WO2013002633A1 - Procédé de fabrication d'un composant annulaire de courroie d'entraînement - Google Patents

Procédé de fabrication d'un composant annulaire de courroie d'entraînement Download PDF

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Publication number
WO2013002633A1
WO2013002633A1 PCT/NL2012/000042 NL2012000042W WO2013002633A1 WO 2013002633 A1 WO2013002633 A1 WO 2013002633A1 NL 2012000042 W NL2012000042 W NL 2012000042W WO 2013002633 A1 WO2013002633 A1 WO 2013002633A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
oven chamber
hydrogen gas
ring
ammonia
Prior art date
Application number
PCT/NL2012/000042
Other languages
English (en)
Inventor
Wilhelmus Petrus Maria JANSSEN
Arjen BRANSMA
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201280032754.4A priority Critical patent/CN103732782A/zh
Priority to MX2013015262A priority patent/MX340810B/es
Priority to JP2014518842A priority patent/JP2014520957A/ja
Publication of WO2013002633A1 publication Critical patent/WO2013002633A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • 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
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/16—V-belts, i.e. belts of tapered cross-section consisting of several parts

Definitions

  • the present invention relates to a manufacturing method for an endless, thin and flexible metal band, which band is typically incorporated in a drive belt for power transmission between two adjustable pulleys of the well-known continuously variable transmission or CVT applied in motor vehicles.
  • Such a drive belt and its ring component are generally known, e.g. from EP-A-1 403 551.
  • a number of such ring components are incorporated in at least one, but typically two laminated, i.e. mutually concentrically arranged sets thereof.
  • the known pushbelt further comprises a number of transverse metal elements that are slidably mounted on such ring set or sets.
  • the ring components are typically produced from maraging steel and in manufacturing are, at least, subjected to the heat treatments of aging and nitriding to provide these with extraordinary fatigue strength and wear resistance properties. More, in particular, a surface layer of the ring components is strengthened by gas-soft nitriding, whereby (interstitial) nitrogen atoms are introduced in the outer layers of the atomic lattice of the maraging steel by diffusion.
  • the gas-soft nitriding process entails keeping the ring components at high temperature in an ammonia gas containing oven chamber. In the gas-soft nitriding the ammonia gas dissociates at the surface of the ring component into hydrogen gas and nitrogen atoms that can enter into the metal lattice of the rings by diffusion.
  • the known gas-soft nitriding process is to reduce the intensity thereof in terms of, at least, the ammonia concentration in the process atmosphere, as much as possible.
  • the usage (and cost) of ammonia gas, as part of the process gas mixture with nitrogen may be favourably reduced, but also the formation of detrimental iron-nitrides compounds, such as Fe 4 N, in the surface layer of the ring components may be more effectively avoided thereby.
  • This so-called compound layer usually renders the ring components too brittle for the drive intended drive belt application thereof.
  • lowering the said intensity of the gas soft nitriding substantially increases the risk that substantial fluctuations occur in the thickness of the nitrided surface layer(s) formed therein, because the comparatively low ammonia concentration in the overall process atmosphere fluctuates more easily and more substantially.
  • lowering the said intensity will, typically, disadvantageously increase the process time required to realise a given nitrided surface layer thickness.
  • the above goal may be realised by actively controlling the chemical reaction occurring in the process atmosphere of the gas-soft nitriding process, namely:
  • the said active control is based on the equilibrium constant K N of the above-mentioned nitriding reaction in the gas phase (1):
  • K N (p[NH 3 ])/(p[H 2 ] A1 5 ) (2) wherein p[X] represent the partial pressure in the process atmosphere of the compound X and effectively entails keeping such equilibrium constant K N at a prescribed desired value chosen from within the range between 0.5 and 50 bar "1 ⁇ 2 in dependence on the process temperature at which the gas-soft nitriding is effected. Indeed, it has been observed that, as the said process temperature increases, the said detrimental compound layer is increasingly more easily formed, i.e. a lower equilibrium constant K N is required for avoiding that such compound layer is formed.
  • the process temperature of between 465 and 515 degrees Centigrade combined with the equilibrium constant K N being set between 1 and 11 at 465 degrees Centigrade and between 1 and 3 at 515 degrees Centigrade is considered the optimum process setting of the gas-soft nitriding process in accordance with the present invention, at least for a specific maraging steel base material (see figure 7 for suitable settings of the equilibrium constant K N in-between these two extreme values).
  • the process atmosphere is further preferably composed of around 5 to 25 volume-% ammonia gas with balance nitrogen gas.
  • the hydrogen gas supplied to the process atmosphere is obtained from ammonia, in particular by dissociating or cracking the ammonia gas at elevated temperature in an ammonia cracker to produce hydrogen gas and nitrogen gas according to the above nitriding reaction (1).
