JP3356717B2 - Method of manufacturing power transmission belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a power transmission belt, in which the whole or a part of the surface of a belt body formed of a rubber compound is covered with a fiber material such as a fiber fabric, and the friction resistance of the fiber material is reduced. The present invention relates to a method for manufacturing a power transmission belt in which is reduced over a long period of time to improve the life of the belt.

[0002]

2. Description of the Related Art Toothed belts that simultaneously drive camshafts of automobile engines and auxiliary equipment such as injection pumps, oil pumps, water pumps, etc., are subject to the use conditions associated with high engine output and compact engine rooms. Has become more severe, and further improvement in durability has been demanded. Similarly, a toothed belt used for a general industrial machine is required to extend a belt replacement cycle.

[0003] Such failure modes of the toothed belt are roughly classified into cutting of the belt due to fatigue of the cord, and chipping due to overload and wear of the cloth. For cutting due to core fatigue,
Use of aramid core wire or small-diameter core wire of high-strength glass, use of hydrogenated nitrile rubber (H-NBR) compound with excellent heat resistance, and keep the belt tension constant during startup and running as an improvement on the engine side. It has been improved by using an auto tensioner and the like, and the occurrence of cutting failure has been reduced.

[0004] However, with respect to the occurrence of tooth chipping, although measures such as the use of tooth cloth using high-strength nylon 6-6 or aramid fiber have been taken, they are still insufficient. Therefore, in order to further improve the chipping resistance of the toothed belt coated with the tooth cloth, it is considered effective to reduce the friction coefficient of the tooth cloth surface. EP 0 662 571 B1 proposes a toothed belt in which a polymer matrix layer containing a fluorine resin is coated by spraying or coating on the outside of a woven fabric layer of a tooth cloth. This fluororesin is bound without a boundary layer in a special polymer matrix. Then, the polymer matrix is bonded to the tooth cloth. However, since the fluororesin is firmly bonded to the polymer matrix, the fluororesin remains surrounded by the matrix, and there has been a problem that the effect of reducing the friction coefficient by the fluororesin cannot be sufficiently exhibited. Also, due to material limitations of the polymer matrix,
There is a problem that the amount of the fluororesin that can be contained is small, the thickness of the polymer matrix layer is also reduced, and the improvement in tooth chipping resistance by the fluororesin is not sufficient.

In Japanese Patent Application Laid-Open No. Hei 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 applied to a rubber layer of a belt body via an adhesive layer. Coupling toothed belts have been proposed. The reason why the fluororesin in the rubber mixture is converted into a fiber by a kneading step or the like is to prevent the fluororesin in the rubber mixture from becoming foreign matters and reducing the strength of the rubber mixture. However, there is a problem that the fluororesin fiberized in the rubber mixture has few opportunities to be exposed on the friction surface, and the effect of reducing the friction coefficient by the fluororesin is not sufficient. Further, in order to maintain the strength without converting the fluororesin into fibers to form foreign substances, only about 1 to 30 parts by weight of the fluororesin can be contained with respect to 100 parts by weight of the rubber impregnated in the tooth cloth. There is a problem that the improvement of the tooth chipping property is not sufficient.

In V-belts and V-ribbed belts for power transmission for general industrial use and automobiles, in order to prevent abrasion between the belt back surface and the pulley and generation of abnormal noise,
The structure is such that a woven fabric made of a fiber material is attached to the back of the belt. In this case as well, it is desired to improve the abrasion resistance and reduce abnormal noise by reducing the coefficient of friction of the fiber woven fabric as in the case of the toothed belt.
No effective measures have been proposed.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is directed to a rubber belt in which all or a part of the surface of a belt body formed of a rubber compound is coated with a fiber material. The fiber material contains a large amount of a powdered anti-friction material containing at least a fluororesin powder in a form in which the effect of reducing the friction coefficient is easily exhibited, thereby reducing the friction resistance of the fiber material over a long period of time and improving the life of the belt. It is an object of the present invention to provide a method of manufacturing a driven power belt.

