the invention of claim 2, the hysteresis generating portion faces a body side sliding portion provided on the sensor side body at a position surrounding the sensor portion, and faces the body side sliding portion. And a rotor-side sliding portion that is provided on the rotor and is in sliding contact with the body-side sliding portion by the urging force of the spring. The wear debris storage portion surrounds the sensor portion and the hysteresis generation portion. It is configured to be provided on the inner peripheral side of the body side sliding portion and the rotor side sliding portion over the entire circumference.

As a result, when the rotor rotates,
The body-side sliding portion and the rotor-side sliding portion of the hysteresis generating portion can be slid by the urging force of the spring, and the hysteresis generating portion can impart a frictional resistance force in the rotational direction to the rotor. Further, for example, even if abrasion powder is generated between the body-side sliding portion and the rotor-side sliding portion, this abrasion powder can be stored in the abrasion powder storage portion and the abrasion powder is prevented from entering the sensor portion side. can do.

Further, in the invention of claim 3, the wear debris storage portion includes a circumferential groove provided in one of the sensor side body and the rotor side body, and the sensor side body and the rotor side body. It is formed by an annular space secured between the other one and the partition wall provided by being fitted into the circumferential groove.

Thus, the space formed between the sensor side body and the rotor can be partitioned into the inner peripheral side and the outer peripheral side of the partition wall portion, and for example, a space for accumulating wear particles is secured on the outer peripheral side of the partition wall portion. can do. Then, the abrasion powder generated in the hysteresis generating portion can be stored in this space, and the abrasion powder can be prevented from entering the sensor portion side arranged on the inner peripheral side of the partition wall portion.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a rotation angle detecting device according to an embodiment of the present invention will be described in detail with reference to FIGS.

1 to 5 show a first embodiment according to the present invention. In this embodiment, an accelerator operation amount detecting device for an automobile or the like will be described as an example.

Reference numeral 1 denotes an accelerator device provided on a vehicle such as an automobile. The accelerator device 1 includes a mounting bracket 3 mounted on a vehicle body 2 and a connecting pin 4 at an intermediate portion in the longitudinal direction. 3, a pedal stay 5 rotatably attached to the pedal stay 3, the upper end side of which is engaged with a turning lever 16 via a roller 17 described later, an accelerator pedal 6 fixed to the lower end side of the pedal stay 5, and a mounting bracket 3 It is composed of an accelerator operation amount detection device 8 and the like which will be described later and is fixed to the shaft via bolts 7 and the like.

Then, the driver of the vehicle operates the accelerator pedal 6
When the pedal is depressed in the direction of arrow A in FIG. 1, the rotary lever 16 is moved by arrow B by the upper end of the pedal stay 5.
The rotation angle of the rotation shaft 15 is detected by the accelerator operation amount detection device 8 as the operation amount of the accelerator pedal 6 (accelerator operation amount).

Reference numeral 8 denotes an accelerator operation amount detecting device as a rotation angle detecting device according to the present embodiment. As shown in FIG. 2, the accelerator operation amount detecting device 8 has a rotor side body 9 and a sensor side body 11 which will be described later. The rotary shaft 15, the rotor 18, the return spring 21, the hysteresis generation portion 22, the abrasion powder storage portion 24, the sensor portion 25, and the like.

Reference numeral 9 denotes a rotor-side body formed of, for example, a resin material in a bottomed cylindrical shape. The rotor-side body 9 is composed of a cylindrical portion 9A, a bottom portion 9B and the like, and a rotor accommodating chamber 10 is provided therein. It is formed by opening. Further, a bottom portion 9B of the rotor-side body 9 is provided with a tubular support portion 9C that supports the rotating shaft 15 and a spring holding cylinder 9D.

Reference numeral 11 denotes a resin-made sensor-side body fixedly provided on the cylindrical portion 9A of the rotor-side body 9. The sensor-side body 11 is a substantially disk-shaped lid that closes the opening side of the cylindrical portion 9A. A lid 11A, a support 11B for the rotating shaft 15 which is provided in the center of the lid 11A in the shape of a cylinder with a bottom, a sliding projection 12, a circumferential groove 13, a connector 27, etc., which will be described later. In the lid portion 11A, the outer peripheral side of the sliding protrusion 12 is fixed to the opening side of the cylindrical portion 9A over the entire circumference by a fixing means such as caulking, welding, or adhesion.

