| 摘要 |
A high-pressure plunger pump for high-pressure fuel pump capable of varying a pump discharge rate thereof, wherein a small back pressure chamber (62) is provided to close the end parts of sliding holes (8, 108, 208) for suction check valve discs (51, 151, 251), the small back pressure chamber (62) communicates with a feed fuel path (4) selectively by opening and closing its port hole (61) by drive parts (71, 471) of small solenoid switching valves (7, 407) and, when the suction check valve discs are operated, the feed fuel discharged through the port hole (61) of the small back pressure chamber (62) is discharged to a suction port (26) of a pump chamber (2) so as to replace the feed fuel inside the small back pressure chamber (62) sequentially with new one, whereby, because a small solenoid switching valve may be used, a high-speed response is enabled, production cost can also be minimized, follow-up to electric signals can be made accurate, and a pump discharge can be controlled precisely.
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