EP2782690A1 - Torque transmission assembly for a toroidal variator, a disc and a roller therefor and method of manufacturing thereof - Google Patents

Torque transmission assembly for a toroidal variator, a disc and a roller therefor and method of manufacturing thereof

Info

Publication number
EP2782690A1
EP2782690A1 EP11773010.1A EP11773010A EP2782690A1 EP 2782690 A1 EP2782690 A1 EP 2782690A1 EP 11773010 A EP11773010 A EP 11773010A EP 2782690 A1 EP2782690 A1 EP 2782690A1
Authority
EP
European Patent Office
Prior art keywords
disc
roller
transmission assembly
torque transmission
raceway
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11773010.1A
Other languages
German (de)
French (fr)
Inventor
Patrice Ribault
Yves-André LIVERATO
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.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Publication of EP2782690A1 publication Critical patent/EP2782690A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/02—Producing blanks in the shape of discs or cups as semifinished articles for making hollow articles, e.g. to be deep-drawn or extruded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • 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
    • F16H—GEARING
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/32—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line
    • F16H15/36—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface
    • F16H15/38—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces

Definitions

  • the present invention relates to the field of toroidal variators .
  • a toroidal variator may be used for instance in a supercharger for a combustion engine, in an air conditioning system, in an alternator, in a cooling fan or in a main transmi ssion of a motor vehicle.
  • a toroidal variator i s generally provided with an input di sc and an output disc facing each other and delimiting a toroidal space, and with a plurality of rollers positioned within the toroidal space and coming into engagement contact with raceway s of the input and output di scs to transfer a torque from one di sc to the other.
  • the rollers are arranged so as to be di stributed over the circumference of the toroidal space and can be adj usted spatially within said space in order to adjust the transmi ssion ratio of the variator continuously .
  • Each roller of the toroidal variator is supported by a carriage connected to a control mechani sm allowing said roller to be steered across the raceways of the di scs.
  • the rotational speeds of the input and output discs determine the operating ratio of the variator, whi ch ratio i s by definition the output speed divided by the input speed.
  • Each change of the rollers angular position results in a change of the variator ratio .
  • the manufacture of the di scs and rollers is cost-intensive since the material s used are high- strength steel s. Otherwi se, the contact stresses on the di scs and the rollers may limit the lifetime of the toroidal variator.
  • One aim of the present invention i s to overcome these drawbacks.
  • the torque transmi ssion assembly for a toroidal variator compri ses at least one input di sc and one output di sc each comprising a guiding portion delimiting a raceway, and a plurality of rollers mounted rotatably between the input and output di scs and coming into engagement with said di scs in order to transfer a torque .
  • Each roller compri ses an outer portion delimiting a rolling surface in contact with the raceways .
  • the guiding portion of each di sc has fibre flows extending sub stantially parallel to the associ ated raceway.
  • the outer portion of each roller has fibre flows extending sub stantially parallel to the associated rolling surface.
  • each di sc delimits a toroidal raceway .
  • each roller compri ses a radial portion extended at a large-diameter edge by a curved portion forming the outer portion.
  • rollers there are respectively two, three or four rollers.
  • the input and output di scs are identical.
  • the input and output discs and/or the rollers are made of a metal sheet.
  • the invention provides a method of manufacturing a torque transmi ssion assembly for a toroidal variator compri sing at least an input di sc and an output di sc each compri sing a gui ding portion delimiting a raceway, and a plurality of rollers mounted rotatably between the input and output di scs and coming into engagement with said di scs in order to transfer a torque.
  • Each roller compri ses an outer portion delimiting a rolling surface in contact with the raceways.
  • Said method compri ses the step of forming the guiding portion of each di sc so that the fibre flows of said guiding portion extend sub stantially parallel to the associated raceway .
  • said method compri ses the step of forming the outer portion of each roller so that the fibre flows of said outer portion extend sub stantially parall el to the associated rolling surface.
  • the method compri ses the step of forming each di sc and/or each roller by cutting and stamping a metal sheet.
  • the metal sheet has before and after the step of forming fibre flows extending sub stantially parallel to its maj or faces . Thi s may be the case for instance when the metal sheet is obtained from the rolling of a bloom.
  • the invention provides a di sc for a torque transmi ssion assembly whi ch compri ses a guiding portion delimiting a raceway adapted to cooperate with a plurality of rollers of the torque transmi ssion assembly.
