EP1272777A1 - Frictionally engaged driving belt - Google Patents

Frictionally engaged driving belt

Info

Publication number
EP1272777A1
EP1272777A1 EP01938071A EP01938071A EP1272777A1 EP 1272777 A1 EP1272777 A1 EP 1272777A1 EP 01938071 A EP01938071 A EP 01938071A EP 01938071 A EP01938071 A EP 01938071A EP 1272777 A1 EP1272777 A1 EP 1272777A1
Authority
EP
European Patent Office
Prior art keywords
drive belt
rubber
aramid fibers
fibers
frictional drive
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.)
Ceased
Application number
EP01938071A
Other languages
German (de)
French (fr)
Inventor
Reinhard Teves
Jörg WOLTERS
Klaus-Lüder MAHNKEN
Joachim Nau
Reinhold Moses
Tobias Nonnast
Ymte Greydanus
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 Antriebssysteme 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 EP1272777A1 publication Critical patent/EP1272777A1/en
Ceased 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
    • 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
    • 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

Definitions

  • the invention relates to a frictional drive belt with a base body and a cover layer made of rubber or rubber-like plastic, which has a tension member layer embedded in the rubber or rubber-like plastic.
  • V-belts To frictional drive belts or power transmission belts, such as. B. flat belts, V-belts, V-ribbed belts or toothed V-belts with open flanks, which are generally used where large transmission ratios have to be realized, high demands are placed on wear resistance, noise and dynamic resilience. So drive belts are used for. B. for power transmission in areas of application from office machines to the heaviest machine drives. Driving belts are also used in a wide variety of designs in motor vehicles, especially where decoupling of vibrations of the driving unit and the driving unit is important. V-ribbed belts are used, for example, in motor vehicles to drive the alternator. V-ribbed belts offer the advantage that they combine the high flexibility of the flat belt with the efficient power transmission of the V-belt and can also be used in the most complicated drive designs with counter-bending by means of deflection and back tensioning pulleys.
  • the outer surfaces of the belts are subjected to a wide variety of weather and operating media influences. Despite these influences, the belts should have a long service life and, at the same time, the running noises should be reduced, particularly in the automotive and home-quality industries.
  • Noises occur in drive elements in which belts provide power transmission by means of frictional engagement, often when e.g. B. in damp, cold weather in the friction behavior between the belt surface and drive pulley friction conditions occur, which cause squeaky tones by oscillation or vibration. These noises can be prevented or suppressed by various measures.
  • different approaches have already been proposed in order to reduce the noise development with frictional drive belts. If you go z. B. from the manufacturing process for V-ribbed belts, in which two manufacturing processes, the grinding process and the molding process, have prevailed, it is known to reduce the noise of the belt on the
  • Pulley to mix fibers into the rubber compound that forms the ribs Pulley to mix fibers into the rubber compound that forms the ribs.
  • the grinding process for belts with fiber-containing mixtures is e.g. B. from the
  • EP 642 886 A1 known.
  • belt blanks are first produced and vulcanized, which have a smooth outer surface. Then the
  • the fibers added to the mixture are preferably oriented transversely to the belt circulation direction. In the grinding process, the ribs are then ground out so that fiber tips protrude from the mixture surface.
  • the ribs are then ground out so that fiber tips protrude from the mixture surface.
  • polyamides such as. As nylon, or aramids can be used.
  • the favorable noise behavior of such belts is often not maintained over the entire life of the belt, since the rib surfaces grind smoothly on the pulleys and then no outstanding fibers remain, which bring about the favorable friction conditions and a reduction in noise.
  • Belts are therefore currently being produced in which an adhesive layer is applied to the rubber mixture plate for the ribs, to which in turn short fibers are applied in a coating process, as is disclosed, for example, in US Pat. No. 3,190,137. Due to the concentrated application in a thin layer, the fibers effectively reduce noise and at the same time in most cases they improve abrasion. Generally layers of short cotton fibers are used, which show a good compromise between cost and noise reduction. Wool is not suitable for the current thermal stresses. For synthetic fibers such as aliphatic polyester, e.g. B.
  • the present invention is based on the object of providing frictional drive belts which prevent or reduce noise development in belt drives.
  • This object is achieved according to the invention in that only the surface or a part of the surface of the drive belt, preferably the movement-transmitting part of the surface, is provided with a flocking material made of short aramid fibers, with a part of the aramid fibers, preferably the predominant number of aramid fibers, only with a partial length of each individual fiber is integrated into the surface.
  • aramid fibers which are known to be synthetic fibers, are very good at generating noise prevent or cause a very good noise insulation. This positive behavior is apparently particularly pronounced when the aramid fibers are concentrated on the surface of the belt. Because a belt that is manufactured using the grinding process or the surface of which is ground after production using the molding process and that contains aramid fibers incorporated into the rib mixture, showed no better noise behavior than a belt with fibers made of another material. The incorporated aramid fibers only improve the abrasion behavior compared to other incorporated fibers with good abrasion-resistant fiber tips.
  • the drive belts according to the invention can be, for. B. flat belts, V-belts, V-ribbed belts or toothed V-belts with open flanks, it being possible for the entire surface of the drive belt to be provided with the flocking material made of short aramid fibers.
  • the positive influence of the coating with aramid fibers is particularly noticeable where the belt comes into direct contact with pulleys, rollers or wheels and where oscillation and vibration can occur.
  • the belt can, for example, be provided with flocking material made of short aramid fibers on its back, since it often runs past tension or deflection films with the belt back.
  • the belt on its movement-transmitting part of the surface is flocked with the aramid fibers, since different friction conditions with resulting noises (squeaking) are particularly noticeable on this part of the surface.
  • Under the flocked surface there may be a rubberized reinforcement fabric (sheathing fabric), which additionally protects the belt from abrasion and already has a certain positive influence on friction behavior and noise.
  • the drive belts according to the invention can be produced by ecologically and economically favorable molding processes, no material has to be ground off. Since no fibers have to be incorporated into the mixture, a higher overall flexibility of the mixture can be achieved than with mixtures containing fibers.
  • the use of aramid fibers offers the advantage over the use of cotton fibers that aramid fibers do not absorb water, i.e. they do not swell. The friction behavior of a belt provided with aramid fibers is therefore much more independent of the moisture content in the environment.
  • the aramid fibers advantageously have a length of 0.1 to 6 mm and a diameter of 5 to 25 ⁇ m.
