EP1574626A1 - Système hydraulique - Google Patents

Système hydraulique Download PDF

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Publication number
EP1574626A1
EP1574626A1 EP05101766A EP05101766A EP1574626A1 EP 1574626 A1 EP1574626 A1 EP 1574626A1 EP 05101766 A EP05101766 A EP 05101766A EP 05101766 A EP05101766 A EP 05101766A EP 1574626 A1 EP1574626 A1 EP 1574626A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
control unit
switching
switching valve
chamber
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP05101766A
Other languages
German (de)
English (en)
Other versions
EP1574626B1 (fr
Inventor
Marcus Bitter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Publication of EP1574626A1 publication Critical patent/EP1574626A1/fr
Application granted granted Critical
Publication of EP1574626B1 publication Critical patent/EP1574626B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with load-holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure

Definitions

  • the invention relates to a hydraulic arrangement for a passive suspension system, with a first and a second Chambered hydraulic cylinder, a hydraulic tank, a hydraulic fluid conveying means, a Hydraulic accumulator, one between hydraulic accumulator and first Chamber arranged hydraulic line, one in the Hydraulic line arranged switching valve, a first Supply line for the first chamber, a second Supply line for the second chamber, one in the first Supply line arranged pipe rupture protection device and a control unit with at least three switch positions, which a lifting position, a lowered position and a Include neutral position for the hydraulic cylinder.
  • a hydraulic suspension system to use the boom or the rocker cushions to a total of the vehicle improved suspension comfort, especially while driving, to achieve.
  • This is done by means of a suitable hydraulic arrangement of valves the lifting side of a Hydraulic cylinder connected to a hydraulic accumulator around one To effect suspension through the hydraulic accumulator.
  • the Lower side of the hydraulic cylinder with a hydraulic tank connected, on the one hand to a cavitation on the lowering side avoid and on the other hand a free movement of the piston rod to allow during the suspension process.
  • EP 1 157 963 A2 relates to a monitoring device pointed in the form of a sensor on the control unit, with the is to be detected, whether the boom should lower or Not. Without or with defective monitoring device for the Control unit or for the "lowering function" it could Faulty circuits in the hydraulic arrangement come.
  • the object underlying the invention is seen therein a hydraulic arrangement of the type mentioned above create by which an effort to realize the "lowering function" is reduced. In particular, a malfunction should the hydraulic arrangement for the "lowering function" at nonexistent or defective monitoring device be excluded.
  • a hydraulic arrangement of the above mentioned type designed such that the control unit, a has further switching position, which is a suspension position represents, in which by the control unit at least the second supply line is connectable to the tank and at the same time connections of both supply lines to Subsidies are interrupted.
  • the controller has a fourth switching position, can on a second Switching valve for connecting the second chamber of Hydraulic cylinder with a tank, as with conventional Solutions provided is waived. With it reduced the technical effort is considerable, especially because of because monitoring the "lowering function" for the Hydraulic cylinder is eliminated.
  • only one Switching valve used with the only the stroke side of the Hydraulic cylinder is connected to the hydraulic accumulator.
  • a fourth shift position according to the invention provides the Advantage that in addition to a lifting position and a lowered position furthermore a neutral position for the hydraulic cylinder can be provided in both supply lines are closed.
  • the connection should between the lower side of the hydraulic cylinder and the tank preferably be closed, since there are applications with Wheel loaders, telehandlers and front loaders are, where a certain contact pressure under one on the boom attached tool is to be produced, resulting in a permanent connection to the tank would not be possible and so on would lead to a disadvantage compared to competing products. It is therefore an advantage of a fourth invention To add switching position and both the lifting and To provide lowering and neutral position.
  • the control unit may be configured such that fourth Switching a so-called floating position switched becomes.
  • the floating position is the first supply line interconnected with the second supply line and both supply lines connected to the tank, the second input to the control unit is closed, so no Supply on the part of the subsidy takes place.
  • a Floating position as fourth switching position is not mandatory required, it is sufficient if the fourth Switch position only the second chamber of Hydraulic cylinder connects to the tank.
  • the controller connects the second Supply line or the second and the first Supply line directly to tank, i. there will be no other valves or means needed (except one Connecting line from the control unit to the tank).
  • the control unit can be designed manually or electrically operated, Of course, other methods are conceivable are, for example, pneumatic or hydraulic methods, which, however, should not be explained in detail.
  • the switching valve preferably has a closed position and an open position, wherein the switching valve in the Closed position in one or both flow directions closes, but in the open position in both Flow directions opens so that a suspension function in Connection with the hydraulic accumulator occurs.
