High-rubber-permeability steel cord and off-road tire

Abstract

The steel cord comprises a core strand and a plurality of outer strands twisted on the periphery of the core strand, each of the core strand and the outer strands is formed by weaving and twisting N monofilaments, and the value of N ranges from 2 to 6. According to the utility model, a coreless monofilament structure is adopted, a plurality of monofilaments are twisted into strands to form a more open structure, the diameter of each monofilament is greater than 0.3 mm, the monofilament is suitable for a belted layer of an OTR tire, the rigidity of a cord thread is improved, the protection of the belted layer is enhanced, and meanwhile, a single-layer structure replaces a multi-layer structure, so that the rubber permeation effect is better, and the service life of the tire is prolonged. The problem of center steel wire migration is well solved, and the safety of the tire becomes better.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel cord technical field, concretely relates to a kind of high permeation rubber steel cord and corresponding off-highway tire. BACKGROUND

[0002] Steel cord for reinforcing heavy-duty tire such as off-highway tire needs to have high strength, therefore, steel cord has multiple strands including multiple filaments to achieve high strength, forming corresponding OTR cord. Current OTR cord such as steel cord for rubber reinforcement and off-highway tire disclosed in patent number CN209854313U has core strand and outer strand both twisted by one core filament and six outer filaments, i.e. 1+6 structure, six outer filaments in outer layer tightly wrap one core filament, causing rubber not to permeate into core filament well. During driving of heavy-duty tire, OTR cord is subjected to very heavy load, which exerts strong force on core filament in core strand of OTR cord. If rubber is not attached well and anchoring is not firm, core filament migrates out of rubber layer, which may seriously pierce through outer layer rubber and be exposed, causing corrosion and water to permeate into rubber layer to corrode steel cord, seriously affecting service life and safety of tire. Moreover, multiple layer structure causes production cost to increase, and there is room for improvement. SUMMARY

[0003] The utility model discloses to avoid the deficiencies existing in prior art, provide a kind of high permeation rubber steel cord and corresponding off-highway tire.

[0004] The utility model discloses to avoid the deficiencies existing in prior art, provide a kind of high permeation rubber steel cord and corresponding off-highway tire.

[0005] In several embodiments, the outer strand is wrapped with an outer wrapping filament.

[0006] In several embodiments, the twist direction of the core strand, outer strand and outer wrapping filament is the same, and the twist direction of the steel cord is opposite to that of the outer wrapping filament.

[0007] In several embodiments, the twist pitch of the core strand and outer strand is between 12.5mm and 24mm, and the twist pitch of the steel cord is between 16mm and 32mm.

[0008] In several embodiments, the diameter of the filament is between 0.3mm and 0.4mm.

[0009] In several embodiments, the average tensile strength Ts of the filament is between 3800-2000×Ds and 4400-2000×Ds, and Ds is the diameter of the filament.

[0010] Also, a non-highway tire includes a carcass and a plurality of belt layers having the steel cord structure described above.

[0011] The effective effect of the utility model lies in:

[0012] The utility model discloses a coreless monofilament structure, and a plurality of monofilament is twisted into a strand, forms more open structure, and the monofilament diameter is greater than 0.3mm, is suitable for the belt layer of OTR tire, improves the rigidity of cord, strengthens the protection of belt layer, simultaneously, single layer structure replaces multilayer structure, has better impregnation effect, very good solution center steel wire migration problem, and tire safety becomes better. BRIEF DESCRIPTION OF DRAWINGS

[0013] The drawings described herein are only for the purpose of illustrating selected embodiments, and should not be considered as limiting the scope of the utility model.

[0014] Figure 1 The overall structure of the steel cord for rubber reinforcement in embodiment 1 is schematically shown. DETAILED DESCRIPTION

[0015] Below, the embodiment of the utility model is described in detail with reference to the drawings, in order that the purpose, technical scheme and advantage of the embodiment of the utility model are more clear, the technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment.

[0016] Therefore, the detailed description of the embodiment of the utility model provided in combination with the drawings below is not intended to limit the scope of the claimed utility model, but only represents the selected embodiment of the utility model, based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor are within the scope of the protection of the utility model.

[0017] The steel cord for rubber reinforcement mainly includes core strand 10, a plurality of outer strands 20 twisted around the core strand 10, and outer winding wire 30 wound around the outer strands 20, the core strand 10 and the outer strands 20 are twisted by N monofilaments 101, the value of N is between 2-6.

