JP6867261B2 - Hexagon belt and manufacturing method of hexagon belt - Google Patents

Description

The present invention relates to a hexagonal belt and a method for manufacturing the hexagonal belt.

Friction transmission belts such as V-belts, V-ribbed belts, and flat belts are known as transmission belts for transmitting power. The V-belts include a low-edge V-belt with a rubber layer exposed on the side surface for friction transmission, and a Wrapped-type V-belt whose belt is covered with an outer cover. There is a wrapped V-belt that is. These types are used properly as needed due to the difference in required quality. For example, the wrapped V-belt is widely and generally used in general industrial machinery and agricultural machinery.

On the other hand, in applications of textile machines that require double-sided drive and multi-axis transmission due to space problems, or agricultural machines such as a fir tree, a hexagon capable of double-sided transmission, as disclosed in Patent Document 1, for example. A belt (double-Vbelt) is used. This hexagonal belt is also used for roller driving applications in roller type conveyors (roller conveyors, etc.) used in distribution centers and the like. The hexagonal belt described above is configured as an endless transmission belt having a hexagonal cross section, and is configured as a transmission belt capable of transmitting power on both the inner peripheral side surface and the outer peripheral side surface. .. Further, a core wire is provided between the portion of the rubber layer on the inner side in the radial direction and the portion of the rubber layer on the outer side in the radial direction in the hexagonal belt described above.

WO2013 / 069244

By the way, in the device using the hexagonal belt described above, there is a tendency in recent years that the device is required to be compact. As the device using the hexagonal belt becomes more compact, it is required to reduce the diameter of the pulley around which the hexagonal belt is wound and to shorten the distance between the pulleys around which the hexagonal belt is wound. Become. In this case, the hexagonal belt repeatedly orbits a plurality of pulleys under more severe bending deformation conditions corresponding to the reduction in the diameter of the pulleys and the shortening of the distance between the pulleys.

However, in the case of the hexagonal belt disclosed in Patent Document 1, most of the power transmission in the circumferential direction of the hexagonal belt is carried by the tension acting on the core wires dispersed in the width direction of the hexagonal belt. Will be struck. For this reason, when used under more severe bending deformation running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys, the circumferences of the core wires dispersed in the width direction of the hexagonal belt are lined up. Excessive shear stress will be concentrated in the rubber. In this case, excessive heat generation is likely to occur in the rubber around each core wire, which causes deterioration of the durability of the hexagonal belt due to hardening of the rubber with repeated use, and secures a sufficient service life as the hexagonal belt. It's difficult. Therefore, it is desirable to realize a hexagonal belt having a sufficient service life even when used under traveling conditions corresponding to a reduction in the diameter of the pulley and a reduction in the distance between the pulleys.

Further, in a device using a hexagonal belt, in recent years, in addition to making the device compact, there is a tendency that it is required to cope with a high load. For this reason, a hexagonal belt having a sufficient service life not only under running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys, but also under the running conditions with a higher load. Is desirable. When trying to form a hexagonal belt that can withstand a high load, it is conceivable to use a core wire with a large wire diameter. However, in this case, the hexagonal belt is used with high tension, and the high tension also acts on the core wire with a large wire diameter. Therefore, when the hexagonal belt falls into the groove of the pulley, large deformation is likely to occur, and inside the hexagonal belt. A large shear stress is generated in the rubber around the core wire. Then, in particular, peeling is likely to occur at the interface between the adhesive layer for adhering the core wire to the rubber layer and the rubber layer. Therefore, when a hexagonal belt having a large core wire diameter is used in order to cope with a high load traveling condition, it becomes difficult to secure a sufficient service life as the hexagonal belt. Therefore, it is desirable to realize a hexagonal belt having a sufficient service life even when used under high load running conditions.

The present invention is for solving the above problems, and an object of the present invention is to use it under traveling conditions corresponding to a reduction in the diameter of a pulley and a shortening of a distance between pulleys, and under a high load traveling condition. Also, it is to provide a hexagonal belt having a sufficient service life, and a method for manufacturing a hexagonal belt capable of manufacturing the hexagonal belt.

(1) In order to solve the above problems, the hexagonal belt according to a certain aspect of the present invention is a hexagonal belt which is an endless transmission belt having a hexagonal cross section, and is used as a radial inner portion of the hexagonal belt. The width is set to be larger than the thickness of the inner rubber layer provided and having a trapezoidal cross section and the outer rubber layer provided as a radial outer portion of the hexagonal belt and having a trapezoidal cross section. The width direction of the sheet material provided between the inner rubber layer and the outer rubber layer is along the width direction of the hexagonal belt, and the thickness direction of the sheet material is the hexagonal belt. It is provided with a core body that is in a state along the thickness direction of.

According to this configuration, a core body having a sheet material having a width larger than the thickness is provided between the inner rubber layer and the outer rubber layer. Further, the core sheet material extending in the circumferential direction of the hexagonal belt between the inner rubber layer and the outer rubber layer is arranged in a state in which the width direction and the thickness direction correspond to the thickness direction and the width direction of the hexagonal belt. Ru. Therefore, the core body as a reinforcing member on which the tension that bears most of the power transmission in the circumferential direction of the hexagonal belt acts can be extended over a wide range in the width direction of the hexagonal belt. In this way, unlike the conventional hexagonal belt in which the core wires as the reinforcing members are dispersed and arranged in the width direction of the hexagonal belt, the reinforcing members configured as the core body are arranged in a intermittently dispersed manner in the width direction of the hexagonal belt. Will not be done. Therefore, even when the pulley is used under more severe bending deformation running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys, the rubber around the reinforcing member configured as the core body is used. On the other hand, the concentrated action of excessive shear stress is suppressed. As a result, excessive heat generation is unlikely to occur in the rubber around the reinforcing member configured as the core body. Further, since excessive heat generation is unlikely to occur in the rubber around the core body, hardening of the rubber is unlikely to occur even during repeated use, and it is possible to prevent deterioration of the durability of the hexagonal belt. As a result, a sufficient service life of the hexagonal belt can be ensured.

Further, according to the above configuration, when trying to form a hexagonal belt that can withstand a high load, it is not necessary to use a thick core wire as in the conventional case, and the hexagonal belt is relatively thick and arranged in a wide range in the width direction. A thin core body will be used. Therefore, when the hexagonal belt is wound around the pulley and used under high load running conditions, the hexagonal belt is unlikely to be greatly deformed, and the shear generated in the rubber around the core inside the hexagonal belt is generated. The stress is also relatively small. Therefore, peeling at the interface between different layers is less likely to occur. As a result, a sufficient service life as a hexagonal belt can be ensured even when used under high load traveling conditions.

Therefore, according to the above configuration, the hexagonal belt has a sufficient service life even under running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys and the running condition under a high load. Can be provided.

(2) Preferably, in the core body, adjacent portions of the sheet material in the width direction of the hexagon belt do not overlap each other in the thickness direction of the hexagon belt.

In this configuration, the sheet materials adjacent to each other in the width direction of the hexagon belt are arranged in a row along the width direction of the hexagon belt. In other words, one of the adjacent sheet materials is not in a state of riding on the other. As a result, the cores are more evenly arranged along the width direction of the hexagonal belt. Therefore, when a tension acts on the hexagonal belt, the core body can receive the tension more evenly in the width direction of the hexagonal belt. Therefore, the bias of the tension received in the hexagonal belt can be suppressed, and excessive shear stress is further suppressed from being concentrated in the rubber around the reinforcing member configured as the core body. As a result, the service life of the hexagonal belt can be further extended.

(3) Preferably, the core body has a plurality of the sheet materials in a state of being stacked in the thickness direction of the hexagonal belt.

According to this configuration, a core body having a desired thickness can be easily formed by laminating the sheet materials. As a result, it is not necessary to prepare a plurality of types of sheet materials having different thicknesses in advance according to the specifications (size, tensile strength, etc.) required for the hexagonal belt. As a result, the preparation, labor, and time required for manufacturing the hexagonal belt can be reduced. In addition, since it is not necessary to prepare a plurality of types of sheet materials, it is possible to use a wider space for material storage in a hexagonal belt manufacturing factory. Further, since it is not necessary to replace different types of sheet materials, it is not necessary for the worker to frequently move the heavy bobbin around which the sheet material is wound, and the heavy work can be reduced.

(4) More preferably, the edges of the sheet materials adjacent to each other in the width direction of the hexagon belt are abutted at a predetermined abutting position in the width direction of the hexagon belt. Between the sheet materials adjacent to each other in the thickness direction of the hexagonal belt, the abutting position is deviated in the width direction of the hexagonal belt.

According to this configuration, the sheet material is more stable than the case where the abutting positions of the edge ends of the sheet material are aligned in the width direction of the hexagonal belt between the sheet materials adjacent to each other in the thickness direction of the hexagonal belt. It is in a rolled-up state. As a result, when the hexagonal belt is used, each part of the core body can receive tension more evenly. Therefore, the variation in the performance of the hexagonal belt can be suppressed more reliably.

(5) Preferably, the sheet material contains a plurality of first fibers extending in a direction intersecting the circumferential direction of the hexagon belt, and a plurality of second fibers extending in a direction intersecting the first fiber. ing.

For example, when a known hexagonal belt using a core wire as a reinforcing member is used for a roller conveyor having a curved portion (curved portion) in the transport path, a large load is applied to the core wire located on the outside of the curved portion. This may shorten the useful life of the belt as a whole. More specifically, the outer core wire of the known hexagonal belt (hexagonal belt in which the core wire is used as a reinforcing member) when passing through the curved portion has a larger tensile stress than the inner core wire. Occurs. On the other hand, when the known hexagonal belt passes through a straight portion in the transport path of the roller conveyor, the stress acting on each core wire becomes substantially equal. That is, the core wire provided on the outer side of the transport path is subject to greater expansion and contraction fatigue than the core wire provided on the inner side, and the service life of the hexagonal belt is likely to be shortened.

In this regard, according to this configuration, the sheet material is composed of a plurality of first fibers extending along a direction intersecting the circumferential direction of the hexagon belt and a plurality of second fibers extending in a direction intersecting the first fibers. Elasticity can be maintained. As a result, the service life of the hexagonal belt can be extended.

(6) In order to solve the above problems, the method for manufacturing a hexagonal belt according to a certain aspect of the present invention is a method for manufacturing a hexagonal belt which is an endless transmission belt having a hexagonal cross section, and the hexagonal belt is used. An inner belt sleeve forming step and the inner belt that form an endless, unbulked inner belt sleeve that forms the basis of the inner rubber layer, which is the inner peripheral rubber layer (that is, the material of the inner rubber layer). A core body is formed by winding a sheet material around the outer peripheral side of the inner belt sleeve formed in the sleeve forming step, and a rubber layer on the outer peripheral side of the hexagonal belt is formed on the outer peripheral side of the core body. The width of the sheet material includes an outer belt sleeve forming step that forms an endless, unbulked outer belt sleeve that is the basis of the outer rubber layer (ie, the material of the outer rubber layer). , It is set larger than the thickness of the sheet material.

