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Rocker arm

Rocker arm referred with the internal combustion engine of automotive auto parts, marine, motorcycle, car, truck and reciprocating aviation engines, the rocker arm is a reciprocating lever that conveys radial information from the cam lobe into linear information at the poppet valve to open it. When the camshaft lobe raises the outside of the arm, the inside presses down on the valve stem, opening the valve. When the outside of the arm is lowered by the camshaft, the inside rises, allowing the valve spring to close the giver.

The ratio of the distance from the rocker arm's center of rotation to the tip divided by the distance from the center of rotation to the point acted on by the camshaft or pushrod.

For auto engines which use rocker arms are generally steel stampings, providing a reasonable balance of strength, weight and economical cost. Because the rocker arms are part of the reciprocating weight of the engine, excessive mass limits the engine's ability to reach high operating speeds.

 

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