JPH0439399Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an engine throttle control device in which a throttle valve and a choke valve are controlled by one operating member.

[Technical background of the invention and its problems]

Many outboard motors and general-purpose engines are remotely controlled, and due to space constraints, it is recommended to control the throttle valve, choke valve, and stop switch using a single remote control wire or rod. is common. In other words, it is equipped with a throttle control lever whose swing is controlled by remote control, and its swing stroke is distributed, focusing on the throttle control stroke that controls the engine speed from idling to high speed operation. Set the stop switch control stroke to the high speed side and the stop switch control stroke to the high speed side.

In addition, since this type of engine operates at a constant rotation speed, the throttle valve is controlled by a governor device, and the governor spring is engaged with the throttle control lever to change the stress by the throttle control stroke. is given to adjust the rotation speed.

During the yoke control stroke, the yoke levers arranged in parallel engage with this part and swing together, closing the yoke valve. When starting, raise the throttle control lever all the way and close the choke valve. During the stop switch control stroke, the stop switch installed in this area acts.

In this way, one throttle control lever can remotely control the throttle valve, throttle valve, and stop switch.
When closing the throttle valve at start-up, the throttle control lever is swung further from the high-speed position to the high-speed side, resulting in abnormally high engine revolutions at start-up, which can lead to poor starting performance due to plug fogging caused by fully opening the throttle valve, or vice versa. There were problems such as engine damage due to high engine speeds when the engine was cold.

[Purpose of invention]

In view of the above-mentioned problems, this invention has a function that prevents an abnormal increase in rotation speed during startup by disconnecting the throttle control lever from the throttle valve when it controls the throttle valve. An object of the present invention is to provide a throttle control device for an engine having an extremely compact configuration.

[Summary of the idea]

In order to achieve the above object, the engine throttle control device of this invention is constructed as follows. In other words, the throttle control lever is connected to the remote control lever via a cable and has a control stroke set from the idling position to the high speed side position to the throttle control position, and is connected to the governor lever via a governor spring for stress adjustment. The throttle control lever and the spring lever connected to the throttle control lever and the throttle lever connected to the throttle control valve via a rod are respectively swingably supported on one common support shaft provided on the bracket, and the throttle control lever and the spring lever are connected. The throttle control lever is integrally connected to the throttle control lever so as to be able to swing integrally against the governor spring by a steering spring, and an adjustment screw screwed onto the throttle control lever is brought into contact with the spring lever to finely adjust the relative position of both levers. and the engagement piece provided on the throttle control lever is brought into contact with the engagement piece provided on the throttle control lever, so that both levers are integrated from the high speed side position of the throttle control lever to the throttle control lever. The present invention is characterized in that the bracket is provided with a stopper that limits the swinging range of the spring lever from an idling position to a high-speed position of the throttle control lever.

[Example of idea]

Hereinafter, explanation will be made with reference to figures showing embodiments of this invention.

Figures 1, 2, and 3 are side views of the device during idling, high-speed operation, and starting, and Figure 4 shows the operational relationship between the remote control member and the throttle control lever. It is an explanatory diagram.

One common support shaft 2 supported on bracket 1
A throttle control lever 3, a spring lever 4, and a choke lever 5 are each pivotally supported.

Throttle control lever 3 is connected to cable 6
The swinging is controlled by a remote control lever 7 via a remote control lever 7. As shown in Fig. 4, the swing stroke is centered on the throttle control stroke AB from the idling position A to the high speed position B, the throttle control stroke BC that continues to the high speed side, and the throttle control stroke BC to the low speed side until the throttle valve ON position C. The stop switch control stroke AD is divided into successive stop switch control strokes AD up to the stop switch ON position D.

The throttle control lever 3 and spring lever 4 are connected to a connecting spring 8.
are elastically connected and swing together.
The relative position of the coupling of both levers 3 and 4 is finely adjusted by an adjustment screw 9. One end of a governor spring 10 is suspended at the tip of the spring lever 4 in a direction opposed to the connecting spring 8. The other end of the governor spring 10 is engaged with a governor lever 12 on a governor shaft 11, and opposes the centrifugal force of a mechanical governor device installed on a crankshaft or the like with the governor shaft 11 in between. The governor lever 12 is designed to open and close an engine throttle valve via a rod 13 connected to its tip. The swinging displacement of the governor lever 12 changes the stress of the governor spring 10 and the engine rotational speed, that is, the centrifugal force, and the governor lever 12 comes to rest at a position where the two balance, and the engine rotational speed is maintained constant. By swinging the spring lever 4 and changing the set stress of the governor spring 10, the rotational speed of the engine during constant speed operation is adjusted.

In this way, A of throttle control lever 3
The spring lever 4 responds to the swinging displacement from B to B to extend the governor spring 10 and adjust the engine operating speed from idling (FIG. 1) to high speed operation (FIG. 2).

