EP0941403B1 - Axial piston motor with bearing flushing - Google Patents

Axial piston motor with bearing flushing Download PDF

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Publication number
EP0941403B1
EP0941403B1 EP97948792A EP97948792A EP0941403B1 EP 0941403 B1 EP0941403 B1 EP 0941403B1 EP 97948792 A EP97948792 A EP 97948792A EP 97948792 A EP97948792 A EP 97948792A EP 0941403 B1 EP0941403 B1 EP 0941403B1
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EP
European Patent Office
Prior art keywords
axial piston
positioning
bore
piston machine
mirror body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97948792A
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German (de)
French (fr)
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EP0941403A1 (en
Inventor
Juan Moya
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.)
Brueninghaus Hydromatik GmbH
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Brueninghaus Hydromatik GmbH
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Publication of EP0941403A1 publication Critical patent/EP0941403A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • 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
    • 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
    • F04B1/328—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 axis of the cylinder barrel relative to the swash plate

Definitions

  • the invention relates to an axial piston machine in a swivel slide design with a internal flushing.
  • the invention relates to an axial piston machine according to the preamble of Claim 1 as e.g. is known from DE 42 15 869 C1 or EP-A-728945.
  • This publication discloses an axial piston machine in a swivel slide design.
  • the well-known Axial piston machine comprises a pivotable cylinder drum, and one in one Drive shaft bearing mounted drive shaft.
  • the drive shaft is with one Drive shaft flange connected, in which in cylinder bores of the cylinder drum movable pistons are articulated and on which the cylinder drum over a Center pin supports.
  • Furthermore, is between the cylinder drum and an end face End plate provided a lenticular control mirror body, the control kidneys for cyclical connection of the cylinder bores with the working lines.
  • the invention is therefore based on the object for an axial piston machine in To provide a suitable flushing agent supply.
  • the object is in connection with the characterizing features of claim 1 solved with the generic features.
  • the invention is based on the finding that the detergent channel for Flushing agent supply for the drive shaft bearing and, if necessary, additional for flushing the housing in a simple manner through the adjusting pin and the control mirror body to the Center pin can be guided.
  • the flushing and feed pressure valve can then be outside of the control mirror body may be arranged, which is the construction of the control mirror body significantly simplified, so that the mechanical strength of the control mirror body by the measures required for the formation of the flushing channel are not weakened.
  • an externally provided flushing and feed pressure valve from is adjustable on the outside and the amount of detergent introduced into the detergent channel to the actual needs can be easily adjusted.
  • the central bore of the control mirror body for receiving the adjusting pin can according to claim 2 at the same time be part of the detergent channel, so that on the Control mirror body to form the detergent channel no constructive Changes are necessary.
  • the only necessary modification of the adjusting pin for the detergent channel is the formation of this hole.
  • the Bore can be formed with such a small diameter that the mechanical strength of the adjusting pin is insignificant due to this measure, especially weakened by less than 1%.
  • the actuating device can be operated hydraulically Have adjusting piston in which a transverse bore is formed around the adjusting pin to record.
  • the actuating piston can according to claim 5 in one End plate trained longitudinal bore to be provided, which are provided with a longitudinal groove is, in which the bore of the adjusting pin either directly or indirectly via the Cross bore of the control piston opens.
  • the longitudinal groove ensures one Detergent supply in every position of the control piston and the one used in it Adjusting pin. Regardless of the pivoting position of the cylinder drum, the Control mirror body and the adjusting pin inserted in the adjusting piston is one Connection of the hole of the adjusting pin with that provided in the end plate Longitudinal groove ensured.
  • the longitudinal groove can according to claim 6 with a Supply line for the detergent be connected.
  • the flushing and feed pressure valve for Introducing the detergent into the detergent channel can be at the mouth of the Supply line must be mounted externally on the end plate.
  • the flushing and feed pressure valve is particularly accessible and adjustable from the outside.
  • the detergent channel according to the invention can be next to one Flushing agent supply for the drive shaft bearing and also a housing flush serve. This results in a particularly favorable heat balance Axial piston machine, because the detergent dissipates the heat loss of the axial piston machine is carried away.
  • Fig. 1 shows an embodiment of an axial piston machine according to the invention in Swivel carriage design in an axial longitudinal section.
  • a housing 2 of the axial piston machine 1 there is a drive shaft 3 via two roller bearings 4 and 5 rotatably mounted.
  • a drive shaft flange 6 On the drive shaft 3 is a drive shaft flange 6 in Embodiment molded in one piece.
  • Cylinder drum 8 In the housing interior 7 is one Cylinder drum 8 can be pivoted about a pivot axis perpendicular to the plane of the drawing arranged.
  • In the cylinder drum 8 are several on a pitch circle with the same Spaced cylinder bores 9, 10 are provided.
  • pistons 11, 12 are slidably guided outside the cylinder drum 8
