JPH09126279A - Tension member for belt and belt using the tension member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve resisting properties of a tension member for a glass fiber belt by bringing a plural of glass fibers into lines, dipping them into an adhesion processing fluid, whose principal component is a mixture of an initial condensation product of a resorcinol formalin and a latex, pulling them up and giving a heat treatment. SOLUTION: A toothed belt (transmission belt) 1 is provided with a tension member 2 provided in the circumferential direction of the belt, a back rubber 3 provided on one side (back side) of the tension member 2, and a toothed rubber 4 provided on the opposite side of the back rubber 3 in the circumferential direction of the belt at intervals with a specific pitch, and the toothed rubber 4 side is covered with a toothed cloth 5. A fiber bundle made by focusing a plural number of non-alkali glass fibers are brought into lines and dipped into a VP-SBR system RFL (an adhesive of a principal component of a mixture of an initial condensation product of a resorcinol formalin and a latex). After pulling them up and giving a heat treatment, it is formed by a twisted glass cord.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt tension member used for various belts such as a toothed belt, a V-belt, a flat belt, and a speed belt, and the toothed belt using the belt tensioned member. Etc. regarding the belt.

[0002]

2. Description of the Related Art Transmission belts such as toothed belts are widely reinforced by using glass cords as tensile members in order to improve toughness or dimensional stability. For example, in the case of a transmission belt used for driving an OHC (overhead cam) of an automobile, it is usually ECG150-3.
/ 13 (Glass fiber bundles with a fiber diameter of 9 μm and 200 fibers are collected and twisted under to form a child lasso.
A cord obtained by gathering three strands and twisting them is adopted as a tensile member, and therefore, it has a twist and a twist.

As such glass cords, those treated with resorcin / formalin / rubber latex (hereinafter abbreviated as RFL) in order to improve the adhesion to the rubber of the belt body are generally used (for example, Japanese Patent Publication No. 3-422
90, JP-A-4-59640, and JP-A-4-59640.
50144). The RFL process is performed on the glass fiber bundle. That is, the glass fiber bundle is dipped in the RFL solution, pulled up, heated and dried, and then the above-mentioned twisting and twisting are performed.

[0004] Recently, as the temperature around the engine of an automobile rises, hydrogenated nitrile rubber, which is more excellent in heat resistance than conventional chloroprene rubber, has been used as a rubber for automobile belts. The hydrogenated nitrile rubber has a lower adhesion to the tensile body than other rubbers. Therefore, there is also a proposal of further applying rubber glue to the above-mentioned twisted yarn (see JP-A-2-4715 and JP-A-3-170534).

[0005]

However, the belt using the above-mentioned glass cord as a tensile body can obtain expected effects due to the toughness and dimensional stability of the tensile body in normal use, When used in hot and humid conditions,
There is a problem that the tensile body is deteriorated at an early stage, the strength of the belt is remarkably lowered, the bending fatigue resistance of the belt is lowered, and the belt is apt to be cut. That is, an object of the present invention is to improve the water resistance of the tensile member for a belt made of glass fiber, and thus the water resistance of the belt.

[0006]

The inventor of the present invention began to investigate the cause of the above-mentioned problems from an early stage, and this caused a decrease in the adhesion between the ply-twisted yarns (3/0 fiber bundles) due to the entry of water into the tensile body. It was clarified that it was the cause.

That is, the glass fibers of the glass fiber bundle are adhered to each other by the above-mentioned RFL, and the glass fiber bundles forming the undertwist are also closely adhered to each other via the RFL on the surface of each other. However, if several lower twisted yarns are lined up and twisted, the lower twisted yarns do not completely adhere to each other because the surface of each lower twisted yarn has minute unevenness, and Is RFL
Since they are only bonded by adhesion of, the bonding force is weak. Therefore, if water enters the tension body,
This water content reduces the adhesion between the ply-twisted yarns, and the ply-twisted yarns having a large degree of freedom are displaced to cause damage to each other. Hereinafter, means for solving the above problems will be specifically described.

That is, the invention according to claim 1 is a belt tension member comprising a plurality of glass fibers, wherein the plurality of glass fibers are aligned and pre-condensed with resorcin-formalin and a latex. By being immersed in an adhesive treatment liquid containing the mixture as a main component and being pulled up and heat-treated, in a state where they are adhered to each other by an adhesive containing the mixture as a main component impregnated between the glass fibers,
It is characterized by being twisted in one direction.

