WO2013098653A1 - Courroie de transmission pour une transmission à variation continue comprenant deux types d'éléments transversaux ayant une largeur différente de l'un à l'autre - Google Patents

Courroie de transmission pour une transmission à variation continue comprenant deux types d'éléments transversaux ayant une largeur différente de l'un à l'autre Download PDF

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Publication number
WO2013098653A1
WO2013098653A1 PCT/IB2012/003103 IB2012003103W WO2013098653A1 WO 2013098653 A1 WO2013098653 A1 WO 2013098653A1 IB 2012003103 W IB2012003103 W IB 2012003103W WO 2013098653 A1 WO2013098653 A1 WO 2013098653A1
Authority
WO
WIPO (PCT)
Prior art keywords
transverse members
type
drive belt
whereof
transverse
Prior art date
Application number
PCT/IB2012/003103
Other languages
English (en)
Inventor
Francis Maria Antonius Van Der Sluis
Joost Johannes Cornelis Jonkers
Dirk Johannes DE KUYPER
Arie VAN DER VELDE
Elena Loredana Deladi
Irinel Cosmin Faraon
Ingmarus Geert Hupkes
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 IN4880CHN2014 priority Critical patent/IN2014CN04880A/en
Priority to JP2014549560A priority patent/JP6257524B2/ja
Priority to CN201280065459.9A priority patent/CN104024687B/zh
Publication of WO2013098653A1 publication Critical patent/WO2013098653A1/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 present invention relates to a drive belt for a continuously variable transmission, which is in particular destined to be arranged around two pulleys of the transmission and which comprises a plurality of discrete transverse elements or members for contacting the transmission pulleys, as well as one or more endless carriers for carrying the transverse members for supporting and guiding the transverse members in between the pulleys.
  • the present type of drive belt is also known as a push belt.
  • Each endless carrier of the drive belt is typically composed of a plurality of mutually nested, continuous flexible metal bands and is also known as a ring set. Each endless carrier is at least partly inserted in a recess provided in the transverse members.
  • the drive belt comprises only one endless carrier, such carrier is typically mounted in a central recess of the transverse members that opens towards the radial outside of the drive belt.
  • the drive belt is provided with at least two endless carriers that are each mounted in a respective one of two recesses of the transverse members, which recesses then open towards a respective lateral or axial side of the transverse members, i.e. of the drive belt.
  • the transverse members of the drive belt are slidingly arranged along the circumference of the endless carrier or carriers in a virtually continuous row, such that these members are able to transmit forces which are related to a movement of the drive belt.
  • the transverse members have two main body surfaces which, at least partly, extend substantially parallel with respect to each other and which are separated from each other over the (local) thickness of the transverse member.
  • the transverse members are relatively thin, such that a several hundreds thereof are present in the drive belt, allowing the belt to curve along its circumference by the mutual relative rotation of subsequent transverse members.
  • the transverse members are intended for frictionally contacting the transmission pulleys by being clamped widthwise between two conical sheaves of such pulleys.
  • the transverse members arrive in such friction contact through predominantly axially, i.e. widthwise, oriented side faces thereof, which side faces are corrugated to accommodate transmission oil that is applied in the transmission to lubricate the friction contact.
  • a non- corrugated, i.e. smooth surface can be formed in manufacturing more easily, and typically also more cost effectively, as compared to a corrugated surface.
  • the narrower transverse members are also lower, i.e. have a smaller radial dimension, than the wider transverse members.
  • the narrower transverse members extend to a lesser extent radial inward from the said recess thereof as compared to the wider transverse members. In this way, favorably less material is used in manufacturing and favorably less weight is incorporated in the drive belt.
  • the wider transverse members are provided with a predominantly constant thickness along, essentially, the entire radial dimension thereof.
  • Such transverse members of constant thickness can be formed relatively easily and cost effectively in manufacturing.
  • conventional transverse members include a tapered bottom part, typically thinning from below the recess thereof and extending in radially inward direction.
  • the thus created transition between an upper part of the transverse member of, at least comparatively, constant thickness and the tapered bottom part thereof is normally shaped as a convexly curved part of a main body surface of such transverse member and is often referred to as the tilting edge thereof.
  • the tilting edge allows the adjacent transverse members in the drive belt to tilt relative to one another, such that the drive belt can follow a curved trajectory, while still remaining in a firm and well-defined mutual contact that is, moreover, located close the endless carrier in the radial direction to minimize efficiency loss due to the friction between the endless carrier and the transverse members.
  • the wider transverse members being in rolling contact with a bottom edge of the narrower transverse members between the main body surfaces and a radially inwardly facing bottom surface thereof.
  • the said bottom edges of the narrower transverse members are preferably, smoothly convexly rounded for example according to a radius of curvature of 6 mm or more.
  • the wider transverse members are provided with a predominantly constant thickness along, essentially, the entire radial dimension thereof.
  • the narrower transverse members are provided with a tilting edge on either side thereof, i.e. on both main body surfaces thereof, for enabling the said relative tilting.
  • the design and manufacturing of the wider transverse members can be favorably focused on and optimized for the friction contact with the transmission pulleys, whereas the design and manufacturing of the narrower transverse members can be favorably focused on and optimized for the tilting contact with the wider transverse members in the drive belt.
  • the narrower and the wider transverse members are made, at least in part, from mutually different materials.
  • the material can be favorably optimized between the transverse members, for example in relation to the respective functions thereof or in terms of cost.
  • the wider transverse members are made, at least in part, from a more wear resistant material as compared to the narrower transverse members, for example by including therein a nitrided surface layer or by having a coating of wear resistant material.
  • the wider transverse members are made from a material providing a higher coefficient of friction as compared to the narrower transverse members, for example by the latter, i.e. more narrow transverse members having a low friction coating.
  • the narrower transverse members are made from a material providing a higher coefficient of thermal expansion as compared to the wider transverse members to compensate for wear and/or plastic deformation during operation of the drive belt.
