WO2009040345A1 - Dispositif de détection de rotation et roulement instrumenté doté d'un tel dispositif - Google Patents

Dispositif de détection de rotation et roulement instrumenté doté d'un tel dispositif Download PDF

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Publication number
WO2009040345A1
WO2009040345A1 PCT/EP2008/062696 EP2008062696W WO2009040345A1 WO 2009040345 A1 WO2009040345 A1 WO 2009040345A1 EP 2008062696 W EP2008062696 W EP 2008062696W WO 2009040345 A1 WO2009040345 A1 WO 2009040345A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
coder
revolving
fitted
pole
Prior art date
Application number
PCT/EP2008/062696
Other languages
English (en)
Inventor
Franck Landrieve
Sylvain Chaussat
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 EP08804612A priority Critical patent/EP2193341A1/fr
Publication of WO2009040345A1 publication Critical patent/WO2009040345A1/fr

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Classifications

    • 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
    • G01D5/25—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts
    • G01D5/251—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts one conductor or channel
    • G01D5/2515—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts one conductor or channel with magnetically controlled switches, e.g. by movement of a magnet

Definitions

  • the present invention relates to devices for detecting proximity or passage of a revolving element, making it possible to determine at least one rotation parameter of the revolving element.
  • the invention also relates to the applications of such devices to instrumented rolling bearings for measuring at least one rotation parameter of a wheel or a displacement parameter of a vehicle fitted with such a wheel.
  • devices for detecting rotation of a revolving element which comprise a multiple-pole magnetic coder ring fitted on the revolving element and associated with a non-revolving sensor assembly sensitive to the magnetic fields. The magnetic field variations resulting from the passage of the different poles of the coder ring in front of the fixed sensor assembly generate a signal, which can be interpreted to measure the parameters sought.
  • sensors can be used, but these do, however, present the drawback of requiring an electrical supply current.
  • sensors comprising a flexible plate commutator or switch (ILS), also called “Reed relay”.
  • ILS flexible plate commutator or switch
  • a flexible plate switch generally comprises a glass capsule inside which two flexible plates forming the switch are fitted. The two plates are prolonged outside the capsule where they form connecting terminals via which the switch is connected to an associated measuring circuit.
  • Such a flexible plate switch can be housed in a casing o f synthetic material or even embedded in synthetic resin in order to form a magnetism-sensitive sensor assembly able to react to the presence o f magnetic fields and to supply a signal when the field lines are oriented in a certain way.
  • This type of sensor presents certain advantages which make its use particularly interesting in certain applications. Indeed, its cost is relatively low and it consumes no electrical current for its operation, unlike the case with Hall-effect cells.
  • positions of the magnet and of the flexible plate switch are adapted so as to obtain an opening and closing control according to relative motion of the magnet in relation to the sensor.
  • This type of sensor is often used to detect the rotation o f a bicycle wheel or roller skates.
  • the flexible plate switch is then associated with a magnet fixed on the wheel. The switch opens and closes on each passage of the magnet, which makes it possible, by sensing pulses in a given time interval, to deduce therefrom the speed of rotation of the wheel and the distance travelled.
  • the object of the present invention is to resolve these difficulties and make it possible to use this type of sensor with conventional multiple-pole coder rings, even in the case where the latter have a multitude of poles of very small dimensions.
  • a device for detecting the rotation of a revolving element of the type comprises a multiple-pole magnetic coder ring, fitted on the revolving element and a non-revolving sensor assembly sensitive to the magnetic fields, fitted close to the coder ring.
  • the sensor assembly comprises a flexible plate switch linked by two terminals to connecting wires. Concentrator elements are positioned between said terminals and the coder ring.
  • each concentrator element comprises a detection portion positioned facing the poles of the coder ring and a transmission portion in contact with one of the terminals of the flexible plate switch.
  • Each detection portion advantageously extends, in the circumferential direction, over a length substantially less than or equal to the circumferential length of a pole of the coder ring.
  • the detection portions of the concentrator elements preferably present ends that are mutually facing each other and separated by a distance equal to the circumferential length of a pair of poles of the coder ring.
  • a screen of magnetic material is also positioned between the flexible plate switch and the multiple-pole coder ring.
  • the field lines that are capable of acting on the control of the flexible plate switch are exclusively those that originate from the poles facing detection portions of the concentrator elements.
  • the screen preferably extends, in the circumferential direction, over a length slightly greater than the circumferential length of a pole and less than the circumferential length of a pair of poles of the coder ring.
  • the detection portions are maintained separated from the facing surface of the coder ring, which defines an appropriate air gap. In some cases, however, it is difficult to maintain the sensor in such a precise separated position. It is then possible to provide on the coder ring a thin layer or a coating of amagnetic material. The detection portions are maintained in friction contact with this amagnetic layer that is integral to the coder ring, which also produces an appropriate air gap as previously.
