EP1831551B1 - Dry running swashplate compressor comprising a coated swashplate - Google Patents

Dry running swashplate compressor comprising a coated swashplate Download PDF

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Publication number
EP1831551B1
EP1831551B1 EP05817800A EP05817800A EP1831551B1 EP 1831551 B1 EP1831551 B1 EP 1831551B1 EP 05817800 A EP05817800 A EP 05817800A EP 05817800 A EP05817800 A EP 05817800A EP 1831551 B1 EP1831551 B1 EP 1831551B1
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EP
European Patent Office
Prior art keywords
swashplate
bearing
dry running
swash plate
sliding friction
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EP05817800A
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German (de)
French (fr)
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EP1831551A1 (en
Inventor
Dieter Spurny
Michael Kramer
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Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
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Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
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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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1054—Actuating elements
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F04B39/066—Cooling by ventilation
    • 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]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the present invention relates to a dry-running swash plate compressor, in particular for compressed air generation in commercial vehicles, with a swash plate attached to a drive shaft, which converts the driving rotary motion into an oscillating stroke movement via a bearing arrangement interacting with the outer radial edge region, wherein the swash plate engages at least in the contact region with the bearing arrangement a made of a PTFE material, additional coating to reduce the sliding friction is provided.
  • a swash plate compressor which are usually driven directly by the engine of the commercial vehicle and supply compressed air to feed the compressed air electrical system. In commercial vehicles, the compressed air thus generated is used for example for operating a compressed air brake system.
  • a dry-running swash plate compressor is understood in the context of the invention, a swash plate compressor whose cooperating with the engine side air side is running at least dry running.
  • oil-lubricated reciprocating compressors are used for the production of compressed air in commercial vehicles.
  • the lubrication of these compressors usually takes place from the oil circuit of the engine.
  • oil passes through the pistons of the compressor in the generated compressed air.
  • significant quantities of oil can enter the environment via the compressed air, namely via various vents in the compressed air system.
  • Another problem oil-lubricated piston compressor in the commercial vehicle sector is that ever higher operating pressures are required from the compressor, which is accompanied by quite high thermal stresses, resulting in coking of a portion of the in the Compressed air got oil leads. This carbon deposits itself within the interior of the cylinder in the compressor and downstream compressed air devices and influences there very sustainably their life.
  • the compressor is constructed in the manner of a swash plate compressor and has only a conventional oil-lubricated engine, which consists essentially of a arranged on a drive shaft swash plate with hemispheres in bearing cups, which form a bearing assembly for transmitting the rotational movement in an oscillating stroke. From the bearing assembly extend piston rods to various pistons, which generate by a reciprocating motion in associated cylinders in a conventional manner, the compressed air. Usually several pistons are arranged on a circumferential circle adjacent to each other in order to realize the highest possible delivery of the swash plate compressor.
  • the attachment of the swash plate to the drive shaft is usually via a hub-shaft connection or by shrinking the central bore having a swash plate on the drive shaft.
  • the connection is detachable for repair purposes.
  • there is an insoluble compound insoluble compound.
  • a critical issue in the prior design of the swashplate compressor engine is the design of the bearing assembly cooperating with the outer radial edge region of the swashplate. Because of the relative movement of the swash plate against the hemispheres of the bearing assembly here is a particularly high friction stress, which has previously been reduced by lubricating measures to a tolerable level. The friction causes an undesirable heat development in the area of the engine. The heat development is particularly strong when the piston perform their working movements against a high back pressure.
  • a dry-running swash plate compressor which has a swash plate attached to a drive shaft, which converts the driving rotary motion into an oscillating stroke movement via a position arrangement cooperating with the outer radial edge region.
  • a coating of a PTFE material for reducing the sliding friction is provided at least in the contact region of the swash plate with the bearing assembly.
  • a disadvantage of such a design is that lubrication and cooling of the contact area is not provided and thus the efficiency of the swash plate compressor is not optimal.
  • the invention includes the technical teaching that the swash plate is provided only on the side facing the piston with the coating for reducing the sliding friction and also for lubrication and cooling of the contact areas between swash plate and bearing assembly, the housing has spray oil holes through which targeted oil and doses is delivered to the contact areas.
  • PTFE polytetrafluoroethylene
  • Teflon polytetrafluoroethylene
  • the coating material is resistant to permanent heat up to about 260 ° C. It is not attacked by solvents or aggressive chemicals and is so smooth and lubricious on the surface, that hardly a foreign substance sticks to it. Since the coating material has a static friction which is the same as the sliding friction, the transition from standstill to movement takes place without jerking, which ensures a soft start-up behavior of the swash plate compressor.
  • the application of the coating to reduce the sliding friction can be carried out by using a PTFE film, which is applied to the surface of the swash plate.
  • the PTFE film should be glued flat or in a fixed design on the swash plate.
  • the arranged between the swash plate and piston rod bearing assembly consists of two hemispherical bearing stones, which are held in a form-fitting manner in the respective corresponding bearing cups by a U-shaped bearing bridge of the piston rod.
  • the respective straight bearing surfaces of the hemispherical bearing stones come in the outer radial edge region of the swash plate to the plant.
  • the hemispherical bearing blocks can also be provided by the straight bearing surface with a coating to reduce the sliding friction. This additional Measure ensures a further reduction of the sliding friction between the swash plate and bearing assembly.
  • jewels completely made of PTFE.
  • a cooling air flow flows through the interior of the engine in order to discharge the heat resulting from the dry running with the cooling air flow to the outside.
  • Fig.1 has the dry-running swash plate compressor shown here on the part of the engine to a drive shaft 1, which is offset by a - not shown here - engine in rotary motion.
  • a swash plate 2 is fixed in a conventional manner.
  • the swash plate 2 is about a bearing assembly 3, the rotational movement of the drive shaft 1 in an oscillating stroke movement.
  • the lifting movement is transmitted to a mounted on the bearing assembly 3 piston rod 4.
  • piston rod 4 In addition to the piston rod 4 further piston rods with associated bearing arrangements are available; The following description is thus to be understood as an example.
  • the piston rod 4 forwards the reciprocating motion generated due to the rotation of the swash plate 2 to a piston 5 which is fixed coaxially to the end of the piston rod 4 opposite the bearing assembly 3.
  • the piston 5 runs within an associated cylinder 6, in which the compressed air due to the movement of the piston 5 is generated.
  • a suction of air from the atmosphere follows through the piston 5, which has a check valve 7 for this purpose.
  • the compressed compressed air leaves the cylinder 6 via another appropriately designed check valve 8 on the cylinder head 9, which is mounted on the valve housing 10.
  • the piston rod 4 is guided axially via a stationary to the compressor housing 10 arranged bearing bore 11.
  • the latter is provided in the contact region to the bearing assembly 3 with an additional coating 12.
  • the bearing assembly 3 consists of two hemispherical bearing blocks 13a, 13b, which are held in each corresponding bearing cups by a U-shaped bearing bridge 14 of the piston rod 4 pivotally positively, so that the respective straight bearing surfaces of the hemispherical bearing blocks 13a, 13b in the outer radial edge region of the swash plate 2 come on the coating 12 to the plant.
  • the housing 10 has spray oil bores 15 from which oil reaches the areas of contact to be lubricated between the swash plate 2 and the bearing arrangement 3 in a targeted and metered manner. The oil passes indirectly from the spray oil hole 15 under the influence of the rapid rotation of the drive shaft 1 to be lubricated contact areas.
  • a PTFE film is used, which is applied to the surface of the swash plate 2.
  • the swash plate 2 is provided only on the - not shown here - the piston 5 facing side surface with the coating 12 to reduce the sliding friction.
  • Such a coated swash plate 2 is also quite suitable for use in conjunction with an oil-lubricated engine of a swash plate compressor.
  • the interior of the engine can be traversed by a flow of cooling air to dissipate the resulting due to the dry running heat to the outside.

