WO2011023285A1 - Magnetic assembly for a torque and/or rotational angle sensor system having a magnetic ring, and production method - Google Patents

Magnetic assembly for a torque and/or rotational angle sensor system having a magnetic ring, and production method Download PDF

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Publication number
WO2011023285A1
WO2011023285A1 PCT/EP2010/004869 EP2010004869W WO2011023285A1 WO 2011023285 A1 WO2011023285 A1 WO 2011023285A1 EP 2010004869 W EP2010004869 W EP 2010004869W WO 2011023285 A1 WO2011023285 A1 WO 2011023285A1
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WO
WIPO (PCT)
Prior art keywords
magnetic ring
sleeve
dome
magnet assembly
support sleeve
Prior art date
Application number
PCT/EP2010/004869
Other languages
German (de)
French (fr)
Inventor
Dirk Rachui
Jens Thom
Frank Jerems
Original Assignee
Valeo Schalter Und Sensoren Gmbh
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 Valeo Schalter Und Sensoren Gmbh filed Critical Valeo Schalter Und Sensoren Gmbh
Publication of WO2011023285A1 publication Critical patent/WO2011023285A1/en

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2451—Incremental encoders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/80—Manufacturing details of magnetic targets for magnetic encoders

Definitions

  • the invention relates to a magnetic assembly with a magnetic ring for a torque and / or rotation angle sensor arrangement on a shaft, in particular for the detection of rotational angle or torque-dependent variables on the shaft or between partial waves according to the species of
  • Torsionssystems for example, as part of a steering shaft, a determination of the force exerted on the entire steering shaft torque can be performed, as in particular when used in steering systems of
  • Such a torque sensor usually consists of two units, namely a dynamic unit, which rotates with the steering shaft or the torsion system and a stationary static unit with electronics, which is fixed to the surrounding gear housing.
  • the static sensor unit is connected via a bearing with the dynamic unit, wherein between the transmission housing and the static sensor unit is preferably an electrical connector.
  • the magnetic ring Within the magnet assembly of the torque sensor described above is the magnetic ring, it being known per se that with such magnetic rings, with the magnetic sensor means on a changing with an absolute or relative rotation magnetic field in a
  • Such a magnetic ring can be produced by an injection molding process.
  • the ring magnet produced by injection molding is permanently firmly connected to a metal sleeve and forms the magnet assembly and the
  • Magnet assembly is then in turn permanently connected to the steering shaft.
  • the metal sleeve is important for the handling of the magnet assembly and for the actual attachment to the steering shaft.
  • connection between the ring magnet and the metal sleeve can also be made usually with or without additional media (eg plastic).
  • Torque sensor for detecting the on a steering shaft in one
  • the magnetic flux generated in the gap depends on the rotational angle position of the magnet and the detector of the sensor arrangement, wherein between the partial waves of the shaft, a torsion element is arranged, so that on the shaft
  • connection between the magnetic ring and the carrier sleeve in which the magnetic ring is connected to the carrier sleeve with an adhesive.
  • the bond can not be used in part for a connection of a plastic-bonded magnet with a steel sleeve, if the assembly is exposed to thermal influences, since the different thermal expansion coefficients of the materials may possibly lead to the destruction of the magnet.
  • gluing leads to an increase in the cost of manufacturing the assembly as an additional process.
  • the invention relates to a magnet assembly with a magnetic ring which is mounted by means of a carrier sleeve via a connection geometry on a shaft, in particular for a torque and / or rotation angle sensor arrangement, for example on the steering shaft of a motor vehicle.
  • the magnetic ring is connected radially over the carrier sleeve lying on a connection geometry with the support sleeve, which consists of domes, which are arranged on the circumference of the end face of the magnetic ring and through
  • Forming or form-fitting or non-positively connected to the carrier sleeve can be connected.
  • the dome engage in corresponding holes in the carrier sleeve and according to a second embodiment, the dome engage in corresponding radially incorporated apertures in the carrier sleeve.
  • the domes engage in the carrier sleeve via centering points located on the radially outer entrance of the apertures, wherein the centering can advantageously consist of bevels at the entrance of the apertures. This can be avoided in particular that when inserting the dome in the openings kinking of the dome takes place. According to the invention can thus also be an integration of centering, so that the centering for the exact
  • Positioning of the angular position of the magnetic ring can be used to the support sleeve.
