WO2019072956A1 - Courroie de transmission de force à au moins trois couches, dont une couche tampon expansée - Google Patents

Courroie de transmission de force à au moins trois couches, dont une couche tampon expansée Download PDF

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Publication number
WO2019072956A1
WO2019072956A1 PCT/EP2018/077708 EP2018077708W WO2019072956A1 WO 2019072956 A1 WO2019072956 A1 WO 2019072956A1 EP 2018077708 W EP2018077708 W EP 2018077708W WO 2019072956 A1 WO2019072956 A1 WO 2019072956A1
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WO
WIPO (PCT)
Prior art keywords
layer
belt
foamed
layers
power transmission
Prior art date
Application number
PCT/EP2018/077708
Other languages
German (de)
English (en)
Inventor
Marlene Ohlhäuser
Florian LOTZ
Willi Ollenborger
Original Assignee
Arntz Beteiligungs Gmbh & Co. Kg
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 Arntz Beteiligungs Gmbh & Co. Kg filed Critical Arntz Beteiligungs Gmbh & Co. Kg
Priority to EP18789031.4A priority Critical patent/EP3695139A1/fr
Publication of WO2019072956A1 publication Critical patent/WO2019072956A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
    • F16G1/10—Driving-belts made of rubber with reinforcement bonded by the rubber with textile reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • B29D29/10—Driving belts having wedge-shaped cross-section
    • 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
    • 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
    • F16G1/14—Driving-belts made of plastics
    • F16G1/16—Driving-belts made of plastics with reinforcement bonded by the plastic material
    • 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
    • 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
    • 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 power transmission belt having a base body which is formed of several layers and has at least three layers, each consisting of an elastomeric or thermoplastic material, as well as a plurality of methods for its production.
  • Power transmission belts are increasingly being used as drive belts on engines having rotational nonuniformity. As a result, the belt wears faster, in particular due to abrasion or cord layer separation, and causes noises during operation.
  • a Cordlagentrennung that leads to the failure of the belt usually be avoided by trying to elastic and firmly bind the belt material to the rigid cord.
  • adhesion promoters are used as Cordschlichte or adhesive, adhesive or reactive Cordeinbettungsmassen.
  • the measures taken to date on the belt surface are symptomatic and do not address a causal elimination of the drawbacks that goes to the roots of the problem.
  • the sought-after belt should be able to be used in drives with high speed and torque pulsation.
  • the invention is therefore based on the object to avoid the above-mentioned, known from the prior art disadvantages and to create drive belt with low-vibration running and long life.
  • a power transmission belt having a base body which is multilayered and has at least three layers, each consisting of an elastomeric or thermoplastic material, achieved in that at least one of the layers within the body is a foamed layer, wherein the one or each foamed layer is internal with respect to the sequence of layers in the main body, that is to say that the or at least one foamed layer is arranged so that it does not have a flat outer side which comes into contact with a pulley or a roller.
  • a “foamed layer” is meant a layer in the sense of a foam.
  • the foamed layer consists of a layer of the base body of an elastomeric or thermoplastic material containing pores Under pores gas- or fluid-filled cavities within the material of
  • Open-pore foams have pores which are partly interconnected and may be exposed at the surface or interface of the layer, or are not self-contained. Such foams often result from the use of physical or chemical blowing agents in the manufacture of the layer. Closed-cell foams have pores that are self-contained, such foams are often obtained through the use of expandable or pre-expanded hollow microspheres. Hollow spheres suitable for foam production, also referred to as "microspheres", are commercially available.
  • the "foamed layers” in the sense of this invention may also be referred to as microporous layers and show a - preferably finely structured - cellular microstructure.
  • the foamed or microporous layer according to this invention namely internal in a power transmission belt, is preferably fiber-free and free of coarse aggregates.
