JP2010053909A - Driving belt and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving belt which reduces noise during belt running, improves durability, and detects a replacement timing of the belt, and also to provide a manufacturing method for the driving belt. <P>SOLUTION: A rubber sleeve 24, in which a multi-layer hair transplantation layer 26 different in a color of short length fiber is covered on a first hair transplantation layer 26a obtained by sticking the short length fiber on a surface of unvulcanized rubber, is arranged between an inner mold 41 in which a flexible jacket 42 is attached, and an outer mold 46, and a preliminary molding 21 is formed in a die section 45 of the outer mold by expanding the flexible jacket 42. Another sleeve 25 is formed in a surface of the flexible jacket 42 of the inner mold 41 separated from the outer mold 46, and this inner mold 41 is arranged again within the outer mold 46, moreover the other sleeve 25 is vulcanized integrally with the preliminary molding 21 by expanding the flexible jacket 42. The first hair transplantation layer 26a in which the short length fiber is embedded, and the multi-layer hair transplantation layer 26 which consists of the second hair transplantation layer 26b and has a different color, are formed in the belt sleeve surface by extracting air from the multi-layer hair transplantation layer 26 to the outside of the molding, and by forming a flat mold attaching section. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power transmission belt and a method for manufacturing the same, and more particularly, it has high quietness from the beginning of traveling, can maintain its effect for a long period of time, has excellent wear resistance, and can detect the replacement time of the belt. The present invention relates to a transmission belt and a manufacturing method thereof.

  Conventionally, as an auxiliary machine driving belt for automobiles, an adhesive rubber layer in which a core wire is embedded along the longitudinal direction of the belt, and a compressed rubber layer having rib portions extending in the longitudinal direction of the belt and oriented short fibers in the width direction. V-ribbed belts are used. In these belts, as the usage time elapses, the rib surface wears by frictional contact with the pulley, and when this wear progresses, the convex portion of the pulley abuts against the groove bottom surface between the rib portions and wear progresses. And may cause cracks in the belt early.

  For this reason, there has been a demand for a method that can appropriately replace the belt according to the degree of belt wear and crack progress.

  As a method for improving this, in Patent Document 1, the inner surface portion of the rib rubber layer on the belt inner surface side and the adhesive rubber are black due to carbon black, whereas the rear surface portion of the rib rubber layer on the belt rear surface side is made of white carbon. Proposed to be white. When the white back surface portion is exposed in the black inner surface portion as viewed from the belt inner surface side, it is determined that the belt replacement is almost complete.

JP 2004-92761 A

  However, since the rubber layer containing white carbon is present at a position close to the back portion of the rib rubber layer on the belt back side, that is, the adhesive rubber layer in contact with the core wire, there is a concern that peeling occurs between the layers.

  The present invention pays attention to such problems, and as a result of earnest research, it is possible to plant short fibers on the belt transmission surface and expose them, reduce noise during belt running, improve durability, and detect the belt replacement time. It is an object of the present invention to provide a transmission belt and a manufacturing method thereof.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention includes a rubber layer in which a core wire is embedded along the belt longitudinal direction, and a rib portion or belt longitudinal direction extending in the longitudinal direction of the belt adjacent to the rubber layer. In the manufacturing method of the power transmission belt in which the mold part composed of the cog part provided at a predetermined interval is laminated,
A multilayer flocking layer in which at least one short fiber layer is laminated on the first flocking layer obtained by fixing the short fibers to the surface of the unvulcanized rubber and the colors of the short fibers are different from each other. Forming a covered rubber sleeve,
The rubber sleeve is disposed between an inner mold fitted with a flexible jacket and an outer mold in which a mold portion made of a rib mold or a cog mold is engraved on the inner peripheral surface,
The flexible jacket is inflated, and the multilayered flocking layer of the rubber sleeve is tightly molded on the stamped mold part, and the air existing from the multilayered flocking layer maintaining air permeability is discharged, and the vulcanized belt sleeve A belt molded body containing
The vulcanized belt sleeve surface was provided with a multi-layer flocking layer in which the color of the short fibers forming each layer was different,
It is in the manufacturing method of a transmission belt.

  As a result, by providing a multi-layered flocking layer with different short fiber colors on the mold part consisting of a rib part or a cog part, it is possible to obtain a transmission belt that can detect the replacement time of the belt, and the internal air is In order to be discharged, a flat surface with no depressions or protrusions is formed on the surface of the mold part, and the friction transmission surface is a multi-layered flocking layer. The effect can be maintained for a long time, and it has excellent wear resistance.

