certific at e - NOC international

134 KRW
Assembling roller bearings
For the choice of the fits of shaft and housing the knowledge of the power and kinematic of the bearing neccecary
The load and the motion relations are shon in the table.
Load and Motion Relations
Motion Inner ring/
shaft
Outer ring/
housing
Schematics Description Typical examples Load applied Fit Load applied Fit
Rotating inner ring,
fixed outer ring, load
direction is fixed.
Fixed inner ring,
rotating outer ring, load
direction rotating with
the outer ring
Fixed inner ring,
rotating outer ring, load
direction unchanged
Rotating inner ring,
fixed outer ring, load
direction rotating with
inner ring
Spur gears, eletric
motors
Hub bearing with high
imbalance
Castor rollers with fixed
axis, cable pulleys
oscillating screens,
imbalance vibrating
systems
Circumferencial
load at
inner ring
Pointed load at
inner ring
Fixed seat
required
Loose seat
possible
Pointed load at
outer ring, split
housing design
possible
Circumferencial
load at
outer ring, do
not use split
housings.
Loose seat
possible
Fixed seat
required.
Combination of various motions or changing motions Crankshaft drives Fit and tolerances for shaft and housing are
based upon the dominant load and the bearing
installation and adjustment requirements.
Tolerances of shaft- and housing fits
For trouble-free operation of the bearing, it is necessary to keep to the prescribed tolerances of the modification
parts, for example, of the shaft and housing seat shown in the design diagrams.
The selection of the correct fit complies with the roller bearing’s prescribed function, for example, as fixed or floating
bearing, and the type of movement and load.
Since design irregularities in the fitting surfaces directly affect the function surfaces, they must be checked.
The shaft tolerances and housing tolerances tables provide an overview of the fits required for each type and level
of load and the operating conditions, differentiated according to bearing types.