FLUID BEARING DEVICE AND GRINDING WHEEL SPINDLE DEVICE FOR GRINDER USING FLUID BEARING DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent a bearing from heating while holding the rigidity of the bearing in a fluid bearing device 10 journaling a rotary shaft 20 by a fluid pressure. SOLUTION: A bearing member 2 of this fluid bearing device 10 is provided with a U-shaped static pressure pocket 4 generating a dynamic pressure in the direction acting a loading force to the rotary shaft 20 and requiring the high rigidity and rectangular static pressure pockets 6 in the other directions. The U-shaped static pocket 4 can hold the necessary rigidity and support the loading force acting on the rotary shaft 20. On the other hand, the rectangular static pressure pockets 6 have large areas so that chances of the rotary shaft 20 being in contact with the cooled lubricating oil are increased so as to prevent it from heating.