The Scotch yoke mechanism 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. As the crank rotates the pin slides inside the yoke and also moves the yoke forward. When the crank rotates through in clockwise direction the yoke will get a displacement in the forward direction. The maximum displacement will be equal to the length of the crank. When the crank completes the next of rotation the yoke comes back to its initial position.

Scotch-yoke-Mechanism-basic.jpg

Find out the possible application of this mechanism