Two-cycle engine having scavenging

Details Two-cycle engine having scavenging Two-cycle engine having scavenging

2006-11-07

2006-11-07

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

C123S0650PE

Reexamination Certificate

active

07131406

ABSTRACT:
A two-cycle engine in a portable, manually-guided implement, such as a power chain saw, a cut-off machine, a brush cutter, or the like, is provided. The cylinder has a combustion chamber that is delimited by a reciprocating piston that via a connecting rod drives a crankshaft that is mounted in a crankcase so as to be rotatable about a crankshaft axis. The cylinder has an outlet for conveying exhaust gases out of the combustion chamber, with the outlet having an axis of the channel thereof. The cylinder also has an inlet for supplying a fuel/air mixture to the crankcase. By means of at least two transfer channels, the fuel/air mixture is conveyed out of the crankcase and into the combustion chamber, with the transfer channels being disposed symmetrically relative to the axis of the channel of the outlet. When viewed in the direction of the longitudinal axis of the cylinder, the axis of the channel of the outlet is disposed at an angle of less than 90° relative to the longitudinal central axis of the crankshaft.

REFERENCES:
patent: 4549507 (1985-10-01), Baumhardt
patent: 4559908 (1985-12-01), Flaig et al.
patent: 6016776 (2000-01-01), Jonsson
patent: 6019074 (2000-02-01), Otome
patent: 6039012 (2000-03-01), Motoyama
patent: 6164066 (2000-12-01), Sakaguchi et al.
patent: 6588382 (2003-07-01), Uneta
patent: 6591606 (2003-07-01), Rosskamp et al.
patent: 19900445 (2000-07-01), None

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