EP0491809A1 - Radial piston pump. - Google Patents

Radial piston pump.

Info

Publication number
EP0491809A1
EP0491809A1 EP90914061A EP90914061A EP0491809A1 EP 0491809 A1 EP0491809 A1 EP 0491809A1 EP 90914061 A EP90914061 A EP 90914061A EP 90914061 A EP90914061 A EP 90914061A EP 0491809 A1 EP0491809 A1 EP 0491809A1
Authority
EP
European Patent Office
Prior art keywords
pump
piston
pressure
cylinder
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.)
Granted
Application number
EP90914061A
Other languages
German (de)
French (fr)
Other versions
EP0491809B1 (en
Inventor
Joerg Thurner
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.)
Oekomobil Gesellschaft fur Oekologische Technolog
Original Assignee
Oeamtc-Betriebe GmbH
Technische Hydraulik Geraete GmbH
OEAMTC BETRIEBE GmbH
Tech Hydraulik Geraete Ges M B
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 Oeamtc-Betriebe GmbH, Technische Hydraulik Geraete GmbH, OEAMTC BETRIEBE GmbH, Tech Hydraulik Geraete Ges M B filed Critical Oeamtc-Betriebe GmbH
Publication of EP0491809A1 publication Critical patent/EP0491809A1/en
Application granted granted Critical
Publication of EP0491809B1 publication Critical patent/EP0491809B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means

Definitions

  • the invention relates to a radial piston pump with a plurality of radially arranged cylinder piston arrangements with suction and pressure valves, the piston of which is controlled by an eccentric disk which rotates eccentrically with respect to a housing holding the cylinders.
  • Such devices have a very complicated structure.
  • the problem also arises that the control of such a radial piston pump is mostly digital, but these pumps have an analog behavior. It is therefore necessary to detect the position of the control device assigned to certain partial loads and to reproduce it as accurately as possible, but there is the problem that the positions of the control device corresponding to certain partial flow rates change with the delivery pressure.
  • Another problem also lies in the fact that for many applications of such radial piston pumps a very fine gradation of the partial delivery quantities of e.g. in the size of 2 to 3% of the maximum amount conveyed is required.
  • the aim of the invention is to propose a radial piston pump of the type mentioned at the outset, which is characterized by a simple construction and is suitable for direct digital control for regulating the delivery rate.
  • Individual cylinders could also be shut down by keeping a permanent connection between the suction side of the pump and the pressure side of a piston open. In this case, however, this cylinder would not contribute to the pressure build-up in the pressure line, and when a larger number of cylinders are shut down, there are correspondingly long pauses between the individual pressure surges, which are usually undesirable for the operation of such pumps connected downstream .
  • controllable valve is arranged in a pressure valve on ⁇ , wherein the valve body hollow and is provided with an opening facing the cylinder, which is controlled by a displaceably held control piston which can be controlled independently of the pressure conditions in the associated cylinder.
  • FIG. 1 shows a section through a radial piston pump according to the invention
  • FIG. 2 shows an end view of a radial piston pump according to the invention
