Aktiebolaget Electrolux

Husqvarna Ab

Hans Ström

Lars Andersson

Göran Dahlberg

Bo I Jonsson

Bo P Carlsson

Roy Ekdahl

A crankcase scavenged two-stroke internal combustion engine () in which a piston ported air passage is arranged between an air inlet () and the upper part of a number of transfer ducts ('). The air inlet is 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 (&#x2032;) to at least one connecting port (&#x2032;) in the engine's cylinder wall (). The connecting port (&#x2032;) is arranged so that when the piston is in a top dead center configuration, it is connected with flow paths (&#x2032;) embodied in the piston (). The flow paths (&#x2032;) extend to the upper part of a number of transfer ducts (&#x2032;), and the flow paths in the piston are arranged so that the recess (&#x2032;) in the piston that meets the respective transfer duct's port (&#x2032;) in a manner that the air supply is given an essentially equally long period, counted as crank angle or time, in relation to the fuel and air mixture inlet period.

Two-stroke internal combustion engine

Crankcase scavenged two-stroke internal combustion engine (), in which a piston ported air passage is arranged between an air inlet () and the upper part of a number of transfer ducts ('). 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 (&#x2032;) to at least one connecting port (&#x2032;) in the engine's cylinder wall (). The connecting port (&#x2032;) is arranged so that it in connection with piston positions at the top dead center is connected with flow paths (&#x2032;) embodied in the piston (), which extend to the upper part of a number of transfer ducts (&#x2032;). Each flow path through the cylinder and piston is to a great extent arranged in the cylinder's lateral direction, on the one hand in that the connecting port (&#x2032;) and adjacent scavenging port (&#x2032;) of the cylinder are shifted sideways in relation to each other along the periphery of the cylinder wall (), and on the other hand in that the transfer ducts (&#x2032;) of the cylinder are running essentially in the cylinder's lateral direction away from each transfer port (&#x2032;) respectively, i.e. tangentially in relation to the circumference of the cylinder wall ().

Crankcase scavenged two-stroke internal combustion engine (), in which a piston ported air passage is arranged between an air inlet () and the upper part of a number of transfer ducts ('). The air inlet is equipped with a restriction valve (), controlled by at least one engine parameter, for instance the carburettor throttle control. The air inlet extends via at least one connecting duct (&#x2032;) to at least one connecting port (&#x2032;) in the engine's cylinder wall (). The connecting port (&#x2032;) is arranged so that it in connection with piston positions at the top dead center is connected with flow paths (&#x2032;) embodied in the piston (), which extend to the upper part of a number of transfer ducts (&#x2032;), and the flow paths in the piston are so arranged that the recess (&#x2032;) in the piston that meets the respective transfer duct's port (&#x2032;) is so arranged that the air supply is given an essentially equally long or longer period, counted as crank angle or time, in relation to the fuel and air mixture inlet period.

Growing community of inventors

Kode, Sweden

Hans Ström