EP0071885A2 - Flyweel gear pulse generator comprising a marked tooth - Google Patents

Flyweel gear pulse generator comprising a marked tooth Download PDF

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Publication number
EP0071885A2
EP0071885A2 EP82106828A EP82106828A EP0071885A2 EP 0071885 A2 EP0071885 A2 EP 0071885A2 EP 82106828 A EP82106828 A EP 82106828A EP 82106828 A EP82106828 A EP 82106828A EP 0071885 A2 EP0071885 A2 EP 0071885A2
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EP
European Patent Office
Prior art keywords
sprocket according
tooth head
tooth
insert
slot
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.)
Granted
Application number
EP82106828A
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German (de)
French (fr)
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EP0071885A3 (en
EP0071885B1 (en
Inventor
Manfred Knüfelmann
Burkhard Brandner
Reinhold Blauhut
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Schaeffler Engineering GmbH
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AFT Atlas Fahrzeugtechnik GmbH
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Application filed by AFT Atlas Fahrzeugtechnik GmbH filed Critical AFT Atlas Fahrzeugtechnik GmbH
Priority to AT82106828T priority Critical patent/ATE30460T1/en
Publication of EP0071885A2 publication Critical patent/EP0071885A2/en
Publication of EP0071885A3 publication Critical patent/EP0071885A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/067—Electromagnetic pick-up devices, e.g. providing induced current in a coil
    • F02P7/0675—Electromagnetic pick-up devices, e.g. providing induced current in a coil with variable reluctance, e.g. depending on the shape of a tooth

