Gearbox Selection
Planetary Gearboxes

High Torque Capacity: Planetary gearboxes offer a high torque-to-weight ratio due to their compact size and efficient distribution of load across multiple planet gears. This makes them suitable for handling the high torque requirements of positive displacement pumps, especially under pulsation conditions.
Smooth Operation: The design of planetary gearboxes ensures smooth operation with minimal vibration, which is beneficial in pulsating applications. The balanced distribution of forces can help mitigate the impact of pulsation on the gearbox and the pump system.
Compact and Durable: The compactness and durability of planetary gearboxes make them ideal for applications where space is limited and reliability is critical. Their robust construction can withstand the stresses caused by pulsation.
Helical Gearboxes

Quiet Operation: Helical gearboxes are known for their quiet operation due to the angled teeth, which engage more gradually than straight-cut gears. This characteristic can help reduce noise levels in systems affected by pulsation.
High Efficiency: The design of helical gears allows for a more constant tooth engagement, leading to higher efficiency and smoother transmission of power. This efficiency can be particularly advantageous in managing the fluctuating loads caused by pulsation in positive displacement pumps.
Durability under Load: Helical gearboxes can handle high axial and radial loads, making them suitable for applications with significant pulsation. The angled teeth provide increased surface contact, which distributes the load more evenly and enhances the gearbox’s durability.
Considerations for Selection
Torque and Speed Requirements: Evaluate the specific torque and speed reduction or increase requirements of your positive displacement pump, considering the impact of pulsation. Both planetary and helical gearboxes can offer high torque capacities, but the choice may depend on the precise operational needs and space constraints.
Vibration and Noise Levels: Consider the importance of minimizing vibration and noise in your application. Helical gearboxes might be preferred for quieter operation, while planetary gearboxes offer high durability and efficiency in a compact form factor.
Maintenance and Serviceability: Maintenance needs can vary between gearbox types. Planetary gearboxes, while compact and efficient, may require more careful maintenance due to their complex internal structure. Helical gearboxes might offer easier access for routine maintenance tasks.
Cost Considerations: Finally, evaluate the cost implications of each gearbox type. Planetary gearboxes might have a higher upfront cost but offer greater efficiency and torque density. Helical gearboxes could provide a cost-effective solution with the benefit of quieter operation and good efficiency.
When selecting a gearbox for a positive displacement pump with pulsation, it’s crucial to work closely with manufacturers and provide them with detailed operational conditions. This collaboration ensures that the chosen gearbox—whether planetary, helical, or another type—meets the specific requirements of your application, enhancing the pump’s performance and longevity.