JP2008008485A - Driving belt and manufacturing method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily manufacturable driving belt having high rupture strength and to provide a manufacturing method for the driving belt. <P>SOLUTION: This driving belt B1 is provided with an annular metal cord C1 and a coated part 70. The annular metal cord C1 is formed when an outer layer part 4 covering the outer circumferential face of an annular core part 3 is formed and then a start end part and a terminal end part of a strand material 1 are connected together by means of a connecting member 7. The outer layer part 4 is formed when the strand material 1 continuing from the annular core part 3 is wound around the annular core part 3 six times spirally while forming the annular core part 3 by winding the strand material 1, which is formed by twisting six metal strands 5 together, with a predetermined annular diameter and temporarily fixing its start end part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a transmission belt and a manufacturing method thereof.

Conventionally, as a kind of transmission belt, for example, as described in Patent Document 1, a belt using a metal cord as a core material is known. The metal cord serving as the core material includes at least one filament serving as a central core and a plurality of filaments surrounding the central core.
Further, as described in Patent Document 2, a transmission belt using a twisted cord as a core material is also known. In this transmission belt, the ends of the pair of twisted cords are once untwisted and joined, and then twisted again after joining as a core material.
JP-A-4-307146 JP 2000-213601 A

In the power transmission belt described in Patent Document 1, it is necessary to work by joining both ends of the metal cord into an annular shape. When joining both ends of the metal cord, the method of joining twisted cords described in Patent Document 2 can be applied to the metal cord. However, when the joining method described in Patent Document 2 is applied, filament untwisting work, joining work, and twisting work occur. For this reason, the process for coupling becomes complicated, and it becomes difficult to manufacture the transmission belt. Further, when the ends of the filament are twisted again, the twisted state differs between the bonded portion and the other portion, which may reduce the mechanical strength of the bonded portion. When the mechanical strength of the joint portion is reduced, the metal cord is broken, and as a result, the transmission belt is easily broken.
As a method of joining both ends of the metal cord, a method of joining both ends of the metal cord together is also conceivable. However, in this method, since the coupling portion is concentrated at one place in the circumferential direction, the metal cord is easily broken completely.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission belt that is less likely to break and that is easy to manufacture and a method for manufacturing the same.

  A transmission belt according to the present invention capable of solving the above-described problems includes an annular metal cord serving as a tensile body and a covering portion covering the annular metal cord, and the annular metal cord is formed by twisting a plurality of metal strands. An annular core portion formed in an annular shape by a combined strand material, and an outer layer portion wound around the annular core portion in a spiral manner and covering the outer peripheral surface of the annular core portion, The annular core portion and the outer layer portion are formed of a continuous strand material.

  As described above, the annular metal cord serving as the strength member is wound around the annular core portion and a plurality of spiral cores around the annular core portion by the strand material formed by twisting a plurality of metal strands. The outer layer portion that covers the outer peripheral surface of the outer peripheral portion is formed, and the annular core portion and the outer layer portion are formed of a continuous strand material, so that the annular metal cord can be made durable, and a plurality of strand materials can be arranged in the circumferential direction. The possibility that the annular metal cord is completely broken can be suppressed as compared with a case where the annular metal cords are joined together at one place. Furthermore, since the external force applied to the annular metal cord can be received by the continuous annular core portion and the outer layer portion, the applied external force can be dispersed throughout the entire annular metal cord, and the local concentration of the load can be avoided. Therefore, since the annular core portion is formed from the strand material and the strand material is continuously wound around the annular core portion as an axis, an annular metal cord having a high breaking strength can be obtained.

  Moreover, when forming the outer layer portion, instead of winding a plurality of strand materials, the strand material constituting the annular core portion is continuously wound over a plurality of circumferences, so only one strand material is required. Compared with the case where a plurality of strand materials are used, the number of joints is reduced, so that a reduction in the breaking strength of the annular metal cord can be suppressed and the manufacturing can be facilitated. Further, if the strand material of the outer layer portion is wound at a predetermined winding angle, an annular metal cord having a substantially uniform surface state can be obtained without the strand material being disturbed. Such an annular metal cord is prevented from concentrating a force from the outside on a specific portion and is uniformly applied, so that a decrease in breaking strength can be suppressed.

  Thus, according to the present invention, it is possible to obtain an annular metal cord that is easy to manufacture and excellent in breaking strength. Therefore, a transmission belt in which such an annular metal cord is covered with a covering portion is also less likely to break and easy to manufacture.

  Preferably, an annular core portion and an outer layer portion are formed by one strand material, and both ends of the strand material are bonded to each other. Thereby, since it becomes only one place with few joint places compared with the case where two or more strand materials are used, while being able to suppress the fall of the breaking strength of an annular metal cord, manufacture can be made easy. In addition, since the cross-sectional area of the joining portion is only one strand material, the difference from the other portion of the load when the annular metal cord is bent can be reduced to suppress the decrease in breaking strength. Accordingly, the transmission belt can also be prevented from being reduced in breaking strength, and can be easily manufactured.

