DE102014220171A1 - Device for preventing deposition of ferromagnetic particles - Google Patents
Device for preventing deposition of ferromagnetic particles Download PDFInfo
- Publication number
- DE102014220171A1 DE102014220171A1 DE102014220171.3A DE102014220171A DE102014220171A1 DE 102014220171 A1 DE102014220171 A1 DE 102014220171A1 DE 102014220171 A DE102014220171 A DE 102014220171A DE 102014220171 A1 DE102014220171 A1 DE 102014220171A1
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- DE
- Germany
- Prior art keywords
- sensor unit
- induction
- sensor
- ferromagnetic particles
- permanent magnet
- 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.)
- Pending
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- 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
- G01D5/20—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 by varying inductance, e.g. by a movable armature
-
- 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
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/08—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
-
- 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
- G01D5/20—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 by varying inductance, e.g. by a movable armature
- G01D5/22—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 by varying inductance, e.g. by a movable armature differentially influencing two coils
- G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils
-
- 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
- G01D5/24428—Error prevention
- G01D5/24433—Error prevention by mechanical means
- G01D5/24438—Special design of the sensing element or scale
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Vorrichtung zur Verhinderung einer Ablagerung von ferromagnetischen Partikeln (6) zwischen einem Induktionsgeber (4) mit mindestens einem Permanentmagneten (8) und einer Sensoreinheit (2), wobei die Vorrichtung aus mindestens einem Toleranzausgleichselement (26) besteht, welches einen Spalt (12) zwischen dem Induktionsgeber (4) und der Sensoreinheit (2) reduziert oder füllt.Device for preventing deposition of ferromagnetic particles (6) between an induction transmitter (4) with at least one permanent magnet (8) and a sensor unit (2), the device consisting of at least one tolerance compensation element (26) which interposes a gap (12) between the induction transmitter (4) and the sensor unit (2) reduces or fills.
Description
Die Erfindung betrifft eine Vorrichtung und ein zugehöriges Verfahren zur Verhinderung einer Ablagerung von ferromagnetischen Partikeln zwischen einem Induktionsgeber mit mindestens einem Permanentmagneten und einer Sensoreinheit sowie ein Getriebe mit einer entsprechenden Vorrichtung gemäß dem Oberbegriff der Patentansprüche 1, 6 und 7. The invention relates to a device and an associated method for preventing deposition of ferromagnetic particles between an induction sensor with at least one permanent magnet and a sensor unit and a transmission with a corresponding device according to the preamble of
Sensoren und zugehörige Geberelemente werden heute in den verschiedensten technischen Anwendungsbereichen eingesetzt. Einer dieser Bereiche ist z.B. in Schaltgetrieben, bei denen die Zahnräder über Schaltgabeln geschaltet werden, die mit manuell, halbautomatisch oder automatisch betätigten, längs verschiebbaren Schaltschienen verbunden sind. Die Sensoren sind z.B. Wegsensor zur Erfassung von Schaltpositionen in diesen Getrieben. Der mittels induktiver Wegsensoranordnung erfasste Verschiebeweg einer Schaltschiene wird als Wegsignal in einer Funktionssteuerung weiterverarbeitet, beispielsweise um zu prüfen, ob die Schaltung des Getriebes erfolgreich durchgeführt wurde. Als Wegsensoren werden oft induktive Wegsensoranordnungen z.B. mit der Sensortechnologie LVDT eingesetzt, welche als Geberelement einen Induktivgeber mit mindestens einem Permanentmagneten benötigen. Sensors and associated encoder elements are used today in a wide variety of technical applications. One of these areas is e.g. in manual transmissions, in which the gears are connected via shift forks, which are connected to manually, semi-automatically or automatically operated, longitudinally displaceable shift rails. The sensors are e.g. Position sensor for detecting shift positions in these transmissions. The detected by inductive displacement sensor arrangement displacement of a shift rail is further processed as a path signal in a function control, for example, to check whether the circuit of the transmission has been carried out successfully. As displacement sensors inductive displacement sensor arrangements are often used e.g. used with the sensor technology LVDT, which require as an encoder element an inductive transmitter with at least one permanent magnet.
In einigen Getrieben werden die Wegsensoren außerhalb des Getriebeölraums platziert. Allerdings gibt es ebenfalls Getriebe, bei denen die Wegsensoren innerhalb des Getriebeölraums angeordnet sind. Der Induktionsgeber mit Permanentmagnet kann in dieser Getriebeanwendung auf der Schaltschiene fixiert und die Sensoreinheit mit dem Getriebegehäuse verschraubt werden. Dabei entsteht ein Luftspalt zwischen Induktionsgeber und Sensoreinheit. Dieser Luftspalt kann aufgrund der Positionierung auf der Schaltschiene variabel sein. In some transmissions, the displacement sensors are placed outside the transmission oil space. However, there are also transmissions in which the displacement sensors are located within the transmission oil space. The induction magnet with permanent magnet can be fixed in this gear application on the shift rail and the sensor unit can be screwed to the transmission housing. This creates an air gap between induction sensor and sensor unit. This air gap may be variable due to the positioning on the shift rail.
