Patent ID: 8897977
Filing Date: 2014-11-25
Classification: F16D,F16H

Abstract:
1. A transmission comprising a variator including an input and an output, a countershaft assembly operatively coupled to the output of the variator, an electro-hydraulic controller including a variator trim section, a variator logic section, a plurality of double-acting cylinders for varying the ratio through the variator, and a pressure transducer for measuring a pressure applied by the variator trim section, wherein the variator logic section includes at least one variator logic valve assembly moveable between first and second positions to change the flow path of pressurized fluid from the variator trim section between a first side of the double acting cylinders and a second side of the double acting cylinders, wherein the at least one valve assembly controls the flow of hydraulic fluid so as to prevent the application of a negative torque to the variator, wherein the variator trim section configured to vary the pressure of the pressurized fluid to control the position of the double acting cylinders, and wherein the electro-hydraulic controller is configured to respond to a change in the direction of torque applied to the output of the variator by the countershaft assembly to change the flow path of pressurized fluid between the first and second sides of the plurality of double acting cylinders.