JPS6133247Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a carburetor accelerator, which fully utilizes the function of the accelerator pump when the accelerator is operated during engine operation when accelerating fuel is required. An object of the present invention is to provide an acceleration device having a means for keeping the function of an accelerator pump in a stopped state in response to an accelerator operation when the accelerator is stopped, so that accelerating fuel is not inadvertently supplied. It is something.

Generally, when accelerating an engine, the acceleration device that prevents temporary dilution of the air-fuel mixture and replenishes fuel is linked to the throttle valve, so not only when accelerating while the engine is running but also when the engine is stopped However, if the accelerator was operated incorrectly, fuel would be discharged from the accelerator nozzle in response to the movement of the throttle valve, resulting in poor starting due to fuel covering the spark plug, as well as wasteful fuel consumption.

The present invention was developed in view of the above-mentioned drawbacks, and is characterized by the fact that, in an accelerator pump that injects fuel into the intake passage in response to the opening operation of the throttle valve, an ignition valve is attached to the back of the diaphragm of the accelerator pump. The electromagnetic plunger is provided with an electromagnetic plunger that interlocks with the pump switch, and the plunger of the electromagnetic plunger is slidably fitted into the pump rod of the diaphragm. A spring with a large acting force is provided, and when the electromagnetic plunger is de-energized, the plunger pushes the diaphragm to release the interlock between the pump rod and the lever rod connected to the throttle valve, and when the electromagnetic plunger is energized, the plunger is pushed in. The pump is housed in an electromagnetic plunger, and the pump rod and lever rod are interlocked.

Next, an embodiment of the invented means will be explained with reference to the drawings.

1 is the intake path of the carburetor, 2 is the throttle valve,
3 is an acceleration pump which is divided into a pump chamber 5 and an atmospheric chamber 6 by a diaphragm 4. A fuel suction passage 7 communicates the fuel chamber 9 with the pump chamber 5 via a suction valve 8. 10 is a fuel discharge passage and an acceleration nozzle 11
and the pump chamber 5, and a discharge valve 12 is provided therein.
is interposed. A pump rod 13 has one end fixed to the diaphragm 4 and the other end protruding outside the diaphragm cover 14, and is attached to the valve shaft 1 of the throttle valve 2.
It is adapted to be pushed by a lever 23 which is interlocked with a throttle lever 16 fixed to the throttle lever 5.
The above is the structure of an accelerator device commonly used in the past.

In the present invention, an electromagnetic plunger 17 that interlocks with the ignition switch 18 is attached to the diaphragm cover 14, and the electromagnetic plunger 17 is attached to the diaphragm cover 14.
7 is provided with a plunger 19 movably disposed around the outer circumference of the pump rod 13, and this plunger 19 constantly moves the diaphragm 4 and the pump rod 3 in a direction that reduces the volume of the pump chamber 5 by the action of a spring 20. It is biased towards. Further, a return spring 21 is provided in the pump chamber 5 so as to always urge the diaphragm 4 to the right (in the direction of increasing the volume of the pump chamber 5). The relationship between the spring 20 and the return spring 21 is such that the acting force of the spring 20 is greater than that of the return spring 21.

When the engine is stopped, that is, when the ignition switch 18 is turned off, the electromagnetic plunger 17 is not excited, and the plunger 19 is activated by the spring 2.
0, the diaphragm 4 is moved in a direction that reduces the volume of the pump chamber 5. In this state, a distance L is set in advance so that the tip 13a of the pump rod 13 is at a position where it does not come into contact with the lever rod 23 even if the lever rod 23 is operated.

Next, when the ignition switch 18 is turned on and the electromagnetic plunger 17 is energized, the plunger 19 moves to the right side (plunger 19
is accommodated in the electromagnetic plunger 17) to return the diaphragm 4 to its normal position. In this state, the tip 13a of the pump rod 13
When the lever 23 is operated, the lever 23
The pump chamber 5 is forcibly moved in the direction of compressing the pump chamber 5 by the lever 23. A bypass passage 22 communicates the pump chamber 5 with the fuel suction passage 7 upstream of the suction valve 8.

