JP2012250349A - Method for manufacturing toothed belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a toothed belt, in which a core wire and tooth cloth having uniform strength in the circumferential direction are formed, and the toothed belt having high strength and high reliability is manufactured.SOLUTION: The method includes: a first process of forming the tooth cloth on an outer periphery of a cylindrical mandrel by braiding and arranging the tooth cloth around a mold arranged inside the mandrel; a second process of separating the tooth cloth and the mandrel in a posture in which the tooth cloth is arranged around the mold; a third process of forming the core wire around the tooth cloth by braiding; and a fourth process of integrating the core wire, the tooth cloth, a belt toothing, and a belt groove, by use of a belt material. In the fourth process, the tooth cloth is guided to a mold side to be arranged on surfaces of the belt toothing and the belt groove of the toothed belt.

Description

  The present invention relates to a method for manufacturing a toothed belt, and more particularly to a method for manufacturing a toothed belt for power transmission in which belt strength is increased by a seamless core and a tooth cloth.

  Conventionally, for example, a toothed belt has been widely used as a member for transmitting power between two shafts in an automobile engine, a machine tool, or the like. In particular, a toothed belt used in an engine is also called a “timing belt”.

  The above-described toothed belt is generally made of synthetic rubber or polyurethane resin, and is lighter than a roller chain made of metal, and is flexible, so it has low noise during rotation. Lubrication work is also unnecessary. On the other hand, toothed belts have problems related to rigidity and durability because the strength of the material itself is low and cutting due to deterioration of the material is likely to occur.

  Therefore, in the conventional toothed belt, a core wire made of, for example, glass fiber or aramid fiber is embedded inside the toothed belt, and the surface of the belt tooth portion is reinforced with a tooth cloth made of nylon woven cloth. By suppressing the elongation in the longitudinal direction, the rigidity of the entire toothed belt is improved.

  Here, a conventional method for manufacturing a toothed belt will be described with reference to FIG. First, a tooth cloth S having a predetermined size is cut from the tooth cloth sheet, and both ends of the tooth cloth S are stitched (sewn part H) to form an annular shape. Next, an annular tooth cloth S is mounted around a mold K whose outer peripheral surface has a shape complementary to the belt tooth portion and belt groove portion of the toothed belt. A core C made of glass fiber or fiber bundle is spirally wound around the tooth cloth S, and a belt material F made of synthetic rubber is wound around the core C. Then, after vulcanizing the belt material F in a high temperature atmosphere, the belt material G is cooled to a predetermined temperature, and the core C and the tooth cloth S are integrally formed with the belt material G. As a result, the core C is embedded therein, the belt tooth portions T and the belt groove portions D are alternately formed, and an annular belt slab A in which the tooth tip side surface is covered with the tooth cloth S is formed. Then, the belt slab A is removed from the forming die K and cut into a predetermined width with a roller cutter, whereby a toothed belt is produced.

  By the way, in the above-described toothed belt, a stitched portion H that can be a weak structural portion exists in a part of the annularly formed tooth cloth S.

  For example, as shown in FIG. 9A, when the force F acts on the belt tooth portion T during power transmission, the belt tooth portion T is deformed so as to fall in the direction of the force F, and the belt tooth portion T and the belt groove portion. A tensile force in the direction of arrow X acts on the boundary portion P of the tooth root that becomes the boundary of D, and a tensile force in the direction of arrow Y in the opposite direction acts on the boundary portion Q. Therefore, as shown in the figure, when a stitched portion H that can be a weak structure exists in the belt groove portion D, a tensile stress acts on the stitched portion H, and when it reaches a predetermined stress, the stitched portion H In this case, there is a problem in that the cut of the tooth cloth S occurs, and the shear failure toward the inside of the belt material G progresses from that point as a starting point (broken line L) and the belt B breaks. Further, as shown in FIG. 9B, when the stitched portion H exists at the boundary portion P of the tooth root that is the boundary between the belt tooth portion T and the belt groove portion D, the belt tooth portion T is deformed. When the stress is concentrated at the stitching portion H and reaches a predetermined stress, the tooth cloth S is cut at the stitching portion H, and the shear fracture toward the inside of the belt material G progresses from that. (Broken line M), there is also a problem that the belt tooth portion T on the upper portion thereof is missing. Therefore, the development of a toothed belt that can suppress the breakage of the tooth cloth S and effectively prevent the toothed belt B from being broken even under high load conditions is desired.

