| 摘要 |
PROBLEM TO BE SOLVED: To increase an inner diameter of a hollow hole of a hollow crank shaft and also assure rigidity, accuracy and pre-compression without increasing an outer diameter size of a speed reducer.SOLUTION: There are provided a first bearing 3b and a second bearing 3a to hold eccentric cylindrical parts 2b and 2a of a hollow cylindrical crank shaft 2 at an inner ring. An outer ring is installed at a first carrier 15 and a second carrier 16. Inner rings of a third bearing 17b and a fourth bearing 17a are fitted to the outer peripheries of the first and second carriers and then a frame 1 is held by the outer ring. Thin plate legs 22 with arcuate section and output pins 11 are fixed between the first and second carriers. The legs are integrally formed with the first carrier, outer screws 23 with outer peripheries of extremity ends of a plurality of legs as screw outer diameter are arranged at the extremity ends, the outer screws are protruded out through the second carrier, the second carrier is held to and fixed to the first carrier by inner screw members 18 threadably fitted to a plurality of outer screws and further the first to the fourth bearings are held. |
