US20050144899A1 - Drive belt - Google Patents

Drive belt Download PDF

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Publication number
US20050144899A1
US20050144899A1 US11/015,641 US1564104A US2005144899A1 US 20050144899 A1 US20050144899 A1 US 20050144899A1 US 1564104 A US1564104 A US 1564104A US 2005144899 A1 US2005144899 A1 US 2005144899A1
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US
United States
Prior art keywords
saddle
drive belt
radius
surface part
curvature
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.)
Abandoned
Application number
US11/015,641
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English (en)
Inventor
Minh Tran
Pieter Antonius Sebastianus Pennings
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.)
Robert Bosch GmbH
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
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PENNINGS, PIETER ANTONIUS SEBASTIANUS MARIA, TRAN, MINH DUC
Publication of US20050144899A1 publication Critical patent/US20050144899A1/en
Abandoned legal-status Critical Current

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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 transmission realising a continuously variable transmission ratio according to the preamble of claim 1 .
  • Drive belts of the present type are generally known through their application in continuously variable transmissions and typically also from EP-A-1111271 in the name of Applicant.
  • the belts comprise one or two tensile means, typically in the form of a set of nested continuous metal bands.
  • tensile means typically in the form of a set of nested continuous metal bands.
  • Currently applied and tested continuous bands that are intended for belts with two separate tensile means have a transverse width ranging from 8 to 15 millimetres, a radial thickness ranging from of 0.10 to 0.30 millimetres and a longitudinal circumference length ranging from 210 to 700 millimetres. These ranges typify the automotive application of the drive belt.
  • the known drive belt is adopted in the continuously variable transmission, where it runs between the frusto-conical sheaves of a pair of adjustable pulleys, whereby the pulley sheaves exert a clamping force on cross elements of the belt.
  • This clamping force on the one hand, enables torque transmission through friction between the pulley sheaves of the pulleys and the drive belt and, on the other hand, urges the cross elements radially outward with respect to the rotational axle of the pulleys.
  • the actual radially outward movement of the cross elements is limited by the tensile means.
  • the tensile means and the continuous bands thereof are thereby put under tension via a normal force between a radially outwardly oriented contact-face of the cross elements and the innermost continuous band or bands as seen in radial direction of the set or sets of nested continuous bands, i.e. the tensile means.
  • torque transfer by the cross elements pushing each other from one pulley to the other without drive belt buckling is enabled.
  • the transmission ratio of the transmission is determined by the quotient of running radii of the drive belt between the sheaves of the respective pulleys and can be varied from a minimum transmission ratio, wherein the running radius of a drive belt at a drive pulley is maximal and that in a driven pulley is minimal—the so-called Overdrive ratio—, via a medium transmission ratio, wherein both said running radii are virtually equal, to a maximum transmission ratio, wherein the running radius in the drive pulley is minimal and that in the driven pulley is maximal—the so-called Low ratio—and vice versa.
  • the continuous bands of the belt are of metal to reliably cope with the relatively high torque levels that occur in automotive applications of the transmission.
  • the separate cross elements of the drive belt are of metal and are shaped and dimensioned essentially mutually conforming. Because of its nature of use, the known drive belt is during operation subjected to extreme contact, bending en tensile stresses that, for instance, vary in height with the amount of bending in its longitudinal direction, i.e. proportional to the inverse value of the running radius, as well as with the mechanical power transmitted by the transmission. For this reason, avoidance of breakage of a drive belt during the service life of the transmission or the vehicle wherein it is to be applied, e.g. because of fatiguing and/or wear, is a main point of consideration in drive belt design.
  • This transverse curvature of the saddle surface of the cross elements is intended to obtain a tensile means tracking effect through which a desired mutual orientation of the tensile means and the and cross elements is maintained, at least promoted, during operation and the said abrasive contact between a is avoided to a large extend.
  • EP-A-1111271 also a so-called anticlastic bending effect is taken into account. More in particular, it was recognised that a transverse curvature of the continuous band varies with an amount of bending in the longitudinal direction thereof, i.e. with the running radius thereof. According to this document the convex curvature of the saddle surface should be larger, i.e. its radius of curvature smaller, than that of the innermost continuous band at least where it is bent in the longitudinal direction at the said minimal running radius. Again it is aimed to lower the contact stresses between the cross elements and the innermost band, while maintaining the tracking effect.
  • an object of the current invention to provide for an improvement in the load carrying capacity of the drive belt by lowering the total stress loading thereof, i.e. including not only the said contact stresses, but also bending stresses due to the longitudinal and the transverse bending thereof.
  • such aim may be achieved by a drive belt according to the characterising portion of claim 1 .
  • a preferred contact between the innermost band of the tensile means and the saddle surface of the cross elements is realised, wherein the total stress loading of in particular the innermost band is minimised.
  • the measures of the radius of curvature of the saddle surface being essentially constant throughout its axial or transverse width and at least the first transition surface part forming a relatively sharp edge between the saddle surface and the concavely recessed part adjacent the pillar part, the axial width of the saddle surface is maximised and a separation in the radial direction between the saddle surface and the innermost band is minimised.
