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EP1013928A2 - Swash plate axial piston pump with pulsation damping means - Google Patents

Swash plate axial piston pump with pulsation damping means Download PDF

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Publication number
EP1013928A2
EP1013928A2 EP99124966A EP99124966A EP1013928A2 EP 1013928 A2 EP1013928 A2 EP 1013928A2 EP 99124966 A EP99124966 A EP 99124966A EP 99124966 A EP99124966 A EP 99124966A EP 1013928 A2 EP1013928 A2 EP 1013928A2
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EP
European Patent Office
Prior art keywords
channels
control
piston pump
axial piston
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.)
Withdrawn
Application number
EP99124966A
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German (de)
French (fr)
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EP1013928A3 (en
Inventor
Thomas Lehner
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.)
Parker Hannifin GmbH and Co KG
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Parker Hannifin GmbH and Co KG
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Application filed by Parker Hannifin GmbH and Co KG filed Critical Parker Hannifin GmbH and Co KG
Publication of EP1013928A2 publication Critical patent/EP1013928A2/en
Publication of EP1013928A3 publication Critical patent/EP1013928A3/en
Withdrawn legal-status Critical Current

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    • 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
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2042—Valves

Definitions

  • the invention relates to an axial piston pump in Swashplate construction with a driven rotating and a plurality of piston bores arranged therein having cylinder drum, in each case by Bars linearly separated piston bores between bottom dead center and top dead center movable pistons are arranged and a Low pressure connection kidney and a high pressure connection kidney having control disc is provided, and wherein the Piston bores through the cylinder drum alternating with the low pressure connection kidney and the High pressure connection kidneys are brought into overlap and the low-pressure connection kidney from the High-pressure connection kidney-separating web in the control disk paint over, and taking to avoid a Pressure pulsation in the connection plate one over each at least one channel with the sweeping Piston bore associated rerouting capacity is provided.
  • the invention is therefore based on the object Axial piston pump with the generic features that Continue to limit the occurrence of pulsations and a softer control of the piston bore in the Ensure high pressure connection kidney.
  • connection plate as well as in the in the control disc trained web for connecting the reversing capacity with at least the piston bores going over the web two channels are formed with associated outlet holes are.
  • the Invention associated with the piston bore s Outlet holes of the channels on the through the Low pressure connection kidney and the high pressure connection kidney arranged pitch circle arranged.
  • the outlet holes and the channels can optionally be one same or a different diameter exhibit.
  • Exit holes of the channels especially in two existing channels through a recess enclosing them connected to each other in the web of the control disc.
  • the exit holes which in each case from the rerouting capacity to the above the web formed by the control disc Piston bores formed channels with control notches and / or control notches are provided, whereby after a Embodiment of the invention in the direction of rotation Cylinder drum first exit hole with a longer one Control notch and one connecting to the exit hole shorter control notch is provided.
  • Cylinder drum first exit hole with a longer one Control notch and one connecting to the exit hole shorter control notch is provided.
  • with two channels in the connection plate and the web the second in the direction of rotation of the cylinder drum Exit hole with a shorter drive notch and one longer control notch is provided.
  • this depression with a Control notch and / or a control notch.
  • FIG Axial piston pump is one over a not shown Drive via a shaft 9 to be set in rotation Cylinder drum 10, in the outer area axially aligned piston bores 11 are arranged.
  • a piston 12 is linearly movable arranged, which on an end face of the cylinder drum 10th with a ball 13 in a pan 14 one outside of the Cylinder drum 10 arranged slide shoe 15 mounted is.
  • the slide shoe 15 runs on a stationary arranged swash plate 16 so that the rotation of the Cylinder drum 10 opposite the swash plate 16 in one linear movement, movement axially to the axis of rotation of the piston 12 can be implemented in the piston bore 11.
  • Control disc 20 On the face opposite the swash plate 16 the cylinder drum 10 is also fixed Control disc 20 arranged in which one over a partial circumference extending kidney 18 for the High pressure area is formed; not in this view a correspondingly trained is shown Low-pressure connection kidney 19, the connection kidneys 18, 19 through a web 26 in the control disk 20 (FIG. 2) are separated.
  • a reversal of the connection is shown schematically in FIG the piston bore 11 with the low-pressure connection kidney 19 on the one hand and the high-pressure connection kidney 18 on the other shown, the reversal via a Reversal capacity takes place.
  • This is in the connection plate 17 a reversing capacitance 23 is formed, of which two Lead channels 24 to the front of the cylinder drum 11 and each end in an exit hole 27 (FIGS. 3 to 5), A resistor 25 is in each case in the channels 24 switched on.
  • the Exit holes 27 with correspondingly arranged Control notches 28 or control notches 30 may be provided, wherein in the direction of rotation of the cylinder drum 10 of the Low-pressure connection kidney 19 to high-pressure connection kidney 18 the first exit hole 27 with a circumferential direction of the Control disc 20 having a longer extension Drive notch 28 and a shorter drive notch 30 is provided, while the one behind it in the direction of rotation Exit hole 27 first a shorter drive notch 28 and a longer one in the direction of the high-pressure connection kidney 18 Control notch 30 has.
  • This control and Dowel notches are in number, shape, location and size each variable and can thus be used to optimize the Reversal process can be designed accordingly.
  • FIG. 5 is an embodiment of the invention shown, in which the outlet holes 27 two Channels 24 via a recess 27 enclosing them are connected to each other, so that here too correspondingly soft control characteristic results.
  • the depression 29 can preferably be kidney-shaped trained and on the by the connection kidneys 18, 19th predetermined pitch circle can be arranged, in addition on Start and end of the specialization 29 control notches or Control notches can be provided.
  • outlet holes 27 and the channels 24 have the same or one have different diameters.
  • the Exit holes 27 with the adjoining channels 24 can also have a variable sequence Have diameters and they can vary Angular positions can be arranged to each other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Bei einer Axialkolbenpumpe in Schrägscheibenbauweise mit in der sich drehenden Zylindertrommel linear beweglichen Kolben und mit einer zur Vermeidung einer Druckpulsation in der Anschlußplatte eingerichteten Umsteuerkapazität soll die Druckpulsation weiter vermindert werden. Hierzu ist vorgesehen, daß in der Anschlußplatte (17) sowie in dem in der Steuerscheibe (20) ausgebildeten Steg (26) zur Verbindung der Umsteuerkapazität (23) mit den über den Steg (26) hinweggehenden Kolbenbohrungen (11) wenigstens zwei Kanäle (24) mit zugehörigen Austrittslöchern (27) ausgebildet sind.