According to this configuration, in the core body forming step, the core body is formed by winding a wide flat sheet material around the outer peripheral side of the inner belt sleeve. Therefore, the region where the core body exists can be made wider in the width direction of the inner belt sleeve, and the core body extends widely also in the width direction of the hexagonal belt. Therefore, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, the core as a reinforcing member in which the tension that bears most of the power transmission in the circumferential direction of the hexagonal belt acts on a wide range in the width direction of the hexagonal belt. The body can be extended. In this way, unlike the conventional hexagonal belt in which the core wires as the reinforcing members are dispersed and arranged in the width direction of the hexagonal belt, the reinforcing members configured as the core body are arranged in a intermittently dispersed manner in the width direction of the hexagonal belt. Will not be done. Therefore, even when the pulley is used under more severe bending deformation running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys, the rubber around the reinforcing member configured as the core body is used. On the other hand, the concentrated action of excessive shear stress is suppressed. As a result, excessive heat generation is unlikely to occur in the rubber around the reinforcing member configured as the core body. Further, since excessive heat generation is unlikely to occur in the rubber around the core body, hardening of the rubber is unlikely to occur even during repeated use, and it is possible to prevent deterioration of the durability of the hexagonal belt. As a result, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, a sufficient service life as the hexagonal belt can be ensured.

Further, when an attempt is made to manufacture a hexagonal belt capable of withstanding a high load by the manufacturing method having the above configuration, it is not necessary to use a thick core wire as in the conventional case, and the hexagonal belt is arranged in a wide range in the width direction of the inner belt sleeve. A relatively thin core body that is arranged in a wide range in the width direction of the belt is used. Therefore, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, when the hexagonal belt is wound around the pulley and used under high load running conditions, the hexagonal belt is unlikely to be greatly deformed. The shear stress generated in the rubber around the core inside the hexagonal belt is also relatively small. Therefore, peeling at the interface between different layers is less likely to occur. As a result, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, it is possible to secure a sufficient service life as the hexagonal belt even when used under high load running conditions.

Therefore, according to the above configuration, the hexagonal belt has a sufficient service life even under running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys and the running condition under a high load. Can provide a method for manufacturing a hexagonal belt.

(7) Preferably, in the core body forming step, the sheet material is formed so that adjacent portions of the sheet material in the width direction of the inner belt sleeve do not overlap each other in the radial direction of the inner belt sleeve. It is wound around the outer peripheral side of the inner belt sleeve.

According to this configuration, the sheet materials adjacent to each other in the width direction of the inner belt sleeve can be arranged in a row along the width direction of the inner belt sleeve. This makes it possible to prevent one of the adjacent sheet materials from riding on the other. As a result, the core body can be arranged more evenly along the width direction of the inner belt sleeve. Therefore, even in the hexagonal belt manufactured by the manufacturing method having the above configuration, the core bodies can be arranged more evenly along the width direction of the hexagonal belt. Therefore, when a tension acts on the hexagonal belt manufactured by the manufacturing method having the above configuration, the core body can receive the tension more evenly in the width direction of the hexagonal belt. Therefore, it is possible to suppress the bias of the tension received in the hexagonal belt manufactured by the manufacturing method having the above configuration, and further, excessive shear stress is concentrated in the rubber around the reinforcing member configured as the core body. It is suppressed. As a result, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, the service life of the hexagonal belt can be further extended.

(8) More preferably, in the core body forming step, the core body is formed by spirally winding the sheet material, and the pitch at which the sheet material is wound on the outer peripheral side of the inner belt sleeve is the said. It is set to be the same as the width of the sheet material.

According to this configuration, the sheet materials adjacent to each other in the width direction of the inner belt sleeve are wound around the inner belt sleeve with no gap in the width direction of the inner belt sleeve. As a result, even in the hexagonal belt manufactured by the manufacturing method having the above configuration, the sheet materials adjacent to each other in the width direction of the hexagonal belt are wound with no gap in the width direction of the hexagonal belt. .. Therefore, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, the core body is arranged over the entire area between both side surfaces of the hexagonal belt regardless of the specifications (thickness of the core body, etc.) required for the hexagonal belt. can do. This eliminates the need to change the pitch at which the core body is wound around the inner belt sleeve according to the specifications required for the hexagonal belt. As a result, it is possible to prevent mistakes such as improper pitch setting due to work mistakes when changing the pitch around the core body around the belt sleeve. As a result, it is possible to reduce the labor involved in manufacturing the hexagonal belt and reduce the occurrence of defective products.

For example, in the conventional case, that is, in the case of manufacturing a hexagonal belt in which the core wire is arranged between the inner rubber layer and the outer rubber layer, the pitch at which the core wire is wound around the inner belt sleeve is set to the center. It is necessary to set according to the diameter of the wire. For this reason, it takes time and effort to set the pitch, and there is a possibility that a mistake in setting the pitch may occur. On the other hand, as described above, by making the width of the sheet material and the pitch at which the sheet material is wound the same, the width of the sheet material and the pitch at which the sheet material is wound are uniquely determined. Therefore, both the trouble of setting the pitch and the possibility of making a mistake in setting the pitch can be reduced.

Further, by forming the core body using a flat sheet material and making the width of the sheet material and the pitch around which the sheet material is wound the same, one of the sheet materials adjacent to each other in the width direction of the inner belt sleeve is the other. It is possible to more surely suppress the ride on the belt. As a result, when the seat material is ridden, it is possible to suppress the occurrence of the work of correcting the ridden portion to a position where the seat material is not ridden. As a result, the labor required for manufacturing the hexagonal belt can be reduced.

Further, for example, in the conventional case, that is, in the case of manufacturing a hexagonal belt in which the core wire is arranged between the inner rubber layer and the outer rubber layer, the pitch when winding the core wire around the inner belt sleeve is increased. It may be almost the same as the diameter of the core wire. In this case, although the pitch is set to be slightly larger than the diameter of the core wire, a phenomenon in which one of the core wires adjacent to each other in the width direction of the inner belt sleeve runs on the other is likely to occur. Such riding occurs due to an error in the position of the core wire when it is wound and a variation in the diameter of the core wire. Then, when the core wire is ridden, it is necessary to correct the ridden portion to a position where it is not ridden. On the other hand, as described above, by making the width of the sheet material and the pitch around which the sheet material is wound the same, it is possible to suppress such riding.

(9) Preferably, in the core body forming step, the core body is formed by laminating the sheet material in the radial direction of the inner belt sleeve.

According to this configuration, a core body having a desired thickness can be easily formed by laminating the sheet materials. As a result, even in the hexagonal belt manufactured by the manufacturing method having this configuration, a core body having a desired thickness can be easily formed. Therefore, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, a plurality of types of sheet materials having different thicknesses are prepared in advance according to the specifications required for the hexagonal belt (differences in hexagonal belt size, tensile strength, etc.). You don't have to prepare for it. As a result, the preparation, labor, and time required for manufacturing the hexagonal belt can be reduced. In addition, since it is not necessary to prepare a plurality of types of sheet materials, it is possible to use a wider space for material storage in a hexagonal belt manufacturing factory. Further, since it is not necessary to replace different types of sheet materials, it is not necessary for the worker to frequently move the heavy bobbin around which the sheet material is wound, and the heavy work can be reduced.

(10) More preferably, the edges of the sheet materials adjacent to each other in the width direction of the inner belt sleeve are abutted at a predetermined abutting position in the width direction of the inner belt sleeve, and the radial direction thereof. The abutting position is shifted in the width direction between the sheet materials adjacent to the sheet material.

According to this configuration, the sheet material is in a state where the abutting positions of the edge ends of the sheet material are aligned in the width direction of the inner belt sleeve between the sheet materials adjacent to each other in the radial direction of the inner belt sleeve. It will be wrapped around the inner belt sleeve in a more stable position. As a result, even in the hexagonal belt manufactured by the manufacturing method having the above configuration, the sheet material is wound in a more stable posture. Therefore, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, each part of the core body can receive tension more evenly when the hexagonal belt is used. Therefore, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, the variation in the performance of the hexagonal belt can be suppressed more reliably.

(11) Preferably, the sheet material includes a plurality of first fibers extending in a direction intersecting the circumferential direction of the inner belt sleeve in a state where the sheet material is wound around the outer peripheral side of the inner belt sleeve, and the said. A plurality of second fibers, which extend in a direction intersecting the first fiber, are included.

For example, when a known hexagonal belt using a core wire as a reinforcing member is used for a roller conveyor having a curved portion in the transport path, a large load is applied to the core wire located on the outer side of the curved portion, and the belt. The overall useful life may be shortened. More specifically, the outer core wire of the known hexagonal belt (hexagonal belt in which the core wire is used as a reinforcing member) when passing through the curved portion has a larger tensile stress than the inner core wire. Occurs. On the other hand, when the known hexagonal belt passes through a straight portion in the transport path of the roller conveyor, the stress acting on each core wire becomes substantially equal. That is, the core wire provided on the outer side of the transport path is subject to greater expansion and contraction fatigue than the core wire provided on the inner side, and the service life of the hexagonal belt is likely to be shortened.

In this regard, according to the above configuration, in a state where the sheet material is wound around the outer peripheral side of the inner belt sleeve, the plurality of first fibers extend in a direction intersecting the circumferential direction of the inner belt sleeve, and the plurality of second fibers are extended. The fiber is in a state of being extended in a direction intersecting with the first fiber. As a result, even in the hexagonal belt manufactured by the manufacturing method having the above configuration, the plurality of first fibers extend in the direction intersecting the circumferential direction of the hexagonal belt, and the plurality of second fibers intersect the first fiber. It will be in a state of being extended to. Therefore, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, a plurality of first fibers extending along a direction intersecting the circumferential direction of the hexagonal belt, and a plurality of first fibers extending in a direction intersecting the first fibers. The elasticity of the sheet material can be maintained by the second fiber. As a result, according to the hexagonal belt manufactured by the manufacturing method having the above configuration, the service life of the hexagonal belt can be further extended.

According to the present invention, a hexagonal belt having a sufficient service life even under running conditions corresponding to a reduction in the diameter of the pulley and a shortening of the distance between the pulleys, and under a high load running condition, and the hexagonal belt thereof. A method for manufacturing a hexagonal belt capable of manufacturing a belt can be provided.

It is a figure which shows typically the whole shape of the hexagonal belt which concerns on one Embodiment of this invention. It is a perspective view which shows a part of the hexagonal belt schematically, and is the figure which shows the part further in the cross section. FIG. 3A is a cross-sectional view of the hexagonal belt. Further, FIG. 3B is an enlarged view schematically showing a portion in the vicinity of the core body in FIG. 3A, and is a diagram for explaining an allowable value of a displacement amount of the core body in the thickness direction. It is a figure which saw a part of the hexagonal belt from the outside in the radial direction, and is the figure which shows the 1st fiber and 2nd fiber contained in a core body typically by a thin solid line. It is a schematic plan view of the bidirectional sheet material which constitutes a sheet material. 6 (A) and 6 (B) are perspective views and cross-sectional views showing a winding step (step S1) of the inner belt sleeve using the molding apparatus, respectively. 7 (A) and 7 (B) are perspective views and cross-sectional views showing a winding step (step S2) of the inner adhesive belt sleeve using the molding apparatus, respectively. 8 (A) and 8 (B) are perspective views and cross-sectional views showing a core body winding step (step S3) using a molding apparatus, respectively. 9 (A) and 9 (B) are perspective views and cross-sectional views showing a winding step (step S4) of the outer adhesive belt sleeve using the molding apparatus, respectively. 10 (A) and 10 (B) are perspective views and cross-sectional views showing a winding step (step S5) of the outer belt sleeve using the molding apparatus, respectively. FIG. 11 (A) is a cross-sectional view showing a cutting step (step S6) of the unvulcanized sleeve, and FIG. 11 (B) is a cross-sectional view showing a skiving step (step S7) of the unvulcanized sleeve. It is a flowchart for demonstrating an example of the manufacturing method of a hexagonal belt. It is a figure for demonstrating an example of the usage form of the hexagonal belt, and is the figure which shows the example which the hexagonal belt is applied to the roller conveyor which has the curved part in the transport path. FIG. 14 (A) is a cross-sectional view taken along the line X1-X1 of FIG. Further, FIG. 14B is an enlarged view of the X2 portion of FIG. 13, which is a diagram schematically showing the first fiber and the second fiber contained in the core body of the hexagonal belt. FIG. 15A is a diagram showing an example in which a known hexagonal belt in which a core wire is used as a reinforcing member is applied to the roller conveyor shown in FIG. 13, and FIG. 15A corresponds to FIG. 14A. FIG. 15 (B) is a diagram corresponding to FIG. 14 (B). It is a figure which shows the cross section of the hexagonal belt which concerns on Example and the comparative example. It is a figure for demonstrating the component of the rubber layer of the hexagonal belt which concerns on Example and comparative example. It is a top view which shows typically the structure of the traveling test apparatus of a hexagonal belt. It is a front view which shows typically the structure of the traveling test apparatus shown in FIG. It is sectional drawing of the hexagonal belt which concerns on a modification. It is sectional drawing which shows a part of the unvulcanized sleeve formed at the time of manufacturing the hexagonal belt which concerns on a modification.

