JPH07280505A - Throttle valve opening sensor - Google Patents

Abstract

PURPOSE:To provide a throttle valve opening sensor wherein rotor eccentricity and setting angle positioning precision is heightened and a rotor can be fitted in a stable state. CONSTITUTION:A throttle valve sensor is provided with a board 5 having an opening detection part of a throttle valve, a rotor shaft 10 provided to be interlocked with the throttle valve, a rotor 30 attached to the rotor shaft 10 and provided with a slide contact 33 for sliding on the opening detection part, and a housing 35 housing the board 5 and rotatably supporting the rotor shaft 10. Constitution is performed in that the rotor shaft 10 has a cross-like expanding slot on the edge part thereof and is provided with a resilient locking part 15 whose circumference is square, the rotor 30 is equipped with a square locking hole 31 which can be engaged with the resilient locking part 15, the resilient locking part 15 is engaged with the locking hole 31, resiliently brought into contact therewith and fixed thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve opening sensor for detecting the opening of a throttle valve of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a throttle valve opening sensor is
For example, as indicated by reference numeral 51 in FIG. 6, a substrate 52 having a throttle valve opening detection unit (not shown), a rotor shaft 53 provided so as to be interlocked with the throttle valve,
A rotor 55 provided with a sliding contact 54 attached to the rotor shaft 53 and sliding on the opening degree detection unit, and a bearing 56 for accommodating the substrate 52 and rotatably supporting the rotor shaft 53.
And a housing 57 having

Such a throttle valve opening sensor 5
1, the rotor shaft 53 is generally made of a metal material,
The rotor 55 is made of a metal plate material or a synthetic resin plate material, and the tip portion of the rotor shaft 53 is fitted into an oval-shaped hole for attachment provided at the rotation center of the rotor 55, and the tip portion is spun by caulking. Both were fixed by processing.

[0004]

However, in the throttle valve opening sensor having such a conventional structure, the X, B between the rotor and the rotor shaft during the spinning caulking process is increased.
There was a risk that the Y direction could not be regulated and the eccentricity and the rotor mounting angle position were displaced. Therefore, there is a problem that the contact position between the sliding contact attached to the rotor and the opening degree detection unit of the substrate is displaced, and the detection output varies, which lowers the detection accuracy.

Further, during spinning caulking of the rotor, the rotor may be deformed, and the deformation changes the contact load on the opening detecting portion of the sliding contact,
There is a problem that the detection output changes due to poor contact, and the opening degree detection unit is unevenly worn to reduce durability.

The present invention has been made to solve the above problems, and an object of the present invention is to improve the eccentricity of the rotor and the positioning accuracy of the mounting angle and to mount the rotor in a stable state. It is intended to provide a throttle valve opening sensor.

[0007]

The present invention has been made to achieve the above object, and a throttle valve opening sensor of the present invention comprises a substrate having an opening detecting portion of the throttle valve and the throttle valve. A rotor shaft provided so as to be interlocked with the rotor, a rotor having a sliding contact attached to the rotor shaft and sliding on the opening degree detection unit, the substrate can be accommodated and the rotor shaft can be rotated. A throttle valve opening sensor including a housing supporting the rotor, the rotor shaft having a cross-shaped split groove at a tip end thereof, and an elastic locking portion having a square outer periphery, wherein the rotor is It is characterized in that it has a rectangular locking hole that can be fitted with the elastic locking portion, and that the elastic locking portion is fitted into the locking hole and is elastically abutted and fixed.

Further, the housing has a rotor seat for rotatably supporting one surface of the rotor, and the rotor shaft is biased in one axial direction so that the rotor moves in the rotor seat direction. It is characterized in that it is slidably in close contact.

[0009]

The present invention is configured as described above, and the elastic locking portion of the rotor shaft has elasticity in the directions orthogonal to the rectangular outer peripheral surface due to the cross-shaped split grooves.

By fitting the elastic locking portion into the locking hole of the rotor, both are fitted and elastically contacted with each other, and the axis of the rotor shaft and the rotation center of the rotor are set concentrically. Also, due to the rectangular outer peripheral surface of the elastic locking portion and the rectangular locking hole,
Rotor mounting angle positioning is performed.

