| 摘要 |
PROBLEM TO BE SOLVED: To mold highly accurately a housing having integrated side part and bottom part and a thrust dynamic pressure groove formed in the bottom part by resin injection molding without causing occurrence of bur and defective molding. SOLUTION: In an inner die 20, at least a molding face 21 molding an inner peripheral surface 7a1 of the side part 7a of a housing 7 and a groove molding face 22a molding the thrust dynamic pressure groove 7b10 in the bottom part 7b are formed into an integrated die. In a molding end face 22 of the inner die 20, a groove bottom molding face 22a1 molding a groove bottom of the thrust dynamic pressure groove 7b10 is flushly continued up to an outer diameter end part of the molding end face 22. COPYRIGHT: (C)2012,JPO&INPIT |
