EP3309392B1 - Method for producing a sliding block of a hydrostatic displacement machine - Google Patents

Method for producing a sliding block of a hydrostatic displacement machine Download PDF

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Publication number
EP3309392B1
EP3309392B1 EP17193761.8A EP17193761A EP3309392B1 EP 3309392 B1 EP3309392 B1 EP 3309392B1 EP 17193761 A EP17193761 A EP 17193761A EP 3309392 B1 EP3309392 B1 EP 3309392B1
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EP
European Patent Office
Prior art keywords
sliding shoe
component
sliding
ball joint
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
EP17193761.8A
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German (de)
French (fr)
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EP3309392A1 (en
Inventor
Lukas Krittian
Thomas LÖFFLER
Rolf Lasaar
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 EP3309392A1 publication Critical patent/EP3309392A1/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
    • F04B1/2035—Cylinder barrels
    • 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
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • F04B1/126—Piston shoe retaining means
    • 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

Definitions

  • the invention relates to a method for producing a sliding shoe of a hydrostatic displacement machine, in particular an axial piston machine, which can be articulated to a pressurized piston and supports the piston on a stroke-generating running surface, the sliding shoe consisting of a ball joint head with which the sliding shoe is articulated to the piston is, a sliding shoe plate with which the sliding shoe is supported on the running surface, and a sliding shoe neck, which is formed between the ball joint head and the sliding shoe plate.
  • Hydrostatic displacement machines in particular axial piston machines, have a sliding bearing point in the region of the support of the pistons on a running surface that generates a stroke.
  • the pistons are supported on a running surface that generates a stroke using sliding shoes as support elements.
  • the sliding shoes are each articulated to the pressurized piston by means of a ball joint. Due to the high pressing forces resulting from the application of pressure to the pistons, hydrostatic relief can also be formed at the sliding bearing point between the sliding shoes and the running surface.
  • Known sliding shoes consist of a ball joint head with which the sliding shoe is attached to the piston in an articulated manner, a sliding shoe plate with which the sliding shoe is supported on the running surface and on which the tribologically favorable layer can be applied, and a sliding shoe neck between the ball joint head and the Slide shoe plate is formed.
  • the ball joint head, the sliding shoe neck and the sliding shoe plate are formed from a one-piece steel body.
  • the sliding shoes consist of a solid material. If necessary, a tribologically favorable material can be joined to the steel body on the end face of the slide shoe plate.
  • Such sliding blocks which are made of solid material and are therefore one-piece, lead to high inertial forces when the displacement machine is in operation with a rotating cylinder drum in which the pistons with the sliding blocks are arranged to be longitudinally displaceable. Due to the high inertia forces, high centrifugal forces occur on the sliding shoes at higher speeds of the cylinder drum when the displacement machine is in operation, which can lead to the sliding shoes tipping off the running surface. Tipping the sliding shoes off the running surface can damage the displacement machine.
  • the inertial forces of the sliding shoes can be reduced if the sliding shoe is made of a material with a lower density and lower strength, for example aluminum.
  • a sliding shoe made of aluminum leads to a lower power density of the displacement machine, since the pistons can only be subjected to lower pressures.
  • the DE 10 2012 108 014 A1 discloses a hydrostatic displacement unit in which the pistons are supported on a stroke-generating running surface by means of sliding shoes which are hingedly attached to the pistons.
  • the sliding shoes are designed as hollow bodies to reduce the inertia forces and centrifugal forces.
  • the sliding shoe designed as a hollow body can also be made in several parts and the components of the sliding shoe can be welded to one another, for example by means of electron beam welding, laser welding or friction welding.
  • the EP 1 262 269 A1 discloses joining two components of a vehicle frame, which have a large axial overlap area, by means of magnetic pulse welding by energizing several coils one after the other.
  • the present invention is based on the object of providing a method for producing a sliding shoe of the type mentioned at the outset, with which a sliding shoe can be produced with little manufacturing effort which has low inertia forces at high speeds.
  • the sliding shoe is formed from several components of different densities, the components being connected to form the sliding shoe by magnetic pulse welding.
  • the sliding shoe which consists of the ball joint head, the sliding shoe plate and the sliding shoe neck, is formed by several and thus at least two components which have different densities.
  • the components and thus materials of different densities are welded to form a sliding shoe by magnetic pulse welding. With magnetic pulse forming, a magnetic pulse is generated, through whose energy input components and thus materials of different densities can be welded together with little manufacturing effort.
  • Magnetic pulse welding of several components of different densities to form a sliding shoe makes it possible to manufacture a lightweight sliding shoe with little manufacturing effort, on which only low inertia and centrifugal forces act at high speeds.
  • the sliding shoe according to the invention the inertial forces acting on the sliding shoe at high speeds are reduced, whereby the running of the sliding shoes according to the invention on the running surface can be improved and tilting of the sliding shoes from the running surface can be prevented.
  • the sliding shoe is formed from a first component, on which the ball joint head is formed, and from a second component, on which the sliding shoe neck and the sliding shoe plate are formed, wherein the first component and the second component are connected to the sliding shoe by magnetic pulse welding and thus welded.
  • the sliding shoe is formed from a first component on which the ball joint head and the sliding shoe neck are formed, and from a second component on which the sliding shoe plate is formed, the first component and the second component through Magnetic pulse welding connected to the slide shoe and thus welded.
  • the second component can, according to an advantageous embodiment of the invention, be formed as a circular plate or as an annular disc.
  • the first component consists of a material of higher strength, in particular steel
  • the second component consists of a material of lower strength, in particular brass or aluminum.
  • the first component which is provided with the ball joint head and consists of a material of higher strength
  • a high level of strength is achieved on the ball joint between the piston and sliding shoe, so that the pistons can be subjected to high pressures and thus a high power density of the displacement machine is achieved can be.
  • the second component which consists of a material with lower strength and lower density, it is possible to reduce the inertia forces acting on the sliding shoe at high speeds of the displacement machine.
