EP3093489B1 - Hydrostatic axial piston machine with inclined axes - Google Patents

Hydrostatic axial piston machine with inclined axes Download PDF

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Publication number
EP3093489B1
EP3093489B1 EP16167902.2A EP16167902A EP3093489B1 EP 3093489 B1 EP3093489 B1 EP 3093489B1 EP 16167902 A EP16167902 A EP 16167902A EP 3093489 B1 EP3093489 B1 EP 3093489B1
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EP
European Patent Office
Prior art keywords
control
control base
cylinder drum
axis
axial piston
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.)
Active
Application number
EP16167902.2A
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German (de)
French (fr)
Other versions
EP3093489A1 (en
Inventor
Martin Bergmann
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.)
Linde Hydraulics GmbH and Co KG
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Linde Hydraulics GmbH and Co KG
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Publication of EP3093489A1 publication Critical patent/EP3093489A1/en
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Publication of EP3093489B1 publication Critical patent/EP3093489B1/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
    • F04B1/22—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 having two or more sets of cylinders or pistons
    • F04B1/24—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 having two or more sets of cylinders or pistons inclined to the main shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F03C1/0639—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
    • F03C1/0642—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons inclined on main shaft axis
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/0808—Carbon, e.g. graphite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/083—Nitrides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/10—Hardness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/14—Self lubricating materials; Solid lubricants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the invention relates to a hydrostatic axial piston machine of bent-axis design, having a drive shaft which is arranged to be rotatable about an axis of rotation and is provided with a drive flange, and a cylinder drum which is arranged to be rotatable about an axis of rotation, the cylinder drum being provided with a plurality of piston recesses arranged concentrically to the axis of rotation of the cylinder drum, in which in each case one piston connected to the drive flange is arranged to be longitudinally displaceable, with the cylinder drum resting against a control base provided with a control surface, and with the axial piston machine being designed as an adjusting machine with a variable displacement volume, with the control base being pivotable about a pivot axis with a pivot surface opposite the control surface a control base receptacle of the housing is arranged, with a slide bearing being formed between the pivoting surface of the control base and the control base receptacle of the housing.
  • a generic hydrostatic axial piston machine in bent-axis construction which is designed as an adjusting machine with a variable displacement volume, is from DE 10 2013 108 407 A1 and from the DE 103 47 086 A1 known.
  • control base In the case of bent-axis machines designed as adjustment machines, the control base is pivoted in the control base receptacle of the housing in order to change the displacement volume.
  • a sliding bearing is formed between the control base and the control base receptacle, which is formed by a pivoting surface arranged on the end face of the control base and a receiving surface of the control base receptacle of the housing, in which the control base is slidably received.
  • control base mount Due to the large mass of the control floor mount and the large dimensions of the control floor mount and the large dimensions of the receiving surface of the control base receptacle, in which the control base is pivoted with the pivoting surface, the heat treatment of the receiving surface of the control base is very complex and causes high production costs.
  • an axial piston machine with a constant displacement volume in which the pistons, which can be moved longitudinally in the cylinder drum, are supported on a lifting track by means of rolling elements and in which a positive hold-down device is provided, which prevents the pistons provided with the rolling elements from lifting off the lifting track.
  • the positive holddown consists of a holddown groove in which each piston is engaged by an engagement means.
  • a friction-reducing hard material layer can be provided between the hold-down track and the engagement means arranged on the piston.
  • the DE 10 2004 033 321 A1 discloses a swash plate machine in which a friction- and wear-reducing layer is arranged on the control surface of the control base--ie between the control base and the cylinder drum.
  • the present invention is based on the object of making available a bent-axis machine of the type mentioned at the outset, which can be produced more cost-effectively.
  • a wear-reducing hard material layer is applied to the pivoting surface of the control base, the control base receptacle having a receptacle surface receiving the pivoting surface of the control base, the control base receptacle being made of metal or cast iron and the receiving surface of the control base receptacle not having any surface hardening.
  • the pivoting surface of the control base with which the control base is pivoted in the control base receptacle, is provided with a wear-reducing hard material layer, for example coated.
  • a wear-reducing hard material layer on the pivot surface of the control base, in contrast to a heat treatment and a hardening process of the larger receiving surface of the control base receptacle, the reduction in wear on the plain bearing between the control base and the control base receptacle can be achieved significantly more cost-effectively, so that the bent-axis machine according to the invention can be produced more cost-effectively.
  • the control base mount accommodates the pivoting surface of the control base with a mounting surface, the control base mount being made of metal or cast iron and the mounting surface of the control base mount not having any surface hardening. Due to the inventive application of the wear-reducing hard material layer on the pivoting surface of the control base, it is not necessary to laboriously harden the receiving surface of the control base receptacle, for example nitriding, so that a reduction in the manufacturing costs of the bent-axis machine according to the invention can be achieved.
  • a wear-reducing hard material layer is applied to the control surface of the control base.
  • one end of the cylinder drum rests against the control surface of the control base and slides along the control surface of the control base when the cylinder drum rotates.
  • a layer of non-ferrous metal to the end face of the cylinder drum, for example by a sintering process.
  • a sintering process for applying the non-ferrous metal layer to the end face of the cylinder drum is complex and causes high production costs for the bent-axis machine.
  • control surface of the control base is provided with a wear-reducing hard material layer, for example coated, the reduction in wear on the plain bearing between the control base and the cylinder drum can be achieved significantly more cost-effectively than with a sintered non-ferrous metal layer on the front side of the cylinder drum that a further reduction in the manufacturing costs of the bent-axis machine according to the invention can be achieved.
  • the hard material layer is designed as a carbon-containing layer.
  • the hard material layer is designed as a chromium nitride layer.
  • the hard material layer is preferably applied in a PVD method (physical vapor deposition).
  • the hard material layer can be applied to the pivoting surface of the control base and optionally also to the control surface of the control base with little production effort, and the control base can be coated on one or both sides with a hard material layer.
  • the cylinder drum rests with an end face on the control surface of the control base, the cylinder drum being made of metal and the end face of the cylinder drum being designed without a coating or without a layer of non-ferrous metal.
  • the application of the wear-reducing hard material layer on the control surface of the control base means that a non-ferrous metal layer that is laboriously applied by a sintering process on the front side of the cylinder drum can be omitted, so that a further reduction in the manufacturing costs of the bent-axis machine according to the invention can be achieved.
  • FIG. 1 1 shows a longitudinal section of a hydrostatic axial piston machine 1 according to the invention in a bent-axis design, which is designed as an adjusting machine with a variable displacement volume.
  • the axial piston machine 1 designed as a bent-axis machine has a housing 2 in which a drive shaft 4 provided with a drive flange 3 is rotatably mounted about an axis of rotation 6 by means of a bearing device 5 .
  • a cylinder drum 7 Arranged axially adjacent to the drive flange 6 is a cylinder drum 7 , which is rotatable about an axis of rotation 8 , within the housing 2 Piston recesses 9 is provided, in each of which a piston 10 is arranged to be longitudinally displaceable.
  • the pistons 10 are each connected to the drive flange 3 .
  • a connecting rod 11 is provided for this purpose.
  • the connecting rod 11 is articulated both on the associated piston 10 and on the drive flange 3 by means of a ball joint.
  • the cylinder drum 7 rests with an end face 7a on a control base 17 provided with a control surface 16 .
  • a sliding bearing is formed between the control surface 16 of the control base 17 and the end face 7a of the cylinder drum 7, with the cylinder drum 7 being rotatably fixed about the rotational axis 8 with the end face 7a on the control surface 16 of the cylinder drum 7 during operation of the bent-axis machine when the cylinder drum 7 rotates about the rotational axis 8 Housing 2 arranged control base 17 passes along.
  • the cylinder drum 7 is supported on a supporting pin 12 which is articulated to the drive flange 3 by a ball joint, with a spring 18 also being supported on the supporting pin 12, which presses the cylinder drum 7 against the control surface 16 of the control base 17.
  • the supporting pin 12 is arranged concentrically to the axis of rotation 8 of the cylinder drum 7 .
  • Kidney-shaped control recesses are formed in control surface 16 of control base 17 to control the supply and discharge of pressure medium in the displacement chambers formed by piston recesses 9 and piston 10, which form an inlet port 19 and an outlet port 20 of axial piston machine 1.
  • the cylinder drum 7 is provided with a control opening 21 at each piston recess 9 .
  • the axial piston machine 1 shown is designed as an adjusting machine with a variable displacement volume.
  • the angle of inclination of the axis of rotation 8 of the cylinder drum 7 with respect to the axis of rotation 6 of the drive shaft 4 is used to change the displacement volume adjustable.
  • the control base 17 provided with the control surface 16 is designed as a rocker body which is arranged in a control base receptacle 2a of the housing 2 such that it can pivot about a pivot axis S.
  • the control base mount 2a is attached to the housing 2.
  • the pivot axis S of the control base 17 and thus of the cylinder drum 7 lies on the intersection S of the axis of rotation 6 of the drive shaft 4 and the axis of rotation 8 of the cylinder drum 7 and is perpendicular to the axes of rotation 6 and 8.
  • an actuating device formed by an actuating piston 22 is provided, which is in operative connection with the control base 17 .
  • the actuating piston 22 is provided with the connecting pin 23 which is connected to the control base 17 in an articulated manner.
  • the control base 17 has a pivot surface 25 which is opposite the control surface 16 and with which the control base 17 is arranged in a receiving surface 26 of the control base receptacle 2a of the housing 2 .
  • a sliding bearing is formed between the pivoting surface 25 of the control base 17 and the receiving surface 26 of the control base receptacle 2a, with the control base 17 guiding along with the pivoting surface 25 on the retaining surface 26 of the control base receptacle 2a when the control base 17 is pivoted about the pivot axis S.
  • the pivoting surface 25 of the control base 17 and the receiving surface 26 of the control base receptacle 2a are each cylindrical, with a radius around the pivot axis S.
  • a wear-reducing hard material layer 30 is applied to the pivot surface 25 of the control base 17 designed as a sliding surface.
  • the hard material layer 30 is designed as a carbon-containing hard material layer or as a chromium nitride layer, which is applied to the cylindrical pivoting surface 25 of the control base 17 using a PVD method (physical vapor deposition).
  • the control base mount 2a is made of metal or cast iron and the mounting surface 26 of the control base mount 2a has no surface hardening.
  • the coating of the pivoting surface 25 of the control base 17 according to the invention, which forms the running surface during the pivoting movement of the control base 17 about the pivot axis S, with the wear-reducing hard material layer 30 can be produced inexpensively and it can be a complex heat treatment and a complex hardening process, such as a nitriding process, the larger recording surface 26 of the control base recording 2a are dispensed with.
  • a wear-reducing hard material layer 31 can also be applied to the control surface 16 of the control base 17 in the bent-axis machine according to the invention.
  • the hard material layer 31 is formed as a carbon-containing hard material layer or as a chromium nitride layer, which is applied to the control surface 16 of the control base 17 using a PVD method (physical vapor deposition).
  • the cylinder drum 7 is made of metal and the end face 7a of the cylinder drum 7 is designed without a coating or without a layer of non-ferrous metal.
  • the coating of the control surface 16 of the control base 17 with the wear-reducing hard material layer 31 can be produced inexpensively and a sintered non-ferrous metal layer on the end face 7a of the cylinder drum 7, which is laboriously applied by a sintering process, can be dispensed with.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft eine hydrostatische Axialkolbenmaschine in Schrägachsenbauweise mit einer um eine Rotationsachse drehbar angeordneten Triebwelle, die mit einem Triebflansch versehen ist, und einer um eine Rotationsachse drehbar angeordneten Zylindertrommel, wobei die Zylindertrommel mit mehreren konzentrisch zur Rotationsachse der Zylindertrommel angeordneten Kolbenausnehmungen versehen ist, in denen jeweils ein mit dem Triebflansch verbundener Kolben längsverschiebbar angeordnet ist, wobei die Zylindertrommel an einem mit einer Steuerfläche versehenen Steuerboden anliegt, und wobei die Axialkolbenmaschine als Verstellmaschine mit einem veränderbaren Verdrängervolumen ausgebildet ist, wobei der Steuerboden mit einer der Steuerfläche gegenüberliegenden Schwenkfläche um eine Schwenkachse verschwenkbar in einer Steuerbodenaufnahme des Gehäuses angeordnet ist, wobei zwischen der Schwenkfläche des Steuerbodens und der Steuerbodenaufnahme des Gehäuses ein Gleitlager ausgebildet ist.The invention relates to a hydrostatic axial piston machine of bent-axis design, having a drive shaft which is arranged to be rotatable about an axis of rotation and is provided with a drive flange, and a cylinder drum which is arranged to be rotatable about an axis of rotation, the cylinder drum being provided with a plurality of piston recesses arranged concentrically to the axis of rotation of the cylinder drum, in which in each case one piston connected to the drive flange is arranged to be longitudinally displaceable, with the cylinder drum resting against a control base provided with a control surface, and with the axial piston machine being designed as an adjusting machine with a variable displacement volume, with the control base being pivotable about a pivot axis with a pivot surface opposite the control surface a control base receptacle of the housing is arranged, with a slide bearing being formed between the pivoting surface of the control base and the control base receptacle of the housing.