Further, the rotor shaft biased in one direction is
The rotor is brought into close contact with the rotor seat through the protrusion of the elastic locking portion to accurately define the axial position of the rotor.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the drawing, a throttle valve opening sensor indicated by reference numeral 1 is a substrate 5 having an opening detecting portion (not shown), a rotor shaft 10, and a slider mounted on the rotor shaft 10 and sliding on the opening detecting portion. Rotor 30 with sliding contact 33
And a housing 35 that houses the substrate 5 and rotatably supports the rotor 30 and has a rotor seat 38.
The rotor shaft 10 is provided with an elastic locking portion 15 having a square outer periphery, and the rotor 30 is provided with a rectangular locking hole 31.

In the embodiment, the substrate 5 is made of a ceramic plate material, and one surface (the upper surface side in FIG. 1) of the substrate 5 is provided with a throttle valve opening detecting portion composed of a printing pattern. A fitting hole 6 is formed in the center of the substrate 5 to fit the outer periphery of a rotor seat 38, which will be described later, to position the center of the opening degree detection unit.

The rotor shaft 10 is made of a synthetic resin material,
A connecting portion 12 that can be connected to the throttle valve and an elastic locking portion 15 at the tip end portion are formed. The elastic locking portion 15 extends in the axial direction of the rotor shaft 10 and
It is formed by including four locking pieces 20 facing each other in parallel through the split grooves 17a and 17b intersecting in a cross shape.

The four locking pieces 20 each have abutting surfaces 21 and 25 on the outer peripheral side, and the abutting surfaces 21 and 25 are in a direction orthogonal to the respective surfaces due to the elasticity of the material itself. It is formed with elastic force. The contour line formed by each of the contact surfaces 21 and 25 is formed in a rectangular shape, and is slightly larger than the outer circumference of a rectangular locking hole 31 described later.
Each of the four locking pieces 20 has a protrusion 22 protruding vertically in FIG. 4 and a tapered taper surface 23 at the tip of the contact surface 21, and the tip of the contact surface 25. Has a tapered taper surface 26.

The rotor 30 is formed of a synthetic resin material in a flat plate shape, and has an elastic locking portion 15 at its rotation center.
Locking hole 31 for mounting the rotor shaft 10 that elastically fits with
Has been drilled. Then, at a predetermined position of the rotor 30, a sliding contact point 3 that elastically contacts and slides on the opening degree detection unit.
3, 33 are fixed.

The housing 35 is made of a synthetic resin material and contains a substrate housing chamber 36 for housing the substrate 5 and the rotor 30.
And a bearing 39 that rotatably supports the rotor shaft 10. In the substrate housing chamber 36, a substrate mounting portion 37 for mounting and supporting the substrate 5 is formed, and in the central portion of the substrate housing chamber 36, a substrate is projected in a cylindrical shape.
A rotor seat 38 that supports the lower surface (lower surface side in FIGS. 1 and 2) of the rotor 30 to be rotatable and slidable is formed.

The above-mentioned rotor shaft 10 is fitted in the bearing portion 39 of the housing 35 and is rotatably supported.
Elastic locking portion 1 of rotor shaft 10 protruding from rotor seat 38
The locking hole 31 of the rotor 30 is fitted into the tip of the rotor 5, and the rotor 30 is attached to the rotor shaft 10. And
A return spring 40 is interposed between the flange portion 13 of the rotor shaft 10 and the housing 35.

The return spring 40 has torsion spring elasticity and compression spring elasticity, and urges the rotor shaft 10 to rotate in the returning direction and urges the rotor shaft 10 downward in FIG. As a result, the lower surface of the rotor 30 is slidably in contact with the rotor seat 38 via the rotor shaft 10.

A connector portion 42 is formed so as to extend to the side of the housing 35.
A plurality of connector terminals 4 electrically connected to the opening detector
3 is provided. Further, reference numeral 45 is a cover,
The substrate 5 is pressed onto the substrate stationary portion 37 via the packing 46 having rubber-like elasticity, and the opening of the substrate housing chamber 36 is sealed.

