Page 142 - Rollingbearings

Bearing interfaces

B 6 Bearing interfaces

The ISO tolerance Selecting its
Bearing seats on shafts and in housings, and
components which locate a bearing axially,
have a signiicant impact on bearing perfor- system
mance To fully exploit the load carrying abil- Fits can be selected by following the recom-
ity of a bearing, its rings or washers should mendations for bearing seat diameter toler-
be fully supported around their complete Fits for rolling bearings are typically speciied ances (Seat tolerances for standard condi-
circumference and across the entire width of with standard tolerance classes for holes and tions, page 148) These recommendations
the raceway Bearing seats should be manu- shafts as described in ISO 286-2 As bear- will provide adequate solutions for the
factured to adequate geometrical and ings are typically manufactured to ISO toler- majority of applications However, they do
dimensional tolerances and be uninter- ances (Tolerances, page 36), the selection of not cover all details of a speciic application
rupted by grooves, holes or other features the tolerance class for the bearing seat and so you may ind that adjustments may
In this section you can ind recommenda- determines the it The position and width of be necessary When selecting its, you should
tions and requirements for designing bear- the tolerance intervals of commonly used consider the following topics
ing interfaces, including: tolerance classes relative to the bearing bore
Bearing interfaces • criteria when selecting bearing its trated in ig. 1, which is valid for bearings
and outside diameter tolerances are illus-
• recommended its for standard conditions
with Normal tolerances and of medium size
It is important to note that the ISO tolerance
• tables to help determine minimum, max-
classes for rolling bearings and for holes and
imum and probable values of clearance or
shafts are different The tolerances for each
interference between the bearing and its
seat
You should therefore select the respective
B.6 • recommendations for specifying geomet- size vary over the full range of actual sizes
rical tolerances of bearing seats
tolerance classes for bearing seats based on
• recommendations for the axial support of the actual bearing size for your application
bearing rings
• further design considerations for bearing
interfaces

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