Internal combustion engine

Details Internal combustion engine Internal combustion engine

2007-05-01

2007-05-01

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Two-cycle

Rear compression

C123S0730AE

Reexamination Certificate

active

11372189

ABSTRACT:
A two-stroke engine is for a portable handheld work apparatus such as a motor-driven chain saw, cutoff machine, brushcutter or the like. A combustion chamber (3) is configured in the cylinder (2) of the engine (1) and is delimited by a reciprocating piston (5). The piston (5) drives a crankshaft (7) via a connecting rod (6). The crankshaft (7) is rotatably journalled in the crankcase (4). The two-stroke engine includes a discharge opening (10) for conducting exhaust gases out of the combustion chamber (3) and an inlet (11) via which an air/fuel mixture is conducted to the crankcase (4). The air/fuel mixture passes via at least one transfer channel (12, 15) from the crankcase (4) into the combustion chamber (3). The transfer channels (12, 15) open at one end with a transfer window (13, 16) into the combustion chamber (3) and are connected at the other end to the crankcase (4). A bypass channel (20) conducts essentially fuel-free gas and opens via a membrane valve (19) into the transfer channel (15). The sum of all areas of the inlet windows (13, 16) referred to the piston displacement of the engine is approximately 1.4 mm2/cm3to approximately 5.90 mm2/cm3whereby good exhaust-gas values are obtained at low fuel consumption.

REFERENCES:
patent: 3797467 (1974-03-01), Tenney
patent: 5947066 (1999-09-01), Ishikawa
patent: 6571756 (2003-06-01), Rosskamp et al.

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