It is used to transfer torque between two parallel but not collinear shafts.
Depending upon the matterial of the 3 discs , oldham coupling can be used in many devices. They can easily be used in servo mechanisms.
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Application of Oldhams coupling
It was basically invented to connect two parallel non co axial shafts.
It is a really good mechanism and transmits the same speed and same direction of rotation.
It is not of much importance now as gears are being used.
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There are many like flexible coupling, jaw coupling, sleeve coupling, tire coupling, pin and bush coupling, rigid coupling, etc
A Thompson Coupling is a High RPM, High angle, constant velocity joint between to turning shafts. The TC is used in a wide range of applications from the automotive industry, trains and on the rotor shaft of helicopters.
no.transformer coupling gives higher gain
Direct coupling