JP2003322216A - Toothed belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toothed belt in which the surface of a toothed part of a belt main body formed of rubber composition is coated with fiber fabric with reduced friction resistance of the fiber fabric over a long period to improve a service life of the toothed belt. <P>SOLUTION: This toothed belt comprises a plurality of tooth parts 3 disposed at a prescribed interval along a length direction, a back part 2 where a core wire 1 is embedded, and tooth cloth 4 covering the surface of the tooth parts 3. As the tooth cloth 4, unprocessed fiber fabric is impregnated in a first processing liquid of RFL processing liquid to be dried. It is then impregnated in a second processing liquid comprising rubber cement containing carbon nanotubes 23 to be dried. After a coating rubber layer is attached, these are integrated by vulcanization and pressurization. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a toothed belt,
In particular, the present invention relates to those having improved wear resistance and tooth chipping resistance.

[0002]

2. Description of the Related Art Toothed belts for simultaneously driving a camshaft of an automobile engine and auxiliary machines such as an injection pump, an oil pump, a water pump, etc., are required to meet the operating conditions as the engine output becomes high and the engine room becomes compact. Has become more severe, and further improvement in durability has been demanded. Similarly, the toothed belt used in general industrial machines is required to extend the belt replacement cycle.

Such failure modes of the toothed belt are roughly classified into belt cutting due to fatigue of the core wire and tooth loss due to overload and wear of tooth cloth. For cutting due to fatigue of the core wire,
Use of aramid core wire or high-strength glass small diameter core wire, use of hydrogenated nitrile rubber (H-NBR) compound with excellent heat resistance, keep the belt tension constant at both start and running as an engine improvement This has been improved by the use of auto tensioners, etc., and the occurrence of disconnection failures has decreased.

However, the occurrence of tooth chipping is still insufficient, although measures such as the use of high strength nylon 6-6 and tooth cloth using aramid fiber have been taken. Therefore, in order to further improve the tooth chipping resistance of the toothed belt coated with the tooth cloth, it is considered promising to reduce the friction coefficient of the tooth cloth surface. EP 0662571B1 proposes a toothed belt in which a polymer matrix layer containing a fluororesin is coated on the outside of a fabric layer of a tooth cloth by spraying or coating. The fluororesin is bound in a special polymer matrix without a boundary layer. Then, the polymer matrix is bonded to the tooth cloth. However, since the fluororesin is firmly bound to the polymer matrix, the fluororesin remains surrounded by the matrix, and the friction coefficient reducing action of the fluororesin cannot be sufficiently exhibited. Also, due to the material limitation of the polymer matrix,
There is a problem in that the amount of fluororesin that can be contained is small and the thickness of the polymer matrix layer is thin, so that the improvement in tooth chipping resistance by the fluororesin is not sufficient.

Further, in Japanese Unexamined Patent Publication No. 7-151190, the surface and the inside of a tooth cloth are impregnated with a rubber mixture containing a fibrous fluororesin, and the back surface of the tooth cloth is covered with a rubber layer of a belt main body through an adhesive layer. Coupling toothed belts have been proposed. The reason why the fluororesin in the rubber mixture is made into fibers by a kneading step or the like is that the fluororesin in the rubber mixture does not become foreign matter and the strength of the rubber mixture is not lowered. However, there is a problem in that the fluororesin fiberized in the rubber mixture is less likely to be exposed on the friction surface, and the friction coefficient reducing action of the fluororesin is not sufficient. Further, in order to maintain the strength of the fluororesin without fibrating it to make it foreign matter, only about 1 to 30 parts by weight of the fluororesin can be contained with respect to 100 parts by weight of the rubber to be impregnated into the tooth cloth. There was a problem that the improvement of the tooth chipping property was not sufficient.

Further, in the V-belts and V-ribbed belts for power transmission for general industrial use and automobiles, in order to prevent abrasion between the back surface of the belt and the pulley and generation of abnormal noise,
It has a structure in which a fabric made of fiber fabric is attached to the back surface of the belt. Also in this case, it is desired to improve the wear resistance and reduce the abnormal noise by reducing the friction coefficient of the fiber woven fabric like the toothed belt.
No effective measures were proposed.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a toothed belt in which the tooth surface of a belt body formed of a rubber compound is coated with a fiber woven fabric. An object of the present invention is to provide a toothed belt that contributes to the improvement of belt life by reducing the frictional resistance of the fabric for a long period of time.