  • FIG. 3 shows a section through a cylinder piston arrangement of a radial piston pump according to the invention on an enlarged scale.
  • the radial piston pump has a housing 1, in which a shaft 2 is rotatably mounted in inclined roller bearings 4, which has an eccentric disk 3 arranged eccentrically with respect to the central axis of the shaft 2. On this eccentric disc 3, a ring 6 is supported via a roller bearing 5, in which the pistons 7 are held via ball heads 8.
  • the pistons 7 slide in cylinders 9 which are held in the housing 1 and have openings 10 in their end region facing the shaft 1, which openings 10 connect the interior of the piston 7 with the interior 11 of the pump which is connected to the suction side of the pump sealed housing 1 connects.
  • a suction valve 13 On the end face 12 of the cylinder 9 facing the face of the piston 7, a suction valve 13 is arranged, which is designed as a poppet valve, the valve plate 14 is designed as a mass part and by the spring 15 and the valve rod 16 and the spring plate 17 against the closing position is biased.
  • the cylinder spaces are 'connected via arranged in the end walls of the cylinder 9 with the pressure valves 18 Druckleitun ⁇ gen 19th
  • the pressure valves 18 are controllable, for which purpose a magnet (not shown) is provided.
  • the pressure valve 18 has a hollow valve body 20, in which a control piston 21 is slidably held, which controls the opening 22 of the valve body 20.
  • the valve body 20 is biased against the closed position by means of a relatively weak spring 23.
  • the control piston 21 is guided in the core 24 of the magnet (not shown) and is biased against the closed position by means of a relatively strong spring 25.
  • valve body 20 is held in the closed position by the two springs 23, 25, whereby penetration of pressure fluid into the interior of the valve body 20 is prevented.
  • the cylinders 9 and the pistons 7 of the pump have different diameters. This means that by switching individual cylinders or several cylinders 9 on and off by opening the connection between the interior of the cylinders and the pressure line 19, the delivery capacity of the pump can be varied. For example, in the example shown with five cylinders 9 (FIG. 2) there are 24 different power levels, or 48 power levels with seven cylinders. By correspondingly coordinating the diameters of the individual cylinders and correspondingly controlling their control pistons 21 for producing and preventing a connection between the pressure line 19 and the interior of the cylinder 9, gradations of the delivery capacity with seven cylinders from about 2% to 2% of the full power of the pump are possible.
  • Switching off the cylinders and / or preventing their effectiveness by opening the pressure valve 18 also has the advantage that the pulsation of the delivery volume remains the same as when the delivery rate is full, that is to say when all of the pressure valves 18 are closed. Only the amplitude of the pulsation changes, the smaller the more pressure valves 18 are opened. This facilitates the use of such a pump for applications in which a digital control of the delivery capacity of the pump is provided, since in this case only the corresponding pressure valves 18 have to be actuated, with a very fine-tuned Leis ⁇ with a correspondingly large number of cylinders control is possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Compressor (AREA)

