EP0011145B1 - Sliding shoe for hydrostatic piston machines - Google Patents

Sliding shoe for hydrostatic piston machines Download PDF

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Publication number
EP0011145B1
EP0011145B1 EP79103993A EP79103993A EP0011145B1 EP 0011145 B1 EP0011145 B1 EP 0011145B1 EP 79103993 A EP79103993 A EP 79103993A EP 79103993 A EP79103993 A EP 79103993A EP 0011145 B1 EP0011145 B1 EP 0011145B1
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EP
European Patent Office
Prior art keywords
slide
annular groove
sole
lying
annular
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Expired
Application number
EP79103993A
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German (de)
French (fr)
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EP0011145A1 (en
Inventor
Gerhard Dipl.-Ing. Nonnenmacher
Karl Ing. Veil (Grad.)
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0011145A1 publication Critical patent/EP0011145A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B1/00—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements
    • F01B1/06—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders in star or fan arrangement
    • F01B1/0641—Details, component parts specially adapted for such machines
    • F01B1/0644—Pistons
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons

Definitions

  • the invention is based on a slide shoe for hydrostatic piston machines according to the preamble of claim 1.
  • the annular grooves in such a known slide shoe have a rectangular cross section, i.e. all groove flanks run parallel to the longitudinal axis of the slide shoe. This creates sharp-edged transitions that can adversely affect the oil-lubricating film between the shoe sole and its support surface (lifting ring, swash plate) (DE-A-1 936 431).
  • a sliding shoe has become known, on the sliding sole of which hydrostatic pressure fields of various surface shapes are formed, e.g. circular, oval, rectangular.
  • the pressure fields run through grooves on the sliding sole that run transversely to the direction of travel of the sliding block and have the task of distinguishing the hydrostatic from the hydrodynamic pressure fields.
  • These grooves also have a rectangular cross-sectional shape, so that what was stated at the beginning applies again (US Pat. No. 4,018,137).
  • the slide shoe according to the invention has the advantage that, with sufficient lubrication of the slide shoe sole, very good coordination of hydrodynamic and hydrostatic pressure fields is achieved. This makes the gliding properties of the glider particularly good
  • FIG. 1 shows a section through the sliding shoe with piston and cam ring
  • FIGS. 2 to 4 a first embodiment of the sliding sole
  • FIGS. 5 to 7 further exemplary embodiments.
  • the sliding shoe 1 to 4 has a shaft 2 with a spherical head 3 which is mounted in a spherical surface 4; this is formed on a stepped bore penetrating a piston 5 in the longitudinal direction.
  • the piston 5 is arranged in a cylinder bore 7 located in a cylinder body 8.
  • a snap ring 9 holds piston 5 and slide shoe 1 together.
  • the sliding shoe 1 lies with its curved sliding sole 13 on the inner sliding surface 14 of an annular guide member 15. This is arranged inside a housing, not shown. Details of the formation of the sliding sole 13 show the Flg. 2 to 7.
  • the sliding block has a longitudinal bore 17 for the inflow of pressure medium from the cylinder bore 7 to the sliding sole.
  • the sliding sole 13 of the sliding block has a rectangular shape, the movement taking place in the longitudinal direction of the sliding sole.
  • Two concentric annular grooves 18, 19 are formed on the sliding sole, of which the annular groove 18 lies completely within the sliding sole, while the annular groove 19 penetrates beyond the edge of the sliding sole 4, ring grooves 18 and 19 have a triangular shape in cross section. This has been discussed in more detail below.
  • the sliding sole has relatively large free fields 20, 21 on both sides of the annular groove 19.
  • Two parts of the annular groove 18 lying opposite one another are connected to one another by a flat longitudinal groove 22. This extends transversely to the longitudinal direction of the sliding sole and is connected to the bore 17, which lies in the center of the annular grooves 18, 19
  • the annular grooves 18, 19 which are triangular in cross section have a very specific shape.
