EP2100113A1 - Sensor arrangement for measuring a torque - Google Patents

Sensor arrangement for measuring a torque

Info

Publication number
EP2100113A1
EP2100113A1 EP07857299A EP07857299A EP2100113A1 EP 2100113 A1 EP2100113 A1 EP 2100113A1 EP 07857299 A EP07857299 A EP 07857299A EP 07857299 A EP07857299 A EP 07857299A EP 2100113 A1 EP2100113 A1 EP 2100113A1
Authority
EP
European Patent Office
Prior art keywords
stator
sensor arrangement
shaft
sensor
elements
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.)
Withdrawn
Application number
EP07857299A
Other languages
German (de)
French (fr)
Inventor
Markus Bastian
Manfred Goll
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 EP2100113A1 publication Critical patent/EP2100113A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
    • G01L5/221—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to steering wheels, e.g. for power assisted steering

Definitions

  • the invention relates to a sensor arrangement for measuring a torque acting on a shaft according to the preamble of claim 1 and to the use of the sensor arrangement as a torque and / or angle sensor in the steering of a motor vehicle.
  • Document WO 02/071019 A1 proposes a position sensor for measuring the torque of a steering column, which consists of a magnetic multipole encoder ring and a magnetic stator with two ferromagnetic wheels, comprising a plurality of intermeshing teeth.
  • the two ferromagnetic wheels are coupled with additional flux concentrators or collectors via an air gap, which supply the magnetic field to a magnetic field sensor element.
  • the relative positioning of the ferromagnetic wheels, which act as stator elements of the position sensor, to the flux concentrators has proven to be relatively difficult in meeting relatively high torque measurement accuracy requirements. Precise adjustment of an air gap between the stator element and flux concentrator is made more difficult by component and manufacturing tolerances.
  • the object of the invention is to propose a sensor arrangement for measuring a torque acting on a shaft with increased measuring precision, in particular by the air gap between stator element and flow sensor. Concentrator is set relatively accurately.
  • the object is achieved by the sensor arrangement according to claim 1.
  • the invention is based on the idea of increasing the measurement precision of the sensor arrangement in that the at least one flux concentrator is fastened to an at least partially elastic or flexible carrier element.
  • the magnetic encoder and the stator are each assigned directly or indirectly to the two shaft sections.
  • a flow concentrator is preferably understood to mean a collector or a collector plate.
  • the first and the second shaft portion are preferably connected to each other by means of a torsion bar or coupled directly or indirectly with each other and against each other rotatable.
  • the two shaft sections are each in the form of mounted on the shaft or on the torsion sleeves.
  • stator elements and the at least one flux concentrator are expediently formed at least partially from soft magnetic material.
  • the stator elements are particularly preferably penetrated at least partially by the magnetic field generated by the magnetic encoder.
  • one or both shaft portions are directly or indirectly rotatably mounted indirectly and the torque acting on the shaft causes relative rotation of the two shaft sections to each other, wherein the two coupled by means of the sensor arrangement part waves with the two shaft sections by welding and / or gluing and / or Pins and / or a spline fit and / or another type of connection are connected.
  • a magnetic field sensor element is understood to mean a magnetoelectric transducer element, preferably a Hall element or a magnetoresistive sensor element. Such a magnetic field sensor element has, in particular, an integrated, electronic signal processing circuit.
  • the magnetic encoder is expediently an encoder ring and in particular in one piece and designed so that both stator elements are assigned to it.
  • the sensor arrangement preferably has two or more magnetic encoders or encoder rings arranged side by side on the first shaft section.
  • the magnetic encoder is particularly preferably alternately magnetized or is a multipole encoder.
  • the stator elements preferably each comprise one, in particular with respect to the shaft sections, radially projecting ring.
  • each stator element is associated with a flux concentrator, which is attached to a carrier element, wherein the carrier element at least one centering device which is designed so that it can at least partially comprise the ring of the associated stator for precise, in particular substantially centered, alignment between the stator element and the carrier element.
  • the carrier element at least one centering device which is designed so that it can at least partially comprise the ring of the associated stator for precise, in particular substantially centered, alignment between the stator element and the carrier element.
  • the at least one carrier element is or is substantially fixedly connected to a housing or a housing part of the sensor arrangement.
  • the centering device is particularly preferably designed such that it at least partially surrounds the ring of the respectively associated stator element in such a way that centering device and ring can form or form an interference fit.
  • the at least one carrier element very particularly preferably has a spreading recess into which an expansion element is at least partially inserted, whereby at least one centering device of the carrier element is at least partially widened or expanded, whereby the ring and carrier element are each formed and arranged without contact are.
  • a centering device is also preferably understood a staple-like formation or a centering recess.
  • at least one centering device is designed as a slot-press fit and / or forceps-shaped rim and / or clamp.
  • the sensor arrangement has two flux concentrators or a flux concentrator jointly assigned to the stator elements. The one or both flow concentrators are in particular attached to one or a common carrier element.
  • the sensor arrangement expediently comprises two carrier elements which are firmly connected to the housing of the sensor arrangement, the carrier elements being aligned for this purpose in each case by means of the press fit of the ring of the stator element in the centering device of the carrier element.
  • the component and installation inaccuracies are essentially irrelevant.
  • each carrier element is so widened or expanded by at least one spreading element in a spreading recess of the support element, thereby setting a substantially defined and in particular with respect to both stator symmetrical and substantially clearance clear air gap between the respective stator and flux concentrator is, whereby a relatively high measurement accuracy of the sensor arrangement is set, which can be achieved at relatively low and therefore cost tolerance requirements on component and manufacturing quality.
  • the at least one carrier element is preferably designed as an elastic clamp with two fastening devices for attachment to a housing, at least one centering device and at least one spreading recess.
  • the expansion element is expediently designed as a spreading or round bolt or expanding wedge.
  • the spreading elements of a carrier element or both carrier elements are particularly preferably connected to each other and form a spreading module. In this way, an increased precision of the at least partial fitting of the spreading elements in the respective spreading recesses can be achieved, whereby the air gaps between stator elements and flux concentrators can be set even more uniformly and more precisely with regard to the symmetry, which allows an even higher measuring accuracy.
  • the possible interference fit between ring and centering recess is expediently canceled by at least one expansion element introduced at least partially into a spreading recess, whereby the ring and associated centering recess are designed and arranged without contact.
  • stator elements are connected to each other by means of a common connecting element, in particular of injection-molded plastic.
  • a common connecting element in particular of injection-molded plastic.
  • the ring and the fingers of a stator are each preferably at least partially formed of soft magnetic material, wherein the fingers are attached to the ring and aligned with respect to the shaft projecting axially of the ring and are particularly preferably formed substantially trapezoidal.
  • This training has proven to be particularly suitable for a relatively precise conduction of the magnetic field.
  • the magnetic encoder or encoder ring expediently has at least two encoder tracks.
  • the sensor arrangement accordingly has at least two magnetic field sensor elements, at least one first encoder track being assigned the stator with two stator elements and associated therewith at least one first magnetic field sensor element.
  • the at least second encoder track is assigned to at least one second magnetic field sensor element for measuring a relative angle of rotation between the two shaft sections. This is used in particular for detecting a steering angle.
  • the sensor arrangement preferably has a housing, on which the carrier elements are fastened and which, in particular for electromagnetic shielding, is formed at least partially from magnetically conductive material.
  • the housing has a cover of magnetically conductive steel.
  • At least one or two magnetic field sensor elements, wherein a first is in particular a Hall element for detecting the torque and the other is a magnetoresistive magnetic field element for detecting a relative angle of rotation between the two shaft sections are very particularly preferably arranged from the inside of the housing cover.
  • an evaluation circuit is arranged there, in particular, or the two magazines array sensor elements and the electronic circuit arranged on a common board or formed as an integrated circuit.
  • the magnetic encoder or encoder ring is integrally formed.
  • the magnetic encoder ring is designed such that it has at least two mutually offset by substantially 90 ° encoder tracks, more preferably at least one encoder track which is substantially parallel to the lateral surface of the shaft and at least one further encoder track is substantially perpendicular thereto.
  • the sensor arrangement expediently has at least one device with which the at least one carrier element is opened or spread by the spreading elements during assembly.
  • a sensor carrier made of plastic with a pickled steel part is used for shielding.
  • the sensor carrier is designed in particular as a carrier for the printed circuit board and has an integrated plug and / or an integrated cable.
  • the sensor carrier is particularly preferably suitable for pressing in the expansion elements during assembly and designed accordingly. It is preferred to form the sensor carrier from a combination of a fixed and a flexible printed circuit board.
  • Equal distances of the functional stator flux concentrator assemblies by self-centering via the flux concentrator assembly with the at least one support member by spreading mechanism.
  • Non-contact travel between flow concentrators and stator elements i.e., no further friction).
  • the flux concentrators can be positioned even more accurately when integrated into a housing. Easy installation of flow concentrator assembly and sensor assembly. Low number of necessary components. Good shielding of the magnetic field due to a closed steel housing.
  • the sensor arrangement is preferably designed as a pre-tested prefabricated module and thus allows the relatively simple connection to a steering gear.
  • the prior art often proposes essentially only active principles or the possible geometric design of associated individual functional components, but not their further development into a finished, separate, but in particular relatively easy to assemble, sensor arrangement.
  • the invention additionally relates to the use of a sensor arrangement according to the invention as a torque and / or Angle sensor in the steering of a motor vehicle.
  • a sensor arrangement according to the invention as a torque and / or Angle sensor in the steering of a motor vehicle.
  • an integration of this sensor arrangement is provided in a steering gear.
  • the sensor arrangement according to the invention is intended for use in automation technology as well as in machines and generators, thus also in motor vehicles for measuring a torque and optionally a rotation angle of a shaft. It is expediently provided for use in motor vehicles, in particular in steering systems.
