EP1025343B1 - Dispositif de modification relative de la position en rotation d'un arbre par rapport au pignon d'entree - Google Patents

Dispositif de modification relative de la position en rotation d'un arbre par rapport au pignon d'entree Download PDF

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Publication number
EP1025343B1
EP1025343B1 EP99917979A EP99917979A EP1025343B1 EP 1025343 B1 EP1025343 B1 EP 1025343B1 EP 99917979 A EP99917979 A EP 99917979A EP 99917979 A EP99917979 A EP 99917979A EP 1025343 B1 EP1025343 B1 EP 1025343B1
Authority
EP
European Patent Office
Prior art keywords
pressure
rotational position
changing
control
valve
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.)
Revoked
Application number
EP99917979A
Other languages
German (de)
English (en)
Other versions
EP1025343A1 (fr
Inventor
Bernd Niethammer
Andreas Knecht
Alfred Trzmiel
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.)
Dr Ing HCF Porsche AG
Hilite Germany GmbH
Original Assignee
Dr Ing HCF Porsche AG
Hydraulik Ring 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7869029&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1025343(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Dr Ing HCF Porsche AG, Hydraulik Ring GmbH filed Critical Dr Ing HCF Porsche AG
Priority to EP03009907.1A priority Critical patent/EP1331367B1/fr
Publication of EP1025343A1 publication Critical patent/EP1025343A1/fr
Application granted granted Critical
Publication of EP1025343B1 publication Critical patent/EP1025343B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2102—Adjustable

Definitions

  • the invention relates to a device for the relative change in the rotational position of a shaft Drive wheel, in particular a camshaft of an internal combustion engine, according to the Genus of the main claim.
  • Such a device is known for example from WO 95/31633.
  • This cell wheel is over a Chain or belt drive driven by the crankshaft of an internal combustion engine.
  • the pressurization of the respective pressure rooms takes place via an as 4/3-way valve designed control valve, via which the pressure chambers in dependence of the desired change in rotational position with a pressure medium pump or Pressure medium tank are connected. This leads to one of these control valves Pressure line to all pressure chambers acting in the same direction.
  • a hydraulically unlockable check valve is arranged, the locking effect can be canceled by the pressure in the other pressure line.
  • These check valves can be used in the neutral position of the control valve Neglecting the leakage losses a hydraulic clamping of the two relative rotatable components can be achieved.
  • such a facility is relatively complex. In addition, it may be due to the adjustment process the almost unthrottled connection of one pressure chamber group to the Pressure medium tank for unwanted position deviations and inaccurate or fluctuating adjustment processes come.
  • US-A 4,858,572 is also a device for changing the rotational position known in which an inner part is rotatably connected to the end of the camshaft and has on its outside a plurality of radial slots distributed over the circumference, in which wing elements are guided radially.
  • This inner part is made by surround a cellular wheel, which has several hydraulically loadable cells, through the wings in two pressure chambers acting against each other be divided. By pressurizing these pressure rooms in Depending on the pressure difference, the cellular wheel relative to the inner part and thus to Camshaft can be turned.
  • These pistons are made by Compression spring elements in the direction of the inner part and are in the opposite direction can be moved by hydraulic loading of the holes in the inner ring.
  • This spring-loaded piston should the device in one of its two end positions be locked as long as the pressure is applied to the pressure chambers defined level not reached. Only when a certain pressure level is reached the pistons are pushed back against the action of the compression springs and allow the inner part to be rotated relative to the cellular wheel.
  • the device is said to make rattling noises when starting up Internal combustion engine can be avoided by changing moment loads can occur during startup and operation of the internal combustion engine.
  • the invention is based on the object, the generic Device for changing the relative rotational position of a shaft to the drive wheel in this regard to improve that this is simple and inexpensive and a fluctuation-free change of the rotation position enables. It should focus on the The use of several complex and expensive control valves can be dispensed with.
  • the device when the engine is at a standstill and in stationary operation the device allows a single-acting hydraulic lock.
  • a damping or throttling acting on the entire adjustment process Drain side is reached when the control cross-section to the pressure medium tank during the adjustment process is always smaller than the opening cross-section to the pressure medium pump is.
  • a particularly advantageous and inexpensive training of the device for relative change in rotational position results when both the inlet control and the Sequence control for the assigned direction of rotation via a common valve element of the control valve is controlled.
  • Such a device for the relative change in rotational position is again Simplified or less expensive if the rotation position change for both directions a common control valve or a common valve member can be used.
  • the control valve can in a particularly advantageous manner as a 4/3-way valve be formed, which for the inflow and outflow control for both Valve member acting in the direction of rotation is designed as a valve slide.
  • 1 denotes the camshaft of an internal combustion engine the end of a device known for example from DE 39 37 644 A1 hydraulic rotation angle adjustment of the camshaft relative to its drive wheel or is arranged to the crankshaft.
  • This adjustment device 2 has a rotationally fixed with the Camshaft connected inner part 3, which is provided with radial webs 4. This divide the cells of a cellular wheel 5, delimited by radial webs 6, into each two opposing pressure rooms.
  • the cellular wheel 5 is also the drive wheel and for example with a chain drive or belt drive with the crankshaft Internal combustion engine connected. By pressurizing the Pressure chambers can be connected to the camshaft 1 inner part 3 relative to Cell wheel 5 are rotated so that the phase position of the gas exchange valves change the actuating cam.
  • the hydraulic control of the pressure chambers takes place via two in the camshaft Separately formed pressure channels 7 and 8, the two in one Camshaft bearings 9 formed ring grooves 9 and 10 each with a control line 11 and 12 are connected.
  • the two control lines 11 and 12 are with one Control valve 13 connected, in this embodiment as a 4/3-way valve is trained.
  • the connection of the control valve 13 to the control line 11 is A designated, the connection to the control line 12 with B.
  • the control valve 13 has a pressure port P and a return port T on.
  • the pressure port P is via a pressure line 14 and a check valve 15 with the pressure medium source serving lubricant pump 16 of the internal combustion engine connected. This is in turn via a suction line with the oil storage tank 17 or the oil pan Internal combustion engine connected.
  • the return port T of the control valve 13 is also connected to this oil storage tank 17.
  • the control valve 13 designed as a 4/3-way proportional valve has a valve housing 18 with a valve bore 19, the five mutually spaced ring grooves is surrounded. These five ring grooves are in the arrangement shown in FIG continuously designated 20 to 24 from left to right.
  • the ring grooves 20 and 24 are connected to the return port T in a manner known per se.
  • the ring groove 21 is connected to the pressure port B, while the annular groove 23 with the Pressure port A is connected.
  • the central annular groove 22 is connected to the pressure connection P connected.
  • In the valve bore 19 is a sealing and longitudinally displaceable as Control piston formed valve member 25 out.
  • the length of the Piston sections 26 and 27 is selected so that the overlap of the annular grooves 21st and 23 is significantly larger on the end face facing away from the pressure connection P. Becomes the valve member 25 from the neutral position II shown in FIG. 2, for example shifted to the right in switching position I, the pressure port P facing Area of the annular groove 23 no longer covered by the piston section 27 or Approved. On the opposite side is due to the greater coverage the annular groove 21 is still completely covered by the piston section 26. At the start the adjustment process can thus be assigned to the pressure port B pressure chamber are applied without the opposite, the pressure connection A assigned pressure chamber is relieved.