Abstract

The invention concerns a radial piston pump with a multiplicity of radially disposed cylinder/pump assemblies with foot and head valves, the pistons being controlled by a cam plate which rotates eccentrically with respect to a housing holding the cylinders. In order to produce a simple design for a pump of this kind and to permit digital pump-throughput control, the invention calls for the space between the ends (12) of the cylinders (9) and their associated pistons (7) to be connected to a pressure line (19) via a valve (21, 22) which can be controlled at will, the pump pistons (7) preferably having different diameters.

Description

Radialkolbenpumpe Radial piston pump
Die Erfindung bezieht sich auf eine Radi lkol enpumpe mit einer Vielzahl von radial angeordneten Zylinderkolbenan¬ ordnungen mit Saug- und Druckventilen, deren Kolben von einer Exzenterscheibe gesteuert ist, die gegenüber einem die Zylin¬ der haltenden Gehäuse exzentrisch umläuft.The invention relates to a radial piston pump with a plurality of radially arranged cylinder piston arrangements with suction and pressure valves, the piston of which is controlled by an eccentric disk which rotates eccentrically with respect to a housing holding the cylinders.
Bei derartigen bekannten Pumpen besteht das Problem der Regelbarkeit der Fördermenge. Um dieses Problem zu lösen werden meist mechanische Regeleinrichtungen vorgesehen, die im wesentlichen darin bestehen, die Exzentrizi ät der Exzenter¬ scheibe zu variieren, um dadurch den Hub der Kolben zu verän¬ dern .In such known pumps there is the problem of regulating the delivery rate. In order to solve this problem, mechanical control devices are usually provided, which essentially consist in varying the eccentricity of the eccentric disc in order to change the stroke of the pistons.
Derartige Einrichtungen weisen einen sehr komplizier¬ ten Aufbau auf. Dabei ergibt sich auch noch das Problem, daß die Ansteuerung einer solchen Radialkolbenpumpe meist digital erfolgt, diese Pumpen aber ein analoges Verhalten aufweisen. Es ist daher notwendig, die bestimmten Teillasten zugeordnete Stellung der Regeleinrichtung zu erfassen und möglichst genau zu reproduzieren, wobei jedoch das Problem besteht, daß sich die bestimmten Tei 1fördermengen entsprechenden Stellungen der Regeleinrichtung mit dem Förderdruck ändern. Ein weiteres Pro¬ blem besteht auch darin, daß für viele Anwendungen solcher Radialkolbenpumpen eine sehr feine Abstufung der Teilförder¬ mengen von z.B. in der Größe von 2 bis 3% der maximalen För¬ dermenge erforderlich ist.Such devices have a very complicated structure. The problem also arises that the control of such a radial piston pump is mostly digital, but these pumps have an analog behavior. It is therefore necessary to detect the position of the control device assigned to certain partial loads and to reproduce it as accurately as possible, but there is the problem that the positions of the control device corresponding to certain partial flow rates change with the delivery pressure. Another problem also lies in the fact that for many applications of such radial piston pumps a very fine gradation of the partial delivery quantities of e.g. in the size of 2 to 3% of the maximum amount conveyed is required.
Daraus ergibt sich ein weiteres Problem, da die mei¬ sten Regeleinrichtungen einen Verstellweg in der Größenordnung von ca. 15mm aufweisen und sich daher bei einer Abstufung der Fördermenge in Stufen von ca. 2% der maximalen Fördermenge Ab¬ stufungen des Verstellweges von näherungsweise 0,3mm ergeben, die entsprechend abgetastet werden müssen, woduch sich ein entsprechend großer Aufwand ergibt .This results in a further problem, since most of the control devices have an adjustment path of the order of magnitude of approximately 15 mm and therefore, with a gradation of the delivery rate in steps of approx. 2% of the maximum delivery amount, the adjustment route is graded from approximately 0, 3mm result, which must be scanned accordingly, which results in a correspondingly large effort.
Ziel der Erfindung ist es eine Radialkolbenpumpe der eingangs erwähnten Art vorzuschlagen, die sich durch einen einfachen Aufbau auszeichnet und sich für eine direkte digi¬ tale Ansteuerung zur Regelung der Fördermenge eignet.The aim of the invention is to propose a radial piston pump of the type mentioned at the outset, which is characterized by a simple construction and is suitable for direct digital control for regulating the delivery rate.
Erfindungsgemäß wird dies dadurch" erreicht, daß der Raum zwischen den Stirnseiten der Zylinder und den zugehöri¬ gen Kolben über ein steuerbares Ventil mit einer Druckleitung der Pumpe verbindbar ist, wobei die Kolben der Pumpe vorzugs¬ weise unterschiedliche Durchmesser aufweisen.This is achieved by "According to the invention that the space between the end faces of the cylinder and the piston zugehöri ¬ gene via a controllable valve to a pressure line the pump can be connected, the pistons of the pump preferably having different diameters.
Auf diese Weise ist es möglich das Fördervolumen der Pumpe durch Öffnen und Schließen der einzelnen willkürlich steuerbaren Ventile zu regeln. Bei einer Pumpe, deren Zylin¬ der, bzw. Kolben bei gleichem Hub verschiedene Durchmesser aufweisen, lassen sich z.B. bei sieben verschiedenen Zylindern 48 verschiedene Stufen erreichen, wodurch sich Abstufungen der Fördermenge in der Größe von ca. 2% ergeben. Dabei erübrigen sich aufwendige Stellungsüberwachungen, wie sie bei den her¬ kömmlichen Radialkolbenpumpen mit mechanischen, die Exzentri¬ zität der die Kolben steuernden Exzenterscheibe beeinflussen¬ den Regeleinrichtungen erforderlich sind, wodurch sich die An¬ steuerung der Radialkolbenpumpe wesentlich vereinfacht.In this way it is possible to regulate the delivery volume of the pump by opening and closing the individually arbitrarily controllable valves. In the case of a pump whose cylinders or pistons have different diameters with the same stroke, 48 different stages can be achieved, for example, with seven different cylinders, which results in graduations in the delivery rate of approximately 2%. In this case, encumbrance position monitoring functions are unnecessary, as capacity in the forth ¬ conventional radial piston pumps with mechanical, the Exzentri ¬ which the pistons controlling eccentric beeinflussen¬ the control devices are required, thus increasing the An¬ control of the radial piston pump substantially simplified.
Durch die im Falle der Öffnung, des willkürlich steu¬ erbaren Ventiles gegebene Verbindung des Inneren des betref¬ fenden Zylinders mit einer Druckleitung ergibt sich der Vor¬ teil, daß de betreffende Zylinder zwar zur Pulsation der se¬ kundlichen Fördermenge beiträgt, doch wird dieses Fördervolu¬ men nicht wirksam, da es nach dem Erreichen des Totpunktes des Zylinders am Ende des Druckhubes beim nachfolgenden Saughub wieder eingesogen. Bedingt ist dies dadurch, daß aufgrund der Verbindung des Zylinderinneren mit der Druckleitung dieses ständig unter Druck gehalten wird, wodurch sich das Saugventil dieses Zylinders nicht öffnen kann. Es ergibt sich daher, daß die sekundliche Fördermenge der Pumpe zwar unabhängig von der Anzahl der geöffneten, willkürlich steuerbaren Ventile pul¬ siert, jedoch die Amplitude dieser Pulsationen mit steigender Anzahl geöffneter, willkürlich steuerbarer Ventile sinkt.Due to the connection of the interior of the cylinder concerned with a pressure line in the case of the opening of the arbitrarily controllable valve, there is the advantage that the cylinder in question contributes to the pulsation of the specific delivery rate, but this delivery volume becomes ¬ men ineffective, since it is sucked in again after reaching the dead center of the cylinder at the end of the pressure stroke in the subsequent suction stroke. This is due to the fact that, due to the connection of the cylinder interior to the pressure line, the pressure line is kept constantly under pressure, as a result of which the suction valve of this cylinder cannot open. It therefore follows that the secondary delivery rate of the pump pulsates independently of the number of open, arbitrarily controllable valves, but the amplitude of these pulsations decreases with an increasing number of opened, arbitrarily controllable valves.
