EP1375845A1 - Actionneur de soupapes sans arbre à cames avec détecteur de position de la tige de soupape - Google Patents

Actionneur de soupapes sans arbre à cames avec détecteur de position de la tige de soupape Download PDF

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Publication number
EP1375845A1
EP1375845A1 EP03011134A EP03011134A EP1375845A1 EP 1375845 A1 EP1375845 A1 EP 1375845A1 EP 03011134 A EP03011134 A EP 03011134A EP 03011134 A EP03011134 A EP 03011134A EP 1375845 A1 EP1375845 A1 EP 1375845A1
Authority
EP
European Patent Office
Prior art keywords
plunger
target
actuator
assembly according
connecting layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03011134A
Other languages
German (de)
English (en)
Inventor
Petra Klingenbrunn
Vinh Nguyen
Ewald Jördens
Walter Strzoda
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.)
TRW Deutschland GmbH
Original Assignee
TRW Deutschland 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 TRW Deutschland GmbH filed Critical TRW Deutschland GmbH
Publication of EP1375845A1 publication Critical patent/EP1375845A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2167—Sensing means
    • F01L2009/2169—Position sensors
    • 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
    • F01L2303/00—Manufacturing of components used in valve 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
    • F01L2800/00—Methods of operation using a variable valve timing mechanism

