EP0406527A1 - Dispositif d'entraînement de deux pompes à huile pour moteur à combustion interne à pistons alternatifs - Google Patents

Dispositif d'entraînement de deux pompes à huile pour moteur à combustion interne à pistons alternatifs Download PDF

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Publication number
EP0406527A1
EP0406527A1 EP90106688A EP90106688A EP0406527A1 EP 0406527 A1 EP0406527 A1 EP 0406527A1 EP 90106688 A EP90106688 A EP 90106688A EP 90106688 A EP90106688 A EP 90106688A EP 0406527 A1 EP0406527 A1 EP 0406527A1
Authority
EP
European Patent Office
Prior art keywords
crankshaft
oil pump
gear
driven
internal combustion
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
EP90106688A
Other languages
German (de)
English (en)
Other versions
EP0406527B1 (fr
Inventor
Herbert Dipl.-Ing. Ampferer (Fh)
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
Original Assignee
Dr Ing HCF Porsche 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 Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP0406527A1 publication Critical patent/EP0406527A1/fr
Application granted granted Critical
Publication of EP0406527B1 publication Critical patent/EP0406527B1/fr
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
    • 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
    • F01L1/02—Valve drive
    • 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
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1832—Number of cylinders eight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/08—Endless member is a chain
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the invention relates to a device for driving two oil pumps arranged on a reciprocating piston internal combustion engine according to the preamble of claim 1.
  • a lubricating oil supply for an internal combustion engine which has a main oil pump for supplying a main lubricating oil circuit and a second oil pump for a secondary lubricating oil circuit of auxiliary machines.
  • EP-PS 163 046 describes a hydraulic device for adjusting the angle of two camshafts, in which an oil pump supplies the hydraulic pressure for the cam rotation device and at the same time supplies the bearings of the camshaft with lubricating oil.
  • the characteristic feature of claim 1 serves to solve this problem. Since two separate drives are used to drive the two oil pumps from the crankshaft and to separate the functions, one oil pump for supplying lubricating oil, the other oil pump is used exclusively for building up the hydraulic pressure on the camshaft twisting device both oil pumps are optimally designed with regard to delivery volume and delivery pressure. While the main oil pump for supplying lubricating oil supplies relatively large amounts of oil with low pressure, the second oil pump is designed in such a way that it delivers a small amount of delivery with significantly higher pressure.
  • a space-saving design is achieved in that the drives of both pumps are located at the point of the crankshaft from which the camshaft drive also takes place, so that no additional space is required in the axial direction of the internal combustion engine for the drives of the oil pumps. If the main oil pump is below the crankshaft, the second oil pump and its drive this space is fully used together with the camshaft drive above the crankshaft.
  • a further space advantage can be achieved by the second oil pump being integrated in an idler gear of the camshaft drive and being driven by it lying coaxially to the idler gear.
  • a flywheel 3 On a crankshaft 2 of an 8-cylinder V-engine mounted in a crankcase 1, a flywheel 3 is screwed to the output-side end face with several screws 4.
  • a camshaft drive emanating from the crankshaft 2 is arranged between the flywheel 3 and the final bearing 5. It consists of a meshing with a crankshaft gear 6 gear 7 of an idler gear 8 and two chain drives driven by the idler gear 8 to the four camshafts 11, 12, 13, 14 assigned to the two cylinder rows 9, 10, each of which has a double sprocket 11 ', 12 ', 13', 14 'wear.
  • the double sprockets 11 ', 12' are driven with a double roller chain 15 by a double sprocket 16, the double sprockets 13 ', 14' with a double roller chain 17 by a double sprocket 18.
  • the double sprockets 16, 18 are formed in one piece and attached to the hub sleeve 19 of the gear 7.
  • an oil pump 20 which supplies hydraulic turning devices 21, 22 on the camshafts 11, 13 with hydraulic pressure. With the twisting devices, the rotational position between the camshafts 11, 13 and their associated sprockets 11 ', 13' is changed.
  • a pump wheel 24 is fastened on a hollow hub 23 of the gear wheel 7.
  • the oil pump 20 is covered by a pump cover 25 which, together with a cover disk 26 screwed to it, forms the pump housing.
  • a bearing sleeve 27 is fastened in the pump cover 15, on which the intermediate wheel 8 is mounted and through which the oil supply to the oil pump 20 takes place.
  • crankshaft 2 to idler gear 8 has a ratio of 1: 2, but the sprocket ratio from idler gear 8 to camshafts 11, 12, 13, 14 is 1: 1, camshafts 11, 12, 13, 14 also run half crankshaft speed around.
  • the main oil pump 30 is driven by the crankshaft 2 with a chain drive 31. It sucks in lubricating oil from the oil pan 32 and pumps it with a pressure of approx. 3 bar to the bearing points of the internal combustion engine to be lubricated. A partial flow of this oil passes through the central bore of the bearing sleeve 27 to the oil pump 20, which increases the oil pressure to approximately 8 bar and gives it to the hydraulic camshaft twisting devices 21. Since this hydraulic pressure is very high, the camshaft rotating devices 21 can be made small-volume in the desired manner.
  • the chain drive 31 is formed by a chain wheel 33 fastened to the crankshaft 2, a chain 34 and a chain wheel 35 fastened to the main oil pump 30.
  • the chain wheel 33 is composed of two half-shells which were formed by radial blasting of a cylindrical chain wheel hub. In a groove 36 of the crankshaft 2, the two half-shells of the chain wheel 33 are joined together again at their break point and held axially.
  • a tension ring 37 mounted on the chain wheel 35 holds the two half shells together radially.
  • the sprocket 33 is locked in the circumferential direction with a fitting sleeve 38 which is fixed in the crankshaft 2 and which was pushed through during assembly through an aligned bore 39 of the flywheel.
  • the ring gear 40 of the chain wheel 33 and thus the entire chain drive 31 is located centrally between the two double chain wheels 16, 18 of the camshaft drive.
  • crankshaft gear 6 is pushed for assembly over the smoothly turned outer surface 41 of the crankshaft 2 until it rests on the clamping ring 37. At this seat it is shrunk onto the crankshaft 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Reciprocating Pumps (AREA)
EP90106688A 1989-07-01 1990-04-06 Dispositif d'entraînement de deux pompes à huile pour moteur à combustion interne à pistons alternatifs Expired - Lifetime EP0406527B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3921715 1989-07-01
DE3921715A DE3921715A1 (de) 1989-07-01 1989-07-01 Vorrichtung zum antrieb zweier oelpumpen an einer hubkolben-brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0406527A1 true EP0406527A1 (fr) 1991-01-09
EP0406527B1 EP0406527B1 (fr) 1993-09-08

