JPH11173807A - Detection apparatus for rotation angle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage of a brush and a resistor and prolong the apparatus life by setting the location of a cover with respect to a housing hole when installing the cover to a casing. SOLUTION: A valve axis 28 that projects in a housing hole 27 of a sensor case 25 is installed and a rotation plate 32 having a brush 33 is installed to the valve axis 28. Also, a substrate 36 with a resistance film is installed on the cover 34 side and an circular arc-shaped engaging projection 39 from the cover 34 is projected. When the case installed on the sensor case 25, the cover 34 is automatically positioned in the diameter direction to the sensor case 25 by engaging the engaging rejection to the surrounding wall of the housing hole 27.

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 suitable for detecting, for example, a rotation angle of a rotation shaft, and more particularly to a throttle opening of an automobile engine or an accelerator pedal. The present invention relates to a rotation angle detection device configured to detect an operation amount of the rotation angle.

[0002]

2. Description of the Related Art Generally, a vehicle quantity engine is provided with a throttle valve for variably controlling an intake air amount in accordance with an accelerator operation amount or the like.
It is rotatably attached to the throttle body via a valve shaft. The throttle body is formed of a metal material such as aluminum die cast, and has a shaft insertion hole through which the valve shaft is inserted. The throttle body is provided with a throttle sensor as a rotation angle detecting device which is located at one end of the valve shaft and detects the opening degree of the throttle valve.

[0003] The conventional throttle sensor is provided integrally with the throttle body and has a sensor case having a rotary plate receiving hole on an end face side, and is rotatably provided in a shaft insertion hole of the throttle body. A valve shaft protruding into the rotary plate receiving hole of the sensor case, a rotary plate provided in the rotary shaft and located in the rotary plate receiving hole and integrally provided with a brush made of a conductive material; A cover body detachably provided on the throttle body to cover a rotary plate housing hole of the throttle body; and a brush provided on the cover body and sliding on a surface side facing the rotary plate. And a substrate on which a contacting resistor is formed.

The throttle sensor is constituted as a potentiometer comprising a resistor and a brush. The brush is integrally connected to a valve shaft by a rotating plate, and the brush is displaced on the resistor by sliding displacement. Is detected as the opening of the throttle valve.

[0005]

In the conventional throttle sensor described above, when the cover is assembled to the sensor case of the throttle body, the cover is abutted so as to cover the rotary plate receiving hole of the sensor case. In the state
The lid is fixed to the sensor case by a set screw or the like.

For this reason, in the prior art, the lid may be displaced with respect to the sensor case during the assembly of the lid until the lid is fixed with screws or the like. When the resistor or the substrate moves relative to the brush, the brush may be damaged, or the resistor may be damaged by the tip of the brush, thereby lowering the reliability of the rotation angle detection device. There's a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention is such that when a lid is attached to a rotary plate receiving hole side of a casing, the lid is automatically inserted into the rotary plate receiving hole. It is an object of the present invention to provide a rotation angle detection device that can be positioned, can prevent a brush or the like from being damaged, and can improve durability and life.

[0008]

A rotation angle detecting device to which the present invention is applied has a casing having a rotary plate receiving hole on an end face and a shaft insertion hole communicating with the rotary plate receiving hole, and the casing. Is provided rotatably in the shaft insertion hole of
A rotating shaft that protrudes into the rotating plate housing hole, a rotating plate that is provided in the rotating shaft and that is provided in the rotating plate housing hole and that is integrally provided with the brush made of a conductive material, and a resin material; A lid formed detachably provided on the casing to cover the rotary plate receiving hole of the casing, and a resistor provided on the lid and having the brush slidably in contact with a surface side facing the rotary plate. Are formed on the substrate.

Then, in order to solve the above-mentioned problem,
The feature of the structure adopted by the invention of claim 1 is that the lid has a structure in which the resistor of the substrate is restricted from being displaced in the radial direction of the rotating shaft with respect to the brush of the rotating plate. That is, an engaging projection that engages with the receiving hole is provided.

With this configuration, the potentiometer can be constituted by the resistor formed on the substrate and the brush mounted on the rotating plate. Therefore, when rotating the rotating shaft, the brush moves on the resistor. As the brush slides, the resistance value changes according to the brush position on the resistor, and the rotation angle of the rotation shaft can be detected based on the resistance value.

