WO2016116149A1 - Unité de capteur, roulement instrumenté comprenant une telle unité de capteur, et véhicule automobile - Google Patents

Unité de capteur, roulement instrumenté comprenant une telle unité de capteur, et véhicule automobile Download PDF

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Publication number
WO2016116149A1
WO2016116149A1 PCT/EP2015/051156 EP2015051156W WO2016116149A1 WO 2016116149 A1 WO2016116149 A1 WO 2016116149A1 EP 2015051156 W EP2015051156 W EP 2015051156W WO 2016116149 A1 WO2016116149 A1 WO 2016116149A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit board
printed circuit
sensing element
element holder
sensor unit
Prior art date
Application number
PCT/EP2015/051156
Other languages
English (en)
Inventor
Benoît Locher
Jérôme CARNAC
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/EP2015/051156 priority Critical patent/WO2016116149A1/fr
Publication of WO2016116149A1 publication Critical patent/WO2016116149A1/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
    • G01P1/00—Details of instruments
    • G01P1/02—Housings
    • G01P1/026—Housings for speed measuring devices, e.g. pulse generator
    • 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
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/02—Bearings or suspensions for moving parts
    • 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
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • 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

Definitions

  • the invention relates to a sensor unit for sensing an angular position or a rotation speed of a rotatable element with respect to a fixed element.
  • the invention also relates to an instrumented bearing comprising a rolling bearing and such a sensor unit, and to an automotive vehicle comprising such an instrumented bearing or such a sensor unit.
  • Instrumented bearings generally comprise some sensing elements mounted around a rotatable target ring.
  • the sensing elements are often mounted on a sensing element holder mounted on a printed circuit board which comprises some processing means for handling the signals delivered by the sensing elements.
  • the sensing element holder is generally glued, screwed or attached by snapping to the printed circuit board.
  • the aim of the invention is to provide a new sensor unit in which the attaching of the sensing element holder and the printed circuit board leaves more space on the printed circuit board for the integration of processing elements.
  • the invention concerns a sensor unit for sensing the angular position or the rotation speed of a rotatable element with respect to a fixed element, comprising several sensing elements for sensing the angular position or the rotation speed of the rotatable element, an annular sensing element holder on which the sensing elements are mounted and an annular printed circuit board for processing signals delivered by the sensing elements, on which the sensing element holder is mounted and to which the sensing elements are electrically connected.
  • This sensor unit is characterized in that one element amongst the printed circuit board and the sensing element holder comprises male mounting means adapted to cooperate in a bayonet type mounting with female mounting means provided on the other element amongst the printed circuit board and the sensing element holder, so that the printed circuit board and the sensing element holder are blocked with respect to each other in rotation and translation, and in that the male and female mounting means are respectively provided on radial edges of the printed circuit board and the sensing element holder.
  • the space that the sensing element holder takes up on the printed circuit board is relatively small and concentrated on an edge of the printed circuit board, which avoids the presence of large unusable surfaces on the printed circuit board.
  • such a sensor unit may incorporate one or several of the following features:
  • the male and female mounting means are provided on respective inner edges of the printed circuit board and the sensing element holder.
  • the sensor unit comprises at least one screw for blocking a relative rotation between the printed circuit board and the sensing element holder.
  • the male mounting means comprise at least two axially extending pins adapted to be inserted in corresponding slots forming the female mounting means.
  • the pins comprise radially extending tabs forming an axial stop for blocking the printed circuit board and the sensing element holder in relative axial translation.
  • the slots comprise a protruding portion adapted to exert a radial effort against the pins so as to block the printed circuit board and the sensing element holder in relative rotation when the printed circuit board and the sensing element holder are rotated with respect to each other, after the pins have been inserted in the slots.