  Preferably, one end portion of the strand material is a starting end portion that forms an annular core portion, and the other end portion of the strand material is an end portion that forms an outer layer portion. Thereby, it can be set as the cyclic | annular metal cord with a big fracture | rupture strength by which the start end part of the strand material which formed the cyclic | annular core part, and the termination | terminus part of the strand material which formed the outer layer part were couple | bonded. As a result, the transmission belt is also more difficult to break.

  Alternatively, one end portion of the strand material may be an extra length portion when the annular core portion is formed, and the extra length portion may constitute a part of the outer layer portion. As a result, the end of the extra length portion when the annular core portion is formed and the end portion of the strand material forming the outer layer portion are joined together, and the extra length portion is made a part of the outer layer portion and has a high breaking strength. An annular metal cord can be used. As a result, the transmission belt is also more difficult to break.

  Preferably, the ends of the strand material are joined together using a connection member. Thereby, the joining part of a strand material can be made harder to fracture | rupture. As a result, the transmission belt is also more difficult to break.

  Preferably, the ends of the strand material are bonded together by welding, and the bonded portion is covered and bonded by a connecting member made of a coil spring-like sleeve. Thereby, the end portions of the strand material can be easily connected to each other, and the connecting portion can be protected and reinforced by the connecting member. In addition, since the coil spring-like sleeve has good flexibility, it is flexibly deformed in accordance with the curved shape of the spirally wound strand material and maintains a tight contact state with the joined portion, and the strand material in the joined portion is also maintained. The connecting member does not hinder the deformation. That is, the mechanical properties of the annular metal cord can be made substantially uniform over the entire circumference. Therefore, the transmission belt can be easily manufactured and the mechanical characteristics can be made uniform.

  Preferably, the diameter of the metal strand is 0.06 mm or more and 0.40 mm or less. Thereby, moderate rigidity can be given to a strand material and a strand material can have favorable fatigue resistance. As a result, the annular metal cord and thus the transmission belt can be made more durable. The diameter of the metal strand is more preferably 0.06 mm or more and 0.22 mm or less.

  Preferably, the twist direction of the metal strand is opposite to the winding direction of the outer layer portion with respect to the annular core portion. Thereby, after winding of a strand material, the cyclic | annular metal cord with few unevenness | corrugations in the surface appearance can be obtained. Also, the annular metal cord can be made difficult to twist. By using such an annular metal cord, the transmission belt is more difficult to break.

  Preferably, the winding angle of the strand material with respect to the central axis of the annular core portion is not less than 4.5 degrees and not more than 13.8 degrees. As a result, the winding work of the strand material is facilitated, so that the annular metal cord and the transmission belt can be manufactured more easily. Moreover, the cyclic | annular metal cord which has moderate elongation and there is no winding looseness of a strand material can be obtained. Thereby, the breaking strength of the transmission belt can be further improved.

  Preferably, the strand material is wound five or six times along the outer peripheral surface of the annular core portion. Thereby, since the outer layer portion covers the annular core portion closely, the annular metal cord can be made geometrically stable. As a result, it is possible to reliably obtain an annular metal cord that has excellent breaking strength and can withstand deformation in the radial direction. As a result, the transmission belt also has excellent breaking strength and fatigue resistance and can withstand deformation.

  Preferably, the annular core portion and the outer layer portion are subjected to a low temperature annealing treatment. Thereby, the internal distortion of a metal strand can be removed. Therefore, the annular metal cord and thus the transmission belt can be made more difficult to break.

  Moreover, the manufacturing method of the transmission belt of this invention which can solve the said subject is provided with the cyclic | annular metal cord used as a tension body, and the coating | coated part which covers the said cyclic | annular metal cord, The said cyclic | annular metal cord is A method of manufacturing a transmission belt, comprising: an annular core portion formed in an annular shape; and an outer layer portion that is wound around the annular core portion in a spiral manner and covers an outer peripheral surface of the annular core portion, In a state in which a strand material formed by twisting a plurality of strands is wound around a predetermined annular diameter and the starting end portion or the vicinity of the starting end portion is temporarily fixed to form an annular core portion, the strand material is attached to the annular core portion. An outer layer portion covering the outer peripheral surface of the annular core portion is formed by winding a plurality of turns in a spiral shape, and then the annular metal cord is formed by joining the start end portion and the end portion of the strand material. It is characterized in that.

  In this manner, the strand material is formed by twisting a plurality of metal strands into a predetermined annular diameter and temporarily fastening the starting end portion or the vicinity of the starting end portion to form the annular core portion. A strong annular metal cord is manufactured by forming an outer layer portion that covers the outer peripheral surface of the annular core portion by winding a plurality of spirals around the outer periphery, and then joining the start and end portions of the strand material. It is possible to suppress the possibility that the annular metal cord is completely broken as compared with a case where all the strand materials are bonded together. That is, an annular core portion is formed from a strand material, and the strand material is continuously wound around the annular core portion as an axis, so that an annular metal cord having a high breaking strength can be obtained.

