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EP1567825B1 - Device for measuring the lift of poppet valves - Google Patents

Device for measuring the lift of poppet valves Download PDF

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Publication number
EP1567825B1
EP1567825B1 EP03810389A EP03810389A EP1567825B1 EP 1567825 B1 EP1567825 B1 EP 1567825B1 EP 03810389 A EP03810389 A EP 03810389A EP 03810389 A EP03810389 A EP 03810389A EP 1567825 B1 EP1567825 B1 EP 1567825B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
poppet valves
groove
shank
measuring
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.)
Expired - Lifetime
Application number
EP03810389A
Other languages
German (de)
French (fr)
Other versions
EP1567825A1 (en
Inventor
Rudolf Kragl
Rolf Connert
Martin Lorscheid
Till Scheffler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1567825A1 publication Critical patent/EP1567825A1/en
Application granted granted Critical
Publication of EP1567825B1 publication Critical patent/EP1567825B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L1/462—Valve return spring arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/04—Sensors
    • F01L2820/045—Valve lift
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator
    • Y10T137/8242—Electrical

Definitions

  • the invention relates to a device referred to in the preamble of claim 1. Art.
  • Such a device is known from DE 37 03 867 A1 known.
  • a sleeve is preferably made of magnetic material glued to measure the valve lift in the groove in the valve stem. Groove and sleeve are coordinated so that the sleeve sits flush in the valve stem, ie radially does not protrude. Extremely high loads can lead to bending vibrations of the valve stem.
  • Other devices are out WO 00/65204 .
  • the object of the invention is to develop a device of the type mentioned in such a way that it allows a reliable statement about the actual axial movement of the valve even under extreme loads.
  • the solution has the advantage that mechanical deformations of the sleeve are largely avoided by axially pending parts of the valve stem. Magnetostriction effects, which can occur with a sleeve made of magnetic material, thus remain largely as much as impairments of the eddy current characteristics, as they occur in a non-magnetic, metallic sleeve, which is exposed to an alternating field.
  • claim 4 describes a way to reduce the axial play between sleeve and shaft by a local change of the rectangular geometry in the potential contact zone and to optimize the stability of the shaft.
  • a detail of a cylinder head 1 of a reciprocating internal combustion engine with a gas guide channel 2 and a globe valve 3 is shown.
  • the lift valve 3 is shown in sections with its valve stem 3 '. It is controlled in a known, not interesting way here. For this purpose it is equipped with also not shown valve springs and a valve spring plate.
  • the valve stem 3 ' has a groove 4, in which a sleeve 5 is attached made of magnetic material
  • the sleeve 5 runs in a stationary coil 6, which surrounds the sleeve 5 during the entire stroke movement and thereby induces an alternating voltage, from which the position of the sleeve 5 and thus of the lifting valve 3 is determined in a known manner.
  • the sleeve 5 is fixed within the groove 4 with axial play.
  • the game is axially formed on both sides.
  • the game is dimensioned such that the sleeve 5 is not applied to the axially adjacent parts of the valve stem 3 'at all occurring operating temperatures and operating stresses.
  • the sleeve 5 is mechanically not deformed by the axially adjacent parts of the valve stem 3 'with the advantage of a position information that is undisturbed and allows an exact statement about the position of the globe valve 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The invention relates to a device for measuring the lift of poppet valves, in particular for poppet valves built into a internal combustion engines, by means of an inductive displacement sensor, comprising a fixed coil and a metal sleeve bound in a groove in the valve stem which may be axially displaced within the coil, whereby the sleeve is fixed within the groove with axial play.

Description

Die Erfindung bezieht sich auf eine Vorrichtung der im Oberbegriff des Patentanspruchs 1 genannten Art.The invention relates to a device referred to in the preamble of claim 1. Art.

Eine derartige Vorrichtung ist aus der DE 37 03 867 A1 bekannt. Dort wird zum Messen der Ventilhubbewegung in die Nut im Ventilschaft eine Hülse vorzugsweise aus magnetischem Werkstoff eingeklebt. Nut und Hülse sind so aufeinander abgestimmt, dass die Hülse bündig im Ventilschaft sitzt, d.h. radial nicht hervorsteht. Bei extrem hohen Belastungen kann es zu Biegeschwingungen des Ventilschafts kommen. Weitere Vorrichtungen sind aus WO 00/65204 , DE 42 38 861 A1 , und DE 44 38 059 A1 bekannt.Such a device is known from DE 37 03 867 A1 known. There, a sleeve is preferably made of magnetic material glued to measure the valve lift in the groove in the valve stem. Groove and sleeve are coordinated so that the sleeve sits flush in the valve stem, ie radially does not protrude. Extremely high loads can lead to bending vibrations of the valve stem. Other devices are out WO 00/65204 . DE 42 38 861 A1 , and DE 44 38 059 A1 known.

