EP2049800B1 - Feed pump - Google Patents
Feed pump Download PDFInfo
- Publication number
- EP2049800B1 EP2049800B1 EP07786069A EP07786069A EP2049800B1 EP 2049800 B1 EP2049800 B1 EP 2049800B1 EP 07786069 A EP07786069 A EP 07786069A EP 07786069 A EP07786069 A EP 07786069A EP 2049800 B1 EP2049800 B1 EP 2049800B1
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- EP
- European Patent Office
- Prior art keywords
- pressure
- input
- feed pump
- output
- pump according
- 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 - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
- F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
- F04C14/226—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/18—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/21—Pressure difference
Definitions
- the invention relates to a feed pump for hydraulic media.
- Feed pumps have a delivery volume, which depends on the speed of the feed pump and its drive. Depending on the system resistance of the consumer or the facilities consuming the pumped hydraulic medium, the system pressure also depends on the delivery volume. In general, there is a desire to keep the system pressure at a constant level or at least within a predetermined range.
- the invention is therefore based on the object, a delivery pump, in particular a pump control to propose, which is easier to set to a desired system pressure.
- FIG. 1 shown block diagram shows a total of 10 designated feed pump whose volume is adjustable.
- the feed pump 10 has an input 12 which is connected to a tank 14.
- the delivery pressure P 1 is present and at the output 16, a pressure relief valve 18 is connected.
- This pressure relief valve 18 is also connected to the tank 14. If the delivery pressure P 1 exceeds the opening pressure of the overpressure valve 18, eg 12 bar, then hydraulic medium flows into the tank 14.
- the outlet 16 is connected to a pressure-reducing element 20, for example a filter 22, a diaphragm or the like.
- the system pressure P 2 is applied .
- the subsidized by the pump 10 hydraulic medium reaches a consumer 26, for example, to an internal combustion engine of a motor vehicle.
- the hydraulic medium flows to the consumer 26 into the tank 14. Due to the pressure reducing element 20, the system pressure P 2 is smaller than the delivery pressure P 1 .
- the output 16 of the feed pump 10 is also connected to a first input 28 of a pump controller 30, the second input 32 is connected to the output 24 of the pressure reducing element 20.
- the reference numeral 46, the minimum pressure of the pump controller 30 is designated.
- the pump controller 30 adjusts the feed pump 10 in the direction of minimum delivery when the pressure at the second input 32 is greater than the pressure at the first input 28.
- the voltage applied to the second input 32 pressure P 2 must exceed at least a minimum pressure, for example, 2 bar. Exceeds the voltage applied to the first input 28 or the minimum pressure of, for example, 2 bar the system pressure P 2 , the pump controller 30 adjusts the feed pump 10 in the direction of maximum delivery. As long as the system pressure P 2 is below the minimum pressure, the feed pump 10 is moved in the direction of maximum delivery.
- a pressure limiter 34 is connected, the first input 36 is connected to the first input 28 of the pump controller 30 and the second input 38 is connected to the tank 14.
- the system pressure P 2 is applied .
- the desired size 42 of the pressure limiter 34 is in particular adjustable and is 5.5 bar, for example. This means that the pressure limiter 34 connects the first input 36 to the second input 38 when the control input 40, a pressure exceeding the target size 42 is applied, ie when the system pressure P 2 exceeds the target size. Hydraulic medium flows into the tank 14. As a result, the pressure at the first input 28 of the pump regulator 30 is reduced below the system pressure P 2 , so that the pump regulator 30 adjusts the feed pump 10 in the direction of minimum delivery.
- the system pressure P 2 also drops until it drops below the value of the delivery pressure P 1 , whereupon the pump regulator 30 is again adjusted in the direction of maximum delivery.
- the system pressure P 2 is thus maintained between the minimum pressure and the desired size 42.
- From the pressure limiter 34 so hydraulic fluid is discharged into the tank 14, which has not yet passed the pressure reducing element 20.
- the system pressure P 2 is changed only by an adjustment of the feed pump 10.
