Bearing for alternator and bearing for pulley
AssigneeNtn Corporation
InventorsChikara OHKI, Tomoaki Goto
Life of this patent
Estimating the term…
Abstract
A bearing for alternators and a bearing for pulleys for reducing hydrogen embrittlement or cracking is used when the bearing is in an environment having a severe condition, such as, when hydrogen is generated from grease or the like. The bearing includes a rolling element, an inner ring and an outer ring, and at least one of the rolling element, where the inner and outer rings have a nitrogen enriched layer containing austenite crystal grains having a grain size number exceeding 10.
Claims14
1-3. (canceled)
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 providing a fracture stress value of no less than 2,650 MPa
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.
10-12. (canceled)
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 providing a fracture stress value of no less than 2,650 MPa.
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.