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

Abstract

Disclosed is a dry running swashplate compressor, especially for producing compressed air in utility vehicles, comprising a swashplate (2) that is fastened to a drive shaft (1) and converts the driving rotary movement into an oscillating lifting movement via a bearing arrangement (3) which cooperates with the radially exterior edge region, said lifting movement redirecting a piston rod (4) that is mounted on the bearing arrangement (3) to pistons (5) which run in an associated cylinder (6) in order to produce the compressed air. The swashplate (2) is provided with an additional coating (12) at least in the contact zone with the bearing arrangement (3) so as to reduce sliding friction.

Description

Die vorliegende Erfindung betrifft einen trockenlaufenden Taumelscheibenverdichter, insbesondere zur Drucklufterzeugung in Nutzfahrzeugen, mit einer an einer Antriebswelle befestigten Taumelscheibe, die über eine mit dem außenradialen Randbereich zusammenwirkende Lageranordnung die antreibende Drehbewegung in eine oszillierende Hubbewegung umsetzt, wobei die Taumelscheibe zumindest im Kontaktbereich zu der Lageranordnung mit einer aus einem PTFE-Werkstoff bestehenden, zusätzlichen Beschichtung zur Reduzierung der Gleitreibung versehen ist.The present invention relates to a dry-running swash plate compressor, in particular for compressed air generation in commercial vehicles, with a swash plate attached to a drive shaft, which converts the driving rotary motion into an oscillating stroke movement via a bearing arrangement interacting with the outer radial edge region, wherein the swash plate engages at least in the contact region with the bearing arrangement a made of a PTFE material, additional coating to reduce the sliding friction is provided.

