Fuel injection device for internal combustion engines, in partic

Details Fuel injection device for internal combustion engines, in partic Fuel injection device for internal combustion engines, in partic

1990-05-22

1991-08-20

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Fuel injection system

123501, 239 95, F02M 5932

Patent

active

050405110

ABSTRACT:
A fuel injection device of for internal combustion engines, particularly a unit fuel injector, having a pump piston preferably driven via a drive cam and having a free piston hydraulically driven by the pump piston, the free piston divides a pump chamber from a pressure chamber, from which a pressure line leads to an injection nozzle of the engine. Via a magnetic valve, the fuel to be injected is first metered into the pressure chamber during the intake stroke of the pump piston and subsequently, in the control stroke, an injection quantity determining the supply onset is metered into the pump chamber. The pump piston with spaced annular grooves serves as a reversal device. During the metering stroke, a maintenance pressure that is lower than the metering pressure of the fuel and is generated via a pressure control valve is maintained in the pump chamber.

REFERENCES:
patent: 4235374 (1980-11-01), Walter et al.
patent: 4425894 (1984-01-01), Kato
patent: 4531672 (1985-07-01), Smith
patent: 4951631 (1990-08-01), Eckert
patent: 4976244 (1990-12-01), Eckert

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