EP2449285A1

EP2449285A1 - Elastic drive belt, in particular ribbed v-belt, having reduced loss of tension

Info

Publication number: EP2449285A1
Application number: EP10723575A
Authority: EP
Inventors: Henning Kanzow; Falk Lorenz; Tim Fiss
Original assignee: ContiTech Antriebssysteme GmbH
Current assignee: ContiTech Antriebssysteme GmbH
Priority date: 2009-07-01
Filing date: 2010-05-27
Publication date: 2012-05-09
Also published as: CN102472364A; BRPI1015925A2; DE102009026077A1; WO2011000637A1; US20120115658A1

Abstract

The invention relates to a drive belt (1) having a main body made of a polymeric material with elastic properties, comprising a cover layer (2) as the belt back and a substructure (5) with a power transmission zone (8). At least one traction cord (4) in cord design is also embedded in the drive belt, wherein three traction strand variations are described in more detail in this respect. According to the teaching of the invention, the traction cord (4) is completely or partially made of a polyethylene terephthalate (PET), wherein the PET is made of a yarn in conjunction with the following yarn and cord parameters: a cord length weight of ≤ 3600 dtex; a heat shrinking path of the yarn ≤ 5% after 2 minutes at 177°C and at a pretress of 0.0005 N/dtex; a corresponding force of the yarn of ≥ 3.4 cN/dtex at an elongation of 5% at 25°C and at a prestress of 0.0005 N/dtex; and a heat shrinking force of the cord of ≥ 0.12 cN/dtex in hot air at 160°C after 10 minutes and at a prestress of 0.005 N/dtex. The drive belt (1) is particularly designed as a ribbed v-belt and preferably used in a v-belt drive without automatic tensioning system.

Description

description

Elastic drive belt, in particular V-ribbed belt, with reduced tension loss

The invention relates to a drive belt with a base body made of a polymeric material having elastic properties, comprising a cover layer as a belt back and a substructure with a power transmission zone, wherein

- According to a first variant in the body at least one tensile strand in

Cord construction is embedded or

- According to a second variant between the top layer and the base a

Interposed layer of a polymeric material having elastic properties is arranged, wherein in the intermediate layer at least one tensile strand in

Cord construction is embedded; or

- According to a third variant, at least one cord in Cordkonstruktion a

Cordlage forms, between the Cordlage and the cover layer and / or between the Cordlage and the base an intermediate layer of a polymeric material having elastic properties is arranged.

Drive belts, also referred to as power transmission belts and in

Functional state are endlessly closed, can be used as flat belts, V-belts,

Be formed V-ribbed belt, timing belt and clutch belt. Of particular importance is the V-ribbed belt, reference being made in this regard to the following patent literature. DE 38 23 157 A1

DE 100 16 351 A1

DE 10 2006 007 509 A1

DE 10 2007 044 436 Al

EP 0 590 423 A2

EP 0 737 228 Bl

EP 0 831 247 Bl

EP 0 866 834 Bl

EP 1 108 750 Al

EP 1 129 308 Bl

US 3,981,206

The elasticity, including the bending elasticity of a drive belt is achieved in that the base body and thus the cover layer and the base of a polymeric material with elastic properties, in which case the two groups of materials elastomers and thermoplastic elastomers are to be mentioned. Of particular importance are elastomers based on a vulcanized

Rubber mixture. The drive belt is provided with at least one embedded pull cord according to one of the three variants mentioned above, wherein in particular a plurality of tensile strands form a reinforcement layer or Zugträgerlage. Of particular importance in this case is a tension cord in cord construction, wherein in this respect there are different material concepts according to the prior art. The main types of materials are now presented in more detail below.

