JP2009119846A - Vulcanizing method of belt sleeve for manufacturing driving belt, and manufacturing method of driving belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vulcanizing method of a belt sleeve for manufacturing a driving belt which can vulcanize the belt sleeve without generating remaining air and can manufacture the driving belt improved in belt life. <P>SOLUTION: An unvulcanized belt sleeve 4 composed of at least a core wire 2 and a rubber sheet 3 is wound around the outer circumference surface of a mold 1. The belt sleeve 4 installed in this mold 1 is pressed, heated and compressed to be molded. Thereafter, the belt sleeve 4 is pressed, and heated in this vulcanizing process, thereby vulcanizing the belt sleeve 4. The unvulcanized belt sleeve 4 is compressed to squeeze out air existing between the core wires 2 and between the core wire 2 and the rubber sheet 3, thereby removing the air in the belt sleeve 4. Thus it is possible to vulcanize the belt sleeve 4 in a state that no air remains. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vulcanization method for a belt sleeve used for manufacturing a transmission belt, and also relates to a transmission belt manufacturing method using this vulcanization method.

  As an example of manufacturing a transmission belt, an unvulcanized belt sleeve is produced by winding a core wire and a rubber sheet around the outer periphery of a cylindrical mold, and this belt sleeve is heated and pressurized to vulcanize, and then vulcanized. There is a method of obtaining a power transmission belt by removing the belt sleeve from the mold and cutting the vulcanized belt sleeve so as to cut it into a ring. As a method for vulcanizing the unvulcanized belt sleeve wound around the outer periphery of the mold in this way, various methods such as Patent Document 1 have been proposed.

  FIG. 21 shows a vulcanization method of the belt sleeve proposed in Patent Document 1, and an unvulcanized belt sleeve 4 is mounted on the outer periphery of the mold 11 as shown in FIG. Reference numeral 12 denotes an outer mold, and an expandable / shrinkable jacket 13 is attached to the inner periphery of the outer mold. A sealed space 14 is formed between the outer mold 12 and the jacket 13. The space portion 14 is provided with an inlet / outlet port 15. Reference numeral 16 denotes a heated steam introducing cylinder, and 17 is a packing.

Then, the pressure medium in the space portion 14 is discharged from the inlet / outlet port 15 and the jacket 11 is elastically deformed so as to widen the inner diameter thereof as shown in FIG. Is inserted into the inner periphery of the jacket 13 of the outer mold 12 and set, and then the heating steam is supplied from the heating steam introducing cylinder 16 to the inside of the mold 11 to heat the space 14 from the inlet / outlet 15. The jacket 13 is expanded inward by injecting a pressure fluid therein, and the belt sleeve 4 is pressed by pressing the outer periphery of the belt sleeve 4 with the inner peripheral surface of the jacket 13 as shown in FIG. It can be vulcanized. In FIG. 21, reference numeral 18 denotes a size adjusting sleeve mounted inside the jacket 13 in order to adjust the size between the outer periphery of the belt sleeve 4 and the inner periphery of the jacket 13.
Japanese Patent Laid-Open No. 11-156857

  As described above, the jacket 13 provided on the inner periphery of the outer mold 12 is expanded inward, whereby the belt sleeve 4 can be vulcanized by pressurizing the unvulcanized belt sleeve 4 with the jacket 13. However, the belt sleeve 4 may not be pressurized with sufficient pressure by the expansion force of the jacket 13. If vulcanization is performed in such a state that the pressure of the pressurization is not sufficient, the air existing between the core wires or between the core wire and the rubber sheet is not sufficiently extruded in the belt sleeve 4, and the belt sleeve 4. Vulcanization is performed with air remaining inside, and there is a problem that residual air may be generated in the vulcanized belt sleeve 4. In particular, the upper and lower end portions of the belt sleeve 4 are less likely to be pressurized by the jacket 13, so that a large amount of residual air is likely to be generated. If there is residual air in the belt sleeve 4 thus vulcanized, the belt life of the transmission belt obtained by cutting the vulcanized belt sleeve 4 is shortened by the residual air.

  Further, as the rubber of the belt sleeve 4, ethylene / α-olefin elastomer having excellent characteristics in ozone resistance, heat resistance, cold resistance and the like may be used. Due to the chipping, delamination is likely to occur in the belt sleeve 4, and there is also a problem that the belt life may be shortened by delamination.

  Further, when manufacturing a rib belt in which ribs are provided along the belt direction as a transmission belt, the ribs are formed between the V grooves by polishing the V grooves on the outer periphery of the vulcanized belt sleeve 4. However, in this case, a large amount of rubber scrap is generated by polishing, resulting in a large material loss. For this reason, as shown in FIG. 22A, a molding convex portion 41 having the same shape as the V groove 8 is provided on the inner periphery of the molding die 6 for vulcanizing the unvulcanized belt sleeve 4. At the same time as vulcanizing, the V-groove 8 is formed in the belt sleeve 4 to form the V-groove 8 in the belt sleeve 4 without the need for polishing, and the rib 9 is formed between the V-grooves 8. Has been.

  However, in this case, the short fiber 42 for reinforcement is blended in the rubber of the belt sleeve 4. When the short fiber 42 is formed into the V groove 8 as shown in FIG. 8, the amount of the short fibers 42 oriented in the width direction of the rib 9 is reduced, the rigidity in the width direction of the rib 9 is lowered, and the belt life may be shortened. There was a problem that there was.

  Further, in the ribbed belt manufactured as shown in FIG. 22, since the rib 9 is formed with the rubber exposed on the surface, the coefficient of friction with respect to the pulley is high, and therefore when the belt is run. There was a problem that abnormal noise was likely to occur.