  • a hydrostatic displacement machine 1 with sliding shoes 6 of the prior art is shown in a longitudinal section.
  • the illustrated embodiment shows an axial piston machine with a swash plate design as an example of a hydrostatic displacement machine 1.
  • the displacement machine 1 has a cylinder drum 3 rotatably mounted about an axis of rotation 2, which is provided with several piston recesses 4 arranged concentrically to the axis of rotation 2, which are preferably formed by cylinder bores and in each of which a piston 5 is longitudinally displaceable.
  • the pistons 5 are supported in the area protruding from the cylinder drum 3 by means of a sliding shoe 6 as a support element on a stroke-generating running surface 7, which is formed by a swash plate 8 arranged in a rotationally fixed manner about the axis of rotation 2.
  • the swash plate 8 can be attached to a housing 9 of the displacement machine 1 - as in FIG Figure 1 is shown - be integrally formed or non-rotatably attached, the displacement machine 1 having a fixed displacement volume.
  • the cylinder drum 3 is supported in the axial direction of the displacement machine 1 opposite the running surface 7 on a housing-side distributor 10, which forms a control surface 11.
  • the control surface 11 is provided with kidney-shaped control recesses which enable an inlet channel 14 and an outlet channel 13 in the housing 9 to be connected to the piston recesses 4.
  • the distributor 10 can be formed by a disk-shaped component which is fastened in a rotationally fixed manner to the housing 9, for example a housing cover 9a of the housing 9.
  • the distributor 10 can be integrally formed on the housing 9, for example a housing cover 9a of the housing 9, so that the function of the control surface 11 is integrated into the housing 9, 9a.
  • control surface 11 can as in the Figure 1 shown be flat or spherical.
  • the cylinder drum 3 is penetrated by a central bore through which a drive shaft 15 arranged concentrically to the axis of rotation 2 passes through the cylinder drum 3 is led.
  • the drive shaft 15 is rotatably mounted in the housing 9, 9a by means of bearings 16, 17.
  • the cylinder drum 3 is non-rotatably connected to the drive shaft 15 by means of driving teeth 18, but is axially displaceable. Also shown is a pressure spring 19 which presses and supports the cylinder drum 3 in the axial direction on the control surface 11.
  • the sliding shoes 6 are connected in an articulated manner to the respective piston 5 by means of a sliding shoe joint designed as a ball joint 25.
  • the ball joint 25 between the piston 5 and the sliding block 6 consists of a ball 26 and a dome 27.
  • the ball 26 is fastened in the dome 27, for example, by a positive connection in which an edge area of the dome 27 is deformed around the ball 26 to enclose form-fitting.
  • the sliding shoes 6 consist of a ball joint head 6a with which the sliding shoe 6 is articulated to the piston 5, a sliding shoe plate 6b with which the sliding shoe 6 is supported on the running surface 7, and a sliding shoe neck 6c, which is located between the ball joint head 6a and the Slide shoe plate 6b is formed.
  • the ball joint head 6a, the sliding shoe neck 6c and the sliding shoe plate 6b are formed from a one-piece steel body, so that the sliding shoe 6 consists of a solid material.
  • the sliding shoes 6 and the running surface 7 form a sliding bearing point at which a relative movement occurs between the sliding shoes 6 rotating with the cylinder drum 3 and the piston 5 and the running surface 7 that is non-rotatably attached to the housing 9.
  • a bearing metal layer 28 for example a brass plate, can be joined as a tribologically favorable bearing metal material to the end face of the sliding shoe plate 6b facing the running surface 7.
  • the sliding shoes 6 on the running surface 7 are hydrostatically relieved.
  • the hold-down device 20 is designed as a hold-down disk which interacts with contact surfaces on the slide shoe 6.
  • the sliding shoes 6 according to the invention in the Figures 2 to 4 are formed by several components B1, B2, of different densities in the illustrated exemplary embodiments, which are connected by magnetic pulse welding to form the sliding block 6 and are thus welded.
  • the components B1, B2 are welded to one another by weld seams SW by means of magnetic pulse welding.
  • the ball joint head 6a is formed on the first component B1 and the slide shoe neck 6c and the slide shoe plate 6b are formed on the second component B2.
  • the two components B1, B2 are connected to one another to form the sliding shoe 6 with a weld SW, which is arranged on the facing end faces between the ball joint head 6a and the sliding shoe neck 6c.
  • the ball joint head 6a and the sliding shoe neck 6c are formed on the first component B1 and the sliding shoe plate 6b is formed on the second component B2.
  • the second component B2 is designed as a circular plate 30.
  • the two components B1, B2 are connected to one another to form the sliding shoe 6 with a weld SW, which is arranged on the facing end faces between the sliding shoe neck 6c and the sliding shoe plate 6b designed as a circular plate 30.
  • the second component B2 is designed as an annular disc 31 which is provided with a bore 32 into which the first component B1 with the pin-shaped sliding shoe neck 6c can be inserted.
  • the two components B1, B2 with a weld seam SW, which between the outer surface of the sliding shoe neck 6c and the inner wall of the Bore 32 of the slide shoe plate 6b designed as an annular disk 31 is arranged, connected to one another to form the slide shoe 6.
  • the first component B1 consists of a material of higher strength, for example steel, and the second component B2 of a material with lower strength, for example brass or aluminum.
  • the ball joint head 6a of the sliding blocks 6 is designed as a ball 26 of the ball joint 25.
  • the spherical cap 27 of the ball joint 25 is then as in FIG Figure 1 shown, arranged on the piston 5.
  • the invention is not limited to this arrangement of the ball 26 and spherical cap 27.
  • the ball joint head 6 a of the sliding shoes 6 can be designed as a spherical cap 27 of the ball joint 25.
  • the ball 26 of the ball joint 25 is then arranged on the piston 5.
  • a contact surface 35 for a hold-down device 20 is also formed in each case.
  • the first component B1 on which the ball joint head 6a is arranged consists of a material of higher strength and higher density
  • high strength is achieved at the ball joint 25 between piston 5 and sliding shoe 6, see above that the pistons 5 can be subjected to high pressures and thus a high power density of the displacement machine 1 can be achieved.
  • the second component B2 consists of a material with lower strength and lower density
  • the running of the sliding shoes 6 on the running surface 7 can be improved and the risk of the sliding shoes 6 tipping over from the running surface 7 can be reduced.
  • the components B1, B2 of different strengths and different densities can be made into sliding shoes 6 with little manufacturing effort are welded, so that bimetallic and lightweight sliding shoes 6 according to the invention can be produced with little manufacturing effort.
  • the two components B1, B2 are inserted into an annular coil in the area of the joint, on which a magnetic field (electromagnetic pulse) is generated during magnetic pulse welding.
  • a magnetic field electromagnettic pulse
  • the weld seam SW is produced between the two components B1, B2.
  • Sliding shoes 6 produced according to the invention can also be used in axial piston machines of bent axis design or in radial piston machines.