  • the narrower transverse members are made from a lighter material compared to the wider transverse members. Since the narrower members are not clamped widthwise between the sheaves, these transverse members are loaded to a lesser extent than the wider transverse members. As a result, a weaker material that is typically also lighter may be used for the narrower transverse member as compared to that used for the wider transverse member.
  • the narrower transverse members are either thicker or thinner than the wider transverse members.
  • the number and distribution of the wider, i.e. pulley sheave contacting, and the narrower, i.e. non pulley sheave contacting, transverse members can be optimized.
  • the narrower transverse members of the drive belt are thinner than the wider transverse members thereof, the most robust drive belt design can be realized.
  • narrower transverse members of varying thickness in the drive belt the noise that is being produced during operation of the drive can be favorably reduced.
  • Figure 1 provides a schematic perspective view of the 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, which includes two sets of a number of flexible rings, as well as a plurality of transverse members.
  • Figure 3 provides a schematic top-view of a section of a particular design of the drive belt.
  • Figure 4 provides a schematic front view of a first embodiment of the drive belt according to the invention.
  • Figure 5 provides a schematic front view of a second embodiment of the drive belt according to the invention.
  • Figure 6 provides a schematic side view of the second embodiment of the drive belt according to the invention.
  • Figure 7 provides a schematic side view of a third embodiment of the drive belt according to the invention.
  • Figure 8 provides a schematic side view of a fourth embodiment of the drive belt according to the invention.
  • Figure 9 provides a schematic side view of a fifth embodiment of the drive belt according to the invention.
  • FIG. 1 The schematic illustration of a continuously variable transmission (CVT) in Figure 1 shows a drive belt 3 which is wrapped around two pulleys 1 and 2 and which includes two separate endless carriers 31, as well as a plurality of transverse members 30 that are mounted on and arranged along the circumference of these carriers 31 in an essentially contiguous row.
  • the drive belt 3 When it is clamped between the two conical pulley sheaves 4, 5 of the pulleys 1, 2, the drive belt 3 is able to transmit a torque "T" and an accompanying rotational movement " ⁇ " between these pulleys 1, 2 to the other 2, 1.
  • the running radii R of the drive belt 3 between the sheaves 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.
  • the drive belt 3 is shown in more detail in a top-view thereof in figure 2 along a section of three transverse members 30 thereof.
  • the endless carriers 31 are each made up of a set of mutually nested, flat and flexible rings 32.
  • the transverse members 30 of the drive belt 3 are arranged in mutual succession along the circumference of the carriers 31, in such manner that they can slide relative to and in the circumference direction of the carriers 31.
  • the transverse members 30 take-up a clamping force exerted between the sheaves 4, 5 of each pulley 1, 2 via pulley contact faces 33 that are provided on either axial side thereof.
  • pulley contact faces 33 are mutually diverging in radial outward direction to essentially match a V-angle defined between the two sheaves 4, 5 of each pulley 1, 2.
  • a so-called tilting edge 34 represents the transition between a radially outer part of the transverse member 30 of constant thickness and a tapered radial inner part thereof. This shape and tilting edge 34 of the transverse members 30 is what allows the drive belt 3 to follow a smoothly curved trajectory.
  • width W is used in relation to the transverse member 30 and indicates the largest axial distance between the pulley contact faces 33 thereof.
  • all transverse members 30 thereof are provided with essentially the same width W dimension.
  • width W is controlled according to a very narrow tolerance between the said transverse members 30 of the drive belt 3 to equalize the mechanical load exerted on the transverse members 30 during operation.
  • the drive belt 3 may include both wider transverse members 30-1 that have a width W
  • the axial sides of the relatively narrow transverse members 30-11 are referred to merely as side faces 35.
  • the drive belt design of figure 3 opens up several possibilities for further optimization, in particular in terms of the reducing the manufacturing cost of the drive belt 3 as whole.
  • FIG 4 A first possible embodiment of the drive belt 3 according to the invention is illustrated in figure 4.
  • a front view is provided of the left half of a relatively narrow transverse member 30-11 as it is placed in front of a relatively wide transverse member 30-1.
  • this first embodiment only the axial side face 33, i.e. the said pulley contact faces 33 of the wider transverse member 30-1 is provided with a corrugation 36.
  • the corresponding side face 35 of the narrower transverse member 30-11 being shaped as an, at least comparatively, smooth surface.
  • FIG 5 A second possible embodiment of the drive belt 3 according to the invention is illustrated in figure 5.
  • a front view is provided of the left half of a relatively narrow transverse member 30-11 as it is placed in front of a relatively wide transverse member 30-1.
  • the narrower transverse member 30-11 are lower in the vertical direction of figure 5, i.e. have a smaller radial dimension, than the wider transverse members 30-1 such that it extends to a lesser extent in radially inward direction from the carrier 31, i.e. from the carrier receiving recess 37 of such narrower transverse member 30-11, as compared to such radial extent of the wider transverse member 30-1.
  • This second possible embodiment is further illustrated in figure 6 in a side view of row of five such transverse members 30, 30-1, 30-11.
  • FIG 7 A third possible embodiment of the drive belt 3 according to the invention is illustrated in figure 7.
  • a side view is provided of row of five transverse members 30, 30-1, 30-11.
  • the wider transverse members 30-1 are additionally provided with a predominantly constant thickness along the entire radial extent thereof.
  • the wider transverse members 30-1 do not include the above-mentioned tilting edge 34, in stead the narrower transverse members 30-11 each include two tilting edges 34, one provided on either main body surface thereof.
  • FIG 8 A fourth possible embodiment of the drive belt 3 according to the invention is illustrated in figure 8.
  • a side view is provided of row of five transverse members 30, 30-1, 30-11.
  • both the wider transverse members 30-1 and the narrower transverse members 30-11 are additionally provided with a predominantly constant thickness along the entire radial extent thereof.
  • the bottom edges 38 of the narrower transverse members 30-11 allow a rolling contact between the adjacent transverse members 30 in the drive belt 3.
  • FIG 9 A fifth possible embodiment of the drive belt 3 according to the invention is illustrated in figure 9.
  • a side view is provided of row of five transverse members 30-1, 30-11.
  • both thicker and thinner variants of the transverse members 30-11 are provided in the drive belt 3.

