EP3513079B1 - Ventil für einen einfach wirkenden zylinder und dessen eingliederung in einem muldenkipper - Google Patents

Ventil für einen einfach wirkenden zylinder und dessen eingliederung in einem muldenkipper Download PDF

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Publication number
EP3513079B1
EP3513079B1 EP17784394.3A EP17784394A EP3513079B1 EP 3513079 B1 EP3513079 B1 EP 3513079B1 EP 17784394 A EP17784394 A EP 17784394A EP 3513079 B1 EP3513079 B1 EP 3513079B1
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Prior art keywords
valve
shutter
connection
slider
chamber
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EP17784394.3A
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English (en)
French (fr)
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EP3513079A1 (de
Inventor
Ruggero Silimbani
Andrea FORNACIARI
Daniele GAMBERINI
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Interpump Hydraulics SpA
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Interpump Hydraulics SpA
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Priority to PL17784394T priority Critical patent/PL3513079T3/pl
Publication of EP3513079A1 publication Critical patent/EP3513079A1/de
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    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure

Definitions

  • the invention relates to a valve for a hydraulic cylinder group, which is configured to control the oil flow to the hydraulic cylinder of such a group.
  • valve is advantageously applied and placed on the outer jacket of a hydraulic cylinder actuating tipper bodies of vehicles known as "dump trucks".
  • the valves of this type are known and used to control the motion of a cylinder which lifts one side of the tipper body so as to discharge it.
  • the technical problem underlying the present invention is to provide a valve for a hydraulic cylinder group which allows overcoming the drawbacks mentioned above with reference to the prior art.
  • an object of the present invention is to provide an improved valve for controlling the oil flow in a movable cylinder with a simple, rational and rather cost-effective solution.
  • a further object is to provide a valve that is versatile and simple in its installation on hydraulic cylinder groups and in general on the vehicle.
  • the valve comprises an associated limiting device adapted to interact, in turn, with one or more fixed abutment elements during the extension step of the cylinder, typically associated with the lifting of the vehicle's body, and then its relative rotation with respect to a rotation end pin, to which it is normally hinged.
  • the limiting device As a result of the contact with the abutment element, the limiting device is actuated and, as a result of the actuation it sets a pneumatic delivery acting on the valve shutter in communication with the outside, thus interrupting the pneumatic supply.
  • the abutment elements for example are integrally placed on the same support structure as the cylinder rotation pin on which the valve of the present invention is applied. Based on this arrangement, the abutment element is fixed relative to the movement of the cylinder.
  • the limiting device acts as a relief limiting valve of the cylinder stroke in lifting conditions, adapted to vent the pneumatic air once a predefined stroke has been reached by means of a fixed abutment.
  • Another aspect of the invention is to provide a cost-effective limiting device.
  • the limiting device comprises an actuating element configured to interact with the abutment element and sliding in a respective seat.
  • the actuating element is configured to control a respective stem through an interposed first spring.
  • the actuating element, the first spring and the stem are arranged axially aligned in a same cavity of the device.
  • This solution allows an effective actuation of the actuating element and discharge of pressurized chamber of the shutter drive unit.
  • the valve comprises a relief valve, placed longitudinally off axis and in hydraulic connection with the cylinder connection.
  • the relief valve is configured to intervene when the pressure in the cylinder group exceeds the allowed value and is interposed between the connection to the cylinder and the exhaust connection, via a discharge chamber defined between the shutter and the valve body.
  • the shutter allows the discharge of oil in the above chamber by means of a longitudinal portion of a channel inside the shutter, the channel having such a length as to extend up to reaching the discharge connection; then, through a calibrated hole transversely placed and which acts as a bottleneck, a connection is created between the shutter channel and the discharge connection.