  Invention of Claim 2 of this application is a manufacturing method of the transmission belt characterized by the color of the short fiber of a 1st flocking layer being different from the color of unvulcanized rubber, By making the color of unvulcanized rubber different, the color difference of each layer becomes clear and the belt replacement time can be detected accurately.

  In the invention according to claim 3 of the present application, the first flocked layer has a multilayer flocked layer in which short fibers are fixed to the surface of the unvulcanized rubber, and is different from the first flocked layer in the surface layer from the first flocked layer. This is a method for producing a transmission belt comprising a second flocked layer to which short fibers are attached. By providing a multi-layered flocked layer having different short fiber colors on the mold part, the outermost second flocked layer is worn. When the innermost first flocking layer is exposed, a color change occurs, and a transmission belt capable of detecting the belt replacement time is manufactured.

  In the invention according to claim 4 of the present application, the first flocked layer has a multilayer flocked layer in which short fibers are fixed to the surface of the unvulcanized rubber, and is located on the surface layer from the first flocked layer and is different in color from the first flocked layer. A transmission belt comprising a second flocked layer to which short fibers are attached, and a third flocked layer to which short fibers having a different color from the first flocked layer and the second flocked layer are attached to the surface layer from the second flocked layer. This is a manufacturing method, and the belt replacement time can be detected more accurately by the color change of each layer of the multi-layer flocking layer attached to the mold part.

  In the invention according to claim 5, a rubber layer in which a core wire is embedded along the belt longitudinal direction, and a rib portion extending in the belt longitudinal direction adjacent to the rubber layer or a cog portion provided at a predetermined interval in the belt longitudinal direction In a transmission belt having a die-molded portion, the inner layer in which rubber is flowed in a wave shape and the surface layer in which short fibers are planted in multiple layers on the die-molded portion are formed, and the surface of the die-molded portion is formed on a flat surface. In addition, the surface layer is a multilayer flocking layer in which at least one short fiber layer is laminated on the surface of the first flocking layer with the short fibers fixed to the surface, and the colors of the short fibers are different from each other. Transmission belt that can detect the belt replacement time by observing the surface color by providing a multi-layer flocking layer with different short fiber colors at the ribbed or cogged part Belt, on the surface of the mold part Forms a flat surface with no dents or protrusions, and because the friction transmission surface is a multi-layer flocking layer, it is highly quiet from the beginning of running and can maintain its effect for a long time. Combines wear resistance.

  In the invention according to claim 6 of the present application, the belt is a transmission belt in which the color of the short fibers of the first flocked layer is different from the color of the unvulcanized rubber, and the difference in color of each layer becomes clear and the belt replacement time is accurate. Can be detected.

  In the invention according to claim 7 of the present application, the first flocking layer in which the multi-layer flocking layer embeds the short fibers in the rubber layer, and the short fiber having a different color from the first flocking layer in the surface layer from the first flocking layer are fixed. A transmission belt having a second flocking layer, and a change in color occurs when the innermost first flocking layer is exposed due to wear of the outermost second flocking layer, and the belt replacement time can be detected. become.

  In the invention according to claim 8 of the present application, the first flocking layer in which the multi-layer flocking layer embeds the short fibers in the rubber layer, and the short fiber having a different color from the first flocking layer in the surface layer from the first flocking layer are fixed. A transmission belt comprising a second flocked layer and a third flocked layer to which a short fiber having a different color from that of the first flocked layer and the second flocked layer is fixed. By changing the color of each layer of the multi-layered flocking layer attached to the belt, a transmission belt can be detected that can detect the belt replacement time more accurately.

  According to the above invention, by providing a multi-layered flocking layer with different short fiber colors on the mold part composed of the rib part or the cog part, the belt replacement time can be detected, and furthermore, the surface of the rubber sleeve has a multi-layered flocking. When the rubber sleeve is closely molded to the stamped mold part of the outer mold, the air existing between the rubber sleeve and the outer mold goes out of the mold through the flocked layer that maintains air permeability. Since there are no dents or protrusions on the surface of the mold part, there are few cracks in the belt running, belt durability is improved, and the friction transmission surface is a multilayer flocking layer Therefore, the noise is high from the beginning of running, the effect can be maintained for a long time, and it has excellent wear resistance.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In the present invention, a rubber sheet in which short fibers forming a compressed rubber layer are oriented in the width direction is produced. As a production method thereof, there are an extrusion method and a rolling method using a calendar. Of course, it is needless to say that a rubber sheet not containing short fibers can also be used.