Das Einsatzgebiet eines derartigen Taumelscheibenverdichters erstreckt sich vornehmlich auf die Nutzfahrzeugtechnik. In Nutzfahrzeugen kommen Verdichter zum Einsatz, welche meist direkt über den Motor des Nutzfahrzeuges angetrieben werden und Druckluft zur Speisung des Druckluft-Bordnetzes liefern. Bei Nutzfahrzeugen wird die so erzeugte Druckluft beispielsweise zum Betrieb einer Druckluft-Bremsanlage genutzt. Als trockenlaufender Taumelscheibenverdichter wird im Rahmen der Erfindung ein Taumelscheibenverdichter verstanden, dessen mit der Triebwerkseite zusammenwirkende Luftseite zumindest trockenlaufend ausgeführt ist.The field of application of such a swash plate compressor extends primarily to commercial vehicle technology. In commercial vehicles come compressors are used, which are usually driven directly by the engine of the commercial vehicle and supply compressed air to feed the compressed air electrical system. In commercial vehicles, the compressed air thus generated is used for example for operating a compressed air brake system. As a dry-running swash plate compressor is understood in the context of the invention, a swash plate compressor whose cooperating with the engine side air side is running at least dry running.

In allgemein bekannter Weise werden für die Drucklufterzeugung in Nutzfahrzeugen vornehmlich ölgeschmierte Kolbenverdichter eingesetzt. Die Schmierung dieser Verdichter erfolgt meist aus dem Ölkreislauf des Motors. Hierbei gelangt allerdings zwangsläufig Öl über die Kolben des Verdichters in die erzeugte Druckluft. Je nach Alter und Wartungszustand des Verdichters können erhebliche Ölmengen über die Druckluft in die Umwelt gelangen, nämlich über diverse Entlüftungsöffnungen des Druckluft-Bordnetzes. Ein weiteres Problem ölgeschmierter Kolbenverdichter im Nutzfahrzeugbereich besteht darin, dass immer höhere Betriebsdrücke vom Verdichter abverlangt werden, womit recht hohe thermische Beanspruchungen einhergehen, welche zu Verkokungen eines Teils des in die Druckluft gelangten Öls führt. Diese Ölkohle lagert sich innerhalb des Innenraums des Zylinders im Verdichter und nachgeschalteten Druckluftgeräten ab und beeinflusst dort sehr nachhaltig deren Standzeit.In a generally known manner, primarily oil-lubricated reciprocating compressors are used for the production of compressed air in commercial vehicles. The lubrication of these compressors usually takes place from the oil circuit of the engine. In this case, however, inevitably oil passes through the pistons of the compressor in the generated compressed air. Depending on the age and maintenance condition of the compressor, significant quantities of oil can enter the environment via the compressed air, namely via various vents in the compressed air system. Another problem oil-lubricated piston compressor in the commercial vehicle sector is that ever higher operating pressures are required from the compressor, which is accompanied by quite high thermal stresses, resulting in coking of a portion of the in the Compressed air got oil leads. This carbon deposits itself within the interior of the cylinder in the compressor and downstream compressed air devices and influences there very sustainably their life.

Aus der EP 0 859 151 A2 geht ein Verdichter zur Drucklufterzeugung in Nutzfahrzeugen hervor, welcher dieses Problem dadurch löst, in dem der Verdichter hier weitestgehend trockenlaufend konstruiert ist. Der Verdichter ist nach Art eines Taumelscheibenverdichters aufgebaut und weist lediglich ein herkömmliches ölgeschmiertes Triebwerk auf, welches im Wesentlichen aus einer auf einer Antriebswelle angeordneten Taumelscheibe mit Halbkugeln in Lagerpfannen besteht, die eine Lageranordnung zu Übertragung der Drehbewegung in eine oszillierende Hubbewegung bilden. Von der Lageranordnung aus verlaufen Kolbenstangen zu diversen Kolben, welche durch eine Hin- und Herbewegung in zugeordneten Zylindern in an sich bekannter Weise die Druckluft erzeugen. Gewöhnlich sind mehrere Kolben auf einem Umfangskreis benachbart zueinander angeordnet, um eine möglichst hohe Förderleistung des Taumelscheibenverdichters zu realisieren.From the EP 0 859 151 A2 goes out a compressor for compressed air generation in commercial vehicles, which solves this problem in that the compressor is designed here largely dry running. The compressor is constructed in the manner of a swash plate compressor and has only a conventional oil-lubricated engine, which consists essentially of a arranged on a drive shaft swash plate with hemispheres in bearing cups, which form a bearing assembly for transmitting the rotational movement in an oscillating stroke. From the bearing assembly extend piston rods to various pistons, which generate by a reciprocating motion in associated cylinders in a conventional manner, the compressed air. Usually several pistons are arranged on a circumferential circle adjacent to each other in order to realize the highest possible delivery of the swash plate compressor.

