EP0724542B1 - Electrohydraulic lifting device for motor vehicles - Google Patents
Electrohydraulic lifting device for motor vehicles Download PDFInfo
- 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
- Authority
- 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
Links
- 239000012530 fluid Substances 0.000 claims abstract description 40
- 238000004064 recycling Methods 0.000 claims abstract description 16
- 208000028659 discharge Diseases 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
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)
Abstract
Description
- Figures 1a and 1b show schematic side views of a lifting device, in a raised position and in a lowered position respectively;
- Figure 2 shows a plan view of the lifting device;
- Figure 3 shows a schematic diagram of the operation facility set up for a conventional lifting device;
- Figure 4 shows a schematic diagram of the electrohydraulic operation facility set up for the lifting device made in accordance with the present invention, as it looks at the starting;
- Figures 5, 6 and 7 show the same diagram of the electrohydraulic operation facility at an intermediate raising stage, at an intermediate lowering stage and when they are getting in mutual alignment on the floor, respectively.
Claims (5)
- Electrohydraulic lifting device for motor vehicles, including a pair of support platforms (1a,1b), respectively a first support platform and a second support platform, which are horizontal and parallel to each other, these support platforms (1a,1b) being mounted on respective tie rods (2) and respectively set in motion by a main cylinder (P1) and a secondary cylinder (P2) that is fed by the main cylinder (P1), under the control of an electrohydraulic control unit (16), which is equipped with a synchronisation device (17) placed along an auxiliary conduit (19), connecting a hydraulic media conduit (20) delivering hydraulic fluid to the said main cylinder (P1), with a recycling conduit (22) leading a suitable volume of hydraulic fluid from the same main cylinder (P1) to the said secondary cylinder (P2), the said lifting device being characterised in that said synchronisation device (17) includes a single synchronisation valve (18), aimed at opening the said connection between the hydraulic media conduit (20) and the recycling conduit (22) at the starting of the support platforms (1a,1b) from the floor level, or alternatively aimed at deviating an exceeding part of the recycled fluid to a discharge, when said support platforms (1a,1b) are reaching the floor level, to get them into alignment.
- Device as claimed in claim 1, characterised in that the said synchronisation valve (18) is mechanically operated, either to get open or closed, as a consequence of the lowering or raising of the said support platform (1b) respectively.
- Device as claimed in claim 1, characterised in that, when said support platforms (1a,1b) are starting from the floor level, some more hydraulic fluid is allowed to be pumped into said recycling conduit (22).
- Device as claimed in claim 1, characterised in that during normal operation, when the said support platforms (1a,1b) are raising or lowering, the said synchronisation valve (18) is normally closed, so that the said delivery conduit and the said recycling conduit (22) are not connected with each other, and the said secondary cylinder (P2) is fed only with the hydraulic fluid coming from the said main cylinder (P1) through the said recycling conduit (22).
- Device as claimed in claim 1, characterised in that when the support platforms are getting into alignment at the floor level, said synchronisation valve (18) is opened to deviate part of the fluid being discharged from the same main cylinder (P1) to the recycling conduit (22) for compensation of inadequacy of the recycling fluid present in said main cylinder (P1).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO930421 | 1993-10-22 | ||
IT93BO000421A IT1264250B1 (en) | 1993-10-22 | 1993-10-22 | "ELECTRO-HYDRAULIC LIFT DEVICE FOR VEHICLES" |
PCT/IT1994/000176 WO1995011190A1 (en) | 1993-10-22 | 1994-10-19 | Electrohydraulic lifting device for motor vehicles |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0724542A1 EP0724542A1 (en) | 1996-08-07 |
EP0724542B1 true EP0724542B1 (en) | 1998-05-13 |
Family
ID=11339278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95900255A Expired - Lifetime EP0724542B1 (en) | 1993-10-22 | 1994-10-19 | Electrohydraulic lifting device for motor vehicles |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0724542B1 (en) |
AT (1) | ATE166038T1 (en) |
AU (1) | AU8114694A (en) |
DE (2) | DE724542T1 (en) |
ES (1) | ES2116062T3 (en) |
IT (1) | IT1264250B1 (en) |
WO (1) | WO1995011190A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110219841A (en) * | 2019-06-14 | 2019-09-10 | 中国矿业大学(北京) | The hydraulic system of instantaneous off-load |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITVI980165A1 (en) * | 1998-09-07 | 2000-03-07 | Francesco Fiorese | HYDRAULIC CIRCUIT FOR THE OPERATION OF SERVICE BRIDGES FOR THE LIFTING OF VEHICLES |
IT1302678B1 (en) * | 1998-10-15 | 2000-09-29 | Texo Srl | VOLUMETRIC DRIVE SYSTEM FOR VEHICLE LIFTING LINKS. |
SE517223C2 (en) * | 2000-09-20 | 2002-05-14 | Morphic Technologies Ab | Hydraulic device for synchronizing at least two cooperating hydraulic pistons |
CN1331725C (en) * | 2003-12-31 | 2007-08-15 | 深圳市汇银实业开发有限公司 | Swing type lifter for assembling four link torsional force axial type synchro |
CN103407933B (en) * | 2012-09-03 | 2017-05-31 | 希实本株式会社 | Vehicle lifting with synchronizing function |
CN102992224A (en) * | 2012-12-01 | 2013-03-27 | 江苏华宏科技股份有限公司 | Multi-hydraulic-cylinder electro-hydraulic synchronous lifting system |
Family Cites Families (4)
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 (en) * | 1984-10-26 | 1986-05-07 | Otto Nußbaum GmbH & Co KG, 7640 Kehl | Hydraulically operated lifting device, especially lifting platform for motor vehicles |
US5072649A (en) * | 1991-01-07 | 1991-12-17 | Laghi Aldo A | Double actuator with bypass lines for synchronized movement |
NL9200686A (en) * | 1992-04-13 | 1993-11-01 | Stertil Bv | APPARATUS WITH SIMULTANEOUS HYDRAULIC JACKS. |
-
1993
- 1993-10-22 IT IT93BO000421A patent/IT1264250B1/en active IP Right Grant
-
1994
- 1994-10-19 EP EP95900255A patent/EP0724542B1/en not_active Expired - Lifetime
- 1994-10-19 ES ES95900255T patent/ES2116062T3/en not_active Expired - Lifetime
- 1994-10-19 DE DE0724542T patent/DE724542T1/en active Pending
- 1994-10-19 DE DE69410283T patent/DE69410283T2/en not_active Expired - Fee Related
- 1994-10-19 AU AU81146/94A patent/AU8114694A/en not_active Abandoned
- 1994-10-19 WO PCT/IT1994/000176 patent/WO1995011190A1/en active IP Right Grant
- 1994-10-19 AT AT95900255T patent/ATE166038T1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110219841A (en) * | 2019-06-14 | 2019-09-10 | 中国矿业大学(北京) | The hydraulic system of instantaneous off-load |
Also Published As
Publication number | Publication date |
---|---|
ATE166038T1 (en) | 1998-05-15 |
ITBO930421A1 (en) | 1994-01-22 |
DE69410283D1 (en) | 1998-06-18 |
AU8114694A (en) | 1995-05-08 |
EP0724542A1 (en) | 1996-08-07 |
ITBO930421A0 (en) | 1993-10-22 |
ES2116062T3 (en) | 1998-07-01 |
DE69410283T2 (en) | 1998-10-01 |
DE724542T1 (en) | 1997-04-03 |
IT1264250B1 (en) | 1996-09-23 |
WO1995011190A1 (en) | 1995-04-27 |
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