Page 566 - SKF-bearing-housings

Two-bearing housings PD series

Housings in the PDR series SKF can supply the following combinations,
The bearing arrangement for housings in the available as assembled units († fig. 8):
PDR series comprises († fig. 7):
• PDNA .. DD units, incorporating a deep
• a single row cylindrical roller bearing in the groove ball bearing in the non-locating
NU 3 ECP series, in the non-locating bearing bearing position and a pair of universally
position matchable angular contact ball bearings,
• a cylindrical roller bearing in the NU 3 ECP mounted back-to-back, in the locating bear-
series in combination with a single row deep ing position. Smaller housings accommo-
groove ball bearing in the 63 series (with C3 date axial loads in only one direction, while
clearance), in the locating bearing position larger housings can withstand axial loads in
both directions (a)
The deep groove ball bearing acts as a pure • PDND units, incorporating an NJ design
thrust bearing, accommodating the axial loads cylindrical roller bearing on each end to
in both directions, and is mounted with radial form a cross-located (“floating”) bearing
clearance in the housing. To prevent the outer arrangement (b)
ring from turning, an O-ring is inserted in a • PDNE units, an NJ design cylindrical roller
groove in the cover that abuts the outer ring. bearing and a deep groove ball bearing to
The bearings support heavier radial loads form a cross-located (“floating”) bearing
than bearings in both PDN and PDP series arrangement (c)
housings. • PDNF .. DD units, incorporating an NJ
design cylindrical roller bearing and a pair of
Non-standard bearing arrangements universally matchable angular contact ball
Housings in the PDN series are designed to bearings, mounted back-to-back, to form a
accommodate two deep groove ball bearings. cross-located (“floating”) bearing arrange-
For special applications, the housings can be ment (d)
fitted with various combinations of deep • PDNL units, incorporating a spherical roller
groove ball bearings, angular contact ball bearing on each end to form a cross-located
bearings, cylindrical roller bearings and (“floating”) bearing arrangement (e)
spherical roller bearings.

Fig. 7

562