Article with textile overlay plated in repeating alternation

Abstract

The present invention relates to an article having an elastic main body based on at least one thermoplastic elastomer or based on a vulcanizate and having an article surface that is provided with a textile overlay in the form of a plated knitted fabric, wherein the textile overlay is composed of at least two types of yarn that alternate in the individual knitted courses at regular intervals.

Claims

1. A power transmission belt comprising: an elastic main body comprising: at least one thermoplastic elastomer or a vulcanizate, and an article surface comprising a top layer surface and a substructure surface comprising a power transmission zone, wherein the substructure surface comprises a textile overlay, wherein the textile overlay is a plated knitted fabric comprised of multiple yarns arranged in individual courses, wherein each individual course includes at least a first yarn formed of a first material type and a second yarn formed of a second material type that is different from the first material type, wherein the plated knitted fabric comprises a top side adhered to the substructure surface and a bottom side opposite the top side, wherein the first yarn of the first material type and the second yarn of the second material type alternate in their facing direction in the individual courses at regular intervals in repeating alternation such that the first yarn of the first material type and the second yarn of the second material type both appear on the top side and the bottom side of the plated knitted fabric.

2. The power transmission belt according to claim 1, wherein the first yarn of the first material type is composed of cellulose fibers, and wherein the second yarn of the second material type is composed of thermoplastic fibers.

3. The power transmission belt according to claim 2, wherein the first yarn of the first material type is composed of cotton.

4. The power transmission belt according to claim 2, wherein the first yarn of the first material type is composed of viscose.

5. The power transmission belt according to claim 2, wherein the second yarn of the second material type is composed of PET.

6. The power transmission belt according to claim 2, wherein every third course of the individual courses has the first yarn of the first material type facing the top side of the plated knitted fabric, and wherein the individual courses between every third course has the second yarn of the second material type facing the top side of the plated knitted fabric.

7. The power transmission belt according to claim 2, wherein every third course of the individual courses has the second yarn of the second material type facing the top side of the plated knitted fabric, and wherein the individual courses between every third course has the first yarn of the first material type facing the top side of the plated knitted fabric.

8. The power transmission belt according to claim 2, wherein the first type of material and the second type of material have different thicknesses.

9. The power transmission belt according to claim 2, wherein every fifth course of the individual courses has the first yarn of the first material type facing the top side of the plated knitted fabric, and wherein the individual courses between every fifth course has the second yarn of the second material type facing the top side of the plated knitted fabric.

10. The power transmission belt according to claim 2, wherein every fifth course of the individual courses has the second yarn of the second material type facing the top side of the plated knitted fabric, and wherein the individual courses between every fifth course has the first yarn of the first material type facing the top side of the plated knitted fabric.

11. The power transmission belt according to claim 1, wherein the textile overlay comprises at least a third thread for stabilizing the textile overlay.

12. The power transmission belt according to claim 11, wherein the third thread is a polyurethane thread.

13. The power transmission belt according to claim 1, wherein the power transmission belt is configured as a flat belt, a V-belt, a V-ribbed belt, a toothed belt, a clutch belt, or an elevator belt.

14. The power transmission belt according to claim 1, wherein the plated knitted fabric is a weft-knitted fabric or a warp-knitted fabric.

15. The power transmission belt according to claim 14, wherein the weft-knitted fabric is a single jersey knitted fabric.

16. The power transmission belt according to claim 1, wherein the plated knitted fabric is provided with an adhesive agent on a side that faces the substructure surface.

17. The power transmission belt according to claim 16, wherein the adhesive agent comprises a dry lubricant, select from the group consisting of polytetrafluoroethylene (PTFE), polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), and mixtures thereof.

18. The power transmission belt according to claim 16, wherein the adhesive agent is electrically conductive.

Description

(1) The article according to the invention is preferably in the form of a band, strap, belt, hose, air-spring bellows (in particular an axial bellows or a cross-laid bellows), compensator, or multilayer material web. Preferably the article is in the form of a drive belt. In said form, the elastic main body comprises a top layer as the back of the belt and a substructure having a power transmission zone, with the top layer and/or the power transmission zone being provided with the textile overlay. The drive belt is particularly preferably configured as a flat belt, a V-belt, a V-ribbed belt, a toothed belt, a clutch belt, or an elevator belt.

(2) FIGS. 1 and 2 each show a textile overlay in the form of a single jersey knitted fabric in accordance with the prior art (DE 10 2012 105 510 A1).

