KR20090073999A - Annular metal cord, endless metal belt, and method of producing annular metal cord - Google Patents

Abstract

Provided are an annular metal cord having high breaking strength and capable of being easily produced, an endless metal belt, and a method of producing an annular metal cord. The annular metal cord (C1) is formed by annular core section (3) and an outer layer section (4) multiply helically wrapped around the annular core section (3) and covering the outer periphery of the annular core section (3). The annular core section (3) is formed in an annular shape by first and second strand members (1, 2) formed by twisting multiple metal wires (5, 6) together. An adhesion material for coating is applied and solidified around the annular metal cord(C1) to cover its periphery by an outer layer coating (10) formed from the elastic coating material.

Description

Method of manufacturing annular metal cord, endless metal belt and annular metal cord {ANNULAR METAL CORD, ENDLESS METAL BELT, AND METHOD OF PRODUCING ANNULAR METAL CORD}

TECHNICAL FIELD This invention relates to an annular metal cord, an endless metal belt, and the manufacturing method of an annular metal cord.

Background Art [0002] Conventionally, as a type of endless metal belt, as described in, for example, Patent Document 1, a cross section manufactured by bending a rolled material to be welded at both ends to cut a cylindrical shape to a predetermined width. This rectangular shape is known.

In addition, as described in, for example, Patent Document 2, an endless belt using a metal cord as a core material is known. The metal cord used as a core material is equipped with the at least 1 filament used as a center core, and the some filament which wound the center core.

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2003-236610

[Patent Document 2] Japanese Patent Application Laid-Open No. 4-307146

1 is a perspective view of an annular metal cord according to a first embodiment of the present invention.

Fig. 2 is a perspective view before carrying out outer layer coating of the cyclic metal cord according to the first embodiment.

3 is a sectional perspective view in the radial direction showing the annular metal cord according to the first embodiment.

4 is a perspective view showing a form in which a second strand member is wound once in an annular core portion included in the annular cord according to the first embodiment.

Fig. 5A is a sectional view in the radial direction showing the annular metal cord according to the first embodiment, and Fig. 5B is a side view of the annular metal cord.

6 is an enlarged perspective view showing a part of the annular metal cord according to the first embodiment.

7 is a perspective view showing an example of a manufacturing apparatus for producing an annular metal cord.

Fig. 8 shows the state in which the reel is located outside the edge of the annular core portion at one end of the period of pendulum motion of the annular core part, and the reel is annular at the other end of the period of pendulum motion of the annular core part. It is a front view of the apparatus of FIG. 7 which shows the state located in the edge of a core part by the dashed line.

Fig. 9 shows a state in which the reel is located within the rim of the annular core portion at one end of the cycle of the pendulum movement of the annular core portion, as opposed to Fig. 8, and the reel is the edge of the annular core portion at the other end of the cycle of the pendulum movement of the annular core portion. It is a front view of the apparatus of FIG. 7 which shows the state located outside by the broken line.

10 is a front view of the annular core portion constituting the annular metal cord C1.

Fig. 11 is a conceptual diagram when the reel moving state in manufacturing the annular metal cord is viewed from the top.

12 (a) to 12 (e) are cross-sectional views showing another embodiment of the uncoated portion.

Fig. 13 is a perspective view showing a state of use of the endless metal belt.

14 is a perspective view of an annular metal cord according to a second embodiment of the present invention.

Fig. 15 is a perspective view before carrying out outer layer coating of the cyclic metal cord according to the second embodiment.

Fig. 16 is a sectional perspective view in the radial direction showing the annular metal cord according to the second embodiment.

FIG. 17 is a perspective view showing a form in which strand material is wound once on an annular core portion included in the annular metal cord according to the second embodiment. FIG.

 Fig. 18A is a sectional view in the radial direction showing the annular metal cord according to the second embodiment, and Fig. 18B is a side view of the annular metal cord.

19 is an enlarged perspective view showing a part of the annular metal cord according to the second embodiment.

20 is a conceptual view when forming the annular core portion of the annular metal cord according to the second embodiment.

Fig. 21 is a perspective view of the annular metal cord according to the third and fourth embodiments of the present invention.

(Explanation of symbols for the main parts of the drawing)

1: first strand material

2: second strand ash

3, 13: annular core portion

4, 14: outer layer

5, 6, 15: metal wire

10: outer layer coating (coating part)

10A: non-coated

11: strand ash

B1: stepless metal belt

C1, C2, C3, C4: annular metal cord

(Initiation of invention)

(Tasks to solve the invention)

Since the endless metal belt of patent document 1 has a rectangular cross section, it is weak to torsion, and break is easy to occur. In addition, when applying the metal cord of patent document 2 to an endless metal belt, it is necessary to combine the both ends of a metal cord, and to make it annular. As a method of joining both ends of a metal cord, the method of joining the both ends of a metal cord to each other, and the method of joining both ends respectively for every filament which comprises a metal cord are considered. In the method of joining the opposite ends of the metal cords to each other, the coupling portion is concentrated at one location in the circumferential direction, so that complete breakage of the metal cord is likely to occur. On the other hand, in the method of joining both ends of each filament, the end portions of the filaments are untwisted and joined, and after joining, the ends of the filaments must be twisted with each other again. There is a fear that the mechanical strength of the coupling portion may decrease. As a result, breakage of the metal cord easily occurs. Moreover, in the method of joining both ends of each filament, the process by joining becomes complicated, and manufacture becomes difficult.

It is therefore an object of the present invention to provide a cyclic metal cord, an endless metal belt, and a method for producing a cyclic metal cord, in which breakage is unlikely to occur and is easy to manufacture.

(Means to solve the task)

The annular metal cord according to the present invention, which can solve the above-mentioned problems, includes an annular core portion formed in an annular form by strand material formed by twisting a plurality of metal filaments with each other, and the annular core portion. A cyclic metal cord having an outer layer portion wound in a spiral shape and covering the outer circumferential surface of the annular core portion, wherein at least a portion of the outer layer portion is covered by an outer layer coating made of an elastic coating material.

Thus, since at least one part of an outer layer part is covered by the outer layer coating which consists of a coating material which has elasticity, a cyclic metal cord can be made into the strong thing which was excellent in breaking strength and fatigue resistance. In addition, the problem that the strands are loosened by the outer layer coating can be eliminated, and the outer layer coating becomes a cushioning material, so that the outer layer coating is also annular by the outer layer coating, for example, at a contact point with a pulley or the like bent at a small radius of curvature. Since the frictional resistance with the member on the opposite side that the metal cord is in contact with is increased, slippage can be suppressed to eliminate wear as much as possible and good power transmission efficiency can be obtained.

Preferably, at least the periphery of the outer layer, including the joining portion between the winding start end and the winding terminal end, is covered by the outer layer covering. Thereby, the joint part of the winding start end part and the winding end part of an outer layer part can be firmly reinforced, and also the problem that the metal wire which comprises a strand material is loosened can be eliminated.

Preferably, at least one non-coating portion is provided on the annular outer circumferential side of the outer layer coating. As a result, the lubricant can be smoothly penetrated from the uncovered portion, and between the annular core portion and the outer layer portion, between the strands constituting the outer layer portion, and between the metal wires constituting each strand material. The reduction in strength due to fretting wear and the shortening of life due to fatigue can be suppressed.

Preferably, the non-coated portion that covers the entire circumference of the annular direction in the outer layer covering is formed in at least one of the circumferential directions in the cross section. As a result, by forming the uncoated portion over the entire circumference, the lubricant can be smoothly infiltrated from the uncoated portion to the inside, and the strength due to the fretting wear between the individual metal wires and the life due to the fatigue While suppressing the shortening, the uniformity of rigidity over the entire circumference can be achieved.

Preferably, the annular outer circumferential side of the outer layer coating is an uncovered portion over the entire circumference of the annular direction. That is, the outer layer coating is formed only on the inner circumferential side of the annulus. Thereby, strand material can be integrated, restraining the increase of rigidity by forming an outer layer coating as much as possible.

Preferably, it has an at least 1 uncovered part, whereas the annular inner peripheral side in the said outer layer coating | cover is. Accordingly, the lubricant can be smoothly penetrated into the interior from the uncoated portion on the other side of the annular inner circumferential side.

Preferably, over the entire circumferential surface and the entire length of the outer layer portion, the covering portion covered with the outer layer covering and the uncovered portion without the outer layer covering are alternately formed. As a result, the lubricant can be smoothly penetrated from the exposed part, which is the uncovered part, to the inside, and between the annular core part and the outer layer part, between the strands constituting the outer layer part, and between the metal wires constituting each strand material. It is possible to suppress the decrease in strength due to friction and the shortening of life due to fatigue.

Preferably, the covering portion is longer than the uncovered portion. In other words, the uncoated portion can be made as long as possible to minimize the coating portion as the minimum length necessary for the lubricant to penetrate into the inside, and the reinforcing effect can be enhanced, and the life can be extended.

Preferably, the said uncovered part is provided in at least 1 place in the annular direction of the said outer layer part. Thereby, a lubricant can penetrate inside from the uncoated part formed in at least 1 place of an cyclic direction. In addition, the number of uncoated coatings can be reduced as much as possible, the reinforcing effect according to the outer layer coating can be enhanced, and long life can be achieved.

Preferably, the adhesive solidification part which hardened the coating adhesive and the non-adhesion solidification part without a coating adhesive are formed in the outer peripheral surface of the said annular core part alternately. Thereby, the annular core part itself can be reinforced by an adhesive solidification part, and the intensity | strength of a cyclic metal cord can be raised. In addition, since the non-bonded solidified portion is formed, the lubricant can smoothly penetrate into the annular core portion from the non-bonded solidified portion, and the friction between the individual metal wires constituting the strand material to be the annular core portion is prevented. It is possible to suppress the decrease in strength and the shortening of life due to fatigue.

Preferably, the said uncovered part without the said outer layer coating in the said outer layer part, and the non-adhesive solidification part without the adhesive agent for coating in the said annular core part are arrange | positioned in another position in an annular direction. As described above, since the positions of the uncoated portion and the non-bonded solidified portion deviate in the annular direction, a decrease in the reinforcing effect due to the formation of these uncoated portions and the non-bonded solidified portions can be suppressed to the maximum.