  • the gas-soft nitriding process allows the gas-soft nitriding process to be conducted with only a single source for the process gas, namely pure ammonia gas or, more practically, a mixture thereof with nitrogen gas.
  • Figure 1 provides a schematic perspective view of a continuously variable transmission with a drive belt running over two pulleys.
  • Figure 2 is a schematic illustration of a part of the known drive belt shown in perspective, which part includes two ring sets, each including a number of concentrically arranged metal ring components, as well as a plurality of transverse members.
  • Figure 3 diagrammatically resents an overview of a part of the known drive belt manufacturing method, including a process step of gas-soft nitriding of the drive belt ring component.
  • Figure 4 shows the known process step of gas-soft nitriding in more detail.
  • Figure 5 diagrammatically represents a modified, novel gas-soft nitriding process step that illustrates the basic concept of the invention.
  • Figure 6 diagrammatically represents a further elaboration of the gas-soft nitriding process step in accordance with the invention.
  • Figure 7 is a graph of possible iron-nitride formation in dependence on process settings of the gas-soft nitriding process.
  • Figure 1 schematically shows the central parts of a continuously variable transmission or CVT that is commonly applied in the drive line of motor vehicles between the engine and the drive wheels thereof.
  • the transmission comprises two pulleys 1 , 2, each provided with two conical pulley discs 4, 5, where between a predominantly V-shaped pulley groove is defined and whereof one disc 4 is axially moveable along a respective pulley shaft 6, 7 over which it is placed.
  • a drive belt 3 is wrapped around the pulleys 1 , 2, while being held by friction, i.e. clamped between the pulley discs 4, 5 thereof, for transmitting a torque T and an accompanying rotational movement ⁇ from the one pulley 1 , 2 to the other 2, 1.
  • the running radii R of the drive belt 3 between the discs 4, 5 of the respective pulleys 1 , 2 determine the (speed) ratio "i" of the CVT, i.e. the ratio between the rotational speeds of the respective pulleys 1 , 2.
  • This CVT and its principal operation are known per se.
  • FIG. 1 An example of a known drive belt 3 is shown in more detail figure 2 in a section thereof, which belt 3 is shown to incorporate two endless carriers 31 , or ring sets 31 , that are each composed of a number of concentrically arranged, i.e. mutually nested individual ring components 32.
  • the drive belt 3 further comprises a plurality of platelike transverse members 30 that are in contact with and held together by the ring sets 31.
  • the transverse members 30 take-up the clamping force exerted between the discs 4, 5 of each pulley 1 , 2 via pulley contact faces 33 that are provided on either lateral side thereof.
  • each transverse member 30 represents the transition between a radially outer part of constant thickness and a tapered radial inner part thereof. This rocking edge 34 and tapered shape of the transverse members 30 is what allows the drive belt 3 to follow a smoothly curved trajectory.
  • the drive belt 3 and in particular its ring components 32 are subjected to a cyclically varying tensile and bending stresses, i.e. a fatigue load.
  • a fatigue load i.e. the resistance against fatiguing or fatigue strength of the ring component 32 thus determines the functional life span of the drive belt 3 at a given torque T to be transmitted thereby. Therefore, it has been a long standing general aim in the development of the drive belt manufacturing method to realise a required ring fatigue strength at a minimum combined material and processing cost.
  • Figure 3 illustrates a relevant part of the known manufacturing method for the ring set 31 of the drive belt 3, as it is practised since the early years of drive belt production for, in particular, automotive application.
  • the separate process steps are indicated by way of Roman numerals.
  • a thin sheet or plate 11 of a maraging steel base material having a thickness of around 0.4 mm is bend into a cylindrical shape and the meeting plate ends 12 are welded together in a second process step II to form a hollow cylinder or tube 13.
  • the tube 13 is annealed.
  • the tube 13 is cut into a number of annular hoops 14, which are subsequently -process step five V- rolled to reduce the thickness thereof to, typically, 0.2 mm, while being elongated.
  • the hoops 14 are usually referred to as a drive belt ring component 32.
  • the ring component 32 is subjected to a further, i.e. ring annealing process step VI for removing the work hardening effect of the previous rolling process step by recovery and re-crystallization of the ring material at a temperature considerably above 600 degree Celsius, e.g. about 800 degree Celsius.
  • a seventh process step VII the ring component 32 is calibrated by mounting it around two rotating rollers and stretching it to a predefined circumference length by forcing the said rollers apart.
  • this seventh process step VII also internal stresses are imposed on the ring component 32.
  • the ring component 32 is heat-treated in two separate process steps, namely an eighth process step VIII of ageing or bulk precipitation hardening and a ninth process step IX of nitriding or case hardening. More in particular, both such heat-treatments involve heating the ring component 32 in an oven chamber 50 containing a controlled gas atmosphere, i.e. the respective process atmosphere.
  • a controlled gas atmosphere i.e. the respective process atmosphere.
  • process atmosphere is typically composed of nitrogen and some, e.g. up to 5 volume-%, hydrogen.
