JPS57173546A - Idle compensator of carburetor - Google Patents

Abstract

PURPOSE:To improve a follow-up characteristic of a bimetal, provided in an idle compensator chamber, for temperature of the outside air, by detouring an outlet of said chamber, providing a bypass passage and always replacing air in said chamber with the outside air. CONSTITUTION:An idle compensator is operated in such a manner that at a rise of the ambient temperature, a bimetal 4 in an idle compensator chamber 2 is curved leftward to move a valve 5 leftward and open a correction air passage 6. In this way, air is supplied to the downstream of a throttle valve (not shown) through intake negative pressure to prevent a mixture from becoming overrich. In this case, a bypass passage 10 is provided in the vicinity of the valve 5 to communicate said chamber to the correction air passage 6. In this way, even if the correction air passage 6 is sealed by the valve 5 at idle operation, a small amount of air is circulated to the downstream of the throttle valve to always replace air in the chamber 2 with the outside air and improve a follow-up characteristic of the bimetal 4 for temperature of the outside air.