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1. (WO2010114438) TWO-STROKE INTERNAL COMBUSTION ENGINE

Pub. No.:    WO/2010/114438    International Application No.:    PCT/SE2009/050340
Publication Date: Fri Oct 08 01:59:59 CEST 2010 International Filing Date: Wed Apr 01 01:59:59 CEST 2009
IPC: F02M 71/00
F02B 25/22
F02B 63/02
F02M 71/04
Applicants: HUSQVARNA AB
BERNEKLEV, Joel
BERGMAN, Mikael
Inventors: BERNEKLEV, Joel
BERGMAN, Mikael
Title: TWO-STROKE INTERNAL COMBUSTION ENGINE
Abstract:
A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: - a cylinder (2) configured to reciprocatingly receive a piston (6) therein defining a combustion chamber (8), the combustion chamber comprising an ignition means (5) for igniting an air/fuel mixture and an exhaust port (40) for evacuating the exhaust fumes, - a crank case (3) including a crank shaft (18), - an indirect fuel supply system (4), such as a carburettor (12) or a low pressure fuel-injection system, for supplying fuel to the crank case (3) to be scavenged to the combustion chamber (8), - at least one transfer duct (20, 20') each extending from the crank case (3) to at least one corresponding transfer port (21, 21') for connecting to the combustion chamber (8), - additional air filling means (25, 24, 27, 23, 23', 22, 22',26, 26') for at least partly filling the transfer duct/s (20, 20') with additional air from the transfer port (21, 21') towards the crank case (3), - and a direct injection means (7) for injecting fuel directly into the combustion chamber (8).