CN100537893C

CN100537893C - The main cord all-steel cord of rubber belt track

Info

Publication number: CN100537893C
Application number: CNB2004800165812A
Authority: CN
Inventors: 增渕英树
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2003-06-13
Filing date: 2004-06-11
Publication date: 2009-09-09
Anticipated expiration: 2024-06-11
Also published as: WO2005001194A1; KR20060023988A; CN1806077A; JP2005002515A

Abstract

The invention provides a kind of main cord all-steel cord of rubber belt track, do not reduce cord and cut off load and just can make rubber be immersed in the core silk surface of core strand, thereby the core silk of inhibition core strand protrudes from rubber component.The core strand (22) of all-steel cord (10) is by 1 core silk (22C) and stranded 5 outer mantle fiber (22S) formations around this core silk (22C).Stranded around the core strand (22) have 6 overcoat strands (26).Thus, because outer mantle fiber (22S) gap to each other is enough wide, rubber component is to the dipped type height of core silk (22C), thereby, can realize suppressing the all-steel cord (10) of the protrusion of core silk (22C).

Description

The main cord all-steel cord of rubber belt track

Technical field

The present invention relates to the all-steel cord that a kind of main cord that is built in rubber belt track is used.

Background technology

Reinforcing material as non junction ring-shaped rubber crawler belt uses all-steel cord more.And for improving the bearing of all-steel cord, more the structure of all-steel cord adopts and improves 7 * 7 structures that cord cuts off load.

As 7 * 7 structures for example is that the disclosed all-steel cord 80 as shown in Figure 5 of Japanese kokai publication hei 11-093087 communique is such, dispose the structure of 6 overcoat strands 86 around 1 core strand 82, the core silk 86C of the core silk 82C of formation core strand 82 and the diameter of outer mantle fiber 82S and formation overcoat strand 86 and the diameter of outer mantle fiber 86S are all identical.

But, in structure as shown in Figure 5, because it is narrow to constitute the outer mantle fiber 82S gap each other of core strand 82, so rubber is low to the dipped type of the core silk 82C of formation core strand 82.For this reason, when the rubber belt track that will have this all-steel cord 80 was used to use, by imposed load repeatedly, such shortcoming appears in its result: the core silk 82C that constitutes core strand 82 protruded to the face side of rubber belt track from the end of all-steel cord 80.And, be starting point with the silk that exposes from this surface, water immerses from the outside and propagates, and causes corrosion fatigue, thereby causes the all-steel cord fracture.

In addition, even same problem also appears in the all-steel cord of disclosed structure in Japanese kokai publication hei 06-240590 communique, Japanese kokai publication hei 08-027685 communique, Japanese kokai publication hei 01-104888 communique and the Japanese kokai publication hei 09-111679 communique.

As shown in Figure 6, as its countermeasure, TOHKEMY 2001-20188 communique discloses such all-steel cord 90, and the diameter of the core silk 92C by making core strand 92 suppresses the protrusion of core silk 92C greater than the diameter of the outer mantle fiber 92S of core strand 92.In addition, in Fig. 6, the diameter of the core silk 96C of overcoat strand 96 is also greater than the outer mantle fiber 96S of overcoat strand 96.

But when forming disclosed as shown in Figure 6 the structure of TOHKEMY 2001-20188 communique, core silk 92C and core silk 96C diameter are big.For this reason, the problem that the weight of all-steel cord 90 self increases appears.In addition,, when then using rubber belt track to make rubber, be difficult to bending machining, and need do not produce in seam portion in addition and make such problem with peeling off with this all-steel cord 90 because the rigidity of all-steel cord 90 becomes big.In addition, the silk that use is wound in the bobbin of same shape is used as core silk and outer mantle fiber, because the difference of filament diameter and the length difference of being reeled, thereby when using the different silk of diameter, have the little silk of diameter and produce surplus (loss), the unhelpful such problem of cost of increase.

Summary of the invention

In view of the foregoing, purpose of the present invention just provides a kind of all-steel cord, it is used in rubber belt track, stranded many overcoat strands around the core strand, the cut-out load that this all-steel cord does not reduce cord just can make rubber be immersed in the surface of the core silk of core strand, thereby the core silk that suppresses the core strand protrudes from rubber component.

The invention of technical scheme 1 is a kind of all-steel cord, this all-steel cord is stranded many overcoat strands around the core strand of 2 layers of twisting that are made of multi-filament, wherein, described core strand is to be made of mantle fiber outside core and stranded around this core 5 the 1st, and this core is made of 1 or many 1st core silks; Described overcoat strand is to be made of mantle fiber outside 1 the 2nd core silk and stranded around this core silk 6 the 2nd.

