DE2815362A1 - Hydraulic system with common pump and several outlets - has throttle valve on pump inlet controlled by high pressure outlets - Google Patents

Hydraulic system with common pump and several outlets - has throttle valve on pump inlet controlled by high pressure outlets

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Publication number
DE2815362A1
DE2815362A1 DE19782815362 DE2815362A DE2815362A1 DE 2815362 A1 DE2815362 A1 DE 2815362A1 DE 19782815362 DE19782815362 DE 19782815362 DE 2815362 A DE2815362 A DE 2815362A DE 2815362 A1 DE2815362 A1 DE 2815362A1
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Germany
Prior art keywords
line
pump
consumer
pressure
control valve
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.)
Withdrawn
Application number
DE19782815362
Other languages
German (de)
Inventor
Walter Dipl-Ing Kobald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19782815362 priority Critical patent/DE2815362A1/en
Publication of DE2815362A1 publication Critical patent/DE2815362A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • 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
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed 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
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/351—Flow control by regulating means in feed line, i.e. meter-in control
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5158—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and an output member
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6052—Load sensing circuits having valve means between output member and the load sensing circuit using check valves
    • 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
    • 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
    • F15B2211/78—Control of multiple output members
    • F15B2211/781—Control of multiple output members one or more output members having priority

Abstract

A constant volume pump draws hydraulic liquid from a container and delivers it to a discharge pipe which branches to two high pressure outlets. Each of these has a control valve on its inlet. There is a multi-position throttle valve on the inlet to the pump. A branch from the pump delivery goes through one section of this valve to a low pressure outlet. The valve is spring loaded and has control inputs from the pump delivery and from the high pressure outlets. The arrangement enables a constant volume pump to be used for both the high and low pressure outlets.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Hydraulikanlage nach der Gattung des Hauptanspruchs. Bei bekannnten, druckangepaßten System werden Verstellpumpen verwendet, die je nach Anzahl der Verbraucher oder dem erforderlichen Verbraucherdruck entsprechend eingeregelt werden. Nun haben aber Verstellpumpen den Nachteil, daß sie teuer sind und aufgrund ihrer Bauweise auch empfindlich im Betrieb.The invention is based on a hydraulic system of the type of the main claim. In known, pressure-adapted systems, variable displacement pumps are used used, depending on the number of consumers or the required consumer pressure adjusted accordingly. However, variable displacement pumps have the disadvantage that they are expensive and, due to their construction, also sensitive to operation.

Vorteile der Erfindung Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß das druckangepaßte System mit einer Konstantpumpe betrieben werden kann und in einem bestimmten Betriebszustand zusätzlich auch Verbraucher versorgen kann, die bei niedrigem Druck arbeiten.Advantages of the invention The arrangement according to the invention with the characterizing Features of the main claim has the advantage that the pressure-adapted System can be operated with a fixed displacement pump and in a certain operating state can also supply consumers who work at low pressure.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale möglich.The measures listed in the subclaims are advantageous Further developments and improvements to the features specified in the main claim are possible.

Zeichnung Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 in schematischer Darstellung ein erstes Ausführungsbeispiel einer Hydraulikanlage, in Figur 2 ein Abwandlung einer Einzelheit.Drawing An embodiment of the invention is shown in the drawing and explained in more detail in the following description. It show figure 1 a schematic representation of a first exemplary embodiment of a hydraulic system, in FIG. 2 a modification of a detail.

Beschreibung der Erfindung In Figur 1 ist mit 10 eine mit konstantem Fördervolumen arbeitende Zahnradpumpe bezeichnet, die über eine Saugleitung 11 Druckmittel aus einem Behälter 12 ansaugt. In der Saugleitung ist ein Regelventil 13 angeordnet, das im Prinzip einem Stromregelventil bzw. einer sogenannten Druckwaage entspricht. Es hat mehrere, jedoch nicht genau definierte Zwischen-Schaltstellungen, die hier der Einfachheit halber mit I bis IJI bezeichnet sind, wobei jedoch die Übergänge fließend sind, was durch die gestichelten Trennlinien gekennzeichnet ist. In den Zwischenstellungen wird der Zufluß vom Behälter 12 zur Saugseite durch das Regelventil mehr oder weniger stark gedrosselt, was durch dei Drosselsymbole an den Durchflußpfeilen zum Ausdruck kommt. Das Regelventil hat vier Anschlüsse A bis D und ist von seiner einen Seite her durch eine Feder 14 und über eine Leitung 15 belastet, von seiner anderen Seite her über eine Leitung 16. Die Leitung 15 geht von einer Leitung 17 aus, die in eine Leitung 19 mündet. Die Leitung 16 geht von der Förderleitung 20 der Pumpe 10 aus.Description of the Invention In Figure 1, 10 is a constant Delivery volume working gear pump referred to via a suction line 11 pressure medium sucks in from a container 12. A control valve 13 is arranged in the suction line, which in principle corresponds to a flow control valve or a so-called pressure compensator. It has several, but not exactly defined, intermediate switch positions, which are shown here for the sake of simplicity are denoted by I to IJI, but with the transitions are fluid, which is indicated by the dashed dividing lines. In the The inflow from the container 12 to the suction side through the control valve is intermediate positions throttled to a greater or lesser extent, which is indicated by the throttle symbols on the flow arrows is expressed. The control valve has four ports A to D and is one of his loaded on one side by a spring 14 and via a line 15, from his the other side via a line 16. The line 15 goes from a line 17 which opens into a line 19. The line 16 goes from the delivery line 20 the pump 10 off.

