DE102007044436A1 - Endless elastic drive belt, in particular V-belt or V-ribbed belt, with reduced tension loss - Google Patents

Abstract

The invention relates to an endless elastic drive belt (1), in particular a V-belt or V-ribbed belt, comprising at least: - a substructure (5) of elastomeric material optionally provided with a flocking (9) or textile support (10) and / or containing fibers, the substructure comprising ribs (6) and grooves (7) comprising the power transmission zone (8); - A cover layer (2) made of elastomeric and / or textile material, optionally containing fibers; and - a tensile strength receiving strength element, which is embedded between the substructure (5) and cover layer (2). The drive belt (1) according to the invention is characterized in that the strength element, in particular in the form of individual tension cords (4) forming a reinforcement layer (3), consists wholly or partly of a polyetheretherketone (PEEK).

Description

• – einen Unterbau aus elastomerem Werkstoff, der gegebenenfalls mit einer Beflockung oder Textilauflage versehen ist und/oder Fasern enthält, wobei der Unterbau die Kraftübertragungszone umfasst;
• – eine Decklage aus elastomerem und/oder textilem Werkstoff, der gegebenenfalls Fasern enthält; sowie
• – einen die Zugkraft aufnehmenden Festigkeitsträger, der zwischen Unterbau und Decklage eingebettet ist.

The invention relates to an endless elastic drive belt, in particular V-belt or V-ribbed belt comprising at least:

• - A substructure of elastomeric material, which is optionally provided with a flocking or textile overlay and / or fibers, wherein the substructure comprises the power transmission zone;
• - A cover layer of elastomeric and / or textile material, optionally containing fibers; such as
• - A force absorbing the tensile strength, which is embedded between the base and top layer.

Of the includes the concept of elasticity mentioned above the longitudinal and bending elasticity, the longitudinal elasticity in the drive belt according to the invention of particular Meaning is.

Regarding The prior art drive belt, also referred to as power transmission belt be and as a flat belt, V-belt, V-ribbed belt and Timing belt can be formed, in particular referenced the following patent literature:

flat belts

• DE 103 54 093 A1

fan belt

• EP 0 662 571 B1

V-ribbed belts

• DE 38 23 157 A1
• DE 100 16 351 A1
• DE 10 2006 007 509 A1
• EP 0 590 423 A2
• EP 0 737 228 B1
• EP 0 831247B1
• EP 0 866 834 B1
• EP 1 108 750 A1
• EP 1 129 308 B1
• US 3,981,206

toothed belt

• EP 0 599 145 B1
• EP 0 737 228 B1
• EP 0 866 834 B1
• EP 1 088 177 B1
• EP 1 129 308 B1
• WO 2005/080821 A1
• WO 2006/066669 A1
• US 5,417,618

• – Stahl
• – Polyamid
• – Aramid
• – Polyester
• – Glasfasern
• – Kohlefasern

As strength carriers (tension members) of these drive belts so far the following materials are used:

• - Stole
• - polyamide
• - Aramid
• - polyester
• - Glass fibers
• - carbon fibers

she occur in the context of a reinforcement layer in particular as pararallel pulling cords, in particular again in the form of single cords or single filament yarns.

in the The following are the strength carrier problems in drive belts, in particular using the example of the V-ribbed belt, explained in more detail.

In a normal V-ribbed drive, the voltage is controlled by an automatic Spanner maintained. As long as the work area of the tensioner is not left, does not lead a belt elongation to a drop in the belt tension below the slip limit.

at Riementrieben, where for cost reasons on the tensioner is dispensed with, the belt is more pre-stretched. at The belt is pulled over the pulleys. Such Belts are referred to as "snap-on straps." The belt then in operation a rubber band must equal the tension itself maintained. This succeeds with longitudinally elastic V-ribbed belts, which are characterized by a significantly lower module than normal V-ribbed belts with polyester tension cord. They contain in usually polyamide tension cords. In automotive applications are in connection with the polyamide short name PA in particular PA66 and PA46 drawstrings used.

belt with Polyamidzugsträngen lose in belt drives without Clamping system with a high number of rollers and at a high Power transmission relatively quickly the necessary Tension. With a significant increase in preload you can remedy this situation. But the associated bearing loads are in practice mostly unacceptable.

Also, the belt can usually not be made arbitrarily wide. Thus, to increase the power transmission per belt width, an improvement in the power transmission capability of the tension cords themselves is required. A simple increase in the diameter of the cords does not lead to the goal, since such belts tend in operation to a faster unwinding of the cords at the cutting edges, which is also known as "corduroy pop-out" be records.

Another problem with Polyamidzugsträngen is too high a bearing shrinkage. This one tries to reduce by a tension-free as possible assembly of the belt ( EP 0 831 247 B1 ). In practice, there are always problems with the mounting of elastic V-ribbed belts, as the belts shorten during prolonged storage, as occurs in particular in the replacement market, too much.

low module Belts are sometimes also operated with tensioner, as in some Engines a reduction of the noise level can be achieved can. In operation with tensioner are also a low elongation behavior and the lowest possible shrinkage desirable.

in the Background of the above problem is the task an endless elastic drive belt, in particular V-belt or V-ribbed belt, which compared to the previously known drive belt, in particular based on Polyamidzugsträngen, itself due to a very low bearing shrinkage and a significantly lower Voltage drop after running on a motor is characterized.

Solved This task is characterized in that the strength carrier wholly or partly consists of a polyetheretherketone (PEEK).

• – Der Festigkeitsträger besteht aus wenigstens einem Zugstrang, insbesondere jedoch aus zwei oder mehreren Zugsträngen, die nebeneinander angeordnet eine Festigkeitsträgerlage bilden. Die Zugstränge weisen dabei im Wesentlichen den gleichen Abstand zueinander auf.
• – Der Zugstrang besteht aus einem oder mehreren Multifilamentgarnen.
• – Der Zugstrang kann auch aus einem Zwirn gebildet sein, insbesondere in Form eines mehrstufigen Zwirns. Die Zwirndrehung beträgt vorzugsweise zwischen 50 und 300 tpm (turns per meter).
• – Der Zugstrang weist ein Gesamtlängengewicht von 1000 bis 20000 dtex, insbesondere von 2000 bis 10000 dtex, optimalerweise von 3000 bis 6000 dtex, auf. Diese Daten beziehen sich auf den einzelnen Zugstrang.
• – Der Zugstrang besteht ganz aus PEEK, und zwar in Bezug auf seinen textilen Anteil.

With regard to the reinforcement, the following design options are advantageous:

• - The reinforcement consists of at least one tensile strand, but in particular of two or more tensile strands, which form juxtaposed form a reinforcement layer. The tension cords have substantially the same distance from each other.
• - The tension cord consists of one or more multifilament yarns.
• The tension cord can also be formed from a thread, in particular in the form of a multi-stage thread. The twisting is preferably between 50 and 300 tpm (turns per meter).
• - The tensile strand has a total weight of 1000 to 20,000 dtex, in particular from 2,000 to 10,000 dtex, optimally from 3,000 to 6,000 dtex, on. These data refer to the individual tensile strand.
• - The tension cord consists entirely of PEEK, in terms of its textile content.

in the As part of an alternative, the tensile strand next to PEEK at least another material, in particular another textile material, for example, polyamide (PA). In such a mixed constellation the percentage of PEEK has the majority. The training takes place here especially as a mixing yarn, for example as PEEK / PA mixed yarn.

Further advantageous design options of the invention Drive belt are presented in the description of the figures.

The Invention will now be based on embodiments below Referring to schematic drawings explained. Show it:

1 a cross section of a V-ribbed belt in two versions (sections A and B);

2 Another embodiment of a V-ribbed belt in three-dimensional detail.

1 shows a drive belt 1 in the form of a V-ribbed belt with a cover layer 2 , a reinforcement layer 3 with longitudinally extending parallel strands 4 as well as with a substructure 5 ,

The tensile cords 4 may have a cord construction. Advantageously, however, the tensile cords are in a multifilament yarn construction. An advantageous alternative is also the tensile strand formation as a twist, in particular in the form of a multi-stage twist, preferably at a twist of between 50 and 300 tpm. Each tensile strand can consist entirely of PEEK or be mixed with at least one other material, for example in the form of a PEEK / PA mixed twine.

Every string of tension 4 may additionally be provided with an adhesive layer, which is in particular a resorcinol-formaldehyde latex (RFL).

• – ein chlorsulfoniertes Polyethylen (CSM)
• – ein chlorierter Kohlenwasserstoff, beispielsweise Chlorparaffin
• – ein Isocyanat, beispielsweise Hexamethylendiisocyanat (HDI)
• – ein Silan, beispielsweise ein Alkoxyaminosilan
• – Dinitrosobenzol
• – Bismaleinimid

In addition to the adhesive layer may also be present an additional overlayer. In particular, the following substances or substance groups are used as overcoat:

• A chlorosulfonated polyethylene (CSM)
• A chlorinated hydrocarbon, for example chlorinated paraffin
• An isocyanate, for example hexamethylene diisocyanate (HDI)
• A silane, for example an alkoxyaminosilane
• - Dinitrosobenzene
• - bismaleimide

The Isocyanate is present in particular as di- or tri-isocyanate.

alternative For this purpose, the overlayer may also be an adhesive cement.

The bending elasticity of the drive belt 1 or V-ribbed belt is characterized by an elastomeric material for the cover layer 2 and the substructure 5 causes. The basis of the elastomeric materials are in particular an ethylene-propylene copolymer (EPM), an ethylene-propylene-diene copolymer (EPDM) or polychloroprene. In connection with these elastomeric materials, the use of the above-presented system of adhesive layer and overlayer is particularly optimal, and indeed under the aspect of an extremely effective adhesion of the tension cord material PEEK to the cover layer or to the substructure.

The substructure 5 has a V-rib structure formed of ribs 6 and grooves 7 , On his wear-prone work page 8th , which is also referred to as a power transmission zone, is the drive belt 1 or V-ribbed belt with a layered flocking 9 (Section A), for example, with a cotton or aramid flock after DE 38 23 157 A1 , or with a textile overlay 10 (Section B), for example with a material concept DE 10 2006 007 509 A1 , Mistake. With such flocking or textile support a combination of wear protection and noise insulation is achieved.

2 now shows another drive belt 11 , also in the form of a V-ribbed belt, which is a cover layer 12 , a reinforcement layer 13 and a substructure 16 includes. The reinforcement layer is also here of individual tensile cords 14 formed entirely or partially from PEEK. In this regard, reference is made to the already presented above PEEK textile technology.

The reinforcement layer 13 or the tensile cords 14 here are completely from an embedding mixture 15 surrounded, so that in this way an effective total adhesion of top layer 12 , Reinforcement layer 13 and substructure 16 is formed.

The substructure 16 even here includes an elastic intermediate layer 17 that with fibers 18 , in particular textile fibers, for example aramid or cotton fibers, is reinforced, and a V-ribbed zone 19 formed by ribs 20 and grooves 21 ,

The embedding mixture 15 and the liner 17 can like the top layer 12 and the substructure 16 consist of an elastomeric material based on EPM, EPDM or CR.

The drive belt 11 or V-ribbed belt is on its wear-prone working side 22 also with a textile cover 23 provided, for example, according to a material concept DE 10 2006 007 509 A1 , The textile cover may be uncoated or coated. The coating is based in particular on a thin sealant ( WO 2005/080821 A1 ). As a result, for example, the oil resistance of the drive belt or V-ribbed belt can be increased.

The top layer 12 is in accordance with the embodiment 2 still with a back fabric 24 fitted. The back fabric can textile technology, for example, as the textile cover 23 be designed. In this regard, reference is made to the cited prior art.

Up to now, the material PEEK has only been known as a toothed support for timing belts in drive belts ( WO 2006/066669 A1 ). With such a tooth pad, the temperature resistance of the toothed belt is increased and prevents failure phenomena. The tooth pad is designed as a fabric comprising warp and weft threads. When using the PEEK material as strength carrier or tensile strand has surprisingly been found that in the background of the above-mentioned problem with this material concept a very low bearing shrinkage and a reduced loss of tension in longitudinally elastic drive belt can be realized.

In In this connection, a comparative experiment will be described below. which provided a result in the background of the previously known PEEK textile technology was not expected.

• Typ A: Zugstränge ausschließlich auf Basis PA66
• Typ B: Zugstränge ausschließlich auf Basis PEEK

Two types A and B of a V-ribbed belt based on a same EPDM mixture were prepared in the same manner with the same shape in the molding process. Also the number of tension cords were the same The differences were only:

• Type A: tension cords exclusively based on PA66
• Type B: tension cords exclusively based on PEEK

The belts were tested on a double disc test stand (disc diameter 120 mm). The belts were preloaded to a strand tension of 500 N at room temperature. The approximately 200-hour test was carried out at an ambient temperature of 120 ° C and a speed of 5000 min ^-1 and a torque of 20 Nm. For the first 160 hours, belts with a PA66 tensile strand have a higher tension due to the temperature-related shrinkage force, which quickly drops linearly and subsequently leads to a drop in the strand tension below the slip limit. Belts with PEEK tension cord keep the tension almost constant after running in. Their potential lifetime is therefore significantly greater.

The belts of both types A and B were stored at room temperature for 270 days. Here were the belts with PA66 Zugstrang a La Shrinkage of 0.9%, with the belts with PEEK tensile strand only a shrinkage of 0.2% observed.

Further Experiments had shown that in a PEEK tensile strand according to statements according to one of claims 5 to 11, the most optimal results with regard to the task.

About that In addition, drawstrings are based on PEEK-based in comparison to polyester and polyamide strands by a significant higher heat and chemical resistance.

1

drive belts or V-ribbed belt

2

topsheet

3

Reinforcement layer (Tensionable layer)

4

tension cord

5

substructure

6

ribs

7

grooves

8th

wear-prone Working side (power transmission zone)

9

flocking (Section A)

10

textile wraps (Section B)

11

drive belts or V-ribbed belt

12

topsheet

13

Reinforcement layer (Tensionable layer)

14

tension cord

15

Einbettmischung

16

substructure

17

liner

18

fiber reinforcement

19

V-ribbed zone

20

ribs

21

grooves

22

wear-prone Working side (power transmission zone)

23

textile wraps

24

backing fabric

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10354093 A1 [0003]
• EP 0662571 B1 [0003]
• - DE 3823157 A1 [0003, 0028]
• - DE 10016351 A1 [0003]
• DE 102006007509 A1 [0003, 0028, 0033]
• - EP 0590423 A2 [0003]
• - EP 0737228 B1 [0003, 0003]
• - EP 0831247 B1 [0003, 0011]
• - EP 0866834 B1 [0003, 0003]
• EP 1108750 A1 [0003]
• - EP 1129308 B1 [0003, 0003]
• - US 3981206 [0003]
• - EP 0599145 B1 [0003]
• - EP 1088177 B1 [0003]
• WO 2005/080821 A1 [0003, 0033]
• WO 2006/066669 A1 [0003, 0035]
• US 5417618 [0003]

Claims (24)

Endless elastic drive belt ( 1 . 11 ), comprising at least: - a substructure ( 5 . 16 ) made of elastomeric material, optionally with a flocking ( 9 ) or textile overlay ( 10 . 23 ) and / or contains fibers, wherein the substructure the power transmission zone ( 8th . 22 ); - a cover layer ( 2 . 12 ) of elastomeric and / or textile material, optionally containing fibers; and - a traction-absorbing reinforcement between the base ( 5 . 16 ) and top layer ( 2 . 12 ) is embedded; characterized in that the strength member consists wholly or partly of a polyetheretherketone (PEEK). Endless elastic drive belt ( 1 . 11 ) in the form of a V-belt or V-ribbed belt comprising at least: - a substructure ( 5 . 16 ) made of elastomeric material, optionally with a flocking ( 9 ) or textile overlay ( 10 . 23 ) and / or contains fibers, wherein the substructure with its wedge or V-rib structure, the power transmission zone ( 8th . 22 ); - a cover layer ( 2 . 12 ) of elastomeric and / or textile material, optionally containing fibers; and - a traction-absorbing reinforcement between the base ( 5 . 16 ) and top layer ( 2 . 12 ) is embedded; characterized in that the strength member consists wholly or partly of a polyetheretherketone (PEEK). Drive belt according to claim 1 or 2, characterized in that the strength support of at least one tensile strand ( 4 . 14 ) consists. Drive belt according to claim 3, characterized in that the strength member of two or more tensile strands ( 4 . 14 ), which arranged juxtaposed a reinforcement layer ( 3 . 13 ) form. Drive belt according to claim 3 or 4, characterized in that the tension cord ( 4 . 14 ) consists of one or more multifilament yarns. Drive belt according to claim 3 or 4, characterized in that the tension cord ( 4 . 14 ) is formed from a thread. Drive belt according to claim 6, characterized in that the tension cord ( 4 . 14 ) is formed of a multi-stage thread. Drive belt according to claim 6 or 7, characterized that an outer twisting rotation between 50 and 300 tpm is present. Drive belt according to one of claims 3 to 8, characterized in that the tension cord ( 4 . 14 ) has a total length weight of 1000 to 20,000 dtex. Drive belt according to claim 9, characterized in that the tension cord ( 4 . 14 ) has a total length weight of 2,000 to 10,000 dtex. Drive belt according to claim 9 or 10, characterized in that the tension cord ( 4 . 14 ) has a total length weight of 3000 to 6000 dtex. Drive belt according to one of claims 3 to 11, characterized in that the tension cord ( 4 . 14 ) is made entirely of PEEK, in terms of the textile portion of the drawstring. Drive belt according to one of claims 3 to 11, characterized in that the tension cord ( 4 . 14 ) comprises at least one further material in addition to PEEK. Drive belt according to claim 13, characterized that the further material is a textile material, for example Polyamide, is. Drive belt according to claim 13 or 14, characterized characterized in that the percentage of PEEK is the majority has. Drive belt according to one of the claims 13 to 15 in connection with one of claims 6 to 8, characterized in that the tensile strand ( 4 . 14 ) is designed as a mixing yarn. Drive belt according to one of claims 1 to 16, characterized in that the strength element, in particular the tensile strand ( 4 . 14 ), is provided with an adhesive layer. Drive belt according to claim 17, characterized the adhesive layer is a resorcinol formaldeyde latex (RFL). Drive belt according to claim 17 or 18, characterized characterized in that the adhesive layer with an additional overlayer equipped. Drive belt according to claim 19, characterized in that the overcoat comprises a chlorosulfonated polyethylene (CSM), a chlorinated hydrocarbon, an isocyanate, in particular a di- or tri-isocyanate, a silane and dinitrosobenzene or Contains bismaleimide. Drive belt according to claim 19, characterized that the overlayer is an adhesive cement. Drive belt according to one of claims 1 to 21, characterized in that between the substructure ( 16 ) and the cover layer ( 12 ) an embedding mixture ( 15 ) of elastomeric material for the reinforcement, in particular for the tensile strand ( 14 ) is arranged. Drive belt according to claim 22, characterized in that the strength member, in particular the tensile strand ( 14 ), in whole or in part in the embedding mixture ( 15 ) is embedded. Drive belt according to one of claims 1 to 23, characterized in that the substructure ( 5 . 16 ) and / or the cover layer ( 2 . 12 ) and / or the investment mixture ( 15 ) is an elastomeric material based on a rubber mixture, wherein the rubber component is an ethylene-propylene copolymer (EPM), ethylene-propylene-diene copolymer (EPDM) or Polychlopren (CR).