Patent ID: 6378476
Filing Date: 2002-04-30
Classification: F01L

Abstract:
A valve timing adjusting device provided in a driving force transmission system which transmits a driving force from a driving shaft of an internal combustion engine to a camshaft which drives to open and close at least one of an intake valve and an exhaust valve, for adjusting opening-closing timing of at least one of said intake valve and said exhaust valve, comprising:a driving-side rotor rotating together with said driving shaft of the internal combustion engine, said driving-side rotor including a housing chamber therein; a driven-side rotor provided in said housing chamber and rotating together with said camshaft, said driven-side rotor including vanes partitioning said housing chamber into retard chambers and advance chambers, said driven-side rotor driven to rotate with respect to said driving-side rotor within a predetermined range of angle by a fluid pressure in said retard chambers and said advance chambers; a restraining means including a contacting portion provided within said driven-side rotor and a contacted portion provided within said driving-side rotor, said restraining means restrains a relative rotation of said driven-side rotor with respect to said driving-side rotor when said contacting portion contacts said contacted portion while said driven-side rotor is at a predetermined angle position, said restraining means further including an urging means for urging said contacting portion toward said contacted portion; a fluid chamber applying a fluid pressure to said contacting portion in a direction to cancel the contact between said contacting portion and said contacted portion; a damper chamber formed around said contacting portion for decreasing a speed of movement of said contacting portion toward said contacted portion, and a changeover means for opening said damper chamber when said driven-side rotor is positioned at an advance side over the predetermined angle position with respect to the driving-side rotor, and for hermetically sealing said damper chamber when said driven-side rotor is positioned at the predetermined angle position or at a retard side over the predetermined angle position.