US 2010/0200099 A1Published application

Motor vehicle exhaust pipe

AssigneeFaurecia Systemes D'Echappement

InventorsVincent Leroy, Catherine Guyard, Sylvain Pellissard

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Abstract

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.

Claims20

Dependent claims

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),
characterised in that 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 10−1 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).

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 12/600,546Filed 16 May 2008
Priority: FR 07 5513018 May 2007
Published: 12 Aug 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F01N 13/16
Exhaust or silencing apparatus characterised by constructional features: selection of particular materials
F01N 13/102
Of exhaust manifolds: having thermal insulation
F01N 13/14
Exhaust or silencing apparatus characterised by constructional features: having thermal insulation
F01N 2310/02
Selection of sound absorbing or insulating material: mineral wool, e.g. glass wool, rock wool, asbestos or the like