EP0776426A1 - Hydraulische steuervorrichtung für einen doppelt wirkenden zylinder - Google Patents

Hydraulische steuervorrichtung für einen doppelt wirkenden zylinder

Info

Publication number
EP0776426A1
EP0776426A1 EP94928429A EP94928429A EP0776426A1 EP 0776426 A1 EP0776426 A1 EP 0776426A1 EP 94928429 A EP94928429 A EP 94928429A EP 94928429 A EP94928429 A EP 94928429A EP 0776426 A1 EP0776426 A1 EP 0776426A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
valve
hydraulic
conduit
oil
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
EP94928429A
Other languages
English (en)
French (fr)
Other versions
EP0776426B1 (de
Inventor
Alain Bourgeois
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0776426A1 publication Critical patent/EP0776426A1/de
Application granted granted Critical
Publication of EP0776426B1 publication Critical patent/EP0776426B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005—With rotary or crank input
    • F15B7/006—Rotary pump input
    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/008—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors with rotary output

Definitions

  • the present invention relates to a hydraulic control device for a double-acting cylinder.
  • Double-acting hydraulic cylinders are generally supplied with pressurized oil by an electro-hydraulic unit to which is added an oil distribution block comprising a hydraulic distributor or a set of valves controlling the operation of the cylinder in both directions, especially in the case of differential operation.
  • the hydraulic cylinder is mounted in the immediate vicinity of the element whose movement it is to cause and it is connected, by flexible or rigid pipes, to the distribution block located at a distance, generally in the immediate vicinity of the electro-hydraulic unit.
  • Such a hydraulic supply device has the disadvantage that, if the supply pipes of the jack are flexible, these pipes can break, the pressurized oil can leak out from the broken pipes, the jack is then no longer supplied and the load actuated by the jack is no longer maintained.
  • the hydraulic connection circuit between the jack and the distribution block associated with the electro-hydraulic unit consists of rigid pipes
  • the kinematics of the mobile assembly controlled by the jack must take account of the increase in size due the presence of the electro-hydraulic unit near the cylinder.
  • the use of rigid pipes does not prevent any leaks from the distributor, which always appear when using a conventional drawer distributor.
  • the present invention aims to remedy these drawbacks by providing a supply device hydraulics of particularly simple design, of a reduced size, effectively protecting, by design, the cylinder against bursting of the piping supplying it with oil under pressure or against a leak of the distributor.
  • this hydraulic supply device for a double-acting cylinder comprising an electro-hydraulic unit supplying pressurized oil to the cylinder via a pipe and a distribution block
  • the distribution block fixed to the body of the jack, directly or in the immediate vicinity thereof, by means of rigid connecting members, comprises: a non-return valve connected upstream to a supply pipe extending to the electro-hydraulic unit and, downstream, to the right chamber of the hydraulic cylinder, by an internal conduit to said block, said valve preventing any return of oil to the unit, or to the outside in case supply pipe rupture
  • This cylinder 1 comprises a cylindrical body 2 inside which is slidably mounted a piston 3 integral with a piston rod 4 extending axially outside, through one end of the body 2 of the jack, to control the movement of a any load.
  • the piston 3 delimits, inside the body 2 of the jack, two chambers, namely a straight chamber 2a . in which extends the piston rod 4, and a left chamber 2jb.
  • the jack 1 is supplied with pressurized oil from an electro-hydraulic unit 5 comprising, in the usual manner, an oil pump 6 driven by an electric motor 7 and the suction port of which is connected, by the by means of a pipe to which a filter 8 is connected, to an oil tank 9.
  • the electro-hydraulic unit 5 also includes a pipe 11 for returning oil to the tank 9.
  • the circulation of the oil supplying the cylinder 1 is controlled by a distribution block 12 which is secured directly to the body 2 of the cylinder 1 or else in the immediate vicinity thereof, by means of organs. rigid connection 10.
  • This distribution block 12 comprises:
  • a first internal conduit 13 provided at one of its ends with a non-return valve 14, which is connected to the discharge port of the pump 6 via an external and flexible pipe 15, l 'other end of said conduit 13 directly supplying pressurized oil to the right chamber 2a. of the jack 1 on the one hand and, through a normally closed electromagnetic control valve 16, of the left chamber 2b of the jack 1 on the other hand, and
  • the operation of the hydraulic supply device of the jack 1 is as follows: to cause the re-entry of the rod, that is to say its displacement from right to left in the drawing, the pump 6 of the electro-hydraulic unit 5 is started, which discharges oil under pressure, through the non-return valve 14 of the distribution block 12, in the right chamber 2a. of the jack 1.
  • the excitation of the electromagnetic valve 18 which also passes into the open position is also controlled, the valve 16 remaining in its closed rest position.
  • the pressurized oil arriving through the pipe 15 and the internal conduit 13 can then gradually fill the right chamber 2a. of the jack 2, while the oil in the left chamber 2b of this jack can return to the reservoir 9 by passing through the valve 18, in the open position, the internal conduit 17 and the piping 11 returning to the reservoir 9.
  • valve 18 To cause the reverse movement, that is to say the exit of the piston rod 4, the valve 18 is kept in the closed position and the valve 16 is however excited to move it to the open position, which establishes communication between the two right chambers 2a. and left 2b of the jack 1.
  • the oil under pressure coming from the electro-hydraulic unit 5 flows through the non-return valve 14, into the internal conduit 13 and from the latter towards the two chambers 2a . , 2b_ of the cylinder 1.
  • the cylinder 1 is found to be protected by the non-return valve 14.
  • the oil contained in the two chambers 2a. , 2b of the jack 1 cannot in fact flow outwards, through the broken pipe 15, due to the presence of the non-return valve 14 which forms a hermetic barrier.
  • the distribution block 12 is protected from internal leaks unlike conventional distributors. The cylinder 1 cannot therefore empty its oil and this guarantees the operational safety of the cylinder 1, especially when it is used for moving heavy loads.
  • the device according to one or other of the variants of the invention is advantageously usable in the particular field of the tailgate, in particular for a vehicle for which until now there has never been any such safety device and protection in the event of rupture of the pressurized fluid supply pipes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
EP94928429A 1993-09-22 1994-09-22 Hydraulische steuervorrichtung für einen doppelt wirkenden zylinder Expired - Lifetime EP0776426B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9311276A FR2710372B1 (fr) 1993-09-22 1993-09-22 Dispositif de commande hydraulique d'un vérin à double effet.
FR9311276 1993-09-22
PCT/FR1994/001109 WO1995008715A1 (fr) 1993-09-22 1994-09-22 Dispositif de commande hydraulique d'un verin a double effet