Die Befestigung der Taumelscheibe an der Antriebswelle erfolgt gewöhnlich über eine Nabe-Welle-Verbindung oder durch Aufschrumpfen der eine zentrale Bohrung aufweisenden Taumelscheibe auf die Antriebswelle. Ersterenfalls ist die Verbindung zu Reparaturzwecken lösbar. Letzerenfalls liegt eine unlösbare Verbindung vor. Stets erfolgt beim Stand der Technik jedoch eine ortsfeste Befestigung der Taumelscheibe gegenüber der Antriebswelle.The attachment of the swash plate to the drive shaft is usually via a hub-shaft connection or by shrinking the central bore having a swash plate on the drive shaft. In the first case, the connection is detachable for repair purposes. In the latter case, there is an insoluble compound. Always done in the prior art, however, a fixed attachment of the swash plate against the drive shaft.

Ein kritischer Punkt bei der bekannten Konstruktion des Triebwerks eines Taumelscheibenverdichters besteht in der Gestaltung der mit dem außenradialen Randbereich der Taumelscheibe zusammenwirkenden Lageranordnung. Wegen der relativen Bewegung der Taumelscheibe gegenüber den Halbkugeln der Lageranordnung entsteht hier eine besonders hohe Reibbeanspruchung, welche bisher durch Schmiermaßnahmen auf ein erträgliches Maß reduziert wird. Die Reibung verursacht eine unerwünschte Wärmeentwicklung im Bereich des Triebwerks. Die Wärmeentwicklung ist besonders stark, wenn die Kolben ihre Arbeitsbewegungen gegen einen hohen Gegendruck ausführen.A critical issue in the prior design of the swashplate compressor engine is the design of the bearing assembly cooperating with the outer radial edge region of the swashplate. Because of the relative movement of the swash plate against the hemispheres of the bearing assembly here is a particularly high friction stress, which has previously been reduced by lubricating measures to a tolerable level. The friction causes an undesirable heat development in the area of the engine. The heat development is particularly strong when the piston perform their working movements against a high back pressure.

Aus der DE 103 28 120 A1 ist ein trockenlaufender Taumelscheibenverdichter bekannt, welche eine an einer Antriebswelle befestigte Taumelscheibe aufweist, die über eine mit dem außenradialen Randbereich zusammenwirkende Lageanordnung die antreibende Drehbewegung in eine oszillierende Hubbewegung umsetzt. Hierbei ist zumindest im Kontaktbereich der Taumelscheibe mit der Lageranordnung eine Beschichtung aus einem PTFE-Werkstoff zur Reduzierung der Gleitreibung vorgesehen.From the DE 103 28 120 A1 a dry-running swash plate compressor is known, which has a swash plate attached to a drive shaft, which converts the driving rotary motion into an oscillating stroke movement via a position arrangement cooperating with the outer radial edge region. Here, a coating of a PTFE material for reducing the sliding friction is provided at least in the contact region of the swash plate with the bearing assembly.

Nachteilhaft an einer derartigen Ausführung ist, dass eine Schmierung und Kühlung des Kontaktbereichs nicht vorgesehen ist und somit der Wirkungsgrad des Taumelscheibenverdichters nicht optimal ist.A disadvantage of such a design is that lubrication and cooling of the contact area is not provided and thus the efficiency of the swash plate compressor is not optimal.

Es ist daher die Aufgabe der vorliegenden Erfindung, einen trockenlaufenden Taumelscheibenverdichter zu schaffen, bei dem besondere Maßnahmen hinsichtlich einer Reduzierung der Gleitreibung im Bereich der Taumelscheibe getroffen sind.It is therefore an object of the present invention to provide a dry-running swash plate compressor, are taken in the special measures to reduce the sliding friction in the swash plate.

Die Aufgabe wird ausgehend von einem trockenlaufenden Taumelscheibenverdichter gemäß dem Oberbegriff von Anspruch 1 in Verbindung mit dessen kennzeichnenden Merkmalen gelöst. Die nachfolgenden abhängigen Ansprüche geben vorteilhafte Weiterbildungen der Erfindung wieder.The object is achieved on the basis of a dry running swash plate compressor according to the preamble of claim 1 in conjunction with its characterizing features. The following dependent claims give advantageous developments of the invention.