  • the sensor arrangement according to the invention is intended for use in systems which have at least one shaft whose torque is to be detected.
  • an arrangement of the sensor arrangement is provided on a torsion element, which connects two shaft segments together.
  • Motor vehicles and systems of automation technology are particularly preferred as the field of application of the sensor arrangement.
  • the use is provided in the steering system of a motor vehicle.
  • Fig.l an exemplary stator
  • 2 shows an exemplary encoder
  • 3 shows an exemplary sensor arrangement with a magnetic encoder and a stator, each mounted on a shaft section
  • FIG. 4 shows an embodiment of a stator element and a carrier element
  • FIG. 9 shows an embodiment of a sensor arrangement with housing and an associated cover
  • FIG. 11 shows an exemplary embodiment of a sensor arrangement with the individual components to be assembled, which overall forms a relatively easy-to-manufacture overall system, and
  • Fig. 12 is an exemplary carrier element from a side view.
  • FIG. 1 shows an exemplary stator 4 with two stator Lements 5 and 6 shown, which includes a connecting element 21 made of plastic, by which the two stator elements 5, 6 are fixed.
  • Stator elements 5, 6 are, for example, ferromagnetic wheels with axially projecting fingers 7, which are integrally attached to a respective at least radially oriented ring 13, 14.
  • Stator elements 5, 6 are embedded by way of example as inserts in a molded plastic connecting element 21 with bush or sleeve 30.
  • the stator elements 5, 6 with the respective rings 13, 14 transmit or guide the magnetic field, which is generated by the magnetic encoder, not shown.
  • Fig. 2 shows an embodiment of a magnetic encoder 3, which is embedded by way of example as an insert in a plastic element by an injection molding and having a bushing or sleeve 31.
  • the magnetic encoder ring is integrally formed and has two encoder tracks 22 and 23, of which encoder track 22 is associated with the stator elements and thus the torque detection and encoder track 23 of the steering angle detection.
  • the exemplary encoder assembly is formed with respect to the sleeve 31 so that it is connectable to the input shaft.
  • FIG. 3 illustrates the embodiment of both shaft sections 1, 2 of an exemplary, preassembled sensor arrangement, wherein an input shaft, not shown, is assigned a connection with a universal joint 32 on the part of the magnetic encoder 3 or of the encoder module, and one not shown.
  • Output shaft is a connection with worm 33 or splined shaft of the stator 4 and the stator assembly is assigned. Rings 13 and 14 of the two stator elements of the stator 4 are also shown. Both shaft sections
  • Encoder 3 is exemplified as a component mounted on shaft portion or fixedly connected thereto.
  • carrier element 11 is illustrated with this associated stator element 5.
  • carrier element 11 is illustrated with this associated stator element 5.
  • Carrier element 11 comprises centering devices 15, 16, which are designed, for example, as elastic brackets. In this case, carrier element 11 has two fastening devices 34, 35 in the form of two holes for attachment to a housing. Furthermore, carrier element 5 has two centering devices 15, 16, which are of clip-shaped construction, and two spreading recesses 17 and 18. Ring 13 of stator element 5 is partially covered by centering devices 15 and 16, respectively. Since in the exemplary illustration no spreading elements are inserted in spreading recesses 17 and 18 and ring 13 and centering devices 15, 16 are formed as a press fit ring 13 is clamped in the centering devices 15 and 16.
  • FIG. 5 illustrates an exemplary sensor assembly including a housing 25. Through the upper opening stator 4 with rings 13, 14 can be seen and a part of the encoder 3, wherein the encoder track whose magnetic field mainly passes through the stator of stator 4 and is thereby covered. Housing 25 has holes 37 for attachment of support elements, not shown, to each of which a flux concentrator is attached.
  • carrier elements 11, 12 are fastened to housing 25 by means of screws 36.
  • carrier elements 11, 12 are aligned according to the example, as illustrated in FIG. 4, on the rings of the stator elements.
  • spreading elements 19, 20, which are associated with the spreading recesses 17, 18 of the support elements, inserted into these expansion recesses 17, 18, whereby the centering means, not shown, support members 11 and 12 are expanded or expanded.
  • a substantially defined air gap is formed between flow concentrators and stator elements, not shown, and between carrier elements 11, 12 and stator elements.
  • Spreading elements 19, 20 are formed as an expansion bolt and connected to a common expansion module 28, which can be relatively precisely inserted into the expansion recesses 17 and 18, for example.
  • the stator can thus rotate without contact in operation, or be rotationally deflected.
  • the spreading elements 19, 20 are optionally used as an example first in the expansion recesses 17, 18 and further pressed during the assembly of a cover, not shown here to a defined degree, whereby the centering devices are spread or expanded in a defined manner.
  • FIG. 7 shows an exemplary carrier element 11, which is designed as an injection molded part made of plastic and has a flux concentrator 8 or a collector plate as an insert part.
  • the flux concentrator 8 can be applied as a coating to the carrier element 11 or the plastic carrier.
  • centering devices 15 and 16 which are each formed as bracket parts, flow concentrator 8 is aligned or centered on the ring of the stator element, not shown.
  • first cover 26 is shown for the housing of the sensor assembly, not shown, wherein the inside of this cover can be seen.
  • the lid is designed in particular as a steel plate.
  • a printed circuit board 27 is fastened and locked in fastening means 38.
  • Circuit board 27 or board has two magnetic field sensor elements 10 and 24.
  • Magnetic field sensor element 10 serves for detecting the magnetic field concentrated by the flux concentrators and thus for indirectly detecting a torque as a whole.
  • Magnetic field sensor element 24 is integrated in an electronic evaluation circuit and is used to detect an additional, not shown, second encoder track used to measure a rotation angle.
  • Printed circuit board 27 is connected by means of press-in 39 with external, not shown, electrical connections of a connector of the housing.
  • cover 26 has indenting means 41, which are designed and provided for the insertion or insertion or fully provided insertion of the spreading elements, not shown in the spreading recesses of the support elements, not shown.
  • Fig. 9 illustrates an embodiment of the sensor assembly having a housing 25 in which lid 26, which acts as a sensor carrier, consists of plastic with an injected steel plate for shielding the magnetic field.
  • Cover 26 additionally comprises a forming geometry with which the spreading elements or bolts are pressed into the spreading recesses of the carrier elements during assembly, as a result of which the centering devices or clamps are spread.
  • Cover 26 has a plug 40 or housing plug 40, wherein in an embodiment, not shown, the sensor arrangement is connected directly by a cable.
  • Printed circuit board 27 consists of a combination of a fixed and a flexible printed circuit board, or of a pure flexible printed circuit board, and is thus also suitable for receiving sensors that are perpendicular to the circuit board. Depending on the circuit complexity, the design is possible as a MiD component of the cover or sensor carrier.
  • the housing and the lid are made of steel for EMC reasons or, alternatively, as an example of another magnetically formed conductive material.
  • a plastic housing with inserts for the screw and bearing mounts is provided.
  • the exemplary embodiment of the sensor arrangement shown in FIG. 10 forms or is a functionally integrated, housed torque-steering angle sensor system 25.
  • a possible direct output-side connection by means of a splined shaft 33 to a steering gear 42 is illustrated.
  • the sensor assembly or the entire torque-steering angle sensor system comprising housing 25 is exemplified approximately as large or bulky as a conventional hydraulic part of a steering assistance.
  • Fig. 11 shows an exemplary sensor assembly, as a pre-tested prefabricated assembly, which forms a relatively easy to assemble, self-contained sensor system, which is particularly suitable for installation in a steering system.
  • sleeve-shaped shaft sections 1, 2, for example by means of bolts are attached to both ends of a torsion bar 43. These are connected via a bearing 44 with housing 25 and connectable from the outside in each case with a further shaft end.
  • a first shaft section 1 carries an encoder module 3 or a magnetic encoder with two encoder tracks, which are arranged offset from each other by 90 °. This first shaft portion 1 is formed so that it can be connected to an input shaft, not shown.
  • Second shaft portion 2 carries a stator 4 and a stator assemblies and is formed so that it can be connected to an output shaft, not shown.
  • the Both shaft sections 1, 2 with their attachments and torsion bar 43 are enclosed by housing 25.
  • two flux concentrators 8, 9 are fitted with support elements 11, 12 or two collector assemblies, each consisting of an elastic clamp with a magnetic conductive collector plate.
  • each of these collector assemblies is assigned an expansion bolt element 19, 20 or an expansion module 28, which consists of expansion bolts connected to one another.
  • This Sp Dahlbolzenetti are fitted into the respective elastic clip or in spreading recesses of the support members 11, 12 and provide for a defined air gap between the respective flux concentrators and stator elements.
  • FIG. 12 shows an exemplary carrier element 11, comprising a centering device 15 and a spreading recess 17, wherein an exemplary embodiment of centering device 15 and spreading recess 17 as well as their interaction should be illustrated, in particular with a spreading element, not shown.
  • SpreizausEnglishung 17 is outlined in the interior by the dashed lines and has a or spatial expansion surface 45, which are formed obliquely. This spreading surface 45 is arranged on an inner surface of the centering device 15, which is designed to be elastic.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

Sensor arrangement for measuring a torque affecting a shaft, wherein the shaft has a first shaft section (1) and a second shaft section (2), and both these shaft sections can be rotated in opposite directions. At least one magnetic encoder (3) is arranged on the first shaft section (1), and a stator (4) is arranged on the second shaft section (2), wherein the stator has two stator elements (5, 6), each with protruding fingers (7), and a flow concentrator (8, 9) is assigned to each or both of the stator elements (5, 6). Said flow concentrator (8, 9) feeds the magnetic field to be sensed, generated by the magnetic encoder (3), directly or indirectly to at least one magnetic field sensor element (10), wherein the at least one flow concentrator (8, 9) is fixed to a support element (11, 12) which is of elastic construction at least in part, wherein the support element has a centering device.

