Thermally stable bearings
A rolling bearing has a first ring, a second ring concentric with the first ring, and a plurality of rolling elements disposed between the first and second rings, the first ring and the second ring both being generally annular and having gaps therein. A rotating mechanism has a support structure, a rotating structure, and a rolling bearing as described herein mounted on the support structure and engaging the rotating structure. A rotating mechanism having a CTE and a non-split ring bearing having a bearing CTE that is significantly less than the mechanism CTE can be improved by replacing the non-split ring bearing with a bearing having a similar CTE and a gap in the inner ring and in the outer ring.
1 . A rolling bearing comprising:
a first ring;
a second ring concentric with the first ring; and
a plurality of rolling elements disposed between the first and second rings;
wherein the first ring is generally annular and has a first gap therein and the second ring is generally annular and has a second gap therein.
2 . The bearing of claim 1 , wherein bearing is a large azimuth bearing and the first gap is about 0.76 mm (about 0.03 in.) to about 1.78 mm (about 0.07 in.) wide at room temperature, and the second gap is about 0.76 mm (about 0.03 in.) to about 1.78 mm (about 0.07 in.) wide at room temperature.
3 . A rotating mechanism comprising:
A support structure;
a rotating structure; and
a rolling bearing mounted on the support structure and engaging the rotating structure, the rolling bearing comprising a first ring, a second ring concentric with the first ring, and a plurality of rolling elements disposed between the first and second rings; and
wherein the first ring is generally annular and has a first gap therein and the second ring is generally annular and has a second gap therein.
4 . The mechanism of claim 3 , wherein the bearing rings have a CTE and the support structure has a CTE that is at least about 50% greater than the CTE of the bearing rings.
5 . The mechanism of claim 3 , wherein the bearing is made of steel and the support structure and the rotating structure comprise aluminum.
6 . The mechanism of claim 3 , wherein the bearing is a large azimuth bearing and the first gap is about 0.76 mm (about 0.03 in.) to about 1.78 mm (about 0.07 in.) wide at room temperature, and the second gap is about 0.76 mm (about 0.03 in.) to about 1.78 mm (about 0.07 in.) wide at room temperature.
7 . A method for improving a rotating mechanism having a CTE and a non-split ring bearing having a bearing CTE that is significantly less than the mechanism CTE comprises replacing the non-split ring bearing with a bearing having a CTE equivalent to that of the non-split ring bearing and a gap in the inner ring and in the outer ring.