EP0656462B1 - Sealing device - Google Patents
Sealing device Download PDFInfo
- Publication number
- EP0656462B1 EP0656462B1 EP94108017A EP94108017A EP0656462B1 EP 0656462 B1 EP0656462 B1 EP 0656462B1 EP 94108017 A EP94108017 A EP 94108017A EP 94108017 A EP94108017 A EP 94108017A EP 0656462 B1 EP0656462 B1 EP 0656462B1
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- EP
- European Patent Office
- Prior art keywords
- sealing
- sealing strip
- groove
- arrangement according
- recesses
- 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.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C19/00—Sealing arrangements in rotary-piston machines or engines
- F01C19/02—Radially-movable sealings for working fluids
- F01C19/06—Radially-movable sealings for working fluids of resilient material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0007—Radial sealings for working fluid
Definitions
- the invention relates to a sealing arrangement for sealing two machine parts which are arranged so as to be pivotable relative to one another and which are formed by a shaft and a housing enclosing the shaft at a radial distance, the annular space formed by the distance being separated from one another by at least two vanes in at least two circumferential directions sealed chambers which can be pressurized to initiate the pivoting movement, the surface being relatively rigidly connected to the shaft and / or the housing, extending essentially along the entire axial extent of the chambers and approximating the relatively movable machine part except for a sealing gap are, each comprising a sealing strip made of elastomeric material, which is arranged in an opening in the direction of the sealing gap, substantially U-shaped groove of the wing, enclosing the wing circumferentially and the relatively pivotable Mas chin part touched with elastic sealing with a sealing surface.
- Such a sealing arrangement is known from DE-OS 14 50 302.
- the sealing arrangement comprises a pressure-dependent seal of a shaft which is unequally pressurized on the circumference, the wing being provided with a seal which grinds on the cylindrical surface of the shaft to be sealed. It should be noted, however, that the seal, particularly for sealing higher pressures in the range of 350 bar and alternating pressurization on both sides, has unsatisfactory performance properties.
- the shaft passage through the housing is sealed separately, whereby a sealing ring is used for sealing, which consists of a compliant, slightly flexible, yet strong and wear-resistant material, such as PTFE.
- the invention has for its object to further develop a sealing arrangement of the known type such that a secure sealing of the wing against the relatively movable machine part is achieved during a long period of use and that the sealing strip in the radial direction of the shaft and housing has a compliance that is sufficient, to compensate for manufacturing tolerances of the machine parts and to ensure a consistently good seal over a long period of use.
- the contact pressure of the sealing strip on the corresponding sealing surfaces should be proportionally and automatically adapted to pressure changes in the adjacent chambers.
- the sealing strip has an essentially S-shaped cross section and the lateral boundary surfaces of the groove with integrally formed spacers are in contact with elastic prestressing and touches the groove base and that the spacers are designed and arranged such that essentially the entire area of the respective flanks of the sealing strip and the respectively adjacent chamber can be pressurized together.
- the S-shaped cross section of the sealing strip on the one hand provides good flexibility to compensate for manufacturing-related tolerances in the direction of the contact pressure between the groove base and the surface to be sealed.
- the sealing strip has a matching cross section along its entire extent.
- a uniformly good sealing of the sealing gap running around the circumference of each wing such a shape is of particular advantage.
- such a configuration avoids relaxation phenomena of different strengths in individual partial areas of the sealing strip, so that the sealing strip is pressed along its entire length with a corresponding contact pressure against the surface of the relatively movable machine part to be sealed during its entire service life.
- the two flanks of the sealing strip can be provided with correspondingly designed recesses to form the S-shaped profile. Since the two flanks thereby have a substantially corresponding hydraulically effective surface, the pressure force on the surface to be sealed and the static sealing surfaces within the groove are of equal magnitude when the adjacent chambers are alternately pressurized.
- the recesses can have an essentially U-shaped profile open in the direction of the lateral boundary surfaces of the groove.
- care must be taken that the recesses are produced while avoiding abrupt changes in direction.
- the groove base of the recesses should be arched, for example semicircular, in order to effectively reduce notch effects in the region of the lateral flanks of the groove when the recesses are pressurized and widened. The risk of damage to the groove base of the recesses is therefore negligible during the entire service life of the sealing arrangement.
- the recesses can each be 0.3 to 0.6 times as wide as the width of the sealing strip, the recesses preferably being 0.1 to 0.4 times as high as the height of the sealing strip. Further improved performance properties are achieved if the recesses have a width that is 0.5 times as wide as the width of the sealing strip, the recesses each extending to the middle of the width of the sealing strip.
- the compromise of sufficient flexibility of the sealing strip in the direction of the contact pressure on the surface to be sealed of the relatively movable machine part and the widening of the flank when pressure is applied in the same direction is particularly advantageous in such a configuration.