[Hexagonal belt]
Hereinafter, embodiments of the present invention will be described. FIG. 1 is a diagram schematically showing the overall shape of a hexagonal belt according to an embodiment of the present invention. FIG. 2 is a perspective view schematically showing a part of the hexagonal belt, and further shows a part of the hexagonal belt in cross section. FIG. 3A is a cross-sectional view of the hexagonal belt 10 according to the embodiment of the present invention. FIG. 3B is an enlarged view schematically showing a portion in the vicinity of the core body 13 in FIG. 3A, and is a diagram for explaining an allowable value of a deviation amount of the core body 13 in the thickness direction. Further, FIG. 4 is a view of a part of the hexagonal belt 10 viewed from the outside in the radial direction, and is a diagram schematically showing the first fiber 28a and the second fiber 28b contained in the core body 13 with thin solid lines. .. In FIG. 3A, a cross-sectional view showing a detailed cross-sectional structure of the hexagonal belt 10 is shown.

The hexagonal belt 10 shown in FIGS. 1 to 4 has a hexagonal cross section and is configured as an endless transmission belt extending in an annular shape in the circumferential direction. The circumferential direction of the hexagonal belt 10 is the longitudinal direction of the belt. In FIGS. 1 to 4, the circumferential direction of the hexagonal belt 10 is indicated by arrows C1 at both ends, and the width direction of the hexagonal belt 10 is indicated by arrows W1 at both ends. Further, in FIGS. 1 to 3, the radial direction of the hexagonal belt 10 extending in the circumferential direction is indicated by arrows R1 at both ends. The radial direction of the hexagonal belt 10 is configured to extend in the radial direction from the center of the circumference in a state where the hexagonal belt 10 extending in the circumferential direction is arranged in an annular shape along the circumferential direction. Further, the radial direction of the hexagonal belt 10 is a direction corresponding to the thickness direction of the hexagonal belt 10. The width direction of the hexagonal belt 10 is configured as a direction perpendicular to the circumferential direction and the radial direction (thickness direction) of the hexagonal belt 10. The width dimension W, which is the dimension of the hexagonal belt 10 in the width direction W1, is indicated by arrows W at both ends in FIG. 3A. The thickness dimension T, which is the dimension of the hexagonal belt 10 in the radial direction R1, is indicated by arrow T at both ends in FIG. 3A. Further, in the present embodiment, the width direction W1, the axial direction X1, the radial direction R1, and the circumferential direction C1 of the hexagonal belt 10 (each belt sleeve 21, 22, 24, 25 of the unvulcanized sleeve 26 described later) are simply defined. , "Width direction W1", "Axial direction X1", "Diameter direction R1", and "Circular direction C1".

The hexagonal belt 10 according to the present embodiment is formed in an endless shape and is provided so as to extend in an annular shape in the circumferential direction. The cross section of the hexagonal belt 10 perpendicular to the circumferential direction C1 (longitudinal direction of the belt) is formed to have a hexagonal shape. The dimension of the hexagonal belt 10 in the width direction W1 (width dimension W) and the dimension of the hexagonal belt 10 in the radial direction R1 (thickness dimension T) are set as follows, for example. Specifically, in a certain hexagonal belt, the width dimension W is set to 13 mm and the thickness dimension T is set to 10 mm. Further, in a certain hexagonal belt, the width dimension W is set to 17 mm and the thickness dimension T is set to 13 mm. Further, in a certain hexagonal belt, the width dimension W is set to 22 mm and the thickness dimension T is set to 17 mm.

Further, in the hexagonal belt 10, it is preferable that the center line C10 in the thickness direction of the hexagonal belt 10 coincides with the widest portion of the hexagonal belt 10. In FIG. 3A, the center line C10 in the thickness direction of the hexagonal belt 10 is indicated by the alternate long and short dash line C10. Further, in FIG. 3A, both ends of the dimension T1 in the thickness direction of the hexagonal belt 10 between the outer peripheral surface of the hexagonal belt 10 (the outermost surface in the radial direction R1) and the widest portion of the hexagonal belt 10. It is indicated by an arrow T1. Then, in FIG. 3A, the dimension T2 in the thickness direction of the hexagonal belt 10 between the inner peripheral surface of the hexagonal belt 10 (the innermost surface in the radial direction R1) and the widest portion of the hexagonal belt 10 is shown. Both ends are indicated by arrows T2. When the center line C10 in the thickness direction of the hexagonal belt 10 and the widest portion of the hexagonal belt 10 coincide with each other, the dimensions T1 (mm) and the dimension T2 (mm) are the same. However, the dimensions T1 and T2 are allowed as long as they have the following values. Specifically, if T1 = a × 0.5T and T2 = b × 0.5T (however, 0.85 ≦ a, b ≦ 1.15, a + b = 2), it is permissible.

The hexagonal belt 10 according to the present embodiment has an inner rubber layer 11, an inner adhesive rubber layer 12, a core body 13, an outer adhesive rubber layer 14, an outer rubber layer 15, and an outer cover cloth 16. There is. Then, the inner rubber layer 11, the inner adhesive rubber layer 12, the core body 13, the outer adhesive rubber layer 14, and the outer rubber layer 15 are arranged in this order from the inside of the hexagonal belt 10 in the radial direction R1. ..

The inner rubber layer 11 is provided as a radial inner portion of the hexagonal belt 10, and is configured as a portion having a trapezoidal cross section. The inner rubber layer 11 is provided as a portion extending along the circumferential direction of the hexagonal belt 10, and is provided as a long rubber layer having the same length as the hexagonal belt 10. Further, the inner rubber layer 11 has a trapezoidal shape as shown in FIGS. 2 and 3 (A) having a cross section perpendicular to the circumferential direction C1 (longitudinal direction of the belt). The thickness of the inner rubber layer 11 is relatively thick. Examples of the material of the inner rubber layer 11 include natural rubber (NR) and styrene-butadiene rubber (SBR).

The inner adhesive rubber layer 12 is provided for connecting the inner rubber layer 11 and the core body 13, and is arranged on the outer periphery of the inner rubber layer 11. The inner adhesive rubber layer 12 has a substantially trapezoidal shape in cross section perpendicular to the circumferential direction C1 (longitudinal direction of the belt). The thickness of the inner adhesive rubber layer 12 is thinner than the thickness of the inner rubber layer 11. As the material of the inner adhesive rubber layer 12, the same material as the material of the inner rubber layer 11 can be exemplified.

The core body 13 is provided as a portion of the hexagonal belt 10 that mainly receives the tension acting on the hexagonal belt 10. In other words, the core body 13 functions as a reinforcing member for preventing the hexagonal belt 10 from breaking. Examples of the material of the core body 13 include polyester fiber, glass fiber, carbon fiber, and aramid fiber. The core body 13 is arranged in an intermediate portion in the thickness direction of the hexagonal belt 10, and is arranged in the intermediate portion over substantially the entire width direction of the hexagonal belt 10. As described above, the core body 13 is formed in a flat shape in the width direction of the hexagonal belt 10, and can receive tension in a well-balanced manner over the entire width direction. The core body 13 is provided on the outer periphery of the inner adhesive rubber layer 12. That is, the core body 13 is provided on the outer peripheral side of the inner rubber layer 11. Therefore, the core body 13 is arranged radially outward with respect to the inner rubber layer 11 and the inner adhesive rubber layer 12. Further, the outer adhesive rubber layer 14 is arranged on the outer periphery of the core body 13. The outer rubber layer 15 is arranged on the outer periphery of the outer adhesive rubber layer 14. Therefore, the outer rubber layer 15 is provided on the outer peripheral side of the core body 13. Therefore, the core body 13 is arranged radially inside with respect to the outer rubber layer 15 and the outer adhesive rubber layer 14.

With reference to FIG. 3B, the amount d1 (mm) of the radial inward deviation of the center line C13 in the thickness direction of the core body 13 with respect to the center line C10 in the thickness direction of the hexagonal belt 10 is 0. Up to 12 × T1 is acceptable. Similarly, the amount d2 (mm) of the center line C13 displaced outward in the radial direction with respect to the center line C10 is allowed up to 0.12 × T2. In FIG. 3B, the center line C13 in the thickness direction of the core body 13 is shown by the alternate long and short dash line C13, and the deviation amounts d1 and d2 are also shown as lengths sandwiched by arrows.

Although the core body 13 will be described in detail later, the core body 13 is formed by using a long sheet material 23 having a width dimension larger than a thickness dimension. That is, the core body 13 has a sheet material 23 whose width is set to be larger than the thickness. The width dimension of the sheet material 23 is described later on the rubber layers 11, 12, 14, 15 constituting the hexagon belt 10 and the bases thereof (that is, the materials of the rubber layers 11, 12, 14, 15). It is smaller than the width dimension of the rubber sheets 31 and 32 of. In the cross section of the hexagonal belt 10 perpendicular to the circumferential direction C1, as shown in FIG. 3A, the cross sections of the sheet material 23 constituting the core body 13 perpendicular to the circumferential direction C1 are arranged in a row along the width direction W1. The shape is as if they were lined up in. The detailed configuration of the core body 13 and the sheet material 23 used for forming the core body 13 will be described later.

The outer adhesive rubber layer 14 is provided to connect the outer rubber layer 15 and the core body 13. The outer adhesive rubber layer 14 is provided on the outer periphery of the core body 13. The outer adhesive rubber layer 14 has a substantially trapezoidal shape in cross section perpendicular to the circumferential direction C1 (longitudinal direction of the belt). The thickness of the outer adhesive rubber layer 14 is, for example, equivalent to the thickness of the inner adhesive rubber layer 12. Further, as the material of the outer adhesive rubber layer 14, the same material as the material of the inner rubber layer 11 can be exemplified.

The outer rubber layer 15 is provided as a radial outer portion of the hexagonal belt 10, and is configured as a portion having a trapezoidal cross section. The outer rubber layer 15 is provided as a portion extending along the circumferential direction of the hexagonal belt 10, and is provided as a long rubber layer having substantially the same length as the inner rubber layer 11. Further, the outer rubber layer 15 has a structure in which the core body 13 is sandwiched between the outer rubber layer 15 and the inner rubber layer 11 and superposed on the inner rubber layer 11. The outer rubber layer 15 is provided on the outer periphery of the outer adhesive rubber layer 14. That is, the outer rubber layer 15 is provided on the outer peripheral side of the core body 13. The outer rubber layer 15 has a trapezoidal shape as shown in FIGS. 2 and 3 (A) having a cross section perpendicular to the circumferential direction C1 (longitudinal direction of the belt). The thickness of the outer rubber layer 15 is, for example, equivalent to the thickness of the inner rubber layer 11. As the material of the outer rubber layer 15, the same material as the material of the inner rubber layer 11 can be exemplified.

