EP2588772A1 - Ensemble d'étanchéité - Google Patents

Ensemble d'étanchéité

Info

Publication number
EP2588772A1
EP2588772A1 EP11727458.9A EP11727458A EP2588772A1 EP 2588772 A1 EP2588772 A1 EP 2588772A1 EP 11727458 A EP11727458 A EP 11727458A EP 2588772 A1 EP2588772 A1 EP 2588772A1
Authority
EP
European Patent Office
Prior art keywords
bearing
ring
seal
sealing
elastomer
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.)
Withdrawn
Application number
EP11727458.9A
Other languages
German (de)
English (en)
Inventor
Wilhelm Sebald
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 EP2588772A1 publication Critical patent/EP2588772A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
    • F16C33/7853—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/54—Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement
    • B64C27/58—Transmitting means, e.g. interrelated with initiating means or means acting on blades
    • B64C27/59—Transmitting means, e.g. interrelated with initiating means or means acting on blades mechanical
    • B64C27/605—Transmitting means, e.g. interrelated with initiating means or means acting on blades mechanical including swash plate, spider or cam mechanisms
    • 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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/43—Aeroplanes; Helicopters

Definitions

  • the invention relates to a sealing arrangement, in particular for sealing a thin-ring bearing.
  • the invention is in the field of sealing a thin-film bearing, as may be used to support a swashplate from a helicopter.
  • a swash plate of a helicopter serves to control an angle of attack of a rotor blade. It is usually mounted outside of a rotor mast and consists of a non-rotating inner part and an outer part rotating with rotor blades. These two parts are connected by a rolling bearing, often a thin-ring bearing in design as a double-row angular contact ball bearings.
  • Thin-section bearings are generally known and are distinguished by a cross-sectional height which is small relative to a diameter, for example in a diameter-cross-section height ratio of 10/1 to more than 50/1.
  • Figure 5 and Figure 6 shows a conventional prior art seal for such a swash plate roller bearing.
  • Figure 5 shows a double-row angular contact ball bearing, which is sealed at its two axial sides primarily against the ingress of dirt and moisture by a respective seal ( Figure 6).
  • Such a seal in the form of an axially sealing (one) lip seal with a radial lip, as shown in more detail in FIG.
  • the seal has a disc-shaped support body to which an elastomeric body is vulcanized.
  • the elastomeric body forms the one radial lip.
  • the seal is arranged in a groove on an outer ring of the double-row angular contact ball bearing.
  • the one radial lip of the seal rests with a sliding contact on a sliding contact surface on an inner ring of the double-row angular contact ball bearing.
  • the object of the present invention is to provide a sealing arrangement, the above requirements for an effective seal, especially in Taumelinnschreibnringla- like justice, and structurally simple and inexpensive to produce is.
  • This seal arrangement has at least two, each forming a radial sealing lip elastomeric body. Axially between the at least two elastomer bodies, a support body is arranged.
  • a significant advantage of the invention is that the sealing function is improved in a simple manner - in particular due to the two radial ribs - in rolling bearings, whereby the entry of dirt and / or moisture in a rolling bearing and / or the leakage of lubricant from the rolling bearing reduced becomes.
  • efficiency limitations can be counteracted by temperature-induced expansions and elastic torsions of the parts under load.
  • seals according to the invention can be produced economically and inexpensively by resorting to known technologies, for example elastomeric semi-finished products in sheet form.
  • the at least two elastomeric body are integrally formed. It is also possible for a plurality of elastomer bodies each forming a radial sealing lip and a plurality of supporting bodies to be present, it also being possible here for the plurality of respective elastomer bodies forming a radial lip to be formed in one piece. It can further be provided that in each case a support body is arranged axially between two of the plurality of elastomer bodies.
  • the at least two elastomeric bodies are made of rubber, in particular of nitrile rubber or of fluororubber.
  • the support body has a higher rigidity than the at least two elastomer body.
  • the support body may be made of a material having a higher rigidity than the material of the elastomer body.
  • the support body may consist of a metal or of a duroplastic, in particular with textile and / or glass fiber reinforcement;
  • the elastomeric body may be made of rubber, in particular of nitrile rubber or fluororubber.
  • the at least two elastomeric bodies are connected to one another by gluing and / or vulcanization and / or the at least two elastomeric bodies and the supporting body by gluing and / or vulcanization.
  • Such manufacturing technologies are generally known and can be used in particular in the invention cost.