  • nitriding such process atmosphere also contains ammonia gas that decomposes at the surface of the ring component into hydrogen gas and nitrogen atoms. These nitrogen atoms enter, i.e. diffuse into the metal lattice of the ring component providing such with wear resistant and hardened nitrided surface layer.
  • Both these heat-treatments typically occur within the temperature range from 400 degrees Celsius to 500 degrees Celsius and can each last for about 45 to over 120 minutes in dependence on the base material (maraging steel alloy composition) for the ring component 32, as well as on the mechanical properties desired therefor.
  • it is aimed at a ring core hardness value of 520 HV1.0 or more, a ring surface hardness value of 875 HV0.1 or more and at a thickness of the nitrided surface layer, alternatively denoted nitrogen diffusion zone, in the range from 25 to 35 micron.
  • the ring set 31 is formed by radially stacking, i.e. concentrically nesting, a number of thus formed and processed ring components 32, as is further indicated in figure 3 in the tenth and final process step X depicted therein. Since only a small positive or negative clearance is allowed between neighbouring ring components 32, each ring component ring 32 of the ring set 31 is required to be suitably dimensioned in relation to the other ring components 32 thereof. To this end, the individual ring components 32 of the ring set 31 are selected from a stock of ring components 32 of different, however, accurately known circumference length.
  • the ninth process step IX of gas-soft nitriding is illustrated in somewhat more detail.
  • the oven chamber 50 is shown to be supplied with process gas composed of a mixture of nitrogen and ammonia gas via supply line 51 and (regulator) valve 52.
  • This supply of process gas results in a corresponding discharge of the process atmosphere in the oven chamber 50 via a discharge line 53.
  • any such process atmosphere that is expelled from the oven chamber 50 is burned- off. It will be clear that due to such supply of "fresh” process gas and such discharge of "used” process atmosphere, the composition of the process atmosphere will not be homogenous throughout the oven chamber 50.
  • the opening and closing of doors 54 for the charging and discharging of ring components 32 disturbs the process atmosphere as well.
  • the resulting the nitrided surface layer of the ring component 32 may not be evenly formed, which shortcoming of the known gas-soft nitriding process aggravates when the overall ammonia concentration in the process atmosphere becomes smaller. Still, a low ammonia concentration is to be favoured from a process efficiency perspective.
  • the homogeneity and/or consistency of the nitrided surface layer of the ring component can be favourably and substantially improved, especially at a relatively low overall ammonia concentration in the process atmosphere, if the oven chamber 50 is not only supplied with ammonia gas, but also with hydrogen gas.
  • This novel setup of the ninth process step IX of gas-soft nitriding in the manufacturing method of the ring set 31 is illustrated in figure 5 and includes a further supply line 55 and associated (regulator) valve 56 for the controlled supply of hydrogen gas, i.e. in addition to the controlled supply of ammonia gas via supply line 51 and associated (regulator) valve 52.
  • the amount of hydrogen gas that is supplied to the process atmosphere is controlled based on the measured hydrogen content in the process atmosphere to a desired value that is chosen from within the range between 5 and 15 volume-%, e.g. 10 volume-%.
  • the effectiveness of the novel gas-soft nitriding process may be improved by obtaining the hydrogen process gas from dissociating the ammonia process gas, as schematically illustrated in figure 6.
  • the ammonia containing process is supplied not only directly to the oven chamber 50, but also to an ammonia cracker 57 to produce hydrogen gas.
  • the effectiveness of the novel gas-soft nitriding process may be improved by applying a high temperature in the oven chamber 50.
  • iron-nitrides are more easily formed, i.e. at an increasingly smaller value of the equilibrium constant K N of the nitriding reaction (1), as such process temperature increases. These iron-nitrides are harmful as they inhibit the progress of the nitriding process and also can form a brittle surface layer of the ring component 32 that diminishes the fatigue strength thereof.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un anneau métallique sans fin (32) pour une courroie d'entraînement qui convient pour la transmission de puissance dans une transmission à variation continue, qui comprend au moins une étape de traitement (IX) permettant la nitruration ou la cémentation de l'anneau (32) dans une chambre de four (50) qui contient une atmosphère de traitement qui est alimentée à la fois en ammoniac et en hydrogène gazeux. De préférence, au moins la teneur volumique relative en hydrogène gazeux présent dans la chambre de four (50) est réglée de façon active à une valeur souhaitée.
PCT/NL2012/000042 2011-06-30 2012-06-26 Procédé de fabrication d'un composant annulaire de courroie d'entraînement WO2013002633A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201280032754.4A CN103732782A (zh) 2011-06-30 2012-06-26 传动带的环部件的制造方法
MX2013015262A MX340810B (es) 2011-06-30 2012-06-26 Metodo de fabricacion para un componente de anillo de banda de transmision.
JP2014518842A JP2014520957A (ja) 2011-06-30 2012-06-26 駆動ベルトのリング部品のための製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1038911 2011-06-30
NL1038911 2011-06-30

