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Tuesday, 10 June 2014

Flexible Coupling and it Types

Flexible Coupling and it Types Points : Flexible Coupling, types of Flexible Coupling, Definition Flexible coupling is use to connect the abut ends of shafts while they are not in precise alignment. In case of a direct coupled drive as of a prime mover to electric generator, we must include four bearings at a moderately secure distance. In such a case with in various others, as in a direct electric drive as of an electric motor to a machine tool, this coupling is use so as to allow an axial misalignment of shaft with no undue incorporation of power which shaft are transmit. Types of flexible couplings:
1. Universal (or Hooke’s) Coupling
2. Bushed-pin Flexible Coupling
3. Oldham Coupling
1. Universal (or Hooke’s) Coupling This coupling is use to attach two shafts whose axes cross at a small angle. Partiality of two shafts might be stable, but in definite practice, it varies as motion is transmit as of one shaft to another. Main function of universal or Hooke’s coupling is found in transmission as of gear box to discrepancy or back axle of automobiles. This coupling is too use for transmission of power to dissimilar spindles of multiple drilling machine. It is use as a knee joint in milling machines.
2. Bushed-pin Flexible Coupling This coupling is a alteration of rigid kind of flange coupling. Coupling bolts are identified as pins. Rubber and leather bushes are use above the pins. Two halves of couplings are different in creation. Clearance of 5 mm is left among face of two halves of coupling. There is no firm connection among them with drive takes place through average of compressible rubber and leather bushes. The design of bushed-pin flexible coupling, proportions of rigid type flange coupling is customized. Major alteration is to decrease bearing pressure on rubber and leather bushes with it must not exceed 0.5 N/mm2.
3. Oldham Coupling This couplings are a three piece devise contain of two aluminum hubs press fix onto a middle disk. Torque transmission is expert with mating slots on center disk to drive tenons on hubs. During process center disk slides on tenons of every hub to transmit torque. As the couplings contain a small quantity of angular and axial misalignment, they are particularly functional in purpose by parallel misalignment.

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