- a throttle 48 is provided, which is in particular adjustable.
- control piston 44 of the pressure limiter 34 is shown, wherein the control piston 44 is shown in its the first input 36 from the second input 38 separating position.
- the feed pump 10 is a vane pump 50, whose rotor 52 is driven by a shaft 54 and in radial slots 56 carries a plurality of vanes 58, which rotate about sliding shoes 60 on an inner peripheral surface 62 of a stator 64.
- the stator 64 is pivotally mounted and has a pivot axis 66 and two pistons 68 and 70, the piston 68 and 70 of the pump controller 30 in the FIG. 1 correspond. By pivoting the stator 64 about the pivot axis 66 in the direction of the arrows 71, the delivery rate of the feed pump 10 is changed.
- the second input 38 of the pressure limiter 34 When in the FIG. 3 the second input 38 of the pressure limiter 34 is connected to the control input 40, so that when the pressure limiter 34 is open, the pressure applied to the first input 36 is transferred to the second input 38.
- Such a circuit has the significant advantage that it works lossless. From the FIG. 3a It can be seen that the second input 38 is connected directly to the control input 40 and that a displacement of the piston 44 causes a connection of the two inputs 36 and 38.
- the output 24 of the pressure reducing element 20 is connected to an electromagnetically driven control valve 72 (a 3/2-way valve).
- the output 24 of the pressure reducing element 20 via the control valve 72 to a second control input 74 of the pressure limiter 34 is connected.
- actuating forces for the pressure limiter 34 thus act on the first control input 40 applied system pressure P 2 with the force acting within the control piston 44 force F 1 and the voltage applied to the second control input 74 system pressure P 2 with the force acting within the control piston 44 force F 2nd
- the control piston 44 is in the FIG. 4a shown, from which it is clearly visible that the force F 2 is greater than the force F 1 due to the larger effective piston area, which acts only on an annular surface.
- the control valve 72 is driven, for example, by a motor computer 76, whereby a map control of the feed pump 10 is made possible.
- the system pressure P 2 can be set to any value between the minimum pressure (pump controller 30) and the desired size 42 (pressure limiter 34).
- the FIG. 4 also shows a shut-off valve 78, which is controlled by the system pressure P 2 and whose input 80 is connected to the output 82 of the control valve 72.
- the output 84 of the shut-off valve 78 is connected to the second input 32 of the pump controller 30 and to the control input 40 of the pressure limiter 34. Accordingly, the system pressure P 2 is present at the control input 40.
- the second control input 74 of the pressure limiter 34, the system pressure P 2 and the pressure limiter 34 opens because the force F 2 due to the system pressure P 2 at the second control input 74 in addition to the force F 1 of the system pressure P 2 at the control input 40th added, so that the two inputs 36 and 38 are connected to each other.
- the pump controller 30 adjusts the feed pump 10 in the direction of minimum delivery.
- the control valve 72 is switched over and closes the second control input 74.
- the system pressure P 2 then rises until it reaches the desired value 42 or until the engine computer 76 in turn controls the control valve 72 controls and opens. In this way, the system pressure P 2 according to a map control within a predetermined bandwidth can be set to desired different values.
- FIG. 5 shows the feed pump 10 with in the FIG. 4 illustrated circuit.
- the pressure limiter 34 has the second control input 74, which is connected both to the control valve 72 and to the shut-off valve 78.
- the control valve 72 is actuated by the engine computer 76 and connects the second control input 74 via the shut-off valve 78 to the outlet 24 of the pressure-reducing element 20.
- FIG. 7 shows the position of the circuit in case of failure of the engine computer 76 and the map control.
- the control valve 72 is not activated and closes the output 24 in the direction of the shut-off valve 78 and the pressure limiter 34. Accordingly, there is no pressure at the second control input 74, so that the force F 2 is zero.
- the second input 32 of the pump controller 30 is also no pressure, so that it assumes the position for maximum promotion.
