EP1111247B1 - Hydraulic power system with two pumps - Google Patents
Hydraulic power system with two pumps Download PDFInfo
- Publication number
- EP1111247B1 EP1111247B1 EP20000127327 EP00127327A EP1111247B1 EP 1111247 B1 EP1111247 B1 EP 1111247B1 EP 20000127327 EP20000127327 EP 20000127327 EP 00127327 A EP00127327 A EP 00127327A EP 1111247 B1 EP1111247 B1 EP 1111247B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- control valve
- power system
- switch
- hydraulic power
- 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
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2282—Systems using center bypass type changeover valves
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- 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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
- F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
Definitions
- the invention relates to a working hydraulic system for a farm tractor with a hoist, according to the generic term of claim 1.
- this is between the neutral circulation and the oil socket provided first control valve directly by means of an operating element and that between the other neutral circulation line and the Oil socket provided second control valve electrically operated and switchable by means of a first switch, wherein Sensors on the control unit with a coupling switch are connected, the same switching directions of the two Control valves for the oil socket ensures (claim 4).
- This allows interconnecting the branches via a simple electrical switch.
- the coupling switch Make sure the two are the oil outlet supplying branches do not work against each other.
- the first switch on the control element attached so that he served together with this can be (claim 5).
- the second control valve by means of a second switch controllable be when the actuator for the first control valve is not actuated (claim 6). So can the second Branch alone to preselect the position or movement used the supplied via the oil socket attachment become. To prevent incorrect operation, the Coupling switch only the connection between the second Switch and the second control valve ago, when in Neutral position is located (claim 7). It will be an advantage provided as a second switch, a three-position switch (Claim 8). That allows a simple and good adjustable fine control.
- Fig. 1 In the hydraulic diagram of Fig. 1 is the standard control block with 1 and the additional additional control block denoted by 2. The latter can be both as a WunschausScienceuiig retrofitted, as well as with the standard control block 1 be united into a single block.
- the first standard control block 1 is a (first) constant displacement pump 3 and the another control block another (second) Constantpumpe 4th assigned.
- a control block 5 for a hoist 6 is only indicated without details, since not affected by the invention.
- the standard control block 1 consists of a first Connection plate 10 with a pressure relief valve 11, a Valve plate 12 with an example, mechanically operated control valve 13 of the type 6/3 or 6/4 (the Floating position is omitted for simplicity), as in Such hydraulic systems in use, with a connection 14 to a consumer, not shown, further from a valve plate 15 with a here mechanically actuated first control valve 16, also of type 6/3 for a first parallel oil feed branch 17 to an oil outlet 18, further from one the entire standard control block 1 passing through neutral circulation line 20, and a to an oil sump 22 open return 21st
- the additional control block 2 consists of a second Connection plate 30 with a pressure relief valve 31, a valve plate 32 with a second electrically operated Control valve 33 type 6/3 for a second parallel Branch 34 for the supply of the oil socket 18.
- the oil socket 18 is thus of the two parallel oil supply branches 17, 34, controlled by the first control valve 16 and fed by the second control valve 33.
- the second control valve 33 is electrically operated, including the two control lines 35, 36, each for a direction of movement provided are.
- the control block 2 still contains a valve plate 37 with an example mechanically operated Control valve type 6/3 to a terminal 39 for a other consumers.
- the additional control block 2 is from a second neutral circulation line 40 passes through and has another return 41, which also to the oil sump 22nd is open.
- the additional control block 2 is also provided with an end plate 42 in which the neutral circulation line is diverted.
- Essential and of special interest is the oil outlet 18 with their two in parallel switched oil supply branches 17, 34 and the first control valve 16 and the second control valve 33.
- the first Control valve 16 is here by means of a connecting rod operated directly by an operating lever 51, wherein the Connection could also be hydraulic.
- This operating lever 51 has on its handle a push-button formed first switch 52 and two motion sensors with sensor signal line 53, 54 which one the direction of movement provide the signal indicative of the operating lever 51.