(3) FIG. 1 shows the technical back of the weft-knitted fabric and FIG. 2 shows the technical face of the weft-knitted fabric. With this textile overlay, each side of the textile overlay is composed primarily of a single type of yarn.

(4) FIGS. 3 to 5 each show a textile overlay in the form of a single jersey knitted fabric for an article according to the invention.

(5) FIG. 3 shows the technical back of the weft-knitted fabric, in which courses 1, 3, and 5 are composed of a cotton yarn, while courses 2 and 4 are composed of a polyamide 6,6 yarn. Additionally depicted is a thin elastane yarn (a polyurethane thread) as the third yarn, parallel to the two yarn types in each of courses 1 to 5. FIG. 4 shows the technical face side of the same weft-knitted fabric. Here, courses 2 and 4 are composed of the cotton yarn, while courses 1, 3, and 5 are composed of the polyamide 6,6 yarn. Here again, an additional elastane yarn is provided in each of courses 1 to 5.

(6) FIGS. 3 and 4 show a knitted fabric plated in repeating alternation according to the present invention, in which the two types of yarn are arranged alternatingly on the top side and the bottom side of the fabric. This enables a precise adjustment of the desired properties of the article according to the invention, in particular to achieve an advantageous combination of durable protection against wear and noise reduction, especially under wet conditions.

(7) FIG. 5 shows a section of the knitted fabric for an article according to the invention, in which reference number 1 denotes the cotton yarn, reference number 2 denotes the polyamide 6,6 yarn, and reference number 3 denotes the elastane yarn.

(8) The invention will now be explained in greater detail with the help of examples.

EXAMPLES

Example 1 and Comparative Examples 1 to 4

(9) Belts having various flock coverings and textile overlays were tested for noise on a common rail motor with a 4-pulley V-ribbed belt drive, with and without the addition of water.

(10) The coefficient of friction was measured according to SAE J2432, version 2015.

(11) Wet belt noises were evaluated by running the engine of a car at idle speed, spraying the belt drive with water, and gradually switching on the consumers that increase the load on the belt drive (1. no consumers, 2. only light+window heating+seat heating+fan at full power, 3. air conditioning+previous consumers, 4. previous consumers+steering lock to lock). The noises were recorded and were rated subjectively according to the categories ?, o, and +.

(12) Dry belt noises (=misalignment noises) were examined on a test rig in which a pulley misalignment can be set, at a driving speed of 1000 min.sup.?1, a rotational irregularity of 17.5?, and a preload of 330 N/span. This arrangement will produce misalignment of a belt strand. The misalignment was varied from 0 to 2.6?. If a belt made no noise up to 2?, it was rated as +. If it only managed 1.5? without noise, the rating was o. If it made noise with less misalignment, the rating was ?.

(13) Wear resistance was ascertained by determining the loss of belt mass experienced by the belts on a diesel engine after 72 hours at idle speed with a high generator current draw (50 A), with the ambient temperature around the belt being kept at 110? C.

(14) The following table summarizes the results obtained for Example 1 according to the invention and for Comparative Examples 1 to 4:

(15) TABLE-US-00001 Comparative Comparative Comparative Comparative Example Example 1 Example 2 Example 3 Example 4 Example 1 Material PA6/PU BW/PU PA66/BW/PU BW/PA66/PU BW/PA66/PU Composition 82/18 91/9 49/45/6 43/50/7 43/50/7 [m %] Overlay Warp-knitted Weft-knitted Weft-knitted Weft-knitted Weft-knitted fabric fabric fabric fabric fabric Comments Plated PA on Plated BW on Double-plated outside outside Basis weight 155 225 305 230 240 (g/m.sup.2) Coefficient 1.6 1.3 1.2 1.8 1.5 of friction dry Coefficient 0.65 1.1 0.7 0.9 0.80 of friction wet Noise rating ? + + ? + dry Noise rating ? + ? + + wet Wear + ? + + + resistance Abbreviations: PA6 = polyamide 6; PA66 = nylon; BW = cotton; PU = polyurethane

(16) As is clear from the above table, for the example according to the invention, favorable wet and dry ratings for noise and good wear resistance were obtained.

(17) The V-ribbed belts of the example according to the invention were also rated favorably in terms of service life and cold resistance. Cold resistance was determined using a cold test according to the VDA [Verband der deutschen AutomobilindustrieAssociation of the German Automobile Industry], 2005, in which the belt was started 100 times at a temperature of ?40? C.