EP1481168B1 - Ensemble soupape hydraulique multifonctions - Google Patents

Ensemble soupape hydraulique multifonctions Download PDF

Info

Publication number
EP1481168B1
EP1481168B1 EP20030701411 EP03701411A EP1481168B1 EP 1481168 B1 EP1481168 B1 EP 1481168B1 EP 20030701411 EP20030701411 EP 20030701411 EP 03701411 A EP03701411 A EP 03701411A EP 1481168 B1 EP1481168 B1 EP 1481168B1
Authority
EP
European Patent Office
Prior art keywords
operator
valve
hydraulic
port
assembly
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
EP20030701411
Other languages
German (de)
English (en)
Other versions
EP1481168A1 (fr
Inventor
Luciano Mondani
Mark Dodd
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.)
Lift Technologies Inc Canada
Original Assignee
Lift Technologies Inc Canada
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
Priority claimed from US10/120,789 external-priority patent/US6782910B2/en
Application filed by Lift Technologies Inc Canada filed Critical Lift Technologies Inc Canada
Publication of EP1481168A1 publication Critical patent/EP1481168A1/fr
Application granted granted Critical
Publication of EP1481168B1 publication Critical patent/EP1481168B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/14—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements
    • B66F9/142—Movements of forks either individually or relative to each other
    • B66F9/143—Movements of forks relative to each other - symmetric
    • 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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/14—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements
    • B66F9/147—Whole unit including fork support moves relative to mast
    • B66F9/148—Whole unit including fork support moves sideways
    • 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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • 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
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2544—Supply and exhaust type
    • Y10T137/2554—Reversing or 4-way valve systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve
    • Y10T137/86694—Piston valve
    • Y10T137/8671—With annular passage [e.g., spool]

