EP4348077A1 - Courroie à nervures en v - Google Patents

Courroie à nervures en v

Info

Publication number
EP4348077A1
EP4348077A1 EP22724414.2A EP22724414A EP4348077A1 EP 4348077 A1 EP4348077 A1 EP 4348077A1 EP 22724414 A EP22724414 A EP 22724414A EP 4348077 A1 EP4348077 A1 EP 4348077A1
Authority
EP
European Patent Office
Prior art keywords
textile
ribbed
ribbed belt
belt
rubber
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.)
Pending
Application number
EP22724414.2A
Other languages
German (de)
English (en)
Inventor
Henning Kanzow
Stephanie KAUTZ
Roman Gaska
Timo Sebastian KASAK
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.)
Contitech Deutschland GmbH
Original Assignee
ContiTech Antriebssysteme 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 ContiTech Antriebssysteme GmbH filed Critical ContiTech Antriebssysteme GmbH
Publication of EP4348077A1 publication Critical patent/EP4348077A1/fr
Pending legal-status Critical Current

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
    • F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
    • F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
    • F16G5/08—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber with textile reinforcement
    • 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
    • F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed

Definitions

  • the invention relates to a V-ribbed belt with an elastic base body made up of at least one rubber mixture, comprising a cover layer as the back of the belt and a ribbed substructure with a power transmission side.
  • Ribbed V-belts are usually closed endlessly when they are functional and are used in motor vehicles with combustion engines in the ancillary unit, e.g. to drive the generator, also known as the alternator. Excessive noise during operation should be avoided. A particularly unpleasant noise is the chirping noise that occurs when the pulleys in the V-ribbed belt drive are not on the same level, i.e. are offset, or are crooked, for example, due to bearing wear.
  • V-ribbed belts are provided with a special surface on the ribbed functional side.
  • textile coatings or textile overlays on the functional side have proven effective for suppressing chirp noise.
  • the disadvantage of the textile coatings or textile coverings is that they reduce friction. Too little friction leads to increased slip and thus to energy transmission losses, which can heat up the belt and greatly reduce belt life.
  • the textile layer must be sufficiently abrasion-resistant for use in motor vehicles.
  • V-belts with various textile layers made of pure polyamide or polyamide yarns in combination with elastic polyurethane threads have good wear resistance and offer very good protection against misalignment noises, but do not have good power transmission capability when wet.
  • engines are started directly by the belt instead of using the traditional pinion starter. Especially with those applications it is necessary that the belt also has sufficient power transmission capacity in wet conditions.
  • textile covers made of cotton are used, for example, as described in WO2009/030529 A1, for example.
  • Belts with cotton textile layers have a significantly better power transmission capability in wet conditions, which is also reflected in a higher CoF (“coefficient of friction”) in wet conditions.
  • the cotton textile covers usually provide a sufficiently good protection against misalignment noises.
  • their wear resistance is significantly worse than that of textile covers made of pure polyamide. Wear of the textile lining means that the belts lose their protection against misalignment noise.
  • EP2981735B1 also discloses ribbed V-belts with elastic knitted textile coverings, which consist mainly of either cotton or polyamide, possibly with PU threads as secondary yarn, and have basis weights of at least 150 or 200 g/m 2 .
  • the disadvantage of these pads is that they either have good power transmission capability in the wet or good abrasion resistance, but do not need both at the same time and require a relatively large amount of material.
  • EP2864658 A1 in turn describes a plated knitted fabric, ie a knitted fabric which was produced by knitting together two threads lying one behind the other, in which one thread can consist of a polyamide and the other thread can consist of cotton. It is thus possible for the outer side of the knitted fabric to consist primarily of cotton, thus producing a belt that has a high coefficient of friction (CoF) in wet conditions due to its outward-facing cotton side and, at the same time, improved wear resistance due to its polyamide side Has.
  • CoF coefficient of friction
  • such a plated knit requires a lot more yarn than a non-plated knit, which leads to significant additional costs.
  • the wear resistance is not sufficient for some applications.
  • DE 201705898 A1 discloses a plated knitted fabric which consists of at least two yarn types which alternate at regular intervals in the individual rows of stitches. This makes it possible, for example, for threads made of polyamide as well as threads made of cotton to be located on the surface. In the case of a V-ribbed belt, the coefficient of friction can be adapted to the application. In addition, such textiles are a very good protection against misalignment noises. The power transmission capability when wet is almost as great as that of a textile that only has cotton threads on the outside. However, such "multiple plated" knits have the same disadvantages as mentioned above; they require much more yarn than non-plated knits, which leads to significant additional costs. In addition, the wear resistance is still not sufficient for some applications.
