Patent ID: 8042508
Filing Date: 2011-10-25
Classification: F01L

Abstract:
1. A camshaft support structure for an internal combustion engine, comprising: a cylinder head; a camshaft provided with a cam for driving a valve element, the camshaft having an upper bearing side, a lower bearing side, and a journal portion; a lower bearing that supports the lower bearing side of the camshaft, the lower bearing side of the camshaft being closer to the cylinder head than the upper bearing side of the camshaft, the upper bearing side being opposite to the lower bearing side; a rocker arm that is installed in the cylinder head; and a head cover that is integrally provided with an upper bearing that supports the upper bearing side of the camshaft, and is provided with a visual observation window so that at least one of the rocker arm and the cam is viewable in a state where the head cover is fixed to the cylinder head, the upper bearing being a plurality of upper bearings, wherein each of the plurality of upper bearings has a semicircular portion to hold the journal portion of the camshaft, and at least part of the plurality of upper bearings are such that a top portion of the semicircular portion of one of the plurality of upper bearings is continuous with a top portion of the semicircular portion of an adjacent one of the plurality of upper bearings.