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US 8,800,505 B2Granted
Engine power tool
AssigneeHitachi Koki Co., Ltd.
InventorNaoto Ichihashi
Life of this patent
Estimating the term…
Abstract
An engine for rotating a saw chain serving as a rotating tool includes an engine main body including a crank case and cylinder. A cooling fan for generating forced cooling air is attached to a protruding end of a crank shaft. An engine cover for covering a top of the cylinder is provided in the engine, and an air guiding rib extending in a direction of crossing the cooling air is provided in an inner circumferential surface of the engine cover. In the engine cover, opening portions for exhausting the cooling air outside are provided.
Claims15
An engine power tool including an engine main body including:
- a crank case in which a crank shaft is embedded so as to be rotatable and a cylinder in which a piston for rotating the crank shaft is embedded so as to be reciprocatable;
- and a power tool main body to which a rotating tool rotated by the crank shaft is attached,
- the engine power tool comprising:
- a cooling fan which is attached to one protruding end of the crank shaft and which generates forced cooling air;
- an engine cover in which an exhaust port for the forced cooling air is provided on the other protruding end of the crank shaft and which covers a top of the engine main body;
- and
- an air guiding rib which is provided on an inner surface of the engine cover so as to protrude therefrom and so as to extend in a direction of crossing the forced cooling air flowing along the cylinder from the protruding end of the crank shaft toward an opposite side thereof,
- wherein an opening portion which is formed so as to externally open a downstream side of the forced cooling air with respect to the air guiding rib is provided in the engine cover.
5 more elements
Dependencies are inferred from the claim text.