| 摘要 |
<p>PURPOSE:To reliably perform reinforcement against negative pressure without deteriorating assembling workability and original flexibility of a bellows part. CONSTITUTION:Projecting parts 7 as the angled parts 4a on the outer surface of a bellows part 4 are respectively projected outward in the radial direction from the tops of angled parts from four positions uniformly separated from one another in the circumferential direction. Housing grooves 8 penetrating in the circumferential direction, and provided with inward surfaces facing inward in the radial direction are formed in respective projecting parts, and reinforcing rings 5 are laid in a state where they are housed in respective housing grooves, and the inward surface is brought in contact with the reinforcing rings 5 in acting of negative pressure, whereby the relative displacement inward in the radial direction is prevented. The housing grooves may be formed by angled parts and projecting flaps projecting from both side angled parts pinching a valley part.</p> |