Preferably, at least one of the coating adhesive and the outer layer coating has a hardness (JIS-A) of 22 to 60 and an elongation ratio of 110 to 500% in physical properties after the solidification. Thus, by using the coating adhesive and outer layer coating whose hardness (JIS-A) is 22-60 and elongation rate 110-500%, high reinforcement effect can be acquired, ensuring flexibility and suitable elongation rate.

Preferably, the outer layer coating is made of rubber. Thereby, by providing an outer layer coating in predetermined | prescribed location with rubber | gum, it can reinforce easily. Moreover, since the frictional resistance with the member of the counterpart which a cyclic | annular metal cord contacts is made large by the outer layer coating which consists of rubber | gum, it can be set as what is suitable for using as a power transmission belt.

Preferably, the rubber constituting the outer layer coating is adhered to the outer layer portion by a metal rubber adhesive for bonding the metal and the rubber. Thereby, rubber and the strand material of an outer layer part can be reliably adhered, and a reinforcement effect can be improved.

Preferably, the rubber constituting the outer layer coating is vulcanized at a vulcanization pressure of 8 MPa or less. As a result, the intrusion of the rubber into the annular metal cord can be suppressed and the lubricant can be satisfactorily infiltrated, and the strand material constituting the outer layer portion between the annular core portion and the outer layer portion, and constitutes each strand ash. The reduction in strength due to fretting wear and the shortening of life due to fatigue can be suppressed between the metal wires.

However, when a cyclic metal cord is used in the environment which does not use a lubricant, it is more preferable to set it as the vulcanization pressure which a rubber | gum penetrates actively into the cyclic metal cord inside.

Moreover, the endless metal belt which concerns on this invention which can solve the said subject is characterized by including the cyclic metal cord which concerns on the said invention. By using the above-described cyclic metal cord, an endless metal belt excellent in breaking strength and fatigue resistance and easy to manufacture can be obtained.

Moreover, in the manufacturing method of the said cyclic metal cord which can solve the said subject, a masking tape is adhere | attached on the location which does not form the said outer layer coating of the said cyclic metal cord, and it coat | covers on the outer peripheral surface of the said cyclic metal cord An adhesive is applied, and the masking tape is removed after the coating adhesive is solidified.

Thus, by attaching a masking tape to the place which does not form the outer layer coating in a cyclic metal cord, apply | coating the adhesive agent for coating to the outer peripheral surface of a cyclic metal cord, and removing this masking tape after solidification of this coating adhesive agent, It is covered by an outer layer coating made of a coating adhesive, which is strong, and there is no problem of loosening the strand ash, and it is possible to easily manufacture a cyclic metal cord having a smooth penetration of lubricant.

Moreover, in the manufacturing method of the said cyclic metal cord which can solve the said subject, a masking tape is adhere | attached on the location which does not form the said outer layer coating of the said cyclic metal cord, and a raw rubber is made to the outer peripheral surface of the said cyclic metal cord. The masking tape is removed after being bonded and subjected to pressure vulcanization.

Thus, a masking tape is adhered to the place which does not form the outer layer coating in a cyclic metal cord, a raw rubber is adhere | attached on the outer peripheral surface of a cyclic metal cord, and it removes the said masking tape after pressure vulcanizing process, and consists of rubber | gum. The cyclic metal cord covered by the outer layer film, which is strong and does not have a problem of unwinding the strand ash, and has a smooth penetration of lubricant, can be easily manufactured.

(Effects of the Invention)

According to the present invention, it is possible to provide a cyclic metal cord, an endless metal belt, and a method for producing a cyclic metal cord, which are excellent in breaking strength and fatigue resistance and are easy to manufacture. Therefore, when the cyclic metal cord and the endless metal belt of this invention are used for industrial machines, the said industrial machines can be made excellent in durability.

(The best form to carry out invention)

EMBODIMENT OF THE INVENTION Hereinafter, with reference to an accompanying drawing, the preferred embodiment of this invention is described in detail. In addition, in description, the same code | symbol is used for the same element or the element which has the same function, and the overlapping description is abbreviate | omitted.

(1st embodiment)

The annular metal cord according to the first embodiment will be described with reference to the drawings. Fig. 1 is a perspective view of the annular metal cord according to the first embodiment, Fig. 2 is a perspective view before carrying out outer layer coating of the annular metal cord according to the first embodiment, and Fig. 3 is according to the first embodiment. It is a sectional perspective view of the radial direction which showed the cyclic metal cord, and FIG. 4 is a perspective view which showed the form which wound the 2nd strand material once in the cyclic core part with which the cyclic metal cord which concerns on 1st Embodiment is equipped. FIG. 5 (a) is a cross-sectional view in the radial direction showing the annular metal cord according to the first embodiment, and FIG. 5 (b) is a side view of the annular metal cord according to the first embodiment. 6 is an enlarged perspective view showing a part of the annular metal cord according to the first embodiment.

As shown in FIG. 1, the outer circumferential side of the annular metal cord C1 is covered with the outer layer coating 10. This outer layer coating 10 is formed by carrying out adhesive solidification of the coating adhesive which is an elastic coating material.

And this cyclic metal cord C1 has the uncovered part 10A which the outer layer coating 10 is not performed. This uncoated portion 10A is formed in a slit shape over the entire circumference of the annular direction, while the annular outer circumferential side in the outer layer covering 10 is formed.

As the coating adhesive for forming the outer layer coating 10, an adhesive having, for example, a silicone rubber-based elasticity having excellent heat resistance and oil resistance is used, and the hardness in physical properties after the solidification (JIS-A) is used. Is 22 to 60 and the elongation is 110 to 500%. For example, three bond 1222B (manufactured by TreeBond), which is a silicone adhesive sealing agent, may be used as the adhesive for coating the outer layer coating 10. It has heat resistance, cold resistance, weather resistance, durability, and abrasion resistance, and is a quick-drying and quick-hardening sealing compound, and is very suitable as the outer layer coating 10. In addition, the hardness (JIS-A) of the three bond 1222B is 27, and the elongation is 450%.

2 and 3, the annular metal cord C1 includes an annular core portion 3 and an outer layer portion 4 covering the outer circumferential surface of the annular core portion 3.

The annular core portion 3 is formed by joining both ends of the first strand member 1. Therefore, the annular core part 3 has the engaging part 3a, as shown in FIG. In the first embodiment, both ends of the first strand member 1 are joined by welding. In the case of joining by welding, it is difficult to increase the diameter of the joining portion as compared with the case of joining by other methods. Therefore, the annular core part 3 with which winding of the 2nd strand material 2 is smooth also in the engagement part can be obtained.

As shown in Fig. 5 (a), the first strand member 1 twists a plurality of first metal wires 5 together. In 1st Embodiment, as shown in FIG. 3, the 1st strand material 1 is made into six at the outer peripheral surface of this 1st metal strand 5 with the center of one 1st metal strand 5. The first metal wire 5 is wound by S twisting. Thus, since the 1st strand material 1 is seven twisted geometrically stable, it becomes strong and it is hard to produce a fracture.

The first metal wire 5 is an alloy steel, and contains, as a material, C: 0.08 to 0.27 mass%, Si: 0.30 to 2.00 mass%, Mn: 0.50 to 2.00 mass%, and Cr: 0.20 to 2.00 mass%. At least one of Mo: 0.01 to 1.00% by mass, Ni: 0.10 to 2.00% by mass, Co: 0.10 to 2.00% by mass, and W: 0.01 to 1.00% by mass is contained. At least one of Al, Nb, Ti, and V is contained in the range of 0.001 to 0.10% by mass, respectively, and the balance is made of Fe and inevitable impurities. Since the 1st metal element 5 which consists of such a material is used for the 1st strand material 1, the 1st strand material 1 is good in weldability and excellent in heat resistance. In addition, the material of the 1st metal element wire 5 is not limited to what was mentioned above.

The first metal element 5 has a diameter of 0.06 to 0.40 mm. Since the diameter of the first metal element 5 is larger than 0.06 mm, the first strand member 1 can be provided with an appropriate rigidity and the fatigue resistance can be improved. In addition, since the 1st strand material 1 which forms the annular core part 3 is located in the cross-sectional center of the cyclic metal cord C1, the 2nd strand material 2 in the state which bent the cyclic metal cord C1 is bent. ), The stress is small. Therefore, rigidity can be improved by making the diameter of the 1st metal element wire 5 larger than the 2nd metal element wire 6 within the range of 0.06-0.40 mm. In addition, since the diameter of the first metal element 5 is smaller than 0.40 mm, the rigidity of the first strand member 1 does not become excessively large, and fatigue fracture of the annular metal cord C1 due to cyclic stress is unlikely to occur. can do.

The outer layer portion 4 is formed by winding the second strand material 2 with the annular core portion 3 as the axial core. As shown in Fig. 5 (a), the second strand material 2 twists a plurality of second metal wires 6 together.

The second metal element wire 6 uses high carbon steel containing 0.60% by mass or more of C as the material. By selecting the material containing C or more than 0.60 mass%, the 2nd metal element wire 6 can be made into the steel wire which was more excellent in breaking strength. The second metal element wire 6 may be made of the same material as the first metal element wire 5, but the second metal element wire 6, which is not welded and bonded, contains 0.60% by mass or more of C. It is more preferable to use. In addition, the material of the 2nd metal element 6 is not limited to what was mentioned above.

The diameter of the second metal wire 6 has a diameter of 0.06 to 0.30 mm. As a result, the second strand material 2 can be provided with an appropriate rigidity and the fatigue resistance can be improved. Therefore, the winding of the second strand material 2 to the annular core portion 3 becomes easy, and the loose winding of the second strand material 2 is unlikely to occur. Moreover, More preferably, the diameter of the 2nd metal element wire 6 is 0.06-0.22 mm.

In the first embodiment, as shown in FIG. 3, the second strand material 2 is wound by S twisted six second metal wires 6 on the outer circumferential surface of the second metal wires 6. will be. That is, since the 2nd strand material 2 is seven twists which are geometrically stable, it becomes strong, and it is hard to be broken.

The second strand material 2 is wound around the annular core portion 3 in a plurality of times, and is wound in a spiral shape as shown in FIGS. 3 and 4. The second strand ash 2 is wound so that there is no twisting. By winding without twisting, the loose winding of the second strand material 2 can be suppressed.