[0008]

According to the present invention, a resin material-based adhesive component, a rubber component,
Impregnating and adhering a mixture with at least a powdered lubricant containing a fluororesin powder to bind the powdered lubricant to the front and back surfaces of the fibrous material and between the fibers so that a large amount of the powdered lubricant is contained. In particular, the present invention has been completed with the knowledge that the opportunity to expose the fluororesin powder to the friction surface increases, and the effect of reducing the friction coefficient by the fluororesin powder can be surely exerted.

That is, the invention according to claim 1 of the present application is directed to a method of manufacturing a power transmission belt in which all or a part of the surface of a belt body formed of a rubber compound is coated with a fibrous material. A formalin-rubber latex treatment liquid is added with a powdered lubricant containing at least a fluororesin powder, impregnated into a first treatment liquid dispersed and dried,
After the reducer friction material was focused between the front and back surfaces and the fibers of the fiber material, and impregnating the second treatment liquid composed of a rubber cement dry adhering the unvulcanized rubber layer, further the fluororesin rubber cement Powder or
Is the third process in which a powdered lubricant other than fluororesin powder is added.
Impregnated with physical liquid, dried and adhered unvulcanized outermost rubber layer
In the method for producing a power transmission belt obtained by vulcanizing the obtained treated fiber material integrally with the belt body, a large amount of fluororesin powder is used to reduce the resin content of the initial condensate of resorcinol-formalin and the solid content of rubber latex. The fiber material can be focused on or near the surface of the fiber material, thereby protecting the treated fiber material from wear and maintaining a low coefficient of friction for a long time. Then, add an antifriction material to the outermost coat rubber layer.
By the, to protect the wear of more processing fiber 維材fees, low
The coefficient of friction can be maintained for a long time.

According to a second aspect of the present invention, there is provided a power transmission belt having a plurality of teeth arranged at predetermined intervals along a length direction and a back portion having a core wire embedded therein, and a fiber is provided on the surface of the teeth. It is a toothed belt coated with a material, and the life of the belt can be prolonged by using a fiber material subjected to the above treatment.

According to the third aspect of the present invention, an isocyanate compound or an epoxy compound is added to the rubber paste of the second treatment liquid, so that the adhesion between the fiber material and the belt body can be further improved.

According to a fourth aspect of the present invention, the fluororesin powder is used in an amount of 30 to 30 parts by weight based on 100 parts by weight of a rubber latex solid content of a resorcin-formalin-rubber latex treatment liquid.
A method for manufacturing a power transmission belt in which 200 parts by weight is added and the particle diameter is 100 μm or less.

The invention according to claim 5 of the present application resides in a method for producing a power transmission belt in which the fluororesin powder is an aqueous dispersion, whereby the fluororesin powder can be uniformly added to the resorcinol-formalin-rubber latex treatment liquid. it can.

According to a sixth aspect of the present invention, there is provided the first treatment liquid, wherein the fluororesin powder is polytetrafluoroethylene, polytrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkoxyethylene. It is at least one selected from a copolymer and a tetrafluoroethylene-ethylene copolymer.

[0015]

The invention according to claim 7 of the present invention is characterized in that the powdered lubricant is made of graphite, molybdenum disulfide, glass beads, ceramic powder, spherical phenol resin, aramid, polyamide, polyester, polybenzoxazole, polyparaphenylene naphthalate. It is at least one selected from cut yarn or powder.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A toothed belt obtained by the manufacturing method of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged sectional view of a fiber material (tooth cloth) coated on the tooth surface of the toothed belt, and FIG. 2 is a perspective view showing the structure of the toothed belt.

In FIG. 2, a toothed belt A has a plurality of teeth 3 arranged at predetermined intervals along a longitudinal direction, a back 2 continuous with the teeth 3, a core wire 1 embedded in the back 2, and Tooth part 2
And a tooth cloth 4 coated on the surface of the tooth cloth. The back 2 and the teeth 3 constitute a belt body formed of the rubber compound 9. Further, the tooth cloth 4 is configured using a fiber woven fabric formed by weaving a weft 7 extending in the longitudinal direction of the belt and a warp 8 extending in the width direction of the belt. Needless to say, the above-mentioned fiber materials include knitted and non-woven fabrics in addition to woven fabrics.

