| 摘要 |
PROBLEM TO BE SOLVED: To prevent the lowering of breaking load of a bellows while preventing movement of a deformation preventing ring by positioning heat contracting tubes at least two positions in the nearly radial direction between annular valley parts of the bellows and the deformation preventing ring so as to prevent the movement of the deformation preventing ring toward an annular ridge part of the bellows. SOLUTION: A bellows 20 is formed by vulcanizing the rubber material, in which a basic fabric is embedded, and provided with three annular ridge parts 21 and two annular valley parts between the ridge parts 21. A deformation preventing ring 30 is provided with four tubes 40. The tube 40 is made of rubber or the synthetic resin material. The heat contracting tubes 40 are heated for contraction so as to be tightly fitted to the deformation preventing ring 30. The heat contracting tubes 40 are distributed with a space as equal as possible. The deformation preventing ring 30 having the heat contracting tubes 40 is tightly fitted to the bellows 20 while bending the annular ridge parts 21 of the bellows 20. With this structure, movement of the heat contracting tubes 40 from the annular valley part as an original position toward the adjacent annular valley part.
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