Further, the invention according to claim 2 is a belt tension member comprising a plurality of glass fibers, wherein a plurality of pretwisted glass fiber bundles are aligned and aligned in the initial stage of resorcinol-formalin. By being immersed in an adhesion treatment liquid containing a mixture of a condensate and a latex as a main component, pulled up and heat-treated, they were adhered to each other by an adhesive containing the mixture as a main component impregnated between the glass fiber bundles. In this state, the upper twist is made in the opposite direction to the lower twist.

According to a third aspect of the present invention, in the tensile member for a belt according to the first or second aspect, rubber glue containing a rubber component and a resin component is used in place of the adhesive. It is characterized by being.

The invention according to claim 4 is characterized in that the surface of the tensile member for a belt according to any one of claims 1 to 3 is covered with a rubber glue layer. Is a tensile body.

A fifth aspect of the present invention is a belt comprising the belt tension member according to any one of the first to fourth aspects.

The glass fiber used in each of the above inventions is not particularly limited, and a generally called non-alkali glass fiber can be used, and the diameter of the cord can be reduced while maintaining the cord (tensile body) strength. It is desirable to use high-strengthened glass fibers having a fiber diameter of 8 μm or less in the sense that they have an advantageous effect on fatigue resistance.

Further, assuming an OHC drive belt of an automobile, considering the balance between the cord strength and the cord diameter,
The number of fibers is preferably 4000 or more and 6600 or less. If it is less than 4000, the required strength cannot be obtained, and if it is more than 6600, the cord diameter becomes large, which is disadvantageous to the bending fatigue resistance.

Further, the invention relates to RFLs (adhesives containing a mixture of resorcin / formalin initial condensation product and latex) as a main component, and the latex thereof is not particularly limited. Is a styrene-butadiene-vinylpyridine terpolymer, chlorosulfonated polyethylene, nitrile rubber, hydrogenated nitrile rubber, epichlorohydrin, SBR, chloroprene rubber,
Examples thereof include chlorinated butadiene, olefin-vinyl ester copolymer, latex such as natural rubber, and mixtures thereof.

In the invention according to claim 3, the rubber glue is
A diene rubber compound such as hydrogenated nitrile rubber or chlorosulfonated polyethylene rubber, or a highly saturated hydrogenated nitrile rubber compound is dissolved in an organic solvent. In addition,
The hydrogenated nitrile rubber may contain an organic peroxide.

In the invention according to claim 4, the rubber material constituting the rubber glue layer on the surface of the belt tensile member is not particularly limited, but in consideration of adhesiveness with the belt main body rubber, chloride Halogen-containing substances such as rubber, polyvinyl chloride, chloroprene rubber, and chlorosulfonated polyethylene are preferable.

In each of the third and fourth aspects of the invention, the solvent for the rubber paste is not particularly limited, but is usually an aromatic hydrocarbon such as benzene, toluene, xylene, ethers, trichloroethylene or the like. Halogenated aliphatic hydrocarbons are preferably used.

(Operation) In the invention according to claim 1,
Since the belt tensile member is made by aligning a plurality of glass fibers, subjecting them to RFL treatment, and then twisting them in one direction, the problem of peeling between the undertwisted yarns does not exist. When used as a tension member for a power transmission belt,
The water bending fatigue resistance, which has hitherto been considered to be a weak point of the glass cord, is improved.

According to the second aspect of the invention, a plurality of ply-twisted yarns, each ply-twisted, are aligned and subjected to RFL treatment, and then ply-twisted in the opposite direction to the ply-twisted yarn is added. The ply-twisted yarns are tightly adhered to each other via RFL, water is prevented from entering between the ply-twisted yarns, and the water resistance is increased. Moreover, the tensile member has low rigidity, and when it is used as a tensile member for a transmission belt, bending fatigue resistance is high.

In the invention according to claim 3, since rubber glue is used instead of RFL, the tensile strength of the belt is further advantageous in water resistance, and the water resistance of the belt is improved.

In the invention according to claim 4, since the rubber glue layer is provided on the surface of the belt tension member, the adhesion between the tension member and the belt main body rubber is enhanced, and the belt running stability is improved. However, the water bending fatigue resistance is dramatically improved.