Publications (1)

Publication Number Publication Date
WO2013002633A1 true WO2013002633A1 (fr) 2013-01-03

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JP (1) JP2014520957A (fr)
CN (1) CN103732782A (fr)
MX (1) MX340810B (fr)
WO (1) WO2013002633A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1040395C (en) * 2013-09-19 2015-03-23 Bosch Gmbh Robert Flexible steel ring for a drive belt for a continuously variable transmission and method for producing such.
NL1040567C2 (en) * 2013-12-24 2015-06-26 Bosch Gmbh Robert Manufacturing method for a drive belt metal ring component and metal ring manufactured in accordance therewith.
NL1040566C2 (en) * 2013-12-24 2015-06-26 Bosch Gmbh Robert Method for manufacturing a carrier ring suitable for use in a drive belt for a continuously variable transmission.
WO2017041899A1 (fr) * 2015-09-08 2017-03-16 Robert Bosch Gmbh Élément annulaire métallique d'une courroie d'entraînement pour une transmission variable en continu
WO2018019435A1 (fr) 2016-07-27 2018-02-01 Robert Bosch Gmbh Anneau en acier flexible en acier vieilli thermiquement et pourvu d'une couche de surface nitrurée

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6287390B2 (ja) * 2014-03-13 2018-03-07 新日鐵住金株式会社 低合金鋼のガス軟窒化処理方法
WO2021181570A1 (fr) * 2020-03-11 2021-09-16 日本製鉄株式会社 Article traité par nitruration gazeuse douce et son procédé de production

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DE2734219A1 (de) * 1977-07-29 1979-02-08 Bbc Brown Boveri & Cie Mess- und regelanordnung fuer eine nitrier-atmosphaere
DE3706257C1 (en) * 1987-02-26 1988-04-21 Mtu Muenchen Gmbh Process and device for producing surface layers on iron-containing components
DE19652125C1 (de) * 1996-12-14 1998-04-30 Volker Dipl Ing Leverkus Verfahren zur Regelung einer Nitrier- bzw. Nitrocarburier-Atmosphäre sowie Vorrichtung zur Durchführung des Verfahrens
EP1055738A2 (fr) 1999-05-28 2000-11-29 Honda Giken Kogyo Kabushiki Kaisha Procédé de fabrication des anneaux laminés et dispositif de traitment thermique utilisé dans ce procédé
EP1403551A1 (fr) 2002-09-30 2004-03-31 Van Doorne's Transmissie B.V. Courroie de transmission et transmission continûment variable l'utilisant
WO2009056169A1 (fr) * 2007-10-31 2009-05-07 Robert Bosch Gmbh Anneau de courroie d'entraînement et procédé de fabrication de celui-ci

