| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission ratio variable device that can reduce variations of preload applied from both sides of a bearing gear with a simple configuration.SOLUTION: A cylindrical preload adjustment plug 79 inserts a communication hole 67 axially brought into communication with the center of an inner ring 65 of a Z1 gear 61, a Z4 gear 62 and a center bearing 63. A male screw part 83 is formed in the circumference of one end of a preload adjustment plug 79, and screwed to a female screw part 84 formed in the inner circumference of a Z1 gear 61. A disc-shaped flange part 82 extended outside in the radial direction is formed in the other end, and axially presses a back face of a Z4 gear 62 through a thrust needle bearing 81. A locknut 80 formed of the female screw part 84 is screwed at the end part of the male screw part 83 with the Z1 gear 61 threadedly attached thereto, and the preload adjustment plug 79 is controlled to become loose. Thereby, the preload adjustment plug 79 is disposed in a predetermined position in the communication hole 67, and a predetermined preload is applied to the engagement part of a bearing gear 25. |
