JP3079705U - Wrapped V belt - Google Patents

Abstract

(57) [Problem] To provide a belt that does not generate rubber powder even when friction occurs with a pulley, and that can reduce the generation of noise. SOLUTION: In a wrapped V-belt 1 comprising a belt main body 2 and a cover canvas 3 covering the periphery of the belt main body, at least a portion of the cover canvas 3 which appears on the belt surface is bonded only with a resorcinol-formalin-latex liquid. did.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a wrapped V-belt used for agricultural machines, sewing machines, and the like, and more particularly to a wrapped V-belt in which scattering of rubber powder and the like from the belt surface is reduced.

[0002]

[Prior art]

 Conventionally, wrapped V-belts have been used for agricultural machines, sewing machines and other industrial machines. The wrapped V-belt is a belt in which the entire belt body made of rubber is covered with a cover canvas.

[0003] As a cover canvas for covering the belt body, a woven fabric made of a material such as cotton, nylon, or polyester is used. The cover canvas is bonded with a resorcinol-formalin-latex solution (RFL solution) to increase the adhesive strength to the belt body and to protect the belt surface, and then the surface is covered with rubber by soaking or spreading. Was generally used.

[0004]

[Problems to be solved by the invention]

 However, when a cover canvas to which rubber is adhered after the bonding treatment with the RFL liquid as described above is used, the coefficient of friction between the pulley and the pulley increases, and the friction between the belt and the pulley causes the rubber on the cover canvas surface to become rubbery. However, there is a problem that the powder is scattered as powder and noise is generated.

[0005] Therefore, there have been cases where application to a place where the scattering of rubber powder is disliked or a place where noise is desired to be reduced is avoided.

[0006] Furthermore, scattering of the rubber adhered to the surface can be prevented by using only the adhesive treatment with the RFL solution for the cover canvas, but the cover canvas is worn out due to long-term use of the belt and the like. The opening forming the belt body is enlarged, and the rubber forming the belt body is exposed to the surface through the opening of the cover canvas, which may become rubber powder.

In applications where the clutch is repeatedly turned on and off, such as in agricultural machines, there is also a problem that the impact torque at the time of the intermittent connection is large and a heavy load is imposed on the driving device and the mechanism itself. Therefore, an object of the present invention is to provide a wrapped V-belt that can reduce the impact torque by sliding the belt without scattering the rubber powder from the surface of the cover canvas.

[0008]

[Means for solving the problem]

 In order to achieve the above object, according to claim 1 of the present invention, a belt body having a compression rubber layer, an extension rubber layer, and an adhesive rubber layer between both rubber layers and having a core wire embedded in the adhesive rubber layer is provided. In a wrapped V-belt made of a cover canvas covering the periphery of the belt body, at least a portion of the cover canvas which appears on the belt surface is treated with only a resorcin-formalin-latex solution.

In the wrapped V-belt using such a cover canvas, no rubber is present on the belt surface, so that even if friction occurs between the pulley and the pulley, no rubber powder is generated, and the ON-state of the clutch is reduced. The impact torque at the time of OFF and the like can be reduced, and the generation of noise can be reduced.

In the second aspect, the solid content of the resorcinol-formalin-latex liquid on the cover canvas is adjusted to 30 to 50% by weight so that the rubber constituting the belt body is not exposed from the cloth of the cover canvas. Wrapped V-belt.

By adjusting the amount of solids adhered to the cover canvas by the RFL treatment within a predetermined range, it is possible to prevent the opening of the cover canvas from being enlarged, and the belt body of the cover canvas can be prevented from expanding. The rubber attached to the side surface and the rubber forming the belt body can be prevented from being exposed to the belt surface through the opening.

[0012]

[Embodiment of the invention]

 FIG. 1 is a sectional perspective view of a wrapped V-belt according to the present invention. A wrapped V-belt 1 includes a belt body 2 and a cover canvas 3 covering the entire belt body 2.

The belt body 2 includes a compression rubber layer 4, an extension rubber layer 5, and an adhesive rubber layer 6. The adhesive rubber layer 6 has low elongation and high strength made of polyester, nylon, aramid fiber, or the like. A cord 7 consisting of a cord is embedded. Then, from the compression rubber layer 4 to the extension rubber layer 5, the side surface of the belt has a V shape that fits into the V groove of the pulley.

The rubber material used for the compression rubber layer 4, the extension rubber layer 5, and the adhesive rubber layer 6 constituting the belt body 2 includes chloroprene rubber, nitrile rubber, ethylene propylene diene monomer, and hydrogenated nitrile rubber. And chlorosulfonated polyethylene, alkylated chlorosulfonated polyethylene, natural rubber, and styrene butadiene rubber.

[0015] Further, ordinary compounding agents such as carbon black, zinc white, stearic acid, a plasticizer, an antioxidant, and vulcanizing agents such as sulfur and organic peroxide are compounded with the above rubber.

Examples of the core wire 7 embedded in the adhesive rubber layer 6 include organic fibers such as polyester fiber, polyamide fiber, and aramid fiber and glass fiber, and the core wire 7 is an isocyanate solution, An epoxy solution, a twisted cord treated with an RFL solution and a rubber compound adhesive, or the like is used.

