WO2010133240A1 - Sealing device for rolling contact bearings - Google Patents

Sealing device for rolling contact bearings Download PDF

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Publication number
WO2010133240A1
WO2010133240A1 PCT/EP2009/003594 EP2009003594W WO2010133240A1 WO 2010133240 A1 WO2010133240 A1 WO 2010133240A1 EP 2009003594 W EP2009003594 W EP 2009003594W WO 2010133240 A1 WO2010133240 A1 WO 2010133240A1
Authority
WO
WIPO (PCT)
Prior art keywords
shield
sealing
sealing device
fact
covering
Prior art date
Application number
PCT/EP2009/003594
Other languages
French (fr)
Inventor
Daniele Duch
Joel Gerbaud
Régis Petit
Thomas Perrotin
Original Assignee
Aktiebolaget Skf
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 Aktiebolaget Skf filed Critical Aktiebolaget Skf
Priority to PCT/EP2009/003594 priority Critical patent/WO2010133240A1/en
Priority to DE112009004785T priority patent/DE112009004785T5/en
Publication of WO2010133240A1 publication Critical patent/WO2010133240A1/en

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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
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/3456—Pressing means without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip
    • 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
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • F16C33/7859—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 further sealing element
    • F16C33/7863—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 further sealing element mounted to the inner race, e.g. a flinger to use centrifugal effect
    • 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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
    • 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
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a 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
    • F16C33/72—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
    • F16C33/7896—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members with two or more discrete sealings arranged in series