Family

ID=6384126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106688A Expired - Lifetime EP0406527B1 (fr) 1989-07-01 1990-04-06 Dispositif d'entraînement de deux pompes à huile pour moteur à combustion interne à pistons alternatifs

Country Status (5)

Country Link
US (1) US5063895A (fr)
EP (1) EP0406527B1 (fr)
JP (1) JP2888934B2 (fr)
DE (2) DE3921715A1 (fr)
ES (1) ES2044291T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992013177A1 (fr) * 1991-01-26 1992-08-06 Dr.Ing.H.C. F. Porsche Aktiengesellschaft Entrainement d'arbre a cames pour un moteur a combustion interne en v
WO1992014641A1 (fr) * 1991-02-20 1992-09-03 Alfred Teves Gmbh Systeme hydraulique
EP0503635A1 (fr) * 1991-03-15 1992-09-16 Honda Giken Kogyo Kabushiki Kaisha Système d'alimentation en huile pour un moteur à combustion interne
US5190005A (en) * 1990-10-31 1993-03-02 Suzuki Motor Corporation Attaching structure for oil pump of engine
DE19622688A1 (de) * 1996-06-05 1997-12-11 Bayerische Motoren Werke Ag Brennkraftmaschine mit mittels schmierölversorgten gesonderten Hydraulikkreisen
FR3073594A1 (fr) * 2017-11-16 2019-05-17 Renault S.A.S. Ensemble pour moteur a combustion interne, notamment de vehicule automobile, comprenant au moins un arbre a cames, un vilebrequin et un organe de transmission