  In the following, as an example, when a rubber sheet in which fibers are oriented in the width direction is prepared by an extrusion method, 10 to 40 parts by mass of short fibers are previously added to 100 parts by mass of the polymer by an open roll and kneaded. Thereafter, the kneaded master batch is discharged once and cooled to 20 to 50 ° C. to prevent rubber scorching.

  When 1 to 10 parts by mass of a softening agent is added, the familiarity between the short fibers and the rubber is improved, and the dispersion into the rubber is improved. In addition, the short fibers themselves are prevented from being entangled and becoming cottony. In other words, the softener penetrates into the short fibers and acts as a lubricant to loosen the entanglement between the elementary fibers, prevents the short fibers from becoming cottony, and the familiarity between the short fibers and the rubber. Improves short fiber dispersion

  Subsequently, after the master batch is kneaded with an extrusion screw of a cylinder in an extruder, the temperature is usually adjusted to 40 to 100 ° C., the rubber mixed with short fibers is smoothly flowed to the rubber passage made of the environment expansion die, and the rubber While passing through the passage, it is extruded into a cylindrical molded body in which short fibers are oriented in the circumferential direction. Thereafter, the cylindrical molded body has a thickness of 1 to 10 mm in which short fibers are uniformly oriented in the circumferential direction from the inner layer to the outer layer, and is cut into one rubber sheet by a cutting means, followed by the rubber sheet. Cut the rubber sheet at predetermined intervals.

  The raw rubber for the rubber sheet used here is natural rubber, butyl rubber, styrene-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, alkylated chlorosulfonated polyethylene, hydrogenated nitrile rubber, hydrogenated nitrile rubber and unsaturated carboxylic acid. A mixed polymer with an acid metal salt, a rubber material such as ethylene-α-olefin elastomer made of ethylene-propylene rubber (EPR) or ethylene-propylene-diene monomer (EPDM), or a mixture thereof is used. Examples of diene monomers include dicyclopentadiene, methylene norbornene, ethylidene norbornene, 1,4-hexadiene, cyclooctadiene, and the like.

  The rubber sheet is made of fibers such as aramid fiber, polyamide fiber, polyester fiber, and cotton, and the length of the fiber varies depending on the type of fiber, but a short fiber of about 1 to 10 mm is used, for example, an aramid fiber. About 3 to 5 mm, polyamide fibers, polyester fibers, and cotton are about 5 to 10 mm. The addition amount is 10 to 40 parts by mass with respect to 100 parts by mass of rubber. However, it is not always necessary to mix the short fibers.

  Furthermore, a softener, a reinforcing agent composed of carbon black, a filler, an anti-aging agent, a vulcanization accelerator, a vulcanizing agent, and the like are added to the rubber sheet.

  Examples of the softening agent include general rubber plasticizers, such as phthalates such as dibutyl phthalate (DBP) and dioctyl phthalate (DOP), adipates such as dioctyl adipate (DOA), and dioctyl sebacate (DOS). Sebacates, phosphates such as tricresyl phosphate, etc., or general petroleum softeners are included.

  Subsequently, on the outer peripheral surface of the flexible jacket 42 made of vulcanized rubber attached to the inner mold 41, a release sheet (not shown) made of release paper or a resin film, for example, polyterafluoroethylene, polyester, polyamide, polycarbonate. After that, a rubber material 22 made of a rubber sheet with oriented short fibers is wound and wrapped or butt-jointed to produce an unvulcanized rubber sleeve 24.

  Next, an adhesive is applied to the surface of the rubber material 22 by a spray method to a thickness of 0.04 mm or less, and it is not necessary to provide a thick adhesive layer. As will be described later, when the adhesive layer is provided, the first flocking layer is not embedded in the rubber layer (rubber material 22) and is easily peeled off. Examples of the adhesive include organic solvents such as toluene and methyl ethyl ketone, acrylic emulsions, vinyl acetate emulsions, and styrene emulsions.