  • Improved abrasion resistance would be desirable, particularly for aggressive belt starter generator applications.
  • V-ribbed belt that has a textile cover or a textile coating that can be produced inexpensively, offers good protection against chirping noises, has good power transmission capability in the dry and wet state and is also abrasion-resistant. Furthermore, the belt should have a long service life in the form of good flexural fatigue resistance in use.
  • the ribbed power transmission side of the V-ribbed belt has a coating made of a textile made up of meshes, with at least one row of meshes made of a first material A, based on the entire textile, made of non-plated threads with at least one row of meshes made of a second material B made up of non-plated threads, so that the first material A and the second material B are present on each of the two surfaces of the textile.
  • the V-ribbed belt can be produced more cost-effectively without any disadvantages in terms of protection against Chirping noises, the power transmission capability in the dry and in the wet state or the abrasion resistance result when a textile is used in which at least one row of stitches made of a first material A made up of non-plated threads is combined with at least one row of stitches made of a second material B made up of non-plated threads Alternating threads, so that the first material A and the second material B are present on each of the two surfaces of the textile.
  • textile overlay and textile coating are used synonymously in the following.
  • the textile made up of meshes can be a knitted fabric or a knitted fabric. It is preferably a knitted fabric, a fabric being referred to as a knitted fabric which is produced from one or more threads or from one or more thread systems by stitch formation.
  • the textile has an average basis weight before vulcanization of between 70 g/m 2 and 140 g/m 2 , particularly preferably between 70 g/m 2 and 120 g/m 2 , the basis weight of the textile according to DIN EN 12127 , edition 1997-12.
  • Textile overlays with a higher basis weight require more yarn material and, in addition, tend to have insufficient power transmission capability when dry.
  • Belts with textile layers with a lower weight per unit area usually have low flexural fatigue strength and often also poor noise behavior when the pulleys are misaligned.
  • At least one row of stitches made of a first material A made up of non-plated threads alternates with at least one row of stitches made of a second material B made up of non-plated threads.
  • any natural or synthetic material can be used alone or in combination as material A and as material B. From the designation of material A and material B it follows that the two materials must be different from each other.
  • cellulose fibers particularly preferably cotton fibers, are used as material A.
  • multifilament fibers made of polyamide preferably PA6 or PA6.6, particularly preferably PA6, are used as material B.
  • the textile can also contain at least one elastic auxiliary thread, which consists of a third material C and melts or completely or partially decomposes as a result of the vulcanization.
  • the auxiliary thread is plated.
  • the elastic auxiliary thread preferably has an elongation at break according to DIN EN ISO 2062:1995 of more than 100%.
  • a typical example of such elastic auxiliary threads are threads that consist of at least 85% by weight of polyurethane and are known by the term “elastane” or “spandex” in English-speaking countries.
  • the auxiliary elastic thread of a third material C can be co-knitted with the non-plated threads of material A and/or the non-plated threads of material B.
  • the V-ribbed belt can have an open textile joint which is transverse to the belt circumferential direction and consists only of the elastomeric material of the substructure and preferably has a width of 0.5 to 6 mm.
  • the belt preferably has a PK profile according to ISO 9981 with a profile depth of between 1.6 and 2.6 mm, preferably between 1.8 and 2.2 mm. Belts with a lower tread depth tend to slip too much and have poorer wear resistance. If the profile depth is too great, the belt becomes too thick overall, which reduces its resistance to flexural fatigue.
  • the elastic base body is preferably based on at least one rubber mixture.
  • the rubber mixture of the base body contains at least one rubber component.
  • EPM ethylene-propylene rubber
  • EPDM ethylene-propylene-diene rubber
  • HNBR hydrogenated nitrile rubber
  • FKM fluorine rubber
  • NR natural rubber
  • SBR rubber component
  • BR butadiene rubber
  • EPM or EPDM or an EPM/EPDM blend is used in particular for the substructure with the power transmission side.
  • the EPM, EPDM or the blend of EPM and EPDM is peroxidically crosslinked.
  • the rubber mixture of the base body also contains at least one filler.
  • This is advantageously at least one carbon black or at least one silica.
  • the combination of carbon black and silica has proven to be particularly suitable. All silicas known in the rubber industry, preferably precipitated silicas, can be used here. It is also possible to use all known types of carbon black, in particular fumace and thermal carbon blacks such as SAF, SCF, HAF, FF, FEF, XCF, HMF, GPF, SRF, MPF, FT or MT, with FEF carbon blacks being particularly preferred.
  • the mixture ingredients of the rubber mixture additionally comprise at least one crosslinker or a crosslinker system (crosslinking agent and accelerator). Further Mixing ingredients are usually also processing aids and/or plasticizers and/or aging inhibitors and optionally other additives, for example fibers for the purpose of reinforcement, and color pigments. However, a fiber-free mixture is preferred. In this regard, reference is made to the general state of rubber compound technology.
  • ribbed V-belts with a base body based on a peroxide-crosslinked rubber mixture with 100 phr EPDM were produced, both for the top layer and for the substructure.
  • the EPDM mixture also contained 7 phr of cotton fibers in addition to other mixture components. The addition of fibers increases the tear propagation resistance of the elastomer mixture.
  • the Shore A hardness of the vulcanized mixture according to DIN ISO 7619-1 (February 2012) was 85.
  • the belts contain aramid cords with a diameter of approx. 0.75 mm as tension members.
  • 6PK V-ribbed belts with a length of 1330 mm and a PK profile with a profile depth of 2.3 or 2.0 mm were used for the heat bending cycle (HBW) test and the noise test.
  • 6PK belts with a length of 1268 mm and a tread depth of 2.0 mm were used for the RSG wear test.
  • the coefficient of friction (CoF, Coefficient of Friction according to SAE J 2432) was also determined dry and wet.
  • a dry CoF value of between 1.45 and 1.85 is considered good. Belts with lower ratings may not transfer enough power in some applications. Dry CoF values greater than 1.85 tend to cause misalignment noises.
  • the wet CoF values are a measure of the power transmission capability of the belts in wet conditions. Wet CoF values greater than 0.75 are considered positive.
  • HBW heat bending cycle test
  • the test was carried out constantly at an ambient temperature of 130°C.
  • the noise test bench has a ribbed drive pulley with a diameter of 130 mm.
  • the load strand follows an unprofiled deflection pulley with a diameter of 65 mm and a ribbed pulley with a 60 mm diameter and a driven pulley with a 50 mm diameter.
  • the belts were tensioned with a strand force of 330N and driven by the drive pulley at 1000 revolutions per minute.
  • the drive roller itself is driven by an electric motor via a cardan joint, which ensures non-uniform movement of the drive roller.
  • the ribbed roller When carrying out the noise test, the ribbed roller is deflected forward from the zero position perpendicular to the ribbed V-belt drive, resulting in an offset between the profiled pulleys in the ribbed V-belt drive.
  • the strand of the belt between the deflection roller and the profiled roller is deflected by an angle a out of the plane enclosed by the belt, which caused chirping noises to occur with some belts.
  • Belts that did not make any noise even when misaligned by up to 2° were rated as good "+”.
  • Belts that showed no noise up to 1.5° but noise at 2° were rated as satisfactory “o”.
  • Belts that also develop noise at less than 1.5° of misalignment were considered to be bad in terms of noise rated.
  • the heart of the RSG test bench is the "E-machine" with a profiled V-ribbed belt pulley (with a diameter of 63 mm), which either brakes the belt (“recuperation”) or accelerates it (“boost”) or loads it constantly or simply runs along with it there are transitional periods. Both strands adjacent to the roller are tensioned by the double tensioner with its non-profiled back rollers (diameter 60 mm). The belt goes through the 19.5 second test cycle, in which different phases alternate. The test cycles are repeated until the belts either fail due to chipping, wear, tearing or cord pay-out or until the defined end time is reached.
  • Textile overlays that contain both polyamide and cotton (plus an auxiliary elastic thread). However, considerably more material has to be used for this, which can be seen from the higher basis weights.
  • the textile overlays 7 and 8 are typical representatives of the plated knitted fabrics described in EP2864658 A1. The best results were achieved with a textile overlay shown in Example 9. With regard to the main threads cotton and polyamide, it is not knitted in a plated manner according to the invention and requires significantly less material than the plated knitted textile layers 7 and 8. In addition, both the wear behavior of the belt with the textile layer 9 is surprisingly better compared to the comparative belt 8 and its HBW Duration.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne une courroie à nervures en V ayant un corps principal élastique constitué d'au moins un composé de caoutchouc, comprenant une couche supérieure en tant que dos de courroie et une sous-structure dotée d'un côté transmission de puissance nervuré. Afin d'améliorer le frottement et d'optimiser la durée de vie utile, la courroie à nervures en V présente sur son côté transmission de puissance nervuré un revêtement constitué d'un textile formé par des mailles. Par rapport à l'ensemble du textile, au moins une rangée de mailles d'un premier matériau (A) formé par des fils non plaqués alterne avec au moins une rangée de mailles d'un second matériau (B) formé par des fils non plaqués, de telle sorte que le premier matériau (A) et le second matériau (B) sont présents sur chacune des deux surfaces du textile.
EP22724414.2A 2021-06-03 2022-05-09 Courroie à nervures en v Pending EP4348077A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021205665.2A DE102021205665A1 (de) 2021-06-03 2021-06-03 Keilrippenriemen
PCT/DE2022/200092 WO2022253390A1 (fr) 2021-06-03 2022-05-09 Courroie à nervures en v

Publications (1)

Publication Number Publication Date
EP4348077A1 true EP4348077A1 (fr) 2024-04-10

Family

ID=81748995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22724414.2A Pending EP4348077A1 (fr) 2021-06-03 2022-05-09 Courroie à nervures en v

Country Status (3)

Country Link
EP (1) EP4348077A1 (fr)
DE (1) DE102021205665A1 (fr)
WO (1) WO2022253390A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021201705A1 (de) 2021-02-23 2022-08-25 Contitech Antriebssysteme Gmbh Keilrippenriemen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007042917B4 (de) 2007-09-08 2020-06-18 Contitech Antriebssysteme Gmbh Biegeelastischer Antriebsriemen, oder Keilrippenriemen, mit einer Textilauflage auf seiner verschleißanfälligen Arbeitsseite
FR2936291B1 (fr) * 2008-09-23 2011-06-03 Hutchinson Courroie de transmission de puissance.
DE102012105510A1 (de) 2012-06-25 2014-02-20 Contitech Antriebssysteme Gmbh Artikel, insbesondere Antriebsriemen, mit einer Textilauflage
FR3003923B1 (fr) 2013-04-02 2015-11-13 Hutchinson Courroie de transmission de puissance presentant une denture a base elastomerique munie, en surface, d'un tricot.
WO2018216738A1 (fr) * 2017-05-24 2018-11-29 三ツ星ベルト株式会社 Courroie striée et procédé de fabrication correspondant
ES2748214B2 (es) * 2019-06-13 2022-02-01 Gates Corp Correa de transmision de potencia con superficie a franjas y una tela de recubrimiento a franjas.

Also Published As

Publication number Publication date
DE102021205665A1 (de) 2022-12-08
WO2022253390A1 (fr) 2022-12-08

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