Abstract: A hydraulic directional control valve with a regulating balance comprising a plunger which can be displaced in a housing (13) under the action of a differential pressure (&Dgr;p) between the intake pressure (P) and the highest load pressure (LS), and which is designed to open, in proportion to this differential (&Dgr;p), a lateral orifice of the housing linked to a working orifice (A, B) of the directional control valve; the wall of the housing and/or the plunger is provided with a calibrated passage linking the intake of fluid at pressure (P) and the lateral orifice when the plunger is pushed back into an end position by the pressure (LS) exceeding the intake pressure (P); consequently, in spite of the excess value of the pressure (LS) intended to inhibit operation of the directional control valve, hydraulic fluid is delivered to the lateral orifice at a low rate and allows the hydraulic receiver controlled by the hydraulic directional control valve to be displaced at a low rate.

Abstract: An hydraulic control arrangement which is chiefly used for a mobile working machine, especially for a wheel loader, and has at least one hydraulic cylinder with the aid of which a working tool can be moved, a directional control valve for controlling the pressure-fluid channels between the hydraulic cylinder, a pressure-fluid source and a tank, a hydraulic accumulator which can be connected to the pressure-fluid source via a filling line, and a control valve with the aid of which a connection between the hydraulic accumulator and the hydraulic cylinder can be controlled to open and close. The aim of such a hydraulic control arrangement is to avoid undesired movements of the hydraulic cylinder. This is achieved wherein the fact that the hydraulic accumulator can be filled up only when the directional control valve is actuated.

Abstract: A device (1) for providing a working means (2) with a linear movement during simultaneous energy and/or signal supply over a supply conduit or conduit(s) (10,18), includes a linear motor (3,4), an elongated rod means (16) onto which the working means (2) is arranged. The invention is distinguished by the linear motor being of a kind including a movement transferring means extending radially sideways from the motor, and being connected to the rod means, that the rod means (16) comprises a longitudinal channel for the reception of said supply conduit, and that a linear guide (8) for the rod means (16) is fixedly attached to the linear motor.

Abstract: A hydraulic control arrangement which has a directional control valve, a hydraulic pump and a two-way cartridge valve constructed as a seat valve. The directional control valve is connected to an inlet line and to a discharge line leading to a tank. Leading off from it is a load line leading to a hydraulic load. The hydraulic pump draws pressure medium from a tank and discharges it into the inlet line. The two-way cartridge valve is arranged in the inlet line and, in a closed position, isolates a second inlet line section leading off from the latter to the directional control valve from a first inlet line section running between the two-way valve and the hydraulic pump.

Abstract: A HEUI system uses a fixed displacement, axial displacement pump to provide a generally constant pump flow of high pressure hydraulic fluid over the operating speed range of the pump to minimize parasitic power drains on the engine. The axial piston pump includes a orificing suction slot to vary the pump displacement over the operating speed of the pump. A throttling valve at the pump inlet may be provided to starve inlet fluid feed if reduced flow to the injectors is additionally required.

Abstract: In a check valve assembly and a valve assembly employing such a check valve assembly, a topping piston may be taken into contact with a main poppet to raise the main poppet from its seat. The main poppet is designed without significant area difference from the valve seat and the topping piston is actuated through a pilot valve, so that the process of raising the main poppet from the valve seat is controllable.

Abstract: An axial piston pump has a rotatable input shaft integral with a rotatable swash plate. A non-rotatable cylinder contains a plurality of axially movable pistons having spherical ends extending through the cylinder journaled in slipper assemblies that are in contact with the swash plate. A retainer plate in contact with the slipper assemblies is spring biased to urge the slippers against the swash plate to maintain the swash plate in fixed axial position. The input shaft is journaled only by a sleeve bearing while an annular thrust bearing plate between pump housing and a swash plate axial end allows for swash plate rotation within the pump housing. The swash plate has a cam shaped circumferential edge surface. An auxiliary pump having a prime mover in contact with the cam shaped edge of the swash plate is mounted between the axial ends of the piston pump.

