4.4.2 Bearing lifetime
The bearing lifetime is limited by material fatigue (fatigue service life) and/or lubrication failure
(grease service life). The fatigue lifetime (statistical bearing lifetime L
10h
) mainly depends the
mechanical load. The correlation is shown in the radial force/axial force diagrams. The values are
determined according to DIN/ISO 281.
The grease lifetime is mainly dependent on the bearing size, speed, temperature as well as
the vibrational load.
The grease lifetime can be extended by especially favorable operating conditions (low or
average speed, low bearing temperatures, low radial force or vibration load).
A reduction of the grease lifetime can be expected for dicult operating conditions and
when motors are mounted vertically.
Lifetime lubrication (without relubrication)
Note
For lifetime lubrication, the grease lifetime is harmonized with the bearing lifetime L
10h
.
Bearing change interval (t
LW
)
The recommended bearing change intervals are obtained from the inter-dependencies
mentioned above for a specic operating point such as:
• Coupling output or belt coupling
• Coolant temperature up to max. +40 °C (forced ventilation)
• Cooling water inlet temperature up to max. +30 °C (water cooling)
• Complying with the permissible radial and axial forces (refer to Chapter "Radial and axial
forces")
Mechanical properties
4.4Types of bearing
1PH8 SIMOTICS M main motors
Conguration Manual, 12/2022, A5E51895839A 91
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