- a second Switch 55 is provided, which, designed as a three-position switch, acts on the second control valve 33 (see Fig. 2).
- FIG. 2 shows the electrical actuation of the second Control valve 33 schematically.
- the second control valve 33 In the picturedii position the second control valve 33 is closed, the oil outlet 18 is only on the first oil inlet branch 17 and the first control valve 16, controlled by the operating lever 51, supplied. Since the first switch 52 is not actuated is, it is open, all subsequent switches are de-energized.
- the first switch is followed by a coupling switch 57, by means of the sensor signals of the signal lines 53, 54 (see Fig. 1) and coils 58, 59 in three different Positions (a, b, c) can be brought.
- sensor line 54 provides a signal to the coil 59, whereby the coupling switch in the position a and the second control valve 33 in the same position as the first Control valve 16 is brought. Analogous to the actuation of the Operating lever in the other direction.
- the first switch 52 could also be triggered automatically by an in various ways conceivable and not shown Sensor be connected.
- the second switch (the three-position switch) 55 off Fig. 1 is found in Fig. 2 again. He is only in the Circuit switched when the coupling switch 57 in the neutral position B is located, so if the operating lever 51 is not actuated. Only then, for example, to Fine adjustment via the second switch 55, the second Control valve 33 are moved. Thanks to this priority circuit it is impossible to accidentally use the first control valve 16 in the "raise” position and the second control valve 33 is simultaneously in the "lower" position.
Description
Die Erfindung handelt von einem Arbeitshydrauliksystem
für einen Ackerschlepper mit einem Hubwerk, nach dem Oberbegriff
des Anspruchs 1.The invention relates to a working hydraulic system
for a farm tractor with a hoist, according to the generic term
of
Derartige Hydrauliksysteme sind aus der Praxis bekannt und allgemein üblich (siehe z.B. EP108347). Ihre einzige Konstantpumpe ist bei vielen Verbrauchern sehr groß, bzw. muss für einige spezielle Verbraucher besonders groß sein, ist aber nur selten ganz ausgelastet. Dadurch sind die Verluste beträchtlich. Die für die maximale Fördermenge dimensionierte Neutralumlaufleitung erfordert sehr große und daher teure Ventile. Das gilt in besonders hohem Maße für das Hubwerks-Regelventil.Such hydraulic systems are known from practice and commonplace (see, e.g., EP108347). Your only constant pump is at many consumers very large, or must for some special Consumers are particularly tall, but is rare very busy. As a result, the losses are considerable. The rated for the maximum flow neutral circulation pipe requires very large and therefore expensive valves. This is especially true for the hoist control valve.
Unter einer Ölsteckdose wird ein am Fahrzeug angebrachter Steckanschluss für Druckschläuche zu einem externen Verbraucher, etwa einem Frontlader, klappbaren Bodenbearbeitungsgeräten oder einer Kehrmaschine, verstanden. Der von solchen externen Verbrauchern benötigte Ölstrom kann sehr verschieden und kurzzeitig oder kontinuierlich sein. Das erfordert eine weitere Vergrößerung der Komponenten des Systemes, trotzdem reicht das Angebot oft nicht aus. Bisweilen hilft man sich durch funktionelle Vermischung des Hydrauliksystemes mit dem der Getriebeschaltung oder der Lenkung. Das aber verkompliziert die Systeme, verlängert die Verbindungswege, macht sie störungsanfällig und erfordert einen gemeinsamen Ölhaushalt.Under an oil socket is attached to the vehicle Plug connection for pressure hoses to an external Consumer, such as a front loader, folding tillage equipment or a sweeper, understood. Of the Oil flow required by such external consumers can be very different and short-term or continuous. This requires a further enlargement of the components of the Systemes, nevertheless, the offer is often not enough. from time to time helps one by functional mixing of the Hydraulic system with the transmission circuit or the Steering. But that complicates the systems, extended the connection paths, makes them prone to failure and requires a common oil budget.
