WO2022023222A1 - Dispositif de direction hydrostatique - Google Patents

Dispositif de direction hydrostatique Download PDF

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Publication number
WO2022023222A1
WO2022023222A1 PCT/EP2021/070750 EP2021070750W WO2022023222A1 WO 2022023222 A1 WO2022023222 A1 WO 2022023222A1 EP 2021070750 W EP2021070750 W EP 2021070750W WO 2022023222 A1 WO2022023222 A1 WO 2022023222A1
Authority
WO
WIPO (PCT)
Prior art keywords
steering
valve
hydraulic
steering device
wheel
Prior art date
Application number
PCT/EP2021/070750
Other languages
German (de)
English (en)
Inventor
Robert Haid
Original Assignee
TECO GmbH transport engineering consulting
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TECO GmbH transport engineering consulting filed Critical TECO GmbH transport engineering consulting
Publication of WO2022023222A1 publication Critical patent/WO2022023222A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/09—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves

Definitions

  • the invention relates to a hydrostatic steering device according to the preamble of claim 1.
  • the hydraulic pump delivers fluid to a steering cylinder.
  • the fluid causes an off deflection of the piston of the hydraulic cylinder, which causes a Ver position of a running direction of a wheel via the piston rod.
  • An adjustment of the steering wheel causes only the change in the size of an opening of a valve for setting a volumetric flow supplied to the steering cylinder. If there is a leak in the hydraulic circuit or if the hydraulic pump fails, serious accidents can occur because steering with the steering wheel is then no longer possible.
  • the invention is based on the object of developing a generic hydrostatic steering device in such a way that safe steering is possible.
  • the hydrostatic steering device comprises a corresponding second element.
  • the steering device includes a second hydraulic steering circuit with a second fluid. Consequently, the hydrostatic steering device comprises as second elements a second position sensor for determining the position of the steering wheel, a second hydraulic pump for delivering the second fluid in the second hydraulic steering circuit, a second steering cylinder for adjusting the direction of travel of the wheel of the working machine, a second valve for setting a dem second steering cylinder supplied volume flow of the second fluid and a second control unit for controlling the second valve depending on the position of the steering wheel.
  • the second elements are part of the second hydraulic steering circuit. Because all the first elements are redundant, safe steering is possible.
  • the hydrostatic steering device can be designed in such a way that the mobile working machine can still be steered even if one hydraulic steering circuit fails. In this way, accidents due to the failure of the steering device can be avoided.
  • the first hydraulic steering circuit and the second hydraulic steering circuit are designed to be fluidically completely separate from one another. Before geous there is no pressure equalization between the first fluid and the second fluid.
  • the first steering cylinder and the second steering cylinder expediently act on the same wheel to change the running direction of the wheel.
  • the first steering cylinder and the second steering cylinder actuate a steering axis of the hydrostatic steering device simultaneously. If one of the two hydraulic steering circuits fails, the running direction of the wheel can also be adjusted by one of the two steering cylinders alone.
  • the first steering cylinder and the second steering cylinder are operatively connected via a tie rod. An adjustment of a steering cylinder causes an adjustment of the other steering cylinder.
  • the first steering cylinder and the second steering cylinder are advantageously connected in series.
  • the first steering cylinder and the second steering cylinder expediently comprise a common piston rod. Both a first piston of the first steering cylinder and a second piston of the second steering cylinder are fastened to the common piston rod. As a result, the first steering cylinder and the second steering cylinder are connected in series in a simple manner.
  • the steering device is advantageously designed in such a way that the direction of travel of the wheel can be adjusted with one of the two hydraulic steering circuits alone. This enables safe steering.
  • the steering device is designed such that when the pressure drops in one of the two hydraulic steering circuits below a specified threshold value, the associated hydraulic pump is switched off and the steering device is only operated with the other hydraulic steering circuit. As a result, an unnecessary loss of fluid can be avoided. This can protect the environment.
  • the steering device expediently has a third control unit.
  • the third control unit causes the associated hydraulic pump to be switched off when there is a drop in pressure in the first hydraulic steering circuit or in the second hydraulic steering circuit.
  • the first valve and the second valve are advantageously proportional valves.
  • the first hydraulic steering circuit also includes a steering valve that is mechanically connected to the steering wheel. Due to the mechanical connection to the steering wheel, a vehicle driver receives feedback on the steering resistance on the wheel when the steering wheel is operated. In contrast to a purely electronic transmission of the position of the steering wheel to a valve, the vehicle driver receives a steering feel when the steering wheel is mechanically connected to the steering valve . If, for example, the first position sensor for determining the position of the steering wheel fails, the first hydraulic steering circuit can continue to contribute to the steering via the steering valve mechanically controlled by the steering wheel. This further safeguards the steering function.
  • the volume flow of the first fluid supplied to the first steering cylinder is advantageously determined jointly by the first valve and the steering valve. Part of the The volume flow supplied to the first steering cylinder is contributed by the first valve and another part by the steering valve.
  • the first valve and the steering valve are expediently connected in parallel in the first hydraulic steering circuit.
  • the first hydraulic pump delivers the first fluid to the first valve in a first section of a first connecting line of the first hydraulic steering circuit, that the first hydraulic pump delivers the first fluid to the steering valve in a second section of the first connecting line and that the first Section and the second section form a bifurcation of the first connecting line.