The V-ribbed belt B shown in FIG. 3 has a stretched portion 32 made of a cover canvas 30 made of a fiber material, a cushion rubber layer 33 in which a cord 41 made of a cord is embedded, and a compression layer which is an elastic layer below the cushion rubber layer 33. It consists of a part 36. The compression section 36 has a plurality of trapezoidal ribs 37 and a groove section 38 extending in the belt longitudinal direction and having a substantially triangular cross section.

The V-ribbed belt or V-belt has a structure in which a treated fiber material is coated on the back and periphery of a belt body made of a rubber compound, and a pulley is rolled on the fiber material. In this way, the treated fiber material is coated on the power transmission surface and / or the back surface of the belt, and is coated on the entire front and back surfaces or a part of the belt body.

In this embodiment, first, the fiber material constituting the tooth cloth 4 and the cover canvas 30 is firstly treated by adding a fluororesin powder to a resorcinol-formalin-rubber latex (RFL) treatment liquid and dispersing it. After the impregnation with the liquid, the amount of the first processing liquid adhered is adjusted through a pair of pressure rolls. Then, it heat-drys at 150-200 degreeC for 1-3 minutes.

The treated tooth cloth 4 thus obtained is made up of a rubber component 21 and a resin-based adhesive component so that the fluororesin powder is bound between the front and back surfaces of the fiber material formed by weaving the weft 7 and the warp 8 and between the fibers. Mixture 2 consisting of 22 and fluororesin powder 23
4 is formed by impregnation.

The rubber component 21 is a rubber solid obtained by heating and drying a rubber latex.
Is the precondensate of resorcinol and formalin. The rubber component 21 and the resin-based adhesive component 22 are solids remaining after the RFL treatment liquid is dried and heated.

The resin adhesive component 22 adheres to the fibers of the weft 7 and the warp 8. Further, a fluororesin powder 23 is dispersed and mixed in a matrix composed of the rubber component 21 and the resin-based adhesive component 22. Then, the fluororesin powder 23 is not bonded to the rubber component 21 and the resin-based adhesive component 22, and a gap is formed around or all around the fluororesin powder 23.

The RFL treatment liquid is a mixture of an initial condensate of resorcinol and formalin and a rubber latex. In this case, the molar ratio of resorcinol to formalin is 3 /
It is preferable to make it 1 to 1/3 in order to increase the adhesive strength. The initial condensate of resorcinol and formalin is mixed with rubber latex so that the resin content is 5 to 50 parts by weight with respect to 100 parts by weight of rubber of rubber latex. Solid concentration of 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)
One or more blends of R), chlorosulfonated polyethylene (CSM), natural rubber and the like are used.

The aforementioned rubber component 21 and resin-based adhesive component 2
Fluororesin powder 23 that is not bonded to 2 is polytetrafluoroethylene, polytrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer,
At least one of a tetrafluoroethylene-perfluoroalkoxyethylene copolymer and a tetrafluoroethylene-ethylene copolymer. The greater the ratio of the number of fluorine atoms in the fluororesin powder 23, the greater the effect of reducing the coefficient of friction. Therefore, assuming the same amount of adhesion to the fiber material,
Among the fluororesin powders 23, polytetrafluoroethylene is the most effective in reducing the coefficient of friction and has a long toothless life. However, other fluororesin powders also have the effect almost in proportion to the ratio of the number of fluorine atoms in the molecule.

Such a fluororesin powder 23 is made of the R
30 to 2 parts by weight per 100 parts by weight of the rubber component in the FL treatment liquid
It is necessary to add 00 parts by weight (more preferably 50 to 200 parts by weight) to obtain a uniformly dispersed treatment liquid. Also,
The fiber material is immersed in the treatment liquid and dried, and a solid mixture 2 containing a fluororesin powder is added to the weight of the fiber material before immersion.
It is preferable to adjust the amount of No. 4 to be 5 to 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 material is small, and the effect of reducing the friction coefficient is hardly recognized. If the amount of the fluororesin powder exceeds 300 parts by weight or exceeds 40%, the total amount of the fluororesin powder entangled in the fiber material is too large, and the adhesion of the fiber material to the belt body or the like is reduced, and the belt performance is reduced. You.