  • the outer flank 18 'of the inner ring groove 18 and the inner flank 19' of the outer ring groove 19 run parallel to the longitudinal axis of the shaft of the sliding block.
  • the outer flank: 19 "of the outer ring groove 19 and the inner flank 18" of the inner ring groove 18 form a flat angle with the sliding sole.
  • the width of the sealing strip between the two ring grooves and thus the size of the relief field is independent of the groove depth.
  • This asymmetrical cross-sectional shape of the ring grooves has the least impact on the formation of the hydrodynamic pressure fields.
  • two concentric annular grooves 30, 31 are again provided. Their depth is chosen so small that, due to the curvature of the sliding sole, they emerge near the center of the sliding sole, i.e. they are interrupted in the course of the circumference.
  • the cross-sectional shape of the grooves is again as described above, ie triangular.
  • the diameter of the outer annular groove 31 is again substantially larger than the width of the sliding sole, so that it emerges laterally from the latter.
  • the sections of the annular groove 30 are in turn connected to one another at two opposite locations by the flat groove 22.
  • the ring grooves 30.31 - should actually be spoken of four ring groove branches - are produced together with the sliding block in one operation by turning. In this respect, the statement of two ring grooves is not to be misunderstood.
  • a hydrostatic pressure field builds up in the annular groove 30, which compensates for some of the pressure forces.
  • the hydrodynamic support zones building up over the two large surfaces 20, 21 are, since the annular grooves are not self-contained, shifted into the central region of the sliding sole and effect a substantial part of the relief.
  • the hydrostatic pressure field is essentially limited by the annular groove 30, its pressure drops towards the annular groove 31 to the pressure prevailing in the interior of the housing approximately linearly.
  • FIG. 5 shows a modification of the exemplary embodiment according to FIG. 6.
  • two annular grooves 31, 32 are in turn formed, and in contrast to the previous exemplary embodiment the annular groove 32 is now recessed so that it is self-contained.
  • This form of training defines the hydrostatic pressure field prevailing within the annular groove 32 even better.
  • the mode of operation is otherwise almost the same as described above.
  • the inner annular groove 34 is again designed as in the exemplary embodiment according to FIG. 5, while the outer annular groove 35 is now recessed so deeply that it has no interruption in the middle of the sliding sole.
  • the annular grooves including the bore 17 and the ball head 3 can be produced by turning and drilling operations in one clamping of the sliding block, as a result of which its manufacturing costs are very favorable.
  • the supply. of the hydrostatic pressure field via the flat groove 22 affects the build-up of hydrodynamic pressure fields only slightly.
  • the sliding shoe sole can also be flat, as is customary in axial piston machines.
  • the curved slide shoe on the other hand, is intended for radial piston machines. In the case of flat sliding soles, however, the production of the grooves is not so easy, since some of them have to be milled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Reciprocating Pumps (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Gleitschuh für hydrostatische Kolbenmaschinen nach der Gattung des Patentanspruchs 1. Die Ringnuten bei einem derartigen bekannten Gleitschuh haben rechteckförmigen Querschnitt, d.h., alle Nutflanken verlaufen parallel zur Längsachse des Gleitschuhs. Hierdurch entstehen scharfkantige Übergänge, die den Öl-Schmierfilm zwischen Gleitschuhsohle und dessen Abstützfläche (Hubring, Schrägscheibe) in nachteiliger Weise beeinträchtigen können (DE-A-1 936 431).The invention is based on a slide shoe for hydrostatic piston machines according to the preamble of claim 1. The annular grooves in such a known slide shoe have a rectangular cross section, i.e. all groove flanks run parallel to the longitudinal axis of the slide shoe. This creates sharp-edged transitions that can adversely affect the oil-lubricating film between the shoe sole and its support surface (lifting ring, swash plate) (DE-A-1 936 431).

