JPH0562802U - Throttle opening detection device for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] To prolong the life of a sensor of a detection device that detects the throttle opening of an internal combustion engine and prevent the detection signal from varying due to engine vibration. [Structure] The first lever 12 is attached to a rotary shaft 2a of an angle sensor 2.
The second lever 14 is rotatably supported and fixed to the rotation shaft 2a. A link 4 interlocking with a throttle valve of an internal combustion engine is connected to a first lever 12 via a ball joint 10. Hole 12b provided in the first lever 12
Then, the projection 14b provided on the second lever 14 is loosely fitted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a throttle opening detection device that detects the opening of a throttle valve of an internal combustion engine.

[0002]

[Prior Art]

 When controlling the ignition timing, air-fuel ratio, etc. according to the opening of the throttle valve of the internal combustion engine, a throttle opening detection device that detects the opening of the throttle valve is used. FIGS. 5 (A) and 5 (B) show an example of a conventional throttle opening degree detection device. This detection device is provided with an angle sensor in a resin case 1 and is provided outside the case. A lever 3 is attached to the rotating shaft 2a. A link 4 interlocking with a throttle valve (not shown) is connected to the rear end of the lever 3 so that the rotation of the throttle valve is transmitted to the rotary shaft of the angle sensor via the link 4 and the lever 3. .. The tip of the lever 3 serves as a pointer 3a, and the case 1 is provided with an arcuate scale display portion 5 extending along the locus of rotation of the finger 3a. When the ignition timing is controlled according to the throttle opening, the scale display section 5 displays, for example, the ignition timing corresponding to each throttle opening.

A unit 6 of a control device for controlling ignition timing and the like is also housed in the case 1, and a lead wire 7 connected to an external power source or unit is led out from the side surface of the case 1.

In the example shown in FIG. 5, the common case 1 is used for the angle sensor and other units such as the ignition timing control device, but as shown in FIG. In some cases, the source 1'is used.

In the conventional throttle opening degree detection device, as shown in FIGS. 7A and 7B, for example, a variable resistor is used as the angle sensor 2, and the angle sensor is provided in the case 1. It is arranged in the sensor storage chamber 1a, is molded with resin 8, and is fixed to the case 1. The section near the tip of the rotary shaft 2a drawn out from the case 1 has a semicircular cross section, and the semicircular part is fitted into a semicircular hole provided at the rear end of the lever 3. Has been done. A cap nut 9 is screwed to a screw portion provided at the tip of the rotary shaft 2a, and the lever 3 is fixed to the rotary shaft 2a by the cap nut. A link 4 that interlocks with the throttle valve is connected to the lever 3 via a ball joint 10.

[0006]

[Problems to be solved by the device]

 In the conventional throttle opening degree detection device, since the vibration of the internal combustion engine is directly transmitted to the rotary shaft 2a of the angle sensor via the link 4 and the lever 3, it is possible to avoid the constant vibration of the movable part of the angle sensor. There wasn't. When slight vibration is applied to the moving part of the angle sensor, the moving part of the angle sensor is constantly vibrating, which causes problems that the life of the angle sensor is shortened and the output signal of the sensor fluctuates. It was The object of the present invention is to suppress the vibration applied to the movable part of the angle sensor, prevent the fluctuation of the output signal of the sensor, and extend the life of the sensor. To provide.

[0007]

[Means for Solving the Problems]

 A throttle opening detection device for an internal combustion engine according to the present invention includes an axis of rotation and a movable part that is displaced according to the rotation of the axis of rotation, and an angle sensor whose electric variable changes with the displacement of the movable part. A first lever that is rotatably supported by the rotation shaft of the angle sensor and that is connected to a link that interlocks with the throttle valve of the internal combustion engine; and a second lever that is fixed to the rotation shaft. ing. A hole is provided in one of the first lever and the second lever, and a projection loosely fitted in the hole is provided in the other, and the first lever and the second lever are fitted with each other by fitting the holes. And the second lever are connected. Instead of dividing the lever into two parts as described above, the rotation axis of the angle sensor is divided into a first part fixed to the movable part and a second part connected to the first part via an elastic member. The drive lever may be attached to the second portion.

[0008]

[Action]

 As described above, the first lever connected to the link that interlocks with the throttle valve and the second lever fixed to the rotation shaft of the angle sensor are provided, and one of the levers has a hole and the other has the hole. By providing the loosely fitted protrusion, the slight vibration transmitted from the internal combustion engine side via the link can be absorbed by the play gap formed between the hole and the protrusion. Therefore, it is possible to suppress the transmission of microvibration to the movable portion of the angle sensor, and prevent the output signal of the angle sensor from fluctuating and the life of the angle sensor from being shortened. Also, when the rotation shaft of the angle sensor is divided into a first portion and a second portion and an elastic member is interposed between the first portion and the second portion, the elastic member causes vibration. Since it can absorb, it is possible to obtain the same effect as described above.