Here, to mount the rotor 30 on the rotor shaft 10, the rotor shaft 10 is mounted on the bearing portion 39 of the housing 35.
Is fitted to the elastic locking portion 15 of the rotor shaft 10 protruding from the rotor seat 38 so that the locking hole 31 of the rotor 30 is fitted to a predetermined mounting position.

At this time, the taper surface 23 of each locking piece 20,
26 is initially pressed against the peripheral edge of the locking hole 31 and is elastically compressed. Then, as the projection 22 passes through the locking hole 31, each contact surface 21 expands due to the elastic force of the locking piece 20, and elastically contacts the peripheral edge of the locking hole 31. On the other hand, when the tapered surface 26 passes through the locking hole 31, the contact surface 25 elastically contacts the other peripheral edge of the locking hole 31.

As a result, the axis of the rotor shaft 10 and the center of rotation of the rotor 30 become concentric, and the rotor 30
The mounting angle of is positioned. Therefore, the center of rotation between the sliding contact 33 attached to the rotor 30 and the opening degree detecting portion of the substrate 5 and the relative attachment angle are accurately set.

On the other hand, each of the protrusions 22 engages with the upper surface of the rotor 30 (upper surface of FIGS. 1 and 2), and the rotor 30 is urged downward by the return spring 40 in the axial direction.
8 up close. As a result, the position of the rotor 30 in the axial direction is defined, the distance between the rotor 30 and the substrate 5 is accurately maintained, and the contact pressure of the sliding contact 33 to the opening degree detection unit is maintained constant. .

The present invention is not limited to the above description and the illustrated examples, and its embodiment can be modified without departing from the technical idea of the present invention. For example, the outer periphery of the elastic locking portion 15 may be a square or rectangular isotropic shape. Further, a protrusion may be provided on the contact surface 26 side.

[0027]

As described above, according to the throttle valve opening sensor of the present invention, the rotor shaft is provided with the cross-shaped split groove and the outer periphery is provided with the elastic locking portion, and the rotor is locked with the rectangular shape. Since the hole is provided and the elastic locking portion and the locking hole are fitted and elastically abutted and fixed, the eccentricity of the rotor can be prevented and the mounting angular position can be accurately positioned. Therefore, it is possible to prevent the detection output of the throttle valve opening sensor from fluctuating and improve the detection accuracy.

Further, the rotor can be mounted on the rotor shaft in a stable shape, and as in the conventional example, the deformation of the rotor that occurs when the rotor is stuck can be avoided, and fluctuations in the detected output or deviations that occur accompanying it can be avoided. The effect of preventing deterioration of durability due to wear is exhibited.

[Brief description of drawings]

FIG. 1 is a side sectional view of a throttle valve opening sensor according to an embodiment of the present invention.

FIG. 2 is also an enlarged cross-sectional view of a main part.

FIG. 3 is also an enlarged plan view of a main part.

FIG. 4 is a perspective view of a rotor shaft.

FIG. 5 is a perspective view of a rotor.

FIG. 6 is a side sectional view showing an example of a conventional throttle valve opening sensor.

[Explanation of symbols]

 1 Throttle valve opening sensor 5 Substrate 10 Rotor shaft 15 Elastic locking part 20 Locking piece 30 Rotor 31 Locking hole 35 Housing 38 Rotor seat 40 Return spring

Claims (2)

[Claims] 1. A substrate having a throttle valve opening detection unit, a rotor shaft provided so as to be interlocked with the throttle valve, and a slide attached to the rotor shaft and sliding on the opening detection unit. A throttle valve opening sensor, comprising: a rotor having a contact; and a housing that accommodates the substrate and rotatably supports the rotor shaft, wherein the rotor shaft has a cross-shaped split at its tip. A groove is provided and an outer periphery is provided with a rectangular elastic locking portion, the rotor is provided with a rectangular locking hole that can be fitted with the elastic locking portion, and the elastic locking portion is fitted into the locking hole. The throttle valve opening sensor is characterized in that it is elastically abutted and fixed. 2. The throttle valve opening sensor according to claim 1, wherein the housing has a rotor seat that rotatably supports one surface of the rotor, and the rotor shaft has one axial direction. A throttle valve opening sensor, which is biased in a direction to closely contact the rotor slidably in the rotor seat direction.