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MOUNTING AND FITTING (continued) _____________________________________________________________________
Values
for Interference Factor fp
*Bearing ring thickness is calculated as follows:
Inner ring thickness = li - d
where: d
=
bearing bore
2
D
=
bearing O.D. (*Land diameters are given in the individual bearing specification tables.) |
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| Note that the above fp values are intended as
a guideline only. If the mating part itself has a thin section, then
the above factors will be reduced slightly. The important point is
that interference can significantly reduce radial play and must be
accounted for in a design to arrive at the final desired radial play.
For this reason it is recommended that a higher radial play (e.g.
MC5 - 0.0005" to 0.0008") be used where interference fit
is needed. |
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SHOULDER
DESIGN |
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Shoulder diameter When a bearing is located against a shoulder in the mating part, care must be taken that the rim of the shoulder clears the opposing ring. This is achieved when the diameter of the shoulder has clearance over the opposing race land diameter.
Maximum shaft shoulder diameter = Outer ring land
diameter* - clearance (*Land diameters are given in the individual
bearing.) |
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| Shoulder
corner radius
The corner radius of the shoulder (ra) should be less than the
fillet radius (r) of the mating bearing to allow the bearing to
fully seat against the shoulder. The maximum shoulder corner fillet
radii for bearings are given in the individual bearing tables. |
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Clearance
should be > .010 inch (.25 mm) to allow for normal tolerances.