VARIABLE VALVE TIMING CONTROL APPARATUS

摘要

A variable valve timing control apparatus includes a driving-side rotation member rotating in synchronization with a crankshaft of an internal combustion engine, a driven-side rotation member integrally rotating with a camshaft of the internal combustion engine, an intermediate lock mechanism being selectively switchable between a locked state and an unlocked state, a plurality of hydraulic chambers, at least one of the plurality of hydraulic chambers being positioned at a lower side than an axis of the camshaft, a plurality of partition portions, each of the plurality of partition portions dividing each of the hydraulic chambers into an advanced angle chamber and a retarded angle chamber, an electromagnetic valve including a supply and discharge port that is positioned at an upper side than the axis of the camshaft and switching supply and discharge of fluid relative to the hydraulic chambers, and a pump supplying fluid to the electromagnetic valve.

主权项

1. A variable valve timing control apparatus comprising:
a driving-side rotation member rotating in synchronization with a crankshaft of an internal combustion engine; a driven-side rotation member arranged to be coaxial with the driving-side rotation member and integrally rotating with a camshaft for opening and closing a valve of the internal combustion engine; an intermediate lock mechanism being selectively switchable between a locked state in which a relative rotation phase of the driven-side rotation member relative to the driving-side rotation member is locked at an intermediate lock phase between a most advanced angle phase and a most retarded angle phase and an unlocked state in which the locked state is released; a plurality of hydraulic chambers formed between the driving-side rotation member and the driven-side rotation member, at least one of the plurality of hydraulic chambers being positioned at a lower side than an axis of the camshaft; a plurality of partition portions provided at one of the driving-side rotation member and the driven-side rotation member, each of the plurality of partition portions dividing each of the hydraulic chambers into an advanced angle chamber and a retarded angle chamber; an electromagnetic valve including a supply and discharge port that is positioned at an upper side than the axis of the camshaft and switching supply and discharge of fluid relative to the hydraulic chambers; and a pump supplying fluid to the electromagnetic valve.