Abstract: In a machine press with a lower and an upper tool support, a closed hydraulic drive system acts upon the upper tool support. This system has at least one hydraulic drive unit, which includes at least one hydraulic cylinder-piston unit and at least one hydraulic assembly acting upon this unit and supplied from a storage reservoir. A base pressure above environmental pressure constantly prevails in the storage reservoir. The storage reservoir is designed as a cylinder store with a hydraulic chamber defined by a cylinder and a piston unit displaceably guided therein. The piston unit is acted upon on its side functionally opposite the hydraulic chamber by a hydraulic fluid chamber which for its part is connected to a high-pressure gas store. The active surface of the hydraulic fluid chamber on the piston unit is small compared to the active surface of the hydraulic chamber on the piston unit.

Abstract: In a machine press having a lower and an upper tool carrier, a hydraulic drive acting on the upper tool carrier comprises at least one closed hydraulic drive system that can be switched between rapid motion and press motion, the drive system having at least one hydraulic cylinder piston unit. The hydraulic liquid of the at least one hydraulic drive system is stored in a pressure accumulator fanning the storage container, supplying the entire associated hydraulic drive system. permanently with at least a base pressure above the ambient pressure. There is no hydraulic connection whatsoever between the working chamber on the piston rod side and the working chamber on the piston side of at least one hydraulic cylinder piston unit. The upper tool carrier is pre-stressed into its upper position by a spring unit.

Abstract: In a machine press with a lower and an upper tool support, a closed hydraulic drive system acts upon the upper tool support. This system has at least one hydraulic drive unit, which comprises at least one hydraulic cylinder-piston unit and at least one hydraulic assembly acting upon this unit and supplied from a storage reservoir. A base pressure above environmental pressure constantly prevails in the storage reservoir. The storage reservoir is designed as a cylinder store with a hydraulic chamber defined by a cylinder and a piston unit displaceably guided therein. The piston unit is acted upon on its side functionally opposite the hydraulic chamber by a hydraulic fluid chamber which for its part is connected to a high-pressure gas store. The active surface of the hydraulic fluid chamber on the piston unit is small compared to the active surface of the hydraulic chamber on the piston unit.

Abstract: In a machine press having a lower and an upper tool carrier, a hydraulic drive acting on the upper tool carrier comprises at least one closed hydraulic drive system that can be switched between rapid motion and press motion, the drive system having at least one hydraulic cylinder piston unit. The hydraulic liquid of the at least one hydraulic drive system is stored in a pressure accumulator fanning the storage container, supplying the entire associated hydraulic drive system permanently with at least a base pressure above the ambient pressure. There is no hydraulic connection whatsoever between the working chamber on the piston rod side and the working chamber on the piston side of at least one hydraulic cylinder piston unit. The upper tool carrier is pre-stressed into the upper final position thereof by means of a spring unit.

Abstract: An electrohydraulic booster comprises an electromechanical transducer and a hydromechanical power stage which is connected to a pressurized medium supply and encompasses a cylinder and a piston that can be moved therein along the working axis. The electromechanical transducer acts on a spool valve which is associated with the hydromechanical power stage, is disposed at least in part inside the piston, is guided within a guiding bore in such a way as to be movable along the working axis, and has two first leading edges that cooperate with corresponding second leading edges located on the guiding bore in order to form a hydraulic sequential control. The guiding bore consists of two parts, i.e. a cylinder-mounted first section and a second section which can be moved along the working axis and comprises the second leading edges.

Abstract: An electrohydraulic booster comprises an electromechanical transducer and a hydromechanical power stage which is connected to a pressurized medium supply and encompasses a cylinder and a piston that can be moved therein along the working axis. The electromechanical transducer acts on a spool valve which is associated with the hydromechanical power stage, is disposed at least in part inside the piston, is guided within a guiding bore in such a way as to be movable along the working axis, and has two first leading edges that cooperate with corresponding second leading edges located on the guiding bore in order to form a hydraulic sequential control. The guiding bore consists of two parts, i.e. a cylinder-mounted first section and a second section which can be moved along the working axis and comprises the second leading edges.

Abstract: A hydraulic pressure supply unit has two exits that are alternately pressurized, a reversible pumping unit including at least two pumps, reversible electric motor that drives all pumps jointly, if necessary with mutually de-locking check valves before the exits, and a supply for hydraulic medium. One pump is a low-pressure pump and one pump is a high-pressure pump, and the pressurized exits of both pumps are placed against the same exit of the pressure supply unit. Both exits of the high-pressure pump can be separated from the low-pressure pump via check valves, and each pump is connected to the supply for hydraulic medium via its own shuttle valve.

Abstract: A fluid control valve that includes an electromagnetic actuator in the form of a pot-shaped magnet (7) as well as an armature plate (6) controllable by the actuator, said armature plate including a closing member (5) cooperating with a valve seat (17, 18). The armature plate (6) is compensated in pressure through a connecting passage (19) within the closing member (5) whereby the pressurized coil chamber (20) of the actuator is pressure sealed to the outside with its cover 13 which is made in one piece with the magnet housing (8) to be able to employ the valve also in the high-pressure range.

