Advance arrangements

Details Advance arrangements Advance arrangements

2007-08-07

2007-08-07

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

With fuel pump

C123S450000

Reexamination Certificate

active

11496642

ABSTRACT:
An advance arrangement for controlling timing of fuel delivery by a fuel pump in an engine comprises an advance piston which is movable in either an advance or a retard direction to advance or retard, respectively, the timing of fuel pump delivery, wherein a surface associated with the advance piston is exposed to fuel pressure within a main advance control chamber. The advance piston has a supply port to allow fuel to flow into the main advance control chamber and a drain port to allow fuel to flow out of the main advance control chamber. A servo piston is movable relative to the advance piston to control opening and closing of the supply port and the drain port. The advance arrangement is characterised by a restricted flow means for restricting the flow of fuel out of the main advance control chamber through the drain port when the advance piston moves in the retard direction beyond a predetermined amount.

REFERENCES:
patent: 3869226 (1975-03-01), Sosnowski
patent: 4526154 (1985-07-01), DiDomenico
patent: 6041759 (2000-03-01), Burborough
patent: 6941932 (2005-09-01), Hopley et al.
patent: 2004/0084029 (2004-05-01), Hopley et al.
patent: 0657638 (1995-06-01), None

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