Figure 00000001
In the case of an axial piston pump of swash plate design with pistons which can move linearly in the rotating cylinder drum and with a reversing capacity set up to avoid pressure pulsation in the connecting plate, the pressure pulsation is to be further reduced. For this purpose, it is provided that at least two channels (24) in the connecting plate (17) and in the web (26) formed in the control disk (20) for connecting the reversing capacity (23) to the piston bores (11) going beyond the web (26) ) are formed with associated outlet holes (27).
Figure 00000001

Description

Die Erfindung betrifft eine Axialkolbenpumpe in Schrägscheibenbauweise mit einer angetrieben umlaufenden und eine Mehrzahl von darin angeordneten Kolbenbohrungen aufweisenden Zylindertrommel, wobei in den jeweils durch Stege voneinander getrennten Kolbenbohrungen linear zwischen einem unteren Totpunkt und einem oberen Totpunkt bewegliche Kolben angeordnet sind und eine eine Niederdruckanschlußniere und eine Hochdruckanschlußniere aufweisende Steuerscheibe vorgesehen ist, und wobei die Kolbenbohrungen durch den Umlauf der Zylindertrommel abwechselnd mit der Niederdruckanschlußniere und der Hochdruckanschlußniere in Überdeckung gebracht werden und dabei einen die Niederdruckanschlußniere von der Hochdruckanschlußniere trennenden Steg in der Steuerscheibe überstreichen, und wobei zur Vermeidung einer Druckpulsation in der Anschlußplatte eine über jeweils wenigstens einen Kanal mit der überstreichenden Kolbenbohrung verbundene Umsteuerkapazität vorgesehen ist.The invention relates to an axial piston pump in Swashplate construction with a driven rotating and a plurality of piston bores arranged therein having cylinder drum, in each case by Bars linearly separated piston bores between bottom dead center and top dead center movable pistons are arranged and a Low pressure connection kidney and a high pressure connection kidney having control disc is provided, and wherein the Piston bores through the cylinder drum alternating with the low pressure connection kidney and the High pressure connection kidneys are brought into overlap and the low-pressure connection kidney from the High-pressure connection kidney-separating web in the control disk paint over, and taking to avoid a Pressure pulsation in the connection plate one over each at least one channel with the sweeping Piston bore associated rerouting capacity is provided.

