EP0233484A2 - Axial piston machine - Google Patents

Axial piston machine Download PDF

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Publication number
EP0233484A2
EP0233484A2 EP87100629A EP87100629A EP0233484A2 EP 0233484 A2 EP0233484 A2 EP 0233484A2 EP 87100629 A EP87100629 A EP 87100629A EP 87100629 A EP87100629 A EP 87100629A EP 0233484 A2 EP0233484 A2 EP 0233484A2
Authority
EP
European Patent Office
Prior art keywords
coating
axial piston
pistons
piston machine
machine according
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.)
Ceased
Application number
EP87100629A
Other languages
German (de)
French (fr)
Other versions
EP0233484A3 (en
Inventor
Klaus Dipl.-Ing. Griese
Dieter Dipl.-Ing. Weigle
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0233484A2 publication Critical patent/EP0233484A2/en
Publication of EP0233484A3 publication Critical patent/EP0233484A3/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0032—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F01B3/0035—Reciprocating-piston machines or engines with 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
    • 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
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]

Definitions

  • the invention relates to an axial piston machine according to the preamble of the main claim.
  • the thrust washers are mounted in the swivel disk either via roller bearings or plain bearings.
  • the thrust washer does not start safely and quickly due to the friction of the piston crowns due to the high initial friction between thrust washer and plain bearing.
  • the axial piston machine according to the invention with the characterizing features of the main claim has the advantage that it runs very quietly due to the good damping properties and that the initial friction between the thrust washer and plain bearings is very low.
  • Coatings made of graphite, carbon fibers, PTFE or similar coating materials have proven to be particularly useful.
  • the axial piston machine has an approximately cup-shaped housing 10, which is closed at the top by a cover 11.
  • a control mirror 12 is attached to the cover 11 in a rotationally fixed manner, against which the rotating cylinder drum 13 bears. This is driven by a shaft 14 which is mounted on the one hand in the cover by means of a roller bearing 15 and on the other hand in the lower part of the housing also by means of a roller bearing 16.
  • a plurality of bores 18 running parallel to the shaft 14 are formed in the cylinder drum, in which pistons 19 are slidably guided. At their ends protruding from the cylinder drum, these have crests 20 which are supported on a thrust washer 21.
  • the pressure plate 21 is mounted in a recess 22 of a swivel plate 23, in one case by means of a sliding bearing A (right half of the drawing), in the other case by means of a sliding bearing B (left half of the drawing).
  • the plain bearing consists of a axially arranged disc 24 and a radially arranged ring 25.
  • Both parts have a coating at the point of contact with the pressure disc 21, which consists for example of a plastic, graphite, carbon fibers, PTFE or other similar materials.
  • the thrust washer starts up easily and with little friction when the machine starts up.
  • the coating also achieves good damping properties and low noise.
  • the plain bearing consists of an angular ring disk 27, which is also arranged in a recess 28 of the swivel disk 23.
  • the angle washer 27 is again provided with the above-mentioned coating at its points of contact with the thrust washer 21.
  • the coating can of course also be arranged on the pressure plate.
  • the pivot plate 23 can be pivoted in a known manner with the aid of a piston 30 in its angular position for the purpose of changing the stroke.
  • a control device 31 is provided in a known manner, but this has not been discussed further, since it is not essential to the invention.