When the lid is assembled to the rotary plate receiving hole, the engaging projection is engaged with the rotary plate receiving hole of the casing, so that the resistor of the substrate rotates with respect to the brush of the rotary plate. The displacement in the radial direction can be restricted, and the brush is not worn or damaged during the assembling operation.

According to the second aspect of the present invention, the engaging projection is formed with a constant length in the depth direction of the rotary plate housing hole, and when the lid is attached to the casing, the resistor comes into contact with the brush. Previously, it was configured to engage with the peripheral wall of the rotating plate housing hole.

With this configuration, for example, the distance (length) from the substrate to the tip of the engagement projection can be made longer than the protrusion dimension of the brush projecting from the rotary plate housing hole of the casing. Before it contacts the resistor,
The engaging projection can be engaged with the peripheral wall of the rotating plate housing hole.

According to a third aspect of the present invention, the casing is formed of a throttle body, and the rotating shaft is formed of a valve shaft of a throttle valve.

Thus, the rotation angle detecting device can be used as, for example, a throttle sensor, and the opening of the throttle valve can be detected as the rotation angle.

According to a fourth aspect of the present invention, the casing includes a mounting frame mounted on the vehicle for detecting an accelerator operation amount, and the rotating shaft has a wire drum connected to an accelerator pedal of the vehicle via a wire. The configuration is provided.

Thus, the rotation angle detection device can be applied to the accelerator operation amount detection device, and the operation amount of the accelerator pedal can be detected.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotation angle detecting device according to the present invention will be described below in detail with reference to FIGS.

Here, an example in which the rotation angle detecting device according to the first embodiment is applied to a throttle sensor of an electric throttle device will be described with reference to FIGS. 1 to 7.

Reference numeral 1 denotes a throttle valve device, which is disposed in the middle of an intake passage of the engine. In addition, the throttle valve device 1 opens and closes a later-described throttle valve 30 by an electric motor 2.

Reference numeral 3 denotes an accelerator pedal which is located on the driver's cab side of the vehicle and is provided at the foot of a driver's seat (both not shown). The accelerator pedal 3 is operated by the driver when the vehicle starts or accelerates. When the stepping operation is performed and the stepping operation is released, the vehicle is decelerated or stopped.

Reference numeral 4 denotes an accelerator operation amount detecting device which detects an operation amount of the accelerator pedal 3. The accelerator operation amount detecting device 4 includes, for example, a casing 5 mounted near the accelerator pedal 3 in an engine room of a vehicle; A rotation shaft 6 rotatably provided on the casing 5, a wire drum 8 provided on the rotation shaft 6 and connected to a wire 10 described later, and a rotation angle of the rotation shaft 6 are detected. And an accelerator sensor 9 as a rotating angle detecting device.

Reference numeral 10 denotes a wire connecting the accelerator pedal 3 and the wire drum 8 of the accelerator operation amount detecting device 4. The wire 10 transmits the driver's operation force on the accelerator pedal 3 to the wire drum 8, and controls the accelerator operation. The wire drum 8 and the rotation shaft 6 are rotated at a rotation angle corresponding to the amount.

Reference numeral 11 denotes a control unit constituted by a microcomputer or the like. The input side of the control unit 11 is connected to a throttle sensor 31 and an accelerator sensor 9 described later, and the output side is connected to the electric motor 2. And the control unit 11
A drive signal corresponding to the detection signal from the accelerator sensor 9 is output to the electric motor 2, and the electric motor 2 opens and closes the throttle valve 30 at an opening corresponding to the operation amount of the accelerator pedal 3.

The control unit 11 detects the actual valve opening of the throttle valve 30 based on a signal from the throttle sensor 31, and the actual valve opening becomes the target valve opening corresponding to the accelerator operation amount. Thus, the feedback control of the electric motor 2 is performed.

Next, FIGS. 2 to 7 illustrate the throttle valve device 1 employed in the present embodiment.

