JPS5836175B2 - Carburetor valve opening detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve opening detection device for a carburetor, and more particularly to a valve opening detection device for a carburetor having a structure suitable for reliable operation.

Recently, I detected the valve opening of a carburetor for an internal combustion engine, and
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A conventional valve opening detection device for a carburetor used for purposes such as 4-car, 11-worker, and Z-boot switches has a configuration shown in FIG.

In FIG. 1, 1 is the carburetor, 2 is the throttle valve shaft of the throttle valve 3 of the carburetor 1, 4 is the arm fixed to the throttle valve shaft 2, and 5 is the position of one end of the interlocking piece 6 that interlocks with the arm 4. An adjustment screw 7 is screwed to the arm 4 for adjusting the position, and 7 is a fixed shaft fixed to a bracket 8 fixed to the carburetor 1. are rotatably matched.

As shown in FIG. 2, a clockwise force is applied to the interlocking piece 6 by a torsion spring 9 wound around the outer periphery of the fixed shaft 7.

Therefore, when the throttle valve 3 is gradually opened, the arm 4 fixed to the throttle valve shaft 2 rotates counterclockwise, and the interlocking piece 6 is rotated about the fixed shaft 7 by the force of the spring 9. When the microswitch 10 is rotated clockwise and rotated by a predetermined amount, the microswitch 10 is switched from off to on or from on to off.

Thereby, the opening of the throttle valve 3 can be detected as the on or off state of the microswitch 10.

Conversely, when the throttle valve 3 is closed from a certain opening position, the closing moment of the throttle valve 3 is large, so the interlocking piece 6 resists the force of the spring 9.
is rotated counterclockwise, and when the microswitch 10 is rotated by a predetermined amount, the microswitch 10 is switched from on to off or from off to on.

By the way, when opening the throttle valve 3, the force of the spring 9 is biased in a direction to rotate the interlocking piece 6 clockwise, so the greater the force of the spring 9, the more reliably the interlocking piece 6 will rotate clockwise. However, when closing the throttle valve 3, the greater the force of the spring 9, the smaller the apparent closing torque of the throttle valve 3 becomes.In extreme cases, the throttle valve 3 may not return to its idle opening position. There may be cases where this is not the case.

Therefore, the force of the spring 9 needs to be the minimum force that can operate the microswitch 10.

However, in the conventional valve opening detection device described above, when a vibration or repeated durability test is performed, the frictional resistance between the a side of the fixed shaft 7 and the b side of the interlocking piece 6 shown in FIG. gradually increases, and the generated abrasion powder is not discharged but adheres to the play gap between the fixed shaft 7 and the interlocking piece 6, and finally the force of the spring 9 is unable to rotate the interlocking piece 6. This may result in malfunction.

In addition, since one end of the interlocking piece 6 is loosely engaged with the fixed shaft 7 to serve as the rotation center of the interlocking piece 6, the interlocking piece 6 tends to swing vertically due to longitudinal vibration, increasing wear on the loose fitting part and causing malfunction. encourage people to wake up.

Furthermore, there is also a drawback that the microswitch 10 may turn on or off even though the interlocking piece 6 does not rotate by a predetermined amount due to vibration.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a valve open detection device for a carburetor that always operates reliably.

The feature of the present invention is that the interlocking piece is loosely fitted around the center of gravity on the fixed shaft, and the center of rotation is around the center of gravity of the interlocking piece.

Another feature of the present invention is that, in order to limit the movement of the interlocking piece in the thrust direction, a rotating member is freely rotatably provided on the fixed shaft on the opposite side of the interlocking piece to the side on which the spring is wound.

The present invention will be explained in detail below using the embodiments shown in FIGS. 3 and 4.

FIG. 3 is a structural diagram showing one embodiment of the valve opening degree detection device of the present invention, and FIG. 4 is a sectional view taken along the line BB in FIG. 3.

In FIG. 3, the same parts as in FIG. 1 are indicated by the same symbols,
The explanation will be omitted.

The difference from FIG. 1 is that a fixed shaft 7a is provided near the center of gravity of the interlocking piece 6a, and the interlocking piece 6a is rotatably engaged with the fixed shaft 7a. As shown, a rotating member, such as an E IJ ring 11, which serves as a stopper for the movement of the interlocking piece 6a in the thrust direction is loosely engaged.

Reference numeral 9 in FIG. 4 is a spring that applies a clockwise force to the interlocking piece 6a as in FIG. 1.

According to the embodiment of the present invention, even if the rotating member 11 and the interlocking piece 6a come into contact, the rotating member 11 rotates together with the interlocking piece 6a, so the frictional resistance is lower than in the case of FIG. Furthermore, since the generated wear powder is scattered through the rotating member 11, the wear powder is less likely to adhere to the loose gap between the fixed shaft 7a and the interlocking piece 6a, and the spring Even if the force 9 is small, the interlocking piece 6a rotates and the microswitch 10 can be reliably operated when the opening of the throttle valve 2 reaches a predetermined value.

Moreover, since the rotation center of the interlocking piece 6a is located near the center of gravity of the interlocking piece 6a, the rotational moment generated from the rotation center of the interlocking piece 6a to the interlocking piece 6a on the microswitch 10 side, and the rotational moment generated from the rotation center of the interlocking piece 6a to the throttle valve 3 The rotational moment generated in the side interlocking piece 6a is almost balanced, and even if vertical vibration is applied to the interlocking piece 6a, the vertical vibration of the interlocking piece 6a is suppressed to a minimum. In addition, the microswitch 10 is prevented from malfunctioning due to vibration.

Therefore, the valve opening detection device always operates reliably.

As described above, the present invention has the remarkable effect of providing a valve opening detection device that always operates reliably.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional valve opening detection device, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a configuration diagram showing an embodiment of the valve opening detection device of the present invention. A certain figure, FIG. 4 is a BB sectional view of FIG. Explanation of symbols, 2... Throttle valve shaft, 3... Throttle valve, 4... Arm, 6a... Interlocking piece,
7a...Fixed shaft, 9...Spring, 10.
...Micro switch, 11...Rotating member.

Claims (1)

[Scope of Claims] 1. An interlocking piece rotatably engaged with a fixed shaft fixed to a carburetor, and a torsion spring wound around the fixed shaft and biased to rotate the interlocking piece in one direction. , an arm fixed to the valve shaft of the carburetor and interlocking with the interlocking piece so as to restrict or permit rotational displacement of the interlocking piece; and a switch operated by the rotational displacement of the interlocking piece. 1. A valve opening change detection device for a carburetor, characterized in that a vicinity of the center of gravity of the interlocking piece is rotatably engaged with the fixed shaft. 2. A rotating member for restricting movement of the interlocking piece in the thrust direction is freely rotatably provided on the fixed shaft on the opposite side of the interlocking piece where the torsion spring is located. A valve opening detection device for a vaporizer according to scope 1.