Outboard engine with resonance-avoiding exhaust housing
US6350166B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 2000 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | May 15, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2590/021
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A propulsion system for a boat has a powerhead or a motor with an exhaust port for exhaust gases. The exhaust gases are exhausted through the propeller hub via an exhaust housing. The exhaust housing is a walled enclosure having an inlet, an internal volume in flow communication with the inlet, and an outlet in flow communication with the internal volume. The exhaust housing further includes hollow structures for dividing a portion of the internal volume into a plurality of flow channels which extend in side-by-side relationship. The transverse dimensions of each flow channel is substantially less than the transverse dimensions of the walled enclosure. The result is that standing waves are shifted to a higher frequency range. The hollow dividing structures have internal volumes which communicate with space external to the exhaust housing via openings in the walled enclosure, which allow the admission of a cooling medium. The hollow structures increase the stiffness of the walled enclosure of the exhaust housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.