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WO2013050801A1 - Unité de capteur et système de support comprenant cette unité de capteur - Google Patents

Unité de capteur et système de support comprenant cette unité de capteur Download PDF

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Publication number
WO2013050801A1
WO2013050801A1 PCT/IB2011/002824 IB2011002824W WO2013050801A1 WO 2013050801 A1 WO2013050801 A1 WO 2013050801A1 IB 2011002824 W IB2011002824 W IB 2011002824W WO 2013050801 A1 WO2013050801 A1 WO 2013050801A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor unit
connection
sensing cell
unit according
sensing
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.)
Ceased
Application number
PCT/IB2011/002824
Other languages
English (en)
Inventor
Vincent Sausset
Matthieu RIOTEAU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Priority to PCT/IB2011/002824 priority Critical patent/WO2013050801A1/fr
Publication of WO2013050801A1 publication Critical patent/WO2013050801A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • 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
    • G01D5/14—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 the magnitude of a current or voltage
    • G01D5/142—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 the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—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 the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • 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
    • 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 invention relates to a sensor unit for sensing the angular position of a rotating element with respect to a fixed element.
  • the invention also concerns a bearing assembly comprising such a sensor unit.
  • Bearing assemblies are generally equipped with a sensor unit for determining angular positions and rotation speeds.
  • a sensor unit for determining angular positions and rotation speeds.
  • sensor bodies of various diameters in which several identical sensing cells are mounted and connected.
  • each sensing cell needs at least three connections for transmitting data, receiving electrical power and being connected to the ground, the number of connections to perform when producing the sensor units is relatively important. As these connections are generally made by soldering, this makes the mounting operations relatively long and costly.
  • the aim of the invention is to provide a new sensor unit whose mounting is simpler and easier than in the prior art.
  • the invention concerns a sensor unit for sensing the angular position of a rotating element with respect to a fixed element, this sensor unit comprising a target fast in rotation with the rotating element, a given number of sensing cells arranged in a sensor body extending around the rotation axis of the rotating element, each sensing cell being connected to a connection device mounted in the body, the connection device being adapted to provide power supply, transmit the data sensed by the sensing cells and connect each sensing cell to the ground.
  • each sensing cell is connected to the connection device by conductive connection pins arranged within the body, and in that each connection pin has an elastically deformable plug portion adapted to make a pressing contact with the connection device and an elastically deformable socket portion adapted to make a pressing contact with a portion of a sensing cell.
  • each sensing cell is connected to the connection device by electrical contacts made by elastically deformable plug and socket portions which exert mechanical forces.
  • connection pins By using such connection pins, the electrical connections are made without welding or soldering. This makes the mounting of sensing cells in the sensor body easier and faster.
  • such a sensor unit may incorporate one or several of the following features:
  • Each sensing cell is connected to the connection device by a set of three connection pins.
  • Each sensing cell is equipped with a power supply connection tab, an output connection tab, and a ground connection tab.
  • connection device comprises, for each sensing cell, a set of three plug areas.
  • connection device The plug areas of the connection device are circular holes.
  • each connection pin has a shape adapted to expand into a plug area the connection device.
  • the diameter of the circular holes is inferior to the transversal dimension of the first plug portions.
  • each connection pin has a shape adapted to exert a mechanical pressure on a connection tab of a sensing cell.
  • connection tabs of the sensing cells have a thickness superior to the width of a slot of the socket portions.
  • connection device is an annular printed circuit board mounted in an internal volume of the body extending around the rotation axis of the rotating element.
  • connection pins are overmoulded within the annular body.
  • connection pins are mounted in the sensor body after its production.
  • the invention also concerns a bearing assembly comprising a bearing and a sensor unit as mentioned here-above.