  Moreover, when forming the outer layer portion, the strand material constituting the annular core portion is continuously wound over a plurality of circumferences instead of winding a plurality of strand materials, so that only one strand material is required. Since the number of joints is smaller than when using a plurality, the reduction in the breaking strength of the annular metal cord can be suppressed, the manufacturing can be facilitated, and further, along the outer peripheral surface of the annular core portion, It becomes possible to wind the strand material of the outer layer portion substantially without a gap. Moreover, since the strand material of the outer layer portion is wound at a predetermined winding angle, the strand material is not disturbed and an annular metal cord having a substantially uniform surface state can be obtained. Since an external force is uniformly applied to such an annular metal cord, a decrease in breaking strength can be suppressed.

  Thus, according to the present invention, it is possible to obtain an annular metal cord that is easy to manufacture and excellent in breaking strength. Therefore, a transmission belt in which such an annular metal cord is covered with a covering portion is also less likely to break and easy to manufacture.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in breaking strength and fatigue resistance, and can provide the power transmission belt which is easy to manufacture, and its manufacturing method. Therefore, if the transmission belt of the present invention is used in an industrial machine, the industrial machine can be made excellent in durability.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  FIG. 1 is a cross-sectional perspective view of a transmission belt according to the present embodiment. The transmission belt B1 according to the present embodiment is a general industrial V-belt. The transmission belt B <b> 1 includes an annular metal cord C <b> 1 that is a strength member and a covering portion 70. The covering portion 70 covers the annular metal cord C1, and a cloth layer 72 is provided on the upper and lower surfaces of the covering portion 70. The covering portion 70 includes a material such as rubber.

  The transmission belt B1 has five annular metal cords C1. 2 is a perspective view of the annular metal cord C1, and FIG. 3 is a radial sectional perspective view showing the annular metal cord C1. FIG. 4 is a perspective view showing a state in which the strand material is wound once around the annular core portion included in the annular metal cord C1. Fig.5 (a) is sectional drawing of the radial direction which shows the cyclic | annular metal cord C1, FIG.5 (b) is a side view of the cyclic | annular metal cord C1. FIG. 6 is an enlarged perspective view showing a part of the annular metal cord C1.

  As shown in FIGS. 2 and 3, the annular metal cord C <b> 1 includes an annular core portion 3 and an outer layer portion 4 that covers the outer peripheral surface of the annular core portion 3.

  As shown in FIG. 4, the annular core portion 3 is formed by curving the strand material 1 with a predetermined diameter by one turn to make an annular shape. The outer layer portion 4 around the annular core portion 3 is formed by continuously winding the strand material 1 constituting the annular core portion 3 around the annular core portion 3 with the annular core portion 3 as an axis.

  As shown in FIG. 5A, the strand material 1 is formed by twisting a plurality of metal strands 5 together. In the present embodiment, as shown in FIG. 3, the strand material 1 is centered on one metal strand 5, and six metal strands 5 are S-twisted on the outer peripheral surface of the metal strand 5. Wrapped. Thus, since the strand material 1 is a geometrically stable seven-strand, the shape does not collapse in the process of use, and is strong and not easily broken.

  The metal strand 5 is made of high carbon steel containing 0.70% by mass or more of C as a material. By selecting a material containing 0.70% by mass or more of C, the metal element wire 5 can be made a steel wire having more excellent breaking strength.

  The diameter of the metal strand 5 is 0.06 mm or more and 0.40 mm or less. Here, since the diameter of the metal strand 5 is 0.06 mm or more, the strand material 1 has sufficient rigidity, and the annular core portion 3 can be hardly deformed. Moreover, since the diameter of the metal strand 5 is 0.40 mm or less, the rigidity of the strand material 1 does not increase moderately, and the annular metal cord C1 can be made difficult to cause fatigue fracture due to the feeding stress. In addition, the diameter of the more preferable metal strand 5 is 0.06 mm or more and 0.22 mm or less.

  That is, when the strand material 1 is formed of the metal strand 5 having such a diameter, the strand material 1 having an appropriate rigidity can be obtained, and thus the winding of the strand material 1 around the annular core portion 3 is facilitated, and The loosening of the strand material 1 is less likely to occur.

  The strand material 1 is wound around the annular core portion 3 over a plurality of circumferences, and is wound spirally as shown in FIGS. 3 and 4. The strand material 1 is wound so that there is no twist. By winding without twisting, loosening of the strand material 1 can be suppressed.

  In the present embodiment, the strand material 1 constituting the outer layer portion 4 is wound six times along the outer peripheral surface of the annular core portion 3. Since the strand material 1 wound around the annular core portion 3 is composed of one strand material 1 continuous with the annular core portion 3, the strand material 1 is wound around the outer peripheral surface of the annular core portion 3 substantially without any gap. Therefore, the outer layer portion 4 covers the annular core portion 3 densely. The cross section of the annular metal cord C1 has a shape in which six strand materials 1 are arranged around the strand material 1 that is the annular core portion 3 as shown in FIG. This cross-sectional shape is the same as the cross-sectional shape when seven strand materials 1 are twisted. Thus, since the annular metal cord C1 has a geometrically stable structure, it has excellent breaking strength and fatigue resistance and can withstand deformation in the radial direction.

