Patent ID: 9631751
Date: 2017-04-25
CPC Classifications: F01N,F16L

Claim:
1. A flexible tube for an exhaust pipe of an automobile, comprising: a bellows member made from a metal material in the shape of a hollow cylinder having corrugations which are repetitively formed in a wave form, wherein the bellows member has protrusion portions, a center portion, and two end portions; an interlocking member positioned in the bellows member with a predetermined gap from the bellows member and having a spiral groove spirally formed on the interlocking member so as to absorb deformation; an outer member surrounding the outside of the bellows member; cap members for coupling the outer cover member such that the outer cover member is fixed to an outside of both end portions of the bellows member; and intermediate members formed in the shape of a ring, of which one end is fixed to the bellows member and the other end is fixed to the interlocking member by overlapping the interlocking member inwards, wherein the protrusion portions have a uniform outer diameter, and the center portion has a maximum depression inner diameter which is larger than a minimum depression inner diameter of both end portions, and wherein the outer cover member is formed of an outer net with a network structure.