Page 203 - Rollingbearings

Mounting and dismounting
Methods and tools Mounting bearings with a Cold mounting
Depending on the bearing type and size, cylindrical bore If the it is not too tight, small bearings can
mechanical, thermal or hydraulic methods be driven into position by applying light
are used for mounting (table 2, page 202) Non-separable bearings hammer blows to a bearing itting tool
Bearing sizes are categorized as follows: (ig. 28) The tool enables the mounting
With non-separable bearings, the ring that force to be applied centrally
• small → d ≤ 80 mm requires the tighter it is usually mounted If a bearing has to be pressed onto the
• medium-size → 80 mm < d < 200 mm irst shaft and into the housing bore at the same
• large → d ≥ 200 mm time, the mounting force must be applied
Separable bearings equally to both rings and the abutment sur-
In all cases, it is important that the bearing faces of the mounting tool must lie in the
rings, cages and rolling elements or seals With separable bearings, the inner ring can same plane Whenever possible, mounting
are never struck directly with any hard object be mounted independently of the outer ring, should be done with an SKF bearing itting
and that the mounting force is never applied which simpliies mounting, particularly tool (ig. 28)
through the rolling elements where both rings have an interference it With self-aligning bearings, the use of an
For an interference it, the mating sur- When mounting the shaft and inner ring intermediate mounting ring prevents the
faces should be coated with a thin layer of assembly into the housing containing the outer ring from tilting and swivelling when
light oil For a loose it, the mating surfaces outer ring, careful alignment is required to the bearing and shaft assembly is introduced
should be coated with SKF anti-fretting avoid scoring the raceways and rolling ele- into the housing bore (ig. 29) The balls of
agent ments When mounting cylindrical or needle larger self-aligning ball bearings in the 12
roller bearings with an inner ring without and 13 series protrude from the sides of the
langes or with a lange on one side only, a bearing, therefore the mounting ring must
Sealing, mounting and dismounting
guiding sleeve should be used (ig. 27) The have a recess
outside diameter of the sleeve should be the
same as the raceway diameter of the inner
ring and should be machined to tolerance
class d10� for cylindrical roller bearings,
and to tolerance 0/–0,025 mm for needle
roller bearings

Fig. 28
Bearing itting tool

B.8

Fig. 27
Use of a guiding sleeve for mounting of a
cylindrical roller bearing

Fig. 26 Fig. 29
Loading of eye bolts only in direction of Mounting a self-aligning ball bearing by
the shank axis use of an intermediate mounting ring

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