- the ratio of the maximum width and maximum height of the recesses can advantageously be 0.8 to 1.2. Due to the almost square ratio of the width and height of the recesses, a sufficiently large hydraulically effective area is provided when the recesses are pressurized, the deformation-related mechanical loads in this area of the sealing strip being extraordinarily low due to such a shape.
- the sealing strip can sealingly touch the groove base of the groove with at least two statically stressed sealing surfaces under elastic prestress, the statically loaded sealing surfaces being spaced apart from one another in the direction of the width of the sealing strip.
- the statically stressed sealing surfaces are dimensioned and designed in such a way that when the individual flanks of the sealing strip are subjected to overpressure, a sufficiently high contact pressure results in the groove base to achieve the pivoting movement of the shaft and / or the housing.
- the security against liquid penetration in the area of the static sealing surface of the groove base from the chamber of relatively higher pressure into the chamber of relatively lower pressure can be further increased if the distance between the two statically loaded sealing surfaces is provided with a grease filling and an additional liquid barrier is thereby required .
- the advantages described above have a particularly favorable effect on the usage properties of the entire component.
- Such a sealing arrangement can be used to seal maximum pressures in the range of 350 bar. Depending on the design of the swivel motor, high torques can thus be applied.
- the sealing arrangement according to the invention is therefore well suited for most applications.
- the dynamic sealing surface of the sealing strip which is supported on the surface of the relatively movable machine part, can be limited by two intersecting conical surfaces, each of which encloses a corresponding angle with the surface of the machine part to be sealed, which is preferably 120 ° to 140 °. Due to the matching angle of the two conical surfaces relative to the machine part to be sealed, the sealing effect of the sealing arrangement is of a consistently high quality, regardless of the pivoting direction.
- a swivel motor comprising a housing 2, which is designed as a stator, and a shaft 1, which forms the rotor.
- the shaft 2 is stepped and is sealed in the area of its shoulder by a rotary pressure seal 25.
- Fig. 2 it can be seen that in the annular space 3, which is delimited by the shaft 1 and the housing 2, four wings 4, 5, 26, 27 are arranged in this embodiment, the two wings 5, 27 rotatably with the shaft 1 are connected and the wings 4, 26 form integral parts of the housing 2 and touch the surface of the adjacent machine part sealingly.
- the wings 4, 5, 26, 27 form chambers 6, 7, 28, 29, the chamber pairs 6 and 28 and 7 and 29 being able to be pressurized in pairs in order to pivot the shaft 1 and the housing 2 of the swivel motor relative to one another.
- FIG. 3 shows an enlarged section X from FIG. 2, wherein it can be seen that the sealing strip 9 has an essentially S-shaped profile within the groove 10 and the lateral boundary surfaces 12, 13 of the groove 10 with spacers 14, 15 touched under tension.
- the spacers 14, 15 are interrupted at least once in the longitudinal direction of the sealing strip, so that the recesses 19, 20, if necessary, with the pressure from the each adjacent chambers 6, 7 can be acted upon.
- the sealing strip 9 is supported with two statically stressed sealing surfaces 23, 24, which are associated with one another at a distance from one another.
- the pressurization of the recesses 19, 20 results in their widening, which leads to an additional contact pressure of the sealing strip 9 within the groove 10, consisting of the groove base 16 and the two lateral boundary surfaces 12 , 13 leads. Because the sealing strip, which is made entirely of elastomeric material, is pressed only as required with a high contact pressure for sealing within the groove 10, its relaxation phenomena are limited to a minimum.
- the sealing strip has excellent performance characteristics over a long period of use.
Description
Die Erfindung betrifft eine Dichtungsanordnung zur Abdichtung von zwei relativ schwenkbeweglich zueinander angeordneten Maschinenteilen, die durch eine Welle und ein die Welle mit radialem Abstand umschließendes Gehäuse gebildet sind, wobei der durch den Abstand gebildete Ringraum durch zumindest zwei Flügel in zumindest zwei in Umfangsrichtung benachbarte, gegeneinander abgedichtete und zur Einleitung der Schwenkbewegung wechselseitig druckbeaufschlagbare Kammern unterteilt ist, wobei die Fläche mit der Welle und/oder dem Gehäuse relativ starr verbunden sind, sich im wesentlichen entlang der gesamten axialen Ausdehnung der Kammern erstrecken und dem jeweils relativ beweglichen Maschinenteil bis auf einen Dichtspalt angenähert sind, umfassend jeweils eine Dichtleiste aus elastomerem Werkstoff, die in einer in Richtung des Dichtspalts geöffneten, im wesentlichen U-förmigen Nut der Flügel angeordnet ist, die Flügel umfangsseitig umschließt und das relativ schwenkbewegliche Maschinenteil unter elastischer Vorspannung mit einer Dichtfläche dichtend berührt.The invention relates to a sealing arrangement for sealing two machine parts which are arranged so as to be pivotable relative to one another and which are formed by a shaft and a housing enclosing the shaft at a radial distance, the annular space formed by the distance being separated from one another by at least two vanes in at least two circumferential directions sealed chambers which can be pressurized to initiate the pivoting movement, the surface being relatively rigidly connected to the shaft and / or the housing, extending essentially along the entire axial extent of the chambers and approximating the relatively movable machine part except for a sealing gap are, each comprising a sealing strip made of elastomeric material, which is arranged in an opening in the direction of the sealing gap, substantially U-shaped groove of the wing, enclosing the wing circumferentially and the relatively pivotable Mas chin part touched with elastic sealing with a sealing surface.
