| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid dynamic pressure bearing device for a dental handpiece and a dental handpiece, capable of eliminating the rolling sound and capable of being maintenance-free.SOLUTION: In the fluid dynamic pressure bearing device 10 for the dental handpiece, a cutting tool is attached and a rotating shaft driven by a turbine is rotatably supported at a case by a pair of bearing parts. The fluid dynamic pressure bearing device 10 includes: an outer member 20 including a radial bearing surface 29R and thrust bearing surfaces 23T and 23T formed at both ends of the radial bearing surface; and an inner member 11 disposed on the inside of the outer member 20, including a radial bearing surface 12R and thrust bearing surfaces 13T and 13T opposing the radial bearing surface 29R and thrust bearing surfaces 23T and 23T, respectively. A radial bearing gap R is formed between the radial bearing surfaces 29R and 12R of the outer member 20 and inner member 11 respectively, and a thrust bearing gap T is formed between the thrust bearing surfaces 23T and 13T. Lubricant oil is interposed in these bearing gaps R and T. |