Eine Stillegung einzelner Zylinder wäre auch durch Offenhalten einer ständigen Verbindung zwischen der Saugseite der Pumpe und der Druckseite eines Kolbens möglich. In diesem Falle würde aber dieser Zylinder nichts zum Druckaufbau in der Druckleitung beitragen und bei Stillsetzung einer größeren An¬ zahl von Zylinderen kommt es zu- entsprechend langen Pausen zwischen den einzelnen Druckstößen, die für den Betrieb der solchen Pumpen nachgeschalteten Einrichtungen meist uner¬ wünscht sind.Individual cylinders could also be shut down by keeping a permanent connection between the suction side of the pump and the pressure side of a piston open. In this case, however, this cylinder would not contribute to the pressure build-up in the pressure line, and when a larger number of cylinders are shut down, there are correspondingly long pauses between the individual pressure surges, which are usually undesirable for the operation of such pumps connected downstream .
Nach einem weiteren Merkmal der Erfindung kann vorge¬ sehen sein, daß das steuerbare Ventil in einem Druckventil an¬ geordnet ist, wobei dessen Ventilkörper hohl ausgebildet und mit einer dem Zylinder zugekehrten Öffnung versehen ist, die von einem verschiebbar gehaltenen Steuerkolben gesteuert ist, der unabhängig von den Druckverhältnissen im zugeordneten Zy¬ linder steuerbar ist.According to a further feature of the invention vorge be seen that the controllable valve is arranged in a pressure valve on ¬, wherein the valve body hollow and is provided with an opening facing the cylinder, which is controlled by a displaceably held control piston which can be controlled independently of the pressure conditions in the associated cylinder.
Durch diese Maßnahmen ergibt sich ein einfacher Auf¬ bau einer erfindungsgemäßen Radialkolbenpumpe. Außerdem ist es dadurch auch möglich bestehende Radialkolbenpumpen auf relativ einfache Weise umzurüsten. Dazu ist es lediglich notwendig das vorhandene Druckventil gegen ein in der angegebenen Weise mo¬ difiziertes Druckventil zu ersetzen.These measures result in a simple construction of a radial piston pump according to the invention. It also makes it possible to retrofit existing radial piston pumps in a relatively simple manner. To do this, it is only necessary to replace the existing pressure valve with a pressure valve modified in the manner specified.
Die Erfindung wird nun anhand der Zeichnungen näher erläutert. Dabei zeigt:The invention will now be explained in more detail with reference to the drawings. It shows:
Fig. 1 einen Schnitt durch eine erfindungsgemäße Ra¬ dialkolbenpumpe ,1 shows a section through a radial piston pump according to the invention,
Fig. 2 eine Stirnansicht einer erfindungsgemäßen Ra¬ dialkolbenpumpe, und2 shows an end view of a radial piston pump according to the invention, and
Fig. 3 einen Schnitt durch eine Zylinder-Kolbenanord¬ nung einer erfindungsgemäßen Radialkolbenpumpe in vergrößertem Maßstab .3 shows a section through a cylinder piston arrangement of a radial piston pump according to the invention on an enlarged scale.
Die Radialkolbenpumpe weist ein Gehäuse 1 auf, in dem eine Welle 2 in Schrägrollenlagern 4 drehbar gelagert ist, die eine gegenüber der Mittelachse der Welle 2 exzentrisch ange¬ ordnete Exzenterscheibe 3 aufweist. Auf dieser Exzenter¬ scheibe 3 ist über ein Rollenlager 5 ein Ring 6 gelagert, in dem die Kolben 7 über Kugelköpfe 8 gehalten sind.The radial piston pump has a housing 1, in which a shaft 2 is rotatably mounted in inclined roller bearings 4, which has an eccentric disk 3 arranged eccentrically with respect to the central axis of the shaft 2. On this eccentric disc 3, a ring 6 is supported via a roller bearing 5, in which the pistons 7 are held via ball heads 8.
