EP2410179A1 - Adjustment agent for a set piston, set piston and hydraulic machine - Google Patents

Adjustment agent for a set piston, set piston and hydraulic machine Download PDF

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Publication number
EP2410179A1
EP2410179A1 EP11001065A EP11001065A EP2410179A1 EP 2410179 A1 EP2410179 A1 EP 2410179A1 EP 11001065 A EP11001065 A EP 11001065A EP 11001065 A EP11001065 A EP 11001065A EP 2410179 A1 EP2410179 A1 EP 2410179A1
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EP
European Patent Office
Prior art keywords
adjusting
piston
adjusting means
hydraulic
latching
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Granted
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EP11001065A
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German (de)
French (fr)
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EP2410179B1 (en
Inventor
Michael Deeken
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Liebherr Machines Bulle SA
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Liebherr Machines Bulle SA
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Publication of EP2410179A1 publication Critical patent/EP2410179A1/en
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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
    • F04B1/26—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
    • 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
    • F04B1/26—Control
    • F04B1/30—Control of machines or pumps with rotary cylinder blocks
    • F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate

Definitions

  • the present invention relates to an adjusting means for an actuating piston, an actuating piston with at least one adjusting means and a hydraulic machine, in particular an axial piston pump or an axial piston motor.
  • hydraulic drives serve, for example, as travel drive, slewing gear drive and / or drive for winches or other tools of the construction machine and include, for example, an axial piston pump or an axial piston motor.
  • Known hydraulic drives have adjusting screws for adjusting the operating characteristics, wherein the adjusting screw z. B. defines a stop for the minimum flow of the axial piston pump or the axial piston motor.
  • This adjusting screw (see also FIG. 1 ) is set during a test run and when the device is taken off. The minimum flow rate (Q min ) is thereby determined. After that, however, no adjustment is possible during operation. Any adjustments in operation are so far only possible by means of electronic control means consuming. However, these systems disadvantageously tend to oscillate and may have degraded efficiency.
  • the adjusting means for an actuating piston is designed such that the adjusting means comprises at least one adjusting means by which the movement of the actuating piston can be limited and wherein the adjusting means of an at least first position in at least one second position and / or vice versa by means of at least one drive means is adjustable.
  • the use of the drive means in particular has the advantage that a setting with the aim of limiting the movement of the actuating piston is also possible during operation.
  • this setting the tendency to oscillate of the entire system can be advantageously reduced and the efficiency can be increased, since in particular a demand-based adjustment of the minimum flow (Q min ) or the minimum flow (Q max ) is now possible by the actuator piston.
  • the drive means may be, for example, a stepper motor or other drive. It is conceivable that the drive is a hydraulic, electrical and / or mechanical drive.
  • the drive means is and / or comprises a hydraulic drive means, by means of which the adjusting means is adjustable from at least a first position to at least a second position and / or vice versa, wherein the hydraulic drive means is or comprises a hydraulic pump.
  • the adjusting means is an adjusting bolt and / or comprises, wherein preferably the adjusting bolt projects into the piston chamber of the actuating piston and forms a stop surface for the piston of the actuating piston.
  • the stop surface can be easily and reliably a limitation of the piston stroke and the piston movement of the actuating piston can be achieved.
  • the adjusting means hydraulically indirectly and / or directly latched and / or is releasable from a latch, wherein preferably the adjusting means in the first and / or second position is hydraulically latched by means of a Verrastungsffens. It is conceivable, for example, that a locking is brought about by applying a latching pressure.
  • Verrastungsmittels is released from the latching by applying the Verrastungstiks or Entrastungstiks, so the latching is secured without pressure, for example by spring force.
  • the latching means has at least one hydraulically activatable, preferably spring-loaded, latching bolt and wherein the latching bolt in the at least one first and at least one second position can be latched in each case in a Verrastungsposition.
  • Verrastungsbolzen are provided. It can be provided that the one or more Verrastungsbolzen are arranged and guided in recesses in the adjustment. By extending The locking bolt can thereby be brought about a simple and secure locking.
  • the latching means is designed so self-adjusting that it automatically engages in the approached Verrastungsposition.
  • the Verrastungsposition be formed rounded so that the locking pin designed as a counterpart snaps self-adjusting due to the shape in the Verrastungsposition.
  • the adjusting means comprises at least a first hydraulic pumping means by means of which the adjusting means is adjustable, and at least a second hydraulic pumping means, by means of which the latching means is releasable and / or latched.
  • the adjusting piston of the adjusting piston of a hydraulic machine and that by means of the adjusting means a minimum and / or maximum volume flow in the hydraulic machine is adjustable.
