WO1998034037A1 - Roulement et palier comportant un insert de compensation thermique - Google Patents
Roulement et palier comportant un insert de compensation thermique Download PDFInfo
- Publication number
- WO1998034037A1 WO1998034037A1 PCT/FR1998/000115 FR9800115W WO9834037A1 WO 1998034037 A1 WO1998034037 A1 WO 1998034037A1 FR 9800115 W FR9800115 W FR 9800115W WO 9834037 A1 WO9834037 A1 WO 9834037A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- insert
- bearing
- contact
- ring
- bearing according
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
- F16C25/06—Ball or roller bearings
- F16C25/08—Ball or roller bearings self-adjusting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
- F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
- F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
- F16C19/525—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to temperature and heat, e.g. insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
- F16C19/541—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing
- F16C19/542—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing with two rolling bearings with angular contact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/62—Selection of substances
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2202/00—Solid materials defined by their properties
- F16C2202/20—Thermal properties
- F16C2202/22—Coefficient of expansion
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S384/00—Bearings
- Y10S384/90—Cooling or heating
- Y10S384/905—Temperature compensation
Definitions
- the invention relates to a bearing and bearing comprising a thermal compensation insert, constituted by a first ring which carries a first raceway, a second ring which carries a second raceway, a row of rolling bodies with oblique contact arranged in contact. of said raceways and in which the insert compensates for a difference in expansion and is in abutment contact on one of said rings.
- EP-A-0448239 describes a rolling bearing whose compensation insert is made of a material with a high coefficient of thermal expansion which makes it possible to compensate for example the difference in expansion or contraction between a rotating shaft and a housing. mounting of said bearing whose expansion coefficients are different.
- Publication CH-A-318272 describes a bearing in which the compensation insert is cast or injected into a groove located at the periphery of the outer ring.
- Such insert assemblies require prior machining of the support ring and an increase in the axial and / or radial size of the bearing.
- the publications FR-A-2135903 and 1537570 describe bearings whose rings are formed from sheet metal which can have a hollow profile in a box and whose lateral edge serves to position the rolling bodies.
- one of the rings of the sheet metal bearing which provides support for the compensation insert has a conical bearing which is extended by a radial extension of the axial stop for the radial and axial immobilization of the said insert.
- FIG. 1 is a radial section of a tapered roller bearing according to the invention
- FIG. 2 is a radial section of an angular contact ball bearing according to the invention
- FIGS. 3 and 4 are radial sections of two alternative embodiments of the bearing shown in FIG. 1,
- FIG. 5 represents an axial section of a bearing illustrating the mounting arrangement for applying a bearing as shown in FIG. 1.
- Figure 1 is a radial section of a tapered roller bearing consisting of an inner ring 1 which carries a first raceway 11, an outer ring 2 which carries a second raceway 21, a row of tapered rollers 3 mounted in a cage 4 and arranged in contact with said raceways 11, 21.
- the compensation insert 5 is in axial abutment contact with the internal face of a radial extension 22 of the ring 2 formed in the present case by a sleeve 6 or substantially frustoconical sheet metal frame.
- the inner surface of the sleeve 6 constitutes the raceway 21 while the outer surface of the sleeve constitutes the conical bearing 6c which is extended by the radial extension 22 of the stop for the axial and radial immobilization of the insert 5.
- FIG. 2 represents a bearing in which a row of balls 10 with oblique contact rolls in contact with the raceways 11, 21 carried by the inner ring 1 and a bush 6.
- FIGS 3 and 4 show alternative embodiments of the bearing shown in Figure 1.
- the compensation insert 5 is here located in a hollow profile box frame constituted by the first inner sleeve 6 and by an outer sleeve 7 axially fitted on the insert 5.
- the insert 5 is here integral with one and the other socket 6, 7.
- the outer sleeve 7 has, in accordance with FIG. 3, a bottom 7a folded radially in the direction of the axis of rotation of the inner ring 2 of the bearing against which the insert 5 is in axial support.
- the bottom 7a is here substantially located in the plane of the lateral face of the bearing.
- the outer sleeve 7 has, in accordance with FIG. 4, a radial extension 7b oriented substantially in the plane of another lateral face of the bearing.
- the sleeve 7 thus has an S-shaped section with branches 7a, 7b which are substantially radial, which respectively provide the stop for the insert 5 and the stop for the bearing in contact with a lateral partition of a casing.
- FIG. 5 represents the sectional view of a paher including the mounting for applying a bearing in accordance with FIG. 1.
- a fixed casing 30 is closed by an adjustment plate 31 produced by casting a light metal alloy such as an aluminum alloy.
- a shaft 32 for example of steel, rotates in the casing 30 and is supported by angular contact bearing bearings 33, 34.
- the bearings 33, 34 respectively have an inner ring 1 hooped on two corresponding bearing surfaces of the shaft 32 and are supported on shoulders e, of the shaft 32.
- the shoulders e are respectively turned towards the axially spaced rolling bearings 33, 34.
- the bearings 33, 34 are respectively mounted in contact with an abutment wall 35 machined in a partition of the casing 30 and in contact with an abutment wall 36 carried by the plate 31 of the casing 30.
- the outer ring 2 of the paher bearing 34 is made, in accordance with the example shown in FIG. 1, of sheet metal and has a radial extension 22 with a stop face facing the thermal compensation insert 5. The latter is thus mounted on a substantially conical surface between the abutment face of the extension 22 and the axial abutment wall 36 carried by the casing 30.
- the thermal compensation insert is preferably made of a thermoplastic polymer material such as a polyoxymethylene, a polyphenylene glycide, a polyetherimide or a polyamide.
- this polymer material can also be an elastomer loaded with metallic particles.
- the load of metal particles in this case provides the elastomer with physical characteristics comparable to those of a thermoplastic polymer.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Support Of The Bearing (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69840493T DE69840493D1 (en) | 1997-01-31 | 1998-01-23 | Tionseinlage |
EP98903106A EP0956456B1 (fr) | 1997-01-31 | 1998-01-23 | Roulement et palier comportant un insert de compensation thermique |
US09/355,325 US6273614B1 (en) | 1997-01-31 | 1998-01-23 | Rolling and bearing comprising a temperature compensating insert |
JP53257898A JP2001511235A (ja) | 1997-01-31 | 1998-01-23 | 熱補償挿入体を有するころがり軸受および熱補償挿入体を有するころがり軸受を適用したシャフト取付け構造 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9701051A FR2759129B1 (fr) | 1997-01-31 | 1997-01-31 | Roulement et palier comportant un insert de compensation thermique |
FR97/01051 | 1997-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998034037A1 true WO1998034037A1 (fr) | 1998-08-06 |
Family
ID=9503158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/000115 WO1998034037A1 (fr) | 1997-01-31 | 1998-01-23 | Roulement et palier comportant un insert de compensation thermique |
Country Status (6)
Country | Link |
---|---|
US (1) | US6273614B1 (fr) |
EP (1) | EP0956456B1 (fr) |
JP (1) | JP2001511235A (fr) |
DE (1) | DE69840493D1 (fr) |
FR (1) | FR2759129B1 (fr) |
WO (1) | WO1998034037A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1167787A3 (fr) * | 2000-06-19 | 2003-01-22 | Minebea Kabushiki Kaisha | Dispositif de palier |
