Patent ID: 7699675
Filing Date: 2010-04-20
Classification: B63H

Abstract:
1. A marine exhaust system, comprising: a manifold structure; an elbow structure attached to said manifold structure; a manifold exhaust conduit formed within said manifold structure and configured to direct a flow of exhaust gas from an engine through a collection chamber to an outlet cavity; a manifold cooling jacket disposed around a substantial portion of said manifold exhaust conduit; an elbow exhaust conduit formed within said elbow structure and configured to direct a flow of exhaust gas from an inlet opening to an outlet opening, said elbow exhaust conduit being connected in fluid communication with said manifold exhaust conduit to direct said flow of exhaust gas from said outlet cavity to said inlet opening; an elbow cooling jacket disposed around a substantial portion of said elbow exhaust conduit; an obstruction disposed within said elbow cooling jacket, said obstruction being configured to divide said elbow cooling jacket into an inlet portion which surrounds a substantial portion of an inlet section of said elbow exhaust conduit and an outlet portion which surrounds a substantial portion of an outlet section of said elbow exhaust conduit, said obstruction having a passage formed therein to conduct fluid between said inlet portion and said outlet portion; and a gasket disposed between said manifold structure and said elbow structure, said gasket being configured to prevent fluid communication between said manifold cooling jacket and said elbow cooling jacket.