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How to Choose Between R, F, K and S Gearboxes
R, F, K and S are best understood as four mechanical layout families rather than four levels of the same gearbox. Start with shaft arrangement, then select power, ratio, torque, duty and mounting details.
Quick technical comparison
R Series
| Attribute | Value |
|---|---|
| Type | Helical Gear Unit |
| Shaft arrangement | Coaxial / Inline |
| Size range | R17–R177 |
| Reference power | 0.12–200 kW |
| Reference ratio | 3.06–285.61 |
| Reference maximum torque range | 85–32000 Nm |
F Series
| Attribute | Value |
|---|---|
| Type | Parallel Shaft Helical Gear Unit |
| Shaft arrangement | Parallel Shaft |
| Size range | F37–F167 |
| Reference power | 0.12–200 kW |
| Reference ratio | 3.70–281.71 |
| Reference maximum torque range | 200–32000 Nm |
K Series
| Attribute | Value |
|---|---|
| Type | Helical-Bevel Gear Unit |
| Shaft arrangement | Right Angle |
| Size range | K37–K187 |
| Reference power | 0.12–200 kW |
| Reference ratio | 3.73–210.00 |
| Reference maximum torque range | 200–50000 Nm |
S Series
| Attribute | Value |
|---|---|
| Type | Helical-Worm Gear Unit |
| Shaft arrangement | Right Angle |
| Size range | S37–S97 |
| Reference power | 0.12–22 kW |
| Reference ratio | 7.75–307.88 |
| Reference maximum torque range | 92–4000 Nm |
What should decide the selection?
1. Shaft arrangement
Choose the family that naturally fits the machine geometry. Avoid adding couplings or transfer shafts only to force an unsuitable gearbox layout.
2. Required output speed and ratio
Calculate the target ratio from actual input speed and process output speed. Then confirm the ratio exists in a valid performance row for the selected size.
3. Output torque and duty
Compare continuous duty, service factor, shock loading and external shaft loads. A larger reference maximum torque does not mean every configuration can operate continuously at that value.
4. Output and mounting interface
Solid shaft, hollow shaft, flange and shrink-disc arrangements can change replacement compatibility even when the base size is similar.
5. Maintenance and installation
Mounting position affects lubrication. Replacement work also requires dimensional confirmation against the existing machine.
Selection rule of thumb
Use the comparison to choose the gearbox family, then use the series selection table to choose the configuration.
Related products & technical resources
Precisa de uma configuração de redutor para sua máquina?
Envie a potência do motor, a velocidade de entrada, a velocidade de saída ou relação alvo, o torque de saída esperado, a disposição de montagem e qualquer desenho de instalação disponível. A CHINFAR pode usar essas informações para estreitar a configuração R/F/K/S antes da confirmação final de engenharia.
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