| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a flexible tube capable of reducing a spring constant without causing a larger size while ensuring the number of years of durability at a corrosion resistant property similar to a conventional case and realizing weight and cost reduction. SOLUTION: In the flexible tube of a two-layer structure of an inner tube and an outer tube molded to a bellows shape, a plate thickness of the outer tube 2 is set to a thickness capable of ensuring a predetermined number of years of durability at a corrosion resistant property and a plate thickness of the inner tube 1 is set to a thinner thickness than that of the outer tube 2.</p> |