In the first embodiment, the second strand material 2 is wound six times along the outer circumferential surface of the annular core portion 3. Since the second strand member 2 has a diameter substantially the same as the annular core portion 3 formed by the first strand member 1, the second strand member 2 is formed on the outer circumferential surface of the annular core portion 3. Is wound up substantially without gaps. Thus, the outer layer portion 4 densely covers the annular core portion 3. The cross section of the annular cord C1 has a shape in which six second strand ashes 2 are arranged around the first strand ash 1, which is the annular core portion 3, as shown in FIG. 5A. do. This cross-sectional shape is the same as the cross-sectional shape at the time of twisting seven 1st strand material 1 or the 2nd strand material 2. Thus, since the cyclic metal cord C1 has a geometrically stable structure, it is excellent in breaking strength and fatigue resistance, and can endure the deformation of a radial direction.

As shown in Fig. 4, the second strand material 2 is wound around the outer circumferential surface of the annular core portion 3 by Z twist. Since the 1st strand material 1 and the 2nd strand material 2 itself are formed by S twist, the cyclic metal cord C1 becomes S twist and Z twist mixed. Therefore, the annular metal cord C1 which is hard to be twisted and has little unevenness in the surface appearance can be obtained.

In addition, the second strand material 2 is wound at a predetermined winding angle with respect to the central axis of the annular core portion 3. For this reason, the 2nd strand material 2 is wound up undisturbed, and the cyclic metal cord C1 of a substantially uniform surface state can be obtained. In the first embodiment, as shown in Fig. 5 (b), the winding angle θ of the second strand member 2 with respect to the X direction, that is, the direction in which the central axis of the annular core portion 3 extends, It is 4.5 to 13.8 degrees. When the winding angle θ is made larger than 4.5 degrees, loose winding of the second strand material 2 is unlikely to occur. By making the winding angle θ smaller than 13.8 degrees, the elongation rate of the second strand material 2 can be prevented from becoming excessively large. That is, by setting the winding angle θ of the second strand material 2 to 4.5 to 13.8 degrees, the annular metal cord C1 having an appropriate elongation and easy to bend can be obtained. When such an annular metal cord C1 is used for the endless metal belt of the continuously variable transmission mentioned later, for example, power transmission between a drive side pulley and a driven side pulley can be performed precisely.

As shown in Fig. 6, the winding start end 2a and the winding end 2b of the second strand 2 are joined to each other by welding.

And the part containing the junction part 7 of the winding start end 2a and the winding end part 2b of this 2nd strand material 2 is covered with the outer layer coating 10. As shown in FIG.

As described above, the outer layer part 4 winds the winding start end 2a and the winding termination part 2b of the second strand material 2 after the second strand material 2 is wound on the annular core part 3. It is formed by welding.

Subsequently, the manufacturing method of the cyclic metal cord C1 is demonstrated. 7 is a perspective view showing an example of a manufacturing apparatus for manufacturing the annular metal cord C1.

This manufacturing apparatus M1 winds the driving unit 40 which rotates the annular core part 3 to the circumferential direction, and the 2nd strand material 2 wound by the reel 51 by the annular core part 3. It has a supply unit 50 of the 2nd strand material 2 supplied to a part.

The supply portion 50 of the second strand material 2 is fixed at a predetermined position.

The driving unit 40 has two pinch rollers 42a and 42b which are provided on the bow-shaped support arm 41 to rotate the annular core portion 3 connected to the drive motor in the circumferential direction.

The support arm 41 has a clamp unit 43 surrounding the periphery of the annular core portion 3 on the supply side of the second strand material 2 positioned in the opposite direction to the rotational direction of the annular core portion 3. Forming. This clamp unit 43 consists of two rollers 43a and 43b, prevents the lateral shaking of the annular core portion 3, maintains stable rotation in the circumferential direction, and The winding point is positioned, and high winding performance is obtained. In this example, the annular core portion 3 is rotated vertically while suppressing lateral shake.

The clamp unit 43 which consists of the said two rollers 43a and 43b prevents the lateral shake of the annular core part 3, and has the circumference | surroundings of the annular core part 3 also in the final finish cord diameter. The groove shape is not particularly limited, as it may have a function of fixing the winding point as a twisting opening of the second strand material 2 by surrounding it, maintaining stable rotation in the circumferential direction, and in addition to the U-shaped groove shape, a circular arc The groove shape of a shape and the groove shape of a V shape may be sufficient.

The support arm 41 swings on the stand 44 such that the support arm 41 penetrates by the swing mechanism 60 formed of the rotating disk 61 and the crankshaft 62 with the portion of the clamp unit 43 as a point. It is possibly installed.

In the annular core portion 3 supported by the support arm 41, the reel 51 is located outside the edge of the annular core portion 3 at one end of the period of the pendulum motion, as indicated by the solid line in FIG. At the other end of the period of the pendulum motion of the annular core portion 3, as shown by the solid line in Fig. 9, the swing is performed so as to be located within the edge of the annular core portion 3.

In the supply portion 50 of the second strand material 2, a pair of front and rear opposing cassette stands 52 do not interfere with the pendulum motion of the annular core portion 3 supported by the support arm 41. It is provided horizontally at a distance, and a reel transfer mechanism is formed at the distal end of the cassette stand 52 so as to face the surface of the annular core portion 3 to face each other.

The supply portion 50 has a reel 51 wound with the second strand material 2, a diameter slightly larger than the outer diameter of the reel 51, and at least a cylindrical outer peripheral wall corresponding to the reel inner width. It consists of the cassette 53. The reel 51 is rotatably housed in the cassette 53 so as to cover the entire wound surface of the second strand material 2 and is so-called a cartridge. A winding hole is formed in the outer circumferential wall of the cassette 53, and the second strand material 2 is drawn out from the winding hole toward the clamp unit 43 at the winding point of the annular core portion 3. The second strand material 2 is wound around the reel 51 at a predetermined coil diameter and is set in the cassette 53 of the supply portion 50.

At the opposite positions of the tips of the pair of cassette stands 52, the guide rods to which the cassette 53 can be removed and inserted freely can be mounted, and the cassette 53 mounted to one guide rod is guided to the other. The transfer mechanism which transfers to a rod is provided. The conveying mechanism is capable of conveying the cassette 53 mounted on one guide rod to the other guide rod by stretching the rod by an air cylinder and pressing the center of the cassette 53.

When the manufacturing apparatus M1 which has such a structure is used, the cyclic metal cord C1 is manufactured through the following processes.

As shown in Fig. 10, the first strand member 1 is bent in an annular shape, and the start end and the terminal end are welded to each other to form an annular core portion 3.

Next, the winding start end of the second strand material 2 is temporarily fixed to the annular core portion 3 using an adhesive tape or the like. After temporarily fixing, the annular core part 3 is set to the driving unit 40 of the manufacturing apparatus M1, this annular core part 3 is rotated in a circumferential direction, and the annular core of the 2nd strand material 2 is carried out. The winding to the section 3 is started.

In the case of the winding of the annular core 3 in the circumferential direction, and in the case of Z winding, the reel 51 wound around the second strand material 2 is located to the left with respect to the surface of the annular core 3, and is shown in FIG. 8. From the state where the reel 51 shown by the solid line is located outside the edge of the annular core part 3, the reel 51 shown by the solid line in FIG. 9 with the annular core part 3 as the clamp unit 43 as a point. ) The reel 51 by the air cylinder formed at the tip of the cassette stand 52 by pendulum movement of the annular core part 3 to the position which enters into the edge of the annular core part 3. When the cassette 53 is moved at right angles to the surface of 3) and the cassette 53 is moved to the guide rod of the other cassette stand 52, winding is performed half-life. Then, the reel 51 shown by the solid line in FIG. 9 is located in the edge of the annular core part 3, and the solid line in FIG. 8 makes the annular core part 3 the clamp unit 43 as a point. Pendulum moves the annular core portion 3 to a position where the reel 51 shown in the figure emerges out of the edge of the annular core portion 3, and the cassette ( When the reel 51 is moved at right angles with respect to the annular core surface together with 53), one winding is completed. By repeating such an operation, the second strand material 2 serving as the outer layer portion 4 is wound in a spiral shape on the outer circumferential surface of the annular core portion 3.

The reel 51 transversely reciprocates the core surface of the annular core portion 3 at a predetermined position, and the annular core portion 3 moves the clamp unit 43 serving as a cold point of the second strand material 2 to the point. As a pendulum moves, the distance from the reel 51 to the winding point of the second strand ash 2 is kept substantially constant, and at the time of winding, the second strand ash 2 withdrawn from the reel 51 is pulled out. Is not loosened, and the second strand material 2 is wound around the annular core portion 3 under a constant tension.

11 shows the movement trajectory of the reel 51 wound around the second strand material 2 and the movement trajectory of the annular core portion 3 pendulum-moving.

That is, from the state in which the reel 51 is in the position shown in Fig. 11 (a) of the outer side of the annular core part 3, the reel 51 is inserted into the edge of the annular core part 3 shown in Fig. 11 (b). Pendulum motion of the annular core part 3 to this position is carried out, and the reel 51 is changed into the opposite surface of the annular core part 3 shown in FIG. 11 (c) at the position shown in this FIG. The reel is then moved out of the edge of the annular core portion 3 shown in Fig. 11 (d) from the position shown in Fig. 11 (c) with the reel 51 on the opposite side of the annular core portion 3. Pendulum motion of the annular core part 3 is carried out until the position which 51 is located, and the reel 51 is the viewpoint position of an original surface from the opposite surface of the annular core part 3 (position of FIG. 11 (a)). Repeat the cycle to return to. 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 Fig. 11 (a) → (b) → (c) → (d) → (a). 11 (b) → (c), (d) → (a), the second strand material 2 is moved by moving the reel 51 at right angles to the core surface of the annular core portion 3. It is wound in a spiral shape around the annular core portion 3.

After the winding of the second strand material 2 is finished, as shown in Fig. 6, the winding start end 2a and the winding end part 2b of the second strand material 2 are welded and bonded. Thereby, the outer layer part 4 which consists of the 2nd strand materials 2 can be obtained.