Eine derartige Dichtungsanordnung ist aus der DE-OS 14 50 302 bekannt. Die Dichtungsanordnung umfaßt eine druckabhängige Dichtung einer auf dem Umfang ungleich druckbeaufschlagten Welle, wobei der Flügel mit einer Dichtung versehen ist, die auf der zylindrischen Oberfläche der abzudichtenden Welle schleift. Dabei ist allerdings zu beachten, daß die Dichtung insbesondere zur Abdichtung höherer Drücke im Bereich von 350 bar und alternierender, beidseitiger Druckbeaufschlagung wenig befriedigende Gebrauchseigenschaften aufweist. Der Wellendurchtritt durch das Gehäuse wird separat abgedichtet, wobei zur Abdichtung ein Dichtring zur Anwendung gelangt, der aus einem nachgiebigen, leicht biegsamen und dennoch festen und verschleißfesten Material, wie beispielsweise PTFE, hergestellt ist.Such a sealing arrangement is known from DE-OS 14 50 302. The sealing arrangement comprises a pressure-dependent seal of a shaft which is unequally pressurized on the circumference, the wing being provided with a seal which grinds on the cylindrical surface of the shaft to be sealed. It should be noted, however, that the seal, particularly for sealing higher pressures in the range of 350 bar and alternating pressurization on both sides, has unsatisfactory performance properties. The shaft passage through the housing is sealed separately, whereby a sealing ring is used for sealing, which consists of a compliant, slightly flexible, yet strong and wear-resistant material, such as PTFE.
Eine ähnliche Dichtungsanordnung für eine Schwenkkolbenmaschine ist auch in die GB-A-1 059 030 offenbart, auf welcher der Oberbegriff des Anspruchs 1 beruht.A similar sealing arrangement for a swing piston machine is also disclosed in GB-A-1 059 030, on which the preamble of
Der Erfindung liegt die Aufgabe zugrunde, eine Dichtungsanordnung der vorbekannten Art derart weiterzuentwickeln, daß während einer langen Gebrauchsdauer eine sichere Abdichtung der Flügel gegenüber dem relativ beweglichen Maschinenteil erzielt wird und daß die Dichtleiste in radialer Richtung von Welle und Gehäuse eine Nachgiebigkeit aufweist, die ausreicht, herstellungsbedingte Toleranzen der Maschinenteile auszugleichen und eine gleichbleibend gute Abdichtung während einer langen Gebrauchsdauer zu gewährleisten. Außerdem soll die Anpreßkraft der Dichtleiste an die entsprechenden Dichtflächen proportional und selbsttätig an Druckänderungen in den angrenzenden Kammern angepaßt werden.The invention has for its object to further develop a sealing arrangement of the known type such that a secure sealing of the wing against the relatively movable machine part is achieved during a long period of use and that the sealing strip in the radial direction of the shaft and housing has a compliance that is sufficient, to compensate for manufacturing tolerances of the machine parts and to ensure a consistently good seal over a long period of use. In addition, the contact pressure of the sealing strip on the corresponding sealing surfaces should be proportionally and automatically adapted to pressure changes in the adjacent chambers.
