Mechanism

Mechanism is a concept or system of parts working together in a machine or process. It can refer to the underlying technology or process of a machine or technological device. It can also refer to a natural or established process by which something takes place or is brought about.

Overview

A mechanism is a structure that uses power to achieve a planned outcome. In the context of machinery, it is the element of a machine which contains two or more pieces arranged so that the motion of one compels the motion of the others. Generally, the term is used to describe simple mechanical devices such as gears and linkages, but it can also describe the theory of machines.

Mechanisms are generally classified as gears and gear trains, which includes belt drives and chain drives, cam and follower mechanisms, and linkages, though there are other special mechanisms such as clamping linkages, indexing mechanisms, escapements and friction devices such as brakes and clutches.

Types of Mechanisms

Gears and Gear Trains

A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part to transmit torque. A gear train is a mechanical system formed by mounting gears on a frame so the teeth of the gears engage.

Cam and Follower Mechanisms

A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion or vice versa. A follower is a mechanical component concerning which the cam moves in direct contact.

Linkages

A linkage is a collection of links connected by joints. Generally, the links are the structural elements and the joints allow movement. Perhaps the single most useful example is the planar four-bar linkage.

See Also

• Machine (mechanical)
• Simple machine
• Mechanical system
• Mechanical advantage

References

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