DYNAMIC PRESSURE BEARING DEVICE, DYNAMIC PRESSURE BEARING MOTOR EQUIPPED WITH THIS DYNAMIC PRESSURE BEARING DEVICE, AND DISK DRIVING DEVICE EQUIPPED WITH THIS DYNAMIC PRESSURE BEARING MOTOR

摘要

PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device capable of satisfactorily ensuring a joint strength, a flexual strength, and the rigidity of a dynamic pressure bearing by ensuring a length of joining between constituent members sufficiently.;SOLUTION: This dynamic pressure bearing device has a shaft member 1 and a sleeve 2 rotating relatively for each other. A radial dynamic pressure bearing part 3 is formed between the outer peripheral face of a central shaft 11 and the inner peripheral part of a cylindrical part, and thrust dynamic pressure bearing parts 4, 5 are formed among one end face of the sleeve 2 and opposing faces in the axial direction of the shaft member 1. The sleeve 2 has a peripheral groove, and a cap-like cover 28 blocking the cylindrical part 21 of the sleeve 2 is provided on the other end side of the sleeve 2. The outer peripheral part of the cover 28 is joined with the sleeve 2 in the peripheral groove. A clearance in the axial direction is formed between the cover 28 and the shaft 11 and is filled with a lubricating fluid.;COPYRIGHT: (C)2010,JPO&INPIT