[0008]

[Means for Solving the Problems] That is, claim 1 of the present application
The invention described is a toothed belt having a plurality of tooth portions arranged at a predetermined interval along a longitudinal direction and a back portion in which a core wire is embedded, and a toothed belt in which the surface of the tooth portion is covered with tooth cloth, After impregnating the untreated fiber fabric with the first treatment liquid of the resorcin-formalin-rubber latex treatment liquid and drying it, further impregnating it with the second treatment liquid consisting of rubber paste containing carbon nanotubes and drying it to attach the coated rubber layer It is a toothed belt in which these are integrated by vulcanization and pressurization. By including carbon nanotubes in the coat rubber layer, abrasion of the tooth portion of the toothed belt can be protected and a low friction coefficient can be maintained for a long period of time.

The invention according to claim 2 of the present application is a toothed belt in which the carbon nanotubes are added in an amount of 30 to 200 parts by weight based on 100 parts by weight of a rubber compound of a rubber paste. It can protect against wear and maintain a low coefficient of friction for a long time.

The invention according to claim 3 of the present application is the resorcin-
The formalin-rubber latex treatment liquid has a toothed belt in which a powdered antifriction material containing a fluororesin powder is dispersed in a first treatment liquid, and a large amount of the fluororesin powder is used as a resin component which is an initial condensation product of resorcin-formalin. It can be focused on or near the surface of the fiber woven fabric via the solid content of rubber latex, and can further protect the wear of the toothed belt that is in constant contact with the metal pulley and maintain a low friction coefficient for a long period of time. .

In the invention according to claim 4 of the present application, the fluororesin powder is polytetrafluoroethylene, polytrifluoroethylene, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkoxyethylene copolymer, a tetrafluoroethylene. It is at least one selected from fluoroethylene-ethylene copolymers.

According to a fifth aspect of the present invention, a tooth having a plurality of tooth portions arranged at a predetermined interval along the longitudinal direction and a back portion in which a core wire is embedded, and the tooth surface is covered with tooth cloth. In the attached belt, the untreated fiber fabric as the tooth cloth is impregnated with a first treatment liquid in which at least carbon nanotubes are dispersed in a resorcin-formalin-rubber latex treatment liquid and dried to dry the carbon nanotubes between the front and back surfaces of the fiber fabric and between the fibers. After being bundled, further impregnated with a second treatment liquid consisting of rubber paste, dried and attached with a coat rubber layer, these are integrated in a toothed belt by vulcanization and pressurization, and a large amount of carbon nanotubes are present in the initial stage of resorcin-formalin. It can be focused on or near the surface of the fiber woven fabric through the resin component, which is a condensate, and the solid component of rubber latex, and the abrasion of the tooth part of the toothed belt can be maintained. And, it is possible to maintain a low coefficient of friction to long term.

In the invention according to claim 6 of the present application, the surface of the coated rubber layer of the second treatment liquid is impregnated with a third treatment liquid in which a powdered antifriction material other than carbon nanotubes is further added to the rubber paste, and then dried. This is a toothed belt in which an outer rubber layer is attached and these are integrated by vulcanization and pressurization.

According to a seventh aspect of the present invention, the powdered lubricant other than carbon nanotubes is graphite, molybdenum disulfide, glass beads, ceramic powder, spherical phenol resin powder and aramid, polyamide, polyester, polybenzoxazole, fiber. It is at least one kind selected from the cut yarn or powder of.

The invention according to claim 8 of the present application is a toothed belt in which an isocyanate compound or an epoxy compound is added to the rubber paste of the second treatment liquid, and further improving the adhesion between the treated fiber fabric and the belt body. You can

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The toothed belt of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a treated fiber woven fabric coated on the tooth surface of a toothed belt, and FIG. 2 is a perspective view showing the structure of the toothed belt.

