EP2195563A1 - Sealing arrangement for a bearing - Google Patents

Sealing arrangement for a bearing

Info

Publication number
EP2195563A1
EP2195563A1 EP08801239A EP08801239A EP2195563A1 EP 2195563 A1 EP2195563 A1 EP 2195563A1 EP 08801239 A EP08801239 A EP 08801239A EP 08801239 A EP08801239 A EP 08801239A EP 2195563 A1 EP2195563 A1 EP 2195563A1
Authority
EP
European Patent Office
Prior art keywords
sealing
bearing ring
bearing
arrangement according
seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP08801239A
Other languages
German (de)
French (fr)
Inventor
Christian PRÖSCHEL
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2195563A1 publication Critical patent/EP2195563A1/en
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
    • F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
    • F16J15/3264—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals the elements being separable from each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/541—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing
    • F16C19/542—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing with two rolling bearings with angular contact
    • F16C19/543—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing with two rolling bearings with angular contact in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/56—Systems consisting of a plurality of bearings with rolling friction in which the rolling bodies of one bearing differ in diameter from those of another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
    • F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/43—Aeroplanes; Helicopters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7813—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for tapered roller bearings

Definitions

  • the invention is in the field of rolling bearings and plain bearings and relates to a seal assembly for a bearing in which a second bearing ring is relatively rotatable to a first bearing ring with interposition of rolling elements or a sliding surface.
  • the first bearing ring may be formed as a bearing outer ring and received by a bearing outer ring, while the second bearing ring on a rotating machine element, for example, on a shaft or axle, may be applied.
  • the quality of storage and thus the life or fatigue strength of a bearing is very much dependent on the quality and undisturbed rolling or sliding of the corresponding Wälz- or bearing surfaces.
  • a roller bearing thus depends on an unimpaired rolling of the rolling elements on the associated running surfaces of the first and second bearing ring. This rolling motion can be disturbed by undesirable penetrating foreign bodies, such as dirt or debris, and thus at worst compromise the reliability of the camp and its life can be shortened.
  • an object of the present invention is to provide a sealing arrangement which is characterized by a high or increased life and high reliability even in polluted or aggressive environment.
  • the seal assembly provides a circumferential circumferential circumferential seal, which is arranged in the region of the first bearing ring.
  • the second bearing ring is provided with a circumferential sealing surface.
  • At least two circumferential sealing lips of the seal are sealingly on the sealing surface.
  • a particular advantage of the invention is that with a relatively simple additional component, the often costly and high quality storage is permanently protected.
  • Another advantage of the invention is that the independently acting sealing lips configured differently, in particular can be optimized according to different requirements.
  • At least one sealing lip is designed to be resilient in terms of film elasticity.
  • film-elastically sprung is understood to mean a sealing lip which, as it were, is designed as a cantilever-like extension and resiliently rests on the sealing surface with its free end due to elastic changes in its geometry.
  • a volume-elastic suspension means a material suspension of the sealing lip, which is realized by corresponding elastic deformation of the sealing lip material.
  • the sealing effect can be optimized and influenced by a spring element presses the sealing lip on the sealing surface.
  • the spring element may be a circumferential spiral spring, preferably a spiral spring.
  • a preferred development of the invention provides that abut the at least two sealing lips on an axially extending portion of the sealing surface and that the seal has a further sealing lip, the a radially extending sealing surface is present.
  • the sealing surface may be formed by partial regions of the surface of the second bearing ring.
  • a preferred embodiment of the invention in this context provides that at least part of the sealing surface is formed by an axial extension of the second bearing ring.
  • This extension may preferably be formed as an integral part of the material of the second bearing ring and extend, for example, like a sleeve in the axial direction to the outside of the storage. Such an extension is also referred to as a board.
  • the sealing surface may also be formed on a molding element. It is particularly preferred if at least part of the sealing surface is formed on a sealing plate, which is applied to an axial extension (board) of the second bearing ring.
  • FIG. 1 schematically shows a mounting situation of a sealing arrangement according to the invention
  • FIG. 2 shows a first sealing arrangement according to the invention in detail
  • FIG. 3 shows a second sealing arrangement according to the invention in detail.
  • FIG. 1 shows a sealing arrangement for a bearing which comprises a first bearing ring 1 and a second bearing ring 2 rotating relative to it.
  • a support 3 of the seal assembly is made of stainless steel and is in a bore 4 a bearing outer ring housing 5 is pressed.
