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US 6,546,905 B2Granted
Valve drive mechanism for an internal combustion engine
AssigneeAndreas Stihl AG & Co. KG
InventorsBernhard Dürr, Harald Schliemann, Manfred Rabis
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AssigneeAndreas Stihl AG & Co. KG
InventorsBernhard Dürr, Harald Schliemann, Manfred Rabis
Estimating the term…
A valve drive mechanism is provided for an internal combustion engine, especially a four-stroke engine in a power chain saw. The implement housing is spanned by a front handle, the tubular grip of which is adjacent to the cylinder head of the engine and extends from one longitudinal side of the implement to the other longitudinal side thereof. A rocker arm of a valve control is pivotably mounted on the cylinder head between the ends of the rocker arm, with the rocker arm being pivotable about a pivot axis disposed transverse to the rocker arm. Push rods of a control mechanism engage one end of the rocker arm to actuate a poppet valve, on the valve stem of which the other end of the rocker arm acts. To be able to guide the tubular grip close to the center of gravity of the implement, the longitudinal axis of the rocker arm is disposed approximately parallel to the adjacent portion of the tubular grip.
A valve drive mechanism for an internal combustion engine of a portable, manually guided implement having an implement housing and a handle that spans the housing and that has a tubular grip disposed adjacent to a cylinder head of the internal combustion engine, wherein said tubular grip extends from one longitudinal side of said implement housing to another longitudinal side thereof, said valve drive mechanism further comprising:
Dependencies are inferred from the claim text.