In FIG. 2, the toothed belt A has a plurality of tooth portions 3 arranged at predetermined intervals along the longitudinal direction, a back portion 2 continuous with the tooth portions 3, and a core wire 1 embedded in the back portion 2. Tooth 2
And a tooth cloth 4 coated on the surface of the. The back portion 2 and the tooth portions 3 form a belt body formed of the rubber compound 9. Further, the fibrous woven fabric that is the tooth cloth 4 is formed by using a fibrous woven fabric formed by weaving a weft yarn 7 extending in the longitudinal direction of the belt and a warp yarn 8 extending in the width direction of the belt as a base material.

In this embodiment, however, the fiber woven fabric forming the tooth cloth 4 is first treated by the following method.

(1) After impregnating the fiber woven fabric with the first treatment liquid of the resorcin-formalin-rubber latex (RFL) treatment liquid, the amount of the first treatment liquid adhered is adjusted by passing between a pair of pressure rolls. Then, it heat-drys at 150-200 degreeC for 1-3 minutes. Further, a rubber paste in which carbon nanotubes are dispersed can be attached. In the example of FIG. 1, the carbon fiber and the rubber compound of the same kind as the belt body are dissolved in a solvent such as methyl ethyl ketone (MEK) or toluene, and the fiber fabric is impregnated and adhered to the mixed first rubber paste. The adhesion amount of the first rubber paste is adjusted by passing between the pressure rolls. Then, it is heat-dried at 150 to 180 ° C. for 1 to 3 minutes to be impregnated with a second treatment liquid made of rubber paste containing the first rubber layer 5 (coat rubber layer) and dried. The first rubber paste may contain an isocyanate compound.

The treated tooth cloth 4 thus obtained has a rubber component 21 and a resin-based adhesive component so that the fluororesin powder is converged between the fibers on the front and back surfaces of the fiber woven fabric obtained by weaving the weft yarns 7 and the warp yarns 8. A mixture 26 consisting of 22 is impregnated and formed.

The rubber component 21 is a rubber solid obtained by heating and drying rubber latex, and the resin-based adhesive component 22.
Is an initial condensate of resorcin and formalin. The rubber component 21 and the resin-based adhesive component 22 are solid contents remaining after drying and heating the RFL treatment liquid.

The resinous adhesive component 22 adheres to the fibers of the weft yarn 7 and the warp yarn 8. Further, carbon nanotubes 23 are dispersed and mixed in a matrix composed of the rubber component 21 and the resin-based adhesive component 22.

The carbon nanotube is a cylindrical material made of only carbon atoms having a diameter of about 0.5 to 10 nm and a length of 0.5 to 10 μm, and is a multi-layer or a single layer. Carbon nanotube is a rubber compound of rubber paste 10
30 to 200 parts by weight is added to 0 parts by weight. It is preferable to increase the amount of carbon nanotubes added.

The RFL treatment liquid is a mixture of an initial condensate of resorcin and formalin and rubber latex, and in this case, the molar ratio of resorcin and formalin is 3 /.
It is preferable to set it to 1/3 in order to enhance the adhesive force. Further, the initial condensate of resorcin and formalin is mixed with rubber latex such that the resin content is 5 to 50 parts by weight with respect to 100 parts by weight of the rubber content of the rubber latex, and the total content of the fluororesin powder is included. Solid concentration 10
Adjust to ~ 40% concentration.

The rubber latex forming the rubber component 21 includes styrene-butadiene-vinylpyridine terpolymer (VP) and styrene-butadiene copolymer (SB).
R), chloroprene (CR), acrylonitrile butadiene copolymer (NBR), hydrogenated NBR (H-NB
R), chlorosulfonated polyethylene (CSM), natural rubber and the like, or one or more blends thereof are used.

(2) After impregnating the fiber woven fabric with the RFL treatment liquid in the first treatment liquid of the powdery antifriction material containing the fluororesin powder,
The adhesion amount of the first processing liquid is adjusted through a pair of pressure rolls. Then, it heat-drys at 150-200 degreeC for 1-3 minutes. Further, a rubber paste in which carbon nanotubes are dispersed can be attached.

