JP2017036829A - Wrapped v-belt and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deformation of an open hole or occurrence of a crack with the open hole as a starting point especially on a belt outer surface side and thus suppress the breakage of the belt, in a wrapped V-belt on which the open hole penetrating in a belt thickness direction is formed.SOLUTION: A wrapped V-belt 100 includes a belt body 10 whose cross section is formed into a V-shaped manner, and an outer covering cloth 50 covering the periphery of the V-shaped cross section of the belt body 10. The belt body 10 includes a compression layer 11 arranged on a belt inner surface side 100x, an expansion layer 12 arranged on a belt outer surface side 100y, and a core wire 13 buried between the compression layer 11 and the expansion layer 12. The expansion layer 12 includes an expansion rubber layer 12a composed of a rubber composition, and a reinforcement layer 12b including plural cloth layers 12bx with rubber mutually laminated in a belt thickness direction. The expansion rubber layer 12a and the reinforcement layer 12b are alternately laminated in the belt thickness direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wrapped V-belt in which a through-hole penetrating in the belt thickness direction is formed and a method for manufacturing the same.

  V-belts, V-ribbed belts, flat belts, and the like are known as friction transmission belts that transmit power using frictional forces. The V belt has a belt body in which a cross section perpendicular to the belt longitudinal direction is formed in a V shape. In the V belt, both side surfaces along the longitudinal direction of the belt serve as friction transmission surfaces for transmitting power using frictional force. The V-belt is composed of only a belt body, and a low-edge type (low-edge V-belt) in which the friction transmission surface is made of a rubber composition, and an outer covering that covers the periphery of the V-shaped cross section of the belt body in addition to the belt body. There is a wrapped type (wrapped V-belt) (see, for example, Patent Document 1) in which a friction transmission surface is formed of a jacket cloth. The low-edge V-belt and the wrapped V-belt are properly used depending on the application because of the difference in the properties of the friction transmission surface (friction coefficient between the rubber composition and the outer cloth).

JP 10-1332034 A

  Wrapped V-belts are widely used in general industrial machines (compressors, generators, pumps, etc.) and agricultural machines (mowers, etc.). In addition, when applying a wrapped V belt for driving grass collecting claws or the like in a grass collecting apparatus of a mower, after covering and vulcanizing the belt main body with a covering cloth, a through-hole penetrating in the belt thickness direction is formed, It is conceivable to drive the grass collecting claws by inserting the convex portions of the grass collecting nail fixtures into the through holes and running the belt. In this case, particularly on the belt outer surface side where the stretching operation is repeatedly performed due to the bending of the belt, the through hole is deformed and spreads due to the influence of the surrounding stretching, the load of the conveyed product, and the like, and the fixture may be rattled. Further, when stress is concentrated on the belt outer surface side as the belt is bent, a crack may be generated from the through hole on the belt outer surface side, and the belt may be broken.

  An object of the present invention is to suppress the deformation of a through-hole on the outer surface side of the belt and the generation of a crack starting from the through-hole in a wrapped V belt in which a through-hole penetrating in the belt thickness direction is formed. To provide a wrapped V-belt and a method for manufacturing the same, which can suppress breakage.

  According to a first aspect of the present invention, in a wrapped V-belt comprising: a belt main body having a V-shaped cross section perpendicular to the belt longitudinal direction; and an outer cover covering the periphery of the cross section of the belt main body. The belt main body is a compression layer disposed on the inner surface side of the belt, and includes a compression layer having a compression rubber layer composed of a rubber composition, and an extension layer disposed on the outer surface side of the belt, the rubber composition A reinforcing layer comprising a stretched rubber layer made of a material and a core wire embedded between the compressed layer and the stretched layer, wherein the stretched layer includes at least one fabric layer There is further provided a wrapped V-belt, wherein the stretched rubber layer and the reinforcing layer are laminated with each other in the belt thickness direction, and a through-hole penetrating in the belt thickness direction is formed.

  According to a second aspect of the present invention, a belt main body manufacturing step of manufacturing a belt main body in which a cross section perpendicular to the belt longitudinal direction is formed in a V shape, and after the belt main body manufacturing step, In the method for manufacturing a wrapped V-belt, comprising: a covering step of covering the periphery with a covering cloth; and a vulcanizing step of vulcanizing the belt body after the covering step, the belt body manufacturing step includes at least one After the reinforcing layer manufacturing step for preparing the reinforcing layer including the fabric of the layer and the reinforcing layer manufacturing step, the unvulcanized rubber composition sheet, the core wire, and the stretched rubber layer constituting the compressed rubber layer are formed on the molding drum. The unvulcanized rubber composition sheet to be formed, and the reinforcing layer are wound in order, and a compression layer having the compression rubber layer is disposed on the belt inner surface side, and the stretched rubber layer and the reinforcement layer are disposed on the belt outer surface side. Have A precursor of the belt body in which a layer is disposed, the stretch rubber layer and the reinforcing layer are laminated to each other in a belt thickness direction, and the core wire is buried between the compression layer and the stretch layer. A precursor preparation step to be prepared; and a cutting step of cutting the precursor after the precursor preparation step and forming the cross section into a V shape, and after the vulcanization step, a belt thickness direction There is provided a method for manufacturing a wrapped V-belt, further comprising a through-hole forming step for forming a through-hole penetrating through the belt.

  According to the first and second aspects of the present invention, the reinforcing layer including at least one layer of fabric is disposed between the belt outer surface side portion of the jacket fabric and the core wire. As a result, as will be described later in the embodiment, deformation of the through hole on the belt outer surface side and generation of a crack starting from the through hole can be suppressed, and consequently, breakage of the belt can be suppressed.

