wrist pin

noun

, Machinery.

a pin joining the end of a connecting rod to a trunk piston or the end of a piston rod.

wrist pin

a cylindrical boss or pin attached to the side of a wheel parallel with the axis, esp one forming a bearing for a crank
the pin through the skirt of a piston in an internal-combustion engine, to which the little end of the connecting rod is attached Also called (esp in Britain)gudgeon pin

First recorded in 1870–75

Upon A-7a and A-5a engines a small tube supplies oil from connecting rod bearing directly upon the wrist pin.

The wrist pin member is a simple cylindrical element that fits the bosses closely, and it may be either hollow or solid stock.

If the wrist pin was free to move it would work out of the bosses enough so that the end would bear against the cylinder wall.

The outer brass is adjustable, being forced toward the wrist-pin by a sliding wedge which is operated by one or more set-screws.

The other end of the walking-beam is operated by a pitman shaft connecting with a crank wrist pin near the ground.

April 24, 2024gallimaufry

[gal-uh-maw-free ]

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