Bearing for alternator and bearing for pulley

Bearings – Rotary bearing – Antifriction bearing

Reexamination Certificate

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C384S912000, C148S906000

Reexamination Certificate

active

07744283

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.

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