  • the pins comprise a protruding portion which is inserted in a corresponding recess of the slots when the printed circuit board and the sensing element holder are rotated with respect to each other after the pins have been inserted in the slots.
  • One element amongst the printed circuit board and the sensing element holder comprises at least one protruding element adapted to be inserted in a corresponding recess of the other element amongst the printed circuit board and the sensing element holder when the printed circuit board and the sensing element holder are rotated with respect to each other after the pins have been inserted in the slots, so as to block the printed circuit board and the sensing element holder in relative rotation.
  • the male mounting means are provided on the sensing element holder while the female mounting means are provided on the printed circuit board.
  • the male mounting means are provided on the printed circuit board, while the female mounting means are provided on the sensing element holder.
  • the invention also concerns an instrumented bearing comprising a rolling bearing and a sensor unit as mentioned here-above.
  • the invention also concerns an automotive vehicle comprising at least one instrumented bearing as mentioned here-above or at least one sensor unit as mentioned here-above.
  • FIG. 1 is an exploded perspective view of a sensor unit according to the invention
  • figure 2 is a perspective view, at a larger scale, of a printed circuit board and a sensing element holder belonging to the sensor unit of figure 1 ;
  • figure 3 is an exploded perspective view, from a different angle, of the printed circuit board and the sensing element holder of figure 2;
  • figure 4 is a view similar to figure 3, from a different angle;
  • FIG. 5 is a view, at a large scale and from a different angle, of the detail V on figure 2;
  • FIG. 6 is an exploded perspective view of a portion of a printed circuit board and a sensing element holder belonging to a sensor unit according to a second embodiment of the invention.
  • a sensor unit 1 which comprises a printed circuit board 5, which includes processing elements for signals delivered by sensing elements 7 of the sensor unit 1 , is represented on figure 1 .
  • the sensing elements 7 are adapted to sense the angular position or the rotation speed of a target ring 9 of the sensor unit 1 .
  • the target 9 comprises a magnetized ring 91 which generates magnetic field variations when rotating with respect to the sensing elements 7 around a central rotation axis X-X' of the sensor unit 1 .
  • axial and radial are used in reference to axis X-X'.
  • An “axial surface” is a surface perpendicular to axis X-X', and a “radial surface” is a surface centered on axis X-X' and parallel to this axis.
  • the sensor unit 1 is mounted in an automotive vehicle, such as a truck, in order to detect the rotation angle between a steering knuckle and a kingpin.
  • the printed circuit board 5, the sensing elements 7 and the sensing element holder 1 1 are mounted in a cover 3 which is adapted to be screwed in a non-shown steering knuckle.
  • the target ring 9 is mounted on a rotatable pin 31 of the cover 3 thanks to an elastic ring 32 mounted on a washer 34. The target ring 9 is coupled in rotation to a non-shown kingpin.
  • the sensing elements 7 are mounted on a sensing element holder 1 1 of the sensor unit 1 , which is itself mounted on the printed circuit board 5.
  • the sensing element holder 1 1 comprises recesses 1 1 1 in which the sensing elements 7 are inserted.
  • the sensing elements 7 each comprise a sensing cell 71 and three connection pins 73 which pass through three holes provided next to each recess 1 1 1 and are plugged in three connection holes of the printed circuit board 5.
  • the sensing element holder 1 1 comprises male mounting means adapted to cooperate, in a bayonet type mounting, with female mounting means provided on the printed circuit board 5.
  • the male mounting means comprise two axially extending pins 1 13 which are aligned with an inner edge 1 15 of the sensing element holder 1 1 .
  • the female mounting means comprise slots 53 which are formed on an inner edge 52 of the printed circuit board 5. The fact that the male and female mounting means are provided on respective inner edges 1 15 and 52 of the sensing element holder 1 1 and the printed circuit board 5 permits to save space for integrating processing components on the printed circuit board 5.
  • the male and female mounting means may be provided on respective outer edges of the printed circuit board 5 and the sensing element holder 1 1 .
