The FARR Coupling is utilized whenever a rigid connection is needed concerning the minimal velocity shaft of the gearbox and the head shaft of a conveyor, bucket elevator, mixer or any over-hung or suspended load. When sized correctly, the FARR Coupling will carry the applica-tion torque, weight of gearbox, motor and swing plate. While in the situation of the mixer, it’s going to carry the weight of the shaft and impeller, thrust forces and resulting bending moments.
Elements of a FARR Coupling consist of male and female piloted hubs produced from 4140 alloy steel. The hubs are extended to assure 80% hub to shaft get in touch with. Keeper plates are included for safety. The 2 hubs are assembled with Grade eight bolts and Grade À Prevailing Torque nuts. Regular coupling sizes have a nominal torque vary from 11,300 to five,736,000 in-lbs. Larger sizes can be found depending on the application.
Characteristics
Heat Treated 4140 alloy steel
Male and Female pilots
Elevated Torque Capacity
Grade 8 Bolts / Grade ?¡ãC?¡À Prevailing Torque Nuts
Extended length through bore
Keeper Plate design and style
FARR Coupling Choice Manual
A. Obtain The next Data:
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 Design Torque by applying 2.0 Service Factor to application torque.
D.Select coupling with a torque capacity equal to or greater than the Design and 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 used on the Reducer (Gearbox or Driver) shaft along with the Female pilot hub to always be utilised around the Head (Driven) shaft.
G.Drive System Analysis must be performed by Application Engineering to verify coupling choice.