JPS6218736B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sensor that is attached to a throttle shaft of an internal combustion engine to detect the throttle opening, and in particular, the present invention relates to a sensor that is attached to a throttle shaft of an internal combustion engine to detect the throttle opening, and in particular, the sensor has a main body, a potentiometer attached to the main body, and a brush that comes into contact with the surface of the potentiometer. The present invention relates to a throttle opening sensor that is attachable to a throttle shaft and has a rotor that rotates relative to a main body.

The conventional throttle opening sensor of the above-mentioned type has an integral structure in which a potentiometer is fixed to the inner bottom surface of the main body consisting of a tip-shaped member formed by a side wall and a bottom wall. The shaft is made to protrude outside the main body from a bearing provided on the bottom wall of the main body, and is attached to the throttle shaft via another flange.In order to prevent the sliding surfaces of the potentiometer and brush from getting dirty, Some have a separate cover attached to seal the inside of the main body.

In this known throttle opening sensor, the protruding dimension of the sensor for mounting on the throttle shaft is large, and a large amount of space is required for mounting the sensor, which is not only undesirable for mounting on the engine, but also requires a large number of parts. The work of assembling and adjusting the position of the main body, rotor, and potentiometer accurately and phasing the throttle shaft and rotor is complicated, and the lead wire to the potentiometer must also be connected inside the main body. This has the disadvantage that the wiring work when mounting the sensor becomes complicated.

The present invention has been made in view of the problems of the prior art described above, and its objects are to provide a throttle opening with a small protruding dimension for mounting a throttle shaft, easy assembly adjustment and mounting work, and a small number of parts. The purpose of this invention is to provide a temperature sensor.

In order to achieve the above object, the present invention provides a throttle opening sensor of the above-mentioned type, the main body of which has a tip-shaped body having side walls with partially different thicknesses and a bottom wall with a substantially cylindrical bearing portion formed in the center. The member has two steps on the inner periphery of the side wall, a non-circular step on the upper end of the side wall, and the rotor has a hole in the center that engages with the throttle shaft, The side surface of the protrusion formed on the upper part of the rotor located inside the main body comes into contact with the two steps on the inner periphery of the main body to restrict rotation, and the lower part of the rotor has a substantially cylindrical shape and the lower part of the rotor has a substantially cylindrical shape. The potentiometer has a structure in which it is rotatably fitted into the bearing part, and the potentiometer is positioned and fixed by engaging with the non-circular step part on the side wall of the main body, and when the potentiometer is attached, the upper and lower surfaces of the rotor and the bearing part are connected. A disc spring inserted between the rotor and the upper end of the rotor is slightly compressed, so that the brush fixed to the upper end of the rotor comes into sliding contact with the potentiometer surface.

In a preferred embodiment of the invention, the potentiometer has a plurality of pins projecting outside the main body;
A lead wire can be connected to the pin outside the main body.

With the above-described configuration, the protrusion dimension can be significantly reduced since it can be directly attached to the throttle shaft. The main body is almost completely sealed, has good airtightness, and there is little risk of staining the sliding surfaces. Assembly is extremely easy;
Accurate positioning is possible when mounting on the throttle shaft, and there is no possibility of incorrect assembly adjustment. Furthermore, since the lead wire can be attached outside the main body, replacement work is easy.

Embodiments and drawings illustrating the present invention will be described.

The figures show an embodiment of the throttle opening sensor according to the present invention, with FIG. 1 being a sectional view and FIG. 2 being a plan view. The main body 1 is a substantially cup-shaped member made of synthetic resin, and has side walls 2 having partially different thicknesses, a central substantially cylindrical bearing portion 3, and a bottom wall 4. The side wall 2 has stepped portions 5 and 6 shown in dotted lines in FIG. 2 to limit the rotation of the rotor 7. A potentiometer 9 is engaged with a non-circular step 8 shown in FIG. 2 at the upper end of the side wall and attached by means not shown, such as a pin or a spring. The straight portion 10 of the stepped portion 8 positions the potentiometer 9.

The rotor 7 has a hole 11 into which a not-shown throttle shaft is fitted. The upper part 12 of the rotor 7 has a protruding part 13, and the side wall of the protruding part 13 comes into contact with the step parts 5 and 6 of the main body 1 to limit rotation of the rotor 7. The rotation range of the throttle shaft itself is approximately 90°, so
The rotation of the rotor 7 is also approximately 90 degrees. In order to read the potentiometer accurately, the steps 5 and 6 must be
The contact position between one of the two protrusions 13 and the protrusion 13 is determined accurately. The lower portion 14 of the rotor 7 is approximately cylindrical;
A plurality of slits 15 are formed to have almost the entire length. The lower part 14 enters a hole 16 in the bearing part 3 of the body 1.
A slope part 17 and a claw part 18 are formed at the lower end of the lower part 14, so that when the rotor 7 is inserted from above, the slope part 1
7, bends inwardly through hole 16, and passes through hole 1.
The claw portion 18 engages with the stepped portion 19 at the end of the holder 6 to perform positioning. If the throttle shaft is inserted into the hole 11 of the rotor 7, the rotor 7 will not come off upward.
A brush 20 made of an elastic plate is fixed to the upper end of the rotor 7. A disc spring 21 is inserted between the rotor 7 and the bearing part 3.

