EP0724542B1 - Dispositif de levage electro-hydraulique pour vehicules a moteur - Google Patents

Dispositif de levage electro-hydraulique pour vehicules a moteur Download PDF

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Publication number
EP0724542B1
EP0724542B1 EP95900255A EP95900255A EP0724542B1 EP 0724542 B1 EP0724542 B1 EP 0724542B1 EP 95900255 A EP95900255 A EP 95900255A EP 95900255 A EP95900255 A EP 95900255A EP 0724542 B1 EP0724542 B1 EP 0724542B1
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EP
European Patent Office
Prior art keywords
conduit
main cylinder
fluid
cylinder
support platforms
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
EP95900255A
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German (de)
English (en)
Other versions
EP0724542A1 (fr
Inventor
Fausto Manganelli
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.)
Ravaglioli SpA
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Ravaglioli SpA
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Filing date
Publication date
Application filed by Ravaglioli SpA filed Critical Ravaglioli SpA
Publication of EP0724542A1 publication Critical patent/EP0724542A1/fr
Application granted granted Critical
Publication of EP0724542B1 publication Critical patent/EP0724542B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065—Scissor linkages, i.e. X-configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
    • B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
    • B66F7/20—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks by several jacks with means for maintaining the platforms horizontal during movement
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors

Definitions

  • the present invention relates to the technical field concerned with devices used to lift motor vehicles.
  • scissor lifts that are adapted to be fixed to the floor or to be set in a properly prepared seat.
  • the above mentioned devices basically include a pair of support platforms 1 that are horizontal and parallel to one another, these support platforms being long enough to hold the vehicle to be lifted.
  • the support platforms 1 are mounted on pairs of tie rods 2 which are hinged to one another at their midpoint, like a scissor, while respective cylinders 3 are connected to them.
  • sloped tracks 4 aimed at permitting a vehicle to run over the support platforms 1.
  • the support platforms are also equipped with stops 5,6 at their ends.
  • Such a device being known from DE-A-3499292.
  • the support platforms are not bound to each other, and they are mounted independently from each other, so that the space defined between them is left free and accessible.
  • the support platforms are moved by means of a hydraulic control unit that has the task of controlling the supply and discharge of the hydraulic pressure media to and from the respective cylinders, as it is shown in the diagram in Figure 3.
  • P1 and P2 respectively indicate the main cylinder and the secondary cylinder of the support platforms, while the support platforms are indicated by 1a, the former, and 1b the latter.
  • the main cylinder P1 is supplied, via the conduit 7, with fluid coming from the pump 8 that is operated by a motor 9.
  • a branch 10 starts from the conduit 7, downstream of the pump 8, and serves as a return way for the hydraulic media to the reservoir 11.
  • the branch 10 includes the solenoid valve 12, activated during the lowering stage, and the flow rate adjustment valve 13.
  • the main cylinder P1 in its turn, feeds the secondary cylinder P2 via the conduit 14.
  • Both the main cylinder and the secondary cylinder are equipped with respective cutoff valves 15.
  • Feeding the main cylinder P1 causes a certain volume of hydraulic media to flow from this cylinder to the secondary cylinder P2 that is in this way also fed.
  • the secondary cylinder P2 has a cross section reduced with respect to the main cylinder P1, that is, the cross section of the inner chamber of the secondary cylinder P2 has the same area as the working cross section area of the inner chamber of the main cylinder P1, i.e. the area calculated taking into account the presence of the stem therein.
  • the volume of fluid that is first displaced from the main cylinder P1 to the secondary cylinder P2 returns than back to the main cylinder P1 in the discharge stage, that is when the support platforms are lowered.
  • the support platforms remain at different height, that is the first support platform 1a is at an higher level than the second support platform 1b.
  • the second cylinder P2 is delayed with respect to the first cylinder P1, and this is due to the compressibility of the hydraulic fluid. Because of the compressibility of the hydraulic fluid, an initial motion of the plunger of the cylinder P1 does not determine a corresponding fluid displacement but only a fluid compression, and therefore the cylinder P2 is not operated.
  • This delay effect is increased at the starting because this condition is the one in which the fluid is at the maximum pressure, considering a certain constant load, and because the cylinders are in an almost horizontal position, and therefore the ratio between the vertical motion of the support platforms and the motion of the plungers is the highest.
  • the two cylinders P1 and P2 are fed independent from one another (for example, by means of a flow distributor valve) and synchronism of the two support platforms 1a,1b is obtained by means of a mechanical linkage set between the tie rods 2 (see Fig. 1a).
  • German patent DE 3439292 discloses a synchronisation device comprising two valves, the first of whose is located between the recycling conduit, connecting the main cylinder to the secondary cylinder, and a discharge reservoir; the second valve is located between the same conduit and the main hydraulic conduit.
  • the first valve is normally closed, and it is opened by a first support platform, moved by the secondary cylinder, when it reaches its upper end position.
  • the second valve is normally closed, and it is opened by a second support platform, moved by the main cylinder, when it reaches its upper end position.
  • the platforms are nonaligned, in order to get them into alignment, they must be taken to their higher position, by connecting the recycling conduit either to a discharge, if the first platform is higher than the second one, or to the main circuit, if said first platform is lower.
  • That mode of operation leads to some undesirable situations in operating the lifting device.
  • the object of the present invention is to contrive an electrohydraulic lifting device in which the motion of the two support platforms is kept synchronous and in which the support platforms are perfectly in alignment with each other, when they are at the floor level at the end of every working cycle. This is obtained by providing for a compensation to the compressing action of the hydraulic media at the starting.
  • an electrohydraulic lifting device for motor vehicles includes a pair of support platforms, respectively a first support platform and a second support platform, which are horizontal and parallel to each other, and mounted on respective tie rods respectively actuated by a main cylinder and by a secondary cylinder.
  • the secondary cylinder is fed by the main cylinder, under the control of a hydraulic control unit.
  • the hydraulic control unit is equipped with a synchronisation device including a synchronisation valve (18) aimed at connecting a hydraulic media conduit, delivering hydraulic fluid to the said main cylinder, with a recycling conduit leading a suitable volume of hydraulic fluid from the same main cylinder to the secondary cylinder, so as to compensate the inadequacy of the delivery of fluid to the secondary cylinder, or alternatively aimed at deviating an exceeding part of the recycled fluid to a discharge, respectively at the starting and when the support platforms are getting into alignment at the floor level.
  • a synchronisation device including a synchronisation valve (18) aimed at connecting a hydraulic media conduit, delivering hydraulic fluid to the said main cylinder, with a recycling conduit leading a suitable volume of hydraulic fluid from the same main cylinder to the secondary cylinder, so as to compensate the inadequacy of the delivery of fluid to the secondary cylinder, or alternatively aimed at deviating an exceeding part of the recycled fluid to
  • the electrohydraulic control unit 16 of the subject lifting device includes a synchronisation device 17 that is aimed at keeping the synchronism of the motion of the two support platforms 1a and 1b.
  • This synchronisation device 17 is equipped with a mechanically operated valve 18 that is mounted on an auxiliary conduit 19 through which the hydraulic media is delivered to the secondary cylinder P2.
  • the auxiliary conduit 19 starts from the conduit 20 used to feed the main cylinder P1.
  • the normally closed two-way synchronisation valve 18 is controlled by the support platform 1b, by means of a push rod 21.
  • the part of the conduit 19 downstream of the synchronisation valve 18, is connected to the recycling conduit 22 that leads the hydraulic flow from the main cylinder P1 to the secondary cylinder P2.
  • the conduit 22 there is set a pressure switch 23 and a normally closed cock 24 connected to the supply conduit 20.
  • the raising motion of the support platform 1b causes the synchronisation valve 18 to close, so that afterwards, during the raising motion of the support platforms, the conduits 20 and 22 are no longer connected to each other. Then, the secondary cylinder P2 is supplied only with the fluid displaced from the main cylinder P1 through the recycling conduit 22 (See Figure 5).
  • the fluid used to actuate the main cylinder P1 is instead sent to the reservoir 11 through the conduit 10 after that the solenoid valve 12 has been properly opened.
  • the support platform 1b provokes again opening of the synchronisation valve 18, so that the fluid from the secondary cylinder P2 also flows through the auxiliary conduit 19 (see Figure 7).
  • the support platform 1b keeps the synchronisation valve 18 open through a rising stroke of about 10 mms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (5)

  1. Dispositif de levage électro-hydraulique pour des véhicules à moteur, incluant une paire de plate-formes de support (1a, 1b), respectivement une première plate-forme de support et une seconde plate-forme de support, qui sont horizontales et parallèles l'une à l'autre, ces plate-formes de support (1a, 1b) étant montées sur des tiges de liaison respectives (2) et respectivement mis en mouvement par un piston principal (P1) et un piston secondaire (P2) qui est alimenté par le piston principal (P1), sous la commande d'une unité de commande électro-hydraulique (16) qui est équipée avec un dispositif de synchronisation (17) placé le long d'un conduit auxiliaire (19), reliant un conduit de milieu hydraulique (20) délivrant du fluide hydraulique audit piston principal (P1), avec un conduit de recyclage (22) conduisant un volume adapté de fluide hydraulique depuis le même piston principal (P1) vers ledit piston secondaire (P2), ledit dispositif de levage étant caractérisé en ce que ledit dispositif de synchronisation (17) inclut une vanne de synchronisation unique (18), assurant en ouverture ladite connexion entre le conduit de milieu hydraulique (20) et le conduit de recyclage (22) au départ des plate-formes de support (1a, 1b) du niveau du sol ou alternativement assurant en déviation l'évacuation d'une partie excédentaire du fluide recyclé vers un échappement, lorsque lesdites plate-formes de support (1a, 1b) ont atteint le niveau du sol pour amener celles-ci en alignement.
  2. Dispositif selon la revendication 1, caractérisé en ce que ladite vanne (18) de synchronisation est commandée de manière mécanique soit pour être ouverte soit pour être fermée, en conséquence de l'abaissement ou de l'élévation de ladite plate-forme de support (1b) respectivement.
  3. Dispositif selon la revendication 1, caractérisé en ce que, lorsque lesdites plate-formes de support (1a, 1b) sont en train de démarrer du niveau du sol, plus de fluide hydraulique est autorisé à être pompé dans ledit conduit de recyclage (22).
  4. Dispositif selon la revendication 1, caractérisé en ce que, en fonctionnement normal, lorsque lesdites plate-formes de support (1a, 1b) sont en train de monter ou descendre, ladite vanne de synchronisation (18) est normalement fermée, de sorte que ledit conduit de délivrance et ledit conduit de recyclage (22) ne sont pas reliés l'un à l'autre et ledit second piston (P2) est alimenté seulement avec le fluide hydraulique venant dudit piston principal (P1) à travers ledit conduit de recyclage (22).
  5. Dispositif selon la revendication 1, caractérisé en ce que, lorsque les plate-formes de support viennent en alignement au niveau du sol, l'inadéquation du fluide de recyclage présent dans ledit piston principal (P1) est compensée en dérivant une partie du fluide étant déchargé depuis le même piston principal (P1) vers le conduit de recyclage (22).
EP95900255A 1993-10-22 1994-10-19 Dispositif de levage electro-hydraulique pour vehicules a moteur Expired - Lifetime EP0724542B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITBO930421 1993-10-22
IT93BO000421A IT1264250B1 (it) 1993-10-22 1993-10-22 "dispositivo sollevatore elettroidraulico per autoveicoli"
PCT/IT1994/000176 WO1995011190A1 (fr) 1993-10-22 1994-10-19 Dispositif de levage electro-hydraulique pour vehicules a moteur

