Pressure relief valve for a fuel injection pump of an internal c

Details Pressure relief valve for a fuel injection pump of an internal c Pressure relief valve for a fuel injection pump of an internal c

1989-09-05

1991-03-05

Chambers, A. Michael

Pumps

With condition responsive pumped fluid control

Plural separate sensing means for a single fluid controller

123458, 123506, 137110, F02M 3900

Patent

active

049973452

ABSTRACT:
A pressure relief valve for a fuel injection pump of an internal combustion engine contains a valve-closing element capable of moving, by means of an electromagnetic actuation device, between a closed position, in which it rests on a valve seat and closes a pressure relief connection between a pressure chamber and a pressure relief outlet, and an open position where the valve-closing element and a sleeve servo slide gate positioned thereon, separate from a valve seat to create a pressure relief opening for relief of fuel pressure. When the fuel pressure is sufficiently high, the servo slide gate separates from its seat, against the action of a spring, by an additional amount to expose an additional pressure relief connection on the valve-closing element for relief of fuel pressure. Despite only limited motion by the valve-closing element, the pressure relief valve facilitates, with extreme precision, control over the start and the end of fuel injection during the actuation stroke of a coordinated fuel pump.

REFERENCES:
patent: 3724485 (1973-04-01), Cox et al.
patent: 4394856 (1983-07-01), Smith et al.
patent: 4597369 (1986-07-01), Yasuhara
patent: 4753212 (1988-06-01), Miyaki et al.
patent: 4793314 (1988-12-01), Yoshinaga et al.

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