EP1831562A1 - Piston-cylinder arrangement for a reciprocating compressor - Google Patents

Piston-cylinder arrangement for a reciprocating compressor

Info

Publication number
EP1831562A1
EP1831562A1 EP05818221A EP05818221A EP1831562A1 EP 1831562 A1 EP1831562 A1 EP 1831562A1 EP 05818221 A EP05818221 A EP 05818221A EP 05818221 A EP05818221 A EP 05818221A EP 1831562 A1 EP1831562 A1 EP 1831562A1
Authority
EP
European Patent Office
Prior art keywords
piston
fastening
cylinder
cylinder arrangement
edge portion
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.)
Granted
Application number
EP05818221A
Other languages
German (de)
French (fr)
Other versions
EP1831562B1 (en
Inventor
Dieter Spurny
Dieter Weisse
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.)
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Original Assignee
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Knorr Bremse Systeme fuer Schienenfahrzeuge 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 Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH, Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH filed Critical Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Publication of EP1831562A1 publication Critical patent/EP1831562A1/en
Application granted granted Critical
Publication of EP1831562B1 publication Critical patent/EP1831562B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0878—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
    • 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
    • F04B39/0005—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 adaptations of 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
    • 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
    • F04B39/0005—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 adaptations of pistons
    • F04B39/0022—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 adaptations of pistons piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/144—Adaptation of piston-rods
    • F04B53/147—Mounting or detaching of piston rod

Definitions

  • the present invention relates to a piston-cylinder arrangement for a
  • Piston compressor in particular for a swash plate compressor, with a cylinder arranged in an axially movable piston made of light metal, which is fastened via at least one in the piston movement direction through a through bore of the piston extending through fastening screw frontally on a piston rod.
  • the field of application of the present invention relates primarily to swash plate compressors, which represent a special form of reciprocating compressors for generating compressed air.
  • Swash plate compressors are used, for example, in commercial vehicles. In commercial vehicles, these are usually driven directly by the engine of the commercial vehicle and supply the compressed air supply of the compressed air vehicle electrical system. In commercial vehicles, the compressed air thus generated is used for example for operating a compressed air brake system.
  • EP 0 859 151 A2 discloses a swash plate compressor for generating compressed air in commercial vehicles, which is constructed here to run dry as far as possible.
  • This 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 motion. From the bearing arrangement extending piston rods to various pistons, which generate the compressed air by a reciprocating motion in associated cylinders.
  • a plurality of pistons are arranged adjacent to one another on a circumferential circle, in order to realize the highest possible delivery rate of the swash plate compressor.
  • the usually made of a light metal piston are equipped with suitable for oil-free dry running piston rings, so that the piston moves without contact in the cylinder bore.
  • the fastening of the light metal existing piston on the piston rod takes place here via a central fastening screw, which is coaxial with the piston rod and the longitudinal axis of the piston and comes into engagement with a corresponding threaded base bore on the piston facing the end face of the piston rod.
  • the piston is provided with a through hole.
  • an interposed washer is provided here.
  • a disadvantage of this prior art solution is that the head of the fastening screw protrudes beyond the piston surface, so that a corresponding recess for receiving the head of the fastening screw is required on the part of the cylinder. Furthermore, the hot, compressed air flows around the head of the
  • US 3,036,873 shows another solution for fixing a piston rod to the piston, in which the head of the fastening screw does not protrude beyond the piston surface by being housed in a corresponding countersinking of the piston.
  • a washer assembly in two Execution, each consisting of a spring washer and a steel disc provided. This solution proves to be quite expensive to manufacture and assembly because of the many items.
  • the invention includes the technical teaching that the through hole of the piston has a countersink, wherein a fastening bush is provided with an annular bottom portion and an adjacent hollow-cylindrical wall portion which projects into the countersink of the through hole for receiving the head of the fastening screw, and via a adjoining the wall region of the fastening bushing and extending radially outwardly edge region abuts the adjacent piston surface.
  • the advantage of the solution according to the invention is, in particular, that it is hereby possible to completely countersink the head of the fastening screw. A supernatant is thus largely avoided.
  • a sinking of the mounting screw in the material of the piston would not be possible because the required material thicknesses of the existing light metal piston would not ensure reliable attachment.
  • the fastening screw does not heat up so much that the temperature differences associated therewith are no longer significant, and unwanted alternating voltages no longer occur. Rather, the connection point to the piston rod is thermally relieved by the cheaper compressed air supply.
  • the mounting bush receiving reduction in the piston in the depth is made larger than the axial length of the mounting sleeve, so that an axial tolerance compensation takes place by tightening the mounting screw. Manufacturing-related component tolerances on the piston can thus be compensated in a simple manner while securing the screw.
  • the fastening bushing can also be used for clamping at least one suction lamella on the piston by clamping the tongue-like suction lamella between the surface of the piston and the edge portion of the fastening bushing. Since the mounting bushing takes on a further function in this case, can be dispensed with separate attachment means for the Sauglamelle.
  • the suction lamella acts at this point as a check valve when sucking in the compressed air. The sucked in compressed air is in this respect conveyed through the piston into the pressure chamber and compressed here.
  • edge portion of the mounting bushing tapers in the thickness to create an opening angle for limiting the movement of the suction blade clamped here.
  • the edge portion has an outer radial, rounded rolling edge.
  • the rounded rolling edge serves to avoid fractures of the here clamped at least one suction lamella. Without this measure, the Danger that the suction plate is so bent due to the alternating stress occurring at the clamping point to the fastening bushing due to the opening and closing of the check valve that here a break occurs over time.
  • the radially outwardly extending edge section of the fastening bushing should be arranged at an angle of ⁇ 90 ° to the hollow-cylindrical, adjacent wall section.
  • Tolerance compensation allows, as the resilient edge area acts as a kind of spring washer. If the mounting bushing also serve for the clamping attachment of suction blades, the opening angle is ensured by the resilient edge portion.
  • the existing steel mounting bushing is made by deep drawing, stamping and punching.
  • this can be production technology produce in a very simple way.
  • the mounting bushing has a thickness of 0.3 to 1.5 millimeters, preferably 0.5 to 1 millimeter, when used within a swash plate type compressor of conventional sizes. This relatively small thickness is sufficient to produce the advantages of the invention.
  • the transition between the annular bottom portion to the adjacent cylindrical wall portion should be provided as well as the transition between the hollow cylindrical wall portion to the annular edge portion with a radius in the range of 0.5 to 1 millimeter. Radii in this range are sufficient to prevent cracking in the manufacture of the mounting bushing (deep drawing). 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.l a piston-cylinder unit of a swash plate compressor
  • FIG. 2 shows a mounting bushing for fastening the piston to the piston rod of the piston-cylinder unit of FIG. 1 in the non-installed state
  • FIG. 3 shows the mounting bushing of FIG. 1 in the installed state.
  • the piston-cylinder arrangement shown here consists of a cylinder 1, in which a piston 2 is arranged axially back and forth movable.
  • the piston 2 is made of aluminum here.
  • the piston 2 is provided with an outer radial piston ring assembly 3 which is in contact with the inner wall of the cylinder 2.
  • the piston 2 has a central through-bore 4, through which a fastening screw 5 extends. By means of the fastening screw 5 takes place a coaxial attachment of the piston 2 frontally on a piston rod 6.
  • the piston rod 6 transmits an axial movement of the engine of the - not shown here - swash plate compressor.
  • the serving for receiving the fastening screw 5 through hole 4 in the piston 2 is provided with a reduction.
  • the countersink serves to receive a fastening bushing 7, which acts between the piston 2 and the fastening screw 5.
  • the mounting bushing 7 is made of steel and thus supports the connection point between the fastening screw 5 and the piston 2 made of aluminum.
  • the fastening bushing 7 also serves to clamp at least one suction lamella 8 on the piston 2. This clamping attachment is achieved by clamping the suction lamella 8 between the piston surface 9 and the fastening bushing 7.
  • the suction blade 8 forms with a corresponding eccentric through hole 10 in Piston 2, a check valve, which serves to suck in air from the atmosphere through the piston. After compression of the air sucked in this way, it is discharged via an outlet valve 11 arranged on the front side of the cylinder.
  • the fastening bushing 7 consists of an annular
  • the mounting bush 7 of this embodiment is made of sheet steel having a thickness of 0.7 millimeters.
  • the transition between the annular bottom portion 12 to the adjacent cylindrical wall portion 13 as well as the transition between the hollow cylindrical wall portion 13 is provided to the annular edge portion 14 with a radius of 0.6 millimeters.
  • the mounting bush 7 receiving reduction in the piston 2 in the depth is made larger than the axial length of the mounting sleeve 7 in the relaxed state.
  • the edge portion 14 of the mounting bush 7 is tapered in thickness to create a ⁇ ffhungswinkel 17 to limit the movement of the here clamped suction plate 8.
  • the fastening bushing 7 thus serves, in addition to an improvement of the screw connection, also as a clamp fastening of the at least one suction lamella 8 on the piston 2.
  • the invention is not limited to the above-mentioned preferred exemplary embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Compressor (AREA)

