Patent ID: 7210436
Filing Date: 2007-05-01
Classification: A01D,F01L

Abstract:
1. A four-stroke internal combustion engine comprising at least one cylinder for a reciprocating piston which acts via a connecting rod on a crankshaft and at least one overhead camshaft for driving overhead gas exchange valves and a transmission between crankshaft and camshaft with a motion plane within a transmission chamber which is perpendicular to a crankshaft axis, wherein at least one camshaft bearing for bearing the camshaft is configured as a tunnel bearing, with a bore of a bearing block of at least one camshaft bearing comprising substantially at least one recess corresponding to a shape of a cam, wherein the recess is arranged in a minimally stressed bearing region of the bearing bore, and wherein a timing gear for driving the camshaft is arranged at an end of the camshaft which is averted from the bearing block with the recess and is fixedly joined thereto, with the timing gear simultaneously securing the axial position of the camshaft.