  Then, as shown in FIG. 1 and FIG. 2, a known electrostatic flocking machine is used to provide a multilayer flocking layer 26 composed of a first flocking layer 26a and a second flocking layer 26b on the surface of the rubber material 22. Perform flocking. Specifically, the inner mold 41 is grounded, and an electric field is formed by applying a voltage to the electrode of the electrostatic flocking machine. Rayon, cotton, polyester, nylon, aramid, vinylon, carbon After supplying the pile which electrodeposited the surface which consists of a fiber, polytetrafluoroethylene, etc., it flies and pierces the rubber material 22, and forms the 1st flocking layer 26a, and then applies a mist-like adhesive with a spray. Then, the second flocked layer 26b is formed by performing electrostatic flocking in the same manner as the first flocked layer 26a to provide the multilayer flocked layer 26. Although the rubber sleeve 24 after the flocking is naturally dried, it is not necessary to provide a drying process.

  In addition, in order to form the 1st flocking layer 26a, it can finish to predetermined thickness by performing the flocking once or several times. The same applies to the second flocked layer 26b.

Basis weight of the multilayer flocked layer 26 attached to the surface of the rubber sleeve 24 is suitable in terms of the range of 10 to 40 g / m ² to maintain the breathability and less than 10 g / m ^2, short fiber is less In the short time, the problem of falling off the belt surface and reducing the effect of sound generation occurs. On the other hand, if it exceeds 40 g / m ² , the amount of short fibers increases and the air permeability is impaired. The air is more likely to be inherent.
Moreover, the thickness of the multilayer flocking layer 26 before vulcanization is 1.0 to 1.5 mm, and the thickness after vulcanization (after molding) is suitably 0.05 to 0.5 mm.

  The first flocked layer 26a is a layer in which most or all of the short fibers are embedded in the rubber layer after vulcanization. The second flocked layer 26b is a layer in which short fibers are fixed to the surface of the first flocked layer 26a. However, a part of the short fibers may be embedded in the rubber layer and fixed. It should be noted that the interface between the first flocked layer 26a and the second flocked layer 26b is not completely clear, and some of the short fibers constituting each flocked layer may exist in the other flocked layer, but most of them are in each layer. It only has to exist.

  As the short fibers constituting the first flocked layer 26a, short fibers having a relatively large fiber diameter and a long fiber length dyed black, red, yellow, orange, or yellow-green are used. Specifically, short fibers having a fiber diameter of 15 to 36 μm and a fiber length of 0.4 to 2.0 mm can be used. Thereby, it becomes easy to be embedded in the rubber layer, and the second flocked layer 26b can exert its effect over a long period of time even after wear.

The short fibers constituting the second flocked layer 26b are dyed in black, red, yellow, orange, or yellow-green, and the color is different from the short fibers of the first flocked layer 26a. The short fibers constituting the second flocked layer 26b are short fibers having a smaller fiber diameter or fiber length than the short fibers constituting the first flocked layer 26a, that is, the fiber diameter is relatively small. Short fibers having a short length are preferably used. Specifically, short fibers having a fiber diameter of 5 to 20 μm and a fiber length of 0.2 to 1.0 mm can be used. This makes it difficult to embed in the rubber layer and makes it easy to adhere to the surface, so that the effect can be sufficiently exerted in the initial stage of running. In addition, if the short fiber which has both a fiber diameter and fiber length smaller than the short fiber which comprises the 1st flocking layer 26a as a short fiber which comprises the 2nd flocking layer 26b, the said effect will become higher.
However, the short fibers used in the first flocked layer 26a and the second flocked layer 26b may all have the same material, diameter, and length.

  Examples of materials constituting each short fiber include polyamide short fibers such as 6 nylon and 66 nylon, rayon short fibers, aramid short fibers such as p-aramid and m-aramid, cotton short fibers, and polyethylene short fibers. Can do. In particular, it is desirable to include a polyamide short fiber having a high sound-proofing effect. Moreover, the short fiber which comprises each flocking layer can also be changed according to the difference of the characteristic requested | required after driving | running | working initial stage and time-dependent driving | running | working.

  Further, as the multi-layer flocking layer 26, a first flocking layer 26a in which short fibers are fixed to the surface of the rubber material 22, and a short fiber having a color different from that of the first flocking layer on the surface layer from the first flocking layer 26a. And a third flocked layer (not shown) to which short fibers having a different color from the first flocked layer 26a and the second flocked layer 26b are attached to the surface of the second flocked layer 26b. Can also be provided.