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

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Gleitschuhs einer hydrostatischen Verdrängermaschine, insbesondere einer Axialkolbenmaschine, der an einem druckbeaufschlagten Kolben gelenkig befestigbar ist und den Kolben an einer huberzeugenden Lauffläche abstützt, wobei der Gleitschuh aus einem Kugelgelenkkopf, mit dem der Gleitschuh an dem Kolben gelenkig befestigt ist, einer Gleitschuhplatte, mit der der Gleitschuh an der Lauffläche abgestützt ist, und einem Gleitschuhhals besteht, der zwischen dem Kugelgelenkkopf und der Gleitschuhplatte ausgebildet ist.The invention relates to a method for producing a sliding shoe of a hydrostatic displacement machine, in particular an axial piston machine, which can be articulated to a pressurized piston and supports the piston on a stroke-generating running surface, the sliding shoe consisting of a ball joint head with which the sliding shoe is articulated to the piston is, a sliding shoe plate with which the sliding shoe is supported on the running surface, and a sliding shoe neck, which is formed between the ball joint head and the sliding shoe plate.

Hydrostatische Verdrängermaschinen, insbesondere Axialkolbenmaschinen, weisen im Bereich der Abstützung der Kolben an einer huberzeugenden Lauffläche eine Gleitlagerstelle auf. Diese Abstützung der Kolben an einer huberzeugenden Lauffläche erfolgt über Gleitschuhe als Abstützelemente. Die Gleitschuhe sind an den druckbeaufschlagten Kolben jeweils mittels eines Kugelgelenks gelenkig befestigt. Aufgrund der hohen anpressenden und aus der Druckbeaufschlagung der Kolben resultierenden Kräfte kann zusätzlich eine hydrostatische Entlastung an der Gleitlagerstelle zwischen den Gleitschuhen und der Lauffläche ausgebildet sein. Um die Gleiteigenschaften des Gleitschuhs bei der Relativbewegung an der drehfesten Lauffläche zu verbessern und einen geringen Verschleiß zu erzielen, vor allem in einer Anlaufphase bis zum Aufbau einer hydrostatischen Entlastung, ist es bereits bekannt, an den Stirnflächen der Gleitschuhe, mit denen der entsprechende Gleitschuh an der Lauffläche als Gegenpart abgestützt ist, eine tribologisch günstige Schicht vorzusehen, die mit dem Werkstoff der Lauffläche eine für die Gleiteigenschaften günstige Paarung bildet.Hydrostatic displacement machines, in particular axial piston machines, have a sliding bearing point in the region of the support of the pistons on a running surface that generates a stroke. The pistons are supported on a running surface that generates a stroke using sliding shoes as support elements. The sliding shoes are each articulated to the pressurized piston by means of a ball joint. Due to the high pressing forces resulting from the application of pressure to the pistons, hydrostatic relief can also be formed at the sliding bearing point between the sliding shoes and the running surface. In order to improve the sliding properties of the sliding shoe during the relative movement on the non-rotatable running surface and to achieve low wear, especially in a start-up phase until the build-up of hydrostatic relief, it is already known that the end faces of the sliding shoes with which the corresponding sliding shoe is attached the running surface is supported as a counterpart to provide a tribologically favorable layer which forms a pairing which is favorable for the sliding properties with the material of the running surface.

Bekannte Gleitschuhe bestehen aus einem Kugelgelenkkopf, mit dem der Gleitschuh an dem Kolben gelenkig befestigt ist, einer Gleitschuhplatte, mit der der Gleitschuh an der Lauffläche abgestützt ist und an der die tribologisch günstige Schicht aufgebracht sein kann, und einem Gleitschuhhals, der zwischen dem Kugelgelenkkopf und der Gleitschuhplatte ausgebildet ist. Bei bekannten Gleitschuhen ist der Kugelgelenkkopf, der Gleitschuhhals und die Gleitschuhplatte von einem einteiligen Stahlkörper gebildet. Die Gleitschuhe bestehen somit aus einem Vollmaterial. Sofern erforderlich, kann an der Stirnseite der Gleitschuhplatte noch ein tribologisch günstiges Material auf den Stahlkörper gefügt werden.Known sliding shoes consist of a ball joint head with which the sliding shoe is attached to the piston in an articulated manner, a sliding shoe plate with which the sliding shoe is supported on the running surface and on which the tribologically favorable layer can be applied, and a sliding shoe neck between the ball joint head and the Slide shoe plate is formed. In known sliding shoes, the ball joint head, the sliding shoe neck and the sliding shoe plate are formed from a one-piece steel body. The sliding shoes consist of a solid material. If necessary, a tribologically favorable material can be joined to the steel body on the end face of the slide shoe plate.

Derartige aus Vollmaterial bestehende und somit einteilige Gleitschuhe führen im Betrieb der Verdrängermaschine bei einer rotierenden Zylindertrommel, in der die Kolben mit den Gleitschuhen längsverschiebbar angeordnet sind, zu hohen Massenkräften. Aufgrund der hohen Massenkräfte treten an den Gleitschuhen bei höheren Drehzahlen der Zylindertrommel im Betrieb der Verdrängermaschine hohe Fliehkräfte auf, die zum Abkippen der Gleitschuhe von der Lauffläche führen können. Das Abkippen der Gleitschuhe von der Lauffläche kann zu Beschädigungen an der Verdrängermaschine führen. Die Massenkräfte der Gleitschuhe können verringert werden, wenn der Gleitschuh aus einem Material mit geringerer Dichte und geringerer Festigkeit hergestellt wird, beispielsweise Aluminium. Da jedoch an dem Kugelgelenk zwischen Kolben und Gleitschuh aufgrund der Kräfte an den druckbeaufschlagten Kolben hohe Belastungen auftreten, führt ein aus Aluminium hergestellter Gleitschuh zu einer geringeren Leistungsdichte der Verdrängermaschine, da die Kolben nur von geringeren Drücken beaufschlagt werden können.Such sliding blocks, which are made of solid material and are therefore one-piece, lead to high inertial forces when the displacement machine is in operation with a rotating cylinder drum in which the pistons with the sliding blocks are arranged to be longitudinally displaceable. Due to the high inertia forces, high centrifugal forces occur on the sliding shoes at higher speeds of the cylinder drum when the displacement machine is in operation, which can lead to the sliding shoes tipping off the running surface. Tipping the sliding shoes off the running surface can damage the displacement machine. The inertial forces of the sliding shoes can be reduced if the sliding shoe is made of a material with a lower density and lower strength, for example aluminum. However, since high loads occur on the ball joint between the piston and sliding shoe due to the forces on the pressurized piston, a sliding shoe made of aluminum leads to a lower power density of the displacement machine, since the pistons can only be subjected to lower pressures.