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3929621A1 (de) * 1989-09-06 1991-03-07 Bayerische Motoren Werke Ag Vorrichtung zur relativen drehwinkelverstellung einer welle zu einem antriebsrad, insbesondere nockenwelle einer brennkraftmaschine
US5184578A (en) * 1992-03-05 1993-02-09 Borg-Warner Automotive Transmission & Engine Components Corporation VCT system having robust closed loop control employing dual loop approach having hydraulic pilot stage with a PWM solenoid
GB2303669B (en) * 1995-07-20 1998-03-04 Suzuki Motor Co Oil pump sprocket cover for an internal combustion engine
DE19622676C2 (de) * 1996-06-05 1998-11-19 Daimler Benz Ag Kettentrieb, insbesondere Nebenantrieb bei einer Brennkraftmaschine
DE19647299C1 (de) * 1996-11-15 1998-04-09 Daimler Benz Ag Steuergehäuse für eine Brennkraftmaschine
US5894830A (en) * 1997-12-15 1999-04-20 Caterpillar Inc. Engine having a high pressure hydraulic system and low pressure lubricating system
DE19840659A1 (de) 1998-09-05 2000-03-09 Volkswagen Ag Steuertrieb für Nockenwellenanordnungen
US6289878B1 (en) 1999-07-15 2001-09-18 Caterpillar Inc. Engine having multiple pumps driven by a single shaft
DE19959594C1 (de) 1999-12-10 2001-06-21 Bayerische Motoren Werke Ag Kettentrieb eines V-Motors mit obenliegenden Nockenwellen
JP2001342812A (ja) * 2000-05-31 2001-12-14 Sanshin Ind Co Ltd 船外機用４サイクルエンジン
DE10161131B4 (de) * 2000-12-12 2013-11-07 Slw Automotive Inc. Flügelpumpe veränderlicher Verdrängung
US7674095B2 (en) * 2000-12-12 2010-03-09 Borgwarner Inc. Variable displacement vane pump with variable target regulator
DE60333503D1 (de) * 2002-04-03 2010-09-02 Slw Automotive Inc Pumpe mit variabler Förderleistung und Steuerung dafür
US7726948B2 (en) * 2002-04-03 2010-06-01 Slw Automotive Inc. Hydraulic pump with variable flow and variable pressure and electric control
DE10308760B4 (de) * 2003-02-28 2005-06-30 Dr.Ing.H.C. F. Porsche Ag Steuertrieb für eine in ein Kraftfahrzeug einbaubare Brennkraftmaschine
US7682136B2 (en) * 2003-03-28 2010-03-23 Caterpillar Inc. Multiple pump housing
US7055486B2 (en) * 2003-03-28 2006-06-06 Caterpillar Inc. Fluid delivery control system
US7114482B2 (en) * 2003-03-28 2006-10-03 Caterpillar Inc. Engine lubrication circuit including two pumps
DE10314969A1 (de) * 2003-04-02 2004-10-14 Daimlerchrysler Ag Antriebsvorrichtung an einer Brennkraftmaschine
US6786188B1 (en) * 2003-05-15 2004-09-07 Kawasaki Jukogyo Kabushiki Kaisha Dry-sump lubrication type four-stroke cycle engine
US7007654B2 (en) * 2003-08-04 2006-03-07 Bulent Aliev Pre-and post-ignition auxiliary oil circulation system for an internal combustion engine
US7156060B2 (en) * 2004-12-28 2007-01-02 Honda Motor Co., Ltd. Cam drive gear and valve operating system drive gear for engine
FR2882786B1 (fr) * 2005-03-01 2007-04-20 Renault Sas Moteur a combustion interne comportant un agencement de pignons sur une extremite du vilebrequin
JP2007309234A (ja) * 2006-05-19 2007-11-29 Honda Motor Co Ltd 内燃機関の潤滑装置
DE102006027660A1 (de) * 2006-06-14 2007-12-20 Schwäbische Hüttenwerke Automotive GmbH & Co. KG Ölpumpenvorrichtung für eine Brennkraftmaschine mit einer Ölwanne
DE102008036787A1 (de) * 2008-08-07 2010-02-11 Volkswagen Ag Hubkolben-Brennkraftmaschine
CN102121520A (zh) * 2010-12-27 2011-07-13 中国北车集团大连机车车辆有限公司 齿轮传动装置
DE102015005344A1 (de) * 2015-04-28 2016-11-03 Volkswagen Aktiengesellschaft Nebenaggregatsantriebsvorrichtung
US10422253B2 (en) * 2016-04-26 2019-09-24 Ford Global Technologies, Llc Cam drive system for an engine
GB2551602B (en) * 2016-06-20 2020-10-28 Ford Global Tech Llc An engine assembly with improved oil pressure regulation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3159047A (en) * 1962-09-21 1964-12-01 George F Dable Segmented gear
DE2620480A1 (de) * 1976-05-08 1977-11-24 Motoren Turbinen Union Schmieroelversorgung
EP0163046A1 (fr) * 1984-04-28 1985-12-04 Pierburg Gmbh Dispositif pour varier la phase entre un arbre, spécialement un arbre à cames, et un arbre de commande
DE3619577A1 (de) * 1986-06-11 1987-12-17 Kloeckner Humboldt Deutz Ag Riemen- oder kettentrieb einer brennkraftmaschine mit oelpumpenantrieb als spannrad
EP0272677A1 (fr) * 1986-12-23 1988-06-29 FIAT AUTO S.p.A. Moteur à combustion interne