After the winding start end 2a and the winding end 2b of the second strand material 2 are welded at the joining portion 7, the above-described annular core 3 and the outer layer 4 are subjected to low temperature annealing treatment. Do it. More specifically, the annular core portion 3 and the outer layer portion 4 are heat treated in a pressure chamber in which argon is introduced in a vacuum or a reduced pressure atmosphere. The temperature at the time of heat processing is 70-380 degreeC. Thereby, the internal deformation of the 1st metal element wire 5 and the 2nd metal element wire 6 can be removed, and the cyclic metal cord C1 without distortion can be obtained.

Then, in order to form the uncovered part 10A in the said cyclic metal cord C1, for example, an adhesive tape or a soft metal plate tape etc. over the whole perimeter of the cyclic | annular direction on the outer peripheral side of a cyclic | annular form. Adhesive masking tape.

And a coating adhesive is apply | coated to the outer peripheral surface of this cyclic metal cord C1, and a masking tape is removed after solidification of this coating adhesive.

In this case, the annular cord C1 has its outer peripheral side covered with the outer layer covering 10, and the outer layer covering 10 has a slit-shaped skin over the entire circumference of the annular direction on the other side of the annular outer peripheral side. The abdomen 10A is formed.

When such annular metal cord C1 is used for the endless metal belt of the continuously variable transmission mentioned later, for example, the endless metal belt which rotates without meandering can be obtained. The endless metal belt, which rotates without winding, does not wear out in contact with the surrounding parts, and thus high performance can be maintained for a long time.

As mentioned above, in 1st Embodiment, since it is covered with the outer-layer coating 10 which consists of a coating material which has elasticity, the cyclic metal cord C1 can be made into the strong thing which was excellent in breaking strength and fatigue resistance. In addition, the problem that the first strand material 1 and the second strand material 2 are unwound by the outer layer coating 10 can be eliminated, and the outer layer coating 10 becomes a cushioning material. Also in the contact point with a pulley or the like bent at a radius of curvature, the outer layer covering 10 increases the frictional resistance with the member on the opposite side where the annular metal cord C1 comes into contact, so that slippage can be suppressed and wear can be eliminated as much as possible. In addition, a good power transmission efficiency can be obtained, and it can be made very suitable for use as a power transmission belt.

In addition, the outer layer coating 10 can be formed and reinforced very easily by applying the coating adhesive to a predetermined location and solidifying the adhesive.

In addition, since at least one uncoated portion 10A is provided on the annular outer circumferential side of the outer layer coating 10, the lubricant can be smoothly infiltrated from the uncoated portion 10A to the inside. And the metal wires constituting each of the strand materials 1 and 2 between the annular core portion 3 and the outer layer portion 4, between the second strand materials 2 constituting the outer layer portion 4. It is possible to suppress the decrease in strength due to fretting wear and the shortening of life due to fatigue between (5, 6).

In addition, on the outer periphery side of the annulus in the outer layer coating 10, an uncoated portion 10A covering the entire circumference of the annular direction is formed at at least one place in the circumferential direction in the cross section of the outer layer portion 4. Therefore, the lubricant can be smoothly infiltrated from the uncoated portion 10A to the inside, and the strength decreases due to fretting wear between the strand members 1 and 2, and the life shortening due to fatigue is reduced. While suppressing, the uniformity of rigidity over the whole periphery of an annular direction can be aimed at.

In addition, since the hardness (JIS-A) is 22 to 60 and the elongation is 110 to 500% among the physical properties after the solidification of the coating material used as the outer layer coating 10, a high reinforcing effect can be obtained while ensuring flexibility and proper elongation. .

Here, if the hardness after the solidification of the coating material is too high, the flexibility of the annular metal cord C1 will be lost. On the contrary, if the hardness is too low, permanent deformation or wear may occur at the time of contact with the member on the other side. There is. In addition, without proper elongation, the bending deformation resistance of the cyclic metal cord C1 increases, and fatigue becomes easy.

Moreover, according to the manufacturing method of the above-mentioned annular metal cord C1, a masking tape is adhere | attached on the part used as the uncovered part 10A which did not form the outer layer coating 10 in the annular metal cord C1, and annularly By applying the coating adhesive which is a coating material to the outer peripheral surface of the metal cord C1, and removing the masking tape after solidification of this coating adhesive, it is covered by the outer layer coating 10 which consists of an adhesive for coating | coating, it is strong, and an outer layer part There is no problem that the 2nd strand material 2 used as (4) is unwound, and the cyclic | annular metal cord C1 which can penetrate a lubricant smoothly can be manufactured easily.

In addition, in 1st Embodiment, the 2nd strand material formed by twisting 7 2nd metal wires 6 to the 1st strand material 1 which twists 7 1st metal wires 5 mutually ( Since 2) is wound, the annular metal cord C1 can be made durable.

In addition, since the first strand ash 1 and the second strand ash 2 are joined separately, compared to the case where the first strand ash 1 and the second strand ash 2 are combined and joined, an annular metal. The possibility of the cord C1 breaking completely can be suppressed. Since the annular core portion 3 is formed from the first strand member 1 and the second strand member 2 is wound around the annular core portion 3 as the axis, an annular metal cord having a high breaking strength can be obtained. have. When the outer layer portion 4 is formed, the second strand ash 2 is wound six times instead of being wound around a plurality of second strand ashes 2, so that only one second strand ash 2 is required. Therefore, compared with the case of using two or more 2nd strand materials 2, since there are few joining places, the fall of the breaking strength of the cyclic metal cord C1 can be suppressed, and manufacture can be made easy. . Since the winding of the second strand material 2 is performed at a predetermined winding angle, the annular metal cord C1 having a substantially uniform surface state can be obtained without disturbing the winding of the second strand material 2. Since the force from the outside is given uniformly to such cyclic metal cord C1, the fall of breaking strength can be suppressed.

In addition, the position in the circumferential direction of the annular core portion 3 is different from the engaging portion of the first strand member 1 and the engaging portion of the second strand member 2. By shifting the positions of the engaging portions from each other, simultaneous breaking of the annular core portion 3 and the outer layer portion 4 is unlikely to occur, so that the decrease in the breaking strength of the annular metal cord C1 can be suppressed.

In addition, in the said embodiment, although the slit-shaped uncoated part 10A was formed over the perimeter of the annular outer peripheral side of the outer layer coating 10 on the annular direction, this uncoated part 10A covered the outer layer. What is necessary is just to form in at least one place on the outer side of the annular outer peripheral side of (10), and also in this case, a lubricant can penetrate inside from this uncoated part 10A. In this manner, the uncoated portion 10A can be made as small as possible, the reinforcing effect of the outer layer coating 10 can be enhanced, and the life can be extended.

Here, another example of the form of the non-coated portion 10A will be described.

12 is a cross-sectional view showing another embodiment of the uncoated portion 10A.

As shown in Fig. 12A, on the outer circumferential side of the annular layer 10, a plurality of uncoated portions 10A are formed over at least one or the entire circumference of the annular direction. According to the annular metal cord C1, the lubricant can more easily penetrate into the inside from the uncovered portion 10A, and constitute the outer layer portion 4 between the annular core portion 3 and the outer layer portion 4. Strength reduction due to fretting wear and shortening of life due to fatigue between the second strand members 1 and the metal wires 5 and 6 constituting each of the strand members 1 and 2. Can be suppressed.

As shown in Fig. 12B, the outer circumferential side of the annulus in the outer layer covering 10 is formed as the uncovered portion 10A over the entire circumference of the annular direction. According to the present invention, the lubricant can be more smoothly penetrated from the uncoated portion 10A to the inside, and the respective strand members 1 and 2 can be integrated while suppressing an increase in rigidity due to the formation of the outer layer coating 10. Can be.

As shown in Fig. 12 (c), on the outer circumferential side of the annular coating 10, one uncoated portion 10A is formed over at least one or the entire circumference of the annular direction. According to the annular metal cord C1, the lubricant can penetrate smoothly from the uncoated portion 10A to the inside from the inner circumferential side of the annular portion, and between the annular core portion 3 and the outer layer portion 4, the outer layer portion (4) strength reduction by fretting wear between the second strand materials (1) constituting (4) and the metal wires (5, 6) constituting each strand material (1, 2), and The shortening of the life due to fatigue can be suppressed.

As shown in Fig. 12 (d), a plurality of uncoated portions 10A are formed over at least one or the entire circumference of the annular direction while the annular inner circumferential side in the outer layer covering 10 is formed. According to the annular metal cord (C1), the lubricant can be more smoothly penetrated from the uncoated portion 10A to the inside from the annular inner circumferential side, and between the annular core portion 3 and the outer layer portion 4, the outer layer. Strength reduction by fretting wear between the second strand materials 1 constituting the portion 4 and between the metal wires 5 and 6 constituting the strand materials 1 and 2. And shortening of life due to fatigue can be suppressed.

As shown in Fig. 12E, the outer peripheral side of the annulus in the outer layer covering 10 is the uncoated portion 10A over the entire circumference of the annular direction, and the annular portion in the outer layer covering 10 is shown. On the other hand, one uncovered portion 10A is formed over at least one or the entire circumference of the annular direction, and according to the annular metal cord C1 having such a structure, from the outer peripheral side and the inner peripheral side of the annular In addition to allowing the lubricant to penetrate more smoothly inside, the strand members 1 and 2 can be integrated while maximally suppressing the increase in rigidity due to the formation of the outer layer coating 10.

Next, an example of the endless metal belt provided with the annular metal cord C1 which has the structure mentioned above is demonstrated.

Fig. 13 is a schematic perspective view showing a state of use of the endless metal belt according to this embodiment.

The endless metal belt B1 is used for the reducer 20 used in precision instruments and other industrial machines, for example, as shown in FIG. The endless metal belt B1 consists of three annular metal cords C1 arranged in parallel, and is responsible for power transmission between the small diameter driving side pulley 22 and the large diameter driven side pulley 24. The drive shaft of the drive motor 26 is connected to the rotation center of the drive side pulley 22. A circumferential groove is formed on the outer circumference of the driving side pulley 22 and the driven side pulley 24 to stably hold each annular metal cord C1, and the endless metal belt B1 is driven by the driving side pulley 22 and the driven side. By engaging the pulley 24, the rotational force of the drive side pulley 22 is transmitted to the driven side pulley 24 via the endless metal belt B1. At that time, the rotational speed of the driving side pulley 22 is decelerated by the driven side pulley 24, and the torque of the driving side pulley 22 is increased by the driven side pulley 24. The driven side pulley 24 is axially connected to another pulley not shown, for example, and transmits power.

