Bearing washer for thrust bearing and thrust bearing
AssigneeNtn Corporation
InventorsKousuke Obayashi, Yasuyuki Watanabe
Life of this patent
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Abstract
Manufactured by quench hardening, a bearing washer for a thrust bearing inexpensive and excellent in durability is used without being subjected to grinding after quenching. In a bearing washer group including a plurality of bearing washers for the thrust bearing, when camber/waviness of each bearing washer constituting the bearing washer group that is randomly extracted is measured, a value obtained by adding a value three times as large as standard deviation of camber/waviness to an average value thereof is at most 40 μm.
Claims15
A bearing washer group for a thrust bearing, comprising:
- a plurality of bearing washers for a thrust bearing manufactured by quench hardening and used without being subjected to grinding after said quench hardening;
- wherein
- when camber/waviness of each bearing washer constituting said bearing washer group that is randomly extracted is measured, a value obtained by adding a value three times as large as standard deviation of camber/waviness to an average value of camber/waviness is at most 40 μm.
A bearing washer group for a thrust bearing, comprising:
- a plurality of bearing washers for a thrust bearing manufactured by quench hardening and used without being subjected to grinding after said quench hardening;
- wherein
- when camber/waviness washer of each bearing washer group constituting said bearing washer group that is randomly extracted is measured, a probability of detection of the bearing washer of which camber/waviness is equal to or larger than 40 μm is at most 0.1%.
A bearing washer for a thrust bearing manufactured by quench hardening and used without being subjected to grinding after said quench hardening;
- wherein
- an intergranular oxidation layer in a surface portion of said bearing washer has a thickness of at most 1 μm;
- wherein
- when camber/waviness of the bearing washer randomly extracted from bearing washer group is measured, a probability of detection of the bearing washer of which camber/waviness is equal to or larger than 40 μm is at most 0.1%.
Dependencies are inferred from the claim text.