The FARR Coupling is utilised when a rigid connection is needed between the low speed shaft of the gearbox and the head shaft of a conveyor, bucket elevator, mixer or any over-hung or suspended load. When sized effectively, the FARR Coupling will carry the applica-tion torque, excess weight of gearbox, motor and swing plate. While in the case of the mixer, it will carry the weight with the shaft and impeller, thrust forces and resulting bending moments.
Elements of a FARR Coupling include male and female piloted hubs produced from 4140 alloy steel. The hubs are extended to assure 80% hub to shaft make contact with. Keeper plates are incorporated for security. The two hubs are assembled with Grade eight bolts and Grade À Prevailing Torque nuts. Standard coupling sizes have a nominal torque vary from eleven,300 to five,736,000 in-lbs. Greater sizes can be found dependant upon the application.
Options
Heat Treated 4140 alloy steel
Male and Female pilots
Greater Torque Capacity
Grade eight Bolts / Grade ?¡ãC?¡À Prevailing Torque Nuts
Extended length by means of bore
Keeper Plate layout
FARR Coupling Choice Guidebook
A. Obtain The next Facts:
Application
Horsepower & RPM
Gearbox (Reducer) Ratio
Output Velocity
All Shaft Sizes
Overhang Load
Lever Arm
(Distance from end of Gearbox output Shaft to Center-Line of Gearbox or Center Line of Gravity)
B.Calculate Application Torque:
T (in-lb) = ¡ê¡§HP x 63025¡ê?/RPM
C.Calculate Style and design Torque by applying 2.0 Service Factor to application torque.
D.Select coupling with a torque capacity equal to or greater than the Style Torque from the Performance Data table.
E.Verify that the Bore capability with the coupling will meet the application shaft requirements.
F.The Male pilot hub to always be applied on the Reducer (Gearbox or Driver) shaft as well as the Female pilot hub to always be employed over the Head (Driven) shaft.
G.Drive System Analysis must be performed by Application Engineering to verify coupling assortment.