  • fibers are longer and thinner, processing problems arise since the fibers clump together in a cotton-like form and cannot be dosed evenly for flocking. If the length of the fibers in the case of a V-ribbed belt exceeds approximately three to four times the spacing between the ribs, this can lead to shaping problems in rib production. In addition, fiber lengths in the specified range have proven to be optimal for anchoring. Shorter fibers do not penetrate sufficiently into the adhesive layer and lie more or less like a powder on the surface to be flocked. Too long fibers penetrate enough, but due to the unfavorable ratio of the integrated to the non-integrated fiber length, they can be easily held or pinched and are easier to pull out or tear when the belt is in operation.
  • the belt surface of the unvulcanized belt is prepared by swelling with a solvent or by previously applying an adhesive or an adhesive solution so that the fibers can adhere to the surface.
  • the fibers are then mechanically sprinkled, blown or shaken, or with the help of an electric field or through
  • aramids for the flocking fibers both copolymers of essentially terephthalic acid and p-phenylenediamine (para-aramids), e.g. B. Kevlar ® or Twaron ® , as well as copolymers of essentially m-phenylenediamine and isophthalic acid (meta-aramids), for. B. Nomex ® can be used.
  • para-aramids e.g. B. Kevlar ® or Twaron ®
  • metal-aramids e.g. B. Nomex ®
  • other monomers can also be copolymerized into the copolymers. So can too
  • Terpolymers of terephthalic acid, p-phenylenediamine and other monomers such as. B. Technora ® can be applied. Copolymers of terephthalic acid and p-phenylenediamine such as Kevlar ® or Twaron ® offer good stiffness of the fibers and thus good noise insulation. However, these materials are not as dynamic dynamically as they can break under extreme dynamic loads. Meta-aramids such as Nomex are much more durable and dynamically stable, but form less noise insulation due to their greater flexibility; they also offer the advantage of being dyeable and avoiding the rather unsightly yellow color that straps based on Kevlar ® , Twaron ® or Technora ® have. Terpolymers of terephthalic acid, p-phenylenediamine and other monomers such as Technora ® are in the two
  • the drive belt or parts of the drive belt have a polymer-containing outer coating which is firmly connected and / or cross-linked by a vulcanization process with the rubber or rubber-like plastic of the base body and / or the cover layer, and a part
  • the aramid fibers are only included in this coating with a partial length of each individual fiber.
  • the polymer-containing outer coating acts as an adhesive for the fibers and additionally offers the advantage that, due to the intimate connection with the rubber or rubber-like plastic of the belt, it connects the fibers extremely firmly to the belt surface.
  • This polymer-containing coating can be, for example, rubber solutions, urethane systems or systems based on cyanoacrylate in organic solvents.
  • These polymer-containing coating solutions are those that contain suitable polymers either alone or with fillers and vulcanization systems.
  • suitable polymers either alone or with fillers and vulcanization systems.
  • preference is given to choosing those which give good binding to the rubber mixture to be coated.
  • Adhesive systems are often added to such solutions, which also ensure the adhesion between the coating solution and the mixture underneath to the fibers.
  • Adhesive systems are preferred modified phenolic resins or resorcinol resins, which contain formaldehyde donor systems such as hexamethoxymethylmelamines or urotropins as hardeners.
  • Adhesive solutions for such uses are preferably provided with vulcanization systems based on sulfur or peroxide.
  • Sulfur systems then contain accelerators based on sulfenamide, dithiocarbamate, guanidine or thiuram or other systems
  • peroxide systems can contain salts or esters of polymerized unsaturated organic acids such as acrylic acid or methacrylic acid
  • the polymer-containing coating can be such that the belt is thereby improved with regard to further relevant properties.
  • the abrasion and thus the service life, the friction behavior and also the noise behavior can be additionally influenced.
  • This can e.g. B. happen that the polymer-containing outer coating has fluoropolymers.
  • the fluoropolymers can particularly influence the sliding behavior of surfaces and are extremely inert and non-fogging.
  • polytetrafluoroethylene (PTFE) is used as the fluoropolymer.
  • copolymers or terpolymers such as, for example, ethylene-tetrafluoroethylene copolymers or tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymers.
  • Such polymers are e.g. B. available under the trade name Dyneon THV ® from Dyneon GmbH.
  • the drive belt is a V-ribbed member, the rib surface of which is provided with the flocking material made of short aramid fibers.
  • the positive influence of the coating with short aramid fibers on the noise development in belt drives was particularly great
  • the drive belts according to the invention can be produced by methods known to those skilled in the art.
  • Fig. 1 shows schematically the cross section of a V-ribbed belt with flocked ribs
  • Fig. 2 shows schematically the cross section of a V-belt, the ribs of which are provided with a polymer-containing outer coating and flocking
  • the V-ribbed element shown in FIG. 1 has a cover layer 1 and a base body 2 made of rubber or rubber-like plastic and a tension-bearing layer 3 embedded in the rubber or rubber-like plastic.
  • the ribs 4 of the V-belt are flocked with short aramid fibers 5, which are integrated into the surface of the ribs 4 only with a partial length of each individual fiber
  • FIG. 2 shows the cross section of a V-belt with base body 2, top layer 1 and tension-bearing layer 3, which has a polymer-containing outer coating 6 on its ribs 4, in which the short aramid fibers 5 are only integrated with a partial length of each individual fiber.
  • V-ribs shown in Figures 1 and 2 have z. B. used in belt drives to drive the power generator in motor vehicles on a significantly reduced noise.

Abstract

The invention relates to a frictionally engaged driving belt having a base body (2) and a cover layer (1) that consists of rubber or a rubber-like synthetic material which is provided with a tractive support layer (3) that is embedded into the rubber or the rubber-like synthetic material. The aim of the invention is to prevent or reduce the generation of noise in drives of the belts. Only the surface or a portion of the surface, preferably the motion-transferring part of the surface, pertaining to the driving belt is provided with a flocking material consisting of short aramide fibres (5). A portion of said aramide fibres (5) is integrated into the surface only with a partial length of each individual fibre.

Description

Beschreibung description
Reibschlüssiger TreibriemenFrictional drive belt
Die Erfindung betrifft einen reibschlüssigen Treibriemen mit einem Grundkörper und einer Decklage aus Gummi oder gummiähnlichem Kunststoff, der eine in den Gummi oder den gummiähnlichen Kunststoff eingebettete Zugträgerlage aufweist.The invention relates to a frictional drive belt with a base body and a cover layer made of rubber or rubber-like plastic, which has a tension member layer embedded in the rubber or rubber-like plastic.
