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Wikipedia definition
1. Rocker armGenerally referred to within the internal combustion engine of automotive, marine, motorcycle and reciprocating aviation engines, the rocker arm is an oscillating lever that conveys radial movement from the cam lobe into linear movement at the poppet valve to open it. One end is raised and lowered by the rotating lobes of the camshaft (either directly or via a tappet and pushrod) while the other end acts on the valve stem.
Read “Rocker arm” on English Wikipedia
Read “ロッカーアーム” on Japanese Wikipedia
Read “Rocker arm” on DBpedia

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