The outer cover 16 has an inner cover 17 and an outer cover 18. The inner cover 17 and the outer cover 18 are provided as canvases that cover the rubber layers 11, 12, 14, 15 and the core 13 described above. The inner cover 17 is provided so as to cover the outer surfaces of the rubber layers 11, 12, 14, 15 and the core body 13 over the entire circumference in the circumferential direction C1. The outer cover 18 is further provided so as to cover the outer surface of the inner cover 17 over the entire circumference in the circumferential direction C1.

[Detailed composition of core and sheet material]
FIG. 5 is a schematic plan view of the bidirectional sheet material 27 constituting the sheet material. As the sheet material 23 used for the core body 13 of the hexagonal belt 10 according to the present embodiment, for example, the bidirectional sheet material 27 as shown in FIG. 5 is used. With reference to FIGS. 4 and 5, the bidirectional sheet material 27 includes a plurality of first fibers 28a extending in a predetermined direction and a plurality of second fibers 28b extending in a direction orthogonal to the first fibers 28a. And are included. Then, in the sheet material 23, the directions in which the first fiber 28a and the second fiber 28b extend extend along the directions intersecting the longitudinal direction of the sheet material 23, respectively. By forming the hexagonal belt 10 using such a sheet material 23, the extending directions of the first fibers 28a and the second fibers 28b contained in the sheet material 23 are the circumferences of the hexagonal belt 10 as shown in FIG. The direction intersects the direction C1. Therefore, the sheet material 23 includes a plurality of first fibers 28a extending in a direction intersecting the circumferential direction C1 of the hexagon belt 10 and a plurality of second fibers 28b extending in a direction intersecting the first fiber 28a. There is. In FIG. 4, the first fiber 28a and the second fiber 28b are schematically shown by thin lines, but even when the hexagonal belt 10 is actually viewed from the outside in the radial direction, the first fiber 28a and the second fiber 28b are shown. Cannot be seen.

With reference to FIG. 2, in the sheet material 23 of the core body 13 provided in the hexagonal belt 10, the first fiber 28a extends along the direction intersecting the circumferential direction C1 of the hexagonal belt 10 and extends. The second fiber 28b extends in a direction intersecting the first fiber 28a. More specifically, the first fiber 28a extends along a direction inclined by 45 degrees with respect to the circumferential direction C1 of the hexagonal belt 10, and the second fiber 28b is along a direction orthogonal to the first fiber 28a. Is extending.

Examples of the first fiber 28a and the second fiber 28b contained in the bidirectional sheet material 27 described above include aramid fiber. For example, when the sheet material 23 as described above is formed by using the bidirectional sheet material 27 using the aramid fiber and the thickness of the sheet material 23 is set to 0.031 mm to 0.24 mm, the tensile strength is 2060 ( It can be set to N / mm ^{2) or higher.}

Further, as the first fiber 28a and the second fiber 28b contained in the above-mentioned bidirectional sheet material 27, for example, carbon fiber can be mentioned as an example. For example, when the sheet material 23 as described above is formed by using the bidirectional sheet material 27 using carbon fibers and the thickness of the sheet material 23 is set to 0.0566 mm to 0.0833 mm, the tensile strength is 2900 ( It can be set to N / mm ^{2) or higher.}

[Manufacturing method of hexagonal belt]
Next, the method for manufacturing the hexagonal belt 10 described above will be described. 6 to 11 are a perspective view schematically showing an example of a molding apparatus 1 for molding the hexagonal belt 10, and a cross-sectional view showing a part of the hexagonal belt 10 formed by the hexagonal belt forming apparatus 1. Is. The hexagonal belt forming apparatus 1 is used for forming the basic shape of the hexagonal belt 10 in the method for manufacturing the hexagonal belt 10. In the following, the hexagonal belt forming apparatus 1 may be simply referred to as a forming apparatus 1. FIG. 12 is a flowchart for explaining an example of a method for manufacturing the hexagonal belt 10. The hexagonal belt 10 according to the present embodiment can be formed without using the molding apparatus 1 described below, and can be manufactured by a method other than the manufacturing method using the molding apparatus 1 described below. You can also.

6 (A) and 6 (B) are perspective views and cross-sectional views showing a winding step (step S1, inner belt sleeve forming step) of the inner belt sleeve 21 using the molding apparatus 1, respectively. 7 (A) and 7 (B) are perspective views and cross-sectional views showing a winding step (step S2) of the inner adhesive belt sleeve 22 using the molding apparatus 1, respectively. 8 (A) and 8 (B) are perspective views and cross-sectional views showing a winding step (step S3, core body forming step) of the core body 13 using the molding apparatus 1, respectively. 9 (A) and 9 (B) are perspective views and cross-sectional views showing a winding step (step S4) of the outer adhesive belt sleeve 24 using the molding apparatus 1, respectively. 10 (A) and 10 (B) are perspective views and cross-sectional views showing a winding step (step S5, outer belt sleeve forming step) of the outer belt sleeve 25 using the molding apparatus 1, respectively. FIG. 11A is a cross-sectional view showing a cutting step (step S6, cutting step) of the unvulcanized sleeve 26. FIG. 11B is a cross-sectional view showing a skiving step (step S7, skiving step) of the unvulcanized sleeve 26.

First, in step S1 (the step of winding the inner belt sleeve 21), as shown in FIGS. 6 (A) and 6 (B), the pre-formed wide unvulcanized rubber sheet 31 is formed into a columnar shape. Alternatively, the cylindrical inner belt sleeve 21 is formed by being wound around a mantle 3 configured as a cylindrical mold and being joined to each other in a state where both ends thereof are abutted against each other. That is, in step S1, the winding step of the inner belt sleeve 21 is performed. In this winding step, the mantle 3 is used to support the inner belt sleeve 21 having flexibility as a processing target from the inner peripheral side of the inner belt sleeve 21 to hold the inner belt sleeve 21 in a circular shape. This is a process of winding the inner belt sleeve 21. In this embodiment, step S1 (the step of winding the inner belt sleeve 21) is the basis of the inner rubber layer 11 which is the rubber layer on the inner peripheral side of the hexagonal belt 10 (that is, the material of the inner rubber layer 11). It constitutes an inner belt sleeve forming step, which forms an endless unvulcanized inner belt sleeve 21.

The width direction, the radial direction, and the circumferential direction of the inner belt sleeve 21 correspond to the circumferential direction C1, the radial direction R1, and the width direction W1 of the hexagonal belt 10. Therefore, in FIG. 6, regarding the direction of the inner belt sleeve 21, the circumferential direction C1 is indicated by both-end arrows C1, the radial direction R1 is indicated by both-end arrows R1, and the width direction W1 is indicated by both-end arrows W1. .. Further, the axial direction X1 of the mantle 3 is also indicated by arrows X1 at both ends in FIG. The axial direction X1 of the mantle 3 is parallel to the width direction W1 of the inner belt sleeve 21. The width direction, radial direction, and circumferential direction of the inner adhesive belt sleeve 22, the outer adhesive belt sleeve 24, the outer belt sleeve 25, the unvulcanized sleeve 26, and the unvulcanized belt 20, which will be described later, are the hexagonal belt 10 and the inner side. It corresponds to the circumferential direction C1, the radial direction R1, and the width direction W1 of the belt sleeve 21. Therefore, also in FIGS. 7 to 11, regarding the directions of the sleeves (22, 24, 25, 26) and the unvulcanized belt 20, the circumferential direction C1 is indicated by the double-ended arrow C1, and the radial direction R1 is indicated by the double-ended arrow. It is indicated by R1, and the width direction W1 is indicated by arrow W1 at both ends. Further, in FIGS. 7 to 11, the axial direction X1 of the mantle 3 is also indicated by arrow X1 at both ends.

Next, in step S2, as shown in FIGS. 7 (A) and 7 (B), a pre-formed wide unvulcanized rubber sheet 32 is formed on the outer periphery of the mantle 3 as an inner belt sleeve. A cylindrical inner adhesive belt sleeve 22 is formed by being wound around the outer circumference of 21 and being joined to each other in a state where both ends thereof are abutted against each other. The rubber sheet 32 used here is a rubber sheet as an adhesive layer which is thinner than the rubber sheet 31 used in step S1 and has adhesiveness.

Next, in step S3 (the step of winding the core body 13), as shown in FIGS. 8 (A) and 8 (B), the pre-formed long sheet material 23 is attached to the inner adhesive belt sleeve 22. The step of forming the core body 13 is performed by spirally winding the core body 13 around the outer circumference of the core body 13. In step S3 (the step of winding the core body 13), in the present embodiment, the sheet material 23 is wound around the outer peripheral side of the inner belt sleeve 21 formed in the inner belt sleeve forming step (step S2) to form the core body. It constitutes a core body forming step, which forms 13.

More specifically, in step S3, the worker first fixes one end of the sheet material 23 to the mantle 3. From this state, the rotation of the mantle 3 pulls the sheet material 23 toward the mantle 3 and winds it around the mantle 3. Further, by shifting the position where the sheet material 23 is wound around the mantle 3 along the axial direction X1, the sheet material 23 is spirally wound. As a result, the core body 13 is formed.

In the present embodiment, the core body 13 having a relatively small thickness is formed by winding one layer (1 ply) of the sheet material 23 around the mantle 3. In this case, the sheet materials 23 adjacent to each other in the direction parallel to the axial direction X1 of the mantle 3 (the portions of the sheet materials 23 adjacent to the width direction W1) are prevented from overlapping each other in the radial direction R1. 3. It is wound around the inner belt sleeve 21 and the inner adhesive belt sleeve 22. In this case, the pitch P23, which is the dimension of the interval at which the sheet material 23 is wound along the width direction W1 on the outer peripheral side of the inner belt sleeve 21, is the width W23 of the sheet material 23 (the dimension in the width direction W1 of the sheet material 23). It is set to the same. As a result, the sheet materials 23 are wound around the mantle 3 in a state where the sheet materials 23 adjacent to each other in the direction parallel to the axial direction X1 are in close contact with each other.

By the above steps, the core body 13 formed of the one-layer sheet material 23 is completed on the outer periphery of the mantle 3. After the core body 13 is completed, the sheet material 23 at the position before being wound around the mantle 3 is cut by a cutter (not shown).

Next, in step S4, as shown in FIGS. 9A and 9B, a pre-vulcanized rubber sheet 32 is wound around the outer periphery of the core body 13 and both ends thereof are abutted against each other. The cylindrical outer adhesive belt sleeve 24 is formed by being joined to each other in this state. In step S4, for example, a rubber sheet as the same adhesive layer as the rubber sheet 32 used in step S2 is used.

Next, in step S5 (the step of winding the outer belt sleeve 25), as shown in FIGS. 10A and 10B, the pre-vulcanized unvulcanized rubber sheet 31 is attached to the outer adhesive belt sleeve 24. A cylindrical outer belt sleeve 25 is formed by being wound around the outer circumference of the belt and being joined to each other in a state where both ends thereof are abutted against each other. As a result, the unvulcanized sleeve 26 is completed. In this way, an unvulcanized sleeve 26 (a laminate of an inner belt sleeve 21, an inner adhesive belt sleeve 22, a core body 13, an outer adhesive belt sleeve 24, and an outer belt sleeve 25) is formed on the mantle 3. In this embodiment, step S5 (the step of winding the outer belt sleeve 25) is the base of the outer rubber layer 15 which is the rubber layer on the outer peripheral side of the hexagonal belt 10 on the outer peripheral side of the core body 13 (that is,). It constitutes an outer belt sleeve forming step, which forms an endless unvulcanized outer belt sleeve 25 (which is a material for the outer rubber layer 15).

