CONE-TYPE DYNAMIC PRESSURE BEARING DEVICE

摘要

PROBLEM TO BE SOLVED: To improve performance of a cone-type (conical type) dynamic pressure bearing device at a low cost and favorably. SOLUTION: An opening angleθ1 formed between a pair of generating lines at an inclined dynamic pressure surface of a shaft bush 21 relatively rotatably inserted into a bearing sleeve 13 is set to be larger than an opening angleθ2 formed between a pair of generating lines at an inclined dynamic pressure surface of the bearing sleeve 13 (θ1>θ2). High bearing hardness at a large diameter part can be efficiently utilized to provide bearing characteristics of further higher hardness. Reduction of floating quantity due to manufacturing error in the inclination dynamic pressure surface is thus reduced. Deregulation to manufacturing tolerance is thus enabled. COPYRIGHT: (C)2005,JPO&NCIPI