- the system pressure P 2 increases until the shut-off valve 78 is changed over and connects the output 24 with both the pump regulator 30 and with the pressure limiter 34.
- the control input 40 is now the system pressure P 2 and the pressure limiter 34 opens as soon as the pressure of the target size 42 is exceeded.
- the pump controller 30 is adjusted towards minimum promotion. This means that in the event of failure of the engine computer 76, the system pressure P 2 is determined by the desired value 42. Also in this variant of the second input 38, as in the variant of Figures 3 and 6 , are connected to the control input 40. This variant would then also lossless.
- FIG. 8 shows a further variant of the invention, wherein hereinafter only on the differences compared to the variant of FIG. 1 will be received.
- the pressure limiter 34 is formed by a hydraulically driven control valve 86 (a 4/2-way valve), whose one, in particular adjustable control value 42 is for example 5.5 bar.
- the other control variable is supplied by the system pressure P 2 , which is applied to the input 88.
- the control valve 86 In the in FIG. 8 shown position of the control valve 86, the second input 32 of the pump controller 30 to the tank 14 and the first input 28 of the pump controller 30 to the output 16 of the feed pump 10 is connected.
- the pump controller 30 is thereby adjusted in the direction of maximum delivery.
- FIG. 9 shows this variant in an embodiment to which the above-mentioned components are connected. The same components are provided with the same reference numerals.
- the second input 32 of the pump regulator 30 with the tank 14 and the outlet 16 of the delivery pump 10 are connected directly to the consumer 26.
- the pump controller 30 is moved in the direction of maximum delivery, as long as the delivery pressure P 1 is below the manipulated variable 42. If the delivery pressure P 1 exceeds the manipulated variable 42, then the output 24 of the pressure reducing element 20 with the tank 14 and the output 16 of the feed pump 10 with the second input 32 of the Pump controller 30 is connected, so that the pump controller 30 is adjusted in the direction of minimum promotion, since at the first input 28, a pressure is applied, which is smaller than the delivery pressure P 1 due to the throttle 48.
- the FIG. 11 shows this variant in one embodiment.
- the pressure limiter 34 is formed as a 4/2-way valve 90.
- the first control input 40 with the shut-off valve 78 and the second control input 74 are connected both to the control valve 72 and to the shut-off valve 78.
- the directional control valve 90 reverses and connects the first input 28 to the tank 14, so that the pump regulator 30 is adjusted in the direction of minimum delivery.
- the 4/2-way valve 90 connects the 4/2-way valve 90 to the second input 32 of the pump controller 30 to the tank, so that the pump controller 30 is initially adjusted in the direction of maximum promotion.
- the output 24 is connected to the system pressure P 2 to the first input 28 of the pump controller 30.
- the directional valve 90 reverses and connects the second input 32 of the pump regulator 30 to the output 24 and the first input 28 of the pump regulator 30 to the tank 14, so that the pump regulator 30 is adjusted in the direction of minimum funding.
- FIG. 16 shows a variant of the invention according to FIG. 8 , wherein the pressure limiter 34 is formed as a 4/2-way valve 86 and not only via the input 88, to which the system pressure P 2 is applied, but is also driven in parallel by means of the motor computer 76 electromagnetically.
- the first input 28 of the pump controller 30 to the tank 14 and the second input 32 of the pump controller 30 to the output 24 is connected.
- the pump regulator 30 is adjusted in the direction of minimum delivery.
- the 4/2-way valve 86 at which point the second input 32 of the pump controller 30 is connected to the tank 14 and the first input 28 to the output 24.
- the pump regulator 30 is adjusted in the direction of maximum delivery.
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Abstract
Description
Die Erfindung betrifft eine Förderpumpe für hydraulische Medien.The invention relates to a feed pump for hydraulic media.