[0023] 12 in the annular slide projection as the body-side sliding portion which constitutes the hysteresis generating section 24, the sliding projection 12, as shown in FIGS. 2 and 3, the sensor portion 25 diameter
The lid portion 1 of the sensor side body 11 at a position surrounding from the outside in the direction
1A protrudes from the outer peripheral side into the rotor housing chamber 10 and is fitted into the cylindrical portion 9A of the rotor side body 9, and the tip end side thereof is a tapered sliding surface with respect to the sliding surface 20 on the rotor 18 side. ing.

Reference numeral 13 denotes an annular peripheral groove which constitutes the wear debris storage portion 24. The peripheral groove 13 is located on the inner peripheral side of the sliding protrusion 12 as shown in FIGS. By forming the annular convex portion 14 on the lid portion 11 </ b> A, the lid portion 11 is positioned between the annular convex portion 14 and the sliding protrusion 12.
It is provided in A. A small gap S1 is formed between the tip of the annular convex portion 14 and the body portion 18A of the rotor 18.

Reference numeral 15 denotes a metal rotating shaft extending in the rotor housing chamber 10 in the axial direction. As shown in FIG. 2, the rotating shaft 15 has a support portion 9C of the rotor side body 9 on one side in the axial direction. It is rotatably supported, and the other end is rotatably supported by the support portion 11B of the sensor side body 11. One end of the rotary shaft 15 projects outside the rotor-side body 9, and a rotary lever 16 is fixed to the projecting end side together with the roller 17 in a rotation stop state.

Reference numeral 18 denotes a resin rotor rotatably accommodated in the rotor accommodating chamber 10.
5, a columnar body portion 18A fixed to the outer peripheral side, and an annular collar portion 1 radially protruding from the other end side outer periphery of the body portion 18A.
8B and a sliding surface 20, partition wall portion 23, etc., which will be described later,
It is configured to rotate integrally with the rotary shaft 15. Also,
The body portion 18A and the collar portion 18B form an annular spring accommodating space 19 between the cylinder portion 9A of the rotor-side body 9, the bottom portion 9B, and the spring holding cylinder 9D.

Reference numeral 20 denotes an annular sliding surface as a rotor-side sliding portion which constitutes the hysteresis generating portion 22.
Is the sliding protrusion 1 of the sensor side body 11 as shown in FIG.
2 is provided on the collar portion 18B of the rotor 18 so as to face the rotor 2, and is formed in a tapered shape on the outer periphery of the other side of the collar portion 18B.

Reference numeral 21 is a return spring disposed between the bottom portion 9B of the rotor-side body 9 and the flange portion 18B of the rotor 18. The return spring 21 is accommodated in the spring accommodating space 19 as shown in FIG. And the rotor 18
The sliding surface 20 is sandwiched by the collar portion 18B of the sensor side body 11
It is pressed against the sliding protrusion 12.

Reference numeral 22 denotes a hysteresis generating portion provided between the rotor side body 9 and the rotor 18. The hysteresis generating portion 22 is, as shown in FIG. 3, the sliding protrusion 12 of the sensor side body 11 and the rotor 18. Consisting of the sliding surface 20 of
The urging force of the return spring 21 is used to apply a frictional resistance force in the rotating direction of the rotor 18 to generate hysteresis with respect to the operating force of the accelerator pedal 6.

Reference numeral 23 denotes an annular partition wall portion which constitutes the wear debris storage portion 24, and the partition wall portion 23 is provided on the end surface of the flange portion 18B of the rotor 18 while being fitted in the circumferential groove 13 of the sensor side body 11. The rotor 18 projects in the axial direction toward the sensor side body 11. Further, the tip end side of the partition 23 is
A slight gap S is formed between the sensor side body 11 and the lid 11A.
Forming two.

Further, the width (radial direction) of the partition wall portion 23 is formed smaller than the groove width of the peripheral groove 13, so that the partition wall portion 23 is located inside the peripheral groove 13 on the inner peripheral side and the outer peripheral side. Radial gaps ΔL1 and ΔL2 are formed.

Reference numeral 24 denotes a wear powder storage portion provided between the sensor side body 11 and the rotor 18, and the wear powder storage portion 24
Is the gap ΔL1 between the inner circumferential side of the partition wall 23 and the circumferential groove 13.
The inner annular space 24A formed by the
And an outer annular space 24B formed by a gap .DELTA.L2 between the outer peripheral side and the circumferential groove 13.