Reference numeral 21 denotes a throttle body which forms the outer shape of the throttle valve device 1. The throttle body 21 is formed of a metal material such as aluminum die-cast, and has therein an intake air communicating with an engine cylinder (not shown). A throttle chamber 22 is formed as a passage. The throttle body 21 is not limited to aluminum die cast or the like, but may be a resin molded product formed of a high-performance resin material having heat resistance, for example.

Further, a motor housing case 23 for housing the electric motor 2 is formed integrally with the throttle body 21 at a position separated from the throttle chamber 22 by a certain distance. Further, the throttle body 21 is integrally formed with a gear case 24 which is located at one end of a valve shaft 28 described later and houses a reduction gear mechanism (not shown). The sensor case 25 constituting a part of the sensor 31 is formed integrally.

Here, a shaft insertion hole 25A through which a valve shaft 28 to be described later is inserted is formed in the sensor case 25 so as to communicate with the housing hole 27, and around the opening of the housing hole 27, 3
A plurality of screw holes 25B (see FIG. 5) are formed.

The reduction gear mechanism reduces the rotation of the rotating shaft by the electric motor 2 and transmits a large rotational driving force to a valve shaft 28 of a throttle valve 30 described later. The gear reduction mechanism is accommodated in a gear case 24 of the throttle body 21 and is covered by a cover 26.

Reference numeral 27 denotes a rotary plate receiving hole (hereinafter referred to as a receiving hole 27) formed in the sensor case 25.
Is composed of a deep circular hole 27A and a shallow rectangular hole 27B communicating with the circular hole 27A.
The shaft insertion hole 2 communicating with the circular hole 27A is formed at the bottom of the shaft insertion hole 2A.
5A are formed.

Numeral 28 denotes a valve shaft as a rotation shaft provided rotatably on the throttle body 21 via a bearing 29 and the like.
The valve shaft 28 is made of a high-strength metal rod or the like, and extends radially through the inside of the throttle chamber 22 of the throttle body 21. The end of the valve shaft 28 has the shaft insertion hole 2.
5A, and protrudes toward the sensor case 25 side. Further, the valve shaft 28 has a throttle valve 30 integrated at an intermediate portion in the longitudinal direction.
It is configured to be driven to close.

Reference numeral 30 denotes a valve shaft 2 in the throttle chamber 22.
A throttle valve rotatably provided through 8
The throttle valve 30 is formed of a disc-shaped valve plate, and its outer dimensions correspond to the inner diameter of the throttle chamber 22. The throttle valve 30 is rotated between a valve closing position and a valve opening position, and variably adjusts the intake air amount of the engine according to the opening degree.

Reference numeral 31 denotes a throttle sensor serving as a rotation angle detecting device. The throttle sensor 31 includes the sensor case 25, a rotating plate 32 and a lid 34, which will be described later.

Reference numeral 32 denotes a rotary plate. The rotary plate 32 is formed of a resin material as a substantially elliptical plate as shown in FIG. And
The rotating plate 32 is housed in the circular hole 27A of the sensor case 25 and is rotated integrally with the valve shaft 28.

Reference numerals 33, 33 denote brushes mounted on the rotating plate 32. Each of the brushes 33 has a base portion 33A fixed to the rotating plate 32 and a center of the rotating shaft 28 from the base portion 33A. And a pair of contact pieces 33B extending in the tangential direction of the circle. Each of the contact pieces 33B is provided in the accommodation hole 2.
7 is bent in a direction protruding upward from the
1 (see FIG. 7) and hold the sensor case 25 (accommodation hole 2).
7) protrudes toward the lid 34 side.

Numeral 34 denotes a lid. The lid 34 includes a lid 34A for covering the accommodation hole 27 and a lid 3 as shown in FIG.
Substrate accommodation portion 34B formed in 4A and accommodating substrate 36
And a connector portion 34C integrally formed with the lid portion 34A.
A plurality of pin terminals 34D embedded so as to extend from the accommodation portion 34B to the connector portion 34C, and a ring groove 34E formed so as to surround the substrate accommodation portion 34B and having an O-ring 35 mounted thereon, 3 around the lid 34A
And a mounting hole 34F formed at a location.

Each mounting hole 34F is formed in an elliptical shape so that the mounting position can be finely adjusted when the lid 34 is mounted on the sensor case 25. Further, the connector unit 34C is connected to the control unit 1 via a cable.
1 and outputs the rotation angle of the throttle valve 30 to the control unit 11 as an electric signal.