  • the present invention relies, inter alia, on a detailed stress analysis of the contact between the cross elements and the innermost band of the tensile means. This analysis showed that when during operation tensile stress is applied to the tensile means in a longitudinally bent section thereof, the innermost band thereof is forced into contact with the saddle surface, whereby it at least partly assumes the shape of the saddle surface in the transverse direction. When the saddle radius is smaller than the radius of the innermost band when it is not subjected to the tensile stress, i.e.
  • the plane of contact between the innermost band and the saddle surface extends in the lateral direction from a central or mid position towards either lateral side thereof, whereby the contact pressure decreases from such mid position towards the lateral sides along the plane of contact.
  • an amount of transverse bending of the innermost band before it engages the saddle surface is determined by a local separation in the radial direction there between.
  • the stress analysis underlying the present invention showed that minimising such radial separation significantly reduces the stress loading of the innermost band due to the reduced amount of transverse bending thereof and, more importantly, that this effect more than offsets any negative, i.e. stress raising, effect of the relatively sharp edge formed by the said first transition surface part.
  • the stresses associated with a contact between a transition surface part of the cross element adjacent to the saddle surface and a lateral side of the innermost band remain relatively small, due to the local contact pressure also being relatively small, if such contact would occur at all within the current design given the design requirements claimed. After all, the latter includes that the band radius should be larger than saddle radius.
  • the tensile means of the known drive belt is usually provided with bands that are wider than the transverse width of the saddle surface, such that the lateral sides of the innermost band may in principle engage a transitional part of the cross element on either side of the saddle surface. Therefore, in an embodiment of the invention, the contact stress in the innermost band at the location of the first transition surface part may be limited by the further measure that a transverse width of the innermost band is less than 125% of the transverse width of the saddle surface, preferably less than 115%.
  • the distance that the innermost band extends over such first transition surface part is limited.
  • Such distance may be further limited by positioning a highest point on the saddle surface as seen in radial direction eccentric with respect transverse width of the saddle surface away from the said first transition surface part. This highest point works as the tracking centre for the above-mentioned tracking effect of the tensile means, thus urging the tensile means away from the first transition surface part of the cross element during operation.
  • a radius of curvature of the first transition surface part is as small as possible such that the saddle surface may be as wide as possible.
  • the smallest possible radius of curvature is normally determined by the particular manufacturing process of the cross elements. In case of the generally preferred process of blanking such minimum radius of curvature amounts to approximately 3 mm.
  • a second transition surface part between the saddle surface and a predominantly transversely oriented side face of the cross element is preferably formed as a relatively sharp edge in accordance with the invention.
  • FIG. 1 is a schematic representation of the transmission and the drive belt the present invention relates to
  • FIG. 2 is a schematic representation of a cross section of a conventional drive belt
  • FIG. 3 shows an enlarged part of the cross section of FIG. 2 , whereby the right-hand side of the figure shows a graph wherein the modelled bending stresses for the innermost band are shown,
  • FIG. 4 represents a drive belt design according to the invention, together with the effect thereof in a graph wherein the modelled bending stresses for the innermost band are shown,
  • FIG. 5 is a representation of the drive belt similar to FIG. 4 representing a non-desired condition for the innermost band, and wherein
  • FIG. 6 illustrates a further drive belt design according to the invention, together with the effect thereof in a graph wherein the modelled bending stresses for the innermost band are shown.
  • FIG. 1 represents a schematic cross section of a continuously variable transmission, or CVT, with a drive belt 1 that comprises a tensile means 20 composed of a number of radially nested relatively thin continuous bands 21 , such that it may be bent relatively easily in its longitudinal direction, and a number of cross elements 30 each having a contact face 31 for contacting the radially innermost band 21 of the tensile means 20 , which contact face 31 is denoted the saddle surface 31 hereafter.
  • the drive belt 1 is located around and between a set of pulleys 4 , 5 , each having a rotational axle 6 , 7 respectively.
  • the drive belt 1 is clamped between two sheaves of each of the pulleys 4 , 5 by axially moving the sheaves towards each other, thereby exerting a clamping force on the drive belt 1 .
  • the cross elements 30 of the drive belt 1 are provided with predominantly transversely oriented side faces 32 that are mutually oriented at an angle, as shown in an cross-sectional view of the belt 1 represented by FIG. 2 . With this configuration, the cross elements 30 are urged radially outwards by the clamping force, thereby exerting a normal force on the tensile means 20 that is put under a tensile stress as a consequence.
  • the cross elements 30 are thrust along the tensile means 20 towards the respective second pulley 5 , thereby providing a driving force to the latter.
  • a so-called running radius of the drive belt 1 at each pulley 4 , 5 is continuously variable, so that a continuously variable torque and speed transmission ratio may be achieved between the said pulleys 4 , 5 .
  • the drive belt 1 is provided with two separate tensile means 20 , each located on one respective side of a central part of the cross element 30 denoted the pillar part 33 .
  • Section “D” of FIG. 2 is indicated in more detail in FIG. 3 that shows an enlargement thereof.
  • the saddle surface 31 is provided with a convex curvature in a direction transverse to the longitudinal direction of the drive belt 1 to effect tracking of the tensile means 20 , i.e. to maintain or at least promote a desired mutual orientation thereof with respect to the saddle surface 31 .
  • the continuous band 21 during operation is centred on the contact face 31 and an abrasive contact between transversely oriented lateral sides of the bands 21 and the pulleys 4 , 5 and the pillar part 33 of the cross elements 30 is prevented to a significant extend.
  • the said transverse curvature of the saddle surface 31 is composed of three predominantly arc-shaped sections, being a central section of saddle radius Rs and two lateral side sections of somewhat smaller radius Rs′ provided on either side of the central section, thus providing a more or less elliptical shape of the saddle surface 31 overall as seen in a longitudinally oriented cross section. It is, however, also known in the art to form the saddle surface 31 by a single generally arc-shaped transverse curvature that is defined by a constant radius Rs.
  • a first transition surface part 35 is located at the side of the saddle surface 31 closest to the pillar part 33 and forms a convex transition between the saddle surface 31 and a concavely recessed surface part 34 .
  • a second transition surface part 36 is located at the side of the saddle surface 31 closest to the respective transversely oriented side face 32 of the cross element 30 and forms a convex transition there between.
  • both these transition surface parts 35 , 36 are defined by a relatively large radius of curvature Rc 0 of, typically, 7 mm, so as to reduce and limit any adverse so-called Hertzian contact stress with the innermost band 21 of the tensile means 20 between these surface parts 35 , 36 .
  • a stress graph is provided, wherein for such known cross element design these two bending stresses ⁇ L, ⁇ T have been calculated for a particular drive belt load configuration along the transverse width W of the innermost band 21 and starting from the lateral side thereof closest to the pillar part 33 towards the lateral side thereof closest to the said respective side face 32 .
  • This stress graph indeed indicates that the transverse bending stress ⁇ T significantly increases near the lateral sides of the band 21 and, in this example, reaches a maximum of about ⁇ 210 N/mm 2 .
  • the negative sign of this stress indicates it to be a compressive stress.
  • the longitudinal bending stress ⁇ L is distributed rather more evenly along the transverse width W of the band 21 and has a centrally located maximum of about 290 N/mm 2 . It should be noted that this stress graph is to be treated as an example only and, therefore, that the numeric values disclosed thereby are primarily intended for comparison with those calculated for the cross element design in accordance with the invention.
  • FIG. 4 a cross element design in accordance with the invention is shown, wherein both the first and the second transition surface parts 35 , 36 are formed as a relatively sharp edge, in casu being arc-shaped with a respective radius of curvature Rc 1 , Rc 2 of 3 mm and where between the saddle surface 31 extends in transverse direction forming an arc-shaped convex curvature provided with an essentially constant radius of curvature Rs of about 300 mm.
  • a stress graph is provided wherein for such cross element design in accordance with the invention the two above-mentioned bending stresses ⁇ L, ⁇ T have been calculated for the same drive belt load configuration as formed the basis for FIG. 3 .
  • This stress graph indicates that that with the measures according to the invention the transverse bending stress ⁇ T may be lowered significantly, i.e. from the above-mentioned ⁇ 210 N/mm 2 to about ⁇ 60 N/mm 2 .
  • the calculations further indicate that also the longitudinal bending stress ⁇ L may lowered somewhat, i.e. from the above-mentioned 290 N/mm 2 to about 250 N/mm 2 .
  • FIG. 5 depicts an adverse condition of drive belt operation that is to be avoided in the present belt 1 , preferably at all times, in which condition the band 21 , at least when bent in the longitudinal direction between the sheaves of a pulley 4 , 5 and in an unloaded state, would bear on the saddle surface 31 near its lateral sides as might occur in a known belt 1 , in particular at a relatively large running radius thereof. During operation this condition could otherwise cause significant and undesirable—Herzian—contact stress at or near the said lateral sides. In particular in combination with the relatively sharp edge formed by the first and/or second transition surface part 35 , 36 in accordance with the invention, these contact stresses could even be fatal and cause early breakage of the innermost band 21 .
  • the saddle radius Rs is designed to be smaller than the band radius Rb, irrespective of an amount of bending in the longitudinal direction of the band 21 that may occur during operation in the transmission when it is located between the sheaves of a pulley 4 , 5 .
  • FIG. 6 finally, relates to a further measure according to the invention, in which the centre C 1 of the saddle radius Rs describing the saddle surface is located axially displaced from the midpoint of this surface 31 away form the concavely recessed surface part 34 as seen in the transverse direction.
  • a highest point of the curvature of the saddle surface 31 is located eccentric with respect to the width of the saddle surface 31 away from the pillar part and towards the side face 32 of the cross element 30 .
  • overhang parameter at the respective other side of the saddle surface 31 i.e. a transverse distance that the innermost band 21 extends over the second transition surface part 36 , is effectively limited during operation by a respective pulley sheave onto which the cross element 30 bears through its respective side face 32 .
  • the right-hand side indicates the bending stresses ⁇ L, ⁇ T associated with a such-shaped saddle surface 31 calculated for the same drive belt load configuration as in FIGS. 3 and 4 . It can be derived therefrom that although the longitudinal bending stress ⁇ L has assumed an asymmetric shape, it was possible to decrease the maximum level thereof even further to approximately 230 N/mm 2 . Also the maximum level of the transverse bending stress ⁇ T was reduced even further to approximately ⁇ 35 N/mm 2 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
US11/015,641 2003-12-18 2004-12-20 Drive belt Abandoned US20050144899A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03029098A EP1544502B1 (de) 2003-12-18 2003-12-18 Treibriemen
EP03029098.5 2003-12-19