Die DE 10 2012 108 014 A1 offenbart eine hydrostatische Verdrängereinheit, bei der die Kolben mittels Gleitschuhen, die an den Kolben gelenkig befestigt sind, an einer huberzeugenden Lauffläche abgestützt sind. Die Gleitschuhe sind zur Verringerung der Massenkräfte und Fliehkräfte als Hohlkörper ausgebildeten. Gemäß der Figur 10 kann der als Hohlkörper ausgebildete Gleitschuh auch mehrteilig ausgeführt sein und die Bauteile des Gleitschuhs können miteinander verschweißt werden, beispielsweise durch Elektrodenstrahlschweißen, Laserschweißen oder Reibschweißen.the DE 10 2012 108 014 A1 discloses a hydrostatic displacement unit in which the pistons are supported on a stroke-generating running surface by means of sliding shoes which are hingedly attached to the pistons. The sliding shoes are designed as hollow bodies to reduce the inertia forces and centrifugal forces. According to FIG. 10, the sliding shoe designed as a hollow body can also be made in several parts and the components of the sliding shoe can be welded to one another, for example by means of electron beam welding, laser welding or friction welding.

Aus der DE 103 06 792 A1 ist ein mehrteiliger Hohlkolben für eine Axialkolbenverdichter einer Fahrzeugklimaanlage bekannt, bei dem die Kolbenteile mittels Magnetpulsschweißen verschweißt werden.From the DE 103 06 792 A1 a multi-part hollow piston for an axial piston compressor of a vehicle air conditioning system is known, in which the piston parts are welded by means of magnetic pulse welding.

Die EP 1 262 269 A1 offenbart, zwei Komponenten eines Fahrzeugrahmens, die einen großen axialen Überlappungsbereich aufweisen, mittels Magnetpulsschweißen zu verbinden, indem mehrere Spulen nacheinander bestromt werden.the EP 1 262 269 A1 discloses joining two components of a vehicle frame, which have a large axial overlap area, by means of magnetic pulse welding by energizing several coils one after the other.

Aus der DE 10 2008 012 761 A1 ist es bekannt, Wälzlagerbauteil (Innenring oder Außenring) einer Wälzlagerung aus zwei Elementen herzustellen, die mit Magnetpulsschweißen verbunden werdenFrom the DE 10 2008 012 761 A1 it is known to produce rolling bearing component (inner ring or outer ring) of a rolling bearing from two elements that are connected by magnetic pulse welding

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung eines Gleitschuhs der eingangs genannten Gattung zur Verfügung zu stellen, mit dem bei geringem Herstellaufwand ein Gleitschuh hergestellt werden kann, der bei hohen Drehzahlen geringe Massenkräfte aufweist.The present invention is based on the object of providing a method for producing a sliding shoe of the type mentioned at the outset, with which a sliding shoe can be produced with little manufacturing effort which has low inertia forces at high speeds.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Gleitschuh von mehreren Bauteilen unterschiedlicher Dichte gebildet wird, wobei die Bauteile durch Magnetpulsschweißen zu dem Gleitschuh verbunden werden. Erfindungsgemäß wird somit der Gleitschuh, der aus dem Kugelgelenkkopf, der Gleitschuhplatte und dem Gleitschuhhals besteht, von mehreren und somit mindestens zwei Bauteilen gebildet, die unterschiedliche Dichte aufweisen. Die Bauteile und somit Materialen unterschiedlicher Dichte werden erfindungsgemäß durch Magnetpulsschweißen zu einem Gleitschuh verschweißt. Beim Magnetpulsumformen wird ein magnetischer Puls erzeugt, durch dessen Energieeintrag Bauteile und somit Materialen unterschiedlicher Dichte mit geringem Herstellaufwand miteinander verschweißt werden können. Durch das Magnetpulsschweißen mehrerer Bauteile unterschiedlicher Dichte zu einem Gleitschuh wird es ermöglicht, einen leichten Gleitschuh, auf den bei hohen Drehzahlen nur geringe Massenkräfte und Fliehkräfte wirken, mit geringem Herstellaufwand herzustellen. Bei dem erfindungsgemäßen Gleitschuh werden die bei hohen Drehzahlen auf den Gleitschuh wirkenden Massenkräfte verringert, wodurch der Lauf der erfindungsgemäßen Gleitschuhe auf der Lauffläche verbessert werden kann und ein Abkippen der Gleitschuhe von der Lauffläche verhindert werden kann.According to the invention, this object is achieved in that the sliding shoe is formed from several components of different densities, the components being connected to form the sliding shoe by magnetic pulse welding. According to the invention, the sliding shoe, which consists of the ball joint head, the sliding shoe plate and the sliding shoe neck, is formed by several and thus at least two components which have different densities. According to the invention, the components and thus materials of different densities are welded to form a sliding shoe by magnetic pulse welding. With magnetic pulse forming, a magnetic pulse is generated, through whose energy input components and thus materials of different densities can be welded together with little manufacturing effort. Magnetic pulse welding of several components of different densities to form a sliding shoe makes it possible to manufacture a lightweight sliding shoe with little manufacturing effort, on which only low inertia and centrifugal forces act at high speeds. In the sliding shoe according to the invention, the inertial forces acting on the sliding shoe at high speeds are reduced, whereby the running of the sliding shoes according to the invention on the running surface can be improved and tilting of the sliding shoes from the running surface can be prevented.

Gemäß einer vorteilhaften Ausführungsform der Erfindung wird der Gleitschuh aus einem ersten Bauteil, an dem der Kugelgelenkkopf ausgebildet ist, und aus einem zweiten Bauteil gebildet, an dem der Gleitschuhhals und die Gleitschuhplatte ausgebildet sind, wobei das erste Bauteil und das zweite Bauteil durch Magnetpulsschweißen zu dem Gleitschuh verbunden und somit verschweißt werden.According to an advantageous embodiment of the invention, the sliding shoe is formed from a first component, on which the ball joint head is formed, and from a second component, on which the sliding shoe neck and the sliding shoe plate are formed, wherein the first component and the second component are connected to the sliding shoe by magnetic pulse welding and thus welded.