Next, the choke lever 5 is restricted to a fixed position by a return spring 14 and a stopper (not shown). The choke lever 5 is designed to open and close the choke valve via a rod 15 connected to its tip. An engaging piece 5a extends from the base end of the throttle control lever 5, and comes into contact with the engaging piece 3a provided at the rear end when the throttle control lever 3 swings to position B (Fig. 2). It's becoming like that.

Further, at the B position of the throttle control lever 3, an adjustable screw type stopper 16 installed on the bracket 1 is set to come into contact with a part of the spring lever 4. In other words, when the throttle control lever 3 is swung beyond the B position with the throttle control stroke BC,
The yoke lever 5 is interlocked to close the yoke valve at the C position, but during this time the spring lever 4 is prevented from swinging by the stopper 16, and the connecting spring 8 is expanded.

When the throttle control lever 3 swings from position A (FIG. 1) to position D, the engaging piece 3a at the tail end pushes the switch lever 17 of the stop switch attached to the bracket 1 to stop the engine.

According to the above embodiment, the rotational speed of constant speed operation can be adjusted, the opening/closing of the choke valve at the time of starting, and the stop can be selected by the swinging displacement of the throttle control lever 3, and a simple remote control mechanism can be used. This allows you to control the engine.

When the engine starts, the governor spring stress of the governor device is fixed at a constant value when closing the engine valve, so the engine can be started without needlessly increasing the engine speed.

Moreover, since the throttle control lever 3, spring lever 4, and choke lever 5 are each pivotably supported on one common support shaft 2 supported on the bracket 1, each lever 3, which is a movable part, , 4, and 5 can be arranged together in one place, and the stopper 16 for stopping the spring lever 4 when operating the spring lever 4 only needs to be arranged on the side of the spring lever 16. Another advantage is that the effect of improved functionality can be achieved with a compact configuration.

Note that the connecting spring 8 is not limited to a tension spring, but may also be a compression spring, a leaf spring, or the like.

[Effect of idea]

As mentioned above, in the engine throttle control device according to this invention, stress adjustment of the governor spring is performed via a spring lever that is elastically connected to the throttle control lever, and a stopper is used to adjust the stress of the governor spring during the throttle control stroke at the time of starting. This system is designed to maintain the stress of the governor spring at a constant level, unlike conventional devices, which do not tend to rotate at higher speeds than necessary when starting, resulting in poor starting performance due to plug fogging caused by fully opening the throttle valve, and conversely, cold engine running. There is no need to worry about damaging the engine due to high revs. Also, even if the throttle control lever is moved beyond the high speed position by mistake during normal operation, the engine speed will not be increased beyond the speed set at that position. A single remote control system controls everything from opening and closing the choke valve to adjusting the operating speed and stopping the engine, and has the effect of increasing the reliability of remote control of outboard motors and engines.

Furthermore, since the throttle control lever, spring lever, and choke lever, which are all operating members of one system, are supported on the same support shaft, the support structure is simple and many parts can be compactly assembled. Since all swinging movements of the lever are performed around one axis, the operating range can be set to the minimum by utilizing the difference in axial arrangement, resulting in space savings, miniaturization of the control mechanism, and reduction of assembly errors. Many effects such as higher accuracy of control operations can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a side view of a throttle control device during idling operation showing an embodiment of this invention;
FIG. 2 is a side view showing the state during high-speed operation, FIG. 3 is a side view showing the state at the time of starting, and FIG. 4 is an explanatory view showing the operational relationship between the remote control member and the throttle control lever. 1...Bracket, 2...Spindle, 3...Throttle control lever, 4...Spring lever, 5...Chickure lever, 3a, 5a...Engagement piece, 6...Cable, 7...Remote control lever, 8
... Connecting spring, 9 ... Adjustment screw, 10 ... Governor spring, 16
...Stotsupa.

Claims (1)

[Scope of utility model registration request] The throttle control lever is connected to the remote control lever via a cable and has a control stroke set from the idling position to the high speed side position to the throttle control position, and is connected to the governor lever via a governor spring for stress adjustment. A spring lever and a choke lever connected to a choke valve via a rod are each supported swingably on one common support shaft provided on a bracket, and the throttle control lever and spring lever are connected to each other by a connecting spring. The throttle control lever is connected so as to be able to swing integrally against the governor spring, and an adjustment screw screwed onto the throttle control lever is brought into abutment with the spring lever, thereby making it possible to finely adjust the relative position of both levers. , and the engagement piece provided on the throttle control lever is brought into contact with the engagement piece provided on the throttle control lever so that both levers are integrally moved from the high speed side position of the throttle control lever to the throttle control position. 1. A throttle control device for an engine, which is capable of swinging, and further comprising a stopper provided on said bracket to limit a swinging range of said spring lever from an idling position to a high speed side position of said throttle control lever.