WO2004104427A1 - Systeme hydraulique pour engin de travaux - Google Patents

Systeme hydraulique pour engin de travaux Download PDF

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Publication number
WO2004104427A1
WO2004104427A1 PCT/SE2004/000807 SE2004000807W WO2004104427A1 WO 2004104427 A1 WO2004104427 A1 WO 2004104427A1 SE 2004000807 W SE2004000807 W SE 2004000807W WO 2004104427 A1 WO2004104427 A1 WO 2004104427A1
Authority
WO
WIPO (PCT)
Prior art keywords
accumulator
hydraulic
valve
valve housing
tubular member
Prior art date
Application number
PCT/SE2004/000807
Other languages
English (en)
Inventor
Bertil Lundgren
Original Assignee
Nordhydraulic Ab
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 Nordhydraulic Ab filed Critical Nordhydraulic Ab
Publication of WO2004104427A1 publication Critical patent/WO2004104427A1/fr

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
    • E02F9/2217—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
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/005—Leakage; Spillage; Hose burst

Definitions

  • This invention relates generally to hydraulic systems for work machines, especially hydraulically operated material-handling machines, such as tractor-mounted front loaders, and more particularly to a hydraulic system which comprises a flow control valve and a hydraulic accumulator.
  • the invention also relates to a flow control valve for a hydraulic system of that kind.
  • a front loader is a work machine comprising a lift boom which is pivotally mounted on an engine-driven vehicle, typically a tractor, and carries a working implement, typically a loader bucket, in front of the vehicle.
  • the lift boom comprises a pair of parallel lift arms, one on each side of the vehicle, and is movable up and down about a horizontal pivot axis by means of one or more hydraulic cylinders.
  • One or more additional hydraulic cy- linders are provided for manipulation of the working implement, such as for tilting a bucket about a horizontal axis at the front end of the lift boom.
  • An operator controls the movements of the lift boom and the working implement by means of hydraulic directional flow control valves connected to the hydraulic cylinders.
  • U.S. Patent No. 4 904 151 and U.S. Patent No. 5 611 657 show examples of front loaders.
  • Front loaders are often designed as a unit, including the hydraulic cylinders and their associated hydraulic fluid lines, which can easily be connected to and disconnected from the vehicle.
  • the lift boom and the hydraulic fluid lines of the cylinders are provided with quick- connect coupling members which can easily be engaged with and disengaged from counterpart coupling members on the vehicle.
  • the hydraulic system of many front loaders comprises, in addition to the directional control valves used by the operator to control the movements of the lift boom and the normal or most frequent movements of the working implement, such as the tilting movements of a loader bucket, a further directional flow control valve, herein referred to as a selector valve, which can be operated to direct hydraulic fluid to an additional or alternative function, that is, to an additional hydraulic actuator used for example to perform an additional or alternative manipulation of the working implement.
  • the selector valve is mounted on the front loader, commonly on a transverse tubular member secured between the lift arms of the lift boom to stabilize them.
  • the hydraulic system also comprises at least one hydraulic accumulator which communicates with the part of the hydraulic system which includes the lift boom cylinders.
  • This accumulator can serve as a shock absorber for the lift boom while the vehicle is travelling.
  • the hydraulic accumulator is a vessel the interior of which is under a very high pressure, such as 100 to 300 bar, when the hydraulic system operates. For that reason, the accumulator should be positioned such that it is protected from mechanical shocks or other violent events which may damage it and possibly cause it to burst under the internal pressure with consequential risk of injury to the operator or other persons, or of damage to parts of the vehicle or the work machine.
  • An object of the invention is to provide for a simple and inexpensive mounting of the selector valve and the accumulator (s) in a manner that also ensures effective protection of the accumulator(s) from events which may result in dangerous mechanical damage to the accumulator(s).
  • Another object of the invention is to provide a hydraulic directional flow control valve which lends itself to mounting it on a hydraulically operated work machine, such as a front loader, and which can be directly mechanically connected with one or more hydraulic accumulators which are sepa- rated from the valve by a mechanical protective member enclosing the accumulator or accumulators.
