JPH0227158Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine throttle control device which has been improved so as to improve operability by interlocking a throttle operation with a throttle operation at the time of starting.

Conventionally, for example, in small engines, the
As shown in the figure, check knob 2 of carburetor 1.
and a throttle control lever 4 linked to the throttle valve of the carburetor 1 via the governor lever 3 are arranged separately at separate positions. Therefore, when starting the engine, in addition to turning the throttle control lever 4 so that the throttle valve is opened to an appropriate opening degree for starting, the throttle control lever 4 is rotated so that the throttle valve is closed.
Furthermore, after starting the engine, the engine yoke knob 2 must be reset again, making the operation at the time of starting the engine complicated.

On the other hand, there is known an outboard motor starting assist device described in, for example, Japanese Utility Model Application Publication No. 52-80325, in which a throttle valve is opened in conjunction with a throttle knob and a throttle valve. However, in this prior art, it is necessary to provide a throttle knob and a throttle control section, respectively.
Furthermore, the structure of the link mechanism is complicated.

The present invention was developed in view of these circumstances, and while it eliminates the need for a throttle knob, it also simplifies the configuration and links the throttle to the throttle operation at the time of starting the engine. When the throttle control section is rotated so that the valve opens to the appropriate opening for starting, the throttle valve closes in conjunction with this. On the other hand, after the engine starts, the throttle valve section is turned so that the throttle valve reaches the idling opening. When the throttle valve moves to the idling opening position, the throttle valve opens again in conjunction with the throttle opening, improving operability when starting the engine. The engine speed increases to the governor setting speed by opening the throttle valve when the throttle valve is opened to the appropriate opening for starting. It is an object of the present invention to provide an engine throttle control device that can prevent such problems.

In order to achieve the above object, the engine throttle control device according to the present invention is provided with a rotatable throttle control part that opens and closes a throttle valve, and a cam that can be freely retracted and protruded from the throttle control part. A displacement member is provided so as to be able to hold the throttle valve, and a displacement member is provided so as to be freely displaceable at a position where the protruding cam abuts when the throttle control section is rotated to a position where the throttle valve has an opening degree appropriate for starting. , this displacement member is connected to a chiyoke valve via a transmission means.

The present invention will be explained in detail below with reference to the drawings.

3 to 11 show one embodiment of the throttle control device of the present invention.
The figure is a schematic diagram of the engine with the throttle control device installed, Figure 4 is a side view of the main parts showing the throttle control dial and the link for opening and closing the choke valve, and Figure 5 is the throttle control dial shown in Figure 4. A side view of the main part showing the state when the throttle valve has rotated to the appropriate opening for starting and the cam has been protruded. Figure 6 is a sectional view taken along the line A-A in Figure 4, and Figure 7 is Fig. 6 is a cross-sectional view of the cam with the cam protruding, and Fig. 8 is a cross-sectional view of the cam.
9 is a sectional view taken along the line C-C of FIG. 6, FIG. 10 is a view taken along the D direction of FIG.
Figure 1 is a side view of the throttle control dial looking at the cam side when the cam is extended.

In these figures, numeral 11 is the engine body, 12 is the carburetor, and 13 is the carburetor 1.
2 is an internal lever for opening and closing the throttle valve; 14 is a lever for opening and closing the throttle valve that is also installed in the carburetor 12; 15 is a speed control lever that is rotatably attached to a boss 16 protruding from the side of the engine body 11. It is installed,
Governor lever 18 connected by governor spring 17
The throttle lever 13 is connected to the throttle valve via the throttle lever 13. The speed control lever 15 has an arcuate groove 19, and a bolt 20 protruding from the engine body 11 side passes through the arcuate groove 19, and is rotated within the range of the arcuate groove 19, that is, from a low speed range to a high speed range. By screwing the wing nut 22 onto the protruding end of the bolt 20 and tightening the wing nut 22, the speed control lever 15 can be fixed at a predetermined position in the range from the low speed range to the high speed range. ing. Note that the means for fixing the speed control lever 15 at a predetermined position from the low speed range to the high speed range is not limited to the illustrated embodiment, and various known means may be used.

The speed control lever 15 has a speed control dial 23 integrally protruding from its rotation center for controlling the throttle valve opening. This speed control dial 23
has a knob 24 protruding in the diametrical direction on its front side, which also serves as an index indicating the rotational position from a low speed range to a high speed range. As shown in FIG. 6, this dial 23 is composed of a fixed main body 25 and a slide portion 26 that is slidable in the direction of the knob 24 on the knob 24 side, both of which are shown in FIGS. 8 and 9. They fit together using the dovetail structure shown in the figure. That is, a dovetail groove 27 is formed in the stationary side main body 25, and this dovetail groove 27
The fitting body 28 of the slide portion 26 is slidably fitted to the slide portion 26. Further, a spring chamber 29 is formed in the dovetail groove 27, and a tension spring 30 housed in this spring chamber 29 causes the slide portion 26 to
is biased in the retracting direction so that the entire slide portion 26 is accommodated within the dovetail groove 27. On the other hand, a cam 31 consisting of a tapered part and a flat part as shown in FIGS. 10 and 11 is formed on the bottom surface of the sliding part 26 on the side opposite to the spring. And slide part 2
6 in the protruding direction against the biasing force of the tension spring 30, the cam 31 is moved against the dial 2.
No. 3 protrudes from the bottom side of the flange. The slide portion 26 is configured to retract the entire slide portion 26 and lock the slide portion 26 by a click mechanism 32 consisting of a compression spring and a ball built into the fixed main body 25 and a ball engagement groove formed on the slide portion 26 side. and the protrusion of the cam 31 are respectively held. In addition, in this embodiment, the slide portion 2
The recessed holding ball engagement groove 6 may be omitted.

