SPEED INCREASING/DECREASING GEAR HAVING PLANETARY GEAR MECHANISM

摘要

PURPOSE:To reliably engage an inner pin with an external gear and to smooth rotation of an eccentric cylindrical roller by interposing an eccentric cylindrical roller between the external gear and inner pin of a speed increasing/decreasing gear and providing an external gear engaged with an outer pin on the eccentric roller. CONSTITUTION:A frame 8 is fixed, and when an input shaft 9 is rotated, eccentric portions 21a, 21b of an eccentric element 20 engaged with the input shaft 9 are rotated with eccentricity. Thus, external gears 14a, 14b are decelerated and rotated on its axis in the opposite direction to the rotation of the input shaft 9 while revolving in engagement with a pin 17. The decelerated rotation of the external gears 14a, 14b is output to an output shaft 3 through an inner in 6. An eccentric cylindrical roller 12 transmits torque from the external gears 14a, 14b to all inner pins 6 to smooth rotation. At this time, an external gear 18 of the eccentric roller 12 is rotated in engagement with the pin 17, so that the eccentric cylindrical roller 12 is rotated stably to further improve an effect of smoothing rotation.