Der Aufbau einer gattungsgemäßen Axialkolbenpumpe ist in der Veröffentlichung

Figure 00020001
Maßnahmen zur Minderung hochdruckseitiger Pulsationen hydrostatischer Schrägscheibeneinheiten" von Marcus Jarchow, Dissertation 1997, Technische Hochschule Aachen, Verlag Mainz, Aachen, im einzelnen beschrieben. Die Veröffentlichung befaßt sich dabei insbesondere mit dem Problem hochdruckseitiger Pulsationen und beschreibt auf Seiten 70 ff eine Lösung dieses Problems mittels einer Umsteuerkapazität. Danach ist es zur Vermeidung von Kompressionsölströmen beim Einsteuern jeder einzelnen Kolbenbohrung der Zylindertrommel in die Hochdruckanschlußniere notwendig, den in der Kolbenbohrung sich durch die Verdichtungsbewegung des Kolbens einstellenden Druck an den auf der Hochdruckseite des Steuerbodens in dessen Hochdruckanschlußniere herrschenden Druck anzugleichen. Dies geschieht bei dem Einsatz einer Umsteuerkapazität mittels Zufuhr von unter Hochdruck stehendem Kompressionsöl in die Kolbenbohrung, wobei die in dem Steuerboden ausgebildete Umsteuerkapazität dazu einerseits über einen Kanal an die Kolbenbohrungen der umlaufenden Zylindertrommel und andererseits über einen weiteren Kanal an die Hochdruckanschlußniere zum jeweiligen Auffüllen der Umsteuerkapazität angeschlossen ist. The structure of a generic axial piston pump is in the publication
Figure 00020001
Measures to reduce high-pressure side pulsations of hydrostatic swashplate units "by Marcus Jarchow, dissertation 1997, Technical University Aachen, Verlag Mainz, Aachen, described in detail. The publication deals in particular with the problem of high-pressure side pulsations and describes on page 70 ff a solution to this problem by means of According to this, in order to avoid compression oil flows when entering each individual piston bore of the cylinder drum into the high-pressure connection kidney, it is necessary to adjust the pressure in the piston bore due to the compression movement of the piston to the pressure prevailing on the high-pressure side of the control floor in its high-pressure connection kidney when using a reversing capacity by supplying high-pressure compression oil into the piston bore, the reversing capacity formed in the control base being used on the one hand he is connected to the piston bores of the rotating cylinder drum and on the other hand via a further channel to the high-pressure connection kidney for filling up the reversing capacity.

Mit einer derartigen Ausgestaltung ist noch der Nachteil verbunden, daß die unerwünschten hochdruckseitigen Pulsationen in abgeschwächter Form weiterhin auftreten, da mit der Freigabe des von der Umsteuerkapazität wegführenden Kanals durch jeweils einen zwischen den Kolbenbohrungen verlaufenden Steg eine schlagartige Beaufschlagung der Kolbenbohrung mit dem unter Hochdruck von der Umsteuerkapazität zufließenden Kompressionsöl erfolgt, die sich umso mehr in Pulsationen äußert, je niedriger zu diesem Zeitpunkt der jeweils in der Kolbenbohrung von dem dort befindlichen Kolben bei dessen Verdichtungshub erzeugte Druckzustand ist.With such a configuration there is still the disadvantage connected that the undesirable high-pressure side Pulsations in a weakened form continue to occur because with the release of the one leading away from the reversing capacity Channel through one between the piston bores running web a sudden loading of the Piston bore with the high pressure from the Reversing capacity inflowing compression oil takes place manifests itself in pulsations, the lower to this point in time in the piston bore of the piston located there during its compression stroke generated pressure state is.

Der Erfindung liegt daher die Aufgabe zugrunde, bei einer Axialkolbenpumpe mit den gattungsgemäßen Merkmalen das Auftreten von Pulsationen weiterhin einzuschränken und ein weicheres Einsteuern der Kolbenbohrung in die Hochdruckanschlußniere sicherzustellen.The invention is therefore based on the object Axial piston pump with the generic features that Continue to limit the occurrence of pulsations and a softer control of the piston bore in the Ensure high pressure connection kidney.

Die Lösung dieser Aufgabe ergibt sich einschließlich vorteilhafter Ausgestaltungen und Weiterbildungen der Erfindung aus dem Inhalt der Patentansprüche, welche dieser Beschreibung nachgestellt sind.The solution to this problem is inclusive advantageous refinements and developments of Invention from the content of the claims, which this Description are reproduced.

