Dual path exhaust pipe for mounting an oxygen sensor
US4745742A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1987 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Aug 17, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1456
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A dual exhaust pipe segment for mounting an oxygen sensor is connected to a dual exhaust manifold of an internal combustion engine. The exhaust pipe segment comprises a communicating portion where the two paths communicate with each other. The communicating portion defines an oxygen sensor mounting location. The exhaust pipe further comprises tapered inwardly facing surfaces upstream of the oxygen sensor installing position. Tapers of the tapered inwardly facing surfaces are determined such that extension of the tapered inwardly facing surfaces tangentially contact an outside surface of the oxygen sensor. As a result of this structure, almost all gas flowing from every cylinder of the engine can contact the oxygen sensor, and the temperatures of gas contacting the oxygen sensor are decreased to an appropriate extent relative to a sensor mounting location inside the dual exhaust manifold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.