EP0976929A1 - Hydraulic actuator and control method for a hydraulic side-shifting drive - Google Patents

Hydraulic actuator and control method for a hydraulic side-shifting drive Download PDF

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Publication number
EP0976929A1
EP0976929A1 EP99114568A EP99114568A EP0976929A1 EP 0976929 A1 EP0976929 A1 EP 0976929A1 EP 99114568 A EP99114568 A EP 99114568A EP 99114568 A EP99114568 A EP 99114568A EP 0976929 A1 EP0976929 A1 EP 0976929A1
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EP
European Patent Office
Prior art keywords
hydraulic
check valves
pistons
hydraulic pump
cylinders
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Granted
Application number
EP99114568A
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German (de)
French (fr)
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EP0976929B1 (en
Inventor
Otmar Kaup
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Kaup & Co KG Gesellschaft fur Maschinenbau GmbH
Kaup GmbH and Co KG
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Kaup & Co KG Gesellschaft fur Maschinenbau GmbH
Kaup GmbH and Co KG
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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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
    • 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
    • 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

Definitions

  • the invention relates to a method for controlling a hydraulic Sideshift drive by means of a hydraulic pump and a directional valve, especially for forklifts, with two cylinders in which Pistons displaceable in the same direction are arranged, the inner piston surfaces of which are directed towards each other and their outer ends on one act on common sideshift frame, using hydraulic fluid after reaching the opposite end positions of the pistons is taxed.
  • the invention is therefore based on the object of a method of the beginning Specify the type described with the during operation Venting is carried out as often as required and, if necessary, automatically can be without special vent valves and their Actuation are required.
  • the invention also relates to a hydraulic drive for controlling a Sideshift with a hydraulic pump and a directional valve, in particular for forklift trucks, with two cylinders in which can be moved in the same direction Pistons are arranged, the inner piston surfaces of each other are directed and the outer ends of a common Sideshift frames are enclosed, taking hydraulic fluid after Reachable to reach the opposite end positions of the pistons is.
  • such a hydraulic drive is in accordance with the invention characterized in that the flow between the Cylinder check valves with opposite closing directions are arranged, each of which by the associated piston on inner end of the piston path mechanically from its closed position its open position is reversible, such that the hydraulic fluid through the series-connected check valves in a sump Hydraulic pump is traceable.
  • FIG. 1 shows a cylinder body 1 with two cylinders 2 and 3, in which pistons 4 and 5 are arranged, which as a plunger, but also as Disc pistons with piston rods can be designed as shown in 2 to 4 is shown.
  • the hydraulically effective piston surfaces 4a and 5a are directed towards each other, and the outer ends 4b and 5b are enclosed by a side shift frame 6 through which the Pistons 4 and 5 are always moved in the same direction.
  • a connecting channel 7 is arranged between the two cylinders 2 and 3, in whose both ends in bores of the cylinder body 1 each spring-loaded check valve 8 and 9 is used such that the Closing directions are opposite.
  • the inner piston ends have coaxial plungers 8a and 9a, which are directed towards each other and on the blocking body (balls) of the check valves 8 and 9 in the opening direction act.
  • connection bores 12 and 13 are provided for the hydraulic lines shown in FIGS. 2 to 4 10 and 11.
  • Figure 1 has the left piston 4 at the end of its inward movement its plunger 8a opens the associated check valve 8, and the right piston 5 has - together with the side shift frame 6 outer end position reached.
  • a vehicle-side hydraulic unit 14 has a hydraulic pump 15, which is driven by an electric motor 16.
  • a pressure line 17 In a pressure line 17, a spring-loaded check valve 18 is arranged.
  • the Pressure line 17 leads to a directional control valve 19 of a known type. From Directional control valve 19 leads a return line 20 to a filter 21, which - for the case of filter clogging - a spring-loaded check valve 22 is connected in parallel.
  • a further filter 23 is provided for ventilation.
  • the arrangement is through a tub or sump 24th completed. If there is no hydraulic fluid when the hydraulic pump 15 is running is required, this is controlled via the directional valve 19.
  • a connecting line 25 with a pressure relief valve 26 is used for Limitation of the system pressure.
  • the active connection can be internal (Figure 1) or external (dashed lines in Figures 2 to 4).
  • FIGS 2 to 4 are complete check valves 8 and 9 with their own Tappets 8a and 9a shown as they are commercially available.
  • the left plunger 8a is pressed in by the movement of the piston 4, and the hydraulic fluid flows from the check valve thereby opened 8 via the branch line 28 to line 10 and from here on the directional control valve 19 to the hydraulic unit 14 and its return line 20 back into the swamp 24, as already described.
  • the one described so far Flow pattern is illustrated by arrows in Figure 3.
  • the opposite flow pattern occurs after reversing the directional valve 19 and reaching the opposite position between the Sideshift frame 6 and the cylinder body 1 and is in Figure 4 shown.
  • the right plunger 9a is moved of the piston 5 pressed in, and the hydraulic fluid flows from check valve 9 thereby opened via branch line 27 to Line 11 and from here via the directional valve 19 to the hydraulic unit 14 and its return line 20 back into the sump 24, as already described.
  • the flow pattern is illustrated by arrows in FIG. 4.
  • Figure 2 shows yet another embodiment of the subject matter of the invention:
  • the direction switch 19 is connected in parallel via bypass lines (not specified), a further directional valve 30 which is connected in both directions by an operating switch 31 and two Timers 32 and 33 can be actuated.
  • the operating switch 31 can for example be an " ignition lock" that can be operated with a key. If the operator puts the device into operation, the sideshift moves into one of its end positions, and the directional control valve 30 remains in the same position for a ventilation period of 2 to 4 minutes (empirical value) specified by the respective timer 32 or 33. Thereafter, a reversal into the other end position of the directional control valve 30 and the side shift takes place automatically, whereupon the venting process is repeated with the flow direction reversed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The method is carried out so that by one of the pistons (4,5) at the end of its inward movement, a non return valve (8,9) of the associated cylinders (2,3) is opened against its closed direction mechanically whilst a non return valve (8,9) of the respective other cylinder (2,3) is held open, during the operation duration of the way valve (19), by the working pressure of the hydraulic pump (15) in such a manner. The hydraulic liquid is returned back, through the non-return valves (8,9), connected in series the opposed closing directions, in a sump (34) of the hydraulic pump (15). The way valve (19) is operated, so long until about, gases with hydraulic liquid located in the cylinders (2,3), are led off to the sump (24) of the hydraulic pump (15), in which they are removed from the hydraulic circuit.

