WO2016102072A1 - Bande métallique sans fin avec une surface revêtue, courroie d'entraînement pourvue de la bande métallique sans fin et procédé de façonnage de la courroie d'entraînement - Google Patents

Bande métallique sans fin avec une surface revêtue, courroie d'entraînement pourvue de la bande métallique sans fin et procédé de façonnage de la courroie d'entraînement Download PDF

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Publication number
WO2016102072A1
WO2016102072A1 PCT/EP2015/025113 EP2015025113W WO2016102072A1 WO 2016102072 A1 WO2016102072 A1 WO 2016102072A1 EP 2015025113 W EP2015025113 W EP 2015025113W WO 2016102072 A1 WO2016102072 A1 WO 2016102072A1
Authority
WO
WIPO (PCT)
Prior art keywords
endless metal
band
drive belt
metal band
transverse elements
Prior art date
Application number
PCT/EP2015/025113
Other languages
English (en)
Inventor
Joost Johannes Cornelis Jonkers
Francis Maria Antonius Van Der Sluis
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 JP2017534231A priority Critical patent/JP7014603B2/ja
Priority to CN201580070846.5A priority patent/CN107110295B/zh
Publication of WO2016102072A1 publication Critical patent/WO2016102072A1/fr

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
    • 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 invention relates to a drive belt for use with a continuously variable transmission having two variable pulleys, each pulley defining a circumferential V-groove.
  • the drive belt is provided with an endless carrier that typically consists of two band sets, each band set comprising at least one, but usually a number of mutually nested, flexible and endless metal bands and with a number of metal transverse elements arranged on and in sliding relationship with the endless carrier.
  • Each transverse element is provided with one or more cut-outs, each cut-out accommodating a respective band set.
  • a drive belt of this type is known from EP-A-0014013.
  • the transverse element (s) When describing the directions with respect to the drive belt and/or a transverse element thereof, it is always assumed that the transverse element (s) is/are in an upright position, such as is illustrated in Figure 2 in a front view thereof.
  • the circumference or length direction L of the drive belt is at right angles to the plane of the figure.
  • the transverse or width direction W is from left to right and the radial or height direction H is from top to bottom in the plane of Figure 2.
  • the transverse elements are pressed against the inside of the endless carrier at least at the location of the transmission pulleys, whereby the bottom surface of the cut-outs of the transverse element arrive in close contact, in particular a sliding friction contact, with the radial inside surface of the radially innermost band of each band set of the endless carrier, which bottom surfaces are referred to as saddle surfaces hereinafter. It has been proposed in the art to design the said saddle surface thereof with a convex curvature as seen in the width direction of the transverse, i.e. between the front and back of the transverse element.
  • the present disclosure aims to provide a cost effective alternative to the known processes for providing the saddle surface (s) of the transverse elements with a convex curvature.
  • the above aim is realized by providing a coating with abrasive properties at the radial inside of the endless carrier, i.e. to the radial inside surface of the radially innermost band of the band set or band sets thereof.
  • the extent of such abrasion is proportional to the contact force between the transverse elements and the endless carrier and is thus highest, at least initially during operation of the drive belt in the transmission, at the front and back side edges of the saddle surfaces in the most tightly curved part of the drive belt.
  • the saddle surfaces of the transverse elements are ground into a convexly curved shape, favourably without requiring an additional process step to be included in the manufacturing of the transverse element for such purpose.
  • the drive belt after the assembly thereof, is mounted on and around two pulleys, a clamping force is applied by the pulleys onto the drive belt to press the transverse elements thereof against the inside of the endless carrier and the pulleys and drive belt are rotated for a period of time to carry the abrasion process. Only hereafter the drive belt is mounted and used in the continuously variable transmission.
  • the abrasive coating of the endless carrier is expendable, e.g. is abraded itself by the interaction with the saddle surfaces.
  • Another option is to use an abrasive coating that dissolves in the lubricant that is applied in the transmission.
  • the abrasive coating will typically be composed of harder abrasive particles embedded in a softer, (gradually) dissolvable matrix .
  • the rate of abrasion of the saddles surface is not too high. Otherwise, the size of the abraded particles will be too large and/or too much heat will be generated in the abrasion process. Furthermore, the higher the abrasion rate, the less predictable and consistent end-result of the abrasion process can be expected.
  • the abrasion rate is determined in part by the properties of the abrasive coating. For example, the hardness, size and number of abrasive particles of the coating will all influence the rate of abrasion of the saddle surfaces in the transmission that is realised thereby.
  • a particularly favourable solution is found in providing the abrasive coating at only a part of the radial inside surface of the radially innermost band.
  • the abrasive coating may, for example, be applied in the form of one or more strips spanning the width of the said band.
  • the other surfaces of the bands of the band set are relative smooth.
  • these other surfaces are neither provided with the abrasive coating, nor with a surface profile, such as is known from EP 0 014 013 Bl and is currently universally applied in drive belts.
  • the so-called Ra surface roughness according to the ISO standard of these other band surfaces value is preferably 0.1 micron or less. It has namely been observed that, apart from the said convexly curved shape thereof, also a relatively smooth surface with a minimal Ra roughness value is obtained for the saddle surface.
  • Such a smooth saddle surface exerts only a relatively small friction force on the radially innermost band, in which case it is known to be advantageous if also the friction between the bands of the band set themselves is small.
  • figure 1 provides a schematic perspective view of the continuously variable transmission with a drive belt running over two pulleys
  • figure 2 shows a cross section of the known drive belt viewed in the circumference direction thereof;
  • figure 3 provides a width-wise oriented view of a transverse element of the known drive belt
  • figure 4 in a close-up of figures 3 illustrates a design and manufacturing aspect of the transverse element that underlies the present disclosure
  • figure 5 provides a schematic perspective view of first embodiment of a flexible, endless metal band in accordance with the present disclosure
  • figure 6 provides a schematic perspective view of a second embodiment of a flexible, endless metal band in accordance with the present disclosure.
  • figure 7 provides a schematic perspective view of several further embodiments of a flexible, endless metal band in accordance with the present disclosure.
  • FIG. 1 The schematic illustration of a continuously variable transmission in Figure 1 shows a drive belt 3 which runs over two pulleys 1, 2 and which includes an endless band set 31 that carries an essentially contiguous row of transverse elements 32 that are arranged over the circumference of the band set 31.
