Abstract: A pressure vessel which is provided preferably for use in bladder accumulators (27), having a multi-part vessel body (1) composed of a tubular central part (3) which, at at least one of its two ends, has a termination region (5, 7), is characterized in that a cover part (9) which at least partially forms the respective termination region (5, 7) engages at the edge over the central part (3), at least in the region of the respectively assignable end (13, 15) thereof, so as to form a fixed connection.

Abstract: A dual piston accumulator, in particular for a hydrostatic hybrid drive system for vehicles, replaces a high pressure hydro accumulator and a low pressure hydro accumulator. Inside a single accumulator housing (2) extending in the axial direction in a single piece over a high pressure part (4) and a low pressure part (6), an accumulator piston (8, 10) defines a high pressure-sided fluid chamber (16) and a low pressure-sided fluid chamber (18). Both chambers border an intermediate piece (12) separating the high pressure side (4) from the low pressure side (6). A common piston rod (14) extends through the intermediate piece for both accumulator pistons (8, 10). The wall width of the housing (2) corresponding to the high pressure part (4) is greater than the opposite reduced wall width corresponding to the low pressure part (6).

Abstract: A hydraulic accumulator, preferably a membrane accumulator, in particular for damping pulsations in fluid circuits, includes an accumulator housing (12) with at least one inlet (14) and an outlet (16) for the fluid for damping. A separating element (18), preferably in the form of a membrane, separates a gas reservoir (20) from a fluid chamber (22) within the accumulator housing (12). A hydraulic accumulator with high working capacity of high reliability which little space requirement despite high accumulation capacity for the working gas in the gas reservoir (20) can be achieved. A support device (24) within the accumulator housing (12), extends within the gas reservoir (20) and forms a possible support for the separating element (18). The gas reservoir (20) of the accumulator housing (12) is sufficiently large in dimension that the total necessary gas volume is retained within the accumulator housing (12) itself.

Abstract: A hydraulic accumulator, especially a pulsation damper, comprises a metal bellows (19) that has a terminal element (35) which can be displaced along the wall of a housing (1) at least on one bellows end (31) during expansion and compression of the bellows (19), a guiding means (47) being interposed between the terminal element and the housing. Said guiding means comprises, on at least one peripheral zone of the terminal element (35), on its outer periphery, first annular sections (51) that are radially spaced apart from the wall of the housing (1) and that are separated from each other by second annular sections (53) and radially project over the first annular sections (51).

Abstract: A guiding device for a metal bellows (3), on at least one bellows end (37) movable along the wall of a housing (10) during the expansion and contraction of the bellows (3). A guiding element is provided between the end body and the housing (10). The guiding element is formed by a plurality of separate guiding bodies (49) disposed in intervals from each other on the circumference of the end body (39).

Abstract: A pressure tank, in particular hydraulic accumulator (3, 5), has a parting element (1) separating a space (11) for a first gaseous working medium from a space for a second fluid working medium in the tank. The parting element is flexible, can move under deformation and defines a domed main parting plane extending from an annular edge (13). The parting element (1) is produced from a substance having a fluoroplastic material, preferably a substance composed entirely of fluoroplastic material.

Abstract: The invention relates to a dual piston accumulator which is provided, in particular, in a hydrostatic hybrid-drive system for vehicles to replace a high pressure hydro accumulator and a low pressure hydro accumulator, wherein, inside a single accumulator housing (2) which extends in the axial direction in a single piece over a high pressure part (4) and a low pressure part (6), an accumulator piston (8, 10) defines a high pressure-sided fluid chamber (16) and a low pressure-sided fluid chamber (18), both of which border an intermediate piece (12) separating the high pressure side (4) from the low pressure side (6) through which the common piston nod (14) extends for both accumulator pistons (8, 10). Said accumulator is characterised in that the wall width of the housing (2) corresponding to the high pressure pan (4) is greater than the opposite induced wall width which corresponds to the low pressure pan (6).