  • Ball heads 13, 14 are formed.
  • the ball heads 13, 14 of the pistons 11, 12 are in spherical bearings 15 of the drive shaft flange 6 articulated.
  • the cylinder drum 8 is on the drive shaft flange 6 via a central pin 16 rotatably and pivotably mounted. Between an end plate 17 and the Cylinder drum 8 is on the side facing away from the drive shaft flange 6 Cylinder drum 8 a lens-shaped in the embodiment Control mirror body 18 arranged.
  • the cylinder drum 8 is in a Center pin 16 provided spring 19 against the control mirror body 18 or the End plate 17 biased.
  • the central pin 16 also has a ball head 20 on, which is rotatable in a further spherical bearing 21 of the drive shaft flange 6 and is pivotally mounted.
  • Cylinder drum 8 serves the control mirror body 18 as a swivel slide.
  • One opposite the partially cylindrical or spherical boundary surface 22 of the cylinder drum 8 of the control mirror body 18 slides when adjusting the cylinder drum 8 on one correspondingly shaped sliding surface 23 along the end plate 17.
  • the control mirror body 18 has a central bore 24, into which an adjusting pin 25 is used so that the adjusting pin 25 to compensate for the pivoting movement of the Control mirror body 18 pivotable and axially displaceable in its central bore 24 is.
  • an actuator in a longitudinal bore 27 of the end plate 17 displaceable adjusting piston 28 comprises.
  • the Adjusting pin 25 is inserted into a transverse bore 29 of the adjusting piston 28.
  • the actuating piston 28 is connected to a control pressure line connected to a connection 30 with a Actuating pressure can be applied so that the actuating piston 28 against a return spring 31st is movable.
  • the axial piston machine 1 is in the direction of smaller Displacement swung back.
  • the axial piston machine 1 is provided with a detergent channel Provide detergent supply for the drive shaft bearings 4, 5.
  • the detergent channel includes a supply line 40 provided in the end plate 17, on which a flushing and Feed pressure valve 41 is connected.
  • the purge and feed pressure valve 41 is on externally the end plate 17 arranged and for adjusting the detergent pressure and The amount of detergent is therefore easily accessible from the outside.
  • the feed line 40 opens into a Longitudinal groove 42 which is provided peripherally on the longitudinal bore 27.
  • a bore 43 is provided which on the control mirror body 18th remote side either opens directly into the longitudinal groove 42 or, as in in Fig. 1 illustrated embodiment, indirectly via the transverse bore 29 in the Longitudinal groove 42 opens out.
  • the length of the longitudinal groove 42 is such that in each Pivot position of the cylinder drum 8 a connection between the bore 43 of the Adjusting pin 25 and the longitudinal groove 42 is ensured.
  • FIG. 2 For better clarification of the detergent channel guide in this area, in FIG. 2 a section along the line A-A is shown. A cross section of the is shown End plate 17 and in the end plate 17 for guiding the actuating piston 28 provided longitudinal bore 27.
  • the adjusting pin 25 has an axial bore 43 which is part of the detergent channel according to the invention.
  • the feed line 40 is, as also from the 2, with the longitudinal groove 42 provided peripherally on the longitudinal bore 27 connected.
  • the bore 43 of the adjusting pin 25 opens out indirectly via that in the area 44 through the adjusting pin 25 not filled transverse bore 29 of the actuating piston 28 in the Longitudinal groove 42 out.
  • the bore 43 of the adjusting pin 25 in the longitudinal groove 42 opens out immediately when the adjusting pin 25 has the transverse bore 29 completely filled out.
  • the mechanical strength is provided by the bore 43 provided in the adjusting pin 25 of the adjusting pin 25 only slightly affected.
  • the diameter of the bore 43 can be dimensioned so small that there is a reduction in mechanical Strength of less than 1% results.
  • the mechanical strength of the Control mirror body 18 is not influenced by the measures according to the invention, since the solution according to the invention does not change the design of the control mirror body 18 makes necessary.
  • the detergent channel continues through the Central bore 24 of the control mirror body 18. It should be emphasized that the anyway existing central bore 24 of the control mirror body 18 without further modification also takes on the task of supplying the detergent.
  • the detergent channel runs further through an axial bore 44 in the cylinder drum 8 and a bore 45 in the spring plate 46 to open into the spring space 47 of the center pin 16.
  • Center pin 16 then runs a central bore 48 from the spring chamber 47 up to the spherical bearing 21.
  • In the drive shaft 3 there are further connecting channels 49, 50 and 51 are provided, which open out directly in the area of the roller bearings 4, 5.
  • On the spherical bearing 21 are both the central bore 48 of the central pin 16 and also the junction of the connecting channel 49 with trumpet-shaped extensions provided to ensure that in each pivoting position of the cylinder drum 8 Detergent flow is made possible.
  • the detergent After flowing through the drive shaft bearing 4, 5, the detergent flows into the Housing interior 7 to this as leakage fluid through the housing opening 52 leave. This also ensures that the housing is flushed, which, among other things, the Heat dissipation is used for waste heat. In this way, the heat balance of the Axial piston machine 1 improved.
  • the invention is not limited to the illustrated embodiment.
  • the detergent flow to the adjusting pin 25 could also be in other ways, e.g. on the Adjusting piston 28 take place.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detergent Compositions (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)

Description

Die Erfindung betrifft eine Axialkolbenmaschine in Schwenkschlittenbauweise mit einer internen Lagerspülung.The invention relates to an axial piston machine in a swivel slide design with a internal flushing.

