WO2000077268A2 - Composant de transmission variable a l'infini - Google Patents

Composant de transmission variable a l'infini Download PDF

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Publication number
WO2000077268A2
WO2000077268A2 PCT/NL2000/000418 NL0000418W WO0077268A2 WO 2000077268 A2 WO2000077268 A2 WO 2000077268A2 NL 0000418 W NL0000418 W NL 0000418W WO 0077268 A2 WO0077268 A2 WO 0077268A2
Authority
WO
WIPO (PCT)
Prior art keywords
disk
ivt
steel
rollers
component
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.)
Ceased
Application number
PCT/NL2000/000418
Other languages
English (en)
Other versions
WO2000077268A3 (fr
Inventor
John Michael Beswick
Aidan Michael Kerrigan
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 Engineering and Research Centre BV
Original Assignee
SKF Engineering and Research Centre BV
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 Engineering and Research Centre BV filed Critical SKF Engineering and Research Centre BV
Priority to AU57148/00A priority Critical patent/AU5714800A/en
Priority to EP00942541A priority patent/EP1204827A2/fr
Priority to KR1020017015998A priority patent/KR20020012606A/ko
Priority to JP2001503707A priority patent/JP2003502496A/ja
Publication of WO2000077268A2 publication Critical patent/WO2000077268A2/fr
Publication of WO2000077268A3 publication Critical patent/WO2000077268A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members

Definitions

  • the invention relates to a transmission component comprising a Powder Metallurgy type high alloy steel.
  • a transmission component is known from EP-0462637A.
  • a continious variable transmission is shown wherein a belt extends between two pulley's of varying effective diameter. At least one contact surface of a pully with the belt is covered with a layer realised through Powder Metallurgy. Starting from a base pulley, such layer is arranged during a later stage of manufacturing.
  • Operational conditions of continous variable transmission show relatively low contact pressure between the belt and the pully. Operation is generally dry i.e. without the presence of a lubricant.
  • the invention relates to an IVT component.
  • IVT IVT of the toro ⁇ dal type and more particular the disk or rollers thereof.
  • the contact surfaces of the disks, rollers respectively are subjected to high contact loadings under conditions wherein a lubricant is present.
  • the contact pressure is considerably higher between the circumferential surface of the powder roller and raceway of the disk.
  • High contact fatigue strength requirements are set as well as a requirement for static load capacity, without a lubrication film being present. It has been found that an ordinary rolling bearing steel does not meet these requirements.
  • the invention aims to provide a component which has improved properties making it particular suitable for IVT disk and power roller components.
  • said transmission component comprises a disk or roller of a toro ⁇ dal type IVT being integrally shaped through
  • Integrally shaped is to be understood as fully comprising PM material. This in contrast to EP-0462637 wherein only a layer of PM material is provided. Only through integral manufacturing of a IVT component such as a disk and more preferably a power roller sufficient service life can be realised at the high contact fatigue loads revealing.
  • the invention is particularly used for the manufacturing of power rollers of an INT. More particular the composition of the steel used for the IVT component comprises
  • a PM M62 type steel comprising:
  • the power metallurgy steel can be produced with any method known in the art. As example the following steps are given:
  • powder metallurgy high alloy steels are subjected to a secondary hardening treatment.
  • this is realised through austenising at 1205 ⁇ 5°C for 5-10 minutes followed by gas, oil or salt quenching and -tempering at about 550 °C.
  • the hardness can be as high as 67 HRC with high temperature hardness properties.
  • Fig. 1 shows an example of an IVT
  • Fig. 2 shows a comparative graph for the contact stress
  • Fig. 3 shows a comparative graph for blunt notch toughness.
  • the CVT/IVT comprises input disks 1 connected to the output shaft of an engine and an opposed output disk 2 connected to a drive chain or further gear box components of a vehicle or any other item which has to be driven with a variable ratio.
  • Power rollers 3 can be journalled on any shaft and the axis thereof is indicated by 4. This shaft can make a rotational movement in the sense of arrow 5. Through rotation of other rollers in the sense of arrow 5 the transmission ratio between the input and output disk will change. As shown in fig.
  • each power roller as well as the raceways 8 and 9 are subjected to considerable loadings. Probably this is one of the reasons that up to now this technique was not generally accepted.
  • the maximum contact stress between the circumferential surface of the power rollers and the related raceway could be as high as 4 GPa. This is far higher than the contact pressure encountered in usual rolling bearings.
  • the tilting movement according to arrow 5 introduces slip of the rollers relative to the disks. Such a slip is not present in rolling bearings. Fatigue cracking and fracture due to repetitive bending stresses have been reported. The area of the disk within circle 11 is particular vulnerable. This means that the combined rolling contact fatigue strength of the traction surfaces (raceways) and fatigue fracture strength should be improved.
  • Fig. 2 shows the rolling contact fatique life at different contact stresses.
  • the usual rolling bearing steel ASTM A295 52100 (dotted line) is compared with the steel according to the invention PM M62 (continuous line).
  • the number of cycle's (L50) is in million stress cycles.
  • L50 the number of cycle's
  • -.. is a 52100 steel whilst - ⁇ - shows PM M62. From this figure it is clear that in spite of the very high hardness of the PM M62 steel (67 HRC) , the toughness is no less than standard martensitic 52100 rolling bearing steel.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Rolling Contact Bearings (AREA)
  • Friction Gearing (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un composant de transmission variable à l'infini qui comprend un disque d'entrée et un disque de sortie. Chaque disque est pourvu d'un chemin de roulement, les chemins de roulement du disque d'entrée et ceux du disque de sortie se faisant face. Des galets sont placés entre ces disques, qui possèdent une surface entrant en prise avec les chemins de roulement, et l'on peut changer la position des galets d'entraînement par rapport aux disques afin de modifier le rapport de transmission entre les disques. Au moins un des disques et de galets d'entraînement est fait à partir de l'acier de type PM M62.
PCT/NL2000/000418 1999-06-15 2000-06-15 Composant de transmission variable a l'infini Ceased WO2000077268A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU57148/00A AU5714800A (en) 1999-06-15 2000-06-15 Ivt component
EP00942541A EP1204827A2 (fr) 1999-06-15 2000-06-15 Composant de transmission variable a l'infini
KR1020017015998A KR20020012606A (ko) 1999-06-15 2000-06-15 무한 가변 변속기 부품
JP2001503707A JP2003502496A (ja) 1999-06-15 2000-06-15 Ｉｖｔ構成部品

