Valve-timing control apparatus for internal combustion engine

摘要

A valve-timing control apparatus includes a drive rotator configured to receive a rotation from a crankshaft; a driven rotator fixed to a cam shaft; and an electric motor. The electric motor includes a stator fixed to the driven rotator, a rotor that rotates relative to the stator, a coil provided to at least one of the stator and the rotor, and a motor output shaft fixed to the rotor. The valve-timing control apparatus further includes a speed-reduction mechanism; a slip ring provided to one of the drive rotator and a fixed member, and configured to feed power to the coil; a power-feeding brush provided to another of the drive rotator and the fixed member, and abutting on the slip ring; a detection-target section provided to one of the fixed member and the motor output shaft, and located on an inner circumferential side beyond a contact portion between the slip ring and the power-feeding brush; and a detecting section provided to another of the fixed member and the motor output shaft, and configured to detect a rotational position of the motor output shaft by detecting a position of the detection-target section.

主权项

1. A valve-timing control apparatus for an internal combustion engine, comprising:
a drive rotating member configured to receive a rotational force from a crankshaft; a driven rotating member fixed to a cam shaft; an electric motor including
a stator fixed to the driven rotating member,a rotor configured to rotate relative to the stator,a coil provided to at least one of the stator and the rotor, and configured to rotate the rotor relative to the stator by energization, anda motor output shaft fixed to the rotor; a speed-reduction mechanism configured to reduce a rotational speed of the motor output shaft and to transmit the reduced rotational speed of the motor output shaft to the driven rotating member; a slip ring provided to one of the drive rotating member and a cover member facing the drive rotating member, and configured to feed electric power to the coil; a power-feeding brush provided to another of the drive rotating member and the fixed member, and being in contact with the slip ring; a detection-target section provided to a tip side of the motor output shaft, and located on an inner circumferential side of the valve-timing control apparatus beyond a contact portion between the slip ring and the power-feeding brush; and a detecting section fixed integrally to the cover member, and located radially inward of the slip ring wherein the detecting section is configured to detect a rotational position of the motor output shaft by detecting a position of the detection-target section.