  With respect to the above problems, Patent Documents 1 to 3 disclose a method for manufacturing a toothed belt for the purpose of increasing belt strength.

  In the method of manufacturing a toothed belt disclosed in Patent Document 1, a tooth cloth having a urethane impermeable resin layer is wound around a cylindrical mold provided with tooth groove groups, This is a method in which a core wire is spirally wound around and the tooth cloth and the core wire are integrated with a belt material made of polyurethane elastomer.

  Moreover, the manufacturing method of the toothed belt disclosed in Patent Document 2 includes an impervious resin layer in which a canvas woven with warp and weft and an adhesive layer having a predetermined thickness is formed on one side of a base material layer, The base material layer is laminated so that it is located outside, and this is heated and pressed to melt the adhesive layer, and the melted adhesive is bitten into the canvas to form a tooth cloth. This is a method for producing a toothed belt by arranging it on the surface.

  Further, in the method for manufacturing a toothed belt disclosed in Patent Document 3, a tooth cloth coated with a polyurethane elastomer is sandwiched between a pair of mold boards, and this is heated and pressed to perform tooth mold shaping of the tooth cloth. This is a method for producing a toothed belt by winding the tooth cloth after the tooth mold is formed on a mold.

JP-A-6-213282 JP-A-6-213283 Japanese Patent Laid-Open No. 1-24610

  In the manufacturing method of the toothed belt disclosed in Patent Document 1, it is excellent in heat resistance and cold resistance by using a polyurethane elastomer obtained by blending a prepolymer made of a predetermined material as a belt material with a curing agent. A toothed belt can be manufactured.

  In addition, in the method for manufacturing a toothed belt disclosed in Patent Document 2, the tooth cloth and the impermeable resin layer can be firmly bonded by the anchor effect of the adhesive layer, It is possible to reduce tooth wear even under load conditions, and to manufacture a toothed belt having excellent durability.

  Moreover, in the manufacturing method of the toothed belt disclosed in Patent Document 3, the tooth cloth can be placed at an accurate position of the forming die by performing the tooth cloth molding work in advance, and the tooth cloth is displaced. A high-quality toothed belt can be manufactured while suppressing wrinkling and bending.

  However, in the manufacturing method of the toothed bell disclosed in Patent Documents 1 and 2, the tooth cloth used in the toothed belt is cut from the tooth cloth sheet to a predetermined length, and then bonded by hot press. Alternatively, it is endlessly processed into a cylindrical shape by welding or the like, and there is still a joint portion that can be a weak structure portion in a part of the tooth cloth. Moreover, the strength in the circumferential direction of the tooth cloth becomes non-uniform due to the joint portion, which makes the strength of the entire toothed belt non-uniform, and there is a problem that stress is concentrated at a specific location during use.

  Moreover, in the manufacturing method of the toothed belt currently disclosed by patent document 3, after arrange | positioning the tooth cloth after shaping | molding in the predetermined position of a shaping | molding die, the both ends are lightly pressed and formed in endless form. For this reason, there is a problem in that the strength at the end of the tooth cloth is different from the strength at other places, and the strength in the circumferential direction of the tooth cloth is not uniform. Moreover, in order to improve quality, it is necessary to perform a mold work in advance, and there is a problem that leads to an increase in manufacturing man-hours.

  The present invention has been made in view of the above-described problems, and there is no joint that can be a structural weak portion in the circumferential direction with respect to the cord and the tooth cloth, and the belt has a uniform strength in the circumferential direction, thereby improving the belt strength. It is an object of the present invention to provide a method for manufacturing a toothed belt that can be enhanced in an economical manner.