Abstract: A hydraulic pressure supply unit has two exits (6, 7) that are alternately pressurized, a reversible pumping unit comprising at least two pumps (9, 10) as well as a reversible electric motor (11) that drives all pumps jointly, if necessary with mutually de-locking check valves (8) before the exits. Furthermore envisioned is a supply for hydraulic medium. One pump is configured as a low-pressure pump (10) and one pump is configured as a high-pressure pump (9), and whereby the pressurized exits of both pumps are placed against the same exit (6, 7) of the pressure supply unit.

Abstract: A hydraulic assembly including a reservoir, a pump arrangement, hydraulic control elements, and an electric motor for the pump arrangement whose components are coaxially arranged along a straight axis, possibly overlapping one another partially, is constructed having smaller dimensions and with simpler construction. The pump arrangement is therefore an axial piston pump (2, 2a, 5, 6) whose cylinder block (2) is oriented coaxially to the other components and the cylinder block (2) is provided with several pump elements (6).

Abstract: In a control arrangement for a working cylinder (1), which may be actuated by a pressure medium, there are provided two separate adjustable regulating valves (4, 5) for both sides of the cylinders, each connected with a pressure medium outlet (t) on one side and with the working cylinder (1) on the other side. The adjustment elements (4′, 5′) of the two regulating valves (4, 5) are housed in a common valve housing (31) for simplification of production, connection, assembly and maintenance; whereby the valve housing is provided with pressure medium connections for both cylinder sides that are to be controlled and with the corresponding conduits.

Abstract: A thermostatic valve arranged in the coolant circuit of an internal-combustion engine, has a main valve which is acted upon by cold coolant flow on the one side, and by hot coolant flow on the other side. The valve is actuated as a function of the coolant temperature by way of an expansion material element equipped with an electric heating device. To minimize the coldside influence onto the expansion material element, a capsule which stores the expansion material, has an end which limits the expansion material lower at the level of the closed main valve or on the mixing chamber side. At this end, a ring-shaped or sleeve-shaped heating element is arranged coaxially adjacent the control pin, or, individual heating elements are distributed along the circumference of the control pin in an adjacent manner.

Abstract: A control valve having a sliding valve member body movable into valve closing position against a valve seat in an outflow conduit. The body has a conical outer end for controlling the flow through the valve and a plurality of fins extending radially from the outer end into engagement with the outflow conduit to guide the body.

Abstract: A thermostatic working element has a housing in which an electric resistance heating element is arranged whose electric connecting wires are sealingly guided to the outside. The resistance heating element contains a carrier body on which a resistance layer is mounted to which the connecting wires are soldered. A base is molded to the carrier body and is sealingly arranged in the housing.

Abstract: For a thermostatic valve in the coolant circulation system of an internal-combustion engine having an expansion material element penetrating the main valve for the cold-side stationary support and the hot-side driving connection with the valve disk of the main valve, it is provided for increasing the response characteristic of the thermostatic valve to act upon the expansion material element in the cold-side end section in addition by a hot coolant and/or to provide a metal film resistor as an electric heating device placed in the expansion material.

Abstract: In the case of a thermostatic valve for a cooling system of an internal-combustion engine comprising a thermostatic working element, it is provided that the housing of the working element is held in a stationary manner, in that the working piston is provided with the main valve disk which surrounds the housing of the working element in a pot-type manner and is provided with openings in the area of its side walls, and with the short-circuit valve disk, and in that on the side of the main valve disk facing away from the working piston, the housing of the working element is situated to be at least partially free in the coolant flowing in from the radiator.

Abstract: An electric switchgear having at least one switching element that is a semiconductor with a temperature-dependent resistance, which includes a housing joined together from a metal cap and a closing element made of plastic. Contact tabs of the switching element are inserted into recesses of the closing element, and the metal cap and the closing element are connected with one another by a joining element made of plastic which is cast on on the outside and which surrounds the edge of the metal cap and surrounds the closing element at least partially.

Abstract: An electrically heatable thermostatic valve for a coolant circulating system of an internal-combustion engine in which the housing of a thermostatic working element is arranged in a stationary manner and is provided with feed lines for a heating element. The valve elements of a main valve and of a bypass valve are arranged on the working piston of the working element, the valve element of the main valve being designed such that the housing of the thermostatic working element is situated in the cold coolant flow when the main valve is closed.

Abstract: A thermostatic valve device for a coolant circulating system of an internal-combustion engine having a thermostatic working element which has a housing containing an expansion material and a working piston which is movable out of the housing in a moving-out direction. A valve disk and a valve seat forms a valve. The valve disk is connected to the housing. A restoring spring is coupled to the housing. An abutment supports the working piston such that, when the working piston moves out, the housing moves against the action of the restoring spring to lift the valve disk off the valve seat. The abutment is a thrust bearing. An idle path is between the abutment and the working piston. The idle path is bridged by a first part of the moving-out movement. A bypass connection bypasses the valve. A closing member is mounted on the working piston and closes and opens the bypass connection.

Abstract: In the case of a thermostatic valve for controlling the temperature of the coolant, particularly of a motor vehicle engine, it is provided that the working piston of the thermostatic valve is supported on a piston of a thermostatic working element which is aligned coaxially with respect to the working piston and serves as the supporting body. A restoring device is provided which is supported against the working piston and against the piston of the thermostatic working element.