Definitions

  • the invention relates to a pulse generator ring gear with a marked tooth head.
  • the pulse generator spider is opposed to a tooth pulse sensor.
  • the tooth pulse sensor is aligned with the circumference of the pulse generator ring gear and contains a high-frequency excitation coil which emits an electromagnetic high-frequency excitation field.
  • This high-frequency excitation field penetrates the ring gear and is influenced or modulated by the passing teeth of the ring gear. This modulation can be detected in an evaluation circuit and can be used to generate tooth pulses.
  • the tooth impulses represent speed and angle information that can be used for measurements, control and regulation.
  • One field of application of the invention is a pulse-controlled ignition system for internal combustion engines, in which the starter ring gear is used to provide these tooth pulse signals.
  • the teeth of the ring gear cause eddy current losses on the one hand and on the other hand change the permeability of the magnetic circuit. This results in changes in the high-frequency field, which can be detected in evaluation circuits.
  • the object of the invention is such a tooth marking that a permanent and reliably verifiable detection of the marked tooth is possible without the mechanical functions of the ring gear be affected.
  • the influence on the high-frequency field must be large enough to enable reliable evaluation.
  • the marked tooth head has an area with a material whose relative permeability and / or specific eddy current losses are different from those of the ring gear itself.
  • the relative permeability of the ring gear itself has a value of about 100.
  • Substances with a high relative permeability and thus also high magnetic conductivity are soft iron, mu-metal, amorphous metal, metallic glasses, which are suitable as materials for the marking.
  • a material with comparatively low eddy current losses can be used as the material in order to ensure a corresponding influence on the high-frequency field.
  • the marking enables a significant change in the high-frequency field compared to the change in the high-frequency field caused by a normal tooth, so that a reliable detection of the marked tooth is possible.
  • the invention proposes that the marked tooth head has an axial slot into which an insert made of the material mentioned is inserted.
  • the tooth tip in question is permanently and reliably marked.
  • the insert is designed as a U-shaped folded sheet metal part. This has several gaps in the transverse direction between the sheet metal surfaces and has the effect of a transformer sheet stack.
  • the pinion of the starter With the starter ring gear on the flywheel of an internal combustion engine, the pinion of the starter is engaged in the axial direction during the starting process. If the single tooth hits the slot of the tooth marking, damage to the marked tooth can occur.
  • the invention provides that the slot depth decreases after an end face of the ring gear. In extreme cases, the slot can run out after the end face mentioned. As a result, no damage to the marked tooth can occur on this end face when the starter is engaged.
  • the insert is on the end faces of the ring gear with the Slot edges welded. This also ensures that the surfaces of the insert and the tooth head are not integrally connected to one another in the axial direction, so that eddy current paths are interrupted.
  • the axial longitudinal edges can also be welded to the slot edges. Protruding sheet metal edges during welding prevents the welding agent from clogging the middle gap of the insert. The protruding sheet metal edges are subsequently removed.
  • the tooth marking can also be done in such a way that a film made of the material mentioned is attached to the tooth head. In this case, any mechanical weakening of the marked tooth is excluded.
  • the thin film of the marking material contains amorphous metal, mu-metal or another low eddy current loss material with high permeability.
  • the film thickness is approximately 0.03 to 0.1 mm.
  • the film must be attached gently to prevent damage to the material due to excessive heating or other stress.
  • the attachment can be done by resistance spot welding, by ultrasonic spot welding or by gluing.
  • the warming must not exceed 300 ° C. This is guaranteed when using a microelectrode.
  • Fig. 1 shows a section of the starter ring gear 1 for the starter of an internal combustion engine, not shown.
  • the circumferential end faces of the tooth heads 2 of the teeth 3 are opposed by a tooth pulse sensor 4, to which a tooth pulse generator 5 is connected.
  • the tooth pulse generator generates an electromagnetic high-frequency field, which is emitted by means of a coil within the tooth pulse sensor 4.
  • the field penetrates the teeth of the ring gear.
  • the high-frequency field is modulated in accordance with the permeability of the tooth tips, which is different from air, or the eddy current losses. This modulation can be evaluated, so that a generation tooth pulse is possible.
  • a tooth head 6 is marked so that it can be used as a reference tooth head to represent a reference phase.
  • this tooth head 6 has an axial slot 7 which rises towards the end face 8 of the starter ring gear 1 or the tooth head 6, cf. 2 in particular.
  • the axial slot can run out on this end face 8 on the peripheral surface of the tooth head 6, so that the axial slot 7 does not intersect the end face 8. Because on this end face 8 the pinion of the starter is engaged.
  • the axial slot 7 receives an insert 9 which is adapted to the profile of the axial slot 7 and is wedge-shaped in the case of an axial slot of the shape shown. While the ring gear itself consists of a material with comparatively high eddy current losses, the material of the system 9 has low eddy current losses. It is e.g. around soft iron, mu-metal or the like. As a result, a clearly deviating signal is obtained in the tooth pulse sensor 4 for the marked tooth head 6, which signal can be evaluated accordingly.
  • the insert 9 is fastened to the end faces of the starter ring by welded connections 11. Such welded connections must not be present on the peripheral surface so that the eddy current paths are interrupted.
  • Permeability can also be used as a different material property.
  • the ring gear is usually made of iron and, as a result, has a relative permeability of approximately 100.
  • the relative permeability of the marking material must have substantially larger values, approximately 250,000 to 500,000.
  • Such materials are mu-metal, amorphous metal, ferrite.
  • the shape of the axial slot 7 with increasing foot surface ensures that there is no weakening of the tooth head 6 on the end face 8, so that no damage to the tooth head is to be feared during the starter engagement process.
  • Fig. 3 shows an embodiment in which the insert is designed as a folded sheet metal part 10, so that the eddy current losses are reduced even further.
  • the sheet metal part inserted into the slot can initially protrude over the slot edges with edge strips 21.
  • the outer radial sheet metal edges are connected to the slot edges by weld seams 11.
  • the edge strips 21 are removed, so that the weld seams 11 and the sheet metal edges are flush with the slot edges.
  • Pie border streak fen 21 prevent the welding agent from flowing into the gap between the metal strips. As a result, a safe blocking effect of the column for eddy currents is guaranteed.
  • the insert is only cohesively connected to the tooth head at the end faces by welded connections 11.
  • Such welded connections are not present on the peripheral surface of the tooth head, so that there is no integral connection between the surfaces of the insert 9 or the flat part 10 and the material of the tooth head.
  • the folded sheet metal part acts like a transformer sheet pack. As a result, the low eddy current losses remain guaranteed.
  • weld seams 11 ' can also be provided on the top surface of the tooth head, in order to increase the mechanical stability of the arrangement.
  • FIG. 4 shows a further embodiment of the invention with a film 12 which is connected to the peripheral surface of the tooth head 6 by connections 13.
  • the film 12 consists of amorphous metal, mu-metal or a similar low eddy current loss material and has a thickness of C, 03 to 0.1 mm. It can be attached to the tooth head by resistance spot welding. With this resistance spot welding, the temperature load on the film can be kept low so that the magnetic properties of the marking material are not changed.
  • the film can also be attached to the tooth head by gluing or by ultrasonic welding.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gears, Cams (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Testing Of Engines (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)

Abstract

1. A flywheel gear pulse generator comprising a marked tooth head (6), an area of said tooth head (6) consists of a material whose relative permeability and/or specific eddy current losses differ from those of the flywheel gear (1) itself, characterized in that the marked tooth head (6) has an axial slot (7) with an insert (9) of said material and, in that the depth of the slot diminished towards one face (8) of the flywheel gear.

Description

Die Erfindung betrifft einen Impulsgeberzahnkranz mit einem markierten Zahnkopf.The invention relates to a pulse generator ring gear with a marked tooth head.