Since the invention according to claim 5 is a belt using the tensile member for a belt according to any one of claims 1 to 4, the action of the invention according to each of the above claims The effect can be obtained.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

Example 1 A belt 1 is shown in FIG. The belt 1 is a toothed belt (transmission belt), and includes a tensile body 2 provided in the circumferential direction of the belt, a back rubber 3 provided on one side (rear side) of the tensile body 2, and a back rubber 3. A tooth rubber 4 is provided on the side opposite to the rubber 3 at a predetermined pitch in the circumferential direction of the belt, and the tooth rubber 4 side is covered with a tooth cloth 5.

FIG. 2 shows the tensile body 2. This tensile member 2 was prepared by aligning 33 fiber bundles each consisting of 200 alkali-free glass fibers 6 (E glass having a diameter of 9 μm) 6 and Vp-SBR system R having a concentration of 20% by weight.
The glass cord is formed by immersing it in the FL liquid, pulling it up, heat-treating it at 240 ° C. for 1 minute, and then twisting it at a twisting frequency of 2.0 times / inch. Above Vp-
SBR RFL is Vp-SBR as latex.
(Vinylpyridine-styrene-butadiene terpolymer).

The back rubber 3 and the tooth rubber 4 are formed of a rubber composition containing hydrogenated nitrile rubber as a main raw material. In addition, the above-mentioned tooth cloth 5 is made of yarn 6 extending in the belt width direction,
A 6-nylon thread is used, and an industrial 6,6-nylon woolly processed thread is used as the thread extending in the belt longitudinal direction.

The toothed belt 1 is formed by a usual press-fitting method using each of the above materials, and the tooth pitch is 8 mm.
It is a TS tooth type having 113 teeth and a belt width of 19 mm.

<Embodiment 2> As shown in FIG. 3, the tensile member 7 of the present embodiment is the reverse of the undertwist by aligning 11 lassos (undertwisted yarns) 8 each subjected to RFL treatment. It is twisted in the direction.

That is, the above-mentioned strands 8 are prepared by aligning three fiber bundles each of which is formed by bundling 200 alkali-free glass fibers 6 (similar to those in Example 1) and twisting 2.0 times.
It is made by twisting at a twist of 1 inch. At the time of the upper twist, 11 strands 8 of this strand were aligned and immersed in the same RFL solution as in Example 1, pulled up and heat-treated at 240 ° C. for 1 minute, and then twisted in the opposite direction to the lower twist. A glass cord was obtained by performing twisting at 2.0 times / inch. Then, the toothed belt 1 similar to that in Example 1 was prepared by using the glass cord as the tensile body 7.

Example 3 The twisted glass cord of Example 1 was dipped in a 20% by weight solution of a rubber paste containing chlorosulfonated polyethylene as a main component and pulled up to 150
By drying for 1 minute in an atmosphere of ° C, a rubber glue layer 9 was formed on the surface of the glass cord as shown in Fig. 4. Then, this was used as a belt tension member 10 to prepare a toothed belt 1 similar to that in Example 1.

<Example 4> The glass cord after the overtwisted yarn of Example 2 was subjected to the same rubber gluing treatment as in Example 3 to form a rubber gluing layer on the surface thereof, which was used as a belt tension member. A toothed belt similar to that in Example 1 was prepared.

<Embodiment 5> The same conditions and conditions as in Embodiment 4 except that the glass fiber is replaced by non-alkali glass fiber (E glass having a diameter of 9 μm) instead of glass fiber and high strength glass having a fiber diameter of 7 μm is used. A glass cord was prepared by the method, and this was used as a belt tension member to prepare a toothed belt similar to that of Example 1.

Example 6 The number of glass fibers in Example 5 is 200 × 3 × 11 = 6600, but the glass cord is produced under the same conditions and method as in Example 5, except that the number of glass fibers is 7000. Was prepared, and this was used as a belt tension member, and a toothed belt similar to that of Example 1 was prepared.

<Example 7> A glass cord was prepared under the same conditions and method as in Example 5 except that the number of glass fibers was 5,200. The glass cord was used as a belt tensile member, and the same toothing as in Example 1 was applied. I made a belt.

<Example 8> A glass cord was prepared under the same conditions and method as in Example 5 except that the number of glass fibers was set to 4000, and the glass cord was used as a belt tensile member, and the same toothing as in Example 1 was applied. I made a belt.

<Example 9> A glass cord was prepared under the same conditions and method as in Example 5 except that the number of glass fibers was set to 3600, and this was used as a belt tension member, and the same toothing as in Example 1 was applied. I made a belt.