Abstract

L'invention concerne une courroie de transmission (3) comprenant un ruban porteur (31) sans fin et une pluralité d'éléments transversaux (30) qui sont montés sur le ruban porteur (31) et disposés le long de sa circonférence en une rangée où ils sont pour l'essentiel contigus. Ce type de courroie de transmission (3) est bien connu, en particulier par son application dans les transmissions par courroie et poulies du type à friction. Selon l'invention, l'efficacité d'une telle transmission est améliorée quand ce ne sont pas tous les éléments transversaux (30) de la courroie de transmission (3) qui participent au contact de friction avec les poulies de transmission (1, 2). On réalise cet effet technique, conformément à l'invention, en dotant la courroie de transmission (3) de deux types d'éléments transversaux (30), parmi lesquels le second type est moins large que le premier type.
PCT/IB2012/003103 2011-12-30 2012-12-27 Courroie de transmission pour une transmission à variation continue comprenant deux types d'éléments transversaux ayant une largeur différente de l'un à l'autre WO2013098653A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IN4880CHN2014 IN2014CN04880A (fr) 2011-12-30 2012-12-27
JP2014549560A JP6257524B2 (ja) 2011-12-30 2012-12-27 互いに異なる幅を有する２つのタイプの横方向部材を備えた、無段変速機に用いられる駆動ベルト
CN201280065459.9A CN104024687B (zh) 2011-12-30 2012-12-27 用于无级变速器的包括宽度彼此不同的两种类型横向部件的传动带