  • the volume flow of the first fluid supplied to the first steering cylinder can easily be composed of the partial volume flow through the first valve and the further partial volume flow through the steering valve.
  • the first section and the second section open into one another in the first hydraulic steering circuit between the first valve and the first steering cylinder.
  • the partial volume flows from the first valve and from the steering valve can be brought together and form the volume flow supplied to the first steering cylinder.
  • the partial volume flow through the steering valve can be adjusted by means of the steering valve.
  • the steering valve for adjusting the volume of the partial volume flow is mechanically connected to the steering wheel.
  • the steering device is designed as a retrofit kit.
  • the hydrostatic steering device can replace an existing steering device in a vehicle.
  • the safety of a vehicle with an existing steering device can be subsequently increased.
  • Fig. 1 is a schematic perspective view of a mobile work machine
  • FIG. 2 shows a schematic representation of a steering device from FIG. 1.
  • the mobile working machine 2 is a dump truck.
  • the mobile work machine is a tractor, a truck or any other heavy-duty vehicle or agricultural vehicle.
  • the working machine 2 has a wheel 4 and a steering wheel 3 .
  • the wheel 4 can be rotated about an axis of rotation 7 .
  • the wheel 4 is rotatably mounted on a non-illustrated chassis of the working machine 2.
  • the direction of travel of the work machine 2 is determined by the position of the wheel 4 in relation to the chassis.
  • the direction of travel of the working machine 2 is determined by the running direction 8 of the wheel 4 .
  • the running direction 8 of the wheel 4 is oriented perpendicular to the axis of rotation 7 of the wheel 4 .
  • the running direction 8 is adjustable in relation to the chassis.
  • the wheel 4 can be pivoted about a pivot axis 33 .
  • the pivot axis 33 is perpendicular to the axis of rotation 7 and perpendicular to the running direction 8.
  • the work machine 2 can be designed for autonomous operation and autonomous steering.
  • the work machine 2 is designed for operation by a vehicle driver who is in the machine. A remote control of the working machine 2 and its steering are possible. It can also be provided that the work machine can be operated in an autonomous mode or in a guided mode.
  • the work machine 2 has a steering device 1 shown in FIG. 2 .
  • the steering device 1 comprises several first elements.
  • the first elements are part of a first hydraulic steering circuit 12.
  • the first hydraulic steering circuit 12 has a first fluid 13 on.
  • the first fluid 13 is delivered in the first hydraulic steering circuit 12 by a first hydraulic pump 14 .
  • the first fluid 13 is hydraulic oil.
  • the fluid 13 can also be any other liquid.
  • the first elements of the first hydraulic steering circuit 12 include at least a first position sensor 11, the first hydraulic pump 14, a first steering cylinder 15, a first valve 16 and a first control unit 17.
  • the first fluid 13 is supplied in a first connecting line 34 by the first hydraulic pump 14 to the first steering cylinder 15 out.
  • the first position sensor 11 is used to determine a position of the steering wheel 3 .
  • the steering wheel 3 can be rotated about the axis of rotation 9 .
  • the steering wheel 3 has a basic position.
  • the basic position of the steering wheel 3 is connected to a straight-ahead position of the wheel 4.
  • work machine 2 travels straight ahead.
  • the steering wheel 3 can be deflected into a position other than the basic position.
  • the deflection of the steering wheel 3 from its basic position can be detected with the first position sensor 11 .
  • the first position sensor 11 is a rotation angle sensor.
  • the first position sensor 11 is electronically connected to the first control unit 17 .
  • the first position sensor 11 forwards the position of the steering wheel 3 to the first control unit 17 via an electronic signal.
  • the first control unit 17 controls the first valve 16 depending on the position of the steering wheel 3.
  • the first control unit 17 sends an electronic signal to the first valve 16, on the basis of which the first valve 16 controls the flow of a Volume flow of the first fluid 13 through the first valve 16 is a.
  • the size of a line cross-sectional area for the first fluid 13 is set by means of the first valve 16 .
  • the first valve 16 is a proportional valve.
  • the first steering cylinder 15 converts hydraulic energy into a steering movement of the wheel 4 .
  • the first steering cylinder 15 has a first pressure chamber 18.
  • the first fluid 13 is conveyed by the first hydraulic pump 14 through the first valve 16 into the first pressure chamber 18 of the first steering cylinder 15.
  • the first steering cylinder 15 has a first piston 19 .
  • the steering device 1 is designed in such a way that the deflection of the first piston 19 from a rest position is proportional to the deflection of the steering wheel 3 from its basic position.
  • the rest position of the first piston 19 is connected to a running direction 8 of the wheel 4 in the direction of a straight-ahead direction of travel of the working machine 2 .
  • the first steering cylinder 15 is used to adjust the running direction 8 of the wheel 4.
  • the first piston 19 of the first steering cylinder 15 is fixed to a first piston rod 5.
  • the first piston rod 5 steers the wheel 4.
  • the running direction 8 of the wheel 4 is changed in the process.
  • the wheel 4 is pivoted about the pivot axis 33 .
  • the first piston rod 5 is connected to the wheel 4 in a known manner.
  • the hydrostatic steering device 1 includes a corresponding second element for each first element.
  • the second elements include at least a second position sensor 21, a second hydraulic pump 24, a second steering cylinder 25, a second valve 26 and a second control unit 27.
  • the second elements are part of a second hydraulic steering circuit 22.
  • a second fluid 23 promoted by the second hydraulic pump 24 In the exemplary embodiment, the second fluid 23 is hydraulic oil.
  • the second fluid 23 can also be any other liquid.
  • the second elements are arranged in the second hydraulic steering circuit 22 .
  • the second fluid 23 is in a second connecting line 35 from the second hydraulic pump 24 to the second steering cylinder 25 out.
  • the second steering cylinder 25 has a second piston 29 and a second pressure chamber 28 .
