EP1259737B1 - Control device for positive displacement pumps - Google Patents

Control device for positive displacement pumps Download PDF

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Publication number
EP1259737B1
EP1259737B1 EP01902363A EP01902363A EP1259737B1 EP 1259737 B1 EP1259737 B1 EP 1259737B1 EP 01902363 A EP01902363 A EP 01902363A EP 01902363 A EP01902363 A EP 01902363A EP 1259737 B1 EP1259737 B1 EP 1259737B1
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EP
European Patent Office
Prior art keywords
flow control
control
control piston
bore
face
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
Application number
EP01902363A
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German (de)
French (fr)
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EP1259737A1 (en
Inventor
Günter DRASKOVITS
Gerhard Zimmermann
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 Automotive Steering GmbH
Original Assignee
ZF Lenksysteme GmbH
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Publication date
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Publication of EP1259737A1 publication Critical patent/EP1259737A1/en
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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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C15/062—Arrangements for supercharging the working space
    • 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
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00

Definitions

  • the invention relates to a control device for positive displacement pumps, especially for vane pumps, according to the preamble of claim 1. It contains a pressure chamber via a throttle device with a to a consumer connected outlet in connection. Next is an in a housing bore of displaceable flow control pistons is provided, its first end face with the pressure chamber connection Has. A second face of the flow control piston protrudes into a chamber with the outlet downstream of the Throttle device is connected.
  • the flow control piston gives depending on one acting on the two end faces Differential pressure a connection from the pressure chamber to one Pump inlet channel free.
  • the throttle device sits in the Pressure output of the pump and contains a control pin, the Control contour is designed so that together with a Throttle bore a changeable passage cross section results.
  • One of the two elements is control pin and Throttle bore connected to the flow control piston and that other of the two elements is fixed to the housing.
  • the invention has for its object a control device to create such an overshoot, d. that is, a brief increase in the delivery rate or Delivery pressure, with rapid acceleration starting from lowest speeds is prevented.
  • Control device solved in that the control pin in an axial displacement range that the flow control piston not yet used for volume flow control is, has a thickened section, so that in this There is a minimal aperture cross-section. It is achieved that the pressure difference over the thickened area is larger and thus the flow control piston earlier, or faster with dynamic processes, emotional.
  • control pin with its thickened section can be easily removed establish if the control pin with the flow control piston connected and the throttle bore is fixed to the housing and the thickened section is cylindrical.
  • the thickened one can better fine-tune the control characteristic Section have a frustoconical contour. It is advantageous if the larger diameter of the Truncated cone on the first face of the flow control piston is arranged. This allows the characteristics of the Control process, the control speed, very finely tuned become.
  • the invention is based on two in the Drawing of illustrated embodiments of the invention explained in more detail.
  • the vane pump shown and described represents only one application example of the invention Control device. Instead, can also a roller cell pump or another positive displacement pump a control device according to the invention.
  • a drive shaft 3 In a housing 2 closed by a cover 1 a drive shaft 3 is mounted.
  • the drive shaft 3 carries a rotor in the usual way on a spline 4th
  • a pressure plate 7 is located on the Pump package consisting of rotor 4, blades 5 and cam ring 6 on.
  • Another pressure plate 8 is due to the force a spring 10 on the other side of the pump package.
  • the wings 5 close delivery chambers, not shown between them, which is connected to a suction port 11 stand.
  • the extracted pressure oil emerges from the delivery chambers via pressure openings, also not shown the pressure plate 8 in a pressure chamber 12.
  • the pressure chamber 12 has part-ring-shaped channels 13 and 14 with under wing spaces 15 and 16 connection. This makes it possible the wings 5 passing through the pressure zone to the outside to press into the cam ring 6.
  • a flow control piston 21 of the flow control valve 18 controls one in a known manner with a control collar 22 Inlet channel 23 of the pump.
  • the control collar 22 In the drawn starting position the control collar 22 is under the load of a spring 24 at the throttle device 20.
  • the inlet duct 23 is closed by the tax authority 22.
  • a closure element 25 for example a pipe screw connection, that with a consumer, for example one Power steering, is connected.
  • An inlet channel 26 closes the pressure chamber 12 to the bore portion 17A on.
  • the throttle device 20 contains a control pin 27, which is firmly connected to the flow control piston 21 and one Throttle bore 28, which is arranged on the closure element 25 and is thus firmly connected to the housing 2.
  • the two elements of control pin 27 can have the same effect and throttle bore 28 each with the other elements Housing 2 and flow control piston 21 may be connected.
  • the control pin 27 has one at its free end Contour on which the speed-dependent influence on the allows the consumer-directed flow.
  • Embodiment contains this contour essentially cylindrical end portion 30 to which a conical Section 31 and a section 32 with the smallest cross section connect.
  • a thickened section 34 of the control pin 27 Between this section 32 and one first end face facing the throttle device 20 33 of the flow control piston 21 is according to the invention a thickened section 34 of the control pin 27.
  • the thickened Section 34 extends over such an axial Length that when the flow control piston 21 no volume flow control by a distance corresponding to this length he follows. This means that after a such shift still no connection between that of of the pressure chamber 12 coming inlet channel 26 to the inlet channel 23 exists.
  • the thickened Section 34 has a cylindrical contour.
  • the thickened section 35 has a frustoconical contour. It is the larger diameter of the truncated cone on the first End face 33 of the flow control piston 21 is arranged. This is particularly advantageous because it is the characteristic of the Control process, the control speed, very finely tuned can be.
  • a receiving the spring 24 of the flow control piston 21 Room 36 stands over a control line indicated by dashed lines 37, an annular groove 38 and a throttle point 40 with a Outlet 41, which is arranged on the closure element 25 is connected.
  • the annular groove 38 and the throttle point 40 are omitted.
  • the Room 36 is on one side by a second end face 42 of the flow control piston 21 limited.
  • the control device works as follows:
  • the entire flow of the pump initially flows through the Inlet channel 26 in the bore section 17A.
  • the flow flows on the end face 33 of the control collar 22 over to the outlet 41.
  • the flow flows through the drawn cross section between the control pin 27 and the throttle bore 28. This adjusts due to the resulting pressure drop in the flow control piston 21 slightly to the left, but the tax office 22 still does not begin with the opening of the inlet channel 23.
  • By the very small throttle cross section between the thickened Section 34 and the throttle bore 28 is formed a large pressure difference across the throttle device 20 and thus above the flow control piston 21. This large pressure difference forces an accelerated movement of the flow control piston 21. This in turn leads to faster Response of the control mechanism so that an overshoot and excessive delivery is prevented.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Description

Die Erfindung betrifft eine Regeleinrichtung für Verdrängerpumpen, insbesondere für Flügelzellenpumpen, nach dem Oberbegriff des Anspruchs 1. Darin steht ein Druckraum über eine Drosseleinrichtung mit einem an einen Verbraucher angeschlossenen Auslaß in Verbindung. Weiter ist ein in einer Gehäusebohrung verschiebbarer Stromregelkolben vorgesehen, dessen erste Stirnfläche mit dem Druckraum Verbindung hat. Eine zweite Stirnfläche des Stromregelkolbens ragt in eine Kammer, die mit dem Auslaß stromabwärts der Drosseleinrichtung verbunden ist. Der Stromregelkolben gibt in Abhängigkeit eines auf die beiden Stirnflächen wirkenden Differenzdrucks eine Verbindung von dem Druckraum zu einem Pumpeneinlaßkanal frei. Die Drosseleinrichtung sitzt im Druckausgang der Pumpe und enthält einen Regelstift, dessen Steuerkontur so ausgeführt ist, daß sich zusammen mit einer Drosselbohrung ein veränderbarer Durchtrittsquerschnitt ergibt. Dabei ist eines der beiden Elemente Regelstift und Drosselbohrung mit dem Stromregelkolben verbunden und das andere der beiden Elemente ist gehäusefest.The invention relates to a control device for positive displacement pumps, especially for vane pumps, according to the preamble of claim 1. It contains a pressure chamber via a throttle device with a to a consumer connected outlet in connection. Next is an in a housing bore of displaceable flow control pistons is provided, its first end face with the pressure chamber connection Has. A second face of the flow control piston protrudes into a chamber with the outlet downstream of the Throttle device is connected. The flow control piston gives depending on one acting on the two end faces Differential pressure a connection from the pressure chamber to one Pump inlet channel free. The throttle device sits in the Pressure output of the pump and contains a control pin, the Control contour is designed so that together with a Throttle bore a changeable passage cross section results. One of the two elements is control pin and Throttle bore connected to the flow control piston and that other of the two elements is fixed to the housing.

Eine derartige, mit einer Drosseleinrichtung zusammenwirkende Regeleinrichtung nach dem Oberbegriff des Anspruchs 1 ist aus der DE 22 30 306 B2 bekannt. Durch einen an seinem freien Ende konischen Zapfen des Regelstiftes erhält die Pumpe eine abfallende Strömungscharakteristik. Bei derartigen Regeleinrichtungen besteht die Gefahr, daß bei einer Drehzahlerhöhung der Pumpe aus dem Proportionalbereich (z. B. Leerlaufbereich) in den Regelbereich eine Überhöhung der Fördermenge eintritt. Dies ist als deutlicher Abfall und anschließender ebenso deutlicher Anstieg des Lenkmomentes zu spüren. Wenn bei einer derartigen Regeleinrichtung ein zusätzliches Druckbegrenzungsventil eingebaut ist, dann kommt es beim Ansprechen dieses Druckbegrenzungsventils außerdem zu einer Überhöhung des maximalen Druckes.Such a cooperating with a throttle device Control device according to the preamble of the claim 1 is known from DE 22 30 306 B2. Through a at its free end conical pin of the control pin the pump receives a falling flow characteristic. With such control devices there is a risk that when the pump speed increases from the proportional range (e.g. idle range) in the control range Excessive delivery occurs. This is more obvious Decline and subsequent equally significant increase of the steering torque. If with such a control device an additional pressure relief valve installed then this pressure relief valve responds also to an increase in the maximum Pressure.

Der Erfindung liegt die Aufgabe zugrunde, eine Regeleinrichtung zu schaffen, mit der ein solches Überschwingen, d. h., eine kurzzeitige Überhöhung der Fördermenge bzw. des Förderdruckes, bei schnellem Beschleunigen ausgehend von niedrigsten Drehzahlen verhindert wird.The invention has for its object a control device to create such an overshoot, d. that is, a brief increase in the delivery rate or Delivery pressure, with rapid acceleration starting from lowest speeds is prevented.

Diese Aufgabe ist durch die im Anspruch 1 gekennzeichnete Regeleinrichtung dadurch gelöst, daß der Regelstift in einem axialen Verschiebe-Bereich, der bei dem Stromregelkolben noch nicht zur Volumenstromregelung herangezogen wird, einen verdickten Abschnitt aufweist, so daß in diesem Verschiebe-Bereich ein minimaler Blendenquerschnitt besteht. Hierbei wird erreicht, daß die Druckdifferenz über dem verdickten Bereich größer ist und sich damit der Stromregelkolben früher, bzw. bei dynamischen Vorgängen schneller, bewegt.This object is characterized by that in claim 1 Control device solved in that the control pin in an axial displacement range that the flow control piston not yet used for volume flow control is, has a thickened section, so that in this There is a minimal aperture cross-section. It is achieved that the pressure difference over the thickened area is larger and thus the flow control piston earlier, or faster with dynamic processes, emotional.

Vorteilhafte und zweckmäßige Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben. Besonders einfach läßt sich der Regelstift mit seinem verdickten Abschnitt herstellen, wenn der Regelstift mit dem Stromregelkolben verbunden und die Drosselbohrung gehäusefest ist und der verdickte Abschnitt zylindrisch ausgebildet wird. Zur besseren Feinabstimmung der Regelkennlinie kann der verdickte Abschnitt eine kegelstumpfförmige Kontur aufweisen. Dabei ist es vorteilhaft, wenn der größere Durchmesser des Kegelstumpfes an der ersten Stirnfläche des Stromregelkolbens angeordnet ist. Dadurch kann die Charakteristik des Regelvorganges, die Regelgeschwindigkeit, sehr fein abgestimmt werden.Advantageous and expedient embodiments of the invention are specified in the subclaims. Especially the control pin with its thickened section can be easily removed establish if the control pin with the flow control piston connected and the throttle bore is fixed to the housing and the thickened section is cylindrical. to The thickened one can better fine-tune the control characteristic Section have a frustoconical contour. It is advantageous if the larger diameter of the Truncated cone on the first face of the flow control piston is arranged. This allows the characteristics of the Control process, the control speed, very finely tuned become.

Im folgenden wird die Erfindung anhand zweier in der Zeichnung dargestellter Ausführungsbeispiele der Erfindung näher erläutert. Die dargestellte und beschriebene Flügelzellenpumpe stellt nur ein Anwendungsbeispiel der erfindungsgemäßen Regeleinrichtung dar. Statt dessen kann ebenso eine Rollenzellenpumpe oder eine andere Verdrängerpumpe mit einer erfindungsgemäßen Regeleinrichtung versehen werden.The invention is based on two in the Drawing of illustrated embodiments of the invention explained in more detail. The vane pump shown and described represents only one application example of the invention Control device. Instead, can also a roller cell pump or another positive displacement pump a control device according to the invention.

Es zeigen:

Fig. 1
eine Regeleinrichtung für eine Flügelzellenpumpe im Längsschnitt nach einem ersten Ausführungsbeispiel und
Fig. 2
einen Stromregelkolben der Regeleinrichtung nach einem zweiten Ausführungsbeispiel.
Show it:
Fig. 1
a control device for a vane pump in longitudinal section according to a first embodiment and
Fig. 2
a flow control piston of the control device according to a second embodiment.

In einem durch einen Deckel 1 verschlossenen Gehäuse 2 ist eine Antriebswelle 3 gelagert. Die Antriebswelle 3 trägt in üblicher Weise auf einer Keilverzahnung einen Rotor 4.In a housing 2 closed by a cover 1 a drive shaft 3 is mounted. The drive shaft 3 carries a rotor in the usual way on a spline 4th

In radialen Schlitzen des Rotors 4 sind radial bewegliche Flügel 5 geführt, die an einem Kurvenring 6 dichtend entlanggleiten. Eine Druckplatte 7 liegt dichtend an dem aus Rotor 4, Flügeln 5 und Kurvenring 6 bestehenden Pumpenpaket an. Eine weitere Druckplatte 8 liegt durch die Kraft einer Feder 10 auf der anderen Seite an dem Pumpenpaket an. Die Flügel 5 schließen nicht dargestellte Förderkammern zwischen sich ein, die mit einem Sauganschluß 11 in Verbindung stehen. Das geförderte Drucköl tritt aus den Förderkammern über ebenfalls nicht dargestellte Drucköffnungen der Druckplatte 8 in eine Druckkammer 12 ein. Die Druckkammer 12 hat über teilringförmige Kanäle 13 und 14 mit Unterflügelräumen 15 und 16 Verbindung. Dadurch ist es möglich, die jeweils die Druckzone durchlaufenden Flügel 5 nach außen in den Kurvenring 6 zu drücken.In radial slots of the rotor 4 are radially movable Wing 5 performed on a cam ring 6 sealing glide along. A pressure plate 7 is located on the Pump package consisting of rotor 4, blades 5 and cam ring 6 on. Another pressure plate 8 is due to the force a spring 10 on the other side of the pump package. The wings 5 close delivery chambers, not shown between them, which is connected to a suction port 11 stand. The extracted pressure oil emerges from the delivery chambers via pressure openings, also not shown the pressure plate 8 in a pressure chamber 12. The pressure chamber 12 has part-ring-shaped channels 13 and 14 with under wing spaces 15 and 16 connection. This makes it possible the wings 5 passing through the pressure zone to the outside to press into the cam ring 6.

In einer Gehäusebohrung 17 im - in der Zeichnung - unteren Teil der Pumpe sind gleichachsig zueinander ein Stromregelventil 18 und eine Drosseleinrichtung 20 eingebaut. Ein Stromregelkolben 21 des Stromregelventils 18 steuert in bekannter Weise mit einem Steuerbund 22 einen Einlaßkanal 23 der Pumpe. In der gezeichneten Ausgangsstellung liegt der Steuerbund 22 unter Belastung einer Feder 24 an der Drosseleinrichtung 20 an. Der Einlaßkanal 23 ist dabei durch den Steuerbund 22 verschlossen. In einem rechts von dem Steuerbund 22 liegenden Bohrungsabschnitt 17A sitzt ein Verschlußelement 25, beispielsweise eine Rohrverschraubung, das mit einem Verbraucher, zum Beispiel einer Hilfskraftlenkung, verbunden wird. Ein Zulaufkanal 26 schließt die Druckkammer 12 an den Bohrungsabschnitt 17A an.In a housing bore 17 in - in the drawing - lower part of the pump are coaxial with each other Flow control valve 18 and a throttle device 20 installed. A flow control piston 21 of the flow control valve 18 controls one in a known manner with a control collar 22 Inlet channel 23 of the pump. In the drawn starting position the control collar 22 is under the load of a spring 24 at the throttle device 20. The inlet duct 23 is closed by the tax authority 22. In a right from the control collar 22 lying bore section 17A sits a closure element 25, for example a pipe screw connection, that with a consumer, for example one Power steering, is connected. An inlet channel 26 closes the pressure chamber 12 to the bore portion 17A on.

Die Drosseleinrichtung 20 enthält einen Regelstift 27, der mit dem Stromregelkolben 21 fest verbunden ist und eine Drosselbohrung 28, die an dem Verschlußelement 25 angeordnet und damit mit dem Gehäuse 2 fest verbunden ist. Mit gleicher Wirkung können die beiden Elemente Regelstift 27 und Drosselbohrung 28 auch jeweils mit den anderen Elementen Gehäuse 2 und Stromregelkolben 21 verbunden sein. The throttle device 20 contains a control pin 27, which is firmly connected to the flow control piston 21 and one Throttle bore 28, which is arranged on the closure element 25 and is thus firmly connected to the housing 2. With The two elements of control pin 27 can have the same effect and throttle bore 28 each with the other elements Housing 2 and flow control piston 21 may be connected.

Der Regelstift 27 weist an seinem freien Ende eine Kontur auf, die die drehzahlabhängige Beeinflussung des an den Verbraucher geleiteten Förderstromes erlaubt. In dem Ausführungsbeispiel enthält diese Kontur einen im wesentlichen zylindrischen Endabschnitt 30, an den sich ein konischer Abschnitt 31 und ein Abschnitt 32 mit kleinstem Querschnitt anschließen. Zwischen diesem Abschnitt 32 und einer ersten, der Drosseleinrichtung 20 zugewandten Stirnfläche 33 des Stromregelkolbens 21 befindet sich erfindungsgemäß ein verdickter Abschnitt 34 des Regelstiftes 27. Der verdickte Abschnitt 34 erstreckt sich über eine solche axiale Länge, daß bei einer Verschiebung des Stromregelkolbens 21 um einen dieser Länge entsprechenden Weg noch keine Volumenstromregelung erfolgt. Dies bedeutet, daß nach einer solchen Verschiebung noch keine Verbindung zwischen dem von der Druckkammer 12 kommenden Zulaufkanal 26 zu dem Einlaßkanal 23 besteht.The control pin 27 has one at its free end Contour on which the speed-dependent influence on the allows the consumer-directed flow. By doing Embodiment contains this contour essentially cylindrical end portion 30 to which a conical Section 31 and a section 32 with the smallest cross section connect. Between this section 32 and one first end face facing the throttle device 20 33 of the flow control piston 21 is according to the invention a thickened section 34 of the control pin 27. The thickened Section 34 extends over such an axial Length that when the flow control piston 21 no volume flow control by a distance corresponding to this length he follows. This means that after a such shift still no connection between that of of the pressure chamber 12 coming inlet channel 26 to the inlet channel 23 exists.

In dem Ausführungsbeispiel nach Fig. 1 weist der verdickte Abschnitt 34 eine zylindrische Kontur auf. In dem Ausführungsbeispiel nach Fig. 2 weist der verdickte Abschnitt 35 eine kegelstumpfförmige Kontur auf. Dabei ist der größere Durchmesser des Kegelstumpfes an der ersten Stirnfläche 33 des Stromregelkolbens 21 angeordnet. Dies ist besonders vorteilhaft, weil so die Charakteristik des Regelvorganges, die Regelgeschwindigkeit, sehr fein abgestimmt werden kann.In the embodiment of FIG. 1, the thickened Section 34 has a cylindrical contour. By doing 2 shows the thickened section 35 has a frustoconical contour. It is the larger diameter of the truncated cone on the first End face 33 of the flow control piston 21 is arranged. This is particularly advantageous because it is the characteristic of the Control process, the control speed, very finely tuned can be.

Ein die Feder 24 des Stromregelkolbens 21 aufnehmender Raum 36 steht über eine gestrichelt angedeutete Steuerleitung 37, eine Ringnut 38 und eine Drosselstelle 40 mit einem Auslaß 41, der an dem Verschlußelement 25 angeordnet ist, in Verbindung. Bei bestimmten Ausführungsformen können die Ringnut 38 und die Drosselstelle 40 entfallen. Der Raum 36 wird an seiner einen Seite durch eine zweite Stirnfläche 42 des Stromregelkolbens 21 begrenzt.A receiving the spring 24 of the flow control piston 21 Room 36 stands over a control line indicated by dashed lines 37, an annular groove 38 and a throttle point 40 with a Outlet 41, which is arranged on the closure element 25 is connected. In certain embodiments the annular groove 38 and the throttle point 40 are omitted. The Room 36 is on one side by a second end face 42 of the flow control piston 21 limited.

Die Regeleinrichtung arbeitet wie folgt:The control device works as follows:

Der gesamte Förderstrom der Pumpe fließt zunächst über den Zulaufkanal 26 in den Bohrungsabschnitt 17A. Bis zum Abregelpunkt bei einer Pumpendrehzahl von zum Beispiel 1000/min fließt der Förderstrom an der Stirnfläche 33 des Steuerbundes 22 vorbei zu dem Auslaß 41. Der Förderstrom durchströmt den gezeichneten Durchtrittsquerschnitt zwischen dem Regelstift 27 und der Drosselbohrung 28. Dabei verstellt sich durch den entstehenden Druckabfall der Stromregelkolben 21 geringfügig nach links, wobei der Steuerbund 22 jedoch noch nicht mit dem Öffnen des Einlaßkanals 23 beginnt. Durch den sehr klein gehaltenen Drosselquerschnitt zwischen dem verdickten Abschnitt 34 und der Drosselbohrung 28 entsteht eine große Druckdifferenz über der Drosseleinrichtung 20 und damit über dem Stromregelkolben 21. Diese große Druckdifferenz erzwingt eine beschleunigte Bewegung des Stromregelkolbens 21. Dies wiederum führt zu einer schnelleren Reaktion des Regelmechanismus, so daß ein Überschwingen und eine Überhöhung der Fördermenge verhindert wird. The entire flow of the pump initially flows through the Inlet channel 26 in the bore section 17A. To the cut-off point at a pump speed of 1000 rpm, for example the flow flows on the end face 33 of the control collar 22 over to the outlet 41. The flow flows through the drawn cross section between the control pin 27 and the throttle bore 28. This adjusts due to the resulting pressure drop in the flow control piston 21 slightly to the left, but the tax office 22 still does not begin with the opening of the inlet channel 23. By the very small throttle cross section between the thickened Section 34 and the throttle bore 28 is formed a large pressure difference across the throttle device 20 and thus above the flow control piston 21. This large pressure difference forces an accelerated movement of the flow control piston 21. This in turn leads to faster Response of the control mechanism so that an overshoot and excessive delivery is prevented.

Bezugszeichenreference numeral

11
Deckelcover
22
Gehäusecasing
33
Antriebswelledrive shaft
44
Rotorrotor
55
Flügelwing
66
Kurvenringcam ring
77
Druckplatteprinting plate
88th
Druckplatteprinting plate
99
--
1010
Federfeather
1111
Sauganschlußsuction
1212
Druckkammerpressure chamber
1313
teilringförmiger Kanalpartially annular channel
1414
teilringförmiger Kanalpartially annular channel
1515
UnterflügelraumUnder wing space
1616
UnterflügelraumUnder wing space
1717
Gehäusebohrunghousing bore
17A17A
Bohrungsabschnittbore section
1818
StromregelventilFlow control valve
1919
--
2020
Drosseleinrichtungthrottling device
2121
StromregelkolbenFlow control piston
2222
Steuerbundcontrol collar
2323
Einlaßkanalintake port
2424
Federfeather
2525
Verschlußelementclosure element
2626
Zulaufkanalinlet channel
2727
Regelstiftregulation pin
2828
Drosselbohrungthrottle bore
2929
- -
3030
Endabschnittend
3131
konischer Abschnittconical section
3232
Abschnitt mit kleinstem QuerschnittSection with the smallest cross section
3333
erste Stirnflächefirst face
3434
verdickter Abschnittthickened section
3535
verdickter Abschnitt (konisch)thickened section (conical)
3636
Raumroom
3737
Steuerleitungcontrol line
3838
Ringnutring groove
3939
--
4040
Drosselstellerestriction
4141
Auslaßoutlet
4242
zweite Stirnflächesecond face

Claims (4)

  1. A control device for positive displacement pumps, in particular vane cell pumps, with the following features:
    a pressure space (12) of the pump is connected via a throttle device (20) to an outlet (41) connected to a consumer;
    a first end face (33) of a flow control piston (21), which is displaceable in a housing bore (17), is connected to the pressure space (12);
    a second end face (42) of the flow control piston (21) delimits a space (36) which is connected to the outlet (41);
    depending on a differential pressure acting on the two end faces, the flow control piston (21) opens a connection from the pressure space (12) to an inlet duct (23) of the pump,
    the throttle device (20) is located in the pressure output (bore portion 17A) of the pump and comprises a control pin (27), the control contour of which is designed in such a manner that, together with a throttling bore (28), a modifiable passage cross section is brought about, one of the two elements, control pin (27) and throttling bore (28), being connected to the flow control piston (21), and the other of the two elements being fixed in relation to the housing,
    characterized in that, in an axial displacement region of the throttle device (20), which region, at the flow control piston (21), is not yet used for volume flow control, the control pin (27) has a thickened portion (34, 35), so that a minimal aperture cross section exists in this displacement region.
  2. The control device as claimed in claim 1, characterized in that the control pin (27) is connected to the flow control piston (21), and the throttling bore (28) is fixed in relation to the housing.
  3. The control device as claimed in claim 2, characterized in that the thickened portion (34) of the control pin (27) has a cylindrical contour, and in that the thickened portion (34) is arranged on the first end face (33) of the flow control piston (21).
  4. The control device as claimed in claim 2, characterized in that the thickened portion (35) of the control pin (27) has a frustoconical contour, the larger diameter of the cone frustum being arranged on the first end face (33) of the flow control piston (21).
EP01902363A 2000-02-11 2001-01-30 Control device for positive displacement pumps Expired - Lifetime EP1259737B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10006140A DE10006140A1 (en) 2000-02-11 2000-02-11 Control system for vane and other displacement pumps has a thickened section at the control pin to prevent temporary increase in the pumped volume/pressure on a rapid acceleration
DE10006140 2000-02-11
PCT/EP2001/000955 WO2001059301A1 (en) 2000-02-11 2001-01-30 Control device for positive displacement pumps

Publications (2)

Publication Number Publication Date
EP1259737A1 EP1259737A1 (en) 2002-11-27
EP1259737B1 true EP1259737B1 (en) 2004-01-07

Family

ID=7630612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01902363A Expired - Lifetime EP1259737B1 (en) 2000-02-11 2001-01-30 Control device for positive displacement pumps

Country Status (6)

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US (1) US7059838B2 (en)
EP (1) EP1259737B1 (en)
JP (1) JP2003522884A (en)
DE (2) DE10006140A1 (en)
ES (1) ES2213685T3 (en)
WO (1) WO2001059301A1 (en)

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JP3893959B2 (en) * 2001-11-29 2007-03-14 アイシン精機株式会社 Oil pump pressure regulating valve mechanism mounting structure
DE10233579A1 (en) * 2002-07-24 2004-02-05 Zf Lenksysteme Gmbh Impeller pump flow regulation valve has a control spring with lengths having different spring constants so that the pump characteristic curve is linear, even at high flow rates
US20040022654A1 (en) * 2002-08-05 2004-02-05 Takashi Ishida Piston type small discharge pump
US8425204B2 (en) * 2004-06-24 2013-04-23 Luk Automobiltechnik Gmbh & Co. Kg Pump
DE102005043253B4 (en) * 2005-09-09 2014-09-04 Zf Lenksysteme Gmbh Method for producing a positive displacement pump and a positive displacement pump produced thereafter
US8333576B2 (en) * 2008-04-12 2012-12-18 Steering Solutions Ip Holding Corporation Power steering pump having intake channels with enhanced flow characteristics and/or a pressure balancing fluid communication channel
US9127674B2 (en) * 2010-06-22 2015-09-08 Gm Global Technology Operations, Llc High efficiency fixed displacement vane pump including a compression spring
JP2016109029A (en) * 2014-12-05 2016-06-20 株式会社デンソー Vane type pump and fuel vapor leakage detecting device using the same
SK500412021A3 (en) * 2021-08-13 2023-03-15 Up-Steel, S.R.O. Radial piston rotary machine

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US4714413A (en) * 1982-04-16 1987-12-22 Ford Motor Company Speed sensitive power steering pump unload valve
DE3837182C2 (en) 1987-11-05 2000-01-13 Zahnradfabrik Friedrichshafen Flow dividing valve
US5540566A (en) * 1992-08-11 1996-07-30 Unista Jecs Corporation Pump including a control valve
DE4317880C2 (en) * 1993-05-28 1997-03-06 Luk Fahrzeug Hydraulik Valve arrangement
US5651665A (en) * 1996-11-12 1997-07-29 General Motors Corporation Adjustable relief valve arrangement for a motor vehicle power steering hydraulic pump system
DE19846815B4 (en) * 1997-10-16 2014-08-07 Ixetic Bad Homburg Gmbh Valve assembly and pump for a transmission
GB2353371B (en) * 1999-08-18 2003-09-17 Sauer Sundstrand Pump with integral pilot operated priority pressure regulating valve

Also Published As

Publication number Publication date
WO2001059301A1 (en) 2001-08-16
US7059838B2 (en) 2006-06-13
JP2003522884A (en) 2003-07-29
ES2213685T3 (en) 2004-09-01
DE10006140A1 (en) 2001-08-16
DE50101292D1 (en) 2004-02-12
EP1259737A1 (en) 2002-11-27
US20030113216A1 (en) 2003-06-19

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