Patent ID: 7601088
Filing Date: 2009-10-13
Classification: F16H

Abstract:
1. A continuously variable transmission comprising: a toroidal continuously variable transmission; a planetary gear transmission; and a clutch device comprising: wherein when the mode of the clutch device is switched between the low-speed mode and the high-speed mode, in order to ensure a time period during which both the clutches are kept in engagement concurrently, after one of the low-speed and high-speed clutches which had been in disengagement until then is engaged, the control unit disengages the other of the clutches which had been in engagement until then, the control unit estimates a time delay in response which is considered to be necessary from a beginning to an end of the engagement of the one clutch, and when switching the speed mode, based on the thus pre-obtained delay time, the control unit starts to engage the one clutch before a transmission ratio of the toroidal continuously variable transmission has reached an optimal value for switching the mode of the clutch device.