Reference numeral 36 denotes a substrate accommodated in a substrate accommodating portion 34B of the lid 34. The substrate 36 is formed in a disk shape by using an insulating material such as ceramic, and has a shaft hole 36A formed at the center thereof. I have.

Reference numeral 37 denotes a resistive film serving as a resistor. As shown in FIG. 6, the resistive film 37 has a first arc portion 37A formed in a wide arc shape on the outer side and a first arc portion 37A formed on the inner side. The first circular arc portion 3 is formed in a narrow circular arc shape.
7A, a second circular arc portion 37B connected on the distal end side,
And a draw-out arc portion 37C disposed between the arc portion 37A and the second arc portion 37B.
7A, 37B, and 37C are formed as concentric concentric resistance patterns extending symmetrically.

Then, the arc portions 37A, 37B, 37C
Terminals 37D are connected to the base end side of each of them, and each terminal 37D is connected to a pin terminal 34D of the lid 34 by a lead terminal 38 connected by means such as soldering. Further, since the resistance film 37 constitutes a potentiometer together with the brush 33, each contact piece 3 of the brush 33 is formed.
3B is brought into sliding contact with the surface of the first circular arc portion 37A and the surface of the circular arc portion 37C for drawing out, so that the pin terminal 34D of the first circular arc portion 37A and the pin terminal 34D of the circular arc portion 37C for drawing out.
The valve opening of the throttle valve 30 is detected from the resistance value between.

Reference numeral 39 denotes an engagement projection formed as an arc-shaped projection extending in a substantially C-shape. The engagement projection 39 has an outer diameter corresponding to the accommodation hole 27 of the sensor case 25 and has a cover 34.
And is provided so as to surround the periphery of the substrate accommodating portion 34B of the lid 34. When the lid 34 is attached to the sensor case 25 of the throttle body 21, the resistive film 37 of the substrate 36 is formed by engaging the engagement protrusion 39 with the peripheral wall of the circular hole 27 </ b> A of the accommodation hole 27. The displacement of the valve shaft 28 in the radial direction with respect to the brush 33 is restricted. The protrusion L2 of the engagement protrusion 39 from the substrate 36 is equal to the protrusion L of the contact piece 33B.
It is set to a dimension longer than 1.

Reference numeral 40 denotes a screw for attaching the cover 34 to the sensor case 25 of the throttle body 21.

In the throttle valve device using the throttle sensor according to the present embodiment, when a detection signal corresponding to the operation amount of the accelerator pedal 3 is input from the accelerator sensor 9 to the control unit 11, the control unit 11 Set the target opening from the detection signal,
A drive signal for opening the throttle valve 30 to the target opening is output to the electric motor 2, and the throttle valve 30 rotates. And the control unit 11
Monitors the valve opening of the throttle valve 30 with a detection signal from the throttle sensor 31 and performs feedback control so that the throttle valve 30 reaches the target opening.

Next, the operation of the throttle sensor 31 will be described with reference to FIGS.

First, the cover 34 is brought into contact with the accommodation hole 27 side of the sensor case 25, and each screw hole 2 on the sensor case 25 side is contacted.
It is fixed with screws 40 so that the mounting hole 34F coincides with 5B. At this time, as shown in FIG.
The contact pieces 33B of the brush 33 are in sliding contact with the first arc portion 37A and the drawing arc portion 37C of the resistive film 37 of the substrate 36 provided on the side.

Next, when the valve shaft 28 rotates in this state,
Each brush 33 has a first arc portion 37A and a drawing arc portion 3
7C, the terminal 37D of the first circular arc portion 37A and the terminal 37D of the circular arc portion 37C for drawing out.
The voltage between D and D changes according to the change in the resistance value. Since the voltage change at this time corresponds to the opening of the throttle valve 30, this is detected as the rotation angle of the throttle valve 30.

