EP2633280A2 - Codeur magnétique pour un ensemble capteur de position angulaire - Google Patents

Codeur magnétique pour un ensemble capteur de position angulaire

Info

Publication number
EP2633280A2
EP2633280A2 EP11776427.4A EP11776427A EP2633280A2 EP 2633280 A2 EP2633280 A2 EP 2633280A2 EP 11776427 A EP11776427 A EP 11776427A EP 2633280 A2 EP2633280 A2 EP 2633280A2
Authority
EP
European Patent Office
Prior art keywords
encoder
ring
angle sensor
axial
tubular body
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
EP11776427.4A
Other languages
German (de)
English (en)
Inventor
Henrik Antoni
Manfred Goll
Thomas Krohn
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.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
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 Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP2633280A2 publication Critical patent/EP2633280A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/104—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving permanent magnets

Definitions

  • the invention relates to a carrying sleeve for a
  • Encoder ring the encoder ring, a differential angle sensor and a method for producing a support sleeve for an encoder ring.
  • Electrically and / or electronically assisted steering systems detect the information about a steering command via a differential angle sensor and assist the steering of the vehicle based on the detected information via a control loop.
  • differential angle sensor is known for example from DE 602 00 499 T2.
  • the differential angle sensor comprises one emitting a defined magnetic field
  • the differential angle sensor measures a difference angle between two mutually rotatable shaft sections, which are both connected to each other via a torsion bar.
  • the encoder ring is arranged on the first Wellenab ⁇ cut while assigned to the second shaft portion that two encoder ring
  • Stator elements are arranged with each projecting fingers.
  • the stator elements each comprise a soft magnetic ring element.
  • Each ring element has, with respect to the first shaft, axially projecting trapezoidal fingers.
  • the fingers of the two stator elements engage with each other without contact.
  • Both stator elements are assigned together one or more magnetic field sensor elements.
  • the relative angle of rotation between the two Wellenab ⁇ sections is detected directly or indirectly. From the detected angle of rotation can be closed to the torque acting on the first shaft.
  • Encoder ring from a donor, such as a magnetic ring form and put on a support sleeve on a steering shaft.
  • a support sleeve on a radial collar on which the encoder can be attached.
  • the invention proposes to propose an axial rear side of the support ⁇ sleeve axially and form thereon the axial envelope radial collar.
  • the invention is based on the consideration that the buildin ⁇ account the encoder must be robust, since to verbes ⁇ -improving wear sleeve used
  • Direction difference angle sensor is generally used in safety-critical areas. In the steering of a vehicle, failure of the Diffe ⁇ rence angle sensor would result in or failure of the complete steering-support ⁇ produce a self-steering, which is unacceptable.
  • the differential angle ⁇ sensor stands for the differential angle ⁇ sensor and thus for the supporting sleeve comprehensive
  • Encoder ring only little space available.
  • the production costs of a new solution in particular in the field of motor vehicle technology, must not exceed the production costs of a known solution.
  • the invention is also based on the consideration that the attachment of the encoder to the known support sleeve of a ⁇ known encoder ring is suboptimal. Either the encoder, its attachment to the support sleeve and the known support sleeve overhang completely axially, but this requires a kos ⁇ ten intensive folding of the known support sleeve, or the encoder or its attachment to the support sleeve protrude axially from the support sleeve.
  • the invention allows the radial collar wrinkle kept ⁇ staltung ⁇ by the specified axial envelope, wherein neither the encoder nor its attachment to the support sleeve protrude axially over the support sleeve.
  • the invention therefore provides a carrying sleeve for a
  • the specified carrying sleeve comprises a tubular body with an axial front side and a back side opposite to the axial front side, an envelope at the axial rear side of the tube-shaped body ⁇ and a radial collar on the envelope.
  • the radial collar can be arbitrarily placed on the envelope without an above-mentioned folding of the tubular body, so that the specified support sleeve can be made cost ⁇ forth, which can be realized with the support sleeve, a space-saving encoder.
  • the radial collar is formed on one of the axial rear side opposite axial end of the envelope. In this way, the radial collar can be formed by simple and time-saving Umbie ⁇ conditions of an end portion of the envelope.
  • support sleeve comprises a projection formed on the axial front side of the tubular body attaching portion for attaching said tubular body to a shaft, wherein the radial Kra ⁇ gen is formed at a side facing the fastening region of the envelope.
  • the tubular body is a deep-drawn component.
  • the deep-drawn component can be manufactured, for example, from a metal sheet is time-saving, whereby the carrier sleeve can be particularly cost ferti ⁇ gen.
  • the invention also provides an encoder ring for a differential angle sensor.
  • the specified encoder ring comprises a specified carrying sleeve and a radial flange with the ver ⁇ -bound donor.
  • the specified encoder ring comprises a connecting element connecting the transmitter to the radial collar.
  • the connecting element is an injection molded part, which allows a production of the encoder ring in series production in a particularly favorable manner.
  • a tool in the circumferential direction angrei ⁇ fen to position the encoder.
  • the specified includes
  • Encoder ring a radial gap between the envelope and the encoder. Through the radial gap clearance between the envelope and the timer is introduced, which allows a certain To ⁇ leranz for an inner diameter of the encoder and thermal expansion of the tubular body without the timer is forced out of its position. Moreover, if the encoder extends circumferentially around the tubular body, the radial gap also prevents the transmitter from the tubular body due to excessive mechanical stress is blown up.