  As shown in FIG. 4, the strand material 1 constituting the outer layer portion 4 is wound around the outer peripheral surface of the annular core portion 3 in a Z twist. Since the strand material 1 itself is formed by S twist, the annular metal cord C1 is a combination of the S twist structure and the Z twist structure. Therefore, the twisting direction of the metal strand 5 and the winding direction of the outer layer portion 4 with respect to the annular core portion 3 are opposite to each other, and it is possible to obtain an annular metal cord C1 that is not easily twisted and has less unevenness on the surface appearance.

  Further, the strand material 1 constituting the outer layer portion 4 is wound at a predetermined winding angle with respect to the central axis of the annular core portion 3. For this reason, the strand material 1 is wound without disturbance, and the annular metal cord C1 having a substantially uniform surface state can be obtained. In the present embodiment, as shown in FIG. 5B, the winding angle θ of the strand material 1 with respect to the X direction, that is, the direction in which the central axis of the annular core portion 3 extends is 4.5 degrees or more and 13.8 degrees. It is as follows. When the winding angle θ is set to 4.5 degrees or more, the strand material 1 is hardly loosened. By setting the winding angle θ to 13.8 degrees or less, the elongation of the strand material 1 can be prevented from becoming excessively large. That is, by setting the winding angle θ of the strand material 1 of the outer layer portion 4 wound around the annular core portion 3 to 4.5 degrees or more and 13.8 degrees or less, the annular metal cord C1 has an appropriate elongation and is supple. Can be obtained.

As shown in FIG. 6, the winding start end portion 1 a and the winding end portion 1 b of the strand material 1 constituting the annular core portion 3 and the outer layer portion 4 are connected to each other by welding, and further, the connecting portion is Covered by the connecting member 7.
The connecting member 7 is made of a highly flexible sleeve formed in the shape of a coil spring, and the connecting member 7 is an outer periphery of a joint portion between the start end 1a and the end end 1b which are both ends of the strand material 1. It is fixed with an adhesive so as to cover. The connecting member 7 formed of a coil spring-like sleeve is flexibly deformed according to the curved shape of the strand material 1 to protect and reinforce the welded portion of the strand material 1.

  Thus, the start end of the strand material 1 on the annular core portion 3 side is obtained by connecting the start end portion 1a and the end end portion 1b of the strand material 1 using the connecting member 7 formed of a coil spring-like sleeve having excellent flexibility. The joint portion between the portion 1a and the end portion 1b of the strand material 1 of the outer layer portion 4 that is inclined with respect to the start end portion 1a can be attached in a well-covered state in accordance with the shape thereof. The joint portion between the start end portion 1a and the end end portion 1b of the strand material 1 can be well protected. Further, since the connecting member 7 does not hinder the deformation of the strand material 1 in the joint portion, the flexibility of the strand material 1 in the joint portion and other portions can be made equal, and the mechanical characteristics of the annular metal cord C1 can be made all around. Can be made substantially uniform.

  In addition, the connecting portion between the start end portion 1a and the end end portion 1b is disposed on one side on both sides of the circular metal cord C1 except for the inner peripheral side and the outer peripheral side of the circular arc. Thereby, even if the cyclic | annular metal cord C1 deform | transforms in the radial direction, the load which acts on this coupling | bond part can be reduced, and the fracture | rupture in a coupling | bond part can be suppressed.

  Thus, after winding the strand material 1 which comprises the outer layer part 4 around the strand material 1 which comprises the cyclic | annular core part 3, the cyclic | annular metal cord C1 uses the connection member 7, and the start end part 1a and termination | terminus of the strand material 1 are used. It is formed by joining the part 1b.

Then, the manufacturing method of the cyclic | annular metal cord C1 is demonstrated. FIG. 7 is a perspective view showing an example of a manufacturing apparatus for manufacturing the annular metal cord C1.
The manufacturing apparatus M1 includes a driving unit 40 that rotates the annular core portion 3 in the circumferential direction, and a supply portion 50 of the strand material 1 that supplies the strand material 1 wound around the reel 51 to the winding portion of the annular core portion 3. Have.

The supply unit 50 of the strand material 1 is fixed at a predetermined position.
The driving unit 40 includes two pinch rollers 42a and 42b that are installed on an arcuate holding arm 41 and connected to a drive motor to rotate the annular core portion 3 in the circumferential direction.

  The holding arm 41 is provided with a clamp unit 43 that surrounds the periphery of the annular core portion 3 on the supply side of the strand material 1 positioned in the direction opposite to the rotation direction of the annular core portion 3. The clamp unit 43 is composed of two rollers 43a and 43b, prevents lateral vibration of the annular core portion 3, maintains stable circumferential rotation, positions the winding point of the strand material 1, and is high. Winding property is obtained. In this example, the annular core portion 3 is made vertical so as to suppress lateral vibration and rotate in the circumferential direction.

