JP2009287696A - Power transmitting belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmitting belt increased in the side pressure without hindering the reverse bending performance of the belt and having excellent transmission efficiency by evenly arranging core wires. <P>SOLUTION: This power transmitting belt 1 is structured of a belt body 2 which is formed of: a compressed rubber layer 4; an extension rubber layer 5; and an adhesive rubber layer 6 positioning between these rubber layers, and in which core wires 77 are embedded, and of a cover canvas 3 covering the periphery of the belt body 2. At least one ply of cord woven fabric 8 is arranged just under the adhesive rubber layer 6, and a direction of the cord 8 is arranged in the cross direction of the belt. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power transmission belt used in agricultural machinery and general industrial machinery. Specifically, in a wrapped V belt covered with a cover canvas, the lateral pressure is increased without impairing the reverse bending property of the belt, The present invention relates to a power transmission belt having a uniform arrangement and excellent transmission efficiency.

  Conventionally, a wrapped V belt in which the entire circumference of the belt is covered with a cover canvas has been used as a belt used in agricultural machinery and general industrial machinery.

  As the cover canvas covering the belt body, a woven fabric made of a material such as cotton, polyamide, or polyester is used. The cover canvas is used to increase the adhesive strength with the belt body and to protect the belt surface, after adhering treatment with resorcin-formalin-latex solution, and attaching rubber to the surface by soaking or spreading treatment. To do.

  In order to improve the lateral pressure resistance of the belt, a technique is disclosed in which short fibers are blended in the compressed rubber layer so as to be oriented in the belt width direction.

  However, when short fibers are blended in the compressed rubber layer, the lateral pressure resistance can be improved. However, in order to reduce the flexibility in the longitudinal direction of the belt, if it is wound around a small diameter pulley, the vibration width of the belt will be reduced. There is a problem that the side surface of the belt becomes faster and wears faster, and there is a problem that cracks are generated on the side of the compressed rubber layer of the belt when used in a layout in which reverse bending occurs. In order to suppress such a problem, the blend amount of the short fibers could not be increased too much.

  In order to solve the problem that the vibration of the compressed rubber layer containing such short fibers is increased and the problem that the crack is likely to occur due to bending, for example, Patent Document 1 and Patent Document 2 include A belt that reinforces in the belt width direction by embedding sudare has been introduced.

Japanese Utility Model Publication No. 62-104044 Japanese Utility Model Publication No. 62-190151

  As described in Patent Document 1 and Patent Document 2, by arranging the woven fabric in the belt, the lateral pressure resistance of the belt can be improved, and the belt can be made as in the case of blending short fibers. Since the flexibility is not greatly reduced, even when a pulley with a small diameter is used, the vibration of the belt does not increase, and the occurrence of cracks in the belt does not increase as when short fibers are blended.

  The belt disclosed in Patent Document 1 does not have an adhesive rubber layer disposed around the core (stretch body), and in one process, the core spun in a spiral shape is predetermined in the belt manufacturing process. There is a problem that it is not possible to hold in the position, the arrangement is disturbed and workability is deteriorated, and a problem occurs that peeling occurs due to insufficient adhesive force between the core wire and the compressed rubber layer. There is a possibility.

  Also, in Patent Document 2, unlike Patent Document 1, the core wire is surrounded by an adhesive rubber layer, and there is no problem that the layout of the core wire is disturbed in the manufacturing process of the belt. There is little problem that the adhesive strength between the layers is high and peeling occurs between the layers. However, the adhesive rubber layer has a lower hardness than other rubber layers, and when a high load is applied to the core wire, there is a problem that the core wire falls in the inner circumferential direction of the belt in the adhesive rubber layer. It was.

  Therefore, in the present invention, as described above, the arrangement of the core wires is disturbed in the belt manufacturing process, separation between layers occurs, or the core wires fall to the inner peripheral side in the belt when a high load is applied. The object is to provide a power transmission belt that prevents the phenomenon and has a long belt life and high transmission efficiency.

  In order to achieve the above object, according to claim 1 of the present invention, a compression rubber layer, an extension rubber layer, and an adhesive rubber layer positioned between these rubber layers are formed. In a power transmission belt comprising an embedded belt body and a cover canvas covering the belt body, at least one ply of a suede woven cloth is disposed immediately below the adhesive rubber layer, and the direction of the suda record is set in the belt. It is characterized by being arranged in the width direction.

  According to a second aspect of the present invention, there is provided the power transmission belt according to the first aspect in which no suda record is disposed on the adhesive rubber layer.

  According to a third aspect of the present invention, the power transmission belt according to any one of the first and second aspects is a belt used in a layout in which reverse bending occurs.