  • the encoder is a magnetic ring.
  • This configuration is particularly advantageous if the tubular body is made of a metal being ⁇ forms, which can cause the magnetic field lines of the magnetic ring.
  • the tubular body thus serves as a yoke for the magnetic circuit constructed by the magnetic ring, collects the field lines from the magnetic ring and thus enhances the magnetic effect.
  • the invention also provides a differential angle sensor comprising a specified encoder ring and a probe for detecting an angular position of the transmitter to the probe.
  • the invention also provides a method for manufacturing a support sleeve for an encoder ring of a differential angle sensor, comprising the steps of forming a tubular body having an axial front side and a rear side opposite the axial front side, turning over an axial end on the axial rear side of the tubular body and forming a radial collar comprises at the folded axial end.
  • Developments of the method may be method steps that realize the features of the specified support sleeve, the ange ⁇ given encoder ring or the differential angle sensor according to the dependent claims mutatis mutandis.
  • Fig. 1 shows a steering shaft with an exemplary differential angle sensor
  • Fig. 2 show a sectional view of the encoder ring from the Diffe ⁇ rence angle sensor in FIG. 1.
  • FIG. 1 shows a steering shaft 2 with a differential angle sensor 4 according to an example of the invention.
  • the illustrated steering shaft 2 can be used for example in a manner known to those skilled in a motor vehicle.
  • the steering shaft 2 comprises, in addition to the differential angle sensor 4, an input shaft 6 and an output shaft 8.
  • the two shafts 6, 8 are connected to one another via a torsion bar 10.
  • the torsion bar 10 converts a torque existing between the input shaft 6 and the output shaft 8 into an angular difference detected by the differential angle sensor 4.
  • the differential angle sensor 4 has an encoder ring 12 and a sensor 14. The still to be described
  • Encoder ring 12 indicates the angular position of the
  • Encoder ring 12 to the sensor-dependent measurement signal to the probe 14 from.
  • the sensor 14 detects the measurement signal.
  • the encoder ring 12 is rotatably ver ⁇ connected with the input shaft 6, while the sensor 14 via a frame sixteenth rotatably connected to the output shaft 8 is connected. From the detectable by the sensor 14 measurement signal thus the angular position of the input shaft 6 to the output shaft 8 and the known stiffness of the torsion bar 10, the torque between the input shaft 6 and the output shaft 8 be ⁇ true.
  • FIG. 2 shows a sectional view of the encoder ring 12 from the differential angle sensor 4 of FIG. 1.
  • the encoder ring 12 has a transmitter attached via a connecting element 18 to a tubular body.
  • the connecting element 18 is made of plastic.
  • the tubular body is designed as a deep-drawn sheet 20 and the encoder as a magnetic ring 22, so that the measuring signal is a magnetic field.
  • the deep-drawn sheet 20 can be mounted in the attachment zone 24 on or on the steering shaft.
  • the deep-drawn sheet 20 can be caulked on the steering shaft, where ⁇ at a punch presses the sheet material of the thermoforming sheet 20 ra ⁇ dial in prepared recesses on the steering shaft.
  • the deep-drawn sheet 20 can also be glued or laser-welded to the steering shaft.
  • the fastening zone 24 opposite end of the deep ⁇ drawing sheet 20 has an envelope 26 which is placed radially over the main body of the thermoforming sheet 20. Viewed from a bending edge 28 between the base body of the Tiefziehble ⁇ ches 20 and the envelope 26 of, the environmental strike 26 at the opposite end to a radial collar 30.
  • the magnetic ring 22 of the encoder ring 12 is connected together with the connecting element 18 with the radial collar 30 formschlüs ⁇ sig.
  • the connecting element 18 is preferential ⁇ molded onto the magnetic ring 22.
  • the connecting member 18 may be made resilient, to intercept different temperature-induced expansions of the magnetic ⁇ rings 9 and the thermoforming sheet twentieth
  • depressions 32 in the connecting element 18 By depressions 32 in the connecting element 18, a key surface in the connecting element 18 can be executed. On the walls of the recesses 32 may attack a tool to mount the encoder ring 12 in the correct position.
  • the attachment of the recesses 32 in the connecting element 18 is particularly advantageous since the material of the magnetic ⁇ rings is brittle 22 and a formation of recesses 32 in the material of the magnet ring 22 can lead 22 during assembly to damage of the magnetic ring.
  • the magnetic ring 22 is radially spaced from the envelope 26, so that between magnetic ring 22 and the envelope 26, a radial gap 34 is formed.
  • the radial gap 34 prevents thermal expansion of the thermoforming sheet 20, the magnetic ⁇ ring 22 from the deep-drawn sheet 20 blow up.
  • the radial gap 34 permits an exact positioning of the magnetic ⁇ rings 22 on the cover 26 in spite of manufacturing tolerances.
  • thermoforming sheet 20 is designed to be magnetically conductive, this may be due to its on the magnetic ring 22 the measuring 14 lying opposite position bundle the magnetic field emitted by the magnetic ring 22 and act as a yoke. In this way the erutzba ⁇ ren by the sensor 14 measuring signal is amplified and increased the robustness of the difference ⁇ angle sensor. 4 Furthermore, a specific Mag ⁇ netfeld with relatively less cost-intensive magnetic ⁇ material can be achieved, so that production costs can be saved.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne une douille de support pour un disque de codeur (12) notamment d'un capteur de position angulaire (4). La douille de support selon l'invention comporte un corps (20) tubulaire présentant une face avant axiale et une face arrière opposée à la face avant axiale, un bord rabattu (26) sur la face arrière axiale du corps (20) tubulaire et une colerette (30) radiale sur le bord rabattu (26).
EP11776427.4A 2010-10-29 2011-10-27 Codeur magnétique pour un ensemble capteur de position angulaire Ceased EP2633280A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010043157 2010-10-29
PCT/EP2011/068839 WO2012055955A2 (fr) 2010-10-29 2011-10-27 Codeur magnétique pour un ensemble capteur de position angulaire

