Patent ID: 6450139
Filing Date: 2002-09-17
Classification: F01L,F02B

Abstract:
A valve timing control system for an internal combustion engine, comprising:a rotation control mechanism comprising a housing, and a vane rotor which is rotatably disposed inside the housing and has at least one vane section, the vane section defining a first chamber and a second chamber which are located on opposite sides of the vane section, a hydraulic pressure being selectively supplied to and released from the first chamber and the second chamber to controllably accomplish a relative rotation of the vane rotor to the housing, the vane rotor being formed at its axially end section with a depression; a first camshaft connected to the vane rotor by a cam bolt piercing the vane rotor along an axis of the vane rotor; a second camshaft disposed parallel with said first camshaft; a first driving force transmission member connected to one of a crankshaft and said second camshaft, the housing of said rotation control mechanism having said first driving force transmission member; and a second driving force transmission member installed to an end section of said first camshaft together with the vane rotor by the cam bolt and connected to the other of the crankshaft and said second camshaft, said second driving force transmission member comprising a generally cup-shaped section which has a cylindrical wall portion fitted on the end section of said first camshaft and fitted in the depression of the vane rotor, wherein the vane rotor of said rotation control mechanism and the generally cup-shaped section of said second driving force transmission member are fixed together to the end section of said first camshaft upon tightening the cam bolt.