Page 949 - Rollingbearings

Lubrication
NNTR …2ZL design support Lubrication • that operate under contaminated and
rollers damp conditions at high speeds or at tem­
peratures > 70 °C (160 °F) require more
• are based on double row full complement SKF support rollers are supplied greased frequent relubrication
cylindrical roller bearings (ig. 10) (table 1, page 933) • without a cage (full complement of rollers)
• have an outer ring with three integral (R)STO design support rollers can be oil or require more frequent relubrication 15
langes, which guide the roller sets axially grease lubricated In applications where oil is
• have an inner ring with two loose lange used, SKF recommends thoroughly washing
rings, which guide the outer ring axially via the initial grease ill from the bearing prior to
the roller sets operation Relubrication
• have a relatively large grease quantity For general information, refer to Lubrica- features
between the two roller sets tion, page 109
• are itted with a lamellar seal on both
sides, inserted into recesses in the shoul­ The inner rings of SKF support rollers have
ders of the lange rings and the outer ring, one lubrication hole, except:
making the bearing non-separable Relubrication
• accommodate very heavy radial loads and requirements • NNTR designs with d ≤ 90 mm † three
relatively heavy axial loads that can occur lubrication holes
because of skew or tilting • NNTR designs with d ≥ 100 mm † six
Support rollers: lubrication holes

• should be relubricated regularly to achieve If suitable ducts are provided in the pin, the
Cages their full service life, even if the initial bearings are easy to relubricate
grease ill still has its full lubricating
SKF support rollers, if not a full complement properties
of rollers, are itted with one of the cages • used in applications where there are light
shown in table 1 The standard cage is not loads, relatively low speeds and clean
identiied in the bearing designation surroundings can operate for long periods
When used at high temperatures, some before relubrication is required
lubricants can have a detrimental effect on
polyamide cages For additional information
about the suitability of cages, refer to Cages,
page 187

Table 1
Cages for support rollers

Fig. 10

Cage type Window-type, Window-type,
centring depends on size and outer raceway centred
design

Material Sheet steel PA66, glass ibre reinforced
Sufix – TN
NNTR …2ZL

947