Fuel pump assembly

Details Fuel pump assembly Fuel pump assembly

1999-03-12

2000-11-07

Walberg, Teresa

Pumps

Successive stages

With interstage discharge or additional discharge from...

417286, 123446, F04B 300, F04B 500, F04B 2500

Patent

active

061427470

ABSTRACT:
The invention relates to a fuel pump assembly having a low-pressure region (ND) with at least one low-pressure pump-and a high-pressure region (HD) with at least one regulated-quantity high-pressure pump, which pumps a quantity of fuel required to compensate for the quantitative balance in the high-pressure region, the quantity regulation being effected via a metering unit which is disposed between the low-pressure pump and the high-pressure pump. In order, by simple and sturdy means with high availability and a long service life, to prevent the fuel quantity in correctly pumped by the metering unit at certain operating points from reaching the high-pressure region, the invention proposes that the pumping flow of the low-pressure pump is greater than the pumping flow of the high-pressure pump; that a fuel return line branches off between the metering unit and the high-pressure pump and discharges into the inlet of the low-pressure pump; and that a control element is disposed in the return line.

REFERENCES:
patent: 3919989 (1975-11-01), Jarrett et al.
patent: 4187822 (1980-02-01), Craven et al.
patent: 4253802 (1981-03-01), Glikin
patent: 4260333 (1981-04-01), Schillinger
patent: 4377139 (1983-03-01), Jarrett et al.
patent: 4738596 (1988-04-01), Abinett et al.
patent: 5064357 (1991-11-01), Smith
patent: 5180290 (1993-01-01), Green
patent: 5404855 (1995-04-01), Yen et al.
patent: 5927322 (1999-07-01), Rosenau
patent: 5971718 (1999-10-01), Krueger et al.
patent: 5996556 (1999-12-01), Klinger et al.

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