Description

Sensoranordnung zur Messung eines DrehmomentsSensor arrangement for measuring a torque
Die Erfindung betrifft eine Sensoranordnung zur Messung eines an eine Welle angreifenden Drehmoments gemäß Oberbegriff von Anspruch 1 sowie die Verwendung der Sensoranordnung als Drehmoment- und/oder Winkelsensor in der Lenkung eines Kraftfahrzeugs .The invention relates to a sensor arrangement for measuring a torque acting on a shaft according to the preamble of claim 1 and to the use of the sensor arrangement as a torque and / or angle sensor in the steering of a motor vehicle.
Druckschrift WO 02/071019 Al schlägt einen Stellungsfühler zur Messung des Drehmoments einer Lenksäule vor, welcher aus einem magnetischen Multipol-Encoderring und einem magnetischen Stator mit zwei ferromagnetischen Rädern, umfassend eine Mehrzahl von ineinandergreifenden Zähnen, besteht. Dabei sind die beiden ferromagnetischen Räder mit zusätzlichen Fluss-Konzentratoren bzw. Kollektoren über einen Luftspalt- gekoppelt, welche das magnetische Feld einem Magnetfeldsensorelement zuführen. Die relative Positionierung der ferro- magnetischen Räder, welche als Statorelemente des Stellungsfühlers fungieren, zu den Fluss-Konzentratoren hat sich dabei als relativ schwierig bezüglich der Erfüllung relativ hoher Genauigkeitsanforderungen an die Drehmomentmessung erwiesen. Das präzise Einstellen eines Luftspalts zwischen Statorelement und Fluss-Konzentrator wird durch Bauteil- und Fertigungstoleranzen erschwert.Document WO 02/071019 A1 proposes a position sensor for measuring the torque of a steering column, which consists of a magnetic multipole encoder ring and a magnetic stator with two ferromagnetic wheels, comprising a plurality of intermeshing teeth. The two ferromagnetic wheels are coupled with additional flux concentrators or collectors via an air gap, which supply the magnetic field to a magnetic field sensor element. The relative positioning of the ferromagnetic wheels, which act as stator elements of the position sensor, to the flux concentrators has proven to be relatively difficult in meeting relatively high torque measurement accuracy requirements. Precise adjustment of an air gap between the stator element and flux concentrator is made more difficult by component and manufacturing tolerances.
Die Erfindung hat sich die Aufgabe gestellt eine Sensoranordnung zur Messung eines an eine Welle angreifenden Drehmoments mit erhöhter Messpräzision vorzuschlagen, indem insbesondere der Luftspalt zwischen Statorelement und Fluss- Konzentrator jeweils relativ genau eingestellt wird.The object of the invention is to propose a sensor arrangement for measuring a torque acting on a shaft with increased measuring precision, in particular by the air gap between stator element and flow sensor. Concentrator is set relatively accurately.
Die Aufgabe wird erfindungsgemäß gelöst durch die Sensoranordnung gemäß Anspruch 1.The object is achieved by the sensor arrangement according to claim 1.
Der Erfindung liegt der Gedanke zu Grunde, die Messpräzision der Sensoranordnung dadurch zu erhöhen, dass der mindestens eine Fluss-Konzentrator an einem zumindest teilweise elastischen bzw. flexiblen Trägerelement befestigt ist.The invention is based on the idea of increasing the measurement precision of the sensor arrangement in that the at least one flux concentrator is fastened to an at least partially elastic or flexible carrier element.
Der magnetische Encoder sowie der Stator sind jeweils direkt oder indirekt auf den beiden Wellenabschnitten abgeordnet.The magnetic encoder and the stator are each assigned directly or indirectly to the two shaft sections.
Unter einem Fluss-Konzentrator wird bevorzugt ein Kollektor bzw. ein Kollektorblech verstanden.A flow concentrator is preferably understood to mean a collector or a collector plate.
Der erste und der zweite Wellenabschnitt sind bevorzugt mittels eines Torsionsstabes miteinander verbunden bzw. direkt oder indirekt miteinander und gegeneinander verdrehbar gekoppelt .The first and the second shaft portion are preferably connected to each other by means of a torsion bar or coupled directly or indirectly with each other and against each other rotatable.
Vorzugsweise sind die beiden Wellenabschnitte jeweils in Form von auf der Welle oder auf dem Torsionselement befestigten Hülsen ausgebildet.Preferably, the two shaft sections are each in the form of mounted on the shaft or on the torsion sleeves.
Die Statorelemente und der zumindest eine Fluss-Konzentrator sind zweckmäßigerweise zumindest teilweise aus weichmagnetischem Material ausgebildet. Dabei werden die Statorelemente besonders bevorzugt zumindest teilweise durch das vom magnetischen Encoder erzeugte Magnetfeld durchdrungen. Vorzugsweise sind ein oder beide Wellenabschnitte direkt o- der indirekt drehbar gelagert und das an die Welle angreifende Drehmoment bewirkt eine relative Verdrehung der beiden Wellenabschnitte zueinander, wobei die beiden mittels der Sensoranordnung gekoppelten Teilwellen mit den beiden Wellenabschnitten durch Schweißen und/oder Kleben und/oder Ver- stiften und/oder eine Keilwellen-Passung und/oder eine andere Verbindungsart verbunden sind.The stator elements and the at least one flux concentrator are expediently formed at least partially from soft magnetic material. In this case, the stator elements are particularly preferably penetrated at least partially by the magnetic field generated by the magnetic encoder. Preferably, one or both shaft portions are directly or indirectly rotatably mounted indirectly and the torque acting on the shaft causes relative rotation of the two shaft sections to each other, wherein the two coupled by means of the sensor arrangement part waves with the two shaft sections by welding and / or gluing and / or Pins and / or a spline fit and / or another type of connection are connected.
Unter einem Magnetfeldsensorelement wird ein magnetoelektrisches Wandlerelement, vorzugsweise ein Hallelement oder ein magnetoresistives Sensorelement, verstanden. Solch ein Magnetfeldsensorelement weist insbesondere eine integrierte, elektronische Signalverarbeitungsschaltung auf.A magnetic field sensor element is understood to mean a magnetoelectric transducer element, preferably a Hall element or a magnetoresistive sensor element. Such a magnetic field sensor element has, in particular, an integrated, electronic signal processing circuit.
Der magnetische Encoder ist zweckmäßigerweise ein Encoderring und insbesondere einstückig und so ausgebildet, dass diesem beide Statorelemente zugeordnet sind. Alternativ vorzugsweise weist die Sensoranordnung zwei oder mehr auf dem ersten Wellenabschnitt nebeneinander angeordnete, magnetische Encoder bzw. Encoderringe auf. Der magnetische Encoder ist besonders bevorzugt alternierend magnetisiert bzw. ist ein Multipol-Encoder .The magnetic encoder is expediently an encoder ring and in particular in one piece and designed so that both stator elements are assigned to it. Alternatively, the sensor arrangement preferably has two or more magnetic encoders or encoder rings arranged side by side on the first shaft section. The magnetic encoder is particularly preferably alternately magnetized or is a multipole encoder.
Die Statorelemente umfassen bevorzugt jeweils einen, insbesondere bezüglich der Wellenabschnitte, radial abragenden Ring. Dabei ist jedem Statorelement ein Fluss-Konzentrator zugeordnet, welcher an einem Trägerelement befestigt ist, wobei das Trägerelement zumindest eine Zentrier-Einrichtung aufweist, welche so ausgebildet ist, dass sie den Ring des zugeordneten Statorelements zur präzisen, insbesondere im Wesentlichen zentrierten, Ausrichtung zwischen Statorelement und Trägerelement zumindest teilweise umfassen kann. Hierdurch kann insbesondere die relative Ausrichtung zwischen Statorelement und Trägerelement in Kombination mit der zumindest teilweise elastischen Ausbildung des Trägerelements durchgeführt werden. Das mindestens eine Trägerelement wird bzw. ist dabei im Wesentlichen fest mit einem Gehäuse bzw. einem Gehäuseteil der Sensoranordnung verbunden. Die Zent- rier-Einrichtung ist dabei besonders bevorzugt jeweils so ausgebildet, dass sie den Ring des jeweils zugeordneten Statorelements zumindest teilweise so umfasst, dass Zentrier- Einrichtung und Ring eine Presspassung bilden können oder bilden. Das mindestens eine Trägerelement weist ganz besonders bevorzugt eine Spreiz-Ausnehmung auf, in welche ein Spreizelement zumindest teilweise eingesetzt ist, wobei hierdurch wenigstens eine Zentrier-Einrichtung des Trägerelements zumindest teilweise geweitet bzw. aufgedehnt wird, wodurch Ring und Trägerelement jeweils berührungslos zueinander ausgebildet und angeordnet sind.The stator elements preferably each comprise one, in particular with respect to the shaft sections, radially projecting ring. In this case, each stator element is associated with a flux concentrator, which is attached to a carrier element, wherein the carrier element at least one centering device which is designed so that it can at least partially comprise the ring of the associated stator for precise, in particular substantially centered, alignment between the stator element and the carrier element. In this way, in particular the relative alignment between the stator element and the carrier element in combination with the at least partially elastic configuration of the carrier element can be performed. The at least one carrier element is or is substantially fixedly connected to a housing or a housing part of the sensor arrangement. The centering device is particularly preferably designed such that it at least partially surrounds the ring of the respectively associated stator element in such a way that centering device and ring can form or form an interference fit. The at least one carrier element very particularly preferably has a spreading recess into which an expansion element is at least partially inserted, whereby at least one centering device of the carrier element is at least partially widened or expanded, whereby the ring and carrier element are each formed and arranged without contact are.
