®How to Calculate Gear Ratio and Output Speed
For a simple reduction gearbox, output speed is approximately input speed divided by the transmission ratio. This relationship is also a powerful QA check when reading a gearbox selection table.
Basic equations
i = n₁ / n₂
n₂ = n₁ / i
Where n₁ is input speed, n₂ is output speed and i is reduction ratio.
Example
With 1450 rpm input and ratio 28.37, the theoretical output speed is about 51.1 rpm. Small differences in published tables can result from rounding or the actual rated motor speed used.
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
Related products & technical resources
Need a gearbox configuration for your machine?
Send the required motor power, input speed, target output speed or ratio, expected output torque, mounting arrangement, and any installation drawing available. CHINFAR can use these inputs to narrow the R/F/K/S configuration before final engineering confirmation.
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