Page 938 - Rollingbearings

14 Cam rollers

14 Temperature Speed limits Guide langes
limits For rails or cams with guide langes, the
The limiting speed listed in the product tables recommended lange height h (ig. 3)
a
is a mechanical limit that should not be should be:
The permissible operating temperature for exceeded unless the bearing design and the
cam rollers can be limited by: application are adapted for higher speeds. h ≤ 0,5 (D – D )
a
1
For additional information, refer to Oper-
• the dimensional stability of the bearing ating temperature and speed, page 130. The values for the outer ring diameters D
rings and balls and D are listed in the product tables
1
• the cage
• the seals
• the lubricant
Design
Where temperatures outside the permissible considerations
range are expected, contact SKF

Bearing rings and balls Pins

SKF cam rollers are heat stabilized up to at Pins or shafts should be machined to toler-
least: ance class g6�:

• 120 °C (250 °F) for single row cam rollers • for normal operating conditions, such as
• 150 °C (300 °F) for double row cam rollers stationary inner ring load
• where easy displacement of the inner ring
Cages is required
Steel cages can be used at the same oper-
ating temperatures as the bearing rings and
balls For temperature limits of PA66 cages, Support surfaces
refer to Polymer cages, page 188
Continuously axial loaded cam rollers should
Seals be supported over the entire inner ring side
face (ig. 3) and the support surface should
The permissible operating temperature for be dimensioned according to diameter d
1
NBR seals is –40 to +100 °C (–40 to (product tables, page 938)
+210 °F) Temperatures up to 120 °C
(250 °F) can be tolerated for brief periods
Typically, temperature peaks are at the
seal lip
Fig. 3
Lubricants Cam roller with supported inner ring or
lange
Temperature limits for greases used in SKF
cam rollers are provided in table 1,
page 933 For temperature limits of other
SKF greases, refer to Selecting a suitable
SKF grease, page 116
When using lubricants not supplied by
SKF, temperature limits should be evaluated
d 1 D 1 D
according to the SKF trafic light concept
(page 117).

h a

936