Patent ID: 7096608
Filing Date: 2006-08-29
Classification: E01H,Y10T

Abstract:
1. An overload prevention device for an auger transmission of a snow removing machine for preventing an excessive load from acting on a power train of the auger transmission from an engine to an auger and an auger shaft of the snow removing machine, the overload prevention device comprising: a worm wheel meshing with a worm formed on an input shaft of the auger transmission, the worm wheel having a plurality of wheel protrusions formed at a side surface thereof; a cylindrical member integrally connected to the auger shaft and engaging with the worm wheel for rotation therewith over a predetermined torque range and for rotation relative thereto when a predetermined torque is exceeded; a generally disk-shaped member disposed adjacent to the worm wheel for restricting a rotating angle of the cylindrical member, the disk-shaped member having a plurality of generally disk-shaped protuberances facing the wheel protrusions of the worm wheel; a detector for outputting a detection signal each time the detector detects movement of the disk-shaped member away from the side surface of the worm wheel when the protuberances of the disk-shaped member ride on the wheel protrusions of the worm wheel responsive to rotation of the cylindrical member and the worm wheel relative to one another, the detector having an ON state corresponding to a state during which the detector outputs the detection signal and an OFF state corresponding to a state during which the detector does not output the detection signal; a control unit for stopping operation of the engine when the detector outputs the detection signal a preselected number of times within a preselected time period; and a stopper member for temporarily stopping movement of the disk-shaped member to restore the detector to the OFF state from the ON state.