Abstract

The axial piston machine has pistons (18) guided in a cylinder drum (13), which pistons (18) are supported by means of their domes (20) on a pressure disc (21). The latter is supported in a swivelling disc (23) with the aid of a sliding bearing (24, 25; 27). On the contact points of the sliding bearings and swivelling disc there is arranged a coating which consists e.g. of plastic, graphite, carbon fibres, PTFE or similar materials. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Axialkolbenmaschine nach der Gattung des Hauptanspruchs. Bei derartigen Axial­kolbenmaschinen sind die Druckscheiben entweder über Rollenlager oder Gleitlager in der Schwenkscheibe ge­lagert. Bei Verwendung von reinen Metallgleitlagern wird ein sicheres und schnelles Anlaufen der Druckscheibe in­folge Mitnahmereibung der Kolbenkuppen aufgrund der hohen Anfangshaftreibung zwischen Druckscheibe und Gleitlager nicht erreicht.The invention relates to an axial piston machine according to the preamble of the main claim. In such axial piston machines, the thrust washers are mounted in the swivel disk either via roller bearings or plain bearings. When using pure metal plain bearings, the thrust washer does not start safely and quickly due to the friction of the piston crowns due to the high initial friction between thrust washer and plain bearing.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Axialkolbenmaschine mit den kenn­zeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß sie infolge der guten Dämpfungseigen­schaften sehr geräuscharm läuft und daß die Anfangshaft­reibung zwischen Druckscheibe und Gleitlagern sehr gering ist.The axial piston machine according to the invention with the characterizing features of the main claim has the advantage that it runs very quietly due to the good damping properties and that the initial friction between the thrust washer and plain bearings is very low.

Als besonders zweckmäßig haben sich Beschichtungen aus Graphit, Kohlefasern, PTFE oder ähnlichen Beschichtungs­werkstoffen erwiesen.Coatings made of graphite, carbon fibers, PTFE or similar coating materials have proven to be particularly useful.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeich­nung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Diese zeigt eine Axialkolbenmaschine im Längsschnitt, wobei die Gleitlagerung in der linken Hälfte der Zeichnung anders ausgebildet ist als in der rechten.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. This shows an axial piston machine in longitudinal section, the slide bearing being designed differently in the left half of the drawing than in the right half.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Axialkolbenmaschine weist ein etwa topfförmiges Ge­häuse 10 auf, das oben durch einen Deckel 11 verschlossen ist. Am Deckel 11 ist drehfest ein Steuerspiegel 12 ange­bracht, an den sich die rotierende Zylindertrommel 13 anlegt. Diese wird durch eine Welle 14 angetrieben, die einerseits im Deckel mittels eines Wälzlagers 15, anderer­seits im Unterteil des Gehäuses ebenfalls mittels eines Wälzlagers 16 gelagert ist.The axial piston machine has an approximately cup-shaped housing 10, which is closed at the top by a cover 11. A control mirror 12 is attached to the cover 11 in a rotationally fixed manner, against which the rotating cylinder drum 13 bears. This is driven by a shaft 14 which is mounted on the one hand in the cover by means of a roller bearing 15 and on the other hand in the lower part of the housing also by means of a roller bearing 16.

In der Zylindertrommel sind mehrere, parallel zur Welle 14 verlaufende Bohrungen 18 ausgebildet, in denen Kolben 19 gleitend geführt sind. Diese weisen an ihren aus der Zylindertrommel ragenden Enden Kuppen 20 auf, die sich auf einer Druckscheibe 21 abstützen. Die Druckscheibe 21 ist in einer Ausnehmung 22 einer Schwenkscheibe 23 ge­lagert, und zwar in einem Fall mittels einer Gleitlage­rung A (rechte Hälfte der Zeichnung), im anderen Fall mittels einer Gleitlagerung B (linke Hälfte der Zeich­nung). Im Falle A besteht die Gleitlagerung aus einer axial angeordneten Scheibe 24 und einem radial ange­ordneten Ring 25. Beide Teile weisen an der Berührungs­stelle mit der Druckscheibe 21 eine Beschichtung auf, die zum Beispiel aus einem Kunststoff, Graphit, Kohle­fasern, PTFE oder anderen ähnlichen Werkstoffen besteht. Auf diese Weise erreicht man ein leichtes, reibungsarmes Anlaufen der Druckscheibe beim Anfahren der Maschine. Außerdem werden durch die Beschichtung auch gute Dämpfungs­eigenschaften und Geräuscharmut erreicht.A plurality of bores 18 running parallel to the shaft 14 are formed in the cylinder drum, in which pistons 19 are slidably guided. At their ends protruding from the cylinder drum, these have crests 20 which are supported on a thrust washer 21. The pressure plate 21 is mounted in a recess 22 of a swivel plate 23, in one case by means of a sliding bearing A (right half of the drawing), in the other case by means of a sliding bearing B (left half of the drawing). In case A, the plain bearing consists of a axially arranged disc 24 and a radially arranged ring 25. Both parts have a coating at the point of contact with the pressure disc 21, which consists for example of a plastic, graphite, carbon fibers, PTFE or other similar materials. In this way, the thrust washer starts up easily and with little friction when the machine starts up. In addition, the coating also achieves good damping properties and low noise.