  • a corresponding second bearing with a similar seal arrangement is shown on the right side.
  • the sealing arrangement which is suitable for use in accordance with FIG. 1 can have a carrier 3 which is "P-shaped" in cross-section.
  • the sealing ring has a first sealing lip 9 and a second sealing lip 10.
  • the first sealing lip is in the form of a thin, protruding, cross-section kragliniartigen extension 12 is formed.
  • This training is also referred to as elastic film elastic because the extension 12 in the connection area 13 to the remaining rubber material 14 in the manner of a hinge in the direction of arrow 15 is deflectable.
  • the second sealing lip 10 is formed by a peripheral material tip 18, which forms with its tip substantially linear contact 19 with the surface 22 of the second bearing ring 2 (see also FIG.
  • the surface is formed by a sleeve-shaped extension 24 extending outward in the axial direction 23.
  • a circumferential spiral spring 30 is provided which by slight bending a spring force in the radial direction of the Extensions 24 exerts and thus the second sealing lip 10 presses.
  • FIG. 3 shows a variant of a sealing arrangement for a bearing, wherein a carrier plate 30 is pressed into the bore 4 of the bearing outer ring housing 5 (cf., also FIG.
  • the support plate 30 holds a circumferential seal 31, which consists of an elastic rubber material.
  • the seal 31 has a first sealing lip 32 which is formed in already explained in connection with Figure 2 design as a film elastic resilient sealing lip.
  • a second sealing lip 33 is pressed onto the surface of a sealing plate 35 by means of a spiral spring 34.
  • the first sealing lip 32 runs on the only indicated surface 36 of the second bearing ring.
  • the surface 36 is formed by the lateral surface of an axial, sleeve-shaped extension (board).
  • the sealing plate 35 is arranged substantially at right angles and pushed with its inner portion on the extension.
  • a radially extending second region 37 of the sealing plate forms a further surface 38, on which a further (third) sealing lip 39 is sealingly supported and due to its kragliniartigen, circumferential geometry resiliently elastic film.
  • the surface of this region of the sealing plate forms an inso- far a radial sealing surface 40th
  • the present invention is preferably used in aircraft landing gear, because it depends in particular on a reliable, even under extreme operating conditions durable seal the suspension mounts.
  • an improved protection against the penetration of external media for example, dirt or water
  • the suction of dirt and foreign particles is also reliably prevented, in particular as a result of the cooling of the storage or during pressure changes.
  • the storage interior is sealed from the environment, so that in the interest of improved environmental protection, the risk of leaking oil or fat is minimized.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The invention relates to a sealing arrangement which is characterized by a long or increased service life and high reliability even in soiled or aggressive surroundings. The sealing arrangement for a bearing which comprises a first bearing ring (1) and second bearing (2), rotatable relative to the first bearing ring (1), has a seal (7) that is arranged in the region of the first bearing ring (1) and that extends in the direction of the bearing periphery. The second bearing ring (2) has a peripheral sealing surface (22) and the seal (7) has at least two peripheral sealing lips (9, 10) that sealingly rest on the sealing surface (22).

Description

Bezeichnung der Erfindung Name of the invention
Dichtungsanordnung für ein LagerSealing arrangement for a bearing
Beschreibungdescription
Gebiet der ErfindungField of the invention
Die Erfindung liegt auf dem Gebiet der Wälzlager und Gleitlager und betrifft eine Dichtungsanordnung für ein Lager, bei dem zu einem ersten Lagerring unter Zwischenanordnung von Wälzkörpern oder einer Gleitfläche ein zweiter Lagerring relativ drehbar ist.The invention is in the field of rolling bearings and plain bearings and relates to a seal assembly for a bearing in which a second bearing ring is relatively rotatable to a first bearing ring with interposition of rolling elements or a sliding surface.
Derartige Lager finden vielfältige Anwendung, wobei beispielsweise der erste Lagerring als Lageraußenring ausgebildet und von einem Lageraußenringgehäuse aufgenommen sein kann, während der zweite Lagerring auf einem rotierenden Maschinenelement, beispielsweise auf einer Welle oder Achse, aufgebracht sein kann.Such bearings find a variety of applications, for example, the first bearing ring may be formed as a bearing outer ring and received by a bearing outer ring, while the second bearing ring on a rotating machine element, for example, on a shaft or axle, may be applied.