Eim Impulsgeberzahnkranz steht einem Zahnimpulssensor gegenüber. Der Zahnimpulssensor ist auf den Umfang des Impulsgeberzahnkranzes ausgerichtet und enthält eine Hochfrequenzerregerspule, die ein elektromagnetisches Hochfrequenzerregerfeld aussendet. Dieses Hochfrequenzerregerfeld durchdringt den Zahnkranz und wird durch die vorbeilaufenden Zähne des Zahnkranzes beeinflußt bzw. moduliert. Diese Modulation kann in einer Auswerteschaltung erfaßt werden und zur Erzeugung von Zahnimpulsen dienen. Die Zahnimpulse stellen Drehzahl- und Winkelinformationen dar, die sich für Messungen, Steuerungen und Regelungen ausnutzen lassen. Ein Anwendungsgebiet der Erfindung ist eine impulsgesteuerte Zündanlage für Verbrennungsmotoren, bei denen der Anlaßeinspurkranz für die Bereitstellung dieser Zahnimpulssignale benutzt wird.The pulse generator spider is opposed to a tooth pulse sensor. The tooth pulse sensor is aligned with the circumference of the pulse generator ring gear and contains a high-frequency excitation coil which emits an electromagnetic high-frequency excitation field. This high-frequency excitation field penetrates the ring gear and is influenced or modulated by the passing teeth of the ring gear. This modulation can be detected in an evaluation circuit and can be used to generate tooth pulses. The tooth impulses represent speed and angle information that can be used for measurements, control and regulation. One field of application of the invention is a pulse-controlled ignition system for internal combustion engines, in which the starter ring gear is used to provide these tooth pulse signals.

Die Zähne des Zahnkranzes bedingen einerseits Wirbelstromverluste und verändern andererseits die Permeabilität des Magnetkreises. Hierdurch ergeben sich Änderungen des Hochfrequenzfeldes, die in Auswerteschaltungen erfaßt werden können.The teeth of the ring gear cause eddy current losses on the one hand and on the other hand change the permeability of the magnetic circuit. This results in changes in the high-frequency field, which can be detected in evaluation circuits.

Zur Erfassung einer Bezugsposition benötigt man einen markierten Zahn, der einen Bezugsimpuls liefert.To record a reference position, you need a marked tooth that delivers a reference pulse.

Aufgabe der Erfindung ist eine solche Zahnmarkierung, daß eine dauerhafte und sicher nachweisbare Erfassung des markierten Zahnes möglich ist, ohne daß die mechanischen Funktionen des Zahnkranzes beeinträchtigt werden. Insbesondere muß die Beeinflussung des Hochfrequenzfeldes genügend groß sein, um eine sichere Auswertung zu ermöglichen.The object of the invention is such a tooth marking that a permanent and reliably verifiable detection of the marked tooth is possible without the mechanical functions of the ring gear be affected. In particular, the influence on the high-frequency field must be large enough to enable reliable evaluation.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß der markierte Zahnkopf einen Bereich mit einem Werkstoff aufweist, dessen relative Permeabilität und/oder spezifische Wirbelstromverluste von denen des Zahnkranzes selbst verschieden sind.This object is achieved according to the invention in that the marked tooth head has an area with a material whose relative permeability and / or specific eddy current losses are different from those of the ring gear itself.

Die relative Permeabilität des Zahnkranzes selbst hat einen Wert von etwa 100. Stoffe mit hoher relativer Permeabilität umnd damit auch hoher magnetischer Leitfähigkeit sind Weicheisen, Mu-Metall, amorphes Metall, metallische Gläser, die sich als Werkstoffe für die Markierung eignen.The relative permeability of the ring gear itself has a value of about 100. Substances with a high relative permeability and thus also high magnetic conductivity are soft iron, mu-metal, amorphous metal, metallic glasses, which are suitable as materials for the marking.

Man kann als Werkstoff ein Material mit vergleichsweise geringen Wirbelstromverlusten einsetzen, um eine entsprechende Beeinflussung des Hochfrequenzfeldes zu gewährleisten. Die Markierung ermöglicht eine signifikante Änderung des Hochfrequenzfeldes gegenüber der durch einen normalen Zahn hervorgerufenen Änderung des Hochfrequenzfeldes, so daß eine sichere Erkennung des markierten Zahnes möglich ist.A material with comparatively low eddy current losses can be used as the material in order to ensure a corresponding influence on the high-frequency field. The marking enables a significant change in the high-frequency field compared to the change in the high-frequency field caused by a normal tooth, so that a reliable detection of the marked tooth is possible.

Für die Markierung schlagt die Erfindung vor, daß der markierte Zahnkopf einen Axialschlitz aufweist, in den eine Einlage aus dem genannten Werkstoff eingesetzt ist. In diesem Fall ist der betreffende Zahnkopf dauerhaft und zuverlässig markiert.For the marking, the invention proposes that the marked tooth head has an axial slot into which an insert made of the material mentioned is inserted. In this case, the tooth tip in question is permanently and reliably marked.