  • the setting is preferably carried out by limiting or expanding the piston stroke, so that a simple adjustment of the minimum flow (Q min ) or the minimum flow (Q max ) is possible.
  • an actuating piston in particular an actuating piston of a hydraulic machine such as an axial piston pump or an axial piston motor, is provided with at least one adjusting means according to one of claims 1 to 8.
  • the present invention relates to a hydraulic machine with the features of claim 10. Thereafter, it is provided that a hydraulic machine is provided with at least one actuating means according to one of claims 1 to 8 and / or an actuating piston according to claim 9.
  • the hydraulic machine is preferably an axial piston pump or an axial piston motor, as used, for example, in construction machines.
  • the axial piston pump or the axial piston motor may be the drive of a winch or the travel drive of a construction machine. Even with a double motor comprising axial piston pumps on a drill head, it is particularly advantageous if the rotational speed of the motor during operation can be reduced by setting the minimum flow rate (Q min ) as required by the actuating piston.
  • the construction machine is a slow-moving construction machine such as an excavator.
  • a drive motor of a wheeled excavator it is advantageous if the rotational speed of the motor during operation can be reduced by a demand-oriented adjustment of the minimum flow (Q min ) through the actuating piston of the axial piston motor serving as drive motor.
  • FIG. 1 shows a sectional view of a known actuating cylinder 20 for an axial piston pump 10 of a construction machine, not shown.
  • Suction volume can be adjusted via the adjustment of the swivel yoke or the swivel cradle.
  • the actuating piston 22 of the actuating cylinder 20 has an adjusting screw 30 which defines the stop 32 for the minimum flow of the axial piston pump. Because the actuator piston 20 is limited in its stroke by the stop 32.
  • This adjustment screw 30 is adjusted during a test run and when the device is removed.
  • the minimum flow rate (Q min ) is thereby determined.
  • the adjusting screw 30 is therefore also referred to as Q min stop. After the adjustment of the stop 32 and in particular during operation, however, no adjustment is possible.
  • the hydraulically adjustable adjusting means comprises a small adjusting piston 110, the position of which can be adjusted by a first pump 120.
  • the adjusting piston 110 protrudes with its one end into the actuating cylinder 20 'and thereby defines a stop 32' for the actuating piston 22 '.
  • the adjusting piston 110 can be adjusted in three positions 132, 134, 136, each corresponding to a predefined Q min value. It is equally possible that each position corresponds to a predefined Q max value.
  • Each position 132, 134 and 136 is assigned to a latching position 142, 144, 146 or latching recess 142, 144, 146, into which the two latching bolts 130 can engage.
  • the latching positions 142, 144, 146 are arranged in the cylinder housing 25 of the actuating cylinder 20 ', wherein the cylinder housing 25' is also the housing of the adjusting piston 110.
  • the two locking pins 130 are received in recesses 139 in the adjusting piston 110.
  • the locking pins 130 are arranged perpendicularly and radially to the axial direction of the adjusting piston 110.
  • the locking bolts 130 are released by the springs 138, which are tensioned by the application of the latching pressure.
  • the springs 138 are arranged in such a way that they latch the latching bolts 130 in the unpressurized state and that the latching bolts 130 are released by the application of a pressure by means of the pump 150.
  • the detent positions 142, 144 and 146 are shaped such that the locking pin 130 self-aligning in the approached detent position 142, 144, 146 engages. In the present case, this is achieved in that the locking bolts 130 are rounded and the rounded end engages in the locking position 142, 144, 146 formed as a counterpart.
  • the adjusting piston 20 ' is connected via the connecting element 24', the z. B. a bolt receptacle 24 'may be connected to a hydraulic machine.
  • the hydraulic machine is preferably an axial piston pump or an axial piston motor, as used, for example, in construction machines.
  • the axial piston pump or the axial piston motor may be the drive of a winch, a boring head motor or the travel drive of the construction machine.
  • the construction machine is a slow-moving construction machine such as an excavator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The positioning medium has an adjustment medium, by which the movement of a setting piston (22) is terminated. The adjustment medium is adjusted from a position to another position or in reverse by a driving medium. The driving medium is a hydraulic driving medium.

Description

Die vorliegende Erfindung betrifft ein Einstellmittel für einen Stellkolben, einen Stellkolben mit wenigstens einem Einstellmittel sowie eine Hydraulikmaschine, insbesondere eine Axialkolbenpumpe oder einen Axialkolbenmotor.The present invention relates to an adjusting means for an actuating piston, an actuating piston with at least one adjusting means and a hydraulic machine, in particular an axial piston pump or an axial piston motor.

Bei Baumaschinen, insbesondere bei langsamfahrenden Baumaschinen werden Hydraulikantriebe eingesetzt. Diese Hydraulikantriebe dienen beispielsweise als Fahrantrieb, Drehwerksantrieb und/oder als Antrieb für Winden oder sonstige Werkzeuge der Baumaschine und umfassen beispielsweise eine Axialkolbenpumpe oder einen Axialkolbenmotor.In construction machines, especially in slow-moving construction machinery hydraulic drives are used. These hydraulic drives serve, for example, as travel drive, slewing gear drive and / or drive for winches or other tools of the construction machine and include, for example, an axial piston pump or an axial piston motor.

