EP0438936B1 - Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique - Google Patents

Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique Download PDF

Info

Publication number
EP0438936B1
EP0438936B1 EP90403610A EP90403610A EP0438936B1 EP 0438936 B1 EP0438936 B1 EP 0438936B1 EP 90403610 A EP90403610 A EP 90403610A EP 90403610 A EP90403610 A EP 90403610A EP 0438936 B1 EP0438936 B1 EP 0438936B1
Authority
EP
European Patent Office
Prior art keywords
orifice
slide member
pressure
jack
pump
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.)
Expired - Lifetime
Application number
EP90403610A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0438936A1 (fr
Inventor
Alain Tessier
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.)
Enerpac France SAS
Original Assignee
France Power Packer SA
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 France Power Packer SA filed Critical France Power Packer SA
Publication of EP0438936A1 publication Critical patent/EP0438936A1/fr
Application granted granted Critical
Publication of EP0438936B1 publication Critical patent/EP0438936B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/15—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor with special provision for automatic return

Definitions

  • the invention relates to a device for automatically making a round trip to a double-acting hydraulic cylinder.
  • a device for automatically making a round trip to a double-acting hydraulic cylinder is generally used for the reversing cylinder of the plows, so that the round trip that it must perform during the reversal of the plow is done while the driver has kept his hydraulic control in the same position.
  • Devices of this type therefore use the difference between the maximum working pressure of the jack in the forward stroke and the pressure that the pump provides when the jack is in abutment at the end of the forward stroke, i.e. the pressure maximum that the pump can provide.
  • the effect which it exerts need only be greater than the maximum value beyond which the jack has started a forward stroke. Indeed, once the outward stroke has started, the draining pressure exerts its effect which complements that exerted by the spring, so that the drawer is held in the first position even if the pressure supplied by the pump is close to its maximum value, the change in position of the slide can only occur when the drain pressure has disappeared, that is to say when the cylinder has reached the end of its forward stroke.
  • the invention aims to provide a device in which the drawer has a simple structure, easy to obtain, and economical.
  • the device according to the invention is defined in claim 1. It differs from the aforementioned known device in particular by an L-shaped conduit formed in the thickness of the cylindrical piston which forms the distributor drawer, this L-shaped conduit being distinct from a possible conduit in which a piston is disposed, and opening respectively into a first transverse end wall and into the side wall near a second transverse end wall; by the fact that there are only the first to fourth orifices which are formed in the side wall of the cylindrical hollow of the distributor body in which the drawer is movable, the fifth orifice being formed in the second transverse wall of this hollow and the sixth orifice does not exist; and by the fact that in the second position of the drawer, the first orifice is in communication with the fourth orifice (and not with the sixth), the communication being made not only by means of the first chamber of the cylindrical hollow, but also by that of the L-shaped conduit whose orifice opening out through the side wall of the drawer is opposite the fourth orifice.
  • the L-shaped duct is connected to a complementary duct opening into the side wall of the drawer, opposite said second orifice of the cylindrical hollow in the first position of the drawer.
  • the complementary duct is aligned with the section of the L-shaped duct which opens into the side wall of the drawer, so that said section of the L-shaped duct and said complementary duct form a duct diametrically passing through the drawer.
  • the device 1 symbolized in FIG. 1 comprises as orifices, a fluid inlet orifice 2, a fluid outlet orifice 3, a first outlet orifice 4, and a second outlet orifice 5.
  • an inversion distributor 6 comprising a drawer 7 admitting a first position symbolized by the square 8 in which a first path allows fluid to pass from the orifice 2 to the orifice 4, while a second path allows fluid to pass from orifice 5 to orifice 3; whereas in the second position symbolized by the square 9, a third path allows fluid to pass from orifice 2 to orifice 5 while a fourth path allows fluid to pass from orifice 4 to l orifice 3.
  • the orifices 2 and 3 are connected to a hydraulic control 10 which is itself connected by a conduit 11 to a pump (not shown) and through a conduit 12 to a reservoir (not shown).
  • the control 10 comprises a drawer with three positions, a central rest position symbolized by the square 13, a normal working position symbolized by the square 14, and a reverse position symbolized by the square 15, a manual pusher 16 being provided for pushing or pull the drawer out to put it in the desired position.
  • the ports 2 and 3 are at the same pressure, in the normal working position, the port 2 is connected to the pump and the port 3 to the tank, while in the reverse position it is the port 3 which is connected to the pump and port 2 to the tank.
  • the orifice 4 is connected by a pipe 17 to a first chamber 18 of the jack 19, the second chamber 20 being connected to the orifice 5 by a pipe 21 on which is arranged a piloted non-return valve 22.
  • the valve 22 closes the chamber 20 so that the cylinder 19 remains in the illustrated rod-out position, and when there is pressure in the duct 17, the pilot opens the valve 22 so that the fluid can flow from the chamber 20 at port 5.