  • the guiding portion of the di sc has fibre flows extending sub stantially parallel to the associated raceway.
  • the invention provi des a roller for a torque transmi ssion assembly which compri ses an outer portion delimiting a rolling surface adapted to cooperate with di scs of the torque transmi ssion assembly .
  • the outer portion of each roller has fibre flows extending sub stantially parallel to the associated rolling surface.
  • Figures 2a to 2c are steps of a method of manufacturing a di sc of the assembly of Figure 1 .
  • Figures 3 a to 3 d are steps of a method of manufacturing a roller of the assembly of Figure 1 .
  • FIG. 1 which illustrates an embodiment of a torque transmi ssion assembly according to the invention
  • said assembly comprises an input di sc 1 mounted on an input shaft 2 and an output di sc 3 mounted on an output shaft 4.
  • the shafts 2, 4 extend along a common axi s 5.
  • the input and output discs 1 , 2 are identical to one another and each compri se a toroidal portion 6, 7 formed around the axi s 5 and delimiting a concave toroidal raceway 6a, 7a.
  • the input and output di scs 1 , 2 axially face each other and a toroidal space 8 i s axially defined between the facing raceways 6a, 7a.
  • Each disc 1, 2 comprises an axial bore 9, 10 into which is mounted the associated shaft 2, 4.
  • the assembly also comprises a plurality of identical rollers 11 positioned within the toroidal space 8 and rolling into contact with both of raceways 6a, 7a.
  • the rollers 11 transmit drive between the raceways 6a, 7a with reversal of direction so that the direction of rotation of shaft 4 is opposite to that of shaft 2.
  • the rollers 11 are arranged so as to be distributed over the circumference of the toroidal space 8.
  • each roller 11 comprises an annular radial portion 11a having an axial bore lib into which is mounted a shaft (not shown) supported by the carriage and extending along the axis 12.
  • Each roller 11 is also provided with a frustoconical portion 11c extending radially outwards from the radial portion 11a and which is extended at a large-diameter edge by an annular radial portion lid, and with an annular curved portion lie extending axially from a large- diameter edge of said radial portion lid.
  • the outer surface of the curved portion lie delimits an annular rolling surface llf in contact with the toroidal raceways 6a, 7a of the input and output shafts.
  • the width of the rolling surface llf can be chosen independently on the roller body wall thickness. Particularly it is possible to keep a wide rolling surface llf while using a small roller thickness. This allows to reduce the weight and the manufacturing time, and also to provide some elastic behaviour of the roller in order to avoid hard points and early failures.
  • the ratio between the diameter of the disc and the diameter of the roller is comprised between 1 and 3, and preferably between 1.5 and 2.
  • the annular disc obtained is pressed by a pressing tool (not shown) so as to form the annular toroidal portion 6 delimiting the raceway 6a and to obtain the final shape of the input disc 1 as shown on Figure 2c.
  • the fibre flows 15 of the toroidal portion 6 remain parallel to the toroidal outer surface of the disc which forms the raceway 6a.
  • the input disc 1 may then be hardened by heat treatment and the raceway 6a may then be finished (for instance by grinding or hard turning) and superfinished (for instance by lapping or honing or vibrofinishing) in order to obtain its geometric characteristics and its definitive surface finish.
  • the output disc 3 is also formed according to this method.
  • a metal sheet 16 obtained by a rolling process, and having fibre flows 17 extending parallel to its major planar faces, is used to obtain a blank as shown on Figure 3a.
  • the metal sheet 16 is cut in a shape of a disc and the bore lib is formed as shown on Figure 3b.
  • the annular disc obtained is pressed by a pressing tool (not shown) so as to form the frustoconical portion 11c, the radial portion lid and an annular outer portion extending axially as shown on Figure 3c.
  • the annular outer portion is slightly curved radially inwards so as to form the annular curved portion lie as shown on Figure 3d.
  • the fibre flows 17 of the curved portion lie remain substantially parallel to the rolling surface llf.
  • the roller 11 may then be hardened by heat treatment and the rolling surface llf may then be fini shed (for instance by grinding or hard turning) and superfini shed (for instance by lapping or honing or vibrofini shing) in order to obtain its geometric characteri stics and its definitive surface fini sh.
  • the di scs have a high fatigue resi stance and an increased lifetime.
  • a machining operation i s foreseen to form the toroidal raceway i s foreseen to form the toroidal raceway.
  • many of the fibre flows of the material of the di scs are interrupted by the machining.
  • the fatigue resi stance of the raceway drops, thus shortening the lifetime.
  • each roller 1 1 has a high fatigue resi stance and an increased lifetime.
  • the di scs 1 , 3 and the rollers 1 1 are formed with a stamping step .
  • a stamping step for instance a spinning step or a forging step, for respectively manufacturing the di scs and the rollers with fibre flows extending sub stantially parallel to the associated raceway and to the associated rolling surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Friction Gearing (AREA)