Bekannte Hydraulikantriebe weisen Einstellschrauben zur Einstellung der Betriebscharakteristik auf, wobei die Einstellschraube z. B. einen Anschlag für den minimalen Durchfluss der Axialkolbenpumpe oder des Axialkolbenmotors festlegt. Diese Einstellschraube (vgl. auch Figur 1) wird bei einem Prüfstandslauf und bei der Geräteabnahme eingestellt. Der Minimaldurchfluss (Qmin) wird hierdurch festgelegt. Danach ist jedoch keinerlei Einstellung mehr während des Betriebes möglich. Etwaige Einstellungen im Betrieb sind bislang nur aufwendig mittels elektronischer Regelungsmittel möglich. Diese Systeme neigen aber nachteiligerweise zu Schwingungen und können einen verschlechterten Wirkungsgrad aufweisen.Known hydraulic drives have adjusting screws for adjusting the operating characteristics, wherein the adjusting screw z. B. defines a stop for the minimum flow of the axial piston pump or the axial piston motor. This adjusting screw (see also FIG. 1 ) is set during a test run and when the device is taken off. The minimum flow rate (Q min ) is thereby determined. After that, however, no adjustment is possible during operation. Any adjustments in operation are so far only possible by means of electronic control means consuming. However, these systems disadvantageously tend to oscillate and may have degraded efficiency.

Es ist daher die Aufgabe der vorliegenden Erfindung, ein Einstellmittel der eingangs genannten Art in vorteilhafter Weise weiterzubilden, insbesondere dahingehend, dass dieses auch während des Betriebes verstellbar ist und/oder einen verbesserten Wirkungsgrad aufweist.It is therefore the object of the present invention to develop an adjusting means of the type mentioned in an advantageous manner, in particular to the effect that this is adjustable during operation and / or has an improved efficiency.

Diese Aufgabe wird erfindungsgemäß gelöst durch ein Einstellmittel mit den Merkmalen des Anspruchs 1. Danach ist vorgesehen, dass das Einstellmittel für einen Stellkolben derart ausgeführt ist, dass das Einstellmittel wenigstens ein Verstellmittel aufweist, mittels dessen die Bewegung des Stellkolbens begrenzbar ist und wobei das Verstellmittel von einer wenigstens ersten Position in wenigstens eine zweite Position und/oder umgekehrt mittels wenigstens eines Antriebsmittels verstellbar ist.This object is achieved by an adjusting means with the features of claim 1. Thereafter, it is provided that the adjusting means for an actuating piston is designed such that the adjusting means comprises at least one adjusting means by which the movement of the actuating piston can be limited and wherein the adjusting means of an at least first position in at least one second position and / or vice versa by means of at least one drive means is adjustable.

Durch den Einsatz insbesondere des Antriebsmittels ergibt sich der Vorteil, dass eine Einstellung mit dem Ziel einer Begrenzung der Bewegung des Stellkolbens auch während des Betriebes möglich ist. Durch diese Einstellung kann die Schwingungsneigung des Gesamtsystems vorteilhaft verringert und der Wirkungsgrad gesteigert werden, da insbesondere nunmehr eine bedarfsgerechte Einstellung des Minimaldurchflusses (Qmin) oder auch des Minimaldurchflusses (Qmax) durch den Stellkolben möglich ist.The use of the drive means in particular has the advantage that a setting with the aim of limiting the movement of the actuating piston is also possible during operation. By this setting, the tendency to oscillate of the entire system can be advantageously reduced and the efficiency can be increased, since in particular a demand-based adjustment of the minimum flow (Q min ) or the minimum flow (Q max ) is now possible by the actuator piston.

Grundsätzlich ist denkbar, dass nicht nur eine erste und eine zweite Position vorhanden sind, sondern es können auch drei oder mehrere Positionen je nach Bedarf vorgesehen sein.In principle, it is conceivable that not only a first and a second position are present, but it can also be provided three or more positions as needed.

Das Antriebsmittel kann beispielsweise ein Schrittmotor oder ein sonstiger Antrieb sein. Denkbar ist, dass der Antrieb ein hydraulischer, elektrischer und/oder mechanischer Antrieb ist.The drive means may be, for example, a stepper motor or other drive. It is conceivable that the drive is a hydraulic, electrical and / or mechanical drive.

Vorteilhafterweise ist möglich, dass das Antriebsmittel ein hydraulisches Antriebsmittel ist und/oder umfasst, mittels dessen das Verstellmittel von einer wenigstens ersten Position in wenigstens eine zweite Position und/oder umgekehrt verstellbar ist, wobei das hydraulische Antriebsmittel vorzugsweise eine Hydraulikpumpe ist oder umfasst.Advantageously, it is possible that the drive means is and / or comprises a hydraulic drive means, by means of which the adjusting means is adjustable from at least a first position to at least a second position and / or vice versa, wherein the hydraulic drive means is or comprises a hydraulic pump.