Von der Leitung 16 zweigt eine Leitung 21 ab, die am Anschluß A des Regelventils mündet und vom Anschluß C über ein Druckbegrenzungsventil 22 zum Behälter führt. Von der Leitung 21 zweigt hinter dem Anschluß C eine Leitung 23 ab, die zu einem Niederdruckverbraucher 24 führt.From the line 16 branches off a line 21 which is connected to the terminal A of the Control valve opens and from port C via a pressure relief valve 22 to the container leads. From the line 21 branches off behind the connection C, a line 23 which closes a low-pressure consumer 24 leads.

Die Förderleitung 20 mündet in eine Leitung 25, die einerseits zu einem 5/3-Wegeventil 26 und andererseits zu einem 5/3-Wegeventil 27 führt. Von diesen Ventilen führen je zwei nicht näher bezeichnete Leitungen zu mit hohem Druck betriebenen Verbraucher 28, 29. Die Leitung 19 verbindet die beiden Wegeventile 26, 27 miteinander. In ihr sind zwei Rückschlagventile 30, 31 angeordnet, die beidseits der Mündungsstelle der Leitung 17 in die Leitung 19 liegen. Auch in der Zuleitung der Leitung 25 zu den Wegeventlen ist jeweils vor diesen ein Rückschlagventil 32 bzw. 33 angeordnet. In der von der Leitung 19 zum Behälter 12 führenden Leitung 17 ist eine Drossel 34 angeordnet, die stromab der Mündungsstelle der Leitung 15 in die Leitung 17 liegt.The delivery line 20 opens into a line 25, which on the one hand closes a 5/3-way valve 26 and on the other hand to a 5/3-way valve 27 leads. Of these Valves each lead to two unspecified lines to operated at high pressure Consumer 28, 29. The line 19 connects the two directional control valves 26, 27 with one another. In it two check valves 30, 31 are arranged, which are on both sides of the mouth the Line 17 are in line 19. Also in the feed line 25 to the Wegeventlen a check valve 32 and 33 is arranged in front of each. In the line 17 leading from the line 19 to the container 12 is a throttle 34 arranged, which is located downstream of the point at which the line 15 opens into the line 17.

Es sei angenommen, daß die Wegeventile 26, 27 in ihren Schaltstellungen I stehen. Druckmittel gelangt dann über die Förderleitung 20 und die Wegeventile zu den Verbrauchern 28, 29. Gleichzeitig gelangt Druckmittel in die Leitung 19 von beiden Seiten her und von ihr in die Leitung 17 über die sich öffnenden Rückschlagventile 30, 31. Da die Drossel 34 einen großen Durchflußwiderstand bietet, gelangt nur ein geringer Teil des geförderten Druckmittels über die Leitung 17 in den Behälter 12. Der Druck vor der Drossel 34 wirkt über die Leitung 15 auf das Regelventil 13. Der Förderdruck in der Leitung 20 wirkt über die Leitung 16 auf die entgegengesetzte Seite des Regelventils. Bei zugeschalteten Verbrauchern 28, 29 ist der Druck in der Leitung 17 so groß, daß das Regelventil 13 in seine Schaltstellung III verschoben wird. Damit wird die Verbindung über die Leitung 21 und das Regelventil 13 zur Leitung 23 unterbrochen, d.h. Druckmittel gelangt nur zu den Verbrauchern 28, 29.It is assumed that the directional control valves 26, 27 are in their switching positions I stand. Pressure medium then reaches the delivery line 20 and the directional control valves to the consumers 28, 29. At the same time pressure medium reaches the line 19 of both sides and from her into the line 17 via the opening check valves 30, 31. Since the throttle 34 offers a large flow resistance, only one arrives Small part of the conveyed pressure medium via the line 17 into the container 12. The pressure upstream of the throttle 34 acts via the line 15 on the control valve 13. The Delivery pressure in line 20 acts via line 16 on the opposite one Side of the control valve. When consumers 28, 29 are connected, the pressure in the line 17 so large that the control valve 13 is moved into its switching position III will. The connection via line 21 and control valve 13 thus becomes a line 23 interrupted, i.e. pressure medium only reaches consumers 28, 29.