Zur weiteren Herabsetzung der Wirbelstromverluste ist vorgesehen, daß die Einlage als U-förmig gefaltetes Blechteil ausgebildet ist. Dieses weist in Querrichtung zwischen den Blechflächen mehrere Spalte auf und hat die Wirkung eines Transformatorblechpakets.To further reduce the eddy current losses, it is provided that the insert is designed as a U-shaped folded sheet metal part. This has several gaps in the transverse direction between the sheet metal surfaces and has the effect of a transformer sheet stack.

Beim Anlaßeinspurkranz auf der Schwungscheibe eines Verbrennungsmotors wird das Ritzel des Anlassers beim Anlaßvorgang jeweils in axialer Richtung eingespurt. Wenn der Einspurzahn auf den Schlitz der Zahnmarkierung trifft, können Beschädigungen des markierten Zahns eintreten.With the starter ring gear on the flywheel of an internal combustion engine, the pinion of the starter is engaged in the axial direction during the starting process. If the single tooth hits the slot of the tooth marking, damage to the marked tooth can occur.

Zur Beibehaltung der Festigkeit des markierten Zahns sieht die Erfindung vor, daß die Schlitztiefe nach einer Stirnseite des Zahnkranzes abnimmt. Im Extremfall kann der Schlitz nach der genannten Stirnseite auslaufen. Infolgedessen kann auf dieser Stirnseite keine Beschädigung des markierten Zahns beim Einspuren des Anlassers auftreten.In order to maintain the strength of the marked tooth, the invention provides that the slot depth decreases after an end face of the ring gear. In extreme cases, the slot can run out after the end face mentioned. As a result, no damage to the marked tooth can occur on this end face when the starter is engaged.

Damit die jeweilige Einlage fest innerhalb des Schlitzes gehalten ist, ist die Einlage an den Stirnseiten des Zahnkranzes mit den Schlitzrändem verschweißt. Dadurch ist auch gewährleistet, daß in axialer Richtung die Flächen der Einlage und des Zahnkopfes nicht stoffschlüssig miteinander verbunden sind, so daß Wirbelstrombahnen unterbrochen sind.So that the respective insert is held firmly within the slot, the insert is on the end faces of the ring gear with the Slot edges welded. This also ensures that the surfaces of the insert and the tooth head are not integrally connected to one another in the axial direction, so that eddy current paths are interrupted.

Bei Einsatz eines U-förmig gefalteten Blechteils können auch die axialen Längsränder mit den Schlitzrändern verscheißt sein. Durch überstehende Blechränder während der Schweißung wird verhindert, daß Schweißmittel den mittleren Spalt der Einlage zusetzt. Die Überstehenden Blechränder werden nachträglich entfernt.If a sheet metal part folded in a U-shape is used, the axial longitudinal edges can also be welded to the slot edges. Protruding sheet metal edges during welding prevents the welding agent from clogging the middle gap of the insert. The protruding sheet metal edges are subsequently removed.

Die Zahnmarkierung kann auch in der Weise erfolgen, daß auf dem Zahnkopf eine Folie aus dem genannten Werkstoff befestigt ist. In diesem Fall wird jede mechanische Schwächung des markierten Zahnes ausgeschlossen. Die dünne Folie des Markierungswerkstoffes enthält amorphes Metall, Mu-Metall oder ein anderes wirbelstromverlustarmes Material mit hoher Permeabilität. Die Foliendicke beträgt ca. 0,03 bis 0,1 mm.The tooth marking can also be done in such a way that a film made of the material mentioned is attached to the tooth head. In this case, any mechanical weakening of the marked tooth is excluded. The thin film of the marking material contains amorphous metal, mu-metal or another low eddy current loss material with high permeability. The film thickness is approximately 0.03 to 0.1 mm.

Die Folie muß schonend befestigt werden, um eine Schädigung des Werkstoffes durch übermäßige Erhitzung oder sonstige Beanspruchung auszuschließen. Die Befestigung kann durch Widerstandspunktschweißung, durch Ultraschallpunktschweißung oder durch Kleben erfolgen. Dabei darf die Erwärmung 300 °C nicht übersteigen. Dieses ist bei Verwendung einer Mikroelektrode gewährleistet.The film must be attached gently to prevent damage to the material due to excessive heating or other stress. The attachment can be done by resistance spot welding, by ultrasonic spot welding or by gluing. The warming must not exceed 300 ° C. This is guaranteed when using a microelectrode.

