EP0759109A1 - Systeme hydraulique pour engin de chantier mobile, notamment un chargeur a roues - Google Patents

Systeme hydraulique pour engin de chantier mobile, notamment un chargeur a roues

Info

Publication number
EP0759109A1
EP0759109A1 EP95917954A EP95917954A EP0759109A1 EP 0759109 A1 EP0759109 A1 EP 0759109A1 EP 95917954 A EP95917954 A EP 95917954A EP 95917954 A EP95917954 A EP 95917954A EP 0759109 A1 EP0759109 A1 EP 0759109A1
Authority
EP
European Patent Office
Prior art keywords
valve
hydraulic
directional
pressure
tank
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
EP95917954A
Other languages
German (de)
English (en)
Other versions
EP0759109B1 (fr
Inventor
Edwin Harnischfeger
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.)
Bosch Rexroth AG
Original Assignee
Mannesmann Rexroth AG
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 Mannesmann Rexroth AG filed Critical Mannesmann Rexroth AG
Publication of EP0759109A1 publication Critical patent/EP0759109A1/fr
Application granted granted Critical
Publication of EP0759109B1 publication Critical patent/EP0759109B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2271—Actuators and supports therefor and protection therefor

Definitions

  • the invention is based on a hydraulic system which is used for a mobile working device, in particular for a wheel loader, and which has the features from the preamble of claim 1.
  • a hydraulic control arrangement of a wheel loader includes, as is also shown in DE 39 09 205 Cl, a plurality of directional control valves, one of which serves to supply the lifting cylinders with pressure means for lifting and lowering the loading shovel. According to DE 39 09 205 Cl, this directional valve also has a switch position in which the two pressure chambers of each lift cylinder are connected to the tank.
  • the loader shovel In this switching position of the directional control valve, the loader shovel lies on the ground with its weight and can be pulled or pushed over it for leveling. It floats on the ground, so to speak, which is why the switching position of the directional valve in question is also referred to as the "swimming" switching position.
  • the "swimming" function as can be gathered from DE 41 29 509 AI, can also be implemented by an additional directional control valve the one that connects the two pressure chambers of each lift cylinder to one another and to the tank in a switch position.
  • the invention has for its object to develop a hydraulic control arrangement with the features from the preamble of claim 1 so that a compact and space-saving design is possible, that the piping is reduced and that the production can be inexpensive.
  • a hydraulic system which has the features from the preamble of claim 1 and in which, according to the characterizing part of this claim, the shut-off valve is inserted into the directional control valve via which the two pressure chambers of the hydraulic cylinder are separated with " If pressure can be applied and / or can be connected together with the tank, it is integrated that the hydraulic accumulator and the first pressure chamber of the hydraulic cylinder can be connected to one another via the control slide of the directional control valve
  • One of the directional valves also fulfills the function of the shut-off valve, which means that the piping is less expensive, the construction is compact and space-saving, and the costs are reduced.
  • the second pressure chamber is simultaneously connected to the tank. This means that no negative pressure can develop in the second pressure chamber and the piston of the hydraulic cylinder can oscillate without cavitation.
  • a first directional valve via which the two pressure chambers of the hydraulic cylinder can be connected alternately to a hydraulic pump and to the tank, and a second directional control valve, via which the two pressure rooms together with can be connected to the tank, so that the "swimming" function can be implemented.
  • the shut-off valve is now advantageously integrated into the second directional valve, because then no fourth switching position is necessary for the first directional valve.
  • connection of the first pressure chamber of the hydraulic cylinder to the hydraulic accumulator can be established by actuating the second directional valve. If you disregard a possible pilot valve for the second directional valve, you do not have to: ⁇ : this directional valve, no further directional valve for the "damping" function of the hydraulic system must be operated.
  • valve housings of essentially the same design are used.
  • a first directional valve 10 and a second directional valve 11 can be seen, which form directly adjacent sections of a valve block 12, to which further directional valve sections, not shown, belong.
  • the directional control valve 10 serves to actuate two lift cylinders connected in parallel with one another and to raise and lower the loading shovel of a wheel loader via them.
  • Each lift cylinder 13 contains in a cylinder housing 14 a piston 15 having a piston rod 16, which divides the interior of the housing 14 into an annular pressure chamber 17 on the piston rod side and into a pressure chamber 18 away from the piston rod.
  • the piston rod-side pressure chambers 17 of the lift cylinder 13 are connected via a consumer line 19 to a first connection 20 of the directional control valve 10.
  • the pressure chambers 18 are connected via a line 21 to a connection 21 of the directional valve 10.
  • This directional control valve 10 has a valve housing 25, through which a pressure channel 26, which is connected to the pressure connection of a hydraulic pump 27, and a tank channel 28, which opens into a tank 29, pass through in the direction of the alignment with the directional control valve 11.
  • the opening cross sections of these two channels are not influenced by the position of the control slide 30 of the directional valve 10.
