Abstract: An oil supply system of an automatic transmission or an automated manual transmission in a power train has an oil pan and a pressure line for supplying elements of the transmission with pressurized oil. A pumping device pumps oil from the oil pan into the pressure line at a supply pressure P0. A hydrodynamic converter, being a starting element, forms a subsection of the pressure line. A hydrodynamic retarder is disposed in a retarder oil circuit. At least a first switching valve, a second switching valve and a heat exchanger, wherein the heat exchanger is selectively switchable, by way of the switching valves, as a subsection into the pressure line or the retarder oil circuit. A temperature sensor is provided following the pumping device in the direction of flow in order to detect the oil temperature in the pressure line.

Abstract: An oil supply system of an automatic transmission or an automated manual transmission in a power train has an oil pan and a pressure line for supplying elements of the transmission with pressurized oil. A pumping device pumps oil from the oil pan into the pressure line at a supply pressure P0. A hydrodynamic converter, being a starting element, forms a subsection of the pressure line. A hydrodynamic retarder is disposed in a retarder oil circuit. At least a first switching valve, a second switching valve and a heat exchanger, wherein the heat exchanger is selectively switchable, by way of the switching valves, as a subsection into the pressure line or the retarder oil circuit. A temperature sensor is provided following the pumping device in the direction of flow in order to detect the oil temperature in the pressure line.

Abstract: There is provided a method for setting an operating pressure of a transmission, the transmission having at least one of clutches, brakes, actuators, a hydrodynamic clutch, and a hydrodynamic converter, to which a medium conducting the operating pressure can selectively be applied, in order to vary a transmission ratio of at least one of a speed and a torque between a transmission input shaft and a transmission output shaft by opening and closing at least one of the clutches and the brakes, by actuating the actuators, and/or by a hydrodynamic power transmission using at least one of the hydrodynamic clutch and the hydrodynamic converter, wherein the operating pressure being switchable between a constant nominal value and a constant decreased value that is smaller in relation thereto, or the operating pressure being reducible in three or more steps or continuously from a nominal value to a decreased value.

Abstract: The invention relates to a method for setting the operating pressure of a transmission, in particular a motor vehicle shift transmission, the transmission having clutches, brakes, actuators, a hydrodynamic clutch, and/or a hydrodynamic converter, to which a medium that conducts the operating pressure can alternately be applied in order to vary the transmission ratio of the speed and/or the torque between a transmission input shaft and a transmission output shaft by opening and closing the clutches and/or brakes, by actuating the actuators, and/or by hydrodynamic power transmission using the hydrodynamic clutch and/or the hydrodynamic converter, the operating pressure being switchable between a constant nominal value and a constant decreased value smaller in relation thereto, or the operating pressure being reducible in three or more steps or continuously from a nominal value to a decreased value.

Abstract: The invention concerns a transmission oil circuit with an oil pump for feeding oil or another fluid from an oil sump or corresponding fluid sump; with a heat exchanger, the oil flows through, for evacuating the heat from the oil; with a work pressure valve, against which the oil pump conveys the oil, so as to bring the conveyed oil to a preset work pressure for pressure actuation, applying hydraulic pressure or conveying hydraulic pressure to switching valves and/or other transmission components and/or other units outside the transmission, which are arranged in the flow direction upstream of the work pressure valve in a row with respect thereto or in the flow direction downstream of a supply line, which branches off in the transmission oil circuit upstream of the work pressure valve.