WO2011076235A1 - Courroie d'entraînement et élément transversal d'une courroie d'entraînement - Google Patents

Courroie d'entraînement et élément transversal d'une courroie d'entraînement Download PDF

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Publication number
WO2011076235A1
WO2011076235A1 PCT/EP2009/009244 EP2009009244W WO2011076235A1 WO 2011076235 A1 WO2011076235 A1 WO 2011076235A1 EP 2009009244 W EP2009009244 W EP 2009009244W WO 2011076235 A1 WO2011076235 A1 WO 2011076235A1
Authority
WO
WIPO (PCT)
Prior art keywords
transverse element
saddle surface
drive belt
groove
cut
Prior art date
Application number
PCT/EP2009/009244
Other languages
English (en)
Inventor
Guillaume Gerard Hubertus Rompen
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 EP09799284A priority Critical patent/EP2516889A1/fr
Priority to PCT/EP2009/009244 priority patent/WO2011076235A1/fr
Priority to CN200980163501.9A priority patent/CN103339408B/zh
Publication of WO2011076235A1 publication Critical patent/WO2011076235A1/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 forming a V-groove.
  • the drive belt is provided with a carrier consisting of two adjacent band sets, each band set comprising at least one, but usually a number of concentrically nested, relatively thin and flat endless metal bands and with a number of metal transverse elements arranged on and in sliding relationship with the band sets.
  • Each transverse element is provided with two cut-outs located opposite one another for accommodating the band sets, in such a manner that a first part of the transverse element extends below the band sets, a second part of the transverse element is situated between the band sets and a third part of the transverse element extends above the band sets.
  • a drive belt of this type is known from EP-A-0014013.
  • the transverse element is in an upright position, such as is illustrated in figure 2 in a front view thereof.
  • the longitudinal or circumference direction of the drive belt is at right angles to the plane of the figure.
  • the transverse or width direction is from left to right and the radial or height direction is from top to bottom in the plane of figure 2.
  • the surface of the transverse elements has to meet certain requirements in order to ensure a good operation of the drive belt. For example, during operation of the drive belt in the transmission, the transverse elements are pushed radially outwards against the band sets by the transmission pulleys.
  • the (radial inside of the) band set is contacted by a radially outwardly facing surface part of the said first part of the transverse element that forms the bottom of the respective cut-out, which surface part is referred to as the saddle surface.
  • the finishing and shape of the saddle surface have a significant impact on the performance and/or durability of the band set and, hence, on the drive belt as a whole.
  • the saddle surface is designed as a smooth, doubly curved surface, that is to say both width-wise and in the said longitudinal direction.
  • the width-wise curvature of the saddle surface is defined in a cross- sectional plane of the transverse element including the width and height directions, i.e. in a cross-section of the transverse element oriented in the longitudinal direction
  • the longitudinal curvature is defined in a cross- sectional plane of the transverse element including the height and longitudinal directions, i.e. in a cross-section of the transverse element oriented in the width direction.
  • the known saddle surface is provided with surface roughness of about 0.55 ⁇ Ra roughness value at most, typically around 0.4 ⁇ Ra.
  • the known longitudinal curvature of the saddle surface describes, or at least may be approximated by, a circular arc with a radius of curvature that is referred to as the short saddle radius.
  • the short saddle radius is set smaller than the smallest running radius of the drive belt on the pulleys of the transmission, e.g. in the range from 15 to 30 mm.
  • a longitudinal curvature of the band sets largely corresponds to a longitudinal curvature of the drive belt on the pulleys, at least in comparison with a drive belt provided with transverse element having longitudinally straight saddle surfaces.
  • the band sets assume a more or less polygonal shape composed of straight sections alternated by sharply curved sections at the front and rear edge of the saddle surface of each transverse element.
  • sharply curved sections significantly increase the stress level in the band sets during operation and hence decrease the load carrying capacity and/or the service life of the drive belt.
  • the known transverse element is cut or blanked out of a strip-shaped base material by a cutter that moves through the material in the above-defined longitudinal direction of the drive belt.
  • This cutting process does, in principle, not allow for a cut surface, such as the saddle surface, to be curved in the cutter movement direction.
  • the said longitudinal curvature of the saddle surface thus needs to be created in a further step in the manufacturing process, such as by means of grinding, which adds to the overall manufacturing cost of the drive belt.
  • the known curved saddle surface was previously conceived to represent the optimum shape for the saddle surface, according to the invention such shape can still be improved upon-. More in particular, a disadvantage was found to be associated with the known shapes of the saddle surface (whether flat, longitudinally curved and/or curved width-wise) , namely that during operation a significant amount of friction can occur in the sliding contact between the transverse elements and band sets, which causes a loss of efficiency and/or a build up of heat in that sliding contact. This build up of heat can in turn cause excessive wear, and/or a decrease in fatigue strength of the transverse element and/or the band set and as such can limit the power transmitting capacity of the drive belt.
