Abstract: A mobile operating table column comprising a base and a stability system for ensuring that the base rests securely on an uneven surface, wherein the stability system comprises: four retractable and extendable upright support elements arranged at four different corners of the base, as well as support surfaces and an actuator for retracting and extending each of the four upright support elements. Each upright support element is associated with a support surface and can be retracted and extended relative to the latter. Moreover, the stability system may assume at least two different operating states: i) a parked state, in which the base rests on the floor with at least three of the support surfaces and the upright support elements are retracted; and ii) a fixed stationary state, in which the base rests on the surface with at least three of the support surfaces and the support elements are extended such that they are in contact with the surface and thereby ensure that the base rests securely on the floor.

Abstract: An operating table includes a column, a hydraulic unit positioned in the column, and a patient supporting surface connected to the column. The operating table also includes a first pair of hydraulic cylinders for adjusting a portion of the supporting surface relative to a remainder of the supporting surface, and the supporting surface is hydraulically connected to the hydraulic unit only by a single supply line and a single return line extending between the supporting surface and the hydraulic unit.

Abstract: An apparatus is disclosed. The apparatus includes an operating table column head assembly, a patient support surface assembly that is movable relative to the operating table column head assembly, and an actuating cylinder configured to move the patient support surface assembly relative to the operating table column head assembly, the actuating cylinder including a piston rod. A first gear rack is attached to the operating table column head assembly and a second gear rack is attached to the patient support surface assembly. A gear assembly is disposed on the piston rod of the actuating cylinder. The gear assembly engages with the first gear rack and the second gear rack. The first gear rack and the second gear rack move in substantially opposite directions relative to the gear assembly, when the actuating cylinder is actuated.

Abstract: A hydraulic circuit for an operating table includes a hydraulic unit, a first hydraulic cylinder with a first chamber defined at least partially by a first leading active surface; and a second hydraulic cylinder with a second chamber defined at least partially by a second leading active surface; wherein: in a control operating mode of the hydraulic circuit, the first chamber is in fluid communication with only the second chamber, and in a maintenance operating mode of the hydraulic circuit, the first chamber and the second chamber are in fluid communication with the hydraulic unit.

Abstract: An operating table includes a column, a hydraulic unit positioned in the column, and a patient supporting surface connected to the column. The operating table also includes a first pair of hydraulic cylinders for adjusting a portion of the supporting surface relative to a remainder of the supporting surface, and the supporting surface is hydraulically connected to the hydraulic unit only by a single supply line and a single return line extending between the supporting surface and the hydraulic unit.

Abstract: An apparatus is disclosed. The apparatus includes an operating table column head assembly, a patient support surface assembly that is movable relative to the operating table column head assembly, and an actuating cylinder configured to move the patient support surface assembly relative to the operating table column head assembly, the actuating cylinder including a piston rod. A first gear rack is attached to the operating table column head assembly and a second gear rack is attached to the patient support surface assembly. A gear assembly is disposed on the piston rod of the actuating cylinder. The gear assembly engages with the first gear rack and the second gear rack. The first gear rack and the second gear rack move in substantially opposite directions relative to the gear assembly, when the actuating cylinder is actuated.

Abstract: A hydraulic arrangement by which a plurality of shift rails of a transmission are actuated, including one double acting cylinder per shift rail by which the respective shift rail can be moved back and forth. A first hydraulic valve is connected upstream of the plurality of shift rails and has a first output and a second output, by which a first shift pressure and a second shift pressure for actuating the shift rails can be provided. A second hydraulic valve is connected between the first hydraulic valve and two of the shift rails, and by which it is selectively possible for the first output of the first hydraulic valve to be associated with one of the double acting cylinders of the two shift rails, and the second output of the first hydraulic valve to be associated with the other double acting cylinder of the two shift rails.

Abstract: A hydraulic energy source for supplying a downstream hydraulic system with hydraulic energy. In particular, a hydraulic system for controlling and/or cooling a transmission preferably a dual clutch transmission. The hydraulic energy source enables a first partial volume flow which is produced at a comparatively high system pressure and which is used to supply an actuator of the hydraulic system and a second partial volume flow which is produced at a comparatively low cooling pressure and which is used to cool the hydraulic system, to be produced The hydraulic energy source has an electrically driveable first volume flow source which is used to produce the first partial volume flow and a second volume flow source which is used to produce the second partial volume flow. The second volume flow source is drivingly connected independently of an internal combustion engine.

Abstract: A hydraulic arrangement by which a plurality of shift rails of a transmission are actuated, including one double acting cylinder per shift rail by which the respective shift rail can be moved back and forth. A first hydraulic valve is connected upstream of the plurality of shift rails and has a first output and a second output, by which a first shift pressure and a second shift pressure for actuating the shift rails can be provided. A second hydraulic valve is connected between the first hydraulic valve and two of the shift rails, and by which it is selectively possible for the first output of the first hydraulic valve to be associated with one of the double acting cylinders of the two shift rails, and the second output of the first hydraulic valve to be associated with the other double acting cylinder of the two shift rails.

