JPH0111973Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel supply system for a diesel engine.

Conventionally, Japanese Patent Laid-Open No. 56-64147 shows a structure having two injection valves for one cylinder. The conventional technology described in the same publication has two cylinders in the same cylinder.
Fuel is injected into the combustion chamber from the two injection valves 51 and 52, but this is simply through the two injection pipes 43 and 44 of the cam 1 into the combustion chamber 6 via the distributor 40.
It simply injects fuel into the same cylinder alternately at a rate of once per 1/2 revolution, and does not have a structure that discharges fuel with increased injection pressure, which improves fuel combustion efficiency. However, it had its limits.

The present invention has been devised for the purpose of solving the above-mentioned problems of the conventional structure.

The present invention will be explained based on the embodiment shown in the drawings. Reference numeral 1 is the first cylinder in a four-stroke diesel engine, 2 is the second cylinder, 3 and 4 are pistons, 5 and 6 are exhaust valves, and 7 and 8 are the second cylinder. Intake valve, 9,1
0 is the first injection valve, 11 and 12 are the second injection valves,
13 is a plunger camshaft of a fuel injection pump system that rotates at the same speed as the engine; 14 is a first fuel injection pump (hereinafter referred to as the first pump); and 15 is a second fuel injection pump (hereinafter referred to as the second pump). , and the pumps 14 and 15 are connected to the plunger cam shaft 1.
3, the pumps 14 and 15 are driven to discharge fuel at a rate of once per revolution of the camshaft, and both pumps 14 and 15 operate synchronously. 16 is a first switching valve means, 17 is a second switching valve means, 18 is a first injection pipe interposed between the first switching valve means 16 and the second injection valve 11, and 19 is a first injection pipe. The second injection pipe 20 is interposed between the first switching valve means 16 and the first injection valve 10, and the second injection pipe 20 is interposed between the second switching valve means 17 and the first injection valve
a first injection pipe interposed between the injection valve 9 and the injection valve 9;
Reference numeral 1 denotes a second injection pipe interposed between the second switching valve means 17 and the second injection valve 12. The first cylinder 1 and the second cylinder 2 are connected to one another on the crankshaft.
It is designed to explode and burn alternately each time it rotates. Further, the first and second switching valve means 1
6 and 17 switch the first injection pipe 1 once every half rotation of the plunger camshaft 13.
Fuel is alternately discharged into the injection pipes 8 and 20 and the second injection pipes 19 and 21.

Since this embodiment has the above configuration, the first cylinder 1
When the explosion stroke is performed in the first cylinder 1, the first and second injection valves 9 and 11 of the first cylinder 1 are
Fuel is simultaneously supplied through the injection valves 18, 20 of the second cylinder 2, and when the crankshaft rotates 360 degrees and the second cylinder 2 enters the explosion stroke, the first and second injection valves 10, Fuel is supplied under pressure to the engine 12 through the first and second injection pipes 19 and 21, and has the effect of greatly improving the output characteristics of the engine.

Although the case of the first and second cylinders 1 and 2 has been described above, it is possible to increase the number of cylinders by arranging an even number of cylinders and creating a configuration similar to the above embodiment. Needless to say.

[Brief explanation of the drawing]

The drawing is a block diagram of an embodiment of the present invention. 1: 1st cylinder, 2: 2nd cylinder, 9, 10: 1st
injection valve, 11, 12: second injection valve, 13: plunger cam shaft, 14: first pump, 15: second
pump, 16: first switching valve means, 17: second switching valve means, 18, 19: first injection pipe, 20,
21: Second injection pipe.

Claims (1)

[Scope of utility model registration request] A fuel injection system that includes a first injection valve and a second injection valve provided in a cylinder, and a plunger camshaft that rotates at the same speed as the engine rotation speed, and pumps fuel once per rotation of the camshaft. a pump, a first injection pipe and a second injection pipe branched from the pump;
and a switching valve which is provided at the branching portion of both the first and second injection pipes and alternately switches the fuel passage between the first injection pipe and the second injection pipe at a rate of one-half the rotational speed of the plunger camshaft. In the combination of the pair of cylinders and the pair of fuel injection pumps, the first injection pipe of one of the first injection pipes of both the fuel injection pumps is connected to the first injection valve of the first cylinder. The other first injection pipe is connected to the second injection valve of the first cylinder, and one of the second injection pipes is connected to the first injection valve of the second cylinder. The two injection pipes are connected to the second injection valve of the second cylinder, respectively, and the switching valve means of one fuel injection pump and the switching valve means of the other fuel injection pump are configured to switch in opposite directions to each other. Fuel for a diesel engine, characterized in that the fuel from the fuel injection pump is alternately pressure-fed to the first injection pipes and the second injection pipes via the switching valve means. Feeding device.