  In order to achieve the above object, a method for manufacturing a toothed belt according to the present invention includes a core wire embedded therein, belt belt portions and belt groove portions formed alternately, and a tooth cloth on the surface of the belt tooth portion and belt groove portion. A toothed belt having an annular shape, wherein a tooth cloth is formed on the outer peripheral surface of a cylindrical mandrel having a peripheral length of the inner peripheral surface of the toothed belt by braiding, and the inside of the mandrel A first step of arranging the tooth cloth around a molding die whose outer peripheral surface has a shape complementary to a belt tooth portion and a belt groove portion of the toothed belt; A second step of separating the tooth cloth and the mandrel in a posture in which the tooth cloth is arranged around the mold; a third step of forming a core wire by braiding around the mold and the tooth cloth; Line, tooth cloth, belt tooth and belt groove The belt material is integrated with a belt material to form a belt tooth portion and a belt groove portion. In the fourth step, the tooth cloth is guided to the mold side, and the tooth cloth is formed on the toothed belt. It is arrange | positioned on the surface of a belt tooth part and a belt groove part.

  Here, the core wire is composed of a highly heat-resistant and highly rigid fiber bundle that retains the rigidity in the longitudinal direction (circumferential direction) of the toothed belt, and as a material constituting this fiber bundle, for example, Para-aramid fibers, meta-aramid fibers, wholly aromatic polyester fibers, ultrahigh molecular weight polyester fibers, carbon fibers, glass fibers, metal fibers, and the like can be applied.

  The tooth cloth can be made of, for example, nylon fiber.

  In addition, as the belt material, for example, synthetic rubber such as chloroprene rubber or nitrile butadiene rubber, or polyurethane resin having higher rigidity than synthetic rubber can be applied.

  The above-described core wire and tooth cloth are made of fibers having a melting point higher than the vulcanization temperature of synthetic rubber or fibers having a melting point higher than the curing temperature of the polyurethane resin. Moreover, it is preferable that the core wire formed by braiding transmits the melted belt material, and the tooth cloth formed by braiding does not transmit the melted belt material.

  According to the manufacturing method described above, by forming both the core wire and the tooth cloth by braiding, there is no seam in the circumferential direction of the toothed belt, and the core wire and the tooth cloth having uniform rigidity in the circumferential direction. It can be formed easily. Therefore, when the core wire and the tooth cloth are integrated with the belt material and the belt tooth portion and the belt groove portion are formed to produce the annular toothed belt, the strength of the entire toothed belt is made uniform and the belt strength is effectively improved. Can be increased. In addition, by appropriately changing the number of repetitions of braiding, the type of fiber used in the braiding, and the crossing angle, the thickness of the cord and the tooth cloth and the strength in each direction can be easily adjusted. The entire area of the belt can be effectively strengthened.

  Here, in the first step, after forming a tooth cloth by braiding on the outer peripheral surface of the cylindrical mandrel, the mold may be arranged inside the mandrel, or the cylindrical mandrel After the mold is placed inside the toothbrush, a tooth cloth may be formed on the outer peripheral surface of the mandrel by braiding.

  In the fourth step, a belt material is disposed around the core wire formed around the mold and the tooth cloth, and the belt material is melted in a high temperature atmosphere so that the core wire and the tooth are melted. The cloth, the belt tooth portion, and the belt groove portion may be integrated with a belt material, or a separate molding die is disposed around the core wire formed around the molding die and the tooth cloth. The belt material may be impregnated in a region defined by a separate mold, and the core wire, the tooth cloth, the belt tooth portion, and the belt groove portion may be integrated with the belt material.

  Here, when the belt material is vulcanized, for example, synthetic rubber such as chloroprene rubber can be applied. When the belt material is impregnated in the area defined by the mold and the separate mold, urethane, polyester, and polyamide thermoplastic elastomer resins and flexible thermoplastic resins can be applied. In particular, urethane-based polyurethane resin or the like is used.

  If the tooth cloth formed by braiding does not penetrate the belt material as described above, when the belt material is vulcanized or impregnated in the fourth step, synthetic rubber or polyurethane is used. The tooth cloth can be reliably guided to the inner peripheral surface side of the toothed belt by the fluid pressure when the belt material such as resin flows.

  The toothed belt obtained by the manufacturing method of the present invention has no cords in the circumferential direction of the toothed belt having an annular shape, and has a cord and a tooth cloth having substantially uniform strength in the circumferential direction. It becomes a toothed belt with belt strength. Moreover, by producing the core wire and the tooth cloth by braiding, the process of sewing the end portion of the tooth cloth becomes unnecessary, and the manufacture of the core wire and the tooth cloth becomes easy. In addition, by using a braiding formed by combining a plurality of fibers or fiber bundles at an appropriate crossing angle, for example, the core wire can be formed in multiple layers, and the strength and crossing angle of the fibers used for the braiding Thus, the thickness and strength of the core wire and the tooth cloth can be easily adjusted, and the strength of the toothed belt can be effectively increased.

