Internal-combustion engine valve timing control device

An internal-combustion engine valve timing control device adapted to vary a relative rotational phase of a camshaft to a crankshaft by energizing an electric motor comprising:

• a cover member provided to cover at least a part of the electric motor;
• slip rings provided at one of the electric motor and the cover member;
• electricity-feeding brushes provided at the other of the electric motor and the cover member and having top ends kept in sliding-contact with the respective slip rings for electricity-feeding to the electric motor;
• a clearance space defined between the electric motor and the cover member and configured such that sliding-contact parts of the slip rings with the electricity-feeding brushes face onto the clearance space;
• a communicating hole formed in the cover member for communicating between the clearance space and an outside of the cover member;
• and
• a ventilation plug press-fitted into the communicating hole from the outside of the cover member,
• wherein the ventilation plug comprises:
• a plug main body having a ventilation hole formed to penetrate through the plug main body in an axial direction and an outer circumferential part configured to be fitted to and retained in an outer opening edge of the communicating hole;
• a fitting portion fitted into a recessed groove formed in an outside end face of the plug main body;
• and
• a ventilation filter located on a bottom face of the recessed groove, onto which the ventilation hole faces, and retained and sandwiched between the plug main body and the fitting portion.