Cilindrisch dynamisch druklager.

摘要

A dynamic pressure bearing has a cylindrical configuration and includes dynamic pressure generating grooves on its inner peripheral surface. The bearing which is injection-molded is made of a material consisting principally of a polyphenylene sulfide resin including glass fibers. Furthermore, the bearing has an outside diameter R and an inside diameter r set such that a ratio R/r of the outside diameter R to the inside diameter r falls within a range of 1.2</=R/r</=2.5. The bearing also has an axial length L satisfying L</=3r.