Unter einer Zentrier-Einrichtung wird auch bevorzugt eine klammerartige Ausbildung oder eine Zentrier-Ausnehmung verstanden. Insbesondere ist zumindest eine Zentrier- Einrichtung als Schlitz-Presspassung und/oder zangenförmiger Kranz und/oder Klammer ausgebildet. Es ist zweckmäßig, dass die Sensoranordnung zwei Fluss- Konzentratoren oder einen den Statorelementen gemeinsam zugeordneten Fluss-Konzentrator aufweist. Der eine oder die beiden Fluss-Konzentratoren sind dabei insbesondere an jeweils einem oder einem gemeinsamen Trägerelement befestigt.Under a centering device is also preferably understood a staple-like formation or a centering recess. In particular, at least one centering device is designed as a slot-press fit and / or forceps-shaped rim and / or clamp. It is expedient that the sensor arrangement has two flux concentrators or a flux concentrator jointly assigned to the stator elements. The one or both flow concentrators are in particular attached to one or a common carrier element.
Die Sensoranordnung umfasst zweckmäßigerweise ganz besonders bevorzugt zwei Trägerelemente, welche mit dem Gehäuse der Sensoranordnung fest verbunden sind, wobei die Trägerelemente hierzu jeweils mittels der Presspassung des Rings des Statorelements in der Zentrier-Einrichtung des Trägerelements ausgerichtet sind. Bezüglich dieser relativen Ausrichtung zwischen jeweils einem Statorelement und einem Trägerelement sind die Bauteil- und Einbauungenauigkeiten im Wesentlichen irrelevant. Außerdem ist die Zentrier-Einrichtung jedes Trägerelements durch wenigstens ein Spreizelement in einer Spreiz-Ausnehmung des Trägerelements so geweitet bzw. aufgedehnt, dass hierdurch ein im Wesentlichen definierter und insbesondere bezüglich beider Statorelemente symmetrischer und im Wesentlichen spielfreier Luftspalt zwischen jeweiligem Statorelement und Fluss-Konzentrator eingestellt ist, wodurch eine relativ hohe Messgenauigkeit der Sensoranordnung eingestellt ist, welche bei relativ geringer und damit kostengünstigen Toleranzanforderungen an Bauteil- und Fertigungsqualität erreicht werden kann.The sensor arrangement expediently comprises two carrier elements which are firmly connected to the housing of the sensor arrangement, the carrier elements being aligned for this purpose in each case by means of the press fit of the ring of the stator element in the centering device of the carrier element. With regard to this relative alignment between in each case one stator element and one carrier element, the component and installation inaccuracies are essentially irrelevant. In addition, the centering device of each carrier element is so widened or expanded by at least one spreading element in a spreading recess of the support element, thereby setting a substantially defined and in particular with respect to both stator symmetrical and substantially clearance clear air gap between the respective stator and flux concentrator is, whereby a relatively high measurement accuracy of the sensor arrangement is set, which can be achieved at relatively low and therefore cost tolerance requirements on component and manufacturing quality.
Das mindestens eine Trägerelement ist bevorzugt als elastische Klammer mit zwei Befestigungsvorrichtungen zur Befestigung an einem Gehäuse, wenigstens einer Zentrier-Einrichtung und zumindest einer Spreiz-Ausnehmung ausgebildet. Das Spreizelement ist zweckmäßigerweise als Spreiz- bzw. Rundbolzen oder Spreizkeil ausgebildet. Die Spreizelemente eines Trägerelements oder beider Trägerelemente sind besonders bevorzugt miteinander verbunden und bilden ein Spreizmodul. Hierdurch kann eine gesteigerte Präzision der zumindest teilweisen Einpassung der Spreizelemente in die jeweiligen Spreiz-Ausnehmungen erreicht werden, wodurch die Luftspalte zwischen Statorelementen und Fluss-Konzentratoren noch gleichmäßiger und genauer hinsichtlich der Symmetrie eingestellt werden können, was eine noch höhere Messgenauigkeit ermöglicht.The at least one carrier element is preferably designed as an elastic clamp with two fastening devices for attachment to a housing, at least one centering device and at least one spreading recess. The expansion element is expediently designed as a spreading or round bolt or expanding wedge. The spreading elements of a carrier element or both carrier elements are particularly preferably connected to each other and form a spreading module. In this way, an increased precision of the at least partial fitting of the spreading elements in the respective spreading recesses can be achieved, whereby the air gaps between stator elements and flux concentrators can be set even more uniformly and more precisely with regard to the symmetry, which allows an even higher measuring accuracy.
Die mögliche Presspassung zwischen Ring und Zentrierausneh- mung ist zweckmäßigerweise durch wenigstens ein, zumindest teilweise in eine Spreiz-Ausnehmung eingeführtes Spreizelement aufgehoben, wodurch Ring und zugeordnete Zentrieraus- nehmung zueinander berührungslos ausgebildet und angeordnet sind.The possible interference fit between ring and centering recess is expediently canceled by at least one expansion element introduced at least partially into a spreading recess, whereby the ring and associated centering recess are designed and arranged without contact.
Es ist bevorzugt, dass die Statorelemente mittels eines gemeinsamen Verbindungselements, insbesondere aus gespritztem Kunststoff, miteinander verbunden sind. Hierdurch ist die relative Ausrichtung der beiden Statorelemente zueinander relativ präzise und fest eingestellt.It is preferred that the stator elements are connected to each other by means of a common connecting element, in particular of injection-molded plastic. As a result, the relative orientation of the two stator elements relative to each other is set relatively precisely and firmly.
Der Ring und die Finger eines Statorelements sind jeweils vorzugsweise zumindest teilweise aus weichmagnetischem Material ausgebildet, wobei die Finger am Ring befestigt sind und bezüglich der Welle axial von Ring abragend ausgerichtet und besonders bevorzugt im Wesentlichen trapezförmig ausgebildet sind. Diese Ausbildung hat sich als besonders geeignet für eine relativ präzise Leitung des magnetischen Felds erwiesen .The ring and the fingers of a stator are each preferably at least partially formed of soft magnetic material, wherein the fingers are attached to the ring and aligned with respect to the shaft projecting axially of the ring and are particularly preferably formed substantially trapezoidal. This training has proven to be particularly suitable for a relatively precise conduction of the magnetic field.
Der magnetische Encoder bzw. Encoderring weist zweckmäßigerweise mindestens zwei Encoderspuren auf. Die Sensoranordnung weist dabei entsprechend mindestens zwei Magnetfeldsensorelemente auf, wobei wenigstens einer ersten Encoderspur der Stator mit beiden Statorelementen zugeordnet und diesem mindestens ein erstes Magnetfeldsensorelement zugeordnet ist. Die mindestens zweite Encoderspur ist dabei zumindest einem zweiten Magnetfeldsensorelement zur Messung eines relativen Verdrehwinkels zwischen den beiden Wellenabschnitten zugeordnet. Dieser dient insbesondere zur Erfassung eines Lenkwinkels .The magnetic encoder or encoder ring expediently has at least two encoder tracks. In this case, the sensor arrangement accordingly has at least two magnetic field sensor elements, at least one first encoder track being assigned the stator with two stator elements and associated therewith at least one first magnetic field sensor element. The at least second encoder track is assigned to at least one second magnetic field sensor element for measuring a relative angle of rotation between the two shaft sections. This is used in particular for detecting a steering angle.
Die Sensoranordnung weist vorzugsweise ein Gehäuse auf, an welchem die Trägerelemente befestigt sind und welches insbesondere zur elektromagnetischen Abschirmung zumindest teilweise aus magnetisch leitfähigem Material ausgebildet ist. Besonders bevorzugt weist das Gehäuse einen Deckel aus magnetisch leitfähigem Stahl auf. Wenigstens eines oder zwei Magnetfeldsensorelemente, wobei ein erstes insbesondere ein Hallelement zur Erfassung des Drehmoments ist und das andere ein magnetoresistives Magnetfeldelement zur Erfassung eines relativen Verdrehwinkels zwischen den beiden Wellenabschnitten ist, sind ganz besonders bevorzugt aus der Innenseite des Gehäusedeckels angeordnet. Zusätzlich ist dort insbesondere eine Auswerteschaltung angeordnet bzw. die beiden Mag- netfeldsensorelemente sowie die elektronische Schaltung auf einer gemeinsamen Platine angeordnet oder als integrierte Schaltung ausgebildet.The sensor arrangement preferably has a housing, on which the carrier elements are fastened and which, in particular for electromagnetic shielding, is formed at least partially from magnetically conductive material. Particularly preferably, the housing has a cover of magnetically conductive steel. At least one or two magnetic field sensor elements, wherein a first is in particular a Hall element for detecting the torque and the other is a magnetoresistive magnetic field element for detecting a relative angle of rotation between the two shaft sections are very particularly preferably arranged from the inside of the housing cover. In addition, an evaluation circuit is arranged there, in particular, or the two magazines array sensor elements and the electronic circuit arranged on a common board or formed as an integrated circuit.
Es ist zweckmäßig, dass der magnetische Encoder bzw. Encoderring einstückig ausgebildet ist. Insbesondere ist der magnetische Encoderring so ausgebildet, dass er mindestens zwei zueinander um im Wesentlichen 90° versetzte Encoderspuren aufweist, besonders bevorzugt mindestens eine Encoderspur welche im Wesentlichen parallel zur Mantelfläche der Welle verläuft und mindestens eine weitere Encoderspur im Wesentlichen senkrecht dazu verläuft.It is expedient that the magnetic encoder or encoder ring is integrally formed. In particular, the magnetic encoder ring is designed such that it has at least two mutually offset by substantially 90 ° encoder tracks, more preferably at least one encoder track which is substantially parallel to the lateral surface of the shaft and at least one further encoder track is substantially perpendicular thereto.
