Patent ID: 6682454
Filing Date: 2004-01-27
Classification: F16D,F16H

Abstract:
A planetary gear reduction device with a torque limiter function, comprising:(a) a housing; (b) an input shaft commonly service by an output shaft of a power source, rotatably supported by one ef end of said housing, located at a radially central and axially lower portion of said housing and adapted to take in a torque from the power source; (c) an output shaft rotatably supported by the other end of said housing, located at a radially central and axially upper portion of said housing and adapted to take out the torque transmitted from the power source; (d) a reduction gear train provided between said input shaft and said output shaft comprising a plurality of gears meshing with one another; and (e) a built-in torque limiting mechanism constituted in said reduction gear train, said torque limiting mechanism comprising: a planetary bevel gear which is one gear of said reduction gear train; a flange gear mounted to said output shaft freely in an axial direction and fixedly in a circumferential direction and meshing with said planetary bevel gear through inner teeth formed on a beveled lower end surface thereof; and a compression means provided between an upper surface of said flange gear and a lower surface of an upper lid of said housing and adapted to constantly press said flange gear toward said planetary bevel gear, whereby when an excessive torque is generated in said output shaft, said planetary bevel gear and said flange gear are disengaged from each other by a reaction force generated between respective teeth of those gears meshing with each other so as to disconnect torque transmission from said input shaft to said output shaft.