The FARR Coupling is utilized whenever a rigid connection is needed between the reduced speed shaft of the gearbox as well as head shaft of the 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. In the case of the mixer, it can carry the bodyweight of the shaft and impeller, thrust forces and resulting bending moments.
Components of a FARR Coupling consist of male and female piloted hubs made from 4140 alloy steel. The hubs are extended to assure 80% hub to shaft get hold of. Keeper plates are incorporated for safety. The two hubs are assembled with Grade eight bolts and Grade À Prevailing Torque nuts. Conventional coupling sizes have a nominal torque range from 11,300 to five,736,000 in-lbs. Bigger sizes can be found dependant upon the application.
Characteristics
Heat Treated 4140 alloy steel
Male and Female pilots
Greater Torque Capacity
Grade 8 Bolts / Grade ?¡ãC?¡À Prevailing Torque Nuts
Extended length as a result of bore
Keeper Plate style
FARR Coupling Choice Guide
A. Obtain The following Information and 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 Torque by applying 2.0 Service Factor to application torque.
D.Select coupling with a torque capability equal to or greater than the Style and design Torque from the Performance Data table.
E.Verify that the Bore capacity with the coupling will meet the application shaft requirements.
F.The Male pilot hub to always be utilized to the Reducer (Gearbox or Driver) shaft and the Female pilot hub to always be employed on the Head (Driven) shaft.
G.Drive System Analysis must be performed by Application Engineering to verify coupling selection.