Internal-combustion engines – Charge forming device – With fuel pump
Patent
1998-03-09
2000-04-11
Miller, Carl S.
Internal-combustion engines
Charge forming device
With fuel pump
418132, F02M 3704
Patent
active
060476842
ABSTRACT:
A gear pump has a pair of gears a seal member for sealing up teeth of the gross engaging with each other in a sealed-up gear case, which seal member is provided at a place occupied by plurality of teeth in the vicinity of a working area of the teeth in a low pressure side of the gear case and is not connected to the gear case, the seal member having a low pressure fuel the flow of hole for flowing a low pressure fuel, wherein a tooth sealing angle for the plurality of teeth is set substantially to a value within a range of 35.degree..+-.5.degree. for gears having of 14 to 18 teeth, and a high pressure fuel flowing passage for the flow of a high pressure fuel, formed in a space other than the working area of the teeth and the area of and the sealing member, in the gear case. Further, a fuel system for vehicle engine, using the above-mentioned gear pump, includes a fuel tank, a first pipe connecting the fuel tank and the low pressure fuel flowing hole in the gear pump, a second pipe connecting a fuel injection nozzle and the high pressure fuel flowing passage in the gear pump, and a booster pump provided at an intermediate part of the first pipe, for raising the pressure of fuel transferred to the low pressure fuel flowing hole to a pressure value at which the occurrence of cavitation at the low pressure fuel flowing hole can be suppressed.
REFERENCES:
patent: 3890068 (1975-06-01), Davidson
patent: 3961872 (1976-06-01), Muller
patent: 4090820 (1978-05-01), Teruyama
patent: 4205648 (1980-06-01), Graham
patent: 4239468 (1980-12-01), Smith
patent: 4392798 (1983-07-01), Bowden
patent: 4518331 (1985-05-01), Wood
patent: 4527966 (1985-07-01), Laumont
patent: 4606713 (1986-08-01), Lipscombe
patent: 5485820 (1996-01-01), Iwaszkiewicz
Hiraku Kenji
Kadomukai Yuzo
Kita Yasuo
Okuna Kenji
Takahashi Yukio
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