  • a hydraulic system for a work machine comprising a flow control valve having a valve housing with an internal passageway system for conveying hydraulic fluid through the valve, line ports for connecting hydraulic fluid lines to said internal passageway system, and an accumulator connection point for connecting a hydraulic accumulator to said internal passageway system, and an open-ended tubular member capable of accommodating the accumulator, wherein the valve housing is provided on an outer face thereof with an external projection forming an accumulator support having an accumulator port which is in fluid communication with said internal passage- way system, the accumulator being connectable to said accumulator port, and wherein the valve housing is mounted on the outer side of said tubular member with said accumulator support extending through the wall of the tubular member to position the accumulator port inside the tubular member.
  • the tubular member on the outer side of which the valve housing is mounted may advantageously be a structural element of the lift boom of a loader, such as a tubular structural element secured between laterally spaced-apart lift arms of a lift boom to stabilize the lift boom. Since such a structural element is normally present on the lift boom in any case, a modification of the lift boom is not required, apart from making an opening in the tubular member for the passage of the accumulator support and elements required of the fastening of the valve housing to the tubular member.
  • a hydraulic flow control valve comprising a valve housing with an internal passageway system for conveying hydraulic fluid through the valve, line ports for connecting hydraulic lines (L) to said internal passageway system, and an accumulator support which projects from the valve housing and has a distal end provided with at least one accumulator port for connecting at least one hydraulic accumulator to the valve, the accumulator support being provided with an internal passageway which connects the accumulator port to other parts of said internal passageway system, wherein the line ports are provided on opposite faces of the valve housing and the accumulator support is provided on a valve mounting face of the valve housing extending between said opposite faces of the valve housing, and wherein said opposite faces of the valve housing are provided with at least one lug adapted to receive a fastening element for securing the valve housing to a valve support member with the accumulator support extending into said valve support member.
  • This flow control valve can advantageously be used in the hydraulic system according to the invention.
  • FIG. 1 is a perspective view of a work machine, namely a front loader having a lift boom which is pivotally mounted on a pair of upright posts and supports a bucket;
  • Fig. 2 is a fractional plan view of the front loader shown in Fig. 1, a portion of a tubular structural component of the loader lift boom being broke away to show an accumulator support and a pair of hydraulic accumulators more clearly;
  • Fig. 3 is a perspective view of a flow control selector valve according to the invention with associated hydraulic lines and the pair of hydraulic accumulators, the tubular member accommodating the accumulators being omitted;
  • Fig. 4 is a partly sectional view from line IV-IV in Fig. 2;
  • Fig. 5 is a perspective view of the selector valve housing
  • Fig. 6 shows a hydraulic circuit of the front loader with associated hydraulic cylinders of the lift boom.
  • Fig. 1 The work machine diagrammatically shown in Fig. 1 is a front loader 10 adapted to be supported by an engine-driven vehicle, such as a farm- type tractor (not shown), on a pair of posts 11 mounted on opposite sides of the vehicle.
  • a lift boom 12 extends forwardly on the vehicle and has its rear end mounted on the posts 11 for pivotal movement up and down about a horizontal axis C.
  • a pair of parallel, laterally spaced-apart lift arms 12A of the boom 12 are rigidly held together and stabilised by an open-ended transverse tubular member 13 which extends between the lift arms 12A sufficiently far from the pivot axis C to avoid interference with the body of the vehicle when the boom 12 is pivoted up and down.
  • the tubular member 13 which is generally square in cross- section.
  • the tubular member 13 is welded to the lift arms 12A to stabilise them in a well-known manner and thus is a structural element of the lift boom 12.
  • a pair of double-acting hydraulic cylinders 14 are connected between the posts 11 and the lift boom 12 to move the boom 12 up and down under operator control by means of an associated directional control valve (not shown) in a well-known manner.
  • a work implement in the form of a bucket 15 is mounted on the forward end of the lift boom 12.
  • the bucket 15 is pivotable about a horizontal axis by means of one or two double-acting hydraulic cylinders 16 (shown in Fig. 6) under operator control by means of an associated directional control valve (not shown), likewise in a well-known manner.
  • a selector valve 17 Mounted on one side of the tubular member 13, the rear side as viewed in Fig. 1 and the right side as viewed in Fig. 4, is another hydraulic flow control valve, a selector valve 17. As best shown in Figs. 2 to 4, several hydraulic lines collectively designated by L are connected to line ports P on opposite sides of the housing 18 of the selector valve 17.