Die Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen von Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.The object is achieved with the characterizing features of
Im Rahmen der vorliegenden Erfindung ist es vorgesehen, daß die Dichtleiste einen im wesentlichen S-förmigen Querschnitt aufweist und die seitlichen Begrenzungsflächen der Nut mit einstückig angeformten Abstandhaltern unter elastischer Vorspannung anliegend und den Nutgrund dichtend berührt und daß die Abstandhalter derart ausgebildet und angeordnet sind, daß im wesentlichen die gesamte Fläche der jeweiligen Flanken der Dichtleiste und die jeweils angrenzende Kammer gemeinsam druckbeaufschlagbar sind. Bei einer derartigen Ausgestaltung ist von Vorteil, daß durch den S-förmigen Querschnitt der Dichtleiste einerseits eine gute Nachgiebigkeit zum Ausgleich herstellungsbedingter Toleranzen in Richtung der Anpreßkraft zwischen dem Nutgrund und der abzudichtenden Fläche besteht. Andererseits wird durch die gleichzeitige Druckbeaufschlagung einer der Kammern und der angrenzenden Ausnehmung der Dichtleiste eine druckabhänige, verstärkte Anpressung einer Flanke der Dichtleiste an die jeweilige seitliche Begrenzungsfläche bedingt, die mit relativ niedrigerem Druck beaufschlagt ist. Durch die Druckbeaufschlagung des S-förmigen Querschnitts im Bereich seiner Flanken ergibt sich eine keilförmige Aufweitung der Ausnehmungen und somit eine stärkere Anpreßkraft und Abdichtwirkung gegenüber dem Raum mit relativ geringerer Druckbeaufschlagung. Verlagerungen der Dichtleiste im wesentlichen parallel zur Schwenkrichtung eines der beiden Maschinenteile wird dadurch verhindert, daß die Dichtleiste unter axialer Vorspannung innerhalb der Nut angeordnet ist. Relativbewegungen der Dichtleiste zu den Begrenzungsflächen und dem Nutgrund der Nut können dadurch weitgehend vermieden werden, so daß ein abrasiver Verschleiß der Dichtleiste in diesen Bereichen minimiert ist.In the context of the present invention, it is provided that the sealing strip has an essentially S-shaped cross section and the lateral boundary surfaces of the groove with integrally formed spacers are in contact with elastic prestressing and touches the groove base and that the spacers are designed and arranged such that essentially the entire area of the respective flanks of the sealing strip and the respectively adjacent chamber can be pressurized together. With such a configuration, it is advantageous that the S-shaped cross section of the sealing strip on the one hand provides good flexibility to compensate for manufacturing-related tolerances in the direction of the contact pressure between the groove base and the surface to be sealed. On the other hand, due to the simultaneous pressurization of one of the chambers and the adjacent recess of the sealing strip, a pressure-dependent, increased pressing of a flank of the sealing strip against the respective lateral boundary surface is caused, which is relative lower pressure is applied. The pressurization of the S-shaped cross-section in the area of its flanks results in a wedge-shaped widening of the recesses and thus a stronger contact pressure and sealing effect with respect to the room with a relatively low pressurization. Displacements of the sealing strip essentially parallel to the pivoting direction of one of the two machine parts is prevented by the sealing strip being arranged within the groove under axial prestress. Relative movements of the sealing strip to the boundary surfaces and the groove base of the groove can thereby be largely avoided, so that abrasive wear of the sealing strip is minimized in these areas.
Gemäß einer vorteilhaften Ausgestaltung ist es vorgesehen, daß die Dichtleiste entlang ihrer gesamten Erstreckung einen übereinstimmenden Querschnitt aufweist. Hinsichtlich einer gleichmäßig guten Abdichtung des umfangsseitig um jeden Flügel verlaufenden Dichtspalts, ist eine derartige Formgebung von hervorzuhebendem Vorteil. Außerdem werden durch eine derartige Ausgestaltung unterschiedlich starke Relaxationserscheinungen in einzelnen Teilbereichen der Dichtleiste vermieden, so daß die Dichtleiste während ihrer gesamten Gebrauchsdauer entlang ihrer gesamten Länge mit einer übereinstimmenden Anpreßkraft an die abzudichtende Fläche des relativ beweglichen Maschinenteils angepreßt wird. Um eine gleichmäßige Anpreßung der Dichtleiste und Abdichtung der beiden relativ schwenkbeweglich zueinander angeordneten Maschinenteile unabhängig von der Richtung der Schwenkbewegung zu erzielen, können die beiden Flanken der Dichtleiste zur Bildung des S-förmigen Profils mit übereinstimmend ausgebildeten Ausnehmungen versehen sein. Da die beiden Flanken dadurch eine im wesentlichen übereinstimmende hydraulisch wirksame Fläche aufweisen, ist bei abwechselnder Druckbeaufschlagung der einander benachbarten Kammern mit gleichhohem Druck die Anpreßkraft an der abzudichtenden Fläche und den statischen Dichtflächen innerhalb der Nut gleich groß.According to an advantageous embodiment, it is provided that the sealing strip has a matching cross section along its entire extent. With regard to a uniformly good sealing of the sealing gap running around the circumference of each wing, such a shape is of particular advantage. In addition, such a configuration avoids relaxation phenomena of different strengths in individual partial areas of the sealing strip, so that the sealing strip is pressed along its entire length with a corresponding contact pressure against the surface of the relatively movable machine part to be sealed during its entire service life. In order to achieve a uniform pressing of the sealing strip and sealing of the two machine parts which are arranged so as to be pivotable relative to one another regardless of the direction of the pivoting movement, the two flanks of the sealing strip can be provided with correspondingly designed recesses to form the S-shaped profile. Since the two flanks thereby have a substantially corresponding hydraulically effective surface, the pressure force on the surface to be sealed and the static sealing surfaces within the groove are of equal magnitude when the adjacent chambers are alternately pressurized.