Abstract: A method produces piston-type accumulators, including an accumulator housing (10) and a separating piston, which can be displaced in a longitudinal direction inside the accumulator housing (10) and separates two working spaces located in the housing. One end face of the accumulator housing is sealed by cover part (20). The cover part (20) is fixed on one side (40) via the free longitudinal edge (32) of the accumulator housing (10). The edge is displaced towards the cover part (20), such that a functionally and positionally secure connection of a cover part is ensured within the housing of a piston-type accumulator without using standard threaded connections.

Abstract: The invention relates to an hydrostatic hybrid drive system for road vehicles, said system comprising a pump/motor unit (1) which is or can be connected to the powertrain of the vehicle, can be controlled by means of a control unit (5) in a pump or motor operation and can be connected to a high-pressure hydraulic accumulator via a first working line (7) that can be closed by means of a control valve (45) and to a low-pressure hydraulic accumulator via a second working line (9). The high-pressure hydraulic accumulator and low-pressure hydraulic accumulator are formed by a double-piston accumulator (11), in which a high-pressure side and a low-pressure side having respective accumulator pistons (15, 17) are formed in an accumulator housing (13), wherein the fluid chambers (23 and 25) of the high-pressure side and the low-pressure side are separated by a central housing part (21) through which the common piston rod for both accumulator pistons (15, 17)extends.

Abstract: A guiding device for metal bellows (19) which comprises a terminal element (35) on at least one bellows end (31), said terminal element being movable along the wall of a housing (1) during expansion and compression of the bellows (19), a guiding means (47) being interposed between the terminal element and the housing (1). The guiding device is characterized in that the guiding means comprises at least one annular element (47) which surrounds a peripheral zone of the terminal element (35), said annular element, on its outer periphery, forming first annular sections which are radially spaced apart from the wall of the housing (1) and which are separated from each other by second annular sections that radially project over the first annular sections.

Abstract: A hydraulic accumulator, especially a pulsation damper, comprises a metal bellows (19) that has a terminal element (35) which can be displaced along the wall of a housing (1) at least on one bellows end (31) during expansion and compression of the bellows (19), a guiding means (47) being interposed between the terminal element and the housing (1). Said guiding means comprises, on at least one peripheral zone of the terminal element (35), on its outer periphery, first annular sections (51) that are radially spaced apart from the wall of the housing (1) and that are separated from each other by second annular sections (53) that radially project over the first annular sections (51). The terminal element (35) is axially elongated by a peripheral sleeve part (63) which extends towards the immobile bellows end (29), the end of the sleeve part (63) resting as a stop element on a part (25) which is fixed to the housing when the bellows (19) is compressed.

Abstract: A device for recovering energy in working machines, with at least one power drive, which can be actuated to move a load mass back and forth, and with an energy storage system (16) which absorbs the energy released in the movement of the load mass in one direction and which makes it available for a subsequent movement in the other direction, is characterized in that there is an energy storage system in the form of an accumulator cylinder (16) which, mechanically coupled to the load mass, stores pneumatic pressure energy for movement in one direction, and, for movement in the other direction, acts as an auxiliary working cylinder which supports the power drive and which converts the stored pressure energy into driving force.

Abstract: The invention relates to a hydrostatic drive system having a motor-driven hydraulic pump (1) that can be connected to at least one hydraulic drive unit (7) by means of a first (19) and a second working line (21) forming a hydraulic circuit, said drive unit being connected to a gear set (1, 3), having a first hydraulic accumulator (53) for accumulating pressure energy that can be connected to one of the working lines (19, 21), and a second hydraulic accumulator (55) that can be connected to the other working line (19, 21), and having a valve device (V1, V2) by which the segment (23, 25) of each working line (19 or 21) running to the drive unit (7) can be separated in order to separate an accumulator part (33) from the part of the circuit comprising the hydraulic pump (13), said accumulator part comprising the hydraulic accumulators (53, 55) and the at least one drive unit.

