ROLLER BEARING FOR CRYOGENIC ENVIRONMENT

Japanese Patent JP2017150593

A

PROBLEM TO BE SOLVED: To perform a positive prevention of poor rotation of a roller bearing component element caused by a variation in size under cryogenic temperature in regard to a guide clearance or a radial inner clearance for use in supplying solid lubricant agent through contact with a cage by arranging a clearance between respective component elements at the time of assembly under normal temperature set in a specified range in order to prevent a poor rotation of a roller bearing used in the cryogenic state.SOLUTION: This invention relates to a roller bearing for cryogenic environment in which an inner ring 1 and an outer ring 2 are made of martensitic stainless steel or high speed tool steel, a rolling element 3 is a ceramics rolling element, a cage 4 is made of resin material and a clearance ratio C at a normal temperature (20°C) is 2.5 to 4. Provided that the clearance ratio C=(a diameter of the rolling element×a guide clearance)/(an outer diameter of the inner ring×a radial inner clearance) and the guide clearance in the formula is a clearance width between an outer diameter surface of the inner ring and an inner diameter surface of the cage and the radial inner clearance is a clearance width between the raceway of the outer ring and the surface of the rolling element. A variation in size about the guide clearance or the radial inner clearance for use in supplying solid lubricant agent under a cryogenic temperature through contact with the cage is restricted and the poor rotation of the bearing is positively prevented.SELECTED DRAWING: Figure 1

SUZUKI KOSUKE

JP2016034422A

August 31, 2017

February 25, 2016

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NTN TOYO BEARING CO LTD

F16C19/06; F04D7/02; F16C33/32; F16C33/44; F16C33/62

Naoya Kamata
Bunji Kamada
Yaichiro Nakatani

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