Claims (5)

  1. Dispositif pour modifier la position de rotation relative d'un arbre (1) par rapport à la roue d'entraínement (5), en particulier d'un arbre à cames d'un moteur à combustion interne, comportant un dispositif de réglage (3) avec deux chambres sous pression agissant l'une à l'encontre de l'autre, comportant une pompe à fluide sous pression (16), un réservoir de fluide sous pression (17) et au moins une soupape de commande (13), dans lequel, pendant l'opération de réglage, une chambre sous pression est reliée à la pompe à fluide sous pression (16) et l'autre chambre sous pression au réservoir de fluide sous pression (17), caractérisé en ce qu'au début d'une opération de réglage, ladite une chambre sous pression est reliée à la pompe à fluide sous pression (16) avant que l'autre ne soit reliée au réservoir de fluide sous pression (17).
  2. Dispositif pour modifier la position de rotation relative d'un arbre (1) par rapport à la roue d'entraínement (5), selon la revendication 1, caractérisé en ce que la section transversale de commande de la liaison (23, 24 ; 21, 20) entre ladite une chambre sous pression et le réservoir de fluide sous pression, est toujours inférieure, pendant l'opération de réglage, à la section d'ouverture de la liaison (21, 22 ; 22, 23) entre l'autre chambre sous pression et la pompe à fluide sous pression (17).
  3. Dispositif pour modifier la position de rotation relative d'un arbre (1) par rapport à la roue d'entraínement (5), selon la revendication 1 ou 2, caractérisé en ce que la section de commande de la liaison (23, 24 ; 21, 20) entre ladite une chambre sous pression et le réservoir de fluide sous pression, et la section de commande (21, 22 ; 22, 23) de la liaison entre l'autre chambre sous pression et la pompe à fluide sous pression, sont commandées au moyen d'un organe de soupape (25) commun de la soupape de commande (13).
  4. Dispositif pour modifier la position de rotation relative d'un arbre (1) par rapport à la roue d'entraínement (5), selon la revendication 3, caractérisé en ce qu'on utilise un organe de soupape (25) commun d'une soupape de commande (13) pour les deux sens de variation de la position de rotation.
  5. Dispositif pour modifier la position de rotation relative d'un arbre (1) par rapport à la roue d'entraínement (5), selon l'une des revendications précédentes, caractérisé en ce que la soupape de commande est réalisée sous la forme d'une soupape proportionnelle à 4/3 voies (13).
EP99917979A 1998-05-27 1999-04-14 Dispositif de modification relative de la position en rotation d'un arbre par rapport au pignon d'entree Revoked EP1025343B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03009907.1A EP1331367B1 (fr) 1998-05-27 1999-04-14 Dispositif d'actionnement pour modifier la position angulaire relative d'un arbre et d'une poulie d'entrainement, en particulier pour un arbre à cames de moteur à combustion interne