  • the drive belt 3 and the pulleys 1, 2 are in friction contact, whereto the conical discs 4, 5 of each pulley 1, 2 are urged towards each other thereby exerting respective clamping forces on the drive belt 3.
  • the upper pulley 1 rotates more quickly than the lower pulley 2.
  • the drive belt 3 is shown in a cross section thereof facing in its circumference direction L.
  • This figure 2 shows an embodiment of the drive belt 3 that is equipped with two band sets 31, each shown in cross-section.
  • the band sets 31 carry and guide the transverse elements 32 of the drive belt 3, whereof one transverse element 32 is shown in front elevation in Figure 2.
  • the transverse elements 32 and the band sets 31 of the drive belt 3 are typically made of metal, usually steel.
  • the band sets 31 hold the drive belt 3 together and, in this particular exemplary embodiment, are composed of five individual endless bands 44 each, which endless bands 44 are mutually concentrically nested to form the band set 31. In practice, the band sets 31 often comprise more than five endless bands 44.
  • the transverse elements 32 are able to move, i.e.
  • the transverse element 32 which is also shown in side view in Figure 3, is provided with two cut-outs 33 that are located opposite one another and that open towards opposite sides of the element 32. Each cut-out 33 accommodates a respective one of the two band sets 31.
  • a first or body part 34 of the transverse element 32 extending radially inwards from or, in height direction H, below the band sets 31, a second or neck part 35 of the transverse element 32 being situated in between and at the same (radial) height of the band sets 31 and a third or head part 36 of the transverse element 32 extending radially outwards or, in height direction H, above the band sets 31.
  • the lower or radially inward side of a respective cut-out 33 is delimited by a so-called bearing surface 42 of the body part 34 of the transverse element 32, which bearing surface 42 faces radially outwards or upwards in the general direction of the head part 36.
  • the bearing surfaces 42 contact, i.e. bear on the radially inner circumference of the band sets 31, i.e. on the radially inside surface of the radially innermost band 44i thereof.
  • Lateral side surfaces 37 of the said body part 34 of the transverse element 32 that arrive in contact with the pulley discs 4, 5 are oriented at an angle ⁇ with respect to one another, which corresponds, at least predominantly, to a V- angle between these discs 4, 5.
  • a first or rear main face 38 of the transverse element 32 facing in the circumference direction L of the drive belt 3 is essentially flat, while a so-called rocking or tilting edge 18 is provided on an opposite facing, second or front main face 39 of the transverse element 32.
  • the transverse element 32 in side view has an essentially constant thickness and, in height direction H, whereas below the rocking edge 18, said body part 34 tapers towards the bottom side of the transverse element 32.
  • the rocking edge 18 is typically provided in the form of a slightly rounded section of the front main face 39 of the transverse element 32.
  • the front main face 39 of the transverse element 32 arrives in contact with the rear main face 38 of an adjacent transverse element 32 at the location of the rocking edge 18, both in the straight parts of the drive belt 3 stretching between the pulleys 1, 2 and in the curved parts thereof located between the conical pulley discs 4, 5 of the transmission pulleys 1, 2.
  • the transverse element 32 is also provided with a protuberance 40 on its front main face 39 and a hole 41 in its rear main face 38.
  • the protuberance 40 and the hole 41 of two adjacent transverse elements 32 in the drive belt 3 are mutually engaging in the sense that the protuberance 40 of a first of the adjacent transverse elements 32 is at least partly inserted in the hole 41 of a second one thereof.
  • a relative displacement between and/or rotation of the said two adjacent transverse elements 32 is limited to a clearance provided between the said protuberance 40 and hole 41.
  • a radius Rs of such curvature is typically adapted to, i.e. is chosen equal to or smaller than the smallest running radius R of the drive belt 3 at the pulleys 1, 2.
  • the transverse elements 32 are cut from strip-shaped basic material by a cutter that moves through the material in the above-defined circumference direction L of the drive belt 3.
  • This cutting process does, in principle, not allow for the surfaces that are created therein, such as the bearing surfaces 42, to be provided with a contour in the cutter movement direction, such as the said convex curvature in the circumference direction L of the drive belt 3.
  • the bearing surfaces 42 are thus initially created without the said convex curvature, as illustrated on the left side and middle of figure 4 in a side view of the transverse element 32 and of an enlargement of a part thereof.
  • the convex curvature of the bearing surfaces 42 of the end-product transverse elements 32 which is illustrated on the right side of figure 4, thus needs to be shaped by and in a further process step in the overall manufacturing process of the end-product transverse element 32.
  • Such further process step are provided by the art that mostly concern grinding down, in particular, the edges of the bearing surfaces 42.
  • the above known process step of shaping the bearing surfaces 42 of the transverse elements 32 can be favourably omitted from the overall manufacturing process thereof.
  • a coating 50 with abrasive properties is applied to the radial inside surface 51 of the radially innermost band 44i of the band sets 31. In figure 5 such feature is schematically illustrated in a perspective view of the said innermost band 44i.
  • the saddle surfaces 42 of the transverse elements 42 are ground into a convexly curved shape.
  • the abrasive coating 50 is provided in a strip-shape that does traverse the full width of the radial inside surface 51, but traverses only a (small) part of the circumference length thereof. This latter embodiment of the innermost band 44i is illustrated in figure 6.
  • such strip-shape By the width of such strip-shape, a rate of abrasion of the saddles surfaces 42 can be predetermined. Furthermore, such strip- shape allows a harder and/or more wear-resistant material to be used as the said coating, without the rate of wear of the bearing surfaces 42 caused thereby becoming excessive.
  • the abrasive coating 50 may be applied only in a width-wise central part of the innermost band 44i, as is illustrated in figure 7 in one possible embodiment 50a thereof.
  • the abrasive coating 50 may be provided in shape that narrows from such width-wise central part of the innermost band 44i to the axial sides thereof, as is illustrated in figure 7 in two possible embodiments 50b and 50c thereof.
  • the abrasive coating 50 may be provided in shape that widens from such width-wise central part of the innermost band 44i to the axial sides thereof, as is illustrated in figure 7 in one possible embodiment 50d thereof.
  • the abrasive coating 50 may be provided on one axial side of the innermost band 44i only, as is illustrated in figure 7 in one possible embodiment 50e thereof.
  • the abrasive coating 50 may still extend the entire width of the innermost band 44i, while being tapered in the width direction, e.g. while being provided with a trapezoidal shape, as is illustrated in figure 7 in one possible embodi ⁇ ment 50f thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