  • the shutter allows the discharge of the oil into the discharge chamber by means of one or more lowerings defining respective longitudinal passages on the end shank of the shutter; from the discharge chamber, the oil in over-pressure draws through said openings and goes to discharge.
  • the object of the present invention is also a tipper motor vehicle, of the type comprising at least
  • a hydraulic cylinder group 10 is shown, adapted to be mounted on a commercial vehicle (not shown), such as a tipper, and used for lifting said body.
  • the oil pumped into the body of the cylinder causes the displacement and distancing of the piston and, consequently, such a cylinder group exerts a force in extension, upwards, so as to lift the tipper.
  • the oil drained from the cylinder body by gravity causes the piston to retract into position, thus recalling the cylinder and consequently lowering the tipper.
  • a lifting valve 1 is also provided on the outer jacket 20 of the cylinder, implemented according to the invention.
  • the valve is constrainable to jacket 20 of cylinder 10 by means of a flange 2 or equivalent system. As will be better illustrated herein, the valve is adapted to control the oil flow to the hydraulic cylinder.
  • the hydraulic cylinder is provided with a single hydraulic connection on one side only.
  • valve 1 of the present invention will now be outlined in detail.
  • Valve 1 comprises a valve body 3 comprising an inner wall 30 that defines a shutter cavity 4, which in turn is adapted to receive a shutter 5 sliding lengthwise in said chamber so as to make a seal against the wall of said chamber.
  • the lifting valve 1 further comprises:
  • the shutter cavity 4 and shutter 5 have a longitudinal arrangement; in this way, by sliding to the right or the left (with respect to a neutral position, shown in the figure), the shutter connects a channel, so as to establish according to the cases:
  • the pneumatic drive unit 9 placed at one end 31 of the valve body 3, so that the pneumatic drive unit 9 is in direct connection with a portion of end 31 of said shutter 5.
  • the pneumatic drive unit 9 comprises a tubular jacket 90 that mates with the end portion 31 of the valve body 3 which, to this end, is open. It will be clear that the tubular jacket 90 may also be formed as a single body with the valve body 3.
  • the drive unit 9 is advantageously configured to axially move shutter 5 in the shutter cavity 4 of the valve and define at least three different positions, of which:
  • shutter 5 In the lifting position, shutter 5 is moved to the right while in the lowering position, it is moved to the left, as shown above.
  • the shutter is maintained in a neutral position by a spring M1 against an abutment defined in wall 30.
  • shutter 5 is substantially a stem, worked axially to define recesses and ribs such as to interfere with respective seats into chamber 4 of the valve body 4 and make the connections shown above.
  • this configuration is implemented by the drive unit 9 that, to that end, accommodates one an end of shutter 5 on which a plate 91 is supported that defines a first chamber C1 and a second chamber C2 in the tubular jacket 90.
  • shutter 5 is displaced so that the pump and the cylinder are in communication with the discharge and, therefore, the oil present in the pump is discharged.
  • This configuration is implemented by the drive unit 9 following the supply of compressed air in the second chamber C2, through a corresponding inlet S2, thus inducing a shutter displacement force to the left (with reference to the figures) so as to open both the pump-discharge connection and the connection to the cylinder which is thus also connected to discharge. In this way, the cylinder is recalled by gravity and the body lowers.
  • the lifting valve 1 of the present invention further comprises a limiting device 15 of the pneumatic drive.
  • device 15 is connected to the pneumatic drive unit and is thus also integral with body 3.
  • device 15 is connected to one end of the drive unit 9, opposite to the one connected to body 3.
  • device 15 may be directly connected to body 3, in particular when the drive unit is formed as single body with the valve body 3. Therefore, according to one aspect of the invention, the limiting device 15 defines a closing wall of the end of the drive unit 9 and thus of the valve body 9 and then 3, according to details that will be explained in more detail below.
  • the limiting device 15 can be activated when the drive unit 9 is in the lifting position.
  • the limiting device 15 is configured to:
  • the activation of the limiting device 15 is controlled before reaching the maximum excursion of the cylinder.