Besondere Schwierigkeiten bereitet es, wenn zur Normalausführung eines Fahrzeuges als Wunschausführung die Anschlussmöglichkeit für weitere Verbraucher beziehungsweise die Aufrüstung für einen größeren Ölstrom an der Ölsteckdose vorzusehen ist.Special difficulties it prepares, if to the normal execution a vehicle as a wish execution the Connection option for other consumers or the upgrade for a larger oil flow at the oil outlet is to be provided.
Es ist daher Aufgabe der Erfindung, ein gattungsgemäßes System vorzuschlagen, das bei geringsten Kosten und Leistungsverlusten an mindestens einer der Ölsteckdosen eine Anpassung des verfügbaren Ölstromes erlaubt, und wenn möglich als Zusatzausrüstung verfügbar ist.It is therefore an object of the invention to provide a generic System to propose that at the lowest cost and Power losses on at least one of the oil sockets allows an adjustment of the available oil flow, and if possible as additional equipment is available.
Erfindungsgemäß wird das gemäss den Merkmalen des Anspruchs 1 erreicht.According to the invention that is achieved according to the features of
So wird ein Zweikreis-System geschaffen. Das hat den Vorteil, dass kleinere und billigere Komponenten verwendet werden können. Weiters können die beiden Kreise, weil voneinander unabhängig versorgt, verschieden ausgelegt sein; etwa einer als "Loadsensing"-Kreis und der andere als "Open center"-Kreis, wobei dann der Loadsensing-Kreis gerade so viel Öl liefert, dass der benötigte Ölstrom erreicht wird. Ausserdem kann der zweite Kreis als Wunschausführung leicht hinzugefügt werden. Die parallele Anspeisung und unabhängige Ansteuerung der Ölsteckdose schließlich erlaubt, den dort verfügbaren Ölstrom dem Anbaugerät anzupassen, ohne Leistung verdrosseln zu müssen. Diese Anpassung ist besonders flexibel, wenn die beiden Konstantpumpen verschiedene Förderkapazitäten haben (Anspruch 2). So kann die Ölsteckdose wahlweise entweder von dem einen oder dem anderen Kreis oder von beiden Kreisen versorgt werden.This creates a two-circuit system. That has that Advantage that uses smaller and cheaper components can be. Furthermore, the two circles, because of each other be supplied independently, designed differently; one as a load-sensing circuit and the other as open center "circle, in which case the load-sensing circuit is just like that a lot of oil provides that the required oil flow is achieved. In addition, the second circle as a wish execution easily to be added. The parallel feed and independent Activation of the oil socket finally allowed the available oil flow to adapt to the attachment, without To choke power. This customization is special flexible, if the two constant pumps are different Funding capacities have (claim 2). So can the oil outlet optionally either one or the other Circle or be supplied by both circles.
Wenn die diversen Verbraucher in Reihenschaltung an die Neutralumlautleitungen angeschlossen sind, ist eine weitere Verbesserung der Ölversorgung der Ölsteckdose dadurch zu erreichen, dass mindestens eines der beiden Steuerventile für die Ölsteckdose in seiner Neutralumlaufleitung an erster Stelle angeordnet ist (Anspruch 3). So wird die Ölsteckdose mit Priorität versorgt.When the various consumers connected in series the neutral umlauts are connected is one further improvement of the oil supply of the oil socket thereby to achieve that at least one of the two control valves for the oil socket in its neutral circulation line is arranged in the first place (claim 3). So will the oil socket is given priority.