  The present invention has been made in view of the above points, and is capable of vulcanizing a belt sleeve without generating residual air and with improved interlayer adhesion, thereby improving the belt life. An object of the present invention is to provide a belt sleeve vulcanizing method for producing a transmission belt capable of producing a belt, further reducing the material loss due to polishing and improving the belt life. It is an object of the present invention to provide a method of manufacturing a transmission belt capable of manufacturing the transmission belt. In addition, an object of the present invention is to provide a transmission belt manufacturing method capable of manufacturing a transmission belt that reduces the occurrence of abnormal noise during belt running.

  The method of vulcanizing a belt sleeve for producing a transmission belt according to claim 1 of the present invention is configured by winding and mounting an unvulcanized belt sleeve 4 comprising at least a core wire 2 and a rubber sheet 3 around the outer peripheral surface of a mold 1; After the belt sleeve 4 attached to the mold 1 is pressed and heated to be compressed, the belt sleeve 4 is vulcanized by pressurizing and heating the belt sleeve 4 in the vulcanization process. It is a feature.

  According to the present invention, the unvulcanized belt sleeve 4 is molded to compress the air existing between the core wires 2 or between the core wires 2 and the rubber sheet 3 in the belt sleeve 4 and thereby air. The belt sleeve 4 can be vulcanized with no air remaining, and the belt sleeve 4 can be vulcanized without generating residual air.

  The belt sleeve vulcanizing method for manufacturing a transmission belt according to claim 2 of the present invention is the unvulcanized method comprising at least the core wire 2 and the rubber sheet 3 on the outer periphery of the bladder 5 of the mold 1 provided with the bladder 5 on the outer periphery. After the belt sleeve 4 of vulcanization is wound and mounted, the belt sleeve 4 is heated and compressed while being pressurized from the outer peripheral side, and then the mold 1 with the belt sleeve 4 is placed in the vulcanization mold 6 The belt sleeve 4 is vulcanized by inflating the bladder 5 of the mold 1 and pressing the belt sleeve 4 against the inner periphery of the vulcanization mold 6 while heating the vulcanization mold 6. It is a feature.

  According to the present invention, the belt sleeve 4 mounted on the outer periphery of the bladder 5 of the mold 1 is heated and compressed while being pressurized from the outer peripheral side, whereby the core sleeve 2 and the core wire 2 The air existing between the rubber sheets 3 can be expelled to release air, and then the bladder 5 is expanded and the belt sleeve 4 is pressed against the inner periphery of the vulcanizing mold 6 to pressurize the air. The belt sleeve 4 can be vulcanized without remaining, and the belt sleeve 4 can be vulcanized without generating residual air. Further, by compressing the belt sleeve 4 in this way, the thickness of the belt sleeve 4 can be reduced. The mold 1 is placed in the vulcanizing mold 6 and the bladder 5 is inflated. Can be reduced when the belt sleeve 4 is pressed against the inner periphery of the vulcanizing mold 6 to expand the diameter of the belt sleeve 4, and the elongation of the core wire 2 due to the expansion deformation of the belt sleeve 4 can be reduced. It is something that can be done.

  The invention according to claim 3 is characterized in that the rubber sheet 3 according to claim 1 or 2 is made of an ethylene / α-olefin elastomer made of rubber.

  According to the present invention, the rubber layer is formed by heating and pressurizing and compressing the unvulcanized belt sleeve 4 to heat the ethylene / α-olefin elastomer having low inherent adhesiveness to increase the adhesiveness. The belt sleeve 4 can be vulcanized in a state where the rubber layers and the cores can be pressed and brought into close contact with each other, and the interlayer adhesion is improved.

  According to a fourth aspect of the present invention, there is provided a transmission belt manufacturing method comprising an unvulcanized belt sleeve 4 comprising at least a cord 2 and a rubber sheet 3 on the outer periphery of a bladder 5 of a mold 1 provided with a bladder 5 on the outer periphery. After the belt sleeve 4 is pressed from the outer peripheral side and heated and compressed, the mold 1 equipped with the belt sleeve 4 is placed in the vulcanizing mold 6 and the vulcanizing mold is mounted. While heating 6, the bladder 5 of the mold 1 is expanded and the belt sleeve 4 is pressed against the inner periphery of the vulcanizing mold 6 to pressurize the groove forming recess 7 on the outer periphery of the belt sleeve 4. The belt sleeve 4 is vulcanized while the groove 8 deeper than the groove forming recess 7 is polished at the groove forming recess 7 of the vulcanized belt sleeve 4 to form ribs 9 between the grooves 8. It is characterized by.

  According to the present invention, when the belt sleeve 4 is vulcanized, the groove forming recess 7 shallower than the groove 8 is formed in the belt sleeve 4, and the belt sleeve 4 is polished so as to dig deeper into the groove forming recess 7. Thus, the groove 8 for forming the rib 9 can be produced, and the volume of the groove forming recess 7 can be reduced, and the amount of polishing of the belt sleeve 4 can be reduced. Even when the short fiber is oriented along the surface of the groove forming concave portion 7 when the groove forming concave portion 7 is formed, the portion where the short fiber is oriented is used when the groove 8 is polished. This is a portion that is removed by the above, and the amount of short fibers oriented in the width direction of the rib 9 can be secured.

  According to a fifth aspect of the present invention, there is provided a transmission belt manufacturing method comprising an unvulcanized article comprising at least a core wire 2 and a rubber sheet 3 on the outer periphery of a bladder 5 of a mold 1 provided with a bladder 5 which can expand and contract on the outer periphery. The belt sleeve 4 is wound and mounted, and the short fiber 10 is planted on the outer peripheral surface of the belt sleeve 4, and the belt sleeve 4 in which the short fiber 10 has been planted is heated and compressed from the outer peripheral side while being compressed. Then, the mold 1 equipped with the belt sleeve 4 is placed in the vulcanizing mold 6 and the bladder 5 of the mold 1 is expanded while the vulcanizing mold 6 is heated to vulcanize the belt sleeve 4. By pressing and pressing the inner periphery of the mold 6, the belt sleeve 4 is vulcanized while forming the grooves 8 on the outer periphery of the belt sleeve 4, and ribs 9 are formed between the grooves 8. is there.