Abstract: An invention relates to an electrically controlled braking system which is intended for use on a wheeled vehicle and has input means which can be actuated by a driver of the vehicle in accordance with the desired braking effect, two electronic control units, which operate independently of each other and each of which can be supplied with an electrical signal corresponding to the extent of actuation of the input means, which can be recorded by a sensor, a brake cylinder assigned to a wheel and a braking pressure modulator valve which is fluid-connected to the brake cylinder and has a first electric actuating element, which can be activated by a first of the two control units. To make the braking system very safe, the braking pressure modulator valve has a second electric actuating element which acts in the same direction when activated, as the first electric actuating element.

Abstract: A support for a car body on a chassis, in particular on a truck of a rail vehicle. A support comprises a fluid-actuated piston-cylinder unit arranged between car body and chassis, and a rocker support arranged also between car body and chassis which comprises a first support part and a second support part which is arranged between the first support part and a part of the car. Each support part has a rolling surface via which it rests on another rolling surface, in which connection at least one rolling surface of the two rolling surfaces contacting each other is cylindrical and the contact between a pair of rolling surfaces is linear. The support part takes up little space. The distance between the car body and the chassis can be very small.

Abstract: A simply-designed, multi-purpose transport module with which heavy loads can be moved over the ground has the following features: a frame, on which the load is laid, is positioned on the floor. A support is positioned on the floor. The ground loading pressure of the frame, on an increase of the ground pressure loading of the support, and the ground pressure loading of the support, on an increase of the ground pressure loading of the frame, can be reduced to below the unloaded weight through an actuator of the frame or of the support. The frame and the support have a first pair of inclined paths through which the frame can be supported on the support and the frame is displaceable horizontally with respect to the support on achieving a sufficient reduction of its ground pressure loading.

Abstract: A directional control valve has an axially displaceable control piston inside a valve housing and a travel sensor arranged on the valve housing to detect the position of the control piston. The sensor includes a travel sensor tube which is pressure tight and sealed on one end and has a directional transmitter rod extending into the other end. The directional transmitter rod is secured to the control piston and extends through the area connecting the inside of the valve housing to the travel sensor tube. A seal exposes a dampening gap placed in the connecting area forming a throttle point enabling oil to flow into the travel sensor tube.

Abstract: A valve assembly for actuation of a user and a method for actuation of the valve assembly, wherein a supply throttle device and a drain throttle device may be actuated independent of each other, is disclosed. In the case of single-action users, the drain throttle device is actuated such that the open cross-section of the drain throttle is maximum upon attaining the desired volumetric flow of hydraulic oil, so that the energy losses in the drain conduit are reduced to minimum.

Abstract: A valve assembly for pressure adapted and volumetric flow adapted supply of at least one user may be supplied with hydraulic fluid or connected to a tank via two work ports of a continuously adjustable directional control valve. To the two work ports of the valve assembly a common pressure compensator is associated, the piston of which is guided in axial translation in an axial bore of the directional control valve spool, so that one of the two work ports may optionally be connected to the pump port upon suitable actuation of the directional control valve. At both end surfaces of the directional control valve spool and at the spring side of the pressure compensator piston, there acts a respective control pressure which, for example, corresponds to the highest system load pressure, the individual load pressure, or a pressure derived therefrom.

Abstract: A valve manifold device for mounting pressure fluid valves (2) on a surface comprising a valve interface (A—A) and including channels (7-7′,8) for supply and possibly return fluid, wherein channels are arranged for leading fluid to and from the valve interface and thereby the different valves, is distinguished in: that the manifold device (4) comprises a manifold interface (B—B) on a side separate from the valve interface (A—A), that each connecting channel for supply fluid includes a first portion (10,10′) between a channel (7) and the manifold interface and a second portion between the manifold interface (B—B) and the valve interface (A—A), and that a selectable modular body (5,5′,5″,30) is provided for connecting (12,32) said portions or to block (14,14′) the first portion and lead on the second portion, or to block both portions.