Next, in step S6, a cutting step is performed. In the cutting step, the unvulcanized sleeve 26 is cut by a cutter (not shown) at predetermined intervals along the axial direction X1. As a result, the unvulcanized belt 20 made of a part of the unvulcanized sleeve 26 is manufactured (see FIG. 11 (A)). In step S6 (cutting step), in the present embodiment, the unvulcanized sleeve 26 including the inner belt sleeve 21, the core body 13, and the outer belt sleeve 25 is placed in the circumferential direction of the unvulcanized sleeve 26. It constitutes a cut step, which is cut along the line to form an unvulcanized belt 20.

Next, in step S7, as shown in FIG. 11B, a skiving step is performed. In the skiving step, both side surfaces of the unvulcanized belt 20 are scraped so that the cross section perpendicular to the circumferential direction C1 of the unvulcanized belt 20 has a hexagonal shape. In step S7 (skibing step), in the present embodiment, both sides of the unvulcanized belt 20 in the width direction so that the cross section of the unvulcanized belt 20 perpendicular to the circumferential direction of the unvulcanized belt 20 has a hexagonal shape. It constitutes a vulcan step, which scrapes the surface.

Next, in step S8, although not shown, a cover winding step is performed. In the cover winding step, the outer cover cloth 16 is wound around the unvulcanized belt 20 that has undergone the skive step, and the outer surface of the unvulcanized belt 20 is covered with the outer skin cloth 16 over the entire circumference of the unvulcanized belt 20 in the circumferential direction C1. Be covered. In step S8 (cover winding step), in the present embodiment, the outer surface of the unvulcanized belt 20 whose both side surfaces have been scraped by the skive step is covered with the outer skin cloth 16 over the entire circumference in the circumferential direction C1. It is configured as a winding step.

Finally, in step S9, the unvulcanized belt 20 whose outer surface is covered with the outer skin cloth 16 over the entire circumference in the circumferential direction C1 is vulcanized while being held by a predetermined mold. A vulcanization process is performed. When step S9 is completed, the rubber portion of the unvulcanized belt 20 is vulcanized, and the hexagonal belt 10 is completed. In this embodiment, step S9 (vulcanization step) is configured as a vulcanization step in which the unvulcanized belt 20 whose outer surface is covered with the outer cover 16 is vulcanized by the cover winding step.

The core body 13 of the hexagonal belt 10 formed as described above has the following configuration. Specifically, referring to FIG. 3A, in the core body 13, the width direction of the sheet material 23 provided between the inner rubber layer 11 and the outer rubber layer 15 is the width direction of the hexagonal belt 10. It is in a state of being along W1 and the thickness direction of the sheet material 23 is along the thickness direction (diameter direction R1) of the hexagonal belt 10. Further, referring to FIG. 3A, in the core body 13, the edges of the portions of the sheet material 23 that are adjacent to each other in the width direction W1 of the hexagon belt 10 are predetermined in the width direction W1 of the hexagon belt 10. It is in a state of being butted at the butted position. Therefore, in the core body 13, adjacent portions of the sheet material 23 in the width direction W1 of the hexagon belt 10 do not overlap each other in the thickness direction (diameter direction R1) of the hexagon belt 10.

[Example of usage of hexagonal belt]
FIG. 13 is a diagram for explaining an example of a usage mode of the hexagonal belt, and is a diagram showing an example in which the hexagonal belt is applied to a roller conveyor 50 having a curved portion (curved portion 52) in the transport path 51. Is. FIG. 13 is a view of the curved portion 52 of the roller conveyor 50 as viewed from above. FIG. 14 (A) is a cross-sectional view taken along the line X1-X1 of FIG. Further, FIG. 14B is an enlarged view of the X2 portion (the region surrounded by the thin line with the reference numeral X2) of FIG. 13, and the first fiber 28a and the first fiber 28a included in the core body 13 of the hexagonal belt 10 are shown. It is a figure which shows 2 fibers 28b schematically.

In the roller conveyor 50, a plurality of rollers 55 are provided on the transport path 51. Each roller 55 is integrally provided with a pulley 56 coaxial with the roller 55, and a hexagonal belt is fitted into a groove portion 56a formed on the outer peripheral surface of each pulley 56. Then, in the roller conveyor 50, each roller 55 is rotated by moving the hexagonal belt so as to circulate by an electric motor (not shown) as a drive source. As a result, the object to be transported placed on the roller 55 can be moved along the transport path 51.

FIG. 15 is a diagram showing an example in which a known hexagonal belt 100 using a core wire 101 as a reinforcing member is applied to the roller conveyor 50, and FIG. 15 (A) corresponds to FIG. 14 (A). FIG. 15 (B) is a diagram corresponding to FIG. 14 (B). A roller conveyor 50 having a curved portion 52 as shown in FIG. 13 for a hexagonal belt 100 having a conventionally known configuration as shown in FIG. 15 (that is, a hexagonal belt in which a core wire 101 is used as a reinforcing member). When used in, the following problems occur. Specifically, with reference to FIG. 15, among the plurality of core lines 101 in the hexagonal belt 100, the core line (outermost core line 101a) arranged on the outermost side of the curved portion 52 is the core line (outermost core line 101a) of the curved portion 52. A tensile force larger than that of the core wire 101 acts. Therefore, the outermost core wire 101a has a larger expansion and contraction fatigue than the other core wires 101, and there is a high possibility that the outermost core wire 101a will be cut at an early stage.

In this regard, in the hexagonal belt 10 according to the present embodiment, the first fibers 28a and the second fibers 28b contained in the sheet material 23 used as the reinforcing member extend in a direction intersecting the longitudinal direction of the hexagonal belt 10. ing. By doing so, it is possible to eliminate fibers on which the tensile force acts intensively like the outermost core wire 101a of the known hexagonal belt 100, and it is possible to give the sheet material 23 elasticity. As a result, the service life of the hexagonal belt 10 can be extended.

[Example]
Next, an example of the hexagonal belt 10 of the above-described embodiment will be described. FIG. 16 is a diagram showing a cross section of a hexagonal belt according to an example and a comparative example. Note that FIG. 16A is a diagram schematically showing a cross section of the hexagonal belt 10 according to the embodiment of the present embodiment. FIG. 16B is a diagram schematically showing a cross section of the hexagonal belt 100 according to the comparative example. 16 (A) and 16 (B) show a cross section of the hexagonal belt (10, 100) perpendicular to the circumferential direction C1. In FIGS. 16A and 16B, regarding the direction of the hexagonal belt (10, 100), the radial direction R1 is indicated by the double-ended arrow R1, and the width direction W1 is indicated by the double-ended arrow W1. ..

The hexagonal belt 10 according to the embodiment includes an inner rubber layer 11, an inner adhesive rubber layer 12, an outer rubber layer 15, an outer adhesive rubber layer 14, a core body 13, and an outer skin cloth 16.

The hexagonal belt 100 according to the comparative example includes an inner first rubber layer 102, an inner second rubber layer 103, an outer first rubber layer 104, an outer second rubber layer 105, a core wire 101, and an outer skin cloth 106. There is. The inner first rubber layer 102 is provided as a rubber layer corresponding to the inner rubber layer 11 of the hexagonal belt 10 according to the embodiment. The inner second rubber layer 103 is provided as a rubber layer corresponding to the inner adhesive rubber layer 12 of the hexagonal belt 10 according to the embodiment. The outer first rubber layer 104 is provided as a rubber layer corresponding to the outer rubber layer 15 of the hexagonal belt 10 according to the embodiment. The outer second rubber layer 105 is provided as a rubber layer corresponding to the outer adhesive rubber layer 14 of the hexagonal belt 10 according to the embodiment. The core wire 101 is provided as a core wire having a circular cross section extending along the circumferential direction C1 of the hexagonal belt 100, and is dispersed and arranged side by side in the width direction W1 of the hexagonal belt 100.

FIG. 17 is a diagram for explaining the components of the rubber layer of the hexagonal belts (10, 100) according to the examples and the comparative examples, and is a diagram shown in a list. In addition, FIG. 17A shows the components of the inner rubber layer 11 and the outer rubber layer 15 of the hexagonal belt 10 according to the embodiment, and the inner first rubber layer 102 and the outer first rubber layer 102 of the hexagonal belt 100 according to the comparative example. It is a figure which shows the component of 104 in a list. That is, the rubber layer (11, 15) of the hexagonal belt 10 according to the embodiment and the rubber layer (102, 104) of the hexagonal belt 100 according to the comparative example have the same components, and are as shown in FIG. 17 (A). Is. Further, FIG. 17B shows the components of the inner adhesive rubber layer 12 and the outer adhesive rubber layer 14 of the hexagonal belt 10 according to the embodiment, and the inner second rubber layer 103 and the outer second rubber layer 103 of the hexagonal belt 100 according to the comparative example. It is a figure which shows the component of the rubber layer 105 in a list. That is, the rubber layer (12, 14) of the hexagonal belt 10 according to the embodiment and the rubber layer (103, 105) of the hexagonal belt 100 according to the comparative example have the same components, and are as shown in FIG. 17 (B). Is.

The sheet material 23 constituting the core body 13 of the hexagonal belt 10 according to the embodiment is a bidirectional sheet material 27 using aramid fibers, which has a thickness of 0.193 mm and a tensile strength of 2060 (N / mm ^2). The bidirectional sheet material 27 set in) was used. On the other hand, as the core wire 101 of the hexagonal belt 100 according to the comparative example, a core wire 101 which is a twisted cord of polyester fiber and has an average wire diameter of 1.985 mm was used. The same outer cloth 16 of the hexagonal belt 10 according to the example and the outer cloth 106 of the hexagonal belt 100 according to the comparative example were used. Specifically, as the outer coat 16 and the outer coat 106, plain weave cotton woven fabrics in which the yarn densities of the warp and weft yarns were set to 75/50 mm were used.

As the evaluation of the hexagonal belt 10 according to the example and the hexagonal belt 100 according to the comparative example, the service life was evaluated using a traveling test apparatus. FIG. 18 illustrates the configuration of the hexagonal belt running test device 60 (hereinafter, simply referred to as “running test device 60”) used for evaluating the service life of the hexagonal belt 10 according to the embodiment and the hexagonal belt 100 according to the comparative example. It is a plan view which shows. FIG. 19 is a front view schematically showing the configuration of the traveling test device 60.

The traveling test device 60 is an apparatus constructed assuming that a hexagonal belt is used under traveling conditions corresponding to a reduction in the diameter of the pulley and a shortening of the distance between the pulleys and under high load traveling conditions. is there. The traveling test device 60 includes a drive pulley 61, an electric motor 62 that rotationally drives the drive pulley 61, a plurality of rollers 55, and a plurality of driven pulleys 56.

