Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2005-07-12
2005-07-12
Lo, Weilun (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S506000, C123S514000, C137S601200, C137S491000, C137S512000
Reexamination Certificate
active
06915787
ABSTRACT:
A fuel supply apparatus having a fuel pressure regulator (60) for regulating the pressure of fuel discharged from a fuel pump (4) to a predetermined pressure, the fuel pressure regulator (60) including: a first chamber (62), formed in a case (61), into which fuel discharged from the fuel pump (4) flows, and a second chamber (63), into which the fuel flows via the first chamber (62); a fuel limiting means (64) disposed between the first chamber (62) and the second chamber (63), for limiting fuel flowing from the first chamber (62) into the second chamber (63); a pilot valve unit (65) having a passageway for opening to discharge fuel tank (2), when the fuel pressure in the second chamber (63) is more than a first set pressure (Pp); and a main valve unit (66) having a passageway for opening to discharge fuel into the fuel tank (2) when the fuel pressure in the first chamber (62) is equal to a second set pressure (Pm) between the first set pressure (Pp) and the predetermined pressure (Pi), whereby, in cases where returning flow volume drops, the pressure of the fuel delivered under pressure to the injector does not drop.
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Kuwada Hisashi
Yoshioka Hiroshi
Lo Weilun
Mitsubishi Denki & Kabushiki Kaisha
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