Abstract

Disclosed is a piston-cylinder arrangement for a reciprocating compressor, especially a swashplate compressor, comprising a light metal piston (2) which is axially movable within a cylinder (1) and the face of which is fixed to a piston rod (6) via at least one fastening screw (5) that extends through a through-bore (4) of the piston (2) in the direction of travel of the piston. The inventive piston-cylinder arrangement is characterized in that the through-bore (4) of the piston (2) is provided with a recess while a fastening bush (7) encompassing an annular bottom section (12) and an adjacent hollow cylinder-type wall section (13) is provided. Said fastening bush (7) protrudes into the recess of the through-bore (4) in order to accommodate the head of the fastening screw (5) while resting against the adjacent piston area (9) via a radially outward extending peripheral section (14) which adjoins the wall section (13) of the fastening bush (7).

Description

Kolben-Zylinder- Anordnung für einen Kolbenverdichter Piston-cylinder arrangement for a reciprocating compressor
Die vorliegende Erfindung betrifft eine Kolben-Zylinder-Anordnung für einenThe present invention relates to a piston-cylinder arrangement for a
Kolbenverdichter, insbesondere für einen Taumelscheibenverdichter, mit einem in einem Zylinder angeordneten axial bewegbaren Kolben aus Leichtmetall, der über mindestens eine in Kolbenbewegungsrichtung durch eine Durchgangsbohrung des Kolbens hindurch verlaufende Befestigungsschraube stirnseitig an einer Kolbenstange befestigt ist.Piston compressor, in particular for a swash plate compressor, with a cylinder arranged in an axially movable piston made of light metal, which is fastened via at least one in the piston movement direction through a through bore of the piston extending through fastening screw frontally on a piston rod.
Das Einsatzgebiet der vorliegenden Erfindung bezieht sich vornehmlich auf Taumelscheibenverdichter, welche eine Spezialform von Kolbenverdichtern zur Erzeugung von Druckluft darstellen.The field of application of the present invention relates primarily to swash plate compressors, which represent a special form of reciprocating compressors for generating compressed air.
Taumelscheibenverdichter kommen beispielsweise bei Nutzfahrzeugen zur Anwendung. In Nutzfahrzeugen werden diese meist direkt über den Motor des Nutzfahrzeugs angetrieben und liefern die Druckluftzuspeisung des Druckluft-Bordnetzes. Bei Nutzfahrzeugen wird die so erzeugte Druckluft beispielsweise zum Betrieb einer Druckluft-Bremsanlage genutzt.Swash plate compressors are used, for example, in commercial vehicles. In commercial vehicles, these are usually driven directly by the engine of the commercial vehicle and supply the compressed air supply of the compressed air vehicle electrical system. In commercial vehicles, the compressed air thus generated is used for example for operating a compressed air brake system.
Aus der EP 0 859 151 A2 geht ein Taumelscheibenverdichter zur Drucklufterzeugung in Nutzfahrzeugen hervor, welcher hier weitestgehend trockenlaufend konstruiert ist. Dieser 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 zur Übertragung der Drehbewegung in eine oszillierende Bewegung bilden. Von der Lageanordnung aus verlaufen Kolbenstangen zu diversen Kolben, welche durch eine Hin- und Herbewegung in zugeordneten Zylindern die Druckluft erzeugen. Hierbei sind mehrere Kolben auf einem Umfangskreis benachbart zueinander angeordnet, um eine möglichst hohe Förderleistung des Taumelscheibenverdichters zu realisieren. Die gewöhnlich aus einem Leichtmetall bestehenden Kolben sind mit für den ölfreien Trockenlauf geeigneten Kolbenringen bestückt, so dass der Kolben sich berührungsfrei in der Zylinderbohrung bewegt. Die Befestigung des aus Leichtmetall bestehenden Kolbens an der Kolbenstange erfolgt hier über eine zentrale Befestigungsschraube, welche koaxial zur Kolbenstange sowie zur Längsachse des Kolbens verläuft und in eine korrespondierende Gewindegrundbohrung an der dem Kolben zugewandten Stirnseite der Kolbenstange zum Eingriff kommt. Zu diesem Zwecke ist der Kolben mit einer Durchgangsbohrung versehen. Um einen Materialabtrag von der druckkammerseitigen Kolbenfläche beim Festziehen der Befestigungsschraube zu vermeiden, ist hier eine dazwischen angeordnete Unterlegscheibe vorgesehen.EP 0 859 151 A2 discloses a swash plate compressor for generating compressed air in commercial vehicles, which is constructed here to run dry as far as possible. This 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 motion. From the bearing arrangement extending piston rods to various pistons, which generate the compressed air by a reciprocating motion in associated cylinders. In this case, a plurality of pistons are arranged adjacent to one another on a circumferential circle, in order to realize the highest possible delivery rate of the swash plate compressor. The usually made of a light metal piston are equipped with suitable for oil-free dry running piston rings, so that the piston moves without contact in the cylinder bore. The fastening of the light metal existing piston on the piston rod takes place here via a central fastening screw, which is coaxial with the piston rod and the longitudinal axis of the piston and comes into engagement with a corresponding threaded base bore on the piston facing the end face of the piston rod. For this purpose, the piston is provided with a through hole. In order to avoid a removal of material from the pressure-chamber-side piston surface when tightening the fastening screw, an interposed washer is provided here.
