| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing which can be used in regular and reverse rotation directions. SOLUTION: A bearing sleeve 3 is formed out of sintered metal. A dynamic pressure groove zone A1 generating dynamic pressure action at a time of regular rotation and a dynamic pressure groove zone A2 generating dynamic pressure action at a time of reverse rotation are formed on an inner circumference of the bearing sleeve 3 in different shapes. Non-contact support in a radial direction of a shaft member 2 in the regular and reverse rotation direction is established by dynamic pressure action of fluid generated in a radial bearing gap between an outer circumference 2a of the shaft member 2 and the dynamic pressure groove zones A1, A2 on the inner circumference of the bearing sleeve 3 at a time of rotation of the shaft member 2. COPYRIGHT: (C)2006,JPO&NCIPI
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