Definitions

  • the invention is related to hydraulic systems, and in particular, to a multi-function hydraulic valve assembly.
  • hydraulic systems for moving or lifting loads.
  • such systems utilize hydraulic fluid under pressure to drive hydraulic operators, such as piston/cylinder arrangements.
  • a piece of machinery, such as a hoist or a truck may require several hydraulic operators to move the load in different ways.
  • the various hydraulic operators are each controlled by a lever located in the cab of the machine or vehicle.
  • One example where hydraulic systems are used in this way are lift trucks.
  • Lift trucks are vehicles which are used to pick up and move loads from place to place.
  • a conventional lift truck includes a carriage which supports a pair of forks. The forks are maneuvered into place by the lift truck operator and are used to pick up the load.
  • the carriage rides vertically in a mast, which also supports the carriage. In addition the mast may be tilted backward to facilitate stabilizing the load on the forks.
  • Two separate hydraulic operators are used to move the carriage vertically and to tilt the mast.
  • a side shift assembly which facilitates aligning the spaced pair of forks with the load.
  • side shifting is used io describe the concept of shifting the forks as a spaced pair either left or right of the vehicle center line. This function provides the operator with a greater margin for error when aligning the vehicle with the load.
  • a hydraulic operator such as a piston/cylinder arrangement is typically used by the side shifting assembly to move a frame to which the forks are secured.
  • a fork positioning assembly Another attachment to enhance the capability of a lift truck is a fork positioning assembly.
  • the term fork positioning is used to describe the concept of changing the relative spacing between the forks to accommodate loads of different widths.
  • a hydraulic operator such as a piston/cylinder arrangement is used in the fork positioning assembly to move the forks.
  • a cab of a conventional lift truck provides three levers to operate three hydraulic operators. Accordingly, if a user requires four hydraulic operators, such as, for example, by installing a fork positioning attachment, an additional lever must be installed to operate the fork positioning attachment.
  • prior art systems such as US-A-5 139 385 permit operation of two separate hydraulic operators with a single lever on a lift truck. These systems utilize an electrical circuit to toggle between the two hydraulic operators. Prior to moving the lever which actuates the hydraulic system, the user would activate the electrical switch to select the appropriate hydraulic operator. This system adds expense and complexity to the design of the lift truck. In addition, electrical cables must be provided and extended over the lift truck mast.
  • FR2720123 discloses an automated hydraulic control for use in ploughs.
  • the present invention relates to a hydraulic valve assembly as set out in claim 1.
  • Figure 1 is a schematic of a hydraulic system for a lift truck
  • Figure 2 is a perspective view of a valve assembly according to a preferred embodiment of the present invention.
  • Figure 3 is a cross-sectional view of a valve block for the preferred embodiment of Figure 2 ;
  • Figure 4 is a perspective view of a selection valve for the preferred embodiment of Figure 2 ;
  • Figure 5A is a cross-sectional view of the preferred embodiment of Figure 2 in a first position showing fluid flow in one direction;
  • Figure 5B is a cross-sectional view of the preferred embodiment in the first position as shown in Figure 5A , but showing fluid flow in an opposite direction;
  • Figure 5C is a cross-sectional view of the preferred embodiment of Figure 2 in a second position showing fluid flow in one direction;
  • Figure 5D is a cross-sectional view of the preferred embodiment in the second position, as shown in Figure 5C , but showing fluid flow in the opposite direction;
  • Figure 6 is a schematic view showing the preferred embodiment of Figure 2 connected to a side shifter and fork positioner.
  • FIG. 1 shows a hydraulic system for a lift truck connected to a valve assembly 10 according to a preferred embodiment of the present invention.
  • the valve assembly 10 is connected to a control panel 11 by a first hydraulic supply line 12 and a second hydraulic supply line 14.
  • the control panel 11 is connected to a hydraulic fluid tank 16 by a tank supply line 18 and a tank return line 20.
  • a pump (not shown) is connected to the tank supply line 18 to provide the hydraulic fluid under pressure.
  • control panel 11 includes a hydraulic circuit 26 to interchangeably connect the tank supply and return lines 18, 20 to the first and second hydraulic supply lines 12 and 14.
  • the circuit 26 is operated in a conventional manner and will not be further described.
  • the circuit 26 is hydraulically connected to three corresponding levers in the lift truck cab. Other similar circuits may be used to control other vehicle functions such as mast tilting, carriage raising, and the like. For convenience, only the lever 28 for operating the particular circuit 26 is shown. It will be understood by those skilled in the art that other types of actuators may be provided.
  • the valve assembly includes a valve block 30, which preferably has a box-like shape.
  • a first supply port 32 and a second supply port 34 are provided in the valve block 30.
  • the first and second supply ports 32, 34 communicate with first and second hydraulic supply lines 12, 14 (shown in Figure 1 ), respectively.
  • the supply ports 32, 34 are located on the same face of the block 30.
  • An orifice valve 35 (shown in Figures 5A-5D ) is preferably provided between the supply ports 32 and 34. The function of this orifice valve is discussed below.
  • the diameter of the orifice valve may be about 1.09mm (0.043 inches).
  • a first chamber 36 and a second chamber 38 are provided in the valve block 30.
  • the first and second chambers 36, 38 communicate with first and second supply ports 32, 34 via first and second block channels 40 and 42.
  • a first operator port 44 and a second operator port 46 are provided on one face of the block 30, and a third operator port 48 and a fourth operator port 50 are provided on the opposite face of the block 30.
  • the first and second operator ports 44, 46 communicate with the first chamber 36.
  • the third and fourth operator ports 48, 50 communicate with the second chamber 38.
  • the first and third operator ports 44, 48 are connected to corresponding ports (not shown) of a first conventional hydraulic operator 80.
  • the first hydraulic operator may be, for example, a fork positioning cylinder.
  • the second and fourth operator ports 46, 50 are connected to corresponding ports (not shown) of a second hydraulic operator 82.
  • the second hydraulic operator may be, for example, a side shifting cylinder.
  • a pilot channel 52 is provided in the valve block 30.
  • the pilot channel 52 communicates with first and second chambers 36, 38.
  • the pilot channel 52 also communicates with first and second block channels 40, 42, all three meeting at an intersection 54.
  • a bi-directional valve 56 is located in the intersection 54.
  • the bi-directional valve is a conventional ball and shuttle valve. The bi-directional valve alternatively connects pilot channel 52 with block channel 40 or block channel 42.
  • a first conventional selection valve 60 is located in the first chamber 36 and a second conventional selection valve 61 is located in the second chamber 38.
  • the selection valves 60, 61 are identical.
  • such valves are commercially available from various valve manufacturers.
  • One useful example is a valve sold by Hydraforce Inc. (Model No. PD 10-40).
  • the first selection valve 60 includes a generally cylindrical valve housing 62 mounted in the first chamber 36.
  • the cylindrical valve housing 62 has an open end proximate to the pilot channel 52, and defines an internal valve chamber 64.
  • the cylindrical valve housing 62 also includes a plurality of radially directed circumferentially arranged openings 65 for communicating with the first chamber 36.
  • a moving valve body 66 is located within the valve chamber 64 of valve housing 62.
  • the valve body 66 has a pressure surface 68 adjacent the open end of the valve housing 62.
  • the valve body 66 has a narrower portion which defines an annular space 69.
  • the radially directed openings 65 communicate with the annular space 69 between the valve body 66 and the valve housing 62.
  • the valve body 66 is connected to a spring 74 located in a closed end of the cylindrical valve housing 62.
  • Valve body 66 may be moved relative to valve housing 62 by collapsing the spring 74.
  • the spring 74 biases the valve body 66 to the position shown in Figures 5A and 5B .
  • the spring resistance is configured such that a pressure of 2.17 MPa (315 PSI) or greater applied to pressure surface 68 is required to collapse the spring 74 so that the valve body 66 may move to the position shown in Figures 5C and 5D .
  • a number of external O-rings 70, 72 are provided to seal portions of the first selection valve 60 against portions of the wall of the first chamber 36.
  • Internal O-rings (not shown) are also provided to seal the upper and lower ends of the annular space 69 from the remainder of the valve chamber 64 to prevent bleeding of fluid between the valve body 66 and valve housing 62.
  • the second selection valve 61 is the same as the first selection valve 60, it will not be described in detail.
  • valve assembly 10 For convenience, the operation of the present invention will be described in conjunction with a conventional hydraulically-operated fork positioner 80 and side shifter 82 for a lift truck.
  • the first hydraulic operator will be the fork positioner
  • the second hydraulic operator will be the side shifter.
  • the present invention may be operated with any two hydraulic operators requiring different pressure, and is not confined to fork positioners and side shifters, or to hydraulic operators for lift trucks. The operators could be used for any desired function, such as rotating, tilting, clamping, or the like.
  • the lift truck operator when the lift truck operator wishes to actuate the fork positioner in a first direction, such as to narrow the forks, the operator moves the lever 28 part-way in one direction.
  • the circuit 26 is partially activated to supply hydraulic fluid from the hydraulic fluid tank 16 along tank supply line 18, through section 22, and then to the first hydraulic supply line 12. Because, the circuit 26 is only, parity activated, the flow rate of hydraulic fluid in the first hydraulic supply line 12 is low, resulting in low pressure as explained below.
  • low pressure means pressure below 2.17 MPa (315 PSI).
  • the hydraulic fluid enters the first supply port 32 and flows into first channel 40.
  • the pressure of the fluid in first block channel 40 moves the bi-directional valve 56 into a position permitting fluid communication between first block channel 40 and pilot channel 52, while sealing off communication between second block channel 42 and the pilot channel 52.
  • the pressure of the fluid in the pilot channel 52 acts on the pressure surface 68 of each of the selection valves 60, 61. Because the pressure is below 2.17 MPa (315 PSI), neither of the valve bodies 66 of the selection valves 60, 61 move. Accordingly, the annular channels of selection valves 60 and 61 remain aligned with first operator port 44 and third operator port 48, respectively.
  • the supply fluid in first block channel 40 also enters the annular space 69 through the radially directed openings 65 in the cylindrical housing 62 of the first selection valve 60.