Ein Nachteil dieser Lösung des Standes der Technik besteht darin, dass der Kopf der Befestigungsschraube über die Kolbenfläche hervorsteht, so dass seitens des Zylinders eine korrespondierende Ausnehmung zur Aufnahme des Kopfes der Befestigungsschraube erforderlich ist. Weiterhin strömt die heiße, verdichtete Druckluft um den Kopf derA disadvantage of this prior art solution is that the head of the fastening screw protrudes beyond the piston surface, so that a corresponding recess for receiving the head of the fastening screw is required on the part of the cylinder. Furthermore, the hot, compressed air flows around the head of the
Befestigungsschraube herum, um schließlich aus dem Zylinder auszuströmen. Hierdurch kommt es zu einer extremen Aufheizung der Befestigungsschraube, so dass die Verbindungsstelle zwischen der Befestigungsschraube und der Kolbenstange durch die herrschenden Temperaturunterschiede unerwünschten Wechselspannungen ausgesetzt ist.Fixing screw around to finally flow out of the cylinder. This results in an extreme heating of the fastening screw, so that the connection point between the fastening screw and the piston rod is exposed by the prevailing temperature differences undesirable AC voltages.
Aus der DE 299 06 232 Ul geht ein Kolbenverdichter hervor, dessen Kolbenstange in eine Gewindegrundbohrung des Kolbens eingeschraubt ist. Diese Lösung vermeidet, dass der Kopf der Befestigungsschraube über die Kolbenfläche hervorsteht. Allerdings ist die untere Kolbenfläche hierfür mit Verstärkungsrippen zu verstärken.From DE 299 06 232 Ul a piston compressor is apparent, the piston rod is screwed into a threaded base bore of the piston. This solution avoids the head of the fastening screw protruding beyond the piston surface. However, the lower piston surface is to reinforce this with reinforcing ribs.
Die US 3,036,873 zeigt eine andere Lösung zur Befestigung einer Kolbenstange am Kolben, bei welcher der Kopf der Befestigungsschraube nicht über die Kolbenfläche hervorsteht, indem diese in einer korrespondierenden Senkung des Kolbens untergebracht ist. Zur Sicherung der Schraub Verbindung ist eine Unterlegscheibenanordnung in zweifacher Ausführung, bestehend je aus einer Federscheibe und einer Stahlscheibe, vorgesehen. Diese Lösung erweist sich wegen der vielen Einzelteile recht aufwendig in der Herstellung und Montage.US 3,036,873 shows another solution for fixing a piston rod to the piston, in which the head of the fastening screw does not protrude beyond the piston surface by being housed in a corresponding countersinking of the piston. To secure the screw connection is a washer assembly in two Execution, each consisting of a spring washer and a steel disc provided. This solution proves to be quite expensive to manufacture and assembly because of the many items.
Es ist daher die Aufgabe der vorliegenden Erfindung eine Kolben-Zylinder- Anordnung der vorstehend beschriebenen Art dahingehend weiter zu verbessern, dass mittels mindestens einer Befestigungsschraube eine zuverlässige Schraubverbindung des Kolbens an der Kolbenstange mit einfachen technischen Maßnahmen realisierbar ist.It is therefore an object of the present invention to further improve a piston-cylinder arrangement of the type described above to the extent that by means of at least one fastening screw a reliable screw of the piston on the piston rod can be realized with simple technical measures.
Die Aufgabe wird ausgehend von einer Kolben-Zylinder- Anordnung 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 piston-cylinder arrangement 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 Durchgangsbohrung des Kolbens eine Senkung aufweist, wobei eine Befestigungsbuchse mit einem kreisringförmigen Bodenabschnitt und einem benachbarten hohlzylinderartigen Wandabschnitt vorgesehen ist, die in die Senkung der Durchgangsbohrung zur Aufnahme des Kopfes der Befestigungsschraube hineinragt, und die über einen sich dem Wandbereich der Befestigungsbuchse anschließenden und nach radial außen hin erstreckenden Randbereich an der benachbarten Kolbenfläche zur Anlage kommt.The invention includes the technical teaching that the through hole of the piston has a countersink, wherein a fastening bush is provided with an annular bottom portion and an adjacent hollow-cylindrical wall portion which projects into the countersink of the through hole for receiving the head of the fastening screw, and via a adjoining the wall region of the fastening bushing and extending radially outwardly edge region abuts the adjacent piston surface.
Der Vorteil der erfindungsgemäßen Lösung besteht insbesondere darin, dass es hiermit möglich wird, den Kopf der Befestigungsschraube vorzugsweise vollständig zu versenken. Ein Überstand wird somit weitestgehend vermieden. Ohne die erfindungsgemäß ausgebildete Befestigungsbuchse wäre ein Versenken der Befestigungsschraube im Material des Kolbens nicht möglich, da die erforderlichen Materialstärken des aus Leichtmetall bestehenden Kolbens eine zuverlässige Befestigung nicht sicherstellen würden. Erst durch die zusätzliche Befestigungsbuchse, welche vorzugsweise aus Stahl besteht, ist es möglich, den Kopf der Befestigungsschraube zu versenken und eine günstige Druckluftführung im Verdichtungsraum darzustellen. Die heiße, verdichtete Druckluft muss nicht mehr am Kopf der Befestigungsschraube vorbei ausströmen. Die Befestigungsschraube erwärmt sich also nicht mehr so stark, so dass die hiermit im Zusammenhang stehenden Temperaturunterschiede nicht mehr ins Gewicht fallen, und unerwünschte Wechselspannungen nicht mehr auftreten. Vielmehr wird die