As described above, the cyclic metal cord C1 has a very high breaking strength. Moreover, since the cross section is substantially circular shape, the cyclic metal cord C1 is strong in being twisted compared with the thing of a rectangular shape. Therefore, compared with the case where a flat belt is used as an endless metal belt, the endless metal belt B1 comprised using the some annular metal cord C1 becomes very excellent in bending resistance and durability.

In addition, this invention is not limited to the above-mentioned embodiment, A various kind of deformation | transformation is possible.

For example, in the cyclic metal cord C1 of 1st Embodiment, although the outer layer coating 10 was formed by solidifying the adhesive agent for coating, the outer layer coating 10 may be rubber for a tire or a belt.

That is, the outer layer coating 10 may be formed on the cyclic metal cord C1 by covering the cyclic metal cord C1 with rubber.

And in this way, even when the outer layer coating 10 is formed of rubber, the outer layer coating 10 made of rubber is provided around the annular metal cord C1, thereby breaking the annular metal cord C1 by breaking strength. And it can be made of a durable and excellent fatigue resistance, it is possible to eliminate the problem that the first strand material (1) and the second strand material (2) is loosened by the outer layer coating (10) and the outer layer coating made of rubber (10 ) Becomes a cushioning material, so that, for example, even at a contact point with a pulley or the like bent at a small radius of curvature, the frictional resistance with the member on the opposite side where the annular metal cord C1 contacts by the outer layer coating 10 becomes large. Therefore, slippage can be suppressed to minimize wear, and a good power transmission efficiency can be obtained, which makes it very suitable for use as a power transmission belt.

In addition, when the outer layer coating 10 is formed of rubber in this way, the sulfur component contained in the rubber reacts with and adheres to the plating of the second strand material 2.

In addition, the outer layer coating 10 made of rubber may be bonded to the second strand ash 2 constituting the outer layer portion 4 by the metal rubber adhesive for bonding the metal and the rubber. In this case, the second strand ash It is effective when the plating in (2) is not performed, rubber can be reliably attached to the 2nd strand material 2, and a reinforcement effect can be improved. For example, camlock (manufactured by LORD Fareast) can be used as the adhesive for metal rubber.

In addition, the rubber constituting the outer layer coating 10 is preferably vulcanized at a vulcanization pressure of 8 MPa or less. In this case, the intrusion of rubber into the inside can be suppressed and the lubricant can be satisfactorily penetrated, thereby providing a cyclic core. Between the portion 3 and the outer layer portion 4, between the second strand ashes 2 constituting the outer layer portion 4 and the respective metal wires 5 and 6 constituting the strand ashes 1 and 2. ) The reduction in strength due to friction and the shortening of life due to fatigue can be suppressed.

Here, the formation method of the outer layer coating 10 by rubber | gum is demonstrated.

First, masking tapes, such as an adhesive tape or a soft metal plate tape, are adhere | attached to the predetermined part used as the uncovered part 10A in the cyclic metal cord C1, for example.

Then, the tape is wound around the outer circumferential surface of the annular metal cord C1 by spirally wound.

Subsequently, the woven fabric is wound around the cyclic metal cord C1 to which the raw rubber is bonded, and it is accommodated in a vulcanized can, and pressurized water vapor is introduced into the vulcanized can and pressurized.

In this way, the raw rubber which has the plasticity wound around the cyclic metal cord C1 is vulcanized, and it becomes an vulcanized rubber which has elasticity.

Further, in the cross section, the annular metal cord C1 is disposed on one side of the pair of molds having an annular groove having a semicircular arc shape, and the mold is stored in the vulcanization can while the other mold is covered on the upper portion thereof. You may pressurize by introducing pressurized steam.

Thereafter, the masking tape is removed from the annular metal cord C1 taken out of the vulcanization can.

In this manner, the annular metal cord C1 is covered with a rubber outer layer covering 10 on its outer circumferential side, and an uncovered portion 10A is formed.

And as mentioned above, according to the manufacturing method of the cyclic | annular metal cord C1 which has the outer-layer coating 10 made of rubber | gum, the uncovered part 10A which does not form the outer layer coating 10 in the cyclic metal cord C1. The masking tape is adhered to the portion to be made), the raw rubber is adhered to the outer circumferential surface of the annular metal cord C1, and the masking tape is removed after the pressure vulcanization treatment is performed, thereby covering it with a rubber outer layer coating 10, In addition, there is no problem that the second strand material 2 serving as the outer layer part 4 is loosened, and the cyclic metal cord C1 with which the lubricant is smoothly penetrated can be easily manufactured.

For example, in the cyclic metal cord C1 of 1st Embodiment, it was set as the structure which wound the 2nd strand material 2 along the outer peripheral surface of the cyclic core part 3 six times. In the case where the diameters of the first strand member 1 and the second strand member 2 are different from each other, the annular core portion 3 may be wound seven times or eight times with a large diameter.

In addition, in the annular metal cord C1 of 1st Embodiment, as shown in FIG.5 (a), the 1st layer 2nd strand material 2 covers the outer peripheral surface of the annular core part 3. As shown in FIG. You may make it cover the outer peripheral surface of the annular core part 3 by the 2nd strand of the 2nd strand material 2 of several layers. For example, when covering the outer peripheral surface of the annular core part 3 with the 2nd layer 2nd strand material 2, the 2nd strand material 2 is wound 6 times on the outer peripheral surface of the annular core part 3, and the 1st layer After forming, the second strand ash 2 is wound 12 times on the outer peripheral surface of the first layer to form the second layer.

In addition, in the annular metal cord C1 of 1st Embodiment, the 1st strand material 1 and the 2nd strand material 2 are S twisted, and the 2nd strand material 2 with respect to the annular core part 3 is carried out. ) Winding is performed by Z twist, but the first strand material 1 and the second strand material 2 are Z twisted, and the second strand material 2 is wound around the annular core portion 3. May be configured to be S twisted.

In addition, although the cross section is substantially circular shape as shown to FIG. 5 (a), the cyclic metal cord C1 of 1st Embodiment may make a cross section into a flat shape. In this case, deformation is performed by pressing or the like on the substantially circular annular metal cord C1. By thus making the annular metal cord C1 flat, the contact area between the endless metal belt B1 including the annular metal cord C1, the driving side pulley 22 and the driven side pulley 24 is greatly increased. can do. As a result, power transmission between the drive side pulley 22 and the driven side pulley 24 can be performed more efficiently. Moreover, it is preferable that flatness is 66% or more.

In addition, in the endless metal belt B1 of this embodiment, although the annular metal cord C1 was set to the three types of the drive side pulley 22 and the driven side pulley 24, respectively, the annular metal cord which hangs is provided. The number of (C1) is not limited to this. According to the required bending resistance and durability, it is possible to adjust the number of the annular metal cords C1.

(2nd embodiment)

The annular metal cord according to the second embodiment will be described with reference to the drawings. The annular metal cord according to the first embodiment is composed of the first strand material and the second strand material, whereas the annular metal cord according to the second embodiment has a common structure except that the point is composed of one strand material. The same structure and the same structural part as said 1st Embodiment are attached | subjected, and it demonstrates.

FIG. 14 is a perspective view of the annular metal cord according to the second embodiment, FIG. 15 is a perspective view before carrying out outer layer coating of the annular metal cord according to the second embodiment, and FIG. 16 is an annular metal cord according to the second embodiment. It is a cross-sectional perspective view of the radial direction which shows the following. Fig. 17 is a perspective view showing a form in which strand material is wound once on an annular core portion included in the annular metal cord according to the second embodiment. Fig. 18A is a sectional view in the radial direction showing the annular metal cord according to the second embodiment, and Fig. 18B is a side view of the annular metal cord according to the second embodiment. 19 is an enlarged perspective view showing a part of the annular metal cord according to the second embodiment.

As shown in Fig. 14, the outer circumferential side of the annular metal cord C2 is covered with the outer layer coating 10. This outer layer coating 10 is the same material and structure as 1st Embodiment, and is formed by apply | coating and solidifying the coating adhesive. Alternatively, it may be formed of rubber as described in the first embodiment.

And this cyclic metal cord C2 has the uncovered part 10A which the outer layer coating 10 is not performed. This uncoated portion 10A is formed in a slit shape over the entire circumference of the annular direction, while the annular outer circumferential side in the outer layer covering 10 is formed.

As shown in Figs. 15 and 16, the annular metal cord C2 includes an annular core portion 13 and an outer layer portion 14 covering the outer circumferential surface of the annular core portion 13.

As shown in Fig. 17, the annular core portion 13 is formed by bending the strand material 11 at a predetermined diameter for an annular shape. The outer layer portion 14 around the annular core portion 13 has the annular core portion 13 as an axis, and continues the annular core portion constituting the annular core portion 13 to form the annular core portion. It is formed by winding around (13).

As shown in Fig. 18A, the strand material 11 twists a plurality of metal wires 15 together. In the second embodiment, as shown in Fig. 16, the strand material 11 has six metal wires 15 on the outer circumferential surface of the metal wires 15, centered on one metal wire 15. It is wound by S twist. As described above, since the strand member 11 has seven geometrically stable twists, the strand member 11 is strong and hardly broken.

The metal element wire 15 uses high carbon steel containing 0.60 mass% or more of C as a material. By selecting the material containing C or more than 0.60 mass%, the metal element wire 15 can be made into the steel wire which was more excellent in breaking strength. In addition, the material of the metal element wire 15 is not limited to what was mentioned above.

The diameter of the metal element wire 15 is 0.06 mm or more and 0.40 mm or less. Here, since the diameter of the metal element wire 15 is 0.06 mm or more, the rigidity of the strand material 11 becomes enough, and it can be made difficult to deform the annular core part 13. In addition, since the diameter of the metal element wire 15 is 0.40 mm or less, the rigidity of the strand material 11 does not increase beyond an appropriate level, and it is possible to make the cyclic metal cord C2 hardly cause fatigue fracture due to cyclic stress. have.