  • the second hydraulic steering circuit 22 is routed separately from the first hydraulic steering circuit 12 .
  • the first fluid 13 is guided in a different line system than the second fluid 23 .
  • the two line systems are fluidically separated from each other. There is no pressure equalization between the two line systems.
  • the second position sensor 21 is used to determine the position of the steering wheel 3.
  • the second position sensor 21 is a rotation angle sensor.
  • the second position sensor 21 is electronically connected to the first control unit 27 .
  • the second position sensor 21 forwards the position of the steering wheel 3 to the second control unit 27 via an electronic signal.
  • the second control unit 27 controls the second valve 26 depending on the position of the steering wheel 3.
  • the second control unit 27 sends an electronic signal to the second valve 26, on the basis of which the second valve 26 controls the flow of a Volume flow of the second fluid 23 through the second valve 16 adjusts.
  • the size of a line cross-sectional area for the second fluid 23 is set by means of the second valve 26 .
  • the second valve 26 is a proportional valve.
  • the second fluid 13 is conveyed by the second hydraulic pump 24 through the second valve 26 into the second pressure chamber 28 of the second steering cylinder 25 .
  • the second piston 29 is deflected.
  • the steering device 1 is designed in such a way that the deflection of the second piston 29 from a rest position is proportional to the deflection of the steering wheel 3 from its basic position.
  • the rest position of the second piston 29 is connected to a running direction 8 of the wheel 4 in the direction of a straight-ahead direction of travel of the working machine 2 .
  • the second steering cylinder 25 is used to adjust the running direction 8 of the wheel 4.
  • the wheel 4 is pivoted about the pivot axis 33.
  • the second piston 29 of the second steering cylinder 25 is fixed to a second piston rod 37 .
  • the second piston rod 37 also moves.
  • the second piston rod 37 is connected to the wheel 4 via a tie rod 36 .
  • the second piston rod 37 is connected to the first piston rod 5 via the tie rod 36 .
  • the first steering cylinder 15 is operatively connected to the second steering cylinder 25 in such a way that an adjustment of one steering cylinder 15, 25 causes an adjustment of the other steering cylinder 25, 15.
  • An adjustment of the first steering cylinder 15 causes an adjustment of the second steering cylinder 25.
  • An adjustment of the second steering cylinder 25 causes an adjustment of the first steering cylinder 15.
  • a steering cylinder 15, 25 is adjusted, its piston 19, 29 is adjusted.
  • the piston 19, 29 is moved relative to a base body 38, 39.
  • the first steering cylinder 15 has the first base body 38 .
  • the second steering cylinder 39 has the second base body 39 .
  • the first piston 19 is attached to the first piston rod 5 .
  • the second piston 29 is fastened.
  • the work machine 2 has a further wheel 40 .
  • the tie rod 36 ver connects the wheel 4 to the other wheel 40.
  • the other wheel 40 is mounted pivotably about a further pivot axis 44. Pivoting the wheel 4 about the pivot axis 4 causes the further wheel 40 to pivot about the further pivot axis 44.
  • the pivot position of the further wheel 40 is dependent on the pivot position of the wheel 4 through the tie rod 36 and vice versa.
  • the first steering cylinder 15 and the second steering cylinder 25 act simultaneously on the wheel 4.
  • the first steering cylinder 15 and the second steering cylinder 25 act simultaneously on the tie rod 36.
  • the steering device 1 is designed in such a way that the direction of travel of the wheel 4 can be adjusted with one of the both hydraulic steering circuits 12, 22 alone is possible.
  • the elements of the first hydraulic steering circuit 12 are marked with ge dashed lines.
  • the elements of the second hydraulic steering circuit 22 are also circled with a dashed line.
  • the first hydraulic steering circuit 11 includes a first pressure gauge 10.
  • the first pressure gauge 10 is between the first valve 16 and the first steering cylinder 15 net angeord.
  • the first pressure gauge 10 measures the pressure in the first hydraulic steering circuit 11 in the first connecting line 34.
  • the first pressure gauge 10 is connected to a third control unit 6 electronically.
  • the pressure in the first hydraulic steering circuit 11 is transmitted to the third control unit 6 in the form of an electronic signal. If the pressure falls below a threshold value stored in the third control unit 6, the first hydraulic pump 14 is switched off.
  • the steering device 1 is then only operated with the second hydraulic steering circuit 22 .
  • the third control unit 6 sends an electronic signal to the first control unit 17.
  • the first control unit 17 then causes the first hydraulic pump 14 to be switched off by means of a electronic signal.
  • the first hydraulic steering circuit 12 allows the first piston 19 to be adjusted.
  • the second hydraulic steering circuit 21 includes a second pressure gauge 20.
  • the second pressure gauge 20 is arranged between the second valve 26 and the second steering cylinder 25.
  • the second pressure gauge 20 measures the pressure in the second hydraulic steering circuit 21 in the second connecting line 35.
  • the second pressure gauge 20 is electronically connected to the third control unit 6.
  • the pressure in the second hydraulic steering circuit 21 is transmitted to the third control unit 6 in the form of an electronic signal. If the pressure falls below a threshold value stored in the third control unit 27, the second hydraulic pump 24 is switched off.
  • the steering device 1 is then only operated with the first hydraulic steering circuit 11 .
  • the third control unit 6 sends an electronic signal to the second control unit 27.
  • the second control unit 27 then causes the second hydraulic pump 24 to be switched off by means of an electronic signal.
  • the second hydraulic steering circuit 22 allows the second piston 29 to be adjusted.
  • the third control unit 6 is electronically connected to the first control unit 17 and the second control unit 27 .
  • the first pressure gauge 10 is electronically connected to the third control unit 6 .
  • the second pressure gauge 20 is electronically connected to the third control unit 6 .
  • the pressure values from the first pressure gauge 10 and the second pressure gauge 20 are transmitted electronically to the third control unit 6 .
  • the first control unit 17 is electronically connected to the first hydraulic pump 14 .