Publications (2)

Publication Number Publication Date
EP0776426A1 true EP0776426A1 (de) 1997-06-04
EP0776426B1 EP0776426B1 (de) 1998-12-23

Family

ID=9451112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94928429A Expired - Lifetime EP0776426B1 (de) 1993-09-22 1994-09-22 Hydraulische steuervorrichtung für einen doppelt wirkenden zylinder

Country Status (5)

Country Link
EP (1) EP0776426B1 (de)
AU (1) AU7786094A (de)
DE (1) DE69415559D1 (de)
FR (1) FR2710372B1 (de)
WO (1) WO1995008715A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365407B (en) 2000-05-25 2003-10-08 Bamford Excavators Ltd Hydraulic system for wheeled loader
US7137450B2 (en) 2004-02-18 2006-11-21 Fmc Technologies, Inc. Electric-hydraulic power unit
US7159662B2 (en) 2004-02-18 2007-01-09 Fmc Technologies, Inc. System for controlling a hydraulic actuator, and methods of using same
US6998724B2 (en) 2004-02-18 2006-02-14 Fmc Technologies, Inc. Power generation system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953118A (en) * 1956-04-05 1960-09-20 Francis S Flick Port fitting
US4079988A (en) * 1977-02-28 1978-03-21 Peabody International Corporation Elevating tailgate
DE2950852A1 (de) * 1979-12-18 1981-09-24 Vereinigte Flugtechnische Werke Gmbh, 2800 Bremen Ladevorrichtung fuer lastfahrzeuge
DE4120170A1 (de) * 1991-06-19 1992-12-24 Bosch Gmbh Robert Druckmittelbetaetigbarer arbeitszylinder
DE9305980U1 (de) * 1993-04-20 1993-08-05 Leibfried Maschinenbau Gmbh, 71083 Herrenberg, De

