Abstract: In a method for bending a sheet-metal part (50) on a profile body (24) having a bending profile (52), the sheet-metal part (26, 28) is pressed against the profile body (24) at an initial contact point (54), wherein bending rollers (26, 28), starting from the initial contact point (54), press the sheet-metal part (50) along the bending profile (52) against the profile body (24) and adapt it plastically to the shape of the profile body (24). Furthermore, a bending device (22) for carrying out the method is specified.

Abstract: In a swash-plate type hydrostatic piston engine, a drive unit (10) and a swash plate (17) are received by a pot-shaped housing (1b). According to the invention, the pot-shaped housing (1b) is configured such that it is able to receive drive units (10a, 10b) of at least two rated quantities of a specific product series of the hydrostatic piston engine.

Abstract: The invention relates to a hydrostatic piston machine with a cylinder drum which is rotatably mounted in a housing. A plurality of cylinder bores are disposed in the cylinder drum, which bores can be connected via cylinder openings provided in the cylinder drum (6) to a first control opening (12) and a second control opening (15). The first control opening (12) is connected to a low-pressure line and the second control opening (15) to a high-pressure line. The first control opening (12) is connected via a first connection (38) and a second connection (39) to a channel (37), wherein the first connection (38) and, lying opposite, the second connection (39) are disposed at the first control opening (12).

Abstract: The invention relates to a tubular piston for a piston engine, comprising a tubular section, a collar shaped region and a ball pivot formed thereon, and an inner tube arranged in an outer tube. A cavity is at least partially formed between the outer tube and the inner tube. Said cavity is sealed from the area surrounding the hollow piston in a pressure-tight manner, by a material, especially a solder material, which is arranged in the cavity in a positively locking manner by means of heating.

Abstract: The invention relates to an axial piston machine having a first group of pistons (34.1) for delivering into a first hydraulic circuit and a second group of pistons (34.2) for delivering into a second hydraulic circuit. The pistons (34.1) of the first group and the pistons (34.2) of the second group are supported on a common slanted swash plate (37?) and the slanted swash plate (37?) can be slanted to a first swivel axis (55) in order to regulate a first delivery volume of the first group of pistons (34.1) in the first hydraulic circuit (55) and to a second swivel axis (56) in order to regulate a second delivery volume of the second group of pistons (34.2) in the second hydraulic circuit.

Abstract: The invention relates to a load-pressure-controlled fees flow regulator (1) for adjusting the feed volume of an adjustable hydraulic pump (2) which feeds in a working line (3). The load-pressure-controlled feed flow regulator (1) has an adjusting device (5) for adjusting the feed volume of the hydraulic pump (2). The adjusting device (5) is acted on with an adjusting pressure in order to adjust the feed volume of the hydraulic pump (2). The level of the adjusting pressure is generated by an adjusting pressure regulating device (17). In addition to the adjusting pressure regulating device (17), the fees flow regulator (1) has a damping device (30).

Abstract: The invention relates to a connection block for a hydrostatic piston machine which is provided for simultaneous operation in a first hydraulic circuit and a second hydraulic circuit. A first working pressure duct (60) and a second working pressure duct (61) are formed in the connection block, via which ducts respectively a first and a second working line (7, 8) of the first hydraulic circuit can be connected to respectively a first and a second kidney-shaped control port of a control plate (52) of the hydrostatic piston machine. Furthermore, a third working pressure duct (62) and a fourth working pressure duct (63) are formed in the connection block (25), via which ducts respectively a third and a fourth working line (7?, 8?) of the second hydraulic circuit can be connected to respectively a third and a fourth kidney-shaped control port (70?, 71?) of the control plate of the hydrostatic piston machine.

Abstract: The invention relates to a hydrostatic piston machine (1) having a drive shaft (2) which passes through a cylinder-drum unit. Cylindrical clearances (18, 19) are disposed in said cylinder-drum unit. Pistons (16, 17), which are disposed in a displaceable manner in said cylinder clearances (18, 19), are connected to the drive shaft (2) in a torsion-proof manner. The cylinder-drum unit is centred on a bearing (32, 32?) provided on the drive shaft (2). Said cylinder-drum unit consists of a cylinder drum (20, 21) having a number of cylindrical clearances (18, 19) constructed therein.

