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What Is Gearbox Service Factor?

Service factor is a selection margin used to account for duty severity beyond nominal power and torque. It should be considered with operating hours, starts, shock load and driven-machine behavior.

What changes the required service factor?

• Daily operating hours
• Number of starts and stops
• Smooth, moderate or shock-loaded duty
• Driven-machine inertia
• Reversing or cyclic operation
• Ambient and process conditions

Selection mistake to avoid

Do not choose a gearbox because its nominal torque barely equals the calculated load. The selection should reflect the actual duty and required margin.

How this applies to R, F, K and S gear units

The same engineering principle applies across the CHINFAR four-series platform, but the mechanical layout changes: R is inline/near-inline, F is parallel-shaft, and K/S are right-angle families. Use the principle to define the requirement, then select a configuration within the appropriate family.

Related product families

• R Series Helical Gear Unit
• F Series Parallel Shaft Helical Gear Unit
• K Series Helical-Bevel Gear Unit
• S Series Helical-Worm Gear Unit