Patent ID: 9181846
Filing Date: 2015-11-10
Classification: F01N,F16L

Abstract:
1. A flexible tube for an exhaust pipe of an automobile, comprising: a bellows member made from a metal material, formed in the shape of a hollow cylinder, and having corrugations which are repetitively formed in a wave form on the bellows member, wherein the bellows member is provided with a center part and two end parts; an interlocking member positioned in the bellows member with a predetermined gap between the interlocking member and the bellows member and wherein the interlocking member has a spiral groove spirally formed thereon to absorb deformation; a braid member positioned such that the braid member surrounds the outside portion of the bellows member and is braided such that the braid member may be flexibly deformed with a large displacement with respect to a displacement and tension in a compression direction; cap members coupled such that the braid member is fixed to outside portions of both end parts of the bellows member; and intermediate members formed in the shape of a ring, each of which has one end thereof fixed to the bellows member and another other end thereof fixed to the interlocking member by overlapping the interlocking member inwards, wherein the bellows member has protrusion portions on the center part and both end parts, wherein the protrusion portions on the center part are uniformly and repetitively formed at their outer and inner diameters and wherein the protrusion portions on the center part have a maximum depression inner diameter D