DE102005027897A1 (de) * | 2005-06-16 | 2006-12-21 | Schaeffler Kg | Rollenlager |
EP1803947A1 (fr) * | 2005-12-15 | 2007-07-04 | IMO Momentenlager GmbH | Palier à roulement sans jeu |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6293704B1 (en) * | 2000-03-21 | 2001-09-25 | The Timken Company | Shaft mounting with enhanced stability |
US7175350B2 (en) * | 2004-03-17 | 2007-02-13 | The Timken Company | Thermally compensated bearing system |
US7175560B2 (en) * | 2005-01-20 | 2007-02-13 | American Axle & Manufacturing, Inc. | Thermally compensating bearing preload arrangement in axle assembly |
DE102005019482B4 (de) * | 2005-04-27 | 2008-10-30 | Ab Skf | Kegelrollenlager |
DE102005019481B4 (de) * | 2005-04-27 | 2012-03-01 | Ab Skf | Kegelrollenlager |
DE102005043954A1 (de) * | 2005-09-15 | 2007-03-22 | Schaeffler Kg | Radialwälzlager, insbesondere einreihiges Zylinderrollenlager für das Loslager einer Werkzeugmaschinen-Hauptspindel |
DE102005043945A1 (de) * | 2005-09-15 | 2007-03-22 | Schaeffler Kg | Radialwälzlager, insbesondere einreihiges Schrägkugellager für das Festlager einer Werkzeugmaschinen-Hauptspindel |
US7318759B2 (en) * | 2006-06-07 | 2008-01-15 | Honeywell International, Inc. | Preload system for bearings in a waterjet propulsion apparatus |
US8678665B2 (en) * | 2007-03-08 | 2014-03-25 | Twin Disc., Inc. | Bearing arrangement for heavy duty marine transmission |
DE102007018928A1 (de) * | 2007-04-21 | 2008-10-23 | Schaeffler Kg | Kompensationsvorrichtung |
DE102007020521A1 (de) * | 2007-05-02 | 2008-11-06 | Schaeffler Kg | Kompensationsvorrichtung |
DE102007045655A1 (de) * | 2007-09-25 | 2009-04-02 | Schaeffler Kg | Vorrichtung zum Ausgleich axialer Wärmedehnungen einer Wälzlageranordnung |
BRPI0919692A2 (pt) * | 2008-10-24 | 2015-12-08 | Twin Disc Inc | transmissão para serviço pesado |
DE102010011280A1 (de) | 2010-03-13 | 2011-09-15 | Schaeffler Technologies Gmbh & Co. Kg | Wälzlager mit einem Lagerring, dessen Profilierung dynamisch der Lagerbelastung anpassbar ist, sowie zugehöriges Verfahren |
US8591120B2 (en) * | 2010-10-27 | 2013-11-26 | Schaeffler Technologies AG & Co. KG | Rolling bearing |
DE102010052842A1 (de) | 2010-11-29 | 2012-05-31 | Schaeffler Technologies Gmbh & Co. Kg | Wälzlager zur Aufnahme von Axial- und Radialbelastungen |
JP2012237251A (ja) * | 2011-05-12 | 2012-12-06 | Mitsubishi Heavy Ind Ltd | スクロール型流体機械 |
WO2014057303A1 (fr) * | 2012-10-10 | 2014-04-17 | Aktiebolaget Skf | Palier à roulement comprenant un logement ayant deux parties et procédé permettant de fabriquer et d'installer un tel palier |
US20140251056A1 (en) * | 2013-03-06 | 2014-09-11 | Agilent Technologies, Inc. | Robotic arm assembly with angular contact cartridge bearings |
DE102013004499A1 (de) | 2013-03-14 | 2014-09-18 | Minebea Co., Ltd. | Lagersystem |
EP3084242A1 (fr) * | 2013-12-19 | 2016-10-26 | Solvay Specialty Polymers USA, LLC. | Ensemble roulement et procédé |
DE102015222542A1 (de) | 2015-11-16 | 2017-05-18 | Schaeffler Technologies AG & Co. KG | Gehäuse mit einem Wälzlager |
US10087986B2 (en) * | 2016-10-18 | 2018-10-02 | Aktiebolaget Skf | Temperature compensation ring as well as bearing ring with the temperature compensation ring |
DE102019108603A1 (de) * | 2019-04-02 | 2020-10-08 | Bayerische Motoren Werke Aktiengesellschaft | Vorrichtung zur Kompensation eines unterschiedlichen Wärmeausdehnungsverhaltens |