  • the fluid exits from the annular space 69 of first selection valve 60 through additional radially directed openings 65 and enters first operator port 44.
  • the fluid is prevented from entering second operator port 46 by O-ring 70 and the internal O-rings of the selection valve 60.
  • the hydraulic fluid travels to the fork positioner 80 by line 84 connected to first operator port 44.
  • hydraulic fluid also leaves the fork positioner 80 and enters third operator port 48 via line 86.
  • the fluid is routed to second block channel 42 through the second selection valve 61, in a similar but reverse manner as described for first selection valve 60.
  • the fluid exits the valve assembly 10 at second supply port 34 along second supply line 14.
  • the operator moves the lever 28 part-way in the opposite direction causing the circuit 26 to partially activate so that section 24 is employed to direct a low pressure flow of fluid from the hydraulic fluid supply tank 16 into the second hydraulic supply line 14.
  • the hydraulic fluid enters the valve block 30 via the second supply port 34 and into the second block channel 42.
  • the bi-directional valve 56 is moved in the other direction such that it is now the second block channel 42 which communicates with the pilot channel 52. Because it is low pressure fluid, neither of the valve bodies 66 of selection valves 60 and 61 move from the position shown in Figure 2B . However, the hydraulic fluid flows through second selection valve 61 in the same manner as described for the first selection valve 60.
  • the hydraulic fluid flows out of third operator port 48 and into line 86 to the fork positioner 80. This causes the fork positioner to operate in the opposite direction.
  • Hydraulic fluid flowing out of fork positioner 80 into line 84 enters the valve assembly 10 at first operator port 44.
  • the returning fluid is directed into first channel 40 by the first selection valve 60, as described above.
  • the fluid exits at first supply port 32 and is returned to the tank return line 20 via first supply line 12.
  • moving the lever 28 either way causes the fork positioner 80 to move in either direction (i.e. narrowing or widening the fork spacing).
  • high pressure means pressure of 2.17 MPa (315 PSI) or higher.
  • the hydraulic fluid enters the first chamber 36 along the same path as described for the narrowing function of the fork positioner.
  • the now high pressure fluid passes to the pilot channel 52 and acts against surface 68 of each of the valve bodies 66 of the selection valves 60 and 61. Because the pressure in the pilot channel 52 acting against pressure surface 68 of each valve body 66 is greater than the resistance of the respective springs 74, the valve body 66 of each selection valve moves against the spring 74. This moves the valve bodies 66 to the positions shown in Figures 5C and 5D , and thereby permits fluid in first block channel 40 to flow through annular space 69 and into second operator port 46. O-ring 72 prevents fluid communication with first operator port 44.
  • hydraulic fluid flows to the side shifter 82 along line 88.
  • Hydraulic fluid returns to fourth operator port 50 along line 90, then through selection valve 61.
  • the fluid flows through the valve block 30 and out through the second supply port 34 in a manner analogous to the manner described above.
  • the fluid is returned to the tank in the same manner as described for the narrowing function of the fork positioner.
  • the hydraulic operators are able to achieve their required functions while operating at different pressures.
  • One pressure is referred to herein as the lower pressure, while the other pressure is referred to as the higher pressure.
  • Absolute values are, of course, widely variable. However, it is preferred that the two pressures differ by about 0.345 MPa (50 PSI).
  • fork positioning can be successfully preformed using pressures of less than 1.72 MPa (250 PSI), while side shifting can be accomplished using pressures above 2.24 MPa (325 PSI).
  • Other pressures and other pressure differentials can be used depending on the vehicle and the implements being controlled.
  • the high pressure in the supply lines 12 and 14 is achieved by moving lever 28 quickly to the full open position in the desired direction.
  • the lever When fork positioning is desired, the lever is moved in the desired direction only part way.
  • the initial fluid pressure available at control panel 11 is usually relatively low and, in any event, only a restricted flow occurs.
  • the restricted flow occurs at a lower pressure, and thus, fluid reaching the valve assembly 10 is at the lower pressure.
  • the forks can be moved using the lower pressure.
  • the restricted fluid continues to flow as the forks move and pressure does not build up in supply lines 12 or 14 or in valve block 30.
  • This means the selection valves 60 and 61, remain in the starting position shown in Figures 2A and 2B under the pressure exerted by spring 74 and fork positioning continues to occur for as long as desired and in the direction desired
  • the orifice valve 35 may be provided to reduce any hammer effect which may be caused by sudden changes in direction of the fluid flow.
  • the preferred embodiment of the invention described above is configured to provide selectable, two-way, hydraulically actuated movement.
  • certain hydraulic operators may require only one way movement.
  • the return movement of the hydraulic operator may be provided by some other source, such as a spring or gravity.
  • the second supply port 34, second block channel 42, second selection valve 61, bi-directional valve 56, and third and fourth operator ports 48, 50 may be omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Multiple-Way Valves (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Valve Housings (AREA)
  • Servomotors (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (18)

