Page 952 - Rollingbearings

15 Support rollers
Temperature Seals Speed limits
The permissible operating temperature for
limits seals depends on the seal material:
The limiting speed listed in the product
• NBR: –40 to +100 °C (–40 to +210 °F) tables is a mechanical limit that should not
15 The permissible operating temperature for Temperatures up to 120 °C (250 °F) can be exceeded unless the bearing design and
support rollers can be limited by: be tolerated for brief periods the application are adapted for higher
• PA66 sliding rings: –30 to +100 °C (–20 to speeds
• the dimensional stability of the bearing +210 °F) For additional information, refer to Oper-
rings and rollers ating temperature and speed, page 130
• the cage Typically, temperature peaks are at the seal
• the seals lip
• the lubricant
Lubricants Design
Where temperatures outside the permissible
range are expected, contact SKF Temperature limits for greases used in SKF considerations
support rollers are provided in table 1,
Bearing rings and rollers page 947 For temperature limits of other
SKF greases, refer to Selecting a suitable Pins
SKF support rollers are heat stabilized up to SKF grease, page 116
at least 140 °C (280 °F). When using lubricants not supplied by For general information, refer to Bearing
SKF, temperature limits should be evaluated interfaces, page 139
Cages according to the SKF trafic light concept For support rollers with an inner ring, the
(page 117) pin/shaft should be machined to tolerance
Steel cages can be used at the same oper- class g6� under the following conditions:
ating temperatures as the bearing rings and
rollers. For temperature limits of PA66 • stationary inner ring load
cages, refer to Polymer cages, page 188 • where easy displacement of the inner ring
is required

Table 2
ISO tolerance classes
Nominal h7� h9� h10� h12� F6�
dimension Deviations Deviations Deviations Deviations Deviations
> ≤ U L U L U L U L U L
mm µm µm µm µm µm

3 6 0 –12 – – – – – – – –
6 10 0 –15 0 –36 – – – – +22 +13
10 18 0 –18 0 –43 – – 0 –180 +27 +16
18 30 0 –21 0 –52 – – 0 –210 +33 +20
30 50 – – 0 –62 – – 0 –250 +41 +25
50 80 – – – – – – – – +49 +30
120 180 – – – – 0 –160 – – – –
180 250 – – – – 0 –185 – – – –
250 315 – – – – 0 –210 – – – –

950