Abstract: The invention relates to a total power regulation device for two pumps (2, 42), each of which is connected to a working conduit (5, 45). The delivery volume of the pumps (2, 42) can be set separately by a respective adjusting device (6, 46), whereby a control pressure that is active in each adjusting device (6, 46) can be set by a total power regulation valve (18, 58). The latter (18, 58) has a measuring surface (24, 64) of the total power regulation valve (18, 58) of one pump (2, 42) can be directly exposed to the working pressure of the other pump (42, 2).

Abstract: A hydrostatic drive system comprising at least one hydropump (100) and at least two hydromotors (104,109). The hydropump (100) divides its total hydraulic fluid flow into at least two partial hydraulic fluid flows which are respectively pumped in the form of a partial pump train (101,102) in a common cylinder drum (23) of the hydropump (100). The first connection (103) of a first hydromotor (104), which drives a first drive train (105), is connected to the first connection (38) of the first partial pump train (101) of the hydropump (100) and the second connection (107) thereof is connected to the second connection (38?) of the first pump train (101) of the hydropump (100).

Abstract: The invention relates to a swivel slide bearing comprising an inner first bearing part (31) with an outer first bearing surface (31a) and comprising an outer second bearing part (32) with an inner second bearing surface (32a). The outer bearing part (32) surrounds the inner bearing part (31), and the outer periphery of the outer bearing part (32) is provided in the form of a ring having a spherical segment-shaped third bearing surface (32b), via which it is mounted, whereby being able to move in a manner similar to a ball but in a limited manner, inside a third bearing part (33) having a spherical segment-shaped inner fourth bearing surface (33a) that encircles the third bearing surface (32b). In order to ensure an easy mounting, at least one insertion slot (36) is provided on one side of the third bearing part (33), and the second bearing part (32) until it reaches a position in which the center of curvatures (M) of the third and fourth bearing surface (32b, 33a) overlap.

Abstract: The invention relates to a rotation-slide bearing (25c) which comprises an inner first bearing element (31) with an outer peripheral surface (31a) and an outer second bearing element (32) with an inner peripheral surface (32a). The outer bearing element (32) encloses the inner bearing element (31). At least one first oil groove (38) that extends in an approximately axial relation is provided in the outer peripheral surface (31a) of the inner first bearing element (31) and/or in the inner peripheral surface (32a) of the outer second bearing element (32). In order to improve a rotation-slide bearing of the aforementioned kind in such a way that it can absorb radial and axial forces and has good slide properties, a support shoulder (42a, 42b) with a slide surface (42c) is associated with one of the two bearing elements (31) on one or both sides and axially supports the bearing element (32) with its lateral surface (32c) facing it.

Abstract: A hydrostatic power train includes a hydraulic pump, which is connected, via a first main pipe and a second main pipe, to a first hydromotor unit driving a front axle and to a second hydromotor unit driving a rear axle. The first and second hydromotor units can be adjusted in terms of their displacement via a first and second variation device. A direction of travel is defined as forward movement (F) or reverse movement (R) by a position of an operating lever. The first and the second variation devices are controlled by a control valve which takes up a first control position upon a forward movement (F) determined by the position of the operating ever and which takes up a second control position upon reverse movement (R) determined by the position of the operating lever and which takes up a second control position upon reverse movement (R) determined by the operating lever.

Abstract: The invention relates to a hydrostatic vehicle drive system (1) comprising a first and a second hydraulic pump (2, 3), and a first and a second hydraulic motor (7, 12). Said hydraulic pumps (2, 3) and said hydraulic motors (7, 12) are coupled in such a way in a differential lock operation that a first connection (14) of the first hydraulic pump (2) is connected to a first connection (8) of the first hydraulic motor (7); a second connection (6) of the first hydraulic motor (7) is connected to a first connection (10) of the (10) of the second hydraulic pump (3); a second connection (9) of the second hydraulic pump (3) is connected to a first connection (13) of the second hydraulic motor (12); and a second connection (11) of the second hydraulic motor (12) is connected to a second connection (5) of the first hydraulic pump (2). The absorption volume of the first hydraulic motor (7) and the second hydraulic motor (12) can be respectively adjusted by means of an adjusting device (20, 21).

Abstract: The invention relates to a regulating device for hydrostatic piston machines consisting of an actuating piston (2) which can be removed between two end positions which can be impinged upon by actuating pressure exerted thereon in an opposite direction. An actuating pressure regulating valve (5) is used to regulate the actuating pressure. The actuating regulating valve (5), which is used to regulate the actuating pressure, comprises a regulating piston which can be shifted from a neutral position and which can be impinged upon with a regulating force which is dependent on the position of the actuating piston (2). The regulating force is directed counter to a control force acting upon the regulating piston (6) and the regulating force is zero when the regulating device (1) is in a rest position. When the regulating device (1) is in a rest position, the regulating piston (6) is in a neutral position and the actuating piston (2) is a specific end position.

Abstract: The invention relates to a hydrostatic drive comprising at least one hydraulic pump (1) and a first and a second hydraulic motor (6, 25), which are respectively connected to said hydraulic pump (1) by means of two service lines (4, 41, 5, 5?) and whose absorption volume can be regulated by means of a regulator (40, 41). One respective hydraulic motor (6, 25) for a drive train is provided per respective right or left vehicle side. The regulators (40, 41) are actuated by a respective regulator piston (7, 26). The regulator pistons (7, 26) of both hydraulic motors (6, 25) can be subjected to a force by means of a common high pressure, which equals the highest pressure that prevails in the service lines (4, 41, 5, 5?) of both hydraulic motors (6, 25). Each force is opposed to a respective counter-force, which is generated by a control pressure in a control pressure chamber (11, 11?).

