WO2016083133A1 - Palier étanche - Google Patents

Palier étanche Download PDF

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Publication number
WO2016083133A1
WO2016083133A1 PCT/EP2015/076324 EP2015076324W WO2016083133A1 WO 2016083133 A1 WO2016083133 A1 WO 2016083133A1 EP 2015076324 W EP2015076324 W EP 2015076324W WO 2016083133 A1 WO2016083133 A1 WO 2016083133A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
radial
stepped portion
bearing
oriented surface
Prior art date
Application number
PCT/EP2015/076324
Other languages
English (en)
Inventor
Elie AUPETITGENDRE
Stellario Barbera
Michel Organisciak
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
Priority claimed from GB1503122.2A external-priority patent/GB2538042A/en
Application filed by Aktiebolaget Skf filed Critical Aktiebolaget Skf
Publication of WO2016083133A1 publication Critical patent/WO2016083133A1/fr

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
    • 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
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7826—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of the opposing surface cooperating with the seal, e.g. a shoulder surface of a bearing 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
    • 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
    • F16C33/7846—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 a gap between the annular disc and 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • 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
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant

Definitions

  • the invention relates to a rolling element bearing comprising a non-contact seal for enclosing a radial gap between an inner ring and an outer ring of the bearing.
  • seals are typically used to retain a lubricant within a cavity of the bearing and to prevent the ingress of moisture and particulate contaminants.
  • non-contact seals or shields are often used. Such seals necessarily have the benefit of generating significantly less friction than, for example, a seal with an elastomeric contact lip, but do not always provide sufficient protection against the ingress of contaminants.
  • the bearing inner ring has a recessed portion with a diameter that is smaller than a shoulder of the inner ring, which shoulder adjoins the inner raceway.
  • the recessed portion has an axially oriented surface and a radially oriented surface.
  • the seal extends into the recessed portion and has surfaces that face the axially and radially oriented surfaces of the recessed portion with a small gap.
  • the present invention resides in a rolling element bearing comprising an inner ring, an outer ring and a seal for enclosing a radial gap between the inner and outer rings, which is mounted to the outer ring.
  • the inner ring comprises a shoulder part, adjacent to an inner raceway for rolling elements of the bearing, and further comprises first and second stepped portions.
  • the shoulder part has a diameter D s ;
  • the first stepped portion has diameter Di and the second stepped portion has a diameter D 2 , whereby D 2 ⁇ Di ⁇ D s.
  • the seal comprises a first radial seal portion that extends into the first stepped portion of the inner ring, and further comprises a second radial seal portion that extends into the second stepped portion.
  • a gap between opposing surfaces of the first and second radial seal portions and the first and second stepped portions respectively creates a labyrinth sealing region.
  • the labyrinth sealing region comprises:
  • the complementary geometry of the inner ring stepped portions and the radial seal portions creates a labyrinth with at least two axial and at least two radial gap sections.
  • a labyrinth acts as a highly effective barrier, to prevent the ingress of moisture and other contaminants.
  • the bearing is a deep-groove ball bearing which is filled with a grease lubricant, prior to being fitted at each axial side with a seal having radial portions as described above.
  • the seal further comprises a non-contacting axial seal portion that extends over the inner ring shoulder. A third radial gap section is created between a radially outer surface of the shoulder and a radially inner surface of the axial seal portion.
  • the third radial gap forms part of the labyrinth sealing region and not only helps to prevent the ingress of contamination into the bearing cavity, but also helps to prevent the leakage of lubricant out of the bearing cavity.
  • the axial and radial gap sections have a gap width of between 0.01 and 0.5 mm and a gap length that is at least two times greater than the gap width.
  • the gap width is selected such that no contact occurs between the inner ring and the seal in a position of maximum expected relative displacement.
  • the seal for use in a sealed bearing according to the invention is manufactured as a single part from the same material.
  • the seal may be made from metal or from a polymer material.