  1. Ensemble de soupape hydraulique (10) pour distribuer sélectivement un fluide hydraulique d'une alimentation (16) en fluide hydraulique à un d'un premier opérateur hydraulique (80) et d'un deuxième opérateur hydraulique (82), ledit ensemble comprenant:
    a) un bloc de soupape (30) définissant:
    i) un premier orifice d'alimentation (32) conçu pour une communication fluidique avec ladite alimentation (16);
    ii) un deuxième orifice d'alimentation (34) conçu pour une communication fluidique avec ladite alimentation (16);
    iii) un premier orifice d'opérateur (44) conçu pour une communication fluidique avec ledit premier opérateur hydraulique (80);
    iv) un deuxième orifice d'opérateur (46) conçu pour une communication fluidique avec ledit deuxième opérateur hydraulique (82);
    v) un troisième orifice d'opérateur (48) conçu pour la communication fluidique avec ledit premier opérateur hydraulique (80);
    vi) un quatrième orifice d'opérateur (50) conçu pour une communication fluidique avec ledit deuxième opérateur hydraulique (82);
    vii) une première chambre (36), ladite première chambre étant en communication fluidique avec ledit premier orifice d'alimentation (32), ledit premier orifice d'opérateur (44) et ledit deuxième orifice d'opérateur (46);
    viii) une deuxième chambre (38), ladite deuxième chambre étant en communication fluidique avec ledit deuxième orifice d'alimentation (34), ledit troisième orifice d'opérateur (48) et ledit quatrième orifice d'opérateur (50);
    b) une première soupape de sélection (60) située dans ladite première chambre (36) et une deuxième soupape de sélection (61) située dans ladite deuxième chambre (38), lesdites première et deuxième soupapes de sélection (60,61) étant aptes à se déplacer conjointement, lesdites première et deuxième soupapes de sélection (60,61) étant actionnables entre une première position dans laquelle ledit fluide hydraulique se trouve à une première pression et une deuxième position dans laquelle ledit fluide hydraulique se trouve à une deuxième pression, où dans ladite première position, ladite première soupape de sélection (60) permet une communication fluidique entre ledit premier orifice d'alimentation (32) et ledit premier orifice d'opérateur (44), et ladite deuxième soupape de sélection (61) permet une communication fluidique entre ledit deuxième orifice d'alimentation (34) et ledit troisième orifice d'opérateur (48), où, dans ladite deuxième position, ladite première soupape de sélection (60) permet une communication fluidique entre ledit premier orifice d'alimentation (32) et ledit deuxième orifice d'opérateur (46), et ladite deuxième soupape de sélection (61) permet une communication fluidique entre ledit deuxième orifice d'alimentation (34) et ledit quatrième orifice d'opérateur (50);
    où ladite première pression est plus basse que ladite seconde pression.
  2. Ensemble (10) selon la revendication 1, comprenant en outre un actionneur (28) fonctionnellement relié à ladite alimentation (16), ledit actionneur (28) étant déplaçable sélectivement entre une première position d'actionneur apte à délivrer ledit fluide hydraulique audit premier orifice d'alimentation (32) à ladite première pression, une deuxième position d'actionneur apte à délivrer ledit fluide hydraulique audit premier orifice d'alimentation (32) à ladite deuxième pression, une troisième position d'actionneur apte à délivrer ledit fluide hydraulique audit deuxième orifice d'alimentation. (34) à ladite première pression et une quatrième position d'actionneur apte à délivrer ledit fluide hydraulique audit deuxième orifice d'alimentation (34) à ladite deuxième pression, lesdites première et troisième positions d'actionneur étant aptes à permettre un mouvement alternatif dudit premier opérateur hydraulique (80), et lesdites deuxième et quatrième positions d'actionneur permettant un mouvement alternatif dudit deuxième opérateur hydraulique (82).
  3. Ensemble (10) selon la revendication 2, où lorsque ledit actionneur (28) se trouve dans lesdites première et deuxième positions, ledit fluide hydraulique est ramené à ladite alimentation (16) depuis ledit deuxième orifice d'alimentation (34), et lorsque ledit actionneur (28) se trouve dans lesdites troisième et quatrième positions, ledit fluide hydraulique est ramené à ladite alimentation (16) depuis ledit premier orifice d'alimentation (32).
  4. Ensemble (10) selon la revendication 3, où ledit actionneur (28) comprend un levier relié à un circuit hydraulique (26).