  • the transmission portions are preferably elastic and the sensor assembly is pressed towards the coder ring.
  • the sensor assembly can be fitted with an air gap that is radial in relation to the coder ring or with an air gap that is axial in relation to the coder ring, depending on the applications.
  • Another aspect of the invention relates to an instrumented rolling bearing for measuring at least one rotation parameter of a wheel or a displacement parameter of a vehicle fitted with such a wheel.
  • a bearing comprises a revolving ring, a non-revolving ring and at least one row of revolving elements positioned between the revolving and non-revolving rings.
  • the bearing comprises a device as mentioned above, the coder ring being fitted on the revolving ring.
  • Figure 1 diagrammatically illustrates the main units of a detection device according to the invention, the flexible plate switch being represented in the closed position;
  • Figure 2 is a partial view identical to Figure 1 , showing the flexible plate switch in the open position;
  • Figure 3 is a view similar to Figure 1 of a second embodiment;
  • FIG 4 is a cross-sectional view of an instrumented bearing equipped with a detection device according to the invention.
  • a detection device according to the invention comprises a multiple-pole magnetic coder ring 1 fitted to rotate on a revolving element not shown in the figure and a non- revolving sensor assembly referenced 2 overall, fitted close to the periphery of the coder ring 1.
  • the coder ring 1 has a plurality of magnetic poles around its periphery, each of the north poles 3 (marked N in Figure 1 ) being paired with a south pole 4 (denoted S in Figure 1 ) so as to form a pair of poles NS, the pairs of poles following each other side by side around the entire periphery of the coder ring 1.
  • the sensor assembly 2 comprises a flexible plate switch 5 with an oblong glass bulb 6, inside which are fitted two flexible plates 7 capable of making an electrical contact depending on the orientation of the field lines of a magnetic field located nearby.
  • the two plates 7 are prolonged outside the glass bulb 6 in the form of connecting terminals 8 at each end of said bulb 6.
  • Connecting wires 9 are fixed, for example by soldering, to the terminals 8 and linked to connecting cables 10 capable of transmitting a signal to a measuring device not represented in the figure.
  • the flexible plate switch 5 which comprises the bulb 6, the two plates 7 and the connecting terminals 8 associated with the connecting wires 9, is fitted close to the periphery of the rotating multiple-pole ring 1 with two concentrator elements 1 1 interposed.
  • Each of the concentrator elements 1 1 comprises a detection portion 12 positioned facing the poles of the ring 1 and a transmission portion 13 linking the detection portion 12 to one of the terminals 8 of the flexible plate switch 5.
  • each transmission portion 13 is substantially radial in relation to the axis of rotation of the ring 1 and presents an extension section 13a which is in electrical contact with a terminal 8, to which it is fixed, for example by soldering.
  • the two detection portions 12 have a substantially cylindrical form which corresponds to the general cylindrical form of the revolving multiple-pole ring 1 .
  • An air gap is left between the two detection portions 12 and the external cylindrical surface facing the multiple-pole ring 1. The relative positioning of the flexible plate switch 5 and of the multiple-pole ring 1 is thus radial, the sensor assembly 2 being positioned radially outside the multiple-pole ring 1.
  • the two detection portions 12 present end edges 12a mutually facing each other and separated from each other by a distance roughly equal to the circumferential length of a pair of poles NS of the coder ring 1. Furthermore, each detection portion 12 extends, in the circumferential direction, over a length substantially equal to the circumferential length of an N or S pole of the coder ring 1. This length could also be slightly less than the length of one of the poles.
  • end edges 12a could be directed in opposite directions.
  • a screen 14 made o f magnetic material and positioned between the flexible plate switch 5 and the multiple-pole coder ring 1 and between the two facing ends 12a of the two detection portions 12.
  • the circumferential length of the screen 14 is slightly greater than the circumferential length of a pole of the coder ring 1 , as can be seen in Figure 2. However, it remains less than the circumferential length of a pair of poles so that the edges of the screen 14 remain separated from the end edges 12a facing two detection portions 12.
  • the assembly formed by the flexible plate switch 5 fitted with the connecting terminals 8 and connecting wires 9 and the two concentrator elements 1 1 and the screen 14, is included in a mass o f synthetic material 15 to ensure the spatial cohesion of the different elements of the sensor assembly 2 and which facilitates maintaining it in a precise position separated by an air gap mentioned above in relation to the multiple-pole ring 1 . All that appears outside the synthetic material are the surfaces of the detection portions 12 and o f the screen 14.
  • the field lines are in effect channelled towards the two terminals 8 by the two concentrator elements 1 1. More specifically, the detection portions 12 sense the magnetic field lines which are then channelled by the transmission portions 13 as far as the terminals 8 of the flexible plate switch 5.
  • the dimensions of the detection portions 12 are chosen so as to accommodate a maximum of magnetic field lines, which is the case in the example illustrated in Figures 1 and 2, when the circumferential length of the detection portions 12 is substantially equal to the circumferential length of the poles to be detected 3 or 4.
  • the concentrators 1 1 are produced in a magnetic material capable of channelling the magnetic field lines, for example a ferromagnetic material such as steel.
  • the sensor assembly 2 can easily be encapsulated in a casing that can also comprise the connecting arrangements not illustrated in the figures.