L'invention concerne une bande métallique sans fin (44) pour une courroie d'entraînement (3) comprenant au moins un ensemble (31) d'un certain nombre de ces bandes métalliques sans fin (44) qui sont mutuellement imbriquées et comprenant un certain nombre d'éléments transversaux (32) qui sont montés sur l'ensemble de bande (31) et sont pourvus d'une découpe (33) qui s'étend entre une face principale avant (39) et une face principale arrière (38) de l'élément transversal (32) pour enrouler l'ensemble de bandes (31), ladite découpe (33) étant lié dans une direction radiale vers l'intérieur par une surface support (42) orientée vers l'extérieur dans le sens radial des éléments transversaux (32) qui entre en contact de frottement coulissant avec une surface intérieure radiale (51) de la bande métallique sans fin (44i) radialement le plus à l'intérieur de l'ensemble de bandes (31). Selon l'invention, la surface intérieure radiale (51) de la bande métallique sans fin (44) est, au moins en partie, pourvue d'un revêtement abrasif (50).
PCT/EP2015/025113 2014-12-23 2015-12-23 Bande métallique sans fin avec une surface revêtue, courroie d'entraînement pourvue de la bande métallique sans fin et procédé de façonnage de la courroie d'entraînement WO2016102072A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2017534231A JP7014603B2 (ja) 2014-12-23 2015-12-23 コーティング面を備えた無端金属バンド、該無端金属バンドを備えたドライブベルト、ならびに該ドライブベルトを形成する方法
CN201580070846.5A CN107110295B (zh) 2014-12-23 2015-12-23 具有带覆层的表面的环形金属带、设有该环形金属带的传动带以及用于成形该传动带的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1041120 2014-12-23
NL1041120A NL1041120B1 (en) 2014-12-23 2014-12-23 An endless metal band with a coated surface, a drive belt provided with the endless metal band and method for shaping the drive belt.