The fluororesin powder may be polytetrafluoroethylene, polytrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkoxyethylene copolymer, tetrafluoroethylene-ethylene copolymer. It is more than one kind of coalescence. The greater the number of fluorine atoms in the fluororesin powder, the greater the effect of reducing the friction coefficient. for that reason,
Assuming that the same amount of fibers is attached to the fiber fabric, polytetrafluoroethylene has the largest effect of reducing the friction coefficient among the fluororesin powders and has a long tooth-breaking life. However, other fluororesins also have the effect in almost proportion to the ratio of the number of fluorine atoms in the molecule.

Such a fluororesin powder is the above-mentioned RFL.
30 to 200 with respect to 100 parts by weight of the rubber component in the treatment liquid
Parts by weight (more preferably 50 to 200 parts by weight),
It is necessary to make the treatment liquid uniformly dispersed. Further, the fiber woven fabric is dipped in the treatment liquid and dried, and the solid mixture containing the fluororesin powder is 5 to 5 times the weight of the fiber woven fabric before the dipping.
It is preferable to adjust the amount to be 40%.
When the amount of the fluororesin powder is less than 30 parts by weight or less than 5%, the total amount of the fluororesin powder entangled in the fiber woven fabric is small, and it becomes difficult to recognize the friction coefficient reducing effect. If the amount of the fluororesin powder is more than 300 parts by weight or more than 40%, the total amount of the fluororesin powder entangled in the fiber woven fabric is too large, the adhesiveness of the fiber woven fabric to the belt main body is deteriorated, and the belt performance is deteriorated. You

(3) After the fiber fabric is impregnated with the first treatment liquid in which the carbon nanotubes are dispersed in the RFL treatment liquid, the amount of the first treatment liquid adhered is adjusted by passing between the pair of pressure rolls. Then, it heat-drys at 150-200 degreeC for 1-3 minutes. Further, it is impregnated with a second treatment liquid composed of rubber paste and dried to attach a coat rubber layer.

The method for measuring the amount of the carbon nanotubes attached to the fiber material is as follows. The weight of the fiber woven fabric before the dipping treatment is weighed to measure the weight (W1), and then the fibers are added to the RFL treatment liquid in which the carbon nanotubes are dispersed. Immerse the fabric, then put the fabric in an oven and continue to dry until the mass is constant, measure the final mass (W2), and use the formula ((W2-W1) /
It is a method of calculating W1) × 100 (%).

(4) The fiber woven fabric is impregnated with the first treatment liquid in which carbon nanotubes are dispersed in the RFL treatment liquid, and then the adhesion amount of the first treatment liquid is adjusted by passing between the pair of pressure rolls. Then, it is heated and dried at 150 to 200 ° C. for 1 to 3 minutes, further impregnated with a second treatment liquid composed of rubber paste and dried to form a coat rubber layer, and further, on the surface of the coat rubber layer,
The outermost rubber layer is attached by impregnating a third treatment liquid in which a powdered antifriction material other than carbon nanotubes is added to rubber paste and drying.

As the powdery lubricant other than carbon nanotubes, graphite having a layered structure, molybdenum disulfide, glass beads, ceramic powder, spherical phenol resin powder and aramid, polyamide, polyester, polybenzoxazole, fiber cut yarn or One or more types of powder can be exemplified. In particular, graphite is well compatible with the rubber component and further improves the durability of the belt. This addition amount is 50 with respect to 100 parts by weight of the rubber component of the rubber compound.
It is preferably 400 parts by weight.

(5) The fiber woven fabric is impregnated with the first treatment liquid in which the carbon nanotubes are dispersed in the RFL treatment liquid, and then the amount of the first treatment liquid attached is adjusted by passing between the pair of pressure rolls. After that, it is heated and dried at 150 to 200 ° C. for 1 to 3 minutes, and a rubber compound of the same type as the belt body to which an isocyanate compound or an epoxy compound is further added is dissolved in a solvent such as methyl ethyl ketone (MEK) and toluene, and mixed rubber. Impregnated with a second treatment liquid consisting of glue, 150-180
Form a coated rubber layer by heating and drying at ° C for 1-3 minutes,
Further, the outermost rubber layer is adhered to the surface of the above-mentioned coated rubber layer by impregnating it with a third treatment liquid prepared by adding a powdered antifriction material other than carbon nanotubes to rubber paste and heating and drying at 80 to 150 ° C for 1 to 3 minutes. To do.