Die Erfindung sieht in ihrem Grundgedanken vor, daß in der Anschlußplatte sowie in dem in der Steuerscheibe ausgebildeten Steg zur Verbindung der Umsteuerkapazität mit den über den Steg hinweggehenden Kolbenbohrungen wenigstens zwei Kanäle mit zugehörigen Austrittslöchern ausgebildet sind. The basic idea of the invention provides that in the Connection plate as well as in the in the control disc trained web for connecting the reversing capacity with at least the piston bores going over the web two channels are formed with associated outlet holes are.

Nach einem Ausführungsbeispiel der Erfindung ist vorgesehen, daß eine größere Anzahl von Kanälen zur Verbindung der Umsteuerkapazität mit den Kolbenbohrungen vorgesehen ist.According to an embodiment of the invention provided that a larger number of channels for Connection of the reversing capacity with the piston bores is provided.

Zweckmäßig sind nach einem Ausführungsbeispiel der Erfindung die den Kolbenbohrungen zugeordneten Austrittslöcher der Kanäle auf dem durch die Niederdruckanschlußniere und die Hochdruckanschlußniere gebildeten Teilkreis angeordnet.According to an embodiment, the Invention associated with the piston bores Outlet holes of the channels on the through the Low pressure connection kidney and the high pressure connection kidney arranged pitch circle arranged.

Wahlweise können die Austrittslöcher und die Kanäle einen gleichen oder auch einen unterschiedlichen Durchmesser aufweisen.The outlet holes and the channels can optionally be one same or a different diameter exhibit.

Gemäß einer Ausführungsform der Erfindung sind die Austrittslöcher der Kanäle insbesondere bei zwei vorhandenen Kanälen über eine sie einschließende Vertiefung in dem Steg der Steuerscheibe miteinander verbunden.According to one embodiment of the invention Exit holes of the channels, especially in two existing channels through a recess enclosing them connected to each other in the web of the control disc.

Zur weiteren Verbesserung eines möglichst weichen Einsteuerns kann vorgesehen sein, daß die Austrittslöcher der jeweils von der Umsteuerkapazität zu den über den an der Steuerscheibe ausgebildeten Steg hinweggehenden Kolbenbohrungen ausgebildeten Kanäle mit Ansteuerkerben und/oder Aussteuerkerben versehen sind, wobei nach einem Ausführungsbeispiel der Erfindung das in Drehrichtung der Zylindertrommel erste Austrittsloch mit einer längeren Ansteuerkerbe und einer an das Austrittsloch anschließenden kürzeren Aussteuerkerbe versehen ist. Ergänzend kann vorgesehen sein, daß bei zwei Kanälen in der Anschlußplatte und dem Steg das in Drehrichtung der Zylindertrommel zweite Austrittsloch mit einer kürzeren Ansteuerkerbe und einer längeren Aussteuerkerbe versehen ist. Ebenso kann bei Ausbildung einer die Austrittslöcher der Kanäle in sich einschließenden Vertiefung diese Vertiefung mit einer Ansteuerkerbe und/oder einer Aussteuerkerbe versehen sein.To further improve a soft as possible Control can be provided that the exit holes which in each case from the rerouting capacity to the above the web formed by the control disc Piston bores formed channels with control notches and / or control notches are provided, whereby after a Embodiment of the invention in the direction of rotation Cylinder drum first exit hole with a longer one Control notch and one connecting to the exit hole shorter control notch is provided. In addition can be provided that with two channels in the connection plate and the web the second in the direction of rotation of the cylinder drum Exit hole with a shorter drive notch and one longer control notch is provided. Likewise, at Formation of the exit holes of the channels in themselves enclosing depression this depression with a Control notch and / or a control notch.

In der Zeichnung sind Ausführungsbeispiel der Erfindung wiedergegeben, welche nachstehend beschrieben sind. Es zeigen:

Fig. 1
eine Axialkolbenpumpe in Schrägscheibenbauweise in einer schematischen Darstellung,
Fig. 2
die Umsteuerung des Kolbens unter Einschluß einer zugeordneten Umsteuerkapazität,
Fig. 3
eine Draufsicht auf die feststehende Steuerscheibe mit der Anordnung der Austrittslöcher der zur Verbindung der Kolbenbohrungen mit der Umsteuerkapazität vorgesehenen Kanäle,
Fig. 4
den Gegenstand der Figur 3 in einer anderen Ausführungsform,
Fig. 5
eine weitere Ausführungsform des Gegenstandes der Figuren 3 bzw. 4.
In the drawing, embodiment of the invention are shown, which are described below. Show it:
Fig. 1
an axial piston pump in swash plate construction in a schematic representation,
Fig. 2
reversing the piston, including an assigned reversing capacity,
Fig. 3
a plan view of the fixed control disc with the arrangement of the outlet holes of the channels provided for connecting the piston bores with the reversing capacity,
Fig. 4
the object of Figure 3 in another embodiment,
Fig. 5
a further embodiment of the subject matter of FIGS. 3 and 4.

