Watt's linkage

（重定向自Parallel linkage）

Hand-drawn diagram by James Watt (1808) in a letter to his son, describing how he arrived at the design.[1]

Figure 9 from James Watt's patent application (top left part) showing the straightline linkage

Watt's linkage as part of an automobile suspension

Watt's linkage (also known as the parallel linkage) is a type of mechanical linkage invented by James Watt (19 January 1736 – 25 August 1819) in which the central moving point of the linkage is constrained to travel on an approximation to a straight line. It was described in Watt's patent specification of 1784 for the Watt steam engine. It is also used in automobile suspensions, allowing the axle of a vehicle to travel vertically while preventing sideways motion.

单词	Parallel linkage
释义	Parallel linkage 英语百科 Watt's linkage （重定向自Parallel linkage） Watt's linkage (also known as the parallel linkage) is a type of mechanical linkage invented by James Watt (19 January 1736 – 25 August 1819) in which the central moving point of the linkage is constrained to travel on an approximation to a straight line. It was described in Watt's patent specification of 1784 for the Watt steam engine. It is also used in automobile suspensions, allowing the axle of a vehicle to travel vertically while preventing sideways motion.
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