Methods In Selecting A Disc Coupling

The next is a sample application utilized to illustrate the conventional approach for picking 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:
An organization has a compressor application using a 225 horsepower electric motor working at 1,150 RPM to drive a three cylinder multi stage reciprocating air compressor. The electric motor features a 3-3/8 inch shaft by using a 7/8 inch keyway as well as the compressor includes a 92mm shaft using a 25mm keyway. The shaft separation is roughly seven inches amongst shaft ends with some capacity to change the motor area. The shafts have a parallel misalignment/offset of approximately 1/32 of an inch.
Phase one: The initial step is to establish what coupling style would be to be chosen for this application. Since the SU Sort coupling only supports
a single flex plane, it could only accommodate angular and axial misalignment, but not parallel misalignment. The subsequent decision will be to appear at an SX or DI Form coupling. The six bolt SX Type will accommodate each parallel misalignment and the defined shaft separation. The size will be determined from the variety torque and the shaft diameters.
Step 2: Up coming, calculate the application torque and apply the support aspect to determine the assortment torque.The formula employed to calculate torque is as follows:
Application Torque ( in¡§Clb ) = ( HP x 63025 )/RPM
or Nm = ( KW x 9550)/RPM
Plugging in the numbers from your application description:
Application Torque ( in-lbs ) =(HP x 63025)/RPM = (225 x 63025)/1150 = twelve,331 in-lbs
Application Torque x Support Issue = Assortment Torque
twelve,331 in-lbs x 3.0 = 36,993 in-lbs
Stage 3: Make use of the SX coupling tables and note that the SX 202-6 is rated at forty,700 in-lbs, a lot more than ample to manage the selection torque calculated in stage 2. The SX202-6, however, won’t help the 92mm shaft size. The following greater size coupling, the SX228-6, will support the 92mm shaft dimension as well as shaft separation dimension (BSE) is six.88 inches, really near to the application?¡¥s preferred 7 inch separation. The SX228-6 is rated at 62,000 in-lbs which may well seem to be extreme, even so, the coupling dimension is necessary to manage the bore dimension.
Phase 4: The SX228-6 coupling is rated for a optimum unbalanced velocity of 3,400 RPM, more than enough to assistance the application velocity of one,150 RPM.
Stage 5: To determine if your coupling will manage the parallel misalignment, use the trig function of tan 1?? = offset permitted for 1 inch = 0.0174
Multiply the 0.0174 x the distance among 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 5.50 = 0.096 inches. The maximum offset for the application is 1/32 inches (0.031), consequently this coupling can accommodate the parallel misalignment.
Note: It truly is generally proposed to make an effort to set up the coupling at approximately 20% of the allowable misalignment. For this coupling the installer should try to achieve far better than 0.020 parallel misalignment with the time of set up. This may make it possible for for the further misalignment that should occur as the outcome of products settle and general tools dress in.


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