JPS61250350A - Control device of throttle in engine for general use - Google Patents

Abstract

PURPOSE:To enable a device to perform fine adjustment for tension of a gevernor spring, by providing a movable hook, whose stop position can be adjusted, on a throttle control lever and suspending the governor spring to said hook. CONSTITUTION:A device. fixing a throttle control lever 1 to a gevernor shaft 2 outputting centrifugal force relating to engine rotation, relates a throttle lever 5 in a carburetor 4 to a point end 1a of said lever 1 through a rod 3. While the device, in which the above said lever 1 both swivelably supports a movable hook 6 by a rivet axis 7 and engages an adjusting screw 8 to be screwed, adapts a point end of the screw 8 to a part of the movable hook 6. And the device, swivelably supporting a governor spring lever 12 and choke control lever 13 by a supporting axis 11 to a bracket 10 provided in an opposed position to said lever 1, provides a governor spring 9 to be interposed between a tail end 12a of the governor spring lever 12 and the point end of the movable hook 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a throttle control device for a general-purpose engine using a governor device. [Technical background of the invention and its problems] Since general-purpose engines are often operated at a required constant rotational speed, the throttle is controlled in combination with a governor device. The mechanism applies a centrifugal force related to the engine speed to the throttle lever in the direction of closing the throttle valve, and also applies elasticity of a spring in the direction of opening the throttle valve. Both forces are balanced at an engine speed of , and the speed is maintained constant. The above specific rotation speed can be changed by adjusting the elasticity of the spring. Generally, a remote control cable is connected to the other end of the spring, and the set length of the spring is expanded or contracted to increase or decrease the elasticity and control the engine speed.

A specific example of the above mechanism is shown in FIG. A throttle control lever b that opens and closes a throttle valve is fixed to a governor shaft a that rotates due to centrifugal force related to engine rotation via a throttle rod C, and an output is sent to the governor shaft a from this throttle control lever b. A governor spring d is suspended to counter centrifugal force. The other end of the governor spring d is engaged with a movable hook Q on a governor spring lever f that is pivotally supported on a bracket e. The position of the movable hook Q is adjusted by an adjustment screw h. Further, the governor spring lever f is connected to a remote control cable i, and its swinging position is controlled. When the swinging position of the governor spring lever f changes, the set length of the governor spring d, that is, the elasticity, increases or decreases.
The engine speed changes from idling to high speed rotation due to the above action. The adjustment screw h is used to move the position of the movable hook q, finely adjust the set length of the governor spring d, and adjust the idling speed.

In the throttle control device configured as described above, there is an idea to provide the governor spring lever f operated by the remote control cable 1 with other functions necessary for controlling the operation of the engine. For example, if the choke pulp at start-up and the kill switch at stop are controlled by remote control cable i, driving operations will be streamlined and performance will be improved. However, in this case, the number of parts to be attached to the bracket e increases, resulting in an unreasonable amount of space. In particular, since the mechanism for finely adjusting the elasticity of the governor spring using the movable hook requires a large space including the adjustment work, it may not be possible to install other mechanical parts. Although it is possible to adjust the rotation speed by changing the effective length of the cable, it is unstable and has many disadvantages in limiting the cable stroke.

[Purpose of the invention]

In view of the above-mentioned problems, the present invention provides a general-purpose engine throttle control device that is equipped with a mechanism for finely adjusting the elasticity of a governor spring and that is capable of controlling multiple functions using a remote control cable. It is something.

[Summary of the invention]

In order to achieve the above object, the configuration of the general-purpose engine throttle control device of the present invention is such that a throttle control lever for controlling a throttle valve of a carburetor is fixed to a governor shaft, and the throttle control lever and a governor spring lever on a brake pad are connected to each other. The throttle control lever has a governor spring elastically installed therebetween, and the set length of the governor spring is adjusted by swinging the governor spring lever via a remote control cable to change the engine rotation from high speed to idling. The device is characterized in that a movable hook that can be adjusted to a stop position of 1 ull by an adjustment screw is provided on the top, and the governor spring is suspended on this movable hook.

[Embodiments of the invention]

Embodiments of the present invention are shown in FIGS. 1 and 2.

The symbol 1 is the throttle control lever.
It is fixed to a governor shaft 2 that outputs a centrifugal force that reaches m of engine rotation. A throttle lever 5 of a carburetor 4 is linked to its tip 1a via a throttle rod 3, and a throttle valve is controlled to open and close by swinging displacement of the governor shaft 2. In this case, the setting is such that centrifugal force acts in the direction of the throttle valve foot.

A swingable movable hook 6 is pivotally supported on the throttle control lever 1 by a rivet shaft 7. Further, an adjustment screw 8 is screwed onto the throttle control lever 1, and its tip is in contact with a part of the movable hook 6. By moving the adjustment screw 8 forward or backward, the position of the tip of the movable hook 6 is displaced. One end of a governor spring 9 is suspended from the tip of the movable hook 6. The elasticity of the governor spring 9 acts in the direction of opening the throttle valve.

