Page 244 - Rollingbearings

1 Deep groove ball bearings

1 Double row deep Capped bearings
groove ball bearings Selection guidelines for different capping

devices under various operating conditions
Double row deep groove ball bearings (ig. 5) are listed in table 1 However, these guide-
are very suitable for bearing arrangements lines cannot substitute for testing a shield or
where the load carrying capacity of a single seal in its application For additional infor-
row bearing is inadequate. For the same mation, refer to Integral sealing, page 26
bore and outside diameter, double row bear- The seals, which are itted in a recess on
ings are slightly wider than single row bear- the outer ring, make good, positive contact
ings in the 62 and 63 series, but have a con- with the recess, without deforming the outer
siderably higher load carrying capacity ring The capping devices are available as:
Double row deep groove ball bearings are
only available as open bearings (without
seals or shields)

Fig. 5
Double row bearing

Table 1
Selection guidelines for SKF capping devices
Requirement Shields Non-contact seals Low-friction seals Contact seals

Z, ZS RZ RSL RST RSH RS1

Low friction +++ +++ ++ ++ ○ ○
High speed +++ +++ +++ + ○ ○
Grease retention ○ + +++ +++ +++ ++

Dust exclusion ○ + ++ ++ +++ +++
Water exclusion
static – – ○ +++ +++ ++
dynamic – – ○ + ++ +
high pressure – – ○ ○ +++ ○

Symbols: +++ = best ++ = very good + = good ○ = fair – = not recommended

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