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9508715A1 *

Also Published As

Publication number Publication date
FR2710372B1 (fr) 1995-11-17
EP0776426B1 (de) 1998-12-23
WO1995008715A1 (fr) 1995-03-30
AU7786094A (en) 1995-04-10
FR2710372A1 (fr) 1995-03-31
DE69415559D1 (de) 1999-02-04

Similar Documents

Publication Publication Date Title
FR2573711A1 (fr) Systeme hydraulique de freinage avec regulation du glissement
CA2270579A1 (fr) Dispositif de maintien en position de la tige d'un verin hydraulique
FR2768171A1 (fr) Systeme de positionnement actif
EP0330575A1 (de) Hydraulischer Kreislauf mit zugehörigem Sicherheitsventil für hydraulische Verbraucher
FR2656049A1 (fr) Accumulateur de pression a piston, notamment pour systeme de freinage a regulation du glissement de traction.
FR2509831A1 (fr) Commande de remise en position pour soutenement a etancons hydrauliques, ainsi qu'une vanne de non-retour a commande hydraulique
FR2537184A1 (fr) Procede et circuit hydraulique pour economiser de l'energie lors de l'actionnement d'un cylindre de manoeuvre sur un excavateur hydraulique
WO1995008715A1 (fr) Dispositif de commande hydraulique d'un verin a double effet
US20090191068A1 (en) Variable volume reservoir
AU2007244339B2 (en) Inertia body drive device
WO2007026072A1 (fr) Dispositif de securite pour un puits de petrole et installation de securite associee
FR2662753A1 (fr) Dispositif de commande d'un verin hydraulique a double effet.
FR2602835A1 (fr) Amplificateur hydraulique d'effort de freinage
FR2547015A1 (fr) Actionneur a accumulateur d'energie pneumatique notamment pour robinet
FR2611236A1 (fr) Pompe hydraulique a pistons axiaux munie de clapets antiretour de refoulement commandes hydrauliquement
EP0494019B1 (de) Hydraulische, stösselbetätigte Abwurfvorrichtung mit automatischer Nachladung
FR2778212A1 (fr) Dispositif d'actionnement hydraulique
FR2634817A1 (fr) Dispositif pour commander des moyens hydrauliques d'actionnement dans une fleche de forage de roche et une structure de fleche analogue
FR2949143A1 (fr) Montage de commande hydraulique
FR2465108A2 (fr) Dispositif a soupape pour la distribution de fluide sous pression
EP0385816B1 (de) Druckfluidspeicher
FR2631598A1 (fr) Installation de freinage hydraulique a dispositif antiblocage pour vehicule automobile
FR2993325A1 (fr) Dispositif de commande du deplacement d'un verin hydraulique, notamment pour machines hydrauliques.
FR2479358A1 (fr) Dispositif de securite pour des verins hydrauliques, notamment pour des pelles hydrauliques
FR2487019A2 (fr) Dispositif de securite pour des verins hydrauliques, notamment pour des pelles hydrauliques

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19960419

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE ES GB IE LI NL

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 19980122

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE ES GB IE LI NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19981223

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19981223

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19981223

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 69415559

Country of ref document: DE

Date of ref document: 19990204

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: FRENCH

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19990324

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19981223

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990820

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990930

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990930

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL