Gearcase exhaust vent for a marine propulsion system
US4897061A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1988 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Aug 4, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H20/245
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A marine propulsion system in which exhaust is routed through an internal exhaust passage which includes a convergent area forming a restricted flow path includes a pressure relief opening formed adjacent the area of restricted exhaust flow for relieving exhaust pressure. One or more closure plates are connected adjacent the one or more openings to selectively control the passage of exhaust therethrough. The plates are biased toward a closed position in which exhaust is prevented from passing through the openings. The bias on the plates is designed so as to yield to a predetermined level of exhaust pressure within the exhaust passage at the area of restricted exhaust flow, to thereby relieve exhaust pressure build-up and improve the performance of the marine propulsion system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.