Definitions

  • the invention relates to an assembly consisting of an oscillating moving plunger and a target attached to the outer periphery of the plunger for generating position signals, the target in a circumferential groove in the Tappet added and manufactured by means of soldering or gluing Connection layer is connected to the plunger.
  • the invention further relates to a camshaft-less actuator containing the assembly for actuation of a lift valve of an internal combustion engine.
  • the camshaftless valve trains are often electromagnetic Actuators. So that the plunger can be positioned exactly, it is necessary to determine its position as precisely as possible. So-called targets are used for this the plungers provided, the positions of which are designed accordingly Sensors can be determined. So far, so-called Copper targets used. For this purpose, a groove in the ram is filled with copper. Then the plunger is usually machined on the outside so that the Copper-filled area without a step into the adjacent outer surface of the plunger transforms.
  • an actuator in which The outer circumference of the plunger is at least simply slotted, as a separate, Prefabricated part trained target ring is attached, which is made of one material Fe-based or made of a ferritic material and in one on the plunger formed circumferential groove is inserted.
  • a target ring based on Fe or consists of a ferritic material a sensor can be used that works with lower frequencies than with a target made of copper.
  • the invention provides an actuator that operates largely without interference signals, which enables an exact position determination by the assigned sensor and thus the life of the valve train via improved control elevated.
  • an assembly is provided according to the invention, which consists of a oscillating plunger and one on the outer periphery of the plunger fixed target for generating position signals, especially for a camshaftless actuator of an internal combustion engine, the target in a circumferential groove in the plunger and by means of soldering or Adhesive connection layer produced is connected to the plunger, and the is characterized in that the connection layer to the mechanical Decoupling of the plunger and the target is designed to be force-isolating.
  • connection layer is achieved by vibrations and other external forces occurring no longer from the ram to the Target transferred but already taken up by the connection layer and be absorbed.
  • the occurrence of interference signals by a time-dependent change of the magnetic properties of the target safely prevented and the target mechanically and magnetically decoupled from the plunger.
  • the force-insulating design of the connection layer is preferred thereby achieves that the connecting layer has a porosity, the porosity, measured as the ratio between pore volume and sample volume, preferred is at least about 10%, particularly preferably at least about 30%. Due to the porosity introduced into the connection layer, in particular simply increases the elasticity of the layer and a vibration-damping effect can be achieved.
  • the introduction of a porosity into the connection layer for example, by using Blowing agents or sacrificial materials during the manufacture of the solder or Adhesive connection, as in principle in the manufacture of Foams is known.
  • the assembly according to the invention particularly preferably has a Connection layer on which the target against the transmission of train and Compressive stresses isolated.
  • the invention also relates to a camshaftless actuator for Actuation of a lift valve of an internal combustion engine, with an oscillating one moved, coupled to the stroke valve tappet, the inventive Contains assembly.
  • the actuator is preferably an electromagnetic one Actuator with one or two coils.
  • the plunger forms the anchor shaft. This actuates the valve stem and is coupled to the valve stem or possibly even connected in one piece.
  • a sensor can be located in the actuator near the preferably ring-shaped target be provided, the location, speed or acceleration of the Target rings and thus the ram detected.
  • the target ring can consist of two or more in a known manner adjacent ring segments, preferably circular ring segments, be composed, which can form separate, prefabricated parts.
  • This Embodiment offers the advantage that the target ring is not when fastening must be elastically deformed, but that the segments from radially outside of the seat on the plunger is simply inserted into the circumferential groove and by means of the solder or adhesive connection can be attached.
  • the target preferably consists of a ferritic iron alloy, steel or another ferritic material, such as that from DE 201 15 060 U1 is known.
  • ferritic alloys allows the exact Position determination and thus increases the signal accuracy.
  • the plunger or Anchor shaft can be made of non-magnetic, martensitic or austenitic Materials or alloys are formed. Because of their stability and Austenitic alloys are particularly preferred for mechanical strength.
  • the invention provides an actuator with one by mechanical and magnetic decoupling target free of interference, by the signal quality and the accuracy of the position determination clearly can be increased.
  • FIG. 1 shows an internal combustion engine 10 in the region of the cylinder head shown, in which the lift valve 12 by a camshaft-less valve train in Form of an electromagnetic actuator 14 is actuated.
  • the actuator 14 comprises two electromagnets 16, 18 through which an armature or, more generally said a plunger 20 extends at its lower end with the Lift valve stem 22 is connected so that the axial, oscillating movement of the Tappet 20 immediately corresponding movement of the lift valve 12th causes.
  • the axial movement of the plunger 20 is to be path-controlled, which is why the position of the plunger must be determined as precisely and quickly as possible.
  • a sensor 24 surrounding the plunger is for determining the position of the plunger 20 provided. Radially inward of the sensor 24 is a target ring 26 in one Circumferential groove 27 fastened in the plunger 20 without play and gap. The sensor 24 determines the position of the target ring 26 and thus the plunger 20 and Lift valve 22.
  • the target ring 26 is preferably made of an iron alloy, steel or a ferritic material formed. Alternatively, conventional ones can also be used Copper targets are used. In the embodiment shown, the Target ring is a separate, prefabricated part that can be glued or attached to the ram Soldering is attached.
  • the plunger or anchor shaft 20 preferably consists of a austenitic alloy. But it can also be martensitic or non-magnetic Materials are used.
  • the geometry of the target ring 26 and that of the target ring Circumferential groove 27 can be freely selected, as is the case, for example, in DE 201 15 060 U1 is described.
  • the target ring 26 preferably consists of two or more Ring segments that simply from the radially outside on the plunger, more precisely in the circumferential groove forming sections of the outer circumference are used.
  • the Segments, more precisely cylinder half shells, are in the circumferential groove and if necessary also attached to each other by soldering or gluing.
  • the Dimensions of the segments are matched to that of the circumferential groove, so that as radially and circumferentially as possible no gap or between the segments Shock occurs.
  • plunger or anchor shaft 20 and target ring 26 is in the figure 2 shown in detail. It can be seen in particular that the plunger 20 and the in the circumferential groove 27 in the ram inserted target ring 26 by means of a soldering or bonding layer 40 produced by adhesive bonding.
  • the connecting layer 40 is for the mechanical decoupling of the plunger 20 and of the target ring 26 is designed to be force-isolating. This means that the Connection layer 40 in particular that caused by vibrations of the plunger caused compressive and tensile stresses, which are no longer be transferred to the target ring 26.
  • connection layer 40 is one porous solder joint with a porosity of at least 10%, measured as Pore volume in relation to the volume of the sample.
  • the solder joint can by soldering the plunger 20 and the target ring 26 with conventional, mostly silver-containing high-temperature solders are produced that additionally Contain sacrificial materials or propellants to create porosity. about the proportion of the sacrificial materials or the blowing agents can be the porosity of the connection layer can be set in a targeted manner, with the porosity should be at least 10%. Below this limit is the force isolating one Effect of the connection layer is no longer guaranteed.
  • connection layer 40 is at least 30%, which makes the Elasticity of the connection layer and its vibration-damping effect can also be increased.
  • connection layer made of an elastomer, i.e. a plastic Rubber elasticity. It is also conceivable for gluing the Tappet 20 and the target 26 to use a foam, for example based on polyurethane, which creates a porous, closed-cell or can form open-cell connection layer 40.
  • Test trials with the assembly according to the invention in one camshaftless valve train resulted in a significant reduction in Interference signals at the sensor and thus an improved accuracy of Determining the position of the ram. Ultimately, this will result in improved control of the valve train, which also increases the life of the component.

