Patent ID: 8256161
Filing Date: 2012-09-04
Classification: E05F,E05Y

Abstract:
1. An automatic opening and closing apparatus which automatically opens and closes an opening and closing member provided in a vehicle, the apparatus comprising: an electric motor provided with a rotating shaft; a worm provided so as to be rotatable integrally with the rotating shaft; a worm wheel provided with a cylindrical concave portion that has an open end and a closed end, wherein the concave portion has an axial center and is recessed in an axial direction, and wherein the worm wheel is engaged with the worm in a gear portion provided on an outer circumference of the worm wheel; a gear case accommodating a reduction-gear mechanism constituted by the worm and the worm wheel; an output shaft rotatably supported concentrically with the worm wheel and the gear case, wherein the worm wheel is rotatably supported relative to the output shaft and rotation of the worm wheel is transmitted to the output shaft; an output member fixed to a tip portion of the output shaft projecting outside the gear case to transmit rotation of the output shaft to the opening and closing member; a detection sensor disposed inside the gear case so as to be opposite to a magnet provided on a disk-shaped plate, and configured to detect rotation of the magnet, wherein the disk-shaped plate is fixed directly to the output shaft to rotate together with the output shaft, and wherein the magnet and disk-shaped plate are located inside the concave portion between the open end and the closed end; and control means connected to the electric motor and the detection sensor, wherein the control means is adapted to control activation of the electric motor based on a detection signal of the detection sensor.