Mechanical Principle What are mechanisms, machines and machinery?

Machinery is a variety of devices composed of mechanics and other principles. All kinds of machines, gears, guns and so on are machines.

A machine is a device assembled by various metal and nonmetal parts, which consumes energy and can work. It is used to replace human labor, transform energy and produce useful work.

A mechanism is a component system formed by two or more components through movable connection. According to the difference of relative motion between components, mechanisms can be divided into planar mechanisms (such as planar linkage mechanism and cylindrical gear mechanism). ) and spatial mechanisms (such as spatial linkage, worm gear and worm mechanism, etc. ). According to the type of kinematic pair, it can be divided into low pair mechanism (such as linkage mechanism) and high pair mechanism (such as cam mechanism). According to the structural characteristics, it can be divided into connecting rod mechanism, gear mechanism, inclined plane mechanism, ratchet mechanism and so on. According to the characteristics of the converted motion or force, it can be divided into uniform and non-uniform rotation mechanisms, linear motion mechanisms, reversing gears, intermittent motion mechanisms and so on. According to the function, it can be divided into safety insurance mechanism, interlocking mechanism and escapement mechanism.