  The reinforcing layer may include a plurality of rubber-attached fabric layers composed of the fabric and a rubber composition attached to the fabric, and the plurality of rubber-attached fabric layers may be laminated to each other in the belt thickness direction. According to the said structure, compared with the case where a reinforcement layer contains only one layer of fabric, the generation | occurrence | production of the deformation | transformation of the through-hole in a belt outer surface side and the crack generation | occurrence | production from a through-hole is suppressed more reliably, and, thereby, the fracture | rupture of a belt Can be suppressed. In addition, by using a fabric layer with rubber composed of the fabric and the rubber composition attached to the fabric as the reinforcing layer, the fabric layer with rubber and its surroundings are accompanied by a vulcanization reaction of the rubber composition in the vulcanization step. Adhesion with (stretch rubber layer or jacket cloth) and adhesion between rubber-attached fabric layers can be performed easily and reliably.

  From the inner surface of the wrapped V-belt to the rubber-coated fabric layer located closest to the outer surface of the belt body with respect to the belt thickness direction among the plurality of rubber-coated fabric layers constituting the reinforcing layer. The first length, which is the length, is 80 to 98% of the thickness of the wrapped V-belt, and the belt thickness among the plurality of rubber-coated fabric layers constituting the reinforcing layer from the inner surface of the wrapped V-belt. The second length, which is the length in the belt thickness direction, from the outer surface of the belt main body to the rubber cloth layer in the direction of the direction is 76 to 96% of the thickness of the wrapped V-belt and the first It may be shorter than the length. The stress associated with the bending of the belt when the wrapped V-belt is traveling is concentrated in the belt thickness direction, particularly in a portion between the range defined by the first length and the range defined by the second length. Therefore, according to the above configuration, by arranging the reinforcing layer in the portion, it is possible to more reliably suppress the deformation of the through hole due to the stress concentration and the generation of the crack starting from the through hole, and thereby break the belt. Can be suppressed.

  The stretch layer may include the reinforcing layer disposed at a position closer to the outer surface than an intermediate position between the outer surface of the belt main body and the center of the core wire in the belt thickness direction. According to the said structure, the generation | occurrence | production of the deformation | transformation of the through-hole in a belt outer surface side and the crack starting from a through-hole can be suppressed more effectively, and a fracture | rupture of a belt can be further suppressed.

  The fabric may be a plain weave fabric arranged so that the center direction of the intersecting angle between the warp and the weft is parallel to the longitudinal direction of the belt. According to the said structure, the fall of the flexibility of a belt can be suppressed.

  The crossing angle may be 110 ° to 130 °. According to the said structure, a textile fabric becomes easy to expand-contract, and it can suppress more reliably the fall of the flexibility of a belt.

  A crack-resistant layer having crack resistance may be provided between the compressed layer and the jacket cloth on the belt inner surface side. According to this configuration, in the case where a fixture (a later-described stop plate 6 or the like) is disposed on the belt inner surface side in order to fix a member (such as a tine 5 described later) inserted into the through hole to the wrapped V-belt, The problem that the fixing tool penetrates the compression layer can be suppressed.

  A crack resistant layer having crack resistance may be provided on the surface of the outer surface of the belt opposite to the compressed layer on the inner surface side of the belt. According to this configuration, in the case where a fixture (a later-described stop plate 6 or the like) is disposed on the belt inner surface side in order to fix a member (such as a tine 5 described later) inserted into the through hole to the wrapped V-belt, The problem that the fixing tool penetrates the compression layer can be suppressed.

  The length of the crack resistant layer in the belt width direction may be 70 to 95% of the length of the wrapped V belt in the belt width direction on the belt inner surface side. According to the said structure, the said effect (effect which suppresses the problem that a fixing tool penetrates a compression layer) can be acquired, suppressing the material cost of a crack-resistant layer.

  The jacket may include an inner layer and an outer layer provided outside the inner layer, and at least the outer layer may be a crack resistant layer having crack resistance. According to this configuration, in the case where a fixture (a later-described stop plate 6 or the like) is disposed on the belt inner surface side in order to fix a member (such as a tine 5 described later) inserted into the through hole to the wrapped V-belt, The problem that the fixing tool penetrates the compression layer can be suppressed. Moreover, according to the said structure, simplification of a manufacturing process and cost reduction can be implement | achieved by using a jacket cloth as a crack-resistant layer instead of providing a crack-resistant layer separately.

  According to the present invention, the reinforcing layer including at least one fabric is disposed between the belt outer surface side portion of the jacket fabric and the core wire. As a result, as will be described later in the embodiment, deformation of the through hole on the belt outer surface side and generation of a crack starting from the through hole can be suppressed, and consequently, breakage of the belt can be suppressed.

It is sectional drawing orthogonal to the belt longitudinal direction which shows the wrapped V belt which concerns on 1st Embodiment of this invention. It is a schematic block diagram which shows a layout when the wrapped V belt which concerns on 1st Embodiment of this invention is wound around two pulleys, and is made to drive | work. It is a top view which shows the textile fabric of the plain weave used as a fabric. It is a top view which shows the part in which the through-hole was formed in the wrapped V belt which concerns on 1st Embodiment of this invention. It is a flowchart which shows the manufacturing method of the wrapped V belt which concerns on 1st Embodiment of this invention. It is sectional drawing orthogonal to the belt longitudinal direction which shows the wrapped V belt which concerns on 2nd Embodiment of this invention. It is sectional drawing orthogonal to the belt longitudinal direction which shows the wrapped V belt which concerns on 3rd Embodiment of this invention. It is a disassembled perspective view which shows the state in which a tine is attached to the wrapped V belt which concerns on 4th Embodiment of this invention. It is the side view seen from the belt longitudinal direction which shows the state where the tine was attached to the wrapped V belt concerning a 4th embodiment of the present invention. It is the side view seen from the belt longitudinal direction which shows the state where the tine was attached to the wrapped V belt concerning a 5th embodiment of the present invention.

  First, a wrapped V-belt (hereinafter simply referred to as “belt”) 100 according to a first embodiment of the present invention and a method for manufacturing the same will be described with reference to FIGS.

  As shown in FIG. 1, the belt 100 includes a belt main body 10 having a V-shaped cross section perpendicular to the belt longitudinal direction (the longitudinal direction of the belt 100), and a periphery of the V-shaped cross section of the belt main body 10. Covering jacket 50 to be coated. For example, the belt 100 has a thickness H of 8.0 to 26.0 mm and a length of 20 to 400 inches (508 to 10,200 mm).

  For example, as shown in FIG. 2, the belt 100 is wound around pulleys 1 and 2 and travels as the pulley 1 is driven. At this time, in the belt 100, both side surfaces (left and right side surfaces of the V-shaped cross section shown in FIG. 1) along the belt longitudinal direction serve as friction transmission surfaces, and inner wall surfaces that form V grooves in the pulleys 1 and 2 The power is transmitted using frictional force. Hereinafter, the inner peripheral side of the belt 100 wound around the pulleys 1 and 2 is referred to as a belt inner surface side 100x, and the outer peripheral side of the belt 100 wound around the pulleys 1 and 2 is referred to as a belt outer surface side 100y.

  As shown in FIG. 1, the belt main body 10 is embedded between the compression layer 11 disposed on the belt inner surface side 100 x, the stretch layer 12 disposed on the belt outer surface side 100 y, and the compression layer 11 and the stretch layer 12. A core wire 13.

  The compression layer 11 has the compression rubber layer 11a comprised with a rubber composition.

  The stretch layer 12 includes a stretch rubber layer 12a made of a rubber composition and a reinforcing layer 12b including a plurality of layers (for example, 2 to 50 layers, in this embodiment, 6 layers) rubber-coated fabric layers 12bx. The fabric layer 12bx with rubber is composed of a fabric 12bx1 (see FIG. 3) and a rubber composition attached to the fabric 12bx1. In the present embodiment, a plurality of rubber-coated fabric layers 12bx are laminated together in the belt thickness direction (the belt 100 thickness direction). The stretch rubber layer 12a and the reinforcing layer 12b are laminated to each other in the belt thickness direction.

  The rubber composition of the compressed rubber layer 11a, the rubber composition of the stretched rubber layer 12a, and the rubber composition of the fabric layer with rubber 12bx may be the same or different. The rubber component constituting the rubber composition is a rubber that can be vulcanized or cross-linked. For example, natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, hydrogenated nitrile rubber and the like Rubber, ethylene-α-olefin elastomer, chlorosulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, epichlorohydrin rubber, acrylic rubber, silicone rubber, urethane rubber, fluorinated rubber, etc., one or two of these It may be a combination of more than one species. The rubber composition of the compressed rubber layer 11a, the rubber composition of the stretched rubber layer 12a, and the rubber composition of the fabric layer with rubber 12bx may include a vulcanizing agent or a crosslinking agent, a co-crosslinking agent, if necessary. Vulcanization aid, vulcanization accelerator, vulcanization retarder, metal oxide (such as zinc oxide, magnesium oxide, calcium oxide, barium oxide, iron oxide, copper oxide, titanium oxide, aluminum oxide), enhancer (carbon black) , Silicon oxides such as hydrous silica), short fibers, fillers (clay, calcium carbonate, talc, mica, etc.), softeners (oils such as paraffin oil and naphthenic oil), processing agents or processing aids ( Stearic acid, metal stearate, wax, paraffin, etc.), anti-aging agent (antioxidant, thermal anti-aging agent, anti-bending agent, anti-ozone degradation agent, etc.), colorant, tackifier, plasticizer Coupling agent (silane coupling agent, etc.), stabilizers (UV absorbers, heat stabilizers, etc.), may be blended a flame retardant, antistatic agent or the like. In addition, you may mix | blend a metal oxide as a crosslinking agent.

  The reinforcing layer 12b is disposed at a position closer to the outer surface 10y of the belt body 10 than an intermediate position between the outer surface 10y of the belt body 10 and the center 13x of the core wire 13 in the belt thickness direction. Specifically, the first length h1 (from the inner surface of the belt 100, with the rubber closest to the outer surface 10y of the belt body 10 in the belt thickness direction among the plurality of rubber-coated fabric layers 12bx constituting the reinforcing layer 12b) The length in the belt thickness direction up to the fabric layer 12bx is 51 to 99% (preferably 80 to 98%) of the thickness of the belt 100 (the length in the belt thickness direction from the inner surface to the outer surface of the belt 100) H. Further, the second length h2 (the rubber farthest from the outer surface 10y of the belt main body 10 in the belt thickness direction among the plurality of rubber-coated fabric layers 12bx constituting the reinforcing layer 12b from the inner surface of the belt 100) The length in the belt thickness direction up to the attached fabric layer 12bx) is 50 to 98% (preferably 76 to 96%) of the thickness H of the belt 100, and from the first length h1. Short.

  The fabric 12bx1 is made of, for example, synthetic fibers such as polyester, polyamide, aramid, and vinylon, natural fibers such as cotton, or blended fibers of these, and in terms of cost, versatility, and strength, a blend of cotton and polyester. It is preferably made of yarn fibers.

  As shown in FIG. 3, the fabric 12bx1 is a plain weave arranged so that the center direction of the intersecting angle θ of the warp and the weft (θ = 110 ° to 130 ° in this embodiment) is parallel to the longitudinal direction of the belt. It is a woven fabric. The density of the fabric 12bx1 is, for example, 70 to 95 warps / 5 cm and 70 to 95 wefts / 5 cm weft. The thickness of the fabric 12bx1 is, for example, 0.2 to 2.0 mm.

  The core wires 13 extend in the belt longitudinal direction and are arranged in the belt width direction (with a constant interval in the width direction of the belt 100. One core wire 13 extends along the belt longitudinal direction. It may be arranged in a spiral shape, or a plurality of core wires 13 may be arranged so as to extend in the belt longitudinal direction and be separated from each other in the belt width direction.

