Patent ID: 8353805
Filing Date: 2013-01-15
Classification: F15B,F16H,Y10T

Abstract:
1. A hydraulic system for a hydraulically actuated automatic transmission, said hydraulic system comprising: a primary pump driven by a primary drive system for supplying pressure in a supply line connected to a transmission ratio adjusting valve, wherein the supply line is connected through a pilot valve to a control line in which a control valve is situated, and wherein a pressure in the control line is adjustable and determines a setting of the transmission ratio adjusting valve; and an auxiliary pump that is driven by an auxiliary drive system that is separate from the primary drive system of the primary pump, wherein the auxiliary pump includes an outlet line connected to the control line through a first valve that opens in the direction of the control line, and includes a connecting line extending from the auxiliary pump outlet line and connected to the supply line through a second valve that opens in the direction of the supply line.