When the radical of the core silk that constitutes the core strand is many, though this core silk each other by stranded, from the easiness and the consideration of intensity (tenacity) aspect of making, is desirable.In addition, in this case, can supply with the silk of formation core strand and the outer mantle fiber of formation overcoat strand simultaneously and make all-steel cord, also can supply with and make core strand well in advance, supply with the silk that becomes the overcoat strand simultaneously and make all-steel cord.In addition, make the core silk that constitutes the core strand be many, and stranded mutually situation under, consider that preferably the radical of core silk is 1 owing to increase a stranded operation from the productivity aspect.

The radical that constitutes the outer mantle fiber of core strand is 4 or 4 when following, is easy to generate skew in the time of twisting, in addition, is easy to generate intensity during bearing load and reduces.

In addition, can omit silk after the coating.

As described above, in technical scheme 1 described invention,, the radical of the outer mantle fiber that constitutes the core strand becomes 5 owing to having reduced 1 than in the past, and can realize not reducing cord cut-out load and can make rubber be immersed in the core silk surface of core strand.Thereby, can realize suppressing all-steel cord that this core silk protrudes, that rubber strengthens usefulness.

The invention of technical scheme 2 is characterised in that: constitute the diameter d k of core of described core strand and the relation that the diameter d s that constitutes the outer mantle fiber of described core strand satisfies 1.1 * ds 〉=dk 〉=ds.

Core is made of 1 or many core silk.Under the situation that core is made of many core silks, the diameter d k of core is identical with the diameter of projected footprint on the cord length direction.

By satisfying the relation of dk 〉=ds, make rubber fully immerse the outer mantle fiber gap to each other that constitutes the core strand easily, thereby, make rubber fully arrive core easily.In addition, by satisfying the relation of 1.1 * ds 〉=dk, when producing skew, bearing load in the time of can preventing to twist with the fingers the core strand intensity takes place and reduce.

The invention of technical scheme 3 is characterised in that making the direction of lay of the outer mantle fiber that constitutes described core strand and the direction of lay of the outer mantle fiber that constitutes described overcoat strand is mutual opposite direction.

Thus, owing to can reduce the contact area of core strand and overcoat strand, so can improve the dipped type of rubber to core strand surface.

Because the present invention is above-mentioned formation, thereby can provide a kind of all-steel cord, it is used in rubber belt track, stranded many overcoat strands around the core strand, the cut-out load that this all-steel cord does not reduce cord just can make rubber be immersed in the core silk surface of core strand, thereby the core silk that suppresses the core strand protrudes from rubber component.

Description of drawings

Fig. 1 is the side view when making the all-steel cord of the 1st embodiment as the rubber belt track of main cord.

Fig. 2 is the sectional view of the rubber belt track that obtains through the operation of Fig. 1.

Fig. 3 is the sectional view of formation of the all-steel cord of expression the 1st embodiment.

Fig. 4 is the sectional view of formation of the all-steel cord of expression the 2nd embodiment.

Fig. 5 is a sectional view of representing the formation of all-steel cord in the past.

Fig. 6 is a sectional view of representing the formation of all-steel cord in the past.

The specific embodiment

Below, exemplify embodiment, embodiments of the present invention are described.

(the 1st embodiment)

At first, the 1st embodiment is described.As Fig. 1～shown in Figure 3, the all-steel cord 10 of the 1st embodiment is to be embedded in the all-steel cord that is used as reinforcement (main cord) on the length direction of rubber belt track 16 (with reference to Fig. 1, Fig. 2).This all-steel cord 10 by 1 core strand 22 and stranded in core strand 22 around 6 overcoat strands 26 constitute.Rubber belt track 16 forms the outstanding band shape that joint is arranged in two ends that makes all-steel cord 10 at first, in order to form the non junction ring-type, fills new elastomeric material 16a and carries out sulfidization molding under the state of the two ends overlap joint that makes all-steel cord 10.In addition, 16b is the arbor that is embedded in simultaneously in the rubber, and 16c is the plate tooth that is formed at outer circumferential side.

As shown in Figure 3, core strand 22 by 1 core silk 22C and stranded in this core silk 22C around 5 outside mantle fiber 22S constitute.Any of overcoat strand 26 all be by 1 core silk 26C and stranded in this core silk 26C around 6 outside mantle fiber 26S constitute.

Like this, in the present embodiment, the outer mantle fiber 22S of formation core strand 22 compares 1 of 6 minimizing in the past and is 5, thus, can guarantee to constitute the outer mantle fiber 22S gap to each other of core strand 22 fully.Thereby, when making rubber belt track 16, make rubber component from around when being immersed into all-steel cord 10, rubber component can fully immerse from the outer mantle fiber 22S gap to each other that constitutes core strand 22, the amount that can make rubber component arrive the surface of the core silk 22C that constitutes core strand 22 is enough amounts.Thereby, even use the rubber belt track 16 of built-in this all-steel cord 10, also can suppress the protrusion of core silk 22C as main cord.