The drive pulley 61 is a pulley having a diameter of 80 mm that rotates around the rotation shaft 63, and is configured as a pulley that applies a driving force to the hexagonal belt. The plurality of rollers 55 are configured in the same manner as the plurality of rollers 55 of the roller conveyor 50 shown in FIG. The plurality of driven pulleys 56 are configured in the same manner as the plurality of pulleys 56 of the roller conveyor 50 shown in FIG. Each driven pulley 56 is integrally provided coaxially with each roller 55. The diameter of each driven pulley 56 is set to 150 mm. In the traveling test device 60, the plurality of rollers 55 and the plurality of driven pulleys 56 are arranged so as to form a curved portion 52 similar to the curved portion 52 of the roller conveyor 50 shown in FIG. Further, in the traveling test device 60, the plurality of driven pulleys 56 are arranged along a horizontal plane having the same height. On the other hand, the drive pulley 61 is arranged below the plurality of driven pulleys 56. That is, the drive pulley 61 is arranged at a position lower than the plurality of driven pulleys 56 in the vertical direction.

The hexagonal belt traveling in the traveling test device 60 travels in a state of being wound around the drive pulley 61 and the plurality of driven pulleys 56. Therefore, the hexagonal belt traveling in the traveling test device 60 travels along the curved portion 52 in the region wound around the plurality of driven pulleys 56. Then, the hexagonal belt is transferred from one of the driven pulleys 56 arranged at both ends of the curved portion 52 among the plurality of driven pulleys 56 to the other of the driven pulleys 56 arranged at both ends of the curved portion 52 via the drive pulley 61. In the area where the belt is wound, the vehicle travels under traveling conditions corresponding to the reduction in the diameter of the pulley and the shortening of the distance between the pulleys.

In the service life evaluation using the running test device 60, the hexagonal belt 10 according to the example and the hexagon belt 100 according to the comparative example were run under the same running conditions, the durability was confirmed, and the service life was evaluated. In both the running test of the hexagonal belt 10 and the hexagonal belt 100 according to the comparative example, the rotation speed of the drive pulley 61 is set to 450 rpm, and the tension applied to the hexagonal belt (10, 100) is set to a high load. It was set to a certain 40 kgf. In addition, the evaluation items in the service life evaluation in the above-mentioned running test using the running test device 60 include the running time until capsizing from the pulley (61, 56) and the hexagonal belt (10, 100). We confirmed the running time until cracks occurred. In addition, in FIG. 19, the outer shape of the pulley (61, 56) of the traveling test apparatus 60 is schematically shown. Further, in FIG. 19, the hexagonal belt 10 according to the embodiment and the hexagonal belt 100 according to the comparative example, which are wound around the pulleys (61, 56) and travel in the traveling test apparatus 60, are schematically shown by thick lines. ..

In the case of a hexagonal belt that cannot secure a sufficient service life under running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys and under high load running conditions, the running test device 60 When the above-mentioned running test using the above-mentioned is performed, excessive heat generation is generated in the rubber around the reinforcing member. Then, the rubber is hardened with repeated use during the running test for a long period of time, which causes deterioration of the durability of the hexagonal belt. In addition, large deformations occur repeatedly in the hexagonal belt, and peeling at the interface between different layers is likely to occur inside the hexagonal belt. In these cases, first, cracks occur in the hexagonal belt. When the cracks grow to some extent, stable running along the pulley becomes difficult, and the cracks capsize and fall off the pulley. The traveling time that can be judged to have secured a sufficient service life as a hexagonal belt was set to 480 hours. That is, when cracks did not occur and capsizing did not occur for 480 hours, it was determined that a sufficient service life of the hexagonal belt could be secured.

Further, in the above-mentioned running test using the running test device 60, two hexagonal belts 10 according to the example and two hexagonal belts 100 according to the comparative example were produced and tested respectively. That is, in the test of the hexagonal belt 10 according to the example, two test objects were prepared and each was tested. Similarly, in the test of the hexagonal belt 100 according to the comparative example, two test objects were prepared and each was tested.

As a result of the above-mentioned running test using the running test device 60, the first test target of the hexagonal belt 100 according to the comparative example had a crack in 222 hours from the start of running, and further capsized in 262 hours from the start of running. Occurred and fell off the pulley, making it impossible to continue the running test. Then, in the second test target of the hexagonal belt 100 according to the comparative example, a crack occurred 244 hours after the start of running, and further, capsizing occurred 289 hours after the start of running, and the belt fell off from the pulley to perform a running test. It became impossible to continue.

On the other hand, as a result of the above-mentioned running test using the running test device 60, the first test target of the hexagonal belt 10 according to the embodiment did not crack even after 480 hours from the start of running, and capsized. Stable running was continued without any occurrence. Then, the second test target of the hexagonal belt 10 according to the embodiment also continued stable running without cracking and capsizing even after 480 hours from the start of running. Therefore, the hexagonal belt 10 according to the embodiment has a sufficient service life even when used under traveling conditions corresponding to a reduction in the diameter of the pulley and a shortening of the distance between the pulleys and under a high load traveling condition. It was confirmed that it had. Further, it was confirmed that the hexagonal belt 10 according to the embodiment has a sufficient service life even under traveling conditions in which the curved portion 52 is repeatedly traveled.

[effect]
As described above, according to the hexagonal belt 10 according to the present embodiment, the core body 13 provided with the sheet material 23 having a width larger than the thickness is provided between the inner rubber layer 11 and the outer rubber layer 15. Further, the sheet material 23 of the core body 13 extending in the circumferential direction C1 of the hexagonal belt 10 between the inner rubber layer 11 and the outer rubber layer 15 has its width direction and thickness direction in the thickness direction and the width direction of the hexagonal belt 10. It is placed in a corresponding state. Therefore, the core body 13 as a reinforcing member on which the tension that bears most of the power transmission in the circumferential direction C1 of the hexagonal belt 10 acts can be extended over a wide range in the width direction W1 of the hexagonal belt 10. In this way, unlike the conventional hexagonal belt in which the core wires as the reinforcing members are dispersed and arranged in the width direction of the hexagonal belt, the reinforcing members configured as the core body 13 are dispersed intermittently in the width direction of the hexagonal belt. Will not be placed. Therefore, even when the pulley is used under more severe bending deformation running conditions corresponding to the reduction in the diameter of the pulley and the shortening of the distance between the pulleys, the rubber around the reinforcing member configured as the core body 13 On the other hand, the concentrated action of excessive shear stress is suppressed. As a result, excessive heat generation is unlikely to occur in the rubber around the reinforcing member configured as the core body 13. Further, since excessive heat generation is unlikely to occur in the rubber around the core body 13, hardening of the rubber is unlikely to occur even during repeated use, and it is possible to prevent deterioration of the durability of the hexagonal belt 10. As a result, a sufficient service life of the hexagonal belt 10 can be ensured.

Further, according to the hexagonal belt 10 according to the present embodiment, when trying to form a hexagonal belt that can withstand a high load, it is not necessary to use a thick core wire as in the conventional case, and the hexagonal belt 10 has a wide range in the width direction W1. A relatively thin core body 13 arranged in is used. Therefore, when the hexagonal belt 10 is wound around a pulley and used under a high load running condition, the hexagonal belt 10 is less likely to be greatly deformed, and the rubber around the core body 13 inside the hexagonal belt 10 is hard to occur. The shear stress generated in the belt is also relatively small. Therefore, peeling at the interface between different layers (for example, the interface between the inner rubber layer 11 and the inner adhesive rubber layer 12, the interface between the inner adhesive rubber layer 12 and the core body 13 and the like) is less likely to occur. As a result, a sufficient service life of the hexagonal belt 10 can be ensured even when used under high load traveling conditions.

Therefore, according to the present embodiment, the hexagonal belt has a sufficient service life even under running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys and the running condition under a high load. 10 can be provided. According to the present embodiment, the hexagonal belt 10 has a sufficient service life even under running conditions corresponding to a reduction in the diameter of the pulley and a shortening of the distance between the pulleys and a high load running condition. Can provide a method for manufacturing a hexagonal belt 10.

Further, in the hexagonal belt 10, the sheet materials 23 adjacent to the width direction W1 are arranged in a row along the width direction W1. In other words, one of the adjacent sheet materials 23 is not in a state of riding on the other. As a result, the core body 13 is more evenly arranged along the width direction W1 of the hexagonal belt 10. Therefore, when a tension acts on the hexagonal belt 10, the core body 13 can receive the tension more evenly with respect to the width direction W1 of the hexagonal belt. Therefore, the bias of the tension received in the hexagonal belt 10 can be suppressed, and excessive shear stress is further suppressed from being concentrated in the rubber around the reinforcing member configured as the core body. As a result, the service life of the hexagonal belt 10 can be further extended.

By the way, for example, referring to FIGS. 13 and 15, when a known hexagonal belt 100 using a core wire 101 as a reinforcing member is used for the roller conveyor 50 having the curved portion 52 in the transport path 51, the curved portion A large load is applied to the outermost core wire (outermost core wire 101a) in 52, and the service life of the hexagonal belt 100 as a whole may be shortened. More specifically, the outermost core wire 101a of the hexagonal belt 100 when passing through the curved portion 52 is subjected to a larger tensile stress than the core wire 101 located inside. On the other hand, when the known hexagonal belt 100 passes through a straight portion in the transport path 51 of the roller conveyor 50, the stress acting on each core wire 101 becomes substantially equal. That is, the outermost core wire 101a is subject to greater expansion and contraction fatigue than the other core wires 101, and as a result, the service life of the hexagonal belt 100 is likely to be shortened.

Regarding this point, according to the hexagonal belt 10, as shown in FIG. 4, a plurality of first fibers 28a extending along a direction intersecting the circumferential direction C1 (longitudinal direction) of the hexagonal belt 10 and the first fibers 28a. The elasticity of the sheet material 23 can be maintained by the plurality of second fibers 28b extending in the direction intersecting with the sheet material 23. As a result, the service life of the hexagonal belt 10 can be extended.

Further, according to the method for manufacturing the hexagonal belt 10 according to the present embodiment, the width W23 of the sheet material 23 used in the core body forming step (step S3) is set to be larger than the thickness of the sheet material 23. According to this configuration, in the core body forming step (step S3), the core body 13 is formed by winding the wide flat sheet material 23 around the inner adhesive belt sleeve 22 on the outer peripheral side of the inner belt sleeve 21. Therefore, the region where the core body 13 exists can be made wider in the width direction W1. In the present embodiment, after the unvulcanized sleeve 26 including the unvulcanized belt sleeves 21, 22, 24, 25 and the core 13 is formed, the unvulcanized sleeve 26 is cut by a predetermined width, and further. The unvulcanized belt 20 is formed by performing a skiving operation in which the cut member is shaved so as to have a hexagonal cross section. As described above, since the region where the core body 13 exists in the width direction W1 is wide, the core body is formed on both side surfaces of the unvulcanized belt 20 (surfaces facing the sheave surface of the pulley and both end surfaces in the width direction W1). 13 appears continuously in the circumferential direction C1 of the unvulcanized belt 20. As a result, on each side surface of the unvulcanized belt 20, the core body 13 appears with a sufficient length in the circumferential direction C1 of the unvulcanized belt 20. As a result, the core body 13 can receive sufficient tension on the side surface of the hexagonal belt 10 which is completed by subjecting the unvulcanized belt 20 to a vulcanization treatment or the like. As a result, the tension that the hexagonal belt 10 can practically receive can be increased. Further, since the region where the core body 13 exists in the width direction W1 is wide, it is possible to more reliably prevent the core body 13 from appearing intermittently in the circumferential direction C1 on both side surfaces of the unvulcanized belt 20. Therefore, it is possible to prevent individual differences in the tension that the core body 13 can receive on the side surface of the hexagonal belt 10. Thereby, the variation in the performance of the hexagonal belt 10 can be further reduced. Further, since the sheet material 23 has a wide range of shapes, the number of times of winding around the inner adhesive belt sleeve 22 can be reduced. Therefore, since the time required for forming the core body 13 can be reduced, the time required for manufacturing the hexagonal belt 10 can be further reduced.