Here, in the throttle sensor 31 according to the present embodiment, since the cover 34 is provided with the engagement projection 39, when the cover 34 is attached to the accommodation hole 27 of the sensor case 25, the engagement projection 39 is provided. The cover 34 can be automatically positioned in the radial direction with respect to the accommodation hole 27 by engaging with the peripheral wall of the accommodation hole 27. Thus, the displacement of the resistance film 37 of the substrate 36 with respect to the brush 33 of the rotary plate 32 in the radial direction of the valve shaft 28 can be restricted. After the engagement, the movement of the lid 34 with respect to the accommodation hole 27 is
And the rotation can coincide with the direction in which the brush 33 slides with respect to the resistance film 37.

As a result, after the brush 33 comes into contact with the substrate 36 or the resistive film 37, the lid 34 moves only by rotation about the valve shaft 28. It is possible to prevent the resistive film 37 from moving in various directions with respect to the brush 33, restrict the application of unnecessary stress to the brush 33, and eliminate damage to the brush 33 and the resistive film 37. The life of the brush 33 and the resistance film 37 can be extended, and the reliability of the throttle sensor 31 can be improved.

Further, in the throttle sensor 31, FIG.
As shown in FIG. 7, the protrusion L2 from the substrate 36 to the tip of the engagement protrusion 39 is set longer than the protrusion L1 of the brush at the portion protruding from the throttle body 21 (sensor case 25). Engagement protrusion 3 on the peripheral wall of 27
The cover 34 can be moved in a state where the brush 33 is not in contact with the resistance film 37 until the engagement of the brush 9 occurs.

Then, the engaging projection 39 is engaged with the circular hole 27A of the receiving hole 27 so as to engage with the seal, so that the engaging projection 39 is inserted into the circular hole 27A and the vicinity of the receiving hole 27 is formed. When the mounting hole 34F of the cover 34 is brought into contact with the brush 33, the brush 33 is brought into sliding contact with the resistor 37 on the substrate 36 as shown in FIG. As described above, the engagement projections 39 are
The brush 33 and the resistive film 37 can be prevented from being damaged before they are engaged, and the life can be extended.

FIGS. 8 to 10 show a case where the rotation angle detecting device according to the second embodiment of the present invention is applied to an accelerator operation amount detecting device. The feature of this embodiment is that a casing is formed from a mounting frame that is mounted on a vehicle in order to detect an accelerator operation amount, and a wire drum connected to an accelerator pedal of the vehicle via a wire is provided on a rotating shaft. The configuration is provided. Further, in the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

An accelerator operation amount detecting device 41 is used in place of the accelerator operation amount detecting device 4 described in the first embodiment. The accelerator operation amount detecting device 41 includes a mounting frame 42 and a wire drum 50 described later. , A retainer plate 51, an accelerator sensor 53 and the like.

Reference numeral 42 denotes a mounting frame for the accelerator operation amount detecting device 41. The mounting frame 42 includes a base 43,
One side arm portion 44 erected on one end side of the base portion 43,
A spring hook, which is formed in a U-shape as a whole by the other arm part 45 erected on the other end side of the base part 43, and a return spring 52 described later is hooked on the one arm part 44. A portion 44A is provided. The mounting frame 42 is formed of a metal material such as aluminum die-cast, and constitutes a casing of the rotation angle detecting device. In addition, the mounting frame 42 is not limited to aluminum die-casting or the like, and for example, a resin molded product formed of a highly functional resin material having heat resistance may be used.

Reference numeral 46 denotes a sensor case integrally formed with the one arm portion 44 of the mounting frame 42. The sensor case 46 has a shaft insertion hole 46 A through which a rotating shaft 48, which will be described later, is communicated with the accommodation hole 47. In the vicinity of the opening of the accommodation hole 47, three screw holes 46B (see FIG. 9) are formed.

Reference numeral 47 denotes a rotary plate receiving hole (hereinafter referred to as a receiving hole 47) formed in the sensor case 46.
7 comprises a deep circular hole 47A and a shallow rectangular hole 47B communicating with the circular hole 47A.
The shaft insertion hole 4 communicating with the circular hole 47A is provided at the bottom of 7A.
6A are formed.

