Patent ID: 6543401
Filing Date: 2003-04-08
Classification: F01L,F02B

Abstract:
A crankcase for an internal combustion engine of the type comprising twin cylinders arranged in a vee in a plane normal to the axis of the crankshaft of said engine, wherein said crankcase includes a camshaft drive mechanism comprising a first camshaft for actuating inlet and exhaust valves of one of said cylinders and a second camshaft for actuating inlet and exhaust valves of the other of said cylinders, which camshafts rotate on axes parallel to the axis of said crankshaft with said camshafts being driven by a gear on said crankshaft which engages a primary gear on said first camshaft with an adjacent secondary gear on said first camshaft imparting counter-rotation on said second camshaft via an identical secondary gear on said second camshaft; and wherein said crankcase casting includes tappet blocks as integral components of said casting.