  • the second control unit 27 is electronically connected to the second hydraulic pump 24 .
  • the first hydraulic steering circuit 12 also includes a steering valve 30.
  • the steering valve 30 is mechanically connected to the steering wheel 3.
  • a part of the first fluid 13 of the first hydraulic steering circuit 12 is conveyed through the steering valve 30 .
  • Another part of first fluid 13 of the first hydraulic steering circuit 12 is promoted by the first valve 16 ge.
  • the partial volume flow of the first fluid 13 conveyed through the steering valve 30 is determined by the steering valve 30 .
  • a line cross-sectional area for the ge promoted first fluid 13 can be mechanically adjusted by operating the steering wheel 3 who the.
  • a partial volume flow of the first steering cylinder 15 supplied volume flow of the first fluid 13 can be adjusted by means of the steering valve 30 .
  • the steering valve 30 is mechanically connected to the steering wheel 3 .
  • the volume flow of the first fluid 13 supplied to the first steering cylinder 15 is determined jointly by the first valve 16 and the steering valve 30 .
  • This the first steering cylinder 15 supplied volume flow is composed of a mechanical volume flow part of the first fluid 13, which passes the steering valve 30, and an electronics part volume flow of the first fluid 13, which passes the first valve 16 together.
  • the steering device 1 is designed in such a way that the mechanical partial volume flow of the first fluid 13 is sufficient in every position of the steering valve 30 to move the first piston 19 . In this case, the steering device 1 is matched to the axle load of the working machine 2 .
  • the electronics partial volume flow is typically 150% to 250%, in particular 175% to 225% of the mechanical partial volume flow.
  • the mechanical partial volume flow is advantageously 20% to 40%, in particular 30% to 35% of the volume flow that is supplied to the first steering cylinder 15 .
  • the electronics partial volume flow is 50% to 80%, advantageously 60% to 70%, preferably 65% to 70% of the volume flow that is supplied to the first steering cylinder 15 .
  • the first valve 16 and the steering valve 30 are connected in parallel in the first hydraulic steering circuit 12 .
  • the first valve 16 and the steering valve 30 are in the first connecting line 34 Ver connected in parallel.
  • the first hydraulic pump 14 delivers the first fluid 13 to the first valve 16.
  • the first hydraulic pump 14 conveys the first fluid 13 to the steering valve 30 in a second section 32 of the first connecting line 34.
  • the first section 31 and the second section 32 form a bifurcation of the first connecting line 34.
  • the first connecting line 34 fluidly connects the first hydraulic pump 14 to the first Steering cylinder 15.
  • the first fluid 13 is guided in the first connecting line 34.
  • the first section 31 and the second section 32 open into one another in the first hydraulic steering circuit 12 between the first valve 16 and the first steering cylinder 15 .
  • the first valve 16 is arranged in the first section 31 .
  • the steering valve 30 is arranged in the second section 32 .
  • the second connecting line 35 fluidly connects the second hydraulic pump 24 to the second steering cylinder 25.
  • the second fluid 23 is guided in the second connecting line 35.
  • the second valve 26 is arranged in the second connecting line 35 at.
  • first connecting line 34 between the first hydraulic pump 14 and the first steering cylinder 15 is shown as an example.
  • the first connecting line 34 leads into the first pressure chamber 18 of the first steering cylinder 15.
  • the first steering cylinder 15 has a further pressure chamber 41 which is arranged on the other side of the first piston.
  • a further connecting line leads from the first hydraulic pump 14 to this further pressure chamber 41 .
  • the further connecting line is not shown in FIG. 2 for reasons of clarity.
  • the same valves as in the first connecting line 34 are arranged in the further connecting line.
  • the first valve 16 is arranged both in the first connecting line 34 and in the further connecting line.
  • the steering valve 30 is arranged connecting line both in the first connecting line 34 and in the further Ver.
  • the first pressure chamber 18 is fluidically separated from the further pressure chamber 41 by the first piston 19 .
  • the first connecting line 34 and the other not shown Connecting lines connect the further pressure chamber 41 via the first hydraulic pump 14 to the first pressure chamber 18.
  • the first fluid 13 can be conveyed from the first pressure chamber 18 into the further pressure chamber 41 and vice versa.
  • the first piston 19 is displaced and the first piston rod 5 is displaced relative to the first base body 38 .
  • the first hydraulic pump 14 pumps the first fluid 13 from the first pressure chamber 18 of the first steering cylinder 15 into the further pressure chamber 41 of the first steering cylinder 15 or from the further pressure chamber 41 into the first pressure chamber 18.
  • a second, not shown, further connection line Ver is provided in the second hydraulic steering circuit 22 .
  • the second further connecting line connects a second further pressure chamber 42 of the second steering cylinder 25 to the second hydraulic pump 24.
  • the second valve 27 is arranged both in the second connecting line 35 and in the second further connecting line.
  • the working pressure of the first fluid 13 is greater than the working pressure of the second fluid 23.
  • the first hydraulic steering circuit 12 is the lead steering circuit, which the second hydraulic steering circuit 22 follows.
  • the pressure with which the first piston 19 is moved by the first fluid 13 is greater than the pressure with which the second piston 29 is moved by the second fluid 23 .
  • the pressure with which the first piston 19 is moved by the first fluid 13 is 100.1% to 110%, in particular 100.1% to 101% of the pressure with which the second piston 29 is moved by the second fluid 23 .
  • the second piston 29 follows the movement of the first piston 19.
  • the second piston 29 is connected to the first piston 19 via the tie rod 36.
  • the steering device 1 can be used in various mobile machines with ver different axle loads. In this case, the volume flows to the steering cylinders 15 and 25 are adapted to the respective axle load by adjusting the valves 16 and 26.
  • the steering valve 30 of the first hydraulic steering circuit 12 can be designed in the same way for different axle loads.
  • the steering device 1 is designed as a retrofit kit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