An reibschlüssige Treibriemen oder Kraftübertragungsriemen, wie z. B. Flachriemen, Keilriemen, Keilrippenriemen oder flankenoffene gezahnte Keilriemen, die im Allgemeinen dort eingesetzt werden, wo große Übersetzungsverhältnisse realisiert werden müssen, werden hohe Anforderungen hinsichtlich Verschleißfestigkeit, Geräusch und dynamischer Belastbarkeit gestellt. So dienen Treibriemen z. B. zur Kraftübertragung in Einsatzbereichen von Büromaschinen bis hin zu schwersten Maschinenbauantrieben. Treibriemen werden in vielfältigen Ausführungen auch in der Kraftfahrzeugen verwendet und zwar besonders dort, wo es auf eine Entkopplung von Schwingungen des antreibenden Aggregates und des abtreibenden Aggregates ankommt. Keilrippenriemen werden beispielsweise im Kraftfahrzeug zum Antrieb des Stromgenerators (Alternators) eingesetzt. Keilrippenriemen bieten dabei den Vorteil, dass sie die hohe Flexibilität des Flachriemens mit der effizienten Leistungsübertragung des Keilriemens verbinden und auch in kompliziertesten Antriebskonstruktionen mit Gegenbiegung durch Umlenk- und Rückenspannrollen eingesetzt werden können.To frictional drive belts or power transmission belts, such as. B. flat belts, V-belts, V-ribbed belts or toothed V-belts with open flanks, which are generally used where large transmission ratios have to be realized, high demands are placed on wear resistance, noise and dynamic resilience. So drive belts are used for. B. for power transmission in areas of application from office machines to the heaviest machine drives. Driving belts are also used in a wide variety of designs in motor vehicles, especially where decoupling of vibrations of the driving unit and the driving unit is important. V-ribbed belts are used, for example, in motor vehicles to drive the alternator. V-ribbed belts offer the advantage that they combine the high flexibility of the flat belt with the efficient power transmission of the V-belt and can also be used in the most complicated drive designs with counter-bending by means of deflection and back tensioning pulleys.
In Antriebselementen werden die Außenflächen der Riemen unterschiedlichsten Witterungs- und Betriebsmedieneinflüssen unterworfen. Trotz dieser Einflüsse sollen die Riemen eine lange Lebensdauer aufweisen und gleichzeitig sollen die Laufgeräusche vor allem im Kraftfahrzeug- und Hausgüte ndustriebereich vermindert werden. Geräusche entstehen bei Antriebselementen, bei denen Riemen mittels Reibschluß für die Kraftübertragung sorgen, oftmals, wenn z. B. bei feuchter, kalter Witterung im Reibverhalten zwischen Riemenoberfläche und Antriebsscheibe Reibverhältnisse auftreten, die quietschende Töne durch Oszillation oder Vibration hervorrufen. Diese Geräusche können durch unterschiedliche Maßnahmen verhindert oder gedämmt werden. Um die Geräuschentwicklung bei reibschlüssigen Treibriemen zu vermindern, sind je nach Herstellverfahren schon unterschiedliche Wege vorgeschlagen worden. Geht man z. B. von den Herstell verfahren für Keilrippenriemen aus, bei denen sich im Wesentlichen zwei Herstellverfahren, das Schleifverfahren und das Formverfahren, durchgesetzt haben, so ist es bekannt, zur Verringerung der Geräuschentwicklung des Riemens auf derIn drive elements, the outer surfaces of the belts are subjected to a wide variety of weather and operating media influences. Despite these influences, the belts should have a long service life and, at the same time, the running noises should be reduced, particularly in the automotive and home-quality industries. Noises occur in drive elements in which belts provide power transmission by means of frictional engagement, often when e.g. B. in damp, cold weather in the friction behavior between the belt surface and drive pulley friction conditions occur, which cause squeaky tones by oscillation or vibration. These noises can be prevented or suppressed by various measures. Depending on the manufacturing process, different approaches have already been proposed in order to reduce the noise development with frictional drive belts. If you go z. B. from the manufacturing process for V-ribbed belts, in which two manufacturing processes, the grinding process and the molding process, have prevailed, it is known to reduce the noise of the belt on the
Riemenscheibe in die Kautschukmischung, die die Rippen bildet, Fasern einzumischen.Pulley to mix fibers into the rubber compound that forms the ribs.
Das Schleifverfahren für Riemen mit faserhaltigen Mischungen ist z. B. aus derThe grinding process for belts with fiber-containing mixtures is e.g. B. from the
EP 642 886 A1 bekannt. Beim Schleifverfahren werden zuerst Riemenrohlinge hergestellt und vulkanisiert, die eine glatte äußere Oberfläche haben. Anschließend werden dieEP 642 886 A1 known. In the grinding process, belt blanks are first produced and vulcanized, which have a smooth outer surface. Then the
Rippen in die vulkanisierte Riemenoberfläche eingeschliffen. Durch die Kalanderprozesse während der Herstellung der Mischungenplatten für die Riemen sind die der Mischung zugesetzten Fasern bevorzugt quer zur Riemenumlaufrichtung ausgerichtet. Im Schleifprozeß werden dann die Rippen so herausgeschliffen, dass Faserspitzen aus der Mischungsoberfläche herausragen. Für das Einmischen in Kautschukmischung können als Fasermaterialien beispielsweise Baumwolle, Polyester, Polyamide, wie z. B. Nylon, oder Aramide verwendet werden. Das günstige Geräuschverhalten derartiger Riemen bleibt häufig nicht über die gesamte Lebensdauer der Riemen erhalten, da sich die Rippenoberflächen auf den Scheiben glattschleifen und dann keine herausragenden Fasern mehr verbleiben, die die günstigen Reibbedingungen und eine Geräuschverminderung bewirken.Ribs ground into the vulcanized belt surface. Due to the calendering processes during the production of the mixture plates for the belts, the fibers added to the mixture are preferably oriented transversely to the belt circulation direction. In the grinding process, the ribs are then ground out so that fiber tips protrude from the mixture surface. For mixing in rubber mixture, for example cotton, polyester, polyamides, such as. As nylon, or aramids can be used. The favorable noise behavior of such belts is often not maintained over the entire life of the belt, since the rib surfaces grind smoothly on the pulleys and then no outstanding fibers remain, which bring about the favorable friction conditions and a reduction in noise.
Beim Schleifverfahren wird ein großer Teil der oft sehr teuren faserverstärkten Mischung als Schleifabfall verworfen. Die Alternative zum Schleifverfahren ist daher das ökologisch und ökonomisch fortschrittlichere Formverfahren zur Herstellung von Keilrippenriemen, das zudem präziser ist als das Schleifverfahren. Hierbei werden beim Vulkanisationsvorgang die Rippen in eine im Wesentlichen glatte Platte des unvulkanisierten Riemenrohlings eingeprägt. Auch beim Formverfahren können Fasern mit in die Kautschukmischung, die die Rippen bildet, eingemischt und in dieser mit einvulkanisiert werden, wie es beispielsweise in der US 5,904,630 offenbart ist. Die Fasern folgen dabei im Inneren der Rippen der Rippenkontur. Zusätzlich ist es aus der US 5,904,630 bekannt, die Rippen des nach dem Formverfahren hergestellten Riemens noch oberflächlich anzuschleifen, um die in der Mischung verteilten Fasern herauszuarbeiten und damit eine Oberfläche mit herausragenden Fasern zu erzielen. Die Haltbarkeit dieser geräuschvermindernden Schicht ist vergleichbar mit der beim herkömmlichen Schleifverfahren erzeugten. Beiden Verfahren gemeinsam ist, dass die oftmals teuren Fasern in der gesamten Dicke des Rippengummis vorhanden sind, obwohl sie nur an der Oberfläche benötigt werden. Außerdem kann die Dichte der Fasern bedingt durch die gewünschten Eigenschaften einer Riemenmischung, wie Flexibilität oder Verarbeitbarkeit, nicht beliebig erhöht werden. Typische Werte für den Faseranteil in einer Riemenmischung liegen bei 2 bis 30 Gewichtsteilen Fasern pro 100 Gewichtsteile Gesamtelastomer. Effektiver ist es hingegen die Fasern nur dort zu plazieren, wo sie auch benötigt werden, nämlich an den Rippenoberflächen. Es werden daher derzeit Riemen hergestellt, bei denen auf die Kautschukmischungsplatte für die Rippen eine Haftschicht aufgebracht wird, auf welche wiederum kurze Fasern in einem Beschichtungsvorgang aufgebracht werden, wie es beispielsweise in der US 3,190,137 offenbart ist. Die Fasern bewirken durch die konzentrierte Aufbringung in einer dünnen Schicht eine effektive Geräuschverminderung und gleichzeitig bewirken sie in den meisten Fällen eine Abriebsverbeεserung. Verwendet werden im Allgemeinen Schichten aus kurzen Baumwollfasem, die einen guten Kompromiß aus Kosten und Geräuschverminderung zeigen. Wolle ist bei den vorliegenden thermischen Beanspruchungen nicht geeignet. Für Synthesefasern wie aliphatische Polyester, z. B. auf Basis von Polyethylenterephthalat oder Polyethylennaphthenat, Polyamid 6 oder Polyamid 6.6 wurde kein positiver Einfluß auf das Geräuschverhalten gefunden, so dass diese Fasern für eine Geräuschverminderung nicht sinnvoll einsetzbar sind. Die glatten Oberflächen dieser Synthesefasern scheinen dafür verantwortlich zu sein, dass offensichtlich keine befriedigenden positiven Beeinflussungen der Reibverhältnisse und der Geräuschdämmung bewirkt werden.In the grinding process, a large part of the often very expensive fiber-reinforced mixture is discarded as grinding waste. The alternative to the grinding process is therefore the ecologically and economically more advanced molding process for the production of V-ribbed belts, which is also more precise than the grinding process. Here, during the vulcanization process, the ribs are embossed into an essentially smooth plate of the unvulcanized belt blank. Also in the molding process, fibers can also be mixed into the rubber mixture that forms the ribs and vulcanized therein, as is disclosed, for example, in US Pat. No. 5,904,630. The fibers follow the rib contour inside the ribs. In addition, it is known from US Pat. No. 5,904,630 to grind the ribs of the belt produced by the molding process superficially in order to work out the fibers distributed in the mixture and thus to achieve a surface with outstanding fibers. The durability of this noise-reducing layer is comparable to that of the conventional grinding process. Common to both methods is that the often expensive fibers are present in the entire thickness of the rib rubber, although they are only required on the surface. In addition, the density of the fibers cannot be increased arbitrarily due to the desired properties of a belt mixture, such as flexibility or processability. Typical values for the fiber content in a belt mixture are 2 to 30 parts by weight of fibers per 100 parts by weight of total elastomer. However, it is more effective to place the fibers only where they are needed, namely on the rib surfaces. Belts are therefore currently being produced in which an adhesive layer is applied to the rubber mixture plate for the ribs, to which in turn short fibers are applied in a coating process, as is disclosed, for example, in US Pat. No. 3,190,137. Due to the concentrated application in a thin layer, the fibers effectively reduce noise and at the same time in most cases they improve abrasion. Generally layers of short cotton fibers are used, which show a good compromise between cost and noise reduction. Wool is not suitable for the current thermal stresses. For synthetic fibers such as aliphatic polyester, e.g. B. on the basis of polyethylene terephthalate or polyethylene naphthenate, polyamide 6 or polyamide 6.6, no positive influence on the noise behavior was found, so that these fibers are not useful for reducing noise. The smooth surfaces of these synthetic fibers seem to be responsible for the fact that there is obviously no satisfactory positive influence on the friction conditions and noise insulation.
Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, reibschlüssige Treibriemen bereitzustellen, die in Riementrieben eine Geräuschentwicklung verhindern oder vermindern.The present invention is based on the object of providing frictional drive belts which prevent or reduce noise development in belt drives.
Gelöst wird diese Aufgabe erfindungsgemäß dadurch, dass nur die Oberfläche oder ein Teil der Oberfläche des Treibriemens, bevorzugt der bewegungsübertragende Teil der Oberfläche, mit einem Beflockungsmaterial aus kurzen Aramidfasern versehen ist, wobei ein Teil der Aramidfasern, vorzugsweise die überwiegende Anzahl der Aramidfasern, nur mit einer Teillänge jeder einzelnen Faser in die Oberfläche eingebunden ist.This object is achieved according to the invention in that only the surface or a part of the surface of the drive belt, preferably the movement-transmitting part of the surface, is provided with a flocking material made of short aramid fibers, with a part of the aramid fibers, preferably the predominant number of aramid fibers, only with a partial length of each individual fiber is integrated into the surface.
Überraschender Weise wurde festgestellt, dass Aramidfasern, bei denen es sich bekanntlich um Synthesefasern handelt, die Entstehung von Geräuschen sehr gut verhindern bzw. eine sehr gute geräuschliche Dämmung bewirken. Dieses positive Verhalten ist offenbar besonders ausgeprägt, wenn die Aramidfasern konzentriert auf der Oberfläche des Riemens zum Liegen kommen. Denn ein Riemen, der nach dem Schleifverfahren hergestellt ist oder dessen Oberfläche nach der Herstellung mit dem Formverfahren angeschliffen wird und der in die Rippenmischung eingearbeitete Aramidfasern enthält, zeigte kein besseres Geräuschverhalten, als ein Riemen mit Fasern aus einem anderen Material. Die eingearbeiteten Aramidfasern bewirken im Vergleich zu anderen eingearbeiteten Fasern lediglich eine Verbesserung der Abriebverhaltens durch gut abriebbeständige Faserspitzen.Surprisingly, it was found that aramid fibers, which are known to be synthetic fibers, are very good at generating noise prevent or cause a very good noise insulation. This positive behavior is apparently particularly pronounced when the aramid fibers are concentrated on the surface of the belt. Because a belt that is manufactured using the grinding process or the surface of which is ground after production using the molding process and that contains aramid fibers incorporated into the rib mixture, showed no better noise behavior than a belt with fibers made of another material. The incorporated aramid fibers only improve the abrasion behavior compared to other incorporated fibers with good abrasion-resistant fiber tips.