Gemäß einer alternativen und ebenfalls vorteilhaften Ausführungsform der Erfindung wird der Gleitschuh aus einem ersten Bauteil, an dem der Kugelgelenkkopf und der Gleitschuhhals ausgebildet sind, und aus einem zweiten Bauteil gebildet, an dem die Gleitschuhplatte ausgebildet ist, wobei das erste Bauteil und das zweite Bauteil durch Magnetpulsschweißen zu dem Gleitschuh verbunden und somit verschweißt werden.According to an alternative and also advantageous embodiment of the invention, the sliding shoe is formed from a first component on which the ball joint head and the sliding shoe neck are formed, and from a second component on which the sliding shoe plate is formed, the first component and the second component through Magnetic pulse welding connected to the slide shoe and thus welded.

Bei einem derartigen Gleitschuh, bei dem an dem zweiten Bauteil nur die Gleitschuhplatte ausgebildet ist, kann das zweite Bauteil gemäß einer vorteilhaften Ausgestaltungsform der Erfindung als kreisförmige Platte oder als ringförmige Scheibe ausgebildet sein.In such a sliding shoe, in which only the sliding shoe plate is formed on the second component, the second component can, according to an advantageous embodiment of the invention, be formed as a circular plate or as an annular disc.

Gemäß einer vorteilhaften Ausgestaltungsform bestehen das erste Bauteil aus einem Material höherer Festigkeit, insbesondere Stahl, und das zweite Bauteil aus einem Material mit niedrigerer Festigkeit, insbesondere Messing oder Aluminium. An dem ersten Bauteil, das mit dem Kugelgelenkkopf versehen ist und aus einem Material höherer Festigkeit besteht, wird an dem Kugelgelenk zwischen Kolben und Gleitschuh eine hohe Festigkeit erzielt, so dass die Kolben von hohen Drücken beaufschlagt werden können und somit eine hohe Leistungsdichte der Verdrängermaschine erzielt werden kann. Mit dem zweiten Bauteil, das aus einem Material mit niedrigerer Festigkeit und niedrigerer Dichte besteht, wird es ermöglicht, die auf den Gleitschuh bei hohen Drehzahlen der Verdrängermaschine wirkenden Massenkräfte zu verringern.According to an advantageous embodiment, the first component consists of a material of higher strength, in particular steel, and the second component consists of a material of lower strength, in particular brass or aluminum. On the first component, which is provided with the ball joint head and consists of a material of higher strength, a high level of strength is achieved on the ball joint between the piston and sliding shoe, so that the pistons can be subjected to high pressures and thus a high power density of the displacement machine is achieved can be. With the second component, which consists of a material with lower strength and lower density, it is possible to reduce the inertia forces acting on the sliding shoe at high speeds of the displacement machine.

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

Figur 1
eine hydrostatisches Verdrängermaschine des Standes der Technik in einem Längsschnitt,
Figur 2
eine erste Ausführungsform eines erfindungsgemäß hergestellten Gleitschuhs,
Figur 3
eine zweite Ausführungsform eines erfindungsgemäß hergestellten Gleitschuhs und
Figur 4
eine dritte Ausführungsform eines erfindungsgemäß hergestellten Gleitschuhs.
Further advantages and details of the invention are explained in more detail with reference to the exemplary embodiments shown in the schematic figures. Here shows
Figure 1
a hydrostatic displacement machine of the prior art in a longitudinal section,
Figure 2
a first embodiment of a sliding shoe produced according to the invention,
Figure 3
a second embodiment of a sliding shoe produced according to the invention and
Figure 4
a third embodiment of a sliding shoe produced according to the invention.

In der Figur 1 ist eine hydrostatische Verdrängermaschine 1 mit Gleitschuhen 6 des Standes der Technik in einem Längsschnitt dargestellt. Das dargestellte Ausführungsbeispiel zeigt eine Axialkolbenmaschine in Schrägscheibenbauweise als Beispiel einer hydrostatischen Verdrängermaschine 1.In the Figure 1 a hydrostatic displacement machine 1 with sliding shoes 6 of the prior art is shown in a longitudinal section. The illustrated embodiment shows an axial piston machine with a swash plate design as an example of a hydrostatic displacement machine 1.

Die Verdrängermaschine 1 weist eine um eine Drehachse 2 drehbar gelagerte Zylindertrommel 3 auf, die mit mehreren konzentrisch zur Drehachse 2 angeordneten Kolbenausnehmungen 4 versehen ist, die bevorzugt von Zylinderbohrungen gebildet sind und in denen jeweils ein Kolben 5 längsverschiebbar gelagert ist.The displacement machine 1 has a cylinder drum 3 rotatably mounted about an axis of rotation 2, which is provided with several piston recesses 4 arranged concentrically to the axis of rotation 2, which are preferably formed by cylinder bores and in each of which a piston 5 is longitudinally displaceable.

Die Kolben 5 stützen sich in dem aus der Zylindertrommel 3 herausragenden Bereich mittels jeweils eines Gleitschuhs 6 als Abstützelements auf einer huberzeugenden Lauffläche 7 ab, die von einer um die Drehachse 2 drehfest angeordneten Schrägscheibe 8 gebildet ist.The pistons 5 are supported in the area protruding from the cylinder drum 3 by means of a sliding shoe 6 as a support element on a stroke-generating running surface 7, which is formed by a swash plate 8 arranged in a rotationally fixed manner about the axis of rotation 2.

Die Schrägscheibe 8 kann an einem Gehäuse 9 der Verdrängermaschine 1 - wie in der Figur 1 dargestellt ist - angeformt oder drehfest befestigt sein, wobei die Verdrängermaschine 1 ein festes Verdrängungsvolumen aufweist.The swash plate 8 can be attached to a housing 9 of the displacement machine 1 - as in FIG Figure 1 is shown - be integrally formed or non-rotatably attached, the displacement machine 1 having a fixed displacement volume.

Es ist alternativ möglich, die Schrägscheibe 8 in der Neigung verstellbar anzuordnen, wodurch die Verdrängermaschine 1 ein veränderbares Verdrängungsvolumen aufweist.Alternatively, it is possible to arrange the inclination of the swash plate 8 so that it can be adjusted, so that the displacement machine 1 has a variable displacement volume.

Die Zylindertrommel 3 stützt sich in axialer Richtung der Verdrängermaschine 1 gegenüberliegend zu der Lauffläche 7 an einem gehäuseseitigen Verteiler 10 ab, der eine Steuerfläche 11 bildet. Die Steuerfläche 11 ist mit nierenförmigen Steuerausnehmungen versehen, die die Verbindung eines Einlasskanals 14 und eines Auslasskanals 13 im Gehäuse 9 mit den Kolbenausnehmungen 4 ermöglichen.The cylinder drum 3 is supported in the axial direction of the displacement machine 1 opposite the running surface 7 on a housing-side distributor 10, which forms a control surface 11. The control surface 11 is provided with kidney-shaped control recesses which enable an inlet channel 14 and an outlet channel 13 in the housing 9 to be connected to the piston recesses 4.