  • the drawer 7 of the distributor 6 automatically switches to the second position symbolized by the rectangle 9, and there is then the orifice 5 which is connected to the pump and the orifice 4 to the reservoir, so that the jack starts its return stroke, that is to say that the chamber 20 is filled and the chamber 18 is emptied.
  • the drawer 7 remains in the second position as long as the drawer of the control 10 is in the normal working position.
  • the slide valve is subjected to the effect of a drain pressure created by and upstream of the pressure regulator 25 disposed upstream of the orifice 3, this pressure acting thanks to a pilot 26 by means of a third surface by urging the drawer towards the first position, that is to say by completing the effect exerted by the spring 23.
  • the third surface and the predetermined value of the draining pressure are dimensioned so that the sum of the effects exerted by the spring and the draining pressure is greater than the effect exerted by the intermediary of the first surface when the pressure supplied by the pump is equal to the second predetermined value indicated above. It is thus possible, in the same example, to have a drain pressure value fixed at 2 bars, and a third surface 45 times larger than the first surface.
  • a non-return valve 28 is arranged in parallel with the pressure regulator means 25.
  • This non-return valve allows, in the case where there is interrupted the connection with the pump during the forward stroke of the jack, to return it to its starting position: we then act on the pusher 16 of the control 10 to move to the reverse position symbolized by the rectangle 15, the orifice 3 is then connected to the pump and the fluid can pass through the portion 27 thanks to the non-return valve 28 which opens, the fluid therefore arrives at the orifice 5, opens the non-return valve 22 and can come to fill the chamber 20 while the chamber 18 empties through the first path located between the orifices 4 and 2.
  • a restriction 30 has been provided which makes it possible to slow down the return stroke of the jack 19.
  • FIGS. 2 to 4 We will now describe in support of FIGS. 2 to 4 a one-piece device 100 according to the invention, the references used in FIG. 1 having been kept for similar elements.
  • the drawer 7 of the dispenser is in the form of a cylindrical piston having a side wall in which is formed an annular groove 31 while an L-shaped duct 32 formed in its thickness opens respectively into a first transverse wall end 33 and in the side wall near a second transverse end wall 34.
  • the drawer 7 further comprises in its thickness a second L-shaped duct 45 opening respectively into the transverse wall 33 and into the groove 31, a piston 46 being disposed in the section of the duct opening into the wall 33, this piston coming to bear on the wall 37 of the cylindrical hollow, and having a cross section corresponding to the surface value which has been called above first surface, by means of which the pressure of the pump acts on the slide in the first position.
  • the surface which has been called the second surface by means of which the pressure of the pump acts on the slide in the second position is produced by the wall 33
  • the surface which has been called the third surface, by means of which the draining pressure acts on the drawer is produced by the transverse wall 34 of the drawer.
  • conduit 32 is connected to a complementary conduit 47 opening into the side wall of the drawer, opposite the orifice 41 in the first position of the drawer. More precisely, the duct 47 is aligned with the section of the duct 32 which opens into the side wall of the drawer, so that this section and the duct 47 form a duct diametrically passing through the drawer.
  • Such a complementary duct is particularly advantageous because it simplifies the production of the seals between the drawer 7 and the side wall of the hollow in which it is movable. Indeed, if in the first position there are leaks between the annular groove 31 and the chamber 36, it will not result in overpressure in the chamber 36 which would disturb the operation of the device, since these leaks are eliminated towards the reservoir by the conduits 32, 47 and 29. Similarly, if there are leaks between the annular groove 31 and the chamber 38, they can be recovered by the conduits 32, 47 and 29, and in any case the means pressure regulator will prevent an overpressure ensuing in the chamber 38.
  • the pressure regulating means comprises a piston 48, arranged coaxially with the slide 7 in a hollow cylinder adjacent by the wall 39 to the cylindrical hollow in which the slide 7 is movable, the body 35 being common to the distributor and to the pressure regulator.
  • the piston 48 moves more or less to the right of the figures against the spring 49 to more or less open the orifice 50, in order to keep the pressure in the chamber constant 38.
  • the piston 48 is annular and slides around a hollow shaft 51 opening into the chamber 38, as well as into the non-return valve 28 connected to the orifice 3.
  • conduit 52 having a restriction is formed between the conduit 32 and the chamber 38. This conduit 52 allows the drawer 7, when it is in the second position and that there is no longer any pressure supplied by the pump, to return to the first position, the fluid located in the chamber 36 being able to be transferred to the chamber 38 via the conduits 32 and 52.
  • the piloted check valve referenced 22 in FIG. 1 is produced in a body 53 distinct from the body 35, it comprises a non-return valve 54 and a pilot 55 subjected to the pressure prevailing in the conduit 17, which when it becomes sufficient pushes it to move to the right of the figures, and to open the valve 54, as seen in FIG. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
  • Soil Working Implements (AREA)
  • Types And Forms Of Lifts (AREA)
  • Braking Arrangements (AREA)
EP90403610A 1989-12-22 1990-12-14 Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique Expired - Lifetime EP0438936B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8917151A FR2656386B1 (no) 1989-12-22 1989-12-22
FR8917151 1989-12-22