  • the activation of the limiting device 15 occurs through contact with one or more fixed abutment elements 17, shown in figure 10 and 11 .
  • the abutment means interfere with the movement of the limiting device.
  • the cylinder is hinged at one end to the vehicle's chassis and at the other to the body.
  • the lifting movement of the body is therefore associated with a rotation of cylinder 20 itself. Since, as noted above, the lifting valve 1 comprising the valve body 3 and the limiting device 15 integral thereto, is fixed to jacket 20 of the cylinder and is therefore also moved during the body lifting.
  • the tipper motor vehicle is also provided, in addition to a hydraulic cylinder adapted to actuate a tipper body, with a lifting valve, both associated with the cylinder group 10 and a fixed abutment element adapted to interact with the valve, in particular with the limiting device 15 of the pneumatic drive.
  • the limiting device 15 comprises at least one actuating element 18, free to slide linearly with respect to an axis AA defined by a respective seat formed by an auxiliary cavity 14.
  • the limiting device also comprises at least a first spring M3, or other elastic device, opposing the inward sliding motion of the actuating element 18, and a slider or drawer 19.
  • the actuating element 18, the first spring M3 and slider or drawer 19 are arranged axially aligned along axis AA in the same cavity 14.
  • device 15 further comprises a second spring M2, or other elastic device, interposed between the actuating element 18 and an abutment surface of slider 19.
  • Spring M3 is arranged on the opposite side to spring M2 and acts on the opposite side of slider 19 so as to recall it in position when the abutment element 17 does not act on the actuating element 18.
  • the purpose of the second spring M2 is to allow an extra stroke of the cylinder and prevent inertial oscillations thereof.
  • a channel 13 is provided, configured to connect place inlet S1 in communication with chamber C1 of the pneumatic drive unit 9. Through channel 13 it is possible to send the air under pressure from inlet S1 to chamber C1, resulting in the displacement of the shutter to the tipping position.
  • slider 19 through springs M2, M3 is positioned so as to leave the channel open and thus the connection between chamber C1 of the drive unit and the air inlet S1.
  • slider 19 advantageously defines a connecting portion 25 comprised between two sealing elements 26 of slider 19 on the auxiliary cavity 14.
  • the air under pressure can be set to discharge.
  • the actuating element 18 and slider 19 act on the perpendicular or more generally, transverse axis AA, or with respect to axis BB of shutter 5.
  • the lifting valve 1 further comprises a relief valve 16, better shown in figures 6 to 8 .
  • the valve As shown in the figure, it is placed preferably longitudinally off axis and in hydraulic connection with the cylinder connection.
  • the valve has an operating axis parallel to that of shutter 5.
  • the relief valve is configured to intervene when the pressure in the cylinder group exceeds the allowed value.
  • the relief valve is interposed between the cylinder connection of group 10 and the discharge connection, passing through a discharge chamber C4 defined between the shutter and the valve body.
  • chamber C4 is arranged axially opposite the drive unit 9, to the advantage of the compactness of the structure.
  • the relief valve is calibrated to open its own shutter when the pressure in the cylinder reaches and exceeds the maximum sealing pressure, Pmax.
  • the discharge of the oil into chamber C4 is allowed by means of one or more lowerings 23 defining respective passages on the end shank 24 of shutter 5; from the discharge chamber C4, the oil in over-pressure draws through the openings defined by lowerings 23 and goes to discharge.
  • a second embodiment is the one shown in figure 7 , which provides for a longitudinal portion of a blind channel 21 formed within and axially to shutter 5; said channel 21 having such a length as to extend up to reaching the discharge zone; then, through a second calibrated hole 22 arranged transversely (acting as a bottleneck), a connection is created between the shutter channel and the discharge channel.
  • shutter 5 allows discharging the oil in chamber C4 by combining a channel 21 and a calibrated hole 22, both inside the shutter.
  • shutter 5 of valve 1 is returned to the center so that the cylinder can be put to safety conditions; this occurs since the discharge chamber C4 is under pressure, due to the presence of the calibrated passage defined by the calibrated holes or by the lowerings.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Claims (18)

