Patent ID: 8727937
Filing Date: 2014-05-20
Classification: F16H

Abstract:
1. A toroidal continuously variable transmission comprising: an input disk that inputs drive power; an output disk that is provided coaxially with the input disk and outputs the drive power; a plurality of power rollers that are provided between the input disk and the output disk; a plurality of trunnions that rotatably supports the power rollers; an oil pump that operates synchronously with engine operation; a pressing hydraulic mechanism that moves and brings the input disk and output disk closer to each other in order to perform power transmission from the input disk to the output disk via the power rollers; a shifting hydraulic mechanism that moves the trunnions forward and rearward in order to move the power rollers between a neutral position and a shifting position; and a hydraulic control device that controls the pressing hydraulic mechanism and the shifting hydraulic mechanism by a pressure of a hydraulic oil supplied from the oil pump, wherein the hydraulic control device has an oil pressure regulation unit that sets an oil pressure in a shifting hydraulic line that is a hydraulic source of the shifting hydraulic mechanism to an oil pressure at which shifting control can be performed by the shifting hydraulic mechanism until the transmission of power between the input disk and output disk is interrupted when the operation of the oil pump is stopped, the oil pressure regulation unit includes an opening unit that opens a pressing hydraulic line that is a hydraulic source of the pressing hydraulic mechanism, the pressing hydraulic line is connected by an inflow port of the pressing hydraulic line to the oil pump, and the opening unit is an outflow port opening-closing valve that opens and closes an outflow port of the pressing hydraulic line, the outflow port opening-closing valve is open when the oil pump operation is stopped, and when the operation of the oil pump is stopped the oil pressure regulation unit sets the oil pressure in the shifting hydraulic line that is the hydraulic source of the shifting hydraulic mechanism to the oil pressure at which shifting control can be performed by the shifting hydraulic mechanism until an oil pressure in the pressing hydraulic line that is the hydraulic source of the pressing hydraulic mechanism is lowered by the outflow port opening-closing valve to become an oil pressure that interrupts the transmission of power between the input disk and output disk.