rocker arm

noun

, Machinery.

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

rocker arm

noun

1. 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

Word History and Origins

Origin of rocker arm¹

First recorded in 1855–60

Example Sentences

Among the notable features of the car is that McLaren have adopted pull-rod front suspension - where the rocker arm pulls the spring from below rather than pushing from above.

From BBC

Valves and rocker arms were similar to those of the early engines, the automatic inlet valve being retained.

From Project Gutenberg

On the fourteen-cylinder model the valve is operated directly by an overhead rocker arm with a gun metal rocker at its extremity coming in contact with the extremity of the valve stem.

From Project Gutenberg

JGR began using the Nikon microscope early last season to diagnose problems with their engines' rocker arms, which are reciprocating levers that convey radial movement from the camshaft into linear movement.

From Scientific American

The pump is attached to the rocker arm, and therefore easily accessible for repairs.

From Project Gutenberg