Fuel injection pump

Internal-combustion engines – Starting device – For airplane

Patent

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Details

123502, F02M 3900

Patent

active

049056409

ABSTRACT:
A pressure control valve is connected at one end with a suction chamber and with increasing pressure in the suction chamber shifts the instant of injection to early. A pressure relief line connects between a restoring chamber in the pressure control chamber with a pressure maintenance valve. The pressure maintenance valve includes a valve insert comprising a valve cylinder in which a compression spring-loaded valve body is disposed. The valve body has a sealing face that closes the pressure relief line. The diameter of the pressure relief line is smaller than the valve cylinder diameter. The diameter of the pressure relief line is selected such that the suction chamber pressure present at the sealing face moves the valve body away from the valve seat counter to the force of a compression spring contacting the valve body and opens up a pressure relief line leading onward. After the lifting of the valve body from the pressure relief line, the suction chamber pressure is present at the entire cross section of the valve body, and the force, now embodied by the cross section of the valve body and the suction chamber pressure established at idling rpm, attains a value, by comparison with the force of the compression spring that keeps the valve body away from the pressure relief line. This assures that the function of the cold start acceleration takes place only upon the first run-up of the engine. A rapid cold start acceleration is thereby advantageously attained, and a loud engine noise is only briefly audible.

REFERENCES:
patent: 4395990 (1983-08-01), Hofer
patent: 4430974 (1984-02-01), Bofinger
patent: 4453522 (1984-06-01), Salzgeber
patent: 4489698 (1984-12-01), Hofer
patent: 4509491 (1985-04-01), Kawatei
patent: 4619238 (1986-10-01), Hain
patent: 4622943 (1986-11-01), Braun
patent: 4733645 (1988-03-01), Hain
patent: 4796592 (1989-01-01), Hofer

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