Bei den erfindungsgemäßen Treibriemen kann es sich um z. B. Flachriemen, Keilriemen, Keilrippenriemen oder flankenoffene gezahnte Keilriemen handeln, wobei die gesamte Oberfläche der Treibriemen mit dem Beflockungsmaterial aus kurzen Aramidfasern versehen sein kann. Der positive Einfluß der Beschichtung mit Aramidfasern macht sich aber besonders dort bemerkbar, wo der Riemen mit Scheiben, Rollen oder Rädern direkt in Berührung kommt und wo Oszillation und Vibration entstehen können. Der Riemen kann beispielsweise auf seinem Rücken mit dem Beflockungsmaterial aus kurzen Aramidfasern versehen sein, da er mit dem Riemenrücken häufig an Spann- oder Umlenkrolien vorbeiläuft. Besonders vorteilhaft ist es allerdings, wenn der Riemen an seinem bewegungsübertragende Teil der Oberfläche mit den Aramidfasern beflockt ist, da sich bei diesem Teil der Oberfläche unterschiedliche Reibverhältnisse mit daraus resultierenden Geräuschen (Quietschen) besonders stark bemerkbar machen. Unter der beflockten Oberfläche kann sich gegebenenfalls noch ein gummiertes Armierungsgewebe (Ummantelungsgewebe) befinden, welches den Riemen zusätzlich vor Abrieb schützt und bereits einen gewissen positven Einfluß auf Reibverhalten und Geräusch hat.The drive belts according to the invention can be, for. B. flat belts, V-belts, V-ribbed belts or toothed V-belts with open flanks, it being possible for the entire surface of the drive belt to be provided with the flocking material made of short aramid fibers. The positive influence of the coating with aramid fibers is particularly noticeable where the belt comes into direct contact with pulleys, rollers or wheels and where oscillation and vibration can occur. The belt can, for example, be provided with flocking material made of short aramid fibers on its back, since it often runs past tension or deflection films with the belt back. However, it is particularly advantageous if the belt on its movement-transmitting part of the surface is flocked with the aramid fibers, since different friction conditions with resulting noises (squeaking) are particularly noticeable on this part of the surface. Under the flocked surface there may be a rubberized reinforcement fabric (sheathing fabric), which additionally protects the belt from abrasion and already has a certain positive influence on friction behavior and noise.
Die erfindungsgemäßen Treibriemen können durch ökologisch und ökonomisch günstige Formverfahren hergestellt werden, es muß kein Material abgeschliffen werden. Da in die Mischung keine Fasern eingearbeitet werden müssen, kann man eine höhere Gesamtflexibilität der Mischung als bei Faser enthaltenden Mischungen erzielen. Die Verwendung von Aramidfasern bietet gegenüber der Verwendung von Baumwollfasern den Vorteil, dass Aramidfasern kein Wasser aufnehmen, also nicht quellen. Das Reibverhalten eines mit Aramidfasern versehenen Riemens ist damit wesentlich unabhängiger vom Feuchtegehalt der Umgebung. Die Aramidfasern weisen vorteilhafterweise eine Länge von 0,1 bis 6 mm und einen Durchmesser von 5 bis 25 μm auf. Sind die Fasern länger und dünner, ergeben sich Verarbeitungsprobleme, da die Fasern in watteähnlicher Form verklumpen und nicht für die Beflockung gleichmäßig dosiert werden können. Überschreitet die Faserlänge im Falle eines Keilrippenriemens etwa den drei- bis vierfachen Rippenabstand, so kann es zu Ausformungsproblemen in der Rippenfertigung kommen. Außerdem haben sich Faserlängen im angegebenen Bereich für die Verankerung als optimal herausgestellt. Kürzere Fasern dringen nicht genügend in die Haftschicht ein und liegen quasi wie ein Pulver auf der zu beflockenden Oberfläche. Zu lange Fasern dringen zwar genügend ein, sind aber durch das ungünstige Verhältnis von eingebundener zu nicht eingebundener Faserlänge leicht festhaltbar oder einklemmbar und werden im Betreib des Riemens leichter herausgezogen oder -gerissen.The drive belts according to the invention can be produced by ecologically and economically favorable molding processes, no material has to be ground off. Since no fibers have to be incorporated into the mixture, a higher overall flexibility of the mixture can be achieved than with mixtures containing fibers. The use of aramid fibers offers the advantage over the use of cotton fibers that aramid fibers do not absorb water, i.e. they do not swell. The friction behavior of a belt provided with aramid fibers is therefore much more independent of the moisture content in the environment. The aramid fibers advantageously have a length of 0.1 to 6 mm and a diameter of 5 to 25 μm. If the fibers are longer and thinner, processing problems arise since the fibers clump together in a cotton-like form and cannot be dosed evenly for flocking. If the length of the fibers in the case of a V-ribbed belt exceeds approximately three to four times the spacing between the ribs, this can lead to shaping problems in rib production. In addition, fiber lengths in the specified range have proven to be optimal for anchoring. Shorter fibers do not penetrate sufficiently into the adhesive layer and lie more or less like a powder on the surface to be flocked. Too long fibers penetrate enough, but due to the unfavorable ratio of the integrated to the non-integrated fiber length, they can be easily held or pinched and are easier to pull out or tear when the belt is in operation.
Es können sowohl gemahlene (Mahlflock) als auch geschnittene Fasern (Schnittflock) verwendet werden.Both ground (flake) and cut fibers (flake) can be used.