Sind die Verbraucher 28, 29 ganz abgeschaltet durch Einstellen der Wegeventile 26, 27 in die Schaltstellungen II, so wird die Leitung 17 drucklos, worauf das Regelventil 13 durch den in der Leitung 16 herrschenden Druck ganz nach rechts entgegen der Kraft der Feder 14 verschoben wird. Das gesamte von der Pumpe geförderte Druckmittel gelangt nun über die Förderleitung 20, die Leitung 21, das Regelventil 13 und über dessen Anschluß C in die Leitung 23 zum Niederdruckverbraucher 24. Das Druckbegrenzungsventil 22 ist auf einen relativ niedrigen Druck eingestellt. Dies ist die Entlastungsstellung (Stand-by"-Stellung). Es stellt sich ein Kräftegleichgewicht am Regelventil zwischen dem Druck in der Leitung 16 und der Kraft der Feder 14 ein. Wird nun einer oder werden beide Verbraucher 28, 29 durch Betätigen der Wegeventile 26, 27 zugeschaltet, so baut sich in der Leitung 17 wiederum ein Druck auf, der abhängig ist von dem an den Verbrauchern benötigten Druck. Entsprechend dem in der Leitung 17 herrschenden Druck pendelt nun das Regelventil zwischen den Stellungen I und III, wobei infolge der Drosselstellungen von der Pumpe 10 nur soviel Druckmittel angesaugt wird, wie die Verbraucher benötigen.If the consumers 28, 29 are completely switched off by setting the Directional valves 26, 27 in switching positions II, the line 17 is depressurized, whereupon the control valve 13 by the pressure prevailing in the line 16 completely after is shifted right against the force of the spring 14. All of that from the pump conveyed pressure medium now reaches the conveying line 20, the line 21, the Control valve 13 and via its terminal C in the line 23 to Low-pressure consumer 24. The pressure relief valve 22 is at a relatively low level Pressure set. This is the relief position (stand-by position) There is an equilibrium of forces at the control valve between the pressure in line 16 and the force of the spring 14. If one or both consumers are now 28, 29 switched on by actuating the directional control valves 26, 27, it builds up in the line 17 again a pressure that depends on what is required by the consumers Pressure. The control valve now oscillates in accordance with the pressure prevailing in line 17 between positions I and III, whereby due to the throttle positions of the pump 10 only as much pressure medium is sucked in as the consumers need.

In dem Betriebszustand, in dem die Verbraucher 28, 29 zugeschaltet sind, d.n. wenn in der Leitung 17 ein bestimmter Druck herrscht, wirkt das Regelventil 13 für den Verbraucher 24 als Strombegrenzungsventil. Auf diese Weise erhält man mit einer Konstantpumpe ein System, das an den jeweils benötigten Druck angepaßt ist und bei dem auch noch ein Verbraucher mit niedrigerem Druck betrieben werden kann.In the operating state in which the consumers 28, 29 are switched on are, i.e. when there is a certain pressure in line 17, the control valve acts 13 for the consumer 24 as a current limiting valve. That way you get with a fixed displacement pump a system that adapts to the required pressure and in which a consumer can also be operated at a lower pressure can.

Beim Ausführungsbeispiel nach der Figur 2 ist lediglich die Zahnradpumpe 10 durch eine Radialkolbenpumpe 35 ersetzt. Die Saugleitung 11 führt in diesem Fall über ein Rückschlagventil 36 zu den Kolbenbohrungen 3X. In der Förderleitung 20 ist gleich hinter der Pumpe ebenfalls ein Rückschlagventil 37 eingebaut, das sich aber im entgegengesetzten Sinn öffnet und schließt wie das Rückschlagventil 36. Die Funktion ist genau dieselbe wie beim Ausführungsbeispiel nach der Figur 1.In the embodiment according to Figure 2, only the gear pump is 10 replaced by a radial piston pump 35. The suction line 11 leads in this case via a check valve 36 to the piston bores 3X. In the delivery line 20 a check valve 37 is also installed right behind the pump, which is but in the opposite sense opens and closes like the check valve 36. The function is exactly the same as in the exemplary embodiment according to FIG. 1.