In einer bevorzugten Ausführungsform ist das zwischen der Neutralumlaufleitting und der Ölsteckdose vorgesehene erste Steuerventil direkt mittels eines Bedienungsorganes und das zwischen der weiteren Neutralumlaufleitung und der Ölsteckdose vorgesehene zweite Steuerventil elektrisch betätigt und mittels eines ersten Schalters zuschaltbar, wobei Sensoren am Bedienungsorgan mit einem Koppelschalter verbunden sind, der gleiche Schaltrichtungen der beiden Steuerventile für die Ölsteckdose sicherstellt (Anspruch 4). Das ermöglicht ein Zusammenschalten der Zweige über einen einfachen elektrischen Schalter. Der Koppelschalter stellt sicher, dass die beiden die Ölsteckdose versorgenden Zweige nicht gegeneinander arbeiten.In a preferred embodiment, this is between the neutral circulation and the oil socket provided first control valve directly by means of an operating element and that between the other neutral circulation line and the Oil socket provided second control valve electrically operated and switchable by means of a first switch, wherein Sensors on the control unit with a coupling switch are connected, the same switching directions of the two Control valves for the oil socket ensures (claim 4). This allows interconnecting the branches via a simple electrical switch. The coupling switch Make sure the two are the oil outlet supplying branches do not work against each other.
Praktischerweise ist der erste Schalter am Bedienungselement angebracht, sodass er mit diesem gemeinsam bedient werden kann (Anspruch 5). Dadurch kann der zweite Zweig dazugeschaltet werden, ohne die Aufmerksamkeit von der gerade ausgeführten Arbeit abzuwenden, wenn sich die vom ersten Zweig der Ölsteckdose zugeführte Ölmenge als zu klein erweist.Conveniently, the first switch on the control element attached so that he served together with this can be (claim 5). This allows the second branch be switched on, without the attention of the straight avert the work performed when the first Branch of oil socket supplied amount of oil as too small proves.
In Weiterbildung des Erfindungsgedankens kann das zweite Steuerventil mittels eines zweiten Schalters steuerbar sein, wenn das Betätigungsorgan für das erste Steuerventil nicht betätigt ist (Anspruch 6). So kann der zweite Zweig alleine zur Vorwahl der Stellung oder der Bewegung des über die Ölsteckdose belieferten Anbaugerätes eingesetzt werden. Um Fehlbedienungen zu verhindern, stellt der Koppelschalter nur dann die Verbindung zwischen dem zweiten Schalter und dem zweiten Steuerventil her, wenn er sich in Neutralstellung befindet (Anspruch 7). Dabei wird mit Vorteil als zweiter Schalter ein Drei-Stellungs-Schalter vorgesehen (Anspruch 8). Das erlaubt eine einfache und gut dosierbare Feinsteuerung.In development of the inventive concept, the second control valve by means of a second switch controllable be when the actuator for the first control valve is not actuated (claim 6). So can the second Branch alone to preselect the position or movement used the supplied via the oil socket attachment become. To prevent incorrect operation, the Coupling switch only the connection between the second Switch and the second control valve ago, when in Neutral position is located (claim 7). It will be an advantage provided as a second switch, a three-position switch (Claim 8). That allows a simple and good adjustable fine control.
In Weiterbildung der Erfindung kann schließlich noch vorgesehen sein, dass das zweite Steuerventil bei steigender Anforderung an den Ölstrom an der Ölsteckdose automatisch geöffnet wird (Anspruch 9).In a further development of the invention may finally be provided that the second control valve with increasing Requirement for the oil flow at the oil socket automatically is opened (claim 9).
Im folgenden wird die Erfindung anhand von Abbildungen
beschrieben und erläutert.
Es stellen dar:
- Fig. 1
- ein Schema eines Ausführungsbeispieles des erfindungsgemäßen Hydrauliksystemes;
- Fig. 2
- ein elektrisches Schaltschema eines Teiles der Betätigungsmittel.
They show:
- Fig. 1
- a diagram of an embodiment of the hydraulic system according to the invention;
- Fig. 2
- an electrical schematic of a portion of the actuating means.