  According to the present invention, it is possible to manufacture a transmission belt in which the surface of the rib 9 is covered with the short fibers 10 that are flocked, and the friction coefficient of the rib 9 against the pulley is reduced with the short fibers 10 that cover the surface. Therefore, it is possible to reduce the occurrence of abnormal noise during belt running.

  The invention according to claim 6 is characterized in that the rubber sheet 3 of claim 4 or claim 5 is made of an ethylene / α-olefin elastomer made of rubber.

  According to the present invention, the rubber layer is formed by heating and pressurizing and compressing the unvulcanized belt sleeve 4 to heat the ethylene / α-olefin elastomer having low inherent adhesiveness to increase the adhesiveness. The belt sleeve 4 can be vulcanized in a state where the adhesion between the rubber layers and the rubber layer and the core wire can be increased by pressurization, and the interlayer adhesion is improved, and a transmission belt with improved belt life is obtained. It is something that can be done.

  According to the present invention, prior to vulcanization, the unvulcanized belt sleeve 4 is molded by heating and pressurizing and compressing, thereby existing between the core wires 2 or between the core wires 2 and the rubber sheet 3. The belt sleeve 4 can be evacuated from the inside of the belt sleeve 4 and the belt sleeve 4 can be vulcanized with no air remaining. When an elastomer is used, the belt sleeve 4 can be vulcanized in a state where the interlayer adhesion is enhanced, and a vulcanized belt sleeve 4 having no residual air and having high interlayer adhesion can be obtained. Thus, a transmission belt having an improved belt life can be manufactured. Further, by compressing the belt sleeve 4 prior to vulcanization, the thickness of the belt sleeve 4 can be reduced, and the bladder 5 is inflated to press the belt sleeve 4 against the inner periphery of the vulcanizing mold 6 and apply pressure. When the belt is vulcanized, the belt sleeve 4 can be reduced in diameter and the elongation of the core wire 2 can be reduced, and a transmission belt having a small outer peripheral length can be manufactured. It is.

  Further, according to the present invention, when the belt sleeve 4 is vulcanized, the groove forming recess 7 shallower than the groove 8 is formed in the belt sleeve 4, thereby polishing the belt sleeve 4 by the volume of the groove forming recess 7. The groove 8 can be produced by reducing the amount to be produced, and the material loss due to polishing can be reduced, and the short fiber is formed along the surface of the groove forming recess 7 when the groove forming recess 7 is formed. Even if it is oriented, the portion where the short fibers are oriented is the portion removed when the groove 8 is polished, and the amount of short fibers oriented in the width direction of the rib 9 is ensured to improve the belt life. A transmission belt can be manufactured.

  Furthermore, according to the present invention, by transmitting the short fibers 10 on the outer peripheral surface of the belt sleeve 4, a transmission belt in which the surfaces of the ribs 9 are coated with the short fibers 10 can be manufactured. The coefficient can be reduced to reduce the occurrence of abnormal noise during belt running.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 shows an example of a mold 1 used as an inner mold in the present invention. The mold 1 is formed in a columnar shape or a cylindrical shape, and flanges 22a and 22b are provided on both upper and lower end surfaces so as to protrude from the outer periphery. On the outer periphery of the mold 1, there is provided a bladder 5 formed in a cylindrical shape with a material that is stretchable and airtight such as rubber. The bladder 5 is attached by attaching the entire circumference of both ends of the opening to the flanges 22a and 22b so that the space between the outer periphery of the mold 1 and the inner periphery of the bladder 5 is sealed at both the upper and lower ends. is there. Further, the mold 1 is provided with a fluid supply path 23 whose upper end protrudes upward from the upper flange 22 a and whose lower end passes through the mold 1 and opens on the outer peripheral surface of the mold 1 inside the bladder 5. The fluid such as air can be supplied between the outer periphery of the mold 1 and the inner periphery of the bladder 5 through the fluid supply path 23. When the fluid is supplied through the fluid supply path 23 in this way, since the space between the outer periphery of the mold 1 and the inner periphery of the bladder 5 is sealed at both the upper and lower ends, the bladder 5 swells outward as the fluid flows in. It is designed to be inflated. When the fluid is not supplied from the fluid supply path 23 as described above, the bladder 5 is in close contact with the outer periphery of the mold 1.

  In this way, the belt sleeve 4 is formed using the mold 1 having the bladder 5 on the outer periphery as the inner mold. First, the unvulcanized belt sleeve 4 is wound around the outer periphery of the bladder 5 of the mold 1 and attached. To do. As shown in FIG. 2, the belt sleeve 4 is formed as a laminated body of a core wire 2 wound spirally around the outer periphery of the bladder 5 and an unvulcanized rubber sheet 3 wound around the outer periphery of the bladder 5. In the embodiment of FIG. 2, the rubber sheet 3 (3a) for forming the back rubber layer, the core wire 2, and the rubber sheet 3 (3b) for forming the compression rubber layer are wound around the outer periphery of the bladder 5 in this order from the inside. Although the belt sleeve 4 is formed in the configuration, a rubber sheet for forming an adhesive rubber layer may be provided between the rubber sheets 3a and 3b, and it goes without saying that the present invention is not limited to the above layer configuration. Absent.

  Next, the mold 1 having the unvulcanized belt sleeve 4 mounted thereon is set in the forming device 25. As shown in FIG. 3, the forming device 25 is formed in a bottomed cylindrical shape whose upper surface is open. A ring-shaped flange 27 is provided on the upper end of the outer shell 26 whose upper surface is open. It is formed by providing a pressurizing cylinder 28 formed of a cylindrical elastic rubber or the like inside the side wall 26a. The pressurizing cylinder 28 is attached with the entire periphery of the upper end opening being in close contact with the lower surface of the flange 27 and the entire periphery of the lower end opening is attached in close contact with the bottom surface of the outer shell 26. A sealed annular space 29 is formed between the pressure cylinders 28. An air supply path 30 is connected to the side wall 26 a of the outer shell 26 so that air can be supplied from the air supply path 30 into the sealed space 29. An annular steam can 31 is disposed in the sealed space 29, and a steam supply path 32 connected to the steam can 31 is led out through the side wall 26 a of the outer shell 26.