  • an axial side surface of the sealing arrangement in particular one of the at least two elastomeric body having one or more annular and / or punctiform elevations.
  • the invention for sealing a thin-film bearing in particular a thin-ring bearing for supporting a swash plate of a helicopter, are used.
  • cost-intensive maintenance activities such as relubrication, or maintenance intervals can be reduced or shortened.
  • expensive downtimes / idle times - such as downtime for maintenance - can be reduced.
  • a bearing system in particular a thin-film bearing system, has at least one bearing ring and the seal arrangement according to the invention, wherein the bearing ring has a groove or a recess into which or in which the seal arrangement is inserted, centered and / or held or will.
  • the at least one bearing ring is a static part of the bearing system, wherein the two sealing lips are in sliding contact with a relatively moving part of the bearing system.
  • At least one bearing ring or a seal runner connected to the bearing ring has at least one collar, in particular a conical collar, which is arranged at least partially axially between the at least two elastomer bodies.
  • a shape, in particular a width and / or inclination, of the at least one conical collar can be formed in such a way that a prescribable contact force of the at least one conical collar on the radial sealing lips or the radial lips on the at least one conical Federation achievable.
  • a direction of the seal ie a seal in one or in the axial direction opposite thereto or in both Axial directions - or in any combination, be controlled or adjusted.
  • the bearing ring or a seal rotor connected to the bearing ring has two or more collars, in particular conical collars on one side (similar in cross section to a sawtooth profile), wherein a radial lip of the seal arrangement in each case on a side surface of the two or more Bunde, in particular on a unilaterally inclined side surface of the two or more one-sided conical collars, rests.
  • FIG. 1 shows a section of a sealed, double-row angular contact ball bearing, for example for the storage of a swash plate of a helicopter, according to an embodiment of the invention
  • Figure 2 is an axial-sealing lip seal with two radial ribs for the sealed, double-row angular contact ball bearing according to Figure 1 (or Figure 3).
  • FIG. 3 shows a detail of a sealed, double-row angular contact ball bearing with an axial-sealing lip seal with two radial lips (double seal) according to a further embodiment.
  • Example of the invention
  • Figure 4 shows a detail of a sealed, double-row angular contact ball bearing with an axially-sealing lip seal with three radial ribs (Dreilippendichtung) according to another embodiment of the invention
  • Figure 5 shows a detail of a sealed, double-row angular contact ball bearing for supporting a swash plate of a helicopter according to the prior art
  • FIG. 6 shows an axial-sealing (one-way) lip seal with a radial lip for the sealed, double-row angular contact ball bearing according to FIG. 5.
  • Exemplary embodiment 1 double-sided sealed, double-row angular contact ball bearing with double seal
  • Figure 1 shows a section of a sealed double-sided angular contact ball bearing 1, as it is used for the storage of a swash plate of a helicopter.
  • double-row angular contact ball bearings 1 has an outer ring 3, a split inner ring 2 and two rows of rolling elements 4 and balls 4, which are each arranged between raceways 8 on the outer ring 3 and the split inner ring 2.
  • the rolling elements 4 of the two rows are each held by a cage 5.
  • the outer ring 3 of this angular contact ball bearing 1 on a lubrication hole 6.
  • an axially-sealing lip seal 10 with two radial ribs 13 (double seal) is arranged in an area at both axial ends of this angular contact ball bearing 1.
  • Figure 2 shows this double seal 10 in more detail.
  • this double seal 10 has a support body 1 1, which is made of a metal or a thermoset with textile or glass fiber reinforcement.
  • the support body 1 1 is enclosed on both axial sides 14 and a radial (bottom) side 15 of an elastomer 12, wherein elastomer 12 and support body 1 1 are connected to each other by vulcanization.
  • the Elastomer 12 consists of a synthetic nitrile rubber (NBR) or a Flourkautschuk (FKM) and thus has a lower stiffness than the support body 1 1.
  • the elastomer 12 forms two radial extensions 13, i. the two radial lips 13, from.
  • the elastomer 12 is - as Figure 2 shows - integrally formed here, but also two interconnected part elastomers, which could form each partial elastomer one of the two radial ribs 13, is conceivable.
  • Other divisions of the elastomer e12 in arbitrarily shaped partial elastomer body are conceivable.
  • a combination of partial elastomers to the total body 12 and the elastomer 12 can also be effected by vulcanization and by gluing.
  • the elastomer 12 on one (axial) side 14 on two annular projections which increase an axial elasticity of the double seal 10 and thus facilitate installation of the double seal 10 in the angular contact ball bearing 1 and a seat of the double seal 10 in reinforce a seal holder 7.
