Exhausting noise silencing structure for outboard engine

Abstract

Abstract PURPOSE: To minimize exhausting noise by restraining rapid expansion of exhaust, by arranging such that the exhaust gases are made to pass through cooling water before emission to the atmosphere. CONSTITUTION: When an engine 7 is operating at a low speed, the outboard engine unit is held deep into water to suffer a large backpressure, and therefore, exhaust comes out from an opening on the bottom side of an exhaust introducing pipe 15 or an exhausting hole 36 to an exhaust expansion chamber 16, and after being deflected upwards in the chamber, it flows into an exhaust introducing path 31, and through this connecting hole 32, it is discharged into engine- cooling water in a reservoir 24. And, after passing through the engine-cooling water, this exhaust is discharged into a top space 29, and it is discharged from this space into the atmosphere through a low-speed exhausting hole 34. And therefore, it is possible to control rapid expansion of the exhaust, reduce exhausting noise to low level and improve noise-preventing effect. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Ryoji Nakahama

Bibliographic Details