Die Erfindung geht aus von einer Axialkolbenmaschine nach dem Oberbegriff des Anspruchs 1, wie sie z.B. aus der DE 42 15 869 C1 oder EP-A-728945 bekannt ist. Diese Druckschrift offenbart eine Axialkolbenmaschine in Schwenkschlittenbauweise. Die bekannte Axialkolbenmaschine umfaßt eine schwenkbare Zylindertrommel, und eine in einer Triebwellenlagerung gelagerte Triebwelle. Die Triebwelle ist mit einem Triebwellenflansch verbunden, in welchem in Zylinderbohrungen der Zylindertrommel bewegliche Kolben angelenkt sind und an welchem sich die Zylindertrommel über einen Mittelzapfen abstützt. Ferner ist zwischen der Zylindertrommel und einer stirnseitigen Abschlußplatte ein linsenförmiger Steuerspiegelkörper vorgesehen, der Steuernieren zur zyklischen Verbindung der Zylinderbohrungen mit den Arbeitsleitungen aufweist. Zum Verschwenken der Zylindertrommel mitsamt dem Steuerspiegelkörper ist eine bei der DE 42 15 869 C1 im einzelnen nicht dargestellte Stelleinrichtung vorgesehen. Um die Triebwellenlagerung mit Spülmittel zu versorgen, ist in dem Mittelzapfen und in der Triebwelle ein Spülkanal vorgesehen. Das aufgrund der Lagerspülung aus der Triebwellenlagerung ablaufende Lecköl wird durch ein an dem Triebwellenflansch vorgesehenes Schaufelrad in Richtung auf eine Gehäuseöffnung abgefördert.The invention relates to an axial piston machine according to the preamble of Claim 1 as e.g. is known from DE 42 15 869 C1 or EP-A-728945. This publication discloses an axial piston machine in a swivel slide design. The well-known Axial piston machine comprises a pivotable cylinder drum, and one in one Drive shaft bearing mounted drive shaft. The drive shaft is with one Drive shaft flange connected, in which in cylinder bores of the cylinder drum movable pistons are articulated and on which the cylinder drum over a Center pin supports. Furthermore, is between the cylinder drum and an end face End plate provided a lenticular control mirror body, the control kidneys for cyclical connection of the cylinder bores with the working lines. To the Swiveling the cylinder drum together with the control mirror body is one of the DE 42 15 869 C1 provided in the actuator, not shown in detail. To the To supply the drive shaft bearing with detergent is in the center pin and in the Drive shaft provided a flushing channel. That because of the bearing flushing from the Leakage oil running off the drive shaft bearing is replaced by a on the drive shaft flange provided blade wheel in the direction of a housing opening.

Aus der DE 36 38 890 C2 ist es bekannt, eine Axialkolbenmaschine in Schiefachsenbauweise mit konstantem, nicht verstellbarem Verdrängungsvolumen mit einem Spülmittelkanal zu versehen, welcher sich durch den Mittelzapfen und die Triebwelle erstreckt. Das Spülmittel wird mittels einer druckabhängig verschiebbaren Ventilnadel aus der Niederdruck führenden Steuerniere des Steuerteils entnommen.From DE 36 38 890 C2 it is known to use an axial piston machine in Skew axis construction with constant, non-adjustable displacement volume with to provide a detergent channel, which is through the center pin and the Drive shaft extends. The detergent is displaceable by means of a pressure-dependent Valve needle is removed from the control part of the control section, which carries low pressure.

Diese konstruktive Lösung läßt sich jedoch nicht bei Axialkolbenmaschinen in Schwenkschlittenbauweise mit zur Veränderung des Verdrängungsvolumens verschwenkbarer Zylindertrommel einsetzen, ohne daß sich in der Praxis nicht zu überwindende Probleme ergeben. Insbesondere hat sich gezeigt, daß es zu Funktionsstörungen der Ventilnadel kommt, wenn der Steuerspiegelkörper auch die Anschlagmittel aufschlägt, die jeweils das minimale und maximale Verdrängungsvolumen festlegen. Durch dabei auftretende Stoßbelastungen verklemmt sich die Ventilnadel und es kann zu Rissen in dem Steuerspiegelkörper kommen. Desweiteren hat sich die aus der DE 36 38 890 C2 bekannte Lösung mit integrierter Ventilnadel auch deshalb nicht bewährt, weil die für die Aufnahme der Spülnadel notwendigen Bohrungen und Ausnehmungen zu einer Abschwächung des Steuerspiegelkörpers führen und die Speisedruckabsicherung für das Spülmittel wegen der Rotation und der Schwenkbewegung der Zylindertrommel und des Steuerspiegelkörpers nicht konstant ist. Ferner ist nachteilig, daß die Speisedruckeinstellung für das Spülmittel nicht von außen eingestellt werden kann, da das Speisedruckventil nicht von außen zugänglich ist, und das in dem Steuerspiegelkörper integrierte Spülventil nenngrößenabhängig ist, da der Abstand der Steuernieren für jede Nenngröße der Axialkolbenmaschinen verschieden ist. Auch hat sich gezeigt, daß die von dem in dem Steuerspiegelkörper integrierten Spülventil in den Spülkanal eingeleitete Spülmittelmenge für manche Anwendungen nicht ausreichend ist.However, this constructive solution cannot be found in axial piston machines Swivel carriage design with for changing the displacement volume use the swiveling cylinder drum, without it not moving in practice overcoming problems. In particular, it has been shown that it is too Malfunction of the valve needle comes when the control mirror body also Lifting gear opens, each of the minimum and maximum displacement establish. The resulting valve loads cause the valve needle to jam can cause cracks in the control mirror body. Furthermore, the DE 36 38 890 C2 well-known solution with integrated valve needle also not proven, because the bores and recesses necessary for receiving the flushing needle a weakening of the control mirror body and the feed pressure protection for the detergent due to the rotation and pivoting movement of the cylinder drum and of the control mirror body is not constant. Another disadvantage is that the The feed pressure setting for the detergent cannot be adjusted from the outside as this Feed pressure valve is not accessible from the outside, and that in the control mirror body integrated flush valve is dependent on the nominal size, since the distance between the control kidneys for each Nominal size of the axial piston machines is different. It has also been shown that the the flush valve integrated in the control mirror body introduced into the flush channel The amount of detergent is not sufficient for some applications.

