Engine exhaust pipe
US5832723A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1995 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Dec 29, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N13/141
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The exhaust pipe of an engine has a double-wall structure consisting of an inner pipe and an outer pipe, and the inner pipe is spaced from the outer pipe with a predetermined clearance (heat insulating layer). The exhaust pipe includes a fitting for connecting other parts. At this fitting portion, the outer pipe has a outer hole. Likewise, the inner pipe has an inner hole. A nipple is situated on the outer pipe around the edge of the outer hole and is fixed to the outer pipe. An oxygen sensor is fitted to the nipple, and it extends through the inner hole of the inner pipe. A seal which is provided between the oxygen sensor and the flat portion of the inner pipe slidably contacts the step and the flat portion such that the fitting is unaffected by unequal thermal expansion between the inner and outer pipes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.