In the present invention, a powdered lubricating material other than the following fluororesin powder can be used together with the fluororesin powder 23. In this case, the powdery anti-friction material is R
30 to 2 parts by weight per 100 parts by weight of the rubber component in the FL treatment liquid
00 parts by weight, and it is preferable to increase the addition amount of the fluororesin powder. However, there is no particular limitation on the mixing ratio of the fluororesin powder and the powdered lubricant.

The amount of the mixture adhering to the fiber material is measured by weighing the mass of the fiber material before the immersion treatment, measuring the mass (W1), and then RF-dispersing the fluororesin powder.
The fiber material is immersed in the L treatment liquid, and then the fiber material is placed in an oven and dried until the weight becomes constant.
2), and the equation ((W2−W1) / W1) × 100
(%).

In order to entangle a large amount of the fluororesin powder 23 into the interior of the fiber material, it must be pulverized by pulverization or granulation, and its average particle diameter is reduced to 100 μm or less (more preferably 10 μm or less). Use the new one. If the thickness exceeds 100 μm, the fluororesin powder settles in the RFL treatment liquid, making it difficult to uniformly disperse it. Further, the surface area of the fluororesin powder in the mixture is reduced, and the effect of reducing the friction coefficient is reduced. From such a viewpoint, the fluororesin powder preferably has a particle size as small as possible, for example, 10 μm or less.

A rubber paste can be further attached to the fiber material to which the fluororesin powder has been attached. In the example of FIG. 1, the above-mentioned fiber material was dissolved in a solvent such as methyl ethyl ketone (MEK) or toluene, and an isocyanate compound or an epoxy compound and a rubber compound of the same kind as the belt body were impregnated and adhered to the first rubber paste mixed. Thereafter, the amount of the first rubber glue adhered is adjusted through a pair of pressure rolls. Thereafter, the first rubber layer 5 is formed by heating and drying at 150 to 180 ° C. for 1 to 3 minutes.

The isocyanate compound used here is:
The purpose of the present invention is to improve the adhesion between the fiber material to which the fluororesin powder has been attached and the 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 by being mixed with an organic solvent such as toluene and methyl ethyl ketone. Further, a blocked polyisocyanate in which an isocyanate group of the polyisocyanate is blocked by reacting a blocking agent such as a phenol, a tertiary alcohol, or a secondary alcohol with the above isocyanate compound can also be used.

Examples of the epoxy compound include polyhydric alcohols such as ethylene glycol, glycerin and pentaerythritol, and reaction products of polyalkylene glycols such as polyethylene glycol and halogen-containing epoxy compounds such as epichlorohydrin, resorcinol, and the like. Bis (4-hydroxyphenyl) dimethylmethane, phenol. Formaldehyde resin, resorcinol.
Reaction products with polyhydric phenols such as formaldehyde resins and halogen-containing epoxy compounds. The epoxy compound is used by being mixed with an organic solvent such as toluene and methyl ethyl ketone.

Further, in the present invention, the fibrous material on which the first rubber layer 5 is formed is compounded with a fluororesin powder or a powdery anti-friction material other than the fluororesin powder in a rubber compound of the same kind as the belt body, and methyl ethyl ketone ( After dissolving in a solvent such as MEK) and toluene, and impregnating and adhering the mixed second rubber paste, the amount of the second rubber paste adhered is adjusted through a pair of pressure rolls. After that, it is dried by heating at 80 to 150 ° C. for 1 to 3 minutes to adhere the outermost second rubber layer 6.

Examples of powdered lubricants other than the above-mentioned fluororesin powder include graphite having a layered structure, molybdenum disulfide, glass beads, ceramic powder, spherical phenol resin powder and aramid, polyamide, polyester, polybenzoxazole, and fiber. One or more cut yarns or powders can be exemplified. In particular, graphite is well compatible with the rubber component, and further improves the durability of the belt.

The amount of the fluororesin powder or the powdered lubricating material other than the fluororesin powder may be adjusted according to the amount of the rubber component 100 in the rubber compound.
50 to 400 parts by weight based on parts by weight is preferred.

