EP2174041A1 - Pneumatic component - Google Patents

Pneumatic component

Info

Publication number
EP2174041A1
EP2174041A1 EP08773693A EP08773693A EP2174041A1 EP 2174041 A1 EP2174041 A1 EP 2174041A1 EP 08773693 A EP08773693 A EP 08773693A EP 08773693 A EP08773693 A EP 08773693A EP 2174041 A1 EP2174041 A1 EP 2174041A1
Authority
EP
European Patent Office
Prior art keywords
piston
pneumatic component
component according
ring
pneumatic
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
EP08773693A
Other languages
German (de)
French (fr)
Other versions
EP2174041B1 (en
Inventor
Jens-Thorsten Gronau
Mike Heurich
Tino Wiggers
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.)
ZF CV Systems Hannover GmbH
Original Assignee
Wabco 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 Wabco GmbH filed Critical Wabco GmbH
Publication of EP2174041A1 publication Critical patent/EP2174041A1/en
Application granted granted Critical
Publication of EP2174041B1 publication Critical patent/EP2174041B1/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
    • 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
    • F04B53/143—Sealing provided on the piston
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49265—Ring groove forming or finishing

Definitions

  • the invention relates to a pneumatic component having a cylinder, a piston running in the cylinder and a grooved ring which seals the piston against the cylinder and has a static side and a dynamic side.
  • Such pneumatic components are used, for example, in the form of compressors, in particular as piston air compressors, in trucks or passenger cars.
  • the pistons of the compressor have a circumferential groove, in which engages a grooved ring.
  • the grooved ring seals the piston against the cylinder.
  • the pistons for such compressors are partly produced by injection molding. This leaves a running in the longitudinal direction of the piston
  • This molding ridge must be removed by a cutting process in order to be able to raise separately produced rubber rings made of rubber on the piston can. Without removal of the molding ridge the U-ring is not seated sufficiently tight on the piston.
  • a disadvantage of such pneumatic components is therefore their complex production.
  • the rubber ring is first vulcanized sitting on the piston in an alternative manufacturing process.
  • a disadvantage of this is that this method for piston diameters of more than 70 mm such a small pro- Zessburn possesses that it can not be used in mass production.
  • the invention has for its object to overcome disadvantages in the prior art.
  • the invention solves the problem by a generic pneumatic component in which the U-ring on the static side has at least two concentric micro-lips.
  • the piston can be injection-molded, for example, from plastic, without the Formannonsgrat must be removed.
  • the micro-ribs ensure despite a burr for an airtight connection between the piston and the U-ring.
  • the U-rings can be made separately even with a diameter of more than 70 mm and subsequently connected to an injection-molded piston.
  • the dynamic side is understood to mean that side of the groove that rubs against another component during operation of the pneumatic component.
  • the static side is the side that rests upon operation of the pneumatic component relative to the component to which the U-ring is attached.
  • the U-ring is fixed to the piston so that its static side faces the piston.
  • the U-ring is attached to the piston so that the shaping ridge cuts the micro-ribs. If, for example, the shaping ridge runs in the longitudinal direction of the piston, then it is advantageous if the micro-ribs intersect the shaping ridge substantially perpendicularly.
  • micro-ribs protrude by less than 0.5 mm over a base.
  • the piston has a diameter of more than 70 mm.
  • the pneumatic component can be built with a particularly large cubic capacity without having to remove the burr. With such diameters, vulcanization of the groove is no longer possible.
  • U-ring is made of rubber, since such U-rings have a particularly long service life.
  • a particularly high sealing effect is achieved if the grooved ring has a multiplicity of concentric micro-lips, for example 3, 4, 5 or more micro-ribs.
  • a pneumatic component according to the invention is used particularly advantageously as an air compressor, in particular for a commercial vehicle pneumatic system.
  • a pneumatic component according to the invention can also be used as a pneumatic actuator, in particular as a pneumatic gearbox.
  • Figure 1 shows a schematic cross section through a pneumatic component according to the invention.
  • Figure 2 shows a detail of a Nutrings a inventive
