Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-10-01
2001-08-21
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C029S505000, C072S124000, C403S279000
Reexamination Certificate
active
06276838
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a shaft and hub connection as well as a process for producing such a connection. In a known shaft and hub connection, in order to prevent axial displacements, the bearing is supported as a rule against an axial stop. The axial stop can be embodied as a step on the shaft, but this requires a shaft with an enlarged diameter in relation to the hub internal diameter. Securing rings for axial support are also known, which are held in a recess in the shaft. To this end is necessary to provide the shaft with a narrow-tolerance recess and during assembly, to slide the split ring on and anchor it in the recess before the bearing is mounted. This type of retention is expensive and costly to assemble.
SUMMARY OF THE INVENTION
The shaft and hub connection according to the invention for securing bearings, has the advantage that after the bearing is slid on, a positive and frictional, non-positive retention can be affixed in a single step. It is not necessary that the shaft be oversized in certain regions in the bearing. The projection produced by the plastic deformation can be embodied so that on the one hand, it has an axial surface component that rests against an axial surface of the bearing hub. On the other hand, the deformation produces a slight diameter increase in the vicinity beneath the hub so that the fixing is also reinforced in the circumference direction. The otherwise required press fit of the bearing hub on the shaft is thus produced simultaneously with the axial retention. The otherwise conventional preparations, such as a roughening of the shaft in the vicinity of the bearing seat or a reduction of the shaft diameter in front of the bearing seat, can be eliminated. Since the projection from the material of the shaft rests directly against the outside of the bearing, a play-free fastening and retention are achieved without having to comply with narrow tolerances for this purpose.
In order to keep the stress on the bearing low, it is advantageous if the projection only extends over a part of the circumference of the shaft. In the event of considerable axial pressure on the bearing, the projection is preferably produced over the entire circumference of the shaft.
If the projection is produced by rolling, then in rests in a precisely shaped manner against the axial surface of the hub part. Furthermore, the stress concentrations that occur to an increased degree in such narrowed regions are optimally counteracted by the rounded shape used in the rolling.
A very reasonably priced production of the projections is achieved by means of caulking, wherein the caulking tool is pressed into the surface of the shaft in the region in front of the axial surface and is moved toward the axial surface. This raises projections which can be produced in very short cycle times. This process is therefore particularly suited for mass-produced articles.
The process according to the invention for producing a shaft and hub connection, with the features of the collateral claim permits a very reasonably priced, easy-to-assemble manufacture.
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patent: 4848938 (1989-07-01), Haas et al.
patent: 5061090 (1991-10-01), Kriaski et al.
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patent: 2730538 (1996-08-01), None
Fauth Lothar
Fischer Ernst
Herp Juergen
Hurst Richard
Karcher Hansjoerg
Hannon Thomas R.
Robert & Bosch GmbH
Striker Michael J.
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