The above are mounted directly on the engine block. On the other hand, a bracket 10 is mounted at a position facing the throttle control lever 1.

A governor spring lever 12 and a choke control lever 13 are supported by a support shaft 11 on the bracket 10 so as to be pivotable relative to each other. The governor spring lever 12 is of a bell crank type, and the other end of the governor spring 9 is engaged with the tail end 12a. The tip of the remote control cable 14 is connected to the tip 12b. The general-purpose engine has a driving operation member, and its operation causes the governor sprig lever 12 to swing through a predetermined stroke (A to D in the figure) via a remote control cable 14. As a result, the governor spring 9 expands and contracts, and the elasticity applied to the throttle control lever 1 changes.

The opening degree of the throttle valve is determined by the balance between the centrifugal force and the tension of the governor spring 9, so
When the governor spring lever 12 swings toward the A side to increase the force of the governor spring 9, the engine speed increases. The governor spring lever 12 strokes from A to D, but is set so that the inner stroke between 8 and 0 is used during normal operation. That is, the B position is the maximum rotation (for example, 3000r, p, m), and the CMLIi is the idling operation. The engine speed during idling operation is finely adjusted by displacing the movable hook 6 using the adjustment screw 8 and adjusting the set length of the governor spring 9.

The tip 13a of the choke control lever 13 is
It is connected to a choke lever of the carburetor 4 via a choke rod 15. On the other hand, the yoke control lever 1
3 is formed with an engagement piece 13b that bends toward the governor spring lever 12. Governor spring lever 1
When the lever 2 swings from the B position to the 8th position, a portion 12C of the choke control lever 13 engages with the engagement piece 13b and swings the choke control lever 13 in the direction of the arrow. This shaking closes the chalk pulp. 16 is a return spring for the choke control lever 13.

Furthermore, the bracket 10 has a magneto stop.
A stop switch 17 to which a wire is connected is provided, and its operating piece 17a is positioned so as to face the tip 12d of the governor spring lever. Governor spring lever 1
2 is swung to 04tLll, the tip 12d touches the actuating piece 1.
Press 7a to stop the engine.

The above configuration works as follows.

First, when starting the engine, operate the operation member to swing the governor spring lever 12 to the -8 position.

The choke pulp closes and the throttle valve opens fully.

By activating the starter in this way, the engine can be started easily.

After starting, the governor spring lever 12 is swung to a required position between B and 0 and held at that position, thereby controlling operation at a constant rotation speed from maximum speed to idling operation.

When the engine is stopped, the governor spring lever 12 is brought to the D position and the stop switch 17 is operated.

The rotation speed during idling operation is adjusted by finely adjusting the set length of the governor spring 9 using the adjustment screw 8 on the throttle control lever 1, as described above.

(Effects of the Invention) As described above, the throttle control device for a general-purpose engine according to the present invention is a governor device in which a fine adjustment mechanism for elasticity of a governor spring is installed on a throttle control lever, which is configured by an adjustment screw and a movable hook. , a large space can be secured on the side of the bracket that supports the governor spring lever on the opposite side.

This will cause choke pulp v to the governor spring lever.
rIrM.

Other functions such as stop switch operation can be easily added. If the governor spring lever has multiple functions in this way, the swinging stroke will increase and more parts will be placed on the bracket. If the elastic fine adjustment mechanism is installed on the governor spring lever as in the past, its swing locus takes up a large amount of space, making it difficult to arrange many parts on the bracket. Furthermore, the movement of adjustment tools such as screwdrivers becomes difficult, making it difficult to work. In this respect, the throttle control lever has a small swing stroke and a wide periphery, so there is a high degree of freedom in installing and working with the fine adjustment mechanism. In this way, the device of this invention makes the bracket side multi-functional and allows a wide variety of mechanisms to be operated with a single remote control operation, greatly contributing to simplifying operation and reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a front view of a throttle control device for a general-purpose engine showing an embodiment of the present invention, Fig. 2 is a side view of the governor spring lever as seen from arrow A in Fig. 1, and Fig. 3 is an example of a conventional throttle control device. FIG. DESCRIPTION OF SYMBOLS 1... Throttle control lever, 2... Governor shaft, 4... Carburetor, 5... Throttle lever, 6... Movable hook, 8... Adjustment screw, 9... Governor spring, 10 ···bracket,
12... Governor spring lever, 13... Choke control lever, 14... Remote control cable, 17... Stop switch.

Claims (1)

[Claims] A throttle control lever that controls the throttle valve of the carburetor is fixed to the governor shaft, a governor spring is elastically installed between the throttle control lever and the governor spring lever on the bracket, and the governor spring lever is swung via a remote control cable. In a device that changes the engine rotation from high speed to idling by adjusting the set length of the governor spring by turning the lever, a movable hook whose stop position can be adjusted with an adjustment screw is provided on the throttle control lever. A throttle control device for a general-purpose engine, characterized in that the above-mentioned governor spring is suspended.