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, and aramid fibers can be used. Any of a twill fabric and a satin fabric may be used.

Then, at least the surface of the cover canvas 3 which appears on the surface of the belt is subjected to an adhesive treatment 8 using only the RFL solution. Rubber may be adhered to the surface of the cover canvas 3 that is on the side of the belt body 2 or that does not appear on the belt surface by a method such as spreading after bonding with an RFL solution. However, from the viewpoint that the rubber is not exposed on the belt surface, it is preferable that only the RFL treatment is performed on the entire cover canvas 3 so that no rubber is attached.

Further, the rubber attached to the surface of the cover canvas 3 that does not appear on the belt surface and the rubber constituting the belt body 2 are prevented from being exposed to the surface through the opening of the cloth of the cover canvas 3. Preferably, the solid content after the treatment with the RFL solution and drying is 30 to 50% by weight. The solid content of the RFL solution is composed of the solid content of the resin and the latex. This RFL solution is a latex mixture of an initial condensate of resorcinol and formalin, and the molar ratio of resorcinol to formalin is 1 to 1 to 3.

The weight percentage of the initial condensate of resorcinol and formalin to latex is 1: 1 to 10. The latex used here is a latex such as styrene-butadiene-vinylpyridine terpolymer, hydrogenated nitrile rubber, chlorosulfonated polyethylene, epichlorohydrin and the like.

As a specific treatment method, the canvas is immersed in an RFL solution, dipped by a pair of rolls at a squeezing pressure of about 0.3 to 0.8 kgf / cm (gauge pressure), and dried. Further, the same treatment with the RFL solution is performed to adjust the solid content of the RFL solution attached to the canvas to 30 to 50% by weight. If the solid content of the RFL liquid is less than 30% by weight, the bonding portion between the warp and the weft of the canvas is easy to move, the opening is easily enlarged, and the rubber may be exposed through the opening. is there. On the other hand, if it exceeds 50% by weight, the solid content is increased and the moldability of the cover canvas is deteriorated, which is not preferable.

[0022]

【Example】

 As an example, a belt having the surface of the cover canvas of the present invention bonded only with a resorcinol-formalin-latex solution was used. Using a conventional belt with a covered canvas, the sound pressure level generated when the clutch was inserted and the impact torque when and after the clutch were inserted were measured.

The test conditions were such that the drive pulley was 92.5 mmφ, the driven pulley was 171.5 mmφ, and the tension pulley was running at 1800 rpm in a layout of 85 mmφ. Table 1 shows the sound pressure test results, and Table 2 shows the impact torque test results.

[0024]

[Table 1]

[0025]

[Table 2]

As described above, in the belt of the present invention, the impact torque at the time of inserting the clutch can be significantly reduced, and the load on the driving device and the mechanism can be reduced by the slip of the belt. Understand.

[0027]

[Effect of the invention]

 As described above, according to the first aspect of the present invention, the belt body including the compression rubber layer, the extension rubber layer, and the adhesive rubber layer between the two rubber layers, and the core body is buried in the adhesive rubber layer, and the periphery of the belt body is covered. In a wrapped V-belt made of a cover canvas, at least a portion of the cover canvas that appears on the belt surface is treated only with a resorcinol-formalin-latex solution.

The wrapped V-belt using such a cover canvas has no rubber on the belt surface, so that no rubber powder is generated even if friction occurs between the pulley and the pulley, and the ON-state of the clutch is reduced. The impact torque at the time of OFF and the like can be reduced, and the generation of noise can be reduced.

In the second aspect, the solid content of the resorcin-formalin-latex liquid on the cover canvas is adjusted to 30 to 50% by weight so that the rubber constituting the belt body is not exposed from the cloth of the cover canvas. Wrapped V-belt.

By adjusting the amount of solids adhering to the cover canvas by the RFL treatment within a predetermined range, it is possible to prevent the opening of the cover canvas from being enlarged and to increase the size of the cover canvas. The rubber attached to the side surface and the rubber forming the belt body can be prevented from being exposed to the belt surface through the opening.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a wrapped V-belt according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wrapped V-belt 2 belt body 3 cover canvas 4 compression rubber layer 5 extension rubber layer 6 adhesive rubber layer 6 V-shaped groove part 7 core wire 8 bonding treatment

Claims (2)

[Utility model registration claims] 1. A wrapped V comprising a belt body having a compression rubber layer, an extension rubber layer, and an adhesive rubber layer between both rubber layers, a core body embedded in the adhesive rubber layer, and a cover canvas covering the periphery of the belt body. A wrapped V-belt, wherein at least a portion of the cover canvas that appears on the belt surface is treated with only a resorcin-formalin-latex solution. 2. The method according to claim 1, wherein the solid content of the resorcinol-formalin-latex liquid on the cover canvas is adjusted to 30 to 50% by weight so that the rubber constituting the belt body is not exposed from the cloth of the cover canvas. Wrapped V described in 1
belt.