US20080265522A1 - Sealing Device with an Integrated Encoder for Bearings - Google Patents

Sealing Device with an Integrated Encoder for Bearings Download PDF

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Publication number
US20080265522A1
US20080265522A1 US11/883,586 US88358606A US2008265522A1 US 20080265522 A1 US20080265522 A1 US 20080265522A1 US 88358606 A US88358606 A US 88358606A US 2008265522 A1 US2008265522 A1 US 2008265522A1
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United States
Prior art keywords
sealing device
race
sealing
peripheral portion
insert
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.)
Abandoned
Application number
US11/883,586
Inventor
Stellario Barbera
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SKF AB
Original Assignee
SKF AB
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Filing date
Publication date
Application filed by SKF AB filed Critical SKF AB
Assigned to AKTIEBOLAGET SKF reassignment AKTIEBOLAGET SKF ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BARBERA, STELLARIO
Publication of US20080265522A1 publication Critical patent/US20080265522A1/en
Abandoned legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
    • 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
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in 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
    • 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

Definitions

  • the present invention refers to a sealing device for bearings with an integrated encoder for detecting relative rotation between the races of a bearing unit.
  • Sealing devices fitted at the sides of a bearing unit in order to seal the gap between the bearing races are well known.
  • these sealing devices are comprised of a metal reinforcing insert of disc-annular shape onto which there is over-moulded or vulcanized a gasket made of rubber or soft elastomeric material forming two peripheral sealing portions: an outer peripheral portion mounted on the stationary outer race of the bearing in order to perform a static sealing action against this race, and an inner peripheral portion with one or more dynamic sealing lips for sliding against the inner, rotatable bearing race.
  • U.S. Pat. No. 5,383,728 discloses a sealing device of the above-mentioned type wherein the conventional metal insert is replaced by a rigid annular insert of plastic polymeric material.
  • the object of the present invention is to provide a light sealing device, involving low manufacturing and assembling costs, allowing to dispose of the conventional metal reinforcing insert and which integrates an impulse ring or encoder for detecting relative rotation between the races of a bearing unit.
  • FIG. 1 is an axial cross-sectional view of a bearing unit fitted with a pair of sealing devices
  • FIGS. 2-5 are enlarged views of four different embodiments of a sealing device according to the invention.
  • a ball bearing unit of conventional design includes a rotatable race 10 , a stationary race 11 and a plurality of balls 12 interposed between the races 10 and 11 .
  • a sealing device 13 , 14 of disc-annular shape is fitted at either opposite side of the bearing in order to seal the gap 15 between the bearing races.
  • each sealing device comprises a relatively rigid disc-annular insert 16 onto which there is over-moulded or vulcanized a gasket 17 of rubber or soft elastomeric material.
  • the gasket 17 forms—in per se known manner—two opposite peripheral sealing portions 18 , 19 intended to perform a static sealing action against the rotatable race 10 and a dynamic sealing action against the stationary race 11 , respectively.
  • the peripheral portion 18 is forcefully inserted in a circumferential groove 20 of the rotatable race 10 so as to fix the sealing device to this race.
  • the peripheral portion 19 forms at least one lip 19 a performing a sliding or labyrinth sealing action against the stationary race 11 .
  • the insert 16 is made of a matrix of thermoplastic material loaded with a powder of magnetized or magnetizable material, preferably ferrite.
  • the thermoplastic matrix has a softening temperature exceeding 180° C. It may for example consist of polyamide (Nylon 66), or polyimide, or polyethylene-ether-sulphonate, or polyetheretherketone (PEEK).
  • the insert 16 besides reinforcing mechanically the sealing device, performs the functions of an impulse ring or encoder for a rotation detecting device associated with the bearing and capable of detecting relative rotation between the races 10 and 11 .
  • the one according to the present invention is fixable to the rotatable bearing race, in order to be driven for rotation therewith and work as an annular encoder.
  • the insert 16 Prior to or after over-moulding or vulcanization of the gasket 17 , the insert 16 is polarized magnetically so as to form, in predetermined angular zones or fields, a sequence of suitably alternate and/or spaced north/south poles.
  • the magnetic properties are given to the insert 16 by an apparatus that permanently magnetizes the ferrite in predetermined zones with the desired polar orientation.
  • the impulse ring is operatively facing an associated sensor or magnetoelectric transducer (not shown) mounted on a fixed part.
  • an associated sensor or magnetoelectric transducer (not shown) mounted on a fixed part.
  • the magnetic flux linked by the transducer varies as the magnetized zones of the insert 16 pass in front of the transducer, which provides electric pulses indicative of rotation data (angular position, speed, acceleration, etc.) of the rotatable race.
  • the electric signals provided by the transducer are transmitted to an electronic processing unit and processed by this in order to obtain information concerning the motion of the rotatable race.
  • FIGS. 2-5 show axial cross-sections of four forms that the insert 16 and the elastic gasket 17 may take, in accordance with the geometric features of the bearing onto which the sealing device is to be mounted and the working conditions of the bearing.
  • the insert 16 may be bent and shaped at different points in order to increase its flexural strength and improve the anchoring of the rubber gasket 17 .
  • peripheral sealing portions 18 , 19 may indifferently be formed on the outer or inner peripheral edges of the sealing device, depending on whether this is intended to be applied to a bearing unit with a stationary outer race and a rotatable inner race, or vice versa.