[0018] Among them, the twist direction of the core strand 10, the outer strand 20 and the outer winding wire 30 is the same, the twist direction of the steel cord is opposite to the twist direction of the outer winding wire 30, the twist pitch of the core strand 10 and the outer strand 20 is between 12.5mm to 24mm, and the twist pitch of the steel cord is between 16mm to 32mm.

[0019] Moreover, the diameter of the monofilament 101 is between 0.3 mm and 0.4 mm, and the average tensile strength Ts of the monofilament 101 is within the following range: 3800 - 2000×Ds < Ts < 4400 - 2000×Ds, where Ds is the diameter of the monofilament 101.

[0020] Example 1

[0021] As Figure 1 shown, in this embodiment, it includes a core strand 10 and 6 outer strands 20 twisted around the core strand 10. Both the core strand 10 and the outer strands 20 are first twisted by 3 monofilaments 101, the twist pitch is 16 mm, and the twist direction is S. Subsequently, 1 core strand 10 and 6 outer strands 20 are twisted, the twist direction is Z, and the twist pitch is 20 mm. Subsequently, the outer wrapping wire is wound around the outer strands 20, the twist pitch is 5 mm, and the twist direction is S. The diameter of the monofilament 101 is 0.32 mm, and the diameter of the outer wrapping wire is 0.15 mm.

[0022] Comparative Example 1

[0023] Such as the structure of the steel cord for rubber reinforcement disclosed in the patent No. CN209854313U in the background art.

[0024] The steel cords in Example 1 and Comparative Example 1 are combined with rubber to form rubberized samples. After intercepting 200 mm in length and sealing and clamping both ends, gas with a set pressure is passed through one end (input end). After a certain period of time, the pressure at the other end (output end) is detected. The ratio of the pressure at the output end to the pressure at the input end is the air permeability.

[0025] According to the above test method, the obtained data are shown in the following table:

[0026]

[0027] According to the above test results, it can be known that the steel cord in this embodiment has a lower air permeability, indicating less gas passing through, better anti-gel penetration performance, a significant improvement in corrosion resistance, and a lower linear density.

[0028] All the ways described herein can be carried out in any suitable order. Any and all examples used, or the exemplary language provided herein (such as "for example") are only used to better illustrate the present invention and are not a limitation on the scope of the present invention, unless otherwise claimed. The language in the detailed description should not be construed as indicating any essential elements for practicing the present invention that are not claimed.

[0029] The utility model describes the preferred implementation scheme, including the best way of the utility model that the utility model person knows carries out the utility model. Of course, the skilled person in the art can obviously see the change of these preferred implementation schemes. The utility model person expects that the skilled person can use the change appropriately, and the utility model person points out that the utility model can be implemented according to other ways different from the specific above-mentioned in the text. Therefore, the utility model includes all improvements included in the utility model main idea and scope defined by the claims. Moreover, unless otherwise stated or obviously contradictory in content, the utility model includes any of the above factors and all possible changes thereof.

Claims

1. A high osmosis gum steel cord, characterized in that, The steel cord comprises a core strand (10) and a plurality of outer strands (20) twisted around the core strand (10), each of the core strand (10) and the outer strands (20) being twisted from N monofilaments (101), the value of N being 3; the average tensile strength Ts of the monofilaments (101) being between 3800-2000 x Ds < Ts < 4400-2000 x Ds, Ds being the diameter of the monofilaments (101).

2. A high osmosis adhesive steel cord according to claim 1, characterized in that, The outer strands (20) are wrapped with an outer wrapping wire (30).

3. A high osmotic gluey steel cord according to claim 2, characterized in that The twist direction of the core strand (10), the outer strands (20) and the outer wrapping wire (30) is the same, the twist direction of the steel cord being opposite to the twist direction of the outer wrapping wire (30).

4. A high osmosis glue steel cord according to claim 1, characterized in that, The twist pitch of the core strand (10) and the outer strands (20) is between 12.5 mm and 24 mm, the twist pitch of the steel cord being between 16 mm and 32 mm.

5. A high osmosis glue steel cord according to claim 1, characterized in that, The diameter of the monofilaments (101) is between 0.3 mm and 0.4 mm. ​ 6. Off-road tire, characterized in that, The off-the-road tire comprises a carcass and a plurality of belt layers, the belt layers comprising the steel cord according to any one of claims 1-5.

Images