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Dog (engineering)
In engineering a dog is a tool that prevents movement or imparts movement by offering physical obstruction or engagement of some kind. It may hold another object in place by blocking it, clamping it, or otherwise obstructing its movement. Or it may couple various parts together so that they move in unison - the primary example of this being a flexible drive to mate two shafts in order to transmit torque. Some devices use dog clutches to lock together two spinning components. In a manual transmission, the dog clutches, or "dogs" lock the selected gear to the shaft it rotates on. Unless the dog is engaged, the gear will simply freewheel on the shaft.
This word usage is a metaphor derived from the idea of a dog (animal) biting and holding on, the "dog" name derived from the basic idea of how a dog jaw locks on, by the movement of the jaw, or by the presence of many teeth. In engineering the "dog" device has some special engineering work when making it – it is not a simple part to make as it is not a simple bar or pipe, and the metal used in its construction is likely to be special rather than regular steel.
There is potential for confusion as "dog tensioners" are levers which are named due to the shape of the lever appearing as a dog leg, as the lever is in a pantograph arrangement, or "dog trailers" which are named due to the use of multiple trailers for transporting animal cages.
==Subtypes and examples of applications==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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