Gearbox Power

Angular velocity multiplied by presented torque gives shaft power.

In order to specifiy a gearbox one would need also:

• its configuration,
• mounting arrangements,
• dimensions,
• shaft sizes,
• shaft connection details

and a host of other things that are best discussed with gearbox suppliers directly by telephone. Naturally, one would review a quantity of their documentation before selecting the correct one for the job.

so there is no meaning of "max power" for a gearbox?

They usually are rated for maximum input power at a certain rpm, and maximum output torque.

In a way, for simple gearboxes, there is a "max power" rating. Since a portion of the power transmitted is lost as heat due to friction, the maximum power is limited by the amount of heat which the gearbox can reject before high internal temperature causes degradation of the components and lubricant. As Tornado alluded, there is also a maximum static torque which the gearbox can withstand before something breaks.

Then there is consideration of wear and fatigue - generally, less stress/torque applied gives more revolutions/longer life. So there is a speed-torque relationship, which for simple gearboxes is accounted for in the power rating. Staying under a) the max power rating, b) max torque rating, and c) the max RPM rating should give a rated design life.

• Model
• Serial #
• Customer Po# for referancing BOM / Orginal Designs
• Ratio
• Input R.P.M ( Max )
• Rating ( Thermal )
• S.F. Service Factor
• Lube Specs ( Agma )
• Manufacturers Address and contact Number