Um zu vermeiden, dass durch scharfe Kanten der Ölfilm zwischen zwei aufeinander gleitenden Teilen abgeschabt wird, ist es bekannt, den längsverlaufenden Nuten an Gleitschuhen trapez- oder drefeckförmigen Querschnitt zu geben, wobei diese Querschnitte symmetrisch ausgebildet sind (Dubbei, "Taschenbuch für den Maschinenbau», 13. Auflage; Neudruck 1974, Seite 718 und 719). Bei konzentrischen Ringnuten hat dies den Nachtell, dass der Steg zwischen dafesen und damit die Fläche des hydrodynamischen Traganteils in unerwünschter Weise verkleinert wird.In order to prevent the oil film between two sliding parts from being scraped off by sharp edges, it is known to give the longitudinal grooves on slide shoes a trapezoidal or triangular cross section, these cross sections being symmetrical (Dubbei, "paperback for mechanical engineering» , 13th edition; reprint 1974, pages 718 and 719). In the case of concentric annular grooves, this has the disadvantage that the web between them and thus the area of the hydrodynamic load-bearing portion is undesirably reduced.

Weiterhin ist ein Gleitschuh bekanntgeworden, an dessen Gleitsohle hydrostatische Druckfeider verschiedener Flächenformen ausgebildet sind, z.B. kreisförmige, ovale, rechteckige. Teilweise verlaufen quer zur Laufrichtung des Gleitschuhs seldich der Druckfelder durchgehende Nuten an der Gleitsohle, die die Aufgabe haben, die hydrostatischen von den hydrodynamischen Druckfeldern abzugfenzen. Auch diese Nuten haben eine rechteckige Querschnittsform, so dass wiederum das eingangs Ausgeführte gilt (US-A-4 018137).Furthermore, a sliding shoe has become known, on the sliding sole of which hydrostatic pressure fields of various surface shapes are formed, e.g. circular, oval, rectangular. In some cases, the pressure fields run through grooves on the sliding sole that run transversely to the direction of travel of the sliding block and have the task of distinguishing the hydrostatic from the hydrodynamic pressure fields. These grooves also have a rectangular cross-sectional shape, so that what was stated at the beginning applies again (US Pat. No. 4,018,137).

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemässe Gleitschuh mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass bei ausreichend guter Schmierung der Gleitschuhsohle eine sehr gute Abstimmung hydrodynamischer und hydrostatischer Druckfelder erreicht wird. Dadurch werden die Gleiteigenschaften des Gleitschuhs besonders gutThe slide shoe according to the invention, with the characterizing features of the main claim, has the advantage that, with sufficient lubrication of the slide shoe sole, very good coordination of hydrodynamic and hydrostatic pressure fields is achieved. This makes the gliding properties of the glider particularly good

Durch die in den Unteransprüchen aufgeführten Massnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale möglich.The measures listed in the subclaims permit advantageous developments and improvements of the features specified in the main claim.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Fig. 1 einen Schnitt durch den Gleitschuh mit Kolben und Hubring, Fig. 2 bis 4 ein erstes Ausführungsbeispiel der Gleitsohle, Fig. 5 bis 7 weitere Ausführungsbeispieie.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a section through the sliding shoe with piston and cam ring, FIGS. 2 to 4 a first embodiment of the sliding sole, FIGS. 5 to 7 further exemplary embodiments.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Der Gleitschuh 1 nach dem Ausführungsbeispiei der Fig. 1 bis 4 besitzt einen Schaft 2 mit einem Kugelkopf 3, der in einer Kugelfläche 4 gelagert ist; dieser ist an einer einen Kolben 5 in Längsrichtung durchdringenden Stufenbohrung ausgebildet Der Kolben 5 ist in einer in einem Zylinderkörper 8 befindlichen Zylinderbohrung 7 angeordnet. Ein Sprengring 9 hält Kolben 5 und Gleitschuh 1 zusammen. Oberhalb des Kugetkopfes 3 befindet sich ein zylindrischer Abschnitt 10 der Stufenbohrung 6, die mit einem als Drosselstelle 12 ausgebildeten Längsabschnitt der Stufenbohrung zusammenwirkt Der Gieitschuh 1 liegt mit seiner gewölbten Gleitsohle 13 auf der inneren Gleitfläche 14 eines ringförmigen Führungsglieds 15 auf. Dieses ist im Inneren eines nicht dargestellten Gehäuses angeordnet. Einzelheiten der Ausbildung der Gleitsohle 13 zeigen die Flg. 2 bis 7. Der Gleitschuh hat eine Längsbohrung 17 für den Zufluss von Druckmitteln aus der Zylinderbohrung 7 zur Gleitsohle.1 to 4 has a shaft 2 with a spherical head 3 which is mounted in a spherical surface 4; this is formed on a stepped bore penetrating a piston 5 in the longitudinal direction. The piston 5 is arranged in a cylinder bore 7 located in a cylinder body 8. A snap ring 9 holds piston 5 and slide shoe 1 together. Above the ball head 3 there is a cylindrical section 10 of the stepped bore 6, which cooperates with a longitudinal section of the stepped bore designed as a throttle point 12. The sliding shoe 1 lies with its curved sliding sole 13 on the inner sliding surface 14 of an annular guide member 15. This is arranged inside a housing, not shown. Details of the formation of the sliding sole 13 show the Flg. 2 to 7. The sliding block has a longitudinal bore 17 for the inflow of pressure medium from the cylinder bore 7 to the sliding sole.