The method of manufacturing the toothed belt is as follows. The above-mentioned treated fiber material is machined into a cylindrical shape, inserted into a mold having alternately grooved portions and projected ridges, and then a cord made of cords. , And an unvulcanized rubber sheet forming a belt body is wound thereon. Then, after covering with a jacket, it is moved to a vulcanization process. At the time of vulcanization, the unvulcanized rubber sheet is poured into the groove along with the fiber material, and the treated fiber material is vulcanized integrally with the belt 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 rotating by applying tension, the sheet is cut to a predetermined width by a cutter to produce a toothed belt.

An example of a method for manufacturing a V-ribbed belt is as follows. First, after winding one or a plurality of treated fiber materials and a cushion rubber layer around the peripheral surface of a cylindrical forming drum, a cord made of a rope is spirally spinned on this, and further a compression rubber layer is formed. After sequentially winding to obtain a laminate, it is vulcanized to form a vulcanized sleeve. next,
The vulcanization sleeve is hung on a drive roll and a driven roll, and is run under a predetermined tension, and the rotated grinding wheel is moved so as to come into contact with the running vulcanization sleeve, and the surface of the compressed rubber layer of the vulcanization sleeve is moved. Then, a plurality of 3 to 100 groove portions are ground at one time. The vulcanization sleeve obtained in this way is removed from the drive roll and the driven roll, and the vulcanization sleeve is run while being hung on another drive roll and the driven roll,
It is cut into a predetermined width by a cutter and finished into individual V-ribbed belts.

The weft 7 and the warp 8 of the tooth cloth 4 and the cover canvas 30
Any of nylon, aramid, polyester, polybenzoxazole, cotton, or the like, or a combination thereof can be adopted as the material of the fiber material forming the above. The form of the fiber may be any of a filament yarn and a spun yarn, and may be a twisted yarn of a single composition, a mixed twisted yarn, or a mixed spun yarn. It is preferable to use fibers in which the fluororesin powder 23, the rubber component 21 and the resin-based adhesive component 22 of the mixture 24 are so thick that they can be impregnated between the fibers. In the case of a toothed belt, nylon,
Aramid or the like is used. In the case of a V-belt or a V-ribbed belt, cotton yarn or a blend yarn of cotton and polyester is usually used, but especially at a high operating temperature or a high load, polybenzoxazole fiber, polyethylene naphthalate, etc. are also used. .

The weaving structure may include a large amount of the fluororesin powder 23 in any of a twill weave, a satin weave, and a plain weave. In order for the mixture 24 in which the fluororesin powder 23 is dispersed to be effectively impregnated and adhered to the front and back surfaces and the inside of the fiber fabric, the thickness of the yarn is so large that the mixture 24 is in communication with the front and back surfaces and the inside of the fiber fabric. Select the pod density.

When a toothed belt for an automobile is used in a high temperature environment 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 treatment liquid to be impregnated and attached includes H-
Long life can be achieved using a conventional blend of NBR and CSM latex and VP latex. On the other hand, in the case of a general industrial V-belt, in which natural rubber and SBR are used for the belt body, VP latex, SBR latex and these are used in the RFL treatment liquid impregnated and coated on the back cloth that covers the belt back surface. Can be used.

The material of the rubber compound forming the belt body is not particularly limited, and an appropriate material is appropriately selected according to the use conditions. H-NB with heat resistance and oil resistance for toothed belts for automobile engines and various engines
R, CR, CSM, etc. are used. Toothed belts used for general industrial machines include NBR, ethylene propylene diene monomer (EP) in addition to H-NBR, CR, and CSM.
DM), ethylene propylene copolymer (EPR), SB
Any of R, isoprene rubber (IR), natural rubber (NR), fluorine rubber, silicon rubber and the like can be used.
In the case of such a toothed belt, the use of the tooth cloth described with reference to FIG. 1 is effective.

Also, V belts for general industries and automobiles,
CR, H-NBR, CSM, N
Rubber compounds such as R and SBR are used. Such a V
In a belt or V-ribbed belt, a back cloth is coated on the back surface. This back cloth is produced by subjecting the same cloth to RFL impregnation and adhesion treatment as that of the tooth cloth, and then treating the surface with rubber glue or rubbing or coating rubber for surface treatment with a rubber calender roll. The effect is that the life of the belt is improved by improving the abrasion due to contact with the driven pulley or idler pulley, and the noise is reduced by reducing the frictional force when the belt back contacts the pulley. It is.

