发明名称 DYNAMIC PRESSURE BEARING
摘要 PURPOSE: To reduce the static electricity generated at sliding time while ensuring stable performance by forming a dynamic pressure bearing of sintered material with specified Young's modulus and a volumetric specific resistance value, to increase rigidity and to reduce deformation. CONSTITUTION: A bearing device comprises a shaft 1, dynamic pressure thrust bearing 2 and a sleeve 3, to rotate the sleeve 3 with the shaft 1 serving as the fixed axis. A herringbone-shaped groove 4a is formed in a surface of the shaft 1 mutually opposed to an internal periphery of the sleeve 3. The dynamic pressure thrust bearing 2 is formed of sintered material having 300GPa or higher Young's modulus and a 10<6> &Omega;.cm or less volumetric specific resistance value, to use a metal of stainless steel or the like in the shaft 1. Further, the sintered material is preferable mainly composed of Al2 O3 , to use Al2 O3 -TiC system ceramics containing 20wt.% or more TiC. In this way, a stable dynamic pressure characteristic is obtained by decreasing deflection, in a dynamic pressure bearing, and further since static electricity can be released, reliability can be improved.
申请公布号 JPH08121467(A) 申请公布日期 1996.05.14
申请号 JP19940263646 申请日期 1994.10.27
申请人 KYOCERA CORP 发明人 NAKAHARA MASAHIRO
分类号 F16C17/02;C04B35/10;C22C29/00;F16C33/24 主分类号 F16C17/02
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