Publications (1)

Publication Number Publication Date
EP2633280A2 true EP2633280A2 (fr) 2013-09-04

Family

ID=44897757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11776427.4A Ceased EP2633280A2 (fr) 2010-10-29 2011-10-27 Codeur magnétique pour un ensemble capteur de position angulaire

Country Status (3)

Country Link
EP (1) EP2633280A2 (fr)
DE (1) DE102011085290A1 (fr)
WO (1) WO2012055955A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016110774A1 (de) 2016-06-13 2017-12-14 Valeo Schalter Und Sensoren Gmbh Magneteinheit für eine Sensoreinrichtung eines Kraftfahrzeugs, Sensoreinrichtung mit einer Magneteinheit und Kraftfahrzeug mit einer Sensoreinrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821668B1 (fr) 2001-03-02 2003-05-02 Moving Magnet Tech Capteur de position, notamment destine a la detection de la torsion d'une colonne de direction
DE10121749B4 (de) * 2001-05-04 2004-01-29 Windhorst Beteiligungsgesellschaft Mbh Ringmagnet, insbesondere für Gebersysteme zur berührungslosen Abtastung durch Sensoren
DE102008047466A1 (de) 2008-09-17 2010-04-15 Valeo Schalter Und Sensoren Gmbh Magnetbaugruppe für eine Drehmoment- und/oder Drehwinkelsensoranordnung mit einem Magnetring und Herstellungsverfahren
US7757570B1 (en) * 2009-02-06 2010-07-20 Gm Global Technology Operations, Inc. Torque sensor with alignment system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012055955A2 *

Also Published As

Publication number Publication date
WO2012055955A2 (fr) 2012-05-03
WO2012055955A3 (fr) 2012-10-11
DE102011085290A1 (de) 2012-05-03

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