Die Ausnehmungen können eine im wesentlichen U-förmig in Richtung der seitlichen Begrenzungsflächen der Nut geöffnetes Profil aufweisen. Bei der Ausgestaltung der Ausnehmungen ist zur Erzielung vorteilhafter Gebrauchseigenschaften der Dichtleiste darauf zu achten, daß die Ausnehmungen unter Vermeidung sprunghafter Richtungsänderungen erzeugt sind. Insbesondere der Nutgrund der Ausnehmungen sollte bogenförmig, beispielsweise halbkreisförmig begrenzt sein, um bei Druckbeaufschlagung der Ausnehmungen und deren Aufweitung Kerbwirkungen im Bereich der seitlichen Flanken der Nut wirkungsvoll zu reduzieren. Die Gefahr einer Beschädigung des Nutgrunds der Ausnehmungen ist dadurch während der gesamten Gebrauchsdauer der Dichtungsanordnung vernachlässigbar gering.The recesses can have an essentially U-shaped profile open in the direction of the lateral boundary surfaces of the groove. When designing the recesses, in order to achieve advantageous usage properties of the sealing strip, care must be taken that the recesses are produced while avoiding abrupt changes in direction. In particular, the groove base of the recesses should be arched, for example semicircular, in order to effectively reduce notch effects in the region of the lateral flanks of the groove when the recesses are pressurized and widened. The risk of damage to the groove base of the recesses is therefore negligible during the entire service life of the sealing arrangement.
Die Ausnehmungen können jeweils 0,3- bis 0,6-mal so breit sein, wie die Breite der Dichtleiste, wobei die Ausnehmungen bevorzugt jeweils 0,1- bis 0,4-mal so hoch sind, wie die Höhe der Dichtleiste. Weiter verbesserte Gebrauchseigenschaften werden erzielt, wenn die Ausnehmungen eine Breite aufweisen, die 0,5-mal so breit ist, wie die Breite der Dichtleiste, wobei sich die Ausnehmungen jeweils bis zur Mitte der Breite der Dichtleiste erstrecken. Der Kompromiß aus einer ausreichenden Nachgiebigkeit der Dichtleiste in Richtung der Anpreßkraft auf die abzudichtende Fläche des relativ beweglichen Maschinenteils und der Aufweitung der Flanke bei Druckbeaufschlagung in gleicher Richtung, ist bei einer derartigen Ausgestaltung besonders vorteilhaft.The recesses can each be 0.3 to 0.6 times as wide as the width of the sealing strip, the recesses preferably being 0.1 to 0.4 times as high as the height of the sealing strip. Further improved performance properties are achieved if the recesses have a width that is 0.5 times as wide as the width of the sealing strip, the recesses each extending to the middle of the width of the sealing strip. The compromise of sufficient flexibility of the sealing strip in the direction of the contact pressure on the surface to be sealed of the relatively movable machine part and the widening of the flank when pressure is applied in the same direction is particularly advantageous in such a configuration.
Das Verhältnis aus maximaler Breite und maximaler Höhe der Ausnehmungen kann vorteilhafter Weise 0,8 bis 1,2 betragen. Durch das nahezu quadratische Verhältnis aus Breite und Höhe der Ausnehmungen wird bei Druckbeaufschlagung der Ausnehmungen eine ausreichend große hydraulisch wirksame Fläche bereitgestellt, wobei die verformungsbedingten, mechanischen Belastungen in diesem Bereich der Dichtleiste durch eine derartige Formgebung außerordentlich gering sind.The ratio of the maximum width and maximum height of the recesses can advantageously be 0.8 to 1.2. Due to the almost square ratio of the width and height of the recesses, a sufficiently large hydraulically effective area is provided when the recesses are pressurized, the deformation-related mechanical loads in this area of the sealing strip being extraordinarily low due to such a shape.