  • FIG. 3 shows a three-dimensional view of a groove for a pneumatic component according to the invention.
  • FIG. 1 shows a pneumatic component in the form of a compressor 10 which comprises a cylinder 12, a piston 14 running in the cylinder 12 and a grooved ring 16.
  • the grooved ring 16 is fixedly secured in a circumferential groove 18 around the piston 14.
  • the piston 14 is reciprocable at a connecting rod 19.
  • the grooved ring 16 seals a gap 20 between the cylinder 12 and the piston 14, so that air 22, which is located in the cylinder 12, is compressed to an air pressure p.
  • the compressed air is discharged through a non-illustrated check valve from the cylinder and when moving the piston 14 out of the cylinder 12, air can past the grooved ring 16 by flow the gap 20 to be compressed at a subsequent stroke.
  • the piston 14 is made of plastic in an injection molding process, which has led to a Entformungsgrat 24, which is shown schematically by dashed lines and extending along a longitudinal axis of the piston 14 and extends through the groove 18.
  • a Entformungsgrat 24 which is shown schematically by dashed lines and extending along a longitudinal axis of the piston 14 and extends through the groove 18.
  • the groove ring 16 rests flush against the piston 14 in the area of the molding pitch 24.
  • it has on its static side S stat micro lips, as shown in detail in FIG.
  • S d y n micro-ribs may be provided, but it is not in the present case.
  • Figure 2 shows the grooved ring 16 in a detailed view.
  • the grooved ring 16 has a radially outer sealing lip 30 of substantially constant thickness, which has a rounding at its radially outermost edge 32.
  • the grooved ring 16 which is essentially V-shaped, merges into a cylinder jacket-shaped abutment section 34, with which it bears against the piston 14 in the groove 18.
  • the abutment portion 34 has an axial extent, which corresponds to substantially half an axial extent of the Nutrings 16.
  • the inner diameter of the Nutrings 16 is selected in the contact portion 34 so that it rests without play and with little force on the piston.
  • Adjoining the contact section 34 is a transition section 35, which projects radially inwards and merges into an engagement section 36.
  • the transition section 35 has, in the transition into the engagement section 36, a diameter which is selected such that it has a sufficiently large diameter Pressure on the piston 12 (see Figure 1) is applied to seal the pressure chamber 26 at the air pressure p against the suction chamber 28, if the demolding burr 24 is removed.
  • the diameter is 100 microns to 1 mm smaller than the inner diameter of the abutment portion 34th
  • micro-lips 38a, 38b, 38c, 38d are formed in the engagement portion 36, which are separated from each other by respective lip bases 40a, 40b, 40c.
  • the micro-ribs 38 protrude by 0.1 mm to 0.7 mm over a cylinder jacket-shaped base 42 which extends through the lips 40a, 40b, 40c.
  • the micro-ribs 38 all have substantially the same cross-sectional contour and are arranged concentrically with one another.
  • the micro-ribs have a micro-lip width b which is smaller than one-tenth of the width B of the nut-ring 16.
  • the micro-rib width b is less than 1 mm and in particular more than 0.1 mm.
  • the micro-rib width is also desirably chosen to be smaller than one quarter of a width N of the engagement portion 36 (see Fig. 1).
  • FIG. 3 shows the grooved ring 16 in a three-dimensional view.
  • the pistons 14 are injection-molded and a cylinder housing 44 is produced, which is shown schematically in FIG. 1 and formed in the cylinder 12. It is also the U-ring 16 made of rubber and in particular vulcanized. Subsequently, the grooved ring 16 is pulled over the non-machined after injection molding piston 14 and placed in the groove 18. Subsequently, the said components are installed with other components, such as a pulley for driving the connecting rod 19 to a compressor.
  • the pneumatic component may alternatively also be a pneumatic cylinder. In this case, the connecting rod 19 acts as a push rod. By pressurizing the pneumatic cylinder with compressed air, the push rod is pushed out of the cylinder housing 44 and actuates a component to be switched or moved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Compressor (AREA)
  • Actuator (AREA)

Abstract

The invention relates to a pneumatic component with a cylinder (12), a piston (14) running in the cylinder and a grooved ring (16), which seals the piston (14) from the cylinder (12) and has a static side (Sstat) and a dynamic side (Sdyn). According to the invention, the grooved ring (16) has at least two concentric microlips (38) on the static side (Sstat).

