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Unformatted text preview: n. To
form a mechanism from a kinematics chain one of the links must be fixed. However as
any of the links can be fixed, it follows that there are as many mechanisms as there are
links in the chain. The technique of obtaining different mechanisms by fixing the various
links in turn is known as inversion. Kinematics Pairs
The relative motion between two links of a pair can take different forms. Three types of
pairs are known as lower pairs and these are the frequently occurring ones:Sliding : such as occurs between a piston and cylinder. Turning : such as occurs with the wheel on an axle. Screw motion : such as occurs between a nut and a bolt. Universiti Tenaga Nasional, 2006
Mechanical Design and CAD Laboratory All other cases are considered to be combinations of sliding and rolling and are called
higher pairs. Strictly screw motion is a higher pair as it combines turning and sliding. Slider – Crank Mechanism
The slider – crank mechanism is well known as the basis of a reciprocating engine....
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This document was uploaded on 03/08/2014 for the course INDUSTRIAL theory of at University of Florida.
- Spring '14