Abstract: An ejector unit (1) is mounted on a conventional valve manifold (10) with a manifold pressurised air supply connected to an ejector (4) through channels (15, 16) and a first pilot valve (3). A suction channel (20) and a return air channel (22) are connected through manifold (10) to outlet ports from the ejector (4) suction chamber (17) and outlet nozzle (18′) respectively. The ejector unit (1) is mounted through face (8) onto manifold (10) using the same hole pattern as for valves connected to the manifold.

Abstract: The invention relates to distributing valve for load-independent control of a hydraulic consumer with regard to direction and speed. Similar distributing valves known per se have a control valve (30) which can be axially displaced in a slide bore hole (11) of a valve housing (10). In a neutral position, said control valve (30) blocks off two consumer chambers (13, 15) from a feed chamber (14) and selectably connects one of the two consumer chambers (13, 15) to a feed chamber (14) and the other consumer chamber (15, 13) to a return chamber in two operating positions. In addition, two brake pistons (51, 52) are arranged in two opposite lying receiving areas (33, 34) of the control valve (30).

Abstract: In the case of ferries, floating bridges or the like, a bridge support and a ramp forming the connection to the bank are connected to one another pivotably via a pivot point. For adjusting the ramp incline, a differential cylinder is arranged between the bridge support and the ramp in the area of the pivot point. The piston surfaces of the differential cylinder are impinged upon with a pressure that adjusts itself in accordance with the respective loading of the ramp. The pressure in the cylinder chamber on the rod side is a measure of the bending moment in the connecting area of the ramp to the bridge support. A pressure limiting valve, serving as a safety valve, limits the pressure in the cylinder chamber on the rod side and consequently the bending moment in the connecting area of the ramp to the bridge support. The pressure limiting valve is arranged in a line connecting the two cylinder chambers directly to one another.

Abstract: A manually operable hydraulic pilot-control device having a continuously adjustable pressure-reducing valve, having a housing and, in a continuous housing bore, a control piston, actable upon by a control spring in opening direction of a connection between a pressure inlet and a control outlet and is actable upon in opposite direction by pressure in the control outlet, and its control spring is restrained between a first fixed stop of the control piston and a spring retainer, placeable against a second fixed stop of the control piston and is driveable by an axially guided plunger located at a first open end of the housing bore and is supportable spaced from the second stop of the control piston.

Abstract: A device in an end wall (3) of a pressure fluid cylinder (1) of the kind including a cylinder tube (2), which is provided with a longitudinal slot and having a transfer means for transferring a movement from a moveable piston (11) inside the cylinder through the slot, and which is sealed by at least an inner (4) sealing band, wherein the device is arranged for fastening the end of the sealing band (4) in the cylinder end wall (3). The invention is distinguished by the end wall (3) being provided with an axially extending recess (5), which includes a first portion (9) adapted for axial reception of the inner sealing band and a second portion (10) for axial reception of a screw (6), said screw being adapted to engage with part of its thread a sealing band (4) which is inserted into the recess (5).

Abstract: A compact hydraulic unit which can be used for cooling an electric motor sufficiently for continuous operation, having an annular cylindrical pressure medium container that has an outer external wall and an inner external wall as well as two end flanges, an electric motor that is sealed and is surrounded by the pressure medium container and cooled by a cooling air stream, and a hydraulic pump driveable by an electric motor. The pressure medium container fits closely around the electric motor and the inner external wall of the pressure medium container serves as a guide means for the cooling air stream flowing over the electric motor. By this, the entire volume of air flowing between the electric motor and the pressure medium container is fully utilized for cooling the electric motor and also flows closely along the housing of the motor over the winding heads of the electric motor that are located remotely from the single fan wheel.