Förderpumpen besitzen ein Fördervolumen, welches von der Drehzahl der Förderpumpe und deren Antrieb abhängt. Abhängig vom Systemwiderstand des Verbrauchers beziehungsweise der das geförderte hydraulische Medium verbrauchenden Einrichtungen hängt auch der Systemdruck vom Fördervolumen ab. In der Regel besteht der Wunsch, den Systemdruck auf einem konstanten Niveau oder zumindest innerhalb einer vorgegebenen Bandbreite zu halten.Feed pumps have a delivery volume, which depends on the speed of the feed pump and its drive. Depending on the system resistance of the consumer or the facilities consuming the pumped hydraulic medium, the system pressure also depends on the delivery volume. In general, there is a desire to keep the system pressure at a constant level or at least within a predetermined range.
Aus der
Der Erfindung liegt daher die Aufgabe zugrunde, eine Förderpumpe, insbesondere eine Pumpenregelung, vorzuschlagen, die einfacher auf einen gewünschten Systemdruck einstellbar ist.The invention is therefore based on the object, a delivery pump, in particular a pump control to propose, which is easier to set to a desired system pressure.
Diese Aufgabe wird mit einer Förderpumpe gelöst, die die Merkmale des Anspruchs 1 aufweist.This object is achieved with a feed pump having the features of
Vorteilhafte Ausgestaltungen, Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung bevorzugte Ausführungsformen im Einzelnen beschrieben sind. Dabei können die in der Zeichnung dargestellten sowie in der Beschreibung als auch in den Ansprüchen erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein.Advantageous embodiments, advantages, features and details of the invention will become apparent from the subclaims and the following description in which preferred embodiments are described in detail with reference to the drawing. The features shown in the drawing and in the description as well as in the claims mentioned may each be essential to the invention individually or in any desired combination.
In der Zeichnung zeigen:
Figur 1- ein Blockschaltbild einer ersten Ausführungsform der Erfindung;
- Figur 1a
- eine vergrößerte Wiedergabe des Druckbegrenzers gemäß
;Figur 1 Figur 2- ein Anwendungsbeispiel der in der
dargestellten Schaltung bei einer Flügelzellenpumpe mit verstellbarem Rotor;Figur 1 - Figur 3
- eine Variante der Ausführungsform gemäß
mit verlustfreier Förderung;Figur 1 - Figur 3a
- eine vergrößerte Wiedergabe des Druckbegrenzers gemäß
Figur 3 ; Figur 4- eine Variante der Ausführungsform gemäß
mit einem innerhalb einer Bandbreite geregelten Systemdruck;Figur 1 - Figur 4a
- eine vergrößerte Wiedergabe des Druckbegrenzers gemäß
;Figur 4 - Figur 5
- ein Anwendungsbeispiel der in der
dargestellten Schaltung bei einer Flügelzellenpumpe mit verstellbarem Rotor;Figur 4 - Figur 6
- eine Variante der Ausführungsform gemäß
mit einem innerhalb einer Bandbreite geregelten Systemdruck mit verlustfreier Förderung;Figur 4 - Figur 6a
- eine vergrößerte Wiedergabe des Druckbegrenzers gemäß
Figur 6 ; - Figur 7
- die Variante gemäß
bei Ausfall der Kennfeldregelung;Figur 4 - Figur 8
- ein Blockschaltbild einer weiteren Ausführungsform der Erfindung mit Konstantdruckregelung;
- Figur 9
- ein Anwendungsbeispiel der in der
Figur 8 dargestellten Schaltung bei einer Flügelzellenpumpe mit verstellbarem Rotor; Figur 10- ein Blockschaltbild einer weiteren Ausführungsform der Erfindung mit Konstantdruckregelung;
- Figur 11
- ein Anwendungsbeispiel der in der
dargestellten Schaltung bei einer Flügelzellenpumpe mit verstellbarem Rotor;Figur 10 Figur 12- ein Anwendungsbeispiel einer weiteren Ausführungsform der Erfindung mit Kennfeldregelung in einer Flügelzellenpumpe mit verstellbarem Rotor;
- Figur 13
- ein Anwendungsbeispiel einer weiteren Ausführungsform der Erfindung mit Kennfeldregelung in einer Flügelzellenpumpe mit verstellbarem Rotor;
Figur 14- eine Variante des Anwendungsbeispiel der
bei Ausfall der Kennfeldregelung;Figur 12 - Figur 15
- eine Variante des Anwendungsbeispiel der
Figur 13 bei Ausfall der Kennfeldregelung; und Figur 16- eine Variante der Erfindung gemäß
Figur 8 .
- FIG. 1
- a block diagram of a first embodiment of the invention;
- FIG. 1a
- an enlarged view of the pressure limiter according to
FIG. 1 ; - FIG. 2
- an example of application in the
FIG. 1 shown circuit in a vane pump with adjustable rotor; - FIG. 3
- a variant of the embodiment according to
FIG. 1 with lossless promotion; - FIG. 3a
- an enlarged view of the pressure limiter according to
FIG. 3 ; - FIG. 4
- a variant of the embodiment according to
FIG. 1 with system pressure controlled within a bandwidth; - FIG. 4a
- an enlarged view of the pressure limiter according to
FIG. 4 ; - FIG. 5
- an example of application in the
FIG. 4 shown circuit in a vane pump with adjustable rotor; - FIG. 6
- a variant of the embodiment according to
FIG. 4 with system pressure controlled within a bandwidth with lossless delivery; - FIG. 6a
- an enlarged view of the pressure limiter according to
FIG. 6 ; - FIG. 7
- the variant according to
FIG. 4 in case of failure of the map control; - FIG. 8
- a block diagram of another embodiment of the invention with constant pressure control;
- FIG. 9
- an example of application in the
FIG. 8 shown circuit in a vane pump with adjustable rotor; - FIG. 10
- a block diagram of another embodiment of the invention with constant pressure control;
- FIG. 11
- an example of application in the
FIG. 10 shown circuit in a vane pump with adjustable rotor; - FIG. 12
- an application example of another embodiment of the invention with map control in a vane pump with adjustable rotor;
- FIG. 13
- an application example of another embodiment of the invention with map control in a vane pump with adjustable rotor;
- FIG. 14
- a variant of the application example of
FIG. 12 in case of failure of the map control; - FIG. 15
- a variant of the application example of
FIG. 13 in case of failure of the map control; and - FIG. 16
- a variant of the invention according to
FIG. 8 ,
Das in der
Der Ausgang 16 der Förderpumpe 10 ist außerdem mit einem ersten Eingang 28 eines Pumpenreglers 30 verbunden, dessen zweiter Eingang 32 mit dem Ausgang 24 des Druckminderelements 20 verbunden ist. Mit dem Bezugszeichen 46 ist der Mindestdruck des Pumpenreglers 30 bezeichnet. Der Pumpenregler 30 verstellt die Förderpumpe 10 in Richtung Minimalförderung, wenn der Druck am zweiten Eingang 32 größer ist als der Druck am ersten Eingang 28. Der am zweiten Eingang 32 anliegende Druck P2 muss aber mindestens einen Mindestdruck zum Beispiel von 2 bar überschreiten. Übersteigt der am ersten Eingang 28 anliegende Druck oder der Mindestdruck von zum Beispiel 2 bar den Systemdruck P2, verstellt der Pumpenregler 30 die Förderpumpe 10 in Richtung Maximalförderung. Solange der Systemdruck P2 unterhalb des Mindestdrucks liegt, wird die Förderpumpe 10 in Richtung Maximalförderung verstellt.The
Parallel zum Pumpenregler 30 ist ein Druckbegrenzer 34 geschaltet, dessen erster Eingang 36 mit dem ersten Eingang 28 des Pumpenreglers 30 verbunden ist und dessen zweiter Eingang 38 mit dem Tank 14 verbunden ist. Am Steuereingang 40 liegt der Systemdruck P2 an. Die Sollgröße 42 des Druckbegrenzers 34 ist insbesondere einstellbar und beträgt um Beispiel 5,5 bar. Dies bedeutet, dass der Druckbegrenzer 34 den ersten Eingang 36 mit dem zweiten Eingang 38 verbindet, wenn am Steuereingang 40 ein die Sollgröße 42 überschreitender Druck anliegt, d.h. wenn der Systemdruck P2 die Sollgröße überschreitet. Hydraulikmedium strömt in den Tank 14 ab. Dadurch verringert sich der Druck am ersten Eingang 28 des Pumpenreglers 30 unter den Systemdruck P2, so dass der Pumpenregler 30 die Förderpumpe 10 in Richtung Minimalförderung verstellt. Der Systemdruck P2 sinkt dadurch ebenfalls ab, bis er unter den Wert des Förderdrucks P1 absinkt, woraufhin der Pumpenregler 30 wieder in Richtung Maximalförderung verstellt wird. Der Systemdruck P2 wird also zwischen dem Mindestdruck und der Sollgröße 42 gehalten. Vom Druckbegrenzer 34 wird also Hydraulikmedium in den Tank 14 abgeleitet, welches das Druckminderelement 20 noch nicht passiert hat. Der Systemdruck P2 wird nur durch eine Verstellung der Förderpumpe 10 verändert. Außerdem ist erkennbar, dass zwischen dem Ausgang 16 der Förderpumpe 10 und dem ersten Eingang 28 des Pumpenreglers 30 eine Drossel 48 vorgesehen ist, die insbesondere einstellbar ist.Parallel to the
In der
In der
Bei der in der
In der
Der Steuerkolben 44 ist in der
Das Steuerventil 72 wird zum Beispiel von einem Motorrechner 76 angesteuert, wodurch eine Kennfeldregelung der Förderpumpe 10 ermöglicht wird. Der Systemdruck P2 kann auf jeden Wert zwischen dem Mindestdruck (Pumpenregler 30) und der Sollgröße 42 (Druckbegrenzer 34) eingestellt werden.The
Die
Wird das Steuerventil 72 über den Motorrechner 76 angesteuert und nimmt dieses die in der
Ist der gewünschte Systemdruck P2 erreicht, was vom Motorrechner 76 festgestellt wird, wird das Steuerventil 72 umgeschaltet und verschließt den zweiten Steuereingang 74. Der Systemdruck P2 steigt daraufhin an, bis er die Sollgröße 42 erreicht oder bis der Motorrechner 76 wiederum das Steuerventil 72 ansteuert und öffnet. Auf diese Weise kann der Systemdruck P2 gemäß einer Kennfeldregelung innerhalb einer vorgegebenen Bandbreite auf gewünschte unterschiedliche Werte eingestellt werden.If the desired system pressure P 2 is reached, which is detected by the
Die
Bei der in der
Die
Die
Bei der in der
Bei der in der
Beim Ausführungsbeispiel gemäß der
Bei der in der
Bei der in der
Die
Claims (15)
- A feed pump (10) for hydraulic media, comprising an input (12) and an output (16), at the output (16) a feed pressure (P1) being present, a pressure-reducing element (20) that is connected to the output (16), at the output (24) of the element the system pressure (P2) being present and the output (24) being connected to a consumer (26), wherein the output (16) is connected to the first input (28) of a pump controller (30), the second input (32) being connected to the output (24) of the pressure-reducing element (20), and wherein the pump controller (30) adjusts the feed pump (10) toward maximum delivery if the system pressure (P2) is smaller than a minimum pressure (46) or if the system pressure (P2) is smaller than the pressure present at the first input (28), characterized in that parallel to the pump controller (30) a pressure limiter (34) is switched such that at the first input (36) thereof the pressure present at the first input (28) of the pump controller (30) is present and that at the control input (40) the system pressure (P2) is present, the pressure limiter (34) opening if the system pressure (P2) is greater than a desired quantity (42).
- The feed pump according to claim 1, characterized in that the pressure-reducing element (20) is a filter (22) or the like.
- The feed pump according to one of the preceding claims, characterized in that the minimum pressure (46) is 1,5 bar to 3 bar, particularly 2 bar, and/or is adjustable during the controlled operation or upon standstill of the controller.
