Patent ID: 6890275
Filing Date: 2005-05-10
Classification: F16H

Abstract:
1. In a continuously variable transmission for a motor vehicle, including a variator having a primary V-pulley set and a secondary V-pulley set, the primary V-pulley set having a movable primary V-pulley disk and the secondary V-pulley set having a movable secondary V-pulley disk wherein the movable primary V-pulley disk and the movable secondary V-pulley disk are both displaceable by hydraulic force to facilitate pressure control adjustment of the continuously variable transmission; wherein the movable primary V-pulley disk includes a primary pressure chamber with a first variable volume and the movable secondary V-pulley disks includes a secondary pressure chamber with a second variable volume, and wherein the movable primary and secondary V-pulley disks are loaded by oil flow provided via an electro-hydraulically controlled pressure supply apparatus wherein the oil flow to the movable primary V-pulley disk is supplied from a reservoir solely through a primary pulley pressure line and at least one primary pressure controller and the oil flow to the movable secondary V-pulley disk is supplied from a reservoir solely through a secondary pulley pressure line ( an oil recycling system for directly transferring pressurized oil volume between the pressure chamber of the V-pulley disk subject to a lesser actuation pressure and the pressure chamber of the V-Pulley disk subjected to a higher actuation pressure according to a difference between the lesser and higher actuation pressures to reduce a volume of oil transferred between the primary and secondary pressure chambers of the V-pulley disks and the oil reservoir during operation of the transmission, comprising: