BEARING UNIT FOR DENTAL AIR TURBINE AND DENTAL AIR TURBINE

摘要

A dental air turbine includes a turbine blade, a rotating shaft which is integrally fixed with the turbine blade, and a pair of rolling bearings which rotatably support the rotating shaft with respect to a housing. The pair of rolling bearings are arranged back-to-back while fitting inner rings on the rotating shaft such that a preload is applied thereto. Accordingly, it is possible to reduce the sizes of the rolling bearings and to improve the moment rigidity of the rotating shaft.

主权项

1. A dental air turbine comprising:
a turbine blade; a rotating shaft which is integrally fixed with the turbine blade and includes one end to which a dental treatment instrument can be attached; and a pair of rolling bearings which support the rotating shaft rotatably with respect to a housing, wherein the pair of rolling bearings are arranged back-to-back while fitting inner rings of the pair of rolling bearings on the rotating shaft such that a preload is applied thereto.