Abstract: A pressure limiting valve comprises a valve closing body (7) which comprises a valve closing surface (8) which together with a first valve seat (9) opposing the valve closing surface (8) forms a first seal seat and a valve closing body orifice (11), which is surrounded by a second valve seat (12) which together with a closing head (14) configured on an axially displaceable valve bolt (13) forms a second seal seat and with a spring plate (15) which is connected to the valve bolt (13) and axially displaceable therewith, and a first return spring (10) clamped between the spring plate (15) and the valve closing body (7), which pretensions the valve bolt (13) against the second valve seat (12) configured on the valve closing body (7) and a second return spring (35) which pretensions a valve unit (7, 13, 15, 10) against the first valve seat (9). In the valve bolt (13) a longitudinal bore (53) is provided extending over the entire axial length of the valve bolt (13).

Abstract: The invention concerns a method and a transmission arrangement for changing gears in a transmission with a hydrostatic transmission and a manual gearbox (4) connected downstream from it. First the output torque of a hydrostatic motor (9) is reduced. After the reduction of the output torque of the hydrostatic motor (9), an engaged gear (12, 13) of the manual gearbox (9) which is connected downstream is disengaged. An output rotational speed of the hydrostatic motor (9) corresponding to the gear (13, 12) to be engaged is determined. The gear ratio of the hydrostatic transmission is then adjusted, so that the output rotational speed of the hydrostatic motor (9) is higher than the determined corresponding output rotational speed. After this increased output rotational speed is reached, the gear (13, 12) to be engaged is engaged.

Abstract: A hydraulic motor unit including a hydraulic motor (1?) which is connected to two working lines (3,4). The swiveling angle (?) of the hydraulic motor (1?) is adjustable by an adjusting unit (7) which is provided with a regulating piston (8) having two piston surfaces (9, 10). The regulation pressure acting on a first piston surface (10) in a regulation pressure chamber (12) can be adjusted by a control valve (13). The control valve (13) adjusting the regulation pressure is movable between two final positions. The pressure of a working line (3, 4) is applied to a first measuring surface (23) of the control valve (13) adjusting the regulation pressure while a second, opposite measuring surface (25) of the control valve (13) is impinged upon by a control pressure piston (34) at a force that depends on the control pressure only once a threshold value of a pipe (28, 18?) supplying control pressure has been exceeded.

Abstract: The gear pump unit (100) comprises a pump cover (1), an internal rotor (16) mounted rotatably in a recess (9) of the pump cover (1) and formed in a rotationally fixed manner on a driven plug-in shaft (11), and an external rotor (19), which is rotatably mounted in the recess (9) of the pump cover (1) eccentrically relative to the axis of rotation (A) of the internal rotor (16). The external rotor (19) is in mesh with the internal rotor (16) only in a first angle-of-rotation range (?). In a second angle-of-rotation range (?) lying opposite the first angle-of-rotation range (?), the internal rotor (16) is in contact with an inner surface (25) of a web (23), which is disposed in the recess (9). The outer surface (26) is in contact with the external rotor (19). After closing of the recess (9) by a cover plate (27) fastened to the pump cover (1), an admission pressure chamber (21) and a low-pressure chamber (22) are therefore formed in the recess (9).

Abstract: Disclosed is a check valve (5) that is screwed into a threaded bore (1) of a housing (2) of a hydraulic subassembly between a first pressure side (26) and a second pressure side (27) by means of an external thread (11) which is disposed in a first cylinder section (8) of a cylindrical valve housing (6) of the check valve (5). A passage duct (39) which allows a hydraulic fluid to flow between the sidewall of the threaded bore (1) and a first removed portion (16) of the surface area (10) of the cylindrical valve housing (6) is embodied in at least one angular segment (a1, a2, and a3) of the valve housing (6).

Abstract: The invention relates to a hydraulic steering system (1) comprising a hydraulic steering unit (2) and an auxiliary device (3). Said steering unit (2) feeds a hydraulic medium to a steering cylinder (5) according to the movement of a steering wheel (4). The auxiliary device (3) comprises a valve unit (6) and also feeds a hydraulic medium to the steering cylinder (5) according to the movement of the steering wheel (4), in order to assist the steering movement. The hydraulic medium ejected or discharged from the steering cylinder (5) as a result of the hydraulic medium fed thereinto flows back into a tank (10) or to a pump (8, 9) by means of the steering unit (2).