Publications (1)

Publication Number Publication Date
US20050144899A1 true US20050144899A1 (en) 2005-07-07

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ID=34486235

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/015,641 Abandoned US20050144899A1 (en) 2003-12-18 2004-12-20 Drive belt

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US (1) US20050144899A1 (de)
EP (1) EP1544502B1 (de)
CN (1) CN100451381C (de)
AT (1) ATE519965T1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120231910A1 (en) * 2009-11-19 2012-09-13 Toyota Jidosha Kabushiki Kaisha Transmission belt
US20150337922A1 (en) * 2012-12-28 2015-11-26 Robert Bosch Gmbh Transverse segment for a drive belt with a carrier ring and multiple transverse segments
US11280385B2 (en) * 2016-02-12 2022-03-22 Aisin Corporation Transfer belt

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009082196A1 (en) * 2007-12-24 2009-07-02 Robert Bosch Gmbh Drive belt
DE112009005554B3 (de) 2009-11-19 2023-03-16 Toyota Jidosha Kabushiki Kaisha Übertragungsriemen
NL1038483C2 (en) * 2010-12-29 2012-07-02 Bosch Gmbh Robert A DRIVE BELT FOR A CONTINUOUSLY VARIABLE TRANSMISSION.
NL1039275C2 (en) 2011-12-30 2013-07-03 Bosch Gmbh Robert Method for manufacturing a transverse element which is destined to be part of a drive belt for a continuously variable transmission.
US11454299B2 (en) * 2017-06-02 2022-09-27 Aisin Corporation Transmission belt element and transmission belt

