Aktiebolaget Electrolux

Hans Str&ouml;m

Bo P Carlsson

Crankcase scavenged two-stroke internal combustion engine, in which at least one piston ported air passage, with length L , is arranged between an air inlet ( ) and each scavenging port ( &prime;) of a number of transfer ducts ( &prime;), with length L , from the scavenging port to the crankcase. The air passage is arranged from an air inlet ( ) equipped with a restriction valve ( ), controlled by at least one engine parameter, for instance the carburetor throttle control. The air inlet extends via at least one connecting duct ( &prime;) to at least one connecting port ( &prime;) in the engine's cylinder wall ( ). The connecting port ( &prime;) is arranged so that it in connection with piston positions at the top dead center is connected with flow paths ( &prime;) embodied in the piston ( ), which extend to the upper part of a number of transfer ducts ( &prime;). Each flow path of the piston is arranged so that the air supply is given an essentially equally long period, counted as crank angle or time, as the engine's inlet ( ), and the length of the inlet into which fuel is added, Li, is greater than 0.6 times the total length of the piston ported air passage L and the length of the transfer duct L , i.e. 0.6&times;(L &plus;L ) but smaller than 1.4 times the same length, i.e. 1.4&times;(L &plus;L ).

Two-stroke interal combustion engine

A two-stroke internal combustion engine comprising a cylinder ( ) with a movable piston ( ) in it, which cylinder at its one end has a combustion chamber ( ) and at its other end is connected to a crankcase ( ). The crankcase and the combustion chamber are mutually connected via a scavenging duct ( ), whose opening and closing is controlled by the movement of the piston, and a carburetor ( ) is via an inlet port ( ) connected to the crankcase. In order to simplify starting the engine it is provided with a device ( ) for supply of fuel to the scavenging duct ( ) adjacent the combustion chamber.

Growing community of inventors

Kode, Sweden

Hans Ström

Growing community of inventors

Kode, Sweden

Hans Str&ouml;m

Hans Ström