Die Lagerungsqualität und mithin die Lebensdauer bzw. Dauerfestigkeit einer Lagerung ist ganz erheblich von der Qualität und dem ungestörten Abrollen bzw. Gleiten der korrespondierenden Wälz- bzw. Lagerflächen abhängig. Bei einem Wälzlager kommt es also auf ein unbeeinträchtigtes Abrollen der Wälzkörper auf den zugeordneten Laufflächen des ersten bzw. zweiten Lagerringes an. Diese Abwälzbewegung kann durch unerwünscht eindringende Fremdkörper, wie beispielsweise Schmutz oder Abriebpartikel, gestört und damit ungünstigstenfalls die Zuverlässigkeit des Lagers gefährdet bzw. dessen Lebensdauer verkürzt werden.The quality of storage and thus the life or fatigue strength of a bearing is very much dependent on the quality and undisturbed rolling or sliding of the corresponding Wälz- or bearing surfaces. at A roller bearing thus depends on an unimpaired rolling of the rolling elements on the associated running surfaces of the first and second bearing ring. This rolling motion can be disturbed by undesirable penetrating foreign bodies, such as dirt or debris, and thus at worst compromise the reliability of the camp and its life can be shortened.
Diese Anforderungen sind besonders bedeutsam bei entsprechend verschmutzungsträchtigen Einsatzbereichen, insbesondere bei der Radlagerung von Fluggeräten/Flugzeugen. Hier kann es z.B. während des Start- bzw. Landevorgangs einerseits zu einer sehr starken Beschleunigung der Fahr- werksreifen und damit der Radlager in mitunter verschmutzter Umgebung (Start-/Landebahn) kommen. Hinzu kommen bei Fluggeräten aufgrund der in höheren Flughöhen auftretenden Druckänderungen und infolge thermischer Belastungen (Erhitzung der Bremsscheiben) und der damit einhergehenden Volumenänderungen Druckausgleichsvorgänge, die Fremdkörper in die Lagerungen einsaugen können.These requirements are particularly important in accordance with pollution-intensive applications, especially in the wheel storage of aircraft / aircraft. Here it can be e.g. During the takeoff or landing, on the one hand, there is a very strong acceleration of the wheels and thus of the wheel bearings in a sometimes polluted environment (runway). In addition, in aircraft due to the pressure changes occurring at higher altitudes and due to thermal loads (heating of the brake discs) and the associated changes in volume pressure equalization processes that can suck foreign bodies in the bearings.
Vor diesem Hintergrund besteht eine Aufgabe der vorliegenden Erfindung in der Schaffung einer Dichtungsanordnung, die sich durch eine hohe bzw. erhöhte Lebensdauer und hohe Zuverlässigkeit auch in verschmutzter bzw. aggressiver Umgebung auszeichnet.Against this background, an object of the present invention is to provide a sealing arrangement which is characterized by a high or increased life and high reliability even in polluted or aggressive environment.
Diese Aufgabe wird erfindungsgemäß durch eine Dichtungsanordnung mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a seal assembly with the features of claim 1.
Demgemäß sieht die erfindungsgemäße Dichtungsanordnung eine in La- gerumfangsrichtung umlaufende Dichtung vor, die im Bereich des ersten Lagerrings angeordnet ist. Der zweite Lagerring ist mit einer umlaufenden Dichtfläche versehen. Zumindest zwei umlaufende Dichtlippen der Dichtung liegen dichtend auf der Dichtfläche auf. Durch die Anordnung von zwei Dichtungen, die bezogen auf den sich von dem Lagerungsinnenbereich ("Schmierseite") zur anderen, außenliegenden Lagerseite ("Schmutzsei- te")erstreckenden Dichtungsweg nacheinander und bevorzugt beabstandet angeordnet sind, wird eine besonders zuverlässige und langlebige Dichtungswirkung erzielt. Diese Dichtungswirkung trägt dazu bei, dass die Lage- rung auch in besonderen Beanspruchungsfällen, beispielsweise im Zusammenhang mit dem eingangs beschriebenen Druckausgleich und der häufig staubigen Umgebung einer Start- bzw. Landebahn bei einem Flugzeug, zuverlässig und ausreichend geschützt ist. Dadurch ergibt sich eine erhöhte Lebensdauer bzw. Zuverlässigkeit der Lagerung, was sich in reduzierten Wartungskosten und in geringeren damit verbundenen Logistikkosten für den Anwender bzw. Betreiber auswirkt.Accordingly, the seal assembly according to the invention provides a circumferential circumferential circumferential seal, which is arranged in the region of the first bearing ring. The second bearing ring is provided with a circumferential sealing surface. At least two circumferential sealing lips of the seal are sealingly on the sealing surface. By the arrangement of two seals, based on the itself from the storage interior ("Lubrication side") to the other, outer bearing side ("dirt side" te) extending sealing path successively and preferably spaced apart, a particularly reliable and durable sealing effect is achieved. This sealing effect contributes to ensuring that the bearing is reliably and adequately protected even in special cases of stress, for example in connection with the pressure equalization described above and the frequently dusty environment of a runway in an aircraft. This results in an increased life or reliability of storage, resulting in reduced maintenance costs and lower associated logistics costs for the user or operator.
