Hydraulic system of a transmission device with a lubrication circuit

A hydraulic system in a transmission device, comprising:

• a lubrication circuit that is supplied with hydraulic fluid downstream of a cooling device, wherein at least part of the volume of flow of hydraulic fluid through the cooling device is discharged upstream of the lubrication circuit to a hydraulic fluid reservoir;
• a valve device arranged downstream of the cooling device and upstream of the lubrication circuit, the valve device transferable between a first operating state and a second operating state;
• in the first operating state of the valve device, a volume flow of hydraulic fluid supplied to the valve device is discharged to a hydraulic fluid reservoir;
• in the second operating state of the valve device, a volume flow of hydraulic fluid supplied to the valve device is supplied at least partially to a shifting element in the transmission device;
• wherein the valve device is a shifting valve device having a first shifting state wherein the volume flow of hydraulic fluid to the shifting device is discharged to the hydraulic fluid reservoir, and a second shifting state wherein the volume flow of hydraulic fluid supplied to the valve device is supplied at least partially to a shifting element in the transmission device;
• further comprising valve device upstream of the shifting valve device that adjusts the volume flow of hydraulic fluid to the shifting valve device;
• wherein operating pressure of the shifting valve device is adjustable by way of a regulating valve device that supplies the shifting valve device with the operating pressure;
• and
• wherein the regulating valve device is pilot controlled and operating pressure of the shifting valve device is adjustable by adjusting a pilot pressure at the regulating valve device.

A hydraulic system in a transmission device, comprising:

• a lubrication circuit that is supplied with hydraulic fluid downstream of a cooling device, wherein at least part of the volume of flow of hydraulic fluid through the cooling device is discharged upstream of the lubrication circuit to a hydraulic fluid reservoir;
• a valve device arranged downstream of the cooling device and upstream of the lubrication circuit, the valve device transferable between a first operating state and a second operating state;
• in the first operating state of the valve device, a volume flow of hydraulic fluid supplied to the valve device is discharged to a hydraulic fluid reservoir;
• in the second operating state of the valve device, a volume flow of hydraulic fluid supplied to the valve device is supplied at least partially to a shifting element in the transmission device;
• wherein the valve device is a shifting valve device having a first shifting state wherein the volume flow of hydraulic fluid to the shifting device is discharged to the hydraulic fluid reservoir, and a second shifting state wherein the volume flow of hydraulic fluid supplied to the valve device is supplied at least partially to a shifting element in the transmission device;
• further comprising valve device upstream of the shifting valve device that adjusts the volume flow of hydraulic fluid to the shifting valve device;
• wherein operating pressure of the shifting valve device is adjustable by way of a regulating valve device that supplies the shifting valve device with the operating pressure;
• and
• further comprising a throttle device arranged in a line connecting the regulating valve device to the shifting valve device downstream of a branch point, wherein at the branch point volume flow of hydraulic fluid through the regulating valve device is directed in part to the shifting element and in part to the shifting valve device.

A hydraulic system in a transmission device, comprising:

• a lubrication circuit that is supplied with hydraulic fluid downstream of a cooling device, wherein at least part of the volume of flow of hydraulic fluid through the cooling device is discharged upstream of the lubrication circuit to a hydraulic fluid reservoir;
• a valve device arranged downstream of the cooling device and upstream of the lubrication circuit, the valve device transferable between a first operating state and a second operating state;
• in the first operating state of the valve device, a volume flow of hydraulic fluid supplied to the valve device is discharged to a hydraulic fluid reservoir;
• in the second operating state of the valve device, a volume flow of hydraulic fluid supplied to the valve device is supplied at least partially to a shifting element in the transmission device;
• wherein the valve device is a shifting valve device having a first shifting state wherein the volume flow of hydraulic fluid to the shifting device is discharged to the hydraulic fluid reservoir, and a second shifting state wherein the volume flow of hydraulic fluid supplied to the valve device is supplied at least partially to a shifting element in the transmission device;
• further comprising valve device upstream of the shifting valve device that adjusts the volume flow of hydraulic fluid to the shifting valve device;
• wherein operating pressure of the shifting valve device is adjustable by way of a regulating valve device that supplies the shifting valve device with the operating pressure;
• and
• further comprising a throttle device arranged in a line between the regulating valve device and a pressure regulator device.