Ausführungsformen der Erfindung werden im folgenden unter Bezugnahme auf die anliegende Zeichnung erläutert, in der darstellen:

  • Fig. 1 einen Ausschnitt aus einem Zahnkranz nach der Erfindung,
  • Fig. 2 einen Axialschnitt durch den markierten Zahnkopf,
  • Fig. 3 einen Ausschnitt durch eine abgewandelte Ausfiihrungsform der Erfindung und
  • Fig. 4 eine weitere Abwandlung der Erfindung.
Embodiments of the invention are explained below with reference to the accompanying drawing, in which:
  • 1 shows a section of a ring gear according to the invention,
  • 2 shows an axial section through the marked tooth head,
  • 3 shows a detail through a modified embodiment of the invention and
  • Fig. 4 shows a further modification of the invention.

Fig. 1 zeigt einen Ausschnitt des Anlaßeinspurkranzes 1 für den nicht dargestellten Anlasser eines Verbrennungsmotors. Die Umfangsstirnflächen der Zahnköpfe 2 der Zähne 3 steht ein Zahnimpulssensor 4 gegenüber, an den ein Zahnimpulsgenerator 5 angeschlossen ist. Der Zahnimpulsgenerator erzeugt ein elektromagnetisches Hochfrequenzfeld, das mittels einer Spule innerhalb des Zahnimpulssensors 4 abgestrahlt wird. Das Feld durchsetzt die Zähne des Zahnkranzes. Entsprechend der Permeabilität der Zahnköpfe, die von Luft verschieden ist, bzw. der Wirbelstromverluste, erfolgt eine Modulation des Hochfrequenzfeldes. Diese Modulation kann ausgewertet werden, so daß dadurch eine Erzeugung von Zahnimpulsen möglich ist.Fig. 1 shows a section of the starter ring gear 1 for the starter of an internal combustion engine, not shown. The circumferential end faces of the tooth heads 2 of the teeth 3 are opposed by a tooth pulse sensor 4, to which a tooth pulse generator 5 is connected. The tooth pulse generator generates an electromagnetic high-frequency field, which is emitted by means of a coil within the tooth pulse sensor 4. The field penetrates the teeth of the ring gear. The high-frequency field is modulated in accordance with the permeability of the tooth tips, which is different from air, or the eddy current losses. This modulation can be evaluated, so that a generation tooth pulse is possible.

Ein Zahnkopf 6 ist markiert, so daß derselbe als Bezugszahnkopf zur Darstellung einer Bezugsphase benutzt werden kann. Und zwar weist dieser Zahnkopf 6 einen Axialschlitz 7 auf, der gegen die Stirnseite 8 des Anlaßeinspurkranzes 1 bzw. des Zahnkopfes 6 hin ansteigt, vgl. insbesondere Fig. 2. Der Axialschlitz kann an dieser Stirnseite 8 auf der Umfangsfläche des Zahnkopfes 6 auslaufen, so daß der Axialschlitz 7 die Stirnseite 8 nicht schneidet. Denn auf dieser Stirnseite 8 erfolgt die Einspurung des Ritzels des Anlassers.A tooth head 6 is marked so that it can be used as a reference tooth head to represent a reference phase. Namely, this tooth head 6 has an axial slot 7 which rises towards the end face 8 of the starter ring gear 1 or the tooth head 6, cf. 2 in particular. The axial slot can run out on this end face 8 on the peripheral surface of the tooth head 6, so that the axial slot 7 does not intersect the end face 8. Because on this end face 8 the pinion of the starter is engaged.

Der Axialschlitz 7 nimmt eine Einlage 9 auf, die dem Profil des Axialschlitzes 7 angepaßt ist und bei einem Axialschlitz der dargestellten Form keilförmig ausgebildet ist. Während der Zahnkranz selbst aus einem Material mit vergleichsweise hohen Wirbelstromverlusten besteht, weist der Werkstoff der Anlage 9 geringe Wirbelstromverluste auf. Es handelt sich z.B. um Weicheisen, Mu-Metall oder dergleichen. Infolgedessen erhält man im Zahnimpulssensor 4 für den markierten Zahkopf 6 ein deutlich abweichendes Signal, das entsprechend ausgewertet werden kann. Auf den Stirnflächen des Anlaßeinspurkranzes ist die Einlage 9 durch Schweißverbindungen 11 befestigt. Solche Schweißverbindungen dürfen auf der Umfangsfläche nicht vorhanden sein, damit die Wirbelstrombahnen unterbrochen sind.The axial slot 7 receives an insert 9 which is adapted to the profile of the axial slot 7 and is wedge-shaped in the case of an axial slot of the shape shown. While the ring gear itself consists of a material with comparatively high eddy current losses, the material of the system 9 has low eddy current losses. It is e.g. around soft iron, mu-metal or the like. As a result, a clearly deviating signal is obtained in the tooth pulse sensor 4 for the marked tooth head 6, which signal can be evaluated accordingly. The insert 9 is fastened to the end faces of the starter ring by welded connections 11. Such welded connections must not be present on the peripheral surface so that the eddy current paths are interrupted.