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1039276A NL1039276C2 (en) 2011-12-30 2011-12-30 Drive belt for a continuously variable transmission comprising two types of transverse members having a mutually different width.
NL1039276 2011-12-30

Publications (1)

Publication Number Publication Date
WO2013098653A1 true WO2013098653A1 (fr) 2013-07-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/003103 WO2013098653A1 (fr) 2011-12-30 2012-12-27 Courroie de transmission pour une transmission à variation continue comprenant deux types d'éléments transversaux ayant une largeur différente de l'un à l'autre

Country Status (5)

Country Link
JP (1) JP6257524B2 (fr)
CN (1) CN104024687B (fr)
IN (1) IN2014CN04880A (fr)
NL (1) NL1039276C2 (fr)
WO (1) WO2013098653A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3187750A1 (fr) * 2015-12-30 2017-07-05 Robert Bosch GmbH Courroie d'entraînement pour une transmission variable continue comprenant deux types d'éléments transversaux de largeurs différentes
WO2018114054A1 (fr) * 2016-12-22 2018-06-28 Robert Bosch Gmbh Courroie de transmission comprenant différents types de segments transversaux pour une transmission à variation continue
CN109654165A (zh) * 2017-10-10 2019-04-19 丰田自动车株式会社 传动带

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1041121B1 (en) * 2014-12-23 2016-10-11 Bosch Gmbh Robert A pushbelt for a continuously variable transmission and a transmission provided therewith.
NL1041129B1 (en) * 2014-12-30 2016-10-11 Bosch Gmbh Robert Method for assembling a drive belt with different types of transverse members for a continuously variable transmission and a thus assembled drive belt.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61103651U (fr) * 1984-12-12 1986-07-01
EP1455114A2 (fr) * 2003-03-06 2004-09-08 Nissan Motor Co., Ltd. Courroie en V métallique
WO2012089340A1 (fr) * 2010-12-29 2012-07-05 Robert Bosch Gmbh Élément transversal destiné à une courroie de transmission assemblée dotée d'éléments transversaux et d'un anneau de tension et courroie de transmission assemblée

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JPS56120848A (en) * 1980-02-25 1981-09-22 Nippon Denso Co Ltd Transmission belt
JPS6174933A (ja) * 1984-09-20 1986-04-17 Toyota Motor Corp 伝導ベルト
JP3780237B2 (ja) * 2002-08-19 2006-05-31 バンドー化学株式会社 高負荷伝動用ｖベルト
NL1033140C2 (nl) * 2006-12-27 2008-06-30 Bosch Gmbh Robert Drijfriem voor een continu variabele transmissie met dwarselementen voorzien van conctactgebieden.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61103651U (fr) * 1984-12-12 1986-07-01
EP1455114A2 (fr) * 2003-03-06 2004-09-08 Nissan Motor Co., Ltd. Courroie en V métallique
WO2012089340A1 (fr) * 2010-12-29 2012-07-05 Robert Bosch Gmbh Élément transversal destiné à une courroie de transmission assemblée dotée d'éléments transversaux et d'un anneau de tension et courroie de transmission assemblée

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3187750A1 (fr) * 2015-12-30 2017-07-05 Robert Bosch GmbH Courroie d'entraînement pour une transmission variable continue comprenant deux types d'éléments transversaux de largeurs différentes
NL1041656B1 (en) * 2015-12-30 2017-07-11 Bosch Gmbh Robert Drive belt for a continuously variable transmission comprising two types of transverse members of mutually different width.
WO2018114054A1 (fr) * 2016-12-22 2018-06-28 Robert Bosch Gmbh Courroie de transmission comprenant différents types de segments transversaux pour une transmission à variation continue
NL1042191B1 (en) * 2016-12-22 2018-06-29 Bosch Gmbh Robert Drive belt comprising different types of transverse segments for a continuously variable transmission
CN109654165A (zh) * 2017-10-10 2019-04-19 丰田自动车株式会社 传动带
CN109654165B (zh) * 2017-10-10 2021-07-20 丰田自动车株式会社 传动带

Also Published As

Publication number Publication date
CN104024687A (zh) 2014-09-03
CN104024687B (zh) 2017-02-22
NL1039276C2 (en) 2013-07-03
JP6257524B2 (ja) 2018-01-10
IN2014CN04880A (fr) 2015-09-18
JP2015503716A (ja) 2015-02-02

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