Publications (1)

Publication Number Publication Date
WO2016102072A1 true WO2016102072A1 (fr) 2016-06-30

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PCT/EP2015/025113 WO2016102072A1 (fr) 2014-12-23 2015-12-23 Bande métallique sans fin avec une surface revêtue, courroie d'entraînement pourvue de la bande métallique sans fin et procédé de façonnage de la courroie d'entraînement

Country Status (4)

Country Link
JP (1) JP7014603B2 (fr)
CN (1) CN107110295B (fr)
NL (1) NL1041120B1 (fr)
WO (1) WO2016102072A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021115630A1 (fr) * 2019-12-10 2021-06-17 Robert Bosch Gmbh Anneau flexible pour courroie d'entraînement et courroie d'entraînement pour une transmission à variation continue comprenant un anneau flexible
WO2021129949A1 (fr) * 2019-12-24 2021-07-01 Robert Bosch Gmbh Anneau souple pour courroie d'entraînement, courroie d'entraînement pour transmission à variation continue comprenant un anneau souple et procédé de fabrication d'un anneau souple

Families Citing this family (2)

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JP6962186B2 (ja) * 2017-12-28 2021-11-05 トヨタ自動車株式会社 車両用伝動ベルトのベルトエレメント
JP7247513B2 (ja) * 2018-10-15 2023-03-29 京セラドキュメントソリューションズ株式会社 駆動伝達装置、画像形成装置

