Patent ID: 8443772

Claim:
An electric valve timing control device of an internal combustion engine, comprising: a drive rotation member driven by a crankshaft of the engine; a driven rotation member rotatable relative to the drive rotation member and secured to a cam shaft of the engine to rotate together with the cam shaft; an electric motor arranged to rotate together with the drive rotation member, the electric motor producing a dynamic power when fed with an electric current through brushes; a housing arranged to rotate together with the drive rotation member and having the electric motor housed therein; a hollow control shaft received in the housing in a manner to be rotatable relative to the housing and rotated by the dynamic power of the electric motor; a speed reduction device that transmits a rotation of the hollow control shaft to the driven rotation member while reducing a speed of the rotation; and a bearing device arranged between a cylindrical outer surface of the driven rotation member and a cylindrical inner surface of the hollow control shaft, the bearing device including a plurality of rollers; wherein a lubrication oil feeding structure is provided for causing the rollers of the bearing device to be submerged in a lubrication oil at least when the engine is in operation.