DYNAMIC PRESSURE TYPE BEARING UNIT

摘要

PROBLEM TO BE SOLVED: To provide a low-torque dynamic pressure type bearing unit having high durability and shock resistance. SOLUTION: A radial bearing surface 10a having a plurality of dynamic pressure grooves is formed in the internal circumference of a bearing member 7 composed of oil containing sintered metal, and a shaft member 2 comprising a shaft part 2a and a flange part 2b is inserted in the internal circumference of the bearing member 7. The shaft member 2 is formed of ceramic formed with a hollow hole formed in its surface. A bearing clearance is formed between both end faces of the flange part and its opposed surfaces 11a and 11b, so as to provide a thrust bearing part.