Es ist denkbar, dass das Verstellmittel ein Verstellbolzen ist und/oder umfasst, wobei vorzugsweise der Verstellbolzen in den Kolbenraum des Stellkolbens hineinragt und eine Anschlagsfläche für den Kolben des Stellkolbens ausbildet. Durch die Anschlagsfläche kann einfach und zuverlässig eine Begrenzung des Kolbenhubes bzw. der Kolbenbewegung des Stellkolbens erreicht werden.It is conceivable that the adjusting means is an adjusting bolt and / or comprises, wherein preferably the adjusting bolt projects into the piston chamber of the actuating piston and forms a stop surface for the piston of the actuating piston. By the stop surface can be easily and reliably a limitation of the piston stroke and the piston movement of the actuating piston can be achieved.

Des Weiteren ist möglich, dass das Verstellmittel hydraulisch mittelbar und/oder unmittelbar verrastbar und/oder aus einer Verrastung lösbar ist, wobei vorzugsweise das Verstellmittel in der ersten und/oder zweiten Position hydraulisch mittels eines Verrastungsmittels verrastbar ist. Denkbar ist beispielsweise, dass durch Anlegen eines Verrastungsdrucks eine Verrastung herbeigeführt wird.Furthermore, it is possible that the adjusting means hydraulically indirectly and / or directly latched and / or is releasable from a latch, wherein preferably the adjusting means in the first and / or second position is hydraulically latched by means of a Verrastungsmittels. It is conceivable, for example, that a locking is brought about by applying a latching pressure.

Alternativ kann vorgesehen sein, dass durch Anlegen des Verrastungsdrucks bzw. Entrastungsdrucks das Verrastungsmittels aus der Verrastung gelöst wird, also die Verrastung drucklos etwa durch Federkraft gesichert ist.Alternatively, it can be provided that the Verrastungsmittels is released from the latching by applying the Verrastungsdrucks or Entrastungsdrucks, so the latching is secured without pressure, for example by spring force.

Darüber hinaus kann vorgesehen sein, dass das Verrastungsmittel wenigstens einen hydraulisch aktivierbaren, vorzugsweise federbelasteten, Verrastungsbolzen aufweist und wobei der Verrastungsbolzen in der wenigstens einen ersten und wenigstens einen zweiten Position jeweils in einer Verrastungsposition verrastbar ist.In addition, it can be provided that the latching means has at least one hydraulically activatable, preferably spring-loaded, latching bolt and wherein the latching bolt in the at least one first and at least one second position can be latched in each case in a Verrastungsposition.

Denkbar ist insbesondere, dass mehrere, insbesondere zwei Verrastungsbolzen vorgesehen sind. Es kann vorgesehen sein, dass der oder die Verrastungsbolzen in Ausnehmungen im Verstellmittel angeordnet und geführt sind. Durch ein Ausfahren der Verrastungsbolzen kann hierdurch eine einfache und sichere Verrastung herbeigeführt werden.It is conceivable, in particular, that several, in particular two Verrastungsbolzen are provided. It can be provided that the one or more Verrastungsbolzen are arranged and guided in recesses in the adjustment. By extending The locking bolt can thereby be brought about a simple and secure locking.

Des Weiteren kann vorteilhaft vorgesehen sein, dass das Verrastungsmittel derart selbstjustierend ausgeführt ist, dass es sich in der angefahrenen Verrastungsposition selbsttätig einrastet. Hierzu kann beispielsweise die Verrastungsposition derart abgerundet ausgebildet sein, dass der als Gegenstück ausgebildete Verrastungsbolzen aufgrund der Formgebung selbstjustierend in der Verrastungsposition einrastet.Furthermore, it may be advantageously provided that the latching means is designed so self-adjusting that it automatically engages in the approached Verrastungsposition. For this purpose, for example, the Verrastungsposition be formed rounded so that the locking pin designed as a counterpart snaps self-adjusting due to the shape in the Verrastungsposition.

Es ist weiter möglich, dass das Einstellmittel wenigstens ein erstes hydraulisches Pumpmittel aufweist, mittels dessen das Verstellmittel verstellbar ist, und wenigstens ein zweites hydraulisches Pumpmittel aufweist, mittels dessen das Verrastungsmittels lösbar und/oder verrastbar ist.It is further possible that the adjusting means comprises at least a first hydraulic pumping means by means of which the adjusting means is adjustable, and at least a second hydraulic pumping means, by means of which the latching means is releasable and / or latched.