Der Verteiler 10 kann von einem scheibenförmigen Bauteil gebildet werden, das an dem Gehäuse 9, beispielsweise einem Gehäusedeckel 9a des Gehäuses 9, drehfest befestigt ist. Alternativ kann der Verteiler 10 an dem Gehäuse 9, beispielsweise einem Gehäusedeckel 9a des Gehäuses 9 einstückig angeformt werden, so dass die Funktion der Steuerfläche 11 in das Gehäuse 9, 9a integriert ist.The distributor 10 can be formed by a disk-shaped component which is fastened in a rotationally fixed manner to the housing 9, for example a housing cover 9a of the housing 9. Alternatively, the distributor 10 can be integrally formed on the housing 9, for example a housing cover 9a of the housing 9, so that the function of the control surface 11 is integrated into the housing 9, 9a.

Die Steuerfläche 11 kann wie in der Figur 1 dargestellt eben oder auch sphärisch sein.The control surface 11 can as in the Figure 1 shown be flat or spherical.

Die Zylindertrommel 3 ist von einer zentrischen Bohrung durchsetzt, durch die eine konzentrisch zur Drehachse 2 angeordnete Triebwelle 15 durch die Zylindertrommel 3 geführt ist. Die Triebwelle 15 ist mittels Lagerungen 16, 17 im Gehäuse 9, 9a drehbar gelagert.The cylinder drum 3 is penetrated by a central bore through which a drive shaft 15 arranged concentrically to the axis of rotation 2 passes through the cylinder drum 3 is led. The drive shaft 15 is rotatably mounted in the housing 9, 9a by means of bearings 16, 17.

Die Zylindertrommel 3 ist mittels einer Mitnahmeverzahnung 18 mit der Triebwelle 15 drehfest, jedoch axial verschiebbar verbunden. Weiterhin dargestellt ist eine Anpressfeder 19, die die Zylindertrommel 3 in axialer Richtung an die Steuerfläche 11 anpresst und abstützt.The cylinder drum 3 is non-rotatably connected to the drive shaft 15 by means of driving teeth 18, but is axially displaceable. Also shown is a pressure spring 19 which presses and supports the cylinder drum 3 in the axial direction on the control surface 11.

Die Gleitschuhe 6 sind mittels eines als Kugelgelenk 25 ausgebildeten Gleitschuhgelenks mit dem jeweiligen Kolben 5 gelenkig verbunden.The sliding shoes 6 are connected in an articulated manner to the respective piston 5 by means of a sliding shoe joint designed as a ball joint 25.

Das Kugelgelenk 25 zwischen dem Kolben 5 und dem Gleitschuh 6 besteht aus einer Kugel 26 und einer Kalotte 27. Die Befestigung der Kugel 26 in der Kalotte 27 erfolgt beispielsweise durch eine formschlüssige Verbindung, in dem ein Randbereich der Kalotte 27 verformt wird, um die Kugel 26 formschlüssig zu umschließen.The ball joint 25 between the piston 5 and the sliding block 6 consists of a ball 26 and a dome 27. The ball 26 is fastened in the dome 27, for example, by a positive connection in which an edge area of the dome 27 is deformed around the ball 26 to enclose form-fitting.

Die Gleitschuhe 6 bestehen aus einem Kugelgelenkkopf 6a, mit dem der Gleitschuh 6 an dem Kolben 5 gelenkig befestigt ist, einer Gleitschuhplatte 6b, mit der der Gleitschuh 6 an der Lauffläche 7 abgestützt ist, und einem Gleitschuhhals 6c, der zwischen dem Kugelgelenkkopf 6a und der Gleitschuhplatte 6b ausgebildet ist. Bei bekannten Gleitschuhen 6 des Standes der Technik ist der Kugelgelenkkopf 6a, der Gleitschuhhals 6c und die Gleitschuhplatte 6b von einem einteiligen Stahlkörper gebildet, so dass der Gleitschuh 6 aus einem Vollmaterial besteht.The sliding shoes 6 consist of a ball joint head 6a with which the sliding shoe 6 is articulated to the piston 5, a sliding shoe plate 6b with which the sliding shoe 6 is supported on the running surface 7, and a sliding shoe neck 6c, which is located between the ball joint head 6a and the Slide shoe plate 6b is formed. In known sliding shoes 6 of the prior art, the ball joint head 6a, the sliding shoe neck 6c and the sliding shoe plate 6b are formed from a one-piece steel body, so that the sliding shoe 6 consists of a solid material.

Im Betrieb der Verdrängermaschine 1 bei rotierender Zylindertrommel 3 bilden die Gleitschuhe 6 und die Lauffläche 7 eine Gleitlagerstelle, an der zwischen den mit der Zylindertrommel 3 und den Kolben 5 mitrotierenden Gleitschuhen 6 und der drehfest am Gehäuse 9 befestigten Lauffläche 7 eine Relativbewegung auftritt. Zur Verringerung der Reibung und des Verschleißes kann an der der Lauffläche 7 zugewandten Stirnseite der Gleitschuhplatte 6b jeweils eine Lagermetallschicht 28, beispielsweise eine Messingplatte, als tribologisch günstiger Lagermetallwerkstoff gefügt werden. Zusätzlich sind die Gleitschuhe 6 an der Lauffläche 7 hydrostatisch entlastet.When the displacement machine 1 is in operation with the cylinder drum 3 rotating, the sliding shoes 6 and the running surface 7 form a sliding bearing point at which a relative movement occurs between the sliding shoes 6 rotating with the cylinder drum 3 and the piston 5 and the running surface 7 that is non-rotatably attached to the housing 9. To reduce friction and wear, a bearing metal layer 28, for example a brass plate, can be joined as a tribologically favorable bearing metal material to the end face of the sliding shoe plate 6b facing the running surface 7. In addition, the sliding shoes 6 on the running surface 7 are hydrostatically relieved.

Ein Abheben und/oder Abkippen der Gleitschuhe 6 von der Lauffläche 7 wird durch eine Niederhaltevorrichtung 20 vermieden. Die Niederhaltevorrichtung 20 ist im dargestellten Ausführungsbeispiel als Niederhaltescheibe ausgebildet, die mit Anlageflächen an dem Gleitschuh 6 zusammenwirkt.Lifting off and / or tilting of the sliding blocks 6 from the running surface 7 is avoided by a hold-down device 20. In the exemplary embodiment shown, the hold-down device 20 is designed as a hold-down disk which interacts with contact surfaces on the slide shoe 6.