Ein besonderer Vorteil der Erfindung besteht darin, dass mit einem vergleichsweise einfachen zusätzlichen Bauteil die häufig kostenintensive und hochwertige Lagerung dauerhaft geschützt ist. Ein weiterer Vorteil der Erfindung besteht darin, dass die unabhängig voneinander agierenden Dichtlippen unterschiedlich ausgestaltet, insbesondere nach unterschiedlichen Anforderungen optimiert sein können.A particular advantage of the invention is that with a relatively simple additional component, the often costly and high quality storage is permanently protected. Another advantage of the invention is that the independently acting sealing lips configured differently, in particular can be optimized according to different requirements.
Eine in diesem Zusammenhang vorteilhafte Ausgestaltung der Erfindung sieht vor, dass zumindest eine Dichtlippe filmelastisch federnd ausgebildet ist. Unter filmelastisch gefedert ist im Rahmen der Erfindung eine Dichtungslippe zu verstehen, die umlaufend quasi als kragträgerartiger Fortsatz ausgebildet ist und aufgrund elastischer Änderungen ihrer Geometrie mit ihrem freien Ende federnd auf der Dichtfläche aufliegt.An advantageous embodiment of the invention in this context provides that at least one sealing lip is designed to be resilient in terms of film elasticity. In the context of the invention, film-elastically sprung is understood to mean a sealing lip which, as it were, is designed as a cantilever-like extension and resiliently rests on the sealing surface with its free end due to elastic changes in its geometry.
Eine alternative oder ergänzende Ausführung der Erfindung sieht vorteilhafterweise vor, dass zumindest eine Dichtlippe volumenelastisch federnd ausgebildet ist. Unter einer volumenelastischen Federung ist eine Materialfede- rung der Dichtlippe zu verstehen, die durch entsprechende elastische Verformung des Dichtlippenmaterials realisiert ist. Nach einer vorteilhaften Weiterbildung der Erfindung kann die Dichtungswirkung optimiert und beeinflusst werden, indem ein Federelement die Dichtlippe auf die Dichtfläche presst. Dabei kann das Federelement eine umlaufende Biegefeder, bevorzugt eine Spiralfeder, sein.An alternative or additional embodiment of the invention advantageously provides that at least one sealing lip is designed to be resilient in terms of volume. A volume-elastic suspension means a material suspension of the sealing lip, which is realized by corresponding elastic deformation of the sealing lip material. According to an advantageous embodiment of the invention, the sealing effect can be optimized and influenced by a spring element presses the sealing lip on the sealing surface. In this case, the spring element may be a circumferential spiral spring, preferably a spiral spring.
Zur weiteren Erhöhung der Dichtungswirkung, insbesondere auch in einer zweiten (der radialen) Dimension, sieht eine bevorzugte Fortbildung der Erfindung vor, dass die mindestens zwei Dichtlippen an einem sich axial erstreckenden Abschnitt der Dichtfläche anliegen und dass die Dichtung eine weitere Dichtlippe aufweist, die an einer sich radial erstreckenden Dichtfläche anliegt.To further increase the sealing effect, in particular in a second (the radial) dimension, a preferred development of the invention provides that abut the at least two sealing lips on an axially extending portion of the sealing surface and that the seal has a further sealing lip, the a radially extending sealing surface is present.
