Radial Force Imbalance in Gear Pumps

1.What Is Radial Force Imbalance?

Radial force imbalance refers to the uneven radial hydraulic pressure acting on the gears and bearings of a gear pump. This unbalanced force pushes the gears toward one side of the pump housing instead of keeping them evenly loaded.

2.How Does Radial Force Imbalance Occur?

In a gear pump, fluid pressure is not uniformly distributed around the gear circumference: The high-pressure zone is located near the outlet side The low-pressure zone is near the inlet side Pressure gradually increases along the meshing region This pressure gradient creates a net radial force acting in one direction, resulting in imbalance.

3.Main Causes of Radial Force Imbalance

①Asymmetric Pressure Distribution

High outlet pressure and low inlet pressure generate unequal hydraulic forces on the gear teeth and shafts.

②Fixed Displacement Gear Design

Conventional gear pumps lack pressure-balancing mechanisms, making imbalance unavoidable.

③High Operating Pressure

As system pressure increases, the magnitude of radial force rises proportionally.