Abstract

Torque transmission assembly for a toroidal variator The torque transmission assembly for a toroidal variator comprises at least an input disc 1 and an output disc 3 each comprising a guiding portion 6, 7 delimiting a raceway 6a, 7a, and a plurality of rollers 11 mounted rotatably between the input and output discs and coming into engagement with said discs in order to transfer a torque. The guiding portion 6, 7 of each disc has fibre flows extending substantially parallel to the associated raceway 6a, 7a.

Description

TORQUE TRANSMISSION ASSEMBLY FOR A TOROIDAL VARIATOR, A DISC AND A ROLLER THEREFOR AND METHOD OF MANUFACTURING THEREOF
The present invention relates to the field of toroidal variators .
A toroidal variator may be used for instance in a supercharger for a combustion engine, in an air conditioning system, in an alternator, in a cooling fan or in a main transmi ssion of a motor vehicle.
A toroidal variator i s generally provided with an input di sc and an output disc facing each other and delimiting a toroidal space, and with a plurality of rollers positioned within the toroidal space and coming into engagement contact with raceway s of the input and output di scs to transfer a torque from one di sc to the other. The rollers are arranged so as to be di stributed over the circumference of the toroidal space and can be adj usted spatially within said space in order to adjust the transmi ssion ratio of the variator continuously . Each roller of the toroidal variator is supported by a carriage connected to a control mechani sm allowing said roller to be steered across the raceways of the di scs.
The rotational speeds of the input and output discs determine the operating ratio of the variator, whi ch ratio i s by definition the output speed divided by the input speed. Each change of the rollers angular position results in a change of the variator ratio .
The manufacture of the di scs and rollers is cost-intensive since the material s used are high- strength steel s. Otherwi se, the contact stresses on the di scs and the rollers may limit the lifetime of the toroidal variator.
One aim of the present invention i s to overcome these drawbacks.
It is a particular obj ect of the present invention to provide a torque transmi ssion assembly for a toroidal variator which i s simple to manufacture and economic, while guaranteeing an improved lifetime.
In one embodiment, the torque transmi ssion assembly for a toroidal variator compri ses at least one input di sc and one output di sc each comprising a guiding portion delimiting a raceway, and a plurality of rollers mounted rotatably between the input and output di scs and coming into engagement with said di scs in order to transfer a torque . Each roller compri ses an outer portion delimiting a rolling surface in contact with the raceways . The guiding portion of each di sc has fibre flows extending sub stantially parallel to the associ ated raceway. Alternatively or in combination, the outer portion of each roller has fibre flows extending sub stantially parallel to the associated rolling surface.
Advantageously, the guiding portion of each di sc delimits a toroidal raceway .
In one emb odiment, each roller compri ses a radial portion extended at a large-diameter edge by a curved portion forming the outer portion.
In one embodiment, there are respectively two, three or four rollers.
In one preferred embodiment, the input and output di scs are identical.
In one embodiment, the input and output discs and/or the rollers are made of a metal sheet.
In another aspect, the invention provides a method of manufacturing a torque transmi ssion assembly for a toroidal variator compri sing at least an input di sc and an output di sc each compri sing a gui ding portion delimiting a raceway, and a plurality of rollers mounted rotatably between the input and output di scs and coming into engagement with said di scs in order to transfer a torque. Each roller compri ses an outer portion delimiting a rolling surface in contact with the raceways. Said method compri ses the step of forming the guiding portion of each di sc so that the fibre flows of said guiding portion extend sub stantially parallel to the associated raceway . Alternatively or in combination, said method compri ses the step of forming the outer portion of each roller so that the fibre flows of said outer portion extend sub stantially parall el to the associated rolling surface. Advantageously, the method compri ses the step of forming each di sc and/or each roller by cutting and stamping a metal sheet. Preferably, the metal sheet has before and after the step of forming fibre flows extending sub stantially parallel to its maj or faces . Thi s may be the case for instance when the metal sheet is obtained from the rolling of a bloom.
