Patent ID: 8434458

Claim:
A timing transmission mechanism in an engine, the timing transmission mechanism being for driving, by means of a crankshaft ( 4 ), a valve operating camshaft ( 13 b ) with predetermined timing and a high pressure fuel pump (P), characterized in that the timing transmission mechanism comprises a chain transmission system (C) formed from a drive sprocket ( 20 ) mounted on the crankshaft ( 4 ), a driven sprocket ( 25 ) mounted on a pump input shaft ( 24 ) of the high pressure fuel pump (P), which is disposed on one side of an engine main body ( 1 ) where the drive sprocket ( 20 ) is present, and a chain ( 22 ) wound around the drive sprocket ( 20 ) and the driven sprocket ( 25 ); and a gear transmission system (G) formed from a drive gear ( 26 ) mounted on the pump input shaft ( 24 ) coaxially with the driven sprocket ( 25 ) and a driven gear ( 27 ) mounted on the camshaft ( 13 b ) and meshing with the drive gear ( 26 ).