  Next, as shown in FIG. 3, the inner die 41 with the multi-layered flocking layer 26 with a different short fiber color in each layer is mounted on the base with a certain gap inside the outer die 46. Put. Since the inner mold 41 is moved from another molding process, the medium distribution port A and the medium feeding / discharging path B are separated. After the inner mold 41 is placed on the base, the medium distribution port A is Connect to the pipe with joint J.

  The medium feeder is operated to feed high-pressure air or high-pressure steam into the flexible jacket 42 through the medium inlet / outlet passage B and the medium circulation port A. Since the upper and lower portions of the flexible jacket 42 are hermetically fixed on the inner mold 41, air is filled between the inner surface of the flexible jacket 42 and the outer surface of the inner mold 41. It gradually expands. Then, the flocked rubber sleeve 24 mounted on the outer peripheral surface is uniformly expanded in the radial direction, and contacted with the rib mold 45 of the outer mold 46 heated to 100 to 160 ° C. with a heater or high temperature steam for 30 to 120 seconds. Let me.

  At this time, the implanted rubber sleeve 24 is pressed against the rib mold 45 of the outer mold 46 by the expansion pressing force of the flexible jacket 42, and a plurality of V-shaped projections 27 are formed on the surface as shown in FIG. The unvulcanized preformed body 21 is formed.

  Thereafter, the valve is switched to the vacuum pump, the air filled in the flexible jacket 42 is exhausted, and then the flexible jacket 42 is returned to its original position by suction.

  Then, the inner die 41 is removed from the outer die 46, and a reinforcing wire 47, an adhesive rubber 49, and a cord 48 made of a cord are sequentially wound around the outer peripheral surface of the flexible jacket 42 of the inner die 41 to provide another sleeve 25. Form. Then, after re-installing the inner mold 41 in the outer mold 46 as shown in FIG. 5, the flexible jacket 42 is expanded as shown in FIG. 6, and the other sleeve 25 is uniformly expanded in the radial direction. The vulcanized belt sleeve is vulcanized in close contact with the preformed body 21 mounted on the mold part 45 of the outer mold 46 which is heated to 100 to 180 ° C. with a heater or high-temperature steam. 51 is produced. At this time, the air existing between the outer mold 46 and the multilayer flocking layer 26 is discharged through the multilayer flocking layer 26 as a passage, so that the surface of the rib portion becomes a flat surface where no depressions or protrusions are present. Molded.

  After vulcanization, the first flocked layer 26a of the multilayer flocked layer 26 is a layer in which most or all of the short fibers are embedded in the rubber layer (rubber material 22). The second flocked layer 26b is a layer in which short fibers are fixed to the surface of the first flocked layer 26a. However, a part of the short fibers may be embedded in the rubber layer and fixed. It should be noted that the interface between the first flocked layer 26a and the second flocked layer 26b is not completely clear, and some of the short fibers constituting each flocked layer may exist in the other flocked layer, but most of them are in each layer. It only has to exist.

  By molding the unvulcanized preform 21 as in the above manufacturing method, the extension amount of the other sleeve 25 due to the expansion of the flexible jacket 42 is suppressed during molding, and the core wire 48 is arranged flat. And a V-ribbed belt having excellent dimensional stability can be produced.

  After vulcanization, the flexible jacket 42 is contracted as shown in FIG. 7, the inner mold 41 is removed from the outer mold 46, and then the vulcanized belt sleeve 51 attached to the outer mold 46 is pulled out. On the surface of the molding portion 27 of the vulcanized belt sleeve 51, the second flocked layer 26b of the multilayer flocked layer 26 is fixed to the first flocked layer 26a embedded in the rubber layer (rubber material 22) and raised at various angles. And it is in an exposed state.

  Further, while inserting the vulcanized belt sleeve 51 into another one-axis or two-axis drum and rotating it, it is cut into a predetermined width in the circumferential direction, taken out from the drum and reversed, and the circumference is constant. A V-ribbed belt 1 in which shaped ribs were accurately formed was obtained. When the outer mold 46 is a split mold, the unvulcanized sleeve can be easily inserted and the vulcanized sleeve can be easily removed, and the split surface can function as a kind of air vent to further enhance the V-shaped rib. It can be formed accurately.

  In the present invention, the above embodiment can be modified as follows.

  (1) As described above, it is not necessary to stack and integrate the unvulcanized preform and another sleeve, and at least a core wire is wound around the inner flexible jacket surface, and a surface layer is formed thereon. Laminated unvulcanized rubber sleeves with a multi-layered flocking layer are finished into a belt molded body, and the above inner mold is placed between the outer mold with a rib or cog mold on the inner peripheral surface. Then, the flexible jacket can be expanded to produce a belt sleeve in which the belt molded body is in close contact with the stamped mold part of the outer mold and vulcanized.