  The core wire 13 is, for example, a polyester fiber (polyalkylene arylate fiber, polyethylene terephthalate fiber, ethylene naphthalate fiber, or the like having C2-4 alkylene arylate as a main constituent unit such as ethylene terephthalate and ethylene-2,6-naphthalate). ), A twisted cord made of a synthetic fiber such as an aramid fiber, an inorganic fiber such as a carbon fiber, and using a multifilament yarn (various twists, single twists, rank twists, etc.). The fineness of the multifilament yarn is, for example, 2000 to 10000 denier (preferably 4000 to 8000 denier). The average wire diameter (fiber diameter of the twisted cord) of the core wire 13 is, for example, 0.5 to 3 mm (preferably 0.6 to 2 mm, more preferably 0.7 to 1.5 mm).

  As with the fabric 12bx1, the jacket fabric 50 is made of, for example, synthetic fibers such as polyester, polyamide, aramid, and vinylon, natural fibers such as cotton, or fibers of these mixed yarns, in terms of cost, versatility, and strength. It is preferably made of a blended fiber of cotton and polyester.

  As shown in FIG. 4, the belt 100 is formed with a plurality of through holes 80 penetrating in the belt thickness direction. The through holes 80 are respectively formed in the center in the belt width direction and are spaced apart from each other in the belt longitudinal direction at a predetermined pitch. In addition, in the part in which the through-hole 80 was formed, the jacket cloth 50, the compression layer 11, and the stretch layer 12 are removed, and the core wire 13 is cut | disconnected.

  Next, a method for manufacturing the belt 100 will be described with reference to FIG.

  First, the belt main body 10 is manufactured (S1: belt main body manufacturing process). The belt body production step S1 includes a reinforcing layer production step S1a, a precursor production step S1b, and a cutting step S1c.

  In the reinforcing layer production step S1a, one fabric 12bx1 is subjected to any one of the following processes (1) to (4) to thereby form one rubber-coated fabric layer (rubber-added fabric layer 12bx before vulcanization). Make it. Alternatively, after the plurality of fabrics 12bx1 are individually treated in any one of the following (1) to (4), a plurality of layers of fabric with rubber (fabric layer with rubber 12bx before vulcanization) are produced. The multilayer fabric layers with rubber are laminated to each other and pressure-bonded with a roll or the like to produce a laminate.

(1) Rubber sheet adhesion treatment (treatment of laminating a sheet-like unvulcanized rubber composition on fabric 12bx1 and adhering them through rolls rotating at the same surface speed)
(2) Rubber film forming treatment (unvulcanized rubber composition is dissolved in a solvent to form a rubber paste, the rubber paste is applied to the surface of the fabric 12bx1, and then the solvent is evaporated, whereby the surface of the fabric 12bx1 To form a film of unvulcanized rubber composition)
(3) Friction treatment (by using a calender roll, the unvulcanized rubber composition and the fabric 12bx1 are simultaneously passed between rolls rotating at different surface speeds, so that the unvulcanized material is passed between the fibers of the fabric 12bx1. (Rubbing rubber composition)
(4) Soaking treatment (by passing the fabric 12bx1 through a dipping bath containing a dilute rubber paste, and then removing the excess rubber paste adhering to the fabric 12bx1 through the fabric 12bx1 between the two rolls, the fabric 12bx1 Treatment to infiltrate the rubber paste inside the fiber)

  Before the treatments (1) to (4) are performed, the fabric 12bx1 is added to the RFL (resorcin-formalin-latex) solution in order to improve the adhesion between the fibers of the fabric 12bx1 and the unvulcanized rubber composition. You may perform the process which immerses.

  After the reinforcing layer manufacturing step S1a, a precursor manufacturing step S1b is performed. In the precursor production step S1b, an unvulcanized rubber composition sheet constituting the compression rubber layer 11a, the core wire 13, and an unvulcanized rubber composition sheet constituting the stretched rubber layer 12a are formed on the molding drum. The reinforcing layer 12b (one fabric layer with rubber or the above laminate) produced in S1a is wound in order. At this time, one layer of the rubber-added fabric layer or laminate is wound around the molding drum a predetermined number of times to form a plurality of layers of the rubber-added fabric layer 12bx. Thereby, the compression layer 11 having the compression rubber layer 11a is disposed on the belt inner surface side 100x, and the stretching layer having the stretching rubber layer 12a and the reinforcing layer 12b including the plurality of rubber-equipped fabric layers 12bx on the belt outer surface side 100y. 12 is a belt body 10 precursor in which a stretch rubber layer 12a and a reinforcing layer 12b are laminated in the belt thickness direction, and a core wire 13 is buried between the compression layer 11 and the stretch layer 12. Make it.

  After the precursor preparation step S1b, a cutting step S1c is performed. In the cutting step S1c, the precursor formed in the precursor preparation step S1b is cut to have a predetermined width, and a cross section perpendicular to the belt longitudinal direction is formed in a V shape.

  After the belt main body manufacturing step S1, the periphery of the V-shaped cross section of the belt main body 10 is covered with the jacket cloth 50 (S2: covering step).

  After the covering step S2, the belt body 10 is vulcanized (S3: vulcanizing step).

  After the vulcanization step S3, the through hole 80 is formed (S4: through hole forming step). In the through-hole forming step S4, the through-hole 80 is formed by machining (cutting, punching, etc.) from the belt outer surface side 100y.

  As described above, according to the present embodiment, the reinforcing layer 12b including at least one layer of the fabric 12bx1 is disposed between the belt outer surface side 100y portion of the jacket fabric 50 and the core wire 13. As a result, as will be shown later in the embodiment, deformation of the through-hole 80 on the belt outer surface side 100y and generation of cracks starting from the through-hole 80 can be suppressed, and consequently breakage of the belt 100 can be suppressed.

