Page 948 - Rollingbearings

15 Support rollers
Support rollers with • are also available with an axial sliding ring PWTR …2RS design support
lange rings on both sides (designation sufixes PPA, rollers
ig. 7, and PPXA):
– made of PA66 • are based on double row full complement
• do not need adjacent components to guide – forming narrow labyrinth seals with the cylindrical roller bearings (ig. 9)
15 the outer ring and cage axially (ig. 3, outer ring in a radial direction, to protect • have an outer ring with three integral
page 945) against coarse contaminants langes, which guide the roller sets axially
• are non-separable units – serving as contact seals in an axial • have an inner ring with two loose lange
• have different lange designs: direction to retain grease reliably in the rings, which guide the outer ring axially via
– pressed-on lange rings (NATR and bearing the roller sets
NATV designs) – improving lubrication conditions in the • have a relatively large grease quantity
– loose lange rings (NUTR, PWTR and bearing, keeping friction and frictional between the two roller sets
NNTR designs) heat low, and extending grease life • are itted on both sides with an NBR con-
• accommode axial loads that can occur tact seal, being integral with a sheet metal
because of skew or tilting angle ring that is pressed into the outer
NUTR ‥ A design support ring shoulder:
rollers – to press against the lange rings
NATR and NATV design – extending over the lange rings, making
support rollers • are based on double row full complement the bearing non-separable
cylindrical roller bearings without an inte- • accommodate relatively heavy axial loads
• are based on (ig. 6): gral lange between the two roller sets that can occur because of skew or tilting
– a needle roller and cage assembly (ig. 8) • can be supplied with a reinforced (thicker)
(NATR design) • have an outer ring with two integral outer ring to accommodate heavy peak
– a full complement of needle rollers langes, which guide the roller sets axially loads (e g PWTR 50 2RS †
(NATV design) • have an inner ring with two loose lange PWTR 50110 2RS)
• have the outer ring axially guided by rings, which guide the outer ring axially via
pressed-on lange rings, forming a the roller sets
gap-type seal • have a sheet metal angle ring pressed into
the outer ring shoulder on both sides:
– forming an effective labyrinth seal
Fig. 6 – extending over the lange rings, making
the bearing non-separable
• accommodate relatively heavy axial loads
that can occur because of skew or tilting
• can be supplied with a reinforced (thicker)
outer ring to accommodate heavy peak
loads (e.g. NUTR 50 A † NUTR 50110 A)

NATR NATV

Fig. 7 Fig. 8 Fig. 9

NATR ‥ PPA NUTR ‥ A PWTR …2RS

946