Definitions

  • the present invention refers to a sealing device for rolling contact bearings.
  • the European Patent Application No. 02025910.7 describes a sealing device for rolling contact bearings which comprises an outer ring, an inner ring which is co-axial to the outer ring, and a series of rolling bodies arranged between the two rings, the sealing device preventing any impurities or suchlike from entering inside the rolling contact bearing itself and comprising a sealing covering which is arranged between the two rings.
  • the covering is arranged laterally to the rolling bodies and to an annular flat shield which is coupled to the inner ring, such that an annular gap of constant axial thickness is defined between the sealing covering and the flat shield.
  • the effect of the flat shield is to increase the sealing capacity of the sealing device.
  • the sealing device described above is inexpensive to produce and is easy to assemble on a bearing. In some applications, however, the sealing capacity of this sealing device is particularly challenged when large amounts of contaminants such as dust and mud are present .
  • a sealing device for a rolling contact bearing comprising a sealing covering which is arranged between two rings of the rolling contact bearing and comprising an annular shield coupled to a first ring of the two bearing rings.
  • the sealing covering is arranged laterally to rolling bodies of the rolling contact bearing and to the annular shield, such that an annular gap is defined between opposing surfaces of the sealing device and the annular shield.
  • the sealing device comprises at least one sealing lip that extends from the sealing covering in an axially outward direction and makes contact with the annular shield, thereby creating a sealed chamber between the sealing covering and the shield.
  • FIGURE 1 illustrates, in transverse section, part of a first embodiment of the sealing device for rolling contact bearing to which the present invention refers;
  • FIGURE 2 illustrates, in transverse section, part of a second embodiment of the sealing device according to the invention
  • FIGURE 3 illustrates, in transverse section, part of a third embodiment of the sealing device according to the invention
  • FIGURE 4 illustrates, in transverse section, part of a fourth embodiment of the sealing device according to the invention
  • FIGURE 5 illustrates, in transverse section, part of a fifth embodiment of the sealing device according to the invention
  • FIGURES 6-9 illustrate different further embodiments of a rolling contact bearing equipped with a sealing device according to the invention.
  • reference numeral 1 indicaLca a. rolling contact bearing in its entirety, presenting a rotation axis X and comprising an outer ring 2, an inner ring 3 which is co-axial to the outer ring 2, and a series of rolling bodies 4 which are arranged between the two rings 2 and 3.
  • the outer ring 2 and the inner ring 3 are respectively- provided with a raceway 6a and 6b for the rolling bodies 4 and with an annular groove 7a and 7b which is arranged laterally to the respective raceway 6a, 6b.
  • the annular groove 7a on the outer ring 2 has an axially inward position relative to an outer lateral surface 2s of the outer ring 2 and the annular groove 7b on the inner ring 3 has an axially inward position relative to an outer lateral surface 3s of the inner ring 3.
  • sealing device i ⁇ u is arranged between the two rings 2 and 3 and comprises: a sealing covering 20 which is arranged between the outer ring 2 and an inner ring 3 and which is arranged laterally to the rolling bodies 4; and
  • annular shield 40 which is coupled to the inner ring 3 and which is arranged laterally to the sealing covering 20 in order to define an annular gap G with the sealing covering 20.
  • Both the sealing covering 20 and the shield 40 are arranged transverse to the axis X, and the former is angularly integral with the outer ring 2, which, in use, is a stationary ring; whereas the latter is angularly integral with the inner ring 3, which, in use, is a rotating ring.
  • the outer ring 2 may be the rotary ring and the inner ring 3 may be the stationary ring, so the sealing covering 20 may be integral with the inner ring 3, and the shield 40 may be integral with the outer ring 2.
  • the shield 40 extends in a radially outward direction and has an axially inner surface that faces towards an opposing axially outer surface of the sealing covering 20, to define the gap G whose dimenaiuiia should prevent the entry of contaminants and pollution inside the rolling contact bearing 1.
  • the shield 40 comprises a flat intermediate portion 45 which is arranged in direct contact with the lateral surface 3s of the inner ring 3.
  • the shield 40 may be made of stainless steel, or of aluminium, or of plastic, or of brass, or of a coated steel sheet. The material of shield may be suitably selected to provide corrosion protection to the inner ring 3.
  • the shield 40 is flat for most of its radial length and especially along its flat intermediate portion 45. At its radial periphery, the shield 40 is advantageously provided with a shaped edge 41, which is outwardly concave and inwardly convex, and defines with the sealing covering 20 an entrance Gl of the annular gap G.
  • the edge 41 has in a transverse section an arched shape and its outwardly concave shape allows it to eject contaminants by means of a centrifugal effect due to its rotation around axis X.
  • the inwardly convex shape of the edge 41 tapers the entrance Gl and reduces the opening of entrance Gl, in order to prevent contaminants from entering the rolling contact bearing 1.
  • the flat portion 45 is placed almost on the same axial plane of the lateral surfaces 2s and 3s of the bearing rings 2 and 3: so the shaped edge 41 crosses this axial plane and extends in between rings
  • the shield 40 comprises an assembly portion 42 which is radially opposed to the shaped edge 41 with respect to the flat intermediate portion 45 and is arranged inside a recessed annular housing 43 made along an edge of the inner ring 3, in order to prevent the dismounting of the shield 40 from the inner ring 3.
  • the housing 43 is delimited in a radially outward direction by a surface 43a which is cylindrical, and is delimited in an axially inward direction by a shoulder 44.
  • the assembly portion 42 is defined by a cylindrical element which is mounted with an interference fit in the housing 43 in order to fix the shield 40 to the inner ring 3.
  • the assembly portion 42 is defined by a cylindrical element which is arranged in the housing 43, but which is not in direct contact with the cylindrical surface 43 ⁇ eta previously described.
  • An 0-ring 46 is interposed between the assembly portion 42 and the cylindrical surface 43a.
  • the 0-ring 46 is made of rubber and elastic material and is useful not only to improve the sealing between the assembly portion 42 and the inner ring 3, but also to overcome alignment problems of the assembly portion 42 itself.
  • the assembly portion 42 is defined by a conical element which is arranged in the housing 43 and which is tapered towards the cylindrical surface 43a of the housing.
  • the conical element is a flexible element and can be snapped into the housing 43.
  • the assembly portion 42 is defined by a welded or glued portion which is arranged in contact with the cylindrical surface 43a.
