Patent attributes
A lubrication structure for a camshaft with variable valve timing includes an advance hole, which includes an advance flow passage formed in a camshaft body. An end of the camshaft is attached to a continuously variable valve timing. A retard hole, which includes a retard flow passage, is formed in the camshaft body and spaced horizontally from the advance hole. A divergence flow passage has an end that surface-contacts the camshaft and is extended to communicate with the retard hole at an upper surface of a mounting part of a cylinder head. The other end of the divergence flow passage communicates with the slip surface on which the camshaft lays via a counter bore, so as to prevent lubrication film from being broken by load of the sprocket at an engine idle state or at an initial stage of cold starting.
