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

When the exhaust valve is operated by the tappet rod and rocker arm the intake valve is also carried down with it.

From Project Gutenberg

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

From Project Gutenberg

A small non-revolving shaft was located directly under the rocker arm rollers that actuated the exhaust valves.

From Project Gutenberg

In case a rocker arm is used, both arms point in the same direction like the letter U.

From Project Gutenberg

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 Project Gutenberg