  • the Switching valve may be formed such that in the Closed position hydraulic fluid from the hydraulic cylinder to Hydro Eat can flow through, so that the hydraulic accumulator is always preloaded with the highest load pressure during a work cycle occurs. Furthermore, the switching valve also be designed such that it in the closed position seals in the opposite direction or in both directions. Furthermore, there are also bypasses of Switching valve by means of check valves and diaphragms conceivable to charge the hydraulic accumulator.
  • the switching valve is preferably electrically actuated. It goes without saying also conceivable that other types of actuation of the switching valve be used, for example, a manual, pneumatic or hydraulic actuation.
  • the suspension should be activated, which means a Switch can happen that the operator in the cabin of the Vehicle actuated, or for example by a Speed signal, so the switching valve is in his Open position and the controller in its fourth Switched position switched to the first chamber of the Hydraulic cylinder to connect to the tank.
  • a Switch can happen that the operator in the cabin of the Vehicle actuated, or for example by a Speed signal, so the switching valve is in his Open position and the controller in its fourth Switched position switched to the first chamber of the Hydraulic cylinder to connect to the tank.
  • the switching valve is preferably always then automatically closed, d. H. brought into the closed position, when the controller is in its neutral position, while the suspension is active.
  • a passing of the For example, neutral position may be required if the neutral position on the control unit directly between the lifting and Lowering position is arranged and from a lifting position to be switched directly into a lowered position.
  • the Time delay element provides that when simple Passing the neutral position switching the switching valve is not made. Only when a presettable Retention time is reached in neutral position, the Switching valve brought into the closed position.
  • an electronically or electrohydraulically controlled Control unit can, for example, in the control software also be taken into account that, for example, not operated joystick the control unit with activated suspension basically not in its neutral position but in the fourth switching position is moved. It would be too conceivable that, as usual with some wheel loaders, during the Lifting and lowering of the boom or the rocker the Suspension is always disabled. As a very simplified version of the system it would also be conceivable that the suspension is only active when the Control unit is located in its fourth switching position. On This type of electronic effort could be considerably reduce, since only one switch is needed, the Switching valve opens or closes.
  • the control device is preferably as a slide valve formed, which four switch positions, each with two Has inputs and outputs. In the individual positions are the supply lines in different ways according to the setting function (lifting, lowering, neutral position (Hold) and suspension) of the control unit with the funding or connected to the tank or closed.
  • the pipe rupture protection device preferably comprises a in Direction of the control unit closing check valve and a pressure relief valve, wherein the pressure relief valve through prevailing in the connecting lines pressures is controllable.
  • the control is done by Pilot pressure lines, which of the pressure relief valve in lead the first and the second supply line.
  • the Check valve is in a pressure relief valve arranged bypass bypass, wherein the Check valve opens towards the first chamber.
  • Other Possibilities for pipe burst protection are also conceivable.
  • duck switches can also be used in case of pressure drop, actuate a switching valve.
  • a hydraulic arrangement 10 shown in FIG. 1 shows Inventive embodiment for realizing a Suspension.
  • the hydraulic assembly 10 includes a switchable Control unit 12, for example, a slide valve, which via Hydraulic lines 14, 16 with a pump 18 and a Hydraulic tank 20 is connected, wherein the control unit 12 in four operating positions, lifting, neutral, lowering and Suspension position, is switchable.
  • the switching of the control unit 12 is preferably done by hand, but can also electrically, hydraulically or pneumatically.
  • first and second supply line 22, 24 is the Control unit 12 connected to a hydraulic cylinder 26, wherein the first supply line 22 into a first chamber 28 of the Hydraulic cylinder 26 and the second supply line 24 in a second chamber 30 of the hydraulic cylinder 26 leads.
  • One Piston 29 separates the two chambers 26, 28 from each other.
  • the first chamber 28 of the hydraulic cylinder 26 provides the piston-side or lift-side chamber, whereas the second chamber 30, the piston rod side and the lower side Represents chamber of the hydraulic cylinder.
  • the pipe rupture protection device 32 includes a pressure and spring-controlled pressure relief valve 34, as well a hydraulic cylinder side opening check valve 36, which via a bypass line 38 parallel to Pressure relief valve 34 is arranged.
  • a first Pressure line 40 is a pressure connection from Pressure limiting valve 34 to the hydraulic cylinder side Section of the first supply line 22 made.
  • a second pressure line 42 is another pressure connection from the pressure relief valve 34 to the second supply line 24th produced.
  • a spring 44 holds the Pressure limiting valve 34 in the closed position.
  • a hydraulic line 46 connects the first chamber 28 and the first supply line 22 with a hydraulic reservoir 48, wherein the end 50 not connected to the hydraulic accumulator 48 the hydraulic line 46 between the first chamber 28 and the Pipe rupture protection device 32 is arranged.
  • a switching valve 52 is arranged in the hydraulic line 46.