  As described in claim 1, the sudder is arranged immediately below the adhesive rubber layer in which the core wire is embedded. First, the lateral pressure resistance of the belt in the compressed rubber layer can be improved by arranging the sudder, and By arranging the core wire in the adhesive rubber layer, there is no disturbance of the core wire in the manufacturing process of the belt, and the problem of delamination of the belt at the core wire portion can be reduced, By disposing the taper directly under the adhesive rubber layer, it is possible to solve the problem of the core wire falling into the belt inner peripheral side when a high load is applied to the belt.

  According to the second aspect of the present invention, the fabric is not arranged on the adhesive rubber layer, and the flexibility is prevented from being lowered by arranging the fabric on the stretch rubber layer on the upper side of the adhesive rubber layer. is doing.

  According to the third aspect of the present invention, particularly when used in a pulley layout with reverse bending, the effect of not lowering the flexibility of the belt by not disposing the suede woven fabric on the adhesive rubber layer is remarkable.

  FIG. 1 is a cross-sectional perspective view of a power transmission belt which is a wrapped V-belt according to the present invention. A power transmission belt 1 is composed of a belt main body 2 and a cover canvas 3 covering the entire belt main body 2.

  The belt body 2 includes a compression rubber layer 4, an extension rubber layer 5, and an adhesive rubber layer 6, and the adhesive rubber layer 6 includes a low-stretch high-strength rope made of polyester, nylon, aramid fiber, or the like. The core wire 7 is embedded. From the compressed rubber layer 4 to the stretched rubber layer 5, the side surface of the belt has a V shape that fits into the V groove of the pulley.

  The rubber materials used for the compression rubber layer 4, the stretch rubber layer 5, and the adhesive rubber layer 6 constituting the belt body 2 include chloroprene rubber, nitrile rubber, ethylene propylene diene monomer, hydrogenated nitrile rubber, and chlorosulfonate. Examples of the rubber include polyethylene, alkylated chlorosulfonated polyethylene, and styrene butadiene rubber.

  In addition, ordinary compounding agents such as carbon black, zinc white, stearic acid, plasticizer, and anti-aging agent, and vulcanizing agents such as sulfur and organic oxides are mixed with the rubber as described above.

  Examples of the core wire 7 embedded in the adhesive rubber layer 6 include organic fibers and glass fibers such as polyester fiber, polyamide fiber, and aramid fiber. These core wires 7 are an isocyanate solution, an epoxy solution, and an RFL solution. And twisted cords treated with rubber compound adhesive. By arranging the adhesive rubber layer 6, the core wires 7 wound in a spiral shape in the belt manufacturing process can maintain a predetermined position so that the arrangement of the core wires 7 is not disturbed. When running, the problem that the rubber layer peels off from the position of the core 7 and the belt breaks down can be suppressed.

  As the cover canvas 3, a woven fabric made of single or plural kinds of fibers such as polyamide fibers such as 6 nylon and 66 nylon, polyester fibers, and aramid fibers can be used. Weaving can be used without being limited.

  Then, at least the surface of the cover canvas 3 that appears on the surface of the belt is subjected to an adhesion treatment 8 only with the RFL solution. Rubber may be attached to the surface of the cover canvas 3 on the belt body 2 side or on the surface that does not appear on the belt surface by an adhesive treatment with an RFL solution and then spreading. However, considering that the rubber is not exposed on the belt surface, it is preferable that the entire cover canvas 3 is only subjected to RFL treatment and no rubber is adhered.

  Further, the RFL liquid is used so that the rubber adhered to the surface of the cover canvas 3 that does not appear on the belt surface and the rubber constituting the belt main body 2 are not exposed to the surface through the opening of the cloth of the cover canvas 3. The solid content after treatment and drying is preferably 30 to 50% by mass. The solid content of the RFL liquid is composed of a solid content of resin and latex. This RFL solution is obtained by mixing an initial condensate of resorcin and formalin in latex, and the molar ratio of resorcin and formalin is 1: 1 to 1-3.

  Moreover, the mass% ratio of the initial condensate of resorcin and formalin and latex is 1: 1 to 10. The latex used here is a latex of styrene-butadiene-vinylpyridine terpolymer, hydrogenated nitrile rubber, chlorosulfonated polyethylene, epichlorohydrin, or the like.

  As a specific treatment method, the canvas is dipped in the RFL solution, dipped with a pair of rolls at a squeezing pressure of about 0.3 to 0.8 kgf / cm (gauge pressure), dried, and then similarly the RFL solution. When the amount of solid content of the RFL liquid adhering to the canvas after the treatment is less than 30% by mass, the bonded portion of the warp and weft of the canvas is easy to move and the opening is easily enlarged, and the rubber is passed through the opening. May be exposed. On the other hand, if it exceeds 50% by mass, the solid adhesion amount increases and the moldability of the cover canvas deteriorates, which is not preferable.

