High pressure pump with solenoid operated valve

Details High pressure pump with solenoid operated valve High pressure pump with solenoid operated valve

1997-10-29

2000-09-12

Freay, Charles G.

Pumps

Expansible chamber type

Pumping member position controlled port

417505, 417503, F04B 704, F04B 3908

Patent

active

06116870&

ABSTRACT:
A high pressure pump which has a working chamber, which on the one hand, is connected to a low pressure circuit via a solenoid valve and on the other hand, is connected to a high pressure reservoir via a check valve. The solenoid valve has a spring-loaded closing body, which cooperates with a valve seat and together with it, constitutes the check valve. When the magnet is without current, the check function of the closing body is switched off via a valve tappet of the solenoid valve so that even with an initial working stroke of the high pressure pump, the connection to the low pressure circuit is maintained. Only with a supply of current to the solenoid valve executed during the working stroke does the valve tappet allow the closing body to contact its valve seat, whereupon the high pressure delivery then begins. The high pressure pump is designated for use in fuel injection systems of diesel motor vehicle engines.

REFERENCES:
patent: 5286178 (1994-02-01), Schaef
patent: 5538403 (1996-07-01), Black
patent: 5577892 (1996-11-01), Schittler et al.

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