  • the pins 1 13 have radially extending tabs 1 13a which form an axial stop for blocking the printed circuit board 5 and the sensing element holder 1 1 in relative axial translation along axis X-X'. As shown on figure 2, the tabs 1 13a are adapted to lay against an annular surface 55 of printed circuit board 5. The tabs 1 13a are located on pins 1 13 so that tabs 1 13a are offset with respect to an axial surface 1 12 of sensing element holder 1 1 . The axial offset distance d between tabs 1 13a and axial surface 1 12 is equivalent to the axial thickness t5 of the printed circuit board 5, so that the printed circuit board 5 is axially blocked between the tab 1 13a and axial surface 1 12.
  • the slots 53 are designed so as to provide a first surface 53a, which is offset with respect to the inner edge 52 by a first distance L53a, and a second surface 53b, which is offset from the inner edge 52 by a second distance L53b which is inferior to the distance L53a.
  • Each second surface 53b forms a protruding portion with respect to the adjacent first surface 53a.
  • the first distance L53a is equivalent to the radial length of the tabs 1 13a and the pins 1 13.
  • the first surface 53a of the slots 53 therefore permits to insert the pins 1 13 in the slots 53 by a translation of the sensing element holder 1 1 with respect to the printed circuit board 5 along axis X-X', as represented by arrow A1 on figure 3.
  • the male and female mounting means are designed to obtain a bayonet type mounting.
  • a bayonet type mounting means that the printed circuit board 5 and the sensing element holder 1 1 are rotatable with respect to each other around axis X-X' by a predefined angle between a first position, in which the printed circuit board 5 and the holder 1 1 can be positioned against each other, and a second position, in which they are blocked in rotation and translation.
  • the sensing element holder 1 1 and the printed circuit board 5 are rotated with respect to each other by a predefined angle around axis X-X' so that the pins 1 13 move in the slots 53 until they radially face the second surface 53b, as represented by arrow A2 on figure 2.
  • the second distance L53b is slightly inferior to the radial thickness of the pins 1 13, so that the second surface 53b exerts a radial centripetal effort against the pins 1 13.
  • the distance difference between the first distance L53a and the second distance L53b is equivalent to the radial length L1 13a of the tabs 1 13a.
  • the printed circuit board 5 and the sensing element holder 1 1 comprise additional guiding and aligning means formed by axial tabs 121 provided on the sensing element holder 1 1 which are inserted in slots 61 of the printed circuit board 5.
  • the axial tabs 121 and the slots 61 are provided on the inner edges 1 15 and 52.
  • the sensor unit 1 comprises at least one screw 13 which provides a supplementary mean for blocking relative rotation between the printed circuit board 5 and the sensing element holder 1 1 .
  • the screw 13 is inserted into a hole 57 of the printed circuit board 5 and in a threaded bore 1 17 of the sensing element holder 1 1 once these two holes have been aligned by the relative rotation of items 5 and 1 1 , as represented by arrow A2.
  • the sensor unit 1 may comprise more than one screw
  • the sensor unit 1 comprise a protruding element 1 19 provided on the sensing element holder 1 1 , and adapted to be inserted in a corresponding hole 59 of the printed circuit board 5 when the printed circuit board 5 and the sensing element holder 1 1 are rotated with respect to each other after the pins 1 13 have been inserted in the slots 53.
  • the protruding element 1 19 may have a semi-spherical shape. Such a protruding element and corresponding recess 59 further block the printed circuit board 5 and the sensing element holder 1 1 in relative rotation around axis X-X'.
  • a second embodiment of the invention is represented on figure 6.
  • elements common to the first embodiment have the same reference and work in the same way.
  • the pins 1 13 comprise a protruding portion 1 13b adapted to be inserted in a corresponding recess 53c of the slots 53 when the printed circuit board 5 and the sensing element holder 1 1 are rotated with respect to each other after the pins 1 13 have been inserted in the slots 53.
  • the protruding portion 1 13b is formed by a semi-cylindrical rib extending parallel to axis X-X'. The cooperation of these protruding portions 1 13b and these corresponding recesses 53b provides a supplementary mean for blocking the relative rotation of the printed circuit board 5 and the sensing element holder 1 1 .
  • the protruding portion may be provided on a surface of the slots 53, and the corresponding recess may be provided on the tabs 1 13.
  • the male mounting means may be provided on the printed circuit board instead of being provided on the sensing element holder, and the female mounting means may be provided on the sensing element holder instead of being provided on the printed circuit board.
  • the sensor unit 1 may also be mounted in an instrumented bearing comprising a rolling bearing.
  • an instrumented bearing may be mounted in an automotive vehicle, such as a truck.