Based on the above configuration, when the engine is running, the ignition switch 18 is turned on and the electromagnetic plunger 17 is excited, so the plunger 1
9 moves to the right (in the direction in which the plunger 19 is accommodated in the electromagnetic plunger 17) against the spring 20, and the diaphragm 4 is energized by the return spring 21 and returns to its normal use position. Along with this, the pump rod 13 moves to a position where it interlocks with the lever rod 23. That is, when the lever rod 23 is operated in this state, it engages with the tip 13a of the pump rod 13, operates the pump rod 13 and the diaphragm 4, and pushes the pump chamber 5 in a direction to decrease its volume, thereby performing a pumping action. , the fuel in the pump chamber 5 can be ejected from the acceleration nozzle 11 via the discharge valve 12.

Next, when the engine is stopped, the ignition switch 18 is turned off and the electromagnetic plunger 17 is de-energized, so that the plunger 19 is pulled by the spring 20.
is biased to move the diaphragm 4 to the left (pump chamber 5
In response to this, the pump rod 13 also moves to the left, and a distance L is formed between the tip of the pump rod 13 and the lever rod 23. Therefore, in this state, the lever rod 23, which is linked to the throttle lever 16, is disengaged from the pump rod 13, and the acceleration fuel flows into the acceleration nozzle 1 even if the accelerator is operated by mistake when the engine is stopped.
Therefore, there is no risk of the fuel being ejected into the intake passage 1.

Note that the ignition switch 18 is activated by the spring 20 and the return spring 21, which act in opposite directions.
When the diaphragm 4 is turned off, the moving speed of the diaphragm 4 becomes slow, and the fuel in the pump chamber 5 is returned to the fuel suction passage 7 upstream of the suction valve 8 from the bypass passage 22 without opening the discharge valve 12.

As described above, according to the present invention, the moving plunger acts as a stopper due to the relationship between the solenoid that opens and closes the electric circuit by the ignition switch and the spring, and when the engine is stopped, the acceleration pump membrane is stopped by the force of the spring. The pump rod fixed to the throttle valve is placed outside the operating range of the lever rod that is linked to the throttle valve so that it is not linked to the operation of the lever rod, and when the engine is running, the plunger is sucked into the solenoid. , the plunger releases the stopper of the pump rod,
In addition, the pump lever is returned to the position where it is linked to the lever lever by the action of the return spring, so the acceleration pump can be operated at will when the engine is running, and when the engine is stopped. This has the advantage of being able to reliably prevent discharge of accelerating fuel even if the accelerator is operated incorrectly, avoiding starting failures due to spark plug fogging, etc., and saving fuel.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal drawing showing an embodiment of the present invention, showing the state during engine operation. FIG. 2 is a longitudinal cross-sectional view showing the state when the engine is stopped according to the present invention. 1...Intake path of carburetor, 2...Throttle valve, 3...Acceleration pump, 4...Diaphragm, 1
3...Pump rod, 16...Throttle lever, 1
7...Electromagnetic plunger, 18...Ignition switch.

Claims (1)

[Scope of utility model registration request] An acceleration pump that injects fuel into an intake passage in response to opening of a throttle valve is equipped with an electromagnetic plunger on the back of a diaphragm that is linked to an ignition switch. The plunger is slidably fitted to the rod, and a spring with a force greater than that of the return spring of the diaphragm disposed in the pump chamber is disposed on the back of the plunger, and when the electromagnetic plunger is not energized, the plunger Pushing in the diaphragm to release the interlock between the pump rod and the lever rod connected to the throttle valve, and at the time of excitation, the plunger is accommodated in the electromagnetic plunger,
A carburetor accelerator device characterized in that a pump rod and a lever rod are linked.