Fuel injection pump for internal combustion engines

Details Fuel injection pump for internal combustion engines Fuel injection pump for internal combustion engines

1993-03-05

1994-02-15

Bertsch, Richard A.

Pumps

Expansible chamber type

Pumping member position controlled port

417499, 123299, 123507, F04B 704

Patent

active

052861783

ABSTRACT:
A fuel injection pump for internal combustion engines, having a pump piston that is guided axially and rotationally movably in a cylinder bore of a cylinder liner and that with a face end defines a pump work chamber. The fuel injection pump pumps a quantity of fuel that is divided into a preinjection quantity and a main injection quantity. On a jacket face, this pump piston has known oblique grooves for the high-pressure pumping diversion process, and also a recess, which cooperates with an annular groove in the cylinder bore and with a control opening which discharges into a low-pressure chamber, and on its end face the piston has a cutout formed by two different, deep shoulders; the cutout is recessed within the annular groove continuously and cooperates with a first control opening that discharges into the low-pressure chamber. During the high-pressure pumping phase, depending on the rotary position of the pump piston, the pump work chamber can be relieved via the annular groove, the recess, and the control opening; this interruption in high-pressure pumping can be limited to the partial-load or the full-load range, depending on the embodiment.

REFERENCES:
patent: 4023916 (1977-05-01), Indra
patent: 4611566 (1986-09-01), Kampichler et al.
patent: 4824341 (1989-04-01), Augustin
patent: 4897024 (1990-01-01), Hatz et al.
patent: 4957418 (1990-09-01), Pischinger et al.
patent: 4975029 (1990-12-01), Hatz
patent: 5209208 (1993-05-01), Siebert et al.

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