JPH09199309A - Rotary throttle position sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary throttle position sensor which has high reliability by enclosing it with a cover having a projection part to abut on a rotor and restrict the rotary operation of the rotor in the opening end of a case. SOLUTION: A cover 29 formed of the same material as that of a case 11a is fitted to the opening of the case 11a into which a resistor 21, a pressing spring and a rotor 23 are assembled. In the central part of the cover 29, an opening 31 through which a rotary throttle shaft 30 is inserted is provided. The cover 29 has a first and a second projections 32, 33 toward the inside of the case 11a so as to abut on the projection part of the rotor 23 and restrict the left and right rotary operation of the rotor 23. Therefore, the excessive rotation of the rotor is prevented even when vibrations and the like are applied thereto at the time of the transportation of a rotary throttle position sensor, so that the rotor is rotated. Further, the structure of a case is simplified and formed into a plane, and reliability is enhanced.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An internal combustion engine such as a vehicle uses a throttle valve to control the amount of air flowing into the engine. When the throttle valve is opened, a large amount of air is sucked in, and when the throttle valve is closed, a small amount of air is sucked in. The speed of the engine is controlled. The throttle valve is connected to an accelerator pedal and is opened / closed by depressing the accelerator pedal.

As a conventional rotary throttle position sensor, the one disclosed in JP-A-7-151508 is known.

A conventional rotary throttle position sensor will be described below with reference to the drawings.

FIG. 5 is a bottom view in which a cover is removed so that internal components of a conventional rotary throttle position sensor can be seen, and FIG. 6 is a sectional view of the same. In the figure,
Reference numeral 1 is a case having a bottomed groove and a protrusion 2 provided from the inner wall surface toward the central portion. Reference numeral 3 is a film resistor having a resistance pattern (not shown) provided along the inner wall surface of the case 1. An external terminal 4 is electrically connected to the film resistor 3 and is connected to the outside of the case 1. Reference numeral 5 denotes a convex rotor provided so as to come into contact with the protrusion 2 inside the case 1, and has a brush 6 which is in sliding contact with the resistance pattern of the film resistor 3 at the tip of the convex shape of the rotor 5. ing.

Here, the protrusion of the rotor 5 and the protrusion 2 of the case 1 are brought into sliding contact with each other to limit the rotational movement of the rotor 5. The opening end of the case 1 is sealed with a metal cover (not shown) to form a rotary throttle position sensor.

[0007]

SUMMARY OF THE INVENTION In the above conventional configuration,
When vibration or the like is applied to the case 1, the rotor 5 collides with the protrusion 2 of the case 1, and the impact caused by the collision causes contact between the rotor 5 and the protrusion 2 to generate contact powder. There is a problem in that the signal is scattered on the body 3 and an accurate signal cannot be obtained.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a highly reliable rotary throttle position sensor.

[0009]

In order to achieve the above-mentioned object, the present invention comprises a case having an opening end which is sealed with a cover having a projection which abuts against the rotor and limits the rotational movement of the rotor. Is.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a case having a bottomed cylindrical shape, a resistor having a resistance pattern provided on a side surface of an inner wall of the case, and the resistor and the electric element. For external connection, a rotor having a brush for slidingly contacting the bottom surface of the case and rotating and slidingly contacting a resistance pattern on the resistor on the side surface of the inner wall, and an opening end of the case. The cover is sealed with a cover having a protrusion that abuts on the rotor and limits the rotational movement of the rotor.

The invention described in claim 2 is the same as claim 1.
In the invention described above, the rotor is a hollow cylinder and has a protrusion protruding toward the inside, and the protrusion of the rotor and the protrusion provided on the cover come into contact with each other to limit the rotational movement of the rotor. It is something that is done.

The invention described in claim 3 is the same as that of claim 2
In the invention described in (1), the cover is provided with first and second projections, and the projection of the rotor and the first and second projections of the cover are brought into contact with each other to limit the rotational movement of the rotor. It is a thing.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a rotary throttle position sensor according to an embodiment of the present invention, FIG. 2 is a top view showing a main part of the rotary throttle position sensor removed, FIG. 3 is a cross-sectional view of the same, and FIG. It is a back view of a cover.

In the figure, reference numeral 11 denotes a bottomed cylindrical case molded from a synthetic resin having excellent heat resistance and mechanical strength, such as polybutylene terephthalate mixed with glass fiber. Is provided with a guide portion 11a composed of a cylindrical protrusion. Further, several connector terminals 12 for external connection are incorporated in the case 11 by insert molding. One end of the connector terminal 12 is exposed inside the case 11, and the other end is the outer peripheral surface of the case 11. It projects into a part of the connector portion 13 provided so as to project outward.

A ring-shaped flange 14 is formed on the outer peripheral surface of the case 11, and a mounting portion 16 having a mounting hole 15 is provided at a portion of the flange 14 facing each other. Further, a step portion 17 is provided in the middle portion of the inner peripheral wall of the case 11.

In such a case 11, several resistance patterns 19 are provided on one side of a resin film 18 such as a polyimide film, and the other end of the resistance pattern 19 is brought into contact with the connector terminal 12 to establish electrical conduction. Connection part 20 for taking
The resistor 21 formed by printing or the like is incorporated. That is, the resistor 21 is arranged along the inner peripheral wall of the case 11,
The vertical position is regulated by the step portion 27 so that the resistance pattern 1 is formed.
9 is installed so as to come inside, and one end thereof is installed so as to be located at a portion of the connector terminal 12 exposed in the case 11.

