High-rubber-permeation compact steel cord and tire

Abstract

The utility model discloses a high-rubber-permeation compact type steel cord and a tire, which comprise a core steel wire formed by weaving and twisting two or three monofilaments with the diameter of d1, and 15 steel layer wires are twisted on the periphery of the core steel wire; the layer filaments comprise middle layer filaments and outer layer filaments, the middle layer filaments are composed of five monofilaments with the diameter of d2, the outer layer filaments are composed of ten monofilaments with the diameter of d3, and d2 is larger than d1 and smaller than d3; the outer-layer filaments have two diameters, namely, five outer-layer filaments are d3-1, and five outer-layer filaments are d3-2; and the d3-1 and the d3-2 of the outer-layer filaments are alternately distributed. Compared with the prior art, the rubber permeation rate of the steel cord can be effectively improved, the corrosion resistance is better, the safety of the tire is higher, and the steel cord can be widely applied to carcass plies of radial tires of medium-sized and heavy trucks and passenger cars.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel cord technical field especially relates to a high tightness rubber tight type steel cord and tire. BACKGROUND

[0002] Such steel cords are known in the art, in which all steel filaments are twisted together with the same twist direction and the same twist pitch; since such steel cords can accommodate a large number of steel filaments in a limited cross-sectional area, thereby forming a tight cross-sectional structure, such steel cords are referred to as "tight type steel cords".

[0003] The existing patent CN 212452056 U discloses a 1×d1+14×d2 CC cord, which includes a core filament having a core filament diameter, and 14 layer filaments having a layer filament diameter and twisted around the core filament. The 14 layer filaments are arranged in a manner that an intermediate layer composed of 5 steel filaments and an outer layer composed of 9 steel filaments. The cross-section of the cord of this structure is a very unstable quadrilateral structure, and the permeability of rubber is greatly affected.

[0004] The existing patent CN 103298996 A discloses a steel cord for reinforcing elastomeric products, which has a core filament having a core filament diameter D0, and 15 layer filaments around the core filament, an intermediate layer composed of 5 filaments having an intermediate layer diameter D1, and an outer layer composed of 10 filaments having an outer layer diameter D2. The cross-section of this steel cord is a typical regular hexagon, and the structure is relatively stable. However, the core strand of this structure is a single steel filament, which has the problem of insufficient elongation during repeated bending, limiting the performance of breaking and fatigue, and the tire reinforced by this steel cord cannot truly improve the quality. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a high tightness rubber tight type steel cord and tire, which effectively improves the rubber penetration rate of the steel cord, has better corrosion resistance, and further ensures higher safety of the tire, so as to solve the problems in the above background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A high tightness rubber tight type steel cord, which includes a core steel filament twisted by 2 or 3 filaments having a diameter d1, and 15 steel layer filaments twisted around the outer periphery of the core steel filament; the layer filaments include intermediate layer filaments and outer layer filaments, the intermediate layer filaments are composed of 5 filaments having a diameter d2, the outer layer filaments are composed of 10 filaments having a diameter d3, and d1

[0008] Preferably, the outer layer filaments have two diameters, 5 filaments have a diameter d3-1, and 5 filaments have a diameter d3-2.

[0009] Preferably, the outer filaments d3-1 and d3-2 are alternately distributed.

[0010] Preferably, the middle layer yarn and the outer layer yarn have the same twist direction and the same twist pitch.

[0011] Preferably, the core wire and the outer layer wires have the same twist direction, and the twist pitch is 40% to 90% of the outer layer twist pitch.

[0012] Preferably, the maximum rubber penetration rate of the high-penetration, tightly packed steel cord is 100%.

[0013] A tire includes a carcass ply and highly infiltrated, tightly packed steel cords located within the carcass ply, the tire including but not limited to medium to heavy-duty truck and bus radial tires.

[0014] The beneficial effects of this utility model are:

[0015] This invention relates to a high-adhesion, tightly packed steel cord and tire, which effectively increases the adhesive penetration rate of the steel cord, improves its corrosion resistance, and thus ensures higher tire safety. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the high-permeability adhesive-coated tight steel cord in the embodiment.

[0017] Figure 2 It is a tightly packed steel cord with high-permeability adhesive and three core steel wires in the middle.

[0018] In the diagram: 100 - High-permeability adhesive compact steel cord, 101 - Core steel wire, 102 - Middle layer wire, 103 - Outer layer wire. Detailed Implementation

[0019] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1: As Figure 1 As shown, the high-permeability, tightly packed steel cord 100 includes a core steel wire 101 formed by twisting two monofilaments with a diameter of d1. The core steel wire 101 has 15 steel layer wires twisted around its outer periphery. The layer wires include an intermediate layer wire 102 and an outer layer wire 103. The intermediate layer wire 102 consists of five monofilaments with a diameter of d2, and the outer layer wire 103 consists of ten monofilaments with a diameter of d3, where d1 < d2 < d3. The intermediate layer wire 102 and the outer layer wire 103 have the same twist direction and the same twist pitch, thus forming a tightly packed structure.