  Then, after the mold 1 fitted with the unvulcanized belt sleeve 4 is set in the forming device 25 as shown in FIG. 3 through the opening on the upper surface, heated steam is supplied from the steam supply path 32 to the steam can 31. By heating the inside of the sealed space 29 and supplying high-pressure air from the air supply path 30 into the sealed space 29, the pressurizing cylinder 28 is inflated inward. By inflating the pressurizing cylinder 28 in this way, as shown in FIG. 4, the pressurizing cylinder 28 is pressed against the outer periphery of the unvulcanized belt sleeve 4 attached to the mold 1, and the belt The sleeve 4 can be pressurized from the outer peripheral side. At this time, since the inside of the sealed space 29 is heated by the steam can 31, the belt sleeve 4 can be pressurized by the pressure cylinder 28 while being heated by the heat transmitted through the pressure cylinder 28. The molding by heating and pressurization is performed at a temperature of about 100 to 120 ° C. and a pressure of about 0.5 to 1.5 MPa under conditions that do not vulcanize the belt sleeve 4 for about 2 to 10 minutes. Thus, by heating and pressurizing the unvulcanized belt sleeve 4 from the outside, the belt sleeve 4 is compressed and the air existing between the core wire 2 or between the core wire 2 and the rubber sheet 3 is expelled. The air can be removed from the belt sleeve 4.

  Here, as the rubber sheet 3 of the belt sleeve 4, a rubber material made of ethylene / α-olefin elastomer is being used. This ethylene / α-olefin elastomer has excellent properties in ozone resistance, heat resistance, cold resistance and the like, and also satisfies the recent demand for dehalogenation, and is therefore suitable as a material for a transmission belt. . This ethylene / α-olefin elastomer is a copolymer of ethylene and an α-olefin such as propylene, butene, hexene, octene, or a copolymer of ethylene, α-olefin and a non-conjugated diene. Can include non-conjugated dienes having 5 to 15 carbon atoms such as ethylidene norbornene, dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, ethylene norbornene and the like. Specific examples of such ethylene / α-olefin elastomers include ethylene-propylene rubber (EPM) and ethylene-propylene-diene copolymer (EPDM), among which EPDM is often used. .

  However, since this ethylene / α-olefin elastomer inherently lacks adhesiveness, interlayer adhesion of the belt sleeve 4, for example, between the rubber sheet 3 a for forming the back rubber layer and the rubber sheet 3 b for forming the compression rubber layer, Interlaminar adhesion is insufficient between the rubber sheet 3b for forming the compressed rubber layer and the core wire 2, and delamination is likely to occur in the belt sleeve 4.

  On the other hand, in the present invention, the unvulcanized belt sleeve 4 attached to the mold 1 as described above is set in the forming device 25, and the belt sleeve 4 is compressed while being heated from the outer peripheral side. Therefore, in the state where the adhesive strength of the ethylene / α-olefin elastomer is increased by heating, the layers in the belt sleeve 4 can be brought into close contact with each other by high pressure, and the interlayer adhesion is high. The belt sleeve 4 can be obtained. When the rubber of the belt sleeve 4 is formed of ethylene / α-olefin elastomer, compression by heating / pressing is performed at a temperature of about 120 to 170 ° C., a pressure of about 0.5 to 1.5 MPa, and 2 to 10 minutes. It is preferable to carry out under the condition that the belt sleeve 4 is not vulcanized.

  In the forming apparatus 25 of FIG. 3, the pressurization is performed by the pressurizing cylinder 28 and the heating is performed by the steam can 31, but the high-temperature high-pressure air preheated by the hot air generator is sealed from the air supply path 30. The pressure sleeve 28 may be inflated with the high-temperature and high-pressure air to inflate the belt sleeve 4 by supplying it into the air 29, and the belt sleeve 4 may be heated through the pressure tube 28. At this time, high-temperature and high-pressure air is always supplied from the air supply path 30 while exhausting the air in the sealed space 29 little by little, and the heating temperature of the belt sleeve 4 through the pressure cylinder 28 is constant. It is supposed to be kept.

By compressing the unvulcanized belt sleeve 4 attached to the mold 1 by heating and pressurizing in the forming device 25 as described above, the thickness T ₁ before compression is changed to the thickness T ₂ after compression. The thickness of the sleeve 4 is reduced (T ₁ > T ₂ ). Then, after the molding for compressing the belt sleeve 4 is completed, the supply of air to the sealed space 29 is stopped, the pressure cylinder 28 is contracted to the original state, and the unvulcanized belt sleeve 4 as shown in FIG. The mold 1 equipped with is taken out from the forming device 25.

  Next, in the vulcanization step, the belt sleeve 4 is vulcanized using the vulcanization mold 6 as an outer mold. FIG. 6 shows the vulcanizing mold 6, which is formed in a cylindrical shape having an open top surface, and the inside of the side wall 6 a of the vulcanizing mold 6 is sealed and sealed around the entire circumference, and is heated and cooled. A jacket 35 is formed. The heating / cooling jacket 35 is connected to a heating medium supply path 36 for supplying a heating medium such as steam and a refrigerant supply path 37 for supplying a cooling medium such as cooling water. It can be cooled.