Description

Pneumatikkomponente pneumatic components
Die Erfindung betrifft eine Pneumatikkomponente mit einem Zylinder, einem in dem Zylinder laufenden Kolben und einem Nutring, der den Kolben gegen den Zylinder abdichtet und eine statische Seite und eine dynamische Seite besitzt.The invention relates to a pneumatic component having a cylinder, a piston running in the cylinder and a grooved ring which seals the piston against the cylinder and has a static side and a dynamic side.
Derartige Pneumatikkomponenten werden beispielsweise in Form von Kom- pressoren, insbesondere als Kolbenluftverdichter, in Lastkraftwagen oder Personenkraftwagen eingesetzt. Die Kolben des Kompressors besitzen eine umlaufende Nut, in die ein Nutring eingreift. Der Nutring dichtet den Kolben gegen den Zylinder ab. Um den Fertigungsaufwand zu verringern, werden die Kolben für derartige Kompressoren teilweise im Spritzgussverfahren her- gestellt. Dabei verbleibt ein in Längsrichtung des Kolbens verlaufenderSuch pneumatic components are used, for example, in the form of compressors, in particular as piston air compressors, in trucks or passenger cars. The pistons of the compressor have a circumferential groove, in which engages a grooved ring. The grooved ring seals the piston against the cylinder. In order to reduce the production costs, the pistons for such compressors are partly produced by injection molding. This leaves a running in the longitudinal direction of the piston
Formteilungsgrat. Dieser Formteilungsgrat muss mit einem spanenden Verfahren entfernt werden, um gesondert hergestellte Nutringe aus Gummi auf den Kolben aufziehen zu können. Ohne Entfernen des Formteilungsgrats sitzt der Nutring nicht hinreichend dicht auf dem Kolben.Mold parting. This molding ridge must be removed by a cutting process in order to be able to raise separately produced rubber rings made of rubber on the piston can. Without removal of the molding ridge the U-ring is not seated sufficiently tight on the piston.
Nachteilig an derartigen Pneumatikkomponenten ist daher deren aufwändige Herstellung. Um das Entfernen des Formteilungsgrats entbehrlich zu machen, wird der Gummiring in einem alternativen Herstellungsverfahren erst auf dem Kolben sitzend vulkanisiert. Nachteilig hieran ist, dass dieses Ver- fahren für Kolbendurchmesser von mehr als 70 mm eine so geringe Pro- zesssicherheit besitzt, dass es im Rahmen einer Massenfertigung nicht verwendbar ist.A disadvantage of such pneumatic components is therefore their complex production. In order to make it unnecessary to remove the molding burr, the rubber ring is first vulcanized sitting on the piston in an alternative manufacturing process. A disadvantage of this is that this method for piston diameters of more than 70 mm such a small pro- Zesssicherheit possesses that it can not be used in mass production.
Der Erfindung liegt die Aufgabe zugrunde, Nachteile im Stand der Technik zu überwinden.The invention has for its object to overcome disadvantages in the prior art.
Die Erfindung löst das Problem durch eine gattungsgemäße Pneumatikkomponente, bei der der Nutring auf der statischen Seite mindestens zwei konzentrische Mikrolippen aufweist.The invention solves the problem by a generic pneumatic component in which the U-ring on the static side has at least two concentric micro-lips.
Vorteilhaft daran ist, dass der Kolben beispielsweise aus Kunststoff spritzgegossen werden kann, ohne dass der Formteilungsgrat entfernt werden muss. Die Mikrolippen sorgen nämlich trotz Formteilungsgrat für eine luftdichte Verbindung zwischen dem Kolben und dem Nutring. Vorteilhafterweise kön- nen die Nutringe auch bei einem Durchmesser von mehr als 70 mm gesondert hergestellt und nachträglich mit einem spritzgegossenen Kolben verbunden werden.The advantage of this is that the piston can be injection-molded, for example, from plastic, without the Formteilungsgrat must be removed. The micro-ribs ensure despite a burr for an airtight connection between the piston and the U-ring. Advantageously, the U-rings can be made separately even with a diameter of more than 70 mm and subsequently connected to an injection-molded piston.
Vorteilhaft ist zudem, dass eine hohe Dichtigkeit trotz eines vorhandenen Formteilungsgrats erreichbar ist, so dass auf Dichtfett weitgehend verzichtet werden kann.It is also advantageous that a high density can be achieved despite an existing Formteilungsgrats, so that can be largely dispensed with sealing grease.
Im Rahmen der vorliegenden Beschreibung wird unter der dynamischen Seite diejenige Seite des Nutrings verstanden, die beim Betrieb der Pneumatik- komponente an einer anderen Komponente reibt. Die statische Seite hingegen ist diejenige Seite, die bei Betrieb der Pneumatikkomponente relativ zu der Komponente ruht, an der der Nutring angebracht ist. In einer bevorzugten Ausführungsform ist der Nutring so am Kolben befestigt, dass seine statische Seite dem Kolben zugewandt ist. Vorteilhaft hieran ist, dass der Kolben in einem Spritzgussverfahren aus Kunststoff gefertigt werden kann, ohne dass der dabei unvermeidlich entstehende Formtei- lungsgrat aufwändig entfernt werden müsste. Eine Fertigung des Kolbens aus Kunststoff führt zu einem besonders leicht und einfach zu fertigenden Kolben.In the context of the present description, the dynamic side is understood to mean that side of the groove that rubs against another component during operation of the pneumatic component. The static side, on the other hand, is the side that rests upon operation of the pneumatic component relative to the component to which the U-ring is attached. In a preferred embodiment, the U-ring is fixed to the piston so that its static side faces the piston. An advantage of this is that the piston can be made in an injection molding of plastic, without the inevitable resulting mold deflection would be laboriously removed. A production of the piston made of plastic leads to a particularly easy and easy to manufacture piston.
Besonders bevorzugt ist der Nutring so am Kolben befestigt, dass der Form- teilungsgrat die Mikrolippen schneidet. Verläuft der Formteilungsgrat beispielsweise in Längsrichtung des Kolbens, so ist es vorteilhaft, wenn die Mikrolippen den Formteilungsgrat im Wesentlichen senkrecht schneiden.Particularly preferably, the U-ring is attached to the piston so that the shaping ridge cuts the micro-ribs. If, for example, the shaping ridge runs in the longitudinal direction of the piston, then it is advantageous if the micro-ribs intersect the shaping ridge substantially perpendicularly.
Für eine gute Dichtwirkung bei gleichzeitig sicherem Halt des Nutrings auf dem Kolben hat es sich als vorteilhaft herausgestellt, wenn die Mikrolippen um weniger als 0,5 mm über eine Grundfläche abstehen.For a good sealing effect with a secure hold of the Nutrings on the piston, it has been found to be advantageous if the micro-ribs protrude by less than 0.5 mm over a base.
Besonders vorteilhaft ist, wenn der Kolben einen Durchmesser von mehr als 70 mm hat. In diesem Fall kann die Pneumatikkomponente mit einem be- sonders großen Hubraum gebaut werden, ohne dass der Formteilungsgrat entfernt werden müsste. Bei derartigen Durchmessern ist ein Aufvulkanisieren des Nutrings nicht mehr möglich.It is particularly advantageous if the piston has a diameter of more than 70 mm. In this case, the pneumatic component can be built with a particularly large cubic capacity without having to remove the burr. With such diameters, vulcanization of the groove is no longer possible.