Es ist bevorzugt, oben aufgeführte Ausführungsformen mit einander zu kombinierten und insbesondere zu einem in sich abgeschlossenen System zu ergänzen. Die Sensoranordnung ist dabei zweckmäßigerweise modular aufgebaut.It is preferable to combine the above-mentioned embodiments with each other and in particular to complete a self-contained system. The sensor arrangement is expediently modular.
Die Sensoranordnung weist zweckmäßigerweise zumindest eine Vorrichtung auf, mit welcher das wenigstens ein Trägerelement durch die Spreizelemente während der Montage geöffnet bzw. gespreizt wird.The sensor arrangement expediently has at least one device with which the at least one carrier element is opened or spread by the spreading elements during assembly.
Vorzugsweise wird ein Sensorträger aus Kunststoff mit eingelegtem Stahlteil zur Abschirmung verwendet. Der Sensorträger ist insbesondere als Träger für die Leiterplatte ausgebildet und weist einen integrierten Stecker und/oder ein integriertes Kabel auf. Der Sensorträger ist besonders bevorzugt zum Einpressen der Spreizelemente bei der Montage geeignet und entsprechend ausgebildet. Es ist bevorzugt den Sensorträger aus einer Kombination einer festen und einer flexiblen Leiterplatte auszubilden.Preferably, a sensor carrier made of plastic with a pickled steel part is used for shielding. The sensor carrier is designed in particular as a carrier for the printed circuit board and has an integrated plug and / or an integrated cable. The sensor carrier is particularly preferably suitable for pressing in the expansion elements during assembly and designed accordingly. It is preferred to form the sensor carrier from a combination of a fixed and a flexible printed circuit board.
Die vorgeschlagenen Ausführungsformen und Module weisen teilweise folgende Vorteile auf:The proposed embodiments and modules have in part the following advantages:
Gleiche Abstände der funktionalen Stator- Fluss- Konzentratorbaugruppen durch Selbstzentrierung über die Fluss-Konzentratorbaugruppe mit dem wenigstens einen Trägerelement durch Spreizmechanismus. Berührungsloser Lauf zwischen Fluss-Konzentratoren und Statorelementen (d.h. keine weitere Reibung) . Die Fluss-Konzentratoren lassen sich bei einer Integration in ein Gehäuse noch genauer positionieren. Einfache Montage der Fluss-Konzentratorbaugruppe und Sensorbaugruppe. Geringe Anzahl der notwendigen Bauteile. Gute Abschirmung des Magnetischen Feldes durch ein abgeschlossenes Stahlgehäuse .Equal distances of the functional stator flux concentrator assemblies by self-centering via the flux concentrator assembly with the at least one support member by spreading mechanism. Non-contact travel between flow concentrators and stator elements (i.e., no further friction). The flux concentrators can be positioned even more accurately when integrated into a housing. Easy installation of flow concentrator assembly and sensor assembly. Low number of necessary components. Good shielding of the magnetic field due to a closed steel housing.
Die Sensoranordnung ist bevorzugt als vorgeprüfte Fertigbaugruppe ausgebildet und ermöglicht so den relativ einfachen Anschluss an ein Lenkgetriebe. Der Stand der Technik schlägt häufig im Wesentlichen nur Wirkprinzipien bzw. die mögliche geometrische Gestaltung zugehöriger einzelner Funktionsbauteile vor, jedoch nicht deren Weitergestaltung zu einer fertigen, separaten, dabei jedoch insbesondere in relativ einfacher Weise zusammensetzbaren, Sensoranordnung.The sensor arrangement is preferably designed as a pre-tested prefabricated module and thus allows the relatively simple connection to a steering gear. The prior art often proposes essentially only active principles or the possible geometric design of associated individual functional components, but not their further development into a finished, separate, but in particular relatively easy to assemble, sensor arrangement.
Die Erfindung betrifft zusätzlich die Verwendung einer erfindungsgemäßen Sensoranordnung als Drehmoment- und/oder Winkelsensor in der Lenkung eines Kraftfahrzeuges. Insbesondere ist dabei eine Integration dieser Sensoranordnung in ein Lenkgetriebe vorgesehen.The invention additionally relates to the use of a sensor arrangement according to the invention as a torque and / or Angle sensor in the steering of a motor vehicle. In particular, an integration of this sensor arrangement is provided in a steering gear.
Die erfindungsgemäße Sensoranordnung ist zur Verwendung in der Automatisierungstechnik sowie in Maschinen und Generatoren, also auch in Kraftfahrzeugen zur Messung eines Drehmoment und optional eines Drehwinkels einer Welle vorgesehen. Dabei ist zweckmäßigerweise eine Verwendung in Kraftfahrzeugen vorgesehen, insbesondere in Lenkungssystemen. Die erfindungsgemäße Sensoranordnung ist zur Verwendung in Systemen vorgesehen, welche mindestens eine Welle aufweisen, deren Drehmoment erfasst werden soll. Dabei ist insbesondere eine Anordnung der Sensoranordnung auf einem Torsionselement vorgesehen, welches zwei Wellensegmente miteinander verbindet. Als Einsatzbereich der Sensoranordnung werden besonders bevorzugt Kraftfahrzeuge und Systeme der Automatisierungstechnik vorgeschlagen. Besonders bevorzugt ist die Verwendung in dem Lenkungssystem eines Kraftfahrzeugs vorgesehen.The sensor arrangement according to the invention is intended for use in automation technology as well as in machines and generators, thus also in motor vehicles for measuring a torque and optionally a rotation angle of a shaft. It is expediently provided for use in motor vehicles, in particular in steering systems. The sensor arrangement according to the invention is intended for use in systems which have at least one shaft whose torque is to be detected. In particular, an arrangement of the sensor arrangement is provided on a torsion element, which connects two shaft segments together. Motor vehicles and systems of automation technology are particularly preferred as the field of application of the sensor arrangement. Particularly preferably, the use is provided in the steering system of a motor vehicle.
Weitere bevorzugte Ausführungsformen ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung von Ausführungsbeispielen an Hand von Figuren.Further preferred embodiments will become apparent from the subclaims and the following description of exemplary embodiments with reference to figures.
Es zeigen in schematischer, beispielgemäßer DarstellungThey show in a schematic, exemplary illustration
Fig.l einen beispielhaften Stator,Fig.l an exemplary stator,
Fig. 2 einen beispielgemäßen Encoder, Fig. 3 eine beispielhafte Sensoranordnung mit einem magnetischem Encoder und einem Stator, jeweils auf einem Wellenabschnitt befestigt,2 shows an exemplary encoder, 3 shows an exemplary sensor arrangement with a magnetic encoder and a stator, each mounted on a shaft section,
Fig. 4 ein Ausführungsbeispiel eines Statorelements und eines Trägerelements,4 shows an embodiment of a stator element and a carrier element,
Fig. 5, 6 beispielhafte Sensoranordnungen mit Gehäuse,5, 6 exemplary sensor arrangements with housing,
Fig. 7 ein Ausführungsbeispiel eines Fluss-Konzentrators mit Trägerelement,7 shows an embodiment of a flux concentrator with carrier element,
Fig. 8 einen beispielhaften Gehäusedeckel mit Sensorplatine,8 shows an exemplary housing cover with sensor board,
Fig. 9 ein Ausführungsbeispiel einer Sensoranordnung mit Gehäuse und einem zugeordneten Deckel,9 shows an embodiment of a sensor arrangement with housing and an associated cover,
Fig. 10 die beispielhafte Ankopplung einer beispielhaften Sensoranordnung an ein Lenkgetriebe,10 shows the exemplary coupling of an exemplary sensor arrangement to a steering gear,
Fig. 11 ein Ausführungsbeispiel einer Sensoranordnung mit den zusammenzusetzenden Einzelbauteilen, welche insgesamt ein relativ leicht zu fertigendes Gesamtsystem bildet, und11 shows an exemplary embodiment of a sensor arrangement with the individual components to be assembled, which overall forms a relatively easy-to-manufacture overall system, and
Fig. 12 ein beispielhaftes Trägerelement aus einer Seitenansicht .Fig. 12 is an exemplary carrier element from a side view.
In Fig. 1 ist ein beispielhafter Stator 4 mit zwei Statore- lementen 5 und 6 abgebildet, welcher ein Verbindungselement 21 aus Kunststoff beinhaltet, durch welches die beiden Statorelemente 5, 6 fixiert werden. Statorelemente 5, 6 sind beispielgemäß ferromagnetische Räder mit axial abragenden Fingern 7, die an jeweils einem zumindest auch radial ausgerichteten Ring 13, 14 einstückig befestigt sind. Statorelemente 5, 6 sind beispielhaft als Einlegeteile in einem gespritzten KunststoffVerbindungselement 21 mit Buchse bzw. Hülse 30 eingebettet. Die Statorelemente 5, 6 mit den jeweiligen Ringen 13, 14 übertragen bzw. leiten das magnetische Feld, welches durch den nicht dargestellten magnetischen Encoder erzeugt wird.FIG. 1 shows an exemplary stator 4 with two stator Lements 5 and 6 shown, which includes a connecting element 21 made of plastic, by which the two stator elements 5, 6 are fixed. Stator elements 5, 6 are, for example, ferromagnetic wheels with axially projecting fingers 7, which are integrally attached to a respective at least radially oriented ring 13, 14. Stator elements 5, 6 are embedded by way of example as inserts in a molded plastic connecting element 21 with bush or sleeve 30. The stator elements 5, 6 with the respective rings 13, 14 transmit or guide the magnetic field, which is generated by the magnetic encoder, not shown.