Eine gattungsgemäße hydrostatische Axialkolbenmaschine in Schrägachsenbauweise, die als Verstellmaschine mit einem veränderbarem Verdrängervolumen ausgebildet ist, ist aus der DE 10 2013 108 407 A1 und aus der DE 103 47 086 A1 bekannt.A generic hydrostatic axial piston machine in bent-axis construction, which is designed as an adjusting machine with a variable displacement volume, is from DE 10 2013 108 407 A1 and from the DE 103 47 086 A1 known.

Bei als Verstellmaschinen ausgebildeten Schrägachsenmaschinen wird für die Veränderung des Verdrängervolumens der Steuerboden in der Steuerbodenaufnahme des Gehäuses verschwenkt. Zwischen dem Steuerboden und der Steuerbodenaufnahme ist ein Gleitlager ausgebildet, das von einer an der Stirnseite des Steuerbodens angeordneten Schwenkfläche und einer Aufnahmefläche der Steuerbodenaufnahme des Gehäuses gebildet ist, in der der Steuerboden gleitend aufgenommen ist. Zur Verminderung des Verschleißes in dem Gleitlager zwischen dem Steuerboden und der Steuerbodenaufnahme ist es bekannt, die Aufnahmefläche der Steuerbodenaufnahme des Gehäuses einer Wärmebehandlung und einem Härtevorgang zu unterziehen, beispielsweise einem Nitriervorgang. Hierzu ist es bekannt, die Steuerbodenaufnahme zu gasnitrieren. Aufgrund der großen Masse der Steuerbodenaufnahme und der großen Abmessungen der Steuerbodenaufnahme sowie der großen Abmessungen der Aufnahmefläche der Steuerbodenaufnahme, in der der Steuerboden mit der Schwenkfläche verschwenkt wird, ist die Wärmebehandlung der Aufnahmefläche des Steuerbodens sehr aufwändig und verursacht hohe Herstellkosten.In the case of bent-axis machines designed as adjustment machines, the control base is pivoted in the control base receptacle of the housing in order to change the displacement volume. A sliding bearing is formed between the control base and the control base receptacle, which is formed by a pivoting surface arranged on the end face of the control base and a receiving surface of the control base receptacle of the housing, in which the control base is slidably received. In order to reduce wear in the plain bearing between the control base and the control base receptacle, it is known to subject the mounting surface of the control base receptacle of the housing to a heat treatment and a hardening process, for example a nitriding process. To this end, it is known to gas-nitride the control base mount. Due to the large mass of the control floor mount and the large dimensions of the control floor mount and the large dimensions of the receiving surface of the control base receptacle, in which the control base is pivoted with the pivoting surface, the heat treatment of the receiving surface of the control base is very complex and causes high production costs.

Aus der DE 10 2009 013 887 A1 ist eine Axialkolbenmaschine mit konstantem Verdrängervolumen bekannt, bei der die in der Zylindertrommel längsverschiebbaren Kolben mittels Wälzkörpern auf einer Hubbahn abgestützt sind und bei der eine formschlüssigen Niederhaltevorrichtung vorgesehen ist, die ein Abheben der mit den Wälzkörpern versehenen Kolben von der Hubbahn verhindert. Die formschlüssige Niederhaltevorrichtung besteht aus einer Niederhaltenut, in der jeder Kolben mittels eines Eingriffsmittels in Eingriff steht. Zwischen der Niederhaltebahn und dem am Kolben angeordneten Eingriffsmittel kann eine reibungsmindernde Hartstoffschicht vorgesehen werden.From the DE 10 2009 013 887 A1 an axial piston machine with a constant displacement volume is known, in which the pistons, which can be moved longitudinally in the cylinder drum, are supported on a lifting track by means of rolling elements and in which a positive hold-down device is provided, which prevents the pistons provided with the rolling elements from lifting off the lifting track. The positive holddown consists of a holddown groove in which each piston is engaged by an engagement means. A friction-reducing hard material layer can be provided between the hold-down track and the engagement means arranged on the piston.

