| 摘要 |
PURPOSE:To secure the airtight seal performance around a bolt hole on a booster shell. CONSTITUTION:The inner surface of the bolt hole peripheral edge part (b) of a booster shell 1 is closely attached on the outer peripheral surface of the conical truncated part 31 of a bolt head 38 by the squeezing flange 34 of a connecting bolt 25 which is formed through the caulking work. Further, a ridge part (c) between the outer surface of the bolt hole peripheral edge part (b) and the inner peripheral surface of a bolt hole 33 is allowed to bite on the squeezing flange 34. |