Fig. 2 zeigt ein Ausführungsbeispiel eines magnetischen Encoders 3, welcher beispielgemäß als Einlegeteil in einem Kunststoffelement durch einen Spritzgießvorgang eingebettet ist und der eine Buchse bzw. Hülse 31 aufweist. Der magnetische Encoderring ist dabei einstückig ausgebildet und weist zwei Encoderspuren 22 und 23 auf, von denen Encoderspur 22 den Statorelementen und damit der Drehmomenterfassung und Encoderspur 23 der Lenkwinkelerfassung zugeordnet ist. Die beispielgemäße Encoderbaugruppe ist bezüglich der Hülse 31 so ausgebildet, dass sie mit der Eingangswelle verbindbar ist .Fig. 2 shows an embodiment of a magnetic encoder 3, which is embedded by way of example as an insert in a plastic element by an injection molding and having a bushing or sleeve 31. The magnetic encoder ring is integrally formed and has two encoder tracks 22 and 23, of which encoder track 22 is associated with the stator elements and thus the torque detection and encoder track 23 of the steering angle detection. The exemplary encoder assembly is formed with respect to the sleeve 31 so that it is connectable to the input shaft.
Fig. 3 veranschaulicht die Ausbildung beider Wellenabschnitte 1, 2 einer beispielhaften, vormontierten Sensoranordnung, wobei einer nicht dargestellten Eingangswelle ein Anschluss mit Kreuzgelenk 32 seitens des magnetischen Encoders 3 bzw. der Encoderbaugruppe zugeordnet ist und einer nicht darge- stellten Ausgangswelle ein Anschluss mit Schnecke 33 bzw. Keilwelle seitens des Stators 4 bzw. der Statorbaugruppe zugeordnet ist. Ringe 13 und 14 der beiden Statorelemente des Stators 4 sind ebenfalls abgebildet. Beide Wellenabschnitte3 illustrates the embodiment of both shaft sections 1, 2 of an exemplary, preassembled sensor arrangement, wherein an input shaft, not shown, is assigned a connection with a universal joint 32 on the part of the magnetic encoder 3 or of the encoder module, and one not shown. Output shaft is a connection with worm 33 or splined shaft of the stator 4 and the stator assembly is assigned. Rings 13 and 14 of the two stator elements of the stator 4 are also shown. Both shaft sections
I und 2 sind durch einen nicht dargestellten Torsionsstab miteinander verbunden und können somit gegeneinander verdreht werden. Encoder 3 ist beispielhaft als ein Bauteil auf Wellenabschnitt montiert bzw. fest mit diesem verbunden.I and 2 are connected by a torsion bar, not shown, and thus can be rotated against each other. Encoder 3 is exemplified as a component mounted on shaft portion or fixedly connected thereto.
In Fig. 4 wird beispielhaft Trägerelement 11 mit diesem zugeordneten Statorelement 5 veranschaulicht. An TrägerelementIn FIG. 4, by way of example carrier element 11 is illustrated with this associated stator element 5. To carrier element
II ist ein Fluss-Konzentrator befestigt, welcher durch Statorelement 5, umfassend die Finger 7, verdeckt wird. Trägerelement 11 umfasst Zentrier-Einrichtungen 15, 16, welche beispielgemäß als elastische Klammern ausgebildet sind. Dabei weist Trägerelement 11 zwei Befestigungsvorrichtungen 34, 35 in Form von zwei Bohrungen zur Befestigung an einem Gehäuse aufweist. Des Weiteren weist Trägerelement 5 zwei Zentrier-Einrichtungen 15, 16 auf, welche klammerförmig ausgebildet sind sowie zwei Spreiz-Ausnehmungen 17 und 18. Ring 13 des Statorelements 5 wird von Zentrier-Einrichtungen 15 und 16 jeweils teilweise umfasst. Da in der beispielhaften Abbildung keine Spreizelemente in Spreiz-Ausnehmungen 17 und 18 eingebracht sind und Ring 13 und Zentrier-Einrichtungen 15, 16 als Presspassung ausgebildet sind ist Ring 13 in den Zentrier-Einrichtungen 15 und 16 eingeklemmt. Hierdurch können während der Fertigung der Sensoranordnung die Trägerelemente mit den Fluss-Konzentratoren ausgerichtet und dann entsprechend ausgerichtet an einem Gehäuse bzw. Gehäuseteil befestigt werden. Fig. 5 ist eine beispielhafte Sensoranordnung umfassend ein Gehäuse 25 veranschaulicht. Durch die obere Öffnung ist Stator 4 mit Ringen 13, 14 zu sehen sowie ein Teil des Encoders 3, wobei die Encoderspur, deren Magnetfeld den Stator hauptsächlich durchdringt von Stator 4 umfasst und dadurch verdeckt wird. Gehäuse 25 weist Bohrungen 37 zur Befestigung von nicht dargestellten Trägerelementen auf, an welchen jeweils ein Fluss-Konzentrator befestigt ist.II is attached to a flux concentrator, which is covered by stator 5, comprising the fingers 7. Carrier element 11 comprises centering devices 15, 16, which are designed, for example, as elastic brackets. In this case, carrier element 11 has two fastening devices 34, 35 in the form of two holes for attachment to a housing. Furthermore, carrier element 5 has two centering devices 15, 16, which are of clip-shaped construction, and two spreading recesses 17 and 18. Ring 13 of stator element 5 is partially covered by centering devices 15 and 16, respectively. Since in the exemplary illustration no spreading elements are inserted in spreading recesses 17 and 18 and ring 13 and centering devices 15, 16 are formed as a press fit ring 13 is clamped in the centering devices 15 and 16. As a result, during the manufacture of the sensor arrangement, the carrier elements can be aligned with the flux concentrators and then aligned appropriately aligned on a housing or housing part. FIG. 5 illustrates an exemplary sensor assembly including a housing 25. Through the upper opening stator 4 with rings 13, 14 can be seen and a part of the encoder 3, wherein the encoder track whose magnetic field mainly passes through the stator of stator 4 and is thereby covered. Housing 25 has holes 37 for attachment of support elements, not shown, to each of which a flux concentrator is attached.
Wie in Fig. 6 beispielhaft gezeigt, werden bzw. sind Trägerelemente 11, 12 an Gehäuse 25 mittels Schrauben 36 befestigt. Dabei sind Trägerelemente 11, 12 beispielgemäß, wie in Fig. 4 veranschaulicht an den Ringen der Statorelemente ausgerichtet. Zusätzlich werden bzw. sind Spreizelemente 19, 20, welche den Spreiz-Ausnehmungen 17, 18 der Trägerelemente zugeordnet sind, in diese Spreiz-Ausnehmungen 17, 18 eingeführt, wodurch die nicht dargestellten Zentrier- Einrichtungen Trägerelemente 11 und 12 aufgedehnt bzw. gespreizt werden. Hierdurch bildet sich jeweils ein im Wesentlichen definierter Luftspalt zwischen nicht dargestellten Fluss-Konzentratoren und Statorelemente sowie zwischen Trägerelementen 11, 12 und Statorelementen aus. Spreizelemente 19, 20 sind beispielgemäß als Spreizbolzen ausgebildet und miteinander verbunden zu einem gemeinsamen Spreizmodul 28 ausgebildet, welche relativ präzise in die Spreiz- Ausnehmungen 17 und 18 eingeführt werden kann.As shown by way of example in FIG. 6, carrier elements 11, 12 are fastened to housing 25 by means of screws 36. In this case, carrier elements 11, 12 are aligned according to the example, as illustrated in FIG. 4, on the rings of the stator elements. In addition, or are spreading elements 19, 20, which are associated with the spreading recesses 17, 18 of the support elements, inserted into these expansion recesses 17, 18, whereby the centering means, not shown, support members 11 and 12 are expanded or expanded. As a result, in each case a substantially defined air gap is formed between flow concentrators and stator elements, not shown, and between carrier elements 11, 12 and stator elements. Spreading elements 19, 20 are formed as an expansion bolt and connected to a common expansion module 28, which can be relatively precisely inserted into the expansion recesses 17 and 18, for example.
Der Stator kann somit im Betrieb berührungslos rotieren, bzw. rotatorisch ausgelenkt werden. Die Spreizelemente 19, 20 werden optional beispielhaft zunächst in die Spreiz- Ausnehmungen 17, 18 eingesetzt und bei der Montage eines hier nicht dargestellten Deckels zu einem definierten Grad weiter eingedrückt, wodurch die Zentrier-Einrichtungen in definierter Weise gespreizt bzw. aufgedehnt werden.The stator can thus rotate without contact in operation, or be rotationally deflected. The spreading elements 19, 20 are optionally used as an example first in the expansion recesses 17, 18 and further pressed during the assembly of a cover, not shown here to a defined degree, whereby the centering devices are spread or expanded in a defined manner.
Fig. 7 zeigt beispielhaftes Trägerelement 11, welches als Spritzgussteil aus Kunststoff ausgebildet ist und einen Fluss-Konzentrator 8 bzw. ein Kollektorblech als Einlegeteil aufweist. Der Fluss-Konzentrator 8 kann auch alternativ als Beschichtung auf die Trägerelement 11 bzw. den Kunststoffträger aufgebracht sein. Über die beiden dargestellten Zentrier-Einrichtungen 15 und 16, welche jeweils als Klammerteile ausgebildet sind, wird Fluss-Konzentrator 8 am nicht dargestellten Ring des Statorelements ausgerichtet bzw. zentriert .FIG. 7 shows an exemplary carrier element 11, which is designed as an injection molded part made of plastic and has a flux concentrator 8 or a collector plate as an insert part. Alternatively, the flux concentrator 8 can be applied as a coating to the carrier element 11 or the plastic carrier. About the two illustrated centering devices 15 and 16, which are each formed as bracket parts, flow concentrator 8 is aligned or centered on the ring of the stator element, not shown.
