JPH10213410A - Rotary throttle position sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize contact between connector terminals and electrodes of a resistor base to improve reliability by providing a slit between the electrodes of the resistor base. SOLUTION: A resistor base 31 is incorporated in a case 21, and electrodes 30 of the resistor base 31 are pressure-welded to the surface of connector terminals 22 insert-molded in the case 21 by elasticity of a press spring 32 of stainless steel or the like which is folded in a chevron shape for making electrical conductivity. At this time, a slit 33 provided between the electrodes 30 causes the respective electrodes 30 to be independently connected with the respective terminals 22. Therefore, the center connector terminal 22 among the connector terminals 22 protrudes inward in the case 21 so that the connector terminals 22 are not arranged in a line. However, since the adjacent electrodes 30 operate independently by the slit 33, the respective electrodes and the terminals 22 are in contact with appropriate pressure, thereby suppressing a drop in sensor output accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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. Thus, the speed of the engine is controlled.

A conventional rotary throttle position sensor is disclosed in Japanese Patent Application Laid-Open No. Hei 7-151508. Hereinafter, a conventional rotary throttle position sensor will be described with reference to the drawings. FIG. 5 is an exploded perspective view of a conventional rotary throttle position sensor, FIG. 6 is a cross-sectional view thereof, FIG. 7 is a top view of a resistor base which is the main part, FIG. 8 is a side view of a holding spring which is the main part, FIG. 9 is a diagram showing a state in which the resistor base is pressed against the connector terminal portion of the case, which is the main part, by a pressing spring.

In FIG. 5 to FIG. 9, a bottomed cylindrical case 4 has an opening, and a connector terminal 1 is built in the opening, and a connector part 2 partially projects outward. , And a mounting portion 3 is provided on the opposite side. A film-shaped resistor substrate 7 is provided on the inner peripheral surface of the opening of the case 4.
Is stored. The resistor base 7 has a structure in which a resistance pattern 5 is printed on a flexible film, and an electrode 6 electrically connected to the connector terminal 1 is provided at one end. This film-shaped resistor base 7 is housed in the case 4 and a V-shaped comb-shaped pressing spring 8 is formed corresponding to the electrode 6 of the film-shaped resistor base 7. Thereby, the electrode 6 can be elastically pressed against the connector terminal 1. Further, a rotor 11 having a comb-shaped brush 10 that is in contact with the resistance pattern 5 of the film resistor base 7 is mounted on a protrusion 9 on the outer peripheral surface at the center of the case 4. Insert a rotary throttle shaft (not shown) in the center,
A cover 13 having a central hole 12 is provided so as to be able to be coupled to the rotor 11. Here, it is assumed that the connector terminals 1 of the case 4 are integrally formed with the case 4 in a state where they are not aligned in a straight line as shown in FIG. The central connector terminal of the three connector terminals 1 protrudes inside the case 4.

[0005]

In the above-mentioned conventional structure, since the electrodes 6 of the resistance pattern 5 printed on the film-shaped resistor substrate 7 are integrated with the electrodes 6 adjacent to each other, the film-shaped resistor Due to the rigidity of the base 7 itself,
The electrode 6 of the film-shaped resistor base 7 does not come into contact with the central connector terminal, or the contact pressure decreases, and the contact between the electrode 6 of the film-shaped resistor base 7 and the connector terminal 1 becomes unstable, There was a problem that the output accuracy of the rotary throttle position sensor was reduced.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a rotary throttle position sensor with improved reliability.

[0007]

In order to achieve the above object, a rotary throttle position sensor according to the present invention has a configuration in which a slit portion is provided between electrodes of a resistor base.

According to the present invention, a rotary throttle position sensor having high reliability of connection by contact between the connector terminal and the electrode of the resistor base is obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention has a cylindrical case having a bottom and a resistance pattern provided on the inner peripheral wall of the case and having an electrode at an end of the upper surface. A film-shaped resistor base, and a connector terminal provided on the case so as to be electrically connected to an electrode provided on an upper end portion of the resistor base by contact;
A pressing spring for pressing the electrode of the resistor base against the connector terminal, a brush abutting and sliding on the resistance pattern of the resistor base are mounted, and are rotatably disposed in the case by a rotary throttle shaft. And a cover attached to the opening surface of the case and having a central opening through which a rotary throttle shaft fitted to the rotor is inserted, wherein a slit portion is provided between the electrodes of the resistor base. Since the electrodes are independent of each other, the electrodes of the film-shaped resistor base and the connector terminals do not contact each other, or the contact pressure decreases and the output accuracy of the rotary throttle position sensor decreases. Has the effect that there is no.

Hereinafter, a rotary throttle position sensor according to an embodiment of the present invention will be described 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 view showing a state where a throttle shaft is inserted through the rotary throttle position sensor, and FIG. FIG. 4 is a top view of the resistor base, and FIG. 4 is a diagram showing a state in which the resistor base is pressed against a connector terminal portion of a case, which is the main part, by a pressing spring.

