Fuel injection pump for an internal combustion engine having pre

Details Fuel injection pump for an internal combustion engine having pre Fuel injection pump for an internal combustion engine having pre

1989-02-22

1991-12-24

Smith, Leonard E.

Pumps

Expansible chamber type

Pumping member position controlled port

417499, 123299, F04B 704, F02B 300

Patent

active

050747665

ABSTRACT:
A fuel injection pump for an internal combustion engine has at least one pump piston movably disposed in a piston sleeve in a pump housing. The piston includes a first arrangement operable during a stroke in a suction direction for drawing fuel from a suction side of the pump. The piston further includes a second arrangement operable during a stroke in a delivery direction for first cutting off a connection to the suction side of the pump and then initiating delivery from a working chamber into a pressure line. The piston and piston sleeve are provided with a control arrangement which divides the fuel injection into pre-injection and main injection phases. At least one pressure limiting arrangement is provided and is associated with the working chamber. The limiting arrangement is operable during the pre-injection phase when a predetermined engine speed is reached for maintaining the pressure in the working chamber and in the pressure line at a predetermined level.

REFERENCES:
patent: 2871796 (1959-02-01), Dreisin et al.

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