  • Magnetic assembly for producing the positive and / or cohesive
  • the previously proposed plastic-bonded, injection-molded magnetic ring thus preferably has several on one of its end faces Mitmespritzte domes, these dome should be arranged symmetrically to the magnetic poles.
  • the support sleeve accordingly has a sufficiently large collar, which in turn has holes or openings, which are adapted in geometry and number of the number of domes of the magnet ring.
  • the domes of the magnetic ring are guided through the openings (holes or openings) on the collar of the carrier sleeve. Then the regions of the dome projecting beyond the carrier sleeve are deformed by means of a forming process in such a way that a firm connection (analogous to a riveted connection) is produced.
  • Ultrasonic caulking and hot caulking are particularly suitable as forming processes, although other processes are also suitable, provided that they have the
  • connection makes no additional material for the connection, such as adhesive or additional plastic extrusion, between the magnetic ring and the carrier sleeve necessary.
  • the connection is as well
  • connection largely insensitive to temperature changes.
  • the strength of the connection is largely adjustable by the number and geometry of the dome and it is only a small additional height (about 1 mm) necessary for the connection.
  • FIG. 1 shows an exemplary embodiment of a magnetic ring with domes distributed on the frontal circumference
  • Figure 2 is a corresponding to Figure 1 support sleeve with holes
  • Figure 3 a corresponding to Figure 1 support sleeve with radial
  • FIGS. 4A and 4B show two views of an assembly of magnetic ring and carrier sleeve according to Figures 1 and 2,
  • Figures 5A and 5B show two views of centering on the domes of Figure 1 ff and
  • 6A and 6B show two views of an assembly of magnetic ring and carrier sleeve after caulking the dome according to the figures 1 ff.
  • FIG. 1 shows a basic application example of a magnet ring 30 as a component of a magnet assembly for a sensor arrangement described in the introduction to a shaft, for example for rotation angle or torque measurement.
  • FIG. 1 shows an exemplary embodiment of the magnetic ring 30 which has eight domes 31 distributed on the front-side circumference.
  • Figure 2 shows to a corresponding to the figure 1 support sleeve 32 with holes 33 and Figure 3 a support sleeve 34 with radially incorporated apertures 35th
  • FIGS. 4A and 4B show two views of an assembly of the FIG.
  • Figures 5A and 5B show two views of centering on the support sleeve 32, wherein at the openings 35 centering 36 are provided as chamfers, which lead to a centering insertion of the dome 31 in the openings 35 and avoid kinking of the dome 31 and thus an accurate Ensure positioning of the angular position of the magnetic ring 30 to the support sleeve 31.
  • FIGS. 6A and 6B show two views of an assembly of the invention

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

Abstract

The invention relates to a magnetic assembly, comprising a magnetic ring (30) that is attached to a shaft by means of a support sleeve (32) via a connection geometry, particularly for a torque and/or rotational angle sensor system. Positioned radially above the support sleeve (32), the magnetic ring (30) is connected by way of a connection geometry to the support sleeve, which consists of domes (31) that are arranged on the circumference of the end face of the magnetic ring (30) and can be positively or non-positively connected to the support sleeve (32; 34) by way of metal forming.

Description

Beschreibung  description
Maqnetbauqruppe für eine Drehmoment- und/oder Drehwinkelsensoranordnung mit einem Maqnetrinq und Herstellungsverfahren Maqnetbauqruppe for a torque and / or rotation angle sensor assembly with a Maqnetrinq and manufacturing method
Stand der Technik State of the art
Die Erfindung betrifft eine Magnetbaugruppe mit einem Magnetring für eine Drehmoment- und/oder Drehwinkelsensoranordnung auf einer Welle, insbesondere zur Detektion von drehwinkel- oder drehmomentabhängigen Größen an der Welle oder zwischen Teilwellen nach der Gattung des The invention relates to a magnetic assembly with a magnetic ring for a torque and / or rotation angle sensor arrangement on a shaft, in particular for the detection of rotational angle or torque-dependent variables on the shaft or between partial waves according to the species of
Hauptanspruchs und den Verfahrensansprüchen. Main claim and the method claims.