Für die Aufbringung der kurzen Aramidfasern wird die Riemenoberfläche des unvulkanisierten Riemens durch Anquellen mit einem Lösungsmittel oder durch das vorherige Auftragen eines Klebstoffs oder einer Haftlösung so präpariert, dass die Fasern auf der Oberfläche haften können. Die Fasern werden dann mechanisch durch Aufstreuen, Blasen oder Rütteln oder mit Hilfe eines elektrischen Feldes oder durchFor the application of the short aramid fibers, the belt surface of the unvulcanized belt is prepared by swelling with a solvent or by previously applying an adhesive or an adhesive solution so that the fibers can adhere to the surface. The fibers are then mechanically sprinkled, blown or shaken, or with the help of an electric field or through
Kombinationen der Methoden aufgebracht. Bei der Beflockung mit Hilfe eines elektrischen Feldes, auch elektrostatische Beflockung genannt, werden die Fasern durch eine Hochspannungselektrode aufgeladen, ausgerichtet und beschleunigt und fliegen entsprechend der Feldlinien zum Gegenpol, der zu beflockenden Oberfläche. Dieses Verfahren bietet den Vorteil, dass die Fasern. beim Beflockungsvorgang gleichmäßig und im Wesentlichen senkrecht auf der Oberfläche zum Liegen kommen. Außerdem werden die Fasern im elektrischen Feld stark beschleunigt, dadurch dringen sie tiefer in die Oberfläche ein, was wiederum eine bessere Verankerung bewirkt. Man kann durch die im Wesentlichen senkrecht in der Oberfläche stehenden Fasern eine sehr große Beflockungsdichte erzielen.Combinations of the methods applied. When flocking with the help of an electric field, also called electrostatic flocking, the fibers are charged, aligned and accelerated by a high-voltage electrode and fly according to the field lines to the opposite pole, the surface to be flocked. This procedure has the advantage of being the fibers. come to rest evenly and essentially vertically on the surface during the flocking process. In addition, the fibers are strongly accelerated in the electric field, which means that they penetrate deeper into the surface, which in turn results in better anchoring. A very high flocking density can be achieved by the fibers standing essentially vertically in the surface.
Damit eine elektrostatische Beflockung effektiv durchgeführt werden kann, hat es sich als sinnvoll erwiesen, die im unbehandelten Zustand nicht leitenden Aramidfasern mit einer antistatischen oder elektrisch leitfähigen Beschichtung (Präparation, Ausrüstung) zu versehen. Auf diese Weise können die Fasern schnell Ladungen aufnehmen und abgeben. Als Aramide für die Beflockungsfasern können sowohl Copolymehsate aus im Wesentlichen Terephthalsäure und p-Phenylendiamin (Para-Aramide), z. B. Kevlar® oder Twaron®, als auch Copolymerisate aus im Wesentlichen m-Phenylendiamin und Isophthalsäure (Meta-Aramide), z. B. Nomex®, verwendet werden. In die Copolymerisate können aber auch weitere Monomere mit einpolymerisiert sein. So können auchSo that electrostatic flocking can be carried out effectively, it has proven to be useful to provide the non-conductive aramid fibers with an antistatic or electrically conductive coating (preparation, finishing) in the untreated state. In this way, the fibers can quickly absorb and release charges. As aramids for the flocking fibers, both copolymers of essentially terephthalic acid and p-phenylenediamine (para-aramids), e.g. B. Kevlar ® or Twaron ® , as well as copolymers of essentially m-phenylenediamine and isophthalic acid (meta-aramids), for. B. Nomex ® can be used. However, other monomers can also be copolymerized into the copolymers. So can too
Terpolymerisate aus Terephthalsäure, p-Phenylendiamin und weiteren Monomeren wie z. B. Technora® angewendet werden. Copolymerisate aus Terephthalsäure und p- Phenylendiamin wie Kevlar® oder Twaron® bieten gute Steifigkeiten der Fasern und damit gute Geräuschdämmungen. Diese Materialien sind jedoch dynamisch nicht so dauerhaft, da sie unter extremer dynamischer Belastung brechen können. Meta-Aramide wie Nomex sind wesentlich dauerhafter und dynamisch stabiler, bilden aber wegen höherer Flexibilität geringere Geräuschdämmung; sie bieten darüber hinaus den Vorteil einfärbbar zu sein und die eher unansehnlich gelbe Farbe zu vermeiden, die Riemen auf Basis Kevlar®, Twaron® oder Technora® aufweisen. Terpolymerisate aus Terephthalsäure, p- Phenylendiamin und weiteren Monomeren wie Technora® sind in den beidenTerpolymers of terephthalic acid, p-phenylenediamine and other monomers such as. B. Technora ® can be applied. Copolymers of terephthalic acid and p-phenylenediamine such as Kevlar ® or Twaron ® offer good stiffness of the fibers and thus good noise insulation. However, these materials are not as dynamic dynamically as they can break under extreme dynamic loads. Meta-aramids such as Nomex are much more durable and dynamically stable, but form less noise insulation due to their greater flexibility; they also offer the advantage of being dyeable and avoiding the rather unsightly yellow color that straps based on Kevlar ® , Twaron ® or Technora ® have. Terpolymers of terephthalic acid, p-phenylenediamine and other monomers such as Technora ® are in the two
Haupteigenschaften Flexibilität und Beständigkeit unter dynamischer Belastung zwischen den reinen Meta- und Para-Aramiden einzuordnen.Main characteristics Flexibility and resistance to be classified under dynamic loading between the pure meta and para aramids.