Description

Die Erfindung betrifft ein Verfahren zum Steuern eines hydraulischen Seitenschieberantriebs mittels einer Hydraulikpumpe und eines Wegeventils, insbesondere für Gabelstapler, mit zwei Zylindern, in denen gleichsinnig verschiebbare Kolben angeordnet sind, deren innere Kolbenflächen aufeinander zu gerichtet sind und deren äußere Enden auf einen gemeinsamen Seitenschieberrahmen einwirken, wobei Hydraulikflüssigkeit nach Erreichen der jeweils entgegensetzten Endstellungen der Kolben abgesteuert wird.The invention relates to a method for controlling a hydraulic Sideshift drive by means of a hydraulic pump and a directional valve, especially for forklifts, with two cylinders in which Pistons displaceable in the same direction are arranged, the inner piston surfaces of which are directed towards each other and their outer ends on one act on common sideshift frame, using hydraulic fluid after reaching the opposite end positions of the pistons is taxed.

Ein entsprechender Seitenschieberantrieb ist durch die DE 196 02 553 A1 bekannt. Natürlich werden solche Hydraulikantriebe auch vor Inbetriebnahme entlüftet, wofür besondere Entlüftungsventile vorgesehen sind.A corresponding sideshift drive is described in DE 196 02 553 A1 known. Of course, such hydraulic drives are also used before commissioning vented, for which special vent valves are provided.

Nun hat es sich beim Betrieb solcher Seitenschieber herausgestellt, daß nach einiger Betriebdauer Instabiltäten in Form ruckweiser Seitenverschiebungen auftreten. Dies macht sich dann beonders unangenehm bemerkbar, wenn sich eine tonnenschwere Last am oberen Ende eines z.B 8 Meter hohen Hubmastes befindet, wodurch ein instabiles, auf dem Kopf stehendes Massependel gebildet wird. Dadurch ergibt sich ein erhebliches Gefahrenpotential. Als Ursache hierfür hat sich eine Ansammlung von Gasen bzw. Luft im Hydrauliksystem erwiesen.Now it has been found in the operation of such sideshift that after a period of operation instabilities in the form of jerky side shifts occur. This is particularly noticeable if there is a heavy load at the upper end of e.g. 8 meters high mast, causing an unstable, upside down standing pendulum is formed. This results in a considerable amount Danger potential. The cause of this is a cluster of Gases or air proven in the hydraulic system.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Gattung anzugeben, mit dem während des Betriebes beliebig oft und ggf. auch automatisch eine Entlüftung durchgeführt werden kann, ohne daß hierfür besondere Entlüftungsventile und deren Betätigung erforderlich sind.The invention is therefore based on the object of a method of the beginning Specify the type described with the during operation Venting is carried out as often as required and, if necessary, automatically can be without special vent valves and their Actuation are required.

Die Lösung der gestellten Aufgabe erfolgt bei einem Verfahren der eingangs beschriebenen Gattung erfindungsgemäß dadurch, daß

  • a) durch den einen Kolben am Ende seiner Einwärtsbewegung ein Rückschlagventil des zugehörigen Zylinders entgegen seiner Schließrichtung mechanisch geöffnet wird, während ein Rückschlagventil des jeweils anderen Zylinders während der Betätigungsdauer des Wegeventils durch den Arbeitsdruck der Hydraulikpumpe offen gehalten wird, derart, daß die Hydraulikflüssigkeit durch die mit entgegengesetzten Schließrichtungen in Reihe geschalteten Rückschlagventile in einen Sumpf der Hydraulikpumpe zurückgeführt wird, und daß
  • b) das Wegeventil so lange betätigt wird, bis etwa in den Zylindern befindliche Gase mit der Hydraulikflüssigkeit zum Sumpf der Hydraulikpumpe abgeführt werden, in dem sie aus dem Hydraulikkreislauf entfernt werden.
    • The object is achieved in a method of the type described above according to the invention in that
  • a) by the one piston at the end of its inward movement, a check valve of the associated cylinder is mechanically opened against its closing direction, while a check valve of the other cylinder is kept open during the actuation period of the directional valve by the working pressure of the hydraulic pump, such that the hydraulic fluid through the check valves connected in series with opposite closing directions are returned to a sump of the hydraulic pump, and that
  • b) the directional control valve is actuated until gases in the cylinders are discharged with the hydraulic fluid to the sump of the hydraulic pump by removing them from the hydraulic circuit.