Verbindungsstelle zur Kolbenstange hin durch die günstigere Druckluftführung thermisch entlastet.The advantage of the solution according to the invention is, in particular, that it is hereby possible to completely countersink the head of the fastening screw. A supernatant is thus largely avoided. Without the inventively designed mounting bush a sinking of the mounting screw in the material of the piston would not be possible because the required material thicknesses of the existing light metal piston would not ensure reliable attachment. Only through the additional mounting bush, which is preferably made of steel, it is possible to sink the head of the mounting screw and a favorable compressed air guide in Represent compression space. The hot, compressed compressed air no longer has to flow past the head of the fastening screw. Thus, the fastening screw does not heat up so much that the temperature differences associated therewith are no longer significant, and unwanted alternating voltages no longer occur. Rather, the connection point to the piston rod is thermally relieved by the cheaper compressed air supply.
Vorteilhafter Weise ist vorgesehen, dass die die Befestigungsbuchse aufnehmende Senkung im Kolben in der Tiefe größer ausgeführt ist als die axiale Länge der Befestigungsbuchse, so dass durch Anziehen der Befestigungsschraube ein axialer Toleranzausgleich erfolgt. Fertigungsbedingte Bauteiltoleranzen am Kolben können somit in einfacher Weise bei gleichzeitiger Sicherung der Schraubverbindung ausgeglichen werden.Advantageously, it is provided that the mounting bush receiving reduction in the piston in the depth is made larger than the axial length of the mounting sleeve, so that an axial tolerance compensation takes place by tightening the mounting screw. Manufacturing-related component tolerances on the piston can thus be compensated in a simple manner while securing the screw.
Gemäß einer die Erfindung verbessernden Maßnahme kann die Befestigungsbuchse daneben auch zur Klemmbefestigung mindestens einer Sauglamelle am Kolben durch Einspannen der zungenartigen Sauglamelle zwischen der Oberfläche des Kolbens und dem Randabschnitt der Befestigungsbuchse verwendet werden. Da die Befestigungsbuchse in diesem Fall eine weitere Funktion übernimmt, kann auf separate Befestigungsmittel für die Sauglamelle verzichtet werden. Die Sauglamelle wirkt an dieser Stelle als Rückschlagventil beim Ansaugen der Druckluft. Die angesaugte Druckluft wird insoweit durch den Kolben hindurch in den Druckraum gefördert und hier komprimiert.According to a measure improving the invention, the fastening bushing can also be used for clamping at least one suction lamella on the piston by clamping the tongue-like suction lamella between the surface of the piston and the edge portion of the fastening bushing. Since the mounting bushing takes on a further function in this case, can be dispensed with separate attachment means for the Sauglamelle. The suction lamella acts at this point as a check valve when sucking in the compressed air. The sucked in compressed air is in this respect conveyed through the piston into the pressure chamber and compressed here.
In diesem Zusammenhang ist gemäß einer weiteren die Erfindung verbessernden Maßnahme vorgesehen, dass der Randabschnitt der Befestigungsbuchse in der Dicke sich verjüngend ausläuft, um einen Öffnungswinkel zur Bewegungsbegrenzung der hier eingespannten Sauglamelle zu schaffen.In this context, it is provided according to a further measure improving the invention that the edge portion of the mounting bushing tapers in the thickness to create an opening angle for limiting the movement of the suction blade clamped here.
Weiterhin ist es von Vorteil, wenn der Randabschnitt eine außenradiale, abgerundete Abrollkante aufweist. Die abgerundete Abrollkante dient einer Vermeidung von Brüchen der hier eingespannten mindestens einen Sauglamelle. Ohne diese Maßnahme bestünde die Gefahr, dass die Sauglamelle aufgrund der durch das Öffnen und Schließen des Rückschlagventils auftretenden Wechselbeanspruchung an der Einspannstelle zur Befestigungsbuchse hin derart geknickt wird, dass hier im laufe der Zeit eine Bruchstelle entsteht.Furthermore, it is advantageous if the edge portion has an outer radial, rounded rolling edge. The rounded rolling edge serves to avoid fractures of the here clamped at least one suction lamella. Without this measure, the Danger that the suction plate is so bent due to the alternating stress occurring at the clamping point to the fastening bushing due to the opening and closing of the check valve that here a break occurs over time.
Gemäß einer weiteren, die Erfindung verbessernden Maßnahme sollte der sich nach radial außen hin erstreckende Randabschnitt der Befestigungsbuchse unter einem Winkel von < 90° zu dem hohlzylindrischen, benachbarten Wandabschnitt angeordnet sein. Hierdurch wird eine axiale Federwirkung der Befestigungsbuchse beim Anziehen der Befestigungsschraube gewährleistet, was die Schraubverbindung zusätzlich sichert und den axialenAccording to a further measure improving the invention, the radially outwardly extending edge section of the fastening bushing should be arranged at an angle of <90 ° to the hollow-cylindrical, adjacent wall section. As a result, an axial spring action of the fastening bush is ensured when tightening the fastening screw, which additionally secures the screw and the axial