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)
EP03011134A 2002-06-17 2003-05-23 Actionneur de soupapes sans arbre à cames avec détecteur de position de la tige de soupape Withdrawn EP1375845A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20209369U DE20209369U1 (de) 2002-06-17 2002-06-17 Baugruppe für einen Aktuator und die Baugruppe enthaltender nockenwellenloser Aktuator
DE20209369U 2002-06-17

Publications (1)

Publication Number Publication Date
EP1375845A1 true EP1375845A1 (fr) 2004-01-02

Family

ID=7972250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03011134A Withdrawn EP1375845A1 (fr) 2002-06-17 2003-05-23 Actionneur de soupapes sans arbre à cames avec détecteur de position de la tige de soupape

Country Status (2)

Country Link
EP (1) EP1375845A1 (fr)
DE (1) DE20209369U1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004029504B4 (de) * 2004-06-18 2008-05-08 Trw Automotive Gmbh Verfahren zur Herstellung eines Aktuators und nach dem Verfahren erhältlicher Aktuator
DE102006045827A1 (de) * 2006-09-22 2008-04-10 Dichtungstechnik G. Bruss Gmbh & Co. Kg Axialverschiebbares Bauteil insbesondere in einem Kraftfahrzeugmotor oder -getriebe
US8985077B2 (en) 2013-03-08 2015-03-24 Ford Global Technologies, Llc Valvetrain impact absorber

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0446969A2 (fr) * 1984-02-10 1991-09-18 Kabushiki Kaisha Sg Dispositif de détection de la position linéaire
US5652510A (en) * 1994-06-03 1997-07-29 Sony Corporation Linear magnetic shaft position sensor monitoring changes in the inductance in a coil
EP0915319A1 (fr) * 1997-11-06 1999-05-12 Isuzu Ceramics Research Institute Co., Ltd. Corps en mouvement et moyen pour détecter sa position
DE20115060U1 (de) * 2001-09-12 2002-01-31 TRW Deutschland GmbH, 30890 Barsinghausen Nockenwellenloser Aktuator für Betätigung eines Hubventils

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0446969A2 (fr) * 1984-02-10 1991-09-18 Kabushiki Kaisha Sg Dispositif de détection de la position linéaire
US5652510A (en) * 1994-06-03 1997-07-29 Sony Corporation Linear magnetic shaft position sensor monitoring changes in the inductance in a coil
EP0915319A1 (fr) * 1997-11-06 1999-05-12 Isuzu Ceramics Research Institute Co., Ltd. Corps en mouvement et moyen pour détecter sa position
DE20115060U1 (de) * 2001-09-12 2002-01-31 TRW Deutschland GmbH, 30890 Barsinghausen Nockenwellenloser Aktuator für Betätigung eines Hubventils

Also Published As

Publication number Publication date
DE20209369U1 (de) 2002-10-31

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