That is, when the strand material 11 is formed of the metal element wire 15 of such a diameter, the strand material 11 which has moderate rigidity can be obtained, and therefore, of the strand material 11 with respect to the annular core part 13, Winding becomes easy, and the loose winding of the strand material 11 becomes difficult to occur.

The strand material 11 is wound around the annular core portion 13 in a plurality of times, and is wound in a spiral shape as shown in FIGS. 16 and 17. The strand material 11 is wound so that there is no torsion. By winding without twisting, the loose winding of the strand material 11 can be suppressed.

In the second embodiment, the strand material 11 constituting the outer layer portion 14 is wound six times along the outer circumferential surface of the annular core portion 13. The strand material 11 wound around the annular core portion 13 is composed of one strand material 11 continuous with the annular core portion 13, and the strand material 11 is formed on the outer circumferential surface of the annular core portion 13. By winding six times, it is possible to wind up without a gap substantially. As a result, the outer layer portion 14 densely covers the annular core portion 13. As shown in Fig. 18A, the cross section of the annular metal cord C2 has a shape in which six strand materials 11 are arranged around the strand material 11 that is the annular core portion 13.

The strand material 11 which comprises the outer layer part 14 is wound by Z twist on the outer peripheral surface of the annular core part 13, as shown in FIG. Since the first strand member 11 itself is formed by S twisting, the annular metal cord C2 combines S twisting and Z twisting. Therefore, the twisting direction of the metal element wire 15 and the winding direction of the outer layer part 14 with respect to the annular core part 15 are reverse, and it is difficult to twist, and the annular metal cord C2 with little unevenness | corrugation in surface appearance is obtained. Can be.

In addition, the strand material 11 constituting the outer layer portion 14 is wound at a predetermined winding angle with respect to the central axis of the annular core portion 13. For this reason, the strand material 11 is wound up undisturbed, and the cyclic metal cord C2 of a substantially uniform surface state can be obtained. In the second embodiment, as shown in Fig. 18B, the winding angle θ of the strand material 11 with respect to the X direction, that is, the direction in which the central axis of the annular core portion 13 extends is 4.5. It is more than 13.8 degrees more than. By setting the winding angle θ to 4.5 degrees or more, loose winding of the strand material 11 is unlikely to occur. By setting the winding angle θ to 13.8 degrees or less, the elongation rate of the strand material 11 can be prevented from becoming excessively large. That is, by setting the winding angle θ of the strand material 11 of the outer layer portion 14 wound around the annular core portion 13 to 4.5 degrees or more and 13.8 degrees or less, the annular metal cord C2 having an appropriate elongation and easy to bend. ) Can be obtained. When such an annular metal cord C2 is used for the said endless metal belt, for example, power transmission between a drive side pulley and a driven side pulley can be performed with high precision.

As shown in Fig. 19, the winding start end 11a and the winding end 11b of the strand material 11 constituting the annular core portion 13 and the outer layer portion 14 are joined to each other by welding. In addition, the coupling part 17 is covered with the connection member 18.

The connecting member 18 is made of a sleeve having excellent flexibility formed in a coil spring shape, and the connecting member 18 is coupled to the start end 11a and the end 11b, which are both ends of the strand material 11. It is fixed by an adhesive so as to cover the outer circumference of the portion 17. The connection member 18 which consists of a coil spring shaped sleeve deform | transforms flexibly according to the curved shape of the strand material 11, and protects and reinforces the welding part of the strand material 11. As shown in FIG.

In this way, by using the connecting member 18 made of the coil spring-shaped sleeve excellent in flexibility, the start end portion 11a and the end portion 11b of the strand material 11 are joined to each other to form the annular core portion 13 side. The coupling part 17 of the start end part 11a of the strand material 11 and the end part 11b of the strand material 11 of the outer layer part 14 which inclined with respect to this start end part 11a is its shape. According to the present invention, it can be attached in a well-covered state, whereby the coupling portion 17 between the start end 11a and the end 11b of the strand material 11 can be well protected. In addition, since the connection member 18 does not inhibit the deformation of the strand material 11 in the coupling part 17, the flexibility of the strand material 11 between the coupling part 17 and other places is equal. The mechanical properties of the annular metal cord C2 can be made substantially uniform over the entire circumference.

In addition, the coupling portion 17 between the start end portion 11a and the end portion 11b is formed on one side of both side portions, except for the inner circumferential side and the outer circumferential side of the circular arc with respect to the arc of the annular metal cord C2. It is arranged. Thereby, even if the cyclic metal cord C2 deforms in the radial direction, the load which acts on this coupling part 17 can be reduced, and the break in the coupling part 17 can be suppressed.

In this way, the annular metal cord C2 uses the connecting member 18 after winding the strand material 11 constituting the outer layer portion 14 to the strand material 11 constituting the annular core portion 13. And the end 11a and the end 11b of the strand material 11 are formed.

In addition, it is good also as a connection structure only by welding, without forming the connection member 18 in the engaging part 17 of 2nd Embodiment. In addition, you may form the connection member 18 of 2nd Embodiment in the junction part 7 of 1st Embodiment. As a result, since the engaging portion of the strand material 11 is covered and protected by the outer layer covering 10, the strength required as the annular metal cord can be ensured.

Subsequently, the manufacturing method of the cyclic metal cord C2 is demonstrated. As the manufacturing apparatus, those shown in Figs. 7 to 9 can be used similarly to the first embodiment.

First, as shown in FIG. 20, the starting end side of one strand material 11 is bent annularly, and the annular core part 13 is formed.

Next, the part where the strand material 11 for two in the vicinity of the start end part 11a overlaps is temporarily fixed by winding an adhesive tape, a string, a spring, etc.

After temporarily fixing, the annular core portion 13 is set in the driving unit 40 of the manufacturing apparatus M1 (see FIGS. 7 to 9), and the annular core portion 13 is rotated in the circumferential direction, so that the strand material Winding to the annular core part 13 of (11) is started.

Winding of the stranded material 11 is performed as shown in FIG. 11 similarly to 1st Embodiment, and the stranded material 11 used as the outer layer part 14 is spirally formed on the outer peripheral surface of the annular core part 13. It will be rolled up.

After the winding of the strand material 11 is finished, the winding end portion 11b of the strand material 11 is inserted into the connecting member 18, and the temporary fixation of the portion near the start portion 11a is removed. 11a and the end part 11b are welded together. Subsequently, an adhesive agent is applied to the coupling portion 17 between the start end portion 11a and the termination portion 11b, and the connecting member 18 is slid to the position covering the coupling portion 17. In this way, as shown in FIG. 19, the connection member 18 is fixed to the coupling | bonding part 17 by an adhesive agent, the coupling | bonding part 17 is protected by the connection member 18, and is shown in the engagement point. Breakage is suppressed.

Here, the strand member 11 is slightly inclined with respect to the end portion 11a on the outer circumferential layer 14 with respect to the start end portion 11a on the annular core portion 13 side. Since 18 is excellent in flexibility which consists of a coiled spring sleeve, the connection member 18 can be easily attached to the engaging part 17. As shown in FIG.

As described above, the strand layer 11 is wound around the annular core portion 13 and the start end portion 11a and the end portion 11b are joined to form the outer layer portion 14 around the annular core portion 13. Can be formed.

After the start end portion 11a and the end portion 11b are joined using the connecting member 18, the above-described annular core portion 13 and the outer layer portion 14 are subjected to low temperature annealing treatment in the same manner as in the first embodiment. do. Thereby, the internal strain of the metal element 15 can be removed, and the cyclic metal cord C2 without distortion can be obtained.

After that, in the same manner as in the first embodiment, the masking tape is adhered to a predetermined portion of the uncovered portion 10A, the coating adhesive is applied to the outer circumferential surface of the annular metal cord C2, and after the coating adhesive is solidified Remove the masking tape.

As a result, the outer circumferential side of the annular cord C2 is covered with the outer layer covering 10, and the uncoated portion 10A is formed over the circumferential direction while the annular outer circumferential side is formed.

When such an cyclic metal cord C2 is used for the said endless metal belt, for example, an endless metal belt which rotates without winding can be obtained. The endless metal belt, which rotates without winding, does not wear in contact with the surrounding parts, and thus high performance can be maintained for a long time.

As mentioned above, also in the case of 2nd Embodiment, since it is covered by the outer-layer coating 10 which consists of an elastic coating material, the cyclic metal cord C2 can be made into the strong thing excellent in breaking strength and fatigue resistance. In addition, the problem that the strand material 11 is loosened by the outer layer coating 10 can be eliminated, and the outer layer coating 10 becomes a buffer material, for example, in contact with a pulley or the like bent at a small radius of curvature. Also at the point, since the outer layer coating 10 increases the frictional resistance with the member on the opposite side where the annular metal cord C2 contacts, the slippage can be suppressed to eliminate wear as much as possible and a good power transmission efficiency can be obtained. It can be made to be very suitable for use as a power transmission belt.

In addition, the outer layer coating 10 can be formed and reinforced very easily by applying the coating adhesive to a predetermined location and solidifying the adhesive.

In addition, since the annular outer circumferential side of the outer layer coating 10 has the uncoated portion 10A, the lubricant can be smoothly penetrated from the uncoated portion 10A to the inside, and the annular core portion 3 Strength and fatigue due to fretting wear between the outer layer portion 4 and each of the strand members 11 and between the metal element wires 15 constituting the strand members 11. The shortening of the life can be suppressed.

In addition, since the uncovered portion 10A is formed over the entire circumference of the annular direction, it is possible to smoothly infiltrate the lubricant from the uncovered portion 10A to the inside, and between the strand materials 11 to each other. The uniformity of the stiffness over the entire circumference of the annular direction can be achieved while suppressing the decrease in strength due to fretting wear and shortening of the life due to fatigue.

In addition, since the hardness (JIS-A) is 22 to 60 and the elongation is 110 to 500% among the physical properties after the solidification of the coating material used as the outer layer coating 10, a high reinforcing effect can be obtained while ensuring flexibility and proper elongation. .

