Bearing for alternator and bearing for pulley
AssigneeNtn Corporation
InventorsChikara OHKI, Tomoaki GOTO
Life of this patent
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Abstract
There is provided a bearing for alternators and a bearing for pulleys capable of reducing hydrogen embrittlement or cracking despite that the bearing is used in an environment under such a severe condition that hydrogen is generated from grease or the like and the bearing experiences a load of a condition facilitating hydrogen embrittlement or cracking. The bearing includes a rolling element, an inner ring and an outer ring, and at least one of the rolling element and the inner and outer rings has a nitrogen enriched layer and contains austenite crystal grains having a grain size number exceeding 10.
Claims18
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A bearing for an alternator, supporting a rotor shaft having one end with a pulley attached thereto and having a belt engaged therearound to transmit a driving force to said pulley to allow said rotor shaft to rotate a rotor, the bearing comprising a rolling element, an inner ring and an outer ring, at least one of said rolling element and said inner and outer rings having a nitrogen enriched layer and having a hydrogen content of no more than 0.5 ppm.
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A bearing posed between a pulley having a belt engaged therearound and a rotative shaft passing through said pulley, the bearing comprising a rolling element, an inner ring and an outer ring, at least one of said rolling element and said inner and outer rings having a nitrogen enriched layer and having a hydrogen content of no more than 0.5 ppm.
Dependencies are inferred from the claim text.