Die Gleitsohle 13 des Gleitschuhs hat Rechteckform, wobei die Bewegung in Längsrichtung der Gleitsohle erfolgt An der Gleitsohle sind zwei konzentrische Ringnuten 18, 19 ausgebildet, von denen die Ringnut 18 vollständig innerhalb der Gleitsohle liegt, während die Ringnut 19 über den Rand der Gleitsohle hinausdringt Die Ringnuten 18 und 19 haben, wie die Fig. 4 besonders deutlich zeigt, im Querschnitt Dreieckform. Hierauf ist weiter unten noch näher eingegangen. Beidseits der Ringnut 19 verfügt die Gleitsohle über relativ groese freie Felder 20, 21. Zwei einander gegenüberliegende Steilen der Ringnut 18 sind durch eine flache Längsnut 22 miteinander verbunden. Diese verläuft quer zur Längsrichtung der Gleitsohle und steht mit der Bohrung 17 in Verbindung, die im Zentrum der Ringnuten 18, 19 liegtThe sliding sole 13 of the sliding block has a rectangular shape, the movement taking place in the longitudinal direction of the sliding sole. Two concentric annular grooves 18, 19 are formed on the sliding sole, of which the annular groove 18 lies completely within the sliding sole, while the annular groove 19 penetrates beyond the edge of the sliding sole 4, ring grooves 18 and 19 have a triangular shape in cross section. This has been discussed in more detail below. The sliding sole has relatively large free fields 20, 21 on both sides of the annular groove 19. Two parts of the annular groove 18 lying opposite one another are connected to one another by a flat longitudinal groove 22. This extends transversely to the longitudinal direction of the sliding sole and is connected to the bore 17, which lies in the center of the annular grooves 18, 19

im Betrieb der Kolbenmaschinen pflanzt sich der in der Zylinderbohrung herrschende Druck über die Bohrungen 12 und 17 sowie die flache Nut 22 in die innere Ringnut 18 fort. Dort baut sich ein hydrostatisches Druckfeld auf, das wesentlich zur Entlastung des Gleitschuhs beiträgt Auch über der Fläche 23 innerhalb der Ringnut 18 herrscht mindestens der hydrostatische Tragdruck. Über den freien Flächen 20, 21 bauen sich im Betrieb hydrodynamische Tragfeider auf, die ebenfalls zur Entlastung der Kolbenkräfte beitragen. Zwischen den Ringnuten 18, 19 fällt der hydrostatische Druck etwa linear auf den Gehäuseinnendruck (im allgemeinen atmosphärischer Druck) ab, da ja die Ringnut 19 aus der Gleitschuhsohle hinausläuft. Durch diese Ringnut wird das hydrostatische Druckfeld eindeutig begrenzt.during operation of the piston machines, the pressure prevailing in the cylinder bore propagates into the inner annular groove 18 via the bores 12 and 17 and the flat groove 22. A hydrostatic pressure field builds up there, which contributes significantly to relieving the pressure on the sliding block. At least the hydrostatic load pressure also prevails over the surface 23 within the annular groove 18. During operation, hydrodynamic support fields are built up over the free surfaces 20, 21, which likewise contribute to relieving the piston forces. Between the annular grooves 18, 19, the hydrostatic pressure drops approximately linearly to the internal pressure of the housing (generally atmospheric pressure), since the annular groove 19 runs out of the sole of the shoe. The hydrostatic pressure field is clearly limited by this annular groove.