  In the present invention, a woven fabric fabric 8 that is a characteristic part of the present invention is embedded in the compressed rubber layer 4. The suede woven fabric 8 is woven by entwining small wefts so that the sud records that become large warps are aligned, and the suede records are arranged and embedded in the width direction of the belt. In order to improve the lateral pressure resistance, the number of the sudare woven fabric 8 is four in FIG. 1, but it is not particularly limited. One to a plurality of sudare woven fabrics 8 are compressed rubber layers. 4 is embedded.

  As the material of the suede woven fabric 8, materials made of materials such as polyamide fiber, polyester fiber, aramid fiber, and cotton can be used, and the adhesiveness between these materials and the rubber forming the compressed rubber layer 4 is bathed. Next, an adhesion process such as a process with an RFL solution or a process of soaking rubber is performed.

  Furthermore, in the present invention, the suede woven fabric 8 is disposed immediately below the adhesive rubber layer 6. By burying and arranging the core wire 7 in the adhesive rubber layer 6, it is possible to prevent the core wire 7 from being disturbed in the belt manufacturing process and to have problems such as delamination after running the belt because of its excellent adhesiveness. Although it can be prevented, the adhesive rubber layer 6 has a low hardness, and there has been a problem that the core wire falls in the belt when a large tension is applied to the belt. In the present invention, since the suede woven fabric 8 is disposed immediately below the adhesive rubber layer 6 in which the core wire 7 is embedded, the sagging woven fabric 8 can prevent the core wire 7 from falling in the belt.

  Further, in claim 2 of the present invention, the suede woven fabric 8 is disposed only in the compressed rubber layer 4 and is not disposed in the stretched rubber layer 5 positioned on the adhesive rubber layer 6. When using in a layout in which reverse bending occurs in which the pulley contacts from the back surface of the belt 1, a suede woven fabric is disposed in the stretch rubber layer 5 above the adhesive rubber layer 6 on the back surface side of the belt. If this is the case, the bending property of reverse bending deteriorates, leading to an early failure of the belt such as the occurrence of cracks. However, the problem can be solved by not disposing the suede woven fabric above the adhesive rubber layer 6.

  A belt having a structure as shown in FIG. 1 was prepared in which a suede woven fabric was buried immediately below the adhesive rubber layer. Further, as Comparative Example 1, a rubber composition containing a small amount of short aramid fibers in the compressed rubber layer was used, and a belt not mixed with a suede woven fabric was prepared. The same belt as Comparative Example 1 was produced. Table 1 shows the configuration of each belt.

  As shown in the figure, the driving pulley is 90 mmφ, the driven pulley is 160 mmφ, the tension pulley is 60 mmφ, the driving shaft is rotated at 3600 rpm, a load of 3.7 kW is applied to the driven shaft, and the tension pulley is 140 ° The belts of Examples and Comparative Examples 1 and 2 were run under the condition of being reversely bent at an angle of.

  As a result, the belt of Comparative Example 1 has a great wear on the side of the belt and has a life after running for 70 hours. The compressed rubber layer is reinforced by blending aramid short fibers. The sinking wear is also large, and it seems to have reached the end of its life early. In Comparative Example 2, a crack occurred on the bottom surface of the belt, and the service life was reached after 50 hours of running. This is presumably because the amount of the aramid short fibers added to the compressed rubber layer was too large, resulting in poor flexibility and early life.

  On the other hand, the belts of the examples showed excellent durability with no abnormality even after running up to 100 hours. From this, it has been found that in the power transmission belt of the present invention in which the woven fabric is disposed immediately below the adhesive rubber layer, a belt having a longer life than that obtained by blending short fibers in the compressed rubber layer can be obtained. .

  It can be used as a drive belt for agricultural machinery and industrial machinery.

It is a cross-sectional perspective view of a power transmission belt. It is a figure which shows the driving | running | working layout of a belt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt for power transmission 2 Belt body 3 Cover canvas 4 Compression rubber layer 5 Stretch rubber layer 6 Adhesive rubber layer 7 Core wire 8 Sudale woven fabric

Claims (3)

  A compression rubber layer, an extension rubber layer, and an adhesive rubber layer positioned between these rubber layers, and the adhesive rubber layer includes a belt main body in which a core wire is embedded, and a power consisting of a cover canvas covering the periphery of the belt main body. In the power transmission belt, at least one ply of a suede woven fabric is disposed immediately below the adhesive rubber layer, and the direction of the sudder record is disposed in the width direction of the belt.   The power transmission belt according to claim 1, wherein a suede woven fabric is not disposed on the adhesive rubber layer.   The power transmission belt according to claim 1, wherein the belt is used in a layout in which reverse bending occurs.

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