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How does a Scotch Yoke mechanism Work?
You can also visit a version of this mechanism with dwell in here.
The Scotch Yoke is a mechanism for 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 advantages compared to a standard crankshaft and connecting rod setup are:
High torque output with a small cylinder size.
Fewer moving parts.
Higher percentage of the time spent at top dead center (dwell) improving engine efficiency.
In an engine application, elimination of joint typically served by a wrist pin, and near elimination of piston skirt and cylinder scuffing, as side loading of piston due to sine of connecting rod angle is eliminated.
The disadvantages are:
Rapid wear of the slot in the yoke caused by sliding friction and high contact pressures.
Lesser percentage of the time spent at bottom dead center reducing blowdown time for two stroke engines.
The shape of the motion of the piston is a pure sine wave over time given a constant rotational speed.
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