Die schräge Ausbildung der Flanken der Ringnuten 18, 19 gegenüber der Längsachse des Gleitschuhs hat sich als besonders zweckmässig für den Aufbau von Druckfeldern erwiesen, da hierdurch scharfkantige Übergänge vermieden werden, wie es beispielsweise bei Ringnuten mit quadratischem oder rechteckigem Querschnitt der Fall ist.The oblique formation of the flanks of the annular grooves 18, 19 with respect to the longitudinal axis of the sliding block has proven to be particularly expedient for the construction of pressure fields, since this avoids sharp-edged transitions, as is the case, for example, with annular grooves with a square or rectangular cross section.

Wie die Fig. 4 zeigt, haben die im Querschnitt dreieckförmigen Ringnuten 18, 19 eine ganz bestimmte Form. So verläuft die äussere Flanke 18' der Inneren Ringnut 18 sowie die innere Flanke 19' der äusseren Ringnut 19 parallel zur Längsachse des Schaftes des Gleitschuhs. Die äussere Flanke: 19" der äusseren Ringnut 19 und die innere Flanke 18" der inneren Ringnut 18 bilden mit der Gleitsohle einen flachen Winkel. Bei dieser Form ist die Breite der Dichtleiste zwischen den beiden Ringnuten und damit die Grösse des Entlastungsfelds unabhängig von der Nuttiefe. Durch diese unsymmetrische Querschnittsform der Ringnuten wird die Ausbildung der hydrodynamischen Druckfelder am geringsten beeinträchtigt.As shown in FIG. 4, the annular grooves 18, 19 which are triangular in cross section have a very specific shape. Thus, the outer flank 18 'of the inner ring groove 18 and the inner flank 19' of the outer ring groove 19 run parallel to the longitudinal axis of the shaft of the sliding block. The outer flank: 19 "of the outer ring groove 19 and the inner flank 18" of the inner ring groove 18 form a flat angle with the sliding sole. In this form, the width of the sealing strip between the two ring grooves and thus the size of the relief field is independent of the groove depth. This asymmetrical cross-sectional shape of the ring grooves has the least impact on the formation of the hydrodynamic pressure fields.

Beim Ausführungsbeispiel nach der Fig. 5 sind wiederum zwei konzentrische Ringnuten 30, 31 vorgesehen. Deren Tiefe ist so gering gewählt, dass sie infolge der Wölbung der Gleitsohle nahe der Mitte der Gleitsohle austauchen, d.h. sie sind im Umfangsverlauf unterbrochen. Die Querschnittsform der Nuten ist wiederum so wie oben beschrieben, also dreieckförmig. Der Durchmesser der aussenliegenden Ringnut 31 ist auch wieder wesentlich grösser als die Breite der Gleitsohle, so dass sie seitlich aus dieser austaucht. Die Abschnitte der Ringnut 30 sind wiederum an zwei einander gegenüberliegenden Stellen durch die flache Nut 22 miteinander verbunden.In the embodiment according to FIG. 5, two concentric annular grooves 30, 31 are again provided. Their depth is chosen so small that, due to the curvature of the sliding sole, they emerge near the center of the sliding sole, i.e. they are interrupted in the course of the circumference. The cross-sectional shape of the grooves is again as described above, ie triangular. The diameter of the outer annular groove 31 is again substantially larger than the width of the sliding sole, so that it emerges laterally from the latter. The sections of the annular groove 30 are in turn connected to one another at two opposite locations by the flat groove 22.

Die Ringnuten 30,31 -strenggenommen müsste eigentlich von vier Ringnutästen gesprochen werden - werden zusammen mit dem Gleitschuh in einem Arbeitsgang durch Drehen hergestellt. Insofern ist die Aussage von zwei Ringnuten nicht misszuverstehen. In der Ringnut 30 baut sich im Betrieb wieder ein hydrostatisches Druckfeld auf, das einen Teil der Druckkräfte kompensiert. Die über den beiden grossen Flächen 20, 21 sich aufbauenden hydrodynamischen Tragzonen werden, da die Ringnuten nicht in sich geschlossen sind, bis in den Mittelbereich der Gleitsohle hinein verlagert und bewirken einen wesentlichen Teil der Entlastung. Das hydrostatische Druckfeld ist im wesentlichen begrenzt durch die Ringnut 30, sein Druck sinkt zur Ringnut 31 hin auf den im Innern des Gehäuses herrschenden Druck etwa linear ab.The ring grooves 30.31 - should actually be spoken of four ring groove branches - are produced together with the sliding block in one operation by turning. In this respect, the statement of two ring grooves is not to be misunderstood. In operation, a hydrostatic pressure field builds up in the annular groove 30, which compensates for some of the pressure forces. The hydrodynamic support zones building up over the two large surfaces 20, 21 are, since the annular grooves are not self-contained, shifted into the central region of the sliding sole and effect a substantial part of the relief. The hydrostatic pressure field is essentially limited by the annular groove 30, its pressure drops towards the annular groove 31 to the pressure prevailing in the interior of the housing approximately linearly.

Eine Abwandlung des. Ausführungsbeispiels nach Fig. 5 zeigt die Fig. 6. An deren Gleitsohle 13 sind wiederum zwei Ringnuten 31, 32 ausgebildet, wobei nunmehr im Gegensatz zum vorherigen Ausführungsbeispiel die Ringnut 32 tiefer eingestochen ist, so dass sie in sich geschlossen ist. Durch diese Ausbildungsform wird das innerhalb der Ringnut 32 herrschende hydrostatische Druckfeld noch besser definiert. Die Wirkungsweise ist ansonsten nahezu dieselbe wie oben beschrieben.5 shows a modification of the exemplary embodiment according to FIG. 6. On the sliding sole 13, two annular grooves 31, 32 are in turn formed, and in contrast to the previous exemplary embodiment the annular groove 32 is now recessed so that it is self-contained. This form of training defines the hydrostatic pressure field prevailing within the annular groove 32 even better. The mode of operation is otherwise almost the same as described above.

Beim Ausführungsbeispiel nach der Fig. 7 ist die innere Ringnut 34 wieder so ausgebildet, wie beim Ausführungsbeispiel nach der Fig. 5, während nunmehr die aussenliegende Ringnut 35 so tief eingestochen ist, dass sie in der Mitte der Gleitsohle keine Unterbrechung aufweist.In the exemplary embodiment according to FIG. 7, the inner annular groove 34 is again designed as in the exemplary embodiment according to FIG. 5, while the outer annular groove 35 is now recessed so deeply that it has no interruption in the middle of the sliding sole.

Die Ringnuten einschliesslich der Bohrung 17 sowie Kugelkopf 3 können durch Dreh- und Bohrarbeitsgänge in einer Aufspannung des Gleitschuhs hergestellt werden, wodurch dessen Herstellungskosten sehr günstig liegen. Die Versorgung. des hydrostatischen Druckfelds über die flache Nut 22 beeinträchtigt den Aufbau hydrodynamischer Druckfelder nur wenig.The annular grooves including the bore 17 and the ball head 3 can be produced by turning and drilling operations in one clamping of the sliding block, as a result of which its manufacturing costs are very favorable. The supply. of the hydrostatic pressure field via the flat groove 22 affects the build-up of hydrodynamic pressure fields only slightly.