Abstract: The invention relates to an electromagnet for actuating a valve. To this end, the electromagnet (28) comprises an armature (58), which can be axially displaced in an armature space (57, 77) and whose axial motion displaces a tappet (29) to the valve. The electromagnet is provided with reflux channel (71.1), which is connected to the armature space (57, 77) and via which the armature space (57, 77) is connected to a tank volume (25) in order to lead away a pressure medium leakage flow that is flowing out of the valve and into the armature space (57, 77).

Abstract: A hydrostatic machine with a cylinder block (6), within which sleeve holes (28b) are arranged, in which sleeves (28) sit, surrounding piston bores (28a) in which pistons (29) are mounted, such as to be displaced back and forth and the pistons (29) extend into the cylinder block (5) such as to define cylinders (26) with the front ends thereof. According to the invention, the risk of piston seizure can be reduced, whereby the sleeves (28) comprise an axially-defined recess (41) in the outer surface thereof, in the region facing away from the cylinder and the region with the greatest piston radial force, pressing the pistons (29) against the wall of the piston bore.

Abstract: The invention relates to a valve block (1) for a control device comprising a valve (9) whose valve piston (14) is subjected to the action of a control pressure when in its open position and to the action of a return spring (15) when in its closed position. The closing force of the return spring (15) can be decreased or increased by an actuator, which can be displaced toward a position that increases the closing force and one that decreases the closing force. In order to simplify the displacement or adjustment and to improve reliability, the displacing movement of the actuator (16a) in the direction of movement that increases the closing force of the return spring (15) is limited by a stop element (112) in a position in which the closing force of the return spring (15) reaches its limited maximum value.

Abstract: The invention relates to a piston engine comprising a rotatably mounted cylindrical drum (2) provided with a plurality of cylindrical boreholes distributed over the circumference thereof and containing displaceable pistons. Said cylindrical boreholes (3,4) comprise cylindrical openings (35.1, 35.2, . . . 35.9) on one side, which are temporarily connected to one of two control nodules (9, 10) according to the angle of rotation of the cylindrical drum (2), said control nodes being respectively connected to a working line (27, 28). A reversing region (30, 31) is respectively embodied between the control nodules (9, 10), a first end (32) of a pressure compensation line (33) ending in one of the reversing regions (30, 31).

Abstract: The invention concerns a control for a hydrostatic power train (1) comprising a hydraulic pump (2) which is connected, via a first main pipe and a second main pipe (7, 8), to a first hydromotor unit (5, 5?) driving a front axle and to a second hydromotor unit (6, 6?) driving a rear axle. The first and second hydromotor units (5, 5?, 6, 6?) can be adjusted in terms of their displacement via a first and a second variation device (30, 31, 30?, 31?) respectively. A direction of travel is defined as forward movement (F) or reverse movement (R) by a position of an operating lever (37). The first and the second variation devices (30, 31, 30?, 31?) are controlled by a control valve (32, 32?) which takes up a first control position upon a forward movement (F) determined by the position of the operating lever (37) and which takes up a second control position upon reverse movement (R) determined by the operating lever (37).

Abstract: The invention relates to a regulator device (1) for a hydraulic pump which pumps into at least one working pipe (13), and to a valve unit for said pump. The pumping volume of the hydraulic pump (1) is regulated with the aid of a regulator device (15, 19) exposed to a regulating pressure which is regulated by an adjusting valve (26) in conformity to a first and a second pressure. The first pressure passes through a first pressure pipe (38) and acts on a first measuring surface, the second pressure passes through a second pressure pipe (39) and acts on a second pressure surface opposite to the first surface of the adjusting valve (26), the first pressure being higher than the second pressure. Said invention is characterized in that a pressure chamber (45) is arranged between the first and second measuring surfaces, thereby forming a discharge channel towards the second pressure pipe (39).

Abstract: The invention relates to a hydraulic system (1) comprising a main pump (12) and a precompression pump (5), whereby the outlet (8) of the precompression pump (5) is connected by a connecting line (9) to the inlet (11) of the main pump (12). The outlet (16) of the main pump (12) can be connected by a working line (17) to a consumer (A, B). The volume flow at the inlet (11) of the main pump (12) is changeable. The aim of the invention is to achieve greater efficiency. The precompression pump (5) comprises an adjusting device (6) for adjusting the flow rate.

Abstract: The invention relates to a device for controlling the position for work devices (41) of mobile machines (40). The inventive device comprises a measuring device (1,2) for measuring an angle (?) which is formed between a level (42) that is determined by the position of the work device (41) and the direction of the gravitational force (g). The inventive device also comprises an angle transmitter (5) for predetermining an angle (??) which is formed between a level (42) that is determined by the position of the work device (41) and the direction of the gravitational force (g). The inventive device further comprises a controller (3, 4, 6–16) for controlling the angle (?) between the level (42) of the work device (41) and the direction of the gravitational force (g) in such a way that the measured angle (?) matches the predetermined angle (??).