Die Dichtleiste kann den Nutgrund der Nut mit zumindest zwei statisch beanspruchten Dichtflächen unter elastischer Vorspannung dichtend berühren, wobei die statisch belasteten Dichtflächen einander in Richtung der Breite der Dichtleiste mit Abstand benachbart zugeordnet sind. Die statisch beanspruchten Dichtflächen sind derart dimensioniert und gestaltet, daß sich bei Überdruckbeaufschlagung der einzelnen Flanken der Dichtleiste zur Erzielung der Schwenkbewegung der Welle und/oder des Gehäuses eine ausreichend hohe Anpreßkraft im Nutgrund ergibt. Die Sicherheit gegen Flüssigkeitsdurchtritt im Bereich der statischen Dichtfläche des Nutgrund von der Kammer relativ höheren Drucks in die Kammer relativ niedrigeren Drucks kann dadurch weiter erhöht werden, wenn der Abstand zwischen den beiden statisch belastete Dichtflächen mit einer Fettfüllung versehen ist und dadurch eine zusätzliche Flüssigkeitssperre bedingt ist.The sealing strip can sealingly touch the groove base of the groove with at least two statically stressed sealing surfaces under elastic prestress, the statically loaded sealing surfaces being spaced apart from one another in the direction of the width of the sealing strip. The statically stressed sealing surfaces are dimensioned and designed in such a way that when the individual flanks of the sealing strip are subjected to overpressure, a sufficiently high contact pressure results in the groove base to achieve the pivoting movement of the shaft and / or the housing. The security against liquid penetration in the area of the static sealing surface of the groove base from the chamber of relatively higher pressure into the chamber of relatively lower pressure can be further increased if the distance between the two statically loaded sealing surfaces is provided with a grease filling and an additional liquid barrier is thereby required .
Bei Verwendung der erfindungsgemäßen Dichtungsanordnung zur Abdichtung eines Schwenkmotors wirken sich die zuvor beschriebenen Vorteile besonders günstig auf die Gebrauchseigenschaften des gesamten Bauteils aus. Eine derartige Dichtungsanordnung kann zu Abdichtung von maximalen Drücken im Bereich von 350 bar eingesetzt werden. In Abhängigkeit von der Ausgestaltung des Schwenkmotors können damit hohe Drehmomente aufgebracht werden. Die erfindungsgemäße Dichtungsanordnung ist daher für die meisten Anwendungsfälle gut geeignet.When using the sealing arrangement according to the invention for sealing a swivel motor, the advantages described above have a particularly favorable effect on the usage properties of the entire component. Such a sealing arrangement can be used to seal maximum pressures in the range of 350 bar. Depending on the design of the swivel motor, high torques can thus be applied. The sealing arrangement according to the invention is therefore well suited for most applications.
Die dynamische Dichtfläche der Dichtleiste, die auf der Oberfläche des relativ beweglichen Maschinenteils abgestützt ist, kann durch zwei einander durchschneidende Kegelflächen begrenzt sein, die mit der Oberfläche des abzudichtenden Maschinenteils jeweils einen übereinstimmenden Winkel einschließen, der bevorzugt 120° bis 140° beträgt. Durch die übereinstimmenden Winkel der beiden Kegelflächen relativ zum abzudichtenden Maschinenteil, ist die Dichtwirkung der Dichtungsanordnung unabhängig von der Schwenkrichtung von übereinstimmend hoher Güte.The dynamic sealing surface of the sealing strip, which is supported on the surface of the relatively movable machine part, can be limited by two intersecting conical surfaces, each of which encloses a corresponding angle with the surface of the machine part to be sealed, which is preferably 120 ° to 140 °. Due to the matching angle of the two conical surfaces relative to the machine part to be sealed, the sealing effect of the sealing arrangement is of a consistently high quality, regardless of the pivoting direction.
Ein Ausführungsbeispiel der erfindungsgemäße Dichtungsanordnung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert.An embodiment of the sealing arrangement according to the invention is explained in more detail below with reference to the accompanying drawings.
Es zeigen:
- Fig. 1 einen Ausschnitt aus einem Schwenkmotor in längsgeschnittener Darstellung,
- Fig. 2 einen Querschnitt durch den in Fig. 1 gezeigten Schwenkmotor und
- Fig. 3 einen vergrößerten Ausschnitt aus Fig. 2, der die Dichtleiste innerhalb der Nut zeigt, wobei die Dichtleiste mit dem Nutgrund und der abzudichtenden Fläche dichtend in Eingriff ist.
- 1 shows a section of a swivel motor in a longitudinal section,
- Fig. 2 shows a cross section through the swing motor shown in Fig. 1 and
- 3 shows an enlarged detail from FIG. 2, which shows the sealing strip inside the groove, the sealing strip being sealingly engaged with the groove base and the surface to be sealed.