  • the surface 43a coincides with an inner cylindrical surface of the inner ring 3.
  • the shield 40 is always mounted to the cylindrical surface 43a of the inner ring 3 in order to simplify the assembly operation of the shield 40 with the inner ring 3.
  • the sealing covering 20 is provided with a rigid core member 30 made of metal or the like and with an elastic member 22 made of rubber, synthetic resin or the like, which partially covers the core member 30.
  • the core member 30 comprises a first portion 31 and a second portion 32.
  • the first portion is outwardly convex and is provided with an inwardly bent extremity 33.
  • the second portion 32 which is lies radially inward of the first portion 31, is essentially flat and is joined to the first portion 31 by means of an intermediate conical portion 34.
  • the elastic member 22 covers an axially outer surface 21s of the core member 30 and comprises a radially outer annular edge 23 and a radially inner distal end 24.
  • the outer edge 23 is press-fitted in the groove 7a of the outer ring 2 and the distal end 24 is in contact with the inner ring 3, in the inner ring groove 7b which is axially delimited by a wall surface 7s.
  • the outer edge 23 of the elastic member 22 is T-shaped and on one side is reinforced by the extrarr.ity 33 of the uure member J(J, whereas on the other side it is provided with a tapered free lip 26 which is suitable to be elastically deformed when the outer edge 23 is snap- fitted inside the groove 7a of the outer ring 2.
  • the distal end 24 of the elastic member 22 is provided with first, second and third lips 24a, 24b and 24c, which are concentric with each other and which extend in an axially inward direction towards the wall surface 7s.
  • the second and third lips 24b and 24c bear against the wall surface 7s of the inner ring groove 7b.
  • the first lip 24a has a larger diameter than the second and third lips 24b and 24c, and extends axially inward of the wall surface 7s, over an outer diameter surface 3a of the inner ring 3.
  • the first lip 24a has a radially inner cylindrical surface 24s which forms a labyrinth with the outer diameter surface 3a of the inner ring 3.
  • the first lip 24a is in direct contact with the second portion 32 of the core member 30 and is linked to the other two lips 24b and 24c by means of a bridge element 24e.
  • the bridge element 24e extends from the second portion 32 of the core member 30 towards the periphery of the distal end 24 of the elastic member 22, and has an axial thickness smaller that an axial thickness of che first and second lips 24b and 24c in order to ensure that the lips 24b and 24c make proper sliding contact against the wall surface 7s of the inner ring groove.
  • the elastic member 22 further comprises a protruding section 25 which is formed on the axially outer surface 21s of the first portion 31 of the core member 30.
  • the protruding section 25 is not limited to the shape shown in figure 1, and can be changed arbitrarily within the scope of the invention.
  • the shape is not limited to a trapezoidal cross-sectional shape but a desired alternative cross-sectional shape could be selected.
  • the trapezoidal cross- sectional shape is particularly advantageous as the protruding section 25 is radially delimited towards the axis X by a conical surface 25s which faces the shaped edge 41 of the shield 40 and defines the entrance Gl in order to taper the entrance Gl towards the gap G and in order to increase the centrifugal effect of the shaped edge 41.
  • the narrow entrance Gl due to the mutual shape of the edge 41 and of the surface 25s prevents water or dirt from reaching the distal end 24 of the sealing covering 20, to secure and improve the seal performance .
  • the ccr.ic ⁇ l surface 25a further identifies a layer 28, which is part of the elastic member 22 and which covers the conical portion 34 and the flat second portion 32 of the core member 30 up to the distal end 24 of the elastic member 22.
  • the elastic member 22 further comprises an axially outer sealing lip 128 which contacts the axially inner surface of the shield 40 to create a sealed chamber 29 between the sealing covering 20 and the shield 40.
  • the axially outer sealing lip 128 is formed on the axially outer surface 21s of the flat second portion 32, and extends therefrom in an axially outward direction towards the axis of rotation X.
  • the sealed chamber 29 defines a tank for grease between the shield 40 and the sealing covering 20, which provides a lubricant for the aforementioned sliding contact and also acts as a further barrier so as to definitively prevent the ingress of contaminants and pollution.
  • the axially outer sealing lip 128 is shown in its original shape, not deformed by the contact with the shield 40, but due to the unique position of the scaling coveiing zo and due to the unique position also of the shield 40 as above described, the annular gap G has a well defined axial dimension and the deformation of the sealing lip 128 can be optimized to increase of the overall performance of the sealing device 110.
  • the sealing device 210 likewise comprises a sealing covering 20 with axially outer sealing lip 228 that bears against an axially inner surface of the shield 40.
  • the sealing lip 228 extends axially to the shield 40 in a direction away from the axis of rotation.
  • FIG 3 A further embodiment of a sealing device according to the invention is illustrated in figure 3.
  • the sealing device 310 shown in this embodiment comprises two axially outer sealing lips 328 of the kind shown in figure 2. Both sealing lips 328 bear against an axially inner surface of the shield 40 and are arranged essentially parallel to each other. In other words, each sealing lip 328 extends in a direction towards the shield 40 and away from the axis of rotation X, whereby an additional sealed chamber 329 is formed between the two axially outer sealing lips.
  • FIG 4. A further embodiment of a sealing device according to the invention is illustrated in figure 4.
  • the sealing device 410 shown in this embodiment comprises two axially outer sealing lips 428 of the kind shown in figure 1. Both sealing lips 428 bear against an axially inner surface of the shield 40 and are arranged essentially parallel to each other. In other words, each sealing lip 428 extends in a direction towards the shield 40 and towards the axis of rotation X, whereby an additional sealed chamber 429 is formed between the two axially outer sealing lips
  • a still further embodiment of a sealing device according to the invention is illustrated in figure 5.
  • the sealing device 510 shown in this embodiment comprises a first axially outer sealing lip 528a of the kind shown in figure 2 and comprises a second axially outer sealing lip 528b of the kind shown in figure 1.
  • Both sealing lips 528a and 528b bear against an axially inner surface of the shield 40, but in this embodiment the lips extend to the shield in opposite directions; i.e. the first axially outer lip 528a extends to the shield in a direction away from the axis of rotation X and the second axially outer lip ⁇ 2Sb extends Luwards the shield in a direction towards the axis of rotation X.
  • an additional sealed chamber 529 is formed between the first and second axially outer sealing lips 528a and 528b.
  • the different embodiments of the sealing device described allow different sealing actions without requiring different assembly processes.