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Publication number Priority date Publication date Assignee Title
GB1414746A (en) * 1972-04-13 1975-11-19 Midland Ross Corp Process of nitriding ferrous parts
DE2734219A1 (de) * 1977-07-29 1979-02-08 Bbc Brown Boveri & Cie Mess- und regelanordnung fuer eine nitrier-atmosphaere
DE3706257C1 (en) * 1987-02-26 1988-04-21 Mtu Muenchen Gmbh Process and device for producing surface layers on iron-containing components
DE19652125C1 (de) * 1996-12-14 1998-04-30 Volker Dipl Ing Leverkus Verfahren zur Regelung einer Nitrier- bzw. Nitrocarburier-Atmosphäre sowie Vorrichtung zur Durchführung des Verfahrens
EP1055738A2 (fr) 1999-05-28 2000-11-29 Honda Giken Kogyo Kabushiki Kaisha Procédé de fabrication des anneaux laminés et dispositif de traitment thermique utilisé dans ce procédé
EP1403551A1 (fr) 2002-09-30 2004-03-31 Van Doorne's Transmissie B.V. Courroie de transmission et transmission continûment variable l'utilisant
WO2009056169A1 (fr) * 2007-10-31 2009-05-07 Robert Bosch Gmbh Anneau de courroie d'entraînement et procédé de fabrication de celui-ci

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1040395C (en) * 2013-09-19 2015-03-23 Bosch Gmbh Robert Flexible steel ring for a drive belt for a continuously variable transmission and method for producing such.
WO2015039933A1 (fr) * 2013-09-19 2015-03-26 Robert Bosch Gmbh Anneau souple en acier pour une courroie d'entraînement pour une transmission variable en continu et son procédé de fabrication
NL1040567C2 (en) * 2013-12-24 2015-06-26 Bosch Gmbh Robert Manufacturing method for a drive belt metal ring component and metal ring manufactured in accordance therewith.
NL1040566C2 (en) * 2013-12-24 2015-06-26 Bosch Gmbh Robert Method for manufacturing a carrier ring suitable for use in a drive belt for a continuously variable transmission.
WO2015097292A1 (fr) 2013-12-24 2015-07-02 Robert Bosch Gmbh Procédé de fabrication d'un composant d'anneau métallique de courroie d'entraînement et anneau métallique fabriqué selon celui-ci
WO2015097296A1 (fr) * 2013-12-24 2015-07-02 Robert Bosch Gmbh Procédé de fabrication d'un anneau de support adapté à une utilisation dans une courroie de transmission pour une transmission à variation continue
CN105848823A (zh) * 2013-12-24 2016-08-10 罗伯特·博世有限公司 适于在用于无级变速器的传动带中使用的承载环的制造方法
JP2017509788A (ja) * 2013-12-24 2017-04-06 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ ドライブベルト金属リング構成部品の製造方法および当該製造方法に従って製造された金属リング
WO2017041899A1 (fr) * 2015-09-08 2017-03-16 Robert Bosch Gmbh Élément annulaire métallique d'une courroie d'entraînement pour une transmission variable en continu
NL1041468B1 (en) * 2015-09-08 2017-03-22 Bosch Gmbh Robert Metal ring component of a drive belt for a continuously variable transmisson.
WO2018019435A1 (fr) 2016-07-27 2018-02-01 Robert Bosch Gmbh Anneau en acier flexible en acier vieilli thermiquement et pourvu d'une couche de surface nitrurée

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Publication number Publication date
MX2013015262A (es) 2014-02-27
CN103732782A (zh) 2014-04-16
JP2014520957A (ja) 2014-08-25
MX340810B (es) 2016-07-27

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