  • a further channel 31 passing through the valve housing 25 is referred to as a circulation channel, which is open in a central position of the control slide 30 and when the control slide 30 is displaced from the spring-centered central position in one or the other direction is closed more and more for complete isolation.
  • the circulation channel 31 also leads through the other directional valve sections of the valve block 12 arranged on the side of the section 10 remote from the directional valve section 11, can be influenced by the control slide of the further directional valve sections as well as through the control slide 30 and is ultimately connected to the pressure channel 26.
  • the control slide 30 When the control slide 30 is moved out of the central position, the connection 21 is connected to the pressure channel 26 and the connection 20 to the tank channel 28. As a result, the pressure spaces 18 are pressurized and the pressure spaces 17 to the tank are relieved.
  • the piston rods 16 extend, the loading shovel of the wheel loader is raised.
  • the control slide 30 is moved in the opposite direction, the pressure spaces 17 are pressurized and the pressure spaces 18 are relieved of pressure to the tank.
  • the loading display lowers.
  • the housing 35 of the directional control valve 11 is largely identical to the housing 25 of the directional control valve 10. It has a channel 36 in the extension of the pressure channel 26 of the valve 10, a tank channel 38 in the extension of the tank channel 28 and a continuous circulation channel 41, which continues the circulation channel 31 of the directional control valve 10.
  • the circulation channel 41 is connected to the tank channel 38 in every position of the control slide 40 of the directional control valve 11, so that it is also possible to establish a permanent connection between the circulation channel 31 and the To produce tank channel 28 in the housing 25 of the directional control valve 10 and to dispense with a circulation channel in the housing 35 of the directional control valve 11.
  • the tank channels 28 and 38 are namely open to one another.
  • the channel 36 of the valve housing 35 to the pressure channel 26 of the valve housing 25 is shut off.
  • This shut-off can already be provided in the casting mold for the valve housing 35, but can also only be carried out subsequently.
  • the channel 36 is open to the side of the valve housing 35 facing away from the directional control valve 10. It is connected to a hydraulic accumulator 42.
  • the directional control valve 11 has two consumer connections 20 and 21, the consumer connection 20 like the corresponding connection of the directional control valve 10 with the pressure spaces 17 and the consumer connection 21 as the corresponding connection of the directional control valve 10 with the pressure spaces 18 of the Lift cylinder 13 is connected.
  • the two consumer connections 20 and 21 and the channels 36 and 38 are shut off from one another.
  • the consumer connections 20 and 21 are connected to the channel 38 and thus to the tank 29, while the channel 36 is closed.
  • the lift cylinder 13 tank pressure prevails in both pressure chambers 17 and 18.
  • the loader bucket of a wheel loader can be pulled over the ground to level it.
  • the “swimming” function is thus realized by the corresponding actuation of the control slide 40.
  • the connection 20 of the directional valve 11 is connected to the channel 38, that is to say the tank 29, and the connection 21 to the channel 36, that is to say to the hydraulic accumulator 42.
  • the pressure spaces 17 of the lift cylinders 13 are thereby relieved of the load to the tank, while the pressure spaces 18 are connected to the hydraulic accumulator 42. Oil can therefore be pushed back and forth between the pressure chambers 18 and the hydraulic accumulator 42, so that the boom of the wheel loader with the loading shovel and the loader itself no longer form a rigid system and pitching vibrations are damped.
  • the "damping" function is thus realized by the further lateral position of the control slide 40.
  • the control slide 40 is shifted into this position either arbitrarily by the vehicle driver or automatically when the wheel loader has reached a certain driving speed.
  • An electromagnetically actuable pilot valve 50 is then actuated and a control pressure chamber 51 of the directional control valve 11, which is relieved to the tank in the rest position of the valve 50, is connected to a line 52 which is dependent on the maximum control pressure required for actuating the directional control valves of the block 12 is available, is acted upon.
  • the accumulator 42 can be charged up to an adjustable maximum pressure via an filling valve arrangement 60 and is connected to the pressure chambers 18 of the lift cylinders 13 via the filling valve arrangement 60.
  • this is done in that the valve arrangement 60 within the valve housing 35 of the directional valve 11 is connected to a channel leading to the connection 21 of this valve.
  • the connection could, however, also take place outside the valve housing 35 or inside the housing 25.
  • the valve arrangement 60 comprises a pressure reducing valve 61 and a check valve 62 which is connected between the pressure reducing valve and the hydraulic accumulator 42 and opens towards the hydraulic accumulator.
  • the hydraulic accumulator 42 is filled via the valves 61 and 62 up to the pressure prevailing in the pressure chambers 18, provided that this pressure does not exceed a value set on the pressure reducing valve ⁇ tet.
  • the pressure in the pressure chambers 18 usually remains below the set value, so that the maximum pressure that prevails in the hydraulic accumulator 42 is maintained in the hydraulic accumulator by the check valve 62.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