Besonders mit berührungslos arbeitenden Winkelsensoren und einer Messung einer relativen Verdrehung von zwei Wellenenden eines sich drehendenEspecially with non-contact angle sensors and a measurement of a relative rotation of two shaft ends of a rotating
Torsionssystems, zum Beispiel als Teil einer Lenkwelle, kann eine Ermittlung des auf die gesamte Lenkwelle ausgeübten Drehmoments durchgeführt werden, wie es insbesondere bei einem Einsatz in Lenksystemen von Torsionssystems, for example, as part of a steering shaft, a determination of the force exerted on the entire steering shaft torque can be performed, as in particular when used in steering systems of
Kraftfahrzeugen mit elektrischer Lenkkraftunterstützung erforderlich ist. Ein solcher Drehmomentsensor besteht in der Regel aus zwei Einheiten, nämlich einer dynamischen Einheit, welche sich mit der Lenkwelle bzw. dem Torsionssystem mitdreht und einer ortsfesten statischen Einheit mit einer Elektronik, welche an dem umgebenden Getriebegehäuse fixiert ist. Die statische Sensoreinheit ist über eine Lagerung mit der dynamischen Einheit verbunden, wobei sich zwischen dem Getriebegehäuse und der statischen Sensoreinheit vorzugsweise eine elektrische Steckverbindung befindet. Innerhalb der Magnetbaugruppe des zuvor beschriebenen Drehmomentsensors befindet sich der Magnetring, wobei es an sich bekannt ist, dass mit solchen Magnetringen, die mit magnetischen Sensormitteln über ein sich mit einer absoluten oder relativen Drehung ändernden Magnetfeld in einem Vehicles with electric power steering is required. Such a torque sensor usually consists of two units, namely a dynamic unit, which rotates with the steering shaft or the torsion system and a stationary static unit with electronics, which is fixed to the surrounding gear housing. The static sensor unit is connected via a bearing with the dynamic unit, wherein between the transmission housing and the static sensor unit is preferably an electrical connector. Within the magnet assembly of the torque sensor described above is the magnetic ring, it being known per se that with such magnetic rings, with the magnetic sensor means on a changing with an absolute or relative rotation magnetic field in a
Funktionszusammenhang stehen, die Drehbewegungen der Welle Function context are the rotational movements of the shaft
berührungslos erfasst werden können. Ferner ist es an sich bekannt, dass ein solcher Magnetring mit einem Spritzgießverfahren hergestellt werden kann. can be detected without contact. Furthermore, it is known per se that such a magnetic ring can be produced by an injection molding process.
Ein solcher an sich bekannter kunststoffgebundener, in einem Such a per se known plastic-bound, in one
Spritzgießverfahren hergestellter Ringmagnet wird dabei mit einer Metallhülse dauerhaft fest verbunden und bildet die Magnetbaugruppe und die In this case, the ring magnet produced by injection molding is permanently firmly connected to a metal sleeve and forms the magnet assembly and the
Magnetbaugruppe wird dann ihrerseits mit der Lenkwelle dauerhaft verbunden. Die Metallhülse ist dabei für das Handling der Magnetbaugruppe und für die eigentliche Befestigung auf der Lenkwelle wichtig. Die Verbindung zwischen dem Ringmagneten und der Metallhülse kann jedoch auch in der Regel mit oder ohne zusätzliche Medien (z. B. Kunststoff) vorgenommen werden.  Magnet assembly is then in turn permanently connected to the steering shaft. The metal sleeve is important for the handling of the magnet assembly and for the actual attachment to the steering shaft. However, the connection between the ring magnet and the metal sleeve can also be made usually with or without additional media (eg plastic).
Beispielsweise ist aus der DE 102 56 322 A1 bekannt, dass ein solcher For example, it is known from DE 102 56 322 A1 that such a
Drehmomentsensor zur Erfassung des an einer Lenkwelle in einem Torque sensor for detecting the on a steering shaft in one
Kraftfahrzeug anstehenden Drehmoments, jeweils an zwei sich Motor vehicle pending torque, each at two themselves
gegenüberliegenden Teilwellen der Lenkwelle angebracht ist. Auf der ersten Teilwelle ist hier eine drehfest angebrachte Hülse mit Magneten vorhanden und auf der anderen Teilwelle ist ein Magnetfeldsensor angebracht, der dem opposite partial shafts of the steering shaft is mounted. On the first part of shaft here is a rotatably mounted sleeve with magnets available and on the other part of wave a magnetic field sensor is mounted, the
Magneten an der ersten Teilwelle über einen Zwischenraum gegenüberliegt. Magnet on the first part of the wave across a gap.