The isocyanate compound used here is
It is intended to improve the adhesive force between a fiber woven fabric which has been subjected to a fluororesin powder adhesion treatment and a belt body, and specific examples thereof include 4,4′-diphenylmethane diisocyanate, tolylene 2,4-diisocyanate and polymethylene polyphenyl diisocyanate. , Hexamethylene diisocyanate, polyaryl polyisocyanate (for example, PAPI is a trade name) and the like. This isocyanate compound is also used as a mixture with an organic solvent such as toluene or methyl ethyl ketone. Further, a blocked polyisocyanate obtained by blocking the isocyanate group of polyisocyanate by reacting the above isocyanate compound with a blocking agent such as phenols, tertiary alcohols and secondary alcohols can also be used.

Examples of epoxy compounds include polyhydric alcohols such as ethylene glycol, glycerin and pentaerythritol, reaction products of polyalkylene glycols such as polyethylene glycol and halogen-containing epoxy compounds such as epichlorohydrin, resorcin, Bis (4-hydroxyphenyl) dimethylmethane, phenol. Formaldehyde resin, resorcin.
It is a reaction product with a polyhydric phenol such as formaldehyde resin or a halogen-containing epoxy compound. The epoxy compound is used as a mixture with an organic solvent such as toluene or methyl ethyl ketone.

The method for producing a toothed belt is as follows. The treated fiber woven fabric is formed into a cylindrical shape by sewing and is inserted into a mold having groove portions and ridge portions alternately, and then a core wire made of a cord. Is spun on, and the unvulcanized rubber sheet forming the belt body is wound on it. Then, after covering with a jacket, it is transferred to a vulcanization process. At the time of vulcanization, an unvulcanized rubber sheet is poured into the groove portion together with the fiber woven fabric, and the treated fiber woven fabric is vulcanized integrally with the belt main body to produce a belt sleeve. After removing the vulcanized belt sleeve from the mold, attach it to the two shafts of the cutting machine,
While applying tension and rotating, a toothed belt is produced by cutting with a cutter to a predetermined width.

The weft threads 7 and the warp threads 8 of the tooth cloth 4 and the cover canvas 30
As a material of the fiber woven fabric forming the above, any of nylon, aramid, polyester, polybenzoxazole, cotton, etc., or a combination thereof can be adopted. The form of the fiber may be either a filament yarn or a spun yarn, and may be a single-composition twisted yarn, a mixed-twisted yarn, or a mixed-spun yarn. It is preferable to use fibers having a thickness such that the fluororesin powder 23, the rubber component 21 and the resin-based adhesive component 22 of the mixture 24 can be impregnated between the fibers. For toothed belts, nylon or
Aramid or the like is used.

The twill weave, satin weave, plain weave, etc. can be used in a large amount of carbon nanotubes and fluororesin powder. In order for the mixture of carbon nanotubes and fluororesin powder to effectively impregnate and adhere to the front and back surfaces and the inside of the fiber woven fabric, to the extent that the mixture is in communication with each other on the front and back surfaces and inside of the fiber woven fabric,
Select the thread thickness and density.

In the case of a toothed belt for automobiles, when the environment for use is a high temperature of 100 ° C. or more and a long life of 150,000 km or more is required, H-NBR is used for the belt body. The RFL processing liquid that is impregnated and adhered contains H-
Longevity can be achieved using conventional blends of NBR and CSM latex and VP latex. On the other hand, in a general industrial V-belt, where natural rubber and SBR are used in the belt body, the RFL treatment liquid impregnated and coated on the back cloth that covers the back of the belt includes VP latex, SBR latex and these. Blends of can be used.

