Strain relief main shaft
AssigneeThe Babcock & Wilcox Company
InventorsRonald D. Mizak, Robert R. Piepho
Life of this patent
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Abstract
An improved main shaft and assembly for a coal pulverizer having a circumferential groove at a predetermined location on the main shaft and in the yoke bushing to provide improved fretting resistance to reduce the occurrence of main shaft failure.
Claims19
An improved main shaft for a coal pulverizer, wherein the improvement comprises a circumferential groove situated in the main shaft adjacent a yoke end below a yoke/shaft joint, wherein the circumferential groove has a width of approximately 6 and a quarter inches and provides a diameter reduction of at least about one inch compared to a nominal diameter of the main shaft.
An improved main shaft for a coal pulverizer, wherein the improvement comprises a circumferential groove situated in the main shaft adjacent a yoke end, wherein the circumferential groove has a width of approximately eight inches and provides a diameter reduction of at least about one inch compared to a nominal diameter of the main shaft.
An improved yoke bushing having a bore constructed to receive a main shaft for a coal pulverizer, comprising:
- a circumferential groove situated on an upper and bottom side of the yoke bushing.
An improved yoke having a bore constructed to receive a main shaft for a coal pulverizer, wherein the improvement comprises a circumferential groove on an upper and bottom side of the yoke.
An improved main shaft assembly for a coal pulverizer, comprising:
- a main shaft having a circumferential groove positioned in the main shaft adjacent a yoke end;
- and
- a yoke bushing having a bore constructed to fit on the yoke end of the main shaft, said yoke bushing having a circumferential groove on an upper and a bottom side of the yoke bushing.
Dependencies are inferred from the claim text.