Die Erfindung schließt die technische Lehre ein, dass die Taumelscheibe nur an der den Kolben zugewandten Seitenfläche mit der Beschichtung zur Reduzierung der Gleitreibung versehen ist und zudem zur Schmierung und Kühlung der Kontaktbereiche zwischen Taumelscheibe und Lageranordnung das Gehäuse Spritzölbohrungen aufweist, durch welche Öl gezielt und dosiert an die Kontaktbereiche abgegeben wird.The invention includes the technical teaching that the swash plate is provided only on the side facing the piston with the coating for reducing the sliding friction and also for lubrication and cooling of the contact areas between swash plate and bearing assembly, the housing has spray oil holes through which targeted oil and doses is delivered to the contact areas.

Ein Vorteil dieser fertigungstechnisch relativ einfach umsetzbaren Maßnahme besteht darin, dass die Gleitreibung zwischen der Taumelscheibe und der Lageranordnung signifikant sinkt, so dass an dieser Stelle weniger Wärme aufgrund der Reibung entsteht. Dieses Ziel wird dabei nicht - wie der Fachmann üblicherweise vorgehen würde - durch eine Verbesserung der Schmierung oder der Oberfläche der Taumelscheibe selbst erreicht, sondern durch eine Beschichtung mit einem anderen Material. Insoweit zeigt die erfindungsgemäße Lösung hier einen anderen Weg auf.An advantage of this production technology relatively easily implementable measure is that the sliding friction between the swash plate and the bearing assembly significantly decreases, so that less heat due to friction arises at this point. This goal is not achieved - as the skilled person would usually do - by improving the lubrication or the surface of the swash plate itself, but by a coating with another material. In that regard, the solution according to the invention shows a different route here.

Vorzugsweise besteht die Beschichtung zur Reduzierung der Gleitreibung zwischen Taumelscheibe und Lageranordnung erfindungsgemäß aus einem PTFE-Werkstoff (PTFE=Polytetrafluorethylen). Dieser Werkstoff, der auch unter dem Handelsnamen Teflon bekannt ist, eignet sich wegen besonders hoher Druckbeanspruchbarkeit ganz besonders für den erfindungsgemäßen Einsatzzweck. Das Beschichtungsmaterial ist dauerwärmebeständig bis etwa 260° C. Es wird weder von Lösungsmitteln noch von aggressiven Chemikalien angegriffen und ist an der Oberfläche so glatt und gleitfähig, dass kaum eine Fremdsubstanz daran haften bleibt. Da das Beschichtungsmaterial eine Haftreibung aufweist, welche genauso groß wie die Gleitreibung ist, findet der Übergang von Stillstand zu Bewegung ohne ruckeln statt, was ein weiches Anlaufverhalten des Taumelscheibenverdichters gewährleistet.According to the invention, the coating for reducing the sliding friction between the swash plate and the bearing arrangement preferably consists of a PTFE material (PTFE = polytetrafluoroethylene). This material, which is also known under the trade name Teflon, is particularly suitable for the purpose of the invention because of its particularly high compressive strength. The coating material is resistant to permanent heat up to about 260 ° C. It is not attacked by solvents or aggressive chemicals and is so smooth and lubricious on the surface, that hardly a foreign substance sticks to it. Since the coating material has a static friction which is the same as the sliding friction, the transition from standstill to movement takes place without jerking, which ensures a soft start-up behavior of the swash plate compressor.

Da die Materialkosten des vorstehend als besonders geeignet angegebenen Werkstoffs recht hoch sind, kann durch die einseitige Beschichtung der Taumelscheibe der Herstellungsaufwand gesenkt werden. An dieser Stelle tritt auch die größte Gleitreibung zwischen der Taumelscheibe und der Lageranordnung auf, da hierüber die Druckbeaufschlagung der Kolbenstange entgegen des im Zylinder anstehenden Kompressionsdruckes erfolgt. Durch die Anordnung der Spritzölbohrung im Gehäuse wird eine nur lokale Schmierung der schmierungsbedürftigen Stellen des Triebwerks erreicht. Auf eine herkömmliche Ölbadschmierung kann insoweit verzichtet werden.Since the material costs of the material specified above as being particularly suitable are quite high, production costs can be reduced by the one-sided coating of the swash plate. At this point, the largest sliding friction occurs between the swash plate and the bearing assembly, as this takes place the pressurization of the piston rod against the imminent compression in the cylinder. The arrangement of the spray oil hole in the housing only a local lubrication of the engine parts requiring lubrication is achieved. In this respect, conventional oil bath lubrication can be dispensed with.

Das Aufbringen der Beschichtung zur Reduzierung der Gleitreibung kann dadurch erfolgen, indem eine PTFE-Folie zum Einsatz kommt, welche auf die Oberfläche der Taumelscheibe aufgebracht wird. In diesem Falle wäre die PTFE-Folie flächig oder in gefasster Ausführung auf die Taumelscheibe aufzukleben.The application of the coating to reduce the sliding friction can be carried out by using a PTFE film, which is applied to the surface of the swash plate. In this case, the PTFE film should be glued flat or in a fixed design on the swash plate.