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1012328A NL1012328C2 (nl) 1999-06-15 1999-06-15 CVT/IVT-onderdeel.
NL1012328 1999-06-15

Publications (2)

Publication Number Publication Date
WO2000077268A2 true WO2000077268A2 (fr) 2000-12-21
WO2000077268A3 WO2000077268A3 (fr) 2001-06-28

Family

ID=19769380

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2000/000418 Ceased WO2000077268A2 (fr) 1999-06-15 2000-06-15 Composant de transmission variable a l'infini

Country Status (7)

Country Link
EP (1) EP1204827A2 (fr)
JP (1) JP2003502496A (fr)
KR (1) KR20020012606A (fr)
CN (1) CN1355874A (fr)
AU (1) AU5714800A (fr)
NL (1) NL1012328C2 (fr)
WO (1) WO2000077268A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110230306A1 (en) * 2008-05-07 2011-09-22 Robert Andrew Oliver Variator
US8152687B2 (en) 2007-01-24 2012-04-10 Torotrack (Development) Limited Powdered metal variator components

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1016811C2 (nl) 2000-12-06 2002-06-13 Skf Ab Wentellager omvattende een met poedermetallurgietechniek verkregen onderdeel.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516963A (en) * 1983-05-23 1985-05-14 Borg-Warner Corporation Power transmission chain-belt
JP2777373B2 (ja) * 1988-06-28 1998-07-16 日産自動車株式会社 耐熱耐摩耗性鉄基焼結合金
NL9001392A (nl) * 1990-06-19 1992-01-16 Volvo Car Bv Poelieschijfsamenstel voor een van een flexibel overbrengingsorgaan voorziene transmissie.
JPH05132743A (ja) * 1991-11-09 1993-05-28 Daido Steel Co Ltd 軸 受
JPH05239602A (ja) * 1992-02-25 1993-09-17 Daido Steel Co Ltd 高面圧部品
JP3241491B2 (ja) * 1993-06-29 2001-12-25 大同特殊鋼株式会社 高温高速回転用転がり軸受

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8152687B2 (en) 2007-01-24 2012-04-10 Torotrack (Development) Limited Powdered metal variator components
US9850998B2 (en) 2007-01-24 2017-12-26 Torotrak (Development) Limited Powered metal variator components
US20110230306A1 (en) * 2008-05-07 2011-09-22 Robert Andrew Oliver Variator

Also Published As

Publication number Publication date
JP2003502496A (ja) 2003-01-21
NL1012328C2 (nl) 2000-12-22
AU5714800A (en) 2001-01-02
WO2000077268A3 (fr) 2001-06-28
NL1012328A1 (nl) 2000-12-19
KR20020012606A (ko) 2002-02-16
CN1355874A (zh) 2002-06-26
EP1204827A2 (fr) 2002-05-15

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