WO2014191723A1 - Étoffe tissée pour courroie de transmission comprenant un fil texturé et un fil de faible frottement - Google Patents

Étoffe tissée pour courroie de transmission comprenant un fil texturé et un fil de faible frottement Download PDF

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Publication number
WO2014191723A1
WO2014191723A1 PCT/GB2014/051579 GB2014051579W WO2014191723A1 WO 2014191723 A1 WO2014191723 A1 WO 2014191723A1 GB 2014051579 W GB2014051579 W GB 2014051579W WO 2014191723 A1 WO2014191723 A1 WO 2014191723A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarn
woven fabric
belt
fabric
bundle
Prior art date
Application number
PCT/GB2014/051579
Other languages
English (en)
Inventor
Elizabeth Fry
Brian Thomas Roocroft
Original Assignee
Heathcoat Fabrics Limited
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 Heathcoat Fabrics Limited filed Critical Heathcoat Fabrics Limited
Publication of WO2014191723A1 publication Critical patent/WO2014191723A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/0094—Belts
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/49—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads textured; curled; crimped
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/58—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads characterised by the coefficients of friction
    • 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
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
    • 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
    • F16G1/00—Driving-belts
    • F16G1/28—Driving-belts with a contact surface of special shape, e.g. toothed
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/04—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons
    • D10B2321/042—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides

Definitions

  • This invention relates to a fabric particularly, although not exclusively, one which can be incorporated in a transmission or timing belt (herein generally referred to as belts).
  • the belts may be used in automobile engines as well as in other industrial uses.
  • Such belts include toothed belts, V belts and multi-ribbed V belts.
  • Some conventional transmission or timing belts include a fabric covering at least a portion of one or both main surfaces of the belt.
  • the fabric is used to increase the durability of the belt and to reduce noise (squealing or squeaking during use) particularly at start-up.
  • Nylon is known for use in belt fabrics but, particularly in the case of toothed belts, such belts remain prone to failure.
  • Alternative materials have also been considered for use in belt fabrics for providing belts with improved performance characteristics and durability.
  • thermoplastic belt is described with a wear resistant, anti-static fabric on its surface such as a fabric containing silver-coated polymeric fibre.
  • Woven fabric has been used for either the back or working surface of the belt.
  • US 2008/0261739 describes a V-ribbed belt that includes a textile warp knitted fabric which has two different yarn substances on the working surface of the belt.
  • a transmission belt is described comprising a woven fabric for use as a backing fabric on a toothed belt.
  • the fabric uses the same yarn substance for all of the weft yarns but uses both an S-twisted yarn and a Z-twisted yarn side-by- side in a Panama or twill weave.
  • EP 1035353 a power transmission belt is described which includes polytetrafluoroethylene (PTFE) fibres dispersed throughout a composition forming an outer surface of the belt.
  • PTFE polytetrafluoroethylene
  • US 4302197 a fabric is described which has different characteristics on either surface: one surface has a high adhesive characteristic whereas the other surface has a low-friction characteristic.
  • EP 1436450 describes a yarn for use in a belt fabric in which the yarn comprises an elastic core around which is wrapped PTFE. This yarn is one of two different weft yarns used in the woven fabric, with each weft being separated from adjacent wefts by the warp yarn.
  • the present invention seeks to mitigate problems encountered to date with transmission belts having a fabric surface.
  • the present invention also seeks to provide an improved fabric suitable for forming at least a portion of at least one surface of a transmission belt.
  • the present invention further seeks to provide a woven fabric which is suitable for forming at least a portion of at least one surface of a transmission belt and which avoids or reduces fraying of the woven fabric yarns during use of the transmission belt in contrast to existing woven fabrics.
  • a woven fabric for use in a transmission or timing belt comprising: a first yarn; and a yarn bundle woven with the first yarn, the yarn bundle comprising at least second and third yarns, the second yarn being a texturized thermoplastic yarn and the third yarn comprising a friction reducing substance wherein the second and third yarns are not separated from one another in the yarn bundle by the first yarn.
  • neither the second yarn nor the third yarn includes an elastic core thread.
  • the fabric according to the present invention has a low-friction surface which is soft or yielding due to its bulk but which is also extensible i.e. stretchable. This enables the fabric to conform, for example, to the 3D structure of a toothed belt without significant loss of bulk and thereby substantially maintain the durability and other performance characteristics of the fabric when forming the surface of a transmission or timing belt.
  • the fabric is suited for use on either or both of part or all of the tooth-facing surface and the opposing back surface of a transmission or synchronous timing belt.
  • the second yarn which is a texturized thermoplastic material, is preferably Nylon 66.
  • the third yarn which comprises a low-friction substance ideally includes a substance preferably having a coefficient of friction of less than 0.5, in accordance with A.S.T.M. D.1984 method.
  • the substance is PTFE.
  • the first yarn is a continuous filament material.
  • the first yarn is selected from the following group: Polyamide, Polyester or other thermoplastic materials, aramids, PPS, PEEK , PTFE.
  • the yarn bundle comprises an equal number of second yarns and third yarns.
  • the yarn bundle comprises more second yarns than third yarns.
  • the yarn bundle may comprise two second yarns and one third yarn.
  • the yarn bundle may comprise at least a fourth yarn which is different to the second and third yarns.
  • the first yarn may be present in the warp direction of the fabric with the yarn bundle present in the weft direction of the fabric, or vice versa.
  • the first yarn and the yarn bundle form a twill weave or a non-directional weave.
  • a belt comprising a fabric described above.
  • the belt preferably further comprises a substrate to which the fabric described above is adhered or otherwise attached.
  • the fabric may be adhered or otherwise attached to the working surface of the belt.
  • the working surface of the belt may include a plurality of protrusions, that may be regularly spaced, for example in the form of teeth, intended for contact with the moving parts of an engine or the like.
  • the substrate may additionally comprise a filler material.
  • the belt may further comprise a core material, which can be any material known in the art, examples being resilient glass fibre, para-aramid, PBO (Poly-p-phenylobenzobisthiazole) (ZylonTM) or the like.
  • the belt is preferably, but not exclusively, for use in automotive applications, particularly automobile engines or the like.
  • the belt is preferably adapted for use as a transmission or timing belt.
  • a method of forming a fabric a method of forming a woven fabric, comprising weaving a first yarn and a yarn bundle together, wherein the yarn bundle comprises at least second and third yarns, the second yarn being a texturised thermoplastic yarn and the third yarn comprising a friction reducing substance and wherein the second and third yarns are not separated from one another in the yarn bundle by the first yarn; and subsequently finishing the woven fabric to develop the bulking characteristics of the textured yarn.
  • the first yarn and the yarn bundle are woven in a twill or non directional weave construction.
  • a yarn bundle or a weft bundle is to be understood as reference to two or more yarns jointly functioning as a single weft or warp in the woven fabric whereby at no point in the fabric is the weft bundle broken or separate by the warp or vice versa.
  • the two or more yarns forming the yarn bundle are preferably arranged side-by-side.
  • Figures 1 a, 1 b and 1 c are photographic images of conventional transmission belts with a woven fabric on the toothed surface;
  • Figure 2 illustrates a weave pattern for a fabric according to the present invention
  • Figure 3 is a view of a typical second yarn according to the present invention
  • Figure 4 is a view of a typical third yarn according to the present invention
  • Figure 5 shows a first outer surface of a fabric according to the present invention
  • Figure 6 shows a second surface of a fabric according to the present invention
  • Figure 7 shows a cross-section through a transmission belt with a fabric according to the present invention.
  • Figure 8 is a photographic image of a timing belt in accordance with the claimed invention with a woven fabric on the toothed surface.
  • a woven fabric 1 suitable for use in forming a surface of a transmission or timing belt is illustrated in Figure 2.
  • the fabric 1 has a twill weave with a warp yarn 2 and a weft bundle of first and second yarns 3, 4 in each weft line.
  • the two yarns 3, 4 in each weft bundle are different from one another and the two yarns 3, 4 of each weft bundle are woven in the fabric side-by-side so that within the body of the fabric at no point are the individual yarns of the weft bundle separated from one another by the warp yarn.
  • Figure 2 shows only two weft yarns in the weft bundle, each weft bundle may comprise more than two threads.
  • the weft bundle may include a third weft yarn which is different to the first and second weft yarns, such as a low melt yarn, and / or the weft bundle may include multiples of either or both of the different weft yarns.
  • each weft bundle may comprise at least an equal number of the two different first and second weft yarns or may comprise a different number of first yarns to second yarns.
  • each weft line of the fabric weave comprises a plurality of yarns consisting of at least two different yarns.
  • the first yarn 3 is shown in Figure 3 which has been extracted from the woven fabric after the fabric finishing process or processes.
  • the first yarn 3 is a thermoplastic yarn such as, but not limited to, Nylon 66.
  • the first yarn 3 preferably does not contain or comprise PTFE or another low-friction substance.
  • the first yarn 3 also does not contain or comprise a core of an elastic material.
  • the first weft yarn 3 has been texturized, which has the effect of forming crimps or crinkles in the filaments of the yarn and bulks out the yarn and contributes to the stretch of the resultant woven fabric.
  • the second weft yarn 4 is shown in Figure 4, which has also been extracted from the woven fabric after the fabric finishing process or processes.
  • the second weft yarn 4 is a low friction yarn (i.e. having a yarn surface which presents a lower friction in comparison to the thermoplastic yarn) and does not have an elastic core.
  • the low friction yarn 4 preferably comprises PTFE but alternative low friction yarns are also envisaged.
  • the yarn should be sufficiently flexible to be susceptible to the contractive force of the accompanying nylon yarn so that the nylon yarn is able to force the low friction yarn into a crimped state, which delivers the required stretchability of the resultant fabric.
  • the warp yarn 2 in the woven fabric is a continuous filament type (Nylon 66 for example, Polyamide, Polyester or other thermoplastic materials, aramids, PPS, PEEK, PTFE).
  • ylon 66 for example, Polyamide, Polyester or other thermoplastic materials, aramids, PPS, PEEK, PTFE.
  • thermoplastic yarn 3 contracts which adds bulk to the fabric whereas the low-friction yarn 4 becomes crimped but does not bulk out in the manner of the thermoplastic yarn 3.
  • the fabric When the woven fabric is intended for use on the tooth-side of the belt, the fabric has a stretch capability in the range 30-200%, more preferably in the range 50-150%, more preferably still >60% at 2 kg using a 25 mm strip.
  • the woven fabric may be, but need not be, treated with a RFL dip.
  • the latex part is optionally carboxylated HNBR, VP-SBR, CR, CS or VP.
  • RFL is a system for providing adhesion of textiles to other substrates such as rubbers.
  • RF is resorcinol formaldehyde resin and a latex is added to that resin which is suitable or compatible for the particular rubber to be adhered to.
  • Alternative conventional processes for improving the adhesion or attachment of the woven fabric to the belt substrate are also envisaged.
  • Figure 7 illustrates diagrammatically a synchronous timing belt 5 comprising the fabric 1 described above.
  • the belt 5 comprises a rubber substrate 6 with a fabric covered working surface 7.
  • Tension members 8, such as glass cord, are provided within the substrate 6.
  • the working surface 7 includes teeth 9 for cooperating with a pulley system or the like in use.
  • An exemplary twill weave fabric construction is as follows:
  • Second weft yarn 440 d'tex PTFE
  • Woven fabric according to the above Example (T-07282) was subjected to the standard abrasion resistance test for coated fabrics ASTM D3389-10.
  • the standard abrasion resistance test employs a rotary platform abrader available from Taber Industries which has a circular specimen holder adapted to rotate within its own plane about a central axis. A flat sample of the woven fabric is mounted on the specimen holder and a pair of abrasive wheels are pivoted into position to form peripheral engagement with the upper surface of the sample and to apply a predetermined loading to the surface of the sample.
  • the direction of travel of the periphery of the abrasive wheels is at an acute angle to the rotation of the sample with the angle of travel of one wheel being opposite to that of the other.
  • Each abrasive wheel is 13 mm thick, has a diameter of approximately 50 mm and the contacting surface of the wheel has a predetermined grade of abrasive quality.
  • a vacuum nozzle is also provided immediately above the sample to capture and remove abraded particles that may be produced.
  • the starting weight of the sample is measured and the sample is then rotated under the abrasive wheels for a predetermined number of revolutions. Periodically during the test rotation may be stopped to enable any loose abraded particles lying on the surface of the sample to be removed. Once the predetermined number of revolutions is reached, any remaining loose abraded particles are removed from the surface of the sample and the end weight of the sample is measured.
  • Abrasive wheels H-18 (vitrified wheel)
  • Specimen type Fabric, cut to 4 inch squares and adhered to a piece of cardboard with double sided tape
  • Vacuum nozzle height 0.25 in
  • Specimen type Fabric, cut to 4 inch squares and adhered to a piece of cardboard with double sided tape
  • Vacuum nozzle height 0.25 in
  • Weight loss Initial weight - Final weight
  • Wear Index (Weight loss x 1000)/number of cycles of revolution.
  • the PTFE yarn in the woven fabric 1 is believed to provide a lubrication effect resulting in PTFE material transferring to adjacent thermoplastic yarns. It is reasonable to assume that this lubrication/smearing effect would also be transferred to the pulley surfaces within a timing belt system, thus further reducing the co-efficient of friction of the timing belt, when entering and exiting the pulleys.
  • the woven fabric comprising a warp yarn and two or more different weft yarns, it is to be understood that these could be swapped and that the woven fabric may comprise a weft yarn and a warp bundle of two or more different warp yarns woven such that the weft yarn does not separate the warp yarns.
  • the yarn bundle may include more than a single thread of Nylon 66 and a single thread of PTFE and whilst it is preferred that there is an equal number of threads of each material in the yarn bundle, this is not an essential feature.
  • both the Nylon 66 and the PTFE may be replaced by other materials having similar characteristics.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Woven Fabrics (AREA)

Abstract

L'invention concerne une étoffe (1) comprenant un fil de chaîne (2) tissé avec un faisceau de fils comprenant un premier fil (3) et un second fil différent (4), l'un des deux fils dans le faisceau de fils de trame comprenant une substance réduisant le frottement. L'étoffe (1) convient particulièrement à une utilisation sur la surface d'une courroie dentée telle qu'une courroie de transmission ou une courroie de distribution et présente une résistance à l'abrasion accrue.
PCT/GB2014/051579 2013-05-31 2014-05-22 Étoffe tissée pour courroie de transmission comprenant un fil texturé et un fil de faible frottement WO2014191723A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1309793.6A GB201309793D0 (en) 2013-05-31 2013-05-31 Fabric
GB1309793.6 2013-05-31

Publications (1)

Publication Number Publication Date
WO2014191723A1 true WO2014191723A1 (fr) 2014-12-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2014/051579 WO2014191723A1 (fr) 2013-05-31 2014-05-22 Étoffe tissée pour courroie de transmission comprenant un fil texturé et un fil de faible frottement

Country Status (2)

Country Link
GB (1) GB201309793D0 (fr)
WO (1) WO2014191723A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3034906A1 (fr) * 2014-12-19 2016-06-22 ContiTech Antriebssysteme GmbH Courroie comprenant un revêtement textile
WO2019118081A1 (fr) * 2017-12-13 2019-06-20 Gates Corporation Courroie de transmission de puissance à frottement à bande
CN114194707A (zh) * 2021-12-08 2022-03-18 上海永利输送系统有限公司 一种差异摩擦系数输送带及其制备方法和应用

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1436450A1 (fr) * 2001-10-10 2004-07-14 JOHN HEATHCOAT & COMPANY LIMITED Tissu
EP1813835A2 (fr) * 2006-01-31 2007-08-01 Mitsuboshi Belting Ltd. Courroie dentée de transmission avec étoffe de couverture
WO2011003090A1 (fr) * 2009-07-02 2011-01-06 The Gates Corporation Tissu amelioré pour courroie de transmission dentée et courroie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1436450A1 (fr) * 2001-10-10 2004-07-14 JOHN HEATHCOAT & COMPANY LIMITED Tissu
EP1813835A2 (fr) * 2006-01-31 2007-08-01 Mitsuboshi Belting Ltd. Courroie dentée de transmission avec étoffe de couverture
WO2011003090A1 (fr) * 2009-07-02 2011-01-06 The Gates Corporation Tissu amelioré pour courroie de transmission dentée et courroie

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3034906A1 (fr) * 2014-12-19 2016-06-22 ContiTech Antriebssysteme GmbH Courroie comprenant un revêtement textile
WO2019118081A1 (fr) * 2017-12-13 2019-06-20 Gates Corporation Courroie de transmission de puissance à frottement à bande
CN111630299A (zh) * 2017-12-13 2020-09-04 盖茨公司 带式摩擦功率传送带
JP2021507189A (ja) * 2017-12-13 2021-02-22 ゲイツ コーポレイション バンドされた摩擦動力伝達ベルト
US11028900B2 (en) 2017-12-13 2021-06-08 Gates Corporation Banded friction power transmission belt
AU2018385310B2 (en) * 2017-12-13 2021-11-04 Gates Corporation Banded friction power transmission belt
CN114194707A (zh) * 2021-12-08 2022-03-18 上海永利输送系统有限公司 一种差异摩擦系数输送带及其制备方法和应用
CN114194707B (zh) * 2021-12-08 2024-04-02 上海永利输送系统有限公司 一种差异摩擦系数输送带及其制备方法和应用

Also Published As

Publication number Publication date
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