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Shaft-bearing combinations

PD two-bearing housings accommodate bearings on a cylindrical seat on stepped shafts.

Standard bearing arrangements

PD two-bearing housings can accommodate different bearing arrangements, depending on the series.
Housings in the PDN series

The bearing arrangement for housings in the PDN series comprises:

  • two single row deep groove ball bearings in the 62 series for housings in the PDN 2 series (fig. 1)
  • two single row deep groove ball bearings in the 63 series for housings in the PDN 3 series (fig. 2)

The bearing arrangements are intended for normal load conditions and relatively high speed operation. The arrangement for housings in the PDN 3 series can accommodate heavier loads than PDN 2 series housings.

A wave spring washer, supplied with housings up to size 218 or 316, preloads the bearings against each other to reduce noise levels. Units with spring-loaded bearings can accommodate axial loads in one direction only (→ Mounting).

Housings in the PDN series can also be used for other bearing combinations (→ Non-standard bearing arrangements).

Housings in the PDP series

The bearing arrangement for housings in the PDP series comprises (fig. 3):

  • a single row cylindrical roller bearing in the NU 22 ECP series, in the non-locating bearing position
  • a pair of universally matchable single row angular contact ball bearings in the 72 series, mounted back-to-back in the locating bearing position

This bearing arrangement accommodates axial loads in both directions and can support heavier loads than bearings in PDN series housings.

Housings in the PDP series can also accommodate other bearing combinations.

Housings in the PDR series

The bearing arrangement for housings in the PDR series comprises (fig. 4):

  • a single row cylindrical roller bearing in the NU 3 ECP series, in the non-locating bearing position
  • a cylindrical roller bearing in the NU 3 ECP series in combination with a single row deep groove ball bearing in the 63 series (with C3 clearance), in the locating bearing position

The deep groove ball bearing acts as a pure thrust bearing, accommodating the axial loads in both directions, and is mounted with radial clearance in the housing. To prevent the outer ring from turning, an O-ring is inserted in a groove in the cover that abuts the outer ring.

The bearings support heavier radial loads than bearings in both PDN and PDP series housings.

Non-standard bearing arrangements

Housings in the PDN series are designed to accommodate two deep groove ball bearings. For special applications, the housings can be fitted with various combinations of deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings and spherical roller bearings.
SKF can supply the following combinations, available as assembled units:
  • PDNA .. DD units, incorporating a deep groove ball bearing in the non-locating bearing position and a pair of universally matchable angular contact ball bearings, mounted back-to-back, in the locating bearing position. Smaller housings accommodate axial loads in only one direction, while larger housings can withstand axial loads in both directions (fig. 5)
  • PDND units, incorporating an NJ design cylindrical roller bearing on each end to form a cross-located (“floating”) bearing arrangement (fig. 6)
  • PDNE units, incorporating an NJ design cylindrical roller bearing and a deep groove ball bearing to form a cross-located (“floating”) bearing arrangement (fig. 7)
  • PDNF .. DD units, incorporating an NJ design cylindrical roller bearing and a pair of universally matchable angular contact ball bearings, mounted back-to-back, to form a cross-located (“floating”) bearing arrangement (fig. 8)
  • PDNL units, incorporating a spherical roller bearing on each end to form a cross-located (“floating”) bearing arrangement (fig. 9)
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