Toleranzausgleich ermöglicht, da der federnde Randbereich als eine Art Federscheibe wirkt. Sollte die Befestigungsbuchse gleichzeitig auch der Klemmbefestigung von Sauglamellen dienen, so ist durch den federnden Randabschnitt der Öffnungswinkel sichergestellt.Tolerance compensation allows, as the resilient edge area acts as a kind of spring washer. If the mounting bushing also serve for the clamping attachment of suction blades, the opening angle is ensured by the resilient edge portion.
Vorzugsweise ist die aus Stahl bestehende Befestigungsbuchse durch Tiefziehen, Prägen und Stanzen hergestellt. Somit lässt diese sich fertigungstechnisch in denkbar einfacher Weise produzieren.Preferably, the existing steel mounting bushing is made by deep drawing, stamping and punching. Thus, this can be production technology produce in a very simple way.
Es ist ausreichend, wenn die Befestigungsbuchse bei Anwendung innerhalb eines Taumelscheibenverdichters üblicher Größen eine Dicke von 0,3 bis 1 ,5 Millimeter, vorzugsweise 0,5 bis 1 Millimeter aufweist. Diese relativ geringe Dicke ist ausreichend, um die erfϊndungsgemäßen Vorteile hervorzurufen. Insbesondere in diesem Dickebereich sollte der Übergang zwischen dem kreisringförmigen Bodenabschnitt zu dem benachbarten zylindrischen Wandabschnitt genauso wie der Übergang zwischen dem hohlzylindrischen Wandabschnitt zu dem kreisringförmigen Randabschnitt mit einem Radius im Bereich von 0,5 bis 1 Millimeter versehen sein. Radien in diesem Bereich sind hinreichend, um eine Rissbildung bei der Herstellung der Befestigungsbuchse (Tiefziehen) zu vermeiden. Weiter die Erfindung verbessernden Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher dargestellt. Es zeigt:It is sufficient if the mounting bushing has a thickness of 0.3 to 1.5 millimeters, preferably 0.5 to 1 millimeter, when used within a swash plate type compressor of conventional sizes. This relatively small thickness is sufficient to produce the advantages of the invention. In particular, in this thickness range, the transition between the annular bottom portion to the adjacent cylindrical wall portion should be provided as well as the transition between the hollow cylindrical wall portion to the annular edge portion with a radius in the range of 0.5 to 1 millimeter. Radii in this range are sufficient to prevent cracking in the manufacture of the mounting bushing (deep drawing). 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.l eine Kolben-Zylinder-Einheit eines Taumelscheibenverdichters,Fig.l a piston-cylinder unit of a swash plate compressor,
Fig.2 eine Befestigungsbuchse zur Befestigung des Kolbens an der Kolbenstange der Kolben-Zylinder-Einheit nach Fig. 1 im nicht-eingebauten Zustand, und2 shows a mounting bushing for fastening the piston to the piston rod of the piston-cylinder unit of FIG. 1 in the non-installed state, and
Fig.3 die Befestigungsbuchse nach Fig. 1 im eingebauten Zustand.3 shows the mounting bushing of FIG. 1 in the installed state.
Gemäß Fig.l besteht die hier dargestellte Kolben-Zylinder- Anordnung aus einem Zylinder 1, in welchem ein Kolben 2 axial hin- und her bewegbar angeordnet ist. Der Kolben 2 besteht hier aus Aluminium. Der Kolben 2 ist mit einer außenradialen Kolbenringanordnung 3 versehen, welche mit der Innenwandung des Zylinders 2 in Kontakt steht. Der Kolben 2 weist eine zentrale Durchgangsbohrung 4 auf, durch welche sich eine Befestigungsschraube 5 erstreckt. Mittels der Befestigungsschraube 5 erfolgt eine koaxiale Befestigung des Kolbens 2 stirnseitig an einer Kolbenstange 6. Die Kolbenstange 6 überträgt eine axiale Bewegung seitens des Triebwerks des - hier nicht weiter dargestellten - Taumelscheibenverdichters.According to Fig.l the piston-cylinder arrangement shown here consists of a cylinder 1, in which a piston 2 is arranged axially back and forth movable. The piston 2 is made of aluminum here. The piston 2 is provided with an outer radial piston ring assembly 3 which is in contact with the inner wall of the cylinder 2. The piston 2 has a central through-bore 4, through which a fastening screw 5 extends. By means of the fastening screw 5 takes place a coaxial attachment of the piston 2 frontally on a piston rod 6. The piston rod 6 transmits an axial movement of the engine of the - not shown here - swash plate compressor.
Die zur Aufnahme der Befestigungsschraube 5 dienende Durchgangsbohrung 4 im Kolben 2 ist mit einer Senkung versehen. Die Senkung dient der Aufnahme einer Befestigungsbuchse 7, welche zwischen dem Kolben 2 und der Befestigungsschraube 5 wirkt. Die Befestigungsbuchse 7 besteht aus Stahl und unterstützt insoweit die Verbindungsstelle zwischen der Befestigungsschraube 5 und dem aus Aluminium bestehenden Kolben 2.The serving for receiving the fastening screw 5 through hole 4 in the piston 2 is provided with a reduction. The countersink serves to receive a fastening bushing 7, which acts between the piston 2 and the fastening screw 5. The mounting bushing 7 is made of steel and thus supports the connection point between the fastening screw 5 and the piston 2 made of aluminum.
Daneben dient die Befestigungsbuchse 7 auch einer Klemmbefestigung mindestens einer Sauglamelle 8 am Kolben 2. Diese Klemmbefestigung wird durch Einspannen der Sauglamelle 8 zwischen der Kolbenfläche 9 und der Befestigungsbuchse 7 erzielt. Die Sauglamelle 8 bildet mit einer korrespondierenden außermittigen Durchgangsbohrung 10 im Kolben 2 ein Rückschlagventil, welches einem Ansaugen von Luft aus der Atmosphäre durch den Kolben hindurch dient. Nach Komprimierung der so angesaugten Luft wird diese über ein stirnseitig am Zylinder angeordnetes Auslassventil 11 abgegeben.In addition, the fastening bushing 7 also serves to clamp at least one suction lamella 8 on the piston 2. This clamping attachment is achieved by clamping the suction lamella 8 between the piston surface 9 and the fastening bushing 7. The suction blade 8 forms with a corresponding eccentric through hole 10 in Piston 2, a check valve, which serves to suck in air from the atmosphere through the piston. After compression of the air sucked in this way, it is discharged via an outlet valve 11 arranged on the front side of the cylinder.
