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SELECTION OF BEARING ARRANGEMENT
Table 4. 1 Representative Bearing Mounting Arrangements
and Application Examples (cont'd)
Bearing Arrangements When there is no distinction between
fixed-end and free-end
Remarks Application Examples Remarks Application Examples
Fixed-end Free-end
fThis can withstand heavy loads and shock Final reduction gears of
loads. construction machines
fThis is the most common arrangement. Double suction volute pumps, fIt can be used if interference is necessary for
automotive transmissions both the inner and outer rings.
fIt can sustain not only radial loads, but
moderate axial loads also. fCare must be taken so the axial clearance
doesn't become too small during running.
NJ + NJ mounting
fNF type + NF type mounting is also possible.
fThis is the most suitable arrangement when Speed reducers, table rollers of fSometimes a spring is used at the side of the Small electric motors, small
there is mounting error or shaft deflection. steel mills, wheels for overhead
travelling cranes outer ring of one bearing. speed reducers, small pumps
fIt is often used for general and industrial
applications in which heavy loads are applied.
fThis is suitable when there are rather heavy Worm gear reducers Vertical arrangements Remarks Application Examples
axial loads in both directions.
fMatched angular contact ball bearings are on Vertical electric motors
fDouble row angular contact bearings may be the fixed end.
used instead of a arrangement of two angular
contact ball bearings. fCylindrical roller bearing is on the free end.
When there is no distinction between Remarks Application Examples
fixed-end and free-end
fThis arrangement is widely used since it can Pinion shafts of automotive
withstand heavy loads and shock loads. differential gears, automotive
front and rear axles, worm gear
fThe back-to-back arrangement is especially reducers
good when the distance between bearings is
Back-to-back mounting short and moment loads are applied. fThe spherical center of the self-aligning seat Vertical openers (spinning and
Face-to-face mounting must coincide with that of the self-aligning ball weaving machines)
fFace-to-face mounting makes mounting easier bearing.
when interference is necessary for the inner
ring. In general, this arrangement is good when fThe upper bearing is on the free end.
there is mounting error.
fTo use this arrangement with a preload,
affection must be paid to the amount of preload
and clearance adjustment.
fThis is used at high speeds when radial loads Grinding wheel shafts
are not so heavy and axial loads are relatively
Back-to-back mounting heavy.
A 22 fIt provides good rigidity of the shaft by
preloading.
fFor moment loads, back-to-back mounting is
better than face-to-face mounting.
Continued on next page
A 23