In Fig. 8 ist beispielhaft ausgebildeter erster Deckel 26 für das nicht dargestellte Gehäuse der Sensoranordnung abgebildet, wobei die Innenseite dieses Deckels zu sehen ist. Der Deckel ist insbesondere als Stahlplatte ausgebildet. An der Deckelinnenseite ist beispielgemäß eine Leiterplatte 27 befestigt und in Befestigungsmitteln 38 eingerastet. Leiterplatte 27 bzw. Platine weist zwei Magnetfeldsensorelemente 10 und 24 auf. Magnetfeldsensorelement 10 dient zur Erfassung des durch die Fluss-Konzentratoren gebündelten Magnetfelds und somit insgesamt zur indirekten Erfassung eines Drehmoments. Magnetfeldsensorelement 24 ist in eine elektronische Auswerteschaltung integriert und wird zur Erfassung einer zusätzlichen, nicht dargestellten, zweiten Encoderspur zur Messung eines Drehwinkels verwendet. Leiterplatine 27 ist mittels Einpresstechnik 39 mit externen, nicht dargestellten, elektrischen Anschlüssen eines Steckers des Gehäuses verbunden. Zusätzlich weist Deckel 26 Eindrückmittel 41 auf, welche zum Eindrücken bzw. Einführen bzw. vollständig vorgesehenen Einführen der nicht dargestellten Spreizelemente in die nicht dargestellten Spreiz-Ausnehmungen der Trägerelemente ausgebildet und vorgesehen sind.In Fig. 8 exemplified first cover 26 is shown for the housing of the sensor assembly, not shown, wherein the inside of this cover can be seen. The lid is designed in particular as a steel plate. On the inside of the cover, for example, a printed circuit board 27 is fastened and locked in fastening means 38. Circuit board 27 or board has two magnetic field sensor elements 10 and 24. Magnetic field sensor element 10 serves for detecting the magnetic field concentrated by the flux concentrators and thus for indirectly detecting a torque as a whole. Magnetic field sensor element 24 is integrated in an electronic evaluation circuit and is used to detect an additional, not shown, second encoder track used to measure a rotation angle. Printed circuit board 27 is connected by means of press-in 39 with external, not shown, electrical connections of a connector of the housing. In addition, cover 26 has indenting means 41, which are designed and provided for the insertion or insertion or fully provided insertion of the spreading elements, not shown in the spreading recesses of the support elements, not shown.
Fig. 9 veranschaulicht ein Ausführungsbeispiel der Sensoranordnung mit einem Gehäuse 25, bei welchem Deckel 26, der als Sensorträger fungiert, aus Kunststoff mit einer eingespritzten Stahlplatte zur Abschirmung des magnetischen Feldes besteht. Deckel 26 umfasst zusätzlich eine Ausbildungs- Geometrie mit der bei Montage die Spreizelemente bzw. - bolzen in die Spreiz-Ausnehmungen der Trägerelemente eingedrückt werden, wodurch die Zentrier-Einrichtungen bzw. Klammern gespreizt werden. Deckel 26 weist einen Stecker 40 bzw. Gehäusestecker 40 auf, wobei in einem nicht dargestellten Ausführungsbeispiel die Sensoranordnung direkt durch ein Kabel angeschlossen ist. Leiterplatte 27 besteht aus einer Kombination aus einer festen und einer flexiblen Leiterplatte, oder aus einer reinen flexiblen Leiterplatte, und ist damit auch für die Aufnahme von Sensoren geeignet, die Senkrecht zur Leiterplatte stehen. Je nach Schaltungsaufwand ist die Ausführung als MiD-Bauteil des Deckels bzw. Sensorträgers möglich.Fig. 9 illustrates an embodiment of the sensor assembly having a housing 25 in which lid 26, which acts as a sensor carrier, consists of plastic with an injected steel plate for shielding the magnetic field. Cover 26 additionally comprises a forming geometry with which the spreading elements or bolts are pressed into the spreading recesses of the carrier elements during assembly, as a result of which the centering devices or clamps are spread. Cover 26 has a plug 40 or housing plug 40, wherein in an embodiment, not shown, the sensor arrangement is connected directly by a cable. Printed circuit board 27 consists of a combination of a fixed and a flexible printed circuit board, or of a pure flexible printed circuit board, and is thus also suitable for receiving sensors that are perpendicular to the circuit board. Depending on the circuit complexity, the design is possible as a MiD component of the cover or sensor carrier.
Das Gehäuse und der Deckel sind aus EMV-Gründen aus Stahl oder alternativ beispielhaft aus einem anderen magnetisch leitenden Material ausgebildet. Alternativ beispielhaft ist auch ein Kunststoffgehäuse mit Einlegeteilen für die Schraubverbindungen und Lageraufnahmen vorgesehen.The housing and the lid are made of steel for EMC reasons or, alternatively, as an example of another magnetically formed conductive material. Alternatively, by way of example, a plastic housing with inserts for the screw and bearing mounts is provided.
Das in Fig. 10 gezeigte Ausführungsbeispiel der Sensoranordnung bildet bzw. ist ein funktional integriertes, gehäustes 25 Drehmoment-Lenkwinkelsensor-System. Zusätzlich ist eine mögliche, direkte ausgangseitige Anbindung mittels einer Keilwelle 33 an ein Lenkgetriebe 42 veranschaulicht. Die Sensoranordnung bzw. das gesamte Drehmoment-Lenkwinkelsensor-System umfassend Gehäuse 25 ist beispielhaft ungefähr so groß bzw. sperrig wie ein üblicher Hydraulikteil einer Lenkunterstützung ausgebildet.The exemplary embodiment of the sensor arrangement shown in FIG. 10 forms or is a functionally integrated, housed torque-steering angle sensor system 25. In addition, a possible direct output-side connection by means of a splined shaft 33 to a steering gear 42 is illustrated. The sensor assembly or the entire torque-steering angle sensor system comprising housing 25 is exemplified approximately as large or bulky as a conventional hydraulic part of a steering assistance.
Fig. 11 zeigt eine beispielhafte Sensoranordnung, als vorgeprüfte Fertigbaugruppe, welche ein relativ leicht zusammensetzbares, in sich abgeschlossenes Sensorsystem bildet, das besonders geeignet zum Einbau in ein Lenksystem ist. Dabei sind an beiden Enden eines Torsionsstabes 43 hülsenförmige Wellenabschnitte 1, 2, beispielgemäß mittels Bolzen, befestigt. Diese sind über ein Lager 44 mit Gehäuse 25 verbunden und von außen jeweils mit einem weiteren Wellenende verbindbar. Ein erster Wellenabschnitt 1 trägt eine Encoderbaugruppe 3 bzw. einen magnetischen Encoder mit zwei Encoderspuren, welche zueinander um 90° versetzt angeordnet sind. Dieser erste Wellenabschnitt 1 ist so ausgebildet, dass er mit einer nicht dargestellten Eingangswelle verbunden werden kann. Zweiter Wellenabschnitt 2 trägt einen Stator 4 bzw. eine Statorbaugruppen und ist so ausgebildet, dass er mit einer nicht dargestellten Ausgangswelle verbunden werden kann. Die beiden Wellenabschnitte 1, 2 mit ihren Anbauteilen und Torsionsstab 43 werden von Gehäuse 25 umschlossen. In dieses Gehäuse 25 sind zwei Fluss-Konzentratoren 8, 9 mit Trägerelementen 11, 12 bzw. zwei Kollektorbaugruppen eingepasst, welche jeweils aus einer elastischen Klammer mit einem magnetischen leitfähigen Kollektorblech bestehen. Diesen Kollektorbaugruppen weisen beispielgemäß jeweils ein Spreizbolzenelement 19, 20 bzw. ein Spreizmodul 28 zugeordnet, welches aus miteinander verbundenen Spreizbolzen besteht. Diese Spreizbolzenelemente sind in die jeweilige elastische Klammer bzw. in Spreiz-Ausnehmungen der Trägerelemente 11, 12 eingepasst und sorgen für einen definierten Luftspalt zwischen den jeweiligen Fluss-Konzentratoren und Statorelementen .Fig. 11 shows an exemplary sensor assembly, as a pre-tested prefabricated assembly, which forms a relatively easy to assemble, self-contained sensor system, which is particularly suitable for installation in a steering system. In this case, sleeve-shaped shaft sections 1, 2, for example by means of bolts, are attached to both ends of a torsion bar 43. These are connected via a bearing 44 with housing 25 and connectable from the outside in each case with a further shaft end. A first shaft section 1 carries an encoder module 3 or a magnetic encoder with two encoder tracks, which are arranged offset from each other by 90 °. This first shaft portion 1 is formed so that it can be connected to an input shaft, not shown. Second shaft portion 2 carries a stator 4 and a stator assemblies and is formed so that it can be connected to an output shaft, not shown. The Both shaft sections 1, 2 with their attachments and torsion bar 43 are enclosed by housing 25. In this housing 25, two flux concentrators 8, 9 are fitted with support elements 11, 12 or two collector assemblies, each consisting of an elastic clamp with a magnetic conductive collector plate. According to the example, each of these collector assemblies is assigned an expansion bolt element 19, 20 or an expansion module 28, which consists of expansion bolts connected to one another. This Spreizbolzenelemente are fitted into the respective elastic clip or in spreading recesses of the support members 11, 12 and provide for a defined air gap between the respective flux concentrators and stator elements.