In another aspect, the invention provides a di sc for a torque transmi ssion assembly whi ch compri ses a guiding portion delimiting a raceway adapted to cooperate with a plurality of rollers of the torque transmi ssion assembly. The guiding portion of the di sc has fibre flows extending sub stantially parallel to the associated raceway.
In another aspect, the invention provi des a roller for a torque transmi ssion assembly which compri ses an outer portion delimiting a rolling surface adapted to cooperate with di scs of the torque transmi ssion assembly . The outer portion of each roller has fibre flows extending sub stantially parallel to the associated rolling surface.
The present invention and its advantages will b e better understood by studying the detailed description of a specifi c embodiment given by way of a non-limiting example and illustrated by the appended drawings on which :
- Figure 1 i s a section of a torque transmi ssion assembly for a toroidal variator according to an example of the invention,
- Figures 2a to 2c are steps of a method of manufacturing a di sc of the assembly of Figure 1 , and
- Figures 3 a to 3 d are steps of a method of manufacturing a roller of the assembly of Figure 1 .
As illustrated on Figure 1 , which illustrates an embodiment of a torque transmi ssion assembly according to the invention, said assembly comprises an input di sc 1 mounted on an input shaft 2 and an output di sc 3 mounted on an output shaft 4. The shafts 2, 4 extend along a common axi s 5. The input and output discs 1 , 2 are identical to one another and each compri se a toroidal portion 6, 7 formed around the axi s 5 and delimiting a concave toroidal raceway 6a, 7a. The input and output di scs 1 , 2 axially face each other and a toroidal space 8 i s axially defined between the facing raceways 6a, 7a. Each disc 1, 2 comprises an axial bore 9, 10 into which is mounted the associated shaft 2, 4.
The assembly also comprises a plurality of identical rollers 11 positioned within the toroidal space 8 and rolling into contact with both of raceways 6a, 7a. The rollers 11 transmit drive between the raceways 6a, 7a with reversal of direction so that the direction of rotation of shaft 4 is opposite to that of shaft 2. The rollers 11 are arranged so as to be distributed over the circumference of the toroidal space 8. There are three rollers 11. Each roller 11 rotates around an axis 12 and is supported by a carriage (not shown). When the roller 11 and the associated carriage tilt, the ratio transmitted from the input disc 1 to the output disc 3 varies. When the rollers 11 contact the output disc 3 at a greater radius than that at which it contacts the input disc 1, the output disc rotates slower than the input disc. Conversely, when the corresponding radius at which the rollers 11 contact the input disc 1 is the greater, the output disc 3 rotates faster than the input disc.
With respect to the axis 12, each roller 11 comprises an annular radial portion 11a having an axial bore lib into which is mounted a shaft (not shown) supported by the carriage and extending along the axis 12. Each roller 11 is also provided with a frustoconical portion 11c extending radially outwards from the radial portion 11a and which is extended at a large-diameter edge by an annular radial portion lid, and with an annular curved portion lie extending axially from a large- diameter edge of said radial portion lid. The outer surface of the curved portion lie delimits an annular rolling surface llf in contact with the toroidal raceways 6a, 7a of the input and output shafts. The width of the rolling surface llf can be chosen independently on the roller body wall thickness. Particularly it is possible to keep a wide rolling surface llf while using a small roller thickness. This allows to reduce the weight and the manufacturing time, and also to provide some elastic behaviour of the roller in order to avoid hard points and early failures. The ratio between the diameter of the disc and the diameter of the roller is comprised between 1 and 3, and preferably between 1.5 and 2.
