JPH06317190A - Engine throttle valve operating device - Google Patents

Abstract

PURPOSE:To prevent deterioration of a decelerating switch by providing an engagement spring for energizing driving and driven arms in the direction in which they are engaged with a drive piece, and providing the decelerating switch which, when the drive piece is disengaged, operates to decelerate an ignition circuit. CONSTITUTION:A driving arm 21 connected to a control piece 11 and a driven arm 22 connected to a throttle valve are supported by means of a support frame in such a manner as to be rotatable relative to each other. Either the driving arm 21 or the driven arm 22 is provided with a drive piece 24 with which the driving arm 21 is engaged when rotated in the direction in which it opens the valve. Either the driving arm 21 or the driven arm 22 is provided with a decelerating switch 41 which decelerates an ignition circuit. The other arm 21 or 22 is provided with a presser for operating the decelerating switch 41. When the relative positions of the driving arm 21 and the driven arm 22 are rotated in the direction in which the drive piece 24 is disengaged, the presser operates the decelerating switch 41, which in turn decelerates the ignition circuit. The decelerating switch 41 is operated only when the control piece 11 and the throttle valve conduct different actions because of the abnormality of a control cable 15 and/or the throttle valve. Thus deterioration of the decelerating switch can be prevented by reducing the frequency at which the decelerating switch is opened and closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates mainly to a throttle valve operating device for increasing or decreasing the output of a small vehicle engine, and particularly to an operating device constructed by connecting an operator and a throttle valve with an operating cable. It is about.

[0002]

2. Description of the Related Art Generally, an engine throttle valve A is biased by a closing spring B in a direction to close an intake passage C, as shown in FIGS. It is connected to an operator E such as a grip. Therefore, the return force of the return spring B is set as small as possible so that the valve opening operation of the throttle valve A does not become heavy.

On the other hand, the operation cable D is composed of an inner cable made of steel wires in which a large number of steel wires are twisted together, and a flexible outer tube made by winding a thin strip steel. , The inner cable is connected to the movable part and the outer tube is connected to the immovable part for use. Therefore, the lubricating oil may run out due to long-term use, or freezing may occur in the winter, causing the inner rope to slide smoothly. As a result, even if the driver operates the manipulator in the closing direction in order to reduce the output of the engine, if the operation cable D has the above-mentioned obstacle, the throttle valve will stop at the opened position, and the engine output will decrease. Not doing so may cause problems.

Conventionally, in order to eliminate such a problem,
When the operator E is operated to the closed position to close the throttle valve A, the engine speed is automatically lowered to the idle speed by interrupting the ignition signal of the ignition circuit H connected to the spark plug P or by performing the thinning ignition. A deceleration switch K is provided for this purpose.

[0005]

However, in such a case, when the operator E is closed and operated, the ignition circuit H has a predetermined engine speed regardless of whether the operation cable D is abnormal or not. Since the ignition timing is retarded or decimated to ignite until the speed is reduced, the spark plug P is easily wet with fuel and misfire occurs, and the deceleration switch K is activated each time the throttle valve A is opened and closed. There is a problem that the operation frequency is high and durability is impaired.

[0006]

In order to solve the problems, the present invention rotatably supports a drive arm connected to an operator and a driven arm connected to a throttle valve by a support frame so that the drive arm and the driven arm are connected to each other. A drive element that engages when the drive arm rotates in the valve opening direction is provided in one of the above, and a deceleration switch that decelerates the ignition circuit is provided in either the drive arm or the driven arm, and the deceleration switch is provided in the other. A pusher to be operated is provided, and when the relative position between the drive arm and the driven arm is rotated in the direction in which the drive element is disengaged, the pusher operates the deceleration switch to decelerate the ignition circuit.

[0007]

When the operator of the throttle valve is operated to open, the drive arm connected to this is rotated, and the driven arm is rotated by the same angle via the driver. As a result, the operation cable connected to the driven arm opens the throttle valve according to the operation amount given to the operator. Next, if the operator closes the valve from this state, the throttle valve closes to the idle opening through the reverse process of the valve opening operation unless the operation cable is abnormal. That is, while the drive arm and the driven arm rotate in the valve closing direction, the phase between them does not change, the relationship between the pusher and the deceleration switch does not change, and the ignition circuit also continues normal ignition. To do.