    • Durch die erfindungsgemäße Lösung wird die gestellte Aufgabe in vollem Umfang gelöst, d.h., während des Betriebes kann beliebig oft und ggf. auch automatisch eine Entlüftung durchgeführt werden, ohne daß hierfür besondere Entlüftungsventile und deren Betätigung erforderlich sind. Es entsteht auch kein instabiles, auf dem Kopf stehendes Massependel gebildet wird. Dadurch wird eine Gefahrenquelle ausgeschaltet. With the solution according to the invention, the task is fully accomplished Scope solved, i.e. during operation, as often and if necessary venting can also be carried out automatically without this special vent valves and their actuation are required. It there is no unstable, inverted mass pendulum formed becomes. This eliminates a source of danger.

    Es ist dabei besonders vorteilhaft, wenn die Rückschlagventile durch die Kolben am Ende von deren Einwärtsbewegungen mittels Stössel betätigt werden.It is particularly advantageous if the check valves through the Piston operated at the end of their inward movements by means of a tappet become.

    Die Erfindung betrifft auch einen Hydraulikantrieb zum Steuern eines Seitenschiebers mit einer Hydraulikpumpe und einem Wegeventil, insbesondere für Gabelstapler, mit zwei Zylindern, in denen gleichsinnig verschiebbare Kolben angeordnet sind, deren innere Kolbenflächen aufeinander zu gerichtet sind und deren äußere Enden von einem gemeinsamen Seitenschieberrahmen umschlossen sind, wobei Hydraulikflüssigkeit nach Erreichen der jeweils entgegensetzten Endstellungen der Kolben absteuerbar ist.The invention also relates to a hydraulic drive for controlling a Sideshift with a hydraulic pump and a directional valve, in particular for forklift trucks, with two cylinders in which can be moved in the same direction Pistons are arranged, the inner piston surfaces of each other are directed and the outer ends of a common Sideshift frames are enclosed, taking hydraulic fluid after Reachable to reach the opposite end positions of the pistons is.

    Zur Lösung der gleichen Aufgabe ist ein solcher Hydraulikantrieb erfindungsgemäß dadurch gekennzeichnet, daß strömungsmäßig zwischen den Zylindern Rückschlagventile mit entgegengesetzten Schließrichtungen angeordnet sind, von denen jedes durch den zugehörigen Kolben am inneren Ende des Kolbenweges mechanisch aus seiner Schließstellung in seine Öffnungsstellung umsteuerbar ist, derart, daß die Hydraulikflüssigkeit durch die in Reihe geschalteten Rückschlagventile in einen Sumpf der Hydraulikpumpe zurückführbar ist.To achieve the same object, such a hydraulic drive is in accordance with the invention characterized in that the flow between the Cylinder check valves with opposite closing directions are arranged, each of which by the associated piston on inner end of the piston path mechanically from its closed position its open position is reversible, such that the hydraulic fluid through the series-connected check valves in a sump Hydraulic pump is traceable.

    Es ist dabei im Zuge weiterer Ausgestaltungen der Vorrichtung besonders vorteilhaft, wenn - entweder einzeln, oder in Kombination:

    A:
    die Rückschlagventile an den Enden eines Verbindungskanals zwischen den Zylindern angeordnet und durch Stössel betätigbar sind,
    B:
    die Rückschlagventile in Bohrungen des Zylinderkörpers eingesetzt sind, die sich an beiden Enden des Verbindungskanals befinden,
    C:
    die Stössel an den Kolbenflächen angeordnet und aufeinander zu gerichtet sind,
    D:
    die Stössel baulich den Rückschlagventilen zugeordnet und voneinander weg gerichtetet sind.
    In the course of further refinements of the device, it is particularly advantageous if - either individually or in combination:
    A:
    the check valves are arranged at the ends of a connecting channel between the cylinders and can be actuated by tappets,
    B:
    the check valves are inserted in bores of the cylinder body, which are located at both ends of the connecting channel,
    C:
    the tappets are arranged on the piston surfaces and are directed towards one another,
    D:
    the tappets are structurally assigned to the check valves and directed away from each other.

    Ein Ausführungsbeispiel des Erfindungsgegenstandes wird nachfolgend anhand der Figuren 1 bis 4 näher erläutert.An embodiment of the subject matter of the invention is as follows explained in more detail with reference to FIGS. 1 to 4.

