Page 650 - SKF-bearing-housings

Trunnion bearing housings for grinding mills

Table 1
Seals for FSDR .. K trunnion bearing housings for grinding mills

Seal
Type labyrinth seal with 1 V-ring seal labyrinth seal with 2 V-ring seals
Housing size range 39/850, 39/1060, 39/1180 49/1320
and 48/1500
Material
labyrinth seal grey cast iron grey cast iron
V-ring seals rubber (NBR) rubber (NBR)
PTFE strip PTFE impregnated fibres (ramie) n/a
Application conditions and
requirements
Temperature [°C] –40 to +100 –40 to +100
Temperature [°F] –40 to +210 –40 to +210
Max. circumferential speed [m/s] 2 10
Max. misalignment [°] 0,5 0,5
Low friction + ++
Axial shaft displacement [mm] ± 10 ± 10
Replacement ++ ++
Shaft tolerance class h9V E h9V E
Shaft roughness R a [µm] ≤ 3,2 ≤ 3,2

Sealing suitability
Dust ++ ++
Fine particles ++ ++
Coarse particles ++ ++
Chips ++ ++
Liquids when sprayed ++ ++
Direct sunlight ++ ++

Symbol: n/a not applicable
++ very suitable
+ suitable
– limited suitability
–– unsuitable

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