Landscapes

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

Abstract

L'invention concerne une unité de capteur (1) pour détecter la position angulaire ou la vitesse de rotation d'un élément rotatif par rapport à un élément fixe, qui comprend plusieurs éléments de détection (7) pour détecter la position angulaire ou la vitesse de rotation de l'élément rotatif, un support d'élément de détection annulaire (11) sur lequel les éléments de détection (7) sont montés, une carte de circuit imprimé annulaire (5) pour traiter des signaux délivrés par les éléments de détection (7), sur laquelle le support d'élément de détection (11) est monté, et à laquelle les éléments de détection (7) sont reliés électriquement. Un élément (11) entre la carte de circuit imprimé (5) et le support d'élément de détection (11) comprend un moyen de montage mâle (113) conçu pour coopérer dans un montage de type baïonnette avec un moyen de montage femelle (53) situé sur l'autre élément (5) entre la carte de circuit imprimé (5) et le support d'élément de détection (11), de telle sorte que la carte de circuit imprimé (5) et le support d'élément de détection (11) sont bloqués l'un par rapport à l'autre en rotation et en translation. Les moyens de montage mâle et femelle (113, 53) sont respectivement situés sur des bords radiaux (52, 117) de la carte de circuit imprimé (5) et du support d'élément de détection (11).
PCT/EP2015/051156 2015-01-21 2015-01-21 Unité de capteur, roulement instrumenté comprenant une telle unité de capteur, et véhicule automobile WO2016116149A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/051156 WO2016116149A1 (fr) 2015-01-21 2015-01-21 Unité de capteur, roulement instrumenté comprenant une telle unité de capteur, et véhicule automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/051156 WO2016116149A1 (fr) 2015-01-21 2015-01-21 Unité de capteur, roulement instrumenté comprenant une telle unité de capteur, et véhicule automobile

Publications (1)

Publication Number Publication Date
WO2016116149A1 true WO2016116149A1 (fr) 2016-07-28

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PCT/EP2015/051156 WO2016116149A1 (fr) 2015-01-21 2015-01-21 Unité de capteur, roulement instrumenté comprenant une telle unité de capteur, et véhicule automobile

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Country Link
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0547935A1 (fr) * 1991-12-06 1993-06-23 Valeo Systemes D'essuyage Dispositif de mesure de la position angulaire instantanée d'un rotor d'une machine électrodynamique
EP0786856A1 (fr) * 1996-01-24 1997-07-30 ebm Werke GmbH & Co. Dispositif de commutation pour moteur à courant continu sans balais
US20120068695A1 (en) * 2009-05-19 2012-03-22 Franck Landrieve Support member, rotation device comprising such a support and rolling bearing assembly including a detection device
WO2013050801A1 (fr) * 2011-10-03 2013-04-11 Aktiebolaget Skf Unité de capteur et système de support comprenant cette unité de capteur
US20140021944A1 (en) * 2012-06-13 2014-01-23 Aktiebolaget Skf Method for producing a sensor unit, sensor unit and instrumented bearing comprising such a sensor unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0547935A1 (fr) * 1991-12-06 1993-06-23 Valeo Systemes D'essuyage Dispositif de mesure de la position angulaire instantanée d'un rotor d'une machine électrodynamique
EP0786856A1 (fr) * 1996-01-24 1997-07-30 ebm Werke GmbH & Co. Dispositif de commutation pour moteur à courant continu sans balais
US20120068695A1 (en) * 2009-05-19 2012-03-22 Franck Landrieve Support member, rotation device comprising such a support and rolling bearing assembly including a detection device
WO2013050801A1 (fr) * 2011-10-03 2013-04-11 Aktiebolaget Skf Unité de capteur et système de support comprenant cette unité de capteur
US20140021944A1 (en) * 2012-06-13 2014-01-23 Aktiebolaget Skf Method for producing a sensor unit, sensor unit and instrumented bearing comprising such a sensor unit

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