Patent attributes
An exhaust gas cooling system for an engine includes an exhaust gas conduit having an inner tube defining an exhaust gas passage and an exhaust coupler surrounding the inner tube and defining a cooling water passage together with the inner tube therebetween, and a water-lock coupled with a downstream end of the exhaust gas conduit through an exhaust gas conduit coupling section which extends from an upstream end of the water-lock. The exhaust gas conduit coupling section and the exhaust coupler are coupled with each other and the inner tube extends into the interior of the water-lock. A downstream end part of the inner tube can be formed to be a wide portion having a bell mouth configuration. A diameter of the downstream end part becomes larger as a portion thereof exists closer to the end of the downstream end part. The exhaust gas cooling system for the engine can be provided for a water vehicle.