Die DE 10 2004 033 321 A1 offenbart eine Schrägscheibenmaschine, bei der an der Steuerfläche des Steuerbodens - d.h. zwischen dem Steuerboden und der Zylindertrommel - eine reib- und verschleißmindernde Schicht angeordnet ist.the DE 10 2004 033 321 A1 discloses a swash plate machine in which a friction- and wear-reducing layer is arranged on the control surface of the control base--ie between the control base and the cylinder drum.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Schrägachsenmaschine der eingangs genannten Gattung zur Verfügung zu stellen, die kostengünstiger herstellbar ist.The present invention is based on the object of making available a bent-axis machine of the type mentioned at the outset, which can be produced more cost-effectively.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass auf der Schwenkfläche des Steuerbodens eine verschleißmindernde Hartstoffschicht aufgebracht ist, wobei die Steuerbodenaufnahme mit einer Aufnahmefläche die Schwenkfläche des Steuerbodens aufnimmt, wobei die Steuerbodenaufnahme aus Metall oder Guss besteht und die Aufnahmefläche der Steuerbodenaufnahme keine Oberflächenhärtung aufweist.This object is achieved according to the invention in that a wear-reducing hard material layer is applied to the pivoting surface of the control base, the control base receptacle having a receptacle surface receiving the pivoting surface of the control base, the control base receptacle being made of metal or cast iron and the receiving surface of the control base receptacle not having any surface hardening.

Erfindungsgemäß ist somit die Schwenkfläche des Steuerbodens, mit der der Steuerboden in der Steuerbodenaufnahme verschwenkt wird, mit einer verschleißmindernden Hartstoffschicht versehen, beispielsweise beschichtet. Im Vergleich zu der Aufnahmefläche der Steuerbodenaufnahme, entlang der der Steuerboden mit der Schwenkfläche verschwenkt wird, ist die Schwenkfläche des Steuerbodens wesentlich kleiner. Mit dem Aufbringen einer verschleißmindernden Hartstoffschicht auf der Schwenkfläche des Steuerbodens kann im Gegensatz zu einer Wärmebehandlung und einem Härtevorgang der größeren Aufnahmefläche der Steuerbodenaufnahme die Verschleißminderung an dem Gleitlager zwischen dem Steuerboden und der Steuerbodenaufnahme deutlich kostengünstiger erzielt werden, so dass die erfindungsgemäße Schrägachsenmaschine kostengünstiger herstellbar ist.According to the invention, the pivoting surface of the control base, with which the control base is pivoted in the control base receptacle, is provided with a wear-reducing hard material layer, for example coated. Compared to the mounting surface of the control base mount, along which the control base is pivoted with the pivoting surface, the pivoting surface of the Control floor much smaller. With the application of a wear-reducing hard material layer on the pivot surface of the control base, in contrast to a heat treatment and a hardening process of the larger receiving surface of the control base receptacle, the reduction in wear on the plain bearing between the control base and the control base receptacle can be achieved significantly more cost-effectively, so that the bent-axis machine according to the invention can be produced more cost-effectively.

Die Steuerbodenaufnahme nimmt mit einer Aufnahmefläche die Schwenkfläche des Steuerbodens auf, wobei die Steuerbodenaufnahme aus Metall oder Guss besteht und die Aufnahmefläche der Steuerbodenaufnahme keine Oberflächenhärtung aufweist. Durch das erfindungsgemäße Aufbringen der verschleißmindernden Hartstoffschicht an der Schwenkfläche des Steuerbodens ist es nicht erforderlich, die Aufnahmefläche der Steuerbodenaufnahme aufwändig zu härten, beispielsweise zu nitrieren, so dass eine Verringerung der Herstellkosten der erfindungsgemäßen Schrägachsenmaschine erzielbar ist.The control base mount accommodates the pivoting surface of the control base with a mounting surface, the control base mount being made of metal or cast iron and the mounting surface of the control base mount not having any surface hardening. Due to the inventive application of the wear-reducing hard material layer on the pivoting surface of the control base, it is not necessary to laboriously harden the receiving surface of the control base receptacle, for example nitriding, so that a reduction in the manufacturing costs of the bent-axis machine according to the invention can be achieved.

Gemäß einer vorteilhaften Weiterbildung der Erfindung ist auf der Steuerfläche des Steuerbodens eine verschleißmindernde Hartstoffschicht aufgebracht. Bei Schrägachsenmaschinen liegt die Zylindertrommel mit einer Stirnseite an der Steuerfläche des Steuerbodens an und gleitet bei einer Rotation der Zylindertrommel entlang der Steuerfläche des Steuerbodens. Um an dieser Gleitstelle und an diesem Gleitlager zwischen dem Steuerboden und der Zylindertrommel günstige Reibungs- und Verschleißeigenschaften zu erzielen, ist es bekannt, an der Stirnseite der Zylindertrommel eine Buntmetallschicht aufzubringen, beispielsweise durch einen Sintervorgang. Ein Sintervorgang zum Aufbringen der Buntmetallschicht an der Stirnseite der Zylindertrommel ist jedoch aufwändig und verursacht hohe Herstellkosten der Schrägachsenmaschine. Sofern gemäß der Weiterbildung der Erfindung die Steuerfläche des Steuerbodens mit einer verschleißmindernden Hartstoffschicht versehen ist, beispielsweise beschichtet ist, kann im Vergleich zu einer aufgesinterten Buntmetallschicht an der Stirnseite der Zylindertrommel die Verschleißminderung an dem Gleitlager zwischen dem Steuerboden und der Zylindertrommel deutlich kostengünstiger erzielt werden, so dass eine weitere Reduzierung der Herstellkosten der erfindungsgemäßen Schrägachsenmaschine erzielbar ist.According to an advantageous development of the invention, a wear-reducing hard material layer is applied to the control surface of the control base. In bent-axis machines, one end of the cylinder drum rests against the control surface of the control base and slides along the control surface of the control base when the cylinder drum rotates. In order to achieve favorable friction and wear properties at this sliding point and at this plain bearing between the control base and the cylinder drum, it is known to apply a layer of non-ferrous metal to the end face of the cylinder drum, for example by a sintering process. However, a sintering process for applying the non-ferrous metal layer to the end face of the cylinder drum is complex and causes high production costs for the bent-axis machine. If, according to the development of the invention, the control surface of the control base is provided with a wear-reducing hard material layer, for example coated, the reduction in wear on the plain bearing between the control base and the cylinder drum can be achieved significantly more cost-effectively than with a sintered non-ferrous metal layer on the front side of the cylinder drum that a further reduction in the manufacturing costs of the bent-axis machine according to the invention can be achieved.

Die Hartstoffschicht ist gemäß einer vorteilhaften Ausführungsform der Erfindung als kohlenstoffhaltige Schicht ausgebildet. Hierdurch ist mit geringem Bauaufwand eine Verschleißminderung an dem Gleitlager zwischen dem Steuerboden und der Steuerbodenaufnahme bzw. an dem Gleitlager zwischen dem Steuerboden und der Zylindertrommel erzielbar.According to an advantageous embodiment of the invention, the hard material layer is designed as a carbon-containing layer. As a result, a reduction in wear on the plain bearing between the control base and the control base receptacle or on the plain bearing between the control base and the cylinder drum can be achieved with little construction effort.

Die Hartstoffschicht ist gemäß einer alternativen und vorteilhaften Ausführungsform der Erfindung als Chrom-Nitrid-Schicht ausgebildet. Hierdurch ist mit geringem Bauaufwand eine Verschleißminderung an dem Gleitlager zwischen dem Steuerboden und der Steuerbodenaufnahme bzw. an dem Gleitlager zwischen dem Steuerboden und der Zylindertrommel erzielbar.According to an alternative and advantageous embodiment of the invention, the hard material layer is designed as a chromium nitride layer. As a result, a reduction in wear on the plain bearing between the control base and the control base receptacle or on the plain bearing between the control base and the cylinder drum can be achieved with little construction effort.

Bevorzugt ist gemäß einer Weiterbildung der Erfindung die Hartstoffschicht in einem PVD-Verfahren (Physical-Vapor-Deposition) aufgebracht. Mit einem derartigen Verfahren kann die Hartstoffschicht mit geringem Herstellungsaufwand an der Schwenkfläche des Steuerbodens und gegebenenfalls zusätzlich an der Steuerfläche des Steuerbodens aufgebracht werden und der Steuerboden an einer oder an beiden Seiten mit einer Hartstoffschicht beschichtet werden.According to a development of the invention, the hard material layer is preferably applied in a PVD method (physical vapor deposition). With such a method, the hard material layer can be applied to the pivoting surface of the control base and optionally also to the control surface of the control base with little production effort, and the control base can be coated on one or both sides with a hard material layer.

Gemäß einer vorteilhaften Weiterbildung der Erfindung liegt die Zylindertrommel mit einer Stirnfläche an der Steuerfläche des Steuerbodens an, wobei die Zylindertrommel aus Metall besteht und die Stirnfläche der Zylindertrommel ohne Beschichtung oder ohne Buntmetallschicht ausgeführt ist. Bei der erfindungsgemäßen Schrägachsenmaschine kann durch das Aufbringen der verschleißmindernden Hartstoffschicht an der Steuerfläche des Steuerbodens eine aufwändig durch einen Sintervorgang an der Stirnseite der Zylindertrommel aufgebrachte Buntmetallschicht entfallen, so dass eine weitere Verringerung der Herstellkosten der erfindungsgemäßen Schrägachsenmaschine erzielbar ist.According to an advantageous development of the invention, the cylinder drum rests with an end face on the control surface of the control base, the cylinder drum being made of metal and the end face of the cylinder drum being designed without a coating or without a layer of non-ferrous metal. In the bent-axis machine according to the invention, the application of the wear-reducing hard material layer on the control surface of the control base means that a non-ferrous metal layer that is laboriously applied by a sintering process on the front side of the cylinder drum can be omitted, so that a further reduction in the manufacturing costs of the bent-axis machine according to the invention can be achieved.

Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in den schematischen Figuren dargestellten Ausführungsbeispiels näher erläutert. Hierbei zeigt

Figur 1
eine erfindungsgemäße Axialkolbenmaschine in Schrägachsenbauweise einem Längsschnitt,
Figur 2
den Steuerboden und die Steuerbodenaufnahme des Gehäuses der Figur 1 in einer vergrößerten Darstellung und
Figur 3
den Steuerboden und die Zylindertrommel der Figur 1 in einer vergrößerten Darstellung.
Further advantages and details of the invention are explained in more detail with reference to the exemplary embodiment illustrated in the schematic figures. Here shows
figure 1
an axial piston machine according to the invention in a bent-axis design a longitudinal section,
figure 2
the control base and the control base receptacle of the housing figure 1 in an enlarged view and
figure 3
the control floor and the cylinder drum of figure 1 in an enlarged view.

In der Figur 1 ist eine erfindungsgemäße hydrostatische Axialkolbenmaschine 1 in Schrägachsenbauweise, die als Verstellmaschine mit einem veränderbaren Verdrängervolumen ausgebildet ist, in einem Längsschnitt dargestellt.In the figure 1 1 shows a longitudinal section of a hydrostatic axial piston machine 1 according to the invention in a bent-axis design, which is designed as an adjusting machine with a variable displacement volume.

Die als Schrägachsenmaschine ausgebildete Axialkolbenmaschine 1 weist ein Gehäuse 2 auf, in dem eine mit einem Triebflansch 3 versehene Triebwelle 4 mittels einer Lagereinrichtung 5 um eine Rotationsachse 6 drehbar gelagert ist.The axial piston machine 1 designed as a bent-axis machine has a housing 2 in which a drive shaft 4 provided with a drive flange 3 is rotatably mounted about an axis of rotation 6 by means of a bearing device 5 .

Axial benachbart zu dem Triebflansch 6 ist eine um eine Rotationsachse 8 drehbar angeordnete Zylindertrommel 7 innerhalb des Gehäuses 2 angeordnet, die mit mehreren konzentrisch zu der Rotationsachse 8 der Zylindertrommel 7 angeordneten Kolbenausnehmungen 9 versehen ist, in denen jeweils ein Kolben 10 längsverschiebbar angeordnet ist.Arranged axially adjacent to the drive flange 6 is a cylinder drum 7 , which is rotatable about an axis of rotation 8 , within the housing 2 Piston recesses 9 is provided, in each of which a piston 10 is arranged to be longitudinally displaceable.

Die Kolben 10 sind jeweils mit dem Triebflansch 3 verbunden. Im dargestellten Ausführungsbeispiel ist hierzu jeweils eine Pleuelstange 11 vorgesehen. Die Pleuelstange 11 ist sowohl an dem zugeordneten Kolben 10 als auch an dem Triebflansch 3 jeweils mittels eines Kugelgelenks gelenkig gelagert.The pistons 10 are each connected to the drive flange 3 . In the illustrated embodiment, a connecting rod 11 is provided for this purpose. The connecting rod 11 is articulated both on the associated piston 10 and on the drive flange 3 by means of a ball joint.

Die Zylindertrommel 7 liegt mit einer Stirnseite 7a an einem mit einer Steuerfläche 16 versehenen Steuerboden 17 an. Zwischen der Steuerfläche 16 des Steuerbodens 17 und der Stirnseite 7a der Zylindertrommel 7 ist ein Gleitlager ausgebildet, wobei die Zylindertrommel 7 im Betrieb der Schrägachsenmaschine bei um die Rotationsachse 8 rotierender Zylindertrommel 7 mit der Stirnseite 7a an der Steuerfläche 16 des um die Rotationsachse 8 drehfest im Gehäuse 2 angeordneten Steuerbodens 17 entlangleitet.The cylinder drum 7 rests with an end face 7a on a control base 17 provided with a control surface 16 . A sliding bearing is formed between the control surface 16 of the control base 17 and the end face 7a of the cylinder drum 7, with the cylinder drum 7 being rotatably fixed about the rotational axis 8 with the end face 7a on the control surface 16 of the cylinder drum 7 during operation of the bent-axis machine when the cylinder drum 7 rotates about the rotational axis 8 Housing 2 arranged control base 17 passes along.

Im dargestellten Ausführungsbeispiel ist die Zylindertrommel 7 an einem mit dem Triebflansch 3 durch ein Kugelgelenk gelenkig verbundenen Tragzapfen 12 abgestützt, wobei an dem Tragzapfen 12 weiterhin eine Feder 18 abgestützt ist, die die Zylindertrommel 7 an die Steuerfläche 16 des Steuerbodens 17 anpresst. Der Tragzapfen 12 ist konzentrisch zur Rotationsachse 8 der Zylindertrommel 7 angeordnet.In the exemplary embodiment shown, the cylinder drum 7 is supported on a supporting pin 12 which is articulated to the drive flange 3 by a ball joint, with a spring 18 also being supported on the supporting pin 12, which presses the cylinder drum 7 against the control surface 16 of the control base 17. The supporting pin 12 is arranged concentrically to the axis of rotation 8 of the cylinder drum 7 .

In der Steuerfläche 16 des Steuerbodens 17 sind zur Steuerung der Zu- und Abfuhr von Druckmittel in den von den Kolbenausnehmungen 9 und den Kolben 10 gebildeten Verdrängerräumen nicht näher dargestellte nierenförmige Steuerausnehmungen ausgebildet, die einen Einlassanschluss 19 und einen Auslassanschluss 20 der Axialkolbenmaschine 1 bilden. Zur Verbindung der von den Kolbenausnehmungen 9 und den Kolben 10 gebildeten Verdrängerräumen mit den in dem Steuerboden 17 angeordneten Steuerausnehmungen ist die Zylindertrommel 7 an jeder Kolbenausnehmung 9 mit einer Steueröffnung 21 versehen.Kidney-shaped control recesses, not shown in detail, are formed in control surface 16 of control base 17 to control the supply and discharge of pressure medium in the displacement chambers formed by piston recesses 9 and piston 10, which form an inlet port 19 and an outlet port 20 of axial piston machine 1. To connect the displacement chambers formed by the piston recesses 9 and the pistons 10 to the control recesses arranged in the control base 17 , the cylinder drum 7 is provided with a control opening 21 at each piston recess 9 .

Die in der Figur 1 dargestellte Axialkolbenmaschine 1 ist als Verstellmaschine mit einem veränderbaren Verdrängervolumen ausgebildet. Bei der Verstellmaschine ist der Neigungswinkel der Rotationsachse 8 der Zylindertrommel 7 bezüglich der Rotationsachse 6 der Triebwelle 4 zur Veränderung des Verdrängervolumens verstellbar. Der mit der Steuerfläche 16 versehene Steuerboden 17 ist als Wiegenkörper ausgebildet, der in einer Steuerbodenaufnahme 2a des Gehäuses 2 um eine Schwenkachse S verschwenkbar angeordnet ist. Die Steuerbodenaufnahme 2a ist am Gehäuse 2 befestigt. Die Schwenkachse S des Steuerbodens 17 und somit der Zylindertrommel 7 liegt auf dem Schnittpunkt S der Rotationsachse 6 der Triebwelle 4 und der Rotationsachse 8 der Zylindertrommel 7 und ist senkrecht zu den Rotationsachsen 6 und 8.The one in the figure 1 The axial piston machine 1 shown is designed as an adjusting machine with a variable displacement volume. In the adjustment machine, the angle of inclination of the axis of rotation 8 of the cylinder drum 7 with respect to the axis of rotation 6 of the drive shaft 4 is used to change the displacement volume adjustable. The control base 17 provided with the control surface 16 is designed as a rocker body which is arranged in a control base receptacle 2a of the housing 2 such that it can pivot about a pivot axis S. The control base mount 2a is attached to the housing 2. The pivot axis S of the control base 17 and thus of the cylinder drum 7 lies on the intersection S of the axis of rotation 6 of the drive shaft 4 and the axis of rotation 8 of the cylinder drum 7 and is perpendicular to the axes of rotation 6 and 8.