L'invention part d'un système hydraulique pour engin de chantier mobile, notamment un chargeur à roues, ce système hydraulique étant équipé de la fonction 'amortissement des oscillations longitudinales'. Conformément à un système hydraulique connu de ce type, le système hydraulique décrit comporte au moins un vérin hydraulique (13) avec lequel un outil peut être actionné et dont l'espace intérieur est divisé par un piston (15) en deux chambres de pression (17, 18); une soupape d'arrêt (12) qui raccorde l'une des deux chambres de pression (17, 18) à un réservoir hydraulique (42) pouvant être rempli par l'intermédiaire d'un tuyau de remplissage; et un distributeur (11) avec un tiroir (40) pour la mise en pression séparée des deux chambres de pression (17, 18) dans le vérin hydraulique (13) et/ou pour les raccorder à un réservoir (29). Pour rendre un tel système compact et peu onéreux, la soupape d'arrêt est incorporée dans le distributeur (11) de telle manière que le réservoir hydraulique (42) et la première chambre de pression (17) du vérin hydraulique (13) peuvent être raccordés l'un à l'autre par l'intermédiaire du tiroir (40) du distributeur (11).
EP95917954A 1994-05-07 1995-04-25 Systeme hydraulique pour engin de chantier mobile, notamment un chargeur a roues Expired - Lifetime EP0759109B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4416228A DE4416228A1 (de) 1994-05-07 1994-05-07 Hydraulische Anlage für ein mobiles Arbeitsgerät, insbesondere für einen Radlader
DE4416228 1994-05-07
PCT/EP1995/001556 WO1995030800A1 (fr) 1994-05-07 1995-04-25 Systeme hydraulique pour engin de chantier mobile, notamment un chargeur a roues

Publications (2)

Publication Number Publication Date
EP0759109A1 true EP0759109A1 (fr) 1997-02-26
EP0759109B1 EP0759109B1 (fr) 1999-01-13

Family

ID=6517607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95917954A Expired - Lifetime EP0759109B1 (fr) 1994-05-07 1995-04-25 Systeme hydraulique pour engin de chantier mobile, notamment un chargeur a roues

Country Status (6)