  Then, the mold 1 equipped with the unvulcanized belt sleeve 4 compression molded as described above is inserted into the vulcanizing mold 6 through the opening on the upper surface and set as shown in FIG. Next, while heating the vulcanization mold 6 by supplying a heating medium from the heat medium supply path 36 to the heating / cooling jacket 35, fluid such as air is passed through the fluid supply path 23 to the outer periphery of the mold 1 and the bladder 5. By supplying between the circumferences, the bladder 5 is inflated so as to inflate outwardly by air pressure as shown in FIG. When the bladder 5 expands outward as described above, the belt sleeve 4 wound around the outer periphery of the bladder 5 is pressed against the inner peripheral surface of the vulcanizing mold 6 and the belt sleeve 4 is pressurized from the inside. The belt sleeve 4 can be vulcanized by pressurizing the belt sleeve 4 between the expanded bladder 5 and the vulcanizing mold 6 while being heated by the heating / cooling jacket 35 in this manner. The vulcanization molding by heating and pressurization is preferably performed at a temperature of about 120 to 170 ° C. and a pressure of about 0.5 to 1.5 MPa under conditions of about 15 to 30 minutes.

  After the vulcanization is performed in this manner, the supply of the fluid from the fluid supply path 23 is stopped, so that the bladder 5 is contracted and returned to the original state, and the refrigerant is supplied from the refrigerant supply path 37 to the heating / cooling jacket 35. Is supplied to cool the vulcanization mold 6. When the bladder 5 is contracted to the original state as described above, the outer diameter of the bladder 5 becomes smaller and becomes smaller than the inner diameter of the vulcanized belt sleeve 4A. Therefore, as shown in FIG. The mold 1 can be extracted while leaving the sleeve 4 </ b> A on the inner periphery of the vulcanization mold 6.

  Then, after the temperature of the belt sleeve 4A vulcanized by the vulcanizing mold 6 being cooled is lowered to a temperature capable of demolding, the vulcanized belt sleeve 4A is taken out from the vulcanizing mold 6 as shown in FIG. It is something that can be done.

  Here, as described above, the unvulcanized belt sleeve 4 is exhausted by compression by heating and pressurizing, so that no air remains, so that sufficient pressure is applied during vulcanization molding. Even if it is not high, residual air is not generated in the belt sleeve 4A obtained by vulcanization. Similarly, the unvulcanized belt sleeve 4 has improved interlayer adhesion by compression by heating and pressurization, and the belt sleeve 4A obtained by vulcanization has high interlayer adhesion. Then, the vulcanized belt sleeve 4A is cut so as to be cut in a circle to produce a transmission belt such as a V-belt, whereby a transmission belt having no residual air can be obtained, and transmission with high interlayer adhesion. A belt can be obtained, and the belt life of the transmission belt can be improved.

Further, as described above, by compressing the unvulcanized belt sleeve 4 attached to the mold 1 heated and pressurized, the thickness of the belt sleeve 4, the thickness after the compression from the thickness T ₁ of the uncompressed It has become as thin as to T _2. In order to vulcanize the belt sleeve 4, when the mold 1 with the belt sleeve 4 is inserted into the vulcanizing mold 6 as shown in FIG. Necessary between the inner periphery of the mold 6. Accordingly, when the belt sleeve 4 is vulcanized by inflating the bladder 5 as shown in FIG. 7 and pressing the belt sleeve 4 attached to the bladder 5 against the inner peripheral surface of the vulcanizing mold 6, the dimension of the clearance C is measured. Accordingly, the belt sleeve 4 is pressed against the inner peripheral surface of the vulcanizing mold 6 while being expanded by the bladder 5 so that the diameter of the belt sleeve 4 increases. When the diameter of the belt sleeve 4 is increased in this way, the core wire 2 provided in the circumferential direction on the belt sleeve 4 is expanded accordingly.

At this time, the belt sleeve 4 mounted on the bladder 5 and those that remain with a thickness T ₁ without compression as described above, the inner periphery of the belt sleeve 4 by the expansion of the bladder 5 vulcanised 6 since the thickness belt sleeve 4 by pressing is compressed is thinner than T _1, the dimension of the sum of the partial dimension size of the clearance C and the thickness decreases, the belt sleeve 4 is larger in diameter diameter Thus, when the diameter of the belt sleeve 4 is greatly increased, the extension of the core wire 2 is also increased. If the belt outer peripheral length is long as a transmission belt, even if the extension of the core wire 2 is slightly increased, the overall expansion rate is not so large and does not particularly affect the molding. If the length is reduced to about 1000 mm or less, the stretch rate of the core 2 as a whole cannot be ignored, which may affect the molding.

In the present invention, on the other hand, to compress the belt sleeve 4 as described above, pressurizing the belt sleeve 4 thickness is as thin as the thickness T ₂ of the compressed from a thickness T ₁ of the previous compressed vulcanization mold within 6 since so as to vulcanization, be pressed against the inner periphery of the belt sleeve 4 vulcanised 6 the expansion of the bladder 5, it is hardly thickness of the belt sleeve 4 is thinner than T _2, the clearance C The diameter of the belt sleeve 4 is hardly increased beyond the dimension. Accordingly, the extension of the core wire 2 does not increase, and even if the belt outer peripheral length is short as a power transmission belt, the extension rate of the core wire 2 does not increase so much, and it particularly affects the molding. Accordingly, it is possible to form a small-sized transmission belt having a belt outer peripheral length of about 1000 mm or less.

  Next, a method for manufacturing a rib belt as a transmission belt will be described. Until the unvulcanized belt sleeve 4 is attached to the outer periphery of the mold 1 and the belt sleeve 4 is heated and pressurized by the forming device 25 and compressed and molded and then taken out, it is the same as in the steps of FIGS. Can be done.

  In the present embodiment, when the belt sleeve 4 is vulcanized by the vulcanization mold 6 after the step of FIG. 5, the vulcanization mold 6 is molded as shown in FIG. A surface provided with a molding convex portion 45 on the inner peripheral surface serving as a surface is used. The molding convex part 45 is provided so as to extend over the entire inner circumference of the vulcanization mold 6, and is parallel to the circumferential direction of the inner circumference of the vulcanization mold 6 at a predetermined constant interval. Many are provided. The molding convex portion 45 is formed to be slightly smaller than the molding convex portion 41 provided in FIG. 22A described above for molding the rib 9 on the rib belt. is there. The other structure of the vulcanization mold 6 is the same as that of FIG.