  • the switching valve 52 is an electrically switchable Seat valve is, which via a spring 54 in Closed position is held and a solenoid 56 in an open position can be brought.
  • the switching valve 52 seals in the closed position in the direction of Hydraulic accumulator 48 from.
  • the switching valve can also be designed so that it is in both directions seals leak-free.
  • In the open position is to Production of a suspension function between hydraulic cylinders 26 and hydraulic accumulator 48 a hydraulic flow in both Directions guaranteed.
  • the individual operating states can now via the Control unit 12 and controlled via the switching valve 52 become.
  • the control unit 12th held in neutral position by adjusting springs 60, 62.
  • the Switching valve 52 is in a closed position. about a control signal or, as shown in Figure 1, by manual operation, the control unit 12 by means of a Actuator 58 from the neutral position in the Lifting, lowering or suspension position brought. It can to be a manual, electric, hydraulic or pneumatic actuator 58 act.
  • Switch or sensor 64 will be the neutral position of Controller 12 detects and a signal to a control unit 66 sent.
  • the control unit 66 is connected to the switching valve 52 connected and holds or brings the switching valve 52 in Closed position when the control unit 12 in Neutral position is located.
  • the control unit 66 provided with a time delay element which causes only after a presettable dwell time of the controller 12 in the neutral position, the control unit 66, the switching valve 52 brings in the closed position. This will ensure that not every time the controller 12 switches, if only is switched over the neutral position, the Control unit 66, the switching valve 52 closes. The switching valve 52 is brought into the closed position only if the Control unit 12 actually switched to the neutral position becomes.
  • the pipe rupture device 32 thus ensures that the hydraulic cylinder 26 in neutral position maintains or in lifting and neutral position no oil from the pressurized first chamber 28 escape and that in Lowering the oil from the first chamber 28 over the open Pressure relief valve 34 can drain.
  • the lifting side of the side of the Hydraulic cylinder 26 is in which a pressure for lifting a load is built.
  • the stroke side is the first chamber 28 of the hydraulic cylinder 26, by turning the hydraulic cylinder 26 and the second Chamber 30 could serve as a lifting side.
  • the first pressure line 40 represents an overload protection, so that too high Operating pressures in the first chamber 28 of the hydraulic cylinder 26, for example, caused by excessive loads can, in the first pressure line 40 reaches a limit pressure is that opens the pressure relief valve 34 to reduce pressure.
  • connection is the second supply line 24 with the hydraulic tank 20th produced.
  • the connection of the first supply line 22 to the pump 18 or to the hydraulic tank 20 is closed or the connection remains closed when out of neutral is switched out into the suspension position.
  • alternative solution may also be in the suspension position Floating position to be switched. In such a Floating position is then the first supply line 22 through the control unit 12 with the second supply line 24th connected, wherein both supply lines 22, 24 with the Hydraulic tank 20 connected and the input to the control unit, on the pump 18 is connected to be closed. So long the switching valve 52 is in the closed position, i.
  • the Hydraulic accumulator 48 is separated from the hydraulic cylinder 26 and thereby the suspension is deactivated, the Piston 29 in the suspension position only in the direction of the second Move chamber 30. Only by activating the suspension, i. by adding the hydraulic accumulator 48, the Move plunger 29 resiliently, ie traversing in both directions.
  • the suspension is activated via a Activation switch 68, which sends an activation signal to the Control unit 66 outputs, whereupon they the switching valve 52 in Opening position brings.
  • the activation of the Suspension can also be done automatically by a Activation signal is generated as soon as the control unit 12 in the fourth switching position is switched.
  • FIG. 2 shows a mobile telescopic loader 82 with a on a housing 84th or frame of the telehandler 82 pivotally hinged, Telescopically extendable outrigger 86. Between outrigger 86 and housing 84 is a hydraulic cylinder 26 for lifting and Lowering of the boom 86 is arranged.
  • the hydraulic cylinder 26 is at a first and a second bearing 88, 90th hinged pivotally, wherein the piston rod side 92 at the second bearing 90 on the boom 86 and the piston bottom side 94 is hinged to the first bearing 88 on the housing 84.
  • the hydraulic tank 20, the pump 18 and the Control unit 12 is positioned on or in the housing 84 and over Hydraulic lines 14, 16, 96 connected to each other. Further are the supply lines 22, 24 between the control unit 12 and hydraulic cylinders 26 in FIG. 2.
  • the Pipe burst protection device 32 and the switching valve 52nd are located in a common valve block directly on the Hydraulic cylinder 26.
  • the hydraulic accumulator 48 is preferably also arranged directly on the hydraulic cylinder 26, so that between the common valve block and the Hydraulic accumulator 48, the hydraulic line 46 as a rigid Connection can be formed, no separate Raw rupture protection device required. About one not Control shown are generated control or switching signals, with which the control unit 12 and the switching valve 52 (see Fig. 1) are controlled or switched.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Vehicle Body Suspensions (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
EP05101766A 2004-03-13 2005-03-08 Système hydraulique de suspension passive Expired - Fee Related EP1574626B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004012362 2004-03-13
DE102004012362A DE102004012362A1 (de) 2004-03-13 2004-03-13 Hydraulische Anordnung