Aufgabe der Erfindung ist es, eine Vorrichtung der eingangs genannten Art dahingehend weiterzubilden, dass sie auch bei extremen Belastungen eine zuverlässige Aussage über die tatsächliche axiale Bewegung des Ventils ermöglicht.The object of the invention is to develop a device of the type mentioned in such a way that it allows a reliable statement about the actual axial movement of the valve even under extreme loads.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst. Die Lösung hat den Vorteil, dass mechanische Verformungen der Hülse durch axial anstehende Teile des Ventilschafts weitgehend vermieden werden. Magnetostriktionseffekte, wie sie bei einer Hülse aus magnetischem Werkstoff auftreten können, bleiben damit ebenso weitgehend aus wie Beeinträchtigungen der Wirbelstromeigenschaften, wie sie bei einer nicht-magnetischen, metallischen Hülse auftreten, die einem Wechselfeld ausgesetzt ist.This object is achieved by the features of claim 1. The solution has the advantage that mechanical deformations of the sleeve are largely avoided by axially pending parts of the valve stem. Magnetostriction effects, which can occur with a sleeve made of magnetic material, thus remain largely as much as impairments of the eddy current characteristics, as they occur in a non-magnetic, metallic sleeve, which is exposed to an alternating field.

Die Patentansprüche 2 und 3 beschreiben vorteilhafte Weiterbildungen der Erfindung, durch die etwaig unter ganz extremen Bedingungen noch auftretende Beeinträchtigungen der magnetischen bzw. elektrischen Eigenschaften der Hülse völlig vermieden werden.The claims 2 and 3 describe advantageous developments of the invention by which any under extreme conditions still occurring impairments of the magnetic or electrical properties of the sleeve are completely avoided.

Schließlich beschreibt der Patentanspruch 4 eine Möglichkeit, durch eine lokale Veränderung der Rechteckgeometrie in der potentiellen Kontaktzone das axiale Spiel zwischen Hülse und Schaft zu verringern und die Stabilität des Schafts zu optimieren.Finally, claim 4 describes a way to reduce the axial play between sleeve and shaft by a local change of the rectangular geometry in the potential contact zone and to optimize the stability of the shaft.

Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels näher dargestellt.In the following, the invention will be described in more detail with reference to an embodiment.

In der einzigen Abbildung ist ein Ausschnitt aus einem Zylinderkopf 1 einer Hubkolbenbrennkraftmaschine mit einem Gasführungskanal 2 und einem Hubventil 3 dargestellt. Das Hubventil 3 ist ausschnittsweise mit seinem Ventilschaft 3' gezeigt. Es wird in bekannter, hier nicht näher interessierender Weise gesteuert. Hierzu ist es mit ebenfalls nicht dargestellten Ventilfedern und einem Ventilfederteller ausgerüstet.In the single figure, a detail of a cylinder head 1 of a reciprocating internal combustion engine with a gas guide channel 2 and a globe valve 3 is shown. The lift valve 3 is shown in sections with its valve stem 3 '. It is controlled in a known, not interesting way here. For this purpose it is equipped with also not shown valve springs and a valve spring plate.

Der Ventilschaft 3' weist eine Nut 4 auf, in der eine Hülse 5 aus magnetischem Material befestigt istThe valve stem 3 'has a groove 4, in which a sleeve 5 is attached made of magnetic material

Die Hülse 5 läuft in einer feststehenden Spule 6, die die Hülse 5 während der gesamten Hubbewegung umgibt und induziert dabei eine Wechselspannung, aus der auf bekannte Weise die Stellung der Hülse 5 und damit des Hubventils 3 bestimmt wird.The sleeve 5 runs in a stationary coil 6, which surrounds the sleeve 5 during the entire stroke movement and thereby induces an alternating voltage, from which the position of the sleeve 5 and thus of the lifting valve 3 is determined in a known manner.

Die Hülse 5 ist innerhalb der Nut 4 mit axialem Spiel befestigt ist. Das Spiel ist axial beidseitig ausgebildet.The sleeve 5 is fixed within the groove 4 with axial play. The game is axially formed on both sides.

Das Spiel ist derart bemessen, dass die Hülse 5 bei allen auftretenden Betriebstemperaturen und Betriebsbeanspruchungen nicht an den axial benachbarten Teilen des Ventilschafts 3' anliegt.The game is dimensioned such that the sleeve 5 is not applied to the axially adjacent parts of the valve stem 3 'at all occurring operating temperatures and operating stresses.

Nicht dargestellt ist eine besondere Ausführungsform der Erfindung, bei der die Hülse und/oder der Schaft an ihrem Außenumfang in dem zum Schaft bzw. der Hülse benachbarten Bereich eingezogen ist/sind. Dadurch kann das axiale Spiel gegenüber der dargestellten Ausführungsform verringert werden.Not shown is a particular embodiment of the invention, in which the sleeve and / or the shaft is retracted at its outer periphery in the region adjacent to the shaft or the sleeve / are. Thereby, the axial play can be reduced compared to the illustrated embodiment.