  The reinforcing layer 12b includes a plurality of rubber-coated fabric layers 12bx composed of the fabric 12bx1 and a rubber composition attached to the fabric 12bx1, and the plurality of rubber-coated fabric layers 12bx are laminated to each other in the belt thickness direction. According to the said structure, compared with the case where the reinforcement layer 12b contains only 1 layer of cloth 12bx1, generation | occurrence | production of the crack from the deformation | transformation of the through-hole 80 in the belt outer surface side 100y and the through-hole 80 is suppressed more reliably. As a result, breakage of the belt 100 can be suppressed. Further, by using the fabric layer 12bx with rubber composed of the fabric 12bx1 and the rubber composition attached to the fabric 12bx1 as the reinforcing layer 12b, in the vulcanization step S3, with the vulcanization reaction of the rubber composition, with the rubber Adhesion between the fabric layer 12bx and its surroundings (the stretched rubber layer 12a and the covering fabric 50) and adhesion between the rubber-equipped fabric layers 12bx can be easily and reliably performed.

  First length h1 (from the inner surface of the belt 100 to the rubber-coated fabric layer 12bx located closest to the outer surface 10y of the belt body 10 in the belt thickness direction among the plurality of rubber-coated fabric layers 12bx constituting the reinforcing layer 12b. Of the belt thickness direction) is 80 to 98% of the belt thickness H, and the second length h2 (from the inner surface of the belt 100, the plurality of rubber-coated fabric layers 12bx constituting the reinforcing layer 12b). Of these, the length in the belt thickness direction) from the outer surface 10y of the belt main body 10 to the fabric layer 12bx with the rubber farthest in the belt thickness direction is 76 to 96% of the thickness H of the belt 100 and the first length. shorter than h1. The stress associated with the bending of the belt during travel of the belt 100 is concentrated in a portion between the range defined by the first length h1 and the range defined by the second length h2 in the belt thickness direction. Therefore, according to the above configuration, by arranging the reinforcing layer 12b in the portion, the deformation of the through hole 80 due to the stress concentration and the generation of cracks starting from the through hole 80 are more reliably suppressed, and consequently the belt. 100 breaks can be suppressed.

  The stretch layer 12 includes a reinforcing layer 12b disposed at a position closer to the outer surface 10y of the belt body 10 than an intermediate position between the outer surface 10y of the belt body 10 and the center 13x of the core wire 13 in the belt thickness direction. According to the said structure, generation | occurrence | production of the crack of the deformation | transformation of the through-hole 80 in the belt outer surface side 100y and the through-hole 80 starting from the through-hole 80 can be suppressed, and the breakage of the belt 100 can be further suppressed.

  The fabric 12bx1 is a plain weave fabric arranged so that the center direction of the intersection angle θ between the warp and the weft is parallel to the belt longitudinal direction (see FIG. 3). According to the said structure, the fall of the flexibility of the belt 100 can be suppressed.

  The crossing angle θ is 110 ° to 130 °. According to the said structure, a textile fabric becomes easy to expand-contract, and the fall of the flexibility of the belt 100 can be suppressed more reliably.

  Next, a wrapped V-belt (hereinafter simply referred to as “belt”) 200 according to a second embodiment of the present invention will be described with reference to FIG.

  The belt 200 according to the present embodiment has substantially the same configuration as the belt 100 of the first embodiment except for the configuration of the stretch layer 12.

  In the present embodiment, the stretch layer 12 includes three stretch rubber layers 12a1, 12a2, and 12a3, and two reinforcing layers 12b1 and 12b2. Regarding the belt thickness direction, the stretched rubber layer 12a1 is closest to the belt outer surface side 200y, the stretched rubber layer 12a3 is closest to the belt inner surface side 200x, and the stretched rubber layer 12a2 is between the stretched rubber layer 12a1 and the stretched rubber layer 12a3. . The reinforcing layer 12b1 is between the stretched rubber layers 12a1 and 12a2, and the reinforcing layer 12b2 is between the stretched rubber layers 12a2 and 12a3. Each of the reinforcing layers 12b1 and 12b2 includes five layers of fabric layers 12bx with rubber.

  Next, a wrapped V-belt (hereinafter simply referred to as “belt”) 300 according to a third embodiment of the present invention will be described with reference to FIG.

  The belt 300 according to the present embodiment has substantially the same configuration as the belt 100 of the first embodiment, except that the outer surface of the belt is arched and the outer cover cloth 50 is provided with two layers.

  In the belt 300 according to the present embodiment, the surface on the belt inner surface side 300x is flat, but the surface on the belt outer surface side 300y is not flat but is arched. In this case, H, h1, and h2 are defined at the center in the belt width direction.

  As described above, according to the second and third embodiments, the same effect based on the same configuration as that of the first embodiment can be obtained.

  Subsequently, a wrapped V-belt (hereinafter simply referred to as “belt”) 400 according to a fourth embodiment of the present invention will be described with reference to FIGS. 8 and 9.

  The belt 400 according to the present embodiment is the belt 100 according to the first embodiment, except that a crack resistant layer 60 having crack resistance is provided between the compression layer 11 and the jacket cloth 50 on the belt inner surface side 400x. The configuration is substantially the same.

  The crack resistant layer 60 is made of, for example, an aramid sheet (one-way sheet or two-way sheet), an aramid mesh, an aramid band, an aramid / nylon composite sheet, or a carbon sheet (one-way sheet or two-way sheet). As the aramid sheet (unidirectional sheet) and the carbon sheet (unidirectional sheet), for example, the materials shown in Table 1 below may be adopted.

  A tine (collecting claw fixture) 5 is inserted into each through hole 80 of the belt 400. A metal stop plate 6 is disposed on the belt inner surface side 400x. Each tine 5 passes through the belt 400 from the belt outer surface side 400 y to the belt inner surface side 400 x, passes through each through hole 6 a formed in the stop plate 6, and is fixed to the belt 400 by the nut 7. .

  The length c in the belt width direction of the crack-resistant layer 60 is 70 to 95% of the length C in the belt width direction of the belt 400 on the belt inner surface side 400x, and the length d in the belt width direction of the stopper plate 6. 120 to 160% (see FIG. 9).

