Page 935 - Rollingbearings

Designs and variants
Designs and Double row cam • should be relubricated, if: 14

variants rollers – subjected to moisture or solid
contaminants
– they run for long periods at tempera-
• are based on double row angular contact tures above 70 °C (160 °F)
Single row cam ball bearings in the 32 dimension series • have a lubrication hole in the inner ring
(ig. 2)
rollers • have a thick-walled outer ring with its – Where suitable ducts are provided in the
pin, the bearings are easy to relubricate
running surface available in two designs: – The grease should be applied slowly to
• are based on deep groove ball bearings in – crowned as standard (series designation avoid damaging the shields or seals
the 62 series (ig. 1) 3058‥ C)
• have a thick-walled outer ring with its – cylindrical (lat) (series designation When capped bearings must operate under
running surface crowned 3057‥ C) certain conditions, such as very high speeds
• are capped with a sheet steel reinforced • have a 30° contact angle, enabling, or high temperatures, grease may appear
NBR contact seal on both sides together with the two ball sets, tilting between the inner ring and capping device
• are greased for the life of the bearing and moments to be accommodated For bearing arrangements where this would
cannot be relubricated (table 1) • are supplied capped in two variants: be detrimental, appropriate actions should
– with a sheet steel shield on both sides be taken
When capped bearings must operate under that extends into a recess on the inner
certain conditions, such as very high speeds ring (designation sufix -2Z)
or high temperatures, some grease may – with an NBR contact seal on both sides
leak. For bearing arrangements where this (designation sufix -2RS1)
would be detrimental, appropriate actions These cam rollers are not listed in this
should be taken. catalogue, but can be found online at
skf com/go/17000-14-2
• are greased for the life of the bearing
under normal operating conditions
(table 1)

Table 1
Technical speciications of SKF greases for track rollers
Bearing type Speciications for the initial grease ill Thickener Base oil NLGI grade Base oil viscosity Grease for
type [mm 2 /s] relubri-
at 40 °C at 100 °C cation
Temperature range 1) (105 °F) (210 °F)
–50 0 50 100 150 200 250 °C

Single row cam Lithium soap Mineral 2 70 7,3 –
roller
(D ≤ 62 mm)
Single row cam Lithuim soap Mineral 3 100 10 LGMT 3 2)
roller
(D > 62 mm),
Double row cam
roller
Support roller, Lithuim com- Mineral 2 160 15,5 LGWA 2
Cam follower plex soap

–60 30 120 210 300 390 480 °F

1) Refer to the SKF trafic light concept (page 117)
2) Single row cam rollers cannot be relubricated

933