초록 ▼

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

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.

대표청구항 ▼

[ I claim:] [1.] A high pressure pump for fuel injection for diesel engines, comprising a pump cylinder (4, 26), a tappet-operated pump piston (3, 19), said pump piston moves in reciprocation in said pump cylinder (4, 26), a solenoid valve (9, 30) in a low pressure line (17), said solenoid valve com

[ I claim:] [1.] A high pressure pump for fuel injection for diesel engines, comprising a pump cylinder (4, 26), a tappet-operated pump piston (3, 19), said pump piston moves in reciprocation in said pump cylinder (4, 26), a solenoid valve (9, 30) in a low pressure line (17), said solenoid valve comprises in combination (16) with a closing body (31) a magnet, a magnet armature connected to a valve tappet (13) and a fit check valve, said check valve controls both an influx of fuel from a low pressure circuit (17) to a working chamber (5, 21, 35) in the pump cylinder (4, 26) and a return flow of fuel from the working chamber (5, 21, 35) to the low pressure circuit (17), a high pressure fuel line (6) from said working chamber to a high pressure reservoir, a second check valve (7, 34) inserted into said high pressure fuel line (6), that an onset of high pressure delivery of the high pressure pump (1, 18, 28) initiated by de-energizing the magnet of the solenoid valve (9, 30) to permit said closing body of said solenoid valve to close.