Zur Verstellung der Neigung des Steuerbodens 17 und somit der Zylindertrommel 7 ist eine von einem Stellkolben 22 gebildete Stelleinrichtung vorgesehen, die mit dem Steuerboden 17 in Wirkverbindung steht. Der Stellkolben 22 ist hierzu mit dem Verbindungszapfen 23 versehen, der mit dem Steuerboden 17 gelenkig verbunden ist.In order to adjust the inclination of the control base 17 and thus of the cylinder drum 7 , an actuating device formed by an actuating piston 22 is provided, which is in operative connection with the control base 17 . For this purpose, the actuating piston 22 is provided with the connecting pin 23 which is connected to the control base 17 in an articulated manner.

Der Steuerboden 17 weist eine der Steuerfläche 16 gegenüberliegende Schwenkfläche 25 auf, mit der der Steuerboden 17 in einer Aufnahmefläche 26 der Steuerbodenaufnahme 2a des Gehäuses 2 angeordnet ist. Zwischen der Schwenkfläche 25 des Steuerbodens 17 und der Aufnahmefläche 26 der Steuerbodenaufnahme 2a ist ein Gleitlager ausgebildet, wobei der Steuerboden 17 beim Verschwenken des Steuerbodens 17 um die Schwenkachse S mit der Schwenkfläche 25 an der Aufnahmefläche 26 der Steuerbodenaufnahme 2a entlangleitet.The control base 17 has a pivot surface 25 which is opposite the control surface 16 and with which the control base 17 is arranged in a receiving surface 26 of the control base receptacle 2a of the housing 2 . A sliding bearing is formed between the pivoting surface 25 of the control base 17 and the receiving surface 26 of the control base receptacle 2a, with the control base 17 guiding along with the pivoting surface 25 on the retaining surface 26 of the control base receptacle 2a when the control base 17 is pivoted about the pivot axis S.

Die Schwenkfläche 25 des Steuerbodens 17 und die Aufnahmefläche 26 der Steuerbodenaufnahme 2a sind jeweils zylinderförmig ausgebildet, mit Radius um die Schwenkachse S.The pivoting surface 25 of the control base 17 and the receiving surface 26 of the control base receptacle 2a are each cylindrical, with a radius around the pivot axis S.

Wie in der Figur 2 näher verdeutlicht ist, in der die Steuerbodenaufnahme 2a und der Steuerboden 17 der erfindungsgemäßen Schrägachsenmaschine näher dargestellt ist, ist erfindungsgemäß auf der als Gleitfläche ausgebildeten Schwenkfläche 25 des Steuerbodens 17 eine verschleißmindernde Hartstoffschicht 30 aufgebracht. Die Hartstoffschicht 30 ist als kohlenstoffhaltige Hartstoffschicht oder als Chrom-Nitrid-Schicht ausgebildet, die in einem PVD-Verfahren (Physical-Vapor-Deposition) auf die zylinderförmige Schwenkfläche 25 des Steuerbodens 17 aufgebracht ist. Bei der erfindungsgemäßen Schrägachsenmaschine besteht die Steuerbodenaufnahme 2a aus Metall oder Guss und die Aufnahmefläche 26 der Steuerbodenaufnahme 2a weist keine Oberflächenhärtung auf. Die erfindungsgemäße Beschichtung der Schwenkfläche 25 des Steuerbodens 17, die die Lauffläche bei der Schwenkbewegung des Steuerbodens 17 um die Schwenkachse S bildet, mit der verschleißmindernden Hartstoffschicht 30 ist kostengünstig herstellbar und es kann auf eine aufwändige Wärmebehandlung und auf einen aufwändigen Härtevorgang, beispielsweise einen Nitriervorgang, der größeren Aufnahmefläche 26 der Steuerbodenaufnahme 2a verzichtet werden.Like in the figure 2 is illustrated in more detail, in which the control base receptacle 2a and the control base 17 of the bent-axis machine according to the invention is shown in more detail, a wear-reducing hard material layer 30 is applied to the pivot surface 25 of the control base 17 designed as a sliding surface. The hard material layer 30 is designed as a carbon-containing hard material layer or as a chromium nitride layer, which is applied to the cylindrical pivoting surface 25 of the control base 17 using a PVD method (physical vapor deposition). In the bent-axis machine according to the invention, the control base mount 2a is made of metal or cast iron and the mounting surface 26 of the control base mount 2a has no surface hardening. The coating of the pivoting surface 25 of the control base 17 according to the invention, which forms the running surface during the pivoting movement of the control base 17 about the pivot axis S, with the wear-reducing hard material layer 30 can be produced inexpensively and it can be a complex heat treatment and a complex hardening process, such as a nitriding process, the larger recording surface 26 of the control base recording 2a are dispensed with.