  As described above, according to the present embodiment, the same effect based on the same configuration as that of the first embodiment can be obtained, and the stop plate 6 is provided with the compression layer by providing the crack resistant layer 60. 11 can be suppressed. Further, the length c in the belt width direction of the crack resistant layer 60 is set to 70 to 95% of the length C in the belt width direction of the belt 400 on the belt inner surface side 400x, thereby suppressing the material cost of the crack resistant layer 60. However, the above effect (an effect of suppressing the problem that the stopper plate 6 penetrates the compression layer 11) can be obtained.

  Subsequently, a wrapped V-belt (hereinafter simply referred to as “belt”) 500 according to a fifth embodiment of the present invention will be described with reference to FIG.

  The belt 500 according to the present embodiment has substantially the same configuration as the belt 400 of the fourth embodiment except for the arrangement of the crack resistant layer 60.

  In the present embodiment, the crack resistant layer 60 is provided not on the belt inner surface side 500x but on the surface (outer surface) opposite to the compressed layer 11 of the outer cover cloth 50, not between the compressive layer 11 and the outer cover cloth 50. Yes.

  Also in the present embodiment, as in the fourth embodiment, the tine 5 is inserted into each through hole 80 of the belt 500, and each tine 5 penetrates the belt 500 from the belt outer surface side 500y to the belt inner surface side 500x, Each through hole formed in the stop plate 6 is inserted and fixed to the belt 500 by the nut 7. The length c in the belt width direction of the crack-resistant layer 60 is 70 to 95% of the length C in the belt width direction of the belt 500 on the belt inner surface side 500x, and the length d in the belt width direction of the stopper plate 6. 120 to 160% (see FIG. 9).

  As described above, according to the present embodiment, similar to the fourth embodiment, the same effect based on the same configuration as that of the first embodiment can be obtained, and the crack resistant layer 60 is provided. The problem that the stop plate 6 penetrates the compression layer 11 can be suppressed. Further, the length c in the belt width direction of the crack resistant layer 60 is set to 70 to 95% of the length C in the belt width direction of the belt 500 on the belt inner surface side 500x, thereby suppressing the material cost of the crack resistant layer 60. However, the above effect (an effect of suppressing the problem that the stopper plate 6 penetrates the compression layer 11) can be obtained.

  Subsequently, a wrapped V-belt (hereinafter simply referred to as “belt”) according to a sixth embodiment of the present invention will be described.

  The belt according to the present embodiment has substantially the same configuration as the belt 400 of the fourth embodiment except that the crack resistant layer 60 is not separately provided but the outer cloth 50 is used as the crack resistant layer.

  In the present embodiment, the outer cover cloth 50 has a two-layer structure (see FIG. 7) including an inner layer and an outer layer provided outside the inner layer, as in the third embodiment, and both the inner layer and the outer layer are crack-resistant layers. It has become.

  Also in the present embodiment, as in the fourth embodiment, the tines 5 are inserted into the respective through holes 80 of the belt, and the respective tines 5 penetrate the belt from the belt outer surface side to the belt inner surface side, The formed through holes are inserted and fixed to the belt by nuts 7.

  As described above, according to the present embodiment, as in the fourth embodiment, the same effect based on the same configuration as in the first embodiment can be obtained, and a crack resistant layer is provided. The problem of the stop plate 6 penetrating the compression layer 11 can be suppressed. Further, according to the present embodiment, the manufacturing process can be simplified and the cost can be reduced by using the outer cover cloth 50 as the crack resistant layer, instead of providing the crack resistant layer 60 separately.

<Configuration of Belts According to Examples and Comparative Examples>
As an example, the inventor of the present application manufactured the same belt as the belt 100 according to the first embodiment before forming the through hole by using the following material by the manufacturing method according to the first embodiment. Further, as a comparative example, a belt similar to the example was manufactured by a known manufacturing method except that the reinforcing layer 12b was not provided.

  As the compressed rubber layer 11a and the stretched rubber layer 12a, the rubber compositions shown in Table 2 were used.

  As the fabric 12bx1, the warp and weft are mixed yarns of cotton spun yarn having a thickness of 20 and three twists and polyester yarn having a thickness of 20 and three twists, and the density of the warps and wefts is 75/5 cm A plain weave woven fabric having a warp and weft crossing angle θ of approximately 120 degrees and a thickness of 0.4 mm was used. And in the reinforcement layer preparation process S1a, after performing the process which immerses one fabric 12bx1 in RFL (resorcin-formalin-latex) liquid, the rubber composition of the said Table 3 is used for the said one fabric 12bx1. The friction treatment of (3) above was carried out to produce a single layer of fabric layer with rubber (pre-vulcanized fabric layer with rubber 12bx). Thereafter, in the precursor production step S1b, one layer of the fabric layer 12bx with rubber was wound around the molding drum six times to form the six layers of fabric layer 12bx with rubber. Here, the arrangement of the reinforcing layer 12b is set to h1 / H = 97% and h2 / H = 84%.

  As the core wire 13, a cord made of polyethylene terephthalate fiber and having an average wire diameter (fiber diameter of twisted cord) of 2.28 mm was used.

  As the covering cloth 50, the same cloth as the cloth 12bx1 was used. Moreover, also about the jacket cloth 50, after performing the process which immerses the jacket cloth 50 in RFL (resorcinol-formalin-latex) liquid, the friction treatment was performed to the jacket cloth 50 using the rubber composition of the said Table 3. .

  The belt thickness H = 20.0 mm, the belt length = 183 inches (4,648 mm), and the width of the belt outer surface side 100y = 31.5 mm.