There is no particular limitation on the material of the rubber compound forming the belt body, and an appropriate material is appropriately selected according to the use conditions. In the case of toothed belts for automobile engines and various engines, H-NB with heat resistance and oil resistance
R, CR, CSM, etc. are used. In addition to H-NBR, CR, CSM, NBR, ethylene propylene diene monomer (EP
DM), ethylene propylene copolymer (EPR), SB
Any of R, isoprene rubber (IR), natural rubber (NR), fluororubber, silicone rubber and the like can be used.
In the case of such a toothed belt, the use of the tooth cloth described in FIG. 1 is effective.

There is no limitation on the core wire 1 embedded inside the belt body, and glass core wire and aramid core wire are generally used. In addition, polybenzoxazole, polyparaphenylene naphthalate, polyester, acrylic,
Any twisted cord composed of carbon or steel can be used. The composition of the glass core wire may be either E glass or S glass (high strength glass), and is not limited to the thickness of the filament, the number of filaments converged, and the number of strands. Further, it is not limited to an adhesive treatment agent, a sizing agent used as a protective material for a glass filament at the time of bending, an RFL, an overcoat agent and the like. On the other hand, the aramid core wire is not limited by the difference in the molecular structure of the material, the core wire configuration, the size of the filament, and the adhesive treatment agent. Similarly, there is no special restriction on the twisted cord of the core wire made of other composition.

[0042]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the examples and can be modified as appropriate without departing from the object.

Table 1 shows a coating fiber woven fabric having the composition and constitution, Table 2 shows a rubber compound, Table 3 shows an RFL treatment liquid (first treatment liquid), and Table 4 shows a rubber paste (second treatment). Treatment liquid), and Table 5 shows the prepared rubber paste (third treatment liquid).

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

[Table 3]

[0047]

[Table 4]

[0048]

[Table 5]

Example A The fiber materials shown in Table 1 were immersed in an RFL treatment solution, dried at 120 ° C., and then heat-treated at 180 ° C. for 2 minutes. Next, Table 4
A rubber layer was formed in the order of Table 5 to Table 5 to obtain a treated fiber material (tooth cloth) for coating the belt body.

Next, the above-mentioned tooth cloth was wound around a belt-making mold, and the core wire (glass fiber, 1.2 mm diameter) bonded with RFL of a pair of SZ twists and isocyanate in Table 6 was used at a constant pitch ( 1.4mm) and spirally wound with a constant tension, and the composition of Table 2 on it 2.5mm
I stuck the rubber sheet. Further, after placing in a vulcanizer and forming a tooth profile by a normal press-fitting method, the tooth profile is 3 at 160 ° C.
After vulcanization under pressure for 0 minutes, the back surface of the belt was ground to a certain thickness and cut into a certain width to obtain a toothed belt.

[0051]

[Table 6]

The size of the produced belt has a belt width of 15
mm, belt tooth profile Y (8.0 mm pitch), number of teeth 105
And is usually displayed as 105Y15. As a running test device, the number of drive pulley teeth is 19, the number of driven pulley teeth is 38, the drive pulley rotation speed is 7200 rpm, and the driven pulley load is 7.
5 kW, initial tension 350 N, ambient temperature 130 ℃
The durability running test under the high load, high tension, and high temperature conditions set to was carried out. Table 7 shows the life time and failure mode in the durability test together with the belt configuration.

[0053]

[Table 7]

As a result, it can be seen that in the example, when the rubber paste containing the carbon nanotubes was used, the high load running life time was significantly extended as compared with the comparative example 1.

[0055]

According to the toothed belt of the present invention, as the tooth cloth, the untreated fiber woven fabric is impregnated with the first treatment liquid of the RFL treatment liquid, dried, and further subjected to the second treatment consisting of a rubber paste containing carbon nanotubes. After the liquid is impregnated and dried to attach the coat rubber layer, these are integrated by vulcanization and pressurization, and the untreated fiber fabric is impregnated with the first treatment liquid in which at least carbon nanotubes are dispersed in the RFL treatment liquid and dried to obtain carbon. The nanotubes are bundled on the front and back surfaces of the fiber woven fabric and between the fibers, further impregnated with a second treatment liquid made of rubber paste, dried to attach a coat rubber layer, and then these are integrated by vulcanization and pressurization in a toothed belt. By including carbon nanotubes in the coated rubber layer, it is possible to protect the wear of the tooth part of the toothed belt and maintain a low friction coefficient for a long time. A.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a structure of a main part of a toothed belt obtained by a manufacturing method of the present invention.

