Patent ID: 7131409

Claim:
A valve timing change apparatus for changing open-close timing of an intake valve or an exhaust valve of an internal combustion engine, by changing the relative angular position in the rotating direction between a cam shaft which drives said valve and a rotational drive member which receives rotational drive force of a crank shaft to rotate said cam shaft, comprising: an angle change mechanism configured to change and hold the relative angular position between said cam shaft and said rotational drive member by oil pressure; an oil pressure generating mechanism configured to generate oil pressure for driving said angle change mechanism by relative rotation; and a drive member configured to generate relative rotation at said oil pressure generating mechanism; wherein said angle change mechanism has a first rotary member integrally rotatable with said rotational drive member and a second rotary member integrally rotatable with said cam shaft; wherein said first rotary member and said second rotary member define an advancing oil chamber and a retarding oil chamber to and from which the operating oil is charged and discharged, to rotate said cam shaft to the advancing side or the retarding side against said rotational drive member; wherein said oil pressure generating mechanism has a rotor configured to define an expansion-compression room of the operating oil and to rotate integrally with said first rotary member, and a casing rotatably supported so that said rotor sucks and ejects the operating oil with relative rotation to said casing; and wherein said drive member has an electromagnetic coil for generating electromagnetic force to exert braking torque to said casing for suppressing rotation.