Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-11-24
1998-09-15
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123495, F02M 3704
Patent
active
058064931
ABSTRACT:
In an inner-cam system fuel injection pump, two balance ports that are offset symmetrically relative to a distribution port in a circumferential direction to form a Y-shape are formed at a rotor. The opening ends of the balance ports and the opening end of the distribution port are positioned on the same plane that is perpendicular to the axis of the rotor. The offset angle .theta. by which the balance ports are offset in the circumferential direction relative to the axis of the distribution port, the opening area S.sub.1 of the distribution port and the opening area S.sub.2 of each of the balance ports are set to satisfy a relationship expressed as S.sub.1 =.vertline.2.multidot.S.sub.2 .multidot.cos .theta..vertline.. The phase intervals of the fuel delivery passages and the phase interval of the two balance ports are set equal to each other. Seizure at the area where the rotor slides in contact with its supporting member is prevented effectively and stable injection characteristics are achieved by equalizing the residual pressures in the individual fuel delivery passages.
REFERENCES:
patent: 2515033 (1950-07-01), Connor
patent: 2716944 (1955-09-01), Ferris
patent: 4430047 (1984-02-01), Ilg
patent: 4915592 (1990-04-01), Hishinuma
patent: 5613839 (1997-03-01), Buckley
patent: 5619970 (1997-04-01), Collingborn
patent: 5619971 (1997-04-01), Kubo
patent: 5666921 (1997-09-01), Collingborn
Kubo Ken'ichi
Matsubara Jun
Urano Mitsunori
Yokota Toru
Miller Carl S.
Zexel Corporation
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