Reference numeral 48 denotes a turning shaft which is turned according to the operation amount of the accelerator pedal 3.
The second arm portions 44 and 45 are rotatably supported via bearings 49. A wire drum 50 and a retainer plate 51 are fitted in an intermediate portion of the rotating shaft 48 in a detented state. Further, one end of the rotating shaft 48 has a shaft insertion hole 46A.
And constitutes a part of the accelerator sensor 53 by protruding into the accommodation hole 47. On the other hand, the other end of the rotating shaft 48 is connected to a hiss generator (not shown) that gives frictional resistance when the accelerator pedal 3 is operated.

Reference numeral 50 denotes a wire drum provided on the outer peripheral side of the rotary shaft 48. The wire drum 50 is attached to the rotary shaft 48, and is bent from the outer periphery of the mount plate 50A. Two extending arms 50B (only one is shown) and a spring hook 50C protruding from the outer periphery of the mounting plate 50A
And a drum portion 50D fixed to the distal end side of the arm portions 50B, 50B.

Reference numeral 51 denotes a retainer plate which is in contact with the other side surface of the wire drum 50 and is provided on the rotating shaft 48 in a state of being prevented from rotating. On the outer peripheral side of the retainer plate 51, an engaging claw bent in an L-shape is provided. 51A are formed.

Numeral 52 denotes a return spring disposed on the outer peripheral side of the rotating shaft 48. The return spring 52 has a base end on the mounting frame 4 side.
2 and is hooked on the spring hook 50C of the wire drum 50 at the tip end side.
As a result, the return spring 52 is constantly biased in the direction opposite to the rotation direction when the wire drum 50 depresses the accelerator pedal 3. Then, the return spring 52
Is to return the accelerator pedal 3, the rotating shaft 48, and the like to the initial position when the driver releases the depression operation of the accelerator pedal 3.

Reference numeral 53 denotes an accelerator sensor as a rotation angle detecting device. The accelerator sensor 53 includes a sensor case 46 having a housing hole 47, a rotating plate 54 and a lid 56, which will be described later.

As shown in FIG. 9, the rotary plate 54 is formed of a resin material as a plate, and is fixedly located at the tip end of the rotary shaft 48. And
The rotating plate 54 is housed in the circular hole 47 </ b> A of the sensor case 46 and is rotated integrally with the rotating shaft 48.

Reference numerals 55, 55, and 55 denote brushes mounted on the rotating plate 54. Each of the brushes 55 includes a base end 55A fixed to the rotating plate 54, and a rotating shaft 48 from the base end 55A.
A pair of contact pieces 55B extending in the tangential direction of a circle centered on
It is composed of Each contact piece 55B is bent in a direction protruding upward from the accommodation hole 47. The brush 55 located outside of the brushes 55 arranged in parallel constitutes an idle switch together with a switch arc portion 59D described later.

As shown in FIG. 10, reference numeral 56 denotes a lid. The lid 56 includes a lid 56A for covering the accommodation hole 47 and a substrate accommodation 56B formed in the lid 56A for accommodating the substrate 58.
And a connector portion 56C integrally formed with the lid portion 56A.
A plurality of pin terminals 56D embedded so as to extend from the accommodation portion 56B to the connector portion 56C, and a ring groove 56E formed so as to surround the substrate accommodation portion 56B and having an O-ring 57 mounted thereon, 3 around the lid 56A
And a mounting hole 56F formed at a location.

Each of the mounting holes 56F is formed in an oval shape so that the position at which the lid 56 is mounted to the one arm 44 can be finely adjusted. Further, the connector section 56C is connected to the control unit 11 via a cable,
The operation amount of the accelerator pedal 3 is output to the control unit 11 as an electric signal.

Reference numeral 58 denotes a substrate accommodated in the substrate accommodating portion 56B of the lid 56. The substrate 58 is formed in a disk shape by using an insulating material such as ceramic, and has a shaft hole 58A formed at the center thereof. I have.

Reference numeral 59 denotes a resistive film as a resistor. As shown in FIG. 10, the resistive film 59 includes first circular arc portions 59A, 59A formed on the left and right sides and formed in a wide circular arc shape. Second circular arc portions 59B, 59B located outside the left first circular arc portion 59A and connected to the distal end side of the first circular arc portion 59A, respectively; And arc-out portions 59D, 59D for a switch for an idle switch formed outside and parallel to the first right-side arc portion 59A on the right side.