  • FIG. 1 is a partially exploded perspective view of a bearing assembly according to the invention
  • figure 2 is a sectional view along plane II, of a portion of the bearing assembly of figure 1 ;
  • FIG. 3 is a view along arrow III on figure 1 , of a sensor unit according to the invention.
  • - figure 4 is a partially exploded perspective view of the sensor unit of figure 3
  • - figure 5 is a partially exploded perspective view of a sensor body and sensing cells belonging to the sensor unit of figures 3 and 4, oriented in a different direction;
  • figure 6 is a view along arrow VI on figure 5, of the sensor body of figure 5;
  • figure 7 is a side view of the sensor body of figure 6;
  • FIG. 8 is a view of a connection pin belonging the sensor unit of figures 3 to 7;
  • FIG. 9 is a perspective view of a sensing cell belonging to the sensor unit of figures 3 to 7;
  • FIG. 10 is an exploded perspective view of the sensing cell of figure 9.
  • the rolling bearing assembly A represented on figures 1 and 2 comprises a rolling bearing 2 including an outer ring 20, an inner ring 22 and balls 24.
  • bearing 2 may include other kinds of rolling elements, such as rollers or needles.
  • Assembly A further comprises a sensor unit 4 including a sensor body 40 made of plastic material and adapted to be fixed to outer ring 20 thanks to a fastening flange 6.
  • Sensor unit 4 also includes a coder element or target 42 fast in rotation with inner ring 22.
  • Axis X-X' denotes the rotation axis of inner ring 22 with respect to outer ring 20, and also the rotation axis of coder element 42 with respect to sensor body 40.
  • Sensor body 40 is adapted to sense the angular position of coder element 42 so as to determine the angular position and the rotation speed of inner ring 22 with respect to outer ring 20.
  • Sensor body 40 includes sensing cells 401 .
  • sensor unit 4 is equipped with five sensing cells 401 regularly distributed around the rotation axis X-X' of coder element 42.
  • Coder element 42 may be a multipole magnetized ring which produces magnetic field variations while rotating around axis X-X'. Such magnetic field variations are sensed by sensing cells 401 , which may be Hall-effect sensing cells.
  • Sensing cells 401 are arranged so as to radially face coder element 42 with respect to axis X-X'.
  • Sensor unit 4 comprises an electrical connection device which makes the electrical connection between sensing cells 401 and an output of sensor unit 4.
  • the output comprises a connector 405 and a connection cable 4053 for transmitting output signals, for example to a dashboard, and providing electrical power and connection to the ground.
  • connection device is a printed circuit board 403 which also includes signal processing means for processing electrical currents delivered by each of sensing cells 401 .
  • Signal processing means may generate sine and cosine output electrical signals representative of the rotation speed and the angular position of inner ring 22 with respect to outer ring 20.
  • Printed circuit board 403 provides electrical power to be delivered to each sensing cell 401 , and connects each sensing cell 401 to a ground which may be provided in the vehicle in which assembly A is mounted.
  • Each sensing cell 401 is removably mounted in a corresponding housing 407 of sensor body 40.
  • Each housing 407 is angularly offset by a 72° angle with respect to the adjacent housings.
  • sensor unit may comprise a number of sensing cells different from 5.
  • Each sensing cell 401 includes a support plate 4010 and an electronic sensing component 4012. Each sensing cell 401 further includes a ground connection tab 4014, a power supply connection tab 4016 and an output connection tab 4018 adapted to transmit, to printed circuit board 403, the electrical signals delivered by each sensing cell 401 . Tabs 4014, 4016 and 4018 are preferably overmoulded within support body 4010.
  • Sensor body 40 has an annular shape centered on axis X-X' and is hollow. Sensor body 40 comprises an outer peripheral wall 409 and an inner peripheral wall 41 1 . On a side of sensor body 40 opposed to rolling bearing 2, sensor body 40 comprises a radial wall 413 linking outer wall 409 to inner wall 41 1 . Walls 409, 41 1 and 413 define an annular interior volume V1 of sensor body 40.
  • Inner wall 41 1 radially faces target 42.
  • Housings 407 are arranged in ribs 415, which extend radially from inner wall 41 1 towards interior volume V1 of sensor body 40.
  • Sensing cells 401 are mounted in housings 407 by a translational motion parallel to axis X-X', as shown by arrow A1 .
  • Each housing 407 comprises a slot 4071 facing axis X-X' so as to receive electronic sensing components 4012 so that they radially face target 42.
  • Sensor body comprises, for each sensing cell 401 , a set of three connection pins
  • Connection pins 419 which connect printed circuit board 403 to a sensing cell 401 .
  • Connection pins 419 are housed within radial wall 413.
  • Connection pins 419 are made of a metallic conductive material such as steel, preferably from stamped metal sheets.