  • the meaning of the various layers with regard to the construction process of the various layers and the individual zones of a power transmission belt in the context of this invention will be explained in more detail in the introduction
  • the belt has a body of elastomeric or thermoplastic material, which is composed of several layers.
  • the main body preferably consists of one or more different elastomers. Suitable here are all common belt materials, preferably natural or synthetic rubbers, in particular M elastomers and R elastomers, in particular EPM, EPDM, nitrile rubbers, halogen rubbers, SBS, SEBS, elastomeric polyurethanes.
  • the base bodies contemplated herein may be constructed entirely of thermoplastic materials, such as PVC, polyesters, thermoplastic elastomers, such as, preferably, thermoplastic polyurethanes. If the main body of the belt consists of a uniform, eg elastomeric material, it may be of its basic form - without consideration of external coatings or supports, textile coverings and possibly embedded tensile carriers - single-layered. In a V-belt this body is called the core.
  • the internal foamed layer according to the invention is a corresponding Three-layer belt, because the foamed layer is enclosed on both sides by a layer or position of the base body.
  • the foamed layer according to the invention represents an additional layer lying inside the main body, which gives the belt special mechanical properties - as will be explained in more detail below - and which effects a type of mechanical damping or buffering.
  • the "foamed layer” according to the invention is therefore also referred to herein as a "buffer layer".
  • the embedded in the belt foamed or microporous layer according to the invention leads to a vibration poorer run, especially in a drive belt, which is to be used for use at high speed, under varying dynamic load and / or Drehun- uniformity.
  • the foamed layer or buffer layer according to the invention is also open at the side, but it should not be superficially arranged Flank-open belts in which the individual layers extend over the entire width and open at the flanks arise, for example, when a sleeve-shaped intermediate body of cast or wound layers is formed on a machine core and then cut into individual belts
  • the foamed layer is entirely inside and completely surrounded by other materials
  • the layers of the belt including the foamed layer (s) according to the invention extend in the belt longitudinal direction, the running direction, throughout the entire length e of the belt or body, so that each layer forms an annular band closed in an endless belt.
  • the layers preferably extend in the transverse direction over the entire width of the main body.
  • prefabricated basic bodies can be encased with at least one elastomeric layer or overlay.
  • elastomeric body support which may be a (rubberized) textile cover, for example, over the entire width of the Base body run.
  • the height of the layers is either uniform or variable in the longitudinal or transverse direction.
  • the sum of the height of the individual layers forms the belt height.
  • Longitudinal tension members may be embedded in the main body of the belt.
  • the tension members can also be replaced by a flat tensile reinforcement layer, for example a woven fabric.
  • String-shaped tension members wound close to each other, being in-plane and forming a layer may also be referred to as "tension-carrier layers.”
  • Strand-shaped tension members are often embedded in a ply of a particular material, which is also referred to as a ply-wrap ply.
  • the tension members are located in the base body between a lying on the power transmission side of the belt power transmission or compression zone and the power transmission side facing away cover or supine.
  • the one foamed layer or at least one of a plurality of foamed layers is located on the power transmission side of the belt, that is, on the belt side, which in use is in contact with a pulley or pulley , below an optionally existing Switzerlandierilage.
  • a foamed layer is located between a tension carrier layer and the power transmission zone, which is formed on the base body below the tension carrier layer and has a surface in contact with force transmitting parts of a drive system.
  • a foamed layer or buffer layer is located immediately under an outer elastomeric layer on the power transmission side of the belt.
  • the outer elastomer layer is preferably a thin cover layer which, inter alia, has a suitable abrasion resistance.
  • the belt as a whole shows a very good power transmission behavior without or with greatly reduced slip behavior, that is, with the greatest possible avoidance of slip-stick effects
  • the layer Due to its finely structured cellular microstructure, the layer has a vibration-absorbing effect. This leads in particular to drive belts used in drive systems with rotational nonuniformity to a reduction in wear and noise. Disturbing torsional vibrations are suppressed. Failure frequency and tearing tendency are also associated with it; the life of the belt increases.
