Belt

Abstract

The present invention concerns a belt (1), with a belt body (10) which extends substantially in a longitudinal direction and substantially comprises a flexible material, wherein at least one tensioning member (13), preferably a plurality of tensioning members (13), is at least substantially embedded in the belt body (10) in the longitudinal direction and at least substantially surrounded by the flexible material of the belt body (10), and with a coating (14) which is arranged directly on the belt body (10) from a drive side (11) of the belt (1), wherein the coating (14) comprises a fabric layer (14b). The belt (1) is characterized in that facing the belt body (10), the coating (14) has a first film (14a) which is arranged between the belt body (10) and the fabric layer (14b) and is designed to isolate the belt body from the fabric layer (14b).

Claims

1.-10. (canceled)

11. A belt comprising a belt body which extends substantially in a longitudinal direction and substantially comprises a flexible material; wherein at least one tensioning member is at least substantially embedded in the belt body in the longitudinal direction and the at least one tensioning member is at least substantially surrounded by the flexible material of the belt body; wherein a coating is arranged directly on the belt body from a drive side of the belt, and wherein the coating comprises a fabric layer; and, wherein facing the belt body, the coating has a first film which is arranged between the belt body and the fabric layer and is designed to isolate the belt body from the fabric layer.

12. The belt as claimed in claim 11, wherein the at least one tensioning member is a plurality of tensioning members.

13. The belt as claimed in claim 11, wherein the flexible material of the belt body comprises polyurethane, and wherein the material of the first film comprises polyurethane.

14. The belt as claimed in claim 13, wherein the flexible material of the belt body and the material of the first film comprise the same polyurethane.

15. The belt as claimed in claim 13, wherein the flexible material of the belt body and the material of the first film consist of the same polyurethane.

16. The belt as claimed in claim 11, wherein the flexible material of the belt body consists of polyurethane, and wherein the material of the first film consists of polyurethane.

17. The belt as claimed in claim 16, wherein the flexible material of the belt body and the material of the first film consist of the same polyurethane.

18. The belt as claimed in claim 11, wherein the material of the fabric layer comprises polyamide.

19. The belt as claimed in claim 11, wherein the material of the fabric layer consists of polyamide.

20. The belt as claimed in claim 11, wherein the first film is arranged directly adjacent to the fabric layer.

21. The belt as claimed in claim 11, wherein the coating further comprises a second film which is arranged facing away from the first film relative to the fabric layer, and is configured to cover the fabric layer towards the outside.

22. The belt as claimed in claim 21, wherein the second film comprises polyurethane.

23. The belt as claimed in claim 21, wherein the second film consists of polyurethane.

24. The belt as claimed in claim 21, wherein the second film comprises polyethylene.

25. The belt as claimed in claim 21, wherein the second film consists of polyethylene.

26. The belt as claimed in claim 21, wherein the second film is arranged directly adjacent to the fabric layer.

27. The belt as claimed in claim 11, wherein the drive side of the belt has a profiling oriented in a direction transverse to a movement direction of the belt.

28. The belt as claimed in claim 27, wherein the profiling is teeth oriented in the direction transverse to a movement direction of the belt.

29. The belt as claimed in claim 11, wherein the drive side of the belt has a profiling oriented in a movement direction of the belt.

30. The belt as claimed in claim 29, wherein the profiling is ribbing oriented in the movement direction of the belt.

Description

[0029] Two exemplary embodiments and further advantages of the invention will be discussed below in conjunction with the following figures. The drawing shows:

[0030] FIG. 1 a schematic longitudinal section through a belt;

[0031] FIG. 2 an illustration of a detail of FIG. 1;

[0032] FIG. 3 a known two-layer structure of a known belt;

[0033] FIG. 4 a two-layer structure according to the invention of a belt according to the invention in a first exemplary embodiment; and

[0034] FIG. 5 a three-layer structure according to the invention of a belt according to the invention in a second exemplary embodiment.

[0035] The description of the above-mentioned figures is given in Cartesian coordinates with a longitudinal direction X, a transverse direction oriented perpendicularly to the longitudinal direction X, and a vertical direction Z oriented perpendicularly both to the longitudinal direction X and also to the transverse direction. The longitudinal direction X may also be referred to as the depth X, the transverse direction as the width, and the vertical direction Z as the height Z.

