WO2016000738A1 - Bague d'impulsion pour une unité roulement a capteur, et unité roulement a capteur comprenant une telle bague d'impulsion - Google Patents

Bague d'impulsion pour une unité roulement a capteur, et unité roulement a capteur comprenant une telle bague d'impulsion Download PDF

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Publication number
WO2016000738A1
WO2016000738A1 PCT/EP2014/063832 EP2014063832W WO2016000738A1 WO 2016000738 A1 WO2016000738 A1 WO 2016000738A1 EP 2014063832 W EP2014063832 W EP 2014063832W WO 2016000738 A1 WO2016000738 A1 WO 2016000738A1
Authority
WO
WIPO (PCT)
Prior art keywords
holder
impulse ring
bearing unit
boss
sensor bearing
Prior art date
Application number
PCT/EP2014/063832
Other languages
English (en)
Inventor
Pierrick Maze
Sylvain Chaussat
Bénédicte LAROCHE
Vincent Sausset
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/EP2014/063832 priority Critical patent/WO2016000738A1/fr
Publication of WO2016000738A1 publication Critical patent/WO2016000738A1/fr

Links

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
    • G01P3/443—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
    • 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
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/80—Manufacturing details of magnetic targets for magnetic encoders

Definitions

  • the invention concerns an impulse ring for a sensor bearing unit and a sensor bearing unit comprising such an impulse ring.
  • sensor bearing units are commonly used in automotive industry, aeronautics and other technical fields. These units provide high quality signals and transmissions, while allowing integration in simpler and more compact apparatuses.
  • Such sensor bearing units generally comprise a bearing, an impulse ring and detection means facing the impulse ring.
  • the impulse ring comprises a target holder and a target including alternating North and South poles, whose number depends on the bearing size and particular applications.
  • the impulse ring may be fixed to a rotating ring of this bearing, while the detection means may be fixed to a non rotating ring of this bearing.
  • the impulse ring comprises a magnetized portion, which is attached to a tubular portion of the holder of the impulse ring.
  • a design is known from FR-A-2 884 367, in which the holder comprises an inner portion, which is attached to the inner ring of a bearing, a radial portion, and an outer tubular portion, which holds the magnetized portion.
  • the radial portion and the outer tubular portion form a right angle, which can be damaged in case of high rotation speeds and vibrations during operation of the impulse ring.
  • the available space to integrate the detection means is generally not large enough to permit a proper integration of some types of detection means.
  • the aim of the invention is to provide an impulse ring which has a holder which better undergoes high rotation speeds and vibrations, and provides a large space to integrate the detection means.
  • the invention concerns an impulse ring for a sensor bearing unit comprising a magnetized portion which generates a magnetic field adapted to be sensed by detection means, the magnetized portion being mounted on a holder fixed to a rotatable ring of a bearing of the sensor bearing unit, the holder comprising an outer tubular portion and a radial portion which define an inner housing in which the magnetized portion is fixed, whereas the holder comprises, at the intersection of the tubular portion with the radial portion of the holder, an inwardly protruding boss which extends on the whole circumference of the holder.
  • the mechanical resistance of the holder at high rotation speeds is improved, and the peak of magnetic field is shifted away from the radial portion of the holder, which permits a better integration of the sensing element. Moreover, less magnetized material is required, permitting a reduced weight and cost of the unit.
  • such an impulse ring may incorporate one or several of the following features:
  • the boss is formed by deformation of the transversal section of the holder, without changing its thickness with respect to the tubular portion and radial portion.
  • the boss presents two annular surfaces which form a right angle between each other, and which form right angles with the tubular portion and the radial portion.
  • the boss presents a cylindrical band attached to the radial portion and a frustoconical band attached to the tubular portion.