Therefore, the inner annular space 24A and the outer annular space 24B forming the wear debris storage portion 24 are provided over the entire circumference at a position on the inner peripheral side of the hysteresis generating portion 22 and on the outer peripheral side of the sensor portion 25. Has been. Then, the wear debris storage unit 24 shields the sensor unit 25 side from the hysteresis generation unit 22, and the wear debris generated from the hysteresis generation unit 22 in this state is removed from the inner annular space 24A and the outer annular space 2.
While being stored in 4B, the abrasion powder is restricted from entering the sensor portion 25 side.

Reference numeral 25 denotes a sensor portion including a potentiometer provided between the rotor 18 and the sensor side body 11. The sensor portion 25 is a lid portion 11A of the sensor side body 11 as shown in FIGS. Board 25A fixed to
And a resistor 25B provided on the substrate 25 and extending in the rotation direction of the rotor 18, and a conductive sliding brush 25C fixed to the body 18A of the rotor 18, and the like. Connector 2 via wire 26, etc.
7 terminal 27A.

When the rotor 18 rotates,
The sliding brush 25C is placed in the resistor 2 at a position corresponding to the rotation angle.
Sliding with respect to 5B, the sensor unit 25 detects a change in the resistance value of the resistor 25B on the connector 27 side as the rotation angle of the rotor 18.

The accelerator device 1 according to the present embodiment has the above-mentioned structure, and its operation will be described below.

First, when the driver depresses the accelerator pedal 6 in FIG. 1, when the pedal stay 5 is rotated about the connecting pin 4 in the direction of arrow A, the rotating lever 16 is moved to the return spring 21. Rotate in the direction of arrow B against. As a result, in FIG. 2, the rotation shaft 15 of the accelerator operation amount detection device 8 rotates together with the rotor 18, and the rotation angle is detected by the sensor unit 25 as the accelerator operation amount.

When the driver releases the operation of the accelerator pedal 6, the rotating lever 16 is rotated in the direction opposite to the arrow B direction by the urging force of the return spring 21, and the pedal stay 5 is moved together with the accelerator pedal 6. It rotates in the direction opposite to the arrow A direction.

Furthermore, the sliding protrusion 12 and the sliding surface 20 of the hysteresis generating portion 22 slide while being pressed by the return spring 21 when the rotating shaft 15 rotates, and the rotating shaft 15 is rotated. It gives frictional resistance. And
This frictional resistance force causes hysteresis with respect to the operating force of the accelerator pedal 6.

On the other hand, when the resistor 25B of the sensor section 25 and the sliding brush 25C are worn and retracted while the accelerator device 1 is used for a long period of time, the sliding projection 12 of the hysteresis generating section 22 and the sliding projection 12 slide. The moving surface 20 is also worn in substantially the same manner, and the rotor 18 is slightly displaced toward the sensor side body 11 by the urging force of the return spring 21. As a result, the resistor 25B of the sensor unit 25 and the sliding brush 25C relatively come close to each other by the amount of the dimension that has been worn back, and the contact state (pressure) between them is the return spring 2.
It is held almost constant by 1.

If abrasion powder is generated due to abrasion of the sliding projection 12 and the sliding surface 20 of the hysteresis generating section 22, this abrasion powder is stored in the outer annular space 24 B of the abrasion powder storage section 24. Be accommodated. Then, the abrasion powder is the circumferential groove 1
3 has a large resistance when passing through a small gap S2 between the partition wall portion 23 and the partition wall portion 23.
It will be stored inside.

Further, even if a small part of the abrasion powder in the outer annular space 24B passes through the gap S2, this abrasion powder passes through the gap S1 between the annular convex portion 14 and the rotor 18. Since the resistance at the time of doing is large, it is in a state of being stored in the inner annular space 24A. As a result, the sensor portion 25 side is kept in a state of being shielded from the hysteresis generation portion 22 by the abrasion powder storage portion 24, and the abrasion powder generated in the hysteresis generation portion 22 does not enter the sensor portion 25 side.