  • lines L connect the selector valve 17 to, on the one hand, components of the hydraulic system associated with the front loader 10 which are disposed on the vehicle and thus not shown, namely a source of pressurised hydraulic fluid, including a pump and a reservoir, and the operator-controlled flow control valves used to control the operation of the lift boom 12 and the bucket 15, and, on the other hand, components of that system which are disposed on the front loader 10, namely the hydraulic cylinders 14 and 16 and a pair of hydraulic accumulators 19.
  • Figs. 2 to 5 show in greater detail the tubular member 13 and the selector valve 17 with its line ports P and hydraulic lines L.
  • this passageway system is diagrammatically shown in broken lines in Figs. 2 and 4 where it is generally designated by S - the hydraulic fluid can be passed into and out of the selector valve 17.
  • a valve spool inside the housing 18 of the selector valve 17 can be displaced by means of an electrically actuated pilot valve 20 to control the flow through the selector valve as will be described below with reference to the hydraulic circuit shown in Fig. 6.
  • the detailed design of the passageway system S, the valve spool and the pilot valve 20 may be conventional.
  • One side 18A of the housing 18 is integrally formed with a rodlike project- tion or horn 21, the free or distal end of which is formed with a pair of accumulator ports 22.
  • These ports 22 communicate with a passageway SI (Fig. 2) which forms part of the passageway system S and extends through the horn 21 into the main body of the housing 18 where it is connected with the other passageways of the system S.
  • the horn 21 with its accumulator ports 22 forms a mount or support for the hydraulic accumulators 19 and enables the accumulators to communicate with the internal passageway system S of the selector valve 17.
  • a branch of the passageway SI can be shut off by means of a manually actuated shut-off valve 23 to isolate one of the accumulators 19 from the passageway system S, and thus from the entire hydraulic system of the front loader 10, if desired.
  • the hydraulic accumulators 19 which are conventional, define an internal gas-filled closed space which a flexible diaphragm separates from an ad- joining space which holds a smaller or larger volume of hydraulic fluid, depending on the pressure of the hydraulic fluid. They are connected to the ports 22 via an externally threaded neck that is screwed into the ports.
  • the housing 18 of the selector valve 17 is bolted to the outer side of the tubular member 13 by means of a couple of bolts 24 such that a flat outer mounting face, formed by the housing side 18A provided with the horn 21, firmly engages the tubular member.
  • the housing 18 is provided with a pair of lugs 25 on opposite housing sides 18B. These lugs 25 are formed with recesses for accommodating the shanks of the bolts 24 and supporting the bolt heads. Mounting of the housing 18 on the tubular member 13 is carried out with the accumulators 19 disconnected from the ports 22.
  • the horn 21 is first passed through an opening in the tubular member 13 whereupon the housing 18 is secured by means of the bolts 24 and the accumulators 19 are inserted through the ends of the tubular member and screwed into the ports 22. Since the sides 18B of the housing 18 are generally perpendicular to the mounting face of the housing 18 and to the tubular member 13, the ports P are conveniently accessible for connection of the hydraulic lines L which can be secured along the tubular member.
  • Fig. 5 shows the housing 18 of the selector valve 18 provided with a cover plate 18C at the housing end where the pilot valve 20 is connectable.
  • a plug 23A closes a housing opening where the shut-off valve 23 is mounted when it is used.
  • Fig. 6 shows the lift boom 12, somewhat modified over the lift boom shown in Fig. 1, and the lift cylinders 14 and bucket cylinders 16 incorporated in a hydraulic circuit diagram which also includes the selector valve 17, the pilot valve 20, the shut-off valve 23 and the hydraulic accumulators 19.
  • the ports P provided on the opposite sides 18B of the valve housing 18 form seven port pairs PI to P7.
  • Port pairs PI and P2 communicate with the hydraulic fluid source (not shown) through their respective above- mentioned directional control valves, that is, a control valve connected to port pair PI for controlling the movements of the lift cylinders 14 via port pairs P3 and P4, and a control valve for controlling the movements of the bucket cylinders 16 via port pairs P5 and P6.
  • Port pair P7 (shown only in Fig.
  • 6) is not used in the illustrated embodiment but may be used for an alternative function, such as for the operation of a gripper implement or a rotator, which can be selected by means of the selector valve 17 by shifting the two-position spool of that valve to its alternative position.