  Then, the mold 1 equipped with the compression-molded unvulcanized belt sleeve 4 is set in the vulcanizing mold 6 as shown in FIG. 10, and the vulcanizing mold 6 is heated by the heating / cooling jacket 35 while supplying the fluid. A fluid such as air is supplied from the passage 23 between the outer periphery of the mold 1 and the inner periphery of the bladder 5, and the bladder 5 is expanded outwardly by air pressure as shown in FIG. The belt sleeve 4 wound around the belt is pressed against the inner peripheral surface of the vulcanizing mold 6, and the belt sleeve 4 can be heated and pressurized between the bladder 5 and the vulcanizing mold 6. It can be sulfurized. This vulcanization molding by heating and pressurization can be performed under the same conditions as described above. Further, by pressing the belt sleeve 4 against the inner peripheral surface of the vulcanizing mold 6 in this way, the groove forming concave portion 7 is formed on the outer periphery of the belt sleeve 4 by the molding convex portion 45 of the vulcanizing mold 6. It is something that can be done.

  After vulcanization in this manner, the bladder 5 is contracted and returned to the original state in the same manner as in the step of FIG. When the bladder 5 is contracted to the original state as described above, the outer diameter of the bladder 5 becomes smaller and becomes smaller than the inner diameter of the vulcanized belt sleeve 4A. Therefore, as shown in FIG. The mold 1 can be extracted while leaving the sleeve 4 </ b> A on the inner periphery of the vulcanization mold 6. Then, after the temperature of the belt sleeve 4A vulcanized by the cooled vulcanizing mold 6 is lowered to a temperature at which demolding is possible, the vulcanized belt sleeve 4A is taken out from the vulcanizing mold 6 as shown in FIG. It is something that can be done.

  On the outer periphery of the vulcanized belt sleeve 4A obtained in this way, the groove forming recess 7 is formed by the forming protrusion 45 of the vulcanizing die 6 as described above, and this groove forming recess. As shown in FIG. 14A, 7 is formed as a recess smaller than the groove 8 formed in the rib belt. The depth of the groove forming recess 7 is preferably about 40 to 70% of the depth of the groove 8 formed in the rib belt. Then, the surface of the belt sleeve 4A is polished with a polishing apparatus or the like into a V-shaped cross section along the outer periphery, thereby producing grooves 8 as shown in FIG. 14B, and ribs are formed between the grooves 8 thus produced. 9 can be formed. The groove 8 is polished by digging the groove forming recess 7 in the groove forming recess 7 formed in the belt sleeve 4A. Accordingly, when the groove 8 is formed by polishing the belt sleeve 4A, it is not necessary to polish the groove forming concave portion 7, so the amount of polishing is reduced by the volume of the groove forming concave portion 7, and material loss due to polishing is reduced. It can be reduced. In order to reduce material loss due to polishing, it is preferable to set the depth of the groove forming recess 7 to be less than 70% of the depth of the groove 8 of the rib belt as described above.

  Then, by cutting the vulcanized belt sleeve 4A in which the grooves 8 are polished and formed with the ribs 9 in this way, a rib belt having a plurality of ribs 9 in the belt direction in the compressed rubber layer is obtained. It is something that can be done.

  Here, the rubber of the belt sleeve 4 contains reinforcing short fibers 42, and even if the short fibers 42 are oriented in the width direction of the belt sleeve 4, the belt sleeve 4 is vulcanized as described above. When the groove forming recess 7 is formed by the inner peripheral forming protrusion 41, the short fibers 42 contained in the vicinity of the groove forming recess 7 are formed as shown in FIG. It will be oriented along the inner surface of the recess 7 for use. However, the portion in which the short fibers 42 are oriented so as to be along the inner surface of the groove forming recess 7 is a portion that is polished when the groove 8 is manufactured, and is oriented so as to be along the inner surface of the groove forming recess 7. The short fibers 42 are removed by polishing the grooves 8, and the short fibers 42 contained in the ribs 9 formed by polishing the grooves 8, as shown in FIG. Many are oriented in the direction. For this reason, the rigidity of the rib 9 in the width direction is increased, and the belt life can be improved. In order to suppress the orientation of the short fibers 42 due to the formation of the groove forming recess 7, the depth of the groove forming recess 7 is preferably set to 40% or more of the depth of the groove 8 of the rib belt as described above. It is.

  Further, when the groove 8 is polished from above the groove forming recess 7, the short fibers 42 contained in the vicinity of the groove forming recess 7 are oriented along the inner surface of the groove forming recess 7 as described above. Therefore, the direction in which the grooves 8 are polished and the direction in which the short fibers 42 are oriented are close to parallel. For this reason, the short fibers 42 are not easily cut by the blade that polishes the groove 8, and as shown in FIG. 14B, the short fibers 42 protrude long from the inner surface of the polished groove 8 in a curled state. It will be. In this way, the short fibers 42 are curled and protruded long on the inner surface of the groove 8, so that the amount of the short fibers 42 interposed between the pulleys and the ribs 9 when the rib belt is suspended and driven by the pulley. Therefore, the noise during traveling that occurs when the surface of the rib 9 directly contacts the pulley can be reduced.

  Next, another method for manufacturing a rib belt as a transmission belt will be described. First, an unvulcanized belt sleeve 4 is mounted on the outer periphery of the mold 1 in the same manner as in the steps of FIGS.