Bei dieser bekannten Anordnung hängt der im Zwischenraum erzeugte magnetische Fluss von der Drehwinkellage zischen dem Magneten und dem Detektor der Sensoranordnung ab, wobei zwischen den Teilwellen der Welle ein Torsionselement angeordnet ist, sodass hieraus das auf die Welle In this known arrangement, the magnetic flux generated in the gap depends on the rotational angle position of the magnet and the detector of the sensor arrangement, wherein between the partial waves of the shaft, a torsion element is arranged, so that on the shaft
einwirkende Drehmoment messbar ist. Weiterhin ist das zuvor beschriebene Sensorprinzip auch aus der WO 02/071019 A bekannt. acting torque is measurable. Furthermore, the sensor principle described above is also known from WO 02/071019 A.
Es ist weiterhin für sich gesehen beispielsweise aus der DE 108 36 451 C2 oder der DE 200 02 277 U1 bekannt, dass der Magnetring formschlüssig mit einer Trägerhülse verbunden wird. Zwischen dem Magnetring und der Trägerhülse befindet sich ein Zwischenelement, welches mechanische It is also known per se, for example, from DE 108 36 451 C2 or DE 200 02 277 U1 that the magnetic ring is positively connected to a carrier sleeve. Between the magnetic ring and the Carrier sleeve is an intermediate element, which mechanical
Spannungen, die durch wechselnde Wärmelasten hervorgerufen sein können, aufnimmt und die daraus resultierende Schädigung des Magnetringes verhindert. In beiden Fällen ist der Magnetring an die relativ kurze Trägerhülse angebunden, welche axial hinter oder vor dem Magnetring liegt. In der Regel ist die Verbindung der Trägerhülse und der Welle als Spielpassung ausgelegt. Der dadurch zwischen der Trägerhülse und der Welle eventuell befindliche Luftspalt führt zu einer Rundlaufabweichung und zu einer Verkippung der Hülse auf der Welle, wie es in Figur 1 der Zeichnung dargestellt ist. Da sich die Trägerhülse somit neben dem Magnetringes befindet, führt die Verkippung durch die axiale Verlängerung des Magnetringes zu einer zusätzlichen Vergrößerung des Rundlaufes. Der Raum, den die Magnetbaugruppe insgesamt benötigt, vergrößert sich dadurch in nachteiliger Weise. In der DE 198 36 451 A1 wird ein gespritzt hergestellter Ringmagnet Tensions, which can be caused by changing heat loads, absorbs and prevents the resulting damage to the magnetic ring. In both cases, the magnetic ring is connected to the relatively short carrier sleeve which lies axially behind or in front of the magnetic ring. As a rule, the connection of the carrier sleeve and the shaft is designed as a clearance fit. The air gap possibly present between the carrier sleeve and the shaft leads to a runout and to a tilting of the sleeve on the shaft, as shown in Figure 1 of the drawing. Since the carrier sleeve is thus located next to the magnetic ring, the tilting leads through the axial extension of the magnetic ring to an additional increase in the concentricity. The space required by the magnet assembly as a whole is thereby disadvantageously increased. In DE 198 36 451 A1 an injection molded ring magnet is produced
beschrieben, bei dem eine Metallhülse als Einlegeteil verwendet wird, wobei aus dem Bund der Metallhülse Ausklinkungen hervorstehen, welche den Formschluss mit dem Ringmagnet bilden. described in which a metal sleeve is used as an insert, protruding from the collar of the metal sleeve notches, which form the positive connection with the ring magnet.