Außerdem kann vorgesehen sein, dass der Stellkolben der Stellkolben einer Hydraulikmaschine ist und dass mittels des Einstellmittels ein minimaler und/oder maximaler Volumenstrom in der Hydraulikmaschine einstellbar ist. Die Einstellung erfolgt vorzugsweise durch eine Begrenzung oder Erweiterung des Kolbenhubes, so dass eine einfache Einstellung des Minimaldurchflusses (Qmin) oder auch des Minimaldurchflusses (Qmax) möglich ist.In addition, it can be provided that the adjusting piston of the adjusting piston of a hydraulic machine and that by means of the adjusting means a minimum and / or maximum volume flow in the hydraulic machine is adjustable. The setting is preferably carried out by limiting or expanding the piston stroke, so that a simple adjustment of the minimum flow (Q min ) or the minimum flow (Q max ) is possible.

Des Weiteren betrifft die vorliegende Erfindung einen Stellkolben mit den Merkmalen des Anspruchs 9. Danach ist vorgesehen, dass ein Stellkolben, insbesondere ein Stellkolben einer Hydraulikmaschine wie einer Axialkolbenpumpe oder einem Axialkolbenmotor, mit wenigstens einem Einstellmittel nach einem der Ansprüche 1 bis 8 versehen ist.Furthermore, the present invention relates to a control piston with the features of claim 9. Thereafter, it is provided that an actuating piston, in particular an actuating piston of a hydraulic machine such as an axial piston pump or an axial piston motor, is provided with at least one adjusting means according to one of claims 1 to 8.

Darüber hinaus betrifft die vorliegende Erfindung eine Hydraulikmaschine mit den Merkmalen des Anspruchs 10. Danach ist vorgesehen, dass eine Hydraulikmaschine mit wenigstens einem Stellmittel nach einem der Ansprüche 1 bis 8 und/oder einem Stellkolben nach Anspruch 9 versehen ist.In addition, the present invention relates to a hydraulic machine with the features of claim 10. Thereafter, it is provided that a hydraulic machine is provided with at least one actuating means according to one of claims 1 to 8 and / or an actuating piston according to claim 9.

Bei der Hydraulikmaschine handelt es sich vorzugsweise um eine Axialkolbenpumpe oder einen Axialkolbenmotor, wie sie beispielsweise bei Baumaschinen eingesetzt werden.The hydraulic machine is preferably an axial piston pump or an axial piston motor, as used, for example, in construction machines.

Es kann sich beispielsweise bei der Axialkolbenpumpe oder dem Axialkolbenmotor um den Antrieb einer Winde oder um den Fahrantrieb einer Baumaschine handeln. Auch bei einem Doppelmotor umfassend Axialkolbenpumpen auf einem Bohrkopf ist es insbesondere von Vorteil, wenn durch eine bedarfsgerechte Einstellung des Minimaldurchflusses (Qmin) durch den Stellkolben hierdurch die Drehzahl des Motors im Betrieb reduziert werden kann.For example, the axial piston pump or the axial piston motor may be the drive of a winch or the travel drive of a construction machine. Even with a double motor comprising axial piston pumps on a drill head, it is particularly advantageous if the rotational speed of the motor during operation can be reduced by setting the minimum flow rate (Q min ) as required by the actuating piston.

Bei der Baumaschine handelt es sich beispielsweise um eine langsam fahrende Baumaschine wie einen Bagger. Gerade bei einem Fahrmotor eines Mobilbaggers ist es von Vorteil, wenn durch eine bedarfsgerechte Einstellung des Minimaldurchflusses (Qmin) durch den Stellkolben des als Fahrmotors dienenden Axialkolbenmotors hierdurch die Drehzahl des Motors im Betrieb reduziert werden kann.For example, the construction machine is a slow-moving construction machine such as an excavator. Especially with a drive motor of a wheeled excavator, it is advantageous if the rotational speed of the motor during operation can be reduced by a demand-oriented adjustment of the minimum flow (Q min ) through the actuating piston of the axial piston motor serving as drive motor.

Weitere Einzelheiten und Vorteile der Erfindung sollen nun anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert werden.Further details and advantages of the invention will now be explained in more detail with reference to an embodiment shown in the drawing.

Es zeigen:

Figur 1:
eine Schnittdarstellung eines bekannten Stellkolbens für eine Axialkolbenpumpe; und
Figur 2:
eine Detailschnittdarstellung eines Stellkolbens mit einem erfindungsgemäßen Einstellmittel.
Show it:
FIG. 1:
a sectional view of a known actuator piston for an axial piston pump; and
FIG. 2:
a detail sectional view of a control piston with an adjustment according to the invention.

Figur 1 zeigt eine Schnittdarstellung eines bekannten Stellzylinders 20 für eine Axialkolbenpumpe 10 einer nicht näher dargestellten Baumaschine. Mit Hilfe des Stellzylinders 20 bzw. des Stellkolbens 22 kann das benötigte Fördervolumen bzw. FIG. 1 shows a sectional view of a known actuating cylinder 20 for an axial piston pump 10 of a construction machine, not shown. With the help of the adjusting cylinder 20 and the adjusting piston 22, the required delivery volume or

Schluckvolumen über die Verstellung des Schwenkjoches oder der Schwenkwiege eingestellt werden.Suction volume can be adjusted via the adjustment of the swivel yoke or the swivel cradle.