  • the foamed layer or foamed layers is located on the side facing away from the power transmission side of the belt, i. the belt back side.
  • the buffer layer which is compressible due to its microcellular foam structure and compensates for mechanical stresses, produces optimized entry and exit angles for pulley and back roller drives and for short runs. This results in a particularly good noise and abrasion reduction.
  • a foamed layer on the power transmission side and a foamed layer on the belt back side below a cover layer and / or cover there are a foamed layer on the power transmission side and a foamed layer on the belt back side below a cover layer and / or cover.
  • an additional foamed layer may be present instead of a covering layer, textile covering or flocking.
  • This additional layer is not the actual buffer layer according to the invention, which must always be present within the base body covered by further layers for the mechanical effect according to the invention, but rather an additional covering layer, which can also be foamed only in a special case.
  • the foamed layer or one of the foamed layers adjoins a tension carrier layer or a tension carrier embedding layer.
  • the advantage of this embodiment is in particular to provide a mechanical buffering of the force-transmitting belt areas, which are in contact with rollers or discs, with respect to the tension members, if the mechanical load, for example by rotational irregularities, or by other use-related loads would otherwise be high. This in turn increases the life of the belt.
  • the foamed layer - or one of the foamed layers - surrounds the individual, coated with a coating Buchieri.
  • the effect corresponds to that described above, i. a decoupling by the motor drive vibration loaded rigid tension member from the power transmission range of the elastic belt. It is important that the foamed layer of the material of the tension members themselves, the z. As steel or high-performance polymer fibers such as aramid, completely separated and spaced by the tensile carrier coating material.
  • Coated and fully coated tensile carriers are commercially available.
  • the sheathing, with which the tensile carrier strands are generally additionally impregnated, can consist, for example, of an adhesion-promoting plastic, a resin, a special elastomer mixture or the base body elastomer or the associated unvulcanized rubber intended for the belt in which the coated tension member is to be used ,
  • the main body of the belt of this invention is a belt core (V-belt), a ribbed body (V-ribbed belt) or a toothed body or toothed belt main body (timing belt).
  • the power transmission belt according to the invention is accordingly preferably a V-belt, a V-ribbed belt, a power belt or a toothed belt.
  • the main body is of multilayered construction and comprises at least one foamed layer, a mechanically acting "buffer layer", inside the layer sequence of the main body
  • the foamed layer preferably has pores on the micrometer scale, namely with average diameters of the individual pores between 1 ⁇ and 200 ⁇ .
  • the foamed layer contains up to 50 vol .-% air or (propellant) gas or expanded micro hollow spherical fluid.
  • the foamed layer preferably contains at least 10% by volume, more preferably at least 20% by volume, of air, propellant gas or expanded microballoon fluid.
  • the belt with the foamed layer can be produced in various ways.
  • the power transmission belt according to the invention which has exactly one or at least one foamed layer, is obtainable by a method in which expandable hollow microspheres or a chemical or physical blowing agent is mixed into a starting material for the foamed layer, wherein the Method comprises at least one heating step at a temperature at which the layer is foamed.
  • the heating step in which the foaming takes place may preferably be the melting of a thermoplastic material or a vulcanization step for an elastomeric material of the relevant layer.
  • the thermoplastic starting material for the foamed layer may be a master blend of expandable hollow spheres or commercially available blowing agent additives.
  • the heating step in which the foaming of the layer takes place can then preferably be a vulcanization step after the tube belt assembly.
  • the heating step may preferably take place in the course of an embossing process (belt molding process).
  • a vulcanization is triggered and run in or after the forming step.
  • a second embodiment of the power transmission belt according to the invention is obtainable by a method in which already expanded (pre-expanded) or partially expanded hollow microspheres are mixed in a starting material for the foamed layer and the belt is then constructed and completed in a conventional manner.