  5. Ensemble (10) selon la revendication 4, où ledit levier (28) est déplaçable d'une position centrale au repos dans deux directions opposées, où dans ladite première position d'actionneur, ledit levier (28) est partiellement déplacé dans une direction et dans ladite troisième position d'actionneur, ledit levier (28) est déplacé partiellement dans une direction opposée, où dans ladite deuxième position d'actionneur, ledit levier (28) s'est déplacé sensiblement entièrement dans ladite direction précitée, et dans ladite quatrième position d'actionneur, ledit levier (28) s'est déplacé sensiblement entièrement dans ladite direction opposée.
  6. Ensemble (10) selon la revendication 1, où ledit bloc de soupape (30) définit un canal pilote (52), ledit canal pilote (52) étant conçu pour une communication fluidique avec ladite première chambre (36) et ladite deuxième chambre (38), et un parmi ledit orifice d'alimentation (32) et ledit deuxième orifice d'alimentation (34), lesdites première et deuxième soupapes de sélection (60,61) étant aptes à se déplacer par pression dans ledit canal pilote (52).
  7. Ensemble (10) selon la revendication 6, où ledit bloc de soupape (30) définit un premier et un deuxième canal de bloc (40,42), ledit premier canal de bloc (40) s'étendant entre ledit premier orifice d'alimentation (32) et ladite première chambre (36), ledit deuxième canal de bloc (42) s'étendant entre ledit deuxième orifice d'alimentation (34) et ladite deuxième chambre (38).
  8. Ensemble (10) selon la revendication 7, comprenant en outre une soupape bidirectionnelle (54) située à une intersection dudit canal pilote (52), ledit premier canal bloc (40) et ledit deuxième canal bloc (42), ladite soupape bidirectionnelle (54) étant apte à réaliser une communication fluidique entre ledit premier canal bloc (40) et ledit canal pilote (52) lorsque ledit fluide hydraulique s'écoule dans ledit premier orifice d'alimentation (32), et entre ledit deuxième canal bloc (42) et ledit canal pilote (52) lorsque ledit fluide hydraulique s'écoule dans ledit deuxième orifice d'alimentation (34).
  9. Ensemble (10) selon la revendication 8, où ladite soupape bidirectionnelle (54) comprend une soupape à tournant sphérique et à deux voies.
  10. Ensemble (10) selon la revendication 8, où ladite première soupape de sélection (60) comprend:
    a) un boîtier de soupape (62) définissant une extrémité ouverte à proximité dudit canal pilote (52) et une extrémité opposée fermée, ledit boîtier de soupape définissant une chambre de soupape interne (64) communiquant avec ladite extrémité ouverte;
    b) un corps de soupape (66) reçu d'une manière mobile dans ladite chambre de soupape interne (64), ledit corps de soupape (66) définissant une surface de pression (68) à proximité de ladite extrémité ouverte de ladite chambre de soupape interne (64), où ledit corps de soupape (66) est déplacé de ladite première position à ladite deuxième position par une pression dans ledit canal pilote (52) agissant sur ladite surface de pression (68) et
    c) un moyen de sollicitation (74) pour solliciter ledit corps de soupape (66) vers ladite première position.
  11. Ensemble (10) selon la revendication 10, où ledit moyen de sollicitation (74) se situe dans ladite extrémité fermée dudit boîtier de soupape (62).
  12. Ensemble (10) selon la revendication 11, où ledit moyen de sollicitation (74) comprend un ressort.
  13. Ensemble (10) selon la revendication 12, où une pression de 2,17 MPa (315 psi) ou plus grande agissant contre ladite surface de pression (68) est requise pour surmonter la résistance dudit ressort (74).
  14. Ensemble (10) selon la revendication 13, où ledit boîtier de soupape (62) définit une pluralité d'ouvertures (65) agencées circonférentiellement.
  15. Ensemble (10) selon la revendication 14, où ladite deuxième soupape de sélection (61) est sensiblement identique à ladite première soupape de sélection (60).
  16. Ensemble (10) selon la revendication 8, où ledit premier opérateur hydraulique (80) est un positionneur à fourche pour un chariot élévateur, et ledit deuxième opérateur hydraulique (82) est un décaleur latéral pour un chariot élévateur.
  17. Ensemble (10) selon la revendication 12, où ledit bloc de soupape (30) a une forme de boîte, ledit bloc de soupape définissant une première face, une deuxième face et une troisième face.
  18. Ensemble (10) selon la revendication 17, où lesdits premier et deuxième orifices d'alimentation (32, 34) se situent sur ladite première face, lesdits premier et deuxième orifices d'opérateur (44, 46) se situent sur ladite deuxième face et lesdits troisième et quatrième orifices d'opérateur (48,50) se situent sur ladite troisième face.
EP20030701411 2002-03-01 2003-02-14 Ensemble soupape hydraulique multifonctions Expired - Lifetime EP1481168B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US36107502P 2002-03-01 2002-03-01
US361075P 2002-03-01
US10/120,789 US6782910B2 (en) 2002-03-01 2002-04-12 Multi-function hydraulic valve assembly
US120789 2002-04-12
PCT/CA2003/000212 WO2003074884A1 (fr) 2002-03-01 2003-02-14 Ensemble soupape hydraulique multifonctions