Here, if the hardness after the solidification of the coating material is too high, the softness of the cyclic metal cord C2 is lost, and if the hardness is too low, there is a fear that permanent deformation or wear will occur upon contact with the member on the other side. There is. In addition, without proper elongation, the bending deformation resistance of the cyclic metal cord C2 increases, and fatigue becomes easy.

Moreover, according to the manufacturing method of the cyclic metal cord C2 mentioned above, a masking tape is adhere | attached on the part used as the uncovered part 10A which did not form the outer layer coating 10 in the cyclic metal cord C2, and annular By applying the coating adhesive which is a coating material to the outer peripheral surface of the metal cord C2, and removing the masking tape after solidification of this coating adhesive, it is covered by the outer layer coating 10 which consists of a coating adhesive, and it is strong, and an outer layer part There is no problem that the strand material 11 used as (14) is unwound, and the cyclic | annular metal cord C2 which can penetrate a lubricant smoothly can be manufactured easily.

In addition, in 2nd Embodiment, the strand material 11 which twists seven metal element wires 15 mutually, and is helical with respect to the annular core part 13 and this annular core part 13 in multiple times. The outer layer portion 14 is formed to be wound and covers the outer circumferential surface of the annular core portion 13, and the annular core portion 13 and the outer layer portion 14 are formed of continuous strand material 11, so that the annular metal cord ( C2) can be made durable, and the possibility of breaking the annular metal cord C2 completely can be suppressed as compared with the case where a plurality of strand materials are combined and joined at one place in the circumferential direction as in the prior art. That is, since the annular core part 13 is formed from the strand material 11, and the strand material 11 is wound continuously by making this annular core part 13 the axial center, the annular metal cord with a high breaking strength can be obtained. have. In addition, since the external force applied to the annular metal cord C2 can be received by the continuous annular core portion 13 and the outer layer portion 14, the applied external force is dispersed throughout the annular metal cord C2 and locally. Concentration of load can be avoided.

In addition, when the outer layer portion 14 is formed, the strand ash 11 is wound around the strand ash 11 constituting the annular core portion 13 six times instead of being wound around a plurality of strand ashes 11. Since only 1) is required, the number of joining points is reduced as compared with the case where a plurality of strands 11 are used, so that the decrease in the breaking strength of the cyclic metal cord C2 can be suppressed and the production is easy. It can be done. In addition, since the winding of the strand material 11 of the outer layer portion 14 is performed at a predetermined winding angle, there is no disturbance in the winding of the strand material 11, and the annular metal cord C2 having a substantially uniform surface state is provided. You can get it. Since the force from the outside is given uniformly to such cyclic metal cord C2, the fall of a breaking strength can be suppressed.

Moreover, also in the said 2nd Embodiment, although the slit-shaped uncoated part 10A was formed over the perimeter of the annular outer periphery side of the outer layer coating 10 in the annular direction, this uncoated part 10A is The outer layer covering 10 may be formed at at least one position on the annular outer circumferential side of the outer layer, and in this case as well, the lubricant can penetrate into the inside from the uncoated portion 10A. In this manner, the uncoated portion 10A can be made as small as possible, the reinforcing effect of the outer layer coating 10 can be enhanced, and the life can be extended.

Also in the second embodiment, it is possible to take the form of the uncovered portion shown in FIG. 12 described in the first embodiment, in which case the same effects as in the first embodiment are obtained.

Further, the annular metal cord C2 according to the second embodiment can also be used for the endless metal belt shown in FIG.

And according to the endless metal belt using this cyclic metal cord C2, since breaking strength of the cyclic metal cord C2 is very large as mentioned above, it becomes very excellent in bending resistance and durability.

Moreover, also in the case of the cyclic metal cord C2 which concerns on 2nd Embodiment, various kinds of deformation | transformation are possible, without being limited to said embodiment.

For example, also in the cyclic metal cord C2 of 2nd Embodiment, you may form the outer layer coating 10 with the rubber for tier or belt.

That is, the outer layer coating 10 may be formed on the cyclic metal cord C2 by covering the cyclic metal cord C2 with rubber. Also in the case where the outer layer coating 10 is formed of rubber, as described in the first embodiment, the cyclic metal cord C2 can be made sturdy with excellent breaking strength and fatigue resistance.

In the annular metal cord C2 of the embodiment described above, when the annular core portion 13 is formed, an extra length portion is formed on one end side of the strand material 11 and temporarily fixed, thereby forming an outer layer. A part of the unit 14 may be configured.

In addition, in the cyclic metal cord C2 of 2nd Embodiment, as shown to FIG. 18 (a), the strand material 11 of one layer covers the outer peripheral surface of the cyclic core part 13. As shown in FIG. This may be such that a plurality of layers of the strand material 11 cover the outer circumferential surface of the annular core portion 13. For example, when the outer peripheral surface of the annular core portion 13 is covered with two layers of strand material 11, the strand material 11 is wound six times on the outer peripheral surface of the annular core portion 13 to form the first layer. The strand ash 11 is wound 12 times on the outer circumferential surface of the first layer to form the second layer. Moreover, it is preferable to make 12 winding directions corresponded to 2nd layer into the reverse direction to 6 winding directions corresponded to 1st layer. Such a winding direction is important for obtaining good winding property and obtaining an outer surface with less unevenness.

In the annular metal cord C2 of the second embodiment, the strand member 11 is S twisted, and the winding of the strand member 11 of the outer layer portion 14 to the annular core portion 13 is Z twisted. Although it is set as the structure made into the structure, it is good also as a structure which makes the strand material 11 into Z twist, and winding the strand material 11 of the outer layer part 14 with respect to the annular core part 13 by S twist.

In addition, although the cross section is substantially circular shape as shown to FIG. 18 (a), the cyclic metal cord C2 of 2nd Embodiment may make a cross section into flat shape as demonstrated in 1st Embodiment. .

(Third embodiment)

The annular metal cord according to the third embodiment will be described with reference to the drawings.

As shown in Fig. 21, the annular metal cord C3 according to the third embodiment has the same annular core portion 3 and outer layer portion 4 as the annular metal cord C1 according to the first embodiment. The outer layer coating 10 is formed in the outer peripheral side of the outer layer part 4 by the form different from 1st Embodiment. In this cyclic metal cord C3, the uncovered part 10A which is the exposure part of the coating | cover part 10 covered by the outer layer coating and the outer layer part 4 without an outer layer coating is alternately formed. The coating part 10 which has this outer layer coating is formed by apply | coating and solidifying the coating agent similar to 1st, 2nd embodiment. Alternatively, the covering part 10 is formed of the same rubber as the first and second embodiments.

The covering part 10 covered by the outer layer covering is longer than the uncovered part 10A and includes at least the junction 7 (see FIG. 6) of the winding start end and the winding end of the outer layer part 4. The periphery is covered with an outer layer covering.

In the annular core part 3, you may form the adhesive solidification part which solidified the coating adhesive on the outer peripheral surface. When the adhesive solidification part is formed, the adhesive solidification part and the non-adhesion solidification part without the coating adhesive are alternately formed. In addition, the adhesion solidification part in the annular core part 3 becomes longer than a non-adhesion solidification part, and in the uncovered part 10A without the outer layer coating in the outer layer part 4, and in the annular core part 3, The non-adhesive solidified portion without the adhesive for coating may be disposed at a position different in the circumferential direction.

The coating adhesive which forms an adhesion | attachment solidification part in this annular core part 3 can use the same thing as the coating adhesive which forms an outer layer coating.

The annular core part 3 is the same structure as 1st Embodiment, and is formed by joining the both ends of the 1st strand material 1. As shown in FIG.

The outer layer part 4 is also the same structure as 1st Embodiment, and is formed by winding the 2nd strand material 2 using the annular core part 3 as the axial center.

The manufacturing method of the cyclic metal cord C3 is also the same as the manufacturing method of the cyclic metal cord C1 except the form of the coating part 10 and 10 A of uncoated parts.

In addition, when forming an adhesive solidification part in the annular core part 3, by apply | coating and solidifying an adhesive agent for coating to the predetermined position of the outer peripheral surface of the annular core part 3, the adhesive solidification part and the coating agent which solidified the coating adhesive Alternately forming non-adhesive solidified parts without adhesive.

When the annular metal cord C3 is used for the endless metal belt B1 (see Fig. 13), for example, an endless metal belt that rotates without winding can be obtained. The endless metal belt, which rotates without winding, does not wear in contact with the surrounding parts, and thus high performance can be maintained for a long time.

In 3rd embodiment, the periphery including the junction part 7 of the winding start end 2a of the 2nd strand material 2 which comprises the outer layer part 4 by the outer layer coating, and the winding termination part 2b is carried out. Since it covered, the cyclic | annular metal cord C3 can be made strong, especially the junction part of the winding start part 2a of the 2nd strand material 2 which comprises the outer-layer part 4, and the winding end part 2b. (7) can be firmly reinforced, and furthermore, the problem that the 2nd metal wire 6 which comprises the 2nd strand material 2 is loosened can be eliminated.

In addition, since the covering portion 10 covered by the outer layer covering and the uncovered portion 10A without the outer layer covering were alternately formed over the entire circumferential surface and the entire length of the outer layer portion 4, the uncovered portion 10A. Lubricants, such as machine oil, can be penetrated smoothly from inside to between, and between the annular core part 3 and the outer layer part 4, between the 2nd strand materials 2 which comprise the outer layer part 4, and each The reduction in strength due to friction and the shortening of life due to fatigue between the metal wires 5 and 6 composing the strand materials 1 and 2 can be suppressed.

In addition, the coated portion 10 is made longer than the uncoated portion 10A, and the uncoated portion 10A can be made as long as possible with the minimum length required for the lubricant to penetrate therein, and the reinforcing effect can be enhanced. It can achieve long life.

Moreover, what is necessary is just to form 10 A of uncovered parts in the circumferential direction of the outer layer part 4, and also in this case, a lubricant can penetrate inside this uncovered part 10A. In this manner, the uncoated portion 10A can be made as small as possible, the effect of covering the outer layer can be enhanced, and the life can be extended.