Abstract

Sealing device (110) for a rolling contact bearing (1), the sealing device (110) being provided with a sealing covering (20) which is arranged between an outer and an inner ring of the rolling contact bearing (1) and being further provided with an annular shield (40) which is coupled to the inner ring. The shield (40) is arranged laterally to the sealing covering (20) so as to define an annular gap (G) there between. According to the invention, the sealing device comprises at least one sealing lip (128) that extends from sealing covering (20) to bear against the shield (40), to create a sealed chamber (29) between the sealing covering (20) and the shield (40).

Description

SEALING DEVICE FOR ROLLING CONTACT BEARINGS
TECHNICAL FIELD
The present invention refers to a sealing device for rolling contact bearings.
BACKGROUND
The European Patent Application No. 02025910.7 describes a sealing device for rolling contact bearings which comprises an outer ring, an inner ring which is co-axial to the outer ring, and a series of rolling bodies arranged between the two rings, the sealing device preventing any impurities or suchlike from entering inside the rolling contact bearing itself and comprising a sealing covering which is arranged between the two rings. The covering is arranged laterally to the rolling bodies and to an annular flat shield which is coupled to the inner ring, such that an annular gap of constant axial thickness is defined between the sealing covering and the flat shield. The effect of the flat shield is to increase the sealing capacity of the sealing device.
The sealing device described above is inexpensive to produce and is easy to assemble on a bearing. In some applications, however, the sealing capacity of this sealing device is particularly challenged when large amounts of contaminants such as dust and mud are present .
SUMMARY
It is a general object of the present invention to provide a sealing device for rolling contact bearings that enables a further improvement in sealing capacity, without leading to an increase in assembly and production costs.
According to the present invention, a sealing device for a rolling contact bearing will be produced comprising a sealing covering which is arranged between two rings of the rolling contact bearing and comprising an annular shield coupled to a first ring of the two bearing rings. The sealing covering is arranged laterally to rolling bodies of the rolling contact bearing and to the annular shield, such that an annular gap is defined between opposing surfaces of the sealing device and the annular shield. According to the invention, the sealing device comprises at least one sealing lip that extends from the sealing covering in an axially outward direction and makes contact with the annular shield, thereby creating a sealed chamber between the sealing covering and the shield.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings .
The present invention will now be described with Lclcience to the attached drawings, which illustrate several non-limiting embodiments of the present invention, and in which; - FIGURE 1 illustrates, in transverse section, part of a first embodiment of the sealing device for rolling contact bearing to which the present invention refers;
- FIGURE 2 illustrates, in transverse section, part of a second embodiment of the sealing device according to the invention;
- FIGURE 3 illustrates, in transverse section, part of a third embodiment of the sealing device according to the invention; - FIGURE 4 illustrates, in transverse section, part of a fourth embodiment of the sealing device according to the invention;
- FIGURE 5 illustrates, in transverse section, part of a fifth embodiment of the sealing device according to the invention; and FIGURES 6-9 illustrate different further embodiments of a rolling contact bearing equipped with a sealing device according to the invention.
DETAILED DESCRIPTION
With reference to figure 1, reference numeral 1 indicaLca a. rolling contact bearing in its entirety, presenting a rotation axis X and comprising an outer ring 2, an inner ring 3 which is co-axial to the outer ring 2, and a series of rolling bodies 4 which are arranged between the two rings 2 and 3. The outer ring 2 and the inner ring 3 are respectively- provided with a raceway 6a and 6b for the rolling bodies 4 and with an annular groove 7a and 7b which is arranged laterally to the respective raceway 6a, 6b. The annular groove 7a on the outer ring 2 has an axially inward position relative to an outer lateral surface 2s of the outer ring 2 and the annular groove 7b on the inner ring 3 has an axially inward position relative to an outer lateral surface 3s of the inner ring 3.
Axially inward refers to a direction towards the rolling bodies 4 of the bearing, while axially outward refers to a direction away from the rolling bodies 4. Similarly, radially inward is to be understood as referring to a direction towards the bearing axis of rotation X, while radially outward refers to a direction away from the axis of rotation X. In order to prevent any contaminants or suchlike from entering inside the rolling contact -, sealing device i±u is arranged between the two rings 2 and 3 and comprises: a sealing covering 20 which is arranged between the outer ring 2 and an inner ring 3 and which is arranged laterally to the rolling bodies 4; and
- an annular shield 40 which is coupled to the inner ring 3 and which is arranged laterally to the sealing covering 20 in order to define an annular gap G with the sealing covering 20.
