Rolling-bearing and bearing unit

a technology of rolling bearings and bearings, which is applied in the direction of rotary machine parts, mechanical equipment, chemistry apparatus and processes, etc., can solve the problems of difficult to reduce contamination any further using just this method, difficult to remove very small burrs from machined surfaces, and difficult to remove remaining abrasives, especially sticked thorn-like abrasives

Inactive Publication Date: 2002-07-11
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventionally, it has been possible to reduce contamination by washing in the assembly process after surface finishing, however, it is difficult to reduce contamination any further using just this method.
Toku Kai Sho 62-24956, finishing is performed by machining, so it is difficult to remove very small burrs from the machined surfaces, and it is difficult to remove remaining abrasive, particularly sticked thorn-like abrasive.
Further, it is difficult to remove minute burrs even by performing supersonic washing for a long period of time.
Toku Kai Hei 3-84218 is effective in removing large burrs and sludge, however sinc

Method used

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  • Rolling-bearing and bearing unit
  • Rolling-bearing and bearing unit
  • Rolling-bearing and bearing unit

Examples

Experimental program
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Embodiment Construction

[0040] A bearing outer race made of SUS440C was prepared and composite electrolytic polishing was performed for it. After a suitable amount of particles were made to adhere to the surface, the outer race was washed. Washing was performed by immersing the outer race in a clean solution and then irradiating it with supersonic waves. After each specified interval of supersonic irradiation, the particles having a size of 1 .mu.m or greater and that were released into the solution were counted by a particle counter in the solution. The surface roughness Rmax of the outer race for which the composite electrolytic polishing process was performed was 0.3 .mu.m for the inner-diameter surface and outer-diameter surface, and 0.27 .mu.m for the end surfaces.

[0041] As a comparison, a bearing outer race made of SUS440C was prepared without composite electrolytic polishing performed for it. After a suitable amount of particles were made to adhere to the surface, the outer race was washed and the p...

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PUM

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Abstract

A rolling bearing 10 comprises races 11, 12 having a raceway 15, 16 and rolling elements 13 having a rolling contact surface, wherein at least the raceway 15, 16 of the races 11, 12 has a machined surface, and a surface layer 11a, 12a is formed on the machined surface by electrochemically or chemically dissolving the machined surface, whereby contamination is substantially reduced.

Description

[0001] 1. Field of the Invention[0002] This invention relates to a rolling-bearing and a bearing unit that are used in fields such as information-processing equipment, aerospace, airplane and semiconductors.[0003] 2. Description of the Related Art[0004] In order to improve resistance to wear, and reduce the generation of dust particles of a rolling bearing, the following methods have been proposed as methods for surface finishing of the raceway surfaces.[0005] Japanese patent publication No. Toku Kai Sho 62-24956 proposes a method of using lapping tape coated with cubic boron nitride (CBN) abrasive grain to lap the raceway groove (raceway surface).[0006] Japanese patent publication No, Toku Kai Hei 3-84218 proposes a method of finish-grinding the circumferential seal groove of the races simultaneously when finish-grinding the inner-raceway surface and outer-raceway surface, using the same grinding abrasive.[0007] Recently, rolling bearings having very high resistance to wear, low ge...

Claims

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Application Information

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IPC IPC(8): F16C33/32B64G1/28F16C33/58F16C33/62F16C33/64
CPCF16C33/62F16C33/64Y10S451/901F16C2235/00
Inventor MATSUZAKI, HIROYUKI
Owner NSK LTD
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