Thus, in the present embodiment, the accelerator operation amount detecting device 8 includes the rotor side body 9, the sensor side body 11, the rotating shaft 15, the rotor 18, the sensor portion 25, the return spring 21, the hysteresis generating portion 22 and the like. Since it is configured as described above, it is not necessary to separately provide the sensor body for the sensor unit, the brush holder, and each sliding plate of the hysteresis generating mechanism as in the prior art, and these are shared by the sensor side body 11 and the rotor 18. The return spring of the prior art and the pressing spring of the hysteresis generating mechanism can be shared.

As a result, the number of parts of the entire device can be surely reduced, the structure thereof can be simplified, and the assembling work of the accelerator device 1 and the accelerator operation amount detecting device 8 can be efficiently performed.

Since the wear debris storage section 24 is provided on the inner peripheral side of the hysteresis generation section 22 at a position surrounding the sensor section 25, the sensor section 25 side is shielded from the hysteresis generation section 22 by the wear debris storage section 24. Even if the sliding projection 12 and the sliding surface 20 of the hysteresis generating part 22 are worn and wear powder is generated, this wear powder can be stably stored in the wear powder storage part 24, and the wear powder can be detected by the sensor. It is possible to reliably restrict the intrusion to the portion 25 side.

As a result, the resistor 25B of the sensor unit 25
It is possible to reliably prevent deterioration of the detection accuracy of the sensor unit 25 due to abrasion powder entering between the sliding brush 25C and the sliding brush 25C, and it is possible to operate the sensor unit 25 stably for a long period of time and also to improve reliability. It is possible to improve the sex.

That is, the inner annular space 2 of the wear debris storage portion 24
4A and an outer annular space 24B are provided on the inner peripheral side and the outer peripheral side of the partition wall portion 23 to form a slight gap S1 between the annular convex portion 14 and the rotor 18, and between the partition wall portion 23 and the circumferential groove 13. Since a slight gap S2 is also formed in the gap S1, the abrasion powder from the hysteresis generating portion 22 has a gap S1, S in the abrasion powder storage portion 24.
2 can be formed to have a long intrusion route when trying to enter the sensor section 25 side, and the clearance S1 of the abrasion powder storage section 24 can be formed.
, S2 can be used to prevent the abrasion powder from entering in two steps, and the abrasion powder can be stably stored in the inner annular space 24A and the outer annular space 24B.
Can be reliably protected against abrasion powder.

Further, by providing the wear debris storage portion 24, the sensor portion 25 and the hysteresis generating portion 22 are opposed to each other in the radial direction between the sensor side body 11 and the rotor 18.
The accelerator operation amount detecting device 8 can be reliably reduced in size in the axial direction.

Further, since the urging force of the return spring 21 is also applied to the sensor portion 25, even if the resistor 25B and the sliding brush 25C of the sensor portion 25 are worn and retracted, they will generate hysteresis. The sliding projection 12 of the portion 22 and the sliding surface 20 can be brought into relative contact with each other by utilizing wear. As a result, the contact pressure between the resistor 25B and the sliding brush 25C can be maintained at a substantially constant value by the return spring 21, and the detection operation of the sensor unit 25 can be stabilized.

Further, since the annular spring accommodating space 19 is formed between the rotor side body 9 and the rotor 18,
The return spring 21 can be stably accommodated in the spring accommodating space 19, and the return spring 21 can be surely prevented from being bent and displaced, and the conventional spring holding member and the like can be omitted.

On the other hand, since the annular sliding projection 12 is provided on the sensor side body 11, when the accelerator operation amount detecting device 8 is assembled, the sliding projection 12 is fitted into the cylindrical portion 9A of the rotor side body 9. , The sensor side body 11 can be accurately positioned with respect to the rotor side body 9, and at the time of assembling these, the resistor 25B of the sensor unit 25 and the sliding brush 2
5C can be reliably prevented from being displaced in the radial direction.

Next, FIG. 6 shows a second embodiment of the present invention. In this embodiment, the same components as those of the first embodiment are designated by the same reference numerals, and their description will be given. It shall be omitted. However, the feature of the accelerator operation amount detection device 31 according to the present embodiment is that the annular space 39 is formed only on the outer peripheral side of the partition wall portion 37 described later.

Here, the accelerator operation amount detection device 31 is
Accelerator operation amount detection device 8 according to the first embodiment
Almost the same as the rotor side body 9 and the sensor side body 3
2, a rotary shaft 15, a rotor 35 described later, a sensor unit 25, a return spring 21, a hysteresis generation unit 3 described later.
8 and the wear debris storage section 40 and the like.