Grundsätzlich kann die Dichtfläche von Teilbereichen der Oberfläche des zweiten Lagerringes gebildet sein. Eine in diesem Zusammenhang bevorzug- te Ausgestaltung der Erfindung sieht vor, dass zumindest ein Teil der Dichtfläche von einem axialen Fortsatz des zweiten Lagerringes gebildet ist. Dieser Fortsatz kann bevorzugt als integraler Bestandteil aus dem Material des zweiten Lagerringes gebildet sein und sich beispielsweise hülsenartig in Axialrichtung nach außerhalb der Lagerung erstrecken. Ein derartiger Fortsatz wird auch als Board bezeichnet.In principle, the sealing surface may be formed by partial regions of the surface of the second bearing ring. A preferred embodiment of the invention in this context provides that at least part of the sealing surface is formed by an axial extension of the second bearing ring. This extension may preferably be formed as an integral part of the material of the second bearing ring and extend, for example, like a sleeve in the axial direction to the outside of the storage. Such an extension is also referred to as a board.
Um die Gleiteigenschaften der Dichtlippe bzw. der Dichtlippen auf der Dichtungsfläche weiter optimieren zu können, kann die Dichtfläche auch auf einem Formelement ausgebildet sein. Besonders bevorzugt ist dabei, wenn zumindest ein Teil der Dichtfläche auf einem Dichtblech ausgebildet ist, das auf einen axialen Fortsatz (Board) des zweiten Lagerringes aufgebracht ist.In order to further optimize the sliding properties of the sealing lip or the sealing lips on the sealing surface, the sealing surface may also be formed on a molding element. It is particularly preferred if at least part of the sealing surface is formed on a sealing plate, which is applied to an axial extension (board) of the second bearing ring.
Um die Dichtung in montagetechnisch besonders bevorzugter Weise mit dem ersten Lagerring zu verbinden, ist vorgesehen, dass die umlaufende Dichtung in einer stirnseitigen Aufnahme des ersten Lagerringes gehalten bzw. angeordnet ist. Ausführungsbeispiele und weitere Vorteile der Erfindung werden nachfolgend anhand der Zeichnung weiter erläutert. Es zeigen dabei:In order to connect the seal in mounting technology particularly preferred manner with the first bearing ring, it is provided that the circumferential seal is held or arranged in an end-side receptacle of the first bearing ring. Embodiments and further advantages of the invention will be explained below with reference to the drawing. It shows:
Figur 1 schematisch eine Einbausituation einer erfindungsgemäßen Dichtungsanordnung,FIG. 1 schematically shows a mounting situation of a sealing arrangement according to the invention,
Figur 2 eine erste erfindungsgemäße Dichtungsanordnung im Detail undFigure 2 shows a first sealing arrangement according to the invention in detail and
Figur 3 eine zweite erfindungsgemäße Dichtungsanordnung im Detail.3 shows a second sealing arrangement according to the invention in detail.
In den Figuren sind gleiche oder funktionsgleiche Elemente mit denselben Bezugszeichen versehen.In the figures, identical or functionally identical elements are provided with the same reference numerals.
Figur 1 zeigt eine Dichtungsanordnung für ein Lager, das einen ersten Lagerring 1 und einen relativ zu diesem rotierenden zweiten Lagerring 2 um- fasst. Ein Träger 3 der Dichtungsanordnung besteht aus rostfreiem Stahl und ist in eine Bohrung 4 eine Lageraußenringgehäuses 5 eingepresst. In der dargestellten Lagerung ist auf der rechten Seite ein entsprechendes, zweites Lager mit ähnlicher Dichtungsanordnung gezeigt.FIG. 1 shows a sealing arrangement for a bearing which comprises a first bearing ring 1 and a second bearing ring 2 rotating relative to it. A support 3 of the seal assembly is made of stainless steel and is in a bore 4 a bearing outer ring housing 5 is pressed. In the illustrated storage, a corresponding second bearing with a similar seal arrangement is shown on the right side.
