Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor

摘要

An amount of air taken into an air leading type two-stroke engine is increased to enhance an engine output, and gas emission characteristic deterioration caused by blow-back is inhibited. An inhibition member 16 is disposed between a choke valve 4 in a full open position and a throttle valve 6 in a full open position. The inhibition member 16 includes, for example, a mesh member like a metal mesh. Mixed fuel containing oil is supplied to the air-fuel mixture channel 14. Numerous pores of the inhibition member 16 (mesh member) are occluded by a membrane of oil components of the mixed fuel. Consequently, entry of a blow-back flow of an air-fuel mixture from the air-fuel mixture channel 14 into the air channel 12 through the numerous pores of the flow inhibition member 16 (mesh member) can be inhibited.

主权项

1. An air leading type two-stroke engine that, at an initial stage of a scavenging process of the engine, induces air charged in a scavenging channel of an engine body into a combustion chamber thereof and then induces an air-fuel mixture inside a crankcase of the engine body into the combustion chamber through the scavenging channel, the two-stroke engine comprising:
a first passage extending from a filter element of an air cleaner to the engine body and allowing air to be supplied to the scavenging channel; a second passage extending from the filter element to the engine body and allowing at least air to be supplied to the crankcase; a communication portion that brings the first passage and the second passage into communication with each other; and an inhibition member that inhibits entry of a blow-back of the air-fuel mixture passing in the second passage into the first passage through the communication portion.