  The clamp unit 43 composed of the two rollers 43a and 43b prevents the lateral swing of the annular core portion 3, and surrounds the periphery of the annular core portion 3 even with the final finished cord diameter to maintain a stable circumferential rotation. However, as long as it has a function of fixing the winding point as a twisting port of the strand material 1, the groove shape is not particularly limited, and in addition to the U-shaped groove shape, the arc-shaped groove shape and the V-shaped groove shape may be used. Good.

The holding arm 41 is swingably installed on the stand 44 so as to perform a pendulum motion by a swing mechanism 60 including a rotary disk 61 and a crankshaft 62 with the clamp unit 43 as a fulcrum.
The annular core portion 3 held by the holding arm 41 is one end of the period of the pendulum movement, and as shown by a solid line in FIG. 8, the reel 51 is positioned outside the ring of the annular core portion 3. At the other end of the period of the pendulum motion, as shown by the solid line in FIG. 9, the swing is performed so as to be positioned in the ring of the annular core portion 3.

  In the supply unit 50 of the strand material 1, a pair of front and rear cassette stands 52 are horizontally installed at a distance that does not hinder the pendulum movement of the annular core portion 3 held by the holding arm 41. A reel delivery mechanism is provided at the tip so as to face each other across the surface of the annular core portion 3.

  The supply unit 50 includes a reel 51 around which the strand material 1 is wound, and a cassette 53 having a cylindrical outer peripheral wall having a diameter slightly larger than the outer diameter of the reel 51 and corresponding to at least the inner width of the reel. The reel 51 is rotatably accommodated in a cassette 53 so as to cover the entire winding surface of the strand material 1, and is formed into a so-called cartridge. An unwinding hole is formed in the outer peripheral wall of the cassette 53, and the strand material 1 is drawn from the unwinding hole toward the clamp unit 43 at the winding point of the annular core portion 3. The strand material 1 is wound around a reel 51 with a coil diameter adjusted in advance, and is set in a cassette 53 of the supply unit 50.

  A guide rod to which the cassette 53 can be removably mounted, and a delivery mechanism for transferring the cassette 53 mounted on one guide rod to the other guide rod, respectively, at opposite positions of the front ends of the pair of cassette stands 52. And are installed. In this delivery mechanism, the cassette 53 mounted on one guide rod can be transferred to the other guide rod by moving the rod in and out by an air cylinder and pushing the center of the cassette 53.

  When the manufacturing apparatus M1 having such a configuration is used, the annular metal cord C1 is manufactured through the following steps.

As shown in FIG. 10, the starting end side of one strand material 1 is curved in an annular shape to form an annular core portion 3.
Next, a portion where the two strand materials 1 in the vicinity of the start end portion 1a overlap is temporarily fixed by winding an adhesive tape, a string, a spring or the like.
After the temporary fixing, the annular core portion 3 is set in the driving unit 40 of the manufacturing apparatus M1, and the annular core portion 3 is rotated in the circumferential direction to start winding the strand material 1 around the annular core portion 3.

  When the annular core portion 3 is rotated in the circumferential direction and the Z winding is performed, the reel 51 of the strand material 1 is located on the left side with respect to the surface of the annular core portion 3, and the reel 51 shown by a solid line in FIG. 3 to the position where the reel 51 shown by the solid line in FIG. 9 enters the ring of the annular core part 3 from the state of being located outside the ring of the ring 3 with the clamp unit 43 as a fulcrum. 3, the reel 51 is moved at right angles to the surface of the annular core portion 3 by an air cylinder provided at the tip of the cassette stand 52, and the cassette 53 is transferred to the guide rod of the other cassette stand 52. Then, the winding is performed half a turn. Thereafter, from the state where the reel 51 indicated by the solid line in FIG. 9 is located in the ring of the annular core portion 3, the reel 51 indicated by the solid line in FIG. The annular core part 3 is moved in a pendulum manner until it comes out of the ring of the part 3, and the reel 51 is moved at right angles to the annular core surface together with the cassette 53 by the air cylinder outside the ring of the annular core part 3. And one winding is completed. By repeating such an operation, the strand material 1 serving as the outer layer portion 4 is spirally wound around the outer peripheral surface of the annular core portion 3.

  The reel 51 reciprocates back and forth across the core surface of the annular core portion 3 at a predetermined position, and the annular core portion 3 performs a pendulum motion with the clamp unit 43 serving as a winding point of the strand material 1 as a fulcrum. The distance to the winding point of the material 1 is kept substantially constant, and the strand material 1 drawn from the reel 51 does not loosen during winding, and the strand material 1 is wound around the annular core portion 3 under a constant tension. .

