Motor vehicle exhaust pipe

摘要

A motor vehicle exhaust pipe includes: an outer metal tube; at least one inner tube made from an inorganic matrix composite material and disposed inside the outer metal tube, each inner tube being arranged longitudinally and having a pre-determined longitudinal length and a gap being provided between each inner tube and the outer tube; and elements for maintaining each inner tube in position in relation to the outer tube. The elements for maintaining each inner tube in position in relation to the outer tube include at least one retaining element disposed in the gap between the inner tube and the outer tube, each retaining element exerting a minimum pressure of between 10−4 MPa and 10−1 MPa on the inner tube. All of the elements used to maintain one inner tube in position have a cumulative longitudinal length equal to less than half of the longitudinal length of the inner tube.