On the other hand, if there is an abnormality in the operation cable or if the closing of the throttle valve is obstructed, the operating force will not be transmitted to the throttle valve even if the operator closes the valve, or even if it is transmitted, the throttle will be throttled. The valve does not close. Therefore, only the driving arm separates from the driven arm and returns to the idle position independently, and the driven arm stops at the stop position of the throttle valve. Therefore, a phase shift occurs between the drive arm and the driven arm, and the deceleration switch provided between them operates to release the pressing by the pressing element and to cause the ignition circuit to misfire.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In the figure, 10 is a throttle valve operating device for an engine using the present invention. The operating device 10 includes an operating lever 11 as an operating element and a throttle valve 12 (FIG. 3) of a carburetor connected by an operating cable 15. The operating device 10 has a support frame 27 supported by a steering handle of a vehicle, specifically, a snowmobile. An operation shaft 23 is rotatably supported by a support frame 27, the operation lever 11 and a drive arm 21 are integrally supported by the operation shaft 23, and a driven arm 22 is rotated thereon. Supported as possible. And the drive arm 2
A driver 24 for driving the driven arm 22 when the driving arm 21 rotates in the valve opening direction is provided on either one of the 1 and the driven arm 22. 17 is a drive arm 21 and a throttle valve 12
Is a return spring that urges in the closing direction of.

The drive arm 21 is made by press forming a steel plate, and one side thereof is bent upward to form a vertical portion 21a.
Is formed, and the pressing element 31 made of a leaf spring is fixed to the rivet 32 by the pressing element 31. On the other hand, a deceleration switch 41 is attached to the driven arm 22, and the switch portion faces the pressing member 31. 49 is a deceleration switch 41
The electric wire 49 is an electric wire that extends from the deceleration switch 41 toward the operation shaft 23 in the centripetal direction, goes around the electric wire 49, and is taken out to the outside of the support frame 27. Reference numeral 51 is a restraining member for fixing the electric wire 49. Further, the driven arm 22 is elastically bulged clockwise in a plan view by an engagement spring (not shown) and is in contact with the vertical portion 21a. Thus, when the drive arm 21 rotates in the valve opening direction, the driven arm 22 engages with the driver 24 and is rotated in the same direction.

Here, the deceleration switch 41 mounted on the driven arm 22 is of a normally closed type which is opened by being pressed by the leaf spring-shaped pressing element 31 provided on the driving arm 21. Thus, the deceleration switch 41 is kept open by being pressed by the leaf spring 31 while the driving element 24 formed on the driving arm 21 is in contact with the driven arm 22, so that the deceleration switch 41 does not generate a signal for deceleration. Has become.

The ignition circuit 40 is a conventionally known capacity discharge type ignition device provided with a deceleration switch 41 as a misfire means. As shown in FIG. 4, the ignition circuit 40 includes an ignition coil 43 for generating a high voltage connected to an ignition plug 42, a generator coil 44 for supplying electric power to the ignition coil 43, and a pulsar coil 45 for generating an ignition signal. Generator coil 44
An ignition capacitor 46 is interposed in a power supply circuit that supplies power from the ignition coil 43 to the ignition coil 43. Reference numeral 47 denotes a thyristor arranged in parallel with the primary side of the ignition coil 43. The thyristor 47 is applied with an ignition signal from the pulsar coil 45 via the trigger circuit 48 and temporarily discharges the electric power charged in the capacitor 46. This is a known high voltage generator that generates a high voltage secondary voltage in the ignition coil 43. In this embodiment, the deceleration switch 41 is provided in the trigger circuit 48, and the deceleration switch 41 has a function of short-circuiting the ignition signal applied from the pulsar coil 45 to the thyristor 47 and preventing the thyristor 47 from being ignited. ing. In this embodiment, the normally open type deceleration switch 41 is provided in the short circuit which short-circuits the trigger circuit 48 as means for causing the engine to misfire, but the normally closed type is provided directly in the trigger circuit 48. Of course, you can. The deceleration switch 41 is not limited to the trigger circuit 48 and may be provided in the power feeding circuit, as a matter of course.
In the mode of inserting into 8, the deceleration switch 41 need only have a small capacity.

Next, the operation of the above embodiment will be described. First, in order to increase or decrease the output of the engine, the operating lever 11 is pressed with the thumb of the driver to rotate it counterclockwise in FIG. 3 or loosen its force to return the spring 17 provided on the throttle valve 12.
Then, the return spring 17 provided on the drive arm 21 rotates it clockwise to return it to the idle position. That is, when the operation lever 11 is pushed from the position shown in FIG. 3A to the position shown in FIG. 2B to perform the valve opening operation, the drive arm 21 connected to the operation shaft 23 is rotated and the drive element 24 is used. The driven arm 22 is rotated by the same angle. The inner cable of the operation cable 15 is connected to the end of the driven arm 22, and the throttle valve 12 is opened by an amount corresponding to the rotation of the driven arm 22.

When the operating lever 11 is operated to close in this state, the throttle valve 12 returns to the initial idle opening degree (a) in the same manner as the opening operation, as long as there is no abnormality in the operating cable 15, through a process reverse to that at the opening operation. To do. That is, the driving arm 21 and the driven arm 2
The driving element 24 keeps the engaged state between the two and the pressing element 31, which is on the front surface of the deceleration switch 41, and presses the pressing element 31 to keep the circuit open. Therefore, even if the drive arm 21 is closed to the idle opening degree, the ignition circuit 40 will not be misfired by the deceleration switch 41 and the ignition timing will not be retarded.