Aus den vorstehend genannten Gründen hat sich die aus der DE 36 38 890 C2 für Axialkolbenmaschinen mit konstantem Verdrängungsvolumen bekannte Lösung bei Axialkolbenmaschinen mit variablem Verdrängungsvolumen in Schwenkschlittenbauweise in der Praxis nicht bewährt.For the reasons mentioned above, the one from DE 36 38 890 C2 Axial piston machines with a constant displacement known solution Axial piston machines with variable displacement in swivel slide design not proven in practice.

Der Erfindung liegt daher die Aufgabe zugrunde, für eine Axialkolbenmaschine in Schwenkschlittenbauweise eine geeignete Spülmittelversorgung zur Verfügung zu stellen.The invention is therefore based on the object for an axial piston machine in To provide a suitable flushing agent supply.

Die Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 in Verbindung mit den gattungsbildenden Merkmalen gelöst.The object is in connection with the characterizing features of claim 1 solved with the generic features.

Der Erfindung liegt die Erkenntnis zugrunde, daß der Spülmittelkanal für die Spülmittelversorgung der Triebwellenlagerung und ggfs. zusätzlich für die Gehäusespülung in einfacher Weise durch den Stellzapfen und den Steuerspiegelkörper hindurch bis an den Mittelzapfen geführt werden kann. Das Spül- und Speisedruckventil kann dann außerhalb des Steuerspiegelkörpers angeordnet sein, was die Konstruktion des Steuerspiegelkörpers wesentlich vereinfacht, so daß die mechanische Festigkeit des Steuerspiegelkörpers durch die für die Ausbildung des Spülkanals erforderlichen Maßnahmen nicht geschwächt wird. Zudem bietet sich der Vorteil, daß ein extern vorsehbares Spül- und Speisedruckventil von außen einstellbar ist und die in den Spülmittelkanal eingeleitete Spülmittelmenge an den tatsächlichen Bedarf in einfacher Weise angepaßt werden kann.The invention is based on the finding that the detergent channel for Flushing agent supply for the drive shaft bearing and, if necessary, additional for flushing the housing in a simple manner through the adjusting pin and the control mirror body to the Center pin can be guided. The flushing and feed pressure valve can then be outside of the control mirror body may be arranged, which is the construction of the control mirror body significantly simplified, so that the mechanical strength of the control mirror body by the measures required for the formation of the flushing channel are not weakened. In addition, there is the advantage that an externally provided flushing and feed pressure valve from is adjustable on the outside and the amount of detergent introduced into the detergent channel to the actual needs can be easily adjusted.

Die Ansprüche 2 bis 8 beinhalten vorteilhafte Weiterbildungen der Erfindung.Claims 2 to 8 contain advantageous developments of the invention.

Die Zentralbohrung des Steuerspiegelkörpers zur Aufnahme des Stellzapfens kann entsprechend Anspruch 2 gleichzeitig Teil des Spülmittelkanals sein, so daß an dem Steuerspiegelkörper zur Ausbildung des Spülmittelkanals keine konstruktiven Veränderungen notwendig sind. In dem Stellzapfen kann entsprechend Anspruch 3 eine Bohrung ausgebildet sein, die in diesem Bereich den Spülmittelkanal bildet und in die Zentralbohrung des Steuerspiegelkörpers ausmündet. Die einzig notwendige Modifikation des Stellzapfens für den Spülmittelkanal ist dabei die Ausbildung dieser Bohrung. Die Bohrung kann mit einem derart geringen Durchmesser ausgebildet werden, daß die mechanische Festigkeit des Stellzapfens durch diese Maßnahme unwesentlich, insbesondere um weniger als 1 %, geschwächt wird.The central bore of the control mirror body for receiving the adjusting pin can according to claim 2 at the same time be part of the detergent channel, so that on the Control mirror body to form the detergent channel no constructive Changes are necessary. In the trunnion can according to claim 3 Be formed bore that forms the detergent channel in this area and into the Central bore of the control mirror body opens out. The only necessary modification of the adjusting pin for the detergent channel is the formation of this hole. The Bore can be formed with such a small diameter that the mechanical strength of the adjusting pin is insignificant due to this measure, especially weakened by less than 1%.

Die Stelleinrichtung kann entsprechend Anspruch 4 einen hydraulisch betätigbaren Stellkolben aufweisen, in welchem eine Querbohrung ausgebildet ist, um den Stellzapfen aufzunehmen. Der Stellkolben kann entsprechend Anspruch 5 in einer in einer Abschlußplatte ausgebildeten Längsbohrung geführt sein, die mit einer Längsrille versehen ist, in die die Bohrung des Stellzapfens entweder unmittelbar oder mittelbar über die Querbohrung des Stellkolbens ausmündet. Die Längsrille gewährleistet dabei eine Spülmittelversorgung in jeder Stellung des Stellkolbens und des in diesen eingesetzten Stellzapfens. Unabhängig von der Schwenkposition der Zylindertrommel, des Steuerspiegelkörpers und des in den Stellkolben eingesetzten Stellzapfens ist dabei eine Verbindung der Bohrung des Stellzapfens mit der in der Abschlußplatte vorgesehenen Längsrille sichergestellt. Die Längsrille kann entsprechend Anspruch 6 mit einer Zufuhrleitung für das Spülmittel verbunden sein. Das Spül- und Speisedruckventil zur Einleitung des Spülmittels in den Spülmittelkanal kann an der Ausmündung der Zuführleitung extern an der Abschlußplatte montiert sein. Das Spül- und Speisedruckventil ist dabei besonders gut von außen zugänglich und einstellbar.According to claim 4, the actuating device can be operated hydraulically Have adjusting piston in which a transverse bore is formed around the adjusting pin to record. The actuating piston can according to claim 5 in one End plate trained longitudinal bore to be provided, which are provided with a longitudinal groove is, in which the bore of the adjusting pin either directly or indirectly via the Cross bore of the control piston opens. The longitudinal groove ensures one Detergent supply in every position of the control piston and the one used in it Adjusting pin. Regardless of the pivoting position of the cylinder drum, the Control mirror body and the adjusting pin inserted in the adjusting piston is one Connection of the hole of the adjusting pin with that provided in the end plate Longitudinal groove ensured. The longitudinal groove can according to claim 6 with a Supply line for the detergent be connected. The flushing and feed pressure valve for Introducing the detergent into the detergent channel can be at the mouth of the Supply line must be mounted externally on the end plate. The flushing and feed pressure valve is particularly accessible and adjustable from the outside.

Entsprechend Anspruch 8 kann der erfindungsgemäße Spülmittelkanal neben einer Spülmittelversorgung der Triebwellenlagerung gleichzeitig auch einer Gehäusespülung dienen. Dadurch ergibt sich eine besonders günstige Wärmebilanz der Axialkolbenmaschine, da durch das Spülmittel die Verlustwärme der Axialkolbenmaschine mit abgeführt wird.According to claim 8, the detergent channel according to the invention can be next to one Flushing agent supply for the drive shaft bearing and also a housing flush serve. This results in a particularly favorable heat balance Axial piston machine, because the detergent dissipates the heat loss of the axial piston machine is carried away.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die Zeichnung näher beschrieben. In der Zeichnung zeigen:

Fig. 1
einen Längsschnitt durch ein Ausführungsbeispiel der erfindungsgemäßen Axialkolbenmaschine; und
Fig. 2
einen Schnitt entlang der Linie A-A in Fig. 1.
An exemplary embodiment of the invention is described in more detail below with reference to the drawing. The drawing shows:
Fig. 1
a longitudinal section through an embodiment of the axial piston machine according to the invention; and
Fig. 2
a section along the line AA in Fig. 1st

Fig. 1 zeigt ein Ausführungsbeispiel einer erfindungsgemäßen Axialkolbenmaschine in Schwenkschlittenbauweise in einem axialen Längsschnitt.Fig. 1 shows an embodiment of an axial piston machine according to the invention in Swivel carriage design in an axial longitudinal section.

In einem Gehäuse 2 der Axialkolbenmaschine 1 ist eine Triebwelle 3 über zwei Wälzlager 4 und 5 drehbar gelagert. An die Triebwelle 3 ist ein Triebwellenflansch 6 im Ausführungsbeispiel einstückig angeformt. In dem Gehäuseinnenraum 7 ist eine Zylindertrommel 8 um eine Schwenkachse senkrecht zur Zeichenebene schwenkbar angeordnet. In der Zylindertrommel 8 sind mehrere auf einem Teilkreis mit gleichem Abstand angeordnete Zylinderbohrungen 9, 10 vorgesehen. In den Zylinderbohrungen 9, 10 sind Kolben 11, 12 verschiebbar geführt, die außerhalb der Zylindertrommel 8 zu Kugelköpfen 13, 14 ausgeformt sind. Die Kugelköpfe 13, 14 der Kolben 11, 12 sind in sphärischen Lagern 15 des Triebwellenflansches 6 angelenkt. In a housing 2 of the axial piston machine 1 there is a drive shaft 3 via two roller bearings 4 and 5 rotatably mounted. On the drive shaft 3 is a drive shaft flange 6 in Embodiment molded in one piece. In the housing interior 7 is one Cylinder drum 8 can be pivoted about a pivot axis perpendicular to the plane of the drawing arranged. In the cylinder drum 8 are several on a pitch circle with the same Spaced cylinder bores 9, 10 are provided. In the cylinder bores 9, 10 pistons 11, 12 are slidably guided outside the cylinder drum 8 Ball heads 13, 14 are formed. The ball heads 13, 14 of the pistons 11, 12 are in spherical bearings 15 of the drive shaft flange 6 articulated.

Die Zylindertrommel 8 ist an dem Triebwellenflansch 6 über einen Mittelzapfen 16 drehbar und verschwenkbar gelagert. Zwischen einer Abschlußplatte 17 und der Zylindertrommel 8 ist an der dem Triebwellenflansch 6 abgewandten Seite der Zylindertrommel 8 ein im Ausführungsbeispiel linsenförmig ausgebildeter Steuerspiegelkörper 18 angeordnet. Die Zylindertrommel 8 ist über eine in dem Mittelzapfen 16 vorgesehene Feder 19 gegen den Steuerspiegelkörper 18 bzw. die Abschlußplatte 17 vorgespannt. Der Mittelzapfen 16 weist ebenfalls einen Kugelkopf 20 auf, der in einem weiteren sphärischen Lager 21 des Triebwellenflansches 6 drehbar und schwenkbar gelagert ist.The cylinder drum 8 is on the drive shaft flange 6 via a central pin 16 rotatably and pivotably mounted. Between an end plate 17 and the Cylinder drum 8 is on the side facing away from the drive shaft flange 6 Cylinder drum 8 a lens-shaped in the embodiment Control mirror body 18 arranged. The cylinder drum 8 is in a Center pin 16 provided spring 19 against the control mirror body 18 or the End plate 17 biased. The central pin 16 also has a ball head 20 on, which is rotatable in a further spherical bearing 21 of the drive shaft flange 6 and is pivotally mounted.

Beim Verschwenken der in Fig. 1 in maximal ausgeschwenkter Position dargestellten Zylindertrommel 8 dient der Steuerspiegelkörper 18 als Schwenkschlitten. Eine gegenüber der Zylindertrommel 8 gelegene teilzylinderförmige oder sphärische Begrenzungsfläche 22 des Steuerspiegelkörpers 18 gleitet beim Verstellen der Zylindertrommel 8 an einer entsprechend ausgeformten Gleitfläche 23 der Abschlußplatte 17 entlang. Dabei dient die Stellschraube 24 der Einstellung des minimalen Verdrängungsvolumens der Axialkolbenmaschine 1.When pivoting the position shown in Fig. 1 in the maximum pivoted position Cylinder drum 8 serves the control mirror body 18 as a swivel slide. One opposite the partially cylindrical or spherical boundary surface 22 of the cylinder drum 8 of the control mirror body 18 slides when adjusting the cylinder drum 8 on one correspondingly shaped sliding surface 23 along the end plate 17. The serves Adjustment screw 24 of the setting of the minimum displacement volume Axial piston machine 1.

Der Steuerspiegelkörper 18 weist eine Zentralbohrung 24 auf, in welche ein Stellzapfen 25 so eingesetzt ist, daß der Stellzapfen 25 zum Ausgleich der Schwenkbewegung des Steuerspiegelkörpers 18 in dessen Zentralbohrung 24 schwenkbar und axial verschiebbar ist.The control mirror body 18 has a central bore 24, into which an adjusting pin 25 is used so that the adjusting pin 25 to compensate for the pivoting movement of the Control mirror body 18 pivotable and axially displaceable in its central bore 24 is.

Zur hydraulischen Verstellung des Schwenkwinkels der Zylindertrommel 8 ist eine allgemein mit dem Bezugszeichen 26 versehene Stelleinrichtung vorgesehen, die einen in einer Längsbohrung 27 der Abschlußplatte 17 verschiebbaren Stellkolben 28 umfaßt. Der Stellzapfen 25 ist in eine Querbohrung 29 des Stellkolbens 28 eingesetzt. Der Stellkolben 28 ist über eine an einem Anschluß 30 anschließbare Stelldruckleitung mit einem Stelldruck so beaufschlagbar, daß der Stellkolben 28 gegen eine Rückstellfeder 31 verschiebbar ist. Dabei wird die Axialkolbenmaschine 1 in Richtung auf kleineres Verdrängungsvolumen zurückgeschwenkt. For the hydraulic adjustment of the pivot angle of the cylinder drum 8 is one Provided generally with the reference numeral 26, an actuator in a longitudinal bore 27 of the end plate 17 displaceable adjusting piston 28 comprises. The Adjusting pin 25 is inserted into a transverse bore 29 of the adjusting piston 28. The actuating piston 28 is connected to a control pressure line connected to a connection 30 with a Actuating pressure can be applied so that the actuating piston 28 against a return spring 31st is movable. The axial piston machine 1 is in the direction of smaller Displacement swung back.

Erfindungsgemäß ist die Axialkolbenmaschine 1 mit einem Spülmittelkanal zur Spülmittelversorgung der Triebwellenlagerung 4, 5 versehen. Der Spülmittelkanal umfaßt eine in der Abschlußplatte 17 vorgesehene Zuführleitung 40, an welcher ein Spül- und Speisedruckventil 41 angeschlossen ist. Das Spül- und Speisedruckventil 41 ist extern an der Abschlußplatte 17 angeordnet und zur Einstellung des Spülmitteldrucks und der Spülmittelmenge daher von außen leicht zugänglich. Die Zuführleitung 40 mündet in eine Längsrille 42, die peripher an der Längsbohrung 27 vorgesehen ist. Weiterhin ist in dem Stellzapfen 25 eine Bohrung 43 vorgesehen, die auf der dem Steuerspiegelkörper 18 abgelegenen Seite entweder unmittelbar in die Längsrille 42 ausmündet oder, wie im in Fig. 1 dargestellten Ausführungsbeispiel, mittelbar über die Querbohrung 29 in die Längsrille 42 ausmündet. Die Länge der Längsrille 42 ist so bemessen, daß in jeder Schwenkstellung der Zylindertrommel 8 eine Verbindung zwischen der Bohrung 43 des Stellzapfens 25 und der Längsrille 42 sichergestellt ist.According to the invention, the axial piston machine 1 is provided with a detergent channel Provide detergent supply for the drive shaft bearings 4, 5. The detergent channel includes a supply line 40 provided in the end plate 17, on which a flushing and Feed pressure valve 41 is connected. The purge and feed pressure valve 41 is on externally the end plate 17 arranged and for adjusting the detergent pressure and The amount of detergent is therefore easily accessible from the outside. The feed line 40 opens into a Longitudinal groove 42 which is provided peripherally on the longitudinal bore 27. Furthermore, in the Adjusting pin 25 a bore 43 is provided which on the control mirror body 18th remote side either opens directly into the longitudinal groove 42 or, as in in Fig. 1 illustrated embodiment, indirectly via the transverse bore 29 in the Longitudinal groove 42 opens out. The length of the longitudinal groove 42 is such that in each Pivot position of the cylinder drum 8 a connection between the bore 43 of the Adjusting pin 25 and the longitudinal groove 42 is ensured.

