Conditions of bearing rotation

he conditions of rotation indicate the motion of one bearing ring with respect to the load direction and are expressed as either circumferential load or point load

Point load
If the ring remains stationary relative to the load direction, there are no forces that displace the ring relative to its seating surface. This type of load is described as point load.

There is no risk that the seating surface will be damaged and a loose fit is possible.

Circumferential load
If forces are present that displace the ring relative to its seating surface, every point on the raceway is subjected to load over the course of one revolution of the bearing. A load with this characteristic is described as a circumferential load.

Conditions of rotation

Conditions of motion Example Schematic Load case Fit
Rotating inner ring

Stationary outer ring

Constant load direction
Shaft with weight load Circum- ferential load on inner ring Inner ring: tight fit necessary

Outer ring: loose fit permissible
Stationary inner ring

Rotating outer ring

Load direction rotates with outer ring
Hub bearing arrangement with significant imbalance and

Point load on outer ring
Stationary inner ring

Rotating outer ring

Constant load direction
Passenger car front wheel bearing (hub bearing arrangement) Point load on inner ring Inner ring: loose fit permissible

Outer ring: tight fit necessary
Rotating inner ring

Stationary outer ring

Load direction rotates with inner ring
Centrifuge, vibrating screen and

Circum- ferential load on outer ring

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