  • the frustoconical band of the boss makes an angle with respect to an axial direction which is comprised between 45° and 75° , peferably equal to 60° .
  • the radial portion of the holder is partially inclined with respect to a central axis of the impulse ring.
  • the invention also concerns a sensor bearing unit comprising a bearing and an impulse ring as mentioned here-above.
  • FIG. 1 is a perspective view of a sensor bearing unit according to the invention, comprising an impulse ring according to the invention
  • figure 2 is an axial sectional view of the sensor bearing unit of figure 1 ,
  • figure 3 is a sectional view at a larger scale of detail III on figure 2.
  • the sensor bearing unit 10 is adapted to equip a non-shown apparatus, such as a motor, a brake system, a suspension system or any rotating machine, in particular for an automotive vehicle.
  • Sensor bearing unit 10 comprises a bearing 20 including a rotating inner ring 22 and a stationary outer ring 24.
  • Inner ring 22 rotates with respect to outer ring 24 around a central axis X-X'.
  • Bearing 20 also comprises balls 26 located between inner ring 22 and outer ring 24.
  • rollers or needles can be used as rolling elements for bearing 20, instead of balls 26.
  • Sensor bearing unit 10 also includes a magnetic impulse ring 40 mounted on inner ring 22, and which comprises a target holder 42 and a target formed by a magnetized portion 44.
  • Target holder 42 is fixed to inner ring 22 and extends beyond outer ring 24, radially to axis X-X'.
  • Magnetized portion 44 is fixed to target holder 42 by press mounting or by overmoulding.
  • Target holder 42 is manufactured by stamping.
  • Impulse ring 40 generates a magnetic field adapted to be sensed by detection means 100, which are represented on figures 2 and 3 with phantom lines.
  • detection means 100 may include Hall-effect sensors.
  • Detection means 100 may be fixed to outer ring 24 by non-shown fastening means.
  • Holder 42 comprises an outer tubular portion 420 and a radial portion 422. Outer tubular portion 420 and radial portion 422 define an inner housing H in which the magnetized portion 44 is fixed. At the intersection of the tubular portion 420 and radial portion 422, holder 42 comprises an inwardly protruding boss 430, which extends on the whole circumference of holder 42.
  • the boss 430 is formed by deformation of the transversal section of holder 42.
  • the thickness of holder 42 in the area of boss 430 is the same as in the areas of radial portion 422 and tubular portion 420.
  • the boss 430 presents a cylindrical band 430a centered on axis X-X' which is attached to radial portion 422, and a frustoconical band 430b which is attached to tubular portion 420.
  • the frustoconical band 430b makes an angle A, with respect to an axial direction ⁇ parallel to central axis X-X, which may be comprised between 45° and 75° , preferably equal to 60° .
  • Boss 430 permits to improve the mechanical resistance of holder 4 at high rotation speeds, such as at 22 000 rotations per minute (rpm).
  • Boss 430 also reduces the quantity of magnetized matter of the magnetized portion
  • Impulse ring 40 generates a magnetic field is represented by curved lines L1 on figures 2 and 3.
  • the shape of the magnetic field depends on the shape and location of magnetized portion 44.
  • detection means 100 In order to obtain a satisfying detection accuracy, detection means 100 must be placed in an area corresponding to the peak P of the magnetic field generated by magnetized portion 44.
  • Peak P forms an annular shaped zone centered on axis X-X' and located axially between an axial edge 400 of impulse ring 40 and radial portion 422, and radially between outer ring 24 and magnetized portion 44. Thanks to boss 430, peak P is closer to axial edge 400 than to radial portion 422. Peak P is therefore axially shifted away from radial portion 422 in comparison with the impulse rings of the prior art.
  • the space available to integrate detection means 100 is therefore larger.
  • radial portion 422 is partially inclined with respect to axis X-X'.
  • radial portion 422 comprises three inclined sections 422a, 422b and 422c which improve the stiffness of holder 42.
  • the boss 430 may present two annular surfaces which form a right angle between each other, and which form right angles, respectively, with tubular portion 420 and radial portion 422.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

