Patent ID: 8261778

Claim:
Motor vehicle exhaust pipe, the pipe ( 10 ) comprising: an external metal tube ( 14 ); at least one internal tube ( 16 ) of a composite material having an inorganic matrix which is arranged inside the external metal tube ( 14 ), the or each internal tube ( 16 ) extending longitudinally and having a predetermined longitudinal length, a gap ( 24 ) being arranged between the or each internal tube ( 16 ) and the external tube ( 14 ); means ( 18 ) for fixing the or each internal tube ( 16 ) in position relative to the external tube ( 14 ), wherein the means ( 18 ) for fixing each internal tube ( 16 ) in position relative to the external tube ( 14 ) comprise at least one fixing element ( 34 , 36 ) which is arranged in the gap ( 24 ) between the internal tube ( 16 ) and the external tube ( 14 ), the or each fixing element ( 34 , 36 ) applying to the internal tube ( 16 ) a minimum pressure of between 10 −4 MPa and 10 −4 MPa, all the elements ( 34 , 36 ) contributing to fixing in position the same internal tube ( 16 ) having a cumulative longitudinal length of less than half of the longitudinal length of the internal tube ( 16 ).