Importance

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Abstract

A choke valve device in a carburetor including an opening spring for biasing a choke valve in a fully opening direction, a negative pressure operating chamber provided in a carburetor body to communicate with an intake passage at a location downstream from the choke valve, a locking piston which has a pressure-receiving face facing the negative pressure operating chamber and which is adapted to be advanced and retracted between a locked position (L) and a unlocked position (U), a locking spring for biasing the locking piston toward the locked position (L), and a locking recess which is provided in a choke lever secured to a valve stem so that the locking recess engages with the locking piston advanced to the locked position (L) when the choke lever is moved to a fully closed position (C) of the choke valve. When an intake negative pressure equal to or greater than a predetermined value is introduced into the negative pressure operating chamber upon starting an engine, the locking piston is retracted to the unlocked position (U) and disengaged from the locking recess, so that the choke valve is fully opened automatically by a biasing force of the opening spring. Thus, the automatic opening of the choke valve can be carried out with a simple structure having a reduced number of parts.

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First Claim