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19823619A DE19823619A1 (de) 1998-05-27 1998-05-27 Einrichtung zur relativen Drehlagenänderung einer Welle zum Antriebsrad
DE19823619 1998-05-27
PCT/EP1999/002505 WO1999061759A1 (fr) 1998-05-27 1999-04-14 Dispositif de modification relative de la position en rotation d'un arbre par rapport au pignon d'entree

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP03009907.1A Division EP1331367B1 (fr) 1998-05-27 1999-04-14 Dispositif d'actionnement pour modifier la position angulaire relative d'un arbre et d'une poulie d'entrainement, en particulier pour un arbre à cames de moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP1025343A1 EP1025343A1 (fr) 2000-08-09
EP1025343B1 true EP1025343B1 (fr) 2003-07-16

Family

ID=7869029

Family Applications (2)

Application Number Title Priority Date Filing Date
EP03009907.1A Expired - Lifetime EP1331367B1 (fr) 1998-05-27 1999-04-14 Dispositif d'actionnement pour modifier la position angulaire relative d'un arbre et d'une poulie d'entrainement, en particulier pour un arbre à cames de moteur à combustion interne
EP99917979A Revoked EP1025343B1 (fr) 1998-05-27 1999-04-14 Dispositif de modification relative de la position en rotation d'un arbre par rapport au pignon d'entree

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP03009907.1A Expired - Lifetime EP1331367B1 (fr) 1998-05-27 1999-04-14 Dispositif d'actionnement pour modifier la position angulaire relative d'un arbre et d'une poulie d'entrainement, en particulier pour un arbre à cames de moteur à combustion interne

Country Status (8)

Country Link
US (1) US6209497B1 (fr)
EP (2) EP1331367B1 (fr)
JP (1) JP2002516947A (fr)
KR (1) KR100530825B1 (fr)
CN (1) CN1100197C (fr)
DE (2) DE19823619A1 (fr)
ES (1) ES2204124T3 (fr)
WO (1) WO1999061759A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853670B4 (de) * 1998-11-20 2007-07-26 Hydraulik-Ring Gmbh Einrichtung zur Nockenwellenverstellung
DE102007035672A1 (de) 2007-07-27 2009-01-29 Hydraulik-Ring Gmbh Nockenwellenversteller
DE102007035671A1 (de) 2007-07-27 2009-01-29 Hydraulik-Ring Gmbh Schwenkmotorphasenversteller
DE102007041552A1 (de) 2007-08-31 2009-03-05 Schaeffler Kg Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine
DE102007042046A1 (de) 2007-09-05 2009-03-12 Hydraulik-Ring Gmbh Antriebsmotor mit einem Nockenwellenversteller mit einem elektromagnetischen Hydraulikventil
DE102007056683A1 (de) 2007-11-24 2009-05-28 Schaeffler Kg Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine
DE102007056685A1 (de) 2007-11-24 2009-05-28 Schaeffler Kg Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine
DE102007057882A1 (de) 2007-11-29 2009-06-10 Hydraulik-Ring Gmbh Elektrohydraulisches Ventil
DE102011051656A1 (de) 2011-07-07 2013-01-10 Hydraulik-Ring Gmbh Schwenkmotorversteller

