Advance arrangement

Details Advance arrangement Advance arrangement

2005-04-26

2005-04-26

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

With fuel pump

C123S450000

Reexamination Certificate

active

06883499

ABSTRACT:
An advance arrangement for use in controlling timing of fuel delivery by a fuel pump comprises an advance piston which is moveable within a first bore and which cooperates, in use, with a cam arrangement of a fuel pump to adjust the timing of fuel delivery by the pump, a surface associated with the advance piston being exposed to fuel pressure within an advance piston control chamber. The advance arrangement also includes a servo-piston which is slidable within a further bore provided in the advance piston to control the pressure of fuel within the advance piston control chamber, a surface associated with the servo-piston being exposed to fuel pressure within a servo control chamber. A non-drift arrangement, in the form of a drilling on or in the advance piston, is provided for preventing fuel pressure variations in the advance piston control chamber which would otherwise occur due to fuel leakage into or out of the advance piston control chamber whilst the servo control piston remains in a substantially fixed position. The advance arrangement may also include a damping arrangement for damping movement of the servo-piston in a direction to retard timing which occurs as a result of movement of the advance piston in a direction to advance timing at the end of a pumping event.

REFERENCES:
patent: 3552366 (1971-01-01), Kemp
patent: 4526154 (1985-07-01), DiDomenico
patent: 4557240 (1985-12-01), Sakuranaka
patent: 5769056 (1998-06-01), Geiger et al.
patent: 6041759 (2000-03-01), Burborough
patent: 6363917 (2002-04-01), Hopley
patent: 0303237 (1989-02-01), None
patent: 0921300 (1999-06-01), None
patent: 984745 (1965-03-01), None
patent: 000921300 (1999-06-01), None

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