  • a casing that can also comprise the connecting arrangements not illustrated in the figures.
  • the screen 14 in magnetic material, for example steel.
  • This screen 14 in effect forms a magnetic shield and short-circuits the field lines in order for them not to disturb the operation of the flexible plate switch 5.
  • the screen 14 prevents the magnetic field lines originating from the poles remaining between the facing ends of the two detection portions 12 from influencing the flexible plate switch 5 and disturbing the detection.
  • each of the detection portions 12 is facing a north pole 3 and respectively a south pole 4.
  • a pair of north/south poles remains between the two end edges 12a facing the two detection portions 12.
  • the screen 14 is positioned straddling, facing this pair of poles.
  • the flexible plate switch 5 senses almost all the field lines originating from the two north and south poles facing which there are two detection portions 12. The flexible plate switch 5 is therefore in the closed position.
  • each of the detection portions 12 is positioned facing the junction zone between two north/south poles.
  • the flexible plate switch 5 is in the open position given that the detection portions 12 do not transmit to the flexible plate switch 5 field lines oriented so as to provoke the closure of the flexible plates 7.
  • the embodiment illustrated in Figure 3 differs essentially from the embodiment illustrated in Figures 1 and 2 by the fact that an additional ring 16, of small thickness, forming a layer of amagnetic material, is positioned around the multiple-pole coder ring 1 in order to define an air gap between the coder ring 1 and the sensor assembly 2.
  • Such a ring could be replaced by an amagnetic coating.
  • the two detection portions 12 here come into friction contact with the external cylindrical surface of the amagnetic ring 16.
  • transmission portions 13 instead of being substantially radial as in the embodiment of Figures 1 and 2, present an inclined V section with a branch 13 f fixed by an extension section 13a to a terminal 8 and a branch 13c extending the detection portion 12.
  • each transmission portion 13 an elastic character.
  • a bearing force exerted substantially radially to the sensor element 2 therefore makes it possible to elastically maintain the two detection portions 12 always in contact with the external periphery of the ring 16.
  • the thickness of the ring 16 forming the abovementioned amagnetic layer thus accurately defines the air gap which is maintained between the detection portions 12 and the multiple-pole ring 1.
  • Such an arrangement makes it possible to simplify the radial positioning of the sensor assembly 2 relative to the multiple-pole ring 1 by enhancing the accuracy of this positioning.
  • no screen 14 is illustrated in Figure 3 , it will be understood that such a screen can also be provided in this embodiment, the screen then being able to be incorporated in the synthetic material 15 , between the flexible plate switch 5 and the multiple-pole ring 1.
  • FIG. 4 illustrates an exemplary application of a detection device as illustrated in the preceding figures.
  • a multiple-pole coder ring 1 is fitted by an annular support element 17 on the revolving internal ring 18 of a ball bearing 9.
  • the element 17 comprises an annular portion 17a, fitted over the external cylindrical surface of the ring 18 and a radial end plate portion 17b with an annular fold 17c on which is fitted the multiple-pole ring 1.
  • the ball bearing 19 also comprises a non-revolving external ring 20 and a row of balls 21 fitted in a cage 22. On one side of the rolling bearing 19 there is fitted a lip seal 23. On the other side, there is positioned, around the multiple-pole ring 1 , an annular part 24 of synthetic material inside which is embedded the flexible plate switch
  • the annular part 24 is snap fitted inside the non-revolving ring 20 by an annular fold 25 which cooperates with a groove 26 formed in the bore of the ring 20.
  • a radial face 27 of the annular part 24 comes into contact with a front face of the ring 20. This makes it possible to accurately define the radial and axial positions of the detection portions 12 embedded in the part 24 relative to the multiple-pole ring 1 and therefore the remaining radial air gap.
  • the annular part 24 presents a radial end plate 28 ending in an annular fold 29 directed towards the ring 18 and with a small separation from it.
  • the part of the part 24 that includes the flexible plate switch 5 and the detection portions 12 forms, with the radial end plate 28 and the fold 29 a sort of cover enclosing the ring 1 and its annular support 17. This forms a sort of labyrinth seal for the bearing 19, on the side opposite to the lip seal 23. All of the assembly can, of course, be reversed, with a non-revolving internal ring and a revolving external ring.
  • the signals sent by the flexible plate switch 5 are transmitted by the connecting cable 10 to a processing device that is not represented.
  • the invention makes it possible to use flexible plate switches with multiple-pole coder rings comprising a plurality of poles of very small dimensions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention porte sur un dispositif de détection de rotation et sur un roulement instrumenté doté d'un tel dispositif. L'invention porte sur un dispositif destiné à détecter la rotation d'un élément tournant de type à anneau codeur magnétique à multiples pôles (1) adapté sur l'élément tournant, et sur un ensemble de détecteur non tournant (2) sensible aux champs magnétiques, adapté à proximité de l'anneau codeur. L'ensemble de détecteur (2) comporte un commutateur à plaque flexible (5) lié par deux bornes (8) à des câbles de connexion et des éléments de concentrateur (11) positionnés entre les bornes (8) et l'anneau codeur (1).
PCT/EP2008/062696 2007-09-24 2008-09-23 Dispositif de détection de rotation et roulement instrumenté doté d'un tel dispositif WO2009040345A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08804612A EP2193341A1 (fr) 2007-09-24 2008-09-23 Dispositif de détection de rotation et roulement instrumenté doté d'un tel dispositif