  As can be understood from the above description, according to the method for manufacturing a toothed belt of the present invention, it is easy to manufacture a core wire or a tooth cloth constituting the toothed belt, and a joint portion or the like that can be a structural weak part is generated. Therefore, it is possible to form a cored wire or a tooth cloth having uniform strength in the circumferential direction, and thus it is possible to provide a toothed belt in which the entire toothed belt is strengthened and damage is suppressed.

It is a flowchart of Embodiment 1 of the manufacturing method of the toothed belt of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the figure explaining the 1st process of Embodiment 1 of the manufacturing method of the toothed belt of this invention, (a) is the figure explaining the process of forming a tooth cloth by braiding on the outer peripheral surface of a mandrel. FIG. 4B is a perspective view schematically showing a tooth cloth formed by braiding, and FIG. 2C is a view taken along arrow A-A in FIG. FIG. 3 is a diagram for explaining a second step of the first embodiment of the manufacturing method of the toothed belt of the present invention following the first step shown in FIG. 2, wherein (a) separates the tooth cloth and the mandrel. It is a figure explaining a process, (b) is a BB arrow line view of Drawing 3 (a). FIG. 4 is a diagram for explaining a third step of the first embodiment of the method for manufacturing a toothed belt according to the present invention following the second step shown in FIG. 3, wherein (a) is a braiding around a tooth cloth; 4B is a diagram illustrating a process of forming a core wire, and FIG. 4B is a view taken along the line CC in FIG. FIG. 5 is a diagram illustrating a fourth step of the first embodiment of the method for manufacturing a toothed belt according to the present invention following the third step shown in FIG. 4, wherein (a) shows a belt material around a core wire; (B) is a DD arrow view of FIG. 5 (a), and (c) is a process of melting the belt material in a high temperature atmosphere to create a cord and a tooth cloth. It is the longitudinal cross-sectional view which showed the toothed belt which integrated the belt tooth part and the belt groove part with the belt material. It is a flowchart of Embodiment 2 of the manufacturing method of the toothed belt of this invention. It is a figure explaining the 4th process of Embodiment 2 of the manufacturing method of a toothed belt of the present invention, and (a) arranges a separate mold around a core line following the 3rd process. (B) is an EE arrow view of FIG. 7 (a), and (c) is a diagram in which a belt material is impregnated in an area defined by a mold and a separate mold. FIG. 5 is a longitudinal sectional view showing a toothed belt in which a core wire, a tooth cloth, a belt tooth portion, and a belt groove portion are integrated with a belt material. It is a figure explaining the manufacturing method of the conventional toothed belt. It is the longitudinal cross-sectional view which showed the conventional toothed belt, Comprising: (a) is a figure which showed the toothed belt in which a stitching | suture part exists in a belt groove part, (b) is a stitching part in a belt tooth part and a belt groove part. It is the figure which showed the toothed belt which exists in the boundary part of the tooth base used as a boundary.

  Embodiments 1 and 2 of a method for manufacturing a toothed belt according to the present invention will be described below with reference to the drawings.

[Embodiment 1]
FIG. 1 shows a flowchart of the manufacturing method of the toothed belt according to the first embodiment. As shown in the drawing, first, in the first step, a tooth cloth is formed on the outer peripheral surface of the cylindrical mandrel by braiding, and the tooth cloth is placed around the mold placed inside the mandrel (S11). . Next, in the second step, the tooth cloth and the mandrel are separated in a posture in which the tooth cloth is disposed around the mold (S12). Next, in the third step, a core wire is formed by braiding around the mold and the tooth cloth (S13). In the fourth step, a belt material is arranged around the core wire, the belt material is melted in a high-temperature atmosphere, and the core wire and the tooth cloth are integrated with the belt material. The groove portions are alternately formed (S14). Here, in the fourth step, the tooth cloth is guided to the mold side and disposed on the surface of the belt tooth portion and the belt groove portion of the toothed belt.