Günstig ist es, wenn der Nutring aus Gummi besteht, da derartige Nutringe eine besonders hohe Lebensdauer besitzen.It is advantageous if the U-ring is made of rubber, since such U-rings have a particularly long service life.
Eine besonders hohe Dichtungswirkung wird erreicht, wenn der Nutring eine Vielzahl konzentrischer Mirkolippen aufweist, beispielsweise 3, 4, 5 oder mehr Mikrolippen. Eine erfindungsgemäße Pneumatikkomponente wird besonders vorteilhaft als Luftkompressor, insbesondere für ein Nutzfahrzeug-Pneumatiksystem, eingesetzt. Alternativ ist eine erfindungsgemäße Pneumatikkomponente auch als pneumatischer Aktuoator, insbesondere als pneumatische Getrie- beschaltung verwendbar.A particularly high sealing effect is achieved if the grooved ring has a multiplicity of concentric micro-lips, for example 3, 4, 5 or more micro-ribs. A pneumatic component according to the invention is used particularly advantageously as an air compressor, in particular for a commercial vehicle pneumatic system. Alternatively, a pneumatic component according to the invention can also be used as a pneumatic actuator, in particular as a pneumatic gearbox.
Im Folgenden wird eine Ausführungsform der vorliegenden Erfindung anhand der beigefügten Zeichnungen näher erläutert. Dabei zeigtIn the following, an embodiment of the present invention is explained in more detail with reference to the accompanying drawings. It shows
Figur 1 einen schematischen Querschnitt durch eine erfindungsgemäße Pneumatikkomponente.Figure 1 shows a schematic cross section through a pneumatic component according to the invention.
Figur 2 zeigt ein Detail eines Nutrings einer erfindungsgemäßenFigure 2 shows a detail of a Nutrings a inventive
Pneumatikkomponente undPneumatic component and
Figur 3 zeigt eine dreidimensionale Ansicht eines Nutrings für eine erfindungsgemäße Pneumatikkomponente.FIG. 3 shows a three-dimensional view of a groove for a pneumatic component according to the invention.
Figur 1 zeigt eine Pneumatikkomponente in Form eines Kompressors 10, der einen Zylinder 12, einen in dem Zylinder 12 laufenden Kolben 14 und einen Nutring 16 umfasst. Der Nutring 16 ist in einer um den Kolben 14 umlaufenden Nut 18 fest befestigt. Der Kolben 14 ist an einem Pleuel 19 hin und her bewegbar. Wird der Kolben 14 in den Zylinder 12 eingeschoben, dichtet der Nutring 16 einen Spalt 20 zwischen dem Zylinder 12 und dem Kolben 14 ab, so dass Luft 22, die sich im Zylinder 12 befindet, auf einen Luftdruck p komprimiert wird. Die komprimierte Luft wird durch ein nicht eingezeichnete Rückschlagventil aus dem Zylinder abgelassen und beim Bewegen des Kolbens 14 aus dem Zylinder 12 heraus kann Luft am Nutring 16 vorbei durch den Spalt 20 strömen, um bei einem nachfolgenden Hub komprimiert zu werden.FIG. 1 shows a pneumatic component in the form of a compressor 10 which comprises a cylinder 12, a piston 14 running in the cylinder 12 and a grooved ring 16. The grooved ring 16 is fixedly secured in a circumferential groove 18 around the piston 14. The piston 14 is reciprocable at a connecting rod 19. When the piston 14 is inserted into the cylinder 12, the grooved ring 16 seals a gap 20 between the cylinder 12 and the piston 14, so that air 22, which is located in the cylinder 12, is compressed to an air pressure p. The compressed air is discharged through a non-illustrated check valve from the cylinder and when moving the piston 14 out of the cylinder 12, air can past the grooved ring 16 by flow the gap 20 to be compressed at a subsequent stroke.