A required resistance plate and a metal plate for the output of the brush 20 are attached to the lower surface of the potentiometer 9.
Both the resistance plate and the metal plate have the required fan shape. Pins 2 electrically connected to both ends of the resistance plate and the metal plate, respectively.
2 are made to protrude from the upper surface of the potentiometer, and the lead wires 23 are respectively connected as shown in FIG. In FIG. 1, one pin 22 and a lead wire 23 are shown.

In use, the throttle shaft is inserted into the hole 11 of the rotor 7 of the throttle opening sensor in the assembled state shown in FIGS. Frictional contact can also be provided between the hole 11 and the throttle shaft, with a pin of small diameter mounted on the throttle shaft inserted into either slit 15.
You can also set it to enter. The relative position of the claw portion 18 and the step portion 19 is such that when the potentiometer 9 is attached, the brush 20 slightly compresses the disc spring 21 and a gap is formed between the claw portion 18 and the step portion 19. stipulate. Therefore, the brush 20 maintains frictional contact with the resistance plate and the metal plate on the lower surface of the potentiometer 9.

When attaching the main body 1 to a fixed part of the engine, the throttle is placed in the fully closed position, for example, and the throttle is adjusted so that one side surface of the protrusion 13 of the rotor 7 comes into contact with one of the stepped portions 5 and 6 of the main body side wall 2. By connecting the lead wire 23, it is possible to obtain the sensor output directly, and an output corresponding to the throttle opening degree can be obtained.

As clarified above, the throttle opening sensor according to the present invention is composed of a few parts: the main body 1, the rotor 7, the potentiometer 9, and the disc spring 21. The rotor 7 is centrally connected to the throttle shaft. The lower part 14 of the main body 1 has a matching hole 11, and the lower part 14 of the main body 1 is rotatably fitted into the bearing part 3 formed on the bottom wall 4 of the main body 1. Since it has a sealed structure, there is no need for a separate cover, rotor shaft, bearing, etc., and the number of parts can be minimized. Since the stepped portions 5 and 6 are provided to limit the rotation of the rotor 7, the main body 1, rotor 7, and potentiometer 9
The throttle shaft and rotor can be installed with accurate phase alignment by simply inserting the throttle shaft into the hole 11 of the rotor 7, making assembly and adjustment easy. It is. Furthermore, since the lead wires can be connected outside the main body after assembly, the wiring work is easy, and the contact between the sliding surface of the potentiometer 9 and the brush 20 is made by the force of the disc spring 21, so Uniform contact pressure can be obtained, and there is no need to provide a flange for attaching the throttle shaft, so it has the advantage that the mounting space for the sensor can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along the - line in FIG. 2 of a throttle opening sensor according to the present invention, and FIG. 2 is a plan view. 1...Main body, 2...Side wall, 3...Bearing portion, 5,
6... Step part, 7... Rotor, 9... Potentiometer, 10... Straight line part, 11, 16... Hole, 13
... protrusion, 15 ... slit, 18 ... claw,
20...brush, 21...disc spring, 22...pin, 23...lead wire.

Claims (1)

[Scope of Claims] 1. A throttle opening sensor that includes a main body, a potentiometer attached to the main body, and a rotor that has a brush that contacts the surface of the potentiometer, can be attached to a throttle shaft, and rotates relative to the main body. In,
The main body 1 is a pot-shaped member having side walls 2 having partially different thicknesses and a bottom wall 4 having a substantially cylindrical bearing portion 3 formed in the center.The inner circumference of the side wall 2 has two steps. The rotor 7 has a non-circular step 8 at the upper end of the side wall 2, and the rotor 7 has a hole 11 in the center that engages with the throttle shaft, and is located in the main body 1. The side surface of the protruding part 13 formed on the upper part 12 of the rotor abuts against the step parts 5 and 6 of the main body 1 to restrict rotation, and the lower part 14 of the rotor is approximately cylindrical and supports the bearing of the main body 1. 3, and the potentiometer 9 is engaged with the non-circular stepped portion 8 of the main body 1 to be positioned and fixed, and when the potentiometer is attached, the potentiometer 9 is attached to the upper part of the rotor 7. The disc spring 21 inserted between the lower surface of the rotor 7 and the upper end of the bearing 3 is slightly compressed so that the brush 20 fixed to the upper end of the rotor 7 comes into sliding contact with the surface of the potentiometer 9. A throttle opening sensor comprising: 2. The throttle opening sensor according to claim 1, wherein the potentiometer 9 has a plurality of pins 22 protruding outside the main body, and a lead wire can be connected to the pins 22 outside the main body.