<Example 10> In Example 1, the RFL
Adopt rubber glue treatment instead of treatment, and heat treatment 150
A glass cord was prepared under the same conditions and methods as in Example 1 except that the temperature was set to 1 minute, and a toothed belt similar to that in Example 1 was prepared by using the glass cord as a belt tension member. This rubber paste is composed of hydrogenated nitrile rubber as a main component and has a solid content of 15%.
MEK (methyl ethyl ketone) solution. That is, the composition of the rubber paste is as shown below.

(Rubber paste blend) H-NBR (Zetpo12020: manufactured by Zeon Corporation) 100 parts by weight carbon black 50 parts by weight Anti-aging agent 2.5 parts by weight Processing aid 3.0 parts by weight ZnO 5.0 parts by weight Stearin Acid 0.5 parts by weight DCP (dicumyl peroxide) 4.0 parts by weight Co-crosslinking agent 3.0 parts by weight The above formulation was diluted to 15% with methyl ethyl ketone.

<Embodiment 11> In the second embodiment, the RFL
Adopt rubber glue treatment instead of treatment, and heat treatment 150
A glass cord was prepared under the same conditions and methods as in Example 2 except that the temperature was set to 1 minute, and a toothed belt similar to that in Example 1 was prepared using this as a belt tension member. The same rubber glue as in Example 10 was used.

Example 12 A glass cord having a rubber glue layer on its surface was prepared by using the same rubber glue as in Example 3 on the belt tension member of Example 10, and used as a belt tension member. A toothed belt similar to that in Example 1 was prepared.

Example 13 A glass cord having a rubber glue layer on its surface was prepared by using the same rubber glue as that used in Example 3 on the belt tension member of Example 11, and used as a belt tension member. A toothed belt similar to that in Example 1 was prepared.

<Comparative Example 1> Three fiber bundles each containing 200 non-alkali glass fibers (E glass) having a diameter of 9 μm were aligned and dipped in the same RFL solution as in Example 1,
Number of twists 2.0 after heat treatment at 240 ° C for 1 minute
Twisted / inch and twisted into a lasso. This child rope 1
Collect one strand and twist it in the opposite direction to the above-mentioned twist, 2.0 times / in
A glass cord was created by twisting it on the ch. Then, using this as a belt tension member, a toothed belt similar to that of Example 1 was prepared.

Comparative Example 2 A rubber glue layer was formed on the surface of the glass cord after twisting on the surface of Comparative Example 1 in the same manner as in Example 3, and this was used as a tensile member for a belt. A toothed belt 1 was created.

<Comparative Example 3> In Comparative Example 1, a rubber paste treatment is adopted instead of the RFL treatment, and the heat treatment is performed at 150 ° C.
A glass cord was prepared under the same conditions and method as in Comparative Example 1 except that the time was set to x 1 minute, and the same toothed belt as in Example 1 was prepared using this as a belt tension member. The same rubber glue as in Example 10 was used.

Comparative Example 4 A rubber glue layer was formed on the surface of the glass cord of Comparative Example 3 in the same manner as in Example 3, and the toothed belt 1 similar to that in Example 1 was used as a belt tensile member. Created.

(Water Injection Bending Fatigue Test) A bending fatigue test was performed on each of the belts of the above Examples and Comparative Examples. That is, the toothed belt A is wound around four large pulleys 31 constituting the belt bending tester shown in FIG. 5 and four small pulleys 32 (diameter 30 mm) arranged between the adjacent large pulleys 31, 40 kg on the toothed belt A with weight 33
With the tension of f applied, water 34 is dripped at the tooth bottom of the toothed belt A at a rate of 1 liter per hour.
The belt was run at 500 rpm until cutting, and the number of times the belt was bent before cutting was examined. The test results are shown in Table 1.

[0047]

[Table 1]

According to the same table, the toothed belts of Examples 1 to 13 had a significantly greater number of bendings until cutting than Comparative Examples 1 to 4. From this, it is understood that the present invention is effective in dramatically improving the water resistance of the belt.

Example 1 and Example 2 are different only in the presence or absence of undertwisting, and the relationship between Example 3 and Example 4, the relationship between Example 10 and Example 11, and the example 12 are different from each other. The relationship with the thirteenth embodiment is similar. Comparing each of these, the one twisted with the lower twist has a larger number of bending times before cutting, and the belt strength is also greater. From this, it is understood that the flex resistance of the belt is further improved by subjecting the glass fiber before the RFL treatment or the rubber paste treatment to the pre-twisting and then performing the treatment.