[0009]

【Example】

 1 (A) and 1 (B) show an embodiment of the present invention. In this embodiment, an angle sensor including a variable resistor is provided in an angle sensor housing chamber 1a provided in a resin case 1. 2 is stored, and the angle sensor 2 is fixed to the case 1 by the resin 8 cast in the sensor storage chamber 1a.

A metal collar 11 is fitted to the boss portion 1b of the case 1, and the collar 11 is fixed to the case 1 by adhesion or the like. The rotation shaft 2a of the angle sensor 2 is rotatably penetrated through the color sensor 11 and led out to the outside. A large diameter portion 11a and a small diameter portion 11b are provided on the outer end portion of the collar 11, and the outer circumference of the small diameter portion 11b is provided on the first lever 12 shown in FIGS. 3 (A) and 3 (B). The formed hole 12a is fitted. An E-ring (circlip) 13 is fitted in a groove provided at the end of the small-diameter portion 11b of the collar 11, and the E-ring prevents the first lever 12 from coming off. The first lever 12 is rotatable with respect to the collar 11, and a link 4 interlocking with a throttle valve (not shown) is connected to an end of the first lever via a ball joint 10. The ball joint 10 includes a ball 10 a fixed to the first lever 12 and a ball receiver 10 b fixed to the end of the link 4. The first lever 12 is also provided with a hole 12b into which a protrusion provided on a second lever described later is loosely fitted.

As shown in FIGS. 2A and 2B, the second lever 14 is provided with a non-circular (semi-circular in the illustrated example) hole 14 a in the middle thereof. The end of the rotary shaft 2a of the angle sensor 2 is fitted to 14a. The end of the rotary shaft 2a has the same cross-sectional shape as the hole 14a, and the rotation shaft 2a and the second lever 14 are prevented from rotating by fitting the rotary shaft 2a and the hole 14a. There is. A male screw portion is provided at the tip of the rotary shaft 2a, and a cap nut 9 is screwed to the male screw portion. By tightening the cap nut 9, the second lever 14 is fixed to the rotary shaft 2a. There is. In the illustrated example, a spring washer 15 is inserted between the cap nut 9 and the second lever 14. A protrusion 14b bent toward the first lever 12 is provided at the rear end of the second lever 14, and the protrusion 14b is loosely fitted in the hole 12b of the first lever 12. With the protrusion 14b fitted in the hole 12b as described above, the longitudinal direction of the first lever 12 and the longitudinal direction of the second lever 14 coincide with each other. A pointer 14c is formed at the tip of the second lever 14, and the case 1 is provided with an arc-shaped scale display portion 5 extending along the locus of rotation of the pointer 14c.

In the above embodiment, 2A shown in FIG. 1B is a lead wire derived from the angle sensor 2, and 1c is a mounting portion projecting from a plurality of side walls of the case 1. A mounting hole 1d is provided penetrating each mounting portion 1c.

When the protrusion 14b of the second lever 14 is loosely fitted in the hole 12b of the first lever 12 as in the above-described embodiment, the vibration transmitted from the internal combustion engine side through the link 4 is generated in the hole 12b. It can be absorbed by the gap formed between the protrusion 14b. Therefore, it is possible to suppress the vibration from being transmitted to the rotary shaft of the angle sensor 2, and it is possible to prevent the vibration of the engine from shortening the life of the sliding contact portion of the angle sensor or varying the detection output signal. Can be prevented.

In the above embodiment, if the gap formed between the hole 12b and the protrusion 14b is set to be too large, the detection accuracy of the throttle opening will be lowered, so the gap is set to the minimum necessary. Is preferred.

In the above embodiment, a cushioning material made of an elastic material may be interposed between the hole 12b and the protrusion 14b loosely fitted in the hole. For example, a rubber-made cushioning material is fitted into the hole 12b, and a protrusion 14b is fitted into a hole formed by penetrating the center portion of the cushioning material, and the first lever 12 and the second lever 12 are inserted through the cushioning material. Alternatively, the lever 14 may be connected. In this case, there may be no clearance between the hole of the cushioning material and the protrusion 14.

In the above embodiment, the first lever 12 is provided with the hole 12b and the second lever 14 is provided with the protrusion 14b. However, in order to achieve the object of the present invention, both levers are raised. It suffices that the second lever 14 and the hole be connected by a relatively loose fit, and a hole may be provided in the second lever 14 and a protrusion that is relatively loosely fitted in the hole may be provided on the first lever 12 side. Good.