  (2) As described above, it is not necessary for the rubber sheet forming the compressed rubber layer to contain short fibers.

  (3) A multi-layer flocking layer can be provided directly on the surface of the rubber sleeve 24 without applying a mist-like adhesive.

  (4) Moreover, a rubber sheet with a flocking layer in which a multilayer flocking layer is attached to the surface of the rubber sheet can be produced, and the rubber sheet can be used as a rubber sleeve.

  (5) The multi-layer flocking layer is composed of a first flocking layer, a second flocking layer on the surface layer than the first flocking layer, to which short fibers having a different color from the first flocking layer are attached, and a surface layer from the second flocking layer. In this case, the first flocked layer and the second flocked layer may be laminated with a third flocked layer to which short fibers having different colors are attached.

  FIG. 8 is a cross-sectional view of the obtained V-ribbed belt. The V-ribbed belt 1 has a configuration in which an extension portion 5 made of a rubber layer in which short fibers are randomly oriented, an adhesive portion 2 in which a core wire 3 made of a twisted cord is embedded, and a compression portion 6 are disposed below the extension portion 5. A part of the core wire 3 is in contact with the extending portion 5, and the remaining portion is in contact with the bonding portion 2. The compression section 6 has a plurality of trapezoidal ribs having a substantially triangular cross section extending in the longitudinal direction of the belt. The ribs serve as friction transmission parts, and the rib surfaces serve as friction transmission surfaces. The layer 9 is arranged.

  In the present invention, the multi-layer flocking layer 9 has a first flocking layer 9a in which red short fibers are embedded in a rubber layer, and black short fibers having a different color from the short fibers of the first flocking layer 9a fixed to the surface layer. A second flocked layer 9b. With this configuration, the short fibers of the second flocked layer 9b are exposed to the friction transmission surface (rib surface) at the beginning of running, and various effects such as friction characteristics and sound generation resistance can be achieved. As the traveling progresses and the second flocked layer 9b gradually wears, the short fibers of the first flocked layer 9a are exposed on the rib surface, and the belt replacement time can be detected by observing the color change on the rib surface. .

  Each layer will be described in more detail. The first flocking layer 9a is a layer in which most or all of the short fibers are embedded in the rubber layer. The second flocked layer 9b is a layer in which short fibers are fixed to the surface of the first flocked layer 9a. However, a part of the short fibers may be embedded in the rubber layer and fixed. It should be noted that the interface between the first flocked layer 9a and the second flocked layer 9b is not completely clear, and some of the short fibers constituting each flocked layer may be present in the other flocked layer, most of which are in each layer. It only has to exist.

The density of the short fibers in the multi-layer flocking layer 9 contributes to the friction coefficient and the sound during running. Specifically, it is preferably 10,000 to 500,000 pieces / cm ^2, but is not limited thereto. Moreover, it is preferable that the flock layer 9 has a thickness of 0.05 to 0.5 mm. If it is less than 0.05 mm, there is a problem that the effect of the flocked layer is diminished by abrasion. On the other hand, if the thickness exceeds 0.5 mm, the stretchability of the surface of the compressed portion is impaired, so that the bending fatigue resistance may be poor.

  In addition to the short fibers, a solid lubricant or the like can be fixed to the multilayer flocking layer 9. As the solid lubricant, graphite, molybdenum disulfide, mica, talc, antimony trioxide, molybdenum diselenide, tungsten disulfide, polytetrafluoroethylene (PTFE), or the like can be used alone or in combination. These short fibers and solid lubricant are fixed to the friction transmission surface via an adhesive.

  In addition to the above-mentioned vegetable soft granules, if necessary, it can be added to usual rubber compounds such as carbon black, reinforcing agents such as silica, fillers, plasticizers, stabilizers, processing aids, colorants, short fibers. What is used can be used.

  The adhesive part 2 can be made of the same rubber composition as that of the compression part 6, but may be made of another rubber composition. Although raw rubbers and compounding agents as described above can be used, it is preferable that short fibers are not mixed in consideration of adhesiveness.

  Core 3 is polyethylene terephthalate (PET) fiber, polyethylene naphthalate (PEN) fiber, polytrimethylene terephthalate (PTT) fiber, polybutylene terephthalate (PBT) fiber, polyparaphenylene benzobisoxazole (PBO) fiber, polyamide fiber A twisted yarn cord made of glass fiber or aramid fiber can be used.