Die Kolben 7 gleiten in Zylindern 9, die im Gehäuse 1 gehalten sind und weisen in deren der Welle 1 zugekehrten End¬ bereich Öffnungen 10 auf, die das Innere des Kolbens 7 mit dem mit der Saugseite der Pumpe in Verbindung stehenden Innen¬ raum 11 des abgedichteten Gehäuses 1 verbindet.The pistons 7 slide in cylinders 9 which are held in the housing 1 and have openings 10 in their end region facing the shaft 1, which openings 10 connect the interior of the piston 7 with the interior 11 of the pump which is connected to the suction side of the pump sealed housing 1 connects.
An der der Stirnseite 12 des Zylinders 9 zugekehrten Stirnfläche des Kolbens 7 ist ein Saugventil 13 angeordnet, das als Tellerventil ausgebildet ist, dessen Ventilteller 14 als Masseteil ausgebildet ist und der durch die Feder 15 und die Ventilstange 16 und den Federteller 17 gegen die Schlie߬ stellung vorgespannt ist.On the end face 12 of the cylinder 9 facing the face of the piston 7, a suction valve 13 is arranged, which is designed as a poppet valve, the valve plate 14 is designed as a mass part and by the spring 15 and the valve rod 16 and the spring plate 17 against the closing position is biased.
Die Zylinderräume sind' über in den Stirnwänden der Zylinder 9 angeordnete Druckventile 18 mit den Druckleitun¬ gen 19 verbindbar.The cylinder spaces are 'connected via arranged in the end walls of the cylinder 9 with the pressure valves 18 Druckleitun ¬ gen 19th
Die Druckventile 18 sind steuerbar, wozu je ein nicht dargestellter Magnet vorgesehen ist. Das Druckventil 18 weist einen hohlen Ventilkörper 20 auf, in dem ein Steuerkolben 21 verschiebbar gehalten ist, der die Öffnung 22 des Ventilkörpers 20 steuert.The pressure valves 18 are controllable, for which purpose a magnet (not shown) is provided. The pressure valve 18 has a hollow valve body 20, in which a control piston 21 is slidably held, which controls the opening 22 of the valve body 20.
Der Ventilkörper 20 ist mittels einer relativ schwa¬ chen Feder 23 gegen die Schließstellung vorgespannt. Der Steu¬ erkolben 21 ist im Kern 24 des nicht dargestellten Magneten geführt und mittels einer relativ starken Feder 25 gegen die Schließstellung vorgespannt.The valve body 20 is biased against the closed position by means of a relatively weak spring 23. The control piston 21 is guided in the core 24 of the magnet (not shown) and is biased against the closed position by means of a relatively strong spring 25.
Solange der nicht dargestellte Magent nicht erregt ist, wird der Ventilkörper 20 durch die beiden Federn 23, 25 in der Schließstellung gehalten, wobei ein Eindringen von Druckflüssigkeit in das Innere des Ventilkörpers 20 verhindert ist .As long as the magent, not shown, is not excited, the valve body 20 is held in the closed position by the two springs 23, 25, whereby penetration of pressure fluid into the interior of the valve body 20 is prevented.
Während des Druckhubes des Kolbens 7 wird der Ventil¬ körper 20 von seinem Sitz abgehoben und die Druckflüssigkeit strömt in die Druckleitungen 19. Beim Erreichen des Totpunktes am Ende des Druckhubes schließt das Druckventil 18. Wird je¬ doch der nicht dargestellte Magnet erregt, so wird der Steuer¬ kolben 21 zurückgezogen, wodurch eine Verbindung zwischen der Druckleitung 19 und dem Inneren des Zylinders 9 hergestellt wird. 9 During the pressure stroke of the piston 7, the valve body 20 is lifted from its seat and the pressure fluid flows into the pressure lines 19. When the dead center is reached at the end of the pressure stroke, the pressure valve 18 closes. However, if the magnet (not shown) is energized, then the control piston 21 is withdrawn, as a result of which a connection is established between the pressure line 19 and the interior of the cylinder 9. 9
