Two-stroke internal combustion engine

Details Two-stroke internal combustion engine Two-stroke internal combustion engine

1997-02-26

1997-12-23

Okonsky, David A.

Internal-combustion engines

Two-cycle

Rear compression

123 73PP, 123 65P, F02B 3304

Patent

active

056997612

ABSTRACT:
A two-stroke internal combustion engine in a working machine such as a chain saw has been prone to stalling when the stance of the machine was changed from slanting down to slanting up. Such stalling is minimized when lower longitudinal scavenging passage in the cylinder block of the engine have smaller cross section as compared with upper scavenging passage, and when the crank chamber of the engine includes a flow restricting portion for impeding the flow of liquid fuel into the lower scavenging passage when the stance is changed. The engine has a cylinder block (12), a crankcase (20), scavenging passages (27, 27), and a flow restricting portion (40) on an inner peripheral surface (22a) of the crank chamber (22).

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