rocker arm

noun Machinery.
a rocking or oscillating arm or lever rotating with a moving shaft or pivoted on a stationary shaft.

Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rocker arm
 
n
a lever that rocks about a pivot, esp a lever in an internal-combustion engine that transmits the motion of a pushrod or cam to a valve

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The upper valve spring seat continued moving up the valve stem until it began to make contact with the neck of the rocker arm.
One broken spring piece had been bent by the rocker arm and had significantly dented the valve cover-nearly penetrating it.
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