Manifold arrangement for outboard motor
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsHitoshi Watanabe, Noriyoshi Hirakoa, Masanori Takahashi
Life of this patent
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Abstract
An outboard motor having a multi-cylinder four-cycle, internal combustion engine as a power plant. An improved crankcase ventilating system is provided wherein the camshaft chambers and then to the intake system through an extended conduit passing over the exhaust manifold so as to reduce the emissions of hydrocarbons. The intake system is designed to preclude uneven distribution of the ventilating gasses. The intake system also is comprised of a plenum device, a plurality of runners and throttle bodies and an intake manifold that are attached as a unit to the rest of the engine body. Locating pins assist in this attachment.
Claims23
An internal combustion engine having a cylinder block with a plurality of vertically spaced cylinder bores, a cylinder head affixed to one end of said cylinder block so as to close one end of said cylinder bores, a crankcase member is affixed to the other end of said cylinder block so as to close the other end of said cylinder bores and to form a crankcase chamber in which a crankshaft is rotatably journaled, pistons slidably supported in each of said cylinder bores and connected to said crankshaft to drive the crankshaft, said pistons, said cylinder bores and said cylinder head forming combustion chambers of said engine, and an induction system for delivering at least an air charge to said engine combustion chambers, said induction system includes a vertically extending, elongated plenum chamber that is juxtaposed to said crankcase member and which has an air inlet opening formed in a side thereof, a plurality of runner sections extending from said plenum chamber to individual intake ports of said engine, said runner sections all extending along one side of said engine, said induction system comprised of at least said plenum chamber, said runner sections and a manifold that attaches to said individual intake ports of said engine connected as a unit and attached to the remaining engine body with the use of locating pins fixed to the engine body, said locating pins not extending through said manifold.
An internal combustion engine having a cylinder block with a plurality of vertically spaced cylinder bores, a cylinder head affixed to one end of said cylinder block so as to close one end of said cylinder bores, a crankcase member is affixed to the other end of said cylinder block so as to close the other end of said cylinder bores and to form a crankcase chamber in which a crankshaft is rotatably journaled, pistons slidably supported in each of said cylinder bores and connected to said crankshafts to drive the crankshaft, said pistons, said cylinder bores and said cylinder head forming combustion chambers of said engine, and an induction system for delivering at least an air charge to said engine combustion chambers, said induction system includes a vertically extending, elongated plenum chamber that is juxtaposed to said crankcase member and which has an air inlet opening formed in a side thereof, a plurality of runner sections extending from said plenum chamber to individual intake ports of said engine, said runner sections all extending along one side of said engine, said induction system comprised of at least said plenum chamber, said runner sections and a manifold that attaches to said individual intake ports of said engine connected as a unit and attached to the remaining engine body with the use of locating pins fixed to the engine body, each locating pin having a first end, which is coupled into the engine body, and a second end which extends into the manifold, the second end of at least one of the locating pins being unthreaded.
An outboard motor comprising a power head including an engine and a surrounding protective cowling that has a tray portion, said engine being mounted in said power head on an exhaust guide so that the crankshaft rotates about a vertically extending axis, the protective cowling including a tray portion having at least one generally upstanding wall lying next to a portion of the engine, the internal combustion engine having a cylinder block with a plurality of vertically spaced cylinder bores, a cylinder head affixed to one end of said cylinder block so as to close one end of said cylinder bores, a crankcase member affixed to the other end of said cylinder block so as to close the other end of said cylinder bores and to form a crankcase chamber in which a crankshaft is rotatably journaled, pistons slidably supported in each of said cylinder bores and connected to said crankshaft to drive the crankshaft, said pistons, said cylinder bores and said cylinder head forming combustion chambers of said engine, and an induction system for delivering at least an air charge to said engine combustion chambers, said induction system includes a vertically extending, elongated plenum chamber that is juxtaposed to said crankcase member and which has an air inlet opening formed in a side thereof, a plurality of runner sections extending from said plenum chamber to individual intake ports of said engine, said runner sections all extending along one side of said engine, said induction system comprised of at least said plenum chamber, said runner sections and a manifold that attaches to said individual intake ports of said engine connected as a unit and attached to the remaining engine body, said induction system attached to said engine body by means for locating said induction system on said engine body without removing the tray portion.
Dependencies are inferred from the claim text.