Steps In Choosing A Disc Coupling

The following is usually a sample application employed to illustrate the standard course of action for deciding on a Disc coupling. Any resemblance to any current company?¡¥s application is neither intentional nor meant to resemble that company?¡¥s real application.
Sample Application:
An organization features a compressor application working with a 225 horsepower electrical motor operating at one,150 RPM to drive a three cylinder multi stage reciprocating air compressor. The electric motor features a 3-3/8 inch shaft with a 7/8 inch keyway and also the compressor features a 92mm shaft having a 25mm keyway. The shaft separation is approximately 7 inches among shaft ends with some skill to alter the motor area. The shafts have a parallel misalignment/offset of approximately 1/32 of an inch.
Phase 1: The initial step would be to determine what coupling kind is always to be picked for this application. Since the SU Type coupling only supports
a single flex plane, it may only accommodate angular and axial misalignment, but not parallel misalignment. The following preference could be to search at an SX or DI Style coupling. The 6 bolt SX Kind will accommodate both parallel misalignment along with the defined shaft separation. The dimension are going to be established through the variety torque as well as the shaft diameters.
Stage 2: Up coming, calculate the application torque and apply the support component to determine 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 inside the numbers from the application description:
Application Torque ( in-lbs ) =(HP x 63025)/RPM = (225 x 63025)/1150 = twelve,331 in-lbs
Application Torque x Support Factor = Variety Torque
twelve,331 in-lbs x 3.0 = 36,993 in-lbs
Step three: Utilize the SX coupling tables and note the SX 202-6 is rated at 40,700 in-lbs, in excess of sufficient to deal with the assortment torque calculated in stage two. The SX202-6, even so, won’t support the 92mm shaft dimension. The subsequent more substantial size coupling, the SX228-6, will support the 92mm shaft size as well as shaft separation dimension (BSE) is 6.88 inches, extremely close to the application?¡¥s preferred seven inch separation. The SX228-6 is rated at 62,000 in-lbs which may perhaps seem to be excessive, nonetheless, the coupling dimension is important to deal with the bore size.
Phase 4: The SX228-6 coupling is rated to get a highest unbalanced pace of three,400 RPM, more than enough to support the application speed of one,150 RPM.
Phase five: To find out if your coupling will take care of the parallel misalignment, use the trig function of tan 1?? = offset allowed for 1 inch = 0.0174
Multiply the 0.0174 x the distance amongst disc packs or ??S?¡¥ dimension through the table on webpage D-13, or 5.50 inches.
The allowable parallel offset is 0.0174 x 5.50 = 0.096 inches. The maximum offset for your application is 1/32 inches (0.031), therefore this coupling can accommodate the parallel misalignment.
Note: It is often suggested to seek to install the coupling at approximately 20% with the allowable misalignment. For this coupling the installer ought to make an effort to obtain much better than 0.020 parallel misalignment on the time of installation. This can make it possible for for your supplemental misalignment which will occur because the result of tools settle and general gear put on.


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