Then, these arc portions 59A, 59B,
Terminals 59E are connected to the base ends of the terminals 59C and 59D, respectively. The terminals 59E are connected to lead terminals 60 of the lid 56 by lead terminals 60 connected by means such as soldering.
6D. The resistance film 59 is a brush 55
And a potentiometer, and the brush 55 slides the brush 55 on the first arc portion 59A and the second arc portion 59B, so that the terminal 59E of the first arc portion 59A.
The electrical signal corresponding to the position of the brush 55 is extracted from the change in the resistance value between the brush 59 and the terminal 59E of the drawing arc portion 59C.

Further, the switch arc portions 59D, 59D
And the brush 55, the idle switch is switched between the closed state and the open state by the brush 55 sliding on the switch arc portion 59D with the rotation of the rotating shaft 48. Can be

Reference numeral 61 denotes an engagement projection formed as an arc-shaped projection extending in a substantially C-shape. The engagement projection 61 is formed integrally with the lid 56 with an outer diameter corresponding to the accommodation hole 47 of the sensor case 46. The cover 56 is provided so as to surround the periphery of the substrate accommodating portion 56B. When the lid 56 is mounted on the sensor case 46 of the mounting frame 42, the engagement film 39 is engaged with the peripheral wall of the circular hole 47 </ b> A of the accommodation hole 47, so that the resistance film 59 of the substrate 58
Of the rotary shaft 48 in the radial direction with respect to the brush 55.

Reference numeral 62 designates a cover 56 attached to the mounting frame 42.
The screw for attaching to the accommodation hole 47 of FIG.

The accelerator operation amount detecting device 41 according to the second embodiment has the above-described configuration, and its operation will be described next.

First, in the accelerator operation amount detecting device 41,
As illustrated in FIG. 1, when the driver steps on the accelerator pedal 3, the wire 10 is pulled and the rotation shaft 48 rotates together with the wire drum 50. At this time, the accelerator sensor 53 can detect the rotation displacement of the rotation shaft 48 as the operation amount of the accelerator pedal 3.

In the accelerator sensor 53 according to the present embodiment, the cover 56 is provided with the engagement protrusion 61, so that when the cover 56 is attached so as to cover the accommodation hole 47 of the one-side arm 44, the engagement protrusion 61 is provided. The engagement of the mating projection 61 with the peripheral wall of the accommodation hole 47 automatically positions the lid 56 with respect to the accommodation hole 47. Then, the displacement of the resistive film 59 of the substrate 58 with respect to the brush 55 of the rotating plate 54 in the radial direction of the rotating shaft 48 is restricted, so that unnecessary stress is not applied to the brush 55. This eliminates damage to the brush 55 and the resistive film 59, thereby extending the life of the brush 55 and the resistive film 59, and improving the reliability of the accelerator sensor 53.

In the embodiment, the engagement projections 39, 6
1 is formed in a substantially C-shaped arc, but the present invention is instead replaced with three engaging members which are uniformly arranged in the circumferential direction on the lid 34 as in a modified example of the throttle sensor shown in FIG. It is good also as composition provided with mating projection 39 ', 39', 39 ',
In short, any shape may be used as long as the lid can be prevented from being displaced in the radial direction with respect to the rotary plate housing hole on the casing side. This is the same for the accelerator sensor 53 described in the second embodiment.

[0076]

As described above in detail, according to the first aspect of the present invention, when the cover is assembled to the rotary plate receiving hole of the casing, the engaging projection is engaged with the rotary plate receiving hole of the casing. As a result, since the lid is automatically positioned in the radial direction with respect to the rotating plate housing hole, the lid moves only around the rotation axis until the lid is fixed to the casing. Accordingly, it is possible to prevent the brush and the resistor from being damaged at the time of the mounting operation, prolong the life of the brush and the resistor, and improve the reliability of the rotation angle detecting device.

According to the second aspect of the present invention, the engaging projection is formed with a constant length in the depth direction of the rotary plate housing hole, and when the lid is attached to the casing, the resistor comes into contact with the brush. Since it was configured to engage with the peripheral wall of the rotating plate housing hole before, for example, by setting the length of the distance from the substrate to the tip of the engagement protrusion longer than the length of the brush of the portion protruding from the casing When the lid is attached to the rotary plate receiving hole, the lid can be moved in a state in which the brush is not in contact with the resistor until the engagement protrusion engages with the peripheral wall of the rotary plate receiving hole. , Protects the brush and extends the life of the brush.