Gemäß einer vorteilhaften Weiterbildung der Erfindung weist der Treibriemen oder weisen Teile des Treibriemens eine Polymer enthaltende, äußere Beschichtung auf, die durch einen Vulkanisationsprozeß mit dem Gummi oder gummiähnlichen Kunststoff des Grundkörpers und/oder der Decklage fest verbunden und/oder vernetzt ist, und ein Teil der Aramidfasern ist in diese Beschichtung nur mit einer Teillänge jeder einzelnen Faser eingebunden. Die Polymer enthaltende, äußere Beschichtung wirkt als Klebstoff für die Fasern und bietet zusätzlich den Vorteil, dass sie durch die innige Verbindung mit dem Gummi oder gummiähnlichen Kunststoff des Riemens die Fasern äußerst fest mit der Riemenoberfläche verbindet. Bei dieser Polymer enthaltenden Beschichtung kann es sich beispielsweise um Kautschuklösungen, Urethansysteme oder Systeme auf Basis von Cyanacrylat in organischen Lösungsmitteln handeln. Diese polymerhaltigen Beschichtungslösungen sind solche, die geeignete Polymere entweder allein oder mit Füllstoffen und Vulkanisationssystemen versehen enthalten. Vorzugsweise wählt man für Beschichtungslösungen solche, die gute Anbindung an die zu beschichtende Kautschukmischung ergeben. Solchen Lösungen werden häufig Haftsysteme zugesetzt, die die Anhaftung zwischen der Beschichtungslösung und der darunterliegenden Mischung aber auch zu den Fasern gewährleisten. Haftsysteme sind vorzugsweise modifizierte Phenolharze oder Resorcinharze, die als Harter Formaldehydspendersysteme wie Hexamethoxymethylmelamine oder Urotropine enthalten Haftlosungen für solche Einsätze sind bevorzugt mit Vulkanisationssystemen auf Schwefel- oder Peroxidbasis versehen. Schwefelsysteme enthalten dann Beschleuniger auf Sulfenamid-, Dithiocarbamat-, Guanidin- oder Thiurambasis oder anderen Systeme, Peroxidsysteme können Salze oder Ester polymensierter ungesättigter organischer Sauren wie Acrylsaure oder Methacrylsaure enthaltenAccording to an advantageous development of the invention, the drive belt or parts of the drive belt have a polymer-containing outer coating which is firmly connected and / or cross-linked by a vulcanization process with the rubber or rubber-like plastic of the base body and / or the cover layer, and a part The aramid fibers are only included in this coating with a partial length of each individual fiber. The polymer-containing outer coating acts as an adhesive for the fibers and additionally offers the advantage that, due to the intimate connection with the rubber or rubber-like plastic of the belt, it connects the fibers extremely firmly to the belt surface. This polymer-containing coating can be, for example, rubber solutions, urethane systems or systems based on cyanoacrylate in organic solvents. These polymer-containing coating solutions are those that contain suitable polymers either alone or with fillers and vulcanization systems. For coating solutions, preference is given to choosing those which give good binding to the rubber mixture to be coated. Adhesive systems are often added to such solutions, which also ensure the adhesion between the coating solution and the mixture underneath to the fibers. Adhesive systems are preferred modified phenolic resins or resorcinol resins, which contain formaldehyde donor systems such as hexamethoxymethylmelamines or urotropins as hardeners. Adhesive solutions for such uses are preferably provided with vulcanization systems based on sulfur or peroxide. Sulfur systems then contain accelerators based on sulfenamide, dithiocarbamate, guanidine or thiuram or other systems, peroxide systems can contain salts or esters of polymerized unsaturated organic acids such as acrylic acid or methacrylic acid
Außerdem kann die Polymer enthaltende Beschichtung so beschaffen sein, dass der Riemen dadurch hinsichtlich weiterer relevanter Eigenschaften verbessert wird So können z B der Abrieb und damit die Lebensdauer, das Reibverhalten und auch das Gerauschverhalten zusätzlich positiv beeinflußt werden. Dies kann z. B. dadurch geschehen, dass die Polymer enthaltende, äußere Beschichtung Fluorpolymere aufweist Die Flucrpolymere können besonders das Gleitverhalten von Oberflachen beeinflussen und sind äußerst inert und abnebbestandig. Gemäß einer bevorzugten Ausführungsform wird Polytetrafluorethylen (PTFE) als Fluorpolymer eingesetzt Bessere Anhaftung an das Polymer und damit verbesserte Verschleißbestandigkeiten werden jedoch durch Verwendung von Copolymeren oder Terpolymeren wie zum Beispiel Ethylen- Tetrafluorethyien-Copolymeren oder Tetrafluorethylen-Hexafluorpropylen- Vinylidenfluoπd-Terpolymeren erreicht. Solche Polymere sind z. B. unter dem Handelsnamen Dyneon THV® der Firma Dyneon GmbH erhältlich.In addition, the polymer-containing coating can be such that the belt is thereby improved with regard to further relevant properties. For example, the abrasion and thus the service life, the friction behavior and also the noise behavior can be additionally influenced. This can e.g. B. happen that the polymer-containing outer coating has fluoropolymers. The fluoropolymers can particularly influence the sliding behavior of surfaces and are extremely inert and non-fogging. According to a preferred embodiment, polytetrafluoroethylene (PTFE) is used as the fluoropolymer. However, better adhesion to the polymer and thus improved wear resistance are achieved by using copolymers or terpolymers such as, for example, ethylene-tetrafluoroethylene copolymers or tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymers. Such polymers are e.g. B. available under the trade name Dyneon THV ® from Dyneon GmbH.
Gemäß einer bevorzugten Ausfuhrungsform der Erfindung ist der Treibriemen ein Keilrippennemen, dessen Rippenoberflache mit dem Beflockungsmaterial aus kurzen Aramidfasern versehen ist. Bei dieser Ausfuhrungsform war der positive Einfluß der Beschichtung mit kurzen Aramidfasern auf die Gerauschentwicklung in Riementrieben besonders großAccording to a preferred embodiment of the invention, the drive belt is a V-ribbed member, the rib surface of which is provided with the flocking material made of short aramid fibers. In this embodiment, the positive influence of the coating with short aramid fibers on the noise development in belt drives was particularly great
Die erfindungsgemaßen Treibriemen können nach dem Fachmann bekannten Verfahren hergestellt werden.The drive belts according to the invention can be produced by methods known to those skilled in the art.
Im Folgenden wird die Erfindung anhand von Ausfuhrungsbeispielen im Zusammenhang mit den nachstehenden Figuren naher erläutert, ohne dass die Erfindung jedoch auf diese Beispiele beschrankt ist.The invention is explained in more detail below on the basis of exemplary embodiments in connection with the figures below, but the invention is not restricted to these examples.
Fig 1 zeigt schematisch den Querschnitt eines Keilrippenriemens mit beflockten Rippen Fig 2 zeigt schematisch den Querschnitt eines Keilnppenriemens, dessen Rippen mit einer Polymer enthaltenden, äußeren Beschichtung und einer Beflockung versehen sindFig. 1 shows schematically the cross section of a V-ribbed belt with flocked ribs Fig. 2 shows schematically the cross section of a V-belt, the ribs of which are provided with a polymer-containing outer coating and flocking
Der in Figur 1 dargestellte Keilrippennemen weist eine Decklage 1 und einen Grundkorper 2 aus Gummi oder gummiahnlichem Kunststoff sowie eine in den Gummi oder gummiahnlichen Kunststoff eingebettete Zugtragerlage 3 auf. Die Rippen 4 des Keilnppenriemens sind mit kurzen Aramidfasern 5 beflockt, die nur mit einer Teillange jeder einzelnen Faser in die Oberflache der Rippen 4 eingebunden sindThe V-ribbed element shown in FIG. 1 has a cover layer 1 and a base body 2 made of rubber or rubber-like plastic and a tension-bearing layer 3 embedded in the rubber or rubber-like plastic. The ribs 4 of the V-belt are flocked with short aramid fibers 5, which are integrated into the surface of the ribs 4 only with a partial length of each individual fiber
In Fig. 2 ist der Querschnitt eines Keilnppenriemens mit Gundkorper 2, Decklage 1 und Zugtragerlage 3 dargestellt, der eine Polymer enthaltende, äußere Beschichtung 6 auf seinen Rippen 4 aufweist, in die die kurzen Aramidfasern 5 nur mit einer Teillange jeder einzelnen Faser eingebunden sind.2 shows the cross section of a V-belt with base body 2, top layer 1 and tension-bearing layer 3, which has a polymer-containing outer coating 6 on its ribs 4, in which the short aramid fibers 5 are only integrated with a partial length of each individual fiber.