Zur besseren Verdeutlichung der Spülmittelkanalführung in diesem Bereich ist in Fig. 2 ein Schnitt entlang der Linie A-A dargestellt. Gezeigt ist ein Querschnitt der Abschlußplatte 17 und der in der Abschlußplatte 17 zur Führung des Stellkolbens 28 vorgesehenen Längsbohrung 27. Erkennbar ist ferner der nur ausschnittsweise dargestellte, in die Querbohrung 29 des Stellkolbens 28 eingesetzte Stellzapfen 25. Wie bereits beschrieben, weist der Stellzapfen 25 eine axiale Bohrung 43 auf, die Teil des erfindungsgemäßen Spülmittelkanals ist. Die Zuführleitung 40 ist, wie ebenfalls aus der Fig. 2 zu erkennen, mit der peripher an der Längsbohrung 27 vorgesehenen Längsrille 42 verbunden. Die Bohrung 43 des Stellzapfens 25 mündet mittelbar über die in dem Bereich 44 durch den Stellzapfen 25 nicht ausgefüllte Querbohrung 29 des Stellkolbens 28 in die Längsrille 42 aus. Es ist jedoch auch möglich, daß die Bohrung 43 des Stellzapfens 25 in die Längsrille 42 unmittelbar ausmündet, wenn der Stellzapfen 25 die Querbohrung 29 vollständig ausfüllt.For better clarification of the detergent channel guide in this area, in FIG. 2 a section along the line A-A is shown. A cross section of the is shown End plate 17 and in the end plate 17 for guiding the actuating piston 28 provided longitudinal bore 27. The only partially shown adjusting pins 25 inserted into the transverse bore 29 of the actuating piston 28. As already mentioned described, the adjusting pin 25 has an axial bore 43 which is part of the detergent channel according to the invention. The feed line 40 is, as also from the 2, with the longitudinal groove 42 provided peripherally on the longitudinal bore 27 connected. The bore 43 of the adjusting pin 25 opens out indirectly via that in the area 44 through the adjusting pin 25 not filled transverse bore 29 of the actuating piston 28 in the Longitudinal groove 42 out. However, it is also possible that the bore 43 of the adjusting pin 25 in the longitudinal groove 42 opens out immediately when the adjusting pin 25 has the transverse bore 29 completely filled out.

Durch die in dem Stellzapfen 25 vorgesehene Bohrung 43 wird die mechanische Festigkeit des Stellzapfens 25 nur unwesentlich beeinträchtigt. Der Durchmesser der Bohrung 43 kann derart gering bemessen werden, daß sich eine Verringerung der mechanischen Festigkeit von weniger als 1 % ergibt. Auch die mechanische Festigkeit des Steuerspiegelkörpers 18 wird durch die erfindungsgemäßen Maßnahmen nicht beeinflußt, da die erfindungsgemäße Lösung keine konstruktive Änderung des Steuerspiegelkörpers 18 notwendig macht.The mechanical strength is provided by the bore 43 provided in the adjusting pin 25 of the adjusting pin 25 only slightly affected. The diameter of the bore 43 can be dimensioned so small that there is a reduction in mechanical Strength of less than 1% results. The mechanical strength of the Control mirror body 18 is not influenced by the measures according to the invention, since the solution according to the invention does not change the design of the control mirror body 18 makes necessary.

Wie aus Fig. 1 zu erkennen, verläuft der Spülmittelkanal im weiteren durch die Zentralbohrung 24 des Steuerspiegelkörpers 18. Dabei ist hervorzuheben, daß die ohnehin vorhandene Zentralbohrung 24 des Steuerspiegelkörpers 18 ohne weitere Modifikation auch die Aufgabe der Zuleitung des Spülmittels übernimmt. Der Spülmittelkanal verläuft im weiteren durch eine Axialbohrung 44 in der Zylindertrommel 8 und eine Bohrung 45 in dem Federteller 46, um in den Federraum 47 des Mittelzapfens 16 einzumünden. In dem Mittelzapfen 16 verläuft daran anschließend eine Zentralbohrung 48 von dem Federraum 47 bis zu dem sphärischen Lager 21. In der Triebwelle 3 sind weitere Verbindungskanäle 49, 50 und 51 vorgesehen, die unmittelbar im Bereich der Wälzlager 4, 5 ausmünden. An dem sphärischen Lager 21 sind sowohl die Zentralbohrung 48 des Mittelzapfens 16 als auch die Einmündung des Verbindungskanals 49 mit trompetenförmigen Erweiterungen versehen, um sicherzustellen, daß in jeder Verschwenkposition der Zylindertrommel 8 ein Spülmittelfluß ermöglicht wird.As can be seen from Fig. 1, the detergent channel continues through the Central bore 24 of the control mirror body 18. It should be emphasized that the anyway existing central bore 24 of the control mirror body 18 without further modification also takes on the task of supplying the detergent. The detergent channel runs further through an axial bore 44 in the cylinder drum 8 and a bore 45 in the spring plate 46 to open into the spring space 47 of the center pin 16. By doing Center pin 16 then runs a central bore 48 from the spring chamber 47 up to the spherical bearing 21. In the drive shaft 3 there are further connecting channels 49, 50 and 51 are provided, which open out directly in the area of the roller bearings 4, 5. On the spherical bearing 21 are both the central bore 48 of the central pin 16 and also the junction of the connecting channel 49 with trumpet-shaped extensions provided to ensure that in each pivoting position of the cylinder drum 8 Detergent flow is made possible.

