Page 587 - Rollingbearings

Designs and variants
Basic design bearings Fig. 8 Fig. 9
Drawn cup needle roller bearing with open Drawn cup needle roller bearing with a
• Drawn cup needle roller bearings with ends closed end
open ends (series designation HK, ig. 8)
– are available open (without seals) or
sealed on one or both sides (Sealing
solutions, page 594)

• Drawn cup needle roller bearings with a
closed end (series designation BK, ig. 9)
– are available open or sealed (Sealing
solutions)
– are suitable for bearing arrangements
where they are situated at the end of a
shaft
– accommodate small axial guidance
forces, because of the proiled design of
their closed end HK BK

• Full complement bearings with open
ends (series designation HN, ig. 10) Fig. 10 Fig. 11
– are suitable for very heavy radial loads Full complement drawn cup needle roller Double row drawn cup needle roller bear-
at moderate speeds bearing with open ends ing with open ends
– are available with open ends and with-
out seals only
Full complement drawn cup needle roller
bearings are supplied with a special
grease to secure the rollers during trans-
port. However, SKF recommends relubri- 7
cating after mount ing. Depending on the
required grade, SKF recommends
SKF LGEP 2 or SKF LGWM 1 grease for
relu brication The technical speciications
of the initial grease ill and the relubrica-
tion greases are listed in table 1.

HN HK

Table 1
Technical speciications of SKF standard greases for full complement drawn cup needle roller bearings
Grease Temperature range 1) Thickener Base oil NLGI grade Base oil viscosity
type [mm 2 /s]
at 40 °C at 100 °C
–50 0 50 100 150 200 250 °C (105 °F) (210 °F)

Initial grease ill Lithium soap Mineral 1–2 200 18,7
LGEP 2 Lithium soap Mineral 2 200 16

LGWM 1 Lithium soap Mineral 1 200 16

–60 30 120 210 300 390 480 °F

1) Refer to the SKF trafic light concept (page 117).

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