Vorzugsweise besteht die zwischen Taumelscheibe und Kolbenstange angeordnete Lagerordnung aus zwei halbkugelförmigen Lagersteinen, die in die jeweils korrespondierenden Lagerpfannen seitens einer U-förmigen Lagerbrücke der Kolbenstange verschwenkbar formschlüssig gehalten sind. Hierbei kommen die jeweils geraden Lagerflächen der halbkugelförmigen Lagersteine im außenradialen Randbereich an der Taumelscheibe zur Anlage. Bei dieser Ausgestaltung der Lageranordnung können die halbkugelförmigen Lagersteine seitens der geraden Lagerfläche ebenfalls mit einer Beschichtung zur Reduzierung der Gleitreibung versehen werden. Diese zusätzliche Maßnahme gewährleistet eine weitere Verringerung der Gleitreibung zwischen Taumelscheibe und Lageranordnung. Ferner ist es auch denkbar, Lagersteine selbst vollständig aus PTFE herzustellen.Preferably, the arranged between the swash plate and piston rod bearing assembly consists of two hemispherical bearing stones, which are held in a form-fitting manner in the respective corresponding bearing cups by a U-shaped bearing bridge of the piston rod. Here, the respective straight bearing surfaces of the hemispherical bearing stones come in the outer radial edge region of the swash plate to the plant. In this embodiment of the bearing arrangement, the hemispherical bearing blocks can also be provided by the straight bearing surface with a coating to reduce the sliding friction. This additional Measure ensures a further reduction of the sliding friction between the swash plate and bearing assembly. Furthermore, it is also conceivable to make jewels completely made of PTFE.

Zur weiteren Verbesserung der Kühlung der Kontaktbereiche zwischen Taumelscheibe und Lageranordnung wird vorgeschlagen, dass der Innenraum des Triebwerks von einem Kühlluftstrom durchströmt wird, um die aufgrund der Trockenlaufs entstehende Wärme mit dem Kühlluftstrom nach außen abzuführen.To further improve the cooling of the contact areas between the swash plate and the bearing arrangement, it is proposed that a cooling air flow flows through the interior of the engine in order to discharge the heat resulting from the dry running with the cooling air flow to the outside.

Weitere die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher dargestellt. Es zeigt:

Fig.1
einen Längsschnitt durch einen trockenlaufenden Taumelscheibenverdichter, und
Fig.2
eine schematische Seitenansicht einer Taumelscheibe mit Beschichtung.
Further measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS. It shows:
Fig.1
a longitudinal section through a dry-running swash plate compressor, and
Fig.2
a schematic side view of a swash plate with coating.

Gemäß Fig.1 weist der hier dargestellte trockenlaufende Taumelscheibenverdichter auf Seiten des Triebwerks eine Antriebswelle 1 auf, welche durch einen - hier nicht weiter dargestellten - Motor in Drehbewegung versetzt wird. An der Antriebswelle 1 ist eine Taumelscheibe 2 in an sich bekannter Weise befestigt. Die Taumelscheibe 2 setzt über eine Lageranordnung 3 die Drehbewegung der Antriebswelle 1 in eine oszilierende Hubbewegung um. Die Hubbewegung wird auf eine an der Lageranordnung 3 angebrachten Kolbenstange 4 übertragen.According to Fig.1 has the dry-running swash plate compressor shown here on the part of the engine to a drive shaft 1, which is offset by a - not shown here - engine in rotary motion. On the drive shaft 1, a swash plate 2 is fixed in a conventional manner. The swash plate 2 is about a bearing assembly 3, the rotational movement of the drive shaft 1 in an oscillating stroke movement. The lifting movement is transmitted to a mounted on the bearing assembly 3 piston rod 4.

Neben der Kolbenstange 4 sind noch weitere Kolbenstangen mit zugeordneten Lageranordnungen vorhanden; die nachfolgende Beschreibung ist also exemplarisch zu verstehen.In addition to the piston rod 4 further piston rods with associated bearing arrangements are available; The following description is thus to be understood as an example.

