Sheet-metal cage for roller bearings

Details Sheet-metal cage for roller bearings Sheet-metal cage for roller bearings

1998-06-08

2001-05-29

Footland, Lenard A. (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

C384S575000

Reexamination Certificate

active

06238097

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates improvements in sheet-metal cages for roller bearings.
BACKGROUND OF THE INVENTION
Sheet-metal cages are not new per se. For example, U.S. Pat. No. 1,840,607 shows a typical sheet metal cage. Cages of this type are usually shaped out of raw material. Cages for conical roller bearings are often provided with a side ring on the smaller diameter of the cage. The bore surface of this side ring is designed as a sliding surface and is guided on a corresponding flange of the inner ring. To make it possible for the set of rollers, the cage, and the inner ring to be assembled, measures must be taken to ensure that the rollers can be inserted in the axial direction over the flange of the inner ring. One possibility consists in first expanding the side of the cage with the smaller diameter and then drawing it back in again to the operating dimension after it has been installed. This last work step, however, has disadvantageous effects on the precise circular form of the bore surface of the side ring and thus on the behavior of the cage as it slides on, and is guided by, the flange of the inner ring. It cannot be expected, furthermore, that the drawing-in step will be able to produce the narrow gap between the surface of the flange and the surface of the bore required for a sliding bearing at this point, because the cage material will spring back. The disadvantages described here on the basis of a cage for conical roller bearings also occur in the case of flange-guided cages for cylindrical roller bearings and self-aligning roller bearings when the cage is subjected to a subsequent forming step after the bearing has been assembled.
SUMMARY OF THE INVENTION
With the foregoing in mind, it is an object of the present invention to create a sheet-metal cage for roller bearings of the type described above with a guide surface in the bore of its side ring which is not deformed or changed during subsequent reshaping or calibrating operations.
The task is accomplished in that a ring-shaped section of the side ring carrying the bore surface is connected to the sheet-metal cage by way of radially deformable flexing elements. The flexing elements prevent most of the forces of radial deformation from being transferred to the part of the side ring carrying the bore surface during the step of drawing-in the sheet-metal cage. Thus, the bore surface retains its original form and diameter, designed to correspond to the surface of the flange on the inner ring. This means that uniform results with respect to guide properties between the surfaces of the flange and the bore are obtained, especially under conditions of mass production.


REFERENCES:
patent: 1840607 (1932-01-01), Scribner et al.
patent: 3767278 (1973-10-01), Knowles
patent: 4522516 (1985-06-01), Neese
patent: 5660593 (1997-08-01), Urban et al.

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