Patent ID: 6749180
Filing Date: 2004-06-15
Classification: F02B,F02M,Y02T,Y10S

Abstract:
A diaphragm carburetor for an internal combustion engine that operates with scavenging air, comprising:a carburetor housing provided with an intake channel portion; a butterfly valve that, via a butterfly valve shaft, is rotatably held in said intake channel portion, wherein fuel-supplying channels open into said intake channel portion in the vicinity of said butterfly valve; a regulating chamber that serves for receiving fuel and is formed in said carburetor housing along a longitudinal side of said intake channel portion, wherein said fuel-supplying channels receive fuel from said regulating chamber; a regulating diaphragm for separating said regulating chamber from a compensation chamber; at least one air channel for supplying additional combustion air; a respective air valve that, via an air valve shaft, is rotatably held in said at least one air channel, wherein said butterfly valve and said air valve, by rotation about their respective shaft, can be brought, in a closing direction, from an open position, in which said butterfly valve or said air valve only insignificantly influences flow in said intake channel portion or said at least one air channel, into a closing position, in which said intake channel portion or said at least one air channel is closed off in a substantially airtight manner, and in an opening direction from said closing position into said open position; and a coupling mechanism for coupling said air valve to said butterfly valve, wherein said coupling mechanism compensates for axial and radial tolerances, and wherein said coupling mechanism includes a spring.