Gemäß Figur 2 kann die für einen Einsatz gemäß Figur 1 geeignete Dichtungsanordnung einen Träger 3 aufweisen, der im Querschnitt „P-förmig" ausgebildet ist. Im Fußbereich des „P" ist ein umlaufender Dichtring 7 aus Gummi in einem Verbindungsbereich 8 fixiert. Der Dichtring weist eine erste Dichtlippe 9 und eine zweite Dichtlippe 10 auf. Die erste Dichtlippe ist in Form eines dünnen, überstehenden, im Querschnitt kragträgerartigen Fortsatzes 12 ausgebildet. Diese Ausbildung wird auch als filmelastisch federnd bezeichnet, weil der Fortsatz 12 im Anschlussbereich 13 an das übrige Gummimaterial 14 in Art eines Scharniers in Pfeilrichtung 15 auslenkbar ist. Die zweite Dichtlippe 10 ist von einer umlaufenden Materialspitze 18 gebildet, die mit ihrer Spitze im Wesentlichen linienförmigen Kontakt 19 mit der Oberfläche 22 des zweiten Lagerrings 2 bildet (vgl. auch Figur 1 ). Die Oberfläche ist von einem in axialer Richtung 23 sich nach außen erstreckenden, hülsenförmigen Fortsatz 24 gebildet. Wenn sich der zweite Lagerring um die Längsachse dreht, gleiten die Dichtlippen 9, 10 auf der Oberfläche des Fortsatzes 24. Um die Dichtungswirkung der zweiten Lippe zu erhöhen, ist eine umlaufende Spiralfeder 30 vorgesehen, die durch leichte Aufbiegung eine Federkraft in radialer Richtung auf den Fortsatz 24 ausübt und damit die zweite Dichtlippe 10 anpresst.2, the sealing arrangement which is suitable for use in accordance with FIG. 1 can have a carrier 3 which is "P-shaped" in cross-section. The sealing ring has a first sealing lip 9 and a second sealing lip 10. The first sealing lip is in the form of a thin, protruding, cross-section kragträgerartigen extension 12 is formed. This training is also referred to as elastic film elastic because the extension 12 in the connection area 13 to the remaining rubber material 14 in the manner of a hinge in the direction of arrow 15 is deflectable. The second sealing lip 10 is formed by a peripheral material tip 18, which forms with its tip substantially linear contact 19 with the surface 22 of the second bearing ring 2 (see also FIG. The surface is formed by a sleeve-shaped extension 24 extending outward in the axial direction 23. When the second bearing ring rotates about the longitudinal axis, slide the sealing lips 9, 10 on the surface of the extension 24. In order to increase the sealing effect of the second lip, a circumferential spiral spring 30 is provided which by slight bending a spring force in the radial direction of the Extensions 24 exerts and thus the second sealing lip 10 presses.
Mit dieser Dichtungsanordnung ist bereits eine hervorragende, staub- und mediendichte Abdichtung des Innenbereichs 26 der Lageranordnung gegenüber dem Außenbereich 27 gewährleistet.With this seal arrangement, an excellent, dustproof and media-tight seal of the inner region 26 of the bearing arrangement with respect to the outer region 27 is already ensured.
Figur 3 zeigt eine Variante einer Dichtungsanordnung für ein Lager, wobei ein Trägerblech 30 in die Bohrung 4 des Lageraußenringgehäuses 5 (vgl. auch Figur 1 ) eingepresst ist. Das Trägerblech 30 hält eine umlaufende Dichtung 31 , die aus einem elastischen Gummimaterial besteht. Die Dichtung 31 weist eine erste Dichtlippe 32 auf, die in bereits in Zusammenhang mit Figur 2 ausführlich erläuterter Gestaltung als filmelastisch federnde Dichtlippe ausgebildet ist. Eine zweite Dichtlippe 33 ist wie vorstehend bereits ausführlich geschildert mittels einer Spiralfeder 34 auf die Oberfläche eines Dichtungsbleches 35 gepresst. Die erste Dichtlippe 32 läuft auf der nur angedeu- teten Oberfläche 36 des zweiten Lagerringes. Die Oberfläche 36 ist von der Mantelfläche eines axialen, hülsenförmigen Fortsatzes (Board) ausgebildet. Das Dichtungsblech 35 ist im Wesentlichen rechtwinklig angeordnet und mit seinem inneren Bereich auf den Fortsatz aufgeschoben. Ein sich radial erstreckender zweiter Bereich 37 des Dichtungsblechs bildet eine weitere Oberfläche 38, auf der sich eine weitere (dritte) Dichtlippe 39 dichtend abstützt und aufgrund ihrer kragträgerartigen, umlaufenden Geometrie filmelastisch federt. Die Oberfläche dieses Bereich des Dichtungsblechs bildet inso- weit eine radiale Dichtfläche 40.3 shows a variant of a sealing arrangement for a bearing, wherein a carrier plate 30 is pressed into the bore 4 of the bearing outer ring housing 5 (cf., also FIG. The support plate 30 holds a