Fuel injection pump for internal combustion engines

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

1994-03-31

1996-01-30

Gluck, Richard E.

Pumps

Expansible chamber type

Pumping member position controlled port

123500, F02M 5926

Patent

active

054876516

ABSTRACT:
A fuel injection pump for internal combustion engines having a pump piston guided in a cylinder liner and defining in the cylinder liner a pump work chamber, which piston cooperates with a control opening in the wall of the cylinder liner to control the high pressure delivery. To control the supply onset, the pump piston has on its face end three control edges offset from each other along the length of the piston; a zero supply quantity region is provided between the first control edge, which controls a very early supply onset, and the remaining control edges. The control of the end of supply is achieved via an oblique control recess in the piston jacket face, which recess communicates with the pump work chamber, and which is embodied by two oblique grooves, which are offset from each other, whose edges toward the pump work chamber form a first oblique control edge, and a second oblique control edge separated from the first oblique edge by a shoulder; the distance between the second oblique control edge and the second face-end control edge disposed above it in the region of the shoulder is less than the diameter of the control opening, so that a zero supply quantity region is formed without sharply reducing the control path region on the pump piston.

REFERENCES:
patent: 4881506 (1989-11-01), Hoecker
patent: 5097812 (1992-03-01), Augustin
patent: 5219280 (1993-06-01), Yashiro
patent: 5396871 (1995-03-01), Faupel et al.

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