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0757787A FR2921481B1 (fr) 2007-09-24 2007-09-24 Dispositif de detection de rotation et palier instrumente equipe d'un tel dispositif
FR0757787 2007-09-24

Publications (1)

Publication Number Publication Date
WO2009040345A1 true WO2009040345A1 (fr) 2009-04-02

Family

ID=39467660

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/062696 WO2009040345A1 (fr) 2007-09-24 2008-09-23 Dispositif de détection de rotation et roulement instrumenté doté d'un tel dispositif

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EP (1) EP2193341A1 (fr)
FR (1) FR2921481B1 (fr)
WO (1) WO2009040345A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930798A1 (de) * 1988-09-14 1990-03-22 Yazaki Corp Gasmessgeraet
EP1079207A2 (fr) * 1999-08-27 2001-02-28 Breed Automotive Technology, Inc. Capteur de rotation magnétique
EP1408306A1 (fr) * 2001-06-19 2004-04-14 Matsushita Electric Industrial Co., Ltd. Capteur de position de type sans contact
EP1449729A1 (fr) * 2003-02-21 2004-08-25 ROBERT BOSCH GmbH Maítre cylindre de véhicule automobile avec dispositif de détection d'actionnement d'un système de freinage, en particulier de la position du piston

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10329978B4 (de) * 2003-06-26 2007-03-01 Hübner Elektromaschinen GmbH Elektronischer Umdrehungszähler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930798A1 (de) * 1988-09-14 1990-03-22 Yazaki Corp Gasmessgeraet
EP1079207A2 (fr) * 1999-08-27 2001-02-28 Breed Automotive Technology, Inc. Capteur de rotation magnétique
EP1408306A1 (fr) * 2001-06-19 2004-04-14 Matsushita Electric Industrial Co., Ltd. Capteur de position de type sans contact
EP1449729A1 (fr) * 2003-02-21 2004-08-25 ROBERT BOSCH GmbH Maítre cylindre de véhicule automobile avec dispositif de détection d'actionnement d'un système de freinage, en particulier de la position du piston

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2193341A1 *

Also Published As

Publication number Publication date
FR2921481A1 (fr) 2009-03-27
FR2921481B1 (fr) 2009-11-27
EP2193341A1 (fr) 2010-06-09

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