Abstract

A sealing device is to be fitted at a side of a bearing unit in order to seal a gap (15) between a stationary race (11) and a rotatable race (10) of the bearing unit. The device includes a relatively rigid reinforcing insert (16) of disc-annular shape, and a gasket (17) of relatively soft rubber or elastomeric material, over-moulded or vulcanized onto the insert (16). The gasket forms two opposite peripheral sealing portions (18, 19) intended to perform a static sealing action against the rotatable race (10) and a dynamic sealing action on the stationary race (11), respectively.
The insert (16) includes magnetized or magnetizable material for forming, at predetermined angular zones or fields, a sequence of alternate and/or spaced north/south poles, in order to act as an encoder.

Description

  • The present invention refers to a sealing device for bearings with an integrated encoder for detecting relative rotation between the races of a bearing unit.
  • Sealing devices fitted at the sides of a bearing unit in order to seal the gap between the bearing races are well known. Generally, these sealing devices are comprised of a metal reinforcing insert of disc-annular shape onto which there is over-moulded or vulcanized a gasket made of rubber or soft elastomeric material forming two peripheral sealing portions: an outer peripheral portion mounted on the stationary outer race of the bearing in order to perform a static sealing action against this race, and an inner peripheral portion with one or more dynamic sealing lips for sliding against the inner, rotatable bearing race.
  • U.S. Pat. No. 5,383,728 discloses a sealing device of the above-mentioned type wherein the conventional metal insert is replaced by a rigid annular insert of plastic polymeric material.
  • There are also known sealing devices for bearings incorporating a magnetic impulse ring or encoder fixed to a protective metal shield mounted on the rotatable bearing race. See, for example, U.S. Pat. No. 6,776,420. In use, the impulse ring faces a fixed sensor which detects the relative speed of rotation between the outer and inner bearing races.
  • The object of the present invention is to provide a light sealing device, involving low manufacturing and assembling costs, allowing to dispose of the conventional metal reinforcing insert and which integrates an impulse ring or encoder for detecting relative rotation between the races of a bearing unit.
  • This object is accomplished, in accordance with the invention, by a sealing device as defined in the appended claims.
  • A few preferred but not limiting embodiments of the invention will now be described, reference being made to the accompanying drawings, in which:
  • FIG. 1 is an axial cross-sectional view of a bearing unit fitted with a pair of sealing devices; and
  • FIGS. 2-5 are enlarged views of four different embodiments of a sealing device according to the invention.
    •
  • With reference initially to FIG. 1, a ball bearing unit of conventional design includes a rotatable race 10, a stationary race 11 and a plurality of balls 12 interposed between the races 10 and 11. A sealing device 13, 14 of disc-annular shape is fitted at either opposite side of the bearing in order to seal the gap 15 between the bearing races.
  • As best shown in FIG. 2, each sealing device comprises a relatively rigid disc-annular insert 16 onto which there is over-moulded or vulcanized a gasket 17 of rubber or soft elastomeric material. The gasket 17 forms—in per se known manner—two opposite peripheral sealing portions 18, 19 intended to perform a static sealing action against the rotatable race 10 and a dynamic sealing action against the stationary race 11, respectively. The peripheral portion 18 is forcefully inserted in a circumferential groove 20 of the rotatable race 10 so as to fix the sealing device to this race. The peripheral portion 19 forms at least one lip 19 a performing a sliding or labyrinth sealing action against the stationary race 11.
  • According to the invention, the insert 16 is made of a matrix of thermoplastic material loaded with a powder of magnetized or magnetizable material, preferably ferrite. Preferably, the thermoplastic matrix has a softening temperature exceeding 180° C. It may for example consist of polyamide (Nylon 66), or polyimide, or polyethylene-ether-sulphonate, or polyetheretherketone (PEEK).
  • Owing to the above arrangement, the insert 16, besides reinforcing mechanically the sealing device, performs the functions of an impulse ring or encoder for a rotation detecting device associated with the bearing and capable of detecting relative rotation between the races 10 and 11. It will be noted that, contrary to conventional sealing devices, the one according to the present invention is fixable to the rotatable bearing race, in order to be driven for rotation therewith and work as an annular encoder.
  • Prior to or after over-moulding or vulcanization of the gasket 17, the insert 16 is polarized magnetically so as to form, in predetermined angular zones or fields, a sequence of suitably alternate and/or spaced north/south poles. The magnetic properties are given to the insert 16 by an apparatus that permanently magnetizes the ferrite in predetermined zones with the desired polar orientation.
  • Once the sealing device is mounted in the bearing unit, the impulse ring is operatively facing an associated sensor or magnetoelectric transducer (not shown) mounted on a fixed part. As the rotatable race 10 rotates, the magnetic flux linked by the transducer varies as the magnetized zones of the insert 16 pass in front of the transducer, which provides electric pulses indicative of rotation data (angular position, speed, acceleration, etc.) of the rotatable race. The electric signals provided by the transducer are transmitted to an electronic processing unit and processed by this in order to obtain information concerning the motion of the rotatable race.
  • By way of example, FIGS. 2-5 show axial cross-sections of four forms that the insert 16 and the elastic gasket 17 may take, in accordance with the geometric features of the bearing onto which the sealing device is to be mounted and the working conditions of the bearing. The insert 16 may be bent and shaped at different points in order to increase its flexural strength and improve the anchoring of the rubber gasket 17.
  • It is to be understood that the invention is not limited to the embodiments described and illustrated herein, which are to be considered as implemented examples of the sealing device. Rather, the invention is likely to undergo modifications as to the shape and location of parts, constructional and functional details and materials used. For example, the peripheral sealing portions 18, 19 may indifferently be formed on the outer or inner peripheral edges of the sealing device, depending on whether this is intended to be applied to a bearing unit with a stationary outer race and a rotatable inner race, or vice versa.