Der Stellkolben 22 des Stellzylinders 20 weist eine Stellschraube 30 auf, die den Anschlag 32 für den minimalen Durchfluss der Axialkolbenpumpe festlegt. Denn der Stellkolben 20 ist in seinem Hub durch den Anschlag 32 begrenzt.The actuating piston 22 of the actuating cylinder 20 has an adjusting screw 30 which defines the stop 32 for the minimum flow of the axial piston pump. Because the actuator piston 20 is limited in its stroke by the stop 32.

Diese Einstellschraube 30 wird bei einem Prüfstandslauf und bei der Geräteabnahme eingestellt. Der Minimaldurchfluss (Qmin) wird hierdurch festgelegt. Die Einstellschraube 30 wird daher auch als Qmin-Anschlag bezeichnet. Nach der Einstellung des Anschlages 32 und insbesondere während des Betriebes ist jedoch keinerlei Einstellung mehr möglich.This adjustment screw 30 is adjusted during a test run and when the device is removed. The minimum flow rate (Q min ) is thereby determined. The adjusting screw 30 is therefore also referred to as Q min stop. After the adjustment of the stop 32 and in particular during operation, however, no adjustment is possible.

Wie in Figur 2 gezeigt, ist erfindungsgemäß vorgesehen, an Stelle der Einstellschraube 30 am Stellzylinder 20' ein hydraulisch verstellbares Einstellmittel 100 vorzusehen.As in FIG. 2 is shown, according to the invention provided to provide a hydraulically adjustable adjusting means 100 instead of the adjusting screw 30 on the adjusting cylinder 20 '.

Das hydraulisch verstellbare Einstellmittel umfasst einen kleinen Verstellkolben 110, dessen Position durch eine erste Pumpe 120 verstellt werden kann. Der Verstellkolben 110 ragt mit seinem einen Ende in den Stellzylinder 20' hinein und definiert hierdurch einen Anschlag 32' für den Stellkolben 22'.The hydraulically adjustable adjusting means comprises a small adjusting piston 110, the position of which can be adjusted by a first pump 120. The adjusting piston 110 protrudes with its one end into the actuating cylinder 20 'and thereby defines a stop 32' for the actuating piston 22 '.

Der Verstellkolben 110 kann in drei Positionen 132, 134, 136 verstellt werden, die jeweils einem vordefinierten Qmin-Wert entsprechen. Genausogut ist es auch möglich, dass jede Position einem vordefinierten Qmax-Wert entspricht.The adjusting piston 110 can be adjusted in three positions 132, 134, 136, each corresponding to a predefined Q min value. It is equally possible that each position corresponds to a predefined Q max value.

Jeder Position 132, 134 und 136 ist einer Rastposition 142, 144, 146 bzw. Rastausnehmung 142, 144, 146 zugeordnet, in die die beiden Rastbolzen 130 eingreifen können. Die Rastpositionen 142, 144, 146 sind im Zylindergehäuse 25 des Stellzylinders 20' angeordnet, wobei das Zylindergehäuse 25' auch Gehäuse des Verstellkolbens 110 ist. Durch Anlegen eines Verrastungsdrucks mittels einer zweiten Pumpe 150 können die beiden Rastbolzen 130 in der gewünschten Rastposition 142, 144, 146, gemäß Figur 2 in der Rastposition 144, verrastet werden.Each position 132, 134 and 136 is assigned to a latching position 142, 144, 146 or latching recess 142, 144, 146, into which the two latching bolts 130 can engage. The latching positions 142, 144, 146 are arranged in the cylinder housing 25 of the actuating cylinder 20 ', wherein the cylinder housing 25' is also the housing of the adjusting piston 110. By applying a Verrastungsdrucks by means of a second Pump 150, the two locking pins 130 in the desired locking position 142, 144, 146, according to FIG. 2 in the locking position 144, to be locked.

Die beiden Rastbolzen 130 sind in Ausnehmungen 139 in dem Verstellkolben 110 aufgenommen. Die Rastbolzen 130 sind dabei senkrecht und radial zur Axialrichtung des Verstellkolbens 110 angeordnet.The two locking pins 130 are received in recesses 139 in the adjusting piston 110. The locking pins 130 are arranged perpendicularly and radially to the axial direction of the adjusting piston 110.

