Patent ID: 6971351
Filing Date: 2005-12-06
Classification: F01L

Abstract:
1. A valve timing adjusting device comprising: a first rotor rotating synchronously with a crankshaft of an internal combustion engine; a second rotor secured on an end face of an intake camshaft of the engine or an exhaust camshaft, and provided relatively rotatably within the first rotor by a predetermined angle; a rotation regulating member provided within one of the first rotor and the second rotor, for regulating a relative rotation between the first rotor and the second rotor when the relative position reaches a predetermined position; and an engaging hole having an internal surface that is formed from the other one of the first rotor and the second rotor, for receiving an engagement of the rotation regulating member when the relative rotation between the rotors is being regulated; wherein surface treatment is given to the internal surface of the engaging hole and a surrounding lip area of an opening of the engaging hole, and wherein the surface treatment does not extend past a lip of the engaging hole, such that an additional area is provided on the one of the first rotor and the second rotor having the engaging hole that encircles said surrounding area and does not include the surface treatment.