Then, the short fibers 10 are planted on the entire outer periphery of the unvulcanized belt sleeve 4 attached to the mold 1 as shown in FIG. The short fiber 10 is not particularly limited, and rayon, cotton, polyester fiber, nylon fiber, aramid fiber, vinylon fiber, carbon fiber, polytetrafluoroethylene fiber, or the like can be used. The fiber length of the short fibers 10 is preferably in the range of about 0.1 to 5.0 mm, and the aspect ratio (length / thickness) is preferably in the range of 30 to 300. Furthermore, the flocking density of the short fibers 10 on the outer periphery of the belt sleeve 4 is preferably about 1 to 50,000 fibers / cm ² . Of course, it is not limited to these ranges.

  In order to plant the short fibers 10 on the outer periphery of the belt sleeve 4, a known electrostatic flocking device can be used. Specifically, the mold 1 equipped with the belt sleeve 4 is installed on a turntable (not shown), and a spray nozzle (not shown) that is movable in the axial direction (vertical direction) of the mold 1 is provided with the belt sleeve 4. It arranges toward the outer peripheral surface of the. Then, an aqueous adhesive is applied to the outer peripheral surface of the belt sleeve 4 from the spray nozzle while rotating the mold 1 in the circumferential direction around the axis by the turntable, and an adhesive film is formed on the outer peripheral surface of the belt sleeve 4. As the water-based adhesive, for example, urethane emulsion, acrylic emulsion, vinyl acetate emulsion, styrene emulsion and the like can be used. Next, the short fiber 10 is attached to the outer peripheral surface of the belt sleeve 4 by a short fiber applicator (not shown) that is movable in the axial direction of the mold 1 while rotating the mold 1 in the same manner. That is, the mold 1 is grounded, an electric field is formed by applying a voltage to the electrode plate provided in the short fiber applicator, and the short fiber 10 subjected to electrodeposition treatment is supplied to the electrode plate of the short fiber applicator. Then, the short fiber 10 is charged, flies by receiving an electrostatic force from the electric field, collides with the outer peripheral surface of the belt sleeve 4 and adheres to the adhesive film. Here, the electrodeposition treatment is a treatment for adjusting the leakage resistance value and moisture of the short fiber 10 to improve the flight property of the short fiber 10. And after attaching the short fiber 10 to the outer peripheral surface of the belt sleeve 4 in this way with the adhesive film, the short fiber 10 is adhered to the outer peripheral surface of the belt sleeve 4 with the adhesive film by natural drying or heat drying. It can be fixed.

  After the short fibers 10 are implanted in the belt sleeve 4 in this manner, the belt sleeve 4 is set in the forming device 25 in the same manner as in the above-described FIGS. 4 and 5, and the belt sleeve 4 is compressed by heating and pressing. Mold.

  Next, when the compression-molded belt sleeve 4 is vulcanized by the vulcanizing mold 6, as the vulcanizing mold 6, as shown in FIG. What provided the convex part 41 for shaping | molding is used. The molding convex portion 41 is provided so as to extend over the entire inner circumference of the vulcanization mold 6 and is parallel to the direction perpendicular to the circumferential direction of the inner circumference of the vulcanization mold 6 at a predetermined constant interval. Many are provided. And this convex part 41 for shaping | molding is formed in the same height dimension as the convex part 41 for shaping | molding provided in above-mentioned FIG. 22 (a) in order to shape | mold the rib 9 in a rib belt, FIG. It is formed slightly larger than the forming convex portion 45 formed in b). Other configurations of the vulcanization mold 6 are the same as those in FIGS. 6 and 10.

  Then, the mold 1 equipped with the compression-molded unvulcanized belt sleeve 4 is set in the vulcanizing mold 6 as shown in FIG. 16, and the vulcanizing mold 6 is heated by the heating / cooling jacket 35 while supplying the fluid. A fluid such as air is supplied from the passage 23 between the outer periphery of the mold 1 and the inner periphery of the bladder 5, and the bladder 5 is expanded outwardly by air pressure as shown in FIG. The belt sleeve 4 wound around the belt is pressed against the inner peripheral surface of the vulcanizing mold 6, and the belt sleeve 4 can be heated and pressurized between the bladder 5 and the vulcanizing mold 6. It can be sulfurized. This vulcanization molding by heating and pressurization can be performed under the same conditions as described above. Further, the groove 8 can be formed on the outer periphery of the belt sleeve 4 by the molding convex portion 41 of the vulcanizing die 6 by pressing the belt sleeve 4 against the inner peripheral surface of the vulcanizing die 6 in this way. It is.

  After vulcanization in this way, the bladder 5 is contracted and returned to the original state, and the vulcanization mold 6 is cooled in the same manner as in the process of FIG. When the bladder 5 is contracted to the original state as described above, the outer diameter of the bladder 5 becomes smaller and becomes smaller than the inner diameter of the vulcanized belt sleeve 4A. Therefore, as shown in FIG. The mold 1 can be extracted while leaving the sleeve 4 </ b> A on the inner periphery of the vulcanization mold 6. Then, after the temperature of the belt sleeve 4A vulcanized by the cooled vulcanizing mold 6 is lowered to a temperature at which demolding is possible, the vulcanized belt sleeve 4A is taken out from the vulcanizing mold 6 as shown in FIG. It is something that can be done.

  A deep V-shaped groove 8 is formed on the outer periphery of the vulcanized belt sleeve 4A obtained in this way by the forming convex portion 41 of the vulcanizing mold 6 as described above. The rib 9 can be formed. Therefore, in this embodiment, it is not necessary to perform polishing for forming the ribs 9 as in the embodiment of FIG. 14, and the material loss due to polishing can be made zero.

  Next, the vulcanized belt sleeve 4A in which the ribs 9 are formed in this way is cut so as to be cut in a circle, thereby obtaining a rib belt having a plurality of ribs 9 in the belt direction in the belt width direction as shown in FIG. It is something that can be done. In FIG. 20, 46 is a compression rubber layer and 47 is a back rubber layer. Since the short fibers 10 are planted on the outer peripheral surface of the belt sleeve 4 as described above, the surface of the rib 9 of the ribbed belt produced as shown in FIG. 20 is covered with the planted layer of the short fibers 10. . By covering the surface of the rib 9 with the short fiber 10 in this way, the friction coefficient with respect to the pulley can be reduced when the ribbed belt is suspended from the pulley and travels. Can be reduced.