The movement trajectory of the reel 51 around which the strand material 1 is wound and the movement trajectory of the annular core portion 3 that performs the pendulum motion are illustrated in FIG.
That is, the reel 51 is annular from the state shown in FIG. 11A outside the annular core portion 3 to the state where the reel 51 is located in the ring of the annular core portion 3 shown in FIG. The core portion 3 is moved in a pendulum manner, and the reel 51 is transferred to the opposite surface of the annular core portion 3 shown in FIG. 11 (c) at the position shown in FIG. In a state where the reel 51 is present, the annular core portion 3 is moved in a pendulum manner from the position shown in FIG. 11C to the state where the reel 51 is located outside the ring of the annular core portion 3 shown in FIG. The cycle of returning 51 from the opposite surface of the annular core portion 3 to the starting position of the original surface (position (a) in FIG. 11) is repeated. As described above, in the present embodiment, the annular core portion 3 is moved by the pendulum with respect to the reel 51 as shown in (a) → (b) → (c) → (d) → (a) in FIG. As shown in (b) → (c) and (d) → (a) of FIG. 11, the strand 51 is moved at right angles with respect to the core surface of the annular core portion 3, whereby the strand material 1 is removed from the annular core portion 3. It is wound around the periphery in a spiral.

  After the winding of the strand material 1 is completed, the winding terminal portion 1b of the strand material 1 is inserted into the connecting member 7, and the temporary fixing in the vicinity of the starting end portion 1a is removed, and the starting end portion 1a and the terminal end portion 1b are welded and joined. Next, an adhesive is applied to the joint portion between the start end portion 1a and the terminal end portion 1b, and the connecting member 7 is slid to a position covering the joint portion. If it does in this way, as FIG. 6 shows, the connection member 7 will be fixed to a coupling | bond part by an adhesive agent, a coupling | bond part will be protected by the connection member 7, and the fracture | rupture in a coupling | bond part will be suppressed.

Here, in the strand material 1, since the end portion on the outer peripheral layer 4 side is inclined with respect to the start end portion 1 a on the annular core portion 3 side, the connecting portion is slightly curved, but the connecting member 7 is formed of a coil spring-like sleeve. Since it is excellent in flexibility, the connecting member 7 can be easily attached to the coupling portion.
Then, as described above, the outer layer portion 4 can be provided around the annular core portion 3 by winding the strand material 1 around the annular core portion 3 and joining the start end portion 1a and the end portion 1b.

After the start end portion 1a and the end portion 1b are joined, the above-described annular core portion 3 and outer layer portion 4 may be subjected to a low temperature annealing treatment. More specifically, heat treatment is performed on the annular core portion 3 and the outer layer portion 4 in a pressure chamber in which argon is introduced in a vacuum or a reduced-pressure atmosphere. The temperature during the heat treatment is 70 ° C to 380 ° C. Thereby, the internal distortion of the metal strand 5 can be removed, and the cyclic | annular metal cord C1 without a distortion can be obtained. When such an annular metal cord C1 is used for a transmission belt, a transmission belt that rotates without meandering can be obtained. Since the transmission belt rotating without meandering does not wear due to contact with surrounding parts, it can maintain high performance over a long period of time.
In addition, it is good to perform a low temperature annealing process before apply | coating the adhesive agent for adhere | attaching the connection member 7 to the coupling | bond part of the start part 1a and the termination | terminus part 1b.

  As described above, the transmission belt B1 of the present embodiment has the annular metal cord C1 as a strength member. The annular metal cord C1 is wound around the annular core portion 3 and a plurality of spirally around the annular core portion 3 by a strand material 1 formed by twisting seven metal strands 5, and the outer periphery of the annular core portion 3 Since the outer layer portion 4 that covers the surface is formed and the annular core portion 3 and the outer layer portion 4 are formed of the continuous strand material 1, the annular metal cord C1 can be made strong, as in the past. Compared with the case where a plurality of strand materials are joined together at one place in the circumferential direction, the possibility that the annular metal cord C1 is completely broken can be avoided. That is, since the annular core portion 3 is formed from the strand material 1 and the strand material 1 is continuously wound around the annular core portion 3 as an axial core, an annular metal cord having a high breaking strength can be obtained. Furthermore, since the external force applied to the annular metal cord C1 can be received by the continuous annular core portion 3 and the outer layer portion 4, the applied external force is dispersed throughout the annular metal cord C1 and the load is concentrated locally. Can be avoided.

  Moreover, when the outer layer portion 4 is formed, the strand material 1 constituting the annular core portion 3 is continuously wound over 6 laps instead of winding a plurality of strand materials 1, so that only one strand material 1 is required, Therefore, since the number of joints is reduced as compared with the case where a plurality of strand materials 1 are used, a reduction in the breaking strength of the annular metal cord C1 can be suppressed, and the manufacturing can be facilitated. Moreover, since the strand material 1 of the outer layer part 4 is wound at a predetermined winding angle, the strand material 1 is not disturbed and an annular metal cord C1 having a substantially uniform surface state can be obtained. Since an external force is uniformly applied to such an annular metal cord C1, a decrease in breaking strength can be further suppressed.