Abstract: A double-clutch transmission having at least three and preferably four, hydraulic shift cylinders, and a control device to actuate the hydraulic shift cylinders. To improve the speed of operation when selecting a gear, the shift cylinders needed for gear shifting are actuated with the aid of at least three electromagnetically shiftable directional valves.

Abstract: A device for actuating a plurality of hydraulic control cylinders having a pressure regulating valve with a first and a second pressure regulating output, a first selector valve connected downline from the pressure regulating outputs, a second selector valve connected downline from the first selector valve, having a plurality of individual pressure outputs, where the second pressure regulating output is optionally assignable through the first and second selector valves to one of the individual pressure outputs, and the particular individual pressure outputs that are not assigned to the second pressure regulating output are assignable to the first pressure regulating output.

Abstract: A hydraulic energy source for supplying a downstream hydraulic system with hydraulic energy. In particular, a hydraulic system for controlling and/or cooling a transmission preferably a dual clutch transmission. The hydraulic energy source enables a first partial volume flow which is produced at a comparatively high system pressure and which is used to supply an actuator of the hydraulic system and a second partial volume flow which is produced at a comparatively low cooling pressure and which is used to cool the hydraulic system, to be produced The hydraulic energy source has an electrically driveable first volume flow source which is used to produce the first partial volume flow and a second volume flow source which is used to produce the second partial volume flow. The second volume flow source is drivingly connected independently of an internal combustion engine.

Abstract: A hydraulic arrangement for controlling a twin-clutch transmission of a motor vehicle. The hydraulic arrangement has a hydraulic energy source for supplying the hydraulic arrangement with hydraulic energy with a hydraulic medium; a pressure accumulator for storing the hydraulic energy; and a clutch cooling device for cooling clutches of the twin-clutch transmission with the hydraulic medium. A transmission lubrication process and/or a transmission cooling process for cooling and/or lubricating a transmission of the twin-clutch transmission with the hydraulic medium is/are carried out, in addition to a prioritization process for prioritizing the supply of the pressure accumulator before the clutch cooling, and the clutch cooling before the transmission lubrication and/or transmission cooling by means of the hydraulic medium.

Abstract: A hydraulic system including a pump for feeding hydraulic fluid from an inlet side to an outlet side. A pressure accumulator is disposed at the outlet side, and between the pump and the pressure accumulator a hydraulic control valve is disposed, which has at least two valve positions. The outlet side of the pump is connected to the pressure accumulator in a second valve position, and is separated from the pressure accumulator in a first valve position. The outlet side of the pump is connected to the inlet side through the control valve in the first valve position.

Abstract: A hydraulic pressure reservoir having at least one pressure chamber formed between two opposed, movable inner boundary members. Each inner boundary members includes a spring cover and a diaphragm spring. An outer boundary member peripherally surrounds the movable inner boundary members and has a U-shaped cross section along at least a part of its periphery to axially support the diaphragm springs in a fixed axial position. The outer boundary member can be formed in several pieces that are held together by interconnections or by a surrounding outer tensioning member.

Abstract: A double clutch gearbox, which has a first volume flow valve for actuating a first clutch, which is arranged downstream, a second volume flow valve for actuating a second clutch which is arranged downstream, and a first hydraulic power source for supplying the volume flow valves and the clutches with a system pressure. In order to provide an improved double clutch gearbox, the clutches have fluid cooling which is arranged downstream of the first volume flow valve.

Abstract: A clutch control device for controlling the operation of a hydraulically operated clutch with a flow control valve. The control device includes a volume flow regulating valve that enables both volume flow regulated filling and volume flow regulated emptying of a hydraulic clutch positioning element, to provide rapid and precise operation of the clutch.

Abstract: A dual clutch transmission which has a first clutch, actuated by a first hydraulic cylinder, a second clutch, actuated by a second hydraulic cylinder, shift devices for shifting gears, which are actuated by respective hydraulically operated cylinders, and a hydraulic energy source for supplying the hydraulic cylinders and the hydraulically operated cylinders with hydraulic energy. The hydraulic energy source has a first pump, a second pump and an electric drive driving the second pump.

Abstract: An hydraulic pressure reservoir having at least one pressure chamber with a fluid connection to a hydraulic circuit. The pressure chamber is formed between a movable partition member carried in a housing and having a pressure limiting valve, and a fixed partition. The movable partition member is in the form of a diaphragm spring.

Abstract: A hydraulic arrangement for controlling a twin-clutch transmission of a motor vehicle. The hydraulic arrangement has a hydraulic energy source for supplying the hydraulic arrangement with hydraulic energy with a hydraulic medium; a pressure accumulator for storing the hydraulic energy; and a clutch cooling device for cooling clutches of the twin-clutch transmission with the hydraulic medium. A transmission lubrication process and/or a transmission cooling process for cooling and/or lubricating a transmission of the twin-clutch transmission with the hydraulic medium is/are carried out, in addition to a prioritization process for prioritizing the supply of the pressure accumulator before the clutch cooling, and the clutch cooling before the transmission lubrication and/or transmission cooling by means of the hydraulic medium.