Gearcase exhaust relief for a marine propulsion system
US4911665A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1988 |
| Grant date | Mar 27, 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
An exhaust relief outlet is provided in the lower end of a marine propulsion system lower unit for providing exhaust relief to an internal exhaust passage formed in the lower unit. The exhaust relief outlet is provided in the rear end of the lower unit and is disposed adjacent an area of restricted exhaust flow formed by converging walls of the internal exhaust passage. The exhaust relief outlet is located so as to discharge exhaust into the upper half of the path of the propeller as it rotates about a propeller shaft. The exhaust relief outlet both relieves exhaust pressure within the exhaust passage and provides controlled ventilation to the propeller for allowing increased acceleration and planning ability for a marine propulsion system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.