L'invention concerne un dispositif de direction hydrostatique pour une machine de travail mobile (2) comprenant un volant de direction (3) et les premiers éléments suivants, qui font partie d'un premier circuit de direction hydraulique (12) contenant un premier fluide (13) : - un premier capteur de position (11) pour déterminer une position du volant de direction (3), - une première pompe hydraulique (14) pour transporter le premier fluide (13) dans le premier circuit de direction hydraulique (12), - un premier cylindre de direction (15) pour régler une direction de déplacement (8) d'une roue (4) de la machine de travail (2), - une première vanne (16) pour régler un débit volumétrique du premier fluide (13) fourni au premier cylindre de direction (15), et - une première unité de commande (17) pour commander la première vanne (16) en fonction de la position du volant de direction (3). Tous les premiers éléments sont redondants, et ainsi le dispositif de direction hydrostatique (1) comprend un second élément correspondant pour chaque premier élément. Le dispositif de direction (1) comprend un second circuit de direction hydraulique (22) contenant un second fluide (23), dans lequel les seconds éléments sont agencés.
PCT/EP2021/070750 2020-07-29 2021-07-23 Dispositif de direction hydrostatique WO2022023222A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202020104388.9U DE202020104388U1 (de) 2020-07-29 2020-07-29 Hydrostatische Lenkvorrichtung
DE202020104388.9 2020-07-29