- Polyester tension cord (PES)

In automotive applications, V-ribbed belts (CRR) with PES tensile strand are most commonly used. Typical cord constructions with PES are

1100 dtex x2x3 and 1100 dtex x3x3. Such a cord with the frequent However, used normal type yarns shows no advantageous elongation behavior. The PES cords "crawl", which means that they stretch plastically, often compensated by an automatic tensioning system in the KRR engine, and in recent years, engine manufacturers have been trying harder and harder, if possible In a KRR drive without an automatic tensioning system, however, the elongation of the belt causes a drop in the operating voltage, which has a very negative effect on the drive performance of the belt and its durability

Tensioning of the belt, a process, what usually a

Fachwerkstatt must be visited. Moreover, in a KRR drive with exclusively fixed rollers ("rigid drive"), simple assembly is scarcely possible because the mounting stresses occurring when the belt "chokes" over the pulleys become too high due to the excessive ExA value (longitudinal rigidity) of the belt are. Pull cord made of polyamide (PA)

In automotive applications without an automatic tensioning system, therefore, KR tensile cord pulls made of PA, in particular in the form of PA6.6 and P A4.6, are usually used, which are characterized by a lower modulus. These lose in belt drives without tensioning system with a high number of roles and at a high power transfer but also relatively quickly the necessary tension. With a significant increase in the bias can be remedied here. But the associated bearing loads are usually not acceptable in practice. Another problem with a PA tensile strand is too high a bearing shrinkage. Up to now, attempts have been made to reduce these by a tension-free assembly of the belts (EP 0 831 247 B1). In practice, however, there are always problems with the mountability of such elastic drive belt, in particular V-ribbed belts, as the belts shorten too much during a long storage time, as occurs especially in replacement market. - Tensile strand of polyetheretherketone (PEEK)

As part of a recent development, it is proposed, in particular

V-ribbed belt equipped with PEEK tension cord. In addition to the Cordkonstruktion here in particular a multi-parliamentary construction is used. With regard to related textile technological details, reference is made to the published patent application DE 10 2007 044 436 A1. Comparative tests between a PA6.6 tensile strand and a PEEK tensile strand have shown that in drive belts with a PEEK tensile strand a reduced stress loss can be achieved with significantly reduced bearing shrinkage. The term and thus the

Lifespan of a drive belt with PEEK tensile strand are therefore significantly greater. The disadvantage here, however, that the textile material PEEK is much more expensive than polyamide or polyester, so that the limits of efficiency are shown here.

The above-mentioned tensile-train materials collectively disclose common problems in the manufacture of low-modulus drive belts with a low-modulus cord as a tensile strand, coupled with the achievement of a low

Voltage drop and low shrinkage and a high power transmission capability.

The other otherwise known material alternatives, namely steel, aramid,

Glass fibers and carbon fibers are unsuitable for elastic KRR because of their high modulus character and low stretchability.

As a rule, the drive belts can not be made arbitrarily wide. In order to increase the power transmission per belt width, so an improvement in the power transfer force of a pull string itself is required. In the background of the overall tensile problem described here, the object of the invention is a low-modulus drive belt, in particular a Ribbed belt to provide using a low modulus cord, associated with an increase in life in terms of a reduced

Loss of tension and additionally with the objective of a low shrinkage. In addition, the associated Zugstrangkonzept should be economical.

This object is achieved in that the tensile strand consists wholly or partly of a polyethylene terephthalate (PET), wherein the PET is formed from a yarn, associated with the following yarn and cord parameters: - a cord length weight <3600 dtex (feature group I);

A heat shrinkage of the yarn <5% after 2 minutes at 177 ° C and a bias of 0.0005 N / dtex (feature group II); - a corresponding force of the yarn> 3.4 cN / dtex at an elongation of 5% at 25 ° C and a bias of 0.0005 N / dtex (feature group III) and

- a heat shrinkage force of Cordes> 0.12 cN / dtex in hot air at 160 ° C after

10 minutes and at a bias of 0.0005 N / dtex (feature group IV).

The yarn parameters (feature groups II and III) refer exclusively to the PET as the raw yarn, regardless of whether the tow strand is wholly or partially made of PET. The Cord parameters (feature groups I and IV) refer both to a tensile strand formed exclusively of PET and to a tensile strand in the form of a hybrid system, which will be presented in more detail.

The raw yarn used here for the cord according to feature groups II and III is an HMLS PET yarn (HMLS = high modulus, low shrinkage). The relevant

Use for a low modulus cord is new and was not expected in terms of the desired effect effect. With regard to the PET yarn, the following yarn parameters are suitably used under the above conditions:

A heat shrinkage path of the yarn <4%;

A corresponding force of the yarn> 3.8 cN / dtex.

A test series has shown that for the production of the cord a raw yarn is particularly advantageous, which shows a heat shrinkage of 3.9% at 177 ° C and a corresponding force of 4.0 cN / dtex at 5% elongation at 25 ° C. having.

The advantageous cord parameters are:

A cord length weight of 2000 dtex to 3500 dtex;

A heat shrinkage force of the cord> 0.18 cN / dtex;

A strand rotation> 180 tpm, in particular> 200 tpm, in particular again from 200 tpm to 220 tpm;

- a cord construction from 900 dtex to 1300 dtex xlx3 or 900 dtex up to

1300 dtex xlx2, in particular 1100 dtex xlx3 or 1100 dtex xlx2;

- A cord rotation <160 tpm, in particular <135, in particular again of

90 tpm to 135 tpm.

The following explanations are to be given with regard to some textile technological terms used here: Under the corresponding force of the yarn according to feature group III, the

Force to be understood in correspondence to the elongation of 5% at 25 ° C. she may also be referred to as tensile or tensile loading, the term "tensile stress" being most commonly used.

- The corresponding force according to feature group III as well as the

Cord shrinkage force according to feature group IV include the respective force per

Cord length weight with the dimension cN / dtex. The "c" means "centi", ie 1/100.

- The abbreviation "tpm" means "turns per meter" and is a typical unit in textile technology in all kinds of turns.

- In cord design, the length weight of the strands is as in the

Textile technology usually specified as nominal fineness. This is the nominal

Length weight (manufacturer) of the raw yarn used for the production of the cord (compare DIN 53830-3). Because of the rotations and the stretching, the actual length weight (actual fineness) may deviate from it.

- The Cordlängengewicht is the Istfeinheit (see DIN 53830-3) of the textile portion of the Cordes (adhesive layers).

A series of tests has given values of 0.18 cN / dtex (corresponding to mean extension of the cord in cord production) to 0.37 cN / dtex (corresponds to high draw of the cord in cord production) with regard to the heat shrinkage force of the cord.

Of particular importance is when the tow strand is completely made of a PET since this gives the best results.

However, it is also possible that the tensile strand partially consists of PET, namely in a quantity majority of PET. The PET can here with a polyamide (PA), polyimide (PI), aramid, polyvinyl acetal (PVA), polyester (PES), polyetheretherketone (PEEK) or a polyethylene-2,6-naphthalate (PEN) or in a combination of the aforementioned materials. With such textile hybrid materials, for example, the adhesion of the PET to the surrounding polymer material can be improved, in particular a PET / P A hybrid system being mentioned, since PA is particularly good

is liable to be activated. The PET content within a tensile strand is

55 wt .-% to 95 wt .-%, in particular 75 wt .-% to 95 wt .-%. It is important when using such hybrid concepts that compared to a tensile strand, the

is made exclusively of PET, no deterioration of the above-mentioned cord parameters occurs, at least in view of the cord length weight (feature group I) and the heat shrinkage force of the cord (feature group IV).

Further advantageous design variants of the drive belt according to the invention are presented in more detail in the description of the figures. The invention will now be explained by means of exemplary embodiments with reference to schematic drawings. Show it:

Fig. 1 shows a cross section of a V-ribbed belt in two versions

(Sections A and B);

Fig. 2 shows another embodiment of a V-ribbed belt in three-dimensional

Detailed representation;

Fig. 3, the Trumkraftverhalten a V-ribbed belt with different

Drawstrings based on a diagram.

1 shows a drive belt 1 in the form of a V-ribbed belt with a cover layer 2 as belt back, a single-layer reinforcement layer 3 with longitudinally extending tension strands 4 and with a substructure 5. The substructure has a V-rib structure formed by ribs 6 and grooves 7 The substructure comprises the power transmission zone 8. The cover layer 2 and the substructure 5 form as a whole the main body of a polymeric material having elastic properties, in particular in the form of a vulcanized rubber mixture containing at least one rubber component and Mischingingredienzien. The rubber component used is in particular an ethylene-propylene rubber (EPM), an ethylene-propylene-diene rubber (EPDM),

Hydrogenated nitrile rubber (HNBR), chloroprene rubber (CR), fluoro rubber (FKM), natural rubber (NR), styrene-butadiene rubber (SBR) or butadiene rubber (BR) are used, un-cut or with at least another

Rubber component, in particular with one of the aforementioned types of rubber, blended, for example in the form of an EPM / EPDM or SBR / BR blend. Of particular importance is EPM or EPDM or an EPM / EPDM blend. The mixture ingredients comprise at least one crosslinker or a

Crosslinking system (crosslinking agent and accelerator). Other mixing ingredients are usually still a filler and / or a processing aid and / or a

Plasticizer and / or an aging inhibitor and optionally further

Additives, for example fibers and color pigments. In this regard, reference is made to the general state of rubber mixing technology. The preferred incorporation of fibers in the rubber mixture will be discussed in more detail.

The tension cords 4 are embedded here without intermediate layer in the body. Everyone

Pull cord in Cordkonstruktion consists primarily of one

Polyethylene terephthalate (PET). According to a further variant, the PET may also be mixed with at least one further material, for example with a polyamide (PA), wherein in such a hybrid concept the PET has the majority of the quantity.

Each tensile strand 4 may additionally be equipped with an adhesive layer, the

for example, a resorcinol-formaldehyde latex (RFL). With regard to such or similar detention concepts, reference is made in particular to the published patent application

DE 10 2007 044 436 Al referenced, in connection with the

Tensile material polyetheretherketone (PEEK). The drive belt 1 is provided within its power transmission zone 8 with a coating 9 or 10, in the form of a flocking (section A), for example with a cotton or aramid flock according to DE 38 23 157 Al and DE 100 16 351 Al, or Form of a textile cover according to DE 10 2006 007 509 Al. Of particular importance are textile supports, in particular again in the form of a woven, knitted or knitted fabric. In a V-ribbed belt, the textile support is preferably a knitted or knitted fabric. With such a coating, a combination of wear protection and noise insulation is achieved.

The coating may be for the purpose of fulfilling the additional criterion of

Media resistance, in particular from the point of oil resistance, at the same time good lubricity be a fluoroplastic, which is in particular polytetrafluoroethylene (PTFE) and / or polyvinyl fluoride (PVF) and / or polyvinylidene fluoride (PVDF). Of special preference is PTFE. According to a more recent development, the fluoroplastic can consist of a film, in particular a PTFE film, or of a film composite, in particular of a PTFE / PA film, the PTFE forming the direct upper layer in the case of a film composite (DE 10 2008 012 044.8). A preferred alternative to this is to impregnate or seal a textile overlay with a fluoroplastic. The additional measure of the coating, which can also be applied to the cover layer 2 (exemplary embodiment according to FIG. 2), leads, in conjunction with the novel tension cord design, to a long service life of the drive belt.

FIG. 2 now shows a further drive belt 11, likewise in the form of a V-ribbed belt, which comprises a cover layer 12, a single-layer reinforcement layer 13 and a substructure 16 with a V-ribbed zone 19 formed by ribs 20 and grooves 21. The reinforcement layer is also formed here of individual tensile cords 14, which consist entirely or partially of PET. In this regard, reference is made to the PET textile technology already presented in more detail above. The reinforcement layer 13 and the tension cords 14 are completely surrounded by an embedding mixture, which forms the intermediate layer 15, so that in this way an effective overall composite of cover layer 12, reinforcement layer 13 and

Substructure 16 is formed. The intermediate layer 15 consists of a polymeric material having elastic properties, preferably again in the form of a vulcanized rubber mixture. In this regard, the same rubber technology applies, as it has already been stated in connection with the cover layer and the substructure of the embodiment of FIG. 1. The substructure 16 itself here also comprises a further elastic intermediate layer 17, in particular based on the abovementioned rubber mixture, which is reinforced with fibers 18, in particular with textile fibers. The fibers consist of cotton, cellulose, an aramid, in particular p-aramid, a polyamide (PA), in particular PA6 or PA6.6, a polyvinyl acetal (PVA) or a polyethylene terephthalate (PET). The fibers may be in the form of a pulp or in short fibers. at

Short fibers is the length <8 mm, in particular <5 mm.

Also, the entire base 16 and the cover layer 12 and the two intermediate layers 15 and 17 may be reinforced with fibers of the type mentioned above.

In the embodiment according to FIG. 2, both the cover layer 12 and the force transmission zone 22 of the substructure 16 are provided with a coating 23 or 24 in the form of a textile support. With regard to the relevant material technology of the coating is on in connection with the drive belt of FIG. 1

Said directed.

The diagram of FIG. 3 holds the result of Trumkraftverhaltens three

V-ribbed belt (KRR) with different Zugstrangkonzeption fixed, where the abscissa X is the running time in hours and the ordinate Y the tension force in N. All three KRR grades (a, b, c) based on an EPDM blend were made in the same way with the same mold in the molding process. With regard to the tension cord, the following material aspects applied: - KRR (a) tension cord exclusively from PA6.6

Cord construction 940 dtex x2x3

Strand rotation / cord rotation 150/125 tpm

Spool pitch 100 threads / 100 mm width - KRR (b) Pull cord made exclusively of PEEK

Cord construction 1230 dtex xlx4

Wire rotation / cord rotation 200/100 tpm

Spool pitch 100 threads / 100 mm width - KRR (c) Pull cord made exclusively of PET

Cord construction 1100 dtex xlx3

Strand rotation / cord rotation 210/100 tpm

Spool pitch 100 threads / 100 mm width The belts were tested on a double-disc test stand (disc diameter 120 mm). The belts were further biased at room temperature to a strand tension of 500N. The approximately 200-hour test was at a

Ambient temperature of 120 ° C and a speed of 5000 min ^"1 and a

Torque of 20 Nm performed, with the following result:

- Belts with PA6.6 tension cord have been in the first 160 hours because of

temperature-related shrinkage force is a higher voltage, which drops rapidly linearly and will lead in the further course to the fall of the strand tension below the slip limit (curve a). - Belts with PEEK tension cord keep the tension almost constant after running in. Their potential running time is therefore significantly greater (curve b).

- The best tension behavior is shown by a belt with a PET tensile strand (curve c).

The KRR (a, b, c) were stored at room temperature for 270 days. The following data were determined with regard to the shrinkage of the stock:

- KRR (a) Stock shrinkage 0.9%

- KRR (b) bearing shrinkage 0,2%

- KRR (c) Stock shrinkage 0.4% Although the KRR (b) with PEEK tension cord shows the best value for bearing shrinkage. However, taking into account the Trumkraftverhaltens and cost-effectiveness, a significant new approach is taken with the PET train design.

As already illustrate the embodiments of FIG. 1 to 3, is the

focus on the use of the new PET pull train concept in a KRR. The KRR is used in particular in a KRR drive without automatic tensioning system.

However, sometimes low-power drive belts are also operated with an automatic tensioning system, since in some engines there is a reduction in the amount of power

Noise levels can be achieved. A short elongation after runtime is also desirable here, as it facilitates the design of the tensioner and allows more freedom in the design of the KRR drive. The following table now summarizes the measurement instructions that are provided with explanations. measurement regulations

Explanations to the table:

(a) Fineness-related shrinkage force

(b) Fineness-related stress at 5% elongation

(c) is calculated from heat shrink force and length weight

(d) is calculated from stress and length weight

(e) partly deviating from the norm

(f) The samples are stored on the bobbin for 24 hours in standard climate according to EN ISO 139 (20 ° C, relative humidity of 65%) and then measured without drying.

(g) The samples are stored on the bobbin for 24 hours in standard climate according to EN ISO 139 (20 ° C, relative humidity of 65%) and then measured without drying. The measurement is carried out after 10 minutes at 160 ° C. The preload is 0.0005 N / dtex when pinching the yarn.

(h) The samples are placed on the bobbin for 24 hours under standard conditions according to EN ISO 139

(20 ° C, relative humidity of 65%) stored and then measured without drying. The measurement takes place after 2 minutes at 177 ° C.

(i) The samples are placed on the bobbin for 24 hours under standard conditions according to EN ISO 139

(20 ° C, relative humidity of 65%) stored and then measured without drying. The preload is 0.0005 N / dtex.

List of Reference Numerals (part of the description)

1 drive belt or multi-ribbed belt (KRR)

2 top layer as belt back

3 reinforcement layer

4 tensile strand

5 substructure

6 ribs

7 grooves

8 power transmission zone

9 Coating in the form of a flocking (section A)

10 coating in the form of a textile coating (section B)

11 drive belts or V-ribbed belts

12 top layer as belt back

13 reinforcement layer

14 tensile strand

15 intermediate layer in the form of an investment mixture

16 substructure

17 liner

18 fibers

19 Vine rib zone

20 ribs

21 grooves

22 power transmission zone

23 coating in the form of a textile overlay

24 coating in the form of a textile cover

X abscissa: duration in hours

Y Ordinate: Trum force in N

a KRR with tension cord made of PA6.6

b KRR with pull cord made of PEEK

c KRR with pull cord made of PET

Claims

claims

A drive belt (1, 11) having a body of a polymeric material having elastic properties, comprising a cover layer (2, 12) as a belt back and a base (5, 16) with a power transmission zone (8, 22)

- According to a first variant in the base body at least one tensile strand (4, 14) is embedded in cord construction or - according to a second variant between the cover layer (2, 12) and the substructure

(5, 16) an intermediate layer (15) made of a polymeric material having elastic properties is arranged, wherein in the intermediate layer at least one

Tensile cord (4, 14) is embedded in cord construction; or - according to a third variant, at least one tension cord (4, 14) in cord construction forms a cord layer, wherein between the Cordlage and the cover layer (2, 12) and / or between the Cordlage and the substructure (5, 16) an intermediate layer of a arranged polymer material with elastic properties; characterized in that the tensile strand (4, 14) consists wholly or partly of a polyethylene terephthalate (PET), wherein the PET is formed from a yarn, connected to the following yarn and cord parameters:

A cord length weight <3600 dtex;

A heat shrinkage of the yarn <5% after 2 minutes at 177 ° C and a bias of 0.0005 N / dtex;

- a corresponding force of the yarn> 3.4 cN / dtex at an elongation of 5% at 25 ° C and at a pretension of 0.0005 N / dtex; such as - a heat shrinkage force of Cordes> 0.12 cN / dtex in hot air at 160 ° C after 10 minutes and at a bias of 0.0005 N / dtex.

2. Drive belt according to claim 1, characterized in that according to the first variant, a plurality of parallel tension cords (4, 14) are embedded in the base body or according to the second variant also arranged in parallel

Tensile strands (4, 14) are embedded in the intermediate layer or according to the third variant, in turn, several parallel Zugstränge (4, 14) form the Cordlage, wherein in all three variants each Zugstrang in Cordkonstruktion completely or partially consists of a PET.

3. Drive belt according to claim 2, characterized in that the tension cords (4, 14) are arranged in one layer.

4. Drive belt according to one of claims 1 to 3, characterized in that the tensile strand (4, 14) consists entirely of PET.

5. Drive belt according to one of claims 1 to 3, characterized in that the tensile strand (4, 14) is partially made of PET by being mixed with at least one further material, in a quantity majority of PET.

6. Drive belt according to claim 5, characterized in that the PET with a polyamide (PA), polyimide (PI), aramid, polyvinyl acetal (PVA), polyester (PES), polyetheretherketone (PEEK) or a polyethylene-2,6-naphthalate (PEN) or mixed in a combination of the aforementioned materials.

7. Drive belt according to claim 5 or 6, characterized in that the

PET content within a tensile strand (4, 14) is at least 55% by weight.

8. Drive belt according to claim 7, characterized in that the PET content within a tensile strand (4, 14) 55 wt .-% to 95 wt .-% is.

9. Drive belt according to claim 7 or 8, characterized in that the

PET content within a tensile strand (4, 14) is 75% by weight to 95% by weight.

10. Drive belt according to one of claims 1 to 9, characterized in that the cord length weight is 2000 dtex to 3500 dtex.

11. Drive belt according to one of claims 1 to 10, characterized in that the Heißschrumpfweg of the yarn is <4%.

12. Drive belt according to one of claims 1 to 11, characterized in that the corresponding force of the yarn is> 3.8 cN / dtex.

13. Drive belt according to one of claims 1 to 12, characterized in that the heat shrinkage force of the cord is> 0.18 cN / dtex.

14. Drive belt according to one of claims 1 to 13, characterized in that the tensile strand (4, 14) has a cord construction of 900 dtex to 1300 dtex xlx3 or 900 dtex to 1300 dtex xlx2.

15. Drive belt according to claim 14, characterized in that the tensile strand (4, 14) has a cord construction of 1100 dtex xlx3 or 1100 dtex xlx2.

16. Drive belt according to one of claims 1 to 15, characterized in that the tensile strand (4, 14) has a strand rotation> 180 tpm.

17. Drive belt according to claim 16, characterized in that the strand rotation is> 200 tpm.

18. Drive belt according to claim 16 or 17, characterized in that the

Strand rotation is 200 tpm to 220 tpm.

19. Drive belt according to one of claims 1 to 18, characterized in that the tension cord (4, 14) has a cord rotation of <160 tpm.

20. The drive belt according to claim 19, characterized in that the cord rotation is <135 tpm.

21. Drive belt according to claim 19 or 20, characterized in that the

Cord rotation is 90 tpm to 135 tpm.

22. Drive belt according to one of claims 1 to 21, characterized in that the polymeric material of the cover layer (2, 12) and / or the substructure (5, 16) and / or the intermediate layer (15) for the tensile strand (4, 14 ) and / or optionally a further intermediate layer (17) is a vulcanized rubber mixture containing at least one rubber component and Mischingingredienzien.

23. Drive belt according to claim 22, characterized in that the

Rubber component: ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM), (partially) hydrogenated nitrile rubber (HNBR), chloroprene rubber (CR), fluoro rubber (FKM), natural rubber (NR) , Styrene

Butadiene rubber (SBR) or a butadiene rubber (BR), which is uncut or blended with at least one other rubber component,

especially in conjunction with one of the aforementioned types of rubber are used.

24. Drive belt according to claim 23, characterized in that the rubber component is EPM or EPDM or an EPM / EPDM blend.

25. Drive belt according to one of claims 1 to 24, characterized in that the cover layer (2, 12) and / or the substructure (5, 16) and / or the intermediate layer (15) for the tension cord and / or possibly a further intermediate layer (17) is reinforced with fibers (18) / are.

26. Drive belt according to claim 25, characterized in that the fibers (18) are textile fibers.

27. Drive belt according to claim 26, characterized in that the fibers (18) made of cotton, cellulose, an aramid, in particular p-aramid, a polyamide (PA), in particular PA6 or PA6.6, a polyvinyl acetal (PVA), or a Polyethylene terephthalate (PET) or a mixture of one of the aforementioned

Fiber types exist.

28. Drive belt according to one of claims 25 to 27, characterized in that the fibers (18) are in the form of a pulp or in short fibers.

29. Drive belt according to claim 28, characterized in that the short fibers have a length <8 mm.

30. Drive belt according to claim 29, characterized in that the short fibers have a length <5 mm.

31. Drive belt according to one of claims 1 to 30, characterized in that the cover layer (2, 12) and / or the power transmission zone (8, 22) of the substructure

(5, 16) is / are provided with a coating (9, 10, 23, 24).

32. Drive belt according to claim 31, characterized in that the coating (10, 23, 24) comprises a textile support.

33. Drive belt according to claim 32, characterized in that the textile support is a woven, knitted or knitted fabric.

34. Drive belt according to claim 31, in particular in conjunction with claim 32 or 33, characterized in that the coating (9, 10, 23, 24) a

Fluoroplastic includes.

35. Drive belt according to claim 34, characterized in that the

Fluoroplastic is polytetrafluoroethylene (PTFE) and / or polyvinyl fluoride (PVF) and / or polyvinylidene fluoride (PVDF).

36. Drive belt according to claim 35, characterized in that the

Fluoroplastic is PTFE.

37. Drive belt according to one of claims 1 to 36, characterized in that the drive belt (1, 11) is designed as a V-ribbed belt.

38. Drive belt according to claim 37, characterized in that the

V-ribbed belt (1, 11) in a V-ribbed belt drive without automatic

Clamping system is used.