Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1982-09-22
1984-01-17
Lazarus, Ira S.
Internal-combustion engines
Charge forming device
Fuel injection system
123500, 239 88, F02M 5702
Patent
active
044258941
ABSTRACT:
A fuel injecting device has a fuel pump and a fuel injector. The fuel injector comprises a housing having a first bore and second bore, a delivery plunger inserted in the first bore for reciprocation and driven by an engine in synchronism therewith, a delivery pump chamber defined between the first bore and the delivery plunger, an injection plunger inserted in the second bore for reciprocation, an injection pump chamber defined between the second bore and one end of the injection plunger, a pressure chamber defined between the second bore and the other end of the injection plunger for communicating with the delivery pump chamber, an injection nozzle connecting with the injection pump chamber, a feed port formed in the housing and operatively opening into the delivery pump chamber for conducting fuel into the delivery pump chamber, a timing port formed in the housing and operatively opening into the delivery pump chamber, the timing port being so located that the timing port is closed by the delivery plunger after the feed port is closed by the delivery plunger, and that the latest injection timing is determined when the timing port is closed by the delivery plunger during injection at the latest injection timing, a spill port formed in the housing and connecting with the injection pump chamber for determining the injection termination, a drain port formed in the housing and connecting with the pressure chamber at the latest immediately after the injection termination, a metering passage connecting with the injection pump chamber for supplying fuel to the injection chamber, and a check valve in the metering passage for preventing the fuel supplied to the injection pump chamber from flowing backward. The fuel injecting device further comprises a pump for raising the pressure of fuel from the fuel tank to a predetermined level, a metering element connecting the pump with the metering passage for metering the fuel supplied to the injection pump chamber, a timing control element connecting with the timing port through a timing passage for controlling the starting time of the fuel injection by closing the timing passage, an orifice formed in the timing passage, and a fuel supplier connecting with the feed port for supplying fuel from the fuel tank to the delivery pump chamber when the delivery plunger is raised.
REFERENCES:
patent: 4129253 (1978-12-01), Bader et al.
patent: 4235374 (1980-11-01), Walter et al.
patent: 4317541 (1982-03-01), Beardmore
patent: 4327694 (1982-05-01), Henson et al.
patent: 4378774 (1983-04-01), Kato
patent: 4385609 (1983-05-01), Kato
Akashi Tetsuji
Kato Masaaki
Lazarus Ira S.
Moy Magdalen
Nippondenso Co. Ltd.
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