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rocker arm

noun, Machinery.
a rocking or oscillating arm or lever rotating with a moving shaft or pivoted on a stationary shaft.
Origin of rocker arm
First recorded in 1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for rocker arm
Historical Examples
  • An attendant switched on the warning light and rocker arm that warned people outside of the stage not to barge in.

    Jimsy and the Monsters Walt Sheldon
  • When the exhaust valve is operated by the tappet rod and rocker arm the intake valve is also carried down with it.

    Aviation Engines

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

    Aviation Engines

    Victor Wilfred Pag
  • The rocker arm bearings are adequately lubricated by a compression grease cup.

    Aviation Engines

    Victor Wilfred Pag
  • rocker arm supports are steel studs with enlarged heads to take a double row ball bearing.

    Aviation Engines

    Victor Wilfred Pag
  • The valves are operated through a push rod and rocker arm construction, which is 7⁄16′′ and exceedingly light.

    Aviation Engines

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

    Steam Engines

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

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

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

British Dictionary definitions for rocker arm

rocker arm

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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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