In dem Hydraulikschema der Fig. 1 ist der Standardsteuerblock
mit 1 und der weitere zusätzliche Steuerblock
mit 2 bezeichnet. Letzterer kann sowohl als Wunschausführuiig
nachgerüstet, als auch mit dem Standardsteuerblock 1
zu einem einheitlichen Block vereint sein. Dem ersten Standardsteuerblock
1 ist eine (erste) Konstantpumpe 3 und dem
weiteren Steuerblock eine weitere (zweite) Konstantpumpe 4
zugeordnet. Ein Steuerblock 5 für ein Hubwerk 6 ist nur
ohne Details angedeutet, da von der Erfindung nicht betroffen.In the hydraulic diagram of Fig. 1 is the standard control block
with 1 and the additional additional control block
denoted by 2. The latter can be both as a Wunschausführuiig
retrofitted, as well as with the
Der Standardsteuerblock 1 besteht aus einer ersten
Anschlußplatte 10 mit einem Druckbegrenzungsventil 11, einer
Ventilplatte 12 mit einem beispielsweise mechanisch
betätigten Steuerventil 13 vom Typ 6/3 oder 6/4 (wobei die
Schwimmstellung zur Vereinfachung weggelassen ist), wie in
derartigen Hydrauliksystemen gebräuchlich, mit einer Verbindung
14 zu einem nicht dargestellten Verbraucher, weiters
aus einer Ventilplatte 15 mit einem hier mechanisch
betätigten ersten Steuerventil 16, auch vom Typ 6/3 für
einen ersten parallelen Ölzulaufzweig 17 zu einer Ölsteckdose
18, weiters aus einer den gesamten Standardsteuerblock
1 durchziehenden Neutralumlaufleitung 20, und einem
zu einem Ölsumpf 22 offenen Rücklauf 21.The
Der zusätzliche Steuerblock 2 besteht aus einer zweiten
Anschlußplatte 30 mit einem Druckbegrenzungsventil 31,
einer Ventilplatte 32 mit einem zweiten elektrisch betätigten
Steuerventil 33 vom Typ 6/3 für einen zweiten parallelen
Zweig 34 zur Versorgung der Ölsteckdose 18. Die Ölsteckdose
18 wird somit von den beiden parallelen Ölzulaufzweigen
17, 34, gesteuert vom ersten Steuerventil 16 und
vom zweiten Steuerventil 33 gespeist. Das zweite Steuerventil
33 ist elektrisch betätigt, wozu die beiden Steuerleitungen
35, 36, jeweils für eine Bewegungsrichtung, vorgesehen
sind. Weiters enthält der Steuerblock 2 noch eine Ventilplatte
37 mit einem beispielsweise mechanisch betätigten
Steuerventil vom Typ 6/3 zu einem Anschluß 39 für einen
weiteren Verbraucher. Der zusätzliche Steuerblock 2 ist von
einer zweiten Neutralumlaufleitung 40 durchsetzt und besitzt
einen weiteren Rücklauf 41, der ebenso zum Ölsumpf 22
geöffnet ist. Der zusätzliche Steuerblock 2 ist ebenfalls
mit einer Endplatte 42 versehen, in der die Neutralumlaufleitung
umgelenkt wird. Wesentlich und vom besonderen Interesse
ist die Ölsteckdose 18 mit ihren beiden parallel
geschalteten Ölzulaufzweigen 17, 34 und dem ersten Steuerventil
16 sowie dem zweiten Steuerventil 33. Das erste
Steuerventil 16 wird hier mittels eines Verbindungsgestänges
direkt von einem Bedienungshebel 51 betätigt, wobei die
Verbindung auch hydraulisch sein könnte. Dieser Bedienungshebel
51 besitzt an seinem Handgriff einen als Tastschalter
ausgebildeten ersten Schalter 52 und zwei Bewegungssensoren
mit Sensorsignalleitung 53, 54 die ein die Bewegungsrichtung
des Bedienungshebels 51 kennzeichnendes Signal bereitstellen.