  In addition, the start end portion 2 a and the end end portion 2 b of the strand material 1 are combined using a connection member 7, and the connection portion is protected by the connection member 7. In this case, the joined portion of the strand material 1 is more difficult to break. Further, since the connecting member 7 is formed of a coil spring-like sleeve, it is possible to facilitate the mounting, and therefore, the start end portion 2a and the end end portion 2b of the strand material 1 can be easily coupled.

  Moreover, the diameter of the metal strand 5 is 0.06 mm or more and 0.40 mm or less, or 0.06 mm or more and 0.22 mm or less. In this case, the strand material 1 can have appropriate rigidity, and the strand material 1 Can have good fatigue resistance.

  Moreover, the annular core part 3 and the outer layer part 4 are formed from one continuous strand material 1. In this case, the strand material 1 of the outer layer portion 4 can be wound substantially without any gap along the outer peripheral surface of the annular core portion 3.

  The strand material 1 is obtained by S-twisting the metal strand 5, but the winding of the strand material 1 that becomes the outer layer portion 4 around the annular core portion 3 is Z-twisted. In this case, it is possible to obtain an annular metal cord C1 that has less irregularities on the surface appearance, is less likely to twist, and is less likely to loosen the strand material 1 of the outer layer portion 4 with respect to the annular core portion 3.

  Moreover, the winding angle of the strand material 1 with respect to the central axis of the annular core part 3 is 4.5 degrees or more and 13.8 degrees or less. In this case, the winding work of the strand material 1 becomes easy. Moreover, the cyclic | annular metal cord C1 which has moderate elongation and there is no winding looseness of the strand material 1 can be obtained.

  Further, the strand material 1 that becomes the outer layer portion 4 is wound around the outer peripheral surface of the annular core portion 6 for six turns. Thereby, since the outer layer part 4 covers the annular core part 3 densely, the annular metal cord C1 can be made geometrically stable. As a result, it is possible to reliably obtain an annular metal cord C1 that is excellent in breaking strength and fatigue resistance and can withstand deformation in the radial direction.

  Further, the annular core portion 3 and the outer layer portion 4 are subjected to a low temperature annealing treatment. In this case, the internal distortion of the metal strand 5 can be removed. By using the metal strand 5 from which the internal strain has been removed, it is possible to reliably obtain the annular metal cord C1 that is more difficult to break.

  As described above, since the annular metal cord C1 that is excellent in breaking strength and fatigue resistance and easy to manufacture is used, the transmission belt B1 is also excellent in breaking strength and fatigue resistance and easy to manufacture. .

  The present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, when the annular core portion 3 is formed, an extra length portion is formed on one end side of the strand material 1 and temporarily fixed, so that the extra length portion constitutes a part of the outer layer portion 4. good.

  Further, for example, in the annular metal cord C1 of the transmission belt B1 of the present embodiment, the strand material 1 is wound six times along the outer peripheral surface of the annular core portion 3, and the outer layer portion 4 is formed. It is good. Alternatively, a loop for one round is formed with the strand material 1 and then wound around the circumference for two rounds to form the annular core portion 3 wound with the strand material 1 for three turns, and then the winding direction is reversed. Then, the winding may be continued from 7 to 9 turns.

  Further, in the annular metal cord C1 of the transmission belt B1 of the present embodiment, as shown in FIG. 5A, the outer peripheral surface of the annular core portion 3 is covered with one layer of the strand material 1. Alternatively, a plurality of layers of the strand material 1 may cover the outer peripheral surface of the annular core portion 3. For example, when the outer peripheral surface of the annular core portion 3 is covered with two layers of the strand material 1, the strand material 1 is wound around the outer peripheral surface of the annular core portion 3 to form the first layer, and then the first layer is formed. The second layer is formed by winding 12 strands of the strand material 1 around the outer peripheral surface. The winding direction of 12 turns corresponding to the second layer is preferably opposite to the winding direction of 6 turns corresponding to the first layer. Setting such a winding direction is important in obtaining good winding properties and obtaining an outer surface with less unevenness.

  Further, in the annular metal cord C1 of the transmission belt B1 of the present embodiment, the strand material 1 is S-twisted, and the strand material 1 of the outer layer portion 4 is wound around the annular core portion 3 by Z-twisting. May be Z-twisted, and the strand material 1 of the outer layer portion 4 may be wound around the annular core portion 3 by S-twisting.

  Further, as shown in FIG. 5A, the annular metal cord C1 of the present embodiment has a substantially circular cross section, but the cross section may have a flat shape. In this case, the substantially circular annular metal cord C1 is deformed by pressing or the like.

  Further, the transmission belt B1 of the present embodiment has five annular metal cords C1, but the number of the annular metal cords C1 is not limited to this. The number of the annular metal cords C1 can be adjusted according to the required bending resistance and durability.

  Moreover, the kind of transmission belt is not restricted to the general industrial V belt. FIG. 12 is a cross-sectional perspective view showing another modification of the transmission belt. The transmission belt B2 shown in FIG. 12 is a toothed timing belt, and is formed by covering the annular metal cord C1 with a covering member 80 using a tensile strength member. The covering portion 80 includes a material such as rubber. Such a transmission belt B2 is also excellent in breaking strength and fatigue resistance.