In FIG. 1 to FIG. 4, reference numeral 21 denotes a cylindrical case having a bottom, which is formed of a synthetic resin having excellent heat resistance and mechanical strength, such as polybutylene terephthalate mixed with glass fibers. Several connector terminals 22 are incorporated in the case 21 by insert molding, and one end of the connector terminal 22 is connected to the case 21.
And the other end thereof protrudes into a connector portion 23 provided on a part of the outer peripheral surface of the case 21 so as to protrude outward. A ring-shaped flange 24 is formed on the outer peripheral surface of the case 21, and a mounting portion 26 having a mounting hole 25 is provided at a part of the flange 24 at a position facing each other. Further, a step 27 is provided at an intermediate portion of the inner peripheral wall of the case 21. A resin film 28 such as a polyimide film is provided in the case 21.
On one side, several resistor patterns 29 and this resistor pattern 2
At the other end of the resistor 9, a resistor base 31 having an electrode 30 formed thereon by printing or the like for contacting the connector terminal 22 and establishing electrical conduction is incorporated. That is, the resistor base 31 is incorporated so that the vertical position is regulated by the step 27 along the inner peripheral wall of the case 21 so that the resistance pattern 29 is located inside, and one end thereof is connected to the connector terminal. It is configured to be located at a portion 22 of the case 21 exposed in the case 21. The electrode 30 of the resistor base 31
The connection to the connector terminal 22 is performed by an elastic pressing spring 32 such as stainless steel bent in a V-shape. The pressing spring 32 has a flat surface on one side and a comb shape on the other side. By incorporating the pressing spring 32, the electrode 30 is connected to the connector terminal 22.
Are electrically connected to each other by the elasticity of each comb-shaped portion. At this time, a slit portion 33 is provided between each of the electrodes 30 so that conduction between each of the electrodes 30 and the connector terminal 22 is independently performed. Here, it is assumed that the connector terminals 22 of the case 21 are molded in a state where they are not aligned on a straight line, as shown in FIG. Although the center connector terminal of the connector terminals 22 protrudes inside the case 21, the slits 33 cause the electrodes 30 to move independently of the electrodes 30 adjacent to each other.
The central connector terminal and the electrode 30 are in contact with an appropriate contact pressure. Therefore, there is an effect that the output accuracy of the rotary throttle position sensor does not decrease. In the case 21, a cylindrical rotor 35 made of a synthetic resin such as polybutylene terephthalate mixed with glass fibers is incorporated. This rotor 3
5 is provided with an outwardly projecting portion 36 at an intermediate portion of the outer peripheral surface, and the tip of the projecting portion 36 comes into contact with the resistance pattern 29 of the resistor body 31 and slides by the rotation of the rotor 35. A brush 37 is attached. A cover 38 made of the same material as the case 21 is attached to an opening of the case 21 in which the resistor base 31, the holding spring 32, and the rotor 35 are incorporated. An opening 40 through which a rotary throttle shaft 39 is inserted is provided at the center of the cover 38.

The rotary throttle position sensor thus constructed is pre-assembled and press-fitted while being aligned with the rotary throttle shaft 39 near the internal combustion engine, and the rotor 35 is completely fitted on the rotary throttle shaft 39. The case 21 is joined and joined.
The case 21 is fixed to a throttle body (not shown) by using the mounting portion 26 to complete the assembly. As a result, the rotary throttle shaft 39 is rotated by depressing or releasing the accelerator, and the rotor 35 is rotated in synchronization with the rotation, and the brush 37 attached to the rotor 35 is moved by the resistor base 31. By changing the contact position with the resistor pattern 29, a voltage corresponding to the contact position is obtained at the connector terminal 22, and the change in the voltage is used as a signal to control the amount of fuel injected into the engine. Can be.

[0014]

As described above, according to the present invention, even when the connector terminals are formed integrally with the case without being aligned in a straight line, the connector terminals are provided by providing the slits between the electrodes of the resistor base. It is possible to provide a rotating throttle position sensor with improved reliability by preventing the contact between the electrode and the electrode or the unstable contact.

[Brief description of 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 sectional view showing a state where a throttle shaft is inserted through the sensor.

FIG. 3 is a top view of a resistor base as the main part.

FIG. 4 is a diagram showing a state in which a resistor base is pressed against a connector terminal portion of a case, which is a main part of the case, by a pressing spring;

FIG. 5 is an exploded perspective view of a conventional rotary throttle position sensor.

FIG. 6 is a sectional view of the same.

FIG. 7 is a top view of the resistor base, which is the main part.

FIG. 8 is a side view of a holding spring as the main part.

FIG. 9 is a view showing a state in which a resistor base is pressed against a connector terminal portion of a case, which is the main part, by a pressing spring.

[Description of Signs] 21 Case 22 Connector Terminal 29 Resistance Pattern 30 Electrode 32 Holding Spring 33 Slit 35 Rotor 37 Brush 38 Cover 39 Rotating Throttle Shaft 40 Opening

Claims (1)

[Claims] A bottomed cylindrical case; a film-shaped resistor base provided on an inner peripheral wall of the case and having a resistance pattern on an upper surface and an electrode at an end of an upper surface; and an upper surface of the resistor base A connector terminal provided in the case so as to be electrically connected by contact with an electrode provided at an end portion, a pressing spring for pressing an electrode of the resistor body against the connector terminal, and the resistor body A brush that is in contact with and slides with the resistance pattern is attached, and the rotor is rotatably disposed in the case by a rotary throttle shaft. The rotor is attached to an opening surface of the case, and is fitted to the rotor at the center. A cover having an opening through which the rotary throttle shaft to be fitted is inserted, and a slit portion provided between the electrodes of the resistor base.