Patent ID: 6763792
Filing Date: 2004-07-20
Classification: F01L,F02B

Abstract:
A four stroke internal combustion engine for an outboard motor comprising a cylinder block defining a first bank and a second bank with at least one cylinder bore defined in each cylinder bank, the cylinder bores extending generally horizontally, pistons reciprocating in the respective cylinder bores, cylinder head assemblies affixed to the cylinder block to define combustion chambers together with the cylinder bores and the pistons, a crankshaft coupled with the pistons, at least one intake valve cooperating with each one of the cylinder bores to admit an air charge into each one of the combustion chambers, a first intake camshaft actuating the intake valve of the first bank, a second intake camshaft actuating the intake valve of the second bank, at least one exhaust valve cooperating with each one of the cylinder bores to discharge burnt charge from each one of the combustion chambers, a first exhaust camshaft actuating the exhaust valve of the first bank, a second exhaust camshaft actuating the exhaust valve of the second bank, one of the first intake and exhaust camshafts and one of the second intake and exhaust camshafts being driven by the crankshaft through a primary transmitter, a first transmitter coupling the first intake and exhaust camshafts together such that the one first intake or exhaust camshaft, which is driven by the primary transmitter, drives the other one of the first intake and exhaust camshafts, and a second transmitter coupling the second intake and exhaust camshafts together such that the one second intake or exhaust camshaft, which is driven by the primary transmitter, drives the other one of the second intake and exhaust camshafts, the primary transmitter being disposed on one side of the cylinder block, the first and second transmitters being disposed on another side of the cylinder block, the one side and the another side of the cylinder block being separated by the cylinder bores.