    Es zeigen:

    Figur 1
    Einen Axialschnitt durch einen Zylinderkörper mit zwei Kolben,
    Figur 2
    einen Hydraulikschaltplan für den Gegenstand von Figur 1 in Ruhestellung der Kolben,
    Figur 3
    den Hydraulikschaltplan nach Figur 2 in der einen Endstellung der Kolben und
    Figur 4
    den Hydraulikschaltplan nach Figur 2 in der anderen Endstellung der Kolben.
    Show it:
    Figure 1
    An axial section through a cylinder body with two pistons,
    Figure 2
    2 shows a hydraulic circuit diagram for the object of FIG. 1 in the rest position of the pistons,
    Figure 3
    the hydraulic circuit diagram of Figure 2 in one end position of the pistons and
    Figure 4
    the hydraulic circuit diagram of Figure 2 in the other end position of the piston.

    In Figur 1 ist ein Zylinderkörper 1 mit zwei Zylindern 2 und 3 gezeigt, in denen Kolben 4 und 5 angeordnet sind, die als Plunger, aber auch als Scheibenkolben mit Kolbenstangen ausgeführt sein können, wie dies in den Figuren 2 bis 4 gezeigt ist. Die hydraulisch wirksamen Kolbenflächen 4a und 5a sind aufeinander zu gerichtet, und die äusseren Enden 4b und 5b sind von einem Seitenschieberrahmen 6 umschlossen, durch die die Kolben 4 und 5 stets gleichsinnig bewegt werden.1 shows a cylinder body 1 with two cylinders 2 and 3, in which pistons 4 and 5 are arranged, which as a plunger, but also as Disc pistons with piston rods can be designed as shown in 2 to 4 is shown. The hydraulically effective piston surfaces 4a and 5a are directed towards each other, and the outer ends 4b and 5b are enclosed by a side shift frame 6 through which the Pistons 4 and 5 are always moved in the same direction.

    Zwischen den beiden Zylindern 2 und 3 ist ein Verbindungskanal 7 angeordnet, in dessen beide Enden in Bohrungen des Zylinderkörpers 1 je ein federbelastetes Rückschlagventil 8 und 9 derart eingesetzt ist, dass die Schliessrichtungen entgegengesetzt sind. Die inneren Kolbenenden besitzen koaxiale Stössel 8a und 9a, die aufeinander zu gerichtet sind und auf die Sperrkörper (Kugeln) der Rückschlagventile 8 und 9 in Öffnungsrichtung einwirken. Für die - in den Figuren 2 bis 4 gezeigten - Hydraulikleitungen 10 und 11 sind Anschlussbohrungen 12 und 13 vorgesehen. In Figur 1 hat der linke Kolben 4 am Ende seiner Einwärtsbewegung durch seinen Stössel 8a das zugehörige Rückschlagventil 8 geöffnet, und der rechte Kolben 5 hat - zusammen mit dem Seitenschieberrahmen 6 - seine äussere Endstellung erreicht.A connecting channel 7 is arranged between the two cylinders 2 and 3, in whose both ends in bores of the cylinder body 1 each spring-loaded check valve 8 and 9 is used such that the Closing directions are opposite. The inner piston ends have coaxial plungers 8a and 9a, which are directed towards each other and on the blocking body (balls) of the check valves 8 and 9 in the opening direction act. For the hydraulic lines shown in FIGS. 2 to 4 10 and 11, connection bores 12 and 13 are provided. In Figure 1 has the left piston 4 at the end of its inward movement its plunger 8a opens the associated check valve 8, and the right piston 5 has - together with the side shift frame 6 outer end position reached.

    Anhand der Figuren 2 bis 4 wird der Ablauf der Vorgänge wie folgt erläutert:Based on Figures 2 to 4, the sequence of operations is as follows explains:

    Ein fahrzeugseitiges Hydraulikaggregat 14 besitzt eine Hydraulikpumpe 15, die durch einen Elektromotor 16 angetrieben wird. In einer Druckleitung 17 ist ein federbelastetes Rückschlagventil 18 angeordnet. Die Druckleitung 17 führt zu einem Wegeventil 19 bekannter Bauart. Vom Wegeventil 19 führt eine Rücklaufleitung 20 zu einem Filter 21, dem - für den Fall einer Filterverstopfung - ein federbelastetes Rückschlagventil 22 parallel geschaltet ist. Für eine Entlüftung ist ein weiteres Filter 23 vorgesehen. Die Anordnung wird durch eine Wanne bzw. einen Sumpf 24 vervollständigt. Sofern bei laufender Hydraulikpumpe 15 keine Hydraulikflüssigkeit benötigt wird, wird diese über das Wegeventil 19 abgesteuert. Eine Verbindungsleitung 25 mit einem Überdruckventil 26 dient zur Begrenzung des Systemdrucks.A vehicle-side hydraulic unit 14 has a hydraulic pump 15, which is driven by an electric motor 16. In a pressure line 17, a spring-loaded check valve 18 is arranged. The Pressure line 17 leads to a directional control valve 19 of a known type. From Directional control valve 19 leads a return line 20 to a filter 21, which - for the case of filter clogging - a spring-loaded check valve 22 is connected in parallel. A further filter 23 is provided for ventilation. The arrangement is through a tub or sump 24th completed. If there is no hydraulic fluid when the hydraulic pump 15 is running is required, this is controlled via the directional valve 19. A connecting line 25 with a pressure relief valve 26 is used for Limitation of the system pressure.

