Metal working – Method of mechanical manufacture – Process for making bearing or component thereof
Reexamination Certificate
1999-05-18
2001-08-28
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Process for making bearing or component thereof
C029S521000
Reexamination Certificate
active
06279231
ABSTRACT:
BACKGROUND OF THE INVENTION
It is already known from DE 2,335,701 that an outer ring for a ball bearing can be pressed into a runner shell and that this can then be secured axially by wedging a ring over it.
The material of the runner shell which projects axially beyond the seating surface is thus axially deformed, i.e., flattened and bent over, and thus a certain amount of material is pushed against the outer ring in the radial and axial directions. As a result, a reliable, positive form-locking connection is achieved.
When runner shells are drawn (formed by pressing a die into a flat sheet of metal) the resulting edge material from which the bent over wedge is formed is not uniform in thickness, axial height, and radius of curvature. In prior art, the ring shaped die uniformly compresses the edge material around the outer ring of the bearing causing non-uniform stresses on the outer ring of the bearing leading to unallowable deformation of the outer ring pushing it out of its circular shape. This deformation leads to premature failure of the roller bearing. The way to prevent this unallowable deformation is to uniformly deform edge material such that the stresses and hence deformation is uniform around the outer ring.
This invention solves that problem by making the ring shaped forming or wedging surface or edge deforming die non-uniform in height so that during the edge forming process the same amount of material and thus equal stresses are formed around the circumference of the outer ring of the bearing
SUMMARY OF THE INVENTION
The task of the invention is to create a device for axial attachment of the type cited above which does not cause any deformation of the roller bearing even when the seating conditions are not uniform.
The task is accomplished in that the axial height of the wedging surface of the ring-shaped die is adapted to the circumference of the housing material in cases where the degree to which this material projects varies around the circumference. In other words, the die face configuration is selectively varied around its circumference so that the material displaced to form the bead is generally the same around the circumference and thus generally uniform. Equal stresses are produced which prevents undesirable distortion of the outer ring during the edge forming process.
As a result of the adaptation of the ring-shaped die, this die is seated uniformly around the circumference of the material to be deformed even before the deformation occurs. As a result, there are no sections of material which are compressed to a greater extent than any other areas. Equal radial forces thus act advantageously at every point around the circumference on the outer ring to be attached.
REFERENCES:
patent: 2881646 (1959-04-01), Farr et al.
patent: 3317986 (1967-05-01), Sutowski
patent: 3662462 (1972-05-01), Shiflet
patent: 4087897 (1978-05-01), Sholefield
patent: 5136772 (1992-08-01), Rupprecht et al.
patent: 5384948 (1995-01-01), Bonfilio et al.
patent: 5463811 (1995-11-01), Aureli et al.
patent: 5513433 (1996-05-01), Sumiyoshi et al.
patent: 5579568 (1996-12-01), Hudson et al.
patent: 23 35 701 C2 (1973-07-01), None
Beyfuss Berthold
Friedrich Hans-Juergen
Horling Peter
Butler Marc W.
Hughes S. Thomas
Renz, Jr. , PC Eugene E.
SKF GmbH
LandOfFree
Device for axial attachment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for axial attachment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for axial attachment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2442070