4 (A) and 4 (B) show an angle sensor used in another embodiment of the present invention. In this embodiment, the rotary shaft 2a of the angle sensor 2 serves as a movable portion of the sensor. The first portion 2a1 is attached and the second portion 2a2 is connected to the first portion 2a1 via the elastic member 16. The elastic member 16 has a shape in which prismatic protrusions 16b and 16c are projected from both sides of a disk-shaped main body portion 16a, and the protrusions 16b and 16c are respectively the first portion 2a1 and the second portion of the rotating shaft. It is fitted in the recess provided in 2a2. The elastic member 16 is fixed to the first portion 2a1 and the second portion 2a2 by adhesion.

When the angle sensor shown in FIG. 4 is used, a lever is attached to the second portion 2a2 of the rotary shaft 2a in the same structure as the conventional one shown in FIG. It may be connected to the lever.

When the angle sensor shown in FIG. 4 is used, the elastic member 16 inserted in the middle of the rotary shaft 2a absorbs the vibration and suppresses the vibration from being transmitted to the movable portion of the angle sensor. Therefore, the same effect as that of the embodiment of FIG. 1 can be obtained.

In the above-described embodiment, the variable resistor (potentiometer) is used as the angle sensor. However, the angle sensor has a movable part that is displaced according to the rotation of the rotating shaft, so that an electrical variable (resistance, reactance) is generated. , Impedance, current, voltage, etc.), and variable capacitors, differential transformers, etc. can be used as the angle sensor.

[0021]

[Effect of the device]

 As described above, according to the first aspect of the present invention, the lever attached to the rotary shaft of the angle sensor is divided into the first lever and the second lever, and both levers are loosely fitted into the hole. Since they are coupled by the mating projections, the vibrations transmitted from the internal combustion engine side can be absorbed by the gap formed between the holes and the projections. Therefore, it is possible to prevent the vibration from being transmitted to the movable part of the angle sensor, and to prevent the life of the angle sensor from being shortened and the detection signal from fluctuating due to the vibration of the internal combustion engine. There is.

According to the second aspect of the invention, the rotation shaft of the angle sensor is divided into the first portion and the second portion, and the elastic member is interposed between the two portions. The generated vibration can be absorbed by the elastic member. Therefore, it is possible to prevent the vibration from being transmitted to the movable portion of the angle sensor, extend the life of the angle sensor, and prevent the detection signal from fluctuating due to the vibration of the engine.

[Brief description of drawings]

FIG. 1A is a plan view showing a main part of an embodiment of the present invention,
(B) is a cross-sectional view in which a main portion is longitudinally cross-sectioned when the same embodiment is viewed from the front.

2A and 2B are a plan view and a front view of a second lever used in the embodiment of FIG. 1, respectively.

3A and 3B are a plan view and a front view of a first lever used in the embodiment of FIG. 1, respectively.

FIG. 4A is a front view of an angle sensor used in another embodiment of the present invention, and FIG. 4B is a perspective view showing a rotary shaft portion of the angle sensor of FIG.

5A and 5B are respectively a plan view and a front view showing an example of a conventional throttle opening degree detection device.

FIG. 6 is a plan view showing another example of a conventional throttle opening degree detection device.

FIG. 7A is a plan view showing in detail a structure of a main part of a conventional throttle opening degree detection device, and FIG. 7B is a cross-sectional view of the main part of the detection device as viewed from the front. ..

[Explanation of symbols]

1 ... Case, 2 ... Angle sensor, 2a ... Rotation axis, 2a1 ... 1st part, 2a2 ... 2nd part, 4 ... Link, 12 ... 1st
Lever, 12b ... hole, 14 ... second lever, 14b ...
Protrusion, 16 ... Elastic member.

Claims (2)

[Scope of utility model registration request] 1. An angle sensor having a rotating shaft and a movable portion that is displaced according to the rotation of the rotating shaft, and an electric variable that changes in accordance with the displacement of the moving portion, and a rotating shaft of the angle sensor. A first lever that is rotatably supported with respect to the first lever and that is connected to a link that interlocks with a throttle valve of an internal combustion engine; and a second lever that is fixed to the rotating shaft. A hole is provided in one of the first lever and the second lever, and a protrusion loosely fitted in the hole is provided in the other, and the first lever and the second lever are fitted by fitting the hole and the protrusion.
A throttle opening detection device for an internal combustion engine, characterized in that it is connected to a lever. 2. An angle sensor comprising a rotating shaft and a movable portion that is displaced according to the rotation of the rotating shaft, and an electric variable that changes with the displacement of the movable portion; and a rotating shaft of the angle sensor. A lever that is fixed and that is connected to a link that interlocks with a throttle valve of the internal combustion engine; and the rotating shaft includes a first portion fixed to the movable portion and an elastic member on the first portion. A throttle opening degree detection device for an internal combustion engine, comprising: a second portion connected via a lever, wherein the lever is fixed to the second portion of the rotary shaft.