Eine weitere an sich bekannte Möglichkeit ist eine Verbindung zwischen dem Magnetring und der Trägerhülse, bei der der Magnetring mit einem Klebstoff mit der Trägerhülse verbunden wird. Die Klebung kann für eine Verbindung eines kunststoffgebundenen Magneten mit einer Stahlhülse teilweise nicht verwendet werden, wenn die Baugruppe thermischen Einflüssen ausgesetzt ist, da die unterschiedlichen Wärrmeausdehnungskoeffizienten der Materialien eventuell zur Zerstörung des Magneten führen können. Außerdem führt das Kleben als zusätzlicher Prozess zu einer Verteuerung der Fertigung der Baugruppe. Another known possibility is a connection between the magnetic ring and the carrier sleeve, in which the magnetic ring is connected to the carrier sleeve with an adhesive. The bond can not be used in part for a connection of a plastic-bonded magnet with a steel sleeve, if the assembly is exposed to thermal influences, since the different thermal expansion coefficients of the materials may possibly lead to the destruction of the magnet. In addition, gluing leads to an increase in the cost of manufacturing the assembly as an additional process.
Auch ein an sich bekanntes Bördeln einer geschlossenen Kontur über der Trägerhülse auch sehr aufwändig sein. Darstellung der Erfindung Also a per se known flanging a closed contour over the support sleeve also be very expensive. Presentation of the invention
Die Erfindung betrifft eine Magnetbaugruppe mit einem Magnetring, der mittels einer Trägerhülse über eine Verbindungsgeometrie auf einer Welle angebracht ist, insbesondere für eine Drehmoment- und/oder Drehwinkelsensoranordnung zum Beispiel an der Lenkwelle eines Kraftfahrzeugs. Erfindungsgemäß ist der Magnetring radial über der Trägerhülse liegend über eine Verbindungsgeometrie mit der Trägerhülse verbunden, die aus Domen besteht, die auf dem Umfang der Stirnfläche des Magnetrings angeordnet sind und durch The invention relates to a magnet assembly with a magnetic ring which is mounted by means of a carrier sleeve via a connection geometry on a shaft, in particular for a torque and / or rotation angle sensor arrangement, for example on the steering shaft of a motor vehicle. According to the invention, the magnetic ring is connected radially over the carrier sleeve lying on a connection geometry with the support sleeve, which consists of domes, which are arranged on the circumference of the end face of the magnetic ring and through
Umformtechniken form- oder kraftschlüssig mit der Trägerhülse verbindbar sind. Gemäß einer ersten Ausführungsform greifen die Dome in korrespondierende Löcher in die Trägerhülse ein und gemäß einer zweiten Ausführungsform greifen die Dome in korrespondierende radial eingearbeitete Durchbrüche in die Trägerhülse ein. Forming or form-fitting or non-positively connected to the carrier sleeve can be connected. According to a first embodiment, the dome engage in corresponding holes in the carrier sleeve and according to a second embodiment, the dome engage in corresponding radially incorporated apertures in the carrier sleeve.
Besonders vorteilhaft ist es, wenn die Dome über am radial außenliegenden Eingang der Durchbrüche liegende Zentrierungen in die Trägerhülse eingreifen, wobei die Zentrierungen in vorteilhafter weise aus Abschrägungen am Eingang der Durchbrüche bestehen können. Hiermit kann insbesondere vermieden werden, dass beim Einführen der Dome in die Durchbrüche ein Abknicken der Dome erfolgt. Gemäß der Erfindung kann somit auch eine Integration von Zentrierelementen erfolgen, sodass die Zentrierung auch für die genaue It is particularly advantageous if the domes engage in the carrier sleeve via centering points located on the radially outer entrance of the apertures, wherein the centering can advantageously consist of bevels at the entrance of the apertures. This can be avoided in particular that when inserting the dome in the openings kinking of the dome takes place. According to the invention can thus also be an integration of centering, so that the centering for the exact
Positionierung der Winkellage des Magnetrings zur Trägerhülse genutzt werden kann.  Positioning of the angular position of the magnetic ring can be used to the support sleeve.
Weiterhin werden vorteilhafte Verfahren zur Herstellung einer solchen Furthermore, advantageous methods for producing such
Magnetbaugruppe zur Herstellung der form- und/oder stoffschlüssigen Magnetic assembly for producing the positive and / or cohesive
Verbindung zwischen dem Magnetring und der Trägerhülse vorgeschlagen, bei denen nach dem Zusammenfügen der Dome des Magnetrings und der Proposed connection between the magnetic ring and the carrier sleeve, in which after the assembly of the domes of the magnetic ring and the
Trägerhülse die Dome über den Löchern oder den Durchbrüchen zur Carry sleeve the dome over the holes or breakthroughs to
Herstellung einer Vernietung verstemmt werden. Making a riveting be caulked.