Im Getriebeöl bilden sich aufgrund von Abrieb ferromagnetische Späne bzw. Partikel. Diese ferromagnetischen Späne bzw. Partikel werden durch den Permanentmagneten des Induktionsgebers zur Positionserfassung angezogen und das Ferromagnetic chips or particles form in the gear oil due to abrasion. These ferromagnetic chips or particles are attracted by the permanent magnet of the induction sensor for position detection and the
Magnetfeld der Permanentmagneten wird dadurch geschwächt. Aufgrund dessen kann es zu einer Beeinflussung des Positionssignals kommen. Dies äußert sich z.B. in ungenauen bzw. ungültigen Positionssignalen. Magnetic field of the permanent magnet is thereby weakened. Due to this, there may be an influence on the position signal. This manifests itself e.g. in inaccurate or invalid position signals.
Aus der Schrift
Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung sowie ein Verfahren zur Verhinderung einer Ablagerung von ferromagnetischen Partikeln zwischen einem Induktionsgeber mit mindestens einem Permanentmagneten und einer Sensoreinheit sowie ein Getriebe mit einer entsprechenden Vorrichtung zu schaffen. Against this background, the invention has for its object to provide a device and a method for preventing a deposition of ferromagnetic particles between an induction sensor with at least one permanent magnet and a sensor unit and a transmission with a corresponding device.
Die Lösung der Aufgabe ergibt sich aus den Merkmalen der unabhängigen Ansprüche 1, 6 und 7, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den diesen Ansprüchen jeweils nachgeordneten abhängigen Ansprüchen entnehmbar sind. The solution of the problem arises from the features of the
Der Erfindung liegt die Erkenntnis zugrunde, wonach die oben beschriebene Aufgabe am besten dadurch lösbar ist, dass eine Vorrichtung zur Verhinderung einer Ablagerung von ferromagnetischen Partikeln zwischen einem Induktionsgeber mit mindestens einem Permanentmagneten und einer Sensoreinheit vorgeschlagen wird, wobei die Vorrichtung aus mindestens einem Toleranzausgleichselement besteht, welches den Spalt bzw. Abstand zwischen dem Induktionsgeber und der Sensoreinheit reduziert oder füllt. Das Toleranzausgleichselement ist bevorzugt aus einem elastischen Material. Durch dieses Toleranzausgleichselement aus einem elastischen, komprimierbaren, geeigneten Material wird der Induktionsgeber bzw. der Permanentmagnet zumindest teilweise abgedeckt, der Spalt zwischen Sensoreinheit und Induktionsgeber wird ganz oder teilweise gefüllt und eine Ansammlung bzw. Ablagerung von ferromagnetischen Partikeln auf der Oberfläche des Induktionsgebers bzw. des Permanentmagneten oder auch der Sensoreinheit kann verringert oder verhindert werden. The invention is based on the finding that the object described above is best solved by proposing a device for preventing deposition of ferromagnetic particles between an induction transmitter having at least one permanent magnet and a sensor unit, wherein the device consists of at least one tolerance compensation element, which reduces or fills the gap between the induction transmitter and the sensor unit. The tolerance compensation element is preferably made of an elastic material. Through this tolerance compensation element made of an elastic, compressible, suitable material of the induction sensor or the permanent magnet is at least partially covered, the gap between the sensor unit and induction sensor is completely or partially filled and an accumulation or deposition of ferromagnetic particles on the surface of the induction sensor or Permanent magnets or the sensor unit can be reduced or prevented.
Es wird bevorzugt ein elastisches Material eingesetzt, da die Dynamik bzw. der Verschleiß von mechanischen Teilen (z.B. bei der Lagerung der Schaltschienen) über die Lebensdauer gesehen zu variablen Auslenkungen führen. Es können auch verschiedene geeignete Materialien kombiniert werden. Außerdem ist eine unterschiedliche Formgebung für das Toleranzausgleichselement denkbar bzw. können mehrere Toleranzausgleichselemente direkt nebeneinander angeordnet sein. Es ist darauf zu achten, dass das Material auch den erforderlichen Umweltbedingungen im Ölraum standhält. Außerdem soll eine Kraftübertragung vom Induktionsgeber durch das Toleranzausgleichselement auf die Sensoreinheit weitgehend vermieden bzw. minimiert werden. An elastic material is preferably used, since the dynamics or the wear of mechanical parts (eg during the mounting of the shift rails) over the service life lead to variable deflections. Various suitable materials can also be combined. In addition, a different shape for the tolerance compensation element is conceivable or more tolerance compensation elements can be arranged directly next to each other. It must be ensured that the material also withstands the required environmental conditions in the oil room. In addition, a force transmission from the induction generator by the tolerance compensation element on the sensor unit should be largely avoided or minimized.