The connecting portion 20 of the resistor 21 is connected to the connector terminal 12 by a U-shaped bent metal plate having elasticity such as stainless steel. One side is a flat plate and the other side is a pressing spring. By incorporating 22 into the connector terminal 20, the connection portion 20 is pressed against the exposed portion of the connector terminal 12.

A cylindrical rotor 23 made of synthetic resin such as polybutylene terephthalate mixed with glass fiber is incorporated in the case 11. The rotor 23 is provided with an outwardly projecting portion 24 at an intermediate portion of an outer peripheral surface thereof, and a brush 25 which is brought into contact with the resistance pattern 19 of the resistor 21 at the tip of the projecting portion 24 and slides by the rotation of the rotor 23. Is installed.

A shaft holding portion 26 having a flat surface formed by the wall thickness is formed on the inner side of the side facing the portion where the protruding portion 24 is provided. That is, the rotor 23
A fitting hole 27, which is formed by cutting a part of a circle, is formed at the center of the. Further, the shaft holding portion 26 is formed from the upper end to the lower portion of the intermediate portion, and the portion below that is formed with a perfect circular center hole 28 which is fitted into and supported by the guide portion 11a of the case 11.

Further, a cover 29 made of the same material as the case 11 is attached to the opening of the case 11 in which the resistor 21, the pressing spring 22 and the rotor 23 are incorporated. An opening 31 through which the rotary throttle shaft 30 is inserted is provided at the center of the cover 29, and the cover 31 is brought into contact with the protrusion 24 of the rotor 23 to face the inside of the case 11 so as to limit the left and right rotational movements of the rotor. It has first and second protrusions 32 and 33.

The rotary throttle position sensor thus constructed is preassembled, and is press-fitted while being aligned with the rotary throttle shaft 30 near the internal combustion engine, and the rotor 23 is attached to the rotary throttle shaft 30.
Mounting portion 16 of the case 11 in a state in which the
The case 11 is fixed to the throttle body (not shown) by using to complete the assembling.

That is, by pushing the case 11 together with the flat portion 34 of the rotary throttle shaft 30 and the shaft holding portion 26 of the rotor 23 toward the rotary throttle shaft 30 side, the rotary throttle shaft 30 is pushed to the tip. The rotor 23 is fitted and coupled in the rotational direction, and in that state, the case 11 is fixed to the throttle body by using the mounting hole 15 of the mounting portion 16 of the case 11 using a screw or the like.

The rotary throttle shaft 30 is now
It rotates by stepping on or off the accelerator, the rotor 23 rotates in synchronization with the rotation, and the brush 25 attached to the rotor 23 changes the contact position with the resistance pattern 19 of the resistor 21, Connector terminal 1
The voltage corresponding to the contact position is obtained in FIG. 2, and the amount of fuel injected into the engine can be controlled by using the fluctuation of the voltage as a signal.

When assembled as described above, the rotor 23 is the case 1
Since the center hole 28 of a perfect circle is fitted into the guide portion 11a for positioning with respect to 1, and the rotor 23 itself has strength by the shaft holding portion 26 and the protruding portion 24, the rotor 23 itself has a strength with respect to the rotary throttle shaft 30. If the central axes do not match, press-fit connection is not possible, so correct assembly will always be possible. Therefore, it is possible to prevent the rotor 23 from being damaged when it is assembled, or the rotor 23 from being inclined with respect to the case 11 to excessively press the brush 25 against the resistor 21 of the case 11 to deform it. Further, even if the rotor 23 rotates during transportation of the rotary throttle position sensor, the cover 2
The rotor 23 is restricted by the first and second protrusions 32 and 33 provided on the shaft 9, so that excessive rotation of the rotor 23 can be prevented.

The resin film 18 is used as the resistor 21.
Although the resistor pattern 19 is formed in the above description, the same applies to the case where the resistor pattern 19 is directly formed on the inner wall surface of the case 11.

[0026]

As described above, according to the present invention, the rotation of the rotor is regulated by the contact between the protruding portion of the rotor and the first and second protruding portions of the cover, thereby simplifying the structure of the case. Therefore, it is possible to provide a highly reliable rotary throttle position sensor.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a rotary throttle position sensor according to an embodiment of the present invention.

FIG. 2 is a top view of the main part with a cover removed.

FIG. 3 is a sectional view of the same.

FIG. 4 is a rear view of the cover, which is the main part of the same.

FIG. 5 is a bottom view with the cover removed to reveal the internal components of a conventional rotary throttle position sensor.

FIG. 6 is a sectional view of the same.

[Explanation of symbols]

 11 Case 12 Connector Terminal 19 Resistance Pattern 21 Resistor 23 Rotor 25 Brush 26 Shaft Holding Section 29 Cover 32 First Projection 33 Second Projection

Claims (3)

[Claims] 1. A bottomed cylindrical case, a resistor having a resistance pattern provided on a side surface of an inner wall of the case, a connector terminal for external connection electrically connected to the resistor, and A rotor having a brush that rotates while slidingly contacting the bottom surface of the case and slidingly contacts a resistance pattern on the resistor on the side surface of the inner wall, and a rotor that contacts the rotor at the opening end of the case to limit the rotation operation of the rotor A rotary throttle position sensor which is sealed with a cover having a protruding portion. 2. The rotor is a hollow cylinder and has a protrusion protruding toward the inside, and the protrusion of the rotor and a protrusion provided on the cover come into contact with each other to limit the rotational movement of the rotor. The rotary throttle position sensor according to claim 1, wherein 3. The cover is provided with first and second protrusions, and the protrusion of the rotor and the first and second protrusions of the cover are brought into contact with each other to limit the rotational movement of the rotor. The rotary throttle position sensor according to Item 2.