  • the present invention aims to provide a viable alternative to the known, longitudinally straight and curved cross- sectional contours of the saddle surface of the transverse elements.
  • such novel design of the saddle surface provides an improvement in terms of efficiency of the drive belt and/or in terms of its production.
  • the above aim is realized with the transverse element according to the claim 1 hereinafter.
  • the saddle surface of the transverse element according to the invention is provided with at least one groove located between two, higher lying parts of the saddle surface. The said higher lying parts being intended to arrive in contact with the band set, whereas -a bottom surface of- the said groove is not.
  • a long axis of the groove is oriented at least predominantly in the width direction, i.e. perpendicular in the direction of movement of the drive belt.
  • a cooling and/or lubricant agent such as automatic transmission fluid (ATF) or oil, as typically applied in the present type transmission, will accumulate during operation, which is considered to have a positive effect on the sliding contact between the transverse element and the band set.
  • ATF automatic transmission fluid
  • the lubrication of the said sliding contact is believed to be enhanced thereby, for instance in terms of a thicker oil film there between, resulting in a reduced wear rate and/or decreased energy losses through friction.
  • a surface profile of grooves and ridges that is typically provided to at least the radial inside of the band sets, i.e. to the radially inwardly oriented surface of the radially innermost band thereof, as is for example described in US-4,332,575 can potentially be favourably omitted by the provision of several grooves in the saddle surface in accordance with the present invention .
  • the said higher lying parts of the saddle surface on either side of the width-wise oriented groove may be provided with mutually different heights.
  • the transverse element may support the preferred, non-sharply curved, longitudinal curvature of the band set, without its saddle surface -or at least the part or parts thereof that actually arrive in contact with the band set- having to be provided with the known longitudinal curvature.
  • the said central and side parts of the saddle surface may approximate the conventionally applied, convexly curved shape, however, favourably without these saddle surface parts as such having to be provided with a longitudinally curved cross-sectional contour.
  • the upper or radially inwardly facing boundary surface of the cut-out which is defined by the said third part of the transverse element and which also may arrive into contact with (in this case the radial outside of) the band set, is provided with at least one groove in a manner corresponding to and to the same effect as the groove or grooves provided in the saddle surface as described herein in detail.
  • Fig. 1 diagrammatically shows a continuously variable transmission with a drive belt running over two pulleys
  • Fig. 2 shows a cross section of the drive belt viewed in the longitudinal direction thereof
  • Fig. 3 shows a width-wise oriented view of a transverse element of the drive belt
  • Fig. 4 schematically shows a cross-section of the transverse element according to a first embodiment of the invention
  • Fig. 5 schematically shows a cross-section of the transverse element according to a second embodiment of the invention
  • Fig. 6 schematically shows a cross-section of the transverse element according to a third embodiment of the invention.
  • FIG. 7 schematically shows a top view of a part of the transverse element in a variant of the first embodiment of the invention.
  • the diagrammatic illustration of Figure 1 shows a drive belt 3 which runs over two pulleys 1, 2. In the illustrated position, the top pulley 1 rotates more quickly than the bottom pulley 2.
  • the so-called running radius R of the drive belt 3 on the respective pulleys 1, 2 can be changed, as a result of which the speed difference between the two pulleys 1,2 can be varied as desired.
  • This is a known manner of varying a difference in rotational speed between two shafts.
  • the drive belt 3 is shown in cross section.
  • This figure shows a cross section of two band sets 31 and a front view of a transverse element 32, of which the drive belt 3 comprises a considerable number, arranged over the periphery of the band sets 31.
  • Both the transverse elements 32 and the bands of the band sets 31 are made of metal.
  • the transverse elements 32 are able to move freely in the longitudinal direction of the band sets 31, so that when a force is transmitted between the pulleys 1, 2, this force is transmitted by the transverse elements 32 pressing against one another.
  • the band sets 31 in this case guide the transverse elements 32.
  • a band set 31 consists of five bands, although in practice a band set 31 can comprise more bands, even up to twelve or more.
  • Each transverse element 32 which is also shown in side view in Figure 3, is provided with two cut-outs 33 located opposite one another, each for accommodating one of the two band sets 31, so that a first or base part 34 of the transverse element 32 extends below the band sets 31, a second or neck part 35 of the transverse element 32 is situated between the band sets 31 and a third or head part 36 of the transverse element 32 extends above the band sets 31.
  • a respective cut-out 33 is delimited at the bottom by a so-called saddle surface 42 of the base part 34 that faces upwards, i.e. in the general direction of the head part 36.
