Internal-combustion engines – Two-cycle – Rear compression
Reexamination Certificate
2005-05-23
2009-08-18
McMahon, M. (Department: 3741)
Internal-combustion engines
Two-cycle
Rear compression
Reexamination Certificate
active
07574984
ABSTRACT:
A crankcase scavenged two-stroke internal combustion engine (1) in which a piston ported air passage is arranged between an air inlet (2) and the upper part of a number of transfer ducts (3, 3′). The air inlet is equipped with a restriction valve (4), controlled by at least one engine parameter, for instance the carburetor throttle control. The air inlet extends via at least one connecting duct (6, 6′) to at least one connecting port (7, 7′) in the engine's cylinder wall (12). The connecting port (7, 7′) is arranged so that when the piston is in a top dead center configuration, it is connected with flow paths (9, 9′) embodied in the piston (13). The flow paths (9, 9′) extend to the upper part of a number of transfer ducts (3, 3′), and the flow paths in the piston are arranged so that the recess (10, 10′; 11, 11′) in the piston that meets the respective transfer duct's port (31, 31′) 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.
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Andersson Lars
Dahlberg Göran
Jonsson Bo
Ström Hans
Husqvarna AB
McMahon M.
Novak Druce & Quigg LLP
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