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1. (WO2017154935) ROLLING BEARING, BEARING UNIT FOR AIR TURBINE, AND AIR TURBINE HANDPIECE FOR DENTAL USE

Pub. No.:    WO/2017/154935    International Application No.:    PCT/JP2017/009102
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Wed Mar 08 00:59:59 CET 2017
IPC: F16C 33/78
A61C 1/10
F16C 19/06
F16J 15/3204
Applicants: NSK LTD.
日本精工株式会社
Inventors: NAKAHARA Toru
中原 亨
YAMAMOTO Atsuhiro
山本 篤弘
MIYAZAKI Shoshi
宮▲崎▼ 翔士
Title: ROLLING BEARING, BEARING UNIT FOR AIR TURBINE, AND AIR TURBINE HANDPIECE FOR DENTAL USE
Abstract:
An axial end of the outer peripheral surface of the inner ring of a rolling bearing of a bearing unit for an air turbine has a sloped surface, the diameter of which changes from large to small toward the downstream side in the direction in which compressed air is supplied. A seal member does not have a metallic core, consists only of an elastic material, and has a base which extends radially and an elastically deformable lip section which extends from the radially inner end of the base and which is sloped to the downstream side in the direction in which the compressed air is supplied. When the compressed air does not act, the sloped surface of the lip section, which is located on the upstream side in the direction in which the compressed air is supplied, is in contact with the sloped surface of the inner ring. When the compressed air acts, the area of contact between the sloped surface of the lip section, which is located on the upstream side in the direction in which the compressed air is supplied, and the sloped surface of the inner ring is smaller than in the case in which the compressed air does not act.