  • the saddle surface 42 is provided with a convex curvature in the longitudinal direction of the drive belt 3, i.e. as seen in figure 3.
  • a radius of curvature of the saddle surface 42 is referred to as the short saddle radius SSR.
  • the lateral or pulley contact surfaces 37 of said base part 34 of the transverse element 32 are oriented at an angle ⁇ with respect to one another, which corresponds at least substantially to a V-angle ⁇ defined between the conical discs 4,5 of the pulleys 1,2 (see Fig. 1).
  • a rear side 38 of the transverse element 32 is substantially flat, while a so-called tilting line 18 is provided on a front side 39 of the transverse element 32.
  • the transverse element 32 in side view has an essentially constant thickness and below the tilting line 18 said base part 34 tapers towards the bottom side of the transverse element 32.
  • the tilting line 18 is typically provided in the form of a slightly rounded section of the front side 39 of the transverse element 32.
  • the front side 39 of the transverse element 32 comes into contact with the rear side 38 of an adjacent transverse element 32 at the location of the tilting line 18, both in the straight sections of the drive belt 3 between the pulleys 1, 2 and in the curved sections thereof on the pulleys 1, 2.
  • the transverse element 32 is also provided with a protuberance 40 on the front side 39 and a recess 41 on the rear side 38, the protuberance 40 and the recess 41 of two transverse elements 32 abutting in the drive belt 3 mating, as a result of which a displacement with respect to one another in a direction oriented at right angles to the longitudinal direction of the drive belt 3 is limited to a tolerance of the protuberance 40 in the recess 41 in this direction.
  • FIG. 4 three embodiments of the transverse element 32 according to the invention are represented by a cross-section of only the base part 34 thereof in the cross-sectional plane A-A indicated in figure 2, which plane includes the height direction H (see figs.2&3) and the longitudinal direction L (see fig.3) of the belt 3 and which plane is thus oriented in the width direction W (see fig.2) .
  • the saddle surface 42 is provided with a single groove 50 that is oriented in the width direction of the transverse element 32.
  • the groove 50 is located centrally in the saddle surface as seen in the longitudinal direction.
  • the groove 50 is designed such that at least a bottom surface part thereof does not contact the band set 31.
  • lubricant is accommodated in the groove 50 for the lubrication of the sliding contact between the transverse element 32 and the band set 31 to reduce a wear rate thereof and/or to decrease friction there between.
  • the groove or grooves 50 are 25 to 250 micron (i.e. ⁇ ) deep (when measured perpendicular and relative to an imaginary contour of the saddle surface 42 uninterrupted by the grooves 50) , more preferably around 50 to 100 micron, and make up 5 to 50%, more preferably around 25%, of an overall (imaginary, uninterrupted) surface area of the saddle surface 42.
  • the parts pi and p2 of the saddle surface 42 on either side of the groove 50 which parts pi, p2 do arrive in direct physical contact with the band set 31, are provided with the same dimensions. It may, however, be advantageous to provide these parts pi, p2 with mutually different heights.
  • Such design principle is illustrated in figure 5 in a second embodiment of the transverse element 32 according to the invention. This second embodiment incorporates a groove 50 and a step 51 in the saddle surface 42, whereof the higher lying parts pi and p2 of the saddle surface 42 on either side of the groove 50 are flat and are provided with a mutually different height.
  • the saddle surface 42 may approximate the conventionally applied, convexly curved shape even though the said higher lying parts pi and p2 as such present an essentially flat surface.
  • the saddle surface 42 is provided with two grooves 50 that are both oriented in the width direction of the transverse element 32. Additionally, a central part p3 of the saddle surface 42 located in between the two grooves 50 extends in height direction to above side parts pi and p2 of saddle surface 42 that are respectively located on the opposite side of one of said two grooves 50.
  • the central part p3 and the side parts pi, p2 of the saddle surface 42 may approximate the conventionally applied, convexly curved shape, however, favourably without these saddle surface parts pi, p2 and p3 as such having to be provided with a curved cross-sectional contour.
  • the height of the respective parts pi, p2, p3 of the saddle surface 42 is chosen such that a virtual arc drawn through the mid-points thereof in the cross-section of figure 5, approximates a circle segment, preferably having a radius of curvature that approximates a running radius R of the drive belt 3 on the pulleys 1, 2 of the transmission, preferably the smallest running radius occurring during operation of the transmission.
  • FIG 7 a variant of the above first embodiment of the transverse element 32 according to the invention is illustrated with a top view of a section of the saddle surface 42, viewed downwards in the height direction H (as indicated by arrow point B in fig. 3) .
  • Figure 7 illustrates that, in accordance with the invention, a higher lying part pi, p2 of the saddle surface 42 need not necessarily be formed as a single continuous plane pi extending over the full (in this case width) dimension . of the saddle surface 42, but may just as well be formed . by two or more isolated islands p2 surrounded by a lower lying part or parts z of the saddle surface 42 that include the said groove or grooves 50.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmissions By Endless Flexible Members (AREA)

