Two stage fuel injection pump with second stage located in the f

Details Two stage fuel injection pump with second stage located in the f Two stage fuel injection pump with second stage located in the f

1995-03-30

1997-06-24

Thorpe, Timothy

Pumps

Diverse pumps

Series

417462, 123450, F04B 2310, F04B 1902

Patent

active

056412746

ABSTRACT:
A low pressure side fuel path extending from a fuel inflow port to a feed pump, and a chamber, which can communicate with an inflow/outflow port, are formed by partitioning inside a housing. A cam ring, shoes and rollers are provided in the low pressure side fuel path to induce low pressure, low temperature fuel into the area surrounding the rollers. A space that communicates with the low pressure side fuel path without constriction is formed on the upstream side on the back surfaces of the shoes. A phase of the cam ring and the control sleeve is fixed with the adapter provided on the boundary of the low pressure side fuel path and the chamber. An intake passage communicating with the intake port may be formed in the adapter to shorten the intake path. The area around the rollers, which tends to become heated in an inner-cam type fuel injection pump, is cooled efficiently, cam jump is reduced, control of advance angle is performed separately and independently of the fuel injection quantity control, and the efficiency of fuel intake is improved.

REFERENCES:
patent: 4292012 (1981-09-01), Botherston
patent: 4601274 (1986-07-01), Seilly
patent: 4915592 (1990-04-01), Hishinuma et al.
patent: 5318001 (1994-06-01), Djordjevic
patent: 5383436 (1995-01-01), Fehlmann

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