There is no limitation on the core wire 1 embedded in the belt body, and generally, a glass core wire and an aramid core wire are used. In addition, polybenzoxazole, polyparaphenylene naphthalate, polyester, acrylic,
Any of twisted cords composed of carbon and 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 by the thickness of the filament, the number of converging filaments, and the number of strands. Further, the present invention is not limited to a sizing agent, an RFL, an overcoat agent, and the like used as an adhesive treatment agent and a protective material for a glass filament during bending. 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, or the adhesive treatment agent. Similarly, there is no particular limitation on the twisted cord of the core wire having another composition.

[0046]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples, and can be appropriately changed without departing from the object.

Table 1 shows the fiber fabric for coating having the composition and constitution, Table 2 shows the rubber compound, Table 3 shows the RFL treatment solution, and Table 4 shows the prepared rubber paste.

[0048]

[Table 1]

[0049]

[Table 2]

[0050]

[Table 3]

[0051]

[Table 4]

Example A The fiber materials shown in Table 1 were immersed in an RFL treatment solution containing a fluororesin powder, dried at 120 ° C., and then heat-treated at 180 ° C. for 2 minutes. Next, after dissolving the rubber compound shown in Table 2 in an organic solvent such as MEK or toluene, polyaryl polyisocyanate (trade name P)
The fiber fabric after the RFL treatment was immersed in the treatment liquid to which the (API) was added, and dried to form a first rubber layer. Table 4
20 parts by weight of Nocrack NBC (antiaging agent) are added to 100 parts by weight of the rubber compound of Table 2, and the rubber compound and Nocrack NBC are added to an organic solvent such as MEK or toluene. A treatment liquid was prepared by adding a treatment liquid having a concentration of about 15% with respect to the mixed liquid, and adding a fluorine resin, graphite, molybdenum disulfide, or the like. The fiber material having the first rubber layer formed thereon was immersed in the treatment liquid and dried to form a second rubber layer, which was used as a tooth cloth for covering the belt body.

Next, the above-mentioned tooth cloth was wound around a mold for producing a belt, and a core wire (glass fiber, 1.2 mm diameter) bonded to a pair of SZ twisted RFL and isocyanate shown in Table 5 was fixed at a constant pitch ( (1.4 mm), and spirally wound with a constant tension on the spiral.
Rubber sheet was stuck. Further, the mixture is put into a vulcanization can to form a tooth profile by a normal press-fitting method.
After pressure vulcanization for 0 minutes, the back surface of the belt was polished to a certain thickness and cut to a certain width to obtain a belt with running teeth.

[0054]

[Table 5]

The size of the produced belt was 15 belt widths.
mm, belt tooth shape Y (8.0 mm pitch), number of teeth 105
And usually displayed as 105Y15. As a traveling test device, the number of drive pulley rotations is 7200 rpm with the number of drive pulley teeth 19 and the number of driven pulleys 38, and the driven pulley load is 7.
5kW, initial tension 350N, ambient temperature 130 ° C
A high-load, high-tension, high-temperature running test was performed under the conditions set in the above. Tables 6 and 7 show the life time and failure mode in the durability test together with the belt configuration.

[0056]

[Table 6]

[0057]

[Table 7]

[0058]

[0059]

[0060]

[0061]

[0062]

In Examples 1 to 4 , a tooth cloth containing a fluororesin powder was further subjected to a rubber paste treatment in which a fluororesin powder and another friction coefficient reducing agent were added as additives to a rubber paste containing H-NBR. and are as hereinbefore, fluorine resin powder as an additive rubber cement, is made by adding molybdenum disulfide, graphite, aramid fibers powder, the effect of the belt life improvement.

For Comparative Examples 1 to 5, a set of woven fabric for tooth cloth was used.
The fabric is any fabric of aramid, polyester and PBO
However, the fluororesin powder is contained in the RFL treatment solution.
And the rubber layer of the third treatment liquid is not formed
In addition, the belt life is shorter than in Examples 1 to 4.