Abstract

La présente invention se rapporte à une courroie d'entraînement (3) comprenant un ensemble de bandes (31) et un certain nombre d'éléments transversaux (32). Selon l'invention, chaque élément transversal (32) comprend : une découpe (33) qui est prévue pour recevoir l'ensemble de bandes (31); une partie inférieure (34) qui s'étend au-dessous de la découpe (33) dans le sens de la hauteur; une partie supérieure (36) qui s'étend au-dessus de la découpe (33) dans le sens de la hauteur; et une partie de col (35) qui relie la partie inférieure (34) à la partie supérieure (36). Selon l'invention, la découpe (33) est partiellement délimitée par une surface formant selle (42) de la partie inférieure (34). La surface formant selle (42) comprend au moins une gorge (50) entre deux parties s'étendant plus haut (p1; p2; p3) de la surface formant selle (42).
PCT/EP2009/009244 2009-12-23 2009-12-23 Courroie d'entraînement et élément transversal d'une courroie d'entraînement WO2011076235A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09799284A EP2516889A1 (fr) 2009-12-23 2009-12-23 Courroie d'entraînement et élément transversal d'une courroie d'entraînement
PCT/EP2009/009244 WO2011076235A1 (fr) 2009-12-23 2009-12-23 Courroie d'entraînement et élément transversal d'une courroie d'entraînement
CN200980163501.9A CN103339408B (zh) 2009-12-23 2009-12-23 传动带和用于传动带的横向元件

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/009244 WO2011076235A1 (fr) 2009-12-23 2009-12-23 Courroie d'entraînement et élément transversal d'une courroie d'entraînement

Publications (1)

Publication Number Publication Date
WO2011076235A1 true WO2011076235A1 (fr) 2011-06-30

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PCT/EP2009/009244 WO2011076235A1 (fr) 2009-12-23 2009-12-23 Courroie d'entraînement et élément transversal d'une courroie d'entraînement

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Country Link
EP (1) EP2516889A1 (fr)
CN (1) CN103339408B (fr)
WO (1) WO2011076235A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1041120B1 (en) * 2014-12-23 2016-10-11 Bosch Gmbh Robert An endless metal band with a coated surface, a drive belt provided with the endless metal band and method for shaping the drive belt.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2013116A (en) 1978-01-31 1979-08-08 Volvo Car Bv Driving belt with transverse elements provided with curved belt-bearing surfaces
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
EP0014014A1 (fr) * 1979-01-30 1980-08-06 Van Doorne's Transmissie B.V. Courroie de transmission composite, bande métallique sans fin pour courroie de transmission et procédé de fabrication d'une telle bande
JPH0389050A (ja) * 1989-08-30 1991-04-15 Mitsuboshi Belting Ltd 高負荷伝動用ベルト
JPH0519704U (ja) * 1991-08-22 1993-03-12 三ツ星ベルト株式会社 高負荷伝動用ベルト
JPH0530590U (ja) * 1991-03-27 1993-04-23 三ツ星ベルト株式会社 高負荷伝動用ベルト
JPH0547586U (ja) * 1991-11-28 1993-06-25 三ツ星ベルト株式会社 高負荷伝動用ベルト
DE10357849A1 (de) * 2003-12-11 2005-07-07 Zf Friedrichshafen Ag Schubgliederband eines Kegelscheiben-Umschlingungsgetriebes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9200537A (nl) * 1992-03-24 1993-10-18 Doornes Transmissie Bv Dwarselement voor een drijfriem.
NL9201608A (nl) * 1992-09-17 1994-04-18 Doornes Transmissie Bv Dwarselement voor een eindloos overbrengingsorgaan.
JP4168839B2 (ja) * 2003-03-06 2008-10-22 日産自動車株式会社 金属ベルト

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2013116A (en) 1978-01-31 1979-08-08 Volvo Car Bv Driving belt with transverse elements provided with curved belt-bearing surfaces
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
EP0014014A1 (fr) * 1979-01-30 1980-08-06 Van Doorne's Transmissie B.V. Courroie de transmission composite, bande métallique sans fin pour courroie de transmission et procédé de fabrication d'une telle bande
US4332575A (en) 1979-01-30 1982-06-01 Van Doorne's Transmissie B.V. Composite driving belt
JPH0389050A (ja) * 1989-08-30 1991-04-15 Mitsuboshi Belting Ltd 高負荷伝動用ベルト
JPH0530590U (ja) * 1991-03-27 1993-04-23 三ツ星ベルト株式会社 高負荷伝動用ベルト
JPH0519704U (ja) * 1991-08-22 1993-03-12 三ツ星ベルト株式会社 高負荷伝動用ベルト
JPH0547586U (ja) * 1991-11-28 1993-06-25 三ツ星ベルト株式会社 高負荷伝動用ベルト
DE10357849A1 (de) * 2003-12-11 2005-07-07 Zf Friedrichshafen Ag Schubgliederband eines Kegelscheiben-Umschlingungsgetriebes

Also Published As

Publication number Publication date
CN103339408B (zh) 2015-12-09
EP2516889A1 (fr) 2012-10-31
CN103339408A (zh) 2013-10-02

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