Wesentlicher Bestandteil der in Figur 1 dargestellten Axialkolbenpumpe ist eine über einen nicht dargestellten Antrieb über eine Welle 9 in Drehung zu versetzende Zylindertrommel 10, in deren äußeren Bereich axial ausgerichtete Kolbenbohrungen 11 angeordnet sind. In den Kolbenbohrungen 11 ist ein Kolben 12 linear beweglich angeordnet, der an einer Stirnseite der Zylindertrommel 10 mit einer Kugel 13 in einer Pfanne 14 eines außerhalb der Zylindertrommel 10 angeordneten Gleitschuhs 15 gelagert ist. Der Gleitschuh 15 läuft auf einer ortsfest angeordneten Schrägscheibe 16, so daß die Drehung der Zylindertrommel 10 gegenüber der Schrägscheibe 16 in eine lineare Bewegung, axial zur Drehachse gerichtete Bewegung des Kolbens 12 in der Kolbenbohrung 11 umsetzbar ist.An essential part of that shown in FIG Axial piston pump is one over a not shown Drive via a shaft 9 to be set in rotation Cylinder drum 10, in the outer area axially aligned piston bores 11 are arranged. In the Piston bores 11, a piston 12 is linearly movable arranged, which on an end face of the cylinder drum 10th with a ball 13 in a pan 14 one outside of the Cylinder drum 10 arranged slide shoe 15 mounted is. The slide shoe 15 runs on a stationary arranged swash plate 16 so that the rotation of the Cylinder drum 10 opposite the swash plate 16 in one linear movement, movement axially to the axis of rotation of the piston 12 can be implemented in the piston bore 11.

Auf der der Schrägscheibe 16 gegenüberliegenden Stirnseite der Zylindertrommel 10 ist ebenfalls feststehend eine Steuerscheibe 20 angeordnet, in welcher eine sich über einen Teilumfang erstreckende Anschlußniere 18 für den Hochdruckbereich ausgebildet ist; in dieser Ansicht nicht dargestellt ist eine entsprechend ausgebildete Niederdruckanschlußniere 19, wobei die Anschlußnieren 18, 19 durch einen Steg 26 in der Steuerscheibe 20 (Figur 2) getrennt sind.On the face opposite the swash plate 16 the cylinder drum 10 is also fixed Control disc 20 arranged in which one over a partial circumference extending kidney 18 for the High pressure area is formed; not in this view a correspondingly trained is shown Low-pressure connection kidney 19, the connection kidneys 18, 19 through a web 26 in the control disk 20 (FIG. 2) are separated.

In Figur 2 ist schematisch eine Umsteuerung der Verbindung der Kolbenbohrung 11 mit der Niederdruckanschlußniere 19 einerseits und der Hochdruckanschlußniere 18 andererseits dargestellt, wobei die Umsteuerung über eine Umsteuerkapazität erfolgt. Hierzu ist in der Anschlußplatte 17 eine Umsteuerkapazität 23 ausgebildet, von der zwei Kanäle 24 zur Stirnseite der Zylindertrommel 11 führen und hier in je einem Austrittsloch 27 münden (Figuren 3 bis 5), In die Kanäle 24 ist jeweils ein Widerstand 25 eingeschaltet. A reversal of the connection is shown schematically in FIG the piston bore 11 with the low-pressure connection kidney 19 on the one hand and the high-pressure connection kidney 18 on the other shown, the reversal via a Reversal capacity takes place. This is in the connection plate 17 a reversing capacitance 23 is formed, of which two Lead channels 24 to the front of the cylinder drum 11 and each end in an exit hole 27 (FIGS. 3 to 5), A resistor 25 is in each case in the channels 24 switched on.