The sensor side body 32 has a lid 32.
The rotor 35 includes a sliding surface 36, a partition wall 37, and the like. Then, the sliding protrusion 33 of the sensor side body 32
And the sliding surface 36 of the rotor 35 include a hysteresis generating portion 38
Are configured.

Further, the tip end side of the partition wall portion 37 is fitted into the circumferential groove 34, and a slight gap is formed between the tip end side and the bottom portion side of the circumferential groove 34. Further, an annular space 39 is defined between the partition wall portion 37 and the sliding protrusion 33, and the annular space 39 constitutes a wear debris storage portion 40.

Thus, in this embodiment having such a structure, it is possible to obtain substantially the same operational effects as those of the first embodiment.

Next, FIG. 7 shows a third embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. It shall be omitted. However, the feature of the accelerator operation amount detection device 41 according to the present embodiment is that the partition wall portion 44 is provided on the inner peripheral side of the sliding protrusion 43 with respect to the sensor side body 42, and the partition wall 44 is provided between the sliding protrusion 43 and the partition wall portion 44. An annular space 45 is formed in the inner surface of the rotor 46, and a peripheral groove 48 is provided in the rotor 46 on the inner peripheral side of the sliding surface 47.

Here, the sliding protrusion 43 and the sliding surface 47 constitute a hysteresis generating portion 49, and the annular space 45 constitutes an abrasion powder storage portion 50.

Thus, in this embodiment having such a structure, it is possible to obtain substantially the same operational effects as those of the first and second embodiments.

In each of the above embodiments, the sensor unit 2
The resistor 25B of 5 is provided on the sensor side bodies 11 and 32,
Although the sliding brush 25C is provided on the rotors 18, 35, 46, the present invention is not limited to this, and the resistor 25B is provided on the rotors 18, 35, 46, and the sliding brush 25C is provided on the sensor side bodies 11, 32. , 42 may be provided.

In each of the above embodiments, the accelerator operation amount detecting device 8 is provided with the contact-type sensor portion 25 including a potentiometer or the like, but the present invention is not limited to this, and may be, for example, a magnetoresistive element or a hole. A non-contact type sensor unit may be configured by an electromagnetic pickup using an element or the like or an optical pickup using a photo coupler or the like, and this may be provided in the accelerator operation amount detection device 8.

Further, in the above embodiment, the rotary shaft 15 is connected to the pedal stay 5 of the accelerator pedal 6 by using the rotary lever 16 and the like, but the present invention is not limited to this, and the rotary lever is not limited to this. In place of 16, for example, a wire drum or the like is provided on the rotating shaft 15, and the wire drum and the pedal stay 5 are connected by a wire or the like, and the rotating shaft 15 is rotated by the wire according to the operation amount of the accelerator pedal 6. It may be configured to move.

Further, in the above-mentioned embodiment, the case where the turning angle detecting device is used as the accelerator operation amount detecting device 8 is described as an example, but the present invention is not limited to this, and turning of an arbitrary rotating body is performed. You may apply to the rotation angle detection apparatus which detects an angle.

[0064]

As described above in detail, according to the first aspect of the invention, the rotation angle detecting device is provided with the rotor side body, the sensor side body, the rotation shaft, the rotor, the sensor section, the spring, the hysteresis generating section and the wear. Because it is composed of powder storage,
A sensor unit and a hysteresis generating section while blocked by abrasion powder reservoir, the radial direction between the rotor and the sensor-side body
They can be arranged facing each other at substantially the same position in the axial direction, and the sensor part, the mounting member for the hysteresis generating part, etc. can be shared by the sensor side body and the rotor. This ensures that the number of parts can be reduced compared to the conventional technology,
The structure can be simplified, the entire device can be downsized, and the assembling work can be performed efficiently. Further, for example, even when abrasion powder is generated in the hysteresis generation portion, this abrasion powder can be stably stored in the abrasion powder storage portion, and it is possible to reliably restrict the abrasion powder from entering the sensor portion side. As a result, the sensor unit can be stably operated for a long period of time, and reliability can be improved.