Im drucklosen Zustand werden die Rastbolzen 130 durch die Federn 138, die durch das Anlegen des Verrastungsdruckes gespannt werden, gelöst. Grundsätzlich kann auch vorgesehen sein, dass die Federn 138 derart angeordnet werden, dass diese im drucklosen Zustand die Rastbolzen 130 verrasten und dass durch das Anlegen eines Druckes mittels der Pumpe 150 die Rastbolzen 130 gelöst werden.In the unpressurized state, the locking bolts 130 are released by the springs 138, which are tensioned by the application of the latching pressure. In principle, it can also be provided that the springs 138 are arranged in such a way that they latch the latching bolts 130 in the unpressurized state and that the latching bolts 130 are released by the application of a pressure by means of the pump 150.

Die Rastpositionen 142, 144 und 146 sind dabei derart geformt, dass der Rastbolzen 130 selbstjustierend in die angefahrene Rastposition 142, 144, 146 einrastet. Dies wird vorliegend dadurch erreicht, dass die Rastbolzen 130 abgerundet sind und das abgerundete Ende in die als Gegenstück ausgebildete Rastposition 142, 144, 146 einrastet.The detent positions 142, 144 and 146 are shaped such that the locking pin 130 self-aligning in the approached detent position 142, 144, 146 engages. In the present case, this is achieved in that the locking bolts 130 are rounded and the rounded end engages in the locking position 142, 144, 146 formed as a counterpart.

Der Stellkolben 20' ist über das Anschlusselement 24', das z. B. eine Bolzenaufnahme 24' sein kann, an eine Hydraulikmaschine angeschlossen. Bei der Hydraulikmaschine handelt es sich vorzugsweise um eine Axialkolbenpumpe oder einen Axialkolbenmotor, wie sie beispielsweise bei Baumaschinen eingesetzt werden. Es kann sich beispielsweise bei der Axialkolbenpumpe oder dem Axialkolbenmotor um den Antrieb einer Winde, einen Bohrkopfmotor oder um den Fahrantrieb der Baumaschine handeln. Bei der Baumaschine handelt es sich beispielsweise um eine langsam fahrende Baumaschine wie einen Bagger.The adjusting piston 20 'is connected via the connecting element 24', the z. B. a bolt receptacle 24 'may be connected to a hydraulic machine. The hydraulic machine is preferably an axial piston pump or an axial piston motor, as used, for example, in construction machines. For example, the axial piston pump or the axial piston motor may be the drive of a winch, a boring head motor or the travel drive of the construction machine. For example, the construction machine is a slow-moving construction machine such as an excavator.

Claims (10)