circumferential seal 31, which consists of an elastic rubber material. The seal 31 has a first sealing lip 32 which is formed in already explained in connection with Figure 2 design as a film elastic resilient sealing lip. As already described in detail above, a second sealing lip 33 is pressed onto the surface of a sealing plate 35 by means of a spiral spring 34. The first sealing lip 32 runs on the only indicated surface 36 of the second bearing ring. The surface 36 is formed by the lateral surface of an axial, sleeve-shaped extension (board). The sealing plate 35 is arranged substantially at right angles and pushed with its inner portion on the extension. A radially extending second region 37 of the sealing plate forms a further surface 38, on which a further (third) sealing lip 39 is sealingly supported and due to its kragträgerartigen, circumferential geometry resiliently elastic film. The surface of this region of the sealing plate forms an inso- far a radial sealing surface 40th
Die vorliegende Erfindung wird bevorzugt bei Flugzeugfahrwerken angewendet, weil es hier besonders auf eine zuverlässige, auch unter extremen Be- triebsbedingungen langlebige Dichtung der Fahrwerkslagerungen ankommt. Mit der erfindungsgemäßen Dichtungsanordnung ist ein verbesserter Schutz gegen das Eindringen äußerer Medien (beispielsweise Schmutz oder Wasser) realisiert. Dabei wird auch zuverlässig das Einsaugen von Schmutz und Fremdpartikeln insbesondere infolge der Abkühlung der Lagerung bzw. bei Druckwechseln verhindert. Zudem ist das Lagerungsinnere gegenüber der Umwelt abgedichtet, so dass im Interesse eines verbesserten Umweltschutzes die Gefahr von austretendem Öl oder Fett minimiert ist. The present invention is preferably used in aircraft landing gear, because it depends in particular on a reliable, even under extreme operating conditions durable seal the suspension mounts. With the sealing arrangement according to the invention an improved protection against the penetration of external media (for example, dirt or water) is realized. The suction of dirt and foreign particles is also reliably prevented, in particular as a result of the cooling of the storage or during pressure changes. In addition, the storage interior is sealed from the environment, so that in the interest of improved environmental protection, the risk of leaking oil or fat is minimized.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 erster Lagerring 39 Dichtlippe1 first bearing ring 39 sealing lip
2 zweiter Lagerring 40 Dichtfläche2 second bearing ring 40 sealing surface
3 Träger3 carriers
4 Bohrung4 hole
5 Lageraußenringgehäuse5 bearing outer ring housing
7 Dichtring7 sealing ring
8 Verbindungsbereich8 connection area
9 Dichtlippe9 sealing lip
10 Dichtlippe10 sealing lip
12 Fortsatz12 extension
13 Anschlussbereich13 connection area
14 Gummimaterial14 rubber material
15 Pfeilrichtung15 arrow direction
18 Materialspitze18 material tip
19 Kontakt19 contact
22 Oberfläche22 surface
23 axiale Richtung23 axial direction
24 Fortsatz24 extension
25 Spiralfeder25 spiral spring
26 Innenbereich26 indoor area
27 Außenbereich27 outdoor area
30 Trägerblech30 carrier sheet
31 Dichtung31 seal
32 erste Dichtlippe32 first sealing lip
33 zweite Dichtlippe33 second sealing lip
34 Spiralfeder34 spiral spring
35 Dichtungsblech35 gasket sheet
36 Oberfläche36 surface
37 Bereich37 area
38 Oberfläche 38 surface

Claims

Patentansprüche claims
1. Dichtungsanordnung für ein Lager, das einen ersten Lagerring (1) und einen relativ zu dem ersten Lagerring (1) drehbaren zweiten Lagerring (2) umfasst, wobei im Bereich des ersten Lagerrings (1) eine in Lagerumfangsrich- tung umlaufende Dichtung (7) angeordnet ist, wobei der zweite Lagerring (2) mit einer umlaufenden Dichtfläche (22) versehen ist und wobei die Dichtung (7) zumindest zwei umlaufende Dichtlippen (9, 10) aufweist, die dichtend auf der Dichtfläche (22) aufliegen.1. Sealing arrangement for a bearing which comprises a first bearing ring (1) and a second bearing ring (2) rotatable relative to the first bearing ring (1), wherein in the region of the first bearing ring (1) a seal (7) running around in the bearing circumferential direction ), wherein the second bearing ring (2) is provided with a circumferential sealing surface (22) and wherein the seal (7) has at least two circumferential sealing lips (9, 10) which rest sealingly on the sealing surface (22).
