Scotch Yoke Mechanism: Simple Way to Convert Rotary Motion into Smooth Reciprocating Movement

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The Scotch Yoke mechanism is a brilliant mechanical system designed to convert rotary motion into smooth reciprocating motion. It uses a slotted yoke connected to a piston, and a rotating disc with an off-center pin that slides within the yoke’s slot. As the disc rotates, the pin moves in a circular path, forcing the yoke to slide back and forth in a straight line.

This mechanism is known for its simplicity, compact design, and ability to produce a pure sinusoidal motion, making it ideal for applications like steam engines, air compressors, and certain automation systems. Compared to a traditional crank-slider mechanism, the Scotch Yoke offers fewer parts and smoother operation, but it can experience higher wear at the pin-slot contact point.

This animation demonstrates how efficiently the Scotch Yoke converts rotary input into linear output—perfect for engineering enthusiasts and learners looking to understand motion transformation mechanisms.