Der zuvor vorgeschlagene kunststoffgebundene, spritzgegossene Magnetring verfügt somit auf einer seiner Stirnflachen vorzugsweise über mehrere mitangespritzte Dome, wobei diese Dome symmetrisch zu den Magnetpolen angeordnet sein sollten. Die Trägerhülse verfügt entsprechend über einen ausreichend dimensionierten Bund, welcher seinerseits Bohrungen oder Durchbrüche besitzt, die in Geometrie und Anzahl angepasst sind an die Zahl der Dome des Magnetrings. The previously proposed plastic-bonded, injection-molded magnetic ring thus preferably has several on one of its end faces Mitmespritzte domes, these dome should be arranged symmetrically to the magnetic poles. The support sleeve accordingly has a sufficiently large collar, which in turn has holes or openings, which are adapted in geometry and number of the number of domes of the magnet ring.
Für die Verbindung von Magnetring und Trägerhülse werden die Dome des Magnetringes durch die Öffnungen (Löcher oder Durchbrüche) am Bund der Trägerhülse geführt. Dann werden die über die Trägerhülse hinausstehenden Bereiche der Dome mittels eines Umformverfahrens so verformt, dass eine feste Verbindung (analog einer Nietverbindung) entsteht. Als Umformverfahren eignen sich insbesondere das Ultraschallverstemmen und das Heißverstemmen, wobei auch andere Verfahren anwendbar sind, sofern sie die den For the connection of the magnetic ring and the carrier sleeve, the domes of the magnetic ring are guided through the openings (holes or openings) on the collar of the carrier sleeve. Then the regions of the dome projecting beyond the carrier sleeve are deformed by means of a forming process in such a way that a firm connection (analogous to a riveted connection) is produced. Ultrasonic caulking and hot caulking are particularly suitable as forming processes, although other processes are also suitable, provided that they have the
Magnetring nicht übermäßig belasten. Do not overload the magnetic ring.
Insbesondere durch die letztgenannte Ausführungsform ergeben sich Vorteile dadurch, dass die Erfindung keinen zusätzlichen Werkstoff für die Verbindung, wie Kleber oder zusätzliche Kunststoffumspritzung, zwischen dem Magnetring und der Trägerhülse notwendig macht. Die Verbindung ist außerdem In particular, by the latter embodiment, there are advantages in that the invention makes no additional material for the connection, such as adhesive or additional plastic extrusion, between the magnetic ring and the carrier sleeve necessary. The connection is as well
weitgehend unempfindlich gegenüber Temperaturänderungen. Die Festigkeit der Verbindung ist weitgehend durch Zahl und Geometrie der Dome einstellbar und es ist nur eine geringe zusätzliche Bauhöhe (ca. 1 mm) für die Verbindung notwendig. largely insensitive to temperature changes. The strength of the connection is largely adjustable by the number and geometry of the dome and it is only a small additional height (about 1 mm) necessary for the connection.
Die vorgeschlagenen Umformverfahren sind ausreichend geprüfte und bewährte Verfahren, wobei bei einem Teilversagen der Verbindung die Funktion der Verbindung insgesamt noch vorhanden ist, d. h., bei einem Abbrechen eines Domes halten die übrigen Dome die Befestigung aufrecht. Eine The proposed forming processes are sufficiently tested and proven methods, wherein in case of a partial failure of the compound, the function of the compound as a whole still exists, d. h., when canceling a dome keep the other dome upright. A
alternative Anbringung von Schnappverbindung an den Domen erfordert dagegen einen relativ großen Bauraum, wobei die Ausführung auch komplexer und temperaturempfindlich ist; eine Materialermüdung führt außerdem oft zum Lösen der Verbindung. Kurze Beschreibung der Zeichnung Ausführungsbeispiele der Erfindung werden anhand der Figuren der Zeichnung erläutert. Es zeigen: alternative attachment of snap connection to the domes, however, requires a relatively large amount of space, the execution is also more complex and temperature sensitive; Material fatigue also often causes the connection to break. Brief Description of the Drawings Embodiments of the invention will be explained with reference to the figures of the drawing. Show it:
Figur 1 ein Ausführungsbeispiel eines Magnetringes mit auf dem stirnseitigen Umfang verteilten Domen, FIG. 1 shows an exemplary embodiment of a magnetic ring with domes distributed on the frontal circumference,
Figur 2 eine zu Figur 1 korrespondierenden Trägerhülse mit Löchern, Figur 3 eine zu Figur 1 korrespondierenden Trägerhülse mit radial Figure 2 is a corresponding to Figure 1 support sleeve with holes, Figure 3 a corresponding to Figure 1 support sleeve with radial
eingearbeiteten Durchbrüchen, incorporated breakthroughs,
Figur 4A und 4B zwei Ansichten einer Zusammenfügung von Magnetring und Trägerhülse nach den Figuren 1 und 2, 4A and 4B show two views of an assembly of magnetic ring and carrier sleeve according to Figures 1 and 2,
Figur 5A und 5B zwei Ansichten von Zentrierungen an den Domen nach Figur 1 ff und Figures 5A and 5B show two views of centering on the domes of Figure 1 ff and
Figur 6A und 6B zwei Ansichten einer Zusammenfügung von Magnetring und Trägerhülse nach einem Verstemmen der Dome nach den Figuren 1 ff. 6A and 6B show two views of an assembly of magnetic ring and carrier sleeve after caulking the dome according to the figures 1 ff.
