CN218893892U

CN218893892U - Steel cord structure for all-steel radial tire body

Info

Publication number: CN218893892U
Application number: CN202223164428.9U
Authority: CN
Inventors: 姚凤刚; 钱国平; 陈亮; 严华
Original assignee: Zhangjiagang City Junma Steel Cord Co ltd
Current assignee: Zhangjiagang City Junma Steel Cord Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-04-21
Anticipated expiration: 2032-11-28

Abstract

The utility model relates to the technical field of steel cords, in particular to a steel cord structure for an all-steel radial tire carcass, which comprises a steel cord, wherein the steel cord comprises a core strand, a middle strand and an outer strand, the diameter of the middle strand steel wire is the same as that of the outer strand steel wire, and the middle strand steel wire and the outer strand steel wire have the same twisting direction and twisting distance, so that six middle strand steel wires and twelve outer strand steel wires form line contact; because the six middle strand steel wires and the twelve outer strand steel wires are twisted with the same twisting distance and twisting direction, the six twisted middle strand steel wires and the twelve outer strand steel wires form wire contact, the stress concentration phenomenon generated between the middle strand steel wires and the outer strand steel wires is reduced, the broken wire phenomenon caused by stress concentration is avoided, the whole service life of the steel cord is prolonged, and the service life of the tire is prolonged.

Description

Steel cord structure for all-steel radial tire body

Technical Field

The utility model relates to the technical field of steel cords, in particular to a steel cord structure used in an all-steel radial tire body.

Background

The steel wire cord is mainly used for a carcass layer and a belt layer of an all-steel radial tire and a belt layer of a fiber radial tire, is one of main framework materials of the tire, is generally formed by twisting strands formed by monofilaments with different diameters, and is different in number of the monofilaments and structure of the cord according to different tire specifications and using positions.

The inner layer and outer layer of the structural cords of the original all-steel radial tire carcass are different in twisting distance, and the outer layer of the structural cords is 2 times of the inner layer of the structural cords, so that the inner layer and outer layer of monofilaments just form point contact in the twisting process of the cords, stress concentration is easy to occur in the use process of the tire, and the service life of the tire is reduced, and therefore, a steel cord structure used in the all-steel radial tire carcass is needed to solve the problems.

Disclosure of Invention

The present utility model proposes a steel cord structure for use in an all-steel radial tire carcass, comprising a steel cord comprising:

a core strand comprising a core strand wire;

the middle strand comprises six middle strand steel wires and is braided and twisted on the outer wall of the core strand;

the outer strand comprises twelve outer strand steel wires and is braided and twisted on the outer wall of the middle strand;

the diameter of the middle strand steel wire is the same as that of the outer layer strand steel wire, and the middle strand steel wire and the outer layer strand steel wire have the same twisting direction and twisting distance, so that six middle strand steel wires and twelve outer layer strand steel wires form line contact.

Preferably, the ratio of the diameter of the core strand wire to the diameter of the intermediate strand wire and the diameter of the outer strand wire is 1.1-1.2.

Preferably, the diameter of the core strand wire is 0.20-0.45mm.

Preferably, the diameters of the middle strand steel wire and the outer strand steel wire are each 0.175-0.40mm.

Preferably, the lay lengths of the intermediate strand steel wire and the outer strand steel wire are each 10.5mm.

Preferably, the twisting directions of the middle strand steel wire and the outer strand steel wire are Z twisting.

Preferably, the steel cord has a linear density of 3.73g/m.

Preferably, the carbon content of the core strand steel wire, the middle strand steel wire and the outer strand steel wire is 0.80% -0.85%.

Preferably, the tensile strength of the core strand wire is 5.0% -10.0% higher than that of the intermediate strand wire and the outer strand wire.

Preferably, the breaking force of the steel cord is 1520N.

Compared with the prior art, the utility model has the advantages that:

the steel cord adopts a 1+6+12 structure, and because the six middle strand steel wires and the twelve outer strand steel wires adopt the same twisting distance and twisting direction for twisting, the six twisted middle strand steel wires and the twelve outer strand steel wires form wire contact, the stress concentration phenomenon generated between the middle strand steel wires and the outer strand steel wires is reduced, the broken wire phenomenon caused by the stress concentration is avoided, the whole service life of the steel cord is prolonged, and the service life of the tire is prolonged.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the utility model will now be described, by way of example, with reference to the accompanying drawings.

Fig. 1 is a schematic cross-sectional view of a steel cord structure for use in an all-steel radial tire carcass according to the present utility model.

In the figure, 100, steel cord; 10. a core strand; 11. a core strand wire; 20. a middle strand; 21. a middle strand of steel wire; 30. an outer layer strand; 31. and an outer strand steel wire.

Detailed Description

For a better understanding of the technical content of the present utility model, specific examples are set forth below, along with the accompanying drawings.

As shown in connection with fig. 1, the present utility model provides a steel cord structure for use in an all-steel radial tire carcass, mainly comprising a core strand 10, a middle strand 20 and an outer layer strand 30.

The core strand 10 comprises a core strand steel wire 11, the middle strand 20 comprises six middle strand steel wires 21 and is braided and twisted on the outer wall of the core strand 10, the outer strand 30 comprises twelve outer strand steel wires 31 and is braided and twisted on the outer wall of the middle strand 20 to finally form a steel cord 100, the twisting pitches of the existing middle strand steel wires 21 and the outer strand steel wires 31 are different, and the twisting pitches of the outer strand steel wires 31 are 2 times of the twisting pitches of the middle strand steel wires 21, so that the outer strand steel wires 31 and the middle strand steel wires 21 just form point contact in the cord braiding and twisting process, stress concentration is easy to generate in the use process of the tire, and the service life of the tire is reduced.