Abstract: The invention relates to a hydraulic accumulator, in particular in the form of a bellows accumulator, in which the bellows (13) which serves as a movable separating element between a gas side (11) and a fluid side (21) has, at that bellows end thereof which is movable in the axial direction during expansion and contraction in the accumulator housing which defines a longitudinal axis (9), a closure body (25) which closes off the interior space (33) of the bellows (13) in a fluid-tight manner, and in which the bellows, at the other bellows end (27) thereof, is immovably fixed with respect to the accumulator housing (1), said hydraulic accumulator being characterized in that the immovable bellows end (27) is fixed to an end body (31) which is fixed with respect to the housing, which end body (31) is in the form of a disk with a region (37) which projects axially into the interior (33) of the bellows (13) from the main plane (35) of the disk, and in that at least one fluid passage (41, 43) is formed on the projec

Abstract: A hydraulic unit, in particular for lifting and lowering loads in stacking trucks, has at least one working cylinder (10). The piston/rod unit (12) of the cylinder is guided movably in a housing (22). By a hydraulic pump (25), the piston/rod unit can be extended in its one drive direction (30) and can be retracted in its other opposite drive direction (32). A control device (20) actuates the displacement movements to that effect. A storage device (38) is fed energy in one drive direction (32). The energy fed in can be called up from the storage device (38) to assist a displacement movement in an opposite drive direction (30).

Abstract: A pressure accumulator, especially a pulsation damper, includes an accumulator housing (10) and a piston element (28) disposed in it. A bellows-type separative element (30) is supported on the piston part (28) with its one end (32) and with its other end (34) on the accumulator housing (10). The separative element (30) separates two working chambers (26, 40) within the accumulator housing (10) from each other, especially a gas chamber (26) from a fluid chamber (40), in a fluid-tight, especially gas-tight manner. To one working chamber (26), in addition to a defined volumetric proportion of a working gas, is filled with a fluid. In this manner, the working gas allows for a compression to a certain degree and for a dampening and smoothening of the pulsations of the fluid medium migrating to and occurring on the fluid side of the accumulator.

Abstract: A guiding device for a metal bellows (3), which on at least one bellows end (37) comprises an end body (39) movable along the wall of a housing (10) during the expansion and contraction of the bellows (3), a guiding element being provided between said end body and the housing (10), is characterized in that the guiding element is formed by a plurality of separate guiding bodies (49) that are disposed in intervals from each other on the circumference of the end body (39).

Abstract: In a pressure tank, in particular hydraulic accumulator (3, 5), having a parting element (1), which parting element (1) separates a space (11) for a first, in particular gaseous, working medium from a space for a second working medium, in particular a fluid, in the tank, is flexible, can move under deformation and defines a domed main parting plane which extends from an annular edge (13), the parting element (1) is produced from a substance which has a fluoroplastic material, preferably a substance composed entirely of fluoroplastic material.

Abstract: Hydraulic unit, in particular for lifting and lowering loads in stacking trucks having at least one working cylinder (10), the piston/rod unit (12) of which is guided movably in a housing (22) and, by means of a hydraulic pump (25), can be extended in its one drive direction (30) and can be retracted in its other opposite drive direction (32), and having a control device (20) for actuating the displacement movements to that effect. It is distinguished by the fact that there is a storage device (38) which is fed energy in one drive direction (32), and by the fact that the energy which is fed in can be called up from the storage device (38) in order to assist a displacement movement in an opposite drive direction (30).

Abstract: The invention relates to a pressure accumulator, especially a pulsation damper, which comprises an accumulator housing (10) and a piston element (28) disposed therein. A bellows-type separative element (30) is supported on the piston part (28) with its one end (32) and with its other end (34) on the accumulator housing (10). Said separative element (30) separates two working chambers (26, 40) within the accumulator housing (10) from each other, especially a gas chamber (26) from a fluid chamber (40), in a fluid-tight, especially gas-tight manner. The one working chamber (26), in addition to a defined volumetric proportion of a working gas, is filled with a fluid. In this manner the working gas allows for a compression to a certain degree and thus for a dampening and smoothening of the pulsations of the fluid medium migrating to and occurring on the fluid side of the accumulator.