Selbstverständlich kann die Gleitschuhsohle auch flach ausgebildet sein, wie das bei Axialkolbenmaschinen üblich ist. Der gewöbte Gleitschuh ist dagegen für Radialkolbenmaschinen vorgesehen. Bei flachen Gleitsohlen ist allerdings die Herstellung der Nuten nicht so einfach, da sie zum Teil gefräst werden müssen.Of course, the sliding shoe sole can also be flat, as is customary in axial piston machines. The curved slide shoe, on the other hand, is intended for radial piston machines. In the case of flat sliding soles, however, the production of the grooves is not so easy, since some of them have to be milled.

Claims (4)

1. A slide shoe for hydrostatic piston machines on the slide sole (13) of which are formed hydrostatic and hydrodynamic pressure fields serving for relieving, wherein the central hydrostatic pressure field is Influenced through a bore (17) formed in the slide shoe (1) and in communication with the high pressure side and is bounded by a first annular groove (18, 30, 32, 34) surrounding it, and comprising a second annular groove (19, 31, 35) of greater diameter extending concentrically with reepect to the first annular groove and which issues at the side edge of the slide sole (13), characterised in that, both annular grooves - as is known - have a triangular cross-section and that the said cross-section is made so asymmetrical that the outer flank (19'') of the annular groove (19, 31, 35) with the larger diameter and the inner flank (18") of the annular groove (18, 30; 32, 34) with the smaller diameter forms a shallow angle with the slide sole whereas the two other flanks (18', 19') extend parallel to the axis of the shaft (2) of the slide shoe.
2. A slide shoe according to claim 1, characterised in that, the annular grooves (30, 31; 34) are interrupted and that the interruptions are located In the region of the centre of the slide sole (13) lying In the direction of movement.
3. A slide shoe according to claim 1 or 2, charac- tensed in that, the annular grooves (30, 31) consist of at least two branches lying symmetrically on different but concentric circular arcs and diametrally opposite one another, which do not touch in the region of the centre of the slide sole lying in the direction of movement.
4. A slide shoe according to claim 1, characterised in that, the annular grooves consist of a closed annular groove (32) lying centrally with respect to the slide sole and an interrupted annular groove (31) consisting of two symmetrical and diametrally opposite branches and that the latter do not touch in the region of the centre of the slide sole lying in the direction of movement.
EP79103993A 1978-11-11 1979-10-16 Sliding shoe for hydrostatic piston machines Expired EP0011145B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2849042 1978-11-11
DE19782849042 DE2849042A1 (en) 1978-11-11 1978-11-11 SLIDING SHOE FOR HYDROSTATIC PISTON MACHINES

Publications (2)

Publication Number Publication Date
EP0011145A1 EP0011145A1 (en) 1980-05-28
EP0011145B1 true EP0011145B1 (en) 1982-12-22

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EP79103993A Expired EP0011145B1 (en) 1978-11-11 1979-10-16 Sliding shoe for hydrostatic piston machines

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EP (1) EP0011145B1 (en)
JP (1) JPS5566672A (en)
DE (2) DE2849042A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2020254501A1 (en) 2019-06-19 2020-12-24 Moog Gmbh Radial reciprocating engine having a ball piston

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Publication number Priority date Publication date Assignee Title
JPS6224059Y2 (en) * 1979-02-28 1987-06-19

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US3049940A (en) * 1961-02-08 1962-08-21 American Brake Shoe Co Balanced piston shoe
GB983310A (en) * 1962-01-29 1965-02-17 Hans Thoma Improvements in or relating to swash plate or like pumps or motors
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020254501A1 (en) 2019-06-19 2020-12-24 Moog Gmbh Radial reciprocating engine having a ball piston

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EP0011145A1 (en) 1980-05-28
DE2849042A1 (en) 1980-05-22
JPS5566672A (en) 1980-05-20
DE2964371D1 (en) 1983-01-27

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