Dies bewirkt, daß beim Betrieb der Pumpe das Fördei— volumen jenes Zylinders bzw. Kolbens, dessen Druckventil 18 geöffnet ist, lediglich ausgeschoben und während des nachfol¬ genden Saughubes von der Druckleitung 19 her wieder eingescho¬ ben wird, sodaß dieses nicht wirksam wird. Dabei wird durch den auf den Ventilteller 14 des Saugventiles 13 von der Druck¬ leitung 19 her hinwirkenden Druck ein Öffnen des Saugventi¬ les 13 sicher verhindert, sodaß es zu keinen Leckverlusten über das Saugventil 13 kommen kann.This has the effect that, when the pump is in operation, the delivery volume of that cylinder or piston, the pressure valve 18 of which is open, is simply pushed out and pushed in again from the pressure line 19 during the subsequent suction stroke, so that this does not become effective. The pressure acting on the valve plate 14 of the suction valve 13 from the pressure line 19 reliably prevents the suction valve 13 from opening, so that there can be no leakage losses via the suction valve 13.
Die Zylinder 9, bzw. die Kolben 7 der Pumpe weisen unterschiedliche Durchmesser auf. Dies bewirkt, daß durch Zu- und Wegschalten einzelner oder mehrerer Zylinder 9 durch öff¬ nen der Verbindung zwischen dem Inneren der Zylinder und der Druckleitung 19 die Förderleistung der Pumpe variiert werden kann. Dabei ergeben sich z.B. bei dem dargestellten Beispiel mit fünf Zylindern 9 (Fig. 2) 24 verschiedene Leistungsstu¬ fen, oder bei sieben Zylindern 48 Leistungsstufen. Durch ent¬ sprechende Abstimmung der Durchmesser der einzelnen Zylinder und entsprechender Ansteuerung deren Steuerkolben 21 zum Her¬ stellen und Unterbinden einer Verbindung zwischen der Druck- leitung 19 und dem Inneren des Zylinders 9, sind Abstufungen der Förderleistung bei sieben Zylindern von ca. 2% zu 2% der Volleistung der Pumpe möglich.The cylinders 9 and the pistons 7 of the pump have different diameters. This means that by switching individual cylinders or several cylinders 9 on and off by opening the connection between the interior of the cylinders and the pressure line 19, the delivery capacity of the pump can be varied. For example, in the example shown with five cylinders 9 (FIG. 2) there are 24 different power levels, or 48 power levels with seven cylinders. By correspondingly coordinating the diameters of the individual cylinders and correspondingly controlling their control pistons 21 for producing and preventing a connection between the pressure line 19 and the interior of the cylinder 9, gradations of the delivery capacity with seven cylinders from about 2% to 2% of the full power of the pump are possible.
Durch die Abschaltung der Zylinder, bzw. der Unter¬ bindung deren Wirksamkeit durch das öffnen des Druckventi- les 18 ergibt sich auch der Vorteil, daß die Pulsation des Fördervolumens gleich, wie bei voller Förderleistung, also wenn alle Druckventile 18 geschlossen sind, bleibt. Es ändert sich dabei lediglich die Amplitude der Pulsation, die umso kleiner wird, je mehr Druckventile 18 geöffnet sind. Dies er¬ leichtert den Einsatz einer solchen Pumpe für Anwendungen, bei denen eine digitale Steuerung der Förderleistung der Pumpe vorgesehen ist, da in diesem Falle lediglich die entsprechen¬ den Druckventile 18 angesteuert werden müssen, wobei bei einer entsprechend großen Zylinderzahl eine sehr feinstufige Leis¬ tungssteuerung möglich ist.Switching off the cylinders and / or preventing their effectiveness by opening the pressure valve 18 also has the advantage that the pulsation of the delivery volume remains the same as when the delivery rate is full, that is to say when all of the pressure valves 18 are closed. Only the amplitude of the pulsation changes, the smaller the more pressure valves 18 are opened. This facilitates the use of such a pump for applications in which a digital control of the delivery capacity of the pump is provided, since in this case only the corresponding pressure valves 18 have to be actuated, with a very fine-tuned Leis¬ with a correspondingly large number of cylinders control is possible.
Patentansprüche: Claims:

Claims

Patentansprüche Claims
1. Radialkolbenpumpe mit einer Vielzahl von radial an¬ geordneten Zylinderkolbenanordnungen mit Saug- und Druckventi¬ len, deren Kolben von einer Exzenterscheibe gesteuert ist, die gegenüber einem die Zylinder haltenden Gehäuse exzentrisch um¬ läuft, dadurch gekennzeichne t , daß der Raum zwischen den Stirnseiten (12) der Zylinder (9) und den zugehörigen Kol¬ ben (7) über ein willkürlich steuerbares Ventil (21, 22) mit einer Druckleitung (19) der Pumpe verbindbar ist, wobei die Kolben (7) der Pumpe vorzugsweise unterschiedliche Durchmesser aufweisen .1. Radial piston pump with a plurality of radially arranged cylinder piston arrangements with suction and pressure valves, the piston of which is controlled by an eccentric disk which rotates eccentrically with respect to a housing holding the cylinders, characterized in that the space between the end faces (12) the cylinder (9) and the associated piston (7) can be connected to a pressure line (19) of the pump via an arbitrarily controllable valve (21, 22), the piston (7) of the pump preferably having different diameters .
2. Radialkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet , daß das steuerbare Ventil (21, 22) in einem Druckventil (18) angeordnet ist, wobei dessen Ventilkörper (20) hohl ausgebil¬ det und mit einer dem Zylinder (9) zugekehrten Öffnung (22) versehen ist, die von einem verschiebbar gehaltenen Steuerkol¬ ben (21) gesteuert ist, der unabhängig .von den Druck¬ verhältnissen im zugeordneten Zylinder (9) steuerbar ist. 2. Radial piston pump according to claim 1, characterized in that the controllable valve (21, 22) is arranged in a pressure valve (18), the valve body (20) of which is hollow and with an opening (22) facing the cylinder (9) ) is provided, which is controlled by a displaceably held control piston (21) which can be controlled independently of the pressure conditions in the assigned cylinder (9).
EP90914061A 1989-09-18 1990-09-18 Radial piston pump Expired - Lifetime EP0491809B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0217589A AT394892B (en) 1989-09-18 1989-09-18 RADIAL PISTON PUMP
AT2175/89 1989-09-18
PCT/AT1990/000093 WO1991004414A1 (en) 1989-09-18 1990-09-18 Radial piston pump

Publications (2)

Publication Number Publication Date
EP0491809A1 true EP0491809A1 (en) 1992-07-01
EP0491809B1 EP0491809B1 (en) 1994-02-02

Family

ID=3529334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90914061A Expired - Lifetime EP0491809B1 (en) 1989-09-18 1990-09-18 Radial piston pump

Country Status (5)

Country Link
EP (1) EP0491809B1 (en)
JP (1) JPH05500254A (en)
AT (2) AT394892B (en)
DE (1) DE59004529D1 (en)
WO (1) WO1991004414A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6183207B1 (en) 1998-05-18 2001-02-06 Sturman Industries, Inc. Digital pump
DE10252622A1 (en) * 2002-11-11 2004-05-27 Continental Teves Ag & Co. Ohg Motor pump aggregate for motor vehicle braking system has motor and pump that comprises shaft that is driven by motor and bearings of end of shaft are arranged in reception body that is provided with valves and connection channels
DE10356373A1 (en) 2003-12-03 2005-07-07 Obrist Engineering Gmbh reciprocating engine
CN102900470A (en) * 2011-07-25 2013-01-30 祁喜林 Radial engine
DE102023106706A1 (en) * 2023-03-17 2024-09-19 Thyssenkrupp Ag Radial piston compressor

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Publication number Priority date Publication date Assignee Title
FR344422A (en) * 1904-07-02 1904-11-04 Jean Bayard Fils Aine Automatic flow regulator for all motor driven pump systems
DE375514C (en) * 1920-09-19 1923-08-23 Giulio Silvestri Method and device for the gradual change in the delivery of multi-cylinder piston pumps
US2346987A (en) * 1940-11-09 1944-04-18 Honeywell Regulator Co Variable capacity compressor
CH258404A (en) * 1945-11-22 1948-11-30 Wirz Ernst Hydraulic control device on multiple piston pumps.
US5058553A (en) * 1988-11-24 1991-10-22 Nippondenso Co., Ltd. Variable-discharge high pressure pump

Non-Patent Citations (1)

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Title
See references of WO9104414A1 *

Also Published As

Publication number Publication date
EP0491809B1 (en) 1994-02-02
WO1991004414A1 (en) 1991-04-04
ATA217589A (en) 1991-12-15
AT394892B (en) 1992-07-10
DE59004529D1 (en) 1994-03-17
ATE101241T1 (en) 1994-02-15
JPH05500254A (en) 1993-01-21

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