Country Link
US (1) US5802847A (fr)
EP (1) EP0759109B1 (fr)
JP (1) JPH09512869A (fr)
KR (1) KR970702951A (fr)
DE (2) DE4416228A1 (fr)
WO (1) WO1995030800A1 (fr)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19609787A1 (de) * 1996-03-13 1997-09-18 Bosch Gmbh Robert Hydrauliknotsteuerung für ein stufenloses Umschlingungsgetriebe mit erweitertem Handschaltventil
US5733095A (en) * 1996-10-01 1998-03-31 Caterpillar Inc. Ride control system
DE19711769C2 (de) * 1997-03-21 1999-06-02 Mannesmann Rexroth Ag Hydraulische Steueranordnung für eine mobile Arbeitsmaschine insbesondere für einen Radlader
DE19734658A1 (de) * 1997-08-11 1999-02-18 Mannesmann Rexroth Ag Hydraulische Steueranordnung für eine mobile Arbeitsmaschine, insbesondere für einen Radlader
DE19751357B4 (de) * 1997-11-20 2007-01-25 Bosch Rexroth Aktiengesellschaft Hydraulische Steueranordnung für eine mobile Arbeitsmaschine, insbesondere für einen Radlader, zur Dämpfung von Nickschwingungen
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
DE19823347A1 (de) * 1998-05-13 1999-11-18 Claas Ohg Einrichtung zur Steuerung und Einstellung von Arbeitszylindern
JP3622142B2 (ja) * 1999-08-04 2005-02-23 新キャタピラー三菱株式会社 作業機械の作業腕制御装置
US6357230B1 (en) * 1999-12-16 2002-03-19 Caterpillar Inc. Hydraulic ride control system
DE10133616A1 (de) * 2001-07-13 2003-01-30 Bosch Rexroth Ag Hydraulische Steueranordnung
US6655136B2 (en) 2001-12-21 2003-12-02 Caterpillar Inc System and method for accumulating hydraulic fluid
US6843489B2 (en) 2002-02-13 2005-01-18 Caterpillar Inc. Axle damping system and method
WO2005035883A1 (fr) * 2003-10-10 2005-04-21 Komatsu Ltd. Dispositif de suppression de vibrations de deplacement pour vehicule de travail
DE10354959A1 (de) 2003-11-25 2005-06-30 Bosch Rexroth Ag Hydraulische Steueranordnung für ein mobiles Arbeitsgerät
DE102004012945A1 (de) * 2004-03-17 2005-10-13 Cnh Baumaschinen Gmbh Vorrichtung und Verfahren zur Bewegungstilgung bei Baumaschinen
US7621124B2 (en) 2004-10-07 2009-11-24 Komatsu Ltd. Travel vibration suppressing device for working vehicle
JP4685417B2 (ja) * 2004-11-16 2011-05-18 日立建機株式会社 作業車両用液圧制御装置
EP1964982A1 (fr) * 2007-03-01 2008-09-03 Caterpillar, Inc. Système fluidique et méthode l'utilisant.
US20090057045A1 (en) * 2007-08-29 2009-03-05 Cnh America Llc Hydraulic system to deter lift arm chatter
US9175456B2 (en) * 2010-06-22 2015-11-03 Hitachi Construction Machinery Co., Ltd. Hydraulic control device for working vehicle
US8858151B2 (en) * 2011-08-16 2014-10-14 Caterpillar Inc. Machine having hydraulically actuated implement system with down force control, and method
US10151080B2 (en) 2015-11-30 2018-12-11 The Charles Machine Works, Inc. Valve assembly for work attachment
JP6858629B2 (ja) * 2017-04-27 2021-04-14 川崎重工業株式会社 制振制御回路
US11781573B2 (en) * 2020-07-23 2023-10-10 Parker-Hannifin Corporation System, valve assembly, and methods for oscillation control of a hydraulic machine
JP2024126890A (ja) * 2023-03-08 2024-09-20 株式会社小松製作所 作業機械、作業機械の制御方法及び制御弁装置

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Also Published As

Publication number Publication date
DE4416228A1 (de) 1995-11-09
JPH09512869A (ja) 1997-12-22
WO1995030800A1 (fr) 1995-11-16
DE59504825D1 (de) 1999-02-25
US5802847A (en) 1998-09-08
EP0759109B1 (fr) 1999-01-13
KR970702951A (ko) 1997-06-10

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