  1. Ventil (1) für eine Gruppe von Hydraulikzylindern (10), die dazu ausgelegt sind, den Ölstrom zu einem Zylinder dieser Gruppe von Hydraulikzylindern (10) zu steuern, wobei der Zylinder nur auf einer Seite mit einem einzigen Hydraulikanschluss versehen ist, wobei das Ventil (1) umfasst:
    a. einen Körper (3), der zum Umschließen von einer Wand geeignet ist, die einen Hohlraum (4) eines Verschlusses definiert,
    b. einen Verschluss (5), der in den Hohlraum des Verschlusses (4) gleitet, um eine Abdichtung gegen die Wand des Hohlraums des Verschlusses (4) herzustellen,
    c. einen ersten Anschluss (6) zum Anschluss an eine Pumpe, die zum Fördern eines Ölstroms geeignet ist,
    d. einen zweiten Anschluss (7) zum Verbinden der Hydraulikzylindergruppe (10) mit dem Zylinder,
    e. einen dritten Anschluss (8) zum Anschluss an einen Abfalltank,
    f. eine pneumatische Steuereinheit (9), in der eine erste Kammer (C1) definiert ist, um den Verschluss (5) mittels eines Druckluftstroms axial in den Hohlraum (4) des Verschlusses des Ventils (1) zu bewegen und um mindestens drei verschiedene Positionen, einschließlich einer neutralen Position, einer angehobenen Position und einer abgesenkten Position, zu definieren,
    g. eine Begrenzungsvorrichtung (15), die aktiviert werden kann, wenn sich die Antriebseinheit in einer angehobenen Position befindet und zwischen einer nicht betriebsbereiten Position bewegt werden kann, in der Druckluft von einem Einlass (S1) zur ersten Kammer (C1) zulässig ist, und eine Betriebsposition, in der die erste Kammer (C1) der Antriebseinheit auf Entladung eingestellt und die pneumatische Versorgung des Ventilverschlusses unterbrochen wird,
    dadurch gekennzeichnet, dass die Begrenzungsvorrichtung (15) starr mit der pneumatischen Betätigungseinheit (9) verbunden ist, an einem Ende, in dem die erste Kammer (C1) definiert ist, und dass die Begrenzungsvorrichtung (15) einen Schieber (19) und ein Betätigungselement (18) umfasst, wobei der Schieber (19) beweglich ist, indem er das Betätigungselement (18) gegen ein Betätigungselement (17) stößt, das an einer Stützstruktur der Gruppe von Hydraulikzylindern (10) befestigt werden kann, um die Begrenzungsvorrichtung (15) selektiv in die nicht betriebsbereite Position oder in die Betriebsposition zu bringen.
  2. Ventil nach Anspruch 1, wobei die Begrenzungsvorrichtung (15) einen Hilfshohlraum (14) umfasst, der einen Sitz definiert, in dem der Schieber (19) linear gleiten kann.
  3. Ventil nach Anspruch 2, wobei der Schieber (19) entlang einer Achse (AA) gleitet, die im Wesentlichen senkrecht zu einer Gleitachse des Verschlusses (5) ist.
  4. Ventil nach Anspruch 2 oder 3, wobei der Schieber (19) einen Verbindungsteil (25) definiert, der zwischen zwei Dichtungselementen (26) des Schiebers (19) auf dem Hohlraum (14) angeordnet ist; ein Kanal (13) und der Einlass (S1) sind innerhalb des Hilfshohlraums (14) am Verbindungsteil (25) offen, wenn sich der Schieber (19) im Gleichgewicht befindet, um den Durchgang einer Luftströmung in der ersten Kammer (C1) zu ermöglichen.
  5. Ventil nach einem der vorhergehenden Ansprüche, wobei die Begrenzungsvorrichtung (15) mit einem Ende der Antriebseinheit (9) verbunden ist und eine Schließwand eines Endes der Antriebseinheit (9) definiert.
  6. Ventil nach Anspruch 5, wobei die erste Kammer (C1) in einem rohrförmigen Gehäuse (90) definiert ist, wobei das rohrförmige Gehäuse ein offenes Ende aufweist, das durch die Begrenzungsvorrichtung (15) geschlossen ist.
  7. Ventil nach Anspruch 6, wobei das rohrförmige Gehäuse (90) mit einem Endbereich (31) des Ventilkörpers (3) verbunden ist.
  8. Ventil nach einem der vorhergehenden Ansprüche, wobei die Begrenzungsvorrichtung (15) mindestens eine elastische Vorrichtung (M2, M3) umfasst, die in der Lage ist, den Schieber (19) in der Gleichgewichtsposition zu halten, ohne dass eine Belastung für die Betätigungselement (18) entsteht.
  9. Ventil nach Anspruch 8, wobei die elastische Vorrichtung mindestens eine erste Rückstellfeder (M3) umfasst, die den Schieber (19) in der Gleichgewichtsposition hält; wobei das Betätigungselement (18), die erste Feder (M3) und der Schieber (19) axial ausgerichtet sind.
  10. Ventil nach Anspruch 9, wobei die elastische Vorrichtung eine zweite Feder (M2) umfasst, die zwischen dem Betätigungselement (18) und dem Schieber (19) angeordnet ist; wobei die zweite Feder (M2) angepasst ist, um einen weiteren Hub des Zylinders zu ermöglichen.