In Fig. 12 ist ein beispielhaftes Trägerelement 11 abgebildet, umfassend eine Zentrier-Einrichtung 15 und eine Spreiz- ausnehmung 17, wobei eine beispielhafte Ausbildung von Zentrier-Einrichtung 15 und Spreizausnehmung 17 sowie deren Zusammenwirken insbesondere mit einem nicht dargestellten Spreizelement veranschaulicht werden soll. Spreizausnehmung 17 ist in im Inneren durch die gestrichelte Linienführung skizziert und weist eine bzw. räumliche Spreizfläche 45 auf, welche schräg ausgebildet sind. Diese Spreizfläche 45 ist an einer Innenfläche der Zentriereinrichtung 15 angeordnet, welche elastisch ausgebildet ist. Durch Einfügen eines Spreizelements in Spreizausnehmung 17, wobei das Spreizelement gegen die Spreizfläche 45 drückt, wird Zentrier- Einrichtung 15 auseinandergespreizt bzw. geweitet. FIG. 12 shows an exemplary carrier element 11, comprising a centering device 15 and a spreading recess 17, wherein an exemplary embodiment of centering device 15 and spreading recess 17 as well as their interaction should be illustrated, in particular with a spreading element, not shown. Spreizausnehmung 17 is outlined in the interior by the dashed lines and has a or spatial expansion surface 45, which are formed obliquely. This spreading surface 45 is arranged on an inner surface of the centering device 15, which is designed to be elastic. By inserting a spreading element in Spreizausnehmung 17, wherein the expansion element presses against the spreading surface 45, centering device 15 is spread apart or widened.

Claims

Patentansprüche claims
1. Sensoranordnung zur Messung eines an eine Welle angreifenden Drehmoments, wobei die Welle einen ersten Wellenabschnitt (1) und einen zweiten Wellenabschnitt (2) aufweist und diese beiden Wellenabschnitte gegeneinander verdrehbar sind, mit wenigstens einem auf dem ersten Wellenabschnitt (1) angeordneten magnetischen Encoder1. A sensor arrangement for measuring a torque acting on a shaft, wherein the shaft has a first shaft portion (1) and a second shaft portion (2) and these two shaft portions are rotated against each other, with at least one on the first shaft portion (1) arranged magnetic encoder
(3) und einem auf dem zweiten Wellenabschnitt (2) angeordneten Stator (4), wobei der Stator zwei Statorelemente (5, 6) mit jeweils abragenden Fingern (7) aufweist und den Statorelementen (5, 6) jeweils oder gemeinsam ein Fluss-Konzentrator (8, 9) zugeordnet ist, welcher das zu erfassende, durch den magnetischen Encoder (3) erzeugte, magnetische Feld mindestens einem Magnetfeldsensorelement (10) direkt oder indirekt zuführt, dadurch gekennzeichnet, dass der zumindest eine Fluss-Konzentrator (8, 9) an einem Trägerelement (11, 12) befestigt ist, welches zumindest teilweise elastisch ausgebildet ist.(3) and a stator (4) arranged on the second shaft section (2), the stator having two stator elements (5, 6) each with protruding fingers (7) and the stator elements (5, 6) in each case or together Concentrator (8, 9) is associated with which to be detected, by the magnetic encoder (3) generated magnetic field at least one magnetic field sensor element (10) directly or indirectly, characterized in that the at least one flux concentrator (8, 9 ) is attached to a support element (11, 12), which is at least partially elastic.
2. Sensoranordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Statorelemente (5, 6) jeweils einen radial abragenden Ring (13, 14) umfassen und jedem der Statorelemente (5, 6) ein Fluss-Konzentrator (8, 9) zugeordnet ist, welcher an einem Trägerelement (11, 12) befestigt ist, wobei das Trägerelement (11, 12) zumindest eine Zentrier-Einrichtung (15, 16) aufweist, welche so ausgebildet ist, dass sie den Ring (13, 14) des zugeordneten Statorelements (5, 6) zur präzisen, insbesondere im We- sentlichen zentrierten, Ausrichtung zwischen Statorelement (5, 6) und Trägerelement (11, 12) zumindest teilweise umfassen kann.2. Sensor arrangement according to claim 1, characterized in that the stator elements (5, 6) each comprise a radially projecting ring (13, 14) and each of the stator elements (5, 6) is associated with a flux concentrator (8, 9), which is fastened to a carrier element (11, 12), wherein the carrier element (11, 12) has at least one centering device (15, 16) which is designed such that it forms the ring (13, 14) of the associated stator element (11, 12). 5, 6) for precise, in particular in the We- Essentially centered, alignment between the stator element (5, 6) and carrier element (11, 12) may at least partially comprise.
3. Sensoranordnung nach Anspruch 2, dadurch gekennzeichnet, dass die Zentrier-Einrichtung (15, 16) jeweils so ausgebildet ist, dass sie den Ring (13, 14) des jeweils zugeordneten Statorelements (5, 6) zumindest teilweise so umfasst, dass Zentrier-Einrichtung (15, 16) und Ring (13, 14) eine Presspassung bilden können.3. Sensor arrangement according to claim 2, characterized in that the centering device (15, 16) is in each case designed such that it at least partially surrounds the ring (13, 14) of the respective associated stator element (5, 6), that centering Means (15, 16) and ring (13, 14) can form an interference fit.
4. Sensoranordnung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das mindestens eine Trägerelement (11, 12) eine Spreiz-Ausnehmung (17, 18) aufweist, in welche ein Spreizelement (19, 20) zumindest teilweise eingesetzt ist, wobei hierdurch wenigstens eine Zentrier- Einrichtung (15, 16) des Trägerelements (11, 12) zumindest teilweise geweitet wird.4. Sensor arrangement according to claim 2 or 3, characterized in that the at least one carrier element (11, 12) has a spreading recess (17, 18) into which a spreading element (19, 20) is at least partially inserted, thereby at least a centering device (15, 16) of the carrier element (11, 12) is at least partially widened.
5. Sensoranordnung nach mindestens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Statorelemente5. Sensor arrangement according to at least one of claims 1 to 4, characterized in that the stator elements
(5, 6) mittels eines gemeinsamen Verbindungselements (21) aus gespritztem Kunststoff miteinander verbunden sind.(5, 6) are interconnected by means of a common connecting element (21) made of molded plastic.
6. Sensoranordnung nach mindestens einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Ring (13, 14) und die Finger (7) eines Statorelements jeweils zumindest teilweise aus weichmagnetischem Material ausgebildet sind und die Finger (7) an dem Ring (13, 14) befes- tigt sind und bezüglich der Welle axial vom Ring abragend ausgerichtet und insbesondere im Wesentlichen trapezförmig ausgebildet sind.6. Sensor arrangement according to at least one of claims 1 to 5, characterized in that the ring (13, 14) and the fingers (7) of a stator each at least partially made of soft magnetic material and the fingers (7) on the ring (13 , 14) are aligned and axially projecting with respect to the shaft projecting from the ring and in particular are formed substantially trapezoidal.
7. Sensoranordnung nach mindestens einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der magnetische Encoder (3) mindestens zwei Encoderspuren (22, 23) aufweist und die Sensoranordnung zumindest zwei Magnetfeldsensorelemente (10, 24) aufweist, wobei wenigstens einer ersten Encoderspur (22) der Stator (4) zugeordnet ist und diesem mindestens ein erstes Magnetfeldsensorelement7. Sensor arrangement according to at least one of claims 1 to 6, characterized in that the magnetic encoder (3) has at least two encoder tracks (22, 23) and the sensor arrangement at least two magnetic field sensor elements (10, 24), wherein at least one first encoder track ( 22) is associated with the stator (4) and this at least a first magnetic field sensor element
(10) zugeordnet ist und dass zumindest einer zweiten Encoderspur (23) mindestens ein zweites Magnetfeldsensorelement (24) zur Messung eines relativen Verdrehwinkels zwischen den beiden Wellenabschnitten (1, 2) zugeordnet ist .(10) is assigned and that at least one second encoder track (23) at least one second magnetic field sensor element (24) for measuring a relative angle of rotation between the two shaft sections (1, 2) is assigned.
8. Sensoranordnung nach mindestens einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Sensoranordnung ein Gehäuse (25) aufweist, an welchem die Trägerelemente8. Sensor arrangement according to at least one of claims 1 to 6, characterized in that the sensor arrangement comprises a housing (25) on which the carrier elements
(11, 12) befestigt sind und welches insbesondere zur e- lektromagnetischen Abschirmung zumindest teilweise aus magnetisch leitfähigem Material ausgebildet ist.(11, 12) are attached and which is at least partially formed of magnetically conductive material in particular for e- lektromagnetischen shielding.
9. Sensoranordnung nach Anspruch 8, dadurch gekennzeichnet, dass das zumindest eine Magnetfeldsensorelement (10, 24) auf der Innenseite eines Deckels (26) des Gehäuses (25) der Sensoranordnung angeordnet ist.9. Sensor arrangement according to claim 8, characterized in that the at least one magnetic field sensor element (10, 24) on the inside of a lid (26) of the housing (25) of the sensor arrangement is arranged.
10. Verwendung der Sensoranordnung gemäß mindestens einem der Ansprüche 1 bis 9 als Drehmoment- und/oder Winkelsensor in der Lenkung eines Kraftfahrzeugs. 10. Use of the sensor arrangement according to at least one of claims 1 to 9 as a torque and / or angle sensor in the steering of a motor vehicle.
EP07857299A 2006-12-07 2007-12-07 Sensor arrangement for measuring a torque Withdrawn EP2100113A1 (en)

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DE102007059364A DE102007059364A1 (en) 2006-12-07 2007-12-07 Sensor arrangement for measuring torque affecting shaft and arrangement is used as torque or angle sensor in steering of motor vehicle, has flow concentrator that is fixed to support element which is of elastic construction in part
PCT/EP2007/063532 WO2008068334A1 (en) 2006-12-07 2007-12-07 Sensor arrangement for measuring a torque

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DE102007059364A1 (en) 2008-08-28
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US8286507B2 (en) 2012-10-16
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