Definition
The Scotch Yoke Mechanism is a mechanical device that converts rotary motion into linear motion, or vice versa. It consists of a slotted yoke and a pin-mounted disc. As the disc rotates, the pin slides within the yoke's slot, producing a linear movement. This mechanism is commonly used in engines, pumps, and valve actuators due to its simplicity and effectiveness.
Construction of the Mechanism
The main parts of the scotch yoke mechanism are as follows. You can use them to find scotch yoke mechanism dimensions or perform scotch yoke mechanism calculations.
- Crank: The crank rotates around the fixed link as its centre point and the sliding pin as its endpoint.
- Sliding pin: This sliding pin is a fixed link to the double slider crankshaft on the other side. It is also attached to a crank
- Sliding yoke: The sliding yoke has a slot that attaches to a sliding pin that slides inside the sliding yoke.
- Fixed Link: When the crank rotates around the fixed link, the sliding pin slides into the slot of the yoke, and the yoke slides forward and backwards.
- Connecting Rod or Piston: It achieves the output reprocessing motion of the scotch yoke mechanism. The piston or reciprocating part is added to a sliding yoke.
Skotch-Yoke Mechanism using SOLIDWORKS
Advantages
- Smaller cylinder capacity and higher torque output.
- Easy to assemble, operate, and build.
- Smoother operation due to fewer moving components.
- Engine efficiency is increased by a higher proportion of time spent at the top dead center.
- It can be easily automated.
Applications
- A double hack jaw
- It can be used to perform various operations like cutting, slotting, etc. on metal bars.
- Water Pumps.
- Reciprocating pumps.
- Double-ended saws
- Scotch yoke actuators are mechanical devices used to automatically open and close valves or dampers.
- It is used for gearless power transmission.