  • the solution of the object of the invention further comprises a method for producing the power transmission belt according to the invention, wherein the belt is constructed using prefabricated layers, wherein for the foamed layer, a layer of a foamed elastomer or a foamed thermoplastic material is used.
  • FIG. 1 is a schematic representation of a first exemplary embodiment in the form of a V-ribbed belt in a cross-sectional view with a foamed buffer layer extending into the individual ribs;
  • Fig. 2 is a schematic representation of a second embodiment in
  • Figure 3 is a schematic representation of a third embodiment in the form of a V-ribbed belt in cross-sectional view with a foamed buffer layer on the compression side below the Glaszanlage.
  • 4 shows a schematic representation of a fourth embodiment in the form of a V-ribbed belt in cross-sectional view with a foamed buffer layer on the back of the belt;
  • Fig. 5 is a schematic representation of a fifth embodiment in
  • Figure 6 is a schematic representation of a sixth embodiment with two foamed buffer layers.
  • Fig. 7 shows a diagram for the dynamic mixing test, tan5 plotted against the strain amplitude [%];
  • Fig. 8 shows a diagram for the dynamic mixing test, dynamic stress [MPa] plotted against the elongation [%];
  • FIG. 9 shows a test setup for belt testing.
  • Figures 1 to 6 show schematic cross-sectional views, at which the layer or layer structure of the embodiments will be explained. Shown are in each case embodiments for V-ribbed belts (ribbed belts) with 6 ribs. The number of ribs can just as well be chosen differently, the number of ribs does not matter in the invention.
  • the belt structures can be transferred to other types of belt, for which no embodiments are shown here.
  • Figures 1 to 6 can be easily read on V-belts - the number of ribs would then be 1 and, if necessary, a sheathing is available.
  • the order of the layers, as shown here, can also be transferred to toothed belts.
  • Figures 1 to 6 show cross-sections of the end products, ie the belt with foamed buffer layers.
  • the corresponding layers would be thinner and, if necessary, shaped differently (in particular in the case of FIG. 1, layer 6 would be flat there before molding).
  • Figure 1 shows a generally designated 10 power transmission belt in the form of a V-ribbed belt in cross-section - drawn purely schematically and not to scale.
  • a main body 1_ extends almost over the entire height of the belt. It is a rib body on which individual ribs 20 - in this example six ribs - are formed.
  • the outer regions of the ribs 20 form a force transmission zone 2, via which forces transmitted by a pulley, not shown, are introduced into the belt 10. The introduction of force occurs primarily over the flanks of the ribs 20.
  • the ribs 20 are part of the substructure_3 on the compression side of the belt; the power transmission zone 2 is an area, a part or a zone of this substructure 3.
  • the substructure 3 is "below” the tension members 70, ie on the pulley or power transmission side, on the opposite side, "above” the tension members 70 is a Cover layer 4 of the strap back, which is also part of the body.
  • the belt back here has an outer belt backing layer 5 in the form of a fabric overlay or alternatively a flocking; This is not considered part of the body.
  • a foamed layer 6 can be embedded as a mechanical buffer layer in the sense of this invention on the force transmission side, within the substructure 3 and "covered” by an outer elastomer layer 30 for the external force transmission zone 2.
  • the buffer layer 6 extends In this embodiment, into the interior of the individual ribs 2 and generates a very effective damping zone between the Glasanilage_7 and the ribs 20 with the power transmission zone 2.
  • the foamed layer 6 does not reach here directly to the tension members 70 zoom, as usual in
  • the outer elastomer layer 30 and the cover layer 4 in this exemplary embodiment consist of the same elastomeric material into which the tensile carriers 70 are embedded directly or mediated via a sizing or a tensile carrier coating, as usual.
  • Figure 2 again shows an embodiment of a six-ribbed V-ribbed belt.
  • the foamed layer 6 is similar to Figure 1 on the power transmission side of the belt in the base 3 arranged, but now located closer to the rib surface.