Der Kolben 14 ist aus Kunststoff in einem Spritzgussverfahren hergestellt, was zu einem Entformungsgrat 24 geführt hat, der schematisch gestrichelt eingezeichnet ist und sich entlang einer Längsachse des Kolbens 14 erstreckt und auch durch die Nut 18 verläuft. Um einen Druckraum 26 von einem Saugraum 28 des Zylinders 12 luftdicht zu trennen, muss sichergestellt sein, dass der Nutring 16 auch im Bereich des Formteilungsgrats 24 bündig am Kolben 14 anliegt. Dazu besitzt er an seiner statischen Seite Sstat Mikro- lippen, wie sie in Figur 2 genau gezeigt sind. Auch auf seiner dynamischen Seite Sdyn können Mikrolippen vorgesehen sein, sind es aber im vorliegenden Fall nicht.The piston 14 is made of plastic in an injection molding process, which has led to a Entformungsgrat 24, which is shown schematically by dashed lines and extending along a longitudinal axis of the piston 14 and extends through the groove 18. In order to airtightly separate a pressure space 26 from a suction space 28 of the cylinder 12, it must be ensured that the groove ring 16 rests flush against the piston 14 in the area of the molding pitch 24. For this purpose it has on its static side S stat micro lips, as shown in detail in FIG. Also on its dynamic side S d y n micro-ribs may be provided, but it is not in the present case.
Figur 2 zeigt den Nutring 16 in einer Detailansicht. Der Nutring 16 besitzt eine radial außen liegende Dichtlippe 30 von im Wesentlichen konstanter Dicke, die an ihrer radial äußersten Kante 32 eine Abrundung besitzt. An seinem der Kante 32 abgewandten Ende geht der Nutring 16, der im Wesentlichen V-förmig ausgebildet ist, in einen zylindermantelförmigen Anlageab- schnitt 34 über, mit dem er in der Nut 18 am Kolben 14 anliegt. Der Anlageabschnitt 34 besitzt eine axiale Ausdehnung, die im Wesentlichen einer halben axialen Ausdehnung des Nutrings 16 entspricht. Der Innendurchmesser des Nutrings 16 ist im Anlageabschnitt 34 so gewählt, dass er ohne Spiel und mit geringer Kraft am Kolben anliegt.Figure 2 shows the grooved ring 16 in a detailed view. The grooved ring 16 has a radially outer sealing lip 30 of substantially constant thickness, which has a rounding at its radially outermost edge 32. At its end remote from the edge 32, the grooved ring 16, which is essentially V-shaped, merges into a cylinder jacket-shaped abutment section 34, with which it bears against the piston 14 in the groove 18. The abutment portion 34 has an axial extent, which corresponds to substantially half an axial extent of the Nutrings 16. The inner diameter of the Nutrings 16 is selected in the contact portion 34 so that it rests without play and with little force on the piston.
An den Anlageabschnitt 34 schließt sich ein Übergangsabschnitt 35 an, der radial nach innen vorspringt und in einen Eingriffsabschnitt 36 übergeht.. Der Übergangsabschnitt 35 besitzt im Übergang in den Eingriffsabschnitt 36 einen Durchmesser, der so gewählt ist, dass er mit einem hinreichend großen Druck an dem Kolben 12 (vgl. Figur 1) anliegt, um den Druckraum 26 beim Luftdruck p gegen den Saugraum 28 abzudichten, sofern der Entformungs- grat 24 entfernt ist. Beispielsweise ist der Durchmesser 100 μm bis 1 mm kleiner als der Innendurchmesser des Anlageabschnitts 34.Adjoining the contact section 34 is a transition section 35, which projects radially inwards and merges into an engagement section 36. The transition section 35 has, in the transition into the engagement section 36, a diameter which is selected such that it has a sufficiently large diameter Pressure on the piston 12 (see Figure 1) is applied to seal the pressure chamber 26 at the air pressure p against the suction chamber 28, if the demolding burr 24 is removed. For example, the diameter is 100 microns to 1 mm smaller than the inner diameter of the abutment portion 34th