Claims (7)

Ansprüche Hydraulikanlage mit einer Pumpe zum Versorgen mehrerer Lr Verbraucher, dadurch gekennzeichnet, daß im Zulauf (11) zu der als Konstantpumpe (10, 35) ausgebildeten Pumpe ein den Zulauf mindestens zeitweise drosselndes Regelventil (13) angeordnet ist, das einerseits vom Förderdruck der Pumpe beaufschlagt ist, andererseits von einer Feder (14) und dem Verbraucherdruck von mindestens einem ersten an die Förderleitung (20) angeschlossenen Verbraucher (28, 29).Claims Hydraulic system with one pump to supply several Lr Consumer, characterized in that in the inlet (11) to the as a constant pump (10, 35) designed a control valve that at least temporarily throttles the inlet (13) is arranged, which on the one hand is acted upon by the delivery pressure of the pump, on the other hand by a spring (14) and the consumer pressure of at least one first consumer (28, 29) connected to the delivery line (20). 2. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß mindestens ein zweiter Verbraucher (24) über eine von der Förderleitung (20) abzweigenden Leitung (16, 21) versorgt wird und daß diese Zweigleitung über das Regelventil (13) zu diesem Verbraucher führt. 2. Plant according to claim 1, characterized in that at least a second consumer (24) via a line branching off from the delivery line (20) (16, 21) is supplied and that this branch line via the control valve (13) to this Consumer leads. 3. Anlage nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, daß das Regelventil (13) nach Art eines Stromregelventils ausgebildet ist und je nach Verbraucherbelastung freien oder gedrosselten Durchfluß vom Behalter zum Sauganschluß der Pumpe gewährt. 3. Plant according to claim 1 and / or 2, characterized in that the control valve (13) is designed in the manner of a flow control valve and depending on Consumer load free or restricted flow from the container to the suction connection granted to the pump. 4. Anlage nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die den ersten Verbrauchern zugeordnete Wegeventile (26, 27) durch eine gemeinsame Leitung (19) miteinander verbunden sind, von denen eine Steuerdruckleitung (17) über eine Drossel (34) zum Behälter führt und daß vor der Drossel eine Leitung (15) abzweigt, die an die Seite des Regelventils (13) führt, wo auch die Feder (14) liegt 4. Plant according to one of claims 1 to 3, characterized in that that the directional control valves (26, 27) assigned to the first consumers by a common Line (19) are connected to each other, of which a control pressure line (17) leads to the container via a throttle (34) and that in front of the throttle there is a line (15) branches off, which leads to the side of the control valve (13), where the spring (14) is located 5. Anlage nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß beidseits der Mündungsstelle der Leitung (17) in die Leitung (19) je ein Rückschlagventil (30, 31) angeordnet ist, das sich in Richtung von den Wegeventilen zu der Leitung (17) hin zu öffnen vermag.5. Plant according to one of claims 1 to 3, characterized in that both sides the point at which the line (17) opens into the line (19) each have a check valve (30, 31) is arranged, which extends in the direction of the directional control valves to the line (17) is able to open. 6. Anlage nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß an die Leitung (21, 25) von der Pumpe zum zweiten Verbraucher (24) ein Druckbegrenzungsventil (22) angeschlossen ist.6. Plant according to one of claims 1 to 5, characterized in that that on the line (21, 25) from the pump to the second consumer (24) a pressure relief valve (22) is connected. 7. Anlage nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß als Druckmittelquelle eine Verdrängerpumpe, z. B. eine Zahnradpumpe oder Axialkolbenpumpe (35) vorgesehen ist.7. Plant according to one of claims 1 to 6, characterized in that that as a pressure medium source a positive displacement pump, z. B. a gear pump or axial piston pump (35) is provided.
DE19782815362 1978-04-10 1978-04-10 Hydraulic system with common pump and several outlets - has throttle valve on pump inlet controlled by high pressure outlets Withdrawn DE2815362A1 (en)

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Application Number Priority Date Filing Date Title
DE19782815362 DE2815362A1 (en) 1978-04-10 1978-04-10 Hydraulic system with common pump and several outlets - has throttle valve on pump inlet controlled by high pressure outlets

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Application Number Priority Date Filing Date Title
DE19782815362 DE2815362A1 (en) 1978-04-10 1978-04-10 Hydraulic system with common pump and several outlets - has throttle valve on pump inlet controlled by high pressure outlets

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4746276A (en) * 1987-02-27 1988-05-24 Dana Corporation Gear pump having conditional dry valve closure structure
US4813853A (en) * 1986-07-19 1989-03-21 Barmag Ag Internal gear pump
US4850814A (en) * 1987-01-09 1989-07-25 Barmag Ag Hydraulic gear pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4813853A (en) * 1986-07-19 1989-03-21 Barmag Ag Internal gear pump
US4850814A (en) * 1987-01-09 1989-07-25 Barmag Ag Hydraulic gear pump
US4746276A (en) * 1987-02-27 1988-05-24 Dana Corporation Gear pump having conditional dry valve closure structure

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