  11. Ventil nach einem der vorhergehenden Ansprüche, in dem ein oder mehrere Durchgänge (12, 12A) definiert sind, um die Druckluft aus der ersten Kammer (C1) zu entladen und dann abzulassen; wobei ein oder mehrere Durchgänge (12, 12A) innerhalb des Betätigungselements (18) oder in der Nähe eines Kragens (27) ausgebildet sind, der den Hohlraum (14) schließt und das Betätigungselement (18) hält.
  12. Ventil nach einem der vorhergehenden Ansprüche, umfassend ein Auslassventil (16) in hydraulischer Verbindung mit dem zweiten Anschluss (7) für den Zylinder, wobei das Auslassventil (16) derart konfiguriert ist, dass es eingreift, wenn der Druck in der Zylindergruppe höher als der zulässige Wert ist.
  13. Ventil nach Anspruch 12, wobei das Auslassventil (16) zwischen dem zweiten Anschluss (7) und dem Zylinder und dem dritten Anschluss (8) und dem Ablauf tank durch eine Auslassdüse (C4) angeordnet ist; der Verschluss (5) umfasst einen oder mehrere abgesenkte Teile (23), die entsprechende Durchgänge am Endschaft (24) des Verschlusses (5) definieren, durch die er das Öl in die Auslasskammer (C4) abgibt; wobei der Schaft (24) in Bezug auf den der ersten Kammer (C1) am entgegengesetzten Ende angeordnet ist.
  14. Hydraulikzylinderanordnung (10), umfassend einen Hydraulikzylinder, der ein Gehäuse (20) und ein Ventil (1) gemäß einem der vorhergehenden Ansprüche umfasst, wobei der Körper (3) des Ventils (5) derart starr an dem Gehäuse (20) des Zylinders befestigt ist, dass das Betätigungselement (18) der Begrenzungsvorrichtung (15) aus dem Gehäuse (20) herausragt.
  15. Hydraulikzylinderanordnung (10) nach Anspruch 14, wobei der Verschluss (3) des Ventils (1) entlang einer Richtung quer zur Achse des Zylinders gleiten kann.
  16. Hydraulikzylinderanordnung (10) nach Anspruch 14 oder 15, umfassend eine Stützstruktur für einen Drehstift des Hydraulikzylinders und ein Widerlagerelement, das integral an der Stützstruktur angeordnet ist.
  17. Kraftfahrzeug des Typs, der mindestens umfasst
    a. einen umkippender Körper,
    b. eine Hydraulikzylinderanordnung (10) nach einem der Ansprüche 14 bis 16, die zum Betätigen des umkippenden Körpers geeignet ist,
    c. ein Widerlagerelement (17), das starr an einem Rahmen des Kraftfahrzeugs befestigt und angepasst ist, um mit dem Betätigungselement (18) des Ventils (1) in Wechselwirkung zu treten.
  18. Kraftfahrzeug nach Anspruch 17, wobei das Widerlager (17) derart angeordnet ist, dass es die Bewegung der Begrenzungsvorrichtung (15) während der Drehung des Zylinders der Hydraulikzylinderanordnung (10) stört.
EP17784394.3A 2016-09-16 2017-09-18 Ventil für einen einfach wirkenden zylinder und dessen eingliederung in einem muldenkipper Active EP3513079B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17784394T PL3513079T3 (pl) 2016-09-16 2017-09-18 Zawór do siłownika jednostronnego działania i jego zespół w skrzyni samowyładowczej pojazdu silnikowego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000093580A IT201600093580A1 (it) 2016-09-16 2016-09-16 Valvola per il controllo del flusso di olio a un cilindro semplice effetto e suo assemblaggio in un camion ribaltabile
PCT/IB2017/055631 WO2018051300A1 (en) 2016-09-16 2017-09-18 Valve for a single-acting cylinder and its assembly in a motor vehicle's tipper body

Publications (2)

Publication Number Publication Date
EP3513079A1 EP3513079A1 (de) 2019-07-24
EP3513079B1 true EP3513079B1 (de) 2020-11-25

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EP17784394.3A Active EP3513079B1 (de) 2016-09-16 2017-09-18 Ventil für einen einfach wirkenden zylinder und dessen eingliederung in einem muldenkipper

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Country Link
EP (1) EP3513079B1 (de)
ES (1) ES2850359T3 (de)
IT (1) IT201600093580A1 (de)
PL (1) PL3513079T3 (de)
WO (1) WO2018051300A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182534A (en) * 1977-07-15 1980-01-08 Snyder David M Directional control valve system
DE3239952A1 (de) * 1982-10-28 1984-05-03 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische einrichtung zur hubwerksregelung
DE4017947A1 (de) * 1990-06-05 1991-12-12 Georg Edgar Fa Kippvorrichtung
EP2311686A1 (de) * 2009-10-15 2011-04-20 Hyva International B.V. Ventil für Kippvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
ES2850359T3 (es) 2021-08-27
IT201600093580A1 (it) 2018-03-16
WO2018051300A1 (en) 2018-03-22
EP3513079A1 (de) 2019-07-24
PL3513079T3 (pl) 2021-06-28

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