Motor vehicle exhaust pipe
US8261778B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2008 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | May 8, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2310/14
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.