    Bei einer Stellung der Kolben 4 und 5 und der Rückschlagventile 8 und 9 gemäss den Figuren 1 und 2 und einer entsprechenden Stellung des Wegeventils 19 fliesst Hydraulikflüssigkeit über die Leitung 11 solange zum Zylinder 3, bis die Endstellung von dessen Kolben 5 erreicht ist. Ab diesem Zeitpunkt fliesst die Hydraulikflüssigkeit über eine Zweigleitung 27 und das - sich jetzt automatisch öffnende - Rückschlagventil 9 und den Verbindungskanal 7 zum Rückschlagventil 8, das durch die Bewegung des linken Kolbens 4 zwangsweise in seine Öffnungsstellung gebracht wurde. Vom Rückschlagventil 8 aus fließt die Hydraulikflüssigkeit durch eine Zweigleitung 28 zum Wegeventil 19 und danach zum Sumpf 24 zurück.When the pistons 4 and 5 and the check valves 8 and 9 are in position according to Figures 1 and 2 and a corresponding position of the Directional control valve 19 flows hydraulic fluid over line 11 as long as to cylinder 3 until the end position of its piston 5 is reached. From at this time, the hydraulic fluid flows through a branch line 27 and the - now automatically opening - check valve 9 and Connection channel 7 to the check valve 8, which is caused by the movement of the left piston 4 was forced into its open position. From the check valve 8, the hydraulic fluid flows through a Branch line 28 to the directional control valve 19 and then back to the sump 24.

    Die Schnittstelle zwischen dem Hydraulikantrieb 29 bzw. des von diesem angetriebenen Anbaugeräts, dem sogenannten Seitenschieber, und dem Fahrzeug, das das Hydraulikaggregat 14, die Akkumulatoren und das Anbaugerät trägt, ist durch die strichpunktierte Linie S-S angedeutet.The interface between the hydraulic drive 29 or the latter driven attachment, the so-called sideshift, and the Vehicle that the hydraulic unit 14, the batteries and that Attachment carries, is indicated by the dash-dotted line S-S.

    Die Wirkverbindung kann intern (Figur 1) oder extern (gestrichelte Linien in den Figuren 2 bis 4) erfolgen.The active connection can be internal (Figure 1) or external (dashed lines in Figures 2 to 4).

    In den Figuren 2 bis 4 sind komplette Rückschlagventile 8 und 9 mit eigenen Stösseln 8a und 9a gezeigt, wie sie im Handel erhältlich sind. Gemäß Figur 3 ist der linke Stössel 8a durch die Bewegung des Kolbens 4 eingedrückt, und die Hydraulikflüssigkeit fliesst vom dadurch geöffneten Rückschlagventil 8 über die Zweigleitung 28 zur Leitung 10 und von hier über das Wegeventil 19 zum Hydraulikaggregat 14 und dessen Rücklaufleitung 20 in den Sumpf 24 zurück, wie bereits beschrieben. Der bisher beschriebene Strömungsverlauf ist durch Pfeile in Figur 3 verdeutlicht.In Figures 2 to 4 are complete check valves 8 and 9 with their own Tappets 8a and 9a shown as they are commercially available. According to FIG. 3, the left plunger 8a is pressed in by the movement of the piston 4, and the hydraulic fluid flows from the check valve thereby opened 8 via the branch line 28 to line 10 and from here on the directional control valve 19 to the hydraulic unit 14 and its return line 20 back into the swamp 24, as already described. The one described so far Flow pattern is illustrated by arrows in Figure 3.

    Der entgegensetzte Strömungsverlauf tritt nach Umsteuerung des Wegeventils 19 und Erreichen der entgegengesetzten Stellung zwischen dem Seitenschieberrahmen 6 und dem Zylinderkörper 1 auf und ist in Figur 4 dargestellt. In diesem Fall ist der rechte Stössel 9a durch die Bewegung des Kolbens 5 eingedrückt, und die Hydraulikflüssigkeit fliesst vom dadurch geöffneten Rückschlagventil 9 über die Zweigleitung 27 zur Leitung 11 und von hier über das Wegeventil 19 zum Hydraulikaggregat 14 und dessen Rücklaufleitung 20 in den Sumpf 24 zurück, wie bereits beschrieben. Der Strömungsverlauf ist durch Pfeile in Figur 4 verdeutlicht.The opposite flow pattern occurs after reversing the directional valve 19 and reaching the opposite position between the Sideshift frame 6 and the cylinder body 1 and is in Figure 4 shown. In this case, the right plunger 9a is moved of the piston 5 pressed in, and the hydraulic fluid flows from check valve 9 thereby opened via branch line 27 to Line 11 and from here via the directional valve 19 to the hydraulic unit 14 and its return line 20 back into the sump 24, as already described. The flow pattern is illustrated by arrows in FIG. 4.

    In beiden Fällen wird durch die Hydraulikflüssigkeit in den Zylindern 2 und 3 vorhandenes Gas verdrängt und in Richtung des Sumpfes 24 abgeführt, von wo das Gas ölfrei über den Filter 23 an die Atmosphäre entweichen kann. In beiden Fällen spricht das Überdruckventil 26 nicht an, so dass erhebliche Mengen an Antriebsenergie für die Hydraulikpumpe 15 gespart und dadurch die Ladezyklen für die erforderlichen Akkumulatoren verlängert werden.In both cases, the hydraulic fluid in the cylinders 2 and 3 displaced existing gas and discharged in the direction of the sump 24, from where the gas escapes oil-free via the filter 23 to the atmosphere can. In both cases, the pressure relief valve 26 does not respond, so that considerable amounts of drive energy for the hydraulic pump 15 saved and thereby extends the charging cycles for the required batteries become.

