rocker arm

American  

noun

Machinery.

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

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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

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Etymology

Origin of rocker arm

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 • Feb. 11, 2022

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

From Time Magazine Archive

See if rocker arm tappets have a .020′′ clearance from valve stem when valve is seated.

From Aviation Engines Design?Construction?Operation and Repair by Pag?, Victor Wilfred

Disconnect the valve rod from rocker arm and block valve stem so it cannot blow out of the gland or let valve work back.

From The Traveling Engineers' Association To Improve The Locomotive Engine Service of American Railroads by Anonymous

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