Further, as shown in FIGS. 3 and 4, when the speed control dial 23 is rotated so that the throttle valve has an opening degree appropriate for starting, the outer circumferential side of the dial 23 facing the cam 31 has a , first and second links 3 rotating around a fulcrum 33
4, 35 are arranged, and this second link 35
One end of the wire cable 36 is fixed to the chain lever 14 of the carburetor 12, and the other end of the wire cable 36 is fixed to the cable 36. Note that this wire cable 36 is covered with a cable cover 37. And the first
The tip of the link 34 is the outer periphery of the dial 23 and extends toward the bottom of the flange. The slide portion 26 is slid and held so that the cam 31 protrudes, and the throttle valve is opened to an appropriate opening for starting. Rotate the dial 23 so that the cam 31
presses and pushes the first link 34, the first link 34 rotates around the fulcrum, pulls the wire cable 36 through the second link 35, rotates the check lever 14, and closes the check valve. It's summery. The check valve is always biased in the open direction by a return spring (not shown), but when the cam 31 and the first link 34 are in contact, the cam 31 is pressed against and pushed by the first link 34. , it is possible to omit the stopper means for piercing the return spring.

To start the engine with this configuration, slide portion 2 of speed control dial 23
6 so that the cam 31 protrudes and maintains this state with the click mechanism 32, then rotate the dial 23 to the position where the throttle valve linked via the governor lever 18 will be opened to an appropriate opening for starting. When fixed, the protruding cam 31 pushes the first link 34, rotates the link 34, and the wire cable 3 fixed to the second link 35 is fixed.
6 and closes the chiyoke valve via the chiyoke lever 14. In this state, start the engine with the recoil starter or cell, etc. After starting the engine, turn the speed control dial 23 to the position where the throttle valve is at the idling opening (low speed side), and the cam 31 and the first The contact with the link 34 is released, and the return spring opens the check valve, while the wire cable 36 is pulled toward the check lever 14, and the first link 34 returns to its original position. Then, when the engine is idling, the slide portion 26 of the speed control dial 23 is slid to retract the cam 31. After idling, the speed control dial 23 is rotated to the high speed side where the throttle valve opens, and is fixed at a rotation position where a predetermined number of revolutions is obtained. At this time, when rotating the speed control dial 23 from the low speed side (idling side) to the high speed side, the cam 31 of the dial 23 passes through the first link 34 position.
Since the cam 31 is retracted, the first link 34 does not rotate.

In addition, in the present invention, the cam 31 may be provided on the outer peripheral side of the speed control dial 23,
Also, speed control dial 23 and lever 1
5 may be integral. moreover,
A link was used as the member displaced by the cam 31, and a wire cable was used to transmit the displacement of this link to the chiyoke valve side, but the displacement member and transmission means of the present invention are not limited to links and wire cables. .

As explained above, according to the present invention, the arrangement of the throttle knob is not required, the configuration is simplified, and the throttle valve is linked to the throttle operation when starting the engine, that is, the throttle valve is activated immediately before the engine is started. When the throttle control section is rotated to the appropriate opening, the throttle valve closes in conjunction with this. On the other hand, when the throttle control section is rotated so that the throttle valve reaches the idling opening after the engine has started, the throttle valve closes. By opening the valve in conjunction with this, it is possible to improve operability when starting the engine, and furthermore, the throttle control section is rotated so that the throttle valve returns to the idling opening after the engine has started. By opening the throttle valve when it is opened to the appropriate opening for starting, opening the throttle valve can prevent over-revving, where the engine speed increases to the governor setting speed. There is.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional engine throttle control device. Figure 1 is a vertical cross-sectional view of the entire engine in the direction perpendicular to the axis, Figure 2 is a side view showing the speed control lever, and Figure 3 is a side view of the speed control lever. 11 to 11 relate to an embodiment of the throttle control device of the present invention, FIG. 3 is a schematic diagram of the engine with the throttle control device installed, and FIG. 4 shows the throttle control dial and the link for opening and closing the choke valve. Main part side view showing 5th
The figure is a side view of the main part of the throttle control dial shown in Fig. 4 when the throttle valve is rotated to the appropriate opening for starting and the cam is protruded. 7 is a sectional view of the cam shown in FIG. 6 with the cam protruding, FIG. 8 is a sectional view taken along the line B-B of FIG. 6,
Fig. 9 is a sectional view taken along the line C-C in Fig. 6, Fig. 10 is a view taken in the direction of arrow D in Fig. 7, and Fig. 11 is a side view of the throttle control dial looking at the cam side when the cam is protruding. It is. 14...Chiyoke lever, 15...Speed control lever, 23...Speed control dial, 26...Slide section, 31...Cam, 34...Link, 36...Wire cable.

Claims (1)

[Scope of utility model registration request] A throttle control part that opens and closes the throttle valve is rotatably provided, and a cam is provided on the throttle control part so that it can be freely retracted and protruded, and the cam can be maintained in its protrusion and retraction. A displacement member is displaceably provided at a position where the protruding cam comes into contact when the throttle control section is rotated to the position where 1. A throttle control device for an engine, characterized in that the displacement member and a choke valve side are connected via a transmission means so as to be moved to close against the biasing force of a return spring.