    Figur 2 zeigt noch eine weitere Ausgestaltungsmöglichkeit des Erfindungsgegenstandes: Um eine automatische Zwangsentlüftung bei jeder Inbetriebsetzung des Geräts zu erreichen, ist dem Wegeschalter 19 über nicht näher bezeichnete Bypass-Leitungen ein weiteres Wegeventil 30 parallel geschaltet, das in beiden Richtungen durch einen Betriebsschalter 31 und zwei Zeitglieder 32 und 33 betätigbar ist. Der Betriebsschalter 31 kann beispielsweise ein "Zündschloß" sein, daß mit einen Schlüssel zu betätigen ist. Setzt die Bedienungsperson das Gerät in Betrieb, so fährt der Seitenschieber in eine seiner Endstellungen, und das Wegeventil 30 bleibt für eine durch das jeweilige Zeitglied 32 oder 33 vorgegebene Entlüftungsdauer von 2 bis 4 Minuten (Erfahrungswert) in der gleichen Stellung. Danach erfolgt automatisch eine Umsteuerung in die jeweils andere Endstellung von Wegeventil 30 und Seitenschieber, worauf sich der Entlüfungsvorgang mit umgekehrter Strömungsrichtung wiederholt.Figure 2 shows yet another embodiment of the subject matter of the invention: In order to achieve automatic forced ventilation each time the device is started up, the direction switch 19 is connected in parallel via bypass lines (not specified), a further directional valve 30 which is connected in both directions by an operating switch 31 and two Timers 32 and 33 can be actuated. The operating switch 31 can for example be an " ignition lock" that can be operated with a key. If the operator puts the device into operation, the sideshift moves into one of its end positions, and the directional control valve 30 remains in the same position for a ventilation period of 2 to 4 minutes (empirical value) specified by the respective timer 32 or 33. Thereafter, a reversal into the other end position of the directional control valve 30 and the side shift takes place automatically, whereupon the venting process is repeated with the flow direction reversed.

    Bezugszeichenliste:Reference symbol list:

    11
    ZylinderkörperCylinder body
    22nd
    Zylindercylinder
    33rd
    Zylindercylinder
    44th
    Kolbenpiston
    4a4a
    KolbenflächePiston area
    4b4b
    äußeres Endeouter end
    55
    Kolbenpiston
    5a5a
    KolbenflächePiston area
    5b5b
    äußeres Endeouter end
    66
    SeitenschieberrahmenSideshift frame
    77
    VerbindunsgkanalConnection channel
    88th
    Rückschlagventilcheck valve
    8a8a
    StösselPestle
    99
    Rückschlagventilcheck valve
    9a9a
    StösselPestle
    1010th
    HydraulikleitungHydraulic line
    1111
    HydraulikleitungHydraulic line
    1212th
    AnschlussbohrungConnection hole
    1313
    AnschlussbohrungConnection hole
    1414
    HydraulikaggregatHydraulic unit
    1515
    Hydraulikpumpe hydraulic pump
    1616
    ElektromotorElectric motor
    1717th
    DruckleitungPressure line
    1818th
    Rückschlagventilcheck valve
    1919th
    WegeventilDirectional control valve
    2020th
    RücklaufleitungReturn line
    2121
    Filterfilter
    2222
    Rückschlagventilcheck valve
    2323
    Filterfilter
    2424th
    Sumpfswamp
    2525th
    VerbindungsleitungConnecting line
    2626
    ÜberdruckventilPressure relief valve
    2727
    ZweigleitungBranch line
    2828
    ZweigleitungBranch line
    2929
    HydraulikantriebHydraulic drive
    3030th
    WegeventilDirectional control valve
    3131
    BetriebsschalterOperation switch
    3232
    ZeitgliedTimer
    3333
    ZeitgliedTimer
    S-SS-S
    Schnittstelleinterface

    Claims (8)

