| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative pressure booster capable of reducing a manufacturing cost.SOLUTION: A seal member 60 can be attached to a bush 50 by fitting fitting protrusions 56 of the bush 50 to fitted holes 65 of the seal member 60. An annular protruding portion 23 of a rear-part shell half body 11b is engagedly fixed to engaging claws 52 of the bush 50, and the seal member 60 is supportedly attached to the bush 50. This allows the seal member and boots to be stably attached to a supporting cylindrical portion without forming the supporting cylindrical portion in a stepped shape, therefore reducing a manufacturing cost. |