Wege zur Ausführung der Erfindung Figur 1 zeigt ein prinzipielles Anwendungsbeispiel eines Magnetringes 30 als Bestandteil einer Magnetbaugruppe für eine in der Beschreibungseinleitung beschriebene Sensoranordnung an einer Welle, beispielsweise zur Drehwinkeloder Drehmomentmessung. 1 shows a basic application example of a magnet ring 30 as a component of a magnet assembly for a sensor arrangement described in the introduction to a shaft, for example for rotation angle or torque measurement.
In der Figur 1 ist ein Ausführungsbeispiel des Magnetringes 30 gezeigt, der hier acht auf dem stirnseitigen Umfang verteilte Dome 31 aufweist. Figur 2 zeigt dazu eine zu der Figur 1 korrespondierende Trägerhülse 32 mit Löchern 33 und Figur 3 eine Trägerhülse 34 mit radial eingearbeiteten Durchbrüchen 35. FIG. 1 shows an exemplary embodiment of the magnetic ring 30 which has eight domes 31 distributed on the front-side circumference. Figure 2 shows to a corresponding to the figure 1 support sleeve 32 with holes 33 and Figure 3 a support sleeve 34 with radially incorporated apertures 35th
Aus Figur 4A und 4B sind zwei Ansichten einer Zusammenfügung des FIGS. 4A and 4B show two views of an assembly of the FIG
Magnetrings 30 nach der Figur 1 und der Trägerhülse 32 nach der Figur 2 zu entnehmen, wobei Figur 4A eine Ansicht und Figur 4B einen Schnitt darstellt. Magnet ring 30 according to the figure 1 and the support sleeve 32 shown in Figure 2, wherein Figure 4A is a view and Figure 4B is a section.
Figur 5A und 5B zeigen zwei Ansichten von Zentrierungen an der Trägerhülse 32, wobei an den Durchbrüchen 35 Zentrierungen 36 als Abschrägungen vorhanden sind, die zu einem zentrierenden Einfügen der Dome 31 in die Durchbrüche 35 führen und ein Abknicken der Dome 31 vermeiden und somit eine genaue Positionierung der Winkellage des Magnetrings 30 zur Trägerhülse 31 gewährleisten. Figures 5A and 5B show two views of centering on the support sleeve 32, wherein at the openings 35 centering 36 are provided as chamfers, which lead to a centering insertion of the dome 31 in the openings 35 and avoid kinking of the dome 31 and thus an accurate Ensure positioning of the angular position of the magnetic ring 30 to the support sleeve 31.
In Figur 6A und 6B sind zwei Ansichten einer Zusammenfügung des FIGS. 6A and 6B show two views of an assembly of the invention
Magnetrings 30 nach der Figur 1 und der Trägerhülse 32 nach der Figur 2 nach einem Verstemmen der Dome 31 nach der Figur 1 zu entnehmen, wobei Figur 6A eine Ansicht und Figur 6B einen Schnitt darstellt. Magnet ring 30 according to the figure 1 and the support sleeve 32 according to the figure 2 after a caulking of the dome 31 according to the figure 1, wherein Figure 6A is a view and Figure 6B is a section.