Publications (2)

Publication Number Publication Date
EP0438936A1 EP0438936A1 (fr) 1991-07-31
EP0438936B1 true EP0438936B1 (fr) 1994-09-21

Family

ID=9388935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403610A Expired - Lifetime EP0438936B1 (fr) 1989-12-22 1990-12-14 Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique

Country Status (6)

Country Link
EP (1) EP0438936B1 (no)
DE (1) DE69012779T2 (no)
ES (1) ES2060114T3 (no)
FI (1) FI95094C (no)
FR (1) FR2656386B1 (no)
NO (1) NO177652C (no)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720123B1 (fr) * 1994-05-19 1996-08-14 France Power Packer Sa Automatisme de commande hydraulique, notamment pour charrue.
NL1000971C2 (nl) 1995-08-11 1997-02-12 Applied Power Inc Ploegwentelinrichting.
DE19548943B4 (de) * 1995-12-28 2005-05-04 Bosch Rexroth Ag Ventilanordnung
NL1013077C2 (nl) 1999-09-17 2001-03-20 Applied Power Inc Kleppensamenstel, in het bijzonder voor een hydraulische ploegwentelinrichting.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548288B1 (fr) * 1983-06-29 1985-12-13 Applied Power Inc Dispositif permettant l'inversion automatique de l'alimentation d'un verin double effet hydraulique a partir d'une commande a simple ou double effet
NO154239C (no) * 1984-04-12 1986-08-13 Bryne Mek Verksted As Vendeventil.
DE3611710C1 (en) * 1986-04-08 1987-07-30 Integral Hydraulik Co Reversing device