Publications (2)

Publication Number Publication Date
EP1574626A1 true EP1574626A1 (fr) 2005-09-14
EP1574626B1 EP1574626B1 (fr) 2007-08-08

Family

ID=34813688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05101766A Expired - Fee Related EP1574626B1 (fr) 2004-03-13 2005-03-08 Système hydraulique de suspension passive

Country Status (7)

Country Link
US (1) US7140178B2 (fr)
EP (1) EP1574626B1 (fr)
AU (1) AU2005201082B2 (fr)
CA (1) CA2500627C (fr)
DE (2) DE102004012362A1 (fr)
ES (1) ES2289652T3 (fr)
NZ (1) NZ538731A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2923352A1 (fr) * 2007-11-12 2009-05-15 Signalisation Moderne Autorout Machine de fauchage/debroussaillage/elagage munie d'un moyen d'amortissement de chocs
EP1914353A3 (fr) * 2006-10-19 2011-04-20 Hitachi Construction Machinery Co., Ltd. Engin de construction
CN105229242A (zh) * 2013-05-13 2016-01-06 卡特彼勒公司 用于作业机器液压回路的阀装置
EP3943440A1 (fr) * 2020-07-21 2022-01-26 Liebherr-Werk Nenzing GmbH Système hydraulique pour un support de chute en arrière et appareil de travail

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005038333A1 (de) * 2005-08-11 2007-02-15 Deere & Company, Moline Hydraulische Anordnung
US20090025352A1 (en) * 2007-02-26 2009-01-29 Angelle Clinton J Apparatus and Method for Handling a Cutting Device
AT505111B1 (de) 2007-04-12 2009-05-15 Rosenbauer Int Ag Einsatzvorrichtung zur brandbekämpfung
KR101655458B1 (ko) * 2009-12-24 2016-09-07 두산인프라코어 주식회사 건설기계의 유압펌프 제어용 밸브
US8176992B2 (en) 2010-05-28 2012-05-15 Cnh Canada, Ltd. Electronically controlled hydraulic system for an agricultural implement
DE102012106185B3 (de) * 2012-07-10 2013-11-21 Fsp Fluid Systems Partners Holding Ag Steueranordnung für ein hydropneumatisches Federungssystem sowie hydropneumatisches Federungssystem mit einer solchen Steueranordnung
DE102012021544B4 (de) * 2012-10-29 2014-07-10 Terex Cranes Germany Gmbh Teleskopiereinheit mit Zusatzfunktion
CN104033450B (zh) * 2014-05-28 2016-05-25 广西柳工机械股份有限公司 液控卸荷阀
CN105275907A (zh) * 2015-11-25 2016-01-27 上海电气液压气动有限公司 一种支撑油缸阀块装置
JP6723839B2 (ja) * 2016-06-09 2020-07-15 株式会社クボタ 作業機の油圧システム
JP7164294B2 (ja) * 2017-10-24 2022-11-01 株式会社小松製作所 作業車両
CN112384662A (zh) 2018-08-30 2021-02-19 沃尔沃建筑设备公司 用于建筑设备的液压回路
CN110541448B (zh) * 2019-09-12 2022-03-01 三一重机有限公司 挖掘机动臂液控系统和挖掘机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2090811A (en) * 1981-01-09 1982-07-21 Dresser Ind Hydraulic cylinder control system
US4522109A (en) * 1983-11-21 1985-06-11 J. I. Case Company Leak-detecting hydraulic system
JPS63265023A (ja) * 1987-04-20 1988-11-01 Kobe Steel Ltd 車両系建設機械の振動抑制装置
WO1990005814A1 (fr) * 1988-11-23 1990-05-31 A & T Hansson Konsult Ab Dispositif amortisseur de chocs pour machine mobile
EP1157963A2 (fr) * 2000-05-25 2001-11-28 J.C. Bamford Excavators Limited Système hydraulique pour un véhicule chargeur

