JPH0443858A - Device for supplying fuel for starting manually operated engine - Google Patents

Abstract

PURPOSE:To make it possible to start an engine even when the number of times that a starting rope is pulled at low temperatures is small by associating movement of a switching valve installed in an auxiliary fuel passage with that of the starting rope, and opening the valve when the rope is pulled. CONSTITUTION:When a starting rope 21 is pulled by a starting lever 22 a base portion 22a is extracted from a stopper 23 and separated from a valve bar 31 and the valve body 31 is separated from a valve opening 30 by the action of a spring. Then a coil starter 20 is actuated for cranking and thereby negative pressure is generated in an intake passage 8 and gasoline in an oil surface room 6 is sucked into an intake passage 9 through an auxiliary fuel passage 25. When the force to pull the starting lever 22 is weakened the lever 22 is fitted in the stopper 23 and closes a switching valve 26 and an engine is started with an increased amount of fuel. Even when the engine is not started by one operation at low temperatures, an increased amount of fuel is supplied to the engine each time the starting lever 22 is pulled, and the engine can be started by several times of operation even at very low temperatures.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starting fuel supply device for improving the startability of a manual engine, particularly the startability at low temperatures.

[Prior Art] It is well known that when starting an engine at low temperatures, it is necessary to supply a mixture with a higher concentration than when starting at room temperature or during steady operation. The type is equipped with an injection valve that operates only at low temperatures, and the carburetor type is equipped with a choke device to increase the amount of fuel.

On the other hand, in manual engines that operate the recoil starter by manually pulling the starting rope when starting, starting fuel is obtained by sucking fuel from the regular fuel supply system using the negative pressure generated in the intake passage during cranking. Therefore, the lower the temperature, the more times you have to pull the starting rope.Especially in engines that use gasoline, which does not evaporate well at low temperatures, at extremely low temperatures of -30°C, the starting rope must be pulled more often.
You cannot start it unless you pull it more than 30 times.

[Problems to be Solved by the Invention] A problem to be solved by the present invention is that it is extremely difficult to start a manual engine at low temperatures.

That is, the present invention aims to provide a means for starting the engine even when the starting rope is pulled only a small number of times at low temperatures.

[Means for Solving the Problem] In order to solve the above problem, an auxiliary fuel passage was provided to connect the fuel supply system to the downstream side of the throttle valve in the intake passage, and an on-off valve was installed in the auxiliary fuel passage. This opening/closing valve was linked to the starting rope so that it would open when the rope was pulled.

The fuel supply system to which the auxiliary fuel passage is connected is, in the case of gasoline, the part from the fuel tank through the fuel conduit to the constant oil level chamber of the carburetor, and in the case of LPG, the part from the fuel conduit to the primary chamber of the regulator. It is.

[Operation] When the starting rope is pulled to operate the recoil starter and crank the engine, negative pressure is generated in the intake passage. On the other hand, the opening/closing valve is opened in conjunction with the starting rope, and the fuel in the fuel supply system is drawn into the intake passage through the auxiliary fuel passage by the negative pressure, and this fuel becomes the additional fuel necessary for starting the engine.

[Example 1.2] Fig. 1.2 schematically shows a different example of a manual engine equipped with the starting fuel supply device of the present invention.

First, Fig. 1 shows the case where the fuel is gasoline, and the fuel in the fuel tank 2 installed on the engine 1 is introduced into the constant oil level chamber 6 of the carburetor 5 through the fuel conduit 3 by a drop, and then the air cleaner The mixture is mixed with the air taken in from 4 and supplied to the engine l through an intake pipe 8. On the other hand, the downstream side of the intake passage 9 consisting of the intake passage of the carburetor 5 and the intake pipe 8 is connected to the constant oil level chamber 6 by an auxiliary fuel passage 25 consisting of a pipe, and the on-off valve 26 is connected to this side. It was installed in the auxiliary fuel passage 25.