Als abweichende Materialeigenschaft kann auch die Permeabilität benutzt werden. Der Zahnkranz besteht normalerweise aus Eisen und hat infolgedessen eine relative Permeabilität von etwa 100. Die relative Permeabilität des Markierungsmaterials muß wesentlich größere Werte haben, etwa 250000 bis 500000. Solche Werkstoffe sind Mu-Metall, amorpges Metall, Ferrit.Permeability can also be used as a different material property. The ring gear is usually made of iron and, as a result, has a relative permeability of approximately 100. The relative permeability of the marking material must have substantially larger values, approximately 250,000 to 500,000. Such materials are mu-metal, amorphous metal, ferrite.

Speziell die Form des Axialschlitzes 7 mit ansteigender Fußfläche gewährleistet, daß auf der Stirnseite 8 keine Schwächung des Zahnkopfes 6 vorhanden ist, so daß keine Beschädigungen des Zahnkopfes beim Einspurvorgang des Anlassers zu befürchten sind.Specifically, the shape of the axial slot 7 with increasing foot surface ensures that there is no weakening of the tooth head 6 on the end face 8, so that no damage to the tooth head is to be feared during the starter engagement process.

Fig. 3 zeigt eine Ausführungsform, bei der die Einlage als gefaltetes Blechteil 10 ausgebildet ist, so daß die Wirbelstromverluste noch weiter herabgesetzt werden. Der in den Schlitz eingesetzte Blechteil kann zunächst mit Randstreifen 21 über die Schlitzränder überstehen. Jeweils die äußeren radialen Blechränder werden durch Schweißnähte 11 mit den Schlitzrändern verbunden. Nach dem Schweißen werden die Randstreifen 21 entfernt, so daß die Schweißnähte 11 und die Blechränder bündig mit den Schlitzrändern abschließen. Pie Randstreifen 21 verhindern ein Fließen des Schweißmittels in die Spalte zwischen den Blechstreifen. Infolgedessen ist eine sichere Sperrwirkung der Spalte für Wirbelströme gewährleistet. Die Einlage ist lediglich an den Stirnseiten mit dem Zahnkopf durch Schweißverbindungen 11 stoffshlüssig verbunden. Auf der Umfangsfläche des Zahnkopfes sind solche Schweißverbindungen nicht vorhanden, damit keine stoffschlüssige Verbindung zwischen den Flächen der Einlage 9 bzw. des Flächenteils 10 und dem Werkstoff des Zahnkopfes vorhanden ist. Das gefaltete Blechteil wirkt wie ein Transformatorblechpaket. Infolgedessen bleiben die geringen Wirbelstromverluste gewährelistet.Fig. 3 shows an embodiment in which the insert is designed as a folded sheet metal part 10, so that the eddy current losses are reduced even further. The sheet metal part inserted into the slot can initially protrude over the slot edges with edge strips 21. The outer radial sheet metal edges are connected to the slot edges by weld seams 11. After welding, the edge strips 21 are removed, so that the weld seams 11 and the sheet metal edges are flush with the slot edges. Pie border streak fen 21 prevent the welding agent from flowing into the gap between the metal strips. As a result, a safe blocking effect of the column for eddy currents is guaranteed. The insert is only cohesively connected to the tooth head at the end faces by welded connections 11. Such welded connections are not present on the peripheral surface of the tooth head, so that there is no integral connection between the surfaces of the insert 9 or the flat part 10 and the material of the tooth head. The folded sheet metal part acts like a transformer sheet pack. As a result, the low eddy current losses remain guaranteed.

Wenn man jedoch die Beeinflussung des Hochfrequenzfeldes durch die unterschiedliche Permeabilität auswertet, kann man auch auf der Kopffläche des Zahnkopfes Schweißnähte 11' vorsehen, um dadurch die mechanische Stabilität der Anordnung zu erhöhen.However, if one evaluates the influence of the high-frequency field by the different permeability, weld seams 11 'can also be provided on the top surface of the tooth head, in order to increase the mechanical stability of the arrangement.

Fig. 4 zeigt eine weitere Ausführungsfrom der Erfindung mit einer Folie 12, die durch Verbindungen 13 mit der Umfangsfläche des Zahnkopfes 6 verbunden ist. Die Folie 12 besteht aus amorphem Metall, Mu-Metall oder einem ühnlichen wirbelstromverlustarmen Werkstoff und hat eine Dicke von C,03 bis 0,1 mm. Sie kann durch Widerstandspunktschweißung auf dem Zahnkopf befestigt werden. Bei dieser Widerstandspunktschweißung kann die Temperaturbelastung der Folie niedrig gehalten werden, damit die magnetischen Eigenschaften des Markierungswerkstoffes nicht verändert werden. Man kann die Folie auch durch Kleben oder durch Ultraschallschweißung auf dem Zahnkopf befestigen.FIG. 4 shows a further embodiment of the invention with a film 12 which is connected to the peripheral surface of the tooth head 6 by connections 13. The film 12 consists of amorphous metal, mu-metal or a similar low eddy current loss material and has a thickness of C, 03 to 0.1 mm. It can be attached to the tooth head by resistance spot welding. With this resistance spot welding, the temperature load on the film can be kept low so that the magnetic properties of the marking material are not changed. The film can also be attached to the tooth head by gluing or by ultrasonic welding.

