Patent ID: 6782770
Filing Date: 2004-08-31
Classification: F02N,Y10T

Abstract:
A starter motor, comprising:an electric motor; a planetary gear device for reducing a rotational speed of the electric motor, the planetary gear device including an annular member having a cylindrical portion that has an internal gear formed on an inner surface thereof; a separating plate separating the planetary gear device from the electric motor and contacting an axial end surface of the cylindrical portion; a depressed portion for retaining lubricant therein, the depressed portion being formed on the axial end surface of the cylindrical portion; and a shock-absorbing device including a rotatable disc connected to the annular member, wherein the rotatable disc rotates together with the annular member that rotates relative to the separating plate when an excessive rotational torque exceeding a predetermined level is applied to the planetary gear device, thereby absorbing the excessive rotational torque.