Claims (7)

1. A sealing device for bearings, configured to be fitted at a side of a bearing unit to seal laterally a gap between a stationary race and a rotatable race of the bearing unit, the sealing device comprising:
a rigid reinforcing insert of disc-annular shape, and
a gasket of rubber or elastomeric material, over-moulded or vulcanized onto the reinforcing insert, the gasket forming two opposite peripheral sealing portions configured to perform a static sealing action against one of the races and a dynamic sealing action against the other of the races,
wherein the opposite peripheral sealing portions comprise:
a first peripheral portion forming a seal against the rotatable race and
a second peripheral portion forming a dynamic seal on the stationary race, and wherein the insert comprises magnetized or magnetizable material for forming, at predetermined angular zones or fields, a sequence of alternate and/or spaced north/south poles, to act as an encoder.
2. A sealing device according to claim 1, wherein the insert comprises a matrix of plastic material loaded with a powder of magnetized or magnetizable material.
3. A sealing device according to claim 2, wherein the matrix comprises thermoplastic material having a softening temperature exceeding 180° C.
4. A sealing device according to claim 3, wherein the thermoplastic matrix is a material chosen from the group consisting of: polyamide (Nylon 66), polyimide, polyethylene-ether-sulphonate, polyetheretherketone (PEEK).
5. A sealing device according to claim 1, wherein the first peripheral portion is radially outer and the second peripheral portion is radially inner.
6. A sealing device according to claim 1, wherein the first peripheral portion is radially inner and the second peripheral portion is radially outer.
7. A sealing device according to claim 1, further comprising fixing means for fixing the device to the rotatable race of a bearing unit.
US11/883,586 2005-02-15 2006-02-15 Sealing Device with an Integrated Encoder for Bearings Abandoned US20080265522A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000088A ITTO20050088A1 (en) 2005-02-15 2005-02-15 SEALING DEVICE FOR BEARINGS WITH INTEGRATED ENCODER.
ITT02005A000088 2005-02-15
PCT/EP2006/050957 WO2006087339A1 (en) 2005-02-15 2006-02-15 A sealing device with an integrated encoder for bearings

