Nicolini & C: hollow shaft motors engineered to last
Nicolini & C hollow shaft motors adopt a single-bearing configuration and precision machining carried out in-house, with tight tolerances and guaranteed concentricity.
This architecture avoids mechanical overloads and ensures:
- Natural alignment between motor and pump
- Reduced bearing wear
- Increased long-term reliability
The Nicolini & C hollow shaft transmits torque efficiently while allowing the system to self-adjust, preventing unwanted mechanical constraints.
When simplicity is deceptive
The direct coupling between motor and pump through a hollow shaft is a seemingly simple solution, but it can lead to cost-cutting choices that compromise quality, typically:
- Generous tolerances
- Non-ground shafts
To address the inevitable issues, some manufacturers add a second front bearing to the hollow shaft, presenting it as an added safety measure.
In reality, this is the wrong solution to a problem that shouldn't exist: it creates overlapping mechanical constraints, where the two bearings — motor and pump — “fight” each other to maintain their own axis.
The resulting micro-misalignments turn into unwanted radial and axial loads, which ultimately affect the pump as well, significantly reducing the life of its bearing and compromising the overall reliability of the system.
Explore our solutions for high-pressure pumps.