  2-5 is the figure which demonstrated the 1st process-the 4th process of Embodiment 1 of the manufacturing method of the toothed belt of this invention concretely.

  First, as shown in FIG. 2A, in the first step, the tooth cloth 6 is formed on the outer peripheral surface of the cylindrical mandrel 60 by braiding. Further, in the first step, a molding die 50 having an outer peripheral surface complementary to the belt tooth portion 4 and the belt groove portion 5 (see FIG. 5C) of the toothed belt 10 inside the mandrel 60. Place. Accordingly, the tooth cloth 6 formed by the above-described braiding is disposed around the mold 50.

  Here, as shown in FIG. 2B, the tooth cloth 6 formed by the braiding described above has a configuration in which a plurality of fibers (twisted yarns) are knitted together at a specific crossing angle. More specifically, the cylindrical tooth cloth 6 shown in FIG. 2B is composed of two fibers (twisted yarns) 1A and 1B inclined in the axial direction and fibers extending in the axial direction. (Twisted yarn) 2 and the fibers 1A and 2 are knitted by crossing each other at a crossing angle θA, and the fibers 1B and 2 are crossing at a crossing angle θB. Here, the tooth cloth 6 has a very small gap between the knitted fibers, and a plurality of fibers are closely knitted so that the belt material (for example, synthetic rubber) melted in the fourth step described later does not pass through. Yes. The crossing angles θA and θB between the fibers can be appropriately set within a range of 10 ° to 80 °, for example, according to the stretchability in the axial direction or the circumferential direction of the tooth cloth 6 or the required strength. Further, the fiber 1A, the fiber 1B, and the fiber 2 may be composed of the same type of fibers, or may be composed of different types of fibers.

  The tooth cloth 6 formed in the first step described above is arranged on the surfaces of the belt tooth portion 4 and the belt groove portion 5 of the toothed belt 10 in the fourth step described later. Therefore, the outer peripheral surface of the mandrel 60 on which the tooth cloth 6 is formed has the same peripheral length as the peripheral length of the inner peripheral surface of the toothed belt 10, that is, the outer peripheral surface of the molding die 50 shown in FIG. Is.

  Next, in the second step, as shown in FIG. 3A, the tooth cloth 6 and the mandrel 60 are separated in a posture in which the tooth cloth 6 is disposed around the mold 50. When the tooth cloth 6 and the mandrel 60 are separated, the end part of the tooth cloth 6 is grasped by a grasping portion (not shown), and the mandrel 60 is pulled out of the tooth cloth 6 so that the tooth cloth 6 and the mandrel 60 are separated. It can be easily separated. When the tooth cloth 6 and the mandrel 60 are separated, a gap as shown in FIG. 3B is generated between the mold 50 and the tooth cloth 6.

  After disposing the tooth cloth 6 around the mold 50 in this way, as shown in FIG. 4A, in the third step, the core wire 3 is braided around the mold 50 and the tooth cloth 6 by braiding. Form. In this third step, as shown in FIG. 4B, the tooth cloth 6 is pressed against the molding die 50 by the winding force of the core wire 3, so that the molding die 50 and the tooth shown in FIG. The gap between the cloth 6 is eliminated, and a part of the tooth cloth 6 enters the groove 51 of the mold 50 and is arranged.

  Here, although the above-mentioned core wire 3 is produced by braiding similarly to the tooth cloth 6, the gap between the knitted fibers is relatively large as compared with the tooth cloth 6, and in the fourth step described later. The melted belt material can pass through the core wire 3 through the gap. That is, the core wire 3 has a configuration in which fibers used for braiding are knitted relatively loosely as compared with the tooth cloth 6. On the other hand, the core wire 3 can be configured to have a laminated structure by overlapping fibers by appropriately setting the crossing angle of the fibers used for braiding, and the stretchability of the toothed belt 10. And the strength can be adjusted as appropriate.