Further, Example 1 and Example 10 are different only in that the treatment liquid is RFL or rubber paste, and the relationship between Example 2 and Example 11 and the relationship between Example 3 and Example 12 are different. The same applies to the relationship between the fourth embodiment and the thirteenth embodiment. Comparing each of these, the number of times of bending until cutting is greater in the case where the rubber paste treatment is performed. This is because the rubber glue has a lower water absorption of the tensile body than the RFL.

Further, Example 1 and Example 3 are different only in the presence or absence of the surface rubber glue layer, and the relationship between Example 2 and Example 4, the relationship between Example 10 and Example 12, and the example 11 are shown. And the relationship between Example 13 and Example 13 are the same. Comparing each of these, the one having the rubber glue layer has a larger number of flexing times before cutting. It is considered that this is because the adhesive force between the tensile body and the belt main body rubber (back rubber and tooth rubber) is stabilized by the rubber glue layer, and the water resistance of the belt is improved.

Next, comparing Example 4 and Example 5,
The latter is different from the former only in that a high-strength glass having a fiber diameter of 7 μm is used as a glass type, but the latter has a larger number of bendings before cutting. It is considered that this is because the rigidity of Example 5 is lower. Each of Examples 5 to 9 also uses high-strength glass, but the number of fibers is different. Comparing these, the smaller the number of fibers, the greater the number of bendings until cutting. It is considered that the smaller the number of fibers is, the lower the rigidity is, which is advantageous for improving the flexibility.

[0053]

According to the invention of claim 1, since a plurality of glass fibers are aligned and subjected to RFL treatment to be twisted in one direction, the fibers are present even in the presence of water. The water resistance of the belt is dramatically improved as compared with the conventional one without impairing the adhesion between the belts.

According to the second aspect of the present invention, a plurality of glass fiber bundles are collected and twisted, and the required number of the glass fiber bundles are aligned and subjected to RFL treatment. Therefore, it is possible to reduce the rigidity of the tensile body, which is advantageous in improving bending fatigue resistance.

According to the invention of claim 3, in the tensile body according to claim 1 or 2, since the rubber paste treatment is performed instead of the RFL treatment, water absorption of the tensile body is further suppressed. This is advantageous for improving the water resistance of the belt.

According to the invention of claim 4, since the rubber glue layer is provided on the surface of the tensile body, the adhesiveness between the tensile body and the rubber of the belt main body is improved, and the running stability of the belt is enhanced.

According to the invention of claim 5, a belt that exhibits the effects of the inventions of claims 1 to 4 can be obtained.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a toothed belt.

FIG. 2 is a partial cross-sectional perspective view showing the belt tension member of the first embodiment.

FIG. 3 is a partially sectional perspective view showing a belt tension member of Example 2.

FIG. 4 is a partial cross-sectional perspective view showing a belt tension member of Example 3.

FIG. 5 is a schematic configuration diagram of a belt bending fatigue testing machine.

[Explanation of symbols]

 1 Toothed belt 2, 7 Tensile body 3 Back rubber 4 Tooth rubber 5 Tooth cloth 6 Glass fiber 8 Wool (bottom twisted yarn) 9 Rubber glue layer 31 Large pulley 32 Small pulley 33 Weight 34 Water A Test belt

Claims (5)

[Claims] 1. A tensile member for a belt, which comprises a plurality of glass fibers, wherein the plurality of glass fibers are aligned and adhered to each other and a mixture of a precondensate of resorcin / formalin and a latex is a main component. By being immersed in a treatment liquid, pulled up, and heat-treated, they are twisted in one direction while being bonded to each other by an adhesive containing the mixture as a main component impregnated between the glass fibers. A belt tensioner. 2. A belt tension member comprising a plurality of glass fibers, wherein a plurality of pretwisted glass fiber bundles are aligned to form a mixture of a resorcin-formalin initial condensation product and a latex. In the state of being adhered to each other by the adhesive containing the above mixture impregnated between the glass fiber bundles by being immersed in the bonding treatment liquid containing the main component, being pulled up and subjected to heat treatment, the reverse twisting direction A tensile member for a belt, which is characterized by being twisted on the top. 3. The tension member for a belt according to claim 1 or 2, wherein rubber glue containing a rubber component and a resin component is used in place of the adhesive. A belt tensioner. 4. A belt tensile member, wherein the surface of the belt tensile member according to claim 1 is covered with a rubber glue layer. 5. A belt comprising the belt tension member according to any one of claims 1 to 4.