Patent ID: 6758597
Filing Date: 2004-07-06
Classification: F16C,G11B

Abstract:
A dynamic pressure bearing device, comprising:a cylindrical member for rotatably supporting a shaft member, wherein the cylindrical member is composed of a copper metal; and a lubricating fluid including benzotriazole, the lubricating fluid filling a bearing gap space formed between the cylindrical member and the shaft member and the lubricating fluid is in contact with at least the cylindrical member, wherein an anti-rust film of cupric benzotriazole is formed on a surface of the cylindrical member by reacting the copper metal of the cylindrical member with the benzotriazole in the lubricating fluid, and, as the anti-rust film is eliminated through operation of the bearing member, a new anti-rust film of cupric benzotriazole is formed through another reaction between the copper metal of the cylindrical member and the benzotriazole in the lubricating fluid.