Publications (2)

Publication Number Publication Date
EP1481168A1 EP1481168A1 (fr) 2004-12-01
EP1481168B1 true EP1481168B1 (fr) 2009-09-30

Family

ID=27807301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030701411 Expired - Lifetime EP1481168B1 (fr) 2002-03-01 2003-02-14 Ensemble soupape hydraulique multifonctions

Country Status (7)

Country Link
EP (1) EP1481168B1 (fr)
JP (1) JP2005519244A (fr)
CN (1) CN100404882C (fr)
AT (1) ATE444449T1 (fr)
AU (1) AU2003203106A1 (fr)
CA (1) CA2476759C (fr)
DE (1) DE60329471D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014101764A1 (de) * 2014-02-12 2015-08-13 Jungheinrich Aktiengesellschaft Steuerblock für ein Hydrauliksystem eines Flurförderzeugs mit mindestens einem Hydraulikventil

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104803290B (zh) * 2015-04-21 2017-04-12 青岛港国际股份有限公司 一种岸桥提升机构和采用其提升岸桥构件的方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7203122A (fr) * 1972-03-09 1973-09-11
US3782249A (en) * 1972-11-16 1974-01-01 Allis Chalmers Hydraulic control system with locking valve to prevent accidental or unauthorized lowering of a tractor implement
CN1017276B (zh) * 1988-02-17 1992-07-01 通用电气公司 液体多通道转换器
CN1021648C (zh) * 1989-10-04 1993-07-21 日本石油化学株式会社 升降叉车
US5139385A (en) * 1990-04-03 1992-08-18 Swingshift Manufacturing, Inc. Dual pallet fork attachment for a lift truck
FR2720123B1 (fr) * 1994-05-19 1996-08-14 France Power Packer Sa Automatisme de commande hydraulique, notamment pour charrue.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014101764A1 (de) * 2014-02-12 2015-08-13 Jungheinrich Aktiengesellschaft Steuerblock für ein Hydrauliksystem eines Flurförderzeugs mit mindestens einem Hydraulikventil

Also Published As

Publication number Publication date
AU2003203106A1 (en) 2003-09-16
DE60329471D1 (de) 2009-11-12
JP2005519244A (ja) 2005-06-30
CA2476759C (fr) 2011-07-26
CN100404882C (zh) 2008-07-23
CN1639467A (zh) 2005-07-13
CA2476759A1 (fr) 2003-09-12
ATE444449T1 (de) 2009-10-15
EP1481168A1 (fr) 2004-12-01