  • the seal comprises an annular insert, from which the radial seal portions extend, whereby the seal is mounted to a groove in the bearing outer ring at an outer diameter of the annular insert.
  • surfaces of the seal which form part of the labyrinth sealing region may be provided with grooves for catching grease and contaminants.
  • an axially outer surface of the inner ring comprises an indentation, at a diameter on the ring that is slightly smaller than the diameter D 2 of the second stepped portion.
  • the indentation creates a small overhang which, during rotation of the inner ring, acts as a splash deflector, providing the entrance to the labyrinth sealing region with additional protection against the ingress of contaminants.
  • Fig.1 a is a cross-sectional view of part of a sealed bearing according to the invention, showing part of an inner ring of the bearing and part of the seal;
  • Fig. 1 b shows the inner ring part
  • Fig. 1 c shows the seal part.
  • the sealed bearing comprises a deep- groove ball bearing, which has an outer ring (not shown) and an inner ring 1 10 that is rotatable about an axis of rotation 105.
  • the seal has a casing element 121 that is mounted to the outer ring.
  • the casing element may comprise an annular metal insert that is e.g. fitted into a groove in an inner circumference of the outer ring.
  • the insert is covered by a polymer material at the mounting interface with the outer ring.
  • the seal 120 is a non-contact seal which is designed to provide excellent sealing in terms of preventing contamination from entering a cavity of the bearing, between the inner and outer rings.
  • the depicted embodiment is also optimized in terms of preventing leakage of a lubricant that is contained within the bearing cavity. This is achieved according to the invention by means of a complementary geometry between the bearing inner ring 1 10 and a radially inner section of the seal 123.
  • the inner ring 1 10 of the bearing has a shoulder part 1 1 1 1 , which is adjacent to an inner raceway (not shown) that is provided on the inner ring as a running track for the balls of the bearing.
  • the shoulder part 1 1 1 has a maximum diameter Ds.
  • the inner ring further comprises a first stepped portion, adjacent to the shoulder part 1 1 1 , which has a maximum diameter Di that is smaller than D s .
  • the first stepped portion has an axially oriented surface 1 12 and a radially oriented surface 1 15.
  • the inner ring further comprises a second stepped portion, adjacent to the first stepped portion.
  • the second stepped portion comprises an axially oriented surface 1 17 and a radially oriented surface 1 18.
  • the radially inner section of the seal 122 has an axial portion 126 that extends in an axially inward direction from the casing element 121 and has first and second radial portions 123, 124 that extend from the casing element in a radially inward direction.
  • the first radial seal portion 123 extends into the first stepped portion of the inner ring 1 10; the second radial seal portion 124 extends into the second stepped portion of the inner ring.
  • the casing element 121 and radially inner seal section 122 are preferably formed as a single part from the same material, which may be a metal or polymer material.
  • a labyrinth sealing region is created by a gap between opposing surfaces of the inner ring 1 10 and the radially inner section 122 of the seal.
  • the labyrinth sealing region comprises:
  • the above mentioned axial and radial gap sections of the labyrinth sealing region have a gap width of between 0.01 and 0.5 mm, and gap length which is at least two times greater than the gap width.
  • the gap width is as small as possible, while allowing for relative axial and radial displacements between the inner ring, without contact taking place.
  • the inner ring is provided with a feature that acts as a splash deflector.
  • a feature that acts as a splash deflector At the axial periphery of the inner ring 1 10, at a diameter only slightly smaller than the maximum diameter D 2 of the second stepped portion, an indentation 1 19 is provided. The indentation creates an overhang which, during rotation of the inner ring, deflects moisture and other contaminants away from the entrance to the second axial gap section.
  • the labyrinth sealing region further comprises a third radial gap section, between the radially outer surface of the inner ring shoulder 1 1 1 and a radially inner surface 131 of the axial portion 122 of the seal.
  • the third radial gap further enhances the exclusion functionality of the labyrinth and helps to prevent the leakage of lubricant.
  • the radially inner surface 131 of the axial portion, or the surface of any other portion of the radially inner seal section 122 that faces the labyrinth sealing region may be provided with grooves for catching grease or contaminants.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

