Clutch control device of infinite variable speed ratio transmission

摘要

An output shaft (4) of a continuously variable transmission (2) which continuously varies the rotation of an input shaft (1) is joined to a sun gear (5A) of a planetary gear mechanism (5), and joined to a final output shaft (6) via a direct mode clutch (10). An output shaft (3C) of a fixed speed ratio transmission (3) which varies the rotation of the input shaft (1) at a fixed speed ratio is joined to a planet carrier (5B) of the planetary gear mechanism (5) via a power recirculation mode clutch (9). A ring gear (5C) of the planetary gear mechanism (5) is Joined to the final output shaft (6). Oil pressure supply to the direct mode clutch (10) and power recirculation mode clutch (9) is controlled by a controller (80) via a mode fixing valve (160). The speed ratio of the continuously variable transmission (2) is detected by a rotation speed sensor (81, 82). A cam (280) which moves in synchronism with a trunnion (23) of the continuously variable transmission (2) locks the mode fixing valve (160) in a position which shuts off oil supply to one of the clutches (9). (10) when the speed ratio of a continuously variable transmission (2) is smaller than a predetermined value lcC. and releases the lock when the speed ratio of the continuously variable transmission (2) is larger than the predetermined value lcC.