Also Published As

Publication number Publication date
ES2060114T3 (es) 1994-11-16
FR2656386A1 (no) 1991-06-28
NO905567L (no) 1991-06-24
NO177652B (no) 1995-07-17
DE69012779D1 (de) 1994-10-27
FI906070A (fi) 1991-06-23
NO177652C (no) 1995-10-25
NO905567D0 (no) 1990-12-21
FI95094B (fi) 1995-09-15
DE69012779T2 (de) 1995-02-02
FR2656386B1 (no) 1992-04-30
EP0438936A1 (fr) 1991-07-31
FI906070A0 (fi) 1990-12-10
FI95094C (fi) 1995-12-27

Similar Documents

Publication Publication Date Title
EP0017592B1 (fr) Dispositif d'actionnement hydraulique à cinq positions
EP0289386B1 (fr) Valve hydraulique à trois voies
EP0438936B1 (fr) Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique
FR2480368A1 (fr) Ensemble de valves de commande a sections multiples
EP0434531B1 (fr) Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique
FR2855623A1 (fr) Appareil de controle d'une soupape hydraulique pour le maintien d'une charge
FR2720123A1 (fr) Automatisme de commande hydraulique, notamment pour charrue.
FR2549873A1 (fr) Circuit d'autonivellement commandant une fleche et une benne, notamment de tractopelle
FR2475739A1 (fr) Soupape de detection de deceleration
FR2883044A1 (fr) Injecteur de carburant pour moteur a combustion interne
EP0459840B1 (fr) Dispositif de commande d'un vérin hydraulique à double effet
FR2570521A1 (fr) Dispositif de regulation a deux domaines de pression
FR2731071A1 (fr) Indicateur de pression differentielle
FR2691517A1 (fr) Transmission hydrostatique comprenant des distributeurs de commande et de freinage alimentés par la même pression de commande.
EP0082048A1 (fr) Distributeur hydraulique
FR2656910A1 (fr) Transmission a commande hydraulique utilise pour la propulsion d'un vehicule, en particulier pour un tracteur agricole.
EP1137888A1 (fr) Distributeur hydraulique
FR2995370A1 (fr) Soupape de chambre accumulatrice a commande hydraulique de systeme de freinage de vehicule
EP0327774A1 (fr) Dispositif de fuite pour vidange d'un accumulateur à membrane
FR2555775A1 (fr) Dispositif d'actionnement de deux soupapes pouvant etre actionnees en interdependance
FR2732438A1 (fr) Soupape a deux voies du type a detection de pression a double sens
EP0039643A1 (fr) Fusible fluidique
EP3685080B1 (fr) Vanne thermostatique pour véhicule automobile
EP0153253B1 (fr) Distributeur hydraulique haute pression à clapet de décharge piloté mécaniquement
FR2484565A1 (fr) Systeme hydraulique de commande, notamment de haute pression, equipant par exemple un verin hydraulique

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES GB IT NL SE

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TESSIER, ALAIN

17P Request for examination filed

Effective date: 19911025

17Q First examination report despatched

Effective date: 19930420

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: POWER PACKER FRANCE SA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO ROMA S.P.A.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES GB IT NL SE

REF Corresponds to:

Ref document number: 69012779

Country of ref document: DE

Date of ref document: 19941027

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19941019

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2060114

Country of ref document: ES

Kind code of ref document: T3

EAL Se: european patent in force in sweden

Ref document number: 90403610.0

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: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20021212

Year of fee payment: 13

Ref country code: BE

Payment date: 20021212

Year of fee payment: 13

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

Ref country code: SE

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

Effective date: 20031215

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

Ref country code: BE

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

Effective date: 20031231

BERE Be: lapsed

Owner name: S.A. *POWER PACKER FRANCE

Effective date: 20031231

EUG Se: european patent has lapsed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20051229

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20051230

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20061129

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20061222

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20061231

Year of fee payment: 17

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 NON-PAYMENT OF DUE FEES

Effective date: 20070701

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20070701

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20061215

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

Ref country code: ES

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

Effective date: 20061215

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20071214

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 NON-PAYMENT OF DUE FEES

Effective date: 20080701

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

Ref country code: GB

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

Effective date: 20071214

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

Ref country code: IT

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

Effective date: 20071214