Choke valve mechanism for carburetor
A choke valve mechanism is described for a carburetor having an air and fuel mixing passage supplied with fuel through main and idle jets from a diaphragm-controlled fuel chamber, and a throttle and choke valve in the mixing passage, that improvement in which a choke valve which comprises three contiguous plates mounted for pivot movement in the mixing passage on a choke control shaft including: (a) a first plate substantially coextensive with the passage having diametrically opposed peripheral openings, (b) a second plate formed of shape-memory alloy secured centrally to the first plate having outer portions dimensioned to overlie the peripheral openings of the first plate, the outer portions being movable in response to temperature to close the openings at low temperatures and open the openings at high temperatures, and (c) a third plate secured centrally to the second plate having end portions angled from the general plane of the plates away from the openings to limit the axially outwardly movement of the outer portions of the second plate under conditions of high temperature.
- Assignee:
- Walbro Far East, Inc., Kawasaki
- Patent Number(s):
- US 4770823
- OSTI ID:
- 6666364
- Resource Relation:
- Patent File Date: Filed date 13 Aug 1987
- Country of Publication:
- United States
- Language:
- English
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