Next, Figure 2 shows the case where the fuel is LPG, and the cylinder 1
2 to the primary chamber 15 of the regulator 14 in the primary conduit 1
3a, the air is gasified under reduced pressure, sent to the mixer 16 through the secondary conduit 13b, mixed with air taken in from the air cleaner 4, and supplied to the engine 1 through the intake pipe 8. On the other hand, the intake passage 1 consists of the intake passage of the mixer 16 and the intake pipe 8.
The downstream side of the throttle valve 17 of No. 9 is connected to the primary conduit 13a by an auxiliary fuel passage 25 consisting of a vibrator, and an on-off valve 26 is provided in this auxiliary fuel passage 25.

Referring to Figure 3.4, the starting lever 22 connected to the tip of the starting rope 21 that operates the recoil starter 20 of the engine 1 in the above two examples is a cup-shaped lever attached to the side of the engine 1 when the engine 1 is not in operation. Base 22 to stopper 23
a is inserted into the engine and can be pulled out when pulled for starting, and the on-off valve 26 is installed in contact with the outer surface of the stopper 23.

The on-off valve 26 has an inlet chamber 28 and an outlet chamber 2 inside the valve body 27.
A valve rod 32 protruding from a valve body 31 that opens and closes a valve port 30 communicating with the valve body 27 . The structure includes a spring 33 that penetrates the wall of the stopper 23 and protrudes into the inside of the stopper 23, and further acts on the valve body 3I, which acts in the valve opening direction.
5b are connected to the inlet chamber 28 and the outlet chamber 29, respectively.

When the engine 1 is stopped and running, the base portion 22a of the starting lever 22 is fitted into the stopper 23, so that the base portion 22a pushes the valve stem 32 out of the stopper 23 and pushes the valve rod 32 out of the stopper 23.
1 is brought into close contact with the valve port 30 to block the inlet chamber 28 and the outlet chamber 29. Therefore, fuel does not flow through the auxiliary fuel passage 25 and is supplied only from the carburetor 5 or the mixer 16.

When the starting lever 22 is grasped and the starting rope 21 is pulled in order to start the engine l, as shown in Fig. 3.4, the base 2
2a is pulled out from the stopper 23 and separated from the valve stem 31, and the valve body 3I is separated from the valve port 30 by the action of the spring 33. At this time, the coil starter 20 operates to crank the engine 1, so that negative pressure is generated in the intake passage 9.19, and the gasoline in the constant oil level chamber 6 or the L in the primary conduit 13a is generated.
PG is drawn into the intake passage 9.19 through the auxiliary fuel passage 25. Therefore, the increased amount of fuel required for starting is increased by the throttle valve 7.
It will be supplied to the high negative pressure region downstream of No. 17. When the pulling force on the starting lever 22 is weakened, the starting lever 22 is fitted into the stopper 23 again, the on-off valve 26 is closed, and the engine is started using the increased amount of fuel.

Even when the temperature is low and the engine cannot be started with one operation, additional fuel is supplied each time the starting lever 22 is pulled, so even at extremely low temperatures, it is possible to start the engine with a few operations or less.

The on-off valve 26 may be opened and closed in direct conjunction with the starting rope 21, or the on-off valve 26 may be electromagnetically driven and a switch that opens and closes the current in accordance with the movement of the starting lever 22 or the starting rope 21 may be used. It may be opened and closed intermittently.

[Effects of the Invention] According to the present invention, fuel is introduced into the intake passage using the pulling operation of a manual rope and the negative pressure generated by cranking the engine. The starting rope can be easily started by reducing the number of times the starting rope is pulled even at low temperatures.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams of different embodiments of an engine equipped with the starting fuel supply device of the present invention, FIG. 3 is a longitudinal sectional view of the main part, and FIG. 4 is a line taken along line X-X in FIG. 3. FIG. Pipe, 5... Carburizer, 7.17... Throttle valve, 9,19
...Intake passage, 13a...-Secondary conduit, 14...Regulator, 16...Mixer, 2]...Starting rope, 22...Starting lever 25...Auxiliary fuel passage, 26...
・On-off valve, to

Claims (1)

[Claims] An auxiliary fuel passage is provided that connects the fuel supply system to the downstream side of the throttle valve in the intake passage, and an on-off valve is installed in the auxiliary fuel passage, and the on-off valve is linked to the starting rope and is activated when the rope is pulled. A starting fuel supply device for a manual engine, characterized in that it is configured to open a valve.