Schließlich ist irgendwo auf der Bedienungsoberfläche
oder in der Nähe des Bedienungshebels 51 ein zweiter
Schalter 55 vorgesehen, der, als Dreistellungsschalter ausgebildet,
auf das zweite Steuerventil 33 wirkt (siehe
Fig. 2).The
Fig.2 zeigt die elektrische Betätigung des zweiten
Steuerventiles 33 schematisch. In der abgebildeteii Stellung
ist das zweite Steuerventil 33 geschlossen, die Ölsteckdose
18 wird nur über den ersten Ölzulaufzweig 17 und
das erste Steuerventil 16, gesteuert vom Bedienungshebel
51, beliefert. Da der erste Schalter 52 nicht betätigt
ist, ist er geöffnet, alle darauf folgenden Schalter sind
stromlos. Auf den ersten Schalter folgt ein Koppelschalter
57, der mittels der Sensorsignale der Signalleitungen
53, 54 (siehe Fig. 1) und Spulen 58, 59 in drei verschiedene
Stellungen (a, b, c) bringbar ist. Wird der Bedienungshebel
51 nicht bewegt, so ist keine der beiden Spulen 58,
59 unter Strom und der Koppelschalter 57 befindet sich in
der Neutralstellung b, es fließt kein Strom zu einer der
beiden Ansteuerspulen 60, 61 des zweiten Steuerventiles 33,
es bleibt somit geschlossen.2 shows the electrical actuation of the
Wird der Bedleiiungsliebei 51 in einer Richtung bewegt,
liefert die Sensorleitung 54 ein Signal an die Spule
59, wodurch der Koppelschalter in die Stellung a und das
zweite Steuerventil 33 in dieselbe Stellung wie das erste
Steuerventil 16 gebracht wird. Analog bei Betätigung des
Bedienungshebels in die andere Richtung. Der erste Schalter
52 könnte auch automatisch, ausgelöst durch einen in
verschiedenster Weise denkbaren und nicht dargestellten
Sensor beschaltet sein.If the
Der zweite Schalter (der Dreistellungsschalter) 55 aus
Fig. 1 findet sich in Fig. 2 wieder. Er ist nur dann in den
Stromkreis geschaltet, wenn sich der Koppelschalter 57 in
der Neutralstellung B befindet, also wenn der Bedienungshebel
51 nicht betätigt ist. Nur dann kann beispielsweise zur
Feineinstellung über den zweiten Schalter 55 das zweite
Steuerventil 33 bewegt werden. Dank dieser Prioritätsschaltung
ist es unmöglich, dass versehentlich das erste Steuerventil
16 in der Stellung "heben" und das zweite Steuerventil
33 gleichzeitig in der Stellung "senken" ist. The second switch (the three-position switch) 55 off
Fig. 1 is found in Fig. 2 again. He is only in the
Circuit switched when the
Insgesamt wird somit Dank der Erfindung nicht nur ein höherer Wirkungsgrad und eine größere Freiheit bei der Gestaltung des Hydrauliksystemes, sondern auch ein erhöhter Bedienungskomfort bei absoluter Sicherheit erreicht.Overall, therefore, thanks to the invention is not only a higher efficiency and greater freedom of design of the hydraulic system, but also an elevated one Operating comfort achieved with absolute safety.
Claims (9)
- Hydraulic power system for a tractor with a lifting gear, various consumers and at least one oil socket (18) for driving a mounted implement, and with a fixed-displacement pump (3) which delivers hydraulic fluid into a neutral circulation line (20) which supplies the various consumers via control valves and the at least one oil socket (18) via a first control valve (16), and with a further fixed-displacement pump (4) which likewise supplies the oil socket (18) with hydraulic fluid via a further neutral circulation line (40) and a second control valve (33), wherein the control valves (16, 33) in the parallel oil feed branches (17, 34) leading to the oil socket (18) can be switched independently of one another, characterised in that the control valves (16, 33) can be switched such that the oil socket (18) is supplied either by the one or the other neutral circulation line (20, 40) or by both neutral circulation lines (20, 40), wherein a coupling switch ensures that the two branches (17, 34) supplying the oil socket do not operate in opposition in that the control valves (16, 33) have the same switching direction for the oil socket (18).
- Hydraulic power system according to Claim 1, characterised in that the two fixed-displacement pumps (3, 4) have different delivery capacities.