Abstract: An axial piston machine (1) having a rotatably mounted cylinder drum (5) which in turn has a center recess (38) and a plurality of cylinder bores (6) that extend substantially axially relative to the center bore (38) and in which pistons (7) are movably guided and are supported on a pivoting plate (11) via sliding shoes (8). The sliding shoes (8) are guided in recesses (23) of a withdrawal plate (22) in whose contact inner bore (25) a withdrawal body (16) is guided with an outer surface that corresponds to the inner bore (25) of the withdrawal plate (22). The withdrawal body (16) is subject to an axially directed pretension force which is exerted by a compression spring (26) via the pressure pins (28). Every pressure pin (28), on its base side (40), is provided with an enlarged portion (43) radially in relation to its longitudinal axis (34).

Abstract: The invention relates to a reversible axial piston machine (1) consisting of a cylinder drum (5) which rotates about a rotational axis (7) and in which pistons can be displaced in cylinders (6), said pistons being supported against an inclined surface (8). The angle of adjustment (?1, ?2) of the inclined surface (8) can be adjusted in both pivoting directions by means of a control piston (24) pertaining to the adjusting device (12), said control piston extending essentially parallel to the direction of the rotational axis (7) of the cylinder drum (5). The zero position of the adjustment of the inclined surface (8) can be adjusted without play by means of a zero position adjusting device (32).

Abstract: The invention relates to an axial piston machine (1) comprising a housing (2) in which a drive disk (7) and a cylinder block (12) axially disposed next to it are received so as to be rotatable relative to each other about longitudinal center axes (11, 13). These axes run obliquely at an angle (W1) relative to each other in an oblique axis plane (E). A cam disk (18) is disposed on the front of the cylinder block (12) facing away from the drive disk (17) and is supported on the housing (2) by means of a positioning device (19) with positively engaging positioning elements (19a, 19b). A guide element (21) having a guide center axis (22) running coaxially to the longitudinal center axis (13) of the cylinder block (12) is disposed on the side facing the cylinder block (12).

Abstract: The invention relates to a regulatory device for a pump (2), whose delivery volume can be adjusted, said device comprising a control valve unit (3) for regulating a control pressure that operates in a control pressure chamber (21) of an actuator (4, 5). The control valve unit (3) comprises a threshold value control valve (22) and a delivery flow control valve (23). The threshold value control valve (22) is subjected to a pressure from a working line (7) on the delivery side and the delivery flow control valve (23) can be subjected to a consumer input pressure taken from a consumer supply line (8), at a comparison pressure connection (29). In addition, the delivery flow control valve (23) is subjected to a control pressure that counteracts the consumer input pressure, at a regulatory pressure measurement connection (27).

Abstract: The invention relates to an axial piston machine having a swash plate (12) and a control piston (18) which contacts the swash plate (12) by way of a slide block (31) which is partially received by the swash plate (12) or the control piston (18). The slide block (31) can be inclined at least in a direction relative to the swash plate (12) or the control piston (18) and can be inserted through an opening into a cutout (80) constructed in the swash plate (12) or the control piston (18), the slide block (31) being fixed in the cutout (80) by fixing regions (83) constructed in the cutout (80). Provided in the swash plate (12) or the control piston (18), there is a resilient element (86, 91) which acts on the slide block (31) with a force directed towards the regions (83) fixing the slide block (31).

Abstract: The invention relates to control of a hydrostatic gearbox, comprising a hydraulic pump (2), provided for pumping in a first pump-side main line (5a) or a second pump-side main line (6a). The hydrostatic gearbox further comprises a hydraulic motor (3), connected to a first motor-side main line (5b) and a second motor-side main line (6b). The first pump-side main line (5a) and the second pump-side main line (6a) may be connected to the first motor-side main line (5b) or the second motor-side main line (6b) by means of a brake valve unit (19). The first motor-side main line (5b) or the second motor-side main line (6b), arranged downstream of the hydraulic motor (3), may be connected to a tank volume (12) in a throttled manner, depending on the pressure therein.