The method of manufacturing such discs and rollers will now be described on the basis of Figures 2a to 2c and Figures 3a to 3d. In the method of manufacturing the input disc, a piece of metal sheet 14 obtained by a rolling process, and having fibre flows 15 extending parallel to its major planar faces, is used to obtain a blank as shown on Figure 2a. The fibre flows 15 are flows of material which are induced during formation of the metal sheet 14. Firstly, the metal sheet 14 is cut in a shape of a disc and then the bore 9 is formed as shown on Figure 2b. Secondly, the annular disc obtained is pressed by a pressing tool (not shown) so as to form the annular toroidal portion 6 delimiting the raceway 6a and to obtain the final shape of the input disc 1 as shown on Figure 2c. After the steps of cutting and stamping, the fibre flows 15 of the toroidal portion 6 remain parallel to the toroidal outer surface of the disc which forms the raceway 6a. The input disc 1 may then be hardened by heat treatment and the raceway 6a may then be finished (for instance by grinding or hard turning) and superfinished (for instance by lapping or honing or vibrofinishing) in order to obtain its geometric characteristics and its definitive surface finish. The output disc 3 is also formed according to this method.
For manufacturing a roller 11, a metal sheet 16 obtained by a rolling process, and having fibre flows 17 extending parallel to its major planar faces, is used to obtain a blank as shown on Figure 3a. In a first step, the metal sheet 16 is cut in a shape of a disc and the bore lib is formed as shown on Figure 3b. Then, the annular disc obtained is pressed by a pressing tool (not shown) so as to form the frustoconical portion 11c, the radial portion lid and an annular outer portion extending axially as shown on Figure 3c. In a third step, the annular outer portion is slightly curved radially inwards so as to form the annular curved portion lie as shown on Figure 3d. After the steps of cutting and stamping, the fibre flows 17 of the curved portion lie remain substantially parallel to the rolling surface llf. The roller 11 may then be hardened by heat treatment and the rolling surface llf may then be fini shed (for instance by grinding or hard turning) and superfini shed (for instance by lapping or honing or vibrofini shing) in order to obtain its geometric characteri stics and its definitive surface fini sh.
For the input and output discs 1 , 3 , with such an orientation of the fibre flows of the toroidal portion relative to the associated raceway, the di scs have a high fatigue resi stance and an increased lifetime. For a conventional input or output disc, a machining operation i s foreseen to form the toroidal raceway. As a result, many of the fibre flows of the material of the di scs are interrupted by the machining. With such a conventional di sc having fibre flows which are broken at the raceway, the fatigue resi stance of the raceway drops, thus shortening the lifetime. Similarly, with the orientation of the fibre flows 17 of the curved portion l i e relative to the rolling surface l l f, each roller 1 1 has a high fatigue resi stance and an increased lifetime.
In the di sclo sed method of manufacturing, the di scs 1 , 3 and the rollers 1 1 are formed with a stamping step . Alternatively, it could al so be possible to foresee another metal working step, for instance a spinning step or a forging step, for respectively manufacturing the di scs and the rollers with fibre flows extending sub stantially parallel to the associated raceway and to the associated rolling surface.
Although the present invention has been illustrated on the basi s of a torque transmi ssion assembly having a single space or cavity within which the rollers are positioned, it shoul d be understood that the invention can al so be applied to a torque transmi ssion assembly having two cavities or even more.