- The feed pump according to one of the preceding claims, characterized in that the desired quantity (42) is 4 bar to 8 bar, particularly 5,5 bar, and/or is adjustable during the controlled operation or upon standstill of the controller.
- The feed pump according to one of the preceding claims, characterized in that a regulator (48) is interconnected between the output (16) of the feed pump (10) and the first input (28) of the pump controller (30).
- The feed pump according to one of the preceding claims, characterized in that a pressure control valve (18) is provided downstream of the output (16) of the feed pump (10), which particularly opens at 9 bar to 15 bar, particularly at 12 bar, and/or at a pressure adjustable during the controlled operation or upon standstill of the controller, e.g. into a tank (14).
- The feed pump according to one of the preceding claims, characterized in that the system pressure (P2) is present at the second input (38) of the pressure limiter (34) and the open pressure limiter (34) connects the first input (36) to the second input (38).
- The feed pump according to one of the preceding claims, characterized in that the pressure limiter (34) comprises a second control input (74), wherein particularly the two control inputs (40 and 74) of the pressure limiter (34) are hydraulically connected in series.
- The feed pump according to claim 8, characterized in that the second control input (74) of the pressure limiter (34) includes a pressure force transmission with respect to the first control input (40).
- The feed pump according to claim 8 or 9, characterized in that a control valve (72) is provided, which connects the output (24) of the pressure-reducing element (20) to the second control input (74) of the pressure limiter (34), wherein particularly the output (82) of the control valve (72) is connected to the second input (74) of the pressure limiter (34).
- The feed pump according to claim 10, characterized in that the control valve (72) can be controlled hydraulically and/or electromagnetically and/or via an engine controller (76) of a motor vehicle.
- The feed pump according to claims 10 or 11, characterized in that a shut-off valve (78) is provided between the output (82) of the control valve (72) and the first control input (40) of the pressure limiter (34).
- The feed pump according to claim 12, characterized in that the shut-off valve (78) comprises a control input at which the system pressure (P2) is present.
- The feed pump according to one of the preceding claims, characterized in that a control valve (72), particularly a 4/2-way valve (90), is provided, which connects the second output (32) of the pump controller (30) to the tank.
- The feed pump according to claim 14, characterized in that the control valve (72) can be controlled hydraulically and/or electromagnetically.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610039698 DE102006039698B3 (en) | 2006-08-21 | 2006-08-21 | Feed pump for feeding hydraulic medium to internal combustion engine of motor vehicle, has pump controller adjusting feed pump toward maximum delivery, if system pressure is smaller than minimum pressure |
DE200620015508 DE202006015508U1 (en) | 2006-10-10 | 2006-10-10 | Hydraulic pump has input and output, with delivery pressure available at output and pressure reduction component provided at output |
PCT/EP2007/006265 WO2008022672A1 (en) | 2006-08-21 | 2007-07-14 | Feed pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2049800A1 EP2049800A1 (en) | 2009-04-22 |
EP2049800B1 true EP2049800B1 (en) | 2011-12-28 |
Family
ID=38577399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07786069A Expired - Fee Related EP2049800B1 (en) | 2006-08-21 | 2007-07-14 | Feed pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US7802971B2 (en) |
EP (1) | EP2049800B1 (en) |
JP (1) | JP5209622B2 (en) |
KR (1) | KR101229173B1 (en) |