According to the third aspect of the present invention, the casing is formed of the throttle body, and the rotating shaft is formed of the valve shaft of the throttle valve. Therefore, the rotating angle detecting device can be applied to the throttle valve device of the electric throttle device. The opening degree of the throttle valve can be detected as a rotation angle.

According to a fourth aspect of the present invention, the casing comprises a mounting frame mounted on the vehicle for detecting an accelerator operation amount, and the rotating shaft is provided with a wire drum connected to an accelerator pedal of the vehicle via a wire. Since the rotation angle detection device is provided, the rotation angle detection device can be applied to the accelerator operation amount detection device of the electric throttle device, and can detect the operation amount of the accelerator pedal as the rotation angle.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an electric throttle device using a throttle sensor according to a first embodiment.

FIG. 2 is a partially broken plan view showing a state in which the throttle sensor according to the first embodiment is mounted on a throttle valve device.

FIG. 3 is a side view showing a sensor case of a throttle sensor and the like in a state where a lid is removed, as viewed from the direction of arrows III-III in FIG. 2;

FIG. 4 is a cross-sectional view showing the throttle sensor in FIG. 2;

FIG. 5 is an enlarged front view showing a sensor case of the throttle sensor.

FIG. 6 is a plan view showing the inside of a lid of the throttle sensor.

FIG. 7 is a cross-sectional view showing a state in which an engagement protrusion of the lid is engaged with the rotating plate housing hole when the lid is attached to the sensor case.

FIG. 8 is a partially broken front view showing an accelerator operation amount detecting device to which the accelerator sensor according to the second embodiment is applied.

FIG. 9 is an enlarged front view showing the sensor case with the lid removed.

FIG. 10 is a plan view showing the inside of a lid of the accelerator sensor.

FIG. 11 is a plan view similar to FIG. 6, showing a throttle sensor according to a modification.

[Explanation of symbols]

 21 Throttle body (casing) 25, 46 Sensor case 25A, 46A Shaft insertion hole 27, 47 Rotating plate housing hole 28 Valve shaft (rotating shaft) 31 Throttle sensor (rotating angle detecting device) 32, 54 Rotating plate 33, 55 Brushes 34, 56 Lids 36, 58 Substrates 37, 59 Resistive film (resistor) 39, 61, 39 'Engagement projection 42 Mounting frame (casing) 48 Rotating shaft 53 Accelerator sensor (rotating angle detecting device)

Claims (4)

[Claims] 1. A casing having a rotary plate receiving hole on an end face and having a shaft insertion hole communicating with the rotary plate receiving hole, and a rotatably provided in the shaft insertion hole of the casing, the rotary plate receiving being provided. A rotating shaft protruding into the hole, a rotating plate positioned in the rotating plate housing hole and provided integrally with the rotating shaft and having a brush made of a conductive material attached thereto, formed of a resin material, A lid body detachably provided on the casing to cover the rotary plate housing hole of the casing, and a resistor provided on the lid body and slidably contacting the brush on a surface side facing the rotary plate. In the rotation angle detecting device including a substrate, the lid includes a casing configured to restrict displacement of a resistor of the substrate with respect to a brush of the rotating plate in a radial direction of the rotating shaft. Of the rotary plate Rotation angle detecting apparatus characterized by comprising an engaging protrusion to be. 2. The method according to claim 1, wherein the engaging projection is formed to have a constant projecting length in a depth direction of the rotary plate housing hole. 2. The rotation angle detection device according to claim 1, wherein the rotation angle detection device is configured to engage with a peripheral wall of the rotation plate housing hole. 3. The rotation angle detecting device according to claim 1, wherein the casing comprises a throttle body, and the rotation shaft comprises a valve shaft of a throttle valve. 4. The casing comprises a mounting frame mounted on a vehicle for detecting an accelerator operation amount,
3. The rotation angle detection device according to claim 1, wherein the rotation shaft is provided with a wire drum connected to an accelerator pedal of the vehicle via a wire.