Both the sealing covering 20 and the shield 40 are arranged transverse to the axis X, and the former is angularly integral with the outer ring 2, which, in use, is a stationary ring; whereas the latter is angularly integral with the inner ring 3, which, in use, is a rotating ring. In a not shown embodiment of the above mentioned sealing device 110, the outer ring 2 may be the rotary ring and the inner ring 3 may be the stationary ring, so the sealing covering 20 may be integral with the inner ring 3, and the shield 40 may be integral with the outer ring 2.
The shield 40 extends in a radially outward direction and has an axially inner surface that faces towards an opposing axially outer surface of the sealing covering 20, to define the gap G whose dimenaiuiia should prevent the entry of contaminants and pollution inside the rolling contact bearing 1. The shield 40 comprises a flat intermediate portion 45 which is arranged in direct contact with the lateral surface 3s of the inner ring 3. The shield 40 may be made of stainless steel, or of aluminium, or of plastic, or of brass, or of a coated steel sheet. The material of shield may be suitably selected to provide corrosion protection to the inner ring 3.
The shield 40 is flat for most of its radial length and especially along its flat intermediate portion 45. At its radial periphery, the shield 40 is advantageously provided with a shaped edge 41, which is outwardly concave and inwardly convex, and defines with the sealing covering 20 an entrance Gl of the annular gap G. The edge 41 has in a transverse section an arched shape and its outwardly concave shape allows it to eject contaminants by means of a centrifugal effect due to its rotation around axis X.
Furthermore, the inwardly convex shape of the edge 41 tapers the entrance Gl and reduces the opening of entrance Gl, in order to prevent contaminants from entering the rolling contact bearing 1.
The flat portion 45 is placed almost on the same axial plane of the lateral surfaces 2s and 3s of the bearing rings 2 and 3: so the shaped edge 41 crosses this axial plane and extends in between rings
2 and 3.
As better shown in figure 6, the shield 40 comprises an assembly portion 42 which is radially opposed to the shaped edge 41 with respect to the flat intermediate portion 45 and is arranged inside a recessed annular housing 43 made along an edge of the inner ring 3, in order to prevent the dismounting of the shield 40 from the inner ring 3. The housing 43 is delimited in a radially outward direction by a surface 43a which is cylindrical, and is delimited in an axially inward direction by a shoulder 44.
In the example of figure 6, the assembly portion 42 is defined by a cylindrical element which is mounted with an interference fit in the housing 43 in order to fix the shield 40 to the inner ring 3.
In an alternative example as shown in figure 7, the assembly portion 42 is defined by a cylindrical element which is arranged in the housing 43, but which is not in direct contact with the cylindrical surface 43α eta previously described. An 0-ring 46 is interposed between the assembly portion 42 and the cylindrical surface 43a. The 0-ring 46 is made of rubber and elastic material and is useful not only to improve the sealing between the assembly portion 42 and the inner ring 3, but also to overcome alignment problems of the assembly portion 42 itself.
In a further alternative example as shown in figure 8, the assembly portion 42 is defined by a conical element which is arranged in the housing 43 and which is tapered towards the cylindrical surface 43a of the housing. The conical element is a flexible element and can be snapped into the housing 43.
In a still further alternative example as shown in figure 9, the assembly portion 42 is defined by a welded or glued portion which is arranged in contact with the cylindrical surface 43a. In this example, the surface 43a coincides with an inner cylindrical surface of the inner ring 3.
In the alternative examples described above, the shield 40 is always mounted to the cylindrical surface 43a of the inner ring 3 in order to simplify the assembly operation of the shield 40 with the inner ring 3. with reference again to figure 1, the sealing covering 20 is provided with a rigid core member 30 made of metal or the like and with an elastic member 22 made of rubber, synthetic resin or the like, which partially covers the core member 30.
More particularly, the core member 30 comprises a first portion 31 and a second portion 32. The first portion is outwardly convex and is provided with an inwardly bent extremity 33. The second portion 32, which is lies radially inward of the first portion 31, is essentially flat and is joined to the first portion 31 by means of an intermediate conical portion 34. The elastic member 22 covers an axially outer surface 21s of the core member 30 and comprises a radially outer annular edge 23 and a radially inner distal end 24. The outer edge 23 is press-fitted in the groove 7a of the outer ring 2 and the distal end 24 is in contact with the inner ring 3, in the inner ring groove 7b which is axially delimited by a wall surface 7s. In this way the axial position of the sealing covering 20 is uniquely defined without any possible misalignment. The outer edge 23 of the elastic member 22 is T-shaped and on one side is reinforced by the extrarr.ity 33 of the uure member J(J, whereas on the other side it is provided with a tapered free lip 26 which is suitable to be elastically deformed when the outer edge 23 is snap- fitted inside the groove 7a of the outer ring 2.
The distal end 24 of the elastic member 22 is provided with first, second and third lips 24a, 24b and 24c, which are concentric with each other and which extend in an axially inward direction towards the wall surface 7s. The second and third lips 24b and 24c bear against the wall surface 7s of the inner ring groove 7b. The first lip 24a has a larger diameter than the second and third lips 24b and 24c, and extends axially inward of the wall surface 7s, over an outer diameter surface 3a of the inner ring 3. Thus, the first lip 24a has a radially inner cylindrical surface 24s which forms a labyrinth with the outer diameter surface 3a of the inner ring 3. The first lip 24a is in direct contact with the second portion 32 of the core member 30 and is linked to the other two lips 24b and 24c by means of a bridge element 24e. The bridge element 24e extends from the second portion 32 of the core member 30 towards the periphery of the distal end 24 of the elastic member 22, and has an axial thickness smaller that an axial thickness of che first and second lips 24b and 24c in order to ensure that the lips 24b and 24c make proper sliding contact against the wall surface 7s of the inner ring groove.
The elastic member 22 further comprises a protruding section 25 which is formed on the axially outer surface 21s of the first portion 31 of the core member 30. The protruding section 25 is not limited to the shape shown in figure 1, and can be changed arbitrarily within the scope of the invention. For example, the shape is not limited to a trapezoidal cross-sectional shape but a desired alternative cross-sectional shape could be selected. In the embodiment shown in figure 1, the trapezoidal cross- sectional shape is particularly advantageous as the protruding section 25 is radially delimited towards the axis X by a conical surface 25s which faces the shaped edge 41 of the shield 40 and defines the entrance Gl in order to taper the entrance Gl towards the gap G and in order to increase the centrifugal effect of the shaped edge 41. The narrow entrance Gl due to the mutual shape of the edge 41 and of the surface 25s prevents water or dirt from reaching the distal end 24 of the sealing covering 20, to secure and improve the seal performance .
The ccr.icαl surface 25a further identifies a layer 28, which is part of the elastic member 22 and which covers the conical portion 34 and the flat second portion 32 of the core member 30 up to the distal end 24 of the elastic member 22. Along the layer 28 which covers the flat second portion 32, the elastic member 22 further comprises an axially outer sealing lip 128 which contacts the axially inner surface of the shield 40 to create a sealed chamber 29 between the sealing covering 20 and the shield 40.
The axially outer sealing lip 128 is formed on the axially outer surface 21s of the flat second portion 32, and extends therefrom in an axially outward direction towards the axis of rotation X. Thus, during operation of the bearing, the axially outer lip 128 is in sliding contact with the shield 40. The sealed chamber 29 defines a tank for grease between the shield 40 and the sealing covering 20, which provides a lubricant for the aforementioned sliding contact and also acts as a further barrier so as to definitively prevent the ingress of contaminants and pollution.
In figure 1, the axially outer sealing lip 128 is shown in its original shape, not deformed by the contact with the shield 40, but due to the unique position of the scaling coveiing zo and due to the unique position also of the shield 40 as above described, the annular gap G has a well defined axial dimension and the deformation of the sealing lip 128 can be optimized to increase of the overall performance of the sealing device 110.
A further embodiment of a sealing device according to the invention is shown in figure 2. The sealing device 210 likewise comprises a sealing covering 20 with axially outer sealing lip 228 that bears against an axially inner surface of the shield 40. In this embodiment, the sealing lip 228 extends axially to the shield 40 in a direction away from the axis of rotation.
A further embodiment of a sealing device according to the invention is illustrated in figure 3. The sealing device 310 shown in this embodiment comprises two axially outer sealing lips 328 of the kind shown in figure 2. Both sealing lips 328 bear against an axially inner surface of the shield 40 and are arranged essentially parallel to each other. In other words, each sealing lip 328 extends in a direction towards the shield 40 and away from the axis of rotation X, whereby an additional sealed chamber 329 is formed between the two axially outer sealing lips.
A further embodiment of a sealing device according to the invention is illustrated in figure 4. The sealing device 410 shown in this embodiment comprises two axially outer sealing lips 428 of the kind shown in figure 1. Both sealing lips 428 bear against an axially inner surface of the shield 40 and are arranged essentially parallel to each other. In other words, each sealing lip 428 extends in a direction towards the shield 40 and towards the axis of rotation X, whereby an additional sealed chamber 429 is formed between the two axially outer sealing lips A still further embodiment of a sealing device according to the invention is illustrated in figure 5. The sealing device 510 shown in this embodiment comprises a first axially outer sealing lip 528a of the kind shown in figure 2 and comprises a second axially outer sealing lip 528b of the kind shown in figure 1. Both sealing lips 528a and 528b bear against an axially inner surface of the shield 40, but in this embodiment the lips extend to the shield in opposite directions; i.e. the first axially outer lip 528a extends to the shield in a direction away from the axis of rotation X and the second axially outer lip Ξ2Sb extends Luwards the shield in a direction towards the axis of rotation X. Again, an additional sealed chamber 529 is formed between the first and second axially outer sealing lips 528a and 528b.
The different embodiments of the sealing device described allow different sealing actions without requiring different assembly processes.