  Then, after forming the tooth cloth 6 and the core wire 3 around the mold 50, in the fourth step, the belt material 8 is arranged around the tooth cloth 6 and the core wire 3, and the belt material 8 is placed in a high temperature atmosphere. Then, the core wire 3, the tooth cloth 6, the belt tooth portion 4, and the belt groove portion 5 are integrated with the belt material 7. More specifically, first, as shown in FIGS. 5A and 5B, a belt material 8 made of synthetic rubber is wound around the tooth cloth 6 and the core wire 3 and arranged. These are placed in a high temperature atmosphere, and the belt material 8 is melted and then cooled to a predetermined temperature to solidify the belt material 8 and, as shown in FIG. The belt tooth portion 4 and the belt groove portion 5 are integrated with a belt material 7.

  Here, in the vulcanization process described above, the core wire 3 transmits the melted belt material 8, and the tooth cloth 6 does not transmit the belt material 8. Therefore, as shown in FIG. The belt material 8 disposed around the core wire 3 and melted in a high-temperature atmosphere flows through the gap between the woven fibers of the core wire 3 toward the mold 50, and the tooth cloth 6 flows in the flow direction. It is guided to the mold 50 side by pressure (fluid pressure), and is disposed on the surface (the mold side) of the belt tooth portion 4 and the belt groove portion 5 of the toothed belt 10.

  In addition, in the molded product of the toothed belt 10 described above, after demolding, the back surface is polished and surface-treated, and a lot number or the like is printed on the back surface and cut into a desired width by a roll cutter or the like.

  By using the manufacturing method described above, as shown in FIG. 5C, the core wire 3 that is seamless in the circumferential direction of the toothed belt 10 is embedded inside, and the belt tooth portions 4 and the belt groove portions 5 are alternately arranged. Thus, a toothed belt 10 having a tooth cloth 6 that is seamlessly formed on the surfaces of the belt tooth portion 4 and the belt groove portion 5 is manufactured. Thus, by producing the core wire 3 and the tooth cloth 6 by braiding, the core wire 3 and the tooth cloth 6 having substantially uniform strength in the circumferential direction (longitudinal direction) of the toothed belt 10 can be formed. In addition, it is possible to suppress the occurrence of the weak structure portion, suppress the breakage of the core wire 3 and the tooth cloth 6, effectively increase the strength of the toothed belt 10, and improve the product reliability of the toothed belt 10. Therefore, for example, the width of the toothed belt can be reduced even when used in an automobile engine, and the size of the toothed belt and engine parts can be reduced while maintaining high rigidity and high quality. it can.

[Embodiment 2]
The second embodiment is a method for manufacturing a toothed belt in which a resin impregnation step is applied instead of the vulcanization step in the fourth step of the first embodiment.

  FIG. 6 shows a flow chart of the manufacturing method of the toothed belt according to the second embodiment. As shown in the drawing, first, in the first step, a tooth cloth is formed on the outer peripheral surface of the cylindrical mandrel by braiding, and the tooth cloth is placed around the mold placed inside the mandrel (S21). . Next, in the second step, the tooth cloth and the mandrel are separated in a posture in which the tooth cloth is arranged around the mold (S22). Next, in the third step, a core wire is formed by braiding around the mold and the tooth cloth (S23). In the fourth step, a separate molding die is arranged around the core wire, the belt material is impregnated with the belt material in an area defined by the molding die and the separate molding die, and the core wire and the tooth cloth are integrated with the belt material. Then, the belt tooth portion and the belt groove portion of the toothed belt are alternately formed (S24). Here, in the fourth step, the tooth cloth is guided to the mold side and disposed on the surface of the belt tooth portion and the belt groove portion of the toothed belt.

  FIG. 7 is a diagram for explaining a fourth step of the second embodiment of the method for manufacturing a toothed belt according to the present invention. FIG. 7 (a) is a diagram around the core line following the third step. It is a figure explaining the process of arrange | positioning another shaping | molding die, FIG.7 (b) is an EE arrow line view of Fig.7 (a), FIG.7 (c) is a shaping | molding die and a separate shaping | molding die. It is the figure which showed the toothed belt which made the core material, the tooth cloth, the belt tooth part, and the belt groove part integrated with the belt material by impregnating the belt material into the defined area.

  In addition, since the 1st process-3rd process in Embodiment 2 are the processes similar to the 1st process-3rd process of Embodiment 1 shown in FIGS. Description is omitted.

