JPH0130616Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a starting device for an internal combustion engine.

The first device is a pilot air system, which is common for internal combustion engines and starts by blowing compressed air into the combustion chamber.
As shown in the figure. In the figure, a is an air compressor;
b is an air tank, c is a control valve, d is a starting air main pipe, e is a starting air distribution valve, f is a starting air pipe, and g is a starting valve.

When the control valve c is opened, compressed air flows into the starting air distribution valve e through the starting air main pipe d, is distributed according to the ignition order, enters the starting air pipe f, and opens the starting air pipe g. When the starter valve g opens, compressed air enters the combustion chamber, pushes down the piston of the engine during the explosion stroke, rotates the crankshaft, and starts the engine. At this time, the blowing of compressed air into the combustion chamber continues until the control valve c is closed.

The conventional method described above has the following drawbacks.

(1) Even if the engine has started and is in operation, close the control valve manually, or install a timer or the like and use a solenoid valve as the control valve, and use electricity to blow compressed air until the control valve closes. Since the engine continues to be crowded, the amount of compressed air consumed per start is large.
Therefore, a large capacity air tank is required.

(2) When using a solenoid valve as a control valve and closing the control valve according to the set time of the timer, it is necessary to allow sufficient margin for the set time in consideration of changes in ambient conditions at the time of startup. It also requires a power source.

(3) The cost is high because a large air tank is required.

The purpose of the present invention is to provide a starting device that eliminates the above-mentioned conventional drawbacks, and is characterized by the fact that, in an internal combustion engine that starts by blowing compressed air into the combustion chamber, An operation detection valve that automatically cuts off the supply of the compressed air due to force is provided in the middle of the main starting air pipe.

That is, an operation detection valve is provided that blocks the flow of compressed air into the main starting air pipe even if the control valve opens once the engine has completed starting.

The present invention can be applied to compressed air started engines.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of the starting device according to the present invention.

In the figure, 1 is an air compressor, 2 is an air tank, 3 is a control valve, 4 is an operation detection valve, 5 is a starting air main pipe, 6 is a starting air distribution valve, 7 is a starting air pipe, and 8 is a starting valve.

FIG. 3 is a sectional view showing the main parts of the operation detection valve 4 according to one embodiment of the present invention.

In the figure, 11 is a rotating plate, 12 is a drive shaft, 1
3 and 13a are connection holes leading to the starting air main pipe, 1
4 is a valve, 15 is a spring, 16 is a spring retainer, 17 is a lock nut, 18 is a bearing,
19 is an operation detection valve cover, 20 is an operation detection valve body, and 21 is a pin.

The operation in the case of the above configuration will be described.

FIG. 3 shows the state of the rotating plate when the engine is not rotating. The compressed air that has passed through the control valve 3 flows from the connection hole 13 of the rotating plate 11 into the starting air distribution valve 6 through the connecting hole 13a leading to the starting air main pipe. The compressed air passing through the starting air distribution valve 6 enters the starting air pipe 7 and actuates the starting valve 8 of that cylinder. Compressed air is blown into the combustion chamber by actuation of the starter valve 8, and the engine rotates.

When the engine speed increases, the rotation of the rotary plate 11 in conjunction with the engine causes the valve 14 built in the rotary plate 11 to move toward the outer circumferential side against the spring 15 due to centrifugal force.

The valve 14 completely closes the connection hole 13 of the rotating plate 11 once the engine has finished starting. At this time, the supply of compressed air to the connection hole 13a side is cut off.

The above case has the following effects.

(1) Since the amount of compressed air required per start is reduced, a small capacity air tank can be used, reducing costs and requiring less space for the air tank.

(2) Compressed air consumption can be made the same for automatic starting and manual starting, improving starting reliability.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a conventional starting device, Fig. 2 is an explanatory diagram showing an embodiment of the starting device according to the present invention, and Fig. 3 is a sectional view showing the main parts of the operation detection valve shown in Fig. 2. be. 2...Air tank, 3...Control valve, 4...Operation detection valve, 5...Starting air main pipe, 6...Starting air distribution valve, 8...Starting valve, 11...Rotating plate, 1
3, 13a... Connection hole, 14... Valve.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine that starts by blowing compressed air into the combustion chamber, an operation detection valve is installed in the main starting air pipe to automatically cut off the supply of compressed air by centrifugal force when the engine starts. A starting device for an internal combustion engine.