  The stretcher 5 can be made of the same rubber composition as that of the compressor 6, but may be made of another rubber composition. Here, the extending portion 5 is formed of a rubber composition containing short fibers, but an uneven pattern can also be provided on the back surface in order to suppress abnormal noise when driving the back surface. Examples of the concavo-convex pattern include a knitted fabric pattern, a woven fabric pattern, a suede woven fabric pattern, and the like, and most preferably a woven fabric pattern. Moreover, as a short fiber, short fibers, such as polyester, aramid, polyamide, cotton, and PBO, can be mix | blended as desired. In FIG. 8, the short fibers are oriented in the random direction, but they may be oriented in one direction such as in the belt width direction. In addition, when oriented in a random direction, there is a feature that the generation of cracks and cracks from multiple directions can be suppressed. At this time, if a short fiber (for example, a milled fiber) having a bent portion is selected as the short fiber, more It has a feature that it can withstand the force acting from the direction. As the milled fiber, for example, a polyamide fiber can be used, and the fiber length is preferably in the range of 0.1 to 3.0 mm. Moreover, it is desirable that the amount of the short fiber in the stretched portion is such that the short fiber is contained so that the short fiber is in a range of 35 to 100 with respect to 100 parts by weight of the rubber.

  Note that the V-ribbed belt is not limited to the configuration shown in FIG. 8, and for example, a V-ribbed belt without an adhesive portion, a V-ribbed belt with a canvas attached to the back, and the like belong to the technical scope of the present invention. Hereinafter, these embodiments will be described with reference to the drawings.

  The V-ribbed belt 1 shown in FIG. 9 has a configuration in which an extension portion 5 formed of a rubber composition having a flock layer 8 provided on the back surface and a compression portion 6 disposed below the extension portion 5. The core wire 3 is embedded in the main body along the longitudinal direction of the belt, and a part thereof is in contact with the extension part 5 and the remaining part is in contact with the compression part 6. The compression section 6 is provided with a plurality of ribs having a substantially triangular cross section extending in the belt longitudinal direction. Here, the short fiber contained in the compression part 6 exhibits the flow state along the rib shape, and the short fiber near the surface is oriented along the rib shape. And it has the structure which has arrange | positioned the multilayer flocking layer 9 which has the 1st flocking layer 9a and the 2nd flocking layer 9b on the rib surface.

  In the case where the adhesive portion is not disposed as shown in FIG. 9, the core wire 3 is embedded in the belt main body at the boundary region between the extension portion 5 and the compression portion 6. At this time, in consideration of the adhesion between the core wire 3 and the belt body, it is desirable that one of the rubber layers of the extension portion 5 and the compression portion 6 is made of a rubber composition not containing short fibers.

  In FIG. 9, the stretched part 5 has a structure in which the flocked layer 8 is provided on the surface of the rubber composition that does not contain short fibers. However, a structure in which a flocked layer is provided on the surface of the rubber composition that contains short fibers may also be used. Is possible.

  Furthermore, in FIG. 9, although the short fiber contained in the compression part 26 is exhibiting the flow state along a rib shape, it is not limited, For example, it is good also as a structure which the short fiber orientated in the width direction.

  Moreover, a low edge cog belt can also be shape | molded with the manufacturing method of the power transmission belt using the type | mold apparatus mentioned above. The belt includes a core wire embedded in a spiral shape in the longitudinal direction of the belt in the adhesive portion, an extension portion laminated on the upper side (belt outer peripheral side) of the core wire, and a lower side (belt inner peripheral side) of the core wire. ), And the compression part has a cog part having alternately concave and convex parts provided at a predetermined interval. Reinforcing cloth is provided on the back surface of the extension portion and the cog portion surface of the compression portion.

  When molding this belt, the outer mold 46 may be provided with a mold portion 45 corresponding to a cog mold extending in the longitudinal direction of the outer mold 46 at a predetermined interval along the inner peripheral direction of the main body. The structure of the other mold devices remains unchanged.

  The power transmission belt manufacturing method and power transmission belt of the present invention can be applied to power transmission belts such as V-ribbed belts and low-edge V belts that can detect the belt replacement time, reduce noise during belt travel, and reduce belt elongation. it can.

