Oldhams coupling
The Oldham’s coupling shown in figure is used to connect two parallel shafts, the distance between whose axes is small and variable. The shafts connected by the coupling rotates at the same speed. The shafts have flanges at the ends, in which slots are cut. These form links 1 and 3.
An intermediate piece circular in shape and having tongues at right angles on opposite sides, is fitted between the flanges of the two shafts in such a way that the tongues of the intermediate piece get fitted in the slots of the flanges. The intermediate piece forms link 4, which slides or reciprocates in links 1 and 3. The link 2 is fixed.
Maximum sliding speed of each tongue along at slot
= Distance between the axes of the shafts × angular velocity of each shaft ….(1.15)
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