Nach Durchströmen der Triebwellenlagerung 4, 5 strömt das Spülmittel in den Gehäuseinnenraum 7 ein, um diesen über die Gehäuseöffnung 52 als Leckfluid zu verlassen. Dadurch wird gleichzeitig eine Gehäusespülung gewährleistet, die u.a. der Wärmeabführung der Verlustwärme dient. Auf diese Weise wird die Wärmebilanz der Axialkolbenmaschine 1 verbessert.After flowing through the drive shaft bearing 4, 5, the detergent flows into the Housing interior 7 to this as leakage fluid through the housing opening 52 leave. This also ensures that the housing is flushed, which, among other things, the Heat dissipation is used for waste heat. In this way, the heat balance of the Axial piston machine 1 improved.

Der Spülmittelfluß ist zur besseren Veranschaulichung der Erfindung durch die in Fig.1 eingezeichneten Pfeile dargestellt.The detergent flow is for better illustration of the invention by the in Fig.1 shown arrows.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel begrenzt. Insbesondere könnte der Spülmittelzufluß zu dem Stellzapfen 25 auch in anderer Weise, z.B. über den Stellkolben 28, erfolgen.The invention is not limited to the illustrated embodiment. In particular the detergent flow to the adjusting pin 25 could also be in other ways, e.g. on the Adjusting piston 28 take place.

Claims (8)

  1. Axial piston machine (1) of the pivoting carriage type of construction, having
    a pivotable cylinder drum (8),
    a drive shaft (3) which is mounted in a drive shaft bearing arrangement (4, 5) and is connected to a drive shaft flange (6) on which pistons (11, 12) movable in cylinder bores (9, 10) in the cylinder drum (8) are articulated and on which the said cylinder drum (8) is supported via a central journal (16), a flushing duct (45, 47 to 51) for supplying the drive shaft bearing arrangement (4, 5) with flushing agent being provided in the central journal (16) and in the drive shaft (3),
    a control mirror body (18) having control nodules in order to connect the cylinder bores (9, 10) cyclically to a high-pressure line and a low-pressure line, and
    a positioning arrangement (26) through the actuation of which the cylinder drum (8), together with the control mirror body (18), can be tilted, wherein the positioning arrangement (26) is connected to the control mirror body (18) via a positioning journal (25),
    characterised in that
    the flushing agent duct (43, 24) is routed through the positioning journal (25) and the control mirror body (18) as far as the central journal (16).
  2. Axial piston machine according to claim 1,
    characterised in that
    the control mirror body (18) has a central bore (24) in which the positioning journal (25) is guided and which is part of the flushing agent duct.
  3. Axial piston machine according to claim 2,
    characterised in that
    a bore (43), which is part of the flushing agent duct and which opens into the central bore (24) in the control mirror body (18), is constructed in the positioning journal (25).
  4. Axial piston machine according to one of claims 1 to 3,
    characterised in that
    the control arrangement (26) comprises a hydraulically actuatable positioning piston (28) which has a transverse bore (29) in which the positioning journal (25) is inserted.
  5. Axial piston machine according to claims 3 and 4,
    characterised in that
    the positioning piston (28) is guided in a longitudinal bore (27) which is constructed in a closing plate (17) and is provided with at least one longitudinal groove (42) into which the bore (43) in the positioning journal (25) opens, either directly or else indirectly via the transverse bore (29) in the positioning piston (28).
  6. Axial piston machine according to claim 5,
    characterised in that
    an in-feed line (40) is constructed in the closing plate (17) in order to feed in the flushing agent to the longitudinal groove (42).
  7. Axial piston machine according to claim 6,
    characterised in that
    the in-feed line (40) is connected to a flushing and feeding pressure valve (41).
  8. Axial piston machine according to one of claims 1 to 7,
    characterised in that
    flushing of the housing takes place at the same time by means of the flushing agent duct (40 - 43, 24, 44, 45, 47 - 51), and the flushing agent leaves the housing (2) of the axial piston machine (1) via an opening in the said housing (52).
EP97948792A 1996-11-27 1997-10-23 Axial piston motor with bearing flushing Expired - Lifetime EP0941403B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19649195A DE19649195C1 (en) 1996-11-27 1996-11-27 Axial piston machine with swivelling cylinder drum
DE19649195 1996-11-27
PCT/EP1997/005870 WO1998023860A1 (en) 1996-11-27 1997-10-23 Axial piston motor with bearing flushing

Publications (2)

Publication Number Publication Date
EP0941403A1 EP0941403A1 (en) 1999-09-15
EP0941403B1 true EP0941403B1 (en) 2001-12-19

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EP97948792A Expired - Lifetime EP0941403B1 (en) 1996-11-27 1997-10-23 Axial piston motor with bearing flushing

Country Status (4)

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US (1) US6279452B1 (en)
EP (1) EP0941403B1 (en)
DE (2) DE19649195C1 (en)
WO (1) WO1998023860A1 (en)

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Also Published As

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US6279452B1 (en) 2001-08-28
DE59705918D1 (en) 2002-01-31
EP0941403A1 (en) 1999-09-15
WO1998023860A1 (en) 1998-06-04
DE19649195C1 (en) 1998-01-08

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