Patent ID: 6264175
Filing Date: 2001-07-24
Classification: F02M

Abstract:
An automatic adjustment carburetor capable of offering fuel economy and low pollution, wherein an automatic adjustment air-blocking device and a gas enrichment device are appended in an intake passage of said carburetor, said air-blocking device being disposed in said intake passage in front of a throttle having a fuel needle, said air-blocking device comprising a positioning shaft, an intake annular seat, a pair of locking springs, an air-blocking cone, and a spring, the middle section of said intake passage forming a room having a neck, a venturi tubular front part of expanding arc shape was formed extendedly forward from the neck in the intake passage, a rear part of pot belly shape was formed extendedly backward from the neck in the intake passage, an annular groove at the outer end of said intake passage joining said intake annular seat, said positioning shaft having a plurality of positioning grooves being installed near two ends thereof, one said positioning groove on each end of said positioning shaft joining said locking spring, the front end of said positioning shaft extending into a central hole of said intake annular seat to form a thread screwed with a nut, said air-blocking cone lagging said positioning shaft, the front end of said air-blocking cone sticking to said front locking spring, said spring seat with a diameter larger than that of said locking spring being installed at the rear end of said air-blocking cone to lag one end of said spring, the other end of said spring sticking to a protruding locking edge at the other end of said positioning shaft;whereby if said throttle at the rear part generates a negative pressure, said air-blocking cone will automatically reciprocate back and forth.