  • Connection pins 419 have a plate shape defining a plane P419.
  • connection pin 419 has a first end equipped with a plug portion 4190 adapted to be connected to printed circuit board 403 and, on an other end, a socket portion 4193 adapted to be connected to one of the connection tabs 4014, 4016 and 4018 of sensing cells 401 .
  • Plug portion 4190 shows a sensibly oval shape with a central longitudinal slot 4191 . This central slot 4191 allows plug portion 4190 to elastically deform under compression forces exerted in plane P419 perpendicularly to central slot 4191 .
  • Plug portions 4190 protrude from radial wall 4013 parallely to axis X-X', approximately midway between ribs 415 and outer wall 409.
  • the socket portion 4193 is adapted to be connected to one of the tabs of a sensing cell 401 and shows a rectangular shape with a central slot 4195, which separates socket portion 4193 into two opposed tabs 4197.
  • Central slot 4195 allows socket portion 4193 to elastically deform under forces exerted in plane P419 perpendicularly to slot 4195.
  • Socket portions 4193 protrude from a bottom 4073 of housings 407 parallely to axis X-X'. More precisely, three socket portions 4193 protrude from the bottom 4073 of each housing 407.
  • Connection pins 419 are preferably overmoulded within sensor body 40 using a method known from the one skilled in the art. As an alternative embodiment, mounting holes may be arranged in sensor body 40, so that connection pins 419 could be mounted in sensor body 40 as separate parts, after the production of sensor body 40.
  • connection pin 419 is overmoulded in sensor body 40 so that its plane P419 is parallel to axis X-X' and oriented sensibly radially with respect to axis X-X'.
  • the connection pins of each of set of pins corresponding to one sensing cell 401 are parallel to each other.
  • either printed circuit board 403 or sensing cell 401 can be mounted first in sensor body 40.
  • Printed circuit board 403 is mounted in internal volume V1 by a translational motion along axis X-X', as shown by arrow A2.
  • Printed circuit board 403 has a global annular shape showing an inner edge 4031 facing inner walls 41 1 , and slots 4033 made in edge 4031 for passing around ribs 415.
  • Printed circuit board 403 is connected to connection pins 419 thanks to five sets of circular holes 4035, each set corresponding to one sensing cell 401 .
  • holes 4035 which have a diameter D1 slightly inferior to the transversal dimension D2, perpendicularly to central slot 4191 , of plug portions 4190, exert a compression force on plug portions 4190.
  • plug portions 4190 induces elastic forces F1 , represented on figure 2, exerted perpendicularly to slots 4191 on holes 4035, and guarantees an electrical pressing contact between connection pins 419 and printed circuit board 403.
  • This mounting method permits to avoid long and costly welding or soldering operations.
  • connection pins 419, printed circuit board 403 and sensing cells 401 may be different.
  • printed circuit board 403 may comprise connection tabs similar to tabs 4014, 4016 and 4018 so as to be inserted in central slots 4195 of connection pins 419, which could be mounted in an inverted way with respect to the one described before.
  • cells 401 may comprise holes similar to holes 417 for receiving plug portions similar to plug portions 4190.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne une unité de capteur permettant de détecter la position angulaire d'un élément rotatif (22) par rapport à un élément fixe (20) comprenant une cible (42) en rotation rapide avec l'élément rotatif (22) et un nombre donné de cellules de détection (401) disposées dans un corps de capteur (40) s'étendant autour de l'axe de rotation de l'élément rotatif (22). Chaque cellule de détection (401) est connectée à un dispositif de connexion (403) monté dans le corps (40), le dispositif de connexion étant conçu pour fournir une alimentation électrique, transmettre les données détectées par les cellules de détection, et connecter chaque cellule de détection (401) à la terre. Chaque cellule de détection (401) est connectée au dispositif de connexion (403) par des broches de connexion conductrices (419) disposées dans le corps (40). Chaque broche de connexion (419) possède une partie fiche élastiquement déformable (4190) conçue pour réaliser un contact sous pression (F1) avec le dispositif de connexion (403), et une partie prise élastiquement déformable (4193) conçue pour réaliser un contact sous pression (F2) avec une partie d'une cellule de détection (401).
PCT/IB2011/002824 2011-10-03 2011-10-03 Unité de capteur et système de support comprenant cette unité de capteur Ceased WO2013050801A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2011/002824 WO2013050801A1 (fr) 2011-10-03 2011-10-03 Unité de capteur et système de support comprenant cette unité de capteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2011/002824 WO2013050801A1 (fr) 2011-10-03 2011-10-03 Unité de capteur et système de support comprenant cette unité de capteur

