| 摘要 |
A two-stroke engine, especially for a portable handheld work apparatus such as motor-driven chain saws, cutoff machines or the like, has a combustion chamber (3) which is configured in a cylinder (2) and is delimited by a piston (4) moving upwardly and downwardly. The two-stroke engine (1) includes transfer channels (15, 15', 15'', 16, 16', 16'') which open into the crankcase (8) with openings (19, 20) and fluidly connect the crankcase (8) to the combustion chamber (3) at specific positions of the piston (4). The two-stroke engine (1) includes an intake channel (11) for supplying an air/fuel mixture into the crankcase (8) via an inlet (9) and is connected to an air filter (13). At least one air channel (12) supplies additional combustion air into at least one transfer channel (15, 15', 15'', 16, 16', 16''). For a good load-independent air/fuel mixture ratio, it is provided that the length (a) of the intake channel (11) is up to 60% of the length (b) of the clean air path; and, the length (b) of the clean air path is the mean channel length from the air filter (13) to the opening (19, 20) of a transfer channel (15, 16) into the crankcase (8).
|