It is a figure which shows the state which provided the multilayer flocking layer in the surface of the rubber sleeve. The enlarged view of the multilayer flocking layer in FIG. 1 is shown. It is a longitudinal cross-sectional view of the state which shape | molds a preforming body. It is sectional drawing of a state after producing a preforming body. It is sectional drawing of the state before producing a sleeve. It is sectional drawing of the state which has vulcanized the sleeve. It is sectional drawing of a state after vulcanizing a sleeve. It is sectional drawing of the V-ribbed belt obtained with the manufacturing method of this invention. It is sectional drawing of the other V-ribbed belt obtained with the manufacturing method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 V ribbed belt 2 Adhesion part 3 Core wire 5 Extension | extension part 6 Compression layer 9 Flocking layer 9a 1st flocking layer 9b 2nd flocking layer 21 Pre-molding body 22 Rubber material 23 Surface layer 24 Rubber sleeve 25 Another sleeve 26 Multilayer flocking layer 26a 1st flocking layer 26b 2nd flocking layer 27 Mold part 41 Inner mold 42 Flexible jacket 45 Mold part 46 Outer mold 51 Vulcanized belt sleeve

Claims (8)

Laminate a rubber layer with a core wire embedded in the belt longitudinal direction and a die-attached portion consisting of a rib portion extending in the longitudinal direction of the belt adjacent to the rubber layer or a cog portion provided at a predetermined interval in the belt longitudinal direction. In the manufacturing method for the transmission belt,
A multilayer flocking layer in which at least one short fiber layer is laminated on the first flocking layer obtained by fixing the short fibers to the surface of the unvulcanized rubber and the colors of the short fibers are different from each other. Forming a covered rubber sleeve,
The rubber sleeve is disposed between an inner mold fitted with a flexible jacket and an outer mold in which a mold portion made of a rib mold or a cog mold is engraved on the inner peripheral surface,
The flexible jacket is inflated and the multilayered flocking layer of the rubber sleeve is tightly molded on the stamped mold part to produce a belt molded body including a vulcanized belt sleeve,
The vulcanized belt sleeve surface was provided with a multi-layered flocking layer in which the colors of the short fibers forming the layers of the short fibers were different from each other.
A method of manufacturing a power transmission belt characterized by the above.   The method for manufacturing a transmission belt according to claim 1, wherein the color of the short fibers of the first flocked layer is different from the color of the unvulcanized rubber.   The second flocked layer has a first flocked layer in which short fibers are fixed to the surface of the unvulcanized rubber, and a second flocked fiber that is on the surface layer of the first flocked layer and has a different color from the first flocked layer. The manufacturing method of the transmission belt of Claim 1 or 2 which consists of a flocking layer.   The second flocked layer has a first flocked layer in which short fibers are fixed to the surface of the unvulcanized rubber, and a second flocked fiber that is on the surface layer of the first flocked layer and has a different color from the first flocked layer. The transmission belt according to claim 1 or 2, comprising a flocking layer and a third flocking layer to which a short fiber having a color different from that of the first flocking layer and the second flocking layer is attached. Method.   A power transmission belt having a rubber layer in which a core wire is embedded along the belt longitudinal direction, and a molding portion including a rib portion extending in the belt longitudinal direction adjacent to the rubber layer or a cog portion provided at a predetermined interval in the belt longitudinal direction The inner layer in which rubber is flowed in a wave shape, and a surface layer in which short fibers are planted in multiple layers in the mold part, the surface of the mold part is formed on a flat surface, and the surface layer is a short fiber A power transmission belt comprising a multilayer flocking layer in which at least one short fiber layer is laminated on the surface of the first flocking layer fixed to the surface, and the colors of the short fibers are different from each other. .   The transmission belt according to claim 5, wherein the color of the short fibers of the first flocking layer is different from the color of the unvulcanized rubber.   The multi-layer flocking layer has a first flocking layer in which short fibers are embedded in a rubber layer, and a second flocking layer to which a short fiber having a different color from the first flocking layer is fixed to the surface layer from the first flocking layer. The power transmission belt according to claim 5 or 6.   A first flocked layer in which a multi-layer flocked layer is embedded with a short fiber in a rubber layer; a second flocked layer on which a short fiber having a color different from that of the first flocked layer is fixed to a surface layer of the first flocked layer; The power transmission belt according to claim 5 or 6, comprising a third flocked layer to which a short fiber having a color different from that of the first flocked layer and the second flocked layer is fixed.

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