| 摘要 |
PURPOSE: An internal combustion engine is provided to reduce wear by contacting orimulsion only with an injection valve that is not sensitive to wear particles. CONSTITUTION: In an internal combustion engine using orimulsion substituted for the existing fuel of an injection system(1), The injection system has at least one injection valve(2) for supplying the fuel through a fuel pipe(16) branched from a fuel pressure source(3) activated by a cycle of the internal combustion engine. An injection nozzle(10) of the injection valve is closed by a nozzle needle(11). The nozzle needle is lifted up from a sheet against force of a return device by the pressure of fuel in a pressure chamber penetrated with the nozzle needle and communicated with the fuel pipe. The fuel pressure source is coupled to the fuel pipe through two parallel flow-passages(20,21) having check valves(23,24) opposite to each other. The fuel pipe is linked to an orimulsion tube(17) near the injection nozzle. The orimulsion tube having a check valve(25) opened forward is branched off from an orimulsion pressure source(7) activated by the cycle of the internal combustion engine. The pressure of the pressure source is larger than the opening pressure of the check valve opened backward and disposed in the fuel pressure source and the check valve installed in the orimulsion tube and smaller than the opening pressure of the nozzle needle.
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