Further, when an attempt is made to manufacture a hexagonal belt capable of withstanding a high load by the manufacturing method of the hexagonal belt 10 according to the present embodiment, it is not necessary to use a thick core wire as in the conventional case, and the inner belt sleeve 21 is wide in the width direction. A relatively thin core body 13 that is arranged in a range and is arranged in a wide range even in the width direction of the hexagonal belt 10 is used. Therefore, according to the hexagonal belt 10 manufactured by the method for manufacturing the hexagonal belt 10 according to the present embodiment, when the hexagonal belt 10 is wound around a pulley and used under high load running conditions, the hexagonal belt 10 is used. In No. 10, large deformation is unlikely to occur, and the shear stress generated in the rubber around the core body 13 inside the hexagonal belt 10 is also relatively small. Therefore, peeling at the interface between different layers (for example, the interface between the inner rubber layer 11 and the inner adhesive rubber layer 12, the interface between the inner adhesive rubber layer 12 and the core body 13 and the like) is less likely to occur. As a result, according to the hexagonal belt 10 manufactured by the method for manufacturing the hexagonal belt 10 according to the present embodiment, a sufficient service life as the hexagonal belt 10 can be ensured even when used under high load running conditions. Can be done.

Further, according to the present embodiment, the sheet material 23 is an inner adhesive belt sleeve on the outer peripheral side of the inner belt sleeve 21 so that adjacent portions of the sheet material 23 in the width direction W1 do not overlap each other in the radial direction R1. Wrapped in 22. According to this configuration, the sheet materials 23 adjacent to the width direction W1 can be arranged in a row along the width direction W1. This makes it possible to prevent one of the adjacent sheet materials 23 from riding on the other. As a result, the core body 13 can be arranged more evenly along the width direction W1. Therefore, even in the hexagonal belt 10 manufactured by the method for manufacturing the hexagonal belt 10 according to the present embodiment, the core body 13 can be arranged more evenly along the width direction W1 of the hexagonal belt 10. Therefore, when a tension acts on the hexagonal belt 10, the core body 13 can receive the tension more evenly in the width direction W1. Therefore, it is possible to suppress the bias of the tension received in the hexagonal belt 10 manufactured by the manufacturing method of the hexagonal belt 10 according to the present embodiment, and an excessive shear stress is generated in the rubber around the reinforcing member configured as the core body 13. Concentrated occurrence is further suppressed. As a result, according to the hexagonal belt 10 manufactured by the method for manufacturing the hexagonal belt 10 according to the present embodiment, the useful life of the hexagonal belt 10 can be further extended.

For example, in a hexagonal belt having a conventional configuration, that is, a hexagonal belt in which a core wire is arranged between an inner rubber layer and an outer rubber layer, when a thin core wire is wound around a belt sleeve that is the inner rubber layer, the core wire is connected. The position tends to deviate from the design position. Therefore, the position of the core wire in the width direction of the belt sleeve is likely to be displaced. As a result, the position of the core wire varies in one unvulcanized belt formed by cutting the belt sleeve at a predetermined width. Further, the effective number of core wires (the number of core wires on the cut surface) varies among the plurality of unvulcanized belts. The causes of such variations include variations in the pitch when winding the core wires, variations in the diameter of the core wires, and meandering of the core wires with respect to the belt sleeve.

On the other hand, as in the present embodiment, the sheet material 23 is located on the outer peripheral side of the inner belt sleeve 21 so that adjacent portions of the sheet material 23 in the width direction W1 do not overlap each other in the radial direction of the core body 13. By being wound around the inner adhesive belt sleeve 22, it is possible to provide a method for manufacturing a hexagonal belt that can solve the problem when the core wire is used as the reinforcing member as in the conventional case.

Further, according to the present embodiment, the pitch P23 around which the sheet material 23 is wound around the inner adhesive belt sleeve 22 on the outer peripheral side of the inner belt sleeve 21 is set to be the same as the width W23 of the sheet material 23. According to this configuration, the sheet materials 23 adjacent to each other in the width direction W1 are wound around the inner adhesive belt sleeve 22 on the outer peripheral side of the inner belt sleeve 21 in a state where there is no gap in the width direction W1. As a result, even in the hexagonal belt 10 manufactured by the method for manufacturing the hexagonal belt 10 according to the present embodiment, the sheet materials 23 adjacent to each other in the width direction W1 of the hexagonal belt 10 have a gap in the width direction W1 of the hexagonal belt 10. It will be rolled up without it. Therefore, according to the hexagonal belt 10 manufactured by the method for manufacturing the hexagonal belt 10 according to the present embodiment, the space between both side surfaces of the hexagonal belt 10 is irrespective of the specifications (thickness of the core body, etc.) required for the hexagonal belt 10. The core body 13 can be arranged over the entire area. This eliminates the need to change the pitch P23 around which the core body 13 is wound around the inner adhesive belt sleeve 22 on the outer peripheral side of the inner belt sleeve 21 according to the specifications required for the hexagonal belt 10. As a result, it is possible to prevent mistakes such as improper pitch setting due to work mistakes when changing the pitch around which the core body 13 is wound around the inner adhesive belt sleeve 22. As a result, it is possible to reduce the labor required during manufacturing of the hexagonal belt 10 and reduce the occurrence of defective products.

For example, in the conventional case, that is, in the case of manufacturing a hexagonal belt in which the core wire is arranged between the inner rubber layer and the outer rubber layer, the pitch when the core wire is wound around the belt sleeve is set to the core wire. It is necessary to set according to the diameter of the rubber. For this reason, it takes time and effort to set the pitch, and there is a possibility that a mistake in setting the pitch may occur. On the other hand, as described above, according to the present embodiment, by making the width W23 of the sheet material 23 and the pitch P23 around which the sheet material 23 is wound the same, the width W23 of the sheet material 23 and the pitch at which the sheet material 23 is wound are made the same. P23 is uniquely determined. Therefore, both the trouble of setting the pitch P23 and the possibility that the setting error of the pitch P23 may occur can be reduced.

Further, according to the present embodiment, the core body 13 is formed by using the flat sheet material 23, and the width W23 of the sheet material 23 and the pitch P23 around which the sheet material 23 is wound are made the same, so that the width direction W1 It is possible to more reliably prevent one of the sheet materials 23 adjacent to the above from riding on the other. As a result, when the seat material 23 is ridden, it is possible to suppress the occurrence of the work of correcting the ridden portion to a position where the seat material 23 is not ridden. As a result, the labor required for manufacturing the hexagonal belt 10 can be reduced.

Further, for example, in the conventional case, that is, in the case of manufacturing a hexagonal belt in which the core wire is arranged between the inner rubber layer and the outer rubber layer, the pitch when winding the core wire around the inner belt sleeve is increased. It may be almost the same as the diameter of the core wire. In this case, although the pitch is set to be slightly larger than the diameter of the core wire, a phenomenon in which one of the core wires adjacent to each other in the width direction of the inner belt sleeve runs on the other is likely to occur. Such riding occurs due to an error in the position of the core wire when it is wound and a variation in the diameter of the core wire. Then, when the core wire is ridden, it is necessary to correct the ridden portion to a position where it is not ridden. On the other hand, as described above, according to the present embodiment, by making the width W23 of the sheet material 23 and the pitch P23 around which the sheet material 23 is wound the same, such riding can be suppressed.

Further, according to the present embodiment, the sheet material 23 can be held by the sheet material bobbin 2 in a state before the sheet material 23 is wound around the mantle 3 (see FIG. 8). As a result, by providing a sheet winding mechanism having a simple structure including a bobbin 2 for the sheet material and a mechanism for applying tension to the sheet material 23 after being fed out from the bobbin 2 for the sheet material, the sheet material is provided. It becomes possible to wind 23 around the mantle 3. This eliminates the need for a tension device having a complicated structure, which is required in a conventional structure, that is, a structure in which a core wire is wound around a belt sleeve.

For example, when the unvulcanized sleeve is formed by using the core wire instead of the sheet material 23, the core wire joint (the number of twisted fibers constituting the core wire) during the molding of the core wire used for forming the unvulcanized sleeve. It is necessary to take the trouble of providing a joint) whose position is shifted according to the above. On the other hand, according to the present embodiment, since the sheet material 23 is used instead of the core wire, the labor of the above-mentioned joint is not required, and as a result, the productivity of the hexagonal belt 10 can be further improved.

For example, when an unvulcanized sleeve is formed by using a core wire instead of the sheet material 23 and the unvulcanized sleeve is cut by a cutter, the processing conditions at the time of forming the core wire and the specifications of the cutter blade (round blade). Depending on whether or not the core wire is cut sharply, the core wire may not be cut sharply on the cut surface of the unvulcanized sleeve. In this case, the core wire is fluffed on the end face of the hexagonal belt, and as a result, it contributes to a decrease in the tensile strength of the hexagonal belt. However, according to the present embodiment, when the unvulcanized sleeve 26 is cut along the width direction W1 in the cutting step (step S6), the sheet material 23 has a sufficient length in the width direction W1. As a result, it is possible to prevent the sheet material 23 from being fluffed by the cutter. As a result, a decrease in the tensile strength of the hexagonal belt 10 can be suppressed more reliably.

Further, according to the present embodiment, since the core wire is not used for forming the hexagonal belt 10, no equipment for adhering the core wire to the unvulcanized sleeve is required. This makes it possible to bond the sheet material 23 to the adhesive belt sleeves 22 and 24 with the existing canvas processing equipment, and after this bonding treatment, the unvulcanized sleeve 26 can be cut to a specified width.

Further, according to the present embodiment, since the core wire is not used for forming the hexagonal belt 10, it is not necessary to move the heavy bobbin around which the core wire is wound or to set the core wire in the tension device. Therefore, the heavy work by the worker can be reduced.

Further, according to the present embodiment, since the core wire is not used for forming the hexagonal belt 10, the cores provided in the unvulcanized sleeves that are not used for the hexagonal belt (the beginning and the end of spinning). No need for wires. As a result, the amount of unnecessary waste to be cut off can be reduced in the cutting process. As a result, the yield of the material of the hexagonal belt 10 can be further increased.

In addition, when a core wire is used to form a hexagonal belt, separating the core wire and the rubber sleeve from the belt sleeve of the unvulcanized belt that has become cut waste is caused by the adhesive attached to the core wire. Have difficulty. Specifically, there are a plurality of core wires to be separated. Then, when the core wires are separated, the core wires are separated and fine core wire scraps remain on the belt sleeve, so that it takes a long time to separate all the core wire scraps. However, if the sheet material 23 is used to form the hexagonal belt 10, when the sheet material 23 is separated from a part of the unvulcanized sleeves 26 which have become desquamation, the sheet material 23 is attached to the adhesive belt sleeve 22. It is a work of peeling from 24. In such an operation, the sheet material 23 will be peeled off more evenly without being separated. Therefore, unlike the core wire, no debris remains, and the work of peeling off the sheet material 23 becomes easier.

The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be modified in various ways as long as it is described in the claims. For example, it may be changed as follows.

