Two-cycle engine with forward scavenging air positioning and...

Details Two-cycle engine with forward scavenging air positioning and... Two-cycle engine with forward scavenging air positioning and...

2005-05-10

2005-05-10

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Two-cycle

Rear compression

C261S023300

Reexamination Certificate

active

06889637

ABSTRACT:
A two-cycle engine having forward scavenging is provided. Mixture drawn into the crankcase via a butterfly valve carburetor is conveyed into a combustion chamber via transfer channels in the cylinder. An air duct is connected via a controllable connection with a transfer channel to supply essentially fuel-free air thereto during a load state of the engine. To convey a fuel quantity adapted to drawn-in air during idling and partial load, yet during full throttle to achieve separated supply of air and mixture, a dividing wall extends in the direction of flow of air in the carburetor intake duct. In the pivot region of the butterfly valve, a connecting aperture in the dividing wall is closed in full throttle by a completely open butterfly valve. During idling and partial load the connecting aperture is open so that a uniform pressure can form in the intake duct in conformity with drawn-in air.

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