  In the second embodiment, as described with reference to FIGS. 2 to 4, after forming the tooth cloth 16 and the core wire 13 around the mold 70 by the first to third steps, In the fourth step, a separate molding die 80 is disposed around the core wire 13, and a belt material (not shown) is impregnated in a region defined by the molding die 70 and the separate molding die 80. The tooth cloth 16, the belt tooth portion 14, and the belt groove portion 15 are integrated with a belt material 17. More specifically, first, as shown in FIG. 7A and FIG. 7B, a separate molding die 80 including two movable dies 81 and 82 is disposed around the core wire 13. Then, after impregnating a belt material made of polyurethane resin into an area defined by the mold 70, the movable die 81, and the movable die 82, the belt material is solidified by cooling to a predetermined temperature, as shown in FIG. Thus, the core wire 13, the tooth cloth 16, the belt tooth portion 14, and the belt groove portion 15 are integrated with the belt material 17.

  Here, in the resin impregnation step described above, the belt material is injected from a resin injection port (not shown) provided at a predetermined position of a separate mold 80 and filled, so that the belt material is a fiber of the core wire 13. Like the first embodiment, the tooth cloth 16 is guided to the mold 70 side by pressure (fluid pressure) in the flow, and the belt of the toothed belt 20 is flowed. It will be arrange | positioned on the surface (molding die side) of the tooth | gear part 14 and the belt groove part 15. FIG.

  Thus, the rigidity of the entire belt can be increased by using, for example, polyurethane resin as the belt member 17 and integrating the core wire 13, the tooth cloth 16, the belt tooth portion 14, and the belt groove portion 15 as compared with the case of using synthetic rubber. Can be increased.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

DESCRIPTION OF SYMBOLS 1A, 1B ... Fiber of the direction inclined with respect to axial direction, 2 ... Fiber of axial direction, 3 ... Core wire, 4 ... Belt tooth part, 5 ... Belt groove part, 6 ... Tooth cloth, 7 ... Belt material ( Synthetic rubber), 8 ... belt material, 10 ... toothed belt, 50 ... mold, 60 ... mandrel

Claims (6)

A manufacturing method of a toothed belt in which a core wire is embedded, a belt tooth portion and a belt groove portion are alternately formed, and an annular shape including a tooth cloth is provided on the surface of the belt tooth portion and the belt groove portion,
A tooth cloth is formed by braiding on an outer peripheral surface of a cylindrical mandrel having a peripheral length of an inner peripheral surface of the toothed belt, the toothed belt is disposed inside the mandrel, and the outer peripheral surface is a belt tooth portion of the toothed belt and A first step of disposing the tooth cloth around a mold having a shape complementary to the belt groove;
A second step of separating the tooth cloth and the mandrel in a posture in which the tooth cloth is disposed around the mold;
A third step of forming a core wire by braiding around the mold and the tooth cloth;
It consists of a fourth step of forming the belt tooth portion and the belt groove portion by integrating the core wire, the tooth cloth, the belt tooth portion and the belt groove portion with the belt material,
In the fourth step, the toothed cloth is guided to the mold side, and the toothed cloth is disposed on the surface of the belt tooth part and the belt groove part of the toothed belt.   In the first step, after forming a tooth cloth by braiding on the outer peripheral surface of the cylindrical mandrel, the molding die is arranged inside the mandrel, or the molding die is placed inside the cylindrical mandrel. 2. The method for manufacturing a toothed belt according to claim 1, wherein a tooth cloth is formed on the outer peripheral surface of the mandrel by braiding.   In the fourth step, a belt material is disposed around the core wire formed around the mold and the tooth cloth, and the belt material is melted in a high temperature atmosphere so that the core wire, the tooth cloth, and the belt. The method for manufacturing a toothed belt according to claim 1 or 2, wherein the tooth portion and the belt groove portion are integrated with a belt material.   The method for manufacturing a toothed belt according to claim 3, wherein the belt material is made of synthetic rubber.   In the fourth step, a separate mold is arranged around the core wire formed around the mold and the tooth cloth, and a belt is formed in an area defined by the mold and the separate mold. The manufacturing method of the toothed belt according to claim 1 or 2, wherein the core wire, the tooth cloth, the belt tooth portion, and the belt groove portion are integrated with a belt material by impregnating the material. The method for manufacturing a toothed belt according to claim 5, wherein the belt material is made of polyurethane resin.

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