Advance arrangements

Details Advance arrangements Advance arrangements

2008-04-01

2008-04-01

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Charge forming device

With fuel pump

C123S179130, C123S449000, C123S450000, C123S500000, C123S501000, C123S503000

Reexamination Certificate

active

07350508

ABSTRACT:
An advance arrangement for use in controlling timing of fuel delivery by a fuel pump for use in an engine comprises an advance piston (12) which is slidable within a first bore (14) 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 (12) is exposed to fuel pressure within a first control chamber (38). The pressure of fuel within the first control chamber (38) is controlled by means of a servo piston (24) which is slidable within a further bore (22) provided in the advance piston (12). The servo piston (24) is responsive to speed dependent fuel pressure variations within a servo control chamber (37), thereby to permit adjustment of the timing in response to engine speed. A light load piston (26) is moveable relative to the advance piston (12) against the action of a light load control spring (28) in response to load dependent fuel pressure variations within a light load control chamber (60), thereby to adjust the timing under light load conditions. The light load piston (26) is carried within a cold cranking sleeve (120) which is slidable within the first bore (14) against the action of a cold cranking control spring (128) in response to fuel pressure variations within a cold cranking control chamber (134). Thus, the cranking control spring (128) acts, in use, to slide the cold cranking sleeve (120) a predetermined distance in the advance direction and fuel pressure variations within the control chamber (134) serve to slide the cold cranking sleeve (120) back in the retard direction.

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patent: 6718951 (2004-04-01), Hopley
patent: 6792922 (2004-09-01), Simon et al.
patent: 6941932 (2005-09-01), Hopley et al.
patent: 2007/0023013 (2007-02-01), Chapman et al.
patent: 1356196 (2003-10-01), None

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