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/050957 A-371-Of-International WO2006087339A1 (en) 2005-02-15 2006-02-15 A sealing device with an integrated encoder for bearings

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/330,493 Division US8371757B2 (en) 2005-02-15 2011-12-19 Sealing device with an integrated encoder for bearings

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US20080265522A1 true US20080265522A1 (en) 2008-10-30

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US11/883,586 Abandoned US20080265522A1 (en) 2005-02-15 2006-02-15 Sealing Device with an Integrated Encoder for Bearings
US13/330,493 Active US8371757B2 (en) 2005-02-15 2011-12-19 Sealing device with an integrated encoder for bearings

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Application Number Title Priority Date Filing Date
US13/330,493 Active US8371757B2 (en) 2005-02-15 2011-12-19 Sealing device with an integrated encoder for bearings

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US (2) US20080265522A1 (en)
EP (1) EP1851457B1 (en)
JP (1) JP5090931B2 (en)
CN (1) CN100591937C (en)
IT (1) ITTO20050088A1 (en)
WO (1) WO2006087339A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090166977A1 (en) * 2006-07-20 2009-07-02 Carl Freudenberg Kg Seal
WO2013001329A1 (en) * 2011-06-28 2013-01-03 Aktiebolaget Skf Sealed bearing assembly with magnet on sealing disc to attract metallic particles
US9581201B2 (en) 2012-12-20 2017-02-28 Schaeffler Technologies AG & Co. KG Bearing
US20180348016A1 (en) * 2015-11-26 2018-12-06 Schaeffler Technologies AG & Co. KG Encoder and bearing unit comprising an encoder

Families Citing this family (5)

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WO2010116208A1 (en) * 2009-04-08 2010-10-14 Aktiebolaget Skf Ring for a rolling bearing system and rolling bearing system comprising such a ring
ITTO20101041A1 (en) * 2010-12-22 2012-06-23 Skf Ab SEALING UNIT FOR VOLTAGE BEARINGS
TWI512217B (en) * 2013-07-30 2015-12-11 Hiwin Tech Corp Ball screw with magnetic dustproof device
CN109883453A (en) * 2019-03-11 2019-06-14 安徽库伯密封技术有限公司 A kind of plastics magnetic encoder and its manufacturing process
CN117310574B (en) * 2023-11-28 2024-02-13 华中科技大学 Method for acquiring magnetic field conversion matrix, external magnetic field measurement method and system

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US5575568A (en) * 1995-02-09 1996-11-19 S.K.F. France Encoder device for a rotational speed sensor and rolling-contact bearing equipped with such a device
US6065879A (en) * 1996-01-19 2000-05-23 Nsk Ltd. Rolling bearing with seal
US20020126926A1 (en) * 2001-03-07 2002-09-12 Ntn Corporation Wheel support bearing assembly
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US5383728A (en) * 1991-11-06 1995-01-24 Skf Industries S.P.A. Sealing shield, particularly for rolling bearings
US5575568A (en) * 1995-02-09 1996-11-19 S.K.F. France Encoder device for a rotational speed sensor and rolling-contact bearing equipped with such a device
US6065879A (en) * 1996-01-19 2000-05-23 Nsk Ltd. Rolling bearing with seal
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090166977A1 (en) * 2006-07-20 2009-07-02 Carl Freudenberg Kg Seal
WO2013001329A1 (en) * 2011-06-28 2013-01-03 Aktiebolaget Skf Sealed bearing assembly with magnet on sealing disc to attract metallic particles
US9581201B2 (en) 2012-12-20 2017-02-28 Schaeffler Technologies AG & Co. KG Bearing
US20180348016A1 (en) * 2015-11-26 2018-12-06 Schaeffler Technologies AG & Co. KG Encoder and bearing unit comprising an encoder

Also Published As

Publication number Publication date
EP1851457A1 (en) 2007-11-07
EP1851457B1 (en) 2015-05-06
CN100591937C (en) 2010-02-24
ITTO20050088A1 (en) 2006-08-16
WO2006087339A8 (en) 2007-12-27
US8371757B2 (en) 2013-02-12
JP5090931B2 (en) 2012-12-05
JP2009526949A (en) 2009-07-23
CN101142419A (en) 2008-03-12
WO2006087339A1 (en) 2006-08-24
US20120087610A1 (en) 2012-04-12

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AS Assignment

Owner name: AKTIEBOLAGET SKF, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BARBERA, STELLARIO;REEL/FRAME:020884/0634

Effective date: 20070820

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION