Exhaust arrangements for marine propulsion devices
US9470130B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2014 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Dec 25, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2590/021
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An internal combustion engine and a method of forming an internal combustion engine are for a marine propulsion device. A first engine casting defines a first flow passage configured to receive the exhaust gases from a piston-cylinder. A die cast second engine casting defines a second flow passage that is configured to receive the exhaust gases from the first flow passage and convey the exhaust gases to a catalyst. The second flow passage has an upstream first leg that is parallel to the first flow passage and a downstream second leg that is transversely oriented to the first leg. An inside corner is between the first and second legs. The second flow passage has an inlet end that is configured to receive exhaust gases from the first flow passage. The first flow passage has an outlet end that is configured to convey exhaust gases to the inlet end of the second flow passage. The outlet end of the first flow passage is sized smaller than the inlet end of the second flow passage so that exhaust gases are directed away from the inside corner as the exhaust gases travel from the outlet end of the first flow passage to the inlet end of the second flow passage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.