rocker arm

American  

noun

Machinery.

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

---

rocker arm British  

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

---

Etymology

Origin of rocker arm

First recorded in 1855–60

Example Sentences

See Examples For:

rocker arm

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 ● Feb. 11, 2022

Three other Cobras went out altogether with mechanical failures: a broken rocker arm, broken baffles.

From Time Magazine Archive

The eccentric rod is fastened to a rocker arm having motion swinging about a pin or bearing in the governor slide, which may be raised or lowered by a cam operated by the governor.

From Scientific American Supplement, No. 787, January 31, 1891 by Various

The action of the rocker arm, therefore, so far as the main valve in the Buckeye is concerned, is no different than that which would occur if no rocker arm intervened.

From Scientific American Supplement, No. 787, January 31, 1891 by Various

If it was not for the reversal of motion of the cut off valve through the rocker arm this eccentric would be about in line with the crank, but on the other end.

From Scientific American Supplement, No. 787, January 31, 1891 by Various