The FARR Coupling is employed whenever a rigid connection is required between the lower pace shaft of a gearbox plus 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, bodyweight of gearbox, motor and swing plate. While in the case of the mixer, it will carry the weight on the shaft and impeller, thrust forces and resulting bending moments.
Parts of a FARR Coupling include male and female piloted hubs created from 4140 alloy steel. The hubs are extended to assure 80% hub to shaft make contact with. Keeper plates are incorporated for safety. The 2 hubs are assembled with Grade 8 bolts and Grade À Prevailing Torque nuts. Common coupling sizes have a nominal torque vary from 11,300 to five,736,000 in-lbs. Greater sizes can be found based upon the application.
Capabilities
Heat Treated 4140 alloy steel
Male and Female pilots
Elevated Torque Capability
Grade eight Bolts / Grade ?¡ãC?¡À Prevailing Torque Nuts
Extended length as a result of bore
Keeper Plate design
FARR Coupling Choice Manual
A. Obtain The next Information and facts:
Application
Horsepower & RPM
Gearbox (Reducer) Ratio
Output Pace
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 Layout 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 capacity on the coupling will meet the application shaft requirements.
F.The Male pilot hub to always be utilised about the Reducer (Gearbox or Driver) shaft along with the Female pilot hub to always be utilised within the Head (Driven) shaft.
G.Drive System Analysis must be performed by Application Engineering to verify coupling choice.