Danfoss A/s

Sauer Danfoss Aps

Pistonpower Aps

Minibooster Hydraulics A/s

Danfoss Fluid Power A/s

Danfoss Power Solutions Aps

Svend Erik Thomsen

Thorkild Christensen

Erik Kyster

Hans Christian Petersen

Siegfried Zenker

Bendt Porskrog

Tom Rudolph

Johannes V Baatrup

Kjeld Buus Jensen

Finn Visgaard Nielsen

Poul Ennemark

Niels Bjarne Hansen

Poul H Pedersen

Soren N Sorensen

Poul Erik Hansen

Tom Tychsen

Carsten Christensen

Claus J Johansen

Carl Christian Dixen

Tage Christiansen

John Kristensen

Morten Hoeck Petersen

Leif Hansen

Jorgen Mads Clausen

Harry S Nissen

Christen Espersen

Peter Zavadinka

Lubos Vokel

Knud Meldgaard Jensen

Preben Christiansen

Thomas Bauer

Juraj Hanusovsky

Jorgen P Todsen

Jørgen Mads Clausen

Christian Eskildsen

Aksel Baagoe Jepsen

Jørgen P Todsen

Carl O Flagstad

Helge Soe Plougsgaard

Brian Petersen

Steen Slot

Svend Giversen

Jeroen Hinse

Smari Johannsson

Jens S Christensen

Michael Bach

Kjeld Aagaard

Torben Juul

Hans E Fogh

Bent Larsen

Vagn S Bender

Jan Maiboll Buhl

Hans J Cornett

Hans L Hansen

Jacob Madsen

Soren Pedersen

Oktay Goece

Jan Maibøll Buhl

A hydraulic actuator () is disclosed comprising a cylinder housing (), a piston () with a piston rod () being displaceably arranged inside the cylinder housing () and a pressure amplifier () comprising an inlet section () with a pressure inlet port (), an active section () with a high pressure outlet port (), a low pressure chamber () and a high pressure chamber (). It is an objective of the invention to provide a hydraulic actuator () with a modular pressure amplifier (). To this end, the hydraulic actuator () comprises a cartridge pressure amplifier () comprising a sleeve () being arranged at least partially inside the piston rod (), and wherein the pressure amplifier () is stationarily arranged inside the sleeve ().

Hydraulic actuator with cartridge pressure amplifier

A hydraulic system () is provided comprising a pressure source (), an output (), and a pressure booster () arranged between the pressure source () and the output (). The operational possibilities of such a system should be extended. To this end inactivating means are provided inactivating or activating said pressure booster.

Hydraulic system

The invention concerns a hydraulic steering () with a steering unit () with feedback behavior, a steering motor () connected to the steering unit () via working pipes (L, R), a steering member () and a feedback suppression device (), which is located in at least one working pipe (L, R). It is endeavored to change the feedback behavior of such a steering in a simple manner. For this purpose, the feedback suppression device () has a valve arrangement () with hydraulic control inlet (C).

Hydraulic steering

The invention concerns a hydraulic valve arrangement () with a supply connection arrangement comprising a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement comprising two working connections (A, B), which can be connected to a motor (), a directional valve arrangement () located between the supply connection arrangement (P, T) and the working connection arrangement (A, B), and a compensation valve () acted upon in a first activation direction by a pressure in a first pressure chamber (), which is connected to a load-sensing pipe (LS), and, if required, by a spring (), and in a second activation direction opposite to the first activation direction by a pressure downstream of the directional valve arrangement (), said pressure acting in a second pressure chamber (), the compensation valve () having an inlet () and an outlet (). In connection with a post-compensated valve, it is endeavored to adjust the load pressures at the working connections (A, B) in dependence of the direction. For this purpose, each working connection (A, B) is connected to a control system, which amplifies the effect of the pressure in the first pressure chamber () on the compensation valve () in dependence of a pressure ruling at the working connection (A, B).

Hydraulic valve arrangement

The invention concerns a hydraulic steering with a steering initiator, a steering unit with feedback properties, which can be activated by the steering initiator, the steering unit having a supply connection arrangement with a pressure connection (P) and a tank connection (T) and a working connection arrangement with two working connections (L, R), an auxiliary-force operated steering valve, which is located in parallel with the steering unit between the supply connection arrangement (P, T) and the working connection arrangement (L, R), and a feedback suppressing device, which is active, when the steering valve is active. It is endeavored to find a simple manner of ensuring the priority of the steering initiator over the steering valve. For this purpose, the steering initiator interacts with an activation sensor, which deactivates the feedback suppressing device on an activation of the steering initiator.