Example B In the same manner as in Example A, the V-belt, the V-ribbed belt, and the speed-changing V-belt were also impregnated with the RFL treatment liquid containing fluororesin powder on the back cloth coated on the back surface of each belt. It was confirmed that there was no occurrence of adhesive wear on the back of the belt, and that there was little noise.

[0066]

According to the manufacturing method of the present invention having the above-described structure, the fibrous material is impregnated with a first treatment liquid in which a fluororesin powder is added to a resorcin-formalin-rubber latex treatment liquid and dispersed, and the fiber material is dried and dried. the after focused between the front and rear surfaces and fibers of the tooth cloth, impregnated with a second treatment liquid composed of rubber cement and dried to adhere the unvulcanized rubber layer, further the rubber
Powder of fluororesin powder or powder other than fluororesin powder for glue
Impregnated with the third processing solution to which the lubricating material has been added, dried and
To adhere the outermost rubber layer of the vulcanization and vulcanize the obtained treated fiber material integrally with the belt body, a large amount of fluororesin powder is mixed with a resin component which is an initial condensate of resorcinol-formalin and rubber latex. Can be focused on or near the surface of the fibrous material via the solid content, thereby protecting the abrasion of the treated fibrous material and maintaining a low coefficient of friction for a long period of time.

[Brief description of the drawings]

FIG. 1 is an enlarged 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 entire structure of a toothed belt obtained by the manufacturing method of the present invention.

FIG. 3 is a sectional perspective view of a V-ribbed belt obtained by the manufacturing method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 core wire 2 back part 3 tooth part 4 tooth cloth 5 first rubber layer 6 second rubber layer 7 weft 8 warp 9 rubber compound 11, 12 boundary 21 rubber component 22 resin-based adhesive component 23 fluororesin powder 24 mixture

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-126974 (JP, A) JP-A-64-33275 (JP, A) JP-A-4-82970 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) B29D 29/08 F16G 1/00 F16G 1/08 D06M

Claims (7)

(57) [Claims] 1. A method for producing a power transmission belt in which the whole or a part of the surface of a belt body formed of a rubber compound is coated with a fibrous material, wherein the fibrous material is added to a resorcinol-formalin-rubber latex treatment liquid by at least fluorine. A first lubricating material containing a resin powder is added and dispersed in the first treatment liquid, and the impregnated first processing liquid is dried. The lubricating material is bundled between the front and back surfaces of the fiber material and between the fibers. It was impregnated with the treatment liquid drying and adhering the unvulcanized rubber layer, further the fluororesin to rubber cement
Add powdered anti-friction material other than grease powder or fluororesin powder
Impregnated with the added third processing solution, dried and unvulcanized
A method for manufacturing a power transmission belt, comprising: adhering a rubber layer and vulcanizing the obtained treated fiber material integrally with a belt body. 2. A fibrous material in which a power transmission belt has a plurality of teeth arranged at predetermined intervals along a length direction and a back part in which a core wire is embedded, and the surface of the teeth is subjected to the above treatment. The method for producing a power transmission belt according to claim 1, wherein the transmission belt is a toothed belt coated with a. 3. An isocyanate compound or an epoxy compound is added to the rubber paste of the second treatment liquid.
Or the manufacturing method of the transmission belt of 2. 4. The fluororesin powder is added in an amount of 30 to 200 parts by weight based on 100 parts by weight of a rubber latex solid content of a resorcinol-formalin-rubber latex treatment liquid, and the particle diameter is 100 μm or less. Or 3
A method for manufacturing the transmission belt according to the above. 5. The method according to claim 4, wherein the fluororesin powder is an aqueous dispersion. 6. The fluororesin powder of the first treatment liquid is polytetrafluoroethylene, polytrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkoxyethylene copolymer, tetrafluoroethylene -At least one selected from ethylene copolymers,
6. The method for producing a power transmission belt according to 2, 3, 4, or 5. 7. The powdered antifriction material is selected from graphite, molybdenum disulfide, glass beads, ceramic powder, spherical phenolic resin, aramid, polyamide, polyester, polybenzoxazole, polyparaphenylene naphthalate cut yarn or powder. at least one method of manufacturing a power transmission belt of claim 1 or 6, wherein the.