February 19, 2021

Jaw Style Coupling Selection Approach
The variety process for determining the appropriate jaw coupling size and elastomer demands making use of the charts shown to the following pages. There are actually 3 parts to be chosen, two hubs and a single elastomer. Once the shaft size on the driver and driven on the application are of your similar diameter, the hubs selected are going to be exactly the same. When shaft diameters vary, hubs chosen will differ accordingly.
Information and facts vital prior to a coupling is often picked:
HP (or KW) and RPM or Torque of driver
Shaft sizes of driver and driven equipment and corresponding keyways
Application description
Environmental conditions (i.e. excessive temperature, corrosive conditions, area limitations)
Methods In Selecting A Jaw Coupling
Step 1: Determine the Nominal Torque of one’s application through the use of the following formula:
Nominal Torque = in-lb = (HP x 63025)/RPM
Nm = (KW x 9550)/RPM
Phase 2: Working with the Application Service Things Chart 1 decide on the services factor which very best corresponds to your application.
Step three: Determine the Design Torque of your application by multiplying the Nominal Torque calculated in Step 1 through the Application Support Element determined in Step 2.
Design and style Torque = Nominal Torque x Application Support Element
Step 4: Using the Spider Performance Data Chart 2, decide on the elastomer materials which best corresponds to your application.
Phase five: Utilizing the Jaw Nominal Rated Torque Chart 3 , locate the ideal elastomer material column for that elastomer chosen in Stage 4.
Scan down this column to your initial entry where the Torque Worth within the proper column is greater than or equal to the Style and design Torque calculated in Phase 3.
When this worth is located, refer on the corresponding coupling size from the first column in the Jaw Nominal Rated Torque Chart 3 .
Refer to the greatest RPM value for this elastomer torque capability to make sure the application needs are met. In case the necessity is just not content at this point, an additional form of coupling could possibly be expected for your application. Please talk to Lovejoy engineering for help.
Phase 6: Examine the application driver/driven shaft sizes to your maximum bore dimension obtainable within the coupling chosen. If coupling bore size just isn’t large ample for the shaft diameter, pick the next greatest coupling which will accommodate the driver/driven shaft diameters.
Stage 7: Utilizing the UPC amount choice table , obtain the proper Bore and Keyway sizes necessary and locate the amount.