On the other hand, when there is an abnormality such as the operation cable 15 being cut or caught in the middle, the closing of the throttle valve 12 is obstructed, and the throttle valve 12 is operated even if the operator 11 is operated to close it. Do not close to the required opening. That is, as shown in FIG. 7C, even if the drive arm 21 is rotated by the operation lever 11, the driven arm 22 stops at the original position where the throttle valve 12 was opened, and the phases of both arms are deviated. . Therefore,
The deceleration switch 41 supported by the driven arm 22 and the leaf spring 31 supported by the drive arm 21 are separated from each other, and the deceleration switch 41 is electrically connected. That is, the ignition circuit 40 will misfire.

In this embodiment, the operating device 10 including the driving arm 21 and the driven arm 22 is provided at one end of the operating cable 15, but the present invention is not limited to this. Needless to say, the above-mentioned embodiment should be understood assuming that state.

[0017]

As described above, according to the present invention, since the deceleration switch operates only when the operation cable and the throttle valve are abnormal and the operation element and the throttle valve perform different operations, the deceleration during engine operation is performed. The frequency of opening and closing the switch itself is reduced, and it is possible to avoid the problem that the deterioration of the deceleration switch is accelerated by the use of the engine. In addition, the ignition circuit does not operate to decelerate the engine unless there is an abnormality in the operation cable or throttle valve, and the ignition plug gets wet due to high-speed operation of the engine while the engine is in the misfire state, and it returns to the output operation again. This has the effect of eliminating problems such as a lack of smooth operation.

[Brief description of drawings]

FIG. 1 is a plan view of essential parts showing a throttle valve operating device according to an embodiment of the present invention.

FIG. 2 is a II-II sectional view thereof.

FIG. 3 is a plan view of a main part showing its operating state.

FIG. 4 is an example of an ignition circuit.

FIG. 5 is a plan view showing the principle configuration of a conventional device.

FIG. 6 is a VI-VI sectional view thereof.

[Explanation of symbols]

 10 ... ・ Throttle valve operating device 12 ・ ・ ・ ・ Throttle valve 15 ・ ・ ・ ・ Operation cable 21 ・ ・ ・ ・ Drive arm 22 ・ ・ ・ ・ Driven arm 24 ・ ・ ・ ・ ・ ・ Drive element 21a ・ ・ ・ Vertical Part 31 ... Leaf spring (presser)

[Procedure amendment]

[Submission date] June 15, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

The ignition circuit 40 is a conventionally known capacity discharge type ignition device provided with a deceleration switch 41 as a misfire means. As shown in FIG. 4, the ignition circuit 40 includes an ignition coil 43 for generating a high voltage connected to an ignition plug 42, a generator coil 44 for supplying electric power to the ignition coil 43, and a pulsar coil 45 for generating an ignition signal. Generator coil 44
An ignition capacitor 46 is interposed in a power supply circuit that supplies power from the ignition coil 43 to the ignition coil 43. Reference numeral 47 is a thyristor arranged in parallel with the primary side of the ignition coil 43. The thyristor 47 is applied with an ignition signal from the pulsar coil 45 via the trigger circuit 48 and temporarily discharges the electric power charged in the capacitor 46 for ignition. This is a known high voltage generator that generates a high voltage secondary voltage in the coil 43. In this embodiment, the deceleration switch 41 is provided in the trigger circuit 48, and the deceleration switch 41 has a function of short-circuiting the ignition signal applied from the pulsar coil 45 to the thyristor 47 so as not to ignite the thyristor 47. . In this embodiment, the normally open type deceleration switch 41 is provided in the short circuit which short-circuits the trigger circuit 48 as a means for causing the engine to misfire, but the normally closed type is provided directly in the trigger circuit 48. Of course, you can. The deceleration switch 41 may be provided not only in the trigger circuit 48 but also in the power supply circuit.
In the mode of inserting into 8, the deceleration switch 41 having a small capacity is sufficient.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F02P 9/00 304 A

Claims (1)

[Claims] 1. A drive arm connected to an operator and a driven arm connected to a throttle valve are rotatably supported by a support frame, and the drive arm is rotated in the valve opening direction by either the drive arm or the driven arm. A drive element that engages when moving is provided, a deceleration switch that decelerates the ignition circuit is provided in either the drive arm or the driven arm, and a pusher that activates the deceleration switch is provided in the other, and the drive arm and the driven arm are provided. A throttle valve operating device for an engine, in which a pusher operates a deceleration switch to decelerate an ignition circuit when a relative position with respect to the driver rotates in a direction in which the driver is disengaged.