  Moreover, the material of the metal strand 5 is not restricted to the above.

It is a section perspective view of the power transmission belt concerning this embodiment. It is a perspective view of an annular metal cord. It is a cross-sectional perspective view of the radial direction which shows a cyclic | annular metal cord. It is a perspective view which shows a mode that the strand material was wound 1 round around the cyclic | annular core part contained in a cyclic | annular metal cord. (A) is sectional drawing of the radial direction which shows a cyclic | annular metal cord, (b) is a side view of a cyclic | annular metal cord. It is an expansion perspective view which shows a part of cyclic | annular metal cord. It is a perspective view which shows an example of the manufacturing apparatus for manufacturing a cyclic | annular metal cord. The state where the reel is located outside the ring of the annular core part at one end of the period of the pendulum movement of the annular core part is indicated by a solid line, and the reel is located inside the ring of the annular core part at the other end of the period of the pendulum movement of the annular core part. It is the front view of the apparatus of FIG. 7 which showed the state located in a chain line. Contrary to FIG. 8, the state where the reel is positioned in the ring of the annular core portion at one end of the cycle of the pendulum motion of the annular core portion is indicated by a solid line, and the reel is at the other end of the cycle of the pendulum motion of the annular core portion. It is the front view of the apparatus of FIG. 7 which showed the state located outside the ring | wheel of an annular core part with the dashed line. It is a conceptual diagram at the time of forming the cyclic | annular core part of a cyclic | annular metal cord. It is a conceptual diagram when the movement state of the reel at the time of manufacturing a cyclic | annular metal cord is seen from the upper surface. It is a cross-sectional perspective view which shows the other modification of a power transmission belt.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Strand material, 1a ... Start part, 1b ... Termination part, 3 ... Annular core part, 4 ... Outer layer part, 5 ... Metal wire, 7 ... Connection member, 70, 80 ... Cover part, B1, B2 ... Transmission belt , C1 ... annular metal cord.

Claims (13)

An annular metal cord serving as a tensile body, and a covering portion that covers the annular metal cord, the annular metal cord,
An annular core portion formed in a ring shape by a strand material formed by twisting a plurality of metal strands, and an outer layer portion wound around the annular core portion in a spiral manner and covering the outer peripheral surface of the annular core portion , And
The transmission belt, wherein the annular core portion and the outer layer portion are formed of a continuous strand material. The transmission belt according to claim 1,
The transmission belt, wherein the annular core portion and the outer layer portion are formed by one strand material, and both end portions of the strand material are joined to each other. The transmission belt according to claim 1 or 2,
One of the end portions of the strand material is a starting end portion that forms the annular core portion, and the other end portion of the strand material is a terminal end portion that forms the outer layer portion. The transmission belt according to claim 1 or 2,
One end portion of the strand material is an extra length portion when the annular core portion is formed, and the extra length portion constitutes a part of the outer layer portion. The transmission belt according to any one of claims 1 to 4,
Ends of the strand material are joined together using a connection member, The power transmission belt characterized by things. The transmission belt according to claim 5,
An end portion of the strand material is joined to each other by welding, and the joined portion is covered and bonded by the connecting member made of a coil spring-like sleeve. The transmission belt according to any one of claims 1 to 6,
The transmission belt according to claim 1, wherein a diameter of the metal strand is 0.06 mm or more and 0.40 mm or less. The transmission belt according to any one of claims 1 to 6,
The transmission belt according to claim 1, wherein a diameter of the metal element wire is 0.06 mm or more and 0.22 mm or less. The transmission belt according to any one of claims 1 to 8,
The power transmission belt according to claim 1, wherein a twist direction of the metal element wire and a winding direction of the outer layer portion with respect to the annular core portion are opposite. The transmission belt according to any one of claims 1 to 9,
The transmission belt, wherein a winding angle of the strand material with respect to a central axis of the annular core portion is 4.5 degrees or more and 13.8 degrees or less. A transmission belt according to any one of claims 1 to 10,
The transmission belt, wherein the strand material is wound five or six times along the outer peripheral surface of the annular core portion. The transmission belt according to any one of claims 1 to 11,
The transmission belt, wherein the annular core portion and the outer layer portion are subjected to a low temperature annealing treatment. An annular metal cord serving as a tensile body, and a covering portion that covers the annular metal cord, the annular metal cord being annularly formed, and a plurality of spiral windings around the annular core portion And an outer layer portion covering the outer peripheral surface of the annular core portion,
In a state in which a strand material formed by twisting a plurality of metal strands is wound around a predetermined annular diameter and the starting end portion or the vicinity of the starting end portion is temporarily fixed to form an annular core portion, the strand material is attached to the annular core portion. Forming an outer layer part covering the outer peripheral surface of the annular core part by winding a plurality of spirals around the circumference, and then forming the annular metal cord by joining the start and end parts of the strand material. A method for manufacturing a transmission belt, which is characterized.

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