Die Kolbenstange 4 leitet die aufgrund der Drehung der Taumelscheibe 2 erzeugte Hin- und Herbewegung an einen Kolben 5 weiter, welcher an dem der Lageranordnung 3 gegenüberliegenden Ende der Kolbenstange 4 koaxial befestigt ist. Der Kolben 5 läuft innerhalb eines zugeordneten Zylinders 6, in welchem die Druckluft aufgrund der Bewegung des Kolbens 5 erzeugt wird. Eine Ansaugung von Luft aus der Atmosphäre folgt durch den Kolben 5 hindurch, welcher zu diesem Zwecke ein Rückschlagventil 7 besitzt. Die komprimierte Druckluft verlässt den Zylinder 6 über ein weiteres entsprechend gestaltetes Rückschlagventil 8 am Zylinderkopf 9, der am Ventilgehäuse 10 angebracht ist. Die Kolbenstange 4 wird über eine ortsfest zum Verdichtergehäuse 10 angeordnete Lagerbohrung 11 axial geführt.The piston rod 4 forwards the reciprocating motion generated due to the rotation of the swash plate 2 to a piston 5 which is fixed coaxially to the end of the piston rod 4 opposite the bearing assembly 3. The piston 5 runs within an associated cylinder 6, in which the compressed air due to the movement of the piston 5 is generated. A suction of air from the atmosphere follows through the piston 5, which has a check valve 7 for this purpose. The compressed compressed air leaves the cylinder 6 via another appropriately designed check valve 8 on the cylinder head 9, which is mounted on the valve housing 10. The piston rod 4 is guided axially via a stationary to the compressor housing 10 arranged bearing bore 11.

Zur Reduzierung der Gleitreibung zwischen Lageranordnung 3 und Taumelscheibe 2 ist letztere im Kontaktbereich zu der Lageranordnung 3 mit einer zusätzlichen Beschichtung 12 versehen.To reduce the sliding friction between the bearing assembly 3 and swash plate 2, the latter is provided in the contact region to the bearing assembly 3 with an additional coating 12.

Die Lageranordnung 3 besteht aus zwei halbkugelförmigen Lagersteinen 13a, 13b, die in jeweils korrespondierenden Lagerpfannen seitens einer U-förmigen Lagerbrücke 14 der Kolbenstange 4 verschwenkbar formschlüssig gehalten sind, so dass die jeweils geraden Lagerflächen der halbkugelförmigen Lagersteine 13a, 13b im außenradialen Randbereich an der Taumelscheibe 2 auf der Beschichtung 12 zur Anlage kommen. Das Gehäuse 10 weist Spritzölbohrungen 15 auf, aus welchen Öl gezielt und dosiert an die zu schmierenden Kontaktbereiche zwischen der Taumelscheibe 2 und der Lageranordnung 3 gelangt. Das Öl gelangt dabei indirekt ausgehend von der Spritzölbohrung 15 unter Beeinflussung durch die schnelle Rotation der Antriebswelle 1 an die zu schmierenden Kontaktbereiche.The bearing assembly 3 consists of two hemispherical bearing blocks 13a, 13b, which are held in each corresponding bearing cups by a U-shaped bearing bridge 14 of the piston rod 4 pivotally positively, so that the respective straight bearing surfaces of the hemispherical bearing blocks 13a, 13b in the outer radial edge region of the swash plate 2 come on the coating 12 to the plant. The housing 10 has spray oil bores 15 from which oil reaches the areas of contact to be lubricated between the swash plate 2 and the bearing arrangement 3 in a targeted and metered manner. The oil passes indirectly from the spray oil hole 15 under the influence of the rapid rotation of the drive shaft 1 to be lubricated contact areas.

Gemäß Fig.2 kommt bei diesem Einsatzbeispiel eine PTFE-Folie zur Anwendung, die auf die Oberfläche der Taumelscheibe 2 aufgebracht ist. Dabei ist die Taumelscheibe 2 nur an der dem - hier nicht weiter dargestellten - Kolben 5 zugewandten Seitenfläche mit der Beschichtung 12 zur Reduzierung der Gleitreibung versehen.According to Fig.2 In this application example, a PTFE film is used, which is applied to the surface of the swash plate 2. In this case, the swash plate 2 is provided only on the - not shown here - the piston 5 facing side surface with the coating 12 to reduce the sliding friction.

Eine derart beschichtete Taumelscheibe 2 eignet sich durchaus auch zum Einsatz in Verbindung mit einem ölgeschmierten Triebwerk eines Taumelscheibenverdichters.Such a coated swash plate 2 is also quite suitable for use in conjunction with an oil-lubricated engine of a swash plate compressor.

Weiterhin kann der Innenraum des Triebwerks von einem Kühlluftstrom durchströmt werden, um die aufgrund des Trockenlaufs entstehende Wärme nach außen hin abzuführen.Furthermore, the interior of the engine can be traversed by a flow of cooling air to dissipate the resulting due to the dry running heat to the outside.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Antriebswelledrive shaft
22
Taumelscheibeswash plate
33
Lageranordnungbearing arrangement
44
Kolbenstangepiston rod
55
Kolbenpiston
66
Zylindercylinder
77
Rückschlagventilcheck valve
88th
Rückschlagventilcheck valve
99
Zylinderkopfcylinder head
1010
Gehäusecasing
1111
Lagerbohrungbearing bore
1212
Beschichtung (PTFE)Coating (PTFE)
1313
LagersteinLagerstein
1414
Lagerbrückebearing bridge
1515
SpritzölbohrungOil-drilling