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589382A (en) * 1982-01-08 1986-05-20 Honda Giken Kogyo Kabushiki Kaisha V-type multicylinder internal combustion engine
US4878461A (en) * 1987-02-24 1989-11-07 Siemens-Bendix Automotive Electronics L.P. Variable camshaft timing system
DE3729603A1 (de) * 1987-09-04 1989-03-16 Porsche Ag Schmiervorrichtung fuer einen hubkolbenmotor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3159047A (en) * 1962-09-21 1964-12-01 George F Dable Segmented gear
DE2620480A1 (de) * 1976-05-08 1977-11-24 Motoren Turbinen Union Schmieroelversorgung
EP0163046A1 (fr) * 1984-04-28 1985-12-04 Pierburg Gmbh Dispositif pour varier la phase entre un arbre, spécialement un arbre à cames, et un arbre de commande
DE3619577A1 (de) * 1986-06-11 1987-12-17 Kloeckner Humboldt Deutz Ag Riemen- oder kettentrieb einer brennkraftmaschine mit oelpumpenantrieb als spannrad
EP0272677A1 (fr) * 1986-12-23 1988-06-29 FIAT AUTO S.p.A. Moteur à combustion interne

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5190005A (en) * 1990-10-31 1993-03-02 Suzuki Motor Corporation Attaching structure for oil pump of engine
GB2249346B (en) * 1990-10-31 1995-05-24 Suzuki Motor Co Attaching structure of oil pump of engine
WO1992013177A1 (fr) * 1991-01-26 1992-08-06 Dr.Ing.H.C. F. Porsche Aktiengesellschaft Entrainement d'arbre a cames pour un moteur a combustion interne en v
US5386808A (en) * 1991-01-26 1995-02-07 Dr. Ing, H.C.F. Porsche Ag Camshaft drive for an internal-combustion V-engine
WO1992014641A1 (fr) * 1991-02-20 1992-09-03 Alfred Teves Gmbh Systeme hydraulique
US5509383A (en) * 1991-02-20 1996-04-23 Itt Automotive Europe Gmbh Hydraulic unit
EP0503635A1 (fr) * 1991-03-15 1992-09-16 Honda Giken Kogyo Kabushiki Kaisha Système d'alimentation en huile pour un moteur à combustion interne
US5195474A (en) * 1991-03-15 1993-03-23 Honda Giken Kogyo Kabushiki Kaisha Oil supply system in internal conbustion engine
DE19622688A1 (de) * 1996-06-05 1997-12-11 Bayerische Motoren Werke Ag Brennkraftmaschine mit mittels schmierölversorgten gesonderten Hydraulikkreisen
FR3073594A1 (fr) * 2017-11-16 2019-05-17 Renault S.A.S. Ensemble pour moteur a combustion interne, notamment de vehicule automobile, comprenant au moins un arbre a cames, un vilebrequin et un organe de transmission
EP3486524A1 (fr) * 2017-11-16 2019-05-22 RENAULT s.a.s. Ensemble pour moteur a combustion interne, notamment de vehicule automobile, comprenant au moins un arbre a cames, un vilebrequin et un organe de transmission

Also Published As

Publication number Publication date
JP2888934B2 (ja) 1999-05-10
JPH0343613A (ja) 1991-02-25
ES2044291T3 (es) 1994-01-01
DE59002620D1 (de) 1993-10-14
US5063895A (en) 1991-11-12
EP0406527B1 (fr) 1993-09-08
DE3921715A1 (de) 1991-01-10

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