Landscapes

  • 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)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

Système hydraulique conçu pour un engin de travaux, tel qu'un chargeur frontal monté sur un tracteur, et comprenant une vanne de régulation de débit (17) possédant un carter de vanne (18) pourvu d'un système de passage interne (S) servant à véhiculer le liquide hydraulique à travers la vanne, des orifices servant à relier les conduits de liquide hydraulique (L) au système de passage (S) et un point de raccordement d'accumulateur (22) servant à accoupler un accumulateur hydraulique (19) au système de passage (S). Ce système hydraulique comporte également un élément tubulaire (13) à extrémités ouvertes capable de loger l'accumulateur (19). Une face extérieure du carter de vanne (18) est fixée au côté extérieur de l'élément tubulaire (13) et possède un support saillant (21) dans lequel est situé l'orifice (22) de l'accumulateur. Ce support d'accumulateur (21) s'étend à travers la paroi de l'élément tubulaire (13), de manière à positionner l'orifice d'accumulateur (22) à l'intérieur de cet élément tubulaire.
PCT/SE2004/000807 2003-05-26 2004-05-26 Systeme hydraulique pour engin de travaux WO2004104427A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0301542-7 2003-05-26
SE0301542A SE526232C2 (sv) 2003-05-26 2003-05-26 Ventil samt tryckfluidanläggning för manövrering av en arbetsmaskin, vilken anläggning innefattar en sådan ventil

Publications (1)

Publication Number Publication Date
WO2004104427A1 true WO2004104427A1 (fr) 2004-12-02

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PCT/SE2004/000807 WO2004104427A1 (fr) 2003-05-26 2004-05-26 Systeme hydraulique pour engin de travaux

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SE (1) SE526232C2 (fr)
WO (1) WO2004104427A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1683754A1 (fr) 2005-01-21 2006-07-26 Hydrokit Engin roulant du type muni d'un bras comportant un dispositif d'amortissement du bras
WO2012095577A1 (fr) * 2011-01-14 2012-07-19 Peugeot Citroen Automobiles Sa Systeme d'accumulation de pression hydraulique
WO2023180619A1 (fr) * 2022-03-23 2023-09-28 Aw-Energy Oy Arrangement de bâti d'accumulateur hydraulique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2095001A (en) * 1981-03-11 1982-09-22 Lucas Industries Ltd Improvements in control valves for vehicle hydraulic systems
DE19534053A1 (de) * 1995-09-14 1997-03-27 Hydac System Gmbh Sicherungsvorrichtung vor Beschußschäden

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2095001A (en) * 1981-03-11 1982-09-22 Lucas Industries Ltd Improvements in control valves for vehicle hydraulic systems
DE19534053A1 (de) * 1995-09-14 1997-03-27 Hydac System Gmbh Sicherungsvorrichtung vor Beschußschäden

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1683754A1 (fr) 2005-01-21 2006-07-26 Hydrokit Engin roulant du type muni d'un bras comportant un dispositif d'amortissement du bras
FR2881126A1 (fr) * 2005-01-21 2006-07-28 Hydrokit Soc Par Actions Simpl Engin roulant du type muni d'un bras, comportant un dispositif d'amortissement du bras.
WO2012095577A1 (fr) * 2011-01-14 2012-07-19 Peugeot Citroen Automobiles Sa Systeme d'accumulation de pression hydraulique
FR2970527A1 (fr) * 2011-01-14 2012-07-20 Peugeot Citroen Automobiles Sa Systeme d'accumulation de pression hydraulique
WO2023180619A1 (fr) * 2022-03-23 2023-09-28 Aw-Energy Oy Arrangement de bâti d'accumulateur hydraulique

Also Published As

Publication number Publication date
SE0301542L (sv) 2004-11-27
SE526232C2 (sv) 2005-08-02
SE0301542D0 (sv) 2003-05-26

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