Claims (6)

  1. Dry running swashplate compressor, in particular for generating compressed air in commercial vehicles, with a swashplate (2) mounted on a drive shaft (1) for the conversion of the rotary drive movement into an oscillating stroking movement via a bearing arrangement (3) acting together with the outer radial edge region, wherein the swashplate (2) is provided with an additional coating (12) made of a PTFE material at least in the contact region towards the bearing arrangement (3) in order to reduce sliding friction,
    characterised in that the swashplate (2) is provided with the sliding friction-reducing coating (12) only on the side face adjacent to the piston (5), wherein the housing (10) is provided with oil spray bores (15) through which oil is supplied to the contact regions for the lubrication and the cooling of the contact regions between the swashplate (2) and the bearing arrangement (3).
  2. Dry running swashplate compressor according to claim 1,
    characterised in that a PFTE film is applied to the surface of the swashplate (2) for the application of the sliding friction-reducing coating (12).
  3. Dry running swashplate compressor according to any of the preceding claims,
    characterised in that the bearing arrangement (3) between the swashplate (2) and the piston rod (4) comprises two hemispherical bearing jewels (13a, 13b), which are pivotably and positively held in corresponding bushings on the side of a U-shaped bearing support (14) of the piston rod (4) and which come to bear against the straight bearing surfaces in the outer radial edge region of the swashplate (2).
  4. Dry running swashplate compressor according to claim 3,
    characterised in that the hemispherical bearing jewels (13a, 13b) are also provided with a sliding friction-reducing coating on the side of the straight bearing surface.
  5. Dry running swashplate compressor according to claim 3,
    characterised in that the hemispherical bearing jewels (13a, 13b) are completely made of a PTFE material.
  6. Dry running swashplate compressor according to any of the preceding claims,
    characterised in that a cooling airflow passes through the interior of the engine which surrounds the swashplate (2) to carry away the heat generated by dry running to the atmosphere.
EP05817800A 2004-12-20 2005-12-16 Dry running swashplate compressor comprising a coated swashplate Not-in-force EP1831551B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004061237A DE102004061237A1 (en) 2004-12-20 2004-12-20 Dry running swash plate compressor with a coated swash plate
PCT/EP2005/013601 WO2006066827A1 (en) 2004-12-20 2005-12-16 Dry running swashplate compressor comprising a coated swashplate

Publications (2)

Publication Number Publication Date
EP1831551A1 EP1831551A1 (en) 2007-09-12
EP1831551B1 true EP1831551B1 (en) 2008-10-08

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ID=35811720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05817800A Not-in-force EP1831551B1 (en) 2004-12-20 2005-12-16 Dry running swashplate compressor comprising a coated swashplate

Country Status (4)

Country Link
EP (1) EP1831551B1 (en)
AT (1) ATE410596T1 (en)
DE (2) DE102004061237A1 (en)
WO (1) WO2006066827A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9856866B2 (en) 2011-01-28 2018-01-02 Wabtec Holding Corp. Oil-free air compressor for rail vehicles
DE102017010095B4 (en) * 2016-11-01 2020-02-27 Hans Lütte Dry-running compressor with engine room through which suction gas flows

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10328120A1 (en) * 2002-06-24 2004-05-19 Kabushiki Kaisha Toyota Jidoshokki, Kariya sliding component

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE713155C (en) * 1940-01-18 1941-11-01 Hans Czerny Piston compressor with air cooling
EP0330674B1 (en) * 1987-01-02 1990-12-12 Ludwig Elsbett Internal-combustion engine
JP3085514B2 (en) * 1995-06-08 2000-09-11 株式会社豊田自動織機製作所 Compressor
DE19706066A1 (en) * 1997-02-17 1997-11-20 Hans Dipl Ing Unger Compressor providing compressed air in vehicle
JP2001263227A (en) * 2000-03-21 2001-09-26 Toyota Autom Loom Works Ltd Coating film forming method in swash plate of swash plate type compressor and swash plate therefor
JP2002039062A (en) * 2000-07-26 2002-02-06 Toyota Industries Corp Compressor
DE10214045B4 (en) * 2002-03-28 2015-07-16 Volkswagen Ag R 744 compressor for a vehicle air conditioning

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10328120A1 (en) * 2002-06-24 2004-05-19 Kabushiki Kaisha Toyota Jidoshokki, Kariya sliding component

Also Published As

Publication number Publication date
EP1831551A1 (en) 2007-09-12
DE502005005658D1 (en) 2008-11-20
WO2006066827A1 (en) 2006-06-29
ATE410596T1 (en) 2008-10-15
DE102004061237A1 (en) 2006-07-06

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