Aus Figur 2 ist der Steuerungsablauf anhand von drei in der Zylindertrommel 10 nebeneinander angeordneten Kolbenbohrungen 11 mit darin liegenden Kolben 12 ersichtlich, wobei die Kolbenbohrungen 11 jeweils durch Stege 21 voneinander getrennt sind. In der linken Darstellung ist die zugeordnete Kolbenbohrung 11 mit der Niederdruckanschlußniere 19 verbunden, wobei sich der Kolben 12 noch in Richtung seines unteren Totpunktes bewegt, so daß aus der Niederdruckanschlußniere 19 Öl angesaugt wird. Der mittlere Ausschnitt läßt erkennen, daß der Kolben 12 nunmehr im unteren Totpunkt 22 steht, und in dieser Stellung ist das Austrittsloch 27 des Kanals 24 durch den Steg 21 verschlossen. In der rechten Darstellung ist die zugehörige Kolbenbohrung 11 bereits während des Verdichtungshubes des Kolbens 12 in Richtung auf seinen oberen Totpunkt mit der Hochdruckanschlußniere 18 verbunden. Kommt es nun bei einer Drehung der Zylindertrommel 10 zu einer Freigabe des Austrittsloches 27 der Kanäle 24, so wird mit beginnendem Kolbenhub in der mittleren Kolbenbohrung 11 der Druck erhöht, und aufgrund der Freigabe der Kanäle 24 wird zunächst über die Zufuhr von Kompressionsöl aus der Umsteuerkapazität 23 der Druck in der mittleren Kolbenbohrung 11 so weit erhöht, daß bei einer nachfolgenden Verbindung dieser mittleren Kolbenbohrung 11 mit der Hochdruckanschlußniere 18 der Druckstoß und damit die Pulsation bei umlaufender Zylindertrommel 10 entsprechend vermindert ist.From Figure 2, the control process is based on three in the Cylinder drum 10 arranged side by side Piston bores 11 with pistons 12 therein can be seen, the piston bores 11 each through Crosspieces 21 are separated from one another. In the left Representation is the associated piston bore 11 with the Low pressure connection kidney 19 connected, the Piston 12 still towards its bottom dead center moved so that 19 oil from the low pressure connection kidney is sucked in. The middle section shows that the piston 12 is now at bottom dead center 22, and in this position is the exit hole 27 of the channel 24 closed by the web 21. In the right representation is the associated piston bore 11 already during the Compression stroke of the piston 12 in the direction of its top dead center with the high-pressure connection kidney 18 connected. Now it comes with a rotation of the Cylinder drum 10 to release the exit hole 27 the channels 24, so with the beginning of the piston stroke in the middle piston bore 11, the pressure increases, and due The release of the channels 24 is initially via the feed of compression oil from the reversing capacity 23 the pressure in the middle piston bore 11 increased so much that a subsequent connection of these middle ones Piston bore 11 with the high pressure connection kidney 18 Pressure surge and thus the pulsation with rotating Cylinder drum 10 is reduced accordingly.

Die erfindungsgemäße Anordnung von zwei oder mehr Kanälen 24 ist nun in den Figuren 3 bis 5 im einzelnen dargestellt. The arrangement according to the invention of two or more channels 24 is now shown in detail in FIGS. 3 to 5.

Wie aus Figur 3 ersichtlich, können in dem die Niederdruckanschlußniere 19 und die Hochdruckanschlußniere 18 voneinander trennenden Steg 26 der Steuerscheibe 20 zwei Austrittslöcher 27 von zugeordneten Kanälen 24 angeordnet sein, die auf dem durch die Anschlußnieren 18, 19 vorgegebenen Teilkreis angeordnet sind.As can be seen from Figure 3, the Low pressure connection kidney 19 and the high pressure connection kidney 18 separating web 26 of the control disk 20 two Exit holes 27 are arranged from assigned channels 24 be on the by the connection kidneys 18, 19th predetermined pitch circle are arranged.

Wie sich aus Figur 4 entnehmen läßt, können die Austrittslöcher 27 mit entsprechend angeordneten Ansteuerkerben 28 bzw. Aussteuerkerben 30 versehen sein, wobei in Drehrichtung der Zylindertrommel 10 von der Niederdruckanschlußniere 19 zur Hochdruckanschlußniere 18 das erste Austrittsloch 27 mit einer in Umfangsrichtung des Steuerscheibe 20 eine längere Erstreckung aufweisenden Ansteuerkerbe 28 und einer kürzeren Aussteuerkerbe 30 versehen ist, während das in Drehrichtung dahinterliegende Austrittsloch 27 zunächst eine kürzere Ansteuerkerbe 28 und in Richtung der Hochdruckanschlußniere 18 eine längere Aussteuerkerbe 30 aufweist. Diese Ansteuer- und Aussteuerkerben sind in Anzahl, Form, Lage und Größe jeweils variabel und können damit zur Optimierung des Umsteuervorganges entsprechend ausgelegt werden.As can be seen from Figure 4, the Exit holes 27 with correspondingly arranged Control notches 28 or control notches 30 may be provided, wherein in the direction of rotation of the cylinder drum 10 of the Low-pressure connection kidney 19 to high-pressure connection kidney 18 the first exit hole 27 with a circumferential direction of the Control disc 20 having a longer extension Drive notch 28 and a shorter drive notch 30 is provided, while the one behind it in the direction of rotation Exit hole 27 first a shorter drive notch 28 and a longer one in the direction of the high-pressure connection kidney 18 Control notch 30 has. This control and Dowel notches are in number, shape, location and size each variable and can thus be used to optimize the Reversal process can be designed accordingly.

