Hydrodynamic and rolling bearings

Everything related to Machine problems, Balancing issues, Vibration / Thrust diagnostics & analysis, etc.
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novice123
Posts: 107
Joined: 24 Jul 2010, 18:32
Area of interest: Petroleum Engineering

Hydrodynamic and rolling bearings

Post by novice123 »

What is the major difference between hydrodynamic & rolling bearings?
Which one is used in which application?
opo21
Posts: 8
Joined: 22 Dec 2025, 08:14
Area of interest: Chemical Engineering

Re: Hydrodynamic and rolling bearings

Post by opo21 »

Hydrodynamic bearings use a thin film of fluid (like oil) to separate moving surfaces, reducing friction.
Roller bearings use rolling elements (balls or rollers) to reduce friction.
Hydrodynamic bearings are often more robust against external factors.

The primary difference lies in how they handle friction. Hydrodynamic bearings rely on fluid lubrication, while roller bearings use rolling elements. The choice between them depends on factors like load, speed, operating environment, and desired lifespan.

Hydrodynamic bearings are often preferred in applications with high loads and speeds, while roller bearings are common in automotive and machinery applications.
novice123
Posts: 107
Joined: 24 Jul 2010, 18:32
Area of interest: Petroleum Engineering

Re: Hydrodynamic and rolling bearings

Post by novice123 »

We have a case where we are identifying the frequent failure of a finished product transportation through conveyors.
Now for such applications, what should be considerations to choose the type of bearings?
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