Fuel injection pump for internal combustion engines

Internal-combustion engines – Charge forming device – With fuel pump

Patent

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Details

123504, 417499, F02M 3900

Patent

active

046115668

ABSTRACT:
In a fuel injection pump for internal combustion engines, a leakage connection is provided for varying the fuel supply quantity and the supply onset in accordance with rpm. The leakage connection, in a pump piston executing the stroke movement, is effective only at the beginning of the supply stroke of the pump piston and becomes gradually less effective in stages in the middle rpm range. The leakage connection has an outer groove in the pump piston, a blind bore discharging in the piston end face, and at least one throttle bore connecting the blind bore with the bore bottom of the outer groove. The outer groove extends over only a portion of the circumference of the pump piston and parallel to the piston end face at a very small distance therefrom.

REFERENCES:
patent: 2356511 (1944-08-01), Descourtis
patent: 2696786 (1954-12-01), Fleck et al.
patent: 3123006 (1964-03-01), Partridge
patent: 3435811 (1969-04-01), Guertler
patent: 3990413 (1976-11-01), Pischinger
patent: 4163634 (1979-08-01), Powers

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