Marine propulsion device exhaust system

US4687450A · kind A · utility

Inventors

• Gerald F. Bland · Glenview, US
• Stephen R. Johnson · Flower Mound, US

Key dates

• Filing date: Sep 22, 1986
• Grant date: Aug 18, 1987
• Expiry date: Sep 22, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B61/045
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A marine propulsion device comprising a water cooled internal combustion engine, a gimbal housing adapted to be mounted on a boat transom and including a front end, an exhaust opening in the front end, a first exhaust relief opening in the front end adjacent one side of the exhaust opening, a second relief opening in the front end adjacent the other side of the exhaust opening, an exhaust outlet, an exhaust conduit communicating between the exhaust opening and the exhaust outlet, a first exhaust relief passage communicating between the first exhaust relief opening and the atmosphere, and a second exhaust relief passage communicating between the second exhaust relief opening and the atmosphere, and an exhaust system communicating between the engine and the exhaust opening for conducting exhaust gases and coolant water away from the engine, and communicating between the engine and the first and second exhaust relief openings for conducting exhaust gases away from the engine.