Um die dichtigkeitsvermindernde Wirkung des Entformungsgrat 24 zu beheben, sind im Eingriffsabschnitt 36 radial nach innen weisende Mikrolippen 38a, 38b, 38c, 38d ausgebildet, die durch jeweilige Lippengründe 40a, 40b, 40c voneinander getrennt sind. Die Mikrolippen 38 stehen um 0,1 mm bis 0,7 mm über eine zylindermantelförmige Grundfläche 42 ab, die durch die Lippengründe 40a, 40b, 40c verläuft. Die Mikrolippen 38 weisen alle im Wesentlichen die gleiche Querschnittskontur auf und sind konzentrisch zueinander angeordnet. Die Mikrolippen besitzen eine Mikrolippenbreite b, die kleiner ist als ein Zehntel der Breite B des Nutrings 16. Beispielsweise liegt die Mikrolippenbreite b unter 1 mm und insbesondere über 0,1 mm. Die Mikrolippenbreite ist zudem günstigerweise so gewählt, dass sie kleiner ist als ein Viertel einer Breite N des Eingriffsabschnitts 36 (vgl. Figur 1).In order to eliminate the leak-reducing effect of the demolding ridge 24, radially inwardly directed micro-lips 38a, 38b, 38c, 38d are formed in the engagement portion 36, which are separated from each other by respective lip bases 40a, 40b, 40c. The micro-ribs 38 protrude by 0.1 mm to 0.7 mm over a cylinder jacket-shaped base 42 which extends through the lips 40a, 40b, 40c. The micro-ribs 38 all have substantially the same cross-sectional contour and are arranged concentrically with one another. The micro-ribs have a micro-lip width b which is smaller than one-tenth of the width B of the nut-ring 16. For example, the micro-rib width b is less than 1 mm and in particular more than 0.1 mm. The micro-rib width is also desirably chosen to be smaller than one quarter of a width N of the engagement portion 36 (see Fig. 1).
Figur 3 zeigt den Nutring 16 in einer dreidimensionalen Ansicht.FIG. 3 shows the grooved ring 16 in a three-dimensional view.
Zur Herstellung des Kompressors 10 werden die Kolben 14 spritzgegossen und ein Zylindergehäuse 44 gefertigt, dass in Figur 1 schematisch gezeigt und in dem Zylinder 12 ausgebildet ist. Es wird zudem der Nutring 16 aus Gummi hergestellt und dabei insbesondere vulkanisiert. Nachfolgend wird der Nutring 16 über den nach dem Spritzgießen nicht spanend nachbearbeiteten Kolben 14 gezogen und in der Nut 18 platziert. Anschließend werden die genannten Komponenten mit weiteren Bauelementen, wie beispielsweise einem Riemenrad zum Antrieb des Pleuels 19 zu einem Kompressor verbaut. Die Pneumatikkomponente kann alternativ auch ein Pneumatikzylinder sein. In diesem Fall fungiert das Pleuel 19 als Druckstange. Durch Beaufschlagen des Pneumatikzylinders mit Druckluft wird die Druckstange aus dem Zylindergehäuse 44 heraus gedrückt und betätigt eine zu schaltende oder zu bewegende Komponente. To produce the compressor 10, the pistons 14 are injection-molded and a cylinder housing 44 is produced, which is shown schematically in FIG. 1 and formed in the cylinder 12. It is also the U-ring 16 made of rubber and in particular vulcanized. Subsequently, the grooved ring 16 is pulled over the non-machined after injection molding piston 14 and placed in the groove 18. Subsequently, the said components are installed with other components, such as a pulley for driving the connecting rod 19 to a compressor. The pneumatic component may alternatively also be a pneumatic cylinder. In this case, the connecting rod 19 acts as a push rod. By pressurizing the pneumatic cylinder with compressed air, the push rod is pushed out of the cylinder housing 44 and actuates a component to be switched or moved.