The invention concerns a hydraulic steering with a steering initiator, a steering unit with feedback properties, which can be activated by the steering initiator, the steering unit having a supply connection arrangement with a pressure connection (P) and a tank connection (T) and a working connection arrangement with two working connections (L, R), an auxiliary-force operated steering valve, which is located in parallel with the steering unit between the supply connection arrangement (P, T) and the working connection arrangement (L, R), and a feedback suppressing device, which is active, when the steering valve is active. It is endeavoured to find a simple manner of ensuring the priority of the steering initiator over the steering valve. For this purpose, the steering initiator interacts with an activation sensor, which deactivates the feedback suppressing device on an activation of the steering initiator.

The invention concerns a hydraulic steering () with a supply connection arrangement (P, T), a steering motor () and a steering unit () between the supply connection arrangement and the steering motor (), the steering unit () having a directional section () and a measuring section (), a steering valve () being arranged in parallel to the steering unit (). With such a steering, it is endeavored to achieve the best possible safety. For this purpose, it is ensured that for each steering direction the directional section () comprises a first outlet (AL, AR), which is connected to the steering motor () by means of a first pipe (), and a second outlet (AL, AR), which is connected to the steering motor () by means of a second pipe (), the first outlet (AL, AR) being, in the neutral position of the directional section (), connected to the measuring section (), and the first pipe () being interruptible by means of a valve arrangement ().

The invention concerns a hydraulic steering arrangement () with a supply connection arrangement (P, T), a working connection arrangement (A, B) connectable to a steering motor (), a steering unit () located between the supply connection arrangement (P, T) and the working connection arrangement (A, B), and a steering valve () whose outlet is connected to the working connection arrangement (A, B). It is endeavored to keep the load of such a steering arrangement small. For this purpose, the steering unit () is made as an open-center steering unit, an inlet () of the steering valve () being connected to a pressure supply arrangement () that can be activated by an activation of the steering valve ().

Hydraulic steering arrangement

The invention concerns a hydraulic control () with a supply connection arrangement () having a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement having two working connections (A, B) connectable with a consumer, a control valve () with a valve element () between the supply connection arrangement and the working connection arrangement and a compensation valve (), which is located between the high-pressure connection (P) and the control valve () and is acted upon in the closing direction by a pressure between the compensation valve () and the control valve (). It is endeavoured to ensure the most favourable energy consumption possible. For this purpose, in the opening direction the compensation valve () is acted upon by a pressure of a selection device (), which optionally supplies the compensation valve () with a pressure control pressure or a flow control pressure.

Hydraulic control

The invention concerns a pressure reduction valve () with a housing (), a valve element () being displaceable in the housing and acted upon in one direction by a pressure in a low-pressure chamber connected with an outlet () and in the opposite direction by the force of a spring (), which is arranged in a spring chamber () in the housing (). It is endeavoured to improve the dynamic behaviour of the pressure reduction valve. For this purpose, a pilot flow path () connects the low-pressure chamber () and the spring chamber () with each other.

Pressure reduction valve

A hydraulic vehicle drive, particularly for mobile hoisting platforms, has a first pair of wheels drivable by first wheel motors in dependence of a first control valve and a second pair of wheels provided with second hydraulic motors. A switching arrangement short-circuits the second hydraulic motors in the driving-free state and for cooling supplies them with a flushing flow. In the driven state a second control valve, in dependence of which the second hydraulic motors are drivable, is activated, and if required connected with the first control valve. Thus, optionally, the first wheel pair can be driven alone or together with a certain driving output from the second wheel pair.

Hydraulic vehicle drive and valve module for same

A hydraulic steering arrangement for vehicles is proposed, with a steering motor, a flow amplifier in fluid connection therewith, which amplifies a fluid flow measured by a steering measuring device, at least one sensor, which determines a performance characteristic of the vehicle, and a control device, which changes the amount of fluid supplied to the steering motor in dependence on an output signal of the sensor. In a steering arrangement of that kind, it is intended to correct or adapt the steering behavior to the operational status of the vehicle using simple means. For that purpose, the control device changes the amplification factor of the flow amplifier.

Hydraulic steering arrangement for vehicles

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Nordborg, Denmark

Svend Erik Thomsen