US11028875B1 (en) * | 2020-03-25 | 2021-06-08 | American Axle & Manufacturing, Inc. | Assembly with a housing and an outer bearing race that are formed of dissimilar metals, the assembly being configured to retain the outer bearing race to the housing over a range of temperatures |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2324676A (en) * | 1941-06-06 | 1943-07-20 | Chrysler Corp | Bearing |
US3311431A (en) * | 1964-08-07 | 1967-03-28 | Irving W Hilliard | Temperature compensating bearing assembly |
DE1907897A1 (de) * | 1968-02-16 | 1969-10-09 | Roulements Soc Nouvelle | Kugel-,Zylinder- oder Kegelrollenlager |
FR2135903A5 (fr) * | 1970-05-22 | 1972-12-22 | Skf Kugellagenfabriken | |
DE2131593A1 (de) * | 1971-06-25 | 1972-12-28 | Schaeffler Ohg Industriewerk | Einstellbares Waelzlager |
EP0448239A2 (fr) * | 1990-03-21 | 1991-09-25 | The Timken Company | Machine comportant des paliers à compensation thermique |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2244197A (en) * | 1936-03-25 | 1941-06-03 | Hessler Christian Rudolph | Bearing |
US2141145A (en) * | 1938-02-21 | 1938-12-20 | Timken Roller Bearing Co | Cushioned roller bearing and mounting |
FR95734E (fr) * | 1966-11-15 | 1971-06-04 | Pitner Alfred | Roulement a aiguilles sans jeu. |
SE334781B (fr) * | 1967-12-07 | 1971-05-03 | Skf Svenska Kullagerfab Ab | |
US3801171A (en) * | 1972-06-30 | 1974-04-02 | Heim Universal Corp | Preloading anti-friction bearing assembly |
FR2594189B1 (fr) * | 1986-02-07 | 1988-05-27 | Nadella | Roulement a billes a precontrainte et procede et outil pour sa fabrication |
-
1997
- 1997-01-31 FR FR9701051A patent/FR2759129B1/fr not_active Expired - Fee Related
-
1998
- 1998-01-23 US US09/355,325 patent/US6273614B1/en not_active Expired - Fee Related
- 1998-01-23 DE DE69840493T patent/DE69840493D1/de not_active Expired - Lifetime
- 1998-01-23 WO PCT/FR1998/000115 patent/WO1998034037A1/fr active Application Filing
- 1998-01-23 JP JP53257898A patent/JP2001511235A/ja not_active Ceased
- 1998-01-23 EP EP98903106A patent/EP0956456B1/fr not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2324676A (en) * | 1941-06-06 | 1943-07-20 | Chrysler Corp | Bearing |
US3311431A (en) * | 1964-08-07 | 1967-03-28 | Irving W Hilliard | Temperature compensating bearing assembly |
DE1907897A1 (de) * | 1968-02-16 | 1969-10-09 | Roulements Soc Nouvelle | Kugel-,Zylinder- oder Kegelrollenlager |
FR2135903A5 (fr) * | 1970-05-22 | 1972-12-22 | Skf Kugellagenfabriken | |
DE2131593A1 (de) * | 1971-06-25 | 1972-12-28 | Schaeffler Ohg Industriewerk | Einstellbares Waelzlager |
EP0448239A2 (fr) * | 1990-03-21 | 1991-09-25 | The Timken Company | Machine comportant des paliers à compensation thermique |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1167787A3 (fr) * | 2000-06-19 | 2003-01-22 | Minebea Kabushiki Kaisha | Dispositif de palier |
DE102005027897A1 (de) * | 2005-06-16 | 2006-12-21 | Schaeffler Kg | Rollenlager |
EP1803947A1 (fr) * | 2005-12-15 | 2007-07-04 | IMO Momentenlager GmbH | Palier à roulement sans jeu |
Also Published As
Publication number | Publication date |
---|---|
EP0956456A1 (fr) | 1999-11-17 |
JP2001511235A (ja) | 2001-08-07 |
DE69840493D1 (en) | 2009-03-12 |
US6273614B1 (en) | 2001-08-14 |
EP0956456B1 (fr) | 2009-01-21 |
FR2759129A1 (fr) | 1998-08-07 |
FR2759129B1 (fr) | 1999-03-05 |
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