Measures In Deciding on A Disc Coupling

The following is usually a sample application utilized to illustrate the standard method for selecting a Disc coupling. Any resemblance to any current company?¡¥s application is neither intentional nor meant to resemble that company?¡¥s actual application.
Sample Application:
A company features a compressor application making use of a 225 horsepower electrical motor running at 1,150 RPM to drive a three cylinder multi stage reciprocating air compressor. The electric motor includes a 3-3/8 inch shaft with a 7/8 inch keyway and the compressor features a 92mm shaft by using a 25mm keyway. The shaft separation is roughly 7 inches involving shaft ends with some means to alter the motor place. The shafts have a parallel misalignment/offset of roughly 1/32 of an inch.
Step 1: The 1st step would be to establish what coupling type is to be chosen for this application. Since the SU Kind coupling only supports
a single flex plane, it might only accommodate angular and axial misalignment, but not parallel misalignment. The next alternative can be to appear at an SX or DI Type coupling. The six bolt SX Kind will accommodate both parallel misalignment as well as the defined shaft separation. The dimension will probably be determined by the selection torque along with the shaft diameters.
Phase two: Up coming, determine the application torque and apply the services component to calculate the variety torque.The formula utilized to calculate torque is as follows:
Application Torque ( in¡§Clb ) = ( HP x 63025 )/RPM
or Nm = ( KW x 9550)/RPM
Plugging in the numbers in the application description:
Application Torque ( in-lbs ) =(HP x 63025)/RPM = (225 x 63025)/1150 = 12,331 in-lbs
Application Torque x Support Element = Assortment Torque
twelve,331 in-lbs x three.0 = 36,993 in-lbs
Step 3: Make use of the SX coupling tables and note the SX 202-6 is rated at forty,700 in-lbs, in excess of sufficient to handle the variety torque calculated in phase two. The SX202-6, on the other hand, will not support the 92mm shaft size. The following greater dimension coupling, the SX228-6, will assistance the 92mm shaft dimension and also the shaft separation dimension (BSE) is 6.88 inches, extremely near to the application?¡¥s preferred 7 inch separation. The SX228-6 is rated at 62,000 in-lbs which could appear to be extreme, nonetheless, the coupling dimension is critical to handle the bore dimension.
Stage 4: The SX228-6 coupling is rated for any highest unbalanced pace of three,400 RPM, in excess of adequate to assistance the application pace of 1,150 RPM.
Stage 5: To determine in case the coupling will handle the parallel misalignment, make use of the trig function of tan 1?? = offset allowed for one inch = 0.0174
Multiply the 0.0174 x the distance amongst disc packs or ??S?¡¥ dimension from your table on web page D-13, or five.50 inches.
The allowable parallel offset is 0.0174 x five.50 = 0.096 inches. The maximum offset to the application is 1/32 inches (0.031), therefore this coupling can accommodate the parallel misalignment.
Note: It’s always suggested to make an effort to set up the coupling at roughly 20% of the allowable misalignment. For this coupling the installer ought to make an effort to accomplish improved than 0.020 parallel misalignment in the time of set up. This will permit for your additional misalignment that could come about since the consequence of products settle and basic gear put on.

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