mechanism engineering

mechanisms and simple machines

A mechanism, in engineering, is a device that transforms input forces and movement into a desired set of output forces and movement. Mechanisms generally consist of moving components that can include:

Gears and gear trains

Belt and chain drives

Cam and followers

linkage

Friction devices, such as brakes and clutches

Structural components such as a frame, fasteners, bearings, springs, lubricants

Various machine elements, such as splines, pins, and keys

The German scientist Reuleaux provides the definition "a machine is a combination of resistant bodies so arranged that by their means the mechanical forces of nature can be compelled to do work accompanied by certain determinate motion." In this context, his use of machine is generally interpreted to mean mechanism.

The combination of force and movement defines power, and a mechanism manages power to achieve a desired set of forces and movement.

A mechanism is usually a piece of a larger process or mechanical system. Sometimes an entire machine may be referred to as a mechanism. Examples are the steering mechanism in a car, or the winding mechanism of a wristwatch. Multiple mechanisms are machines.

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