    Verfahren zum Steuern eines hydraulischen Seitenschieberantriebs (29) mittels einer Hydraulikpumpe (15) und eines Wegeventils (19), insbesondere für Gabelstapler, mit zwei Zylindern (2, 3), in denen gleichsinnig verschiebbare Kolben (4, 5) angeordnet sind, deren innere Kolbenflächen (4a, 5a) aufeinander zu gerichtet sind und deren äußere Enden auf einen gemeinsamen Seitenschieberrahmen (6) einwirken, wobei Hydraulikflüssikeit nach Erreichen der jeweils entgegensetzten Endstellungen der Kolben (4, 5) abgesteuert wird, dadurch gekernzeichnet, daß a) durch den einen Kolben (4, 5) am Ende seiner Einwärtsbewegung ein Rückschlagventil (8, 9) des zugehörigen Zylinders (2, 3) entgegen seiner Schließrichtung mechanisch geöffnet wird, während ein Rückschlagventil (8, 9) des jeweils anderen Zylinders (2, 3) während der Betätigungsdauer des Wegeventils (19) durch den Arbeitsdruck der Hydraulikpumpe (15) offen gehalten wird, derart, daß die Hydraulikflüssigkeit durch die mit entgegengesetzten Schließrichtungen in Reihe geschalteten Rückschlagventile (8, 9) in einen Sumpf (24) der Hydraulikpumpe (15) zurückgeführt wird, und daß b) das Wegeventil (19) so lange betätigt wird, bis etwa in den Zylindern (2, 3) befindliche Gase mit der Hydraulikflüssigkeit zum Sumpf (24) der Hydraulikpumpe (15) abgeführt werden, in dem sie aus dem Hydraulikkreislauf entfernt werden. Method for controlling a hydraulic sideshift drive (29) by means of a hydraulic pump (15) and a directional control valve (19), in particular for forklift trucks, with two cylinders (2, 3) in which pistons (4, 5) which can be displaced in the same direction are arranged, the interior of which Piston surfaces (4a, 5a) are directed towards each other and their outer ends act on a common side shift frame (6), hydraulic fluid being deactivated after the opposite end positions of the pistons (4, 5) have been reached, characterized in that a) the one piston (4, 5) at the end of its inward movement mechanically opens a check valve (8, 9) of the associated cylinder (2, 3) against its closing direction, while a check valve (8, 9) of the other cylinder ( 2, 3) is kept open during the actuation period of the directional control valve (19) by the working pressure of the hydraulic pump (15), such that the hydraulic fluid through the check valves (8, 9) connected in series with opposite closing directions into a sump (24) Hydraulic pump (15) is returned, and that b) the directional control valve (19) is operated until gases located in the cylinders (2, 3) with the hydraulic fluid are discharged to the sump (24) of the hydraulic pump (15) by removing them from the hydraulic circuit. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Rückschlagventile (8, 9) durch die Kolben (4, 5) am Ende von deren Einwärtsbewegungen mittels Stössel (8a,, 9a) betätigt werden.A method according to claim 1, characterized in that the check valves (8, 9) are actuated by the pistons (4, 5) at the end of their inward movements by means of plungers (8a, 9a). Hydraulikantrieb zum Steuern eines Seitenschiebers mit einer Hydraulikpumpe (15) und einem Wegeventil (19), insbesondere für Gabelstapler, mit zwei Zylindern (2, 3), in denen gleichsinnig verschiebbare Kolben (4, 5) angeordnet sind, deren innere Kolbenflächen (4a, 5a) aufeinander zu gerichtet sind und deren äußere Enden von einem gemeinsamen Seitenschieberrahmen (6) umschlossen sind, wobei Hydraulikflüssikeit nach Erreichen der jeweils entgegensetzten Endstellungen der Kolben (4, 5) absteuerbar ist,
    dadurch gekennzeichnet,
    daß strömungsmäßig zwischen den Zylindern (2, 3) Rückschlagventile (8, 9) mit entgegengesetzten Schließrichtungen angeordnet sind, von denen jedes durch den zugehörigen Kolben (4, 5) am inneren Ende des Kolbenweges mechanisch aus seiner Schließstellung in seine Öffnungsstellung umsteuerbar ist, derart, daß die Hydraulikflüssigkeit durch die in Reihe geschalteten Rückschlagventile (8, 9) in einen Sumpf (24) der Hydraulikpumpe (15) zurückführbar ist.    Hydraulic drive for controlling a sideshift with a hydraulic pump (15) and a directional valve (19), in particular for forklift trucks, with two cylinders (2, 3) in which pistons (4, 5) which can be displaced in the same direction are arranged, the inner piston surfaces (4a, 5a) are directed towards one another and the outer ends of which are enclosed by a common side slide frame (6), hydraulic fluid being controllable after the opposite end positions of the pistons (4, 5) have been reached,
    characterized by
    that flow between the cylinders (2, 3) check valves (8, 9) are arranged with opposite closing directions, each of which can be mechanically reversed from its closed position into its open position by the associated piston (4, 5) at the inner end of the piston path that the hydraulic fluid through the series-connected check valves (8, 9) in a sump (24) of the hydraulic pump (15) can be returned.         Hydraulikantrieb nach Anspruch 3, dadurch gekennzeichnet, daß die Rückschlagventile (8, 9) an den Enden eines Verbindungskanals (7) zwischen den Zylindern (2, 3) angeordnet und durch Stössel (8a, 9a) betätigbar sind.Hydraulic drive according to claim 3, characterized in that the check valves (8, 9) are arranged at the ends of a connecting channel (7) between the cylinders (2, 3) and can be actuated by tappets (8a, 9a). Hydraulikantrieb nach Anspruch 4, dadurch gekennzeichnet, daß die Rückschlagventile (8, 9) in Bohrungen des Zylinderkörpers (1) eingesetzt sind, die sich an beiden Enden des Verbindungskanals (7) befinden.Hydraulic drive according to claim 4, characterized in that the check valves (8, 9) are inserted into bores in the cylinder body (1) which are located at both ends of the connecting channel (7). Hydraulikantrieb nach Anspruch 5, dadurch gekennzeichnet, daß die Stössel (8a, 9a) an den Kolbenflächen (4a, 5a) angeordnet und aufeinander zu gerichtet sind. Hydraulic drive according to Claim 5, characterized in that the tappets (8a, 9a) are arranged on the piston surfaces (4a, 5a) and are directed towards one another. Hydraulikantrieb nach Anspruch 5, dadurch gekennzeichnet, dass die Stössel (8a, 9a) baulich den Rückschlagventilen (8, 9) zugeordnet und voneinander weg gerichtetet sind.Hydraulic drive according to claim 5, characterized in that the plungers (8a, 9a) are structurally assigned to the check valves (8, 9) and directed away from one another. Hydraulikantrieb nach Anspruch 5, dadurch gekennzeichnet, dass dem Wegeventil (19) über Bypass-Leitungen ein weiteres Wegeventil (30) parallel geschaltet ist, das in beiden Richtungen durch einen Betriebsschalter (31) und zwei Zeitglieder (32, 33) betätigbar ist.Hydraulic drive according to claim 5, characterized in that the directional control valve (19) is connected in parallel via bypass lines, a further directional control valve (30) which can be actuated in both directions by an operating switch (31) and two timing elements (32, 33).
    EP99114568A 1998-07-29 1999-07-24 Hydraulic actuator and control method for a hydraulic side-shifting drive Expired - Lifetime EP0976929B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19834149A DE19834149C2 (en) 1998-07-29 1998-07-29 Method for controlling a hydraulic sideshift drive and hydraulic drive therefor
    DE19834149 1998-07-29