In Figur 5 ist ein Ausführungsbeispiel der Erfindung dargestellt, bei welchem die Austrittslöcher 27 zweier Kanäle 24 über eine sie einschließende Vertiefung 27 miteinander verbunden sind, so daß sich auch hier eine entsprechend weiche Ansteuercharakteristik ergibt. Vorzugsweise kann die Vertiefung 29 nierenförmig ausgebildet und auf dem durch die Anschlußnieren 18, 19 vorgegebenen Teilkreis angeordnet sein, wobei zusätzlich am Anfang und Ende der Vertiefung 29 Ansteuerkerben bzw. Aussteuerkerben vorgesehen sein können.In Figure 5 is an embodiment of the invention shown, in which the outlet holes 27 two Channels 24 via a recess 27 enclosing them are connected to each other, so that here too correspondingly soft control characteristic results. The depression 29 can preferably be kidney-shaped trained and on the by the connection kidneys 18, 19th predetermined pitch circle can be arranged, in addition on Start and end of the specialization 29 control notches or Control notches can be provided.

Wie nicht weiter dargestellt, können die Austrittslöcher 27 und die Kanäle 24 einen gleichen oder auch einen unterschiedlichen Durchmesser aufweisen. Die Austrittslöcher 27 mit den daran anschließenden Kanälen 24 können ebenfalls in ihrer Abfolge einen variablen Durchmesser aufweisen und sie können in variablen Winkellagen zueinander angeordnet sein.As not shown further, the outlet holes 27 and the channels 24 have the same or one have different diameters. The Exit holes 27 with the adjoining channels 24 can also have a variable sequence Have diameters and they can vary Angular positions can be arranged to each other.

Die in der vorstehenden Beschreibung, den Patentansprüchen, der Zusammenfassung und der Zeichnung offenbarten Merkmale des Gegenstandes dieser Unterlagen können einzeln als auch in beliebigen Kombinationen untereinander für die Verwirklichung der Erfindung in ihren verschiedenen Ausführungsformen wesentlich sein.The in the above description, the claims, the summary and the drawing disclosed features The subject matter of these documents can be used individually as well in any combination with each other for the Realization of the invention in its various Embodiments may be essential.

Claims (10)