(1) For example, in the above-described embodiment, the sheet material 23 forming the core body 13 is 1 ply (1 layer). However, this does not have to be the case. FIG. 20 is a cross-sectional view of the hexagonal belt 10A according to the modified example. Further, FIG. 21 is a cross-sectional view showing a part of the unvulcanized sleeve 26A formed during the production of the hexagonal belt 10A according to the modified example. As in the hexagonal belt 10A shown in FIG. 20, the hexagonal belt 10A including the core 13A having a plurality of layers of the sheet material 23 may be implemented. Further, a method for manufacturing the hexagonal belt 10A for manufacturing the hexagonal belt 10A including the core body 13A having a plurality of layers of the sheet material 23 may be implemented. In the following, the points different from the above-described embodiment will be mainly described, and the same configurations as those in the above-described embodiment and the configurations corresponding to the above-described embodiments are designated by the same reference numerals in the drawings or described above. The description will be omitted by quoting the reference numerals in the description of the embodiment.

As shown in FIG. 21, when the hexagonal belt 10A according to the present modification is manufactured (that is, in the method for manufacturing the hexagonal belt 10A according to the present modification), the sheet material 23 is laminated in two layers. The core body 13A is formed. More specifically, in the core body forming step (step S3) in the above-described embodiment, the core body 13A is formed by laminating the sheet material 23 in the radial direction R1 of the inner belt sleeve 21. In the core body 13A, the sheet materials 23 adjacent to each other in the radial direction R1 preferably have winding directions opposite to each other in the width direction W1. That is, when the first layer sheet material 23 on the mantle 3 side is wound around the mantle 3 while moving the position before being wound around the mantle 3 toward one side of the axial direction X1 with respect to the mantle 3, two layers are used. It is preferable that the sheet material 23 of the eye is wound around the mantle 3 while moving the position before being wound around the mantle 3 toward the other side in the axial direction X1 with respect to the mantle 3.

In this modification, in the core body forming step (step S3), in any layer of the core body 13A, the sheet materials 23 adjacent to each other in the direction parallel to the axial direction X1 (that is, in the width direction W1 of the inner belt sleeve 21). The sheet material 23 is wound on the outer peripheral side of the inner belt sleeve 21 with respect to the mantle 3 so as to prevent the adjacent sheet materials 23 from overlapping each other in the radial direction R1 of the mantle 3 (the radial direction R1 of the inner belt sleeve 21). It is configured to be used. As a result, the core body 13A is formed.

Further, in this modification, the abutting positions B23 (B23a, B23b) of the edge 23a of the adjacent portions of the sheet material 23 in the width direction W1 are located between the sheet materials 23 adjacent to the radial direction R1 in the width direction W1. It is in a state of being shifted. Specifically, as shown in FIG. 21, the position B23a of the edge 23a in the first layer sheet material 23 (that is, the sheet material 23 in contact with the inner adhesive belt sleeve 22) and the second layer sheet material 23 (that is, the sheet material 23 in contact with the inner adhesive belt sleeve 22). That is, the position B23b of the edge 23a on the sheet material 23) in contact with the outer adhesive belt sleeve 24 is shifted in the width direction W1 within a range of dimensions smaller than the width W23 of the sheet material 23.

FIG. 20 is a cross-sectional view of the hexagonal belt 10A according to the present modification, and is a cross-sectional view in a cross section perpendicular to the circumferential direction C1. The hexagonal belt 10A of this modification is formed by using the unvulcanized sleeve 26A on which the core body 13A is formed as described above. Specifically, referring to FIG. 12, the unvulcanized sleeve 26A is subjected to the same cut step, skive step, cover winding step, and vulcanization step as in the above-described embodiment. A hexagonal belt 10A is formed.

The core body 13A of the hexagonal belt 10A according to the present modification has a sheet material 23 whose width is set to be larger than the thickness, as in the case of the core body 13 of the hexagonal belt 10 according to the above-described embodiment, and has an inner side. The width direction of the sheet material 23 provided between the rubber layer 11 and the outer rubber layer 12 is along the width direction W1 of the hexagonal belt 10A, and the thickness direction of the sheet material 23 is the thickness direction of the hexagonal belt 10A (radial direction R1). ) Is in line with. Further, in the core body 13A, the portions of the sheet material 23 adjacent to each other in the width direction W1 of the hexagonal belt 10A are not overlapped in the thickness direction of the hexagonal belt 10A.

The hexagonal belt 10A according to the present modification has a plurality of sheet materials 23 in which the core 13A is overlapped in the thickness direction of the hexagonal belt 10A. Further, in the hexagonal belt 10A, the end edges 23a of the portions of the sheet material 23 adjacent to each other in the width direction W1 of the hexagonal belt 10A are butted at a predetermined abutting position B23 (B23a, B23b) in the width direction W1 of the hexagonal belt 10A. It is in a state of being worn. Further, in the hexagonal belt 10A, the abutting positions B23a and B23b are displaced in the width direction W1 of the hexagonal belt 10A between the sheet materials 23 adjacent to the hexagonal belt 10A in the thickness direction (diameter direction R1).

The same effect as that of the above-described embodiment can be obtained by the above-described modification. That is, even according to the above modification, the hexagonal belt has a sufficient service life even under running conditions corresponding to the reduction of the diameter of the pulley and the shortening of the distance between the pulleys and the running condition under a high load. 10A can be provided. Further, it is possible to provide a method for manufacturing the hexagonal belt 10A, which can manufacture the hexagonal belt 10A.

Further, according to the above modification, the core body 13A is formed by laminating the sheet material 23 in the radial direction R1. By laminating the sheet materials 23 in this way (that is, by forming the core body 13A with a plurality of sheet materials 23 in a state of being stacked in the thickness direction of the hexagonal belt 10A), a core body having a desired thickness is used. 13A can be easily formed. As a result, it is not necessary to prepare a plurality of types of sheet materials having different thicknesses in advance according to the specifications of the hexagonal belt 10 (differences in the size, tensile strength, etc. of the hexagonal belt 10). As a result, the preparation, labor, and time required for manufacturing the hexagonal belt 10 can be reduced. Further, since it is not necessary to prepare a plurality of types of sheet materials, it is possible to use a wider space for the material storage in the manufacturing factory of the hexagonal belt 10. Further, since it is not necessary to replace different types of sheet materials, it is not necessary for the worker to frequently move the heavy bobbin around which the sheet material is wound, and the heavy work can be reduced.

In particular, by selecting the material, thickness, tensile strength of the sheet material 23 and the number of times (the number of layers) of the sheet material 23 being wound around the inner adhesive belt sleeve 22, the hexagonal belt 10 having desired physical properties can be easily formed. Can be done. As a result, it is not necessary to prepare a plurality of types of sheet materials having different thicknesses in advance according to the specifications of the hexagonal belt 10 (differences in the size, tensile strength, etc. of the hexagonal belt 10).

Further, according to the above modification, the abutting positions B23a and B23b are shifted in the width direction W1 between the sheet materials 23 adjacent to each other in the radial direction R1 (thickness direction of the hexagonal belt 10A). According to this configuration (that is, according to the configuration in which the abutting positions B23a and B23b are displaced in the width direction of the hexagonal belt 10A between the sheet materials 23 adjacent to each other in the thickness direction of the hexagonal belt 10A), the edges of the sheet material. The inner adhesive belt sleeve 22 has a more stable posture when the sheet material 23 is aligned with each other in the width direction of the hexagonal belt between the sheet materials adjacent to each other in the thickness direction of the hexagonal belt. Will be wrapped in. As a result, when the hexagonal belt 10 is used, each part of the core body 13A can receive tension more evenly. Therefore, the variation in the performance of the hexagonal belt 10 can be suppressed more reliably.

(2) In the above-described embodiments and modifications, examples of forming the belt sleeves 21, 22, 24, 25 with wide rubber sheets 31, 32 have been described. However, the present invention is not limited to this, and each belt sleeve 21, 22, 24, 25 may be formed by spirally winding a ribbon-shaped rubber having a width narrower than that of the rubber sheet around the mantle.

The present invention can be widely applied as a hexagonal belt and a method for manufacturing a hexagonal belt.

10,10A Hexagonal belt 11 Inner rubber layer 13,13A Core body 15 Outer rubber layer 23 Sheet material

Claims (9)

A hexagonal belt, which is an endless transmission belt with a hexagonal cross section.
An inner rubber layer provided as a radial inner portion of the hexagonal belt and having a trapezoidal cross section,
An outer rubber layer provided as a radial outer portion of the hexagonal belt and having a trapezoidal cross section,
The sheet material has a width set to be larger than the thickness, and the width direction of the sheet material provided between the inner rubber layer and the outer rubber layer is along the width direction of the hexagonal belt and the sheet. A core body in which the thickness direction of the material is along the thickness direction of the hexagonal belt, and
Equipped with a,
The hexagonal belt is characterized in that the core body has a plurality of the sheet materials in a state of being stacked in the thickness direction of the hexagonal belt. In the hexagonal belt according to claim 1,
The hexagonal belt is characterized in that, in the core body, adjacent portions of the sheet material in the width direction of the hexagonal belt do not overlap each other in the thickness direction of the hexagonal belt. In the hexagonal belt according to claim 1 or 2.
The edges of the sheet materials adjacent to each other in the width direction of the hexagon belt are abutted at a predetermined abutting position in the width direction of the hexagon belt.
A hexagonal belt, characterized in that the abutting position is deviated in the width direction of the hexagonal belt between the sheet materials adjacent to each other in the thickness direction of the hexagonal belt. In the hexagonal belt according to any one of claims 1 to 3.
The sheet material is characterized by containing a plurality of first fibers extending in a direction intersecting the circumferential direction of the hexagon belt and a plurality of second fibers extending in a direction intersecting the first fiber. Hexagon belt. A method for manufacturing a hexagonal belt, which is an endless transmission belt having a hexagonal cross section.
An inner belt sleeve forming step for forming an endless unvulcanized inner belt sleeve which is a base of an inner rubber layer which is a rubber layer on the inner peripheral side of the hexagonal belt.
A core body forming step in which a core body is formed by winding a sheet material around the outer peripheral side of the inner belt sleeve formed in the inner belt sleeve forming step.
An outer belt sleeve forming step of forming an endless unvulcanized outer belt sleeve that is a base of an outer rubber layer that is a rubber layer on the outer peripheral side of the hexagonal belt on the outer peripheral side of the core body.
Including
The width of the sheet material is set to be larger than the thickness of the sheet material .
A method for manufacturing a hexagonal belt, which comprises forming the core body by laminating the sheet material in the radial direction of the inner belt sleeve in the core body forming step. The method for manufacturing a hexagonal belt according to claim 5.
In the core body forming step, the sheet material is formed on the outer periphery of the inner belt sleeve so that adjacent portions of the sheet material in the width direction of the inner belt sleeve do not overlap each other in the radial direction of the inner belt sleeve. A method for manufacturing a hexagonal belt, which is characterized by being wound on the side. The method for manufacturing a hexagonal belt according to claim 6.
In the core body forming step, the core body is formed by spirally winding the sheet material.
A method for manufacturing a hexagonal belt, characterized in that the pitch at which the sheet material is wound around the outer peripheral side of the inner belt sleeve is set to be the same as the width of the sheet material. The method for manufacturing a hexagonal belt according to any one of claims 5 to 7.
The edges of the sheet materials adjacent to each other in the width direction of the inner belt sleeve are abutted at a predetermined abutting position in the width direction of the inner belt sleeve.
A method for manufacturing a hexagonal belt, characterized in that the abutting position is shifted in the width direction between the sheet materials adjacent to each other in the radial direction. The method for manufacturing a hexagonal belt according to any one of claims 5 to 8.
The sheet material includes a plurality of first fibers extending in a direction intersecting the circumferential direction of the inner belt sleeve in a state where the sheet material is wound around the outer peripheral side of the inner belt sleeve, and intersects the first fibers. A method for manufacturing a hexagonal belt, which comprises a plurality of second fibers extending in a direction.

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