Similar Documents

Publication Publication Date Title
US4072087A (en) Digital positioner for remote actuation of a control valve
EP0391307B1 (fr) Dispositif de circuit à commande hydraulique pour un vérin à simple effet
EP1434943B1 (fr) Ensemble multisoupape hydraulique possedant un bloc monolithique
JP2007239992A (ja) 複数の圧力リリーフレベルを有する油圧システム
US6212886B1 (en) Hydraulic drive system and directional control valve apparatus in hydraulic machine
US5651390A (en) Pressurized fluid supply system
JP3119722B2 (ja) 圧力比例制御弁による４位置クローズドセンタの切換弁の油圧回路
GB2081394A (en) Hydraulic systems
KR910007287B1 (ko) 유량 제어 기구를 구비한 방향 제어 밸브
US5934406A (en) Jerk control valve for pilot operated steering system
US5115720A (en) Hydraulic valve bank
CN113544390B (zh) 流量控制阀
US6161467A (en) Fluid control system with regeneration
JPS6361524B2 (fr)
US6782910B2 (en) Multi-function hydraulic valve assembly
US11466706B2 (en) Valve device
US3996840A (en) Control circuit of actuator
US5832808A (en) Directional control valve unit
US6186044B1 (en) Fluid control system with float capability
US5209263A (en) Pilot valve assembly
US5081905A (en) Hydraulic pilot operation circuit and valve for quickly discharging oil
KR101911463B1 (ko) 포크 작동 유압장치
EP1481168B1 (fr) Ensemble soupape hydraulique multifonctions
US4099541A (en) Power transmission
US4215622A (en) Hydraulic control system

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: 20040920

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO

R17P Request for examination filed (corrected)

Effective date: 20040920

17Q First examination report despatched

Effective date: 20070809

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 60329471

Country of ref document: DE

Date of ref document: 20091112

Kind code of ref document: P

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

Ref country code: FI

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: 20090930

Ref country code: SE

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: 20090930

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

Ref country code: SI

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: 20090930

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

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: 20100201

Ref country code: CZ

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: 20090930

Ref country code: EE

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: 20090930

Ref country code: ES

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: 20100110

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

Ref country code: SK

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: 20090930

Ref country code: CY

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: 20090930

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

Ref country code: AT

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: 20090930

Ref country code: BE

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: 20090930

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: 20090930

Ref country code: DK

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: 20090930

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

Effective date: 20100701

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: GR

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: 20091231

Ref country code: CH

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

Effective date: 20100228

Ref country code: LI

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

Effective date: 20100228

Ref country code: MC

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

Effective date: 20100301

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: 20100214

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: 20100214

PGRI Patent reinstated in contracting state [announced from national office to epo]

Ref country code: IT

Effective date: 20110616

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20111201 AND 20111207

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 60329471

Country of ref document: DE

Representative=s name: LEINWEBER & ZIMMERMANN, DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 60329471

Country of ref document: DE

Owner name: LIFT TECHNOLOGIES, INC., WESTMINSTER, US

Free format text: FORMER OWNER: LIFT TECHNOLOGIES INC., GUELPH, ONTARIO, CA

Effective date: 20120203

Ref country code: DE

Ref legal event code: R082

Ref document number: 60329471

Country of ref document: DE

Representative=s name: LEINWEBER & ZIMMERMANN, DE

Effective date: 20120203

Ref country code: DE

Ref legal event code: R081

Ref document number: 60329471

Country of ref document: DE

Owner name: LIFT TECHNOLOGIES, INC., US

Free format text: FORMER OWNER: LIFT TECHNOLOGIES INC., GUELPH, CA

Effective date: 20120203

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

Ref country code: BG

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: 20090930

Ref country code: HU

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: 20100401

Ref country code: LU

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

Effective date: 20100214

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

Ref country code: TR

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: 20090930

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 14

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 15

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

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: 20220210

Year of fee payment: 20

Ref country code: DE

Payment date: 20220214

Year of fee payment: 20

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

Ref country code: IT

Payment date: 20220208

Year of fee payment: 20

Ref country code: FR

Payment date: 20220208

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 60329471

Country of ref document: DE

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20230213

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 EXPIRATION OF PROTECTION

Effective date: 20230213