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Physics
Mechanical Engineering
Fluid Dynamics

How is rotary motion transferred into linear motion?

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December 04, 2010 10:40AM

"Think of a simple single cylinder engine....crankshaft goes round & round,piston goes up & down,connecting rod keeps the two tied together...wa la!"

This type of linear motion is known as reciprocating motion, where the linear motion is a repetitive up and down, or back and forth action.

The linear motion velocity of a wheel and crank system is not uniform and conforms to a sinusodial curve, i.e. it is slowest at the 0º and 180º positions and fastest at the 90º position.

To get uniform linear motion from uniform rotary motion, you can use a threaded shaft and thread follower arrangement, or a rack and pinion.

btw, it's "voila!".