Die in den Figuren 1 und 2 dargestellten Keilrippennemen weisen z. B. verwendet in Riementrieben zum Antrieb des Stromgenerators in Kraftfahrzeugen eine deutlich verminderte Gerauschentwicklung auf. The V-ribs shown in Figures 1 and 2 have z. B. used in belt drives to drive the power generator in motor vehicles on a significantly reduced noise.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Decklage Grundkörper1 top layer of base body
3 Zugträgerlage Rippen Aramidfasern Polymer enthaltende, äußere Beschichtung 3 tension member layer ribs aramid fibers polymer-containing outer coating

Claims

Patentansprüche claims
1 . Reibschlüssiger Treibriemen mit einem Grundkörper (2) und einer Decklage (1 ) aus Gummi oder gummiähnlichem Kunststoff, der eine in den Gummi oder den gummiähnlichen Kunststoff eingebettete Zugträgerlage (3) aufweist, dadurch gekennzeichnet, dass nur die Oberfläche oder ein Teil der Oberfläche des Treibriemens, bevorzugt der bewegungsübertragende Teil der Oberfläche, mit einem Beflockungsmaterial aus kurzen Aramidfasern (5) versehen ist, wobei ein Teil der Aramidfasern (5) nur mit einer Teillänge jeder einzelnen Faser in die Oberfläche eingebunden ist.1 . Frictional drive belt with a base body (2) and a cover layer (1) made of rubber or rubber-like plastic, which has a tension member layer (3) embedded in the rubber or rubber-like plastic, characterized in that only the surface or part of the surface of the drive belt , preferably the movement-transmitting part of the surface, is provided with a flocking material made of short aramid fibers (5), a part of the aramid fibers (5) being integrated into the surface only with a partial length of each individual fiber.
2. Reibschlüssiger Treibriemen nach Anspruch 1 , dadurch gekennzeichnet, dass die überwiegende Anzahl der Aramidfasern (5) nur mit einer Teillänge jeder einzelnen Faser in die Oberfläche eingebunden ist.2. Frictional drive belt according to claim 1, characterized in that the predominant number of aramid fibers (5) is only integrated into the surface with a partial length of each individual fiber.
3. Reibschlüssiger Treibriemen nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die einzelnen Aramidfasern (5) eine Länge von 0,1 bis 6 mm und einen Durchmesser von 5 bis 25 μm aufweisen.3. Frictional drive belt according to one of claims 1 or 2, characterized in that the individual aramid fibers (5) have a length of 0.1 to 6 mm and a diameter of 5 to 25 microns.
4. Reibschlüssiger Treibriemen nach zumindest einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Aramidfasern (5) mit einer antistatischen oder elektrisch leitfähigen Beschichtung versehen sind.4. Frictional drive belt according to at least one of claims 1 to 3, characterized in that the aramid fibers (5) are provided with an antistatic or electrically conductive coating.
5. Reibschlüssiger Treibriemen nach zumindest einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Aramidfasern (5) aus einem Copolymerisat aus im5. Frictional drive belt according to at least one of claims 1 to 4, characterized in that the aramid fibers (5) made of a copolymer of im
Wesentlichen Terephthalsäure und p-Phenylendiamin bestehen.There are essentially terephthalic acid and p-phenylenediamine.
6. Reibschlüssiger Treibriemen nach zumindest einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Aramidfasern (5) aus einem Copolymerisat aus im Wesentlichen Isophthalsäure und m-Phenylendiamin bestehen.6. Frictional drive belt according to at least one of claims 1 to 4, characterized in that the aramid fibers (5) consist of a copolymer of essentially isophthalic acid and m-phenylenediamine.
7. Reibschlüssiger Treibriemen nach zumindest einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Treibriemen oder Teile des Treibriemens eine Polymer enthaltende, äußere Beschichtung (6) aufweist bzw. aufweisen, die durch einen Vulkanisationsprozeß mit dem Gummi oder gummiähnlichen Kunststoff des Grundkörpers (2) und/oder der Deckiage (1 ) fest verbunden und/oder vernetzt ist, und die Aramidfasern (5) in diese Beschichtung (6) eingebunden sind.7. Frictional drive belt according to at least one of claims 1 to 6, characterized in that the drive belt or parts of the drive belt has or have an outer coating (6) containing polymer, which by a vulcanization process with the rubber or rubber-like plastic Base body (2) and / or the deckiage (1) is firmly connected and / or cross-linked, and the aramid fibers (5) are integrated in this coating (6).
8. Reibschlüssiger Treibriemen nach Anspruch 7, dadurch gekennzeichnet, dass die Polymer enthaltende, äußere Beschichtung (6) Fluorpolymere aufweist.8. Frictional drive belt according to claim 7, characterized in that the polymer-containing outer coating (6) comprises fluoropolymers.
9. Reibschlüssiger Treibriemen nach Anspruch 8, dadurch gekennzeichnet, dass das Fluorpolymer Polytetrafluorethylen ist.9. Frictional drive belt according to claim 8, characterized in that the fluoropolymer is polytetrafluoroethylene.
10. Reibschlüssiger Treibriemen nach Anspruch 8, dadurch gekennzeichnet, dass das Fluorpolymer ein Copolymerisat aus Ethylen und Tetrafluorethylen ist.10. Frictional drive belt according to claim 8, characterized in that the fluoropolymer is a copolymer of ethylene and tetrafluoroethylene.
11. Reibschlüssiger Treibriemen nach Anspruch 8, dadurch gekennzeichnet, dass das Fluorpolymer ein Terpolymerisat aus Tetrafluorethylen, Hexafluorpropylen und Vinylidenfluorid ist.11. Frictional drive belt according to claim 8, characterized in that the fluoropolymer is a terpolymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride.
12. Reibschlüssiger Treibriemen nach zumindest einem der Ansprüche 1 bis 11 , dadurch gekennzeichnet, dass der Treibriemen ein Keilrippenriemen ist, dessen Rippenoberfläche mit dem Beflockungsmaterial aus kurzen Aramidfasern (5) versehen ist. 12. Frictional drive belt according to at least one of claims 1 to 11, characterized in that the drive belt is a V-ribbed belt, the rib surface of which is provided with the flocking material made of short aramid fibers (5).
EP01938071A 2000-04-03 2001-03-30 Frictionally engaged driving belt Ceased EP1272777A1 (en)

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US20030139242A1 (en) 2003-07-24
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US7128674B2 (en) 2006-10-31
DE10016351A1 (en) 2001-10-11

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