  • the foamed layer 6 is here directly below a thin outer elastomeric layer 30 and causes a kind of "floating" underlay of the external power transmission area.
  • Figure 3 shows an example corresponding to the basic structure as the first two figures, wherein the foamed buffer layer 6 now in the upper region of the substructure 3, immediately below a zone around the Glaszanlage 7, i. with a slight distance from the individual tension members 70, is arranged.
  • Figure 4 again shows a corresponding V-ribbed belt, in which the buffer layer 6, however, is integrated in the cover layer 4 of the belt back.
  • the foamed layer 6 divides the cover layer 4 as compared to the corresponding cover layers from the previous examples approximately at mid-height. As already described in the general part, this serves in particular for short runs between the pulley and back roller an optimized entry and exit angle and leads to significant noise reduction in such drive assemblies.
  • Figure 5 shows a corresponding V-ribbed belt, which in its basic structure is similar to the examples from the previously discussed figures.
  • the foamed layer surrounds the individual tensile carriers 70, which are each coated or surrounded by their own tensile carrier coating within the sheathing with the buffer layer 6.
  • the tensile carrier coating may be present around the individual tensile strand strands, ie within a twine, and additionally on the outside around the entire tensile carrier 70, or it may be present exclusively around the individual tensile carriers 70 and enclose them.
  • FIG. 6 shows a corresponding V-ribbed rime, which, however, has two foamed layers 6 in this exemplary embodiment.
  • a second foamed layer 6 is formed in addition to the integrated into the power transmission zone 2, located just below the rib surface buffer layer corresponding to the foamed layer 6 of Figure 2, in addition to the belt back side, that is embedded in the cover layer 4, a second foamed layer 6 is formed.
  • the layer arranged on the back side has already been explained above with reference to FIG.
  • test panels made of foamed materials and test belts with foamed layers were produced.
  • Rubber Blends for Test Belts A belt elastomer masterbatch was used which was blended once without additives (Test Mixture 1, Reference Mixture), with expandable hollow microspheres (Test Mixture 2), and finally with a commercially available chemical foaming agent of mineral oil blended hydrazide (Test Mixture 3) , In order to be able to determine the influence of the foaming agent exactly, exactly the same basic mixture was used in each case. Various tests were performed on the rubber composition and on the vulcanized foamed elastomers.
  • Mixture 1 The base mixture used was a fiber-free conventional EPDM mixture without micropore-producing additives.
  • the base mixture used consists of 100 phr of an EPDM mixture, about 50 phr of carbon black, each under 5 phr of an antioxidant, a plasticizer, a peroxide crosslinker and stearic acid. Further, zinc and magnesium oxide and a zinc dimethacrylate-based ionic activator were added. These Rubber base mixture was prepared (blended and kneaded) in a conventional manner, which also applies to the mixtures with propellant indicated below; Special conditions were also not required for the blowing agent-containing mixtures.
  • Mixture 2 fiber-free EPDM base mixture, as under 1, with 20 phr expandable hollow microspheres Expancel®, 18-24 ⁇ , isopentane-filled copolymer shells.
  • EPDM base fiber-free base blend as under 1, with 15 phr Tracel® OBSH 75 KP (oxybisbenzenesulfonyl hydrazide, 75%).
  • the propellant-foamed mixture 3 has a markedly reduced hardness in comparison to the hollow-foam-foamed mixture 2. This is a good prerequisite for a layer which is intended to absorb and buffer vibrations.
  • the diagram of Figure 7 shows for the test mixtures compared here that the tan5 is strongly dependent on the strain amplitude and can be adjusted by the type of foaming reagent / micropores and their amount.
  • For the tervall 0-2% dynamic strain shows Test Mix 2 the lower energy dissipation. In the range of a dynamic elongation of 3-5%, it can be seen that in test mixture 2, the mixture with the micropores of expanded hollow spheres, the damping effect is significantly increased, at the expense of energy dissipation.
