deva.bm technical handbook - Federal-Mogul Deva - #9

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Text version of the page
deva.bm®
maintenance-free
5 Fits
Permissible fit and tolerance ranges
Shaft
Normal applications
d7 d7 d7 d7
Precision applications
e7 e7
e7 e7
In installed state
H9 H8
H8 / H9 (Standard) H8 / H9
< 20
> 20
> 45
> 180
Table 5.1 - Fits and tolerances
deva.bm® is pressed into the housing with an interference fit (using a screw press, hydraulic press or press-fit mandrel). Tapping or driving into place is not permissible.
The standard housing bore is H7.
Mean roughness of housing: Ra = 3.2 j^m
The housing has a chamfer of 20 - 40° for easier
mounting.
To achieve minimum clearances after mounting (IT7 or higher), finishing should take place in the mounted state. For this purpose, deva.bm® can be provided with a machining allowance, in which case the running-in film has to be applied after finishing.
Design
(0
il
Sliding surface design
'55 a
For grease-lubricated applications, the deva.bm® sliding layer can be provided with regularly spaced lubrication indentations, which act as a lubricant 'reservoir' to prolong the service life (Figure 6.1.3).
For applications without any special dry running criteria, deva.bm® can be used with a plain sliding surface and a running-in film (Figure 6.1.1). For difficult, non-lubricated applications in abrasive and vibrating environments, etc., deva.bm® can also be provided with cleaning grooves in the sliding layer as a means of prolonging the service life (Figure 6.1.2).
Figure 6.1.2 - Sliding layer with cleaning grooves
Figure 6.1.3 - Sliding layer with lubrication indentations
Figure 6.1.1 - Plain sliding surface
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pageCatalog pdf di En 2012-05-22-29