In Fig. 1 ist ein Ausschnitt aus einem Schwenkmotor gezeigt, umfassend ein Gehäuse 2, das als Stator ausgebildet ist und eine Welle 1, die den Rotor bildet. Die Welle 2 ist stufenförmig abgesetzt und wird im Bereich ihres Absatzes durch eine Drehdruckdichtung 25 abgedichtet.1 shows a detail from a swivel motor, comprising a
In Fig. 2 ist zu erkennen, daß im Ringraum 3, der durch die Welle 1 und das Gehäuse 2 begrenzt wird, in diesem Ausführungsbeispiel vier Flügel, 4, 5, 26, 27 angeordnet sind, wobei die beiden Flügel 5, 27 drehfest mit der Welle 1 verbunden sind und die Flügel 4, 26 einstückige Bestandteile des Gehäuses 2 bilden und die Oberfläche des benachbarten Maschinenteils dichtend berühren. Durch die Flügel 4, 5, 26, 27 sind Kammern 6, 7, 28, 29 gebildet, wobei die Kammerpaare 6 und 28 sowie 7 und 29 paarweise druckbeaufschlagbar sind, um die Welle 1 und das Gehäuse 2 des Schwenkmotors relativ zueinander zu schwenken.In Fig. 2 it can be seen that in the
In Fig. 3 ist ein aus Fig. 2 vergrößerter Ausschnitt X gezeigt, wobei zu erkennen ist, daß die Dichtleiste 9 innerhalb der Nut 10 ein im wesentlichen S-förmiges Profil aufweist und die seitlichen Begrenzungsflächen 12, 13 der Nut 10 mit Abstandhaltern 14, 15 unter Vorspannung anliegend berührt. Die Abstandhalter 14, 15 sind in Längsrichtung der Dichtleiste zumindest einmal unterbrochen, so daß die Ausnehmungen 19, 20 bedarfsweise mit dem Druck aus den jeweils angrenzenden Kammern 6, 7 beaufschlagbar sind. Gegenüber dem Nutgrund 16 ist die Dichtleiste 9 mit zwei statisch beanspruchten Dichtflächen 23, 24 abgestützt, die einander mit Abstand benachbart zugeordnet sind. Abhängig von der Größe des relativen Überdrucks innerhalb der Kammern 6, 7 ergibt sich durch die Druckbeaufschlagung der Ausnehmungen 19, 20 deren Aufweitung, die zu einer zusätzlichen Anpreßkraft der Dichtleiste 9 innerhalb der Nut 10, bestehend aus dem Nutgrund 16 und den beiden seitlichen Begrenzungsflächen 12, 13 führt. Dadurch, daß die vollständig aus elastomerem Werkstoff bestehende Dichtleiste nur bedarfsweise mit einer hohen Anpreßkraft zur Abdichtung innerhalb der Nut 10 verpreßt wird, sind deren Relaxationserscheinungen auf ein Minimum beschränkt.FIG. 3 shows an enlarged section X from FIG. 2, wherein it can be seen that the
Die Dichtleiste weist ausgezeichnete Gebrauchseigenschaften während einer langen Gebrauchsdauer auf.The sealing strip has excellent performance characteristics over a long period of use.
Claims (9)
- A sealing arrangement for sealing off two machine parts which are arranged so as to be pivotable relative to one another and are formed by a shaft and a housing which surrounds the shaft with radial spacing, the annular space formed by the spacing being subdivided by at least two wings into at least two chambers which are adjacent in the circumferential direction, are sealed off against one another, and can be pressurized alternately to introduce the pivoting movement, the wings being relatively rigidly connected to the shaft and/or the housing, extending substantially along the entire axial extent of the chambers, and respectively approaching the relatively movable machine part whilst leaving a sealing gap, respectively comprising a sealing strip of elastomeric material, which sealing strip is arranged in a substantially U-shaped groove of the wings, the said groove being open in the direction of the sealing gap, surrounds the wings on the circumferential side and, with a sealing surface, touches the relatively pivotable machine part in a sealing manner under elastic prestress, characterized in that the sealing strip (9) has a substantially S-shaped cross-section and touches the lateral boundary surfaces (12, 13) of the groove (10), bearing against them with integrally moulded-on spacers (14, 15) under elastic prestress and touches the groove base (16) in a sealing manner, and in that the spacers (14, 15) are designed and arranged in such a way that substantially the entire surface of the respective flanks (17, 18) of the sealing strip (9) and the respectively adjacent chambers (6, 7) can be pressurized together.
- A sealing arrangement according to claim 1, characterized in that the sealing strip (9) has a corresponding cross-section along its entire extent.
- A sealing arrangement according to either of claims 1 and 2, characterized in that the two flanks (17, 18) of the sealing strip (9) are provided with correspondingly designed recesses (19, 20) to form the S-shaped profile.
- A sealing arrangement according to claim 3, characterized in that the recesses (19, 20) have a profile which is open substantially in a U-shape in the direction of the lateral boundary surfaces (12, 13) of the groove (10).
- A sealing arrangement according to either of claims 3 and 4, characterized in that the recesses (19, 20) are respectively 0.3 to 0.6 times as wide as the width (21) of the sealing strip (9).
