Scotch yoke

Mechanism to convert between rotational and reciprocating motion / From Wikipedia, the free encyclopedia

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The Scotch Yoke (also known as slotted link mechanism[1]) is a reciprocating motion mechanism, converting the linear motion of a slider into rotational motion, or vice versa. The piston or other reciprocating part is directly coupled to a sliding yoke with a slot that engages a pin on the rotating part. The location of the piston versus time is simple harmonic motion, i.e., a sine wave having constant amplitude and constant frequency, given a constant rotational speed.

Scotch_yoke_displacement.png
Comparison of displacement and acceleration for a Scotch yoke compared with a crank and slider
Yugo_Escoc%C3%A9s_-_Scotch_yoke_animation.gif
Scotch yoke animation