Insbesondere bei Verwendung einer Mikroelektrode ist gewährleistet, daß keine Erwärmung über 300 °C auftritt.In particular, when using a microelectrode, it is ensured that there is no heating above 300 ° C.

Claims (11)

1. Impulsgeberzahnkranz mit einem markierten Zahnkopf, dadurch gekennzeichnet, daß der markierte Zahnkopf (6) einen Bereich mit einem Werkstoff aufweist, dessen relative Permeabilität und/oder spezifische Wirbelstromverluste von denen des Zahnkranzes (1) selbst verschieden sind.1. pulse generator ring gear with a marked tooth head, characterized in that the marked tooth head (6) has an area with a material whose relative permeability and / or specific eddy current losses are different from those of the ring gear (1) itself. 2. Zahnkranz nach Anspruch 1, dadurch gekennzeichnet, daß der Werkstoff Weicheisen, Mu-Metall, amorphes Metall oder metallisches Glas ist.2. Sprocket according to claim 1, characterized in that the material is soft iron, mu-metal, amorphous metal or metallic glass. 3. Zahnkranz nach Anspruch 1, dadurch gekennzeichnet, daß der markierte Zahnkopf (6) einen Axialschlitz (7) aufweist, in den eine Einlage (9) aus dem genannten Werkstoff eingesetzt ist.3. Sprocket according to claim 1, characterized in that the marked tooth head (6) has an axial slot (7) into which an insert (9) made of the material mentioned is inserted. 4. Zahnkranz nach Anspruch 3, dadurch gekennzeichnet, daß die Schlitztiefe nach einer Stirnseite (8) des Zahnkranzes abnimmt.4. sprocket according to claim 3, characterized in that the slot depth decreases after an end face (8) of the sprocket. 5. Zahnkranz nach Anspruch 3, dadurch gekennzeichnet, daß die Einlage als U-förmig gefaltetes Blechteil (10) ausgebildet ist.5. sprocket according to claim 3, characterized in that the insert is designed as a U-shaped folded sheet metal part (10). 6. Zahnkranz nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß die Einlage an den Stirnseiten des Zahnkranzes mit den Scchlitzrändern verschweißt ist.6. sprocket according to one of claims 3 to 5, characterized in that the insert is welded to the end faces of the sprocket with the slot edges. 7. Zahnkranz nach Anspruch 5 und 6, dadurch gekennzeichnet, daß auch die axialen Längsränder der Einlage mit den Schlitzrändern verschweißt sind ( Fig. 3).7. Sprocket according to claim 5 and 6, characterized in that the axial longitudinal edges of the insert are welded to the slot edges (Fig. 3). 8. Zahnkranz nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß auf dem Zahnkopf (6) eine Folie (12) aus dem genannten Werkstoff befestigt ist.8. sprocket according to claim 1 or 2, characterized in that on the tooth head (6) a film (12) is attached from said material. 9. Zahnkranz nach Anspruch 8, dadurch gekennzeichnet, daß die Folie durch Widerstandspunktschweißung befestigt ist.9. sprocket according to claim 8, characterized in that the film is fixed by resistance spot welding. 10. Zahnkranz nach Anspruch 8, dadurch gekennzeichnet, daß die Folie durch Ultraschallpunktschweißung befestigt ist.10. sprocket according to claim 8, characterized in that the film is fixed by ultrasonic spot welding. 11. Zahnkranz nach Anspruch 8, dadurch gekennzeichnet, daß die Folie durch Kleben befestigt ist.11. Sprocket according to claim 8, characterized in that the film is attached by gluing.
EP82106828A 1981-08-06 1982-07-28 Flyweel gear pulse generator comprising a marked tooth Expired EP0071885B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106828T ATE30460T1 (en) 1981-08-06 1982-07-28 PULSE GEAR WITH A MARKED GEAR HEAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3131121A DE3131121C2 (en) 1981-08-06 1981-08-06 Tooth rim with a marked tooth tip
DE3131121 1981-08-06

Publications (3)

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EP0071885A2 true EP0071885A2 (en) 1983-02-16
EP0071885A3 EP0071885A3 (en) 1983-06-29
EP0071885B1 EP0071885B1 (en) 1987-10-28

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EP82106828A Expired EP0071885B1 (en) 1981-08-06 1982-07-28 Flyweel gear pulse generator comprising a marked tooth