In den Figuren 2 bis 4 sind erfindungsgemäße Gleitschuhe 6 dargestellt.In the Figures 2 to 4 slide shoes 6 according to the invention are shown.

Die erfindungsgemäßen Gleitschuhe 6 in den Figuren 2 bis 4 sind von mehreren, in den dargestellten Ausführungsbeispielen von jeweils zwei Bauteilen B1, B2, unterschiedlicher Dichte gebildet, die durch Magnetpulsschweißen zu dem Gleitschuh 6 verbunden und somit verschweißt werden. Durch Magnetpulsschweißen werden die Bauteile B1, B2 durch Schweißnähte SW miteinander verschweißt.The sliding shoes 6 according to the invention in the Figures 2 to 4 are formed by several components B1, B2, of different densities in the illustrated exemplary embodiments, which are connected by magnetic pulse welding to form the sliding block 6 and are thus welded. The components B1, B2 are welded to one another by weld seams SW by means of magnetic pulse welding.

In dem Ausführungsbeispiel der Figur 2 ist an dem ersten Bauteil B1 der Kugelgelenkkopf 6a ausgebildet und sind an dem zweiten Bauteil B2 der Gleitschuhhals 6c und die Gleitschuhplatte 6b ausgebildet. Durch das Magnetpulsschweißen werden die beiden Bauteile B1, B2 mit einer Schweißnaht SW, die an den zugewandten Stirnseiten zwischen dem Kugelgelenkkopf 6a und dem Gleitschuhhals 6c angeordnet ist, miteinander zu dem Gleitschuh 6 verbunden.In the embodiment of Figure 2 the ball joint head 6a is formed on the first component B1 and the slide shoe neck 6c and the slide shoe plate 6b are formed on the second component B2. By means of the magnetic pulse welding, the two components B1, B2 are connected to one another to form the sliding shoe 6 with a weld SW, which is arranged on the facing end faces between the ball joint head 6a and the sliding shoe neck 6c.

In den Ausführungsbeispielen der Figuren 3 und 4 sind an dem ersten Bauteil B1 der Kugelgelenkkopf 6a und der Gleitschuhhals 6c ausgebildet und ist an dem zweiten Bauteil B2 die Gleitschuhplatte 6b ausgebildet.In the embodiments of Figures 3 and 4 the ball joint head 6a and the sliding shoe neck 6c are formed on the first component B1 and the sliding shoe plate 6b is formed on the second component B2.

In dem Ausführungsbeispiel der Figur 4 ist das zweite Bauteil B2 als kreisförmige Platte 30 ausgebildet. Durch das Magnetpulsschweißen werden die beiden Bauteile B1, B2 mit einer Schweißnaht SW, die an den zugewandten Stirnseiten zwischen dem Gleitschuhhals 6c und der als kreisförmige Platte 30 ausgebildeten Gleitschuhplatte 6b angeordnet ist, miteinander zu dem Gleitschuh 6 verbunden.In the embodiment of Figure 4 the second component B2 is designed as a circular plate 30. By means of magnetic pulse welding, the two components B1, B2 are connected to one another to form the sliding shoe 6 with a weld SW, which is arranged on the facing end faces between the sliding shoe neck 6c and the sliding shoe plate 6b designed as a circular plate 30.

In dem Ausführungsbeispiel der Figur 3 ist das zweite Bauteil B2 als ringförmige Scheibe 31 ausgebildet, die mit einer Bohrung 32 versehen ist, in die das erste Bauteil B1 mit dem zapfenförmigen Gleitschuhhals 6c eingeschoben werden kann. Durch das Magnetpulsschweißen werden die beiden Bauteile B1, B2 mit einer Schweißnaht SW, die zwischen der Mantelfläche des Gleitschuhhalses 6c und der Innenwand der Bohrung 32 der als ringförmige Scheibe 31 ausgebildeten Gleitschuhplatte 6b angeordnet ist, miteinander zu dem Gleitschuh 6 verbunden.In the embodiment of Figure 3 the second component B2 is designed as an annular disc 31 which is provided with a bore 32 into which the first component B1 with the pin-shaped sliding shoe neck 6c can be inserted. Through the magnetic pulse welding, the two components B1, B2 with a weld seam SW, which between the outer surface of the sliding shoe neck 6c and the inner wall of the Bore 32 of the slide shoe plate 6b designed as an annular disk 31 is arranged, connected to one another to form the slide shoe 6.

Bei den Gleitschuhen der Figuren 2 bis 4 besteht das erste Bauteil B1 aus einem Material höherer Festigkeit, beispielsweise Stahl, und das zweite Bauteil B2 aus einem Material mit niedrigerer Festigkeit, beispielsweise Messing oder Aluminium.With the sliding shoes of the Figures 2 to 4 the first component B1 consists of a material of higher strength, for example steel, and the second component B2 of a material with lower strength, for example brass or aluminum.

In den Figuren 2 bis 4 ist der Kugelgelenkkopf 6a der Gleitschuhe 6 als Kugel 26 des Kugelgelenks 25 ausgeführt. Die Kalotte 27 des Kugelgelenks 25 ist dann wie in der Figur 1 dargestellt, an dem Kolben 5 angeordnet. Die Erfindung ist jedoch nicht auf diese Anordnung der Kugel 26 und Kalotte 27 beschränkt. Alternativ kann der Kugelgelenkkopf 6a der Gleitschuhe 6 als Kalotte 27 des Kugelgelenks 25 ausgeführt sein. Die Kugel 26 des Kugelgelenks 25 ist dann an dem Kolben 5 angeordnet.In the Figures 2 to 4 the ball joint head 6a of the sliding blocks 6 is designed as a ball 26 of the ball joint 25. The spherical cap 27 of the ball joint 25 is then as in FIG Figure 1 shown, arranged on the piston 5. However, the invention is not limited to this arrangement of the ball 26 and spherical cap 27. Alternatively, the ball joint head 6 a of the sliding shoes 6 can be designed as a spherical cap 27 of the ball joint 25. The ball 26 of the ball joint 25 is then arranged on the piston 5.

An den zweiten Bauteilen B2, an denen die Gleitschuhplatte 6b ausgebildet ist, ist in den Ausführungsbeispielen der Figuren 2 bis 4 weiterhin jeweils eine Anlagefläche 35 für eine Niederhaltevorrichtung 20 ausgebildet.On the second components B2, on which the slide shoe plate 6b is formed, is in the exemplary embodiments Figures 2 to 4 a contact surface 35 for a hold-down device 20 is also formed in each case.