[0021] The high-permeability adhesive compact steel cord 100 of this embodiment includes the following preparation steps:

[0022] (1) The raw material wire rod is subjected to surface treatment, and then subjected to rough drawing to draw it to a diameter of 3.0-3.5 mm. Subsequently, the hardening phenomenon generated in the process is eliminated by normalizing treatment. Then, the wire is subjected to intermediate drawing to obtain dry drawn steel wire with a diameter of 1.0-2.5 mm.

[0023] (2) The dry drawn steel wire is subjected to annealing treatment, and then subjected to electroplated brass operation to obtain brass plated steel wire.

[0024] (3) The brass plated steel wire is subjected to wet drawing to produce three kinds of wet drawn steel wires with diameters of d1, d2 and d3.

[0025] (4) Two wet drawn core steel wires 101 with a diameter of d1 are twisted into a core strand. Five wet drawn steel wires with a diameter of d2 are selected as intermediate layer wires 102, and the core steel wire 101 and the five intermediate layer wires 102 are twisted into a center strand by a twisting machine. Ten wet drawn steel wires with a diameter of d3 are selected as outer layer wires 103, and the center strand and the ten outer layer wires 103 are twisted into a steel cord with a 2+5+10 structure.

[0026] The steel cord with a high penetration rubber compact structure of the embodiment comprises two core steel wires 101 with a diameter of 0.175 mm twisted into a core strand, and a plurality of layer wires with the same twist direction and the same twist pitch twisted around the core strand, the layer wires comprising intermediate layer wires 102 and outer layer wires 103, the intermediate layer wires 102 comprising five intermediate layer filaments with a diameter of 0.23 mm, and the outer layer wires 103 comprising ten outer layer filaments with a diameter of 0.25 mm. The twist pitch of the layer wires is 16 mm, the twist pitch of the core strand is 8, and the twist direction is Z twist.

[0027] Table 1 below summarizes the influence of the steel cord measured according to the first embodiment of the utility model.

[0028] Table 1

[0029] Maximum Minimum Steel cord diameter (mm) 1.175 1.148 Breaking force (N) 2312 2265 Linear density (g / m) 5.884 5.872 Fatigue test (times) 57589 57228 Penetration rate (%) 100% 95% Breaking elongation (%) 2.52 2.21

[0030] As can be seen from Table 1, Figure 1 It can be seen that: the high penetration rubber compact steel cord 100 has gaps between each filament, so that the rubber can fully penetrate and embed around each steel cord filament during vulcanization, the rubber penetration rate is greatly improved, and the adhesion between the steel cord and the rubber is effectively improved. And because of this structure, the rubber can fully penetrate into the pores of each filament of the steel cord, so the rubber is tightly wrapped around each filament, and the dense structure formed by the rubber wrapping can effectively prevent water from entering, improve the corrosion resistance of the cord, enhance the adhesion retention of the steel cord, and thus effectively prolong the service life of the tire.

[0031] The above-mentioned embodiments only illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A high osmosis gum compacted steel cord, characterized in that: The core steel wire (101) twisted by 2 or 3 monofilaments with diameter d1, the 15 layer steel filaments twisted outside the core steel wire (101), the layer filaments including intermediate layer filaments (102) and outer layer filaments (103), the intermediate layer filaments (102) consisting of 5 monofilaments with diameter d2, the outer layer filaments (103) consisting of 10 monofilaments with diameter d3, and d1 < d2 < d3.

2. A high osmolality glue compacted steel cord as claimed in claim 1, characterized in that: The outer layer filaments (103) have two diameters, 5 of which are d3-1 and 5 of which are d3-2.

3. A high osmolality glue compacted steel cord as claimed in claim 2, characterized in that: The d3-1 and d3-2 of the outer layer filaments (103) are alternately distributed.

4. A high osmolality glue compacted steel cord as claimed in claim 1, wherein: The intermediate layer filaments (102) and outer layer filaments (103) have the same twist direction and the same twist pitch.

5. A high osmolality glue compacted steel cord as claimed in claim 1, wherein: The core steel wire (101) and layer steel filaments have the same twist direction and the twist pitch is 40% to 90% of the outer layer twist pitch.

6. A high osmolality glue compacted steel cord as claimed in claim 1, wherein: The high-permeation tight steel cord (100) has a maximum rubber permeation rate of 100%.

7. A tire characterized by: The high-permeation tight steel cord (100) as claimed in any one of claims 1 to 6 is included in the carcass ply.

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