Claims

1. Sealing device (110, 210, 310, 410, 510) for a rolling contact bearing (1), the sealing device comprising a sealing covering (20) which is arranged between two rings (2, 3) of the rolling contact bearing (1) and further comprising an annular shield
(40) coupled tc a first riny (3) of tne said two rings (2, 3), where the sealing covering (20) is arranged laterally to the annular shield (40) so as to define an annular gap (G) there between, the sealing device being characterized by the fact that it comprises at least one sealing lip (128, 228, 328, 428, 528a, 528b) which is provided on the sealing covering (20) and bears against an axially inner surface of the shield (40) to create a sealed chamber (29, 229, 329, 429, 529) between the sealing covering (20) and the shield (40) .
2. Sealing device according to Claim 1, which is characterised by the fact that the sealing covering (20) is provided with a rigid core member (30) and with an elastic member (22), which partially covers the core member (30) the elastic member comprising a radially outer annular edge (23) and a radially inner distal end (24) : the edge (23) being housed in a first annular groove (7a) of a second ring (2) of the said two rings (2, 3) and the distal end (24) slidingly contacting a second annular groove (7b) of the first ring (3) .
3. Sealing device according to Claim 2, which is characterized by the fact that the distal end (24) of the elastic member (22) is provided with a number o£ lips (24a, ϋ4b, 24c) which extend in an axially inward direction towards a wall surface (7s) of the second annular groove (7b, where at least one lip (24a) of this number of lips forms a labyrinth with an outer diameter surface of the first ring (3) .
4. Sealing device according to Claim 2 or 3, characterized by the fact that the core member (30) comprises a first portion (31) and a second portion (32), where the first portion is outwardly convex and the second portion (32) is essential flat and lies radially inward of the first portion (31) .
5. Sealing device according to Claim 4, which is characterized by the fact that the elastic member (22) comprises a protruding section (25) which is formed on an axially outer surface (21s) of the first portion (31) of the core member (30) and which is provided with a conical surface (25s) .
6. Sealing device according to Claim 5, which is characterized by the fact that the shield (40) is provided with an arch-shaped peripheral edge (41, which together with the conical surface (25s) defines an entrance (Gl) of the annular gap (G, whereby an inwardly convex shape of the peripheral edge (41) tapers the entrance of the annular gap (G) and/or an outwardly concave shape of the peripheral edge (41) creates a oeuLz-Lfugai effect during the rotation of the shield (40) .
7. Sealing device according to any of Claims 4 to 6 , which is characterized by the fact that the at least one sealing lip (128, 228, 328, 428, 528a, 528b) that bears against the shield (40) is formed on an axially outer surface of the second portion (32) of the core member (20) .
8. Sealing device according to Claim 7, characterised by the fact that the at least one sealing lip extends from the second portion (32) towards the shield (40) in a direction away from an axis of rotation (X) of the bearing (1) .
9. Sealing device according to Claim 7, characterised by the fact that the at least one sealing lip extends from the second portion (32) towards the shield (40) in a direction towards the axis of rotation (X) .
10. Sealing device according to Claim 7, characterised by the fact that the device comprises a first and a second sealing lip (328, 428, 528a, 528b) which extend from the second portion (32) of the core member (30) to bear against the shield (40) .
11. Sealing device according to Claim 10, characterised by the fact that the first and second sealing lipc extend in a direction parallel to each other.
12. Sealing device according to Claim 10, characterised by the fact that the first and second seal lips extend towards the shield (40) in opposite directions relative to the axis of rotation (X) .
13. Sealing device according to any of the preceding Claims, characterised by the fact that the shield (40) is coupled to a rotating ring (3) and comprises an assembly portion (42) which engages a cylindrical inner surface of the rotating ring (3) .
14. Sealing device according to any of the preceding claims, characterized in that the shield (40) has a flat portion (45) extending radially and bearing against a side face (3s) of the first ring (3) .
PCT/EP2009/003594 2009-05-20 2009-05-20 Sealing device for rolling contact bearings WO2010133240A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2009/003594 WO2010133240A1 (en) 2009-05-20 2009-05-20 Sealing device for rolling contact bearings
DE112009004785T DE112009004785T5 (en) 2009-05-20 2009-05-20 Sealing device for Wälziager

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/003594 WO2010133240A1 (en) 2009-05-20 2009-05-20 Sealing device for rolling contact bearings

