| 摘要 |
Two valve ports are formed in a pump housing to communicate with each other through a connection aperture. A spool valve is movably accommodated within the first valve port and adapted to form communication between the first valve port and a high pressure chamber through a communication aperture under a specific condition of engine drive. A pressure control valve has its cross section contracted gradually in its axial direction and accommodated within the second valve port to be reciprocative in synchronism with a plunger. A spill channel is formed in the pump housing for connecting the second valve port on a fuel exhaust side to a pump housing. Part of high pressure fuel within the high pressure chamber is guided, under a specific condition of engine drive, successively to the communication aperture.
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