| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing which generates sufficient dynamic pressure even though it is made of porous material. SOLUTION: Dynamic pressure grooves 1 are formed on an inner peripheral surface of a sleeve 3 made of porous material by means of rolling process. The dynamic grooves 1 are airtightly formed by this rolling process, while crushing gaps on the surface of the grooves 1 made of the porous material. The inner peripheral surface formed with the dynamic pressure grooves 1 is subjected to sizing for crushing a bearing surface 2 of the sleeve 3, thereby, gaps are substantially eliminated. |