Einstellmittel für einen Stellkolben, wobei das Einstellmittel wenigstens ein Verstellmittel aufweist, mittels dessen die Bewegung des Stellkolbens begrenzbar ist und wobei das Verstellmittel von einer wenigstens ersten Position in wenigstens eine zweite Position und/oder umgekehrt mittels wenigstens eines Antriebsmittels verstellbar ist.Adjusting means for an actuating piston, wherein the adjusting means comprises at least one adjusting means by which the movement of the adjusting piston is limited and wherein the adjusting means of at least a first position in at least a second position and / or vice versa by means of at least one drive means is adjustable. Einstellmittel nach Anspruch 1, dadurch gekennzeichnet, dass das Antriebsmittel ein hydraulisches Antriebsmittel ist und/oder umfasst, mittels dessen das Verstellmittel von einer wenigstens ersten Position in wenigstens eine zweite Position und/oder umgekehrt verstellbar ist, wobei das hydraulische Antriebsmittel vorzugsweise eine Hydraulikpumpe ist oder umfasst.Adjusting means according to claim 1, characterized in that the drive means is a hydraulic drive means and / or comprises, by means of which the adjusting means is adjustable from at least a first position to at least a second position and / or vice versa, wherein the hydraulic drive means is preferably a hydraulic pump or includes. Einstellmittel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Verstellmittel ein Verstellbolzen ist und/oder einen Verstellbolzen umfasst, wobei vorzugsweise der Verstellbolzen in den Kolbenraum des Stellkolbens hineinragt und eine Anschlagsfläche für den Kolben des Stellkolbens ausbildet.Adjusting means according to one of the preceding claims, characterized in that the adjusting means is an adjusting bolt and / or an adjusting bolt comprises, wherein preferably the adjusting bolt protrudes into the piston chamber of the actuating piston and forms a stop surface for the piston of the actuating piston. Einstellmittel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Verstellmittel hydraulisch mittelbar und/oder unmittelbar verrastbar und/oder aus einer Verrastung lösbar ist, wobei vorzugsweise das Verstellmittel in der ersten und/oder zweiten Position hydraulisch mittels eines Verrastungsmittels verrastbar ist.Adjusting means according to one of the preceding claims, characterized in that the adjusting means hydraulically indirectly and / or directly latched and / or releasable from a latch, wherein preferably the adjusting means in the first and / or second position is hydraulically latched by means of a Verrastungsmittels. Einstellmittel nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass das Verrastungsmittel wenigstens einen hydraulisch aktivierbaren, vorzugsweise federbelasteten, Verrastungsbolzen aufweist und wobei der Verrastungsbolzen in der wenigstens einen ersten und wenigstens einen zweiten Position jeweils in einer Verrastungsposition verrastbar ist.Adjusting means according to claim 3 or 4, characterized in that the latching means has at least one hydraulically activatable, preferably spring-loaded, latching bolt and wherein the latching bolt in the at least one first and at least one second position can be latched in each case in a Verrastungsposition. Einstellmittel nach Anspruch 5, dadurch gekennzeichnet, dass das Verrastungsmittel derart selbstjustierend ausgeführt ist, dass es sich in der angefahrenen Verrastungsposition selbsttätig einrastet.Adjusting means according to claim 5, characterized in that the latching means is designed so self-adjusting that it automatically engages in the approached Verrastungsposition. Einstellmittel nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass das Einstellmittel wenigstens ein erstes hydraulisches Pumpmittel aufweist, mittels dessen das Verstellmittel verstellbar ist, und wenigstens ein zweites hydraulisches Pumpmittel aufweist, mittels dessen das Verrastungsmittels lösbar und/oder verrastbar ist.Adjusting means according to one of claims 3 to 6, characterized in that the adjusting means comprises at least a first hydraulic pumping means, by means of which the adjusting means is adjustable, and at least a second hydraulic pumping means, by means of which the latching means is releasable and / or latched. Einstellmittel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Stellkolben der Stellkolben einer Hydraulikmaschine ist und dass mittels des Einstellmittels ein minimaler und/oder maximaler Volumenstrom in der Hydraulikmaschine einstellbar ist.Adjusting means according to one of the preceding claims, characterized in that the adjusting piston of the adjusting piston of a hydraulic machine and that by means of the adjusting means a minimum and / or maximum flow in the hydraulic machine is adjustable. Stellkolben, insbesondere Stellkolben einer Hydraulikmaschine wie einer Axialkolbenpumpe oder einem Axialkolbenmotor, mit wenigstens einem Einstellmittel nach einem der vorhergehenden Ansprüche.Control piston, in particular actuating piston of a hydraulic machine such as an axial piston pump or an axial piston motor, with at least one adjusting means according to one of the preceding claims. Hydraulikmaschine, insbesondere Axialkolbenpumpe oder Axialkolbenmotor, mit wenigstens einem Stellmittel nach einem der Ansprüche 1 bis 8 und/oder einem Stellkolben nach Anspruch 9.Hydraulic machine, in particular axial piston pump or axial piston motor, with at least one actuating means according to one of claims 1 to 8 and / or an actuating piston according to claim 9.
EP20110001065 2010-07-22 2011-02-09 Adjustment agent for a set piston, set piston and hydraulic machine Not-in-force EP2410179B1 (en)

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CH12052010A CH703535B1 (en) 2010-07-22 2010-07-22 Adjusting for an actuating cylinder, actuating cylinders and hydraulic machine.

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DE102020206599A1 (en) 2019-06-26 2020-12-31 Robert Bosch Gesellschaft mit beschränkter Haftung Adjusting cylinder for a hydrostatic axial piston machine and hydrostatic axial piston machine with an adjusting cylinder

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE1001994B (en) * 1955-10-18 1957-02-07 Aschaffenburger Zellstoffwerke Process for the recovery, separation and purification of organic carbonyl-free aromatic and aromatic heterocyclic nitrogen-containing bases with the aid of the crystallized poorly soluble molecular compounds from 2,4-dinitrophenylhydrazine and the bases concerned
EP0554537A1 (en) * 1992-01-30 1993-08-11 Brueninghaus Hydromatik Gmbh Machine with axial pistons, particularly hydraulic pump of swash plate or inclined axis type, with an output adjusting device
DE10100108A1 (en) * 2001-01-03 2002-07-04 Linde Ag Hydrostatic cylinder displacement unit for vehicle braking systems has adjustable minimum displacement volume to alter braking torque
US20060140781A1 (en) * 2003-01-29 2006-06-29 Koganel Corporation Hydraulic cylinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001994B (en) * 1955-10-18 1957-02-07 Aschaffenburger Zellstoffwerke Process for the recovery, separation and purification of organic carbonyl-free aromatic and aromatic heterocyclic nitrogen-containing bases with the aid of the crystallized poorly soluble molecular compounds from 2,4-dinitrophenylhydrazine and the bases concerned
EP0554537A1 (en) * 1992-01-30 1993-08-11 Brueninghaus Hydromatik Gmbh Machine with axial pistons, particularly hydraulic pump of swash plate or inclined axis type, with an output adjusting device
DE10100108A1 (en) * 2001-01-03 2002-07-04 Linde Ag Hydrostatic cylinder displacement unit for vehicle braking systems has adjustable minimum displacement volume to alter braking torque
US20060140781A1 (en) * 2003-01-29 2006-06-29 Koganel Corporation Hydraulic cylinder

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CH703535B1 (en) 2012-09-14
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