Patent ID: 6378475
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 an intermediate position between both ends in a circumferential direction of the predetermined range of angle, said restraining means further including an urging means for urging said contacting portion toward said contacted portion; an advance fluid passage being capable of supplying the fluid into said advance chambers and discharging the fluid therefrom; a retard fluid passage being capable of supplying the fluid into said retard chambers and to discharging the fluid therefrom; and a changeover means for changing over connection between said advance fluid passage and a fluid supply source or a drain, and for changing over connection between a retard fluid passage and said fluid supply source or said drain, wherein said changeover means is capable of simultaneously connecting said advance fluid passage with said fluid supply source, and said advance fluid passage with said drain.