Claims

Ansprüche claims
1. Magnetbaugruppe mit einem Magnetring (30), der mittels einer Trägerhülse (32) über eine Verbindungsgeometrie auf einer Welle angebracht ist, insbesondere für eine Drehmoment- und/oder Drehwinkelsensoranordnung, dadurch gekennzeichnet, dass der Magnetring (30) radial über der 1. Magnet assembly with a magnetic ring (30) which is mounted by means of a support sleeve (32) via a connection geometry on a shaft, in particular for a torque and / or rotation angle sensor arrangement, characterized in that the magnetic ring (30) radially over the
Trägerhülse (32) liegend über eine Verbindungsgeometrie mit der  Carrier sleeve (32) lying over a connection geometry with the
Trägerhülse verbunden ist, die aus Domen (31) besteht, die auf dem  Carrier sleeve is connected, which consists of domes (31), which on the
Umfang der Stirnfläche des Magnetrings (30) angeordnet sind und durch Umformtechniken form- oder kraftschlüssig mit der Trägerhülse (32;34) verbindbar sind.  Circumference of the end face of the magnet ring (30) are arranged and by forming techniques positively or non-positively with the support sleeve (32; 34) are connectable.
2. Magnetbaugruppe nach Anspruch 1 dadurch gekennzeichnet, dass die 2. Magnet assembly according to claim 1, characterized in that the
Dome (31) in korrespondierende Löcher (33) in die Trägerhülse (32) eingreifen.  Dome (31) engage in corresponding holes (33) in the support sleeve (32).
3. Magnetbaugruppe nach Anspruch 1 dadurch gekennzeichnet, dass die 3. Magnet assembly according to claim 1, characterized in that the
Dome (31) in korrespondierende radial eingearbeitete Durchbrüche (35) in die Trägerhülse (34) eingreifen.  Dome (31) engage in corresponding radially machined openings (35) in the support sleeve (34).
4. Magnetbaugruppe nach Anspruch 3 dadurch gekennzeichnet, dass die 4. Magnet assembly according to claim 3, characterized in that the
Dome (31) über am radial außenliegenden Eingang der Durchbrüche (35) liegende Zentrierungen (36) in die Trägerhülse (34) eingreifen.  Dome (31) via at the radially outer input of the openings (35) lying centerings (36) engage in the carrier sleeve (34).
5. Magnetbaugruppe nach Anspruch 4 dadurch gekennzeichnet, dass die 5. Magnet assembly according to claim 4, characterized in that the
Zentrierungen (36) aus Abschrägungen am Eingang der Durchbrüche (35) bestehen.  Centering (36) consist of bevels at the entrance of the openings (35).
6. Verfahren zur Herstellung einer Magnetbaugruppe nach Anspruch 11 , 6. A method for producing a magnet assembly according to claim 11,
dadurch gekennzeichnet, dass zur Herstellung der form- und/oder stoffschlüssigen Verbindung zwischen dem Magnetring (30) und der Trägerhülse (32;34) nach dem Zusammenfügen der Dome (31) des characterized in that for the production of the form and / or cohesive connection between the magnetic ring (30) and the carrier sleeve (32, 34) after assembly of the dome (31) of the
Magnetrings (30) und der Trägerhülse (32;34) die Dome (31) über den Löchern (33) oder den Durchbrüchen (35) zur Herstellung einer Vernietung verstemmt werden.  Magnetic rings (30) and the support sleeve (32; 34), the dome (31) over the holes (33) or the openings (35) are caulked to produce a riveting.
7. Verfahren zur Herstellung einer Magnetbaugruppe nach Anspruch 6, 7. A method for producing a magnet assembly according to claim 6,
dadurch gekennzeichnet, dass die Vernietung durch Ultraschallverstemmen hergestellt wird.  characterized in that the riveting is made by ultrasonic caulking.
8. Verfahren zur Herstellung einer Magnetbaugruppe nach Anspruch 6, 8. A method for producing a magnet assembly according to claim 6,
dadurch gekennzeichnet, dass die Vernietung durch Heißverstemmen hergestellt wird.  characterized in that the riveting is made by hot caulking.
PCT/EP2010/004869 2009-08-27 2010-08-09 Magnetic assembly for a torque and/or rotational angle sensor system having a magnetic ring, and production method WO2011023285A1 (en)

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