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4526559A (en) * 1981-03-25 1985-07-02 Borg-Warner Corporation Tension-type belt/pulley system for a continuously variable transmission
US4610648A (en) * 1983-10-31 1986-09-09 Dayco Corporation Belt construction for a continuously variable transmission, transverse belt element therefor and methods of making the same
US5152722A (en) * 1990-07-25 1992-10-06 Nissan Motor Co., Ltd. Transmission belt assembly
US6270437B1 (en) * 1998-02-09 2001-08-07 Honda Giken Kogyo Kabushiki Kaisha Belt for continuously variable transmission
US20020025873A1 (en) * 2000-08-11 2002-02-28 Hirofumi Akagi Belt for continuously variable transmission
US6464606B2 (en) * 1999-12-20 2002-10-15 Van Doorne's Transmissie B.V. Drive belt for a continuously variable transmission, continuous band thereof and method of producing such a continuous band
US6676553B2 (en) * 2000-06-21 2004-01-13 Van Doorne's Transmissie B.V. Driving belt and transverse element for a driving belt
US6857980B2 (en) * 2001-06-12 2005-02-22 Van Doorne's Transmissle B.V. Transverse element having a conical neck portion

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL155927B (nl) 1975-10-09 1978-02-15 Doornes Transmissie Bv Metalen drijfriem, alsmede duwelement daarvoor.
NL9300880A (nl) * 1993-05-24 1994-12-16 Doornes Transmissie Bv Drijfriem.
JP3669680B2 (ja) * 2000-01-17 2005-07-13 本田技研工業株式会社 無段変速機用ベルト
JP2002168305A (ja) 2000-11-30 2002-06-14 Mitsubishi Motors Corp 無段変速機用ベルトのエレメント、及び無段変速機用ベルト
EP1221561A1 (de) * 2000-12-28 2002-07-10 Van Doorne's Transmissie B.V. Treibriemen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4526559A (en) * 1981-03-25 1985-07-02 Borg-Warner Corporation Tension-type belt/pulley system for a continuously variable transmission
US4610648A (en) * 1983-10-31 1986-09-09 Dayco Corporation Belt construction for a continuously variable transmission, transverse belt element therefor and methods of making the same
US5152722A (en) * 1990-07-25 1992-10-06 Nissan Motor Co., Ltd. Transmission belt assembly
US6270437B1 (en) * 1998-02-09 2001-08-07 Honda Giken Kogyo Kabushiki Kaisha Belt for continuously variable transmission
US6464606B2 (en) * 1999-12-20 2002-10-15 Van Doorne's Transmissie B.V. Drive belt for a continuously variable transmission, continuous band thereof and method of producing such a continuous band
US6676553B2 (en) * 2000-06-21 2004-01-13 Van Doorne's Transmissie B.V. Driving belt and transverse element for a driving belt
US20020025873A1 (en) * 2000-08-11 2002-02-28 Hirofumi Akagi Belt for continuously variable transmission
US6857980B2 (en) * 2001-06-12 2005-02-22 Van Doorne's Transmissle B.V. Transverse element having a conical neck portion

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120231910A1 (en) * 2009-11-19 2012-09-13 Toyota Jidosha Kabushiki Kaisha Transmission belt
US8870695B2 (en) * 2009-11-19 2014-10-28 Toyota Jidosha Kabushiki Kaisha Transmission belt
US20150337922A1 (en) * 2012-12-28 2015-11-26 Robert Bosch Gmbh Transverse segment for a drive belt with a carrier ring and multiple transverse segments
US9494212B2 (en) * 2012-12-28 2016-11-15 Robert Bosch Gmbh Transverse segment for a drive belt with a carrier ring and multiple transverse segments
US11280385B2 (en) * 2016-02-12 2022-03-22 Aisin Corporation Transfer belt

Also Published As

Publication number Publication date
EP1544502B1 (de) 2011-08-10
CN1699784A (zh) 2005-11-23
ATE519965T1 (de) 2011-08-15
CN100451381C (zh) 2009-01-14
EP1544502A1 (de) 2005-06-22

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AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TRAN, MINH DUC;PENNINGS, PIETER ANTONIUS SEBASTIANUS MARIA;REEL/FRAME:016110/0894;SIGNING DATES FROM 20041126 TO 20041208

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION