WO2015192983A1

WO2015192983A1 - Splice for connecting reinforcing elements in an elastomeric component

Info

Publication number: WO2015192983A1
Application number: PCT/EP2015/057147
Authority: WO
Inventors: Hermann Schulte
Original assignee: Contitech Antriebssysteme Gmbh
Priority date: 2014-06-16
Filing date: 2015-04-01
Publication date: 2015-12-23
Also published as: DE102014211455A1; DE202014010505U1

Abstract

Splice for connecting two ends (5a, 5b) of reinforcing elements, laid or twisted from braids, ply yarns or filaments (7, 8, 9), in an elastomeric component (2), in particular for connecting cords in drive belts or conveyor belts, wherein the splice or connecting region has substantially the same number of braids, ply yarns or filaments as the adjacent non-spliced regions and is surrounded by a sheath (10) which encloses, under pressure, the braids, ply yarns or filaments that remain in the splice or connecting region.

Description

description

Splice for joining reinforcements in an elastomeric component

The invention relates to a splice for connecting two ends of strands made of strands, twines or filaments or twisted strength members in an elastomeric component, in particular a splice in drive belts or conveyor belts, to the

Connection of the existing there Corden / strength carrier is used. Furthermore, the invention relates to a suitable method for producing such a splice method and the use of such a splice in particularly loaded elastomeric components.

Tensile or power transmission means of elastomeric material, such as rubber,

Polyurethane (PU) or plastic, have the tensile force transmission in most cases

Reinforcement on, wherein in the strength member each one or more strands, threads or filaments of different types of fibers are arranged, often beaten or twisted and / or formed as a fiber bundle or filament yarn. The reinforcements are firmly bound in the elastomeric material, e.g. Rubber vulcanized in the rubber matrix.

Compounds of broken ropes and cables of general type, for example by splices, are widely known. For example, DE 603 08 552 T2 discloses

A method of manufacturing a splice for a cable cord in which carded or stranded cable ends are inserted against each other in openings in the other end. Connections of reinforcing elements in elastomeric components subject to high mechanical stress, for example in drive belts in the form of toothed belts, have hitherto been rather uncommon. So toothed belts are still produced mainly with cords without splice as a strength and tensile strength. Unused residual quantities of cords remain on the supply reels of the Cord suppliers. This results in an increased amount of waste during production. A splice as a combination of reinforcements in a drive belt, for example, must meet high requirements. Such a splice must not only have a sufficient tensile strength in the later operating state under constant bending changes, but must also be able to withstand the forces arising during the production of the drive belt, here, for example, in a winding process without problems

Junction breaks or hooked somewhere in the winder.

On the other hand, such a splice must not lead to irregularity in the belt structure, i. no thickening, no visible knot, and also no reduction in the flexural elasticity or the yieldable bending stress of the belt.

For the invention, therefore, the object was by providing a suitable connection technique for strength carrier in elastomeric material on the one hand the

Reduce waste quantities of cord material so that all delivered materials can be used and processed, on the other hand the production process of

Strengthen provided elastomer components to improve in which, for example, a so-called winding process in which strength carrier are placed on a constructed of elastomeric material body of rotation, which is later re-separated as a multiple component, no longer in half or still filled winding (drum ) must be stopped without the remaining remaining cord can be used.

Furthermore, it was an object of the invention to provide a compound with a high strength in Operation of the elastomeric material and to provide in its preparation, which can be readily used as a substitute for the previously used almost exclusively one-piece cords. This object is achieved by the features of the main claim. Further advantageous embodiments are disclosed in the subclaims.

In this case, the splice or connecting region has substantially the same number of strands, twines or filaments as the adjacent non-spliced regions and is surrounded by a covering enclosing the splices or filaments under pressure enclosing under pressure.

As can easily be understood by the use as such a splice according to the invention in the production of elastomeric components of the residual amount of

Corden / strength supports greatly reduced because almost all significant residual amounts are combined with a good cord-splice again to form a strand by the combination of reinforcements, the z. B. in the form of a completely filled cord coil can be used in production again. Due to the inventive design of the splice, namely by essentially the same number of strands, threads or filaments in the splice as in the adjacent non-spliced areas and enclosing under pressure wrapping creates a combination of reinforcements, which also readily loaded in high

elastomeric components can be used. The resulting splice is a very bendable and flexible joint that does not interfere with the continuous winding process and that can remain in the belt without adversely affecting the essential belt properties.

An advantageous development is that the two through the splice

connected ends are formed by respective removal of a number of strands, twines or filaments in the splice or connection area thinned / tapered, in particular by removing an equal number of strands, twines or filaments at both ends. This gives a simple way the flexibility and bending properties of the strength member in the splice and thus, of course, the corresponding properties of the elastomeric components. That's about in one

Toothed belt for use in a belt drive, the splice area as strong as the other areas.

A further advantageous embodiment consists in that the wrapping consists of a yarn wrap applied under tension, in particular of a yarn with a smaller diameter than that of the strands. This simplifies the manufacture of the splice and produces no or only a small application, i. a barely noticeable thickening in the region of the splice.

A further advantageous embodiment is that the splice length is between 50 and 400 mm. Thus, the usual forms of drive belts, such as e.g.

Flat belts, V-belts, V-ribbed belts and toothed belts can be provided in a simple manner by appropriate splicing length design with splices adapted to the tensile loads and flexural strength. A further advantageous embodiment is that the splice is used to connect two ends of reinforcements made of glass fibers, aramid fibers, polyamide fibers (PA) or polyethylene fibers (PE). With all these materials, the splice according to the invention can be used without difficulty. A particularly suitable method for producing a splice according to the invention is that

first the beaten or twisted strands, threads or filaments are separated or separated at both ends of the strength members to be joined, preferably over a length of 50 to 400 mm,

- That thereafter a first number of isolated strands, twines or filaments of one end with a second number of isolated strands, twist or Filaments are connected to the other end, wherein the sum of the first number and the second number, the total number of strands, threads or filaments in one of the not spliced adjacent areas of the

does not exceed connected ends,

- Where the unconnected isolated strands, twist or

Filaments of both ends at the beginning of the separation or

Separation area to be separated, and

finally, providing the interconnected first and second plurality of strands, twines or filaments with a sheath compressively compressing the bonded strands, twines or filaments, which extends substantially the length of the splice.

Such process training allows for both manual and machine fabrication and involves only a few simple steps that can be easily incorporated into an existing manufacturing process.

Another advantageous, because very simple design of the manufacturing process is that an equal number of separated strands, twines or filaments of both ends is connected together preferably such that each half of the originally existing strands, twines or filaments connected to each other and the other Half is separated. Of course, it is also possible, with due regard to the tensile forces to be transmitted in the splice, that different numbers of strands, twines or filaments are connected to one another from both ends. Another embodiment of the method, which is also advantageous because of its simplicity, is that the covering is applied by means of a wrapping of the splice applied with tension with a yarn. Of course, other types of

Encasing possible, for example, by compressed and splice enclosing sleeves, by "crimping" applied sleeves, or by vulcanization of the splice under pressure. As already indicated, the splice according to the invention with its high strength and bendability can be used particularly well for highly loaded elastomeric components, namely for the connection of the ends of reinforcements or cords in

Drive belts, in particular in toothed belts or for connecting the ends of reinforcements or cords in conveyor belts.

Based on an aligned on the method steps according to the invention

Embodiment, the invention will be explained in more detail. Show it

Fig. 1 a belt drive as a sketch in an overall view

2a-2g sketches of the method steps for producing a

Splice according to the invention

Fig. 3 Photo of a finished splice

Fig. 1 shows in the sense of an overall view and the overview of a section of a belt drive 1 with an elastomeric material (rubber) existing

Toothed belt 2, which is driven by a toothed disc 3 and on a back roller 4 (tensioning or deflection roller) passes. The toothed belt is provided with reinforcements / tension strands 5. The strength element 5 or tension member or tensile strand is here an aramid cord, which consists of twisted strands. Depending on the position of the tension roller 4 arise in the timing belt and thus in the reinforcements 5 high loads, inter alia, by bending. FIGS. 2 a to 2 g show, in the form of sketches, the implementation of a method for producing a splice for connecting two ends of the reinforcing member 5 designed here as an aramid cord.

FIG. 2 a shows an end 5 a of a reinforcing element 5 to be connected. FIG. 2 b shows the use of a needle 6 with which initially the beaten or twisted strands are separated or separated at the end 5 a of the reinforcing elements 5 to be connected. In this Case consists of the strength member 5 of two strands 7 and 8, which are shown as separated strands in Fig. 2c.

As shown in FIG. 2 d, the isolated strands of the ends, here the strand 8, not intended for connection or joining, are severed at the beginning of the separation or singulation region. The same thing happens to the strands of another end 5b provided for connection, so that the state shown in FIG. 2e arises.

2e and 2f show how the first number of separated strands of one end 5a, here the strand 7, is connected to a second number of singulated strands of another end 5b, here the strand 9, the sum of the first number and the second number does not exceed the total number of strands, threads or filaments in one of the unspliced adjacent portions of the joined ends.

The strands 7 and 9 are twisted together / twisted in this case. Thus, there are two strands in the splice here, namely the strand 7 of one end 5a of the tensile strand 5 and the strand 9 of the other end 5b of the tensile strand 5, as well as in the

Regions adjacent to the splice and over the remaining length of the tensile strand 5, in which two strands are present, as shown in FIGS. 2a to 2d.

Finally, as shown in Figure 2g, the interconnected first strand 7 and second strand 9 are provided along the length of the splice with a sheath 10 compressively compressing the strands, by wrapping the splice with a yarn 11 under tension is applied.

In this case, the structure of the splice is thus such that in each case half of the originally present two strands of one end are connected to one another and the other half is severed. Fig. 3 shows once again a photo of a finished splice with the splice length 12 of 130 mm. It will be appreciated that, by having substantially the same number of strands in the splice as in the adjacent non-spliced portions, the thickness of the strength member, including the sheath enclosing the splice under pressure, will not appreciably exceed the original thickness of the strength member outside the splice. The splice is thus equally highly resilient and does not wear in the finished timing belt.

LIST OF REFERENCE NUMBERS

(Part of the description)

1 belt drive

2 toothed belts

3 toothed disc

4 back roller

5 train sträng

5a first end

5b second end

6 needle

7 strand

8 strand

9 strand

10 serving

11 yarn

12 splice length

Claims

claims

1. Splice for connecting two ends (5a, 5b) of stranded, twisted or

Filaments (7, 8, 9) of twisted or twisted reinforcements (5) in an elastomeric component (2), in particular a splice for connecting cords in

Drive belts or conveyor belts, characterized in that the splice or connection region has substantially the same number of strands, twines or filaments (7, 8, 9) as the adjacent non-spliced regions and of a strand remaining in the splice or connection region, Twisted or filaments under pressure enclosing sheath (10) is surrounded.

The splice of claim 1, wherein the two ends (5a, 5b) connected by the splice are removed by respective removal of a number of strands, twines or

Filaments are formed in the splice or connecting area thinned / tapered, in particular by removing a same number of strands, twines or filaments at both ends.

3. splice according to claim 1 or 2, wherein the sheath (10) consists of an applied under train yarn wrap (11).

A splice according to any one of claims 1 to 3, wherein the splice length (12) is between 50 and 400 mm.

5. Splice according to one of claims 1 to 4 for connecting two ends of

Reinforcements made of glass fibers, aramid fibers, PA or PE fibers.

6. A method for producing a splice according to claim 1 to 5, characterized

marked that

first the beaten or twisted strands, threads or filaments (7, 8, 9) are separated or separated at both ends of the reinforcing elements (5a, 5b), preferably over a length of 50 to 400 mm, that thereafter a first number of singulated strands, twines or filaments (7) of one end (5a) are joined to a second number of singulated strands, twines or filaments (9) of the other end (5b), the sum of the first number and the second number does not exceed the total number of strands, threads or filaments in one of the unspliced adjacent portions of the joined ends,

wherein the unconnected isolated strands, twines or filaments of both ends at the beginning of the separation or

Separation area to be separated, and

finally, providing the interconnected first and second plurality of strands, twines or filaments with a sheath (10) compressively compressing the bonded strands, twines or filaments, which extends substantially the length (12) of the splice.

A method according to claim 6, wherein an equal number of separated strands, threads or filaments are joined together from both ends

preferably such that in each case half of the originally existing strands, twines or filaments are connected to each other and the other half is separated.

8. The method of claim 6 or 7, wherein the wrapper is applied by an applied under train wrapping the splice with a yarn (11).

9. Use of a splice according to claim 1 to 5 for the connection of the ends of reinforcements or cords in drive belt, in particular in the timing belt.

10. Use of a splice according to claim 1 to 5 for the connection of the ends of reinforcements or cords in conveyor belts.