Gemäß Fig.2 besteht die Befestigungsbuchse 7 aus einem kreisringförmigenAccording to Figure 2, the fastening bushing 7 consists of an annular
Bodenabschnitt 12, dem sich ein benachbarter hohlzylinderartiger Wandabschnitt 13 anschießt. Dem hohlzylinderartigen Wandabschnitt 13 wiederum schließt sich ein sich nach radial außen hin streckender Randabschnitt 14 an. Über den Randabschnitt 14 kommt die Befestigungsbuchse 7 an der Kolbenfläche 9 des Kolbens 2 zur Anlage. Der Randabschnitt 14 verläuft unter einem Winkel von < 90° zu dem hohlzylindrischen Wandabschnitt 13. Beim Festziehen der Befestigungsschraube 5 ergibt sich hieraus eine axiale Federwirkung zum Toleranzausgleich und zur Sicherung der Befestigungsschraube 5. Der Randabschnitt 14 der Befestigungsschraube 5 läuft weiterhin in der Dicke in eine Verjüngung 15 aus. Zur Vermeidung von Brüchen der hier eingespannten Sauglamelle 8 weist der Randabschnitt 14 außerdem eine außenradiale abgerundete Abrollkante 16 auf.Bottom portion 12, which an adjacent hollow cylinder-like wall portion 13 shoots. The hollow cylinder-like wall section 13, in turn, is adjoined by an edge section 14 which extends radially outward. About the edge portion 14, the mounting bush 7 comes to the piston surface 9 of the piston 2 to the plant. The tightening of the fastening screw 5 results in an axial spring action for tolerance compensation and securing the fastening screw 5. The edge portion 14 of the fastening screw 5 continues to run in thickness in one Rejuvenation 15 off. To avoid fractures of the here clamped suction plate 8, the edge portion 14 also has an outside radial rounded rolling edge 16.
Die Befestigungsbuchse 7 dieses Ausführungsbeispiels besteht aus Stahlblech mit einer Dicke von 0,7 Millimetern. Hiermit korrespondierend ist der Übergang zwischen dem kreisringförmigen Bodenabschnitt 12 zu dem benachbarten zylindrischen Wandabschnitt 13 genauso wie der Übergang zwischen dem hohlzylindrischen Wandabschnitt 13 zu dem kreisringförmigen Randabschnitt 14 mit einem Radius von 0,6 Millimetern versehen.The mounting bush 7 of this embodiment is made of sheet steel having a thickness of 0.7 millimeters. Correspondingly, the transition between the annular bottom portion 12 to the adjacent cylindrical wall portion 13 as well as the transition between the hollow cylindrical wall portion 13 is provided to the annular edge portion 14 with a radius of 0.6 millimeters.
Nach Fig. 3 ist die die Befestigungsbuchse 7 aufnehmende Senkung im Kolben 2 in der Tiefe größer ausgeführt ist als die axiale Länge der Befestigungsbuchse 7 im entspannten Zustand. Durch Anziehen der Befestigungsschraube 5 erfolgt dann ein axialer Toleranzausgleich, indem der Randbereich 14 einfedert. Der Randabschnitt 14 der Befestigungsbuchse 7 läuft in der Dicke sich verjüngend aus, um einen Öffhungswinkel 17 zur Bewegungsbegrenzung der hier eingespannten Sauglamelle 8 zu schaffen. Die Befestigungsbuchse 7 dient somit neben einer Verbesserung der Schraub Verbindung hier auch als Klemmbefestigung der mindestens einen Sauglamelle 8 am Kolben 2. Die Erfindung beschränkt sich nicht auf das vorstehend angegebene bevorzugte Ausfuhrungsbeispiel. Es sind vielmehr auch Abhandlungen hiervon denkbar, welche vom Schutzbereich der nachfolgenden Ansprüche umfasst sind. So ist es beispielsweise auch möglich, die Befestigungsbuchse aus einem mehr oder weniger starken Stahlblech mit an die Blechdecke angepassten Radien herzustellen. Dieses ist lediglich eine Dimensionierungsfrage, welche von den geometrischen Abmessungen der Kolben-Zylinder- Anordnung abhängt. According to Fig. 3, the mounting bush 7 receiving reduction in the piston 2 in the depth is made larger than the axial length of the mounting sleeve 7 in the relaxed state. By tightening the fastening screw 5 is then carried out an axial tolerance compensation by the edge portion 14 springs. The edge portion 14 of the mounting bush 7 is tapered in thickness to create a Öffhungswinkel 17 to limit the movement of the here clamped suction plate 8. The fastening bushing 7 thus serves, in addition to an improvement of the screw connection, also as a clamp fastening of the at least one suction lamella 8 on the piston 2. The invention is not limited to the above-mentioned preferred exemplary embodiment. On the contrary, it is also possible to devise therefrom articles which are covered by the scope of protection of the following claims. For example, it is also possible to produce the fastening bushing from a more or less strong steel sheet with radii adapted to the metal ceiling. This is merely a dimensioning issue, which depends on the geometric dimensions of the piston-cylinder arrangement.
B ez ugs z eichen listeB ez ugs list
1 Zylinder1 cylinder
2 Kolben2 pistons
3 Kolbenringanordnung3 piston ring arrangement
4 Durchgangsbohrung4 through hole
5 Befestigungsschraube 6 Kolbenstange5 fixing screw 6 piston rod
7 Befestigungsbuchse7 fixing bush
8 Sauglamelle8 suction lamella
9 Kolbenfläche9 piston area
10 Durchgangsbohrung 11 Auslassventil10 Through hole 11 Outlet valve
12 Bodenabschnitt12 floor section
13 Wandabschnitt13 wall section
14 Randabschnitt14 edge section
15 Verjüngung 16 Abrollkante15 Rejuvenation 16 Rolling edge
17 Öffhungswinkel 17 opening angle