Sämtlichen Ausführungsformen gemeinsam ist, dass die Hülse 5 durch die axial benachbarten Teile des Ventilschafts 3' mechanisch nicht verformt wird mit dem Vorteil einer Stellungsinformation, die ungestört ist und eine exakte Aussage über die Stellung des Hubventils 3 erlaubt.Common to all embodiments is that the sleeve 5 is mechanically not deformed by the axially adjacent parts of the valve stem 3 'with the advantage of a position information that is undisturbed and allows an exact statement about the position of the globe valve 3.

Claims (4)

  1. A device for measuring the travel of poppet valves, especially poppet valves incorporated in internal combustion engines, using inductive motion sensors, the device comprising a non-displaceably mounted coil (6) and a metal sleeve (5) disposed flush in a groove (4) in the valve shank (3') and axially movable in the coil, characterised in that the sleeve in the groove is fastened with axial clearance.
  2. A device according to claim 1, characterised in that the clearance is axial on both sides.
  3. A device according to claim 1 or 2, characterised in that the clearance is dimensioned so that the sleeve does not touch the shank under any temperatures or stresses occurring in operation.
  4. A device according to any of claims 1 to 3, characterised in that the outer periphery of the sleeve and/or shank is/are constricted in the region adjoining the sleeve or shank.
EP03810389A 2002-11-06 2003-08-07 Device for measuring the lift of poppet valves Expired - Lifetime EP1567825B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10251664 2002-11-06
DE2002151664 DE10251664A1 (en) 2002-11-06 2002-11-06 Valve stroke measurement device, especially for a combustion engine, has an inductive path sensor with a flush magnetic metallic housing integrated in the valve shaft with a degree of axial play so that a fixed coil detects it
PCT/EP2003/008740 WO2004042318A1 (en) 2002-11-06 2003-08-07 Device for measuring the lift of poppet valves

Publications (2)

Publication Number Publication Date
EP1567825A1 EP1567825A1 (en) 2005-08-31
EP1567825B1 true EP1567825B1 (en) 2007-07-18

Family

ID=32115296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03810389A Expired - Lifetime EP1567825B1 (en) 2002-11-06 2003-08-07 Device for measuring the lift of poppet valves

Country Status (5)

Country Link
US (1) US7121300B2 (en)
EP (1) EP1567825B1 (en)
JP (1) JP2006504959A (en)
DE (2) DE10251664A1 (en)
WO (1) WO2004042318A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1925904B1 (en) 2006-11-21 2009-05-06 C.R.F. Società Consortile per Azioni Method and device for determining the relative position of two elements that are mobile with respect to one another
WO2009008523A1 (en) * 2007-07-12 2009-01-15 Imagineering, Inc. Internal combustion engine
DE102009036061B3 (en) * 2009-08-04 2011-02-10 Mtu Friedrichshafen Gmbh Method for controlling and regulating an internal combustion engine
US9068815B1 (en) * 2011-11-09 2015-06-30 Sturman Industries, Inc. Position sensors and methods
SE536617C2 (en) 2012-06-28 2014-04-01 Cargine Engineering Ab Method and positioning sensor composition for determining a mutual position between a first object and another object
SE537654C2 (en) * 2013-12-20 2015-09-22 Freevalve Ab Method and position sensor composition for determining the relative position between a first object and a second object
FR3069040B1 (en) * 2017-07-17 2020-09-11 Renault Sas ARRANGEMENT FOR VALVE TEMPERATURE MEASUREMENT

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3703867A1 (en) * 1987-02-07 1988-08-18 Bayerische Motoren Werke Ag Device for measuring the displacement of reciprocating valves
US5144977A (en) * 1991-06-20 1992-09-08 Dresser Industries, Inc. Fluid valve with actuation sensor
DE4238861C2 (en) * 1992-01-30 1995-08-31 Daimler Benz Ag Device for determining the position of an axially movable body
DE4438059C2 (en) * 1993-11-05 2002-06-06 Volkswagen Ag Device for the measurement of valve lifting movements
DE19841660C2 (en) * 1998-09-11 2003-07-10 Audi Ag Arrangement for the contactless measurement of valve movements in internal combustion engines
FR2792765B1 (en) * 1999-04-23 2001-07-27 Sagem ELECTROMAGNETIC LINEAR ACTUATOR WITH POSITION SENSOR

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1567825A1 (en) 2005-08-31
WO2004042318A1 (en) 2004-05-21
US20050241699A1 (en) 2005-11-03
DE50307731D1 (en) 2007-08-30
DE10251664A1 (en) 2004-05-19
US7121300B2 (en) 2006-10-17
JP2006504959A (en) 2006-02-09

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