Claims

Patentansprüche claims
1. Pneumatikkomponente mit (a) einem Zylinder (12), (b) einem in dem Zylinder (12) laufenden Kolben (14) und1. pneumatic component with (a) a cylinder (12), (b) in the cylinder (12) running piston (14) and
(c) einem Nutring (16), der(C) a grooved ring (16), the
(i) den Kolben (14) gegen den Zylinder (12) abdichtet und (ii) eine statisches Seite (Sstat) und (iii) eine dynamische Seite (Sdyn) besitzt, dadurch gekennzeichnet, dass der Nutring (16) auf der statischen Seite(i) the piston (14) against the cylinder (12) seals and (ii) a static side (S s tat) and (iii) a dynamic side (S dyn ) has, characterized in that the U-ring (16) the static side
(Sstat) mindestens zwei konzentrische Mikrolippen (38) aufweist.(S stat ) has at least two concentric micro-lips (38).
2. Pneumatikkomponente nach Anspruch 1 , dadurch gekennzeichnet, dass der Nutring (16) so am Kolben (14) befestigt ist, dass seine statische Seite (Sstat) dem Kolben (14) zugewandt ist.2. Pneumatic component according to claim 1, characterized in that the U-ring (16) is fixed to the piston (14) such that its static side (S stat ) faces the piston (14).
3. Pneumatikkomponente nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Kolben (14) aus Kunststoff gefertigt ist.3. Pneumatic component according to one of the preceding claims, characterized in that the piston (14) is made of plastic.
4. Pneumatikkomponente nach Anspruch 3, dadurch gekennzeichnet, dass der Kolben (14) ein Spritzgussteil ist.4. Pneumatic component according to claim 3, characterized in that the piston (14) is an injection molded part.
5. Pneumatikkomponente nach Anspruch 4, dadurch gekennzeichnet, dass der Kolben (14) einen Formteilungsgrat aufweist und der Nutring (16) so am Kolben (14) befestigt ist, dass der Formteilungsgrat (24) die Mikrolippen (38) schneidet.5. A pneumatic component according to claim 4, characterized in that the piston (14) has a Formteilungsgrat and the U-ring (16) is fixed to the piston (14), that the Formteilungsgrat (24) intersects the micro-ribs (38).
6. Pneumatikkomponente nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Mikrolippen (38) um weniger als 0,5 mm über ei- ne Grundfläche (42) abstehen.6. Pneumatic component according to one of the preceding claims, characterized in that the micro-ribs (38) are less than 0.5 mm above a ne footprint (42) protrude.
7. Pneumatikkomponente nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Kolben (14) einen Durchmesser von mehr als 70 mm hat.7. Pneumatic component according to one of the preceding claims, characterized in that the piston (14) has a diameter of more than 70 mm.
8. Pneumatikkomponente nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Nutring (16) aus Gummi besteht.8. Pneumatic component according to one of the preceding claims, characterized in that the groove ring (16) consists of rubber.
9. Pneumatikkomponente nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Nutring (16) eine Vielzahl konzentrischer Mikro- lippen (38) aufweist.9. Pneumatic component according to one of the preceding claims, characterized in that the groove ring (16) has a plurality of concentric micro lips (38).
10. Pneumatikkomponente nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass er ein Luftkompressor, insbesondere für ein Nutzfahrzeug-Pneumatiksystem, ist.10. Pneumatic component according to one of the preceding claims, characterized in that it is an air compressor, in particular for a commercial vehicle pneumatic system.
1 1. Pneumatikkomponente nach einem der Ansprüche 1 bis 10, dadurch ge- kennzeichnet, dass sie ein pneumatischer Aktuator, insbesondere für eine pneumatische Getriebeschaltung ist. 1 1. Pneumatic component according to one of claims 1 to 10, character- ized in that it is a pneumatic actuator, in particular for a pneumatic transmission circuit.
12. Verfahren zum Herstellen einer Pneumatikkomponente nach einem der vorstehenden Ansprüche, gekennzeichnet durch die Schritte:12. A method for producing a pneumatic component according to one of the preceding claims, characterized by the steps:
(a) Herstellen eines Zylindergehäuses, in dem ein Zylinder ausgebildet ist (b) Spritzgießen eines Kolbens mit einer radial umlaufenden Nut,(a) manufacturing a cylinder housing in which a cylinder is formed (b) injection molding a piston with a radially encircling groove,
(c) Herstellen eines Nutrings und(c) making a nourish and
(d) Einsetzen des Nutrings in die Nut, wobei der Nutring eine statische Seite und eine dynamische Seite hat, dadurch gekennzeichnet, dass der Nutring so hergestellt wird, dass er auf der statischen Seite mindestens zwei konzentrische Mikrolippen besitzt.(D) inserting the Nutrings in the groove, wherein the U-ring has a static side and a dynamic side, characterized in that the U-ring is made so that it has at least two concentric micro-ribs on the static side.
13. Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass der Kolben aus Kunststoff spritzgegossen wird. 13. The method according to claim 12, characterized in that the piston is injection molded from plastic.
EP08773693.0A 2007-07-26 2008-06-26 Pneumatic component Not-in-force EP2174041B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007034978A DE102007034978A1 (en) 2007-07-26 2007-07-26 pneumatic components
PCT/EP2008/005217 WO2009012862A1 (en) 2007-07-26 2008-06-26 Pneumatic component

Publications (2)

Publication Number Publication Date
EP2174041A1 true EP2174041A1 (en) 2010-04-14
EP2174041B1 EP2174041B1 (en) 2017-01-18

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ID=39768489

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Application Number Title Priority Date Filing Date
EP08773693.0A Not-in-force EP2174041B1 (en) 2007-07-26 2008-06-26 Pneumatic component

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US (1) US8505439B2 (en)
EP (1) EP2174041B1 (en)
CN (1) CN101680546B (en)
DE (1) DE102007034978A1 (en)
WO (1) WO2009012862A1 (en)

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Also Published As

Publication number Publication date
CN101680546A (en) 2010-03-24
EP2174041B1 (en) 2017-01-18
CN101680546B (en) 2012-10-10
US8505439B2 (en) 2013-08-13
WO2009012862A1 (en) 2009-01-29
DE102007034978A1 (en) 2009-01-29
US20100189579A1 (en) 2010-07-29

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