Im Falle B besteht die Gleitlagerung aus einer Winkelring­scheibe 27, die ebenfalls in einer Ausnehmung 28 der Schwenk­scheibe 23 angeordnet ist. Die Winkelringscheibe 27 ist an ihren Berührungsstellen mit der Druckscheibe 21 ebenfalls wieder mit der obengenannten Beschichtung versehen.In case B, the plain bearing consists of an angular ring disk 27, which is also arranged in a recess 28 of the swivel disk 23. The angle washer 27 is again provided with the above-mentioned coating at its points of contact with the thrust washer 21.

Die Beschichtung kann natürlich auch an der Druckscheibe angeordnet sein.The coating can of course also be arranged on the pressure plate.

Die Schwenkscheibe 23 kann in bekannter Weise mit Hilfe eines Kolbens 30 in ihrer Winkellage zwecks Hubänderung geschwenkt werden. Zur Betätigung des Kolbens 30 ist in bekannter Weise eine Regeleinrichtung 31 vorgesehen, auf welche jedoch nicht weiter eingegangen ist, da nicht er­findungswesentlich.The pivot plate 23 can be pivoted in a known manner with the aid of a piston 30 in its angular position for the purpose of changing the stroke. In order to actuate the piston 30, a control device 31 is provided in a known manner, but this has not been discussed further, since it is not essential to the invention.

Claims (4)

1. Axialkolbenmaschine mit einer rotierenden Zylindertrommel mit Kolben aufnehmenden Bohrungen, wobei sich die Kuppen (20) der Kolben (19) auf einer Druckscheibe (21) abstützen, die mit Hilfe von Gleitlagern in einer den Hub der Kolben bestimmenden Schwenkscheibe (23) drehbar gelagert ist, da­durch gekennzeichnet, daß an den Kontaktstellen von Gleit­lager (24, 25; 27) und Druckscheibe (21) eine Beschich­tung angeordnet ist.1. Axial piston machine with a rotating cylinder drum with piston-receiving bores, the tips (20) of the pistons (19) being supported on a thrust washer (21) which is rotatably supported by means of slide bearings in a swivel disk (23) which determines the stroke of the pistons is characterized in that a coating is arranged at the contact points of the slide bearing (24, 25; 27) and thrust washer (21). 2. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß die Beschichtun aus Kunststoff, Graphit, Kohlefasern, PTFE oder ähnlichen Werkstoffen besteht.2. Machine according to claim 1, characterized in that the coating consists of plastic, graphite, carbon fibers, PTFE or similar materials. 3. Maschine nach Anspruch 1 und/oder 2, dadurch gekenn­zeichnet, daß die Beschichtung an der Druckscheibe ange­ordnet ist.3. Machine according to claim 1 and / or 2, characterized in that the coating is arranged on the pressure plate. 4. Maschine nach Anspruch 1 und/oder 2, dadurch gekenn­zeichnet, daß die Beschichtung an den Gleitlagerteilen angeordnet ist.4. Machine according to claim 1 and / or 2, characterized in that the coating is arranged on the slide bearing parts.
EP87100629A 1986-02-19 1987-01-19 Axial piston machine Ceased EP0233484A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8604342U 1986-02-19
DE19868604342 DE8604342U1 (en) 1986-02-19 1986-02-19

