BUSH TYPE FLEXIBLE COUPLING SELECTION

The function of a flexible pin bush coupling is to transmit torque from one shaft to another where limited misalignment may occur and also to absorb shock loads.

The PARAS PIN Bush Type Flexible Coupling of the cushioned drive type, transmits the torque through high tensile steel bolts to the input shaft. Highly developed rubber compounds are used in bushes to absorb shock loads, torsional vibrations and slight misalignments.

Simple and compact in construction, the PARAS PIN BUSH Coupling is capable of transmitting high torques at maximum speeds. The flanges are manfactured with cast iron, grade 25 of IS, 210. This type of coupling permits drive in either drive in either direction and requires neither librication nor adjustment after fitting. The flexible bushes remain unaffected by water, dust and atmospheric conditions.

Machines which are to be coupled by flexible couplings should first be aligned with all possible accuracy. The capacity of the coupling will then deal with misaligments which occur by reason of temperature variations or heavy shaft loading. Setting of machine foundations or bearing wear will also cause extra loading to be imposed on the coupling. Any, or all of these conditions can occur once the machines have been coupled.

Flages are bored to suit requirments and are keywayed to I. S. Specification, unless otherwise stated. They can also be supplied with the listed minimum bore to permit machining on site.

1. Type of driven machine and operating hours per day.
2. Speed and power absorbed by driven machine. (If absorbed power is not know, it is calculated based on power rating of the prime mover)
3. Diameter of shafts to be connected.

1. Service Factor
   Determine the required service factor from Table A
2. Design Power
   Multiply the normal running power by the service factor. This gives the Design Power which is used as a basis for selecting the
   coupling.
3. Coupling Size
   Refer to Table C and from the appropriate speed read across until a power greater than that required in step (2) is found. The
   size of coupling required is given at the head of the table.
4. Bore Size
   Check from dimension in Table B, whether the chosen flanges can accommodate the required bores.

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