According to the second aspect of the present invention, the wear debris storage part is surrounded by the sensor part from the radially outer side on the inner peripheral side of the body side sliding part and the rotor side sliding part of the hysteresis generating part. The sensor unit located on the inner peripheral side of the wear debris storage unit can be reliably shielded from the hysteresis generation unit located on the outer side in the radial direction. Even if the side sliding part is worn and wear powder is generated, the wear powder can be stably stored in the wear powder storage part, and the wear powder can be reliably restricted from entering the sensor part side. it can.

Further, according to the third aspect of the present invention, since the wear debris storage portion is constituted by the annular space formed between the circumferential groove and the partition wall portion, the wear debris from the hysteresis generating portion is on the sensor portion side. The intrusion path when trying to enter the can be formed long by the peripheral groove and the partition wall, the sensor part can be shielded from the hysteresis generation part, and the abrasion powder generated in the hysteresis generation part is stably stored in the annular space. You can
It is possible to reliably protect the sensor unit against the intrusion of abrasion powder.

[Brief description of drawings]

FIG. 1 is an external view showing an accelerator device to which an accelerator operation amount detecting device according to a first embodiment of the present invention is applied.

FIG. 2 is a vertical cross-sectional view showing an accelerator operation amount detection device according to the first embodiment.

FIG. 3 is an enlarged view of a main part in FIG. 2 showing a hysteresis generation part, an abrasion powder storage part, etc. of the accelerator operation amount detection device.

4 is a cross-sectional view as seen from the direction of arrows IV-IV in FIG.

FIG. 5 is an exploded perspective view showing an accelerator operation amount detection device in an enlarged manner.

FIG. 6 is an enlarged view of an essential part showing an accelerator operation amount detection device according to a second embodiment.

FIG. 7 is an enlarged view of an essential part showing an accelerator operation amount detection device according to a third embodiment.

[Explanation of symbols]

8, 31, 41 Accelerator operation amount detection device (rotational angle detection device) 9 Rotor side body 10 Rotor housing chambers 11, 32, 42 Sensor side body 12, 33, 43 Sliding protrusion (body side sliding portion) 13, 34, 48 Circumferential groove 15 Rotating shaft 18, 35, 46 Rotor 20, 36, 47 Sliding surface (rotor side sliding part) 23, 37, 44 Partition wall part 24, 40, 50 Wear powder storage part 24A Inner annular space 24B Outer annular space 25 Sensor part 21 Return spring (spring) 22,38,49 Hysteresis generating part 39,45 Annular space

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-299874 (JP, A) JP-A-7-305721 (JP, A) Fukukaihei 6-59654 (JP, U) Special Tables 4- 504238 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01B ⁷ /30-7/30 G01D 5/16 G05G 1/00-25/04 F02D 9/00-11/10

Claims (3)

(57) [Claims] 1. A rotor-side body formed by opening a rotor housing chamber, a sensor-side body fixedly provided on the opening side of the rotor-side body in a state of closing the rotor housing chamber, and the rotor. housed rotatably in the rotor housing chamber side body, a rotor that will be rotated by the rotation shaft, is provided between the sensor-side body and the rotor, the relative said rotor relative to said sensor-side body Of the sensor unit for detecting a rotation angle at the time of mechanical rotation, a spring provided between the rotor-side body and the rotor for urging the rotor toward the sensor-side body, and a sensor unit of the sensor unit. positioned radially outwardly provided between the sensor-side body and the rotor, and a hysteresis generating section that gives the resistance between the sensor-side body and the rotor by the biasing force of the spring, the hysteresis Located radially inside of the cis generator provided between the sensor-side body and the rotor, configured to become rotational angle detection and a worn powder reservoir for storing the abrasion powder generated by the hysteresis generating section apparatus. 2. The hysteresis generating section is provided on the body side sliding section provided on the sensor side body at a position surrounding the sensor section, and on the rotor facing the body side sliding section. A rotor-side sliding portion that is in sliding contact with the body-side sliding portion by the urging force of the spring, and the wear debris storage portion surrounds the sensor portion and a body-side sliding portion of the hysteresis generation portion. The rotation angle detection device according to claim 1, wherein the rotation angle detection device is provided on the inner peripheral side of the rotor-side sliding portion over the entire circumference. 3. The wear debris storage portion includes a circumferential groove provided on one of the sensor side body and the rotor side body, and the circumferential groove on the other side of the sensor side body and the rotor side body. The rotation angle detection device according to claim 1 or 2, wherein the rotation angle detection device is formed by an annular space secured between the partition wall and the partition wall.