Membrane carburetor having a coupling arrangement for coupling t

Details Membrane carburetor having a coupling arrangement for coupling t Membrane carburetor having a coupling arrangement for coupling t

1989-12-20

1991-01-08

Miles, Tim

Gas and liquid contact apparatus

Fluid distribution

Valved

F02M 102

Patent

active

049833308

ABSTRACT:
The invention is directed to a membrane carburetor having an intake channel and a choke flap and throttle flap movably mounted in this channel one behind the other when viewed in the direction of flow through the channel. The choke flap is arranged in the intake channel for enriching the mixture for a cold start. The choke flap is pivoted into an out-of-service position so that the choke flap is fully opened after start and after the engine is running and has warmed. The membrane carburetor is as a rule tuned for the idle condition and for the full-load condition. However, relatively lean mixtures can form in the part-load region which can lead to a non-quiet running of the engine and possibly to engine damage. According to the invention, the throttle flap is coupled to the choke flap via a four-rod linkage for achieving a mixture enrichment in the part-load region of the engine. The choke flap is pivotable independently of the choke flap position predetermined by the linkage for the start position.

REFERENCES:
patent: 2082710 (1937-06-01), Mallory
patent: 2198676 (1940-04-01), Mallory
patent: 3342465 (1957-09-01), Szwargulski et al.
patent: 3575389 (1971-04-01), Goto et al.
patent: 3669636 (1972-06-01), Garretson et al.
patent: 3886917 (1975-06-01), Nakada et al.
patent: 4123480 (1978-10-01), Johansson
patent: 4351782 (1982-09-01), Bellicardi et al.
patent: 4439377 (1984-03-01), Nartowski
patent: 4672929 (1987-06-01), Wissmann et al.

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