Claims

1. Torque transmission assembly for a toroidal variator comprising at least an input disc (1) and an output disc (3) each comprising a guiding portion (6, 7) delimiting a raceway (6a, 7a), and a plurality of rollers (11) mounted rotatably between the input and output discs and coming into engagement with said discs in order to transfer a torque, each roller comprising an outer portion (lie) delimiting a rolling surface (llf) in contact with the raceways, characterized in that the guiding portion (6, 7) of each disc has fibre flows extending substantially parallel to the associated raceway (6a, 7a), and/or the outer portion (lie) of each roller has fibre flows extending substantially parallel to the associated rolling surface (llf).
2. Torque transmission assembly according to claim 1, wherein the guiding portion (6, 7) of each disc delimits a toroidal raceway (6a, 7a).
3. Torque transmission assembly according to claim 1 or 2, wherein each roller comprises a radial portion (lid) extended at a large-diameter edge by a curved portion forming the outer portion (lie).
4. Torque transmission assembly according to any of the preceding claims, wherein the input and output discs (1, 3) and/or the rollers (11) are made of a metal sheet.
5. Torque transmission assembly according to any of the preceding claims, wherein the input and output discs (1, 3) are identical.
6. Method of manufacturing a torque transmission assembly for a toroidal variator comprising at least an input disc and an output disc each comprising a guiding portion delimiting a raceway, and a plurality of rollers mounted rotatably between the input and output discs and coming into engagement with said discs in order to transfer a torque, each roller comprising an outer portion delimiting a rolling surface in contact with the raceways, characterized in that said method comprises the step of forming the guiding portion of each disc so that the fibre flows of said guiding portion extend substantially parallel to the associated raceway, and/or the step of forming the outer portion of each roller so that the fibre flows of said outer portion extend substantially parallel to the associated rolling surface.
7. Method according to claim 6, comprising the step of forming each disc and/or each roller by cutting and stamping a metal sheet.
8. Method according to claim 7, wherein the metal sheet has, before and after the step of forming, fibre flows extending substantially parallel to its major faces.
9. Disc for a torque transmission assembly, said disc comprising a guiding portion (6) delimiting a raceway (6a) adapted to cooperate with a plurality of rollers of the torque transmission assembly, characterized in that the guiding portion (6) of the disc has fibre flows extending substantially parallel to the associated raceway (6a).
10. Roller for a torque transmission assembly, said roller comprising an outer portion (lie) delimiting a rolling surface (llf) adapted to cooperate with discs of the torque transmission assembly, characterized in that the outer portion (lie) of each roller has fibre flows extending substantially parallel to the associated rolling surface (llf).
EP11773010.1A 2011-10-24 2011-10-24 Torque transmission assembly for a toroidal variator, a disc and a roller therefor and method of manufacturing thereof Withdrawn EP2782690A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/068545 WO2013060352A1 (en) 2011-10-24 2011-10-24 Torque transmission assembly for a toroidal variator, a disc and a roller therefor and method of manufacturing thereof

Publications (1)

Publication Number Publication Date
EP2782690A1 true EP2782690A1 (en) 2014-10-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11773010.1A Withdrawn EP2782690A1 (en) 2011-10-24 2011-10-24 Torque transmission assembly for a toroidal variator, a disc and a roller therefor and method of manufacturing thereof

Country Status (2)

Country Link
EP (1) EP2782690A1 (en)
WO (1) WO2013060352A1 (en)

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
JP3183130B2 (en) * 1995-10-30 2001-07-03 日産自動車株式会社 Cone disk for friction wheel type continuously variable transmission and method of manufacturing the same
JP3237487B2 (en) * 1995-10-30 2001-12-10 日産自動車株式会社 Method of manufacturing friction wheel of friction wheel type continuously variable transmission
JP3758348B2 (en) * 1997-12-26 2006-03-22 日本精工株式会社 Toroidal type continuously variable transmission disk and manufacturing method thereof
JP3918273B2 (en) * 1998-01-26 2007-05-23 日本精工株式会社 Manufacturing method of inner ring and outer ring of power roller bearing of toroidal type continuously variable transmission
DE19817955A1 (en) * 1998-04-22 1999-10-28 Schaeffler Waelzlager Ohg Roller gearing esp. ring winding gear for use in automobiles
DE102008022306A1 (en) * 2008-05-06 2009-11-12 Schaeffler Kg Rolling contact gear, particularly toroidal drive, has continuously variable transmission, and multiple friction wheels arranged between drive disk and driven disk

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013060352A1 *

Also Published As

Publication number Publication date
WO2013060352A1 (en) 2013-05-02

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