Das Toleranzausgleichselement aus elastischem Material kann direkt oder indirekt an einer Oberfläche einer Sensoreinheit oder an einer Oberfläche eines Induktionsgebers befestigt werden. Die Befestigung kann z.B. durch Verkleben stattfinden. Als geeignete elastische Materialien können zum Beispiel Vlieswerkstoffe eingesetzt werden. The tolerance compensation element of elastic material can be attached directly or indirectly to a surface of a sensor unit or to a surface of an induction sensor. The attachment may e.g. take place by gluing. As suitable elastic materials, for example nonwoven materials can be used.
Zur weiteren Verdeutlichung der Erfindung sind Ausführungsbeispiele beigefügt. To further illustrate the invention embodiments are attached.
In
Um das Toleranzausgleichselement
Um das Toleranzausgleichselement
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 22
- Sensoreinheit sensor unit
- 44
- Induktionsgeber Proximity switches
- 66
- Ansammlung ferromagnetischer Partikel Collection of ferromagnetic particles
- 88th
- Permanentmagnet permanent magnet
- 1010
- Bewegungsrichtung des Induktionsgebers Direction of movement of the induction transmitter
- 1212
- Spalt gap
- 1414
- Magnetfeldlinien magnetic field lines
- 1616
- primäre Spule primary coil
- 1818
- sekundäre Spule secondary coil
- 2020
- Sättigungsbereich saturation
- 2222
- Magnetfeldlinien im Bereich der Partikelansammlung Magnetic field lines in the area of particle accumulation
- 2424
- Sättigungsstab saturation bar
- 2626
- Toleranzausgleichselement Tolerance compensation element
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102009039447 A1 [0006] DE 102009039447 A1 [0006]
Claims (7)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE102014220171.3A DE102014220171A1 (en) | 2014-10-06 | 2014-10-06 | Device for preventing deposition of ferromagnetic particles |
PCT/EP2015/070315 WO2016055219A1 (en) | 2014-10-06 | 2015-09-07 | Apparatus for preventing a deposition of ferromagnetic particles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014220171.3A DE102014220171A1 (en) | 2014-10-06 | 2014-10-06 | Device for preventing deposition of ferromagnetic particles |
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DE102014220171A1 true DE102014220171A1 (en) | 2016-04-07 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE102014220171.3A Pending DE102014220171A1 (en) | 2014-10-06 | 2014-10-06 | Device for preventing deposition of ferromagnetic particles |
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DE (1) | DE102014220171A1 (en) |
WO (1) | WO2016055219A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016205162A1 (en) | 2016-03-30 | 2017-10-05 | Zf Friedrichshafen Ag | Protective device, magnetic sensor device and gearbox device |
DE102019109972A1 (en) * | 2019-04-16 | 2020-10-22 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Position detection unit, clutch actuator with position detection unit and vehicle coupling with position detection unit |
DE102019214874A1 (en) * | 2019-09-27 | 2021-04-01 | Zf Friedrichshafen Ag | Method and control device for operating a transmission |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009039447A1 (en) | 2009-08-31 | 2011-03-03 | Daimler Ag | Surface cleaning method for e.g. fill level sensor of drain valve in fuel cell system that is utilized for supplying drive energy for motor vehicle e.g. aircraft, involves moving surfaces of sensor against wiping element to clean surfaces |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10132215A1 (en) * | 2001-07-03 | 2003-01-23 | Philips Corp Intellectual Pty | Arrangement for measuring the angular position of an object |
JP2006177676A (en) * | 2004-12-20 | 2006-07-06 | Aisin Seiki Co Ltd | Displacement detector |
GB2506698A (en) * | 2012-10-02 | 2014-04-09 | Mark Anthony Howard | Detector to measure the relative position of bodies |
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2014
- 2014-10-06 DE DE102014220171.3A patent/DE102014220171A1/en active Pending
-
2015
- 2015-09-07 WO PCT/EP2015/070315 patent/WO2016055219A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009039447A1 (en) | 2009-08-31 | 2011-03-03 | Daimler Ag | Surface cleaning method for e.g. fill level sensor of drain valve in fuel cell system that is utilized for supplying drive energy for motor vehicle e.g. aircraft, involves moving surfaces of sensor against wiping element to clean surfaces |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016205162A1 (en) | 2016-03-30 | 2017-10-05 | Zf Friedrichshafen Ag | Protective device, magnetic sensor device and gearbox device |
DE102019109972A1 (en) * | 2019-04-16 | 2020-10-22 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Position detection unit, clutch actuator with position detection unit and vehicle coupling with position detection unit |
DE102019214874A1 (en) * | 2019-09-27 | 2021-04-01 | Zf Friedrichshafen Ag | Method and control device for operating a transmission |
Also Published As
Publication number | Publication date |
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WO2016055219A1 (en) | 2016-04-14 |
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