Advance arrangement

Details Advance arrangement Advance arrangement

2005-09-13

2005-09-13

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

With fuel pump

C123S450000

Reexamination Certificate

active

06941932

ABSTRACT:
An advance arrangement controls timing of fuel delivery by a fuel pump for use in an engine. The advance arrangement includes an advance piston, a servo piston, a light load piston, and an arrangement. The advance piston is slidable within a first bore and 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 is exposed to fuel pressure within a first control chamber. The servo piston is slidable within a further bore provided in the advance piston to control the pressure of fuel within the first control chamber. The servo piston is responsive to speed dependent fuel pressure variations within a servo control chamber, thereby to permit adjustment of the timing in response to engine speed. The light load piston is moveable relative to the advance piston against the action of a light load control spring in response to fuel pressure variations within a light load control chamber. The arrangement ensures the servo piston is substantially unresponsive to speed dependent fuel pressure variations within the servo control chamber, in circumstances in which fuel pressure within the light load control chamber is increased beyond a predetermined amount.

REFERENCES:
patent: 3861835 (1975-01-01), Bakti
patent: 4037574 (1977-07-01), Swift
patent: 5370096 (1994-12-01), Cooke
patent: 5413079 (1995-05-01), Laufer
patent: 6041759 (2000-03-01), Burborough
patent: 0921300 (1999-06-01), None
patent: 1035311 (2000-09-01), None

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