Publications (1)

Publication Number Publication Date
WO2013050801A1 true WO2013050801A1 (fr) 2013-04-11

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Country Status (1)

Country Link
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013213752A (ja) * 2012-04-03 2013-10-17 Hitachi Automotive Systems Steering Ltd トルクセンサ
WO2016112931A1 (fr) * 2015-01-17 2016-07-21 Audi Ag Système de roulement de roue d'une roue de véhicule
WO2016116149A1 (fr) * 2015-01-21 2016-07-28 Aktiebolaget Skf Unité de capteur, roulement instrumenté comprenant une telle unité de capteur, et véhicule automobile
WO2016124194A1 (fr) 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Élément de liaison annulaire permettant la liaison électrique et mécanique de modules électroniques, ensemble de module électronique destiné à être monté dans un espace de montage cylindrique et ensemble de palier à roulement
WO2016124192A1 (fr) 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Élément de liaison pour relier électriquement et mécaniquement des modules électroniques, ensemble de module électronique destiné à être intégré dans un espace cylindrique et ensemble de palier à roulement
DE102015202129A1 (de) * 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Elektronikmodulanordnung zum Einbau in einen zylindrischen Bauraum sowie Wälzlageranordnung
WO2016188556A1 (fr) 2015-05-22 2016-12-01 Aktiebolaget Skf Système de support d'arbre pour un moteur électrique, moteur électrique comprenant un tel système et procédé permettant d'assembler un tel système de support d'arbre

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001051883A1 (fr) * 2000-01-14 2001-07-19 Hr Textron, Inc. Capteur de position a effet hall a faibles couts et procede de fabrication de ce capteur
DE102004047991A1 (de) * 2003-10-02 2005-06-23 Aisan Kogyo K.K., Obu Rotationswinkelsensoren
EP1832964A2 (fr) * 2006-03-10 2007-09-12 Samsung Electro-Mechanics Co., Ltd. Appareil de saisie rotatif
WO2010143021A1 (fr) * 2009-06-12 2010-12-16 Aktiebolaget Skf Ensemble palier à roulement pourvu d’un capteur et procédé de fabrication d’un tel ensemble

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001051883A1 (fr) * 2000-01-14 2001-07-19 Hr Textron, Inc. Capteur de position a effet hall a faibles couts et procede de fabrication de ce capteur
DE102004047991A1 (de) * 2003-10-02 2005-06-23 Aisan Kogyo K.K., Obu Rotationswinkelsensoren
EP1832964A2 (fr) * 2006-03-10 2007-09-12 Samsung Electro-Mechanics Co., Ltd. Appareil de saisie rotatif
WO2010143021A1 (fr) * 2009-06-12 2010-12-16 Aktiebolaget Skf Ensemble palier à roulement pourvu d’un capteur et procédé de fabrication d’un tel ensemble

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013213752A (ja) * 2012-04-03 2013-10-17 Hitachi Automotive Systems Steering Ltd トルクセンサ
WO2016112931A1 (fr) * 2015-01-17 2016-07-21 Audi Ag Système de roulement de roue d'une roue de véhicule
WO2016116149A1 (fr) * 2015-01-21 2016-07-28 Aktiebolaget Skf Unité de capteur, roulement instrumenté comprenant une telle unité de capteur, et véhicule automobile
WO2016124194A1 (fr) 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Élément de liaison annulaire permettant la liaison électrique et mécanique de modules électroniques, ensemble de module électronique destiné à être monté dans un espace de montage cylindrique et ensemble de palier à roulement
WO2016124192A1 (fr) 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Élément de liaison pour relier électriquement et mécaniquement des modules électroniques, ensemble de module électronique destiné à être intégré dans un espace cylindrique et ensemble de palier à roulement
DE102015202127A1 (de) 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Verbindungselement zum elektrischen und mechanischen Verbinden von Elektronikmodulen, Elektronikmodulanordnung zum Einbau in einen zylindrischen Bauraum sowie Wälzlageranordnung
DE102015202129A1 (de) * 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Elektronikmodulanordnung zum Einbau in einen zylindrischen Bauraum sowie Wälzlageranordnung
DE102015202126A1 (de) 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Ringförmiges Verbindungselement zum elektrischen und mechanischen Verbinden von Elektronikmodulen, Elektronikmodulanordnung zum Einbau in einen zylindrischen Bauraum sowie Wälzlageranordnung
WO2016124193A1 (fr) * 2015-02-06 2016-08-11 Schaeffler Technologies AG & Co. KG Système de module électronique à monter dans un espace cylindrique et système de palier à roulement
US9972956B2 (en) 2015-02-06 2018-05-15 Schaeffler Technologies AG & Co. KG Connecting element having a recessed portion on top of one end and a recessed portion on bottom of the other end
WO2016188556A1 (fr) 2015-05-22 2016-12-01 Aktiebolaget Skf Système de support d'arbre pour un moteur électrique, moteur électrique comprenant un tel système et procédé permettant d'assembler un tel système de support d'arbre

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