Camshaft bearing structure for over-head camshaft type internal combustion engine

摘要

Problem to be Solved: There will be provided camshaft bearing structure for an overhead camshaft type internal combustion engine capable of easily securing rigidity of the camshaft and preventing beating noise from occurring.;Solution: Camshaft bearing structure for an overhead camshaft type internal combustion engine, in which on a covered surface of the cylinder head(5), a camshaft(21)is axially supported, disposed and is covered with a head cover, characterized in that the camshaft(21)is provided with a cam chain sprocket(27), adj acent to the cam chain sprocket(27), there is formed a bearing portion (41) on a covered surface of the cylinder head(5), and a journal portion (25) to which the camshaft (21) corresponds is axially supported so as to be sandwiched between the bearing portion (41) and the bracket (51).