Wie in der Figur 3 näher verdeutlicht ist, in der der Steuerboden 17 und die Zylindertrommel 7 der erfindungsgemäßen Schrägachsenmaschine näher dargestellt ist, kann bei der erfindungsgemäßen Schrägachsenmaschine zusätzlich auf der Steuerfläche 16 des Steuerbodens 17 eine verschleißmindernde Hartstoffschicht 31 aufgebracht werden. Die Hartstoffschicht 31 ist als kohlenstoffhaltige Hartstoffschicht oder als Chrom-Nitrid-Schicht ausgebildet, die in einem PVD-Verfahren (Physical-Vapor-Deposition) auf die Steuerfläche 16 des Steuerbodens 17 aufgebracht ist. Bei der erfindungsgemäßen Schrägachsenmaschine besteht die Zylindertrommel 7 aus Metall und die Stirnfläche 7a der Zylindertrommel 7 ist ohne Beschichtung bzw. ohne Buntmetallschicht ausgeführt. Die Beschichtung der Steuerfläche 16 des Steuerbodens 17 mit der verschleißmindernden Hartstoffschicht 31 ist kostengünstig herstellbar und es kann auf eine aufgesinterte Buntmetallschicht an der Stirnseite 7a der Zylindertrommel 7, die aufwändig durch einen Sintervorgang aufzubringen ist, verzichtet werden.Like in the figure 3 is illustrated in more detail, in which the control base 17 and the cylinder drum 7 of the bent-axis machine according to the invention is shown in more detail, a wear-reducing hard material layer 31 can also be applied to the control surface 16 of the control base 17 in the bent-axis machine according to the invention. The hard material layer 31 is formed as a carbon-containing hard material layer or as a chromium nitride layer, which is applied to the control surface 16 of the control base 17 using a PVD method (physical vapor deposition). In the bent-axis machine according to the invention, the cylinder drum 7 is made of metal and the end face 7a of the cylinder drum 7 is designed without a coating or without a layer of non-ferrous metal. The coating of the control surface 16 of the control base 17 with the wear-reducing hard material layer 31 can be produced inexpensively and a sintered non-ferrous metal layer on the end face 7a of the cylinder drum 7, which is laboriously applied by a sintering process, can be dispensed with.

Claims (6)

  1. Hydrostatic axial piston machine (1) of bent axis design, having a drive shaft (4) which is arranged so as to be rotatable about an axis of rotation (6) and which is provided with a drive flange (3), and having a cylinder drum (7) which is arranged so as to be rotatable about an axis of rotation (8), wherein the cylinder drum (7) is provided with a plurality of piston recesses (9) which are arranged concentrically with respect to the axis of rotation (8) of the cylinder drum (7) and in which in each case one piston (10) which is connected to the drive flange (3) is arranged in longitudinally displaceable fashion, wherein the cylinder drum (7) lies on a control bottom (17) which is provided with a control surface (16), and wherein the axial piston machine (1) is configured as a variable displacement machine with a variable displacement volume, wherein the control bottom (17) is arranged with a pivoting surface (25), which is opposite the control surface (16), in a control bottom receptacle (2a) of the housing (2) so as to be pivotable about a pivot axis (S), wherein a plain bearing is formed between the pivoting surface (25) of the control bottom (17) and the control bottom receptacle (2a) of the housing (2), characterized in that a wear-reducing hard material layer (30) is applied to the pivoting surface (25) of the control bottom (17), wherein a receiving surface (26) of the control bottom receptacle (2a) receives the pivoting surface (25) of the control bottom (17), wherein the control bottom receptacle (2a) is composed of metal or cast iron, and the receiving surface (26) of the control bottom receptacle (2a) does not have any surface hardening.
  2. Hydrostatic axial piston machine according to Claim 1, characterized in that a wear-reducing hard material layer (31) is applied to the control surface (16) of the control bottom (17).
  3. Hydrostatic axial piston machine according to Claim 1 or 2, characterized in that the hard material layer (30; 31) is configured as a carbon-containing layer.
  4. Hydrostatic axial piston machine according to Claim 1 or 2, characterized in that the hard material layer (30; 31) is configured as a chromium nitride layer.
  5. Hydrostatic axial piston machine according to one of Claims 1 to 4, characterized in that the hard material layer (30; 31) is applied in a PVD process.
  6. Hydrostatic axial piston machine according to one of Claims 1 to 5, characterized in that the cylinder drum (7) lies with an end surface (7a) on the control surface (16) of the control bottom (17), wherein the cylinder drum (7) is composed of metal and the end surface (7a) of the cylinder drum (7) is formed without a coating or without a nonferrous metal layer.
EP16167902.2A 2015-05-11 2016-05-02 Hydrostatic axial piston machine with inclined axes Active EP3093489B1 (en)

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DE102019202483A1 (en) * 2019-02-25 2020-08-27 Robert Bosch Gmbh Axial piston machine with one-piece counting perforation
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JP3923298B2 (en) * 2001-11-05 2007-05-30 ボッシュ・レックスロス株式会社 Swash plate hydraulic pump
DE10347086A1 (en) * 2003-06-11 2005-01-05 Brueninghaus Hydromatik Gmbh Axial piston machine with offset positioning and control disc for such an axial piston machine
DE502004003059D1 (en) * 2003-06-11 2007-04-12 Brueninghaus Hydromatik Gmbh AXIAL PISTON MACHINE WITH PLACED POSITIONING ELEMENT AND CONTROL PANE FOR SUCH AN AXIAL PISTON MACHINE
DE102004033321B4 (en) * 2004-07-09 2006-03-30 Brueninghaus Hydromatik Gmbh Axial piston machine with wear protection layer
CN201007261Y (en) * 2007-02-01 2008-01-16 北京华德液压工业集团有限责任公司技术中心 Axial Variable displacement plunger pump
DE102009013887A1 (en) * 2009-03-19 2010-09-23 Linde Material Handling Gmbh Hydrostatic displacement body machine has cylindrical drum that is provided with piston clearance, where displacement body machine is provided with form-fit suppression unit
JP5616384B2 (en) * 2012-03-08 2014-10-29 日立建機株式会社 Oblique shaft type hydraulic rotating machine and manufacturing method of oblique axis type hydraulic rotating machine
CN103184990B (en) * 2013-03-14 2015-04-29 北京工业大学 Oblique plunger type pure water hydraulic swash plate pump
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