Variable valve device for internal combustion engines and valve timing control device

A valve timing control device for an internal combustion engine for varying operating characteristics of engine valves by changing a relative rotational phase of a second member to a first member comprising:

• an electric motor installed on the first member and configured to rotate the second member relatively to the first member through a motor output shaft;
• a speed reducer provided for reducing a rotational speed of the electric motor and for transmitting the reduced rotational speed to the second member;
• a cover member provided to cover at least a part of the electric motor;
• and
• a rotational angle detection mechanism comprising a detected unit provided on the motor output shaft and a detecting unit provided on the cover member so as to be opposed to the detected unit through a minute clearance for detecting a rotational angle position of the motor output shaft,
• wherein the cover member has a synthetic resin material and a reinforcing plate molded inside of the synthetic resin material and having a higher rigidity than the synthetic resin material.