Bei den erfindungsgemäßen, bimetallischen Gleitschuhen 6, bei denen das erste Bauteil B1, an dem der Kugelgelenkkopf 6a angeordnet ist, aus einem Material höherer Festigkeit und höherer Dichte besteht, wird an dem Kugelgelenk 25 zwischen Kolben 5 und Gleitschuh 6 eine hohe Festigkeit erzielt, so dass die Kolben 5 von hohen Drücken beaufschlagt werden können und somit eine hohe Leistungsdichte der Verdrängermaschine 1 erzielt werden kann. Bei den erfindungsgemäßen, bimetallischen Gleitschuhe 6, bei denen das zweiten Bauteil B2 aus einem Material mit niedrigerer Festigkeit und niedrigerer Dichte besteht, wird es ermöglicht, die auf den Gleitschuh 6 bei hohen Drehzahlen der Verdrängermaschine 1 wirkenden Massenkräfte zu verringern. Durch die verringerten Massenkräfte an den erfindungsgemäßen Gleitschuhen 6 kann der Lauf der Gleitschuhe 6 an der Lauffläche 7 verbessert werden und die Gefahr des Abkippens der Gleitschuhe 6 von der Lauffläche 7 verringert werden.In the case of the bimetallic sliding shoes 6 according to the invention, in which the first component B1, on which the ball joint head 6a is arranged, consists of a material of higher strength and higher density, high strength is achieved at the ball joint 25 between piston 5 and sliding shoe 6, see above that the pistons 5 can be subjected to high pressures and thus a high power density of the displacement machine 1 can be achieved. With the bimetallic sliding shoes 6 according to the invention, in which the second component B2 consists of a material with lower strength and lower density, it is possible to reduce the inertia forces acting on the sliding shoe 6 at high speeds of the displacement machine 1. As a result of the reduced inertia forces on the sliding shoes 6 according to the invention, the running of the sliding shoes 6 on the running surface 7 can be improved and the risk of the sliding shoes 6 tipping over from the running surface 7 can be reduced.

Durch Magnetpulsschweißen können die Bauteile B1, B2 unterschiedlicher Festigkeit und unterschiedlicher Dichte mit geringem Herstellaufwand zu Gleitschuhen 6 verschweißt werden, so dass erfindungsgemäße bimetallische und leichte Gleitschuhe 6 mit geringem Herstellaufwand hergestellt werden können.By means of magnetic pulse welding, the components B1, B2 of different strengths and different densities can be made into sliding shoes 6 with little manufacturing effort are welded, so that bimetallic and lightweight sliding shoes 6 according to the invention can be produced with little manufacturing effort.

Die beiden Bauteile B1, B2 werden hierzu im Bereich der Fügestelle in eine ringförmige Spule eingeführt, an der beim Magnetpulsschweißen ein Magnetfeld (elektromagnetischer Puls) erzeugt wird. Durch Aufbringen des Magnetfeldes beim Magnetpulsumformen wird die Schweißnaht SW zwischen den beiden Bauteilen B1, B2 erzeugt.For this purpose, the two components B1, B2 are inserted into an annular coil in the area of the joint, on which a magnetic field (electromagnetic pulse) is generated during magnetic pulse welding. By applying the magnetic field during magnetic pulse forming, the weld seam SW is produced between the two components B1, B2.

Erfindungsgemäß hergestellte Gleitschuhe 6 können ebenfalls bei Axialkolbenmaschine in Schrägachsenbauweise oder bei Radialkolbenmaschinen Verwendung finden.Sliding shoes 6 produced according to the invention can also be used in axial piston machines of bent axis design or in radial piston machines.

Claims (5)

  1. Method for producing a sliding shoe (6) of a hydrostatic positive-displacement machine (1), in particular of an axial piston machine, which can be fastened to a pressure-loaded piston (5) in an articulated manner and supports the piston (5) on a stroke-generating running surface (7), wherein the sliding shoe (6) consists of a ball joint head (6a), with which the sliding shoe (6) is fastened to the piston (5) in an articulated manner, a sliding shoe plate (6b), with which the sliding shoe (6) is supported on the running surface (7), and a sliding shoe neck (6c), which is configured between the ball joint head (6a) and the sliding shoe plate (6b), characterized in that the sliding shoe (6) is formed by a plurality of components (B1, B2) of differing density, wherein these components (B1, B2) are connected to form the sliding shoe (6) by magnetic pulse welding.
  2. Method according to Claim 1, characterized in that the sliding shoe (6) is formed from a first component (B1), on which the ball joint head (6a) is configured, and from a second component (B2), on which the sliding shoe neck (6c) and the sliding shoe plate (6b) are configured, wherein the first component (B1) and the second component (B2) are connected to form the sliding shoe (6) by magnetic pulse welding.
  3. Method according to Claim 1, characterized in that the sliding shoe (6) is formed from a first component (B1), on which the ball joint head (6a) and the sliding shoe neck (6c) are configured, and from a second component (B2), on which the sliding shoe plate (6b) is configured, wherein the first component (B1) and the second component (B2) are connected to form the sliding shoe (6) by magnetic pulse welding.
  4. Method according to Claim 3, characterized in that the second component (B2) is configured as a circular plate (30) or as a ring-shaped disc (31).
  5. Method according to one of Claims 1 to 4, characterized in that the first component (B1) consists of a material of higher strength, in particular steel, and the second component (B2) consists of a material of lower strength, in particular brass or aluminium.
EP17193761.8A 2016-10-12 2017-09-28 Method for producing a sliding block of a hydrostatic displacement machine Active EP3309392B1 (en)

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CH716310B1 (en) * 2019-06-12 2023-03-15 Urben & Kyburz Ag Component for a piston engine and method for manufacturing the component.

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IL149873A0 (en) * 2001-05-31 2002-11-10 Dana Corp Method for performing a magnetic pulse welding operation
DE10306792B4 (en) * 2003-01-23 2007-03-22 Valeo Compressor Europe Gmbh Piston, in particular for an axial piston compressor, and method for producing the same
DE102008012761B4 (en) * 2008-03-05 2016-07-07 Ab Skf Component of a rolling bearing and Verfehren for producing the device
DE102012108014A1 (en) * 2012-08-30 2014-03-06 Linde Hydraulics Gmbh & Co. Kg Sliding shoe for hydrostatic axial piston machine, has central tube portion that is surrounded by cavity extending from the ball joint to pressure pocket

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