Outboard motor and engine thereof

An outboard motor, comprising an engine having a crank chamber and mounted at an upper portion of an outboard motor body case which is swingable about a tilting shaft, with a crankshaft of said engine being accommodated in said crank chamber so as to be directed in a vertical direction, wherein said crankshaft is provided with a flywheel at a lower end thereof which protrudes downwardly from said crank chamber, said flywheel being accommodated in a chamber which is fully separated from said crank chamber by a separation means,

• wherein said crankshaft is arranged at a forward end of said outboard motor body case nearest said tilting shaft, and
• wherein said outboard motor body case is supported by a connecting member which is swingable about said titling shaft, and said flywheel is disposed between said connecting member and said engine body.

An outboard motor comprising an engine having a crank chamber and mounted at an upper portion of an outboard motor body case which is swingable about a titling shaft, with a crankshaft of said engine being accommodated in said crank chamber so as to be directed in a vertical direction, wherein said crankshaft is provided with a flywheel at a lower end thereof which protrudes downwardly from said crank chamber, said flywheel being accommodated in a chamber which is fully separated from said crank chamber by a separation means,

• wherein said crankshaft is arranged at a forward end of said outboard motor body case nearest said tilting shaft, and
• wherein said outboard motor further comprises a ring gear provided around an outer periphery of said flywheel, and a starter provided in a downwardly directed manner below one side of said engine body so as to mesh with said ring gear.

An engine having a crank chamber and a crankshaft provided in said crank chamber so as to be directed in a vertical direction, comprising a flywheel provided at a lower end of said crankshaft which protrudes from said crank chamber, and an engine mount case coupled to a lower surface of said crank chamber for mounting said engine, said engine mount case having a peripheral wall which extends to a position below the flywheel to define a chamber surrounding at least a portion of the periphery of said flywheel, said chamber for said flywheel being separated from said crank chamber by a separation means,

• wherein a shaft is provided and driven by said engine, said shaft having an upper end portion which is provided with a radially outwardly extending flange, said flange and an inner peripheral portion of said flywheel being superposed with each other and fixed together to an end face of said lower end of the crankshaft by a bolt means.

An outboard motor comprising an inline or V-type engine mounted at an upper portion of an outboard motor body case which is swingable about a tilting shaft, and a driving shaft driven by the engine, a crankshaft of said engine being directed in a vertical direction and being located at a forward portion of the outboard motor body case, wherein said crankshaft is disposed in a crank chamber and is provided with a flywheel at a lower end thereof which protrudes downwardly from an engine body of said engine into a chamber separated from said crank chamber, and wherein said driving shaft has an upper end portion which is provided with a radially outwardly extending flange, said flange and an inner peripheral portion of said flywheel being superposed with each other and fixed together to an end face of said lower end of the crankshaft by a bolt means.