Importance

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Abstract

A hydraulic system for a transmission assembly includes a pump having a first and a second section to pressurize fluid to first and second pressure, respectively, and supply it to a clutch via a first supply line and to a variator via a second supply line, respectively. The system further includes an accumulator and a pressure relieving valve (PRV), both connected to first supply line for maintaining pressure in the first supply line. The system uses the PRV to maintain the second pressure by relieving oil from the second supply line or by reducing oil from the first supply line to the second supply line. The system further includes a first and second flow control valve. First valve restricts flow of fluid from the variator to the sump, and such restriction allows the fluid to flow towards the PRV for being supplied to the first supply line.

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First Claim