Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
2000-12-01
2002-11-26
Schwartz, Christopher P. (Department: 3613)
Bearings
Rotary bearing
Antifriction bearing
C029S418000, C029S423000, C029S463000, C029S898066
Reexamination Certificate
active
06485186
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to split bearing rings that provide bearing raceways in zero clearance roller bearings and, more particularly, to a method for manufacturing such split bearing rings.
A common type of zero clearance roller bearings employs an outer bearing ring that is split and forced radially inwardly against the rollers. Typically, such split bearing rings must be hardened and stress relieved after forming so that they can adequately support the rollers. A common problem with these split bearing rings is that irregularities occur at the split due to warping and shrinking during the heat treating. As a result, the bearings may not run as smoothly as desired and premature wear of the rollers may occur.
The foregoing illustrates limitations known to exist in present devices and methods. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the invention, this is accomplished by providing a partially manufactured split bearing ring comprising a strip of metal wrapped into a ring configuration such that ends of the strip are positioned in a predetermined relationship to each other. The ends of the strip are attached together by at least one temporary weld joining the two ends of the strip, thereby forming a temporary continuous ring suitable for subsequent manufacturing steps to form a completed split bearing ring that is split at the temporary weld.
In another aspect of the invention, this is accomplished by providing a method of manufacturing a split bearing ring. The method comprises wrapping a strip of metal into a ring configuration such that ends of the strip are positioned in a predetermined relationship to each other, attaching the ends of the strip together by at least one temporary weld joining the two ends of the strip, thereby forming a temporary continuous ring, heat treating the temporary continuous ring, and separating the ends of the temporary continuous ring at the at least one temporary weld to provide a heat treated split bearing ring with a controlled clearance at a split of the split ring.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures.
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Ricard Samuel O.
Wood Eric A.
Bartz C. T.
Bigler John C.
Massina Glenn M.
Schwartz Christopher P.
The Torrington Company
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