The FARR Coupling is made use of whenever a rigid connection is required amongst the very low speed shaft of the gearbox along with 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 a mixer, it is going to carry the fat in the shaft and impeller, thrust forces and resulting bending moments.
Elements of the 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 incorporated for safety. The 2 hubs are assembled with Grade eight bolts and Grade À Prevailing Torque nuts. Common coupling sizes have a nominal torque vary from eleven,300 to 5,736,000 in-lbs. Greater sizes can be found dependant upon the application.
Characteristics
Heat Treated 4140 alloy steel
Male and Female pilots
Elevated Torque Capability
Grade eight Bolts / Grade ?¡ãC?¡À Prevailing Torque Nuts
Extended length via bore
Keeper Plate layout
FARR Coupling Selection Guidebook
A. Obtain The following 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 and style 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 used to the Reducer (Gearbox or Driver) shaft and the Female pilot hub to always be used on the Head (Driven) shaft.
G.Drive System Analysis must be performed by Application Engineering to verify coupling choice.