L'invention concerne une bague d'impulsion (40) pour une unité roulement à capteur (10), qui comprend une partie magnétisée (44) qui génère un champ magnétique (LI) conçu pour être détecté par des moyens de détection (100). La partie magnétisée (44) est montée sur un support (42) fixé à une bague rotative (22) d'un roulement (20) de l'unité roulement à capteur (10). Le support (42) comprend une partie tubulaire radialement externe (420) et une partie paroi radiale (422) qui définissent un logement radialement interne (H) dans lequel la partie magnétisée (44) est fixée. Le support (40) comprend, à l'intersection de la partie tubulaire (420) et de la partie radiale (422) du support (42), un bossage faisant saillie vers l'intérieur (430) qui s'étend sur toute la circonférence du support (42). Le bossage est défini par une section de paroi étagée s'étendant vers l'intérieur entre la paroi radiale (422) et la partie tubulaire cylindrique (420) obtenue par déformation du support sans changer son épaisseur.
PCT/EP2014/063832 2014-06-30 2014-06-30 Bague d'impulsion pour une unité roulement a capteur, et unité roulement a capteur comprenant une telle bague d'impulsion WO2016000738A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/063832 WO2016000738A1 (fr) 2014-06-30 2014-06-30 Bague d'impulsion pour une unité roulement a capteur, et unité roulement a capteur comprenant une telle bague d'impulsion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/063832 WO2016000738A1 (fr) 2014-06-30 2014-06-30 Bague d'impulsion pour une unité roulement a capteur, et unité roulement a capteur comprenant une telle bague d'impulsion

Publications (1)

Publication Number Publication Date
WO2016000738A1 true WO2016000738A1 (fr) 2016-01-07

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PCT/EP2014/063832 WO2016000738A1 (fr) 2014-06-30 2014-06-30 Bague d'impulsion pour une unité roulement a capteur, et unité roulement a capteur comprenant une telle bague d'impulsion

Country Status (1)

Country Link
WO (1) WO2016000738A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220196076A1 (en) * 2020-12-22 2022-06-23 Aktiebolaget Skf Method for manufacturing a target holder for sensor bearing unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2884367A1 (fr) 2005-04-08 2006-10-13 Valeo Equip Electr Moteur Cible appartenant a des moyens de suivi de la position d'un rotor d'une machine electrique tournante et machine electrique tournante comportant une telle cible
FR2907895A1 (fr) * 2006-10-31 2008-05-02 Snr Roulements Sa Codeur comprenant une zone de rigidification
WO2009081033A2 (fr) * 2007-12-19 2009-07-02 Valeo Equipements Electriques Moteur Machine electrique tournante equipee de moyens de determination de la position angulaire du rotor
WO2011135199A1 (fr) * 2010-04-30 2011-11-03 Ntn-Snr Roulements Assemblage instrumenté et rondelle frein associée

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2884367A1 (fr) 2005-04-08 2006-10-13 Valeo Equip Electr Moteur Cible appartenant a des moyens de suivi de la position d'un rotor d'une machine electrique tournante et machine electrique tournante comportant une telle cible
FR2907895A1 (fr) * 2006-10-31 2008-05-02 Snr Roulements Sa Codeur comprenant une zone de rigidification
WO2009081033A2 (fr) * 2007-12-19 2009-07-02 Valeo Equipements Electriques Moteur Machine electrique tournante equipee de moyens de determination de la position angulaire du rotor
WO2011135199A1 (fr) * 2010-04-30 2011-11-03 Ntn-Snr Roulements Assemblage instrumenté et rondelle frein associée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220196076A1 (en) * 2020-12-22 2022-06-23 Aktiebolaget Skf Method for manufacturing a target holder for sensor bearing unit
US20230044031A1 (en) * 2020-12-22 2023-02-09 Aktiebolaget Skf Method for manufacturing a target holder for sensor bearing unit

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