Page 905 - Rollingbearings

page 903

Design considerations
Design Raceways on shafts

considerations and in housings

• should have the same hardness, surface
Abutment inish and axial run-out as a bearing

dimensions washer, if the load carrying capacity of a
needle roller and cage thrust assembly is
to be fully exploited
Abutment dimensions should fulil the • should be designed using the dimensions
following: E and E (product tables, page 906),
a
b
which take radial displacement of the
• Support surfaces on shafts and in hous- roller set into consideration
ings should be at right angles to the shaft
or housing axis and should provide For additional information, refer to Raceways
uninterrupted support over the entire on shafts and in housings, page 179.
washer face.
• The abutment diameter on the shaft
should be ≤ E and in the housing ≥ E .
b
a
Values for E and E (product tables,
b
a
page 906) take the movement and posi-
tion of the roller set into consideration.
• Shafts and housings should be manu-
factured to suitable tolerance classes
(table 4) to provide satisfactory radial
guidance for the individual thrust bearing
components:
– Housing centred washers † radial space
between the shaft and washer bore
required
– Shaft centred washers † radial space
between the washer and the housing
bore required

Needle roller and cage thrust assemblies in
the AXW series are generally combined with
drawn cup needle roller bearings (ig. 6,
page 897) or needle roller bearings with
machined rings (ig. 7, page 897). The same
housing tolerance must be selected for the
centring lange as for the radial bearing. Table 4
Needle roller and cage thrust assemblies Shaft and housing tolerance classes
are generally shaft centred, to reduce the
circumferential speed at which the cage Bearing component Series Tolerance class 1) Housing centred
Shaft centred

slides against the guiding surface. This is
particularly important for higher-speed
applications. The guiding surface should be Needle roller and cage thrust AXK h8 –
assemblies
ground.
Universal washers LS h8 radial space
radial space H9
Thin universal washers AS h8 radial space
radial space H9 12
Shaft washers WS 811 h8 –
Housing washers GS 811 – H9

1) The envelope requirement (symbol � from ISO 14405-1) is not shown but applies to all tolerance classes.

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