WO (1) | WO2008022672A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012022265A1 (en) * | 2012-11-13 | 2014-05-15 | Fmb Blickle Gmbh | Method for controlling e.g. axial piston pump for appropriate power supply in fluid system, involves filtering fluid guided by control line from fluid system prior to entry into controller of displacement pump through control line |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0912540D0 (en) * | 2009-07-20 | 2009-08-26 | Bamford Excavators Ltd | Hydraulic system |
DE102009046516A1 (en) * | 2009-11-09 | 2011-05-12 | Zf Lenksysteme Gmbh | displacement |
WO2013040780A1 (en) * | 2011-09-22 | 2013-03-28 | 长沙中联重工科技发展股份有限公司 | Control system for variable displacement pump and hydraulic travelling equipment |
JP6456277B2 (en) * | 2015-12-18 | 2019-01-23 | 日立建機株式会社 | Construction machinery |
CN111076091A (en) * | 2020-01-06 | 2020-04-28 | 广州环投环境服务有限公司 | High-lift constant-current feeding device |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
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DE8335902U1 (en) * | 1983-12-14 | 1987-06-04 | Brueninghaus Hydraulik Gmbh, 7240 Horb | Torque control device for an adjustable hydraulic pump |
JP2657548B2 (en) * | 1988-06-29 | 1997-09-24 | 日立建機株式会社 | Hydraulic drive device and control method thereof |
JPH0332793Y2 (en) * | 1988-11-22 | 1991-07-11 | ||
JPH0462376U (en) * | 1990-10-04 | 1992-05-28 | ||
DE4224973C2 (en) * | 1992-07-29 | 1995-08-03 | Glyco Metall Werke | Fluid supply system with pressure limitation |
JP3441834B2 (en) * | 1995-04-05 | 2003-09-02 | 日立建機株式会社 | Drive control device for construction machinery |
DE19517974A1 (en) * | 1995-05-16 | 1996-11-21 | Brueninghaus Hydromatik Gmbh | Slidable hydraulic power or torque control device |
JPH09226610A (en) * | 1996-02-23 | 1997-09-02 | Unisia Jecs Corp | Power steering device |
DE19742157C2 (en) * | 1997-09-24 | 1999-07-01 | Brueninghaus Hydromatik Gmbh | Control device for an adjustable hydraulic pump with several consumers |
JP4209503B2 (en) * | 1998-07-16 | 2009-01-14 | 株式会社小松製作所 | Control device for hydraulic drive machine |
JP2001050178A (en) | 1999-08-06 | 2001-02-23 | Bosch Braking Systems Co Ltd | Variable displacement type pump |
JP3460817B2 (en) * | 2000-06-28 | 2003-10-27 | 株式会社小松製作所 | Hydraulic control device for hydraulic excavator |
JP2002130145A (en) * | 2000-10-19 | 2002-05-09 | Komatsu Ltd | Displacement control device for variable displacement pump |
DE10104635A1 (en) | 2001-02-02 | 2002-10-02 | Joma Hydromechanic Gmbh | Method for maintaining a constant output value, e.g. pressure, feed volume or capacity for vehicle oil pump, using rotational velocity transducer to adjust rotational speed of pump |
JP4408406B2 (en) * | 2004-09-24 | 2010-02-03 | 株式会社小松製作所 | Pump variable displacement controller with unload function |
-
2007
- 2007-07-14 WO PCT/EP2007/006265 patent/WO2008022672A1/en active Application Filing
- 2007-07-14 KR KR1020077023798A patent/KR101229173B1/en not_active IP Right Cessation
- 2007-07-14 JP JP2009524911A patent/JP5209622B2/en not_active Expired - Fee Related
- 2007-07-14 EP EP07786069A patent/EP2049800B1/en not_active Expired - Fee Related
- 2007-09-02 US US11/849,293 patent/US7802971B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012022265A1 (en) * | 2012-11-13 | 2014-05-15 | Fmb Blickle Gmbh | Method for controlling e.g. axial piston pump for appropriate power supply in fluid system, involves filtering fluid guided by control line from fluid system prior to entry into controller of displacement pump through control line |
Also Published As
Publication number | Publication date |
---|---|
KR20090120019A (en) | 2009-11-24 |
KR101229173B1 (en) | 2013-02-01 |
US20080279699A1 (en) | 2008-11-13 |
US7802971B2 (en) | 2010-09-28 |
WO2008022672A1 (en) | 2008-02-28 |
EP2049800A1 (en) | 2009-04-22 |
JP2010501762A (en) | 2010-01-21 |
JP5209622B2 (en) | 2013-06-12 |
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