Publications (1)

Publication Number Publication Date
WO2022023222A1 true WO2022023222A1 (fr) 2022-02-03

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ID=72333994

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Application Number Title Priority Date Filing Date
PCT/EP2021/070750 WO2022023222A1 (fr) 2020-07-29 2021-07-23 Dispositif de direction hydrostatique

Country Status (2)

Country Link
DE (1) DE202020104388U1 (fr)
WO (1) WO2022023222A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021206201A1 (de) 2021-06-17 2022-12-22 Zf Friedrichshafen Ag Lenkgetriebevorrichtung für ein Kraftfahrzeug

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2944883A1 (de) * 1979-11-07 1981-05-21 Danfoss A/S, 6430 Nordborg Hydrostatische lenkeinrichtung
WO1989010865A1 (fr) * 1988-05-11 1989-11-16 Siemens Aktiengesellschaft Unite de commande du braquage des roues arriere de vehicules de voirie
DE19839951A1 (de) * 1998-09-02 2000-03-09 Daimler Chrysler Ag Lenksystem für nicht spurgebundene Kraftfahrzeuge
DE102011009822A1 (de) * 2011-01-31 2012-08-02 Liebherr-Werk Ehingen Gmbh Mobilkran mit aktiver Hinterachslenkung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2944883A1 (de) * 1979-11-07 1981-05-21 Danfoss A/S, 6430 Nordborg Hydrostatische lenkeinrichtung
WO1989010865A1 (fr) * 1988-05-11 1989-11-16 Siemens Aktiengesellschaft Unite de commande du braquage des roues arriere de vehicules de voirie
DE19839951A1 (de) * 1998-09-02 2000-03-09 Daimler Chrysler Ag Lenksystem für nicht spurgebundene Kraftfahrzeuge
DE102011009822A1 (de) * 2011-01-31 2012-08-02 Liebherr-Werk Ehingen Gmbh Mobilkran mit aktiver Hinterachslenkung

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