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5116188A (en) * 1987-09-16 1992-05-26 Kabushiki Kaisha Kobe Seiko Sho Vibration suppressing device for wheeled construction equipment
EP0381788B1 (fr) * 1989-02-06 1994-10-19 KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. Dispositif pour supprimer les oscillations dans les engins de terrassement munis de roues
ATE150508T1 (de) * 1991-09-04 1997-04-15 Orenstein & Koppel Ag Hydraulisches schwingungsdämpfungssystem für mit arbeitsgeräten versehene arbeitsmaschinen
DE4221943C2 (de) * 1991-09-04 1996-01-25 Orenstein & Koppel Ag Hydraulikanlage für mit Arbeitsgeräten versehene fahrbare Arbeitsmaschinen
DE4129509C2 (de) * 1991-09-05 1994-06-16 Rexroth Mannesmann Gmbh Hydraulische Steueranordnung für Baumaschinen
DE19608758A1 (de) * 1996-03-07 1997-09-11 Rexroth Mannesmann Gmbh Hydraulische Ventilanordnung
US5992146A (en) * 1996-04-12 1999-11-30 Caterpillar Inc. Variable rate ride control system
DE19754828C2 (de) * 1997-12-10 1999-10-07 Mannesmann Rexroth Ag Hydraulische Steueranordnung für eine mobile Arbeitsmaschine, insbesondere für einen Radlader, zur Dämpfung von Nickschwingungen
JP2002117539A (ja) * 2000-10-10 2002-04-19 Tdk Corp 光記録媒体
US6382326B1 (en) * 2001-03-20 2002-05-07 Deere & Company Implement suspension with accumulator
DE10133616A1 (de) * 2001-07-13 2003-01-30 Bosch Rexroth Ag Hydraulische Steueranordnung
DE10227966A1 (de) * 2002-06-22 2004-01-08 Deere & Company, Moline Hydraulische Steueranordnung für eine mobile Arbeitsmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2090811A (en) * 1981-01-09 1982-07-21 Dresser Ind Hydraulic cylinder control system
US4522109A (en) * 1983-11-21 1985-06-11 J. I. Case Company Leak-detecting hydraulic system
JPS63265023A (ja) * 1987-04-20 1988-11-01 Kobe Steel Ltd 車両系建設機械の振動抑制装置
WO1990005814A1 (fr) * 1988-11-23 1990-05-31 A & T Hansson Konsult Ab Dispositif amortisseur de chocs pour machine mobile
EP1157963A2 (fr) * 2000-05-25 2001-11-28 J.C. Bamford Excavators Limited Système hydraulique pour un véhicule chargeur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 060 (M - 796) 10 February 1989 (1989-02-10) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1914353A3 (fr) * 2006-10-19 2011-04-20 Hitachi Construction Machinery Co., Ltd. Engin de construction
US8204655B2 (en) 2006-10-19 2012-06-19 Hitachi Construction Machinery Co., Ltd. Construction machine
FR2923352A1 (fr) * 2007-11-12 2009-05-15 Signalisation Moderne Autorout Machine de fauchage/debroussaillage/elagage munie d'un moyen d'amortissement de chocs
CN105229242A (zh) * 2013-05-13 2016-01-06 卡特彼勒公司 用于作业机器液压回路的阀装置
EP3943440A1 (fr) * 2020-07-21 2022-01-26 Liebherr-Werk Nenzing GmbH Système hydraulique pour un support de chute en arrière et appareil de travail
US11427987B2 (en) 2020-07-21 2022-08-30 Liebherr-Werk Nenzing Gmbh Hydraulic system for a fall-back support and work machine

Also Published As

Publication number Publication date
US7140178B2 (en) 2006-11-28
US20050198949A1 (en) 2005-09-15
DE102004012362A1 (de) 2005-09-22
DE502005001155D1 (de) 2007-09-20
CA2500627A1 (fr) 2005-09-13
EP1574626B1 (fr) 2007-08-08
ES2289652T3 (es) 2008-02-01
CA2500627C (fr) 2008-08-12
AU2005201082A1 (en) 2005-09-29
AU2005201082B2 (en) 2010-07-22
NZ538731A (en) 2006-02-24

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