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EP2500593A1 (en) 2011-03-17 2012-09-19 Aktiebolaget SKF Sealing device, notably for a rolling bearing
WO2014060042A1 (en) * 2012-10-19 2014-04-24 Aktiebolaget Skf Rolling bearing with sealing subassembly
FR3018568A1 (en) * 2014-03-11 2015-09-18 Skf Ab BEARING BEARING COMPRISING AN ENVELOPE FOR MAINTAINING ONE OF THE RINGS AND A DEVICE FOR SEALING
DE102015225165A1 (en) 2014-12-15 2016-06-16 Aktiebolaget Skf Rolling bearing comprising a sealing flange
DE102016207676A1 (en) 2015-05-04 2016-11-10 Aktiebolaget Skf Bearing with an elastic sealing flange
DE102016207675A1 (en) 2015-05-04 2016-11-10 Aktiebolaget Skf Bearing with a sealing flange
FR3035930A1 (en) * 2015-05-04 2016-11-11 Skf Ab BEARING COMPRISING A SEALING FLANGE
DE102015220136A1 (en) * 2015-10-16 2017-04-20 Aktiebolaget Skf roller bearing
DE102015220137A1 (en) * 2015-10-16 2017-04-20 Aktiebolaget Skf roller bearing
DE102015220138A1 (en) * 2015-10-16 2017-04-20 Aktiebolaget Skf roller bearing
JP2017180510A (en) * 2016-03-28 2017-10-05 公益財団法人岡山県産業振興財団 Seal structure
DE102017220657A1 (en) 2016-11-25 2018-05-30 Aktiebolaget Skf Sealing device, in particular for a rolling bearing
CN112334671A (en) * 2018-06-19 2021-02-05 舍弗勒技术股份两合公司 Rolling bearing and sealing device with at least two sealing lips

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Publication number Priority date Publication date Assignee Title
EP2500593A1 (en) 2011-03-17 2012-09-19 Aktiebolaget SKF Sealing device, notably for a rolling bearing
EP2500592A1 (en) 2011-03-17 2012-09-19 Aktiebolaget SKF Sealing device, notably for a rolling bearing
WO2014060042A1 (en) * 2012-10-19 2014-04-24 Aktiebolaget Skf Rolling bearing with sealing subassembly
FR3018568A1 (en) * 2014-03-11 2015-09-18 Skf Ab BEARING BEARING COMPRISING AN ENVELOPE FOR MAINTAINING ONE OF THE RINGS AND A DEVICE FOR SEALING
DE102015225165A1 (en) 2014-12-15 2016-06-16 Aktiebolaget Skf Rolling bearing comprising a sealing flange
FR3029995A1 (en) * 2014-12-15 2016-06-17 Skf Ab BEARING BEARING COMPRISING A SEALING FLANGE
KR20160072820A (en) * 2014-12-15 2016-06-23 아크티에볼라게트 에스케이에프 Rolling bearing comprising a sealing flange
JP2016121805A (en) * 2014-12-15 2016-07-07 アクティエボラゲット・エスコーエッフ Rolling bearing with sealing flange
KR102490203B1 (en) * 2014-12-15 2023-01-18 아크티에볼라게트 에스케이에프 Rolling bearing comprising a sealing flange
US9546686B2 (en) 2014-12-15 2017-01-17 Aktiebolaget Skf Rolling bearing comprising a sealing flange
FR3035929A1 (en) * 2015-05-04 2016-11-11 Skf Ab BEARING COMPRISING AN ELASTIC SEALING FLANGE
US9638252B2 (en) 2015-05-04 2017-05-02 Aktiebolaget Skf Bearing comprising a resilient bearing flange
FR3035931A1 (en) * 2015-05-04 2016-11-11 Skf Ab BEARING COMPRISING A SEALING FLANGE
CN106122263A (en) * 2015-05-04 2016-11-16 斯凯孚公司 Bearing including resilient bearing flange
CN106122284A (en) * 2015-05-04 2016-11-16 斯凯孚公司 Bearing including sealing flange
DE102016207675A1 (en) 2015-05-04 2016-11-10 Aktiebolaget Skf Bearing with a sealing flange
DE102016207676A1 (en) 2015-05-04 2016-11-10 Aktiebolaget Skf Bearing with an elastic sealing flange
CN106122284B (en) * 2015-05-04 2020-02-07 斯凯孚公司 Bearing comprising a sealing flange
CN106122263B (en) * 2015-05-04 2019-12-17 斯凯孚公司 Bearing comprising an elastic bearing flange
FR3035930A1 (en) * 2015-05-04 2016-11-11 Skf Ab BEARING COMPRISING A SEALING FLANGE
US9810265B2 (en) 2015-05-04 2017-11-07 Aktiebolaget Skf Bearing having a sealing flange
DE102015220138A1 (en) * 2015-10-16 2017-04-20 Aktiebolaget Skf roller bearing
DE102015220137A1 (en) * 2015-10-16 2017-04-20 Aktiebolaget Skf roller bearing
DE102015220136A1 (en) * 2015-10-16 2017-04-20 Aktiebolaget Skf roller bearing
JP2017180510A (en) * 2016-03-28 2017-10-05 公益財団法人岡山県産業振興財団 Seal structure
DE102017220657A1 (en) 2016-11-25 2018-05-30 Aktiebolaget Skf Sealing device, in particular for a rolling bearing
CN112334671A (en) * 2018-06-19 2021-02-05 舍弗勒技术股份两合公司 Rolling bearing and sealing device with at least two sealing lips

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