<Belt tension test before and after through-hole formation>
Two belts according to the example and the comparative example were prepared and cut so as to be approximately 600 mm in length. Then, in each of the belts according to the example and the comparative example, a “no through hole” test piece and a “with through hole” test piece were prepared. The test piece “without a through-hole” was cut so as to have a length of about 600 mm as described above, and no through-hole was formed. After the test piece “with through-hole” was cut to have a length of about 600 mm as described above, two through-holes 80 (each having a diameter of 8 mm and a belt length of 29 mm across the center in the belt longitudinal direction) Two through-holes 80) are formed that are spaced apart from each other in the direction. Each test piece was pulled using a tensile tester (Amsler tester) at a tensile speed of 50 mm / min until the test piece broke, and the elongation at 7.8 kN, the elongation at break, and the strength at break were measured (the following) (See Table 4).

  From Table 4, it can be seen that in the “no through-hole” test piece, the example has a smaller elongation and a higher strength at break than the comparative example (that is, the belt has higher rigidity and strength). This is because the rigidity of the belt outer surface side 100y is improved by providing the reinforcing layer 12b including at least one layer of the fabric 12bx1, and the deformation of the through holes 80 on the belt outer surface side 100y and the cracks starting from the through holes 80 are improved. It is inferred that the occurrence was suppressed.

  In the test piece “with through-hole”, both the example and the comparative example were broken due to deformation of the through-hole or a crack originating from the through-hole, but from Table 4, the example was broken more than the comparative example. It can be seen that the elongation at break and the strength at break are large. This is because the belt outer surface side 100y is reinforced by providing the reinforcing layer 12b including at least one layer of the fabric 12bx1, and even if the deformation of the through hole or the generation of the crack starting from the through hole 80 occurs, the belt immediately. Is presumed to not break.

<Strength test around the through hole>
The belts according to the examples and comparative examples were cut so that the length excluding the grip allowance was 150 mm, and one through hole having a diameter of 10 mm was formed at one end of the belt in the longitudinal direction as a test piece. For each test piece, a fixing tool having a fixing pin is arranged at the top of the tensile tester (autograph), the fixing pin is inserted into the through hole, and the other end in the belt longitudinal direction of the test piece is gripped by the chuck, and the test is performed The piece was fixed. Then, the fixture was pulled upward at a tensile speed of 50 mm / min, and the strength when the test piece broke was measured (see Table 5 below).

  From Table 5, it can be seen that the example has higher strength around the through hole than the comparative example. This is because the rigidity of the belt outer surface side 100y is improved by providing the reinforcing layer 12b including at least one layer of the fabric 12bx1, and the deformation of the through holes 80 on the belt outer surface side 100y and the cracks starting from the through holes 80 are improved. It is inferred that the occurrence was suppressed.

<Real machine durability test>
In the belts according to the example and the comparative example, two through holes 80 (two through holes 80 each having a diameter of 8 mm and spaced apart from each other in the belt longitudinal direction at a pitch of 29 mm across the center in the belt longitudinal direction) Then, the tines 5 were inserted into the respective through holes 80 as in the fourth to sixth embodiments, and an actual machine durability test was performed in the field. As for the actual machine, the model is Hee Maker (gatherer), the tine is 18 in 2 rows, the work width is 160 cm, the work speed is 5 to 8 km / hour, and the adaptive tractor is 9.5 to 22 kW (13 to 30 PS). In the actual machine durability test, the lifetime was measured and the damage status at the end of the lifetime was confirmed (see Table 6 below).

  From Table 6, it can be seen that the example has a longer lifetime than the comparative example.

  In addition, the consideration result is as follows about the damage condition of the belt which concerns on an Example. First, when the belt is bent in the pulley, the stop plate 6 (see FIGS. 8 to 10) that cannot respond to the bending sequentially repeats close contact with the outer cover cloth 50 and separation from the outer cover cloth 50. By this operation, a crack occurs in a portion of the outer cover cloth 50 where the edge of the stopper plate 6 abuts, and when the crack progresses, the stopper plate 6 breaks through the outer cover cloth 50. Further, the stop plate 6 cracks the compression layer 11, and the crack progresses, and the stop plate 6 penetrates the compression layer 11 and the stretch layer 12. As a result, the portion of the belt where the stop plate 6 is disposed penetrates in the thickness direction and falls off together with the tine.

  The inventor of the present application devised a configuration in which a crack-resistant layer is provided as in the fourth to sixth embodiments in order to avoid the above-described damage situation.

<Bending fatigue test>
The belts according to Examples 1 to 8 and the comparative example are wound around two pulleys each having an outer diameter of 315 mm, and an axial load of 500 kg is applied to the driven pulley, while the ambient temperature is 23 ° C., the load is 30 ps, and the rotational speed is 1800 rpm. It was rotated and the lifetime was measured (see Table 7 below). In this test, the life was judged when the length of the crack starting from the through hole 80 was 5 mm or more.

  As shown in Table 7, Examples 1-8 differ in the values of h1 / H and h2 / H. Example 1 has the same configuration as the above example, and Examples 2 to 8 are obtained by changing the arrangement of the reinforcing layer 12b from Example 1 and changing the values of h1 / H and h2 / H.

  From Table 7, it can be seen that Examples 1 to 8 have a longer lifetime than the comparative example. From the results of Examples 1 to 8, it can be seen that the smaller the values of h1 / H and h2 / H (the longer the reinforcing layer 12b is from the belt outer surface side 100y), the shorter the life.

  The preferred embodiments and examples of the present invention have been described above. However, the present invention is not limited to the above-described embodiments and examples, and various design changes are possible as long as they are described in the claims. Is something.

