Patent ID: 6595893
Filing Date: 2003-07-22
Classification: B60K,Y10T

Abstract:
A freeing mechanism for a motorized gear reducer comprising:a driving motor; an input rotary shaft coupled to the driving motor; first and second external gears meshing with each other; and a movable shaft member selectively coupling the first external gear to the input rotary shaft, wherein the movable shaft member is axially movable between first and second positions relative to the input rotary shaft and the first external gear so that the movable shaft in the first position is engaged with both the input rotary shaft and the first external gear to establish an integral rotation condition, and the movable shaft in the second position is engaged with one of the input rotary shaft and the first external gear but disengaged from the other of the input rotary shaft and the first external gear to establish a free rotation condition, the movable shaft member has first and second splines, and a first non-engaging portion adjacent the second spline, said one of the input rotary shaft and the first external gear has a third spline constantly engaged with the first spline regardless of whether the movable shaft member is in the first position or the second position, and said the other of the-input rotary shaft and the first external gear has a fourth spline and a second non-engagement portion adjacent the fourth spline, the second non-engagement portion being longer than the second spline of the movable member, wherein the second spline of the movable shaft member in the first position is engaged with the fourth spline, and the second spline of the movable member in the second position is disengaged from the fourth spline and supported by the second non-engagement portion.