Patent ID: 6708652
Filing Date: 2004-03-23
Classification: F01L

Abstract:
An engine valve timing transmission apparatus comprising:a timing chain engaging with a drive sprocket and a driven sprocket respectively fixed to a crankshaft and a valve camshaft; a chain tensioner, said chain tensioner having a first end press-contacted with an outer side surface of the timing chain to apply tension to the timing chain and swingably attached to an engine main body via a pivot pin; a timing chamber formed in a side wall of the engine main body for accommodating the timing chain; an opening having a diameter greater than the drive sprocket is provided on a side of the drive sprocket on an outer side wall of the timing chamber; a lid plate for covering the opening is removably secured to the engine main body; and a bearing boss projecting toward the timing chamber and integrally formed with the lid plate, said bearing boss rotatably supporting a rotor shaft of an oil pump.