CB series gear pumps are external gear pumps widely used in basic hydraulic systems.
They are valued for simple structure, low cost, and stable flow, making them ideal for low-pressure applications.
CB gear pumps typically feature:
Plain bearings (sliding bearings)
Fixed displacement design
Larger internal clearances
No axial or radial pressure compensation
These characteristics directly influence their pressure capability.
CB pumps usually use sliding bearings, which have limited load-bearing capacity.
At high pressure, radial forces on the gear shafts increase significantly, accelerating bearing wear and leading to early failure.
CB gear pumps do not include axial or radial compensation mechanisms.
As pressure rises, internal clearances cannot be automatically adjusted, resulting in rapid efficiency loss and wear.
Higher system pressure increases internal leakage through:
Gear side clearances
Gear tooth meshing gaps
This causes:
Reduced volumetric efficiency
Increased heat generation
Unstable system performance
The pump housing of CB series pumps is designed for low to medium pressure levels.
Operating beyond rated pressure may cause:
Deformation of the pump body
Increased noise and vibration
Risk of structural damage
CB series gear pumps are commonly used in:
Agricultural machinery
Small hydraulic power units
Low-pressure lifting systems
Simple industrial equipment
Recommended working pressure: typically ≤ 16 MPa (depending on model).