- A sealing arrangement according to any of claims 3 to 5, characterized in that the recesses (19, 20) are respectively 0.1 to 0.4 times as high as the height (22) of the sealing strip (9).
- A sealing arrangement according to either of claims 5 and 6, characterized in that the ratio of the maximum width (21) and the maximum height (22) of the recesses (19, 20) is from 0.8 to 1.2.
- A sealing arrangement according to any of claims 1 to 7, characterized in that the sealing strip (9) touches the groove base (16) of the groove (10) in a sealing manner with at least two statically stressed sealing surfaces (23, 24) under elastic prestress, and in that the statically stressed sealing surfaces (23, 24) are arranged adjacent to one another with spacing in the direction of the width (21) of the sealing strip (9).
- A sealing arrangement according to any of claims 1 to 8, characterized by the use for sealing off a pivoting motor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4339527 | 1993-11-19 | ||
| DE4339527A DE4339527C1 (en) | 1993-11-19 | 1993-11-19 | Sealing arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0656462A1 EP0656462A1 (en) | 1995-06-07 |
| EP0656462B1 true EP0656462B1 (en) | 1996-08-14 |
Family
ID=6502990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94108017A Expired - Lifetime EP0656462B1 (en) | 1993-11-19 | 1994-05-25 | Sealing device |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0656462B1 (en) |
| DE (2) | DE4339527C1 (en) |
| ES (1) | ES2092359T3 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19926644C1 (en) * | 1999-06-11 | 2000-08-24 | Freudenberg Carl Fa | Seal arrangement between rotor and stator of pivot drive, has clamp element enclosed nearly completely by at least two seal angles, whose ends are arranged in small distance |
| DE19961239C2 (en) * | 1999-12-18 | 2002-09-19 | Freudenberg Carl Kg | sealing arrangement |
| DE10242765A1 (en) * | 2002-09-14 | 2004-03-18 | Bayerische Motoren Werke Ag | Sealing plate for separation of working chambers of oscillating motor is manufactured in one piece from plastic and/or rubber and/or metal, and corrugated in radial and/or axial direction to compensate for thermal expansion |
| DE10358519B4 (en) * | 2003-12-13 | 2012-10-31 | Bayerische Motoren Werke Aktiengesellschaft | Sealing element for swing motor |
| DE102004032747A1 (en) * | 2004-07-07 | 2006-01-26 | Zf Friedrichshafen Ag | swing motor |
| DE102005017435A1 (en) | 2005-04-15 | 2006-10-19 | Schaeffler Kg | Device for the variable adjustment of the timing of gas exchange valves of an internal combustion engine |
| DE102005017436A1 (en) * | 2005-04-15 | 2006-10-19 | Schaeffler Kg | Device for adjusting the camshaft of an internal combustion engine |
| JP5199271B2 (en) * | 2006-12-01 | 2013-05-15 | イグゼティック・バート・ホムブルグ・ゲーエムベーハー | Sealing device |
| DE102008016749A1 (en) * | 2008-03-31 | 2009-10-08 | Zf Friedrichshafen Ag | Window seal, in particular for a swivel motor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3128679A (en) * | 1962-04-26 | 1964-04-14 | Roto Actuator Corp | Sealing and stop means for fluid motors |
| GB1059030A (en) * | 1963-11-29 | 1967-02-15 | Dowty Hydraulic Units Ltd | Oscillatory fluid-pressure machines |
| DE2221131A1 (en) * | 1972-04-28 | 1973-11-08 | Arno Fischer | ROTATING PISTON MACHINE |
| US3873249A (en) * | 1973-09-24 | 1975-03-25 | Ford Motor Co | Seal for rotary combustion engine |
| DE3575007D1 (en) * | 1984-03-23 | 1990-02-01 | Volkswagenwerk Ag | GASKET FOR A DISPLACEMENT MACHINE FOR COMPRESSIBLE MEDIA. |
| IT224734Z2 (en) * | 1991-05-07 | 1996-06-27 | GEAR MACHINE OPERATING AS A PUMP OR MOTOR. |
-
1993
- 1993-11-19 DE DE4339527A patent/DE4339527C1/en not_active Expired - Lifetime
-
1994
- 1994-05-25 ES ES94108017T patent/ES2092359T3/en not_active Expired - Lifetime
- 1994-05-25 DE DE59400496T patent/DE59400496D1/en not_active Expired - Fee Related
- 1994-05-25 EP EP94108017A patent/EP0656462B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59400496D1 (en) | 1996-09-19 |
| ES2092359T3 (en) | 1996-11-16 |
| DE4339527C1 (en) | 1995-02-16 |
| EP0656462A1 (en) | 1995-06-07 |
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