Moreover, when the adhesive solidification part which solidified the coating adhesive and the non-adhesion solidification part without a coating adhesive are alternately formed in the outer peripheral surface of the annular core part 3, the annular core part 3 itself is formed by an adhesive solidification part. It can reinforce and the intensity | strength of the cyclic metal cord C3 can be raised. In addition, by forming the non-bonded solidified portion, the lubricant can smoothly penetrate into the annular core portion 3 from the non-bonded solidified portion, thereby constituting the first strand material 1 serving as the annular core portion 3. The reduction in strength due to friction and the shortening of life due to fatigue between the first metal wires 5 can be suppressed.

Furthermore, by deviating the position of the non-coated portion 10A of the outer layer coating and the non-bonded solidified portion in the annular core portion 3 in the circumferential direction, the reinforcing effect of forming these non-coated portions 10A and the non-bonded solidified portion The fall can be suppressed as much as possible.

Moreover, according to the manufacturing method of the cyclic metal cord C3, the 2nd strand which becomes strong and becomes the outer layer part 4 can be formed in the same process as 1st Embodiment by forming the outer layer coating which consists of a coating adhesive or rubber | gum. The cyclic metal cord C3 which does not have a problem that each metal element wire 6 which comprises the ash 2 is loosened can be manufactured easily.

In addition, the cyclic metal cord C3 which concerns on 3rd Embodiment can take the various forms demonstrated in 1st Embodiment, and they bring about the same effect as 1st Embodiment.

(4th embodiment)

The annular metal cord according to the fourth embodiment will be described with reference to the drawings.

As shown in Fig. 21, the annular metal cord C4 according to the fourth embodiment has the same annular core portion 13 and outer layer portion 14 as the annular metal cord C2 according to the second embodiment. The outer layer coating 10 is formed in the outer peripheral side of the outer layer part 14 in the form different from 2nd Embodiment. As for this cyclic metal cord C4, the uncovered part 10A which is the exposure part of the coating | cover part 10 covered by the outer layer coating and the outer layer part 14 without an outer layer coating is alternately formed. The coating part 10 which has this outer layer coating is formed by apply | coating and solidifying the coating adhesive similar to 1st-3rd embodiment. Alternatively, the covering portion 10 is formed of the same rubber as in the first to third embodiments.

As described above, the annular metal cord C3 according to the third embodiment is composed of the first strand material and the second strand material, whereas the annular metal cord C4 according to the fourth embodiment is composed of one strand material. Others have a common structure.

The manufacturing method of the cyclic metal cord C4 is also the same as the manufacturing method of the cyclic metal cord C2 except the form of the coating part 10 and 10 A of uncoated parts.

In addition, when forming an adhesive solidification part in the annular core part 13, by apply | coating and solidifying an adhesive agent for coating | coating to the predetermined position of the outer peripheral surface of the annular core part 13, the adhesive solidification part for coating | cover and solidification for coating Alternately forming non-adhesive solidified parts without adhesive.

When the cyclic metal cord C4 is used for the above endless metal belt B1 (see Fig. 13), for example, an endless metal belt that rotates without winding can be obtained. The endless metal belt, which rotates without winding, does not wear in contact with the surrounding parts, and thus high performance can be maintained for a long time.

Also in the case of 4th Embodiment, the engaging part 17 of the winding start end 11a and the winding termination part 11b of the strand material 11 which comprises the outer layer part 14 by outer layer coating (refer FIG. 19) It covers the periphery containing, and can make the annular metal cord C4 strong. In particular, the engaging portion 17 between the winding start end 11a and the winding termination end 11b of the strand material 11 constituting the outer layer portion 14 can be firmly reinforced, and further, the strand material 11 The problem that the metal element wire 15 which comprises) is loosened can be eliminated.

In addition, since the covering part 10 covered by the outer layer covering and the uncovered part 10A without outer layer covering were alternately formed over the entire circumferential surface and the entire length of the outer layer portion 14, from the uncovered portion 10A. Lubricant can be penetrated smoothly inside, and between the annular core part 13 and the outer layer part 14, between the strand material 11 which comprises the outer layer part 14, and each strand material 11 is carried out. The reduction in strength due to friction and the shortening of life due to fatigue can be suppressed between the metal wires 15 constituting each other.

In addition, since the covering portion 10 is made longer than the uncovered portion 10A, the uncovered portion 10A can have the longest covering portion as long as the minimum length necessary for the lubricant to penetrate therein, and the reinforcing effect can be enhanced. In addition, long life can be achieved.

The uncoated portion 10A may be formed at at least one position in the circumferential direction of the outer layer portion 14, and in this case, the lubricant can also penetrate the inside from the uncoated portion 10A. In this manner, the uncoated portion 10A can be made as small as possible, the effect of the outer layer coating 10 can be enhanced, and the life can be extended.

Moreover, when the adhesive solidification part which solidified the coating adhesive and the non-adhesion solidification part without a coating adhesive are formed alternately on the outer peripheral surface of the annular core part 13, the annular core part 13 itself is formed by an adhesive solidification part. It can reinforce and the intensity | strength of the cyclic metal cord C4 can be raised. In addition, by forming the non-bonded solidified portion, the lubricant can smoothly penetrate into the annular core portion 13 from the non-bonded solidified portion, and the metal constituting the strand material 11 to be the annular core portion 13. The reduction in strength due to friction between the element wires 15 and the shortening of life due to fatigue can be suppressed.

Furthermore, the non-coated portions 10A of the outer layer coating 10 and the positions of the non-bonded solidified portions in the annular core portion 13 are deflected in the circumferential direction, thereby forming these uncoated portions 10A and the non-bonded solidified portions. The fall of a reinforcement effect can be suppressed as much as possible.

In addition, according to the manufacturing method of the cyclic metal cord C4, it is possible to form the outer layer coating made of the adhesive or rubber for coating in the same process as in the second embodiment, which is strong and serves as the outer layer portion 14 ( It is possible to easily manufacture the annular metal cord C2 which does not have a problem of loosening the respective metal wires 15 constituting 11).

In addition, the cyclic metal cord C4 which concerns on 4th Embodiment can employ | adopt the various forms demonstrated in 2nd Embodiment, and they bring about the same effect as 2nd Embodiment.

Moreover, in the said embodiment, although the cyclic metal cord was applied to the endless metal belt which transmits power in a speed reducer, the cyclic metal cord of this invention can be applied also to the endless metal belt used other than a speed reducer. For example, in a printing machine including a printer, an endless metal belt for transmitting power between paper sending rollers, an endless metal belt for direct driving of a single-axis robot, an endless metal belt for driving an XY table mechanism or driving a three-dimensional carriage. The present invention can be applied to an endless metal belt for precise driving in an optical device, an inspector, or a measuring instrument.

Although this invention was demonstrated in detail or with reference to the specific embodiment, it is clear for those skilled in the art that various changes and correction can be added without deviating from the mind and range of this invention. This application is a Japanese patent application (2006-291728) filed October 26, 2006, a Japanese patent application (2007-050573) filed February 28, 2007, and a Japanese patent application filed June 4, 2007 It is based on a patent application (2007-148298), the contents of which are incorporated herein by reference.

Claims (19)

An annular core portion formed in an annular shape and an outer layer portion wound in a spiral shape with respect to the annular core portion by a strand material formed by twisting a plurality of metal filaments with each other are formed to cover the outer peripheral surface of the annular core portion. As cyclic metal cord, At least a portion of the outer layer portion is covered with an outer layer coating made of an elastic covering material. The method of claim 1, An annular metal cord comprising at least a periphery of the outer layer portion, including a joining portion between a winding start end and a winding terminal end, is covered by an outer layer coating. The method of claim 1, An annular metal cord comprising at least one non-coated portion on an outer circumferential side half surface of the annular layer coating. The method of claim 1, An annular metal cord, wherein an uncoated portion covering the entire circumference of the annular direction in the outer layer coating is formed at at least one position in the circumferential direction in the cross section. The method of claim 1, The annular metal cord, characterized in that the outer circumferential side of the annular portion in the outer layer coating is an uncovered portion over the entire circumference of the annular direction. The method of claim 1, The annular metal cord having at least one uncoated portion on the other hand, while having an annular inner circumferential side in the outer layer coating. The method of claim 1, An annular metal cord comprising alternately formed covering portions covered with the outer layer covering and uncovered portions without the outer layer covering over the entire circumferential surface and the entire length of the outer layer portion. The method of claim 7, wherein The annular metal cord, wherein the covering portion is longer than the uncovered portion. The method of claim 7, wherein The said to-be-coated part is provided in at least 1 place in the annular direction of the said outer layer part, The cyclic metal cord characterized by the above-mentioned. The method of claim 7, wherein An annular metal cord comprising alternately formed adhesive solidifying portions obtained by hardening a coating adhesive and non-bonding solidifying portions without a coating adhesive on an outer circumferential surface of the annular core portion. The method of claim 10, The said uncovered part without the said outer layer coating in the said outer layer part, and the non-adhesive solidification part without the adhesive agent for coating in the said annular core part are arrange | positioned in the other position in an annular direction, It is characterized by the above-mentioned. code. The method of claim 10, The said coating adhesive is a cyclic metal cord characterized by the hardness of 22-60 and elongation rate 110-500% among the physical properties after the solidification. The method of claim 1, The outer layer coating has a cyclic metal cord, characterized in that hardness is 22 to 60 and elongation is 110 to 500% in physical properties after the solidification. The method of claim 1, The outer layer coating is made of rubber, characterized in that the cyclic metal cord. The method of claim 14, The rubber constituting the outer layer coating is bonded to the outer layer portion by a metal rubber adhesive for bonding the metal and the rubber. The method of claim 14, The rubber constituting the outer layer coating is vulcanized at a vulcanization pressure of 8 MPa or less. An endless metal belt comprising the annular metal cord according to any one of claims 1 to 16. As a method of manufacturing the cyclic metal cord according to any one of claims 1 to 16, A masking tape is adhered to a place where said outer layer coating of said cyclic metal cord is not formed, a coating adhesive is applied to an outer peripheral surface of said outer layer, and said masking tape is removed after solidifying said coating adhesive. Method of manufacturing cyclic metal cords. As a method of manufacturing the cyclic metal cord according to any one of claims 1 to 16, The masking tape is adhered to a portion which does not form the outer layer coating of the annular metal cord, the raw rubber is adhered to the outer circumferential surface of the outer layer, and the masking tape is removed after the pressure vulcanization treatment is performed. The manufacturing method of the cyclic metal cord made into.