  • the two double seals 10 are each arranged in the axial end region of the angular contact ball bearing 1.
  • the outer ring 3 of the angular contact ball bearing 1 ie in this case the static part of the angular contact ball bearing 1, in both axial end regions in each case a groove 7 (gasket receptacle). In these grooves 7, the two double seals 10 are centered and - improved by the annular elevation 18 - held.
  • the inner ring 2 of the angular contact ball bearing 1 has in the region of its axial ends in each case a radially outward, i. in the direction of the outer ring 3, directed conical board or collar 16.
  • the two - approximately symmetrical in the radial direction converging - axial side surfaces of the conical collar 16 form sliding contact surfaces 17, against which the two radial ribs 13 of the double seal 10 in sliding contact.
  • the inclination or the inclination angle, the direction of the inclination and the diameter determines the contact pressure of the seal 10, which can be selected, for example, according to the application, and the (axial) direction of the sealing effect.
  • FIG. 3 shows a detail of a double-row angular contact ball bearing 1 with double seal 10 sealed on both sides, similar to that according to FIG. 1 and FIG. 2 (exemplary embodiment 1) but with a somewhat modified sealing effect.
  • the double seal 10 itself is identical to that of FIG. 2 and FIG.
  • the angular contact ball bearing 1 according to FIG. 3 has a modified inner ring 2.
  • This changed inner ring 2 of the angular contact ball bearing 1 has in the region of its axial ends in each case two radially outwardly, i. in the direction of the outer ring 3, directed, unilaterally inclined conical collars or ribs 16. Only one axial side surface of these two unilateral, conical bundles 16 - in this case, the side surface of the unilaterally inclined, conical collar 16, which is inclined - forms the sliding contact surface 17, to which one of the two radial lips 13 of the double seal 10 bears in sliding contact.
  • Figure 3 carried by the abutment of the two radial ribs 13 respectively at the corresponding (inclined) axial side surface of the two collars 16 an enhanced sealing effect in an axial direction.
  • a sealing effect against the ingress of contamination in the angular contact ball bearing 1 is reinforced here.
  • FIG. 4 shows a section of another double-sided angular contact ball bearing 1 sealed on both sides. This too is similar to that according to FIGS. 1 and 2 (exemplary embodiment 1) or FIG. 3 (exemplary embodiment 2). forms.
  • Deviations from described angular contact ball bearings 1 according to FIGS. 1 to 3 are in the embodiment according to FIG. 4 in the manner of the seal, i. Dreilippendichtung 10 according to Figure 4, and a further - according to or the Dreilippendichtung 10 adapted - changed inner ring 2 of the angular contact ball bearing first
  • This further changed inner ring 2 of the angular contact ball bearing 1 has in the region of its axial ends in each case two radially outwards, i. in the direction of the outer ring 3, directed conical collars 13.
  • the first, axially further outward collar 13 of the two collars 13 has a one-sided inclined cone shape, whereas the second axially further inwardly located collar 13 of the two collars 13 has a tapered conical shape on both sides ,
  • this three-lip seal 10 has two support body 1 1, which are each also made of a metal or a thermoset with textile or glass fiber reinforcement. Both support bodies 1 1 are each enclosed on both axial sides 14 and the radial (bottom) side 15 of an elastomer 12, wherein the elastomer 12 and the support body 1 1 are connected to each other by vulcanization.
  • the elastomer 12 is also made of a synthetic nitrile rubber (NBR) or a Flourkautschuk (FKM) and thus has a lower stiffness than the support body 1 1.
  • the elastomer 12 forms three radial extensions 13, ie, the three radial lips 13 of the three-lip seal 10, from.
  • the elastomer 12 is - as Figure 4 shows - also integrally formed here, although here also a plurality of interconnected part elastomers, which could form each partial elastomer one of the three radial ribs 13, is conceivable.
  • a compound of partial elastomers to the total body 12 and Kurs Elastomer 12 may also be made by vulcanization as well as by gluing.
  • the elastomer 12 also on one (axial) side 14, two annular projections 18, which increase the axial elasticity of the double seal 10 and thus facilitate installation of the three-lip seal 10 in the angular contact ball bearing 1 and a seat of the three-lip seal 10 in the groove 7 reinforce.
  • the respective inclined side surfaces of the two conical collars 16 form the sliding contact surfaces 17, against which the three radial ribs 13 of the three-lip seal 10 in sliding contact.
  • a radial lip 13 of the three-lip seal 10 bears against the "only" one inclined axial side of the first collar 16, the other two radial lips 13 of the three-lip seal 10 lie against the two inclined axial side faces of the second collar 16 Again, a sealing effect against the ingress of contamination in the angular contact ball bearing 1 - at the same time high sealing effect against leakage of the lubricant - reinforced.

