Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-02-19
2001-04-10
Marmor, Charles A. (Department: 3681)
Bearings
Rotary bearing
Antifriction bearing
C384S572000
Reexamination Certificate
active
06213648
ABSTRACT:
This application corresponds to and claims priority under 35 U.S.C. § 119 with respect to German Application No. P 198 07 160.4 filed on Feb. 20, 1998, the entire content of which is incorporated herein by reference.
FIELD OF THE INVENTION
This invention generally relates to roller bearings. More particularly, the present invention pertains to a sheet metal cage for roller bearings and a process for producing a sheet metal cage for roller bearings.
BACKGROUND OF THE INVENTION
DE 908 436 describes how sections forming a cage are cut from a pipe provided with axially extending ribs. According to this described method, an axially centered area corresponding to the length of the pockets is turned-out so that only the ribs remain in the finished cage. The axially adjoining sections on both sides of the pockets remain unchanged and form the side rings of the cage.
The pipe with the ribs that forms the starting material can only be produced with great difficulty in the required measuring quality. This is particularly true in the case of long pipes. Because of the ribs, the cutting process is not easy and results in high expenditure and high measuring tolerances.
In light of the foregoing, a need exists for a cage and a method of producing a cage that is not as susceptible to the same disadvantages and drawbacks as those described above.
It would thus be desirable to provide a cage for roller bearings and a method of producing such a cage that permits lower production costs and better quality.
SUMMARY OF THE INVENTION
According to one aspect of the invention, a process for producing a sheet metal cage used in roller bearings involves using a press roll to form a disk-shaped circular sheet metal blank into a tubular element having radially inwardly projecting and axially extending ribs through use of a press roll. Window-shaped pockets are then stamped into the tubular sheet metal element between adjoining ribs to produce a cage of a rolling bearing for receiving rolls in the window-shaped cutouts.
The circular sheet metal blank can be disk-shaped and possesses a bore that already has the size of the inside diameter of the corresponding side ring. The circular sheet metal blank that is axially clamped in the bore area is formed by press rolls on a suitable tool with axial grooves. This creates radially inward oriented ribs while providing a circumferentially closed tubular form. The tool serves as the base for precise measurements, accuracy of shape and profiling of the ribs, thus making it possible to substantially exactly predetermine, in particular, the angle of the side surfaces of the ribs. Also, because the stamping surface does not come into contact with the roll during subsequent use of the cage no further processing of the cage is required.
According to another aspect of the present invention, a sheet metal cage possesses a conically rolled outer surface and side rings arranged at opposite ends. The cage includes ridges extending between the side rings and window-shaped pockets between adjacent pairs of ridges for receiving tapered rolls. The cage also includes ribs extending inwardly from each of the ridges, with the ribs possessing tapering side surfaces.
In accordance with a further aspect of the present invention, a cage for tapered roll bearings includes a sheet metal cage possessing a conically rolled outer surface and having side rings arranged at opposite ends. Ridges extend between the side rings and window-shaped pockets are formed between adjacent pairs of ridges for receiving tapered rolls. The cage is thicker at locations of the ridges than at other locations of the cage.
REFERENCES:
patent: 908 436 (1954-04-01), None
Burns Doane Swecker & Mathis L.L.P.
Marmor Charles A.
Parekh Ankur
SKF GmbH
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