Planetary-roller-type continuously variable transmission

摘要

Fine adjustment of the rotation speed ratio or intentional control of the rotation speed ratio is carried out, centered on a desired speed ratio, including 1:1, for the rotation speed ratio between an input shaft (10) and an output shaft (11). A planetary-roller speed-increasing mechanism (30) whose input shaft is a carrier (10a) and whose output shaft is a sun roller (35), a planetary-roller speed-reduction mechanism (40) whose input shaft is a sun roller (45) and whose output shaft is a carrier (11a), and a worm speed-changing mechanism (50) for rotationally driving a roller ring (44) in contact with planetary rollers (43) of the planetary-roller speed reduction mechanism (40) are provided in a housing (20). The output shaft (35) of the planetary-roller speed-increasing mechanism (30) and the input shaft (45) of the planetary-roller speed-reduction mechanism (40) are linked.