Publications (2)

Publication Number Publication Date
EP0233484A2 true EP0233484A2 (en) 1987-08-26
EP0233484A3 EP0233484A3 (en) 1988-09-21

Family

ID=6791806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100629A Ceased EP0233484A3 (en) 1986-02-19 1987-01-19 Axial piston machine

Country Status (2)

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EP (1) EP0233484A3 (en)
DE (1) DE8604342U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4413792A1 (en) * 1993-08-11 1995-02-16 Kubota Kk Construction for setting a swash plate angle of a hydraulic variable motor
DE10344152A1 (en) * 2003-09-22 2005-04-21 Klaus Riedel Combination bolt securing a valve block to a hydraulic piston-driven pump is fabricated as a one-piece component

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE820241C (en) * 1949-12-15 1951-11-08 Kloeckner Humboldt Deutz Ag pump
GB669878A (en) * 1949-11-25 1952-04-09 William Harvey Anderson Improvements in and relating to gaseous pressure motors
GB791992A (en) * 1955-09-19 1958-03-19 Sundstrand Machine Tool Co Improvements in or relating to hydraulic pump or motor
GB1031731A (en) * 1962-01-26 1966-06-02 Lely Nv C Van Der Improvements in or relating to hydraulic pumps and motors
DE1653598B1 (en) * 1963-08-08 1971-03-04 Gustav Richter Maschinenfabrik Storage of the swash plate in the housing of an axial piston machine
DE2917771A1 (en) * 1978-05-30 1979-12-06 Glacier Metal Co Ltd SWASHPLATE PUMP OR -ENGINE
GB1594347A (en) * 1977-09-22 1981-07-30 Halford E A Steam operable piston engines
DE3342593A1 (en) * 1983-11-25 1985-06-05 Glyco-Metall-Werke Daelen & Loos Gmbh, 6200 Wiesbaden Heavy-duty heat-resistant laminated composite material, in particular a composite material for sliding bearings, and process for the production thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB669878A (en) * 1949-11-25 1952-04-09 William Harvey Anderson Improvements in and relating to gaseous pressure motors
DE820241C (en) * 1949-12-15 1951-11-08 Kloeckner Humboldt Deutz Ag pump
GB791992A (en) * 1955-09-19 1958-03-19 Sundstrand Machine Tool Co Improvements in or relating to hydraulic pump or motor
GB1031731A (en) * 1962-01-26 1966-06-02 Lely Nv C Van Der Improvements in or relating to hydraulic pumps and motors
DE1653598B1 (en) * 1963-08-08 1971-03-04 Gustav Richter Maschinenfabrik Storage of the swash plate in the housing of an axial piston machine
GB1594347A (en) * 1977-09-22 1981-07-30 Halford E A Steam operable piston engines
DE2917771A1 (en) * 1978-05-30 1979-12-06 Glacier Metal Co Ltd SWASHPLATE PUMP OR -ENGINE
DE3342593A1 (en) * 1983-11-25 1985-06-05 Glyco-Metall-Werke Daelen & Loos Gmbh, 6200 Wiesbaden Heavy-duty heat-resistant laminated composite material, in particular a composite material for sliding bearings, and process for the production thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4413792A1 (en) * 1993-08-11 1995-02-16 Kubota Kk Construction for setting a swash plate angle of a hydraulic variable motor
US5560277A (en) * 1993-08-11 1996-10-01 Kubota Corporation Structure for adjusting swash plate angle of a variable displacement hydraulic motor
DE10344152A1 (en) * 2003-09-22 2005-04-21 Klaus Riedel Combination bolt securing a valve block to a hydraulic piston-driven pump is fabricated as a one-piece component

Also Published As

Publication number Publication date
DE8604342U1 (en) 1987-06-19
EP0233484A3 (en) 1988-09-21

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Inventor name: GRIESE, KLAUS, DIPL.-ING.

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