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EP0014013A1 (fr) 1979-01-19 1980-08-06 Van Doorne's Transmissie B.V. Courroie de transmission composite avec éléments transversaux munis de moyens de couplage mutuels
US4281483A (en) 1978-01-31 1981-08-04 Volvo Car B.V. Method of curving supporting surfaces of driving belt elements
JPS61152362A (ja) 1984-12-25 1986-07-11 Fuji Heavy Ind Ltd 無段変速機用ベルトのｖブロック連続加工方法、及びｖブロック連続加工装置
EP0231985A2 (fr) 1983-11-11 1987-08-12 Van Doorne's Transmissie B.V. Méthode et dispositif pour usiner un élément transversal pour une courroie de transmission
EP1366855A1 (fr) 2002-05-30 2003-12-03 JATCO Ltd Procédé et dispositif pour chanfreiner des plaques
EP1369617A2 (fr) * 2002-06-03 2003-12-10 JATCO Ltd Procédé de correction d'un élément d'une courroie de transmission continûment variable
JP2014145423A (ja) 2013-01-29 2014-08-14 Daihatsu Motor Co Ltd 無段変速機のベルト構成用エレメントの研磨方法

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JP3935060B2 (ja) * 2002-11-28 2007-06-20 本田技研工業株式会社 無段変速機用金属ベルト
JP4398160B2 (ja) * 2003-02-10 2010-01-13 本田技研工業株式会社 無端状金属ベルト用金属リングの加工方法及び加工装置
EP1508611B1 (fr) * 2003-08-22 2019-04-17 Nissan Motor Co., Ltd. Boîte de vitesse comprenant une composition d`huile de transmission
NL1030811C1 (nl) * 2005-12-30 2007-07-03 Bosch Gmbh Robert Drijfriem en dwarselement voor een drijfriem.
JP2007181884A (ja) * 2005-12-31 2007-07-19 Yano Kazuya 研磨布紙及びその製造法
EP2516889A1 (fr) * 2009-12-23 2012-10-31 Robert Bosch GmbH Courroie d'entraînement et élément transversal d'une courroie d'entraînement
JP2011149518A (ja) 2010-01-22 2011-08-04 Toyota Motor Corp 伝動ベルトの製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281483A (en) 1978-01-31 1981-08-04 Volvo Car B.V. Method of curving supporting surfaces of driving belt elements
EP0014013A1 (fr) 1979-01-19 1980-08-06 Van Doorne's Transmissie B.V. Courroie de transmission composite avec éléments transversaux munis de moyens de couplage mutuels
EP0014013B1 (fr) 1979-01-19 1983-01-12 Van Doorne's Transmissie B.V. Courroie de transmission composite avec éléments transversaux munis de moyens de couplage mutuels
EP0231985A2 (fr) 1983-11-11 1987-08-12 Van Doorne's Transmissie B.V. Méthode et dispositif pour usiner un élément transversal pour une courroie de transmission
JPS61152362A (ja) 1984-12-25 1986-07-11 Fuji Heavy Ind Ltd 無段変速機用ベルトのｖブロック連続加工方法、及びｖブロック連続加工装置
EP1366855A1 (fr) 2002-05-30 2003-12-03 JATCO Ltd Procédé et dispositif pour chanfreiner des plaques
EP1369617A2 (fr) * 2002-06-03 2003-12-10 JATCO Ltd Procédé de correction d'un élément d'une courroie de transmission continûment variable
JP2014145423A (ja) 2013-01-29 2014-08-14 Daihatsu Motor Co Ltd 無段変速機のベルト構成用エレメントの研磨方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021115630A1 (fr) * 2019-12-10 2021-06-17 Robert Bosch Gmbh Anneau flexible pour courroie d'entraînement et courroie d'entraînement pour une transmission à variation continue comprenant un anneau flexible
NL1043500B1 (en) * 2019-12-10 2021-08-31 Bosch Gmbh Robert A flexible ring for a drive belt and a drive belt for a continuously variable transmission including a flexible ring
WO2021129949A1 (fr) * 2019-12-24 2021-07-01 Robert Bosch Gmbh Anneau souple pour courroie d'entraînement, courroie d'entraînement pour transmission à variation continue comprenant un anneau souple et procédé de fabrication d'un anneau souple
NL1043520B1 (en) * 2019-12-24 2021-09-02 Bosch Gmbh Robert A flexible ring for a drive belt, a drive belt for a continuously variable transmission including a flexible ring and a method for manufacturing a flexible ring

Also Published As

Publication number Publication date
CN107110295B (zh) 2020-11-20
JP7014603B2 (ja) 2022-02-01
NL1041120B1 (en) 2016-10-11
JP2018501448A (ja) 2018-01-18
CN107110295A (zh) 2017-08-29

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