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JP4802394B2 (ja) * 2000-08-03 2011-10-26 アイシン精機株式会社 弁開閉時期制御装置
EP1596040B1 (fr) * 2004-05-14 2010-10-13 Schaeffler KG Déphaseur d'arbre à cames
JP4640616B2 (ja) * 2006-08-23 2011-03-02 アイシン精機株式会社 弁開閉時期制御装置
DE102008006179A1 (de) * 2008-01-26 2009-07-30 Schaeffler Kg Steuerventil für eine Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen in Brennkraftmaschinen
DE102009022869A1 (de) * 2009-05-27 2010-12-09 Hydraulik-Ring Gmbh Flügelzellennockenwellenverstellersystem
DE102009050779B4 (de) 2009-10-27 2016-05-04 Hilite Germany Gmbh Schwenkmotornockenwellenversteller mit einer Reibscheibe und Montageverfahren
DE102009052841A1 (de) * 2009-11-13 2011-05-19 Hydraulik-Ring Gmbh Nockenwelleneinsatz
DE202010006605U1 (de) 2010-04-03 2010-11-18 Hydraulik-Ring Gmbh Zentralventil
DE102010013777A1 (de) 2010-04-03 2011-10-06 Hydraulik-Ring Gmbh Zentralventil
DE102010045358A1 (de) 2010-04-10 2011-10-13 Hydraulik-Ring Gmbh Schwenkmotornockenwellenversteller mit einem Hydraulikventil
DE102010019004B4 (de) 2010-05-03 2014-09-18 Hilite Germany Gmbh Schwenkmotorversteller mit einem Hydraulikventil
DE102010019005B4 (de) 2010-05-03 2017-03-23 Hilite Germany Gmbh Schwenkmotorversteller
DE102010023864B4 (de) 2010-06-15 2018-03-08 Hilite Germany Gmbh Zentralventil für einen Schwenkmotornockenwellenversteller
DE102010044637A1 (de) 2010-09-07 2012-03-08 Hydraulik-Ring Gmbh Zentralventil
DE102010061337B4 (de) 2010-12-20 2015-07-09 Hilite Germany Gmbh Hydraulikventil für einen Schwenkmotorversteller
DE102011001301B4 (de) 2011-03-16 2017-09-21 Hilite Germany Gmbh Schwenkmotorversteller
DE102012106096B3 (de) 2012-07-06 2014-05-15 Hilite Germany Gmbh Schwenkmotorversteller mit einem Hydraulikventil
EP2796673B1 (fr) 2013-04-22 2018-03-07 Hilite Germany GmbH Soupape centrale pour un moteur pivotant à l'ajustage
DE102013104031B4 (de) 2013-04-22 2017-10-05 Hilite Germany Gmbh Zentralventil für einen Schwenkmotorversteller
DE102013104051B4 (de) 2013-04-22 2016-09-22 Hilite Germany Gmbh Zentralventil für einen Schwenkmotorversteller
DE102019113713A1 (de) * 2019-05-23 2020-11-26 ECO Holding 1 GmbH Hydraulikventil für einen Schwenkmotorversteller einer Nockenwelle

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853670B4 (de) * 1998-11-20 2007-07-26 Hydraulik-Ring Gmbh Einrichtung zur Nockenwellenverstellung
DE19853670C5 (de) 1998-11-20 2019-01-10 Hilite Germany Gmbh Einrichtung zur Nockenwellenverstellung
DE102007035671B4 (de) * 2007-07-27 2009-08-06 Hydraulik-Ring Gmbh Schwenkmotorphasenversteller
DE102007035672A1 (de) 2007-07-27 2009-01-29 Hydraulik-Ring Gmbh Nockenwellenversteller
DE102007035671A1 (de) 2007-07-27 2009-01-29 Hydraulik-Ring Gmbh Schwenkmotorphasenversteller
DE102007051407A1 (de) 2007-07-27 2009-04-30 Hydraulik-Ring Gmbh Ventil und Herstellungsverfahren für ein Ventil
DE102007035672B4 (de) * 2007-07-27 2009-08-06 Hydraulik-Ring Gmbh Nockenwellenversteller
DE102007041552A1 (de) 2007-08-31 2009-03-05 Schaeffler Kg Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine
DE102007042046A1 (de) 2007-09-05 2009-03-12 Hydraulik-Ring Gmbh Antriebsmotor mit einem Nockenwellenversteller mit einem elektromagnetischen Hydraulikventil
DE102007056685A1 (de) 2007-11-24 2009-05-28 Schaeffler Kg Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine
DE102007056683A1 (de) 2007-11-24 2009-05-28 Schaeffler Kg Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine
DE102007057882A1 (de) 2007-11-29 2009-06-10 Hydraulik-Ring Gmbh Elektrohydraulisches Ventil
DE102007057882B4 (de) * 2007-11-29 2014-03-06 Hilite Germany Gmbh Elektrohydraulisches Ventil
DE102011051656A1 (de) 2011-07-07 2013-01-10 Hydraulik-Ring Gmbh Schwenkmotorversteller

Also Published As

Publication number Publication date
DE59906295D1 (de) 2003-08-21
EP1331367A3 (fr) 2008-11-19
EP1331367A2 (fr) 2003-07-30
CN1266473A (zh) 2000-09-13
CN1100197C (zh) 2003-01-29
EP1025343A1 (fr) 2000-08-09
ES2204124T3 (es) 2004-04-16
KR20010022275A (ko) 2001-03-15
KR100530825B1 (ko) 2005-11-24
US6209497B1 (en) 2001-04-03
JP2002516947A (ja) 2002-06-11
EP1331367B1 (fr) 2016-09-28
DE19823619A1 (de) 1999-12-02
WO1999061759A1 (fr) 1999-12-02

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