Rolling bearings

The rolling bearing design with controlled alumina-zirconia ceramics and stabilized zirconia addresses vibration-induced damage, ensuring reduced vibrations and improved durability through precise webiness and peak height management.

JP7868737B1Active Publication Date: 2026-06-02NSK LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NSK LTD
Filing Date
2025-09-26
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing rolling bearings using alumina-zirconia ceramics suffer from increased vibration, which leads to damage and reduced durability due to uncontrolled surface roughness and phase transformations in zirconia, despite efforts to improve mechanical strength and corrosion resistance.

Method used

A rolling bearing design that utilizes alumina-zirconia ceramics with controlled bearing vibration equivalent value P, defined by specific webiness values and maximum peak heights, to reduce vibrations and prevent crack formation, incorporating stabilized zirconia with yttria as a stabilizer to stabilize the tetragonal crystal structure.

Benefits of technology

The design effectively reduces bearing vibrations, preventing cracks and improving durability by ensuring the bearing vibration equivalent value P is maintained at 140 or less, thereby enhancing the longevity and reliability of the bearing.

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Abstract

By sufficiently reducing bearing vibration, the occurrence of cracks and damage can be prevented, thereby improving the durability of the rolling bearing. [Solution] The rolling bearing 10 comprises a pair of raceway rings (outer ring 1, inner ring 3) having a pair of opposing raceway surfaces (outer ring raceway surface 1a, inner ring raceway surface 3a), and a plurality of rolling elements 5 that are held to roll freely between the pair of raceway surfaces (outer ring raceway surface 1a, inner ring raceway surface 3a). The rolling elements 5 are made of alumina-zirconia ceramics. When the wobble components of the rolling elements 5 are separated into low band, medium band, and high band bands, the webbing values ​​are LB(npc), MB(npc), and HB(npc), respectively, and the maximum peak height of the raceway surface is Rp(μm), the bearing vibration equivalent value P calculated by equation (1): P=LB+MB×Rp+HB×Rp is 140 or less.
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