- Hydraulic power system according to Claim 1, in which the various consumers (14, 18, 39) are connected to the neutral circulation lines (20, 40) in a series connection, characterised in that at least one of the two control valves (16, 33) for the oil socket (18) is preferably disposed after the pump (3, 4) in its neutral circulation line (20; 40).
- Hydraulic power system according: to Claim 1, characterised in that the first control valve (16), which is provided between the neutral circulation line (20) and the oil socket (18), is actuated directly by means of an operating member (51), and the second control valve (33), which is provided between the further neutral circulation line (40) and the oil socket (18), is electrically actuated and can be switched in by means of a first switch (52), wherein sensor lines (53, 54) are connected to the coupling switch (57) by the operating member (51).
- Hydraulic power system according to Claim 4, characterised in that the first switch (52) is fitted to the operating member (51), so that it can be operated together with this.
- Hydraulic power system according to Claim 4, characterised in that the second control valve (33) can be activated by means of a second switch (55) when the actuating member (51) for the first control valve (16) is not actuated.
- Hydraulic power system according to Claim 4, characterised in that the coupling switch (57) can be brought into three different positions, wherein the coupling switch (57) does not activate the second control valve (33) when it is in its neutral position, so that this valve remains closed.
- Hydraulic power system according to Claim 7, characterised in that the second switch (55) is a three-position switch.
- Hydraulic power system according to Claim 3, characterised in that the second control valve (33) is automatically opened in the event of an increasing demand on the oil flow in the oil socket.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89499U | 1999-12-23 | ||
| AT89499U AT4093U1 (en) | 1999-12-23 | 1999-12-23 | WORKING HYDRAULIC SYSTEM WITH TWO PUMPS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1111247A2 EP1111247A2 (en) | 2001-06-27 |
| EP1111247A3 EP1111247A3 (en) | 2004-01-14 |
| EP1111247B1 true EP1111247B1 (en) | 2005-02-23 |
Family
ID=3502286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20000127327 Expired - Lifetime EP1111247B1 (en) | 1999-12-23 | 2000-12-13 | Hydraulic power system with two pumps |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1111247B1 (en) |
| AT (1) | AT4093U1 (en) |
| DE (1) | DE50009582D1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185671B (en) * | 2019-04-25 | 2022-06-24 | 中国北方车辆研究所 | Hydraulic power system of four-legged robot with double pump sources for parallel oil supply |
| CN111577684B (en) * | 2020-04-15 | 2022-01-07 | 哈尔滨工业大学 | Hydraulic valve performance test experimental system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3995831A (en) * | 1974-12-17 | 1976-12-07 | The United States Of America As Represented By The Secretary Of The Army | Force feedback controlled winch |
| US4046165A (en) * | 1975-06-04 | 1977-09-06 | Ibec Industries, Inc. | Valve-positioning apparatus |
| US4164119A (en) * | 1978-03-27 | 1979-08-14 | J. I. Case Company | Hydraulic pump unloading system |
| FI823729L (en) * | 1982-11-01 | 1984-05-02 | Valmet Oy | HYDRAULIKSYSTEM FOER EN TRAKTOR ELLER LIKNANDE |
| US5156065A (en) * | 1988-11-11 | 1992-10-20 | Kabushiki Kaisha Kobe Seiko Sho | Control lever apparatus and actuator operation apparatus |
| JP3511425B2 (en) * | 1995-09-18 | 2004-03-29 | 日立建機株式会社 | Hydraulic system |
| JP3550260B2 (en) * | 1996-09-30 | 2004-08-04 | コベルコ建機株式会社 | Actuator operating characteristic control device |
-
1999
- 1999-12-23 AT AT89499U patent/AT4093U1/en not_active IP Right Cessation
-
2000
- 2000-12-13 EP EP20000127327 patent/EP1111247B1/en not_active Expired - Lifetime
- 2000-12-13 DE DE50009582T patent/DE50009582D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1111247A3 (en) | 2004-01-14 |
| AT4093U1 (en) | 2001-01-25 |
| DE50009582D1 (en) | 2005-03-31 |
| EP1111247A2 (en) | 2001-06-27 |
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