    Publications (2)

    Publication Number Publication Date
    EP0976929A1 true EP0976929A1 (en) 2000-02-02
    EP0976929B1 EP0976929B1 (en) 2003-12-03

    Family

    ID=7875715

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP99114568A Expired - Lifetime EP0976929B1 (en) 1998-07-29 1999-07-24 Hydraulic actuator and control method for a hydraulic side-shifting drive

    Country Status (4)

    Country Link
    EP (1) EP0976929B1 (en)
    AT (1) ATE255686T1 (en)
    DE (2) DE19834149C2 (en)
    ES (1) ES2212424T3 (en)

    Cited By (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN106438529A (en) * 2016-11-07 2017-02-22 安徽理工大学 Synchronous double-braking hydraulic system of mining monorail crane travelling mechanism
    CN106938822A (en) * 2016-11-07 2017-07-11 安徽理工大学 A kind of semi-automatic mining monorail crane step forward walking mechanism hydraulic system of synchronous double brake type
    CN113120812A (en) * 2017-01-17 2021-07-16 雷蒙德股份有限公司 Variable hydraulic pressure unloading system and method for a materials handling vehicle

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    US3703849A (en) * 1970-06-13 1972-11-28 Ver Flugtechnische Werke Multiple unit, hydraulic actuator
    EP0506158A2 (en) * 1991-03-01 1992-09-30 Trioliet Mullos B.V. Device for taking out and distributing ensilage material
    WO1993020354A1 (en) * 1992-03-30 1993-10-14 Sjoerd Meijer Hydraulic device with synchronous jacks
    DE19602553A1 (en) * 1996-01-25 1997-07-31 Kaup Gmbh & Co Kg Pressure medium drive with a cylinder and a plunger

    Family Cites Families (2)

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    Publication number Priority date Publication date Assignee Title
    DE3603016A1 (en) * 1986-01-31 1987-08-06 Oerlikon Boehringer Gmbh Flushing valve
    DE19627974C2 (en) * 1996-07-11 2003-02-06 Getrag Getriebe Zahnrad Hydraulic actuator and method for bleeding a hydraulic actuator

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    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3703849A (en) * 1970-06-13 1972-11-28 Ver Flugtechnische Werke Multiple unit, hydraulic actuator
    EP0506158A2 (en) * 1991-03-01 1992-09-30 Trioliet Mullos B.V. Device for taking out and distributing ensilage material
    WO1993020354A1 (en) * 1992-03-30 1993-10-14 Sjoerd Meijer Hydraulic device with synchronous jacks
    DE19602553A1 (en) * 1996-01-25 1997-07-31 Kaup Gmbh & Co Kg Pressure medium drive with a cylinder and a plunger

    Cited By (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN106438529A (en) * 2016-11-07 2017-02-22 安徽理工大学 Synchronous double-braking hydraulic system of mining monorail crane travelling mechanism
    CN106938822A (en) * 2016-11-07 2017-07-11 安徽理工大学 A kind of semi-automatic mining monorail crane step forward walking mechanism hydraulic system of synchronous double brake type
    CN113120812A (en) * 2017-01-17 2021-07-16 雷蒙德股份有限公司 Variable hydraulic pressure unloading system and method for a materials handling vehicle
    CN113120812B (en) * 2017-01-17 2022-06-14 雷蒙德股份有限公司 Variable hydraulic pressure unloading system and method for a materials handling vehicle

    Also Published As

    Publication number Publication date
    ES2212424T3 (en) 2004-07-16
    DE19834149C2 (en) 2003-12-11
    EP0976929B1 (en) 2003-12-03
    DE19834149A1 (en) 2000-02-10
    DE59907917D1 (en) 2004-01-15
    ATE255686T1 (en) 2003-12-15

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