Axialkolbenpumpe in Schrägscheibenbauweise mit einer angetrieben umlaufenden und eine Mehrzahl von darin angeordneten Kolbenbohrungen aufweisenden Zylindertrommel, wobei in den jeweils durch Stege voneinander getrennten Kolbenbohrungen linear zwischen einem unteren Totpunkt und einem oberen Totpunkt bewegliche Kolben angeordnet sind und eine eine Niederdruckanschlußniere und eine Hochdruckanschlußniere aufweisende Steuerscheibe vorgesehen ist, und wobei die Kolbenbohrungen durch den Umlauf der Zylindertrommel abwechselnd mit der Niederdruckanschlußniere und der Hochdruckanschlußniere in Überdeckung gebracht werden und dabei einen die Niederdruckanschlußniere von der Hochdruckanschlußniere trennenden Steg in der Steuerscheibe überstreichen, und wobei zur Vermeidung einer Druckpulsation in der Anschlußplatte eine über jeweils wenigstens einen Kanal mit der überstreichenden Kolbenbohrung verbundene Umsteuerkapazität vorgesehen ist, dadurch gekennzeichnet, daß in der Anschlußplatte (17) sowie in dem in der Steuerscheibe (20) ausgebildeten Steg (26) zur Verbindung der Umsteuerkapazität (23) mit den über den Steg (26) hinweggehenden Kolbenbohrungen (11) wenigstens zwei Kanäle (24) mit zugehörigen Austrittslöchern (27) ausgebildet sind.Swashplate type axial piston pump with one driven revolving and a plurality of therein arranged piston bores Cylinder drum, in each case by webs separate piston bores linearly between a bottom dead center and an upper dead center movable pistons are arranged and a Low pressure connection kidney and one Control disc with high-pressure connection kidney is provided, and wherein the piston bores through the Rotation of the cylinder drum alternately with the Low pressure connection kidney and the high pressure connection kidney be brought into coverage and thereby one Low pressure connection kidney from the high pressure connection kidney paint over the separating web in the control disc, and being to avoid pressure pulsation in the Connection plate one over at least one channel connected to the sweeping piston bore Reversal capacity is provided, thereby characterized in that in the connection plate (17) and in the web (26) formed in the control disk (20) to connect the reversing capacity (23) with the over piston bores (11) going beyond the web (26) at least two channels (24) with associated Exit holes (27) are formed. Axialkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß mehr als zwei Kanäle (24) zwischen der Umsteuerkapazität (23) und den überstreichenden Kolbenbohrungen (11) ausgebildet sind.Axial piston pump according to claim 1, characterized characterized in that more than two channels (24) between the reversing capacity (23) and the sweeping Piston bores (11) are formed. Axialkolbenpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die den Kolbenbohrungen (11) zugeordneten Austrittslöcher (27) der Kanäle (24) auf dem durch die Niederdruckanschlußniere (19) und die Hochdruckanschlußniere (18) gebildeten Teilkreis angeordnet sind.Axial piston pump according to claim 1 or 2, characterized characterized in that the piston bores (11) assigned outlet holes (27) of the channels (24) by the low pressure connection kidney (19) and High pressure connection kidney (18) formed circle are arranged. Axialkolbenpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Austrittslöcher (27) und die Kanäle (24) einen gleichen Durchmesser aufweisen.Axial piston pump according to one of claims 1 to 3, characterized in that the outlet holes (27) and the channels (24) have the same diameter exhibit. Axialkolbenpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Austrittslöcher (27) und die Kanäle (24) einen unterschiedlichen Durchmesser aufweisen. Axial piston pump according to one of claims 1 to 3, characterized in that the outlet holes (27) and the channels (24) have a different diameter exhibit. Axialkolbenpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Austrittslöcher (27) der Kanäle (24) über eine sie einschließende Vertiefung (29) im dem Steg (26) der Steuerscheibe (20) miteinander verbunden sind.Axial piston pump according to one of claims 1 to 5, characterized in that the outlet holes (27) the channels (24) via a recess enclosing them (29) in the web (26) of the control disk (20) are interconnected. Axialkolbenpumpe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Austrittslöcher (27) der Kanäle (24) in dem Steg (26) der Steuerscheibe (20) mit Ansteuerkerben (28) und/oder mit Aussteuerkolben (30) versehen sind.Axial piston pump according to one of claims 1 to 6, characterized in that the outlet holes (27) the channels (24) in the web (26) of the control disc (20) with control notches (28) and / or with control pistons (30) are provided. Axialkolbenpumpe nach Anspruch 7, dadurch gekennzeichnet, daß das in Drehrichtung der Zylindertrommel (10) erste Austrittsloch (27) mit einer längeren Ansteuerkerbe (28) und einer an das Austrittsloch (27) anschließenden kürzeren Aussteuerkerbe (30) versehen ist.Axial piston pump according to claim 7, characterized characterized in that the direction of rotation of the Cylinder drum (10) with a first exit hole (27) longer control notch (28) and one to the Exit hole (27) then shorter Control notch (30) is provided. Axialkolbenpumpe nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß bei zwei Kanälen (24) in der Anschlußplatte (17) und dem Steg (26) das in Drehrichtung der Zylindertrommel (10) zweite Austrittsloch (27) mit einer kürzeren Ansteuerkerbe (28) und einer längeren Aussteuerkerbe (30) versehen ist.Axial piston pump according to claim 7 or 8, characterized characterized in that with two channels (24) in the Connection plate (17) and the web (26) in Direction of rotation of the cylinder drum (10) second Exit hole (27) with a shorter control notch (28) and a longer control notch (30) is. Axialkolbenpumpe nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß die Vertiefung (29) mit einer Ansteuerkerbe (28) und/oder einer Aussteuerkerbe (30) versehen ist.Axial piston pump according to one of claims 6 or 7, characterized in that the recess (29) with a control notch (28) and / or a control notch (30) is provided.
EP99124966A 1998-12-22 1999-12-15 Swash plate axial piston pump with pulsation damping means Withdrawn EP1013928A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19859328 1998-12-22
DE19859328 1998-12-22

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