Further, the core strand 11, the intermediate strand 21 and the outer strand 31 are all circular in cross section.

In order to avoid point contact during twisting of the outer layer strand 31 and the intermediate strand 21, as shown in connection with fig. 1, the diameter of the intermediate strand 21 is the same as the diameter of the outer layer strand 31, and the intermediate strand 21 and the outer layer strand 31 have the same lay direction and lay length.

In this way, in the process of twisting the outer layer strand wires 31 and the intermediate strand wires 21, the six intermediate strand wires 21 and the twelve outer layer strand wires 31 form line contact, so that the stress concentration phenomenon generated between the intermediate strand wires 21 and the outer layer strand wires 31 is reduced, and the service life of the tire is prolonged.

Alternatively, the twisting directions of the middle strand steel wire 21 and the outer strand steel wire 31 are Z-twisted, and the middle strand steel wire 21 and the outer strand steel wire 31 are uniformly arranged through a stranding process, so that the interaction stress between the middle strand steel wire 21 and the outer strand steel wire 31 is reduced.

Again, the lay lengths of the twisting of the intermediate strand 21 and the outer strand 31 were each 10.5mm.

As shown in fig. 1, the ratio of the diameter of the core strand wire 11 to the diameters of the intermediate strand wire 21 and the outer layer strand wire 31 is 1.1 to 1.2, specifically, the diameter of the core strand wire 11 is 0.20 to 0.45mm, the diameters of the intermediate strand wire 21 and the outer layer strand wire 31 are each 0.175 to 0.40mm, preferably, the diameter of the core strand wire 11 is 0.20mm, and the diameters of the intermediate strand wire 21 and the outer layer strand wire 31 are each 0.175mm.

Further, the carbon content of the core strand steel wire 11, the intermediate strand steel wire 21 and the outer layer strand steel wire 31 is 0.80% -0.85%, so that the core strand steel wire 11, the intermediate strand steel wire 21 and the outer layer strand steel wire 31 are all high carbon steel wires, and the overall strength of the steel cord 100 is improved by increasing the strength of the core strand steel wire 11, the intermediate strand steel wire 21 and the outer layer strand steel wire 31.

Thus, by reducing the diameters of the core strand wires 11, the intermediate strand wires 21, and the outer layer strand wires 31, the strength of the core strand wires 11, the intermediate strand wires 21, and the outer layer strand wires 31 is increased, the overall diameter of the steel cord 100 is reduced, and the overall strength of the steel cord 100 is improved.

Alternatively, the tensile strength of the core strand steel wire 11 is 5.0% -10.0% higher than that of the middle strand steel wire 21 and the outer strand steel wire 31, and since the core strand steel wire 11 is not twisted, the breakage phenomenon easily occurs when the core strand steel wire is pulled, and therefore, the tensile strength of the core strand steel wire 11 itself needs to be increased, and the breakage phenomenon is avoided.

Still further, the breaking force of the steel cord 100 is 1520N.

In combination with the above embodiments, the steel cord adopts a 1+6+12 structure, and since the six intermediate strand steel wires 21 and the twelve outer strand steel wires 31 are twisted with the same twisting pitch and twisting direction, the six intermediate strand steel wires 21 and the twelve outer strand steel wires 31 form line contact, so that the stress concentration phenomenon generated between the intermediate strand steel wires 21 and the outer strand steel wires 31 is reduced, the broken wire phenomenon caused by the stress concentration is avoided, and the service life of the tire is prolonged.

While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present utility model. Accordingly, the scope of the utility model is defined by the appended claims.

Claims

1. A steel cord structure for use in an all steel radial tire carcass, comprising a steel cord (100), said steel cord (100) comprising:

-a core strand (10) comprising a core strand wire (11);

-a middle strand (20) comprising six middle strand wires (21) and being braided to the outer wall of the core strand (10);

an outer strand (30) comprising twelve outer strand wires (31) and being braided around the outer wall of the intermediate strand (20);

wherein the diameter of the intermediate strand (21) is the same as the diameter of the outer layer strand (31), and the intermediate strand (21) and the outer layer strand (31) have the same lay direction and lay length such that six intermediate strands (21) and twelve outer layer strands (31) form a line contact.

2. Steel cord structure for use in an all-steel radial tire carcass according to claim 1, characterized in that the ratio of the diameter of the core strand wires (11) to the diameter of the intermediate strand wires (21), the outer layer strand wires (31) is 1.1-1.2.

3. Steel cord structure for use in an all-steel radial tire carcass according to claim 1, characterized in that the diameter of the core strand steel wire (11) is 0.20-0.45mm.

4. Steel cord structure for use in an all-steel radial tire carcass according to claim 1, characterized in that the diameter of both the intermediate strand wires (21) and the outer strand wires (31) is 0.175-0.40mm.

5. Steel cord structure for use in an all-steel radial carcass according to claim 1, characterized in that the lay lengths of the intermediate strand wires (21) and the outer strand wires (31) are each 10.5mm.

6. Steel cord structure for use in an all-steel radial tire carcass according to claim 1, characterized in that the lay directions of the intermediate strand wires (21) and the outer strand wires (31) are both Z-turns.

7. Steel cord structure for use in an all-steel radial tire carcass according to claim 1, characterized in that the wire cord (100) has a linear density of 3.73g/m.

8. Steel cord structure for use in an all-steel radial tire carcass according to claim 1, characterized in that the tensile strength of the core strand wires (11) is 5.0% -10.0% higher than the tensile strength of the intermediate strand wires (21), the outer layer strand wires (31).

9. Steel cord structure for use in an all-steel radial tire carcass according to claim 1, characterized in that the breaking force of the steel cord (100) is 1520N.