2. Dichtungsanordnung nach Anspruch 1 , wobei zumindest eine Dichtlippe (9) filmelastisch federnd ausgebildet ist.2. Sealing arrangement according to claim 1, wherein at least one sealing lip (9) is formed elastically elastic film.
3. Dichtungsanordnung nach Anspruch 1 oder 2, wobei zumindest eine Dichtlippe (10) volumenelastisch federnd ausgebildet ist.3. Sealing arrangement according to claim 1 or 2, wherein at least one sealing lip (10) is formed volume resiliently resilient.
4. Dichtungsanordnung nach Anspruch 2 oder 3, wobei ein Federelement (25) die Dichtlippe (10) auf die Dichtfläche (22) presst. 4. Sealing arrangement according to claim 2 or 3, wherein a spring element (25) the sealing lip (10) on the sealing surface (22) presses.
5. Dichtungsanordnung nach Anspruch 4, wobei das Federelement (25) eine Spiralfeder ist.5. Sealing arrangement according to claim 4, wherein the spring element (25) is a coil spring.
6. Dichtungsanordnung nach einem der vorangehenden Ansprüche, wo- bei die mindestens zwei Dichtlippen (32, 33) an einem sich axial erstreckenden Abschnitt (36) der Dichtfläche anliegen und wobei die Dichtung (31) eine weitere Dichtlippe (39) aufweist, die an einer sich radial erstreckenden Dichtfläche (40) anliegt.6. Sealing arrangement according to one of the preceding claims, wherein the at least two sealing lips (32, 33) abut an axially extending portion (36) of the sealing surface and wherein the seal (31) has a further sealing lip (39), the a radially extending sealing surface (40) is present.
7. Dichtungsanordnung nach einem der vorangehenden Ansprüche, wobei zumindest ein Teil der Dichtfläche (22) von einem axialen Fortsatz (24) des zweiten Lagerrings (2) gebildet ist.7. Sealing arrangement according to one of the preceding claims, wherein at least part of the sealing surface (22) by an axial extension (24) of the second bearing ring (2) is formed.
8. Dichtungsanordnung nach einem der vorangehenden Ansprüche, wobei zumindest ein Teil der Dichtfläche auf einem Dichtblech (35) ausgebildet ist, das auf einen axialen Fortsatz (36) des zweiten Lagerrings auf- gebracht ist.8. Sealing arrangement according to one of the preceding claims, wherein at least a part of the sealing surface on a sealing plate (35) is formed, which is placed on an axial extension (36) of the second bearing ring.
9. Dichtungsanordnung nach einem der vorangehenden Ansprüche, wobei die umlaufende Dichtung (7) in einer stirnseitigen Aufnahme des ersten Lagerrings (1 ) angeordnet ist. 9. Sealing arrangement according to one of the preceding claims, wherein the circumferential seal (7) in an end-side receptacle of the first bearing ring (1) is arranged.
EP08801239A 2007-09-06 2008-08-27 Sealing arrangement for a bearing Ceased EP2195563A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007042368A DE102007042368A1 (en) 2007-09-06 2007-09-06 Sealing arrangement for a bearing
PCT/DE2008/001431 WO2009030201A1 (en) 2007-09-06 2008-08-27 Sealing arrangement for a bearing

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EP2195563A1 true EP2195563A1 (en) 2010-06-16

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US (1) US8439571B2 (en)
EP (1) EP2195563A1 (en)
JP (1) JP2010538222A (en)
CN (1) CN101970916A (en)
DE (1) DE102007042368A1 (en)
WO (1) WO2009030201A1 (en)

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US20130043683A1 (en) * 2011-08-17 2013-02-21 Vincent Genovese Fluid driven energy conversion apparatus and method
CN102562817A (en) * 2012-02-28 2012-07-11 洛阳轴研科技股份有限公司 Method for designing combined sealing device used in low speed and heavy load conditions of bearing
US10519721B2 (en) 2015-04-27 2019-12-31 Halliburton Energy Services, Inc. Nested bearing and seal for roller cone drill bit
DE102017130630A1 (en) 2017-12-20 2019-06-27 Schaeffler Technologies AG & Co. KG Rolling bearing assembly, especially for bicycle bottom bracket
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Publication number Publication date
JP2010538222A (en) 2010-12-09
US20110188791A1 (en) 2011-08-04
WO2009030201A1 (en) 2009-03-12
CN101970916A (en) 2011-02-09
US8439571B2 (en) 2013-05-14
DE102007042368A1 (en) 2009-03-19

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