Publications (2)

Publication Number Publication Date
EP0724542A1 EP0724542A1 (fr) 1996-08-07
EP0724542B1 true EP0724542B1 (fr) 1998-05-13

Family

ID=11339278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95900255A Expired - Lifetime EP0724542B1 (fr) 1993-10-22 1994-10-19 Dispositif de levage electro-hydraulique pour vehicules a moteur

Country Status (7)

Country Link
EP (1) EP0724542B1 (fr)
AT (1) ATE166038T1 (fr)
AU (1) AU8114694A (fr)
DE (2) DE724542T1 (fr)
ES (1) ES2116062T3 (fr)
IT (1) IT1264250B1 (fr)
WO (1) WO1995011190A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110219841A (zh) * 2019-06-14 2019-09-10 中国矿业大学(北京) 瞬时卸荷的液压系统

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI980165A1 (it) * 1998-09-07 2000-03-07 Francesco Fiorese Circuito oleodinamico per l'azionamento di ponti di servizio per il sollevamento di veicoli
IT1302678B1 (it) * 1998-10-15 2000-09-29 Texo Srl Sistema volumetrico di azionamento per ponti sollevatori di veicoli.
SE517223C2 (sv) * 2000-09-20 2002-05-14 Morphic Technologies Ab Hydraulanordning för synkronisering av åtminstone två samverkande hydraulkolvar
CN1331725C (zh) * 2003-12-31 2007-08-15 深圳市汇银实业开发有限公司 装备四连杆扭力轴式同步器的摆动式举升器
CN103407933B (zh) * 2012-09-03 2017-05-31 希实本株式会社 具有同步功能的车辆升降装置
CN102992224A (zh) * 2012-12-01 2013-03-27 江苏华宏科技股份有限公司 多液压缸电液同步举升系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476016A (en) * 1967-10-20 1969-11-04 Cascade Corp Apparatus for producing coordinated,simultaneous actuation of multiple rams
DE3439292A1 (de) * 1984-10-26 1986-05-07 Otto Nußbaum GmbH & Co KG, 7640 Kehl Hydraulisch betaetigte hubvorrichtung, insbesondere hebebuehne fuer kraftfahrzeuge
US5072649A (en) * 1991-01-07 1991-12-17 Laghi Aldo A Double actuator with bypass lines for synchronized movement
NL9200686A (nl) * 1992-04-13 1993-11-01 Stertil Bv Inrichting met gelijklopende hydraulische vijzels.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110219841A (zh) * 2019-06-14 2019-09-10 中国矿业大学(北京) 瞬时卸荷的液压系统

Also Published As

Publication number Publication date
DE724542T1 (de) 1997-04-03
ES2116062T3 (es) 1998-07-01
ITBO930421A0 (it) 1993-10-22
DE69410283T2 (de) 1998-10-01
AU8114694A (en) 1995-05-08
WO1995011190A1 (fr) 1995-04-27
IT1264250B1 (it) 1996-09-23
ATE166038T1 (de) 1998-05-15
EP0724542A1 (fr) 1996-08-07
DE69410283D1 (de) 1998-06-18
ITBO930421A1 (it) 1994-01-22

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