Claims

A n s p r ü c h e Claims
1. Kolben-Zylinder- Anordnung für einen Kolbenverdichter, insbesondere für einen Taumelscheibenverdichter, mit einem in einem Zylinder (1) axial bewegbaren Kolben (2) aus Leichtmetall, der über mindestens eine in Kolbenbewegungsrichtung durch eine1. piston-cylinder arrangement for a reciprocating compressor, in particular for a swash plate compressor, with a in a cylinder (1) axially movable piston (2) made of light metal, the at least one in the piston movement direction by a
Durchgangsbohrung (4) des Kolbens (2) hindurch verlaufende Befestigungsschraube (5) stirnseitig an einer Kolbenstange (6) befestigt ist, dadurch gekennzeichnet, dass die Durchgangsbohrung (4) des Kolbens (2) eine Senkung aufweist, wobei eine Befestigungsbuchse (7) mit einem kreisringförmigen Bodenabschnitt (12) und einem benachbarten hohlzylinderartigen Wandabschnitt (13) vorgesehen ist, die in die Senkung der Durchgangsbohrung (4) zur Aufnahme des Kopfes der Befestigungsschraube (5) hineinragt, und die über einen sich dem Wandabschnitt (13) der Befestigungsbuchse (7) anschließenden und nach Radialaußen hin erstreckenden Randabschnitt (14) an der benachbarten Kolbenfläche (9) zur Anlage kommt.Through hole (4) of the piston (2) extending through fastening screw (5) is attached to the end face of a piston rod (6), characterized in that the through hole (4) of the piston (2) has a countersink, wherein a fastening bushing (7) an annular bottom portion (12) and an adjacent hollow-cylindrical wall portion (13) is provided, which projects into the countersink of the through hole (4) for receiving the head of the fastening screw (5), and via a the wall portion (13) of the fastening bushing ( 7) adjoining and radially outwardly extending edge portion (14) on the adjacent piston surface (9) comes to rest.
2. Kolben-Zylinder- Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass die die Befestigungsbuchse (7) aufnehmende Senkung im Kolben (2) in der Tiefe größer ausgeführt ist als die axiale Länge der Befestigungsbuchse (7), so dass durch Anziehen der Befestigungsschraube (5) ein axialer Toleranzausgleich erfolgt.2. piston-cylinder arrangement according to claim 1, characterized in that the fastening bushing (7) receiving reduction in the piston (2) is made larger in the depth than the axial length of the fastening bushing (7), so that by tightening the fastening screw (5) an axial tolerance compensation takes place.
3. Kolben-Zylinder- Anordnung nach Anspruch 1 , dadurch gekennzeichnet, dass die Befestigungsbuchse (7) daneben auch zur Klemmbefestigung mindestens einer Sauglamelle (8) am Kolben (2) durch Einspannen zwischen der Kolbenfläche (9) und dem Randabschnitt (14) dient.3. piston-cylinder arrangement according to claim 1, characterized in that the fastening bushing (7) also serves for clamping attachment at least one suction blade (8) on the piston (2) by clamping between the piston surface (9) and the edge portion (14) ,
4. Kolben-Zylinder-Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der sich nach Radialaußen hin erstreckende Randabschnitt (14) unten einem Winkel von kleiner als 90° zu dem hohlzylindrischen Wandabschnitt (13) angeordnet ist, so dass der Toleranzausgleich über den axial federnden Randabschnitt (14) erfolgt. 4. piston-cylinder assembly according to claim 1 or 2, characterized in that the radially outwardly extending edge portion (14) is arranged below an angle of less than 90 ° to the hollow cylindrical wall portion (13), so that the tolerance compensation on the axially resilient edge portion (14).
5. Kolben-Zylinder- Anordnung nach Anspruch 3, dadurch gekennzeichnet, dass der Randabschnitt (14) der Befestigungsbuchse (7) in eine Verjüngung (15) ausläuft, um einen Öffhungswinkel (17) zur Bewegungsbegrenzung der hier eingespannten Sauglamelle (8) zu schaffen.5. piston-cylinder arrangement according to claim 3, characterized in that the edge portion (14) of the fastening bushing (7) in a taper (15) runs out to create a Öffhungswinkel (17) for limiting the movement of the here clamped suction plate (8) ,
6. Kolben-Zylinder- Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass der Randabschnitt (14) eine außenradiale, abgerundete Abrollkante (16) zur Vermeidung von Brüchen der hier eingespannten mindestens einen Sauglamelle (8) aufweist.6. piston-cylinder arrangement according to claim 1, characterized in that the edge portion (14) has an outside radial, rounded rolling edge (16) to prevent fractures of the here clamped at least one suction plate (8).
7. Kolben-Zylinder- Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Befestigungsbuchse (7) aus einem Stahlblech besteht und durch die Fertigungsmaßnahmen Tiefziehen, Prägen und Stanzen hergestellt ist.7. piston-cylinder arrangement according to claim 1, characterized in that the fastening bushing (7) consists of a steel sheet and is made by the manufacturing measures deep drawing, stamping and punching.
8. Taumelscheibenverdichter mit mindestens einer Kolben-Zylinder-Einheit nach einem der vorstehenden Ansprüche. 8. swash plate compressor with at least one piston-cylinder unit according to one of the preceding claims.
EP05818221A 2004-12-20 2005-12-16 Piston-cylinder arrangement for a reciprocating compressor Not-in-force EP1831562B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004061236A DE102004061236B3 (en) 2004-12-20 2004-12-20 Piston-cylinder arrangement for a reciprocating compressor
PCT/EP2005/013602 WO2006066828A1 (en) 2004-12-20 2005-12-16 Piston-cylinder arrangement for a reciprocating compressor

Publications (2)

Publication Number Publication Date
EP1831562A1 true EP1831562A1 (en) 2007-09-12
EP1831562B1 EP1831562B1 (en) 2008-06-18

Family

ID=35825981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05818221A Not-in-force EP1831562B1 (en) 2004-12-20 2005-12-16 Piston-cylinder arrangement for a reciprocating compressor

Country Status (4)

Country Link
EP (1) EP1831562B1 (en)
AT (1) ATE398731T1 (en)
DE (2) DE102004061236B3 (en)
WO (1) WO2006066828A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3036873A (en) * 1961-09-13 1962-05-29 Kimwood Machine Co Piston and piston rod connection
US3961868A (en) * 1974-02-21 1976-06-08 Thomas Industries, Inc. Air compressor
US5644969A (en) * 1996-06-28 1997-07-08 Thomas Industries Inc. Wobble piston and cylinder arrangement
DE19706066A1 (en) * 1997-02-17 1997-11-20 Hans Dipl Ing Unger Compressor providing compressed air in vehicle
ITTO980311A1 (en) * 1998-04-10 1999-10-10 Abac Aria Compressa COMPRESSOR.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006066828A1 *

Also Published As

Publication number Publication date
ATE398731T1 (en) 2008-07-15
WO2006066828A1 (en) 2006-06-29
EP1831562B1 (en) 2008-06-18
DE502005004481D1 (en) 2008-07-31
DE102004061236B3 (en) 2006-08-31

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