The reinforcing layer may include only one layer of fabric.
The position of the reinforcing layer is not particularly limited as long as the reinforcing layer is disposed between the belt outer surface side portion of the jacket and the core wire.For example, with respect to the belt thickness direction, the outer surface of the belt body and the center of the core wire The intermediate position may be disposed at a position farther from the outer surface of the belt body than the intermediate position.
The stretch layer may include a plurality of reinforcing layers arranged at the various positions.
The fabric is not limited to a plain weave fabric, and may be a fabric such as a twill weave or satin weave, a knitted fabric such as warp knitting or weft knitting, or a non-woven fabric.
-An adhesive rubber layer may be provided between the stretch layer and the compression layer.
The compression layer may include elements other than the compression rubber layer.
-The number of through-holes may be one or more, and is not specifically limited.
-A through-hole may be formed in the arbitrary positions in a belt. For example, the center of the through hole is not limited to being disposed at the center in the belt width direction, and the center may be disposed at a position deviating from the center in the belt width direction. In this case, when the center of the through hole is arranged within 30% of the belt width on both sides from the center in the belt width direction, a belt or other convex portion is inserted into the through hole and the belt is run The problem that the belt tilts can be suppressed.
-The shape of a through-hole is not limited to a circle, For example, an ellipse and a rectangle may be sufficient.
A crack resistant layer may be provided on both the inner surface side of the belt between the compression layer and the outer cover cloth and on the inner surface side of the belt on the opposite side of the outer cover cloth from the compression layer.
-One of the inner layer and the outer layer of the outer cover cloth may be a crack resistant layer.

5 Tine 6 Stopping plate 7 Nut 10 Belt body 10y Outer surface 11 Compression layer 11a Compression rubber layer 12 Extension layer 12a Extension rubber layer 12b Reinforcement layer 12bx Fabric layer with rubber 12bx1 Fabric 13 Core wire 13x Center position of core wire 50 Outer cloth 60 Resistance Crack layer 80 Through hole 100; 200; 300; 400; 500 Wrapped V-belt 100x; 200x; 300x; 400x; 500x Belt inner surface side 100y; 200y; 300y; 400y; 500y Belt outer surface side θ Crossing angle h1 First length h2 2nd length H Belt thickness

Claims (11)

A belt body having a V-shaped cross section perpendicular to the belt longitudinal direction;
In a wrapped V-belt comprising an outer cover covering the periphery of the cross section of the belt body,
The belt body is
A compression layer disposed on the inner surface of the belt, the compression layer having a compression rubber layer composed of a rubber composition;
An extension layer disposed on the belt outer surface side, the extension layer having an extension rubber layer composed of a rubber composition;
A cord embedded between the compression layer and the stretch layer,
The stretch layer further includes a reinforcement layer including at least one fabric, and the stretch rubber layer and the reinforcement layer are laminated to each other in the belt thickness direction,
A wrapped V-belt, wherein a through-hole penetrating in the belt thickness direction is formed.   The reinforcing layer includes a plurality of rubber-coated fabric layers composed of the fabric and a rubber composition attached to the fabric, and the plurality of rubber-coated fabric layers are laminated to each other in the belt thickness direction. The wrapped V-belt according to claim 1. From the inner surface of the wrapped V-belt to the rubber-coated fabric layer located closest to the outer surface of the belt body with respect to the belt thickness direction among the plurality of rubber-coated fabric layers constituting the reinforcing layer. The first length, which is the length, is 80 to 98% of the thickness of the wrapped V-belt,
In the belt thickness direction from the inner surface of the wrapped V-belt to the rubber-coated fabric layer farthest from the outer surface of the belt body with respect to the belt thickness direction of the plurality of rubber-coated fabric layers constituting the reinforcing layer. The wrapped V-belt according to claim 2, wherein the second length, which is a length, is 76 to 96% of the thickness of the wrapped V-belt and shorter than the first length.   The stretch layer includes the reinforcing layer disposed at a position closer to the outer surface than an intermediate position between an outer surface of the belt main body and a center of the core wire in a belt thickness direction. 4. The wrapped V belt according to any one of 3 above.   The said fabric is a plain-woven fabric arrange | positioned so that the center direction of the crossing angle of a warp and a weft may become parallel to a belt longitudinal direction, The any one of Claims 1-4 characterized by the above-mentioned. Wrapped V belt.   The wrapped V-belt according to claim 5, wherein the crossing angle is 110 ° to 130 °.   The wrapped V according to any one of claims 1 to 6, wherein a crack-resistant layer having crack resistance is provided between the compression layer and the jacket cloth on the belt inner surface side. belt.   The crack-resistant layer which has crack resistance was provided in the surface on the opposite side to the said compression layer of the said jacket cloth in the said belt inner surface side, The any one of Claims 1-7 characterized by the above-mentioned. Wrapped V belt.   The length in the belt width direction of the crack-resistant layer is 70 to 95% of the length in the belt width direction of the wrapped V-belt on the belt inner surface side. Wrapped V belt. The outer covering includes an inner layer and an outer layer provided outside the inner layer,
The wrapped V-belt according to any one of claims 1 to 9, wherein at least the outer layer is a crack-resistant layer having crack resistance. A belt body production step of producing a belt body in which a cross section perpendicular to the belt longitudinal direction is formed in a V shape;
After the belt main body manufacturing step, a covering step of covering the periphery of the cross section of the belt main body with a covering cloth;
In the method for manufacturing a wrapped V-belt, comprising a vulcanization step of vulcanizing the belt body after the covering step,
The belt body manufacturing process includes:
A reinforcing layer production step of producing a reinforcing layer comprising at least one fabric layer;
After the reinforcing layer preparation step, an unvulcanized rubber composition sheet constituting the compressed rubber layer, a core wire, an unvulcanized rubber composition sheet constituting the stretched rubber layer, and the reinforcing layer after the reinforcing layer manufacturing step In order, a compression layer having the compression rubber layer is disposed on the inner surface side of the belt, an extension layer having the extension rubber layer and the reinforcing layer is disposed on the outer surface side of the belt, and the stretch rubber layer and the A precursor production step of producing a precursor of the belt body, in which reinforcing layers are laminated to each other in a belt thickness direction, and the core wire is buried between the compression layer and the stretch layer;
Cutting the precursor after the precursor preparation step, and forming the cross section into a V shape,
A method for manufacturing a wrapped V-belt, further comprising a through-hole forming step of forming a through-hole penetrating in the belt thickness direction after the vulcanization step.

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