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EP (1) EP0071885B1 (en)
JP (1) JPS5830618A (en)
AT (1) ATE30460T1 (en)
DE (2) DE3131121C2 (en)

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EP0225528A1 (en) * 1985-11-25 1987-06-16 Siemens Aktiengesellschaft Angular pulses identifying arrangement
WO1988001691A1 (en) * 1986-09-05 1988-03-10 Robert Bosch Gmbh Device for controlling an internal combustion engine
FR2779519A1 (en) * 1998-06-09 1999-12-10 Suisse Electronique Microtech INDUCTIVE MAGNETIC SENSOR WITH REFERENCE INDEX
WO2003002946A1 (en) * 2001-06-29 2003-01-09 Abb Ab Method to determine an angular position of a flywheel
FR3083572A1 (en) * 2018-07-06 2020-01-10 Continental Automotive France CRANKSHAFT TARGET WITH NUT TOOTH AND METHOD FOR SYNCHRONIZING AN INTERNAL COMBUSTION ENGINE
US11131567B2 (en) 2019-02-08 2021-09-28 Honda Motor Co., Ltd. Systems and methods for error detection in crankshaft tooth encoding
US11162444B2 (en) 2019-02-08 2021-11-02 Honda Motor Co., Ltd. Systems and methods for a crank sensor having multiple sensors and a magnetic element
US11181016B2 (en) 2019-02-08 2021-11-23 Honda Motor Co., Ltd. Systems and methods for a crank sensor having multiple sensors and a magnetic element
US11199426B2 (en) 2019-02-08 2021-12-14 Honda Motor Co., Ltd. Systems and methods for crankshaft tooth encoding
US11959820B2 (en) 2021-03-17 2024-04-16 Honda Motor Co., Ltd. Pulser plate balancing

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JPS6060024A (en) * 1983-09-09 1985-04-06 Nissan Motor Co Ltd Roll rigidity controller in vehicle
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DE3630271C2 (en) * 1986-09-05 1995-08-10 Bosch Gmbh Robert Device for controlling an internal combustion engine
DE4120984A1 (en) * 1990-06-26 1992-01-09 Mazda Motor Sensor with magnetic film on shaft element - has liquid contg. magnetic, bonding and solvent materials applied to non-magnetic film metal shaft element is rotated
DE10032061A1 (en) * 2000-07-01 2002-01-10 Alpha Getriebebau Gmbh gear
DE10135385B4 (en) * 2000-08-16 2005-06-02 Sew-Eurodrive Gmbh & Co. Kg Geared part and one or multi-stage planetary gear

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225528A1 (en) * 1985-11-25 1987-06-16 Siemens Aktiengesellschaft Angular pulses identifying arrangement
WO1988001691A1 (en) * 1986-09-05 1988-03-10 Robert Bosch Gmbh Device for controlling an internal combustion engine
US4848298A (en) * 1986-09-05 1989-07-18 Robert Bosch Gmbh Device for controlling internal combustion engine
FR2779519A1 (en) * 1998-06-09 1999-12-10 Suisse Electronique Microtech INDUCTIVE MAGNETIC SENSOR WITH REFERENCE INDEX
EP0964225A1 (en) * 1998-06-09 1999-12-15 CSEM Centre Suisse d'Electronique et de Microtechnique S.A. - Recherche et Développement Inductive magnetic sensor with reference index
WO2003002946A1 (en) * 2001-06-29 2003-01-09 Abb Ab Method to determine an angular position of a flywheel
FR3083572A1 (en) * 2018-07-06 2020-01-10 Continental Automotive France CRANKSHAFT TARGET WITH NUT TOOTH AND METHOD FOR SYNCHRONIZING AN INTERNAL COMBUSTION ENGINE
US11131567B2 (en) 2019-02-08 2021-09-28 Honda Motor Co., Ltd. Systems and methods for error detection in crankshaft tooth encoding
US11162444B2 (en) 2019-02-08 2021-11-02 Honda Motor Co., Ltd. Systems and methods for a crank sensor having multiple sensors and a magnetic element
US11181016B2 (en) 2019-02-08 2021-11-23 Honda Motor Co., Ltd. Systems and methods for a crank sensor having multiple sensors and a magnetic element
US11199426B2 (en) 2019-02-08 2021-12-14 Honda Motor Co., Ltd. Systems and methods for crankshaft tooth encoding
US11959820B2 (en) 2021-03-17 2024-04-16 Honda Motor Co., Ltd. Pulser plate balancing

Also Published As

Publication number Publication date
DE3277541D1 (en) 1987-12-03
JPS5830618A (en) 1983-02-23
ATE30460T1 (en) 1987-11-15
EP0071885A3 (en) 1983-06-29
EP0071885B1 (en) 1987-10-28
DE3131121C2 (en) 1984-11-15
DE3131121A1 (en) 1983-02-24

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