Patent ID: 6547687
Filing Date: 2003-04-15
Classification: F16H

Abstract:
A gear device which performs a speed-reduction of one stage using two gears disposed between an input shaft and an output shaft coaxially arranged, wherein a dynamic balance in an axial direction is secured for every individual rotating element, said rotating element including:a disk that has a circular recess portion arranged eccentric to said input shaft and that is fixed to said input shaft; a ring gear that is rotatably supported by said circular recess portion and whose rotating motion is restricted so that said ring gear only performs an eccentric motion within said circular recess portion when said disk is rotated; and a planetary gear that is fixed coaxially to said output shaft and engaged with said ring gear; wherein a weight portion is formed in said disk to recover the axial dynamic balance which is lost by arranging said circular recess portion and said ring gear.