Patent ID: 9534686
Date: 2017-01-03
CPC Classifications: F16H

Claim:
1. A continuously variable transmission device, comprising: an input member rotated and driven by an engine or electric motor; a toroidal continuously variable transmission comprising: at least a pair of disks, plural power rollers, and a hydraulic pressure device; a differential gear unit comprising a combination of gears engaged with each other, two input sections, and an output section; the differential gear unit outputting a differential component between the powers that are inputted to the input sections through the output section; an output member rotated and driven by the output section of the differential gear unit and transmitting power from the output section to a driven member; a clutch device for changing a transmission ratio between the input member and the output member by switching power transmission states of the differential gear unit; a control valve device comprising: a pressure adjustment valve for adjusting hydraulic pressure introduced into a hydraulic pressure chamber of the pressure device; and a switching valve for adjusting hydraulic pressure inside a hydraulic pressure chamber of the clutch device and switching connection states of the clutch device; and a controller for controlling the control valve device, at least one valve of the pressure adjustment valve and the switching valve being a solenoid valve for adjusting the hydraulic pressure inside the hydraulic pressure chamber of the pressure device or the clutch device, which connects to a hydraulic pressure introduction path that is provided with the at least one valve, by adjusting an aperture of the solenoid valve set according to a duty cycle, which is a ratio of current flowing time to a solenoid of the solenoid valve per unit time; and the controller having a function that, when changing the aperture of the solenoid valve beyond a specified value to a desired aperture at which the hydraulic pressure inside the hydraulic pressure chamber of the pressure device or the clutch device can be adjusted to a desired value, adjusts the aperture of the solenoid valve beyond the desired aperture to a state in which the aperture of the solenoid has been changed a maximum amount according to a changing direction of the aperture, and then, after a specified amount of time, returns the aperture of the solenoid vale to the desired aperture.