FIG. 2 is a perspective view showing the overall structure of a toothed belt obtained by the manufacturing method of the present invention.

[Explanation of symbols]

1 core wire 2 back 3 teeth 4 tooth cloth 5 First rubber layer 6 Second rubber layer 7 Weft 8 warp 9 rubber compound 11,12 boundary surface 21 Rubber component 22 Resin adhesive components 23 carbon nanotubes 24 mixture

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D06M 13/11 D06M 15/59 13/395 15/693 15/256 B29D 29/08 15/41 D06M 15 / 507 15/507 11/04 L 15/59 11/00 Z 15/693 // B29D 29/08 F term (reference) 4F213 AA44 AB18 AB21 AD05 AD16 AD34 AG17 WA03 WA15 WA34 WA37 WA38 WA39 WA43 WA52 WA53 WA54 WA57 WA60 WA63 WA85 WA87 WA92 WB01 WB11 WB21 WC03 WE01 WE06 WE09 WE16 WE21 WF01 WF05 WF06 WF23 WK03 WW06 WW15 WW21 WW23 WW33 4L031 AA20 AA21 AA22 AB32.

Claims (8)

[Claims] 1. A toothed belt having a plurality of tooth portions arranged at a predetermined interval along a longitudinal direction and a back portion in which a core wire is embedded, and a tooth belt in which a surface of the tooth portion is covered with tooth cloth, After impregnating the untreated fiber fabric with the first treatment liquid of the resorcin-formalin-rubber latex treatment liquid and drying it, further impregnating it with the second treatment liquid consisting of rubber paste containing carbon nanotubes and drying it to attach the coated rubber layer A toothed belt characterized by integrating these by vulcanization and pressurization. 2. The toothed belt according to claim 1, wherein the carbon nanotubes are added in an amount of 30 to 200 parts by weight based on 100 parts by weight of the rubber compound of the rubber paste. 3. The toothed belt according to claim 1, wherein a powdered antifriction material containing a fluororesin powder is dispersed in the first treatment liquid of the resorcin-formalin-rubber latex treatment liquid. 4. The fluororesin powder is polytetrafluoroethylene, polytrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkoxyethylene copolymer, tetrafluoroethylene-ethylene copolymer. The toothed belt according to claim 3, which is at least one selected from the group consisting of: 5. A toothed belt having a plurality of tooth portions arranged at a predetermined interval along a longitudinal direction and a back portion in which a core wire is embedded, and a tooth belt in which a surface of the tooth portion is covered with tooth cloth. The untreated fiber woven fabric is impregnated with a first treatment liquid in which at least carbon nanotubes are dispersed in a resorcin-formalin-rubber latex treatment liquid and dried to focus the carbon nanotubes on the front and back surfaces of the fiber woven fabric and between the fibers. A toothed belt characterized in that after being impregnated with the second treatment liquid and dried, a coat rubber layer is attached, these are integrated by vulcanization and pressurization. 6. The outermost rubber layer is adhered to the surface of the coated rubber layer of the second treatment liquid by impregnating it with a third treatment liquid in which a powdered antifriction material other than carbon nanotubes is further added to rubber paste, and drying. The toothed belt according to claim 5, wherein these are integrated by vulcanization and pressurization. 7. A powdered antifriction material other than carbon nanotubes is graphite, molybdenum disulfide, glass beads,
At least one selected from ceramic powder, spherical phenol resin powder and aramid, polyamide, polyester, polybenzoxazole, fiber cut yarn or powder.
The toothed belt according to claim 6, which is a seed. 8. The isocyanate compound or the epoxy compound is added to the rubber paste of the second treatment liquid.
The toothed belt described.