Landscapes

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

Abstract

L'invention concerne un ensemble d'étanchéité, en particulier pour étancher un palier à bagues minces. Plus spécialement, l'invention concerne l'étanchement d'un palier à bagues minces tel qu'utilisé pour le montage d'un plateau oscillant d'un hélicoptère. Selon l'invention, cet ensemble d'étanchéité comporte au moins deux corps élastomères formant chacun une lèvre d'étanchéité radiale. Un corps de support est disposé axialement entre les deux corps élastomères.
EP11727458.9A 2010-07-01 2011-06-27 Ensemble d'étanchéité Withdrawn EP2588772A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010025803.2A DE102010025803B4 (de) 2010-07-01 2010-07-01 Dichtungsanordnung
PCT/EP2011/060669 WO2012000913A1 (fr) 2010-07-01 2011-06-27 Ensemble d'étanchéité

Publications (1)

Publication Number Publication Date
EP2588772A1 true EP2588772A1 (fr) 2013-05-08

Family

ID=44584776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11727458.9A Withdrawn EP2588772A1 (fr) 2010-07-01 2011-06-27 Ensemble d'étanchéité

Country Status (4)

Country Link
US (1) US20130101242A1 (fr)
EP (1) EP2588772A1 (fr)
DE (1) DE102010025803B4 (fr)
WO (1) WO2012000913A1 (fr)

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Publication number Priority date Publication date Assignee Title
US9506554B2 (en) * 2011-03-22 2016-11-29 Ntn Corporation Rolling bearing and a travel unit including rolling bearings
JP6227250B2 (ja) 2013-01-10 2017-11-08 Ntn株式会社 軸受シールおよびシール付き転がり軸受
JP5750539B1 (ja) * 2014-10-08 2015-07-22 土肥研磨工業株式会社 シール付きベアリング
DE202016106250U1 (de) 2016-11-09 2016-11-22 WP Systems GmbH Dichtungsanordnung
CN106838017B (zh) * 2017-04-10 2022-10-04 无锡市海峰海林精密轴承有限公司 一种汽车发动机用防漏脂轴承密封结构
CN114198395B (zh) * 2021-12-09 2023-05-23 珠海格力电器股份有限公司 轴承结构以及具有其的电机

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US2310607A (en) * 1941-06-11 1943-02-09 Norma Hoffmann Bearing Corp Rubber bonded split metal washer seal
US2764432A (en) * 1952-06-04 1956-09-25 Fafnir Bearing Co Bearing seal
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FR1178954A (fr) * 1957-07-16 1959-05-19 Moteurs Baudouin Soc D Système d'étanchéité au passage d'un arbre au travers d'une cloison
US2983529A (en) * 1958-04-10 1961-05-09 Link Belt Co Bearing seals
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DE19811686A1 (de) * 1998-03-18 1999-09-23 Leibe Klaus Nabenfreies Laufrad für Fahrzeuge zur Personenbeförderung, insbesondere für Rollstühle
FR2778954B1 (fr) * 1998-05-20 2000-06-23 Rks Sa Agencement d'etancheite pour un roulement
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Also Published As

Publication number Publication date
DE102010025803B4 (de) 2016-05-19
US20130101242A1 (en) 2013-04-25
DE102010025803A1 (de) 2012-01-05
WO2012000913A1 (fr) 2012-01-05

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