  • Test mixture 3 shows above a dynamic elongation of 3% a reduced energy loss in comparison to the other two mixtures, including the reference mixture, test mixture 1.
  • the diagram in Figure 8 shows that the material after test mixture 3 exhibits the least resistance over a given elongation over the entire measuring range.
  • the vulcanizable test mixtures were, as is usual for belt elastomers, placed in an internal mixer where they were thoroughly mixed and kneaded. This is done for example by a stamp mixer.
  • the propellant was already incorporated here for the record belt in the propellant mixture.
  • the vulcanizable, thus obtained, d. H. here radically crosslinkable mixture is processed as usual, so usually rolled, glued with Switzerlandamide and spine or pressed, shaped and vulcanized in the heat (crosslinked).
  • the belt shape can be obtained by hot pressing, i. H. Embossing can be obtained.
  • Such processing methods are known in the art as such and need not be described in detail here. The exact procedure depends on the respectively desired belt structure or the embodiment.
  • the core layer inside the foamed layer first as a non-foamed plate (1, 4 mm), but containing the propellant, with another layer, the core outer layer (0.5 mm), and then as mentioned above was combined with the other usual layers and molded and vulcanized.
  • the usual process conditions had not to be specially adapted because the decomposition temperature of the blowing agent and thus the beginning of the foaming is just below the actual vulcanization temperature. It could the usual vulcanization process are used in which the porous belt structure has been fixed.
  • the internal pores are i. A. larger, outward towards the rib sides, the pores are smaller, which is adjusted by the relative pressure distribution during vulcanization.
  • test mixture 3 ie when foaming with chemical blowing agent, the pore diameters are subject to greater scattering than the pore diameters achieved with hollow microspheres.
  • the hollow microsphere foam is closed-cell and solid; which foaming process is chosen depends on the properties desired in the belt.
  • the test is carried out on a test rig as shown in Figure 9.
  • the serpentine drive according to Fig. 9 has the drive pulley d1 (inside), six further pulleys d3, d5, d7, d8, d10 and d12 and six back rollers / pulleys d2, d4, d6, d9, d1 1 and d13.
  • the belt is heavily stressed by many bending changes in the core area.
  • the running time is measured in hours (h), with a running time of> 100 h as the minimum running time for a serviceable belt.

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

Abstract

L'invention concerne une courroie de transmission de force (10) comportant un corps de base (1) qui est constitué de plusieurs couches et présente au moins trois couches (3, 30 ; 4 ; 5 ; 6) qui sont chacune composées d'un matériau élastomère ou thermoplastique, caractérisée en ce qu'au moins une des couches à l'intérieur du corps de base (1) est une couche expansée (6), la ou chaque couche expansée (6) étant placée à l'intérieur par rapport à la succession des couches dans le corps de base (1).
PCT/EP2018/077708 2017-10-12 2018-10-11 Courroie de transmission de force à au moins trois couches, dont une couche tampon expansée WO2019072956A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18789031.4A EP3695139A1 (fr) 2017-10-12 2018-10-11 Courroie de transmission de force à au moins trois couches, dont une couche tampon expansée

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017123722.4A DE102017123722B4 (de) 2017-10-12 2017-10-12 Wenigstens dreischichtiger Kraftübertragungsriemen mit geschäumter Pufferschicht und Verfahren zur Herstellung eines solchen Kraftübertragungsriemens
DE102017123722.4 2017-10-12

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WO2019072956A1 true WO2019072956A1 (fr) 2019-04-18

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DE (1) DE102017123722B4 (fr)
WO (1) WO2019072956A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022146989A1 (fr) * 2020-12-28 2022-07-07 Gates Corporation Courroies de transmission comprenant des couches de sous-câble en mousse et leurs procédés de fabrication

Citations (3)

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