[0036] FIG. 1 shows a schematic longitudinal section through a belt 1. FIG. 2 shows an illustration of a detail of FIG. 1.

[0037] The belt 1 represents a generally known belt 1 configured as a toothed belt 1. The toothed belt 1 has a belt body 10 which consists of polyurethane (PU). The toothed belt 1 has a first belt side 11 formed as a drive side 11, in order to cooperate with drive rollers, guide rollers and deflection rollers (not shown) of a drive system and to transmit forces. For this, the drive side 11 has a profiling 15 in the form of teeth 15. Opposite the drive side 11 in height Z, the toothed belt 1 has a second belt side 12. Several tensioning members 13 are arranged inside the belt body 10 in the form of steel cables 13 running in the longitudinal direction X and formed from individual steel strands. The steel cables 13 serve to transmit tension forces in the longitudinal direction X as the movement direction of the toothed belt 1.

[0038] The outer surface of the drive side 11 of the toothed belt 1 is formed by a coating 14 which is produced separately as a laminate. The belt body 10 and steel cables 13 embedded therein are applied to the laminated coating 14 and hardened, so that a substance-bonded connection forms between the laminated coating 14 and the belt body 10, leading to an integral toothed belt 1, see for example FIG. 2.

[0039] FIG. 3 shows a known two-layer structure of a known belt 1 such as the toothed belt 1 described above. A fabric layer 14b and a film 14c as an outer film 14c are used, which are produced separately and combined into a two-layer structure by being laid one on top of the other. The two-layer structure is then brought into the desired form corresponding to the arrangement of the profiling 15.

[0040] Such coatings 14 for toothed belts 1 are known. In this case, the fabric layer 14b directly adjoins the belt body 10 so that a direct contact can occur between the steel cables 13 and the fabric layer 14b if the material of the belt body 10 is unintentionally penetrated by a steel cable 13 at fault points. This direct contact between the fabric layer 14b and the steel cables 13 may allow moisture, which can enter the fabric layer 14b from the side in the transverse direction and propagate further inward in the transverse direction inside the fabric layer 14b, to also reach the fault points and attack and damage the steel cables 13 there e.g. by corrosion.

[0041] FIG. 4 shows a two-layer structure according to the invention of a belt 1 according to the invention, such as the toothed belt 1 described above, in a first exemplary embodiment. In order to avoid the above-mentioned contact between the steel cables 13 and the coating 14 at the fault points, in this exemplary embodiment the coating 14 comprises not only the above-mentioned fabric layer 14b but also a first film 14a as an inner film 14a which is arranged between the fabric layer 14b and the belt body 10 or steel cables 13. The inner film 14a thus lies between the steel cables 13 and fabric layer 14a even at the fault points, so that even on occurrence of undesirable fault points, direct contact between the steel cables 13 and fabric layer 14b can be avoided. This may prevent the transfer of moisture from the fabric layer 14b to the steel cables 13, and hence this cause of the generation of corrosion of steel cables 13 may be excluded.

[0042] The belt body 10 and the inner film 14a here comprise the same material, e.g. polyurethane (PU), so that the previously described effect may be achieved without changing the material properties in the region between the fabric layer 14b and the belt body 10. The fabric layer 14b may preferably be made from polyamide (PA).

[0043] FIG. 5 shows a three-layer structure according to the invention of a belt 1 according to the invention, such as the toothed belt 1 described above, in a second exemplary embodiment. The toothed belt 1 according to the second exemplary embodiment corresponds to the toothed belt 1 of the first exemplary embodiment, with the difference that the coating 14 has a second film 14c as an outer film 14c pointing towards the outside of the belt body 10. This allows protection of the fabric layer 14b on the outside towards the drive side 11. The outer film 14c may consist of polyurethane (PU) or of polyethylene (PE).

LIST OF REFERENCE SIGNS (PART OF THE DESCRIPTION)

[0044] X Longitudinal direction

[0045] Y Transverse direction; width

[0046] Z Vertical direction; height

[0047] 1 Belt; toothed belt

[0048] 10 (PU) belt body

[0049] 11 First belt side; drive side

[0050] 12 Second belt side

[0051] 13 Tensioning member; steel cables

[0052] 14 Coating

[0053] 14a First (PU) film; (PU) inner film

[0054] 14b (PA) fabric layer

[0055] 14c Second (PE/PU) film; (PE/PU) outer film

[0056] 15 Profiling or teeth of first belt side 11