  In this embodiment, the short fibers 10 are implanted with the belt sleeve 4 mounted on the outer periphery of the mold 1, but the surface of the rubber sheet 3 b for forming a compressed rubber layer on the outer peripheral side of the belt sleeve 4 is used. Alternatively, the short fibers 10 may be implanted in advance. In this case, by winding the rubber sheet 3b around the mold 1, the belt sleeve 4 in which the short fibers 10 are planted on the outer peripheral surface can be formed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one process in an example of an embodiment of the present invention, where (a) is a perspective view and (b) is a partially enlarged sectional view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one process in an example of an embodiment of the present invention, where (a) is a perspective view and (b) is a partially enlarged sectional view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one process in an example of an embodiment of the present invention, where (a) is a perspective view and (b) is a partially enlarged sectional view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one process in an example of an embodiment of the present invention, where (a) is a perspective view and (b) is a partially enlarged sectional view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one process in an example of an embodiment of the present invention, where (a) is a perspective view and (b) is a partially enlarged sectional view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one process in an example of an embodiment of the present invention, where (a) is a perspective view and (b) is a partially enlarged sectional view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one process in an example of an embodiment of the present invention, where (a) is a perspective view and (b) is a partially enlarged sectional view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one process in an example of an embodiment of the present invention, where (a) is a perspective view and (b) is a partially enlarged sectional view. It is a perspective view which shows one process in an example of embodiment of this invention. In one example of other embodiment of the present invention, one process is shown, (a) is a perspective view and (b) is a partial expanded sectional view. In one example of other embodiment of the present invention, one process is shown, (a) is a perspective view and (b) is a partial expanded sectional view. In one example of other embodiment of the present invention, one process is shown, (a) is a perspective view and (b) is a partial expanded sectional view. It is a perspective view which shows one process in an example of other embodiment of this invention. An example of other embodiments of the present invention is shown, (a) and (b) are expanded sectional views of a part of a belt sleeve, respectively.

It is a perspective view which shows one process in an example of further another embodiment of this invention. In one example of further another embodiment of the present invention, one process is shown, (a) is a perspective view and (b) is a partial expanded sectional view. In one example of further another embodiment of the present invention, one process is shown, (a) is a perspective view and (b) is a partial expanded sectional view. In one example of further another embodiment of the present invention, one process is shown, (a) is a perspective view and (b) is a partial expanded sectional view. It is a perspective view which shows one process in an example of further another embodiment of this invention. It is a partial expanded sectional view which shows an example of the belt for transmission manufactured by further another embodiment of this invention. A conventional example is shown, and (a) and (b) are sectional views. It shows another conventional example, (a) is a sectional view of a part of a mold, and (b) is an enlarged sectional view of a part of a belt sleeve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Core wire 3 Rubber sheet 4 Belt sleeve 5 Bladder 6 Vulcanization type 7 Groove formation recessed part 8 Groove 9 Rib 10 Short fiber

Claims (6)

  An unvulcanized belt sleeve made of at least a core wire and a rubber sheet is wrapped around the outer peripheral surface of the mold, and the belt sleeve mounted on the mold is compressed by pressurizing, heating and compressing. A method for vulcanizing a belt sleeve for producing a transmission belt, wherein the belt sleeve is vulcanized by pressurizing and heating the belt sleeve in a vulcanization process.   Attach an unvulcanized belt sleeve consisting of at least a cord and a rubber sheet around the outer periphery of a mold bladder that has a stretchable bladder on the outer periphery, and heat and compress the belt sleeve while applying pressure from the outer periphery. After the molding to be performed, the mold equipped with the belt sleeve is placed in the vulcanization mold, and while the vulcanization mold is heated, the mold bladder is expanded to bring the belt sleeve to the inner periphery of the vulcanization mold. A method of vulcanizing a belt sleeve for producing a transmission belt, wherein the belt sleeve is vulcanized by pressing and pressing.   The method for vulcanizing a belt sleeve for producing a transmission belt according to claim 1 or 2, wherein the rubber sheet is formed of an ethylene / α-olefin elastomer as a rubber material.   Attach an unvulcanized belt sleeve consisting of at least a cord and a rubber sheet around the outer periphery of a mold bladder that has a stretchable bladder on the outer periphery, and heat and compress the belt sleeve while applying pressure from the outer periphery. After the molding to be performed, the mold equipped with the belt sleeve is placed in the vulcanization mold, and while the vulcanization mold is heated, the mold bladder is expanded to bring the belt sleeve to the inner periphery of the vulcanization mold. By pressing and pressurizing, the belt sleeve is vulcanized while forming a groove forming recess on the outer periphery of the belt sleeve, and a groove deeper than the groove forming recess is formed at the groove forming recess of the vulcanized belt sleeve. A method for manufacturing a transmission belt, characterized by forming a rib between grooves by polishing.   Attach an unvulcanized belt sleeve consisting of at least a cord and a rubber sheet around the outer periphery of a mold bladder that has a retractable bladder on the outer periphery. Short fibers are planted on the outer peripheral surface of the belt sleeve. At the same time, the belt sleeve in which the short fibers are planted is molded by pressurizing and compressing the belt sleeve from the outer peripheral side, and then the mold equipped with the belt sleeve is placed in the vulcanizing mold, and the vulcanizing mold is mounted. While heating, the mold bladder is expanded and the belt sleeve is pressed against the inner periphery of the vulcanizing mold to pressurize the belt sleeve while forming the groove on the outer periphery of the belt sleeve and vulcanizing the belt sleeve. A method of manufacturing a transmission belt, comprising forming a rib.   6. The method of manufacturing a transmission belt according to claim 4, wherein the rubber sheet is formed of an ethylene / α-olefin elastomer as a rubber material.

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