Internal-combustion engines – Charge forming device – Auxiliary control of carburetor fuel metering
Patent
1987-06-26
1988-11-29
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Auxiliary control of carburetor fuel metering
261 692, 261DIG68, F02M 712
Patent
active
047873566
ABSTRACT:
A carburetor arrangement changes the ratio of air and fuel in the air/fuel mixture for an internal combustion engine of a handheld motor-driven apparatus such as a chain saw, hedge trimmer or the like. The carburetor arrangement includes a membrane carburetor with a regulating membrane by means of which a valve needle is lifted from a valve seat against the force of a spring. The valve needle and valve seat conjointly define a valve for admitting fuel into a chamber of the carburetor. A positioning member is mounted with respect to the regulating membrane and is actuable in dependence upon the rotational speed of the engine. The actuation occurs such that the valve needle is additionally displaced a further incremental amount in response to a predetermined rotational speed of the engine thereby enriching the air/fuel mixture by an additional amount.
REFERENCES:
patent: 2774582 (1956-12-01), Bracke
patent: 3174730 (1965-03-01), Barr
patent: 3960126 (1976-06-01), Shinoda
patent: 4092380 (1978-05-01), Pierlot et al.
patent: 4314535 (1982-02-01), Takeuchi et al.
patent: 4579097 (1986-04-01), Yamamoto et al.
Langer Michael
Rosgen Stephan
Ottesen Walter
Stihl Andreas
Wolfe Willis R.
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