(the 2nd embodiment)

Next, the 2nd embodiment is described.In the 2nd embodiment, the identical Reference numeral of inscape mark to identical with the 1st embodiment omits its explanation.

As shown in Figure 4, the all-steel cord 30 of the 2nd embodiment by 1 core strand 32 and stranded in core strand 32 around 6 overcoat strands 26 constitute.

The core 32C of core strand 32 is made of mutual 3 stranded core silk 32C1～C3.Thus, can increase the surface area of core 32C, can further improve the dipped type of rubber core 32C.In addition, in this case, the diameter d k of core 32C (with reference to Fig. 4) is identical with the diameter of the projected footprint of core 32C on the cord length direction.

More than, exemplify embodiment embodiments of the present invention are described, but these embodiment only are examples, can in the scope that does not break away from main idea, carry out various changes.In addition, interest field of the present invention also is not limited to above-mentioned embodiment certainly.

(experimental example)

Make respectively 4 kinds of all-steel cords as the rubber belt track that strengthens with all-steel cord, carry out endurancing, these 4 kinds of all-steel cords are the all-steel cord 10 (embodiment 1) that illustrates in above-mentioned the 1st embodiment, the all-steel cord 30 (embodiment 2) that illustrates in above-mentioned the 2nd embodiment, the all-steel cord (comparative example) that is made of 1 core strand and 4 overcoat strands, all-steel cord (example in the past) in the past.Experimental condition is with rubber belt track walking 200 hours.Expression embodiment 1, embodiment 2, comparative example and routine in the past core strand structure, filament diameter (the core filament diameter dc of core strand, the outer mantle fiber ds of core strand, the core diameters dk of core strand) and result of the test in table 1.

[table 1]

	Embodiment 1	Embodiment 2	Comparative example	Routine in the past
	Embodiment 1	Embodiment 2	Comparative example	Routine in the past	Core strand structure	1+5	3+5	1+4	1+6

The core filament diameter dc (mm) of core strand	0.34	0.16	0.34	0.34
The core filament diameter dc (mm) of core strand	0.34	0.16	0.34	0.34	The overcoat filament diameter ds (mm) of core strand	0.34	0.34	0.34	0.34
The core diameter dk (mm) of core strand	0.34	0.34	0.34	0.34	The overcoat filament diameter ds (mm) of core strand	0.34	0.34	0.34	0.34
The core diameter dk (mm) of core strand	0.34	0.34	0.34	0.34	The protrusion radical (root) of the core of core strand	0	0	0	7
Rate of utilization of strength (%)	90	88	72	90	The protrusion radical (root) of the core of core strand	0	0	0	7

The evaluation of endurancing is to use the core silk protrusion quantity and the rate of utilization of strength that protrude from the surface or the back side of rubber belt track to estimate.

At this, rate of utilization of strength U obtains with following formula, and the big more expression of numerical value is good more.

U=(fracture strength of all-steel cord)/(summation of the fracture strength of the silk of use)

Show from table 1, in the foregoing description 1 and embodiment 2, rate of utilization of strength is descended, promptly do not make and cut off load decline, just can reduce the protrusion quantity of core silk.

In above-mentioned comparative example, though good on the protrusion radical this point of core silk, rate of utilization of strength descends.Consideration may be owing to too reduce the cause of the radical of the outer mantle fiber that constitutes the core strand.

In above-mentioned example in the past, the protrusion radical of core silk is many, for difference is estimated.Its reason may be that the outer mantle fiber gap to each other of formation core strand is narrow, and rubber can not fully arrive the cause of the core silk that constitutes the core strand.

Claims

1. the main cord all-steel cord of a rubber belt track, stranded many overcoat strands around the core strand of 2 layers of twisting that constitute by multi-filament, wherein,

Described core strand be by core and stranded in this core around 5 the 1st outside mantle fiber constitute; This core is made of 1 or many 1st core silks;

Described overcoat strand is to be made of mantle fiber outside 1 the 2nd core silk and stranded around the 2nd core silk 6 the 2nd.

2. the main cord all-steel cord of rubber belt track according to claim 1 wherein, constitutes the diameter d k of core of described core strand and the relation that the diameter d s that constitutes the outer mantle fiber of described core strand satisfies 1.1 * ds 〉=dk 〉=ds.

3. the main cord all-steel cord of rubber belt track according to claim 1 and 2, wherein, the direction of lay that makes the direction of lay of the outer mantle fiber that constitutes described core strand and constitute the outer mantle fiber of described overcoat strand is mutual opposite direction.