La présente invention concerne un palier à éléments roulants comprenant une bague intérieure (110), une bague extérieure et un joint d'étanchéité (120) pour enfermer un espace radial entre les bagues intérieure et extérieure, qui est monté sur la bague extérieure. La bague intérieure comprend une partie épaulement (111), adjacente à un chemin de roulement intérieur pour éléments roulants du palier, et comprend en outre des première et seconde parties étagées. La partie épaulement a un diamètre Ds ; la première partie étagée a un diamètre D1 et la seconde partie étagée a un diamètre D2, où D2 < D1 < Ds. Selon l'invention, le joint d'étanchéité comprend une première partie d'étanchéité radiale (123) qui s'étend dans la première partie étagée de la bague intérieure, et comprend en outre une seconde partie d'étanchéité radiale (124) qui s'étend dans la seconde partie étagée. Un espace entre des surfaces opposées des première et seconde parties d'étanchéité radiales et les première et seconde parties étagées crée respectivement une région d'étanchéité à labyrinthe.
PCT/EP2015/076324 2014-11-28 2015-11-11 Palier étanche WO2016083133A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EPPCT/EP2014/076014 2014-11-28
EP2014076014 2014-11-28
GB1503122.2A GB2538042A (en) 2014-11-28 2015-02-25 Sealed bearing
GB1503122.2 2015-02-25

Publications (1)

Publication Number Publication Date
WO2016083133A1 true WO2016083133A1 (fr) 2016-06-02

Family

ID=54478785

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/076324 WO2016083133A1 (fr) 2014-11-28 2015-11-11 Palier étanche

Country Status (1)

Country Link
WO (1) WO2016083133A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10174790B2 (en) 2016-01-26 2019-01-08 Jtekt Corporation Rolling bearing
US10221893B2 (en) 2015-06-03 2019-03-05 Jtekt Corporation Rolling bearing
US10260561B2 (en) * 2017-03-22 2019-04-16 Jtekt Corporation Rolling bearing
US10539183B2 (en) 2017-03-31 2020-01-21 Jtekt Corporation Rolling bearing
US10788075B2 (en) 2017-10-04 2020-09-29 Jtekt Corporation Ball bearing
US11300158B2 (en) * 2019-07-12 2022-04-12 Aktiebolaget Skf Small cross-section bearing unit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350148A (en) * 1966-02-11 1967-10-31 Gen Bearing Co Ball bearing seal assembly
DE1525188A1 (de) * 1964-12-21 1969-08-14 Nippon Seiko K K Abgedichtete Lager
EP0894990A1 (fr) * 1997-07-31 1999-02-03 Minebea Kabushiki Kaisha Palier à double joint d'étanchéité
EP0930444A2 (fr) * 1998-01-20 1999-07-21 Minebea Co., Ltd. Unité de palier composé
EP0957563A2 (fr) * 1998-05-14 1999-11-17 Minebea Kabushiki Kaisha Moteur de broche et unité à disque dur comprenant un tel moteur
JP2004293563A (ja) * 2003-03-25 2004-10-21 Koyo Seiko Co Ltd 玉軸受

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1525188A1 (de) * 1964-12-21 1969-08-14 Nippon Seiko K K Abgedichtete Lager
US3350148A (en) * 1966-02-11 1967-10-31 Gen Bearing Co Ball bearing seal assembly
EP0894990A1 (fr) * 1997-07-31 1999-02-03 Minebea Kabushiki Kaisha Palier à double joint d'étanchéité
EP0930444A2 (fr) * 1998-01-20 1999-07-21 Minebea Co., Ltd. Unité de palier composé
EP0957563A2 (fr) * 1998-05-14 1999-11-17 Minebea Kabushiki Kaisha Moteur de broche et unité à disque dur comprenant un tel moteur
JP2004293563A (ja) * 2003-03-25 2004-10-21 Koyo Seiko Co Ltd 玉軸受

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10221893B2 (en) 2015-06-03 2019-03-05 Jtekt Corporation Rolling bearing
US10174790B2 (en) 2016-01-26 2019-01-08 Jtekt Corporation Rolling bearing
US10253813B2 (en) 2016-01-26 2019-04-09 Jtekt Corporation Rolling bearing
US10260561B2 (en) * 2017-03-22 2019-04-16 Jtekt Corporation Rolling bearing
US10539183B2 (en) 2017-03-31 2020-01-21 Jtekt Corporation Rolling bearing
US10788075B2 (en) 2017-10-04 2020-09-29 Jtekt Corporation Ball bearing
US11300158B2 (en) * 2019-07-12 2022-04-12 Aktiebolaget Skf Small cross-section bearing unit

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