JP2021089065A - Set of transmission v-belts, and manufacturing method and use method therefor - Google Patents

Abstract

To provide a set of a plurality of transmission V-belts capable of simultaneously enhancing lateral pressure resistance, flexibility, quietness, durability and transmission capacity, and to provide a manufacturing method and a use method therefor.SOLUTION: A set of transmission V-belt 1 and a transmission V-belt 2 are wound around a V-shaped groove 31 and a V-shaped groove 41 formed on the outer peripheries of a drive pulley 3 and a driven pulley 4. In the relation between the transmission V-belt 1 and the transmission V-belt 2, an outer peripheral length Lo2 of the transmission V-belt 2 wound on the inner peripheral side is equal to or less than an inner peripheral length Li1 of the transmission V-belt 1 wound on the outer peripheral side, and an upper width Wo2 of the transmission V-belt 2 is equal to or less than a lower width Wi1 of the transmission V-belt 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a set of a plurality of transmission V-belts wound around a groove formed on the outer periphery of a pulley, a method of manufacturing the same, and a method of using the same.

Generally, as a means of power transmission, a transmission V-belt is widely used along with gears and chains. The transmission V-belt has a V-shaped (wedge-shaped) side surface, and power is transmitted to and from a pulley having a groove facing the V-belt via frictional force. The transmission V-belt includes a low-edge type (low-edge V-belt), which is a rubber layer with an exposed V-shaped side surface, and a wrapped type (wrapped) type (wrapped) type, in which the V-shaped side surface is covered with a cover cloth. V-belt) and the like.

The low-edge V-belt and the wrapped V-belt are used properly according to the application depending on the difference in friction coefficient between the pulley and the pulley. Further, the low-edge type belt includes a low-edge cogged V-belt in which cogs are provided only on the lower surface (inner peripheral surface) of the belt or on both the lower surface and the upper surface (outer peripheral surface) of the belt to improve the flexibility.

These transmission V-belts are used for driving general industrial machines, agricultural machines, auxiliary machines in automobile engines, and the like. A part of the transmission V-belt is called a speed change belt, and is used in a belt-type continuously variable transmission such as a motorcycle.

A continuously variable transmission (CVT) is a power transmission mechanism capable of continuously changing a gear ratio, and is used in many fields such as motorcycles, automobiles, and machine tools. CVTs are classified into belt-type CVTs, chain-type CVTs, toroidal CVTs, and the like, depending on the difference in power transmission method.

Among these, examples of the belt used for the belt type CVT include a block belt (particularly a metal belt (steel belt)) and a rubber belt (rubber transmission V-belt). The rubber belt includes the low-edge V-belt and the wrapped V-belt.

The block belt has a structure in which a resin or metal block (top) is fitted into a non-terminal flexible body made of a metal laminated ring or the like. The driving force from the driving pulley is transmitted to the blocks via the frictional force, transmitted as pressure between adjacent blocks, and transmitted to the driven pulley. The non-terminal flexible body plays a role in positioning the block, but is not directly involved in the transmission of power.

On the other hand, the rubber belt is a laminated body of a tension body made of a twisted cord or the like and a compression layer and an extension layer made of a cured product of a rubber composition or the like. The driving force from the driving pulley is transmitted to the tension body via the compression layer and the extension layer via the frictional force, is transmitted as the tension of the tension body, and is transmitted to the driven pulley. In other words, the tension body acts as the main element of power transmission. Compared to block belts, rubber belts have the advantages of being quieter, lighter, and requiring no lubrication, and are also capable of reverse bending, resulting in greater layout freedom.

Both the block belt and the rubber belt are endless annular bodies, and there are some similar parts in appearance. However, as described above, the characteristics required for the power transmission mechanism and the belt are significantly different. Therefore, the block belt and the rubber belt have unique designs as they belong to different technical fields.

Since the block belt has excellent strength of the block forming the friction transmission surface, it is relatively easy to apply to a high load. However, noise due to contact between hard materials and periodicity of blocks is likely to occur. Further, since a lubrication mechanism for lubrication is required, the equipment is inevitably complicated.

On the other hand, the rubber belt is excellent in quietness because the belt body is formed of a cured product of a rubber composition having excellent flexibility. Further, since the belt itself is lightweight and does not require lubrication, the weight of the CVT can be reduced, simplified, and made compact. Further, so-called "reverse bending" (for example, a usage method in which the extension layer of the belt is inside the bending by bringing the flat pulley into contact with the upper surface of the belt) is also possible, and the degree of freedom in layout is high. However, it is difficult to apply it to a high load, and a phenomenon in which the belt warps into a dish-like shape (so-called dishing) is likely to occur due to the lateral pressure received from the pulley. When dishing occurs, there is a risk that the transmission efficiency will decrease and the belt life will decrease.

In a CVT using a rubber belt, it is necessary to widen the belt width in order to increase the transmission capacity. By widening the belt width, the number of tension bodies can be increased, and it becomes possible to use the belt with higher tension. Further, in order to increase the lateral pressure resistance, it is necessary to increase the belt thickness.

However, if the belt width is widened or the belt thickness is increased, the CVT becomes large and the flexibility of the belt is lowered, so that the transmission efficiency and the life of the belt may be lowered. Therefore, it has been proposed to control the ratio of the belt width to the belt thickness within a certain range.

For example, Patent Document 1 discloses that the aspect ratio of the transmission V-belt (the ratio of the upper width of the belt to the thickness of the belt) is 2 to 4. It is also described that cogs (teeth, notches or corrugations) are provided on the inner and outer peripheral surfaces of the belt as a measure for increasing the lateral pressure resistance while maintaining good flexibility of the belt.

However, the belt provided with the cog (low-edge cogged V-belt) has a drawback that noise due to the periodicity of the cog is likely to be generated. Further, in the cog-to-cog valley (cog valley) portion, stress is concentrated when the belt is bent, so that cracks are likely to occur, which may lead to a decrease in life. As described above, the conventional rubber belts have not been able to satisfy the requirements such as lateral pressure resistance, flexibility, quietness, and durability in use under a high load at a sufficient level.

Jikkai Sho 63-66649 Japanese Unexamined Patent Publication No. 63-251655 JP-A-2019-108979

By the way, instead of widening the belt width or increasing the belt thickness, an attempt has been made to wind a plurality of belts around a common V-groove of a pulley. For example, in Patent Document 2, a continuously variable transmission in which a plurality of V-belts formed by sequentially attaching a large number of V-shaped blocks in the longitudinal direction to a non-terminal flexible body are laid in a plurality of common V-groove pulleys. Is disclosed. However, since the V-belt used in the continuously variable transmission corresponds to the block belt, the technical field is different from that of the rubber belt. Therefore, the functions and shapes required for the belt are different, and it is difficult to deploy the belt as it is. Further, in Patent Document 2, there is a concern that the CVT becomes large due to multiple block belts, and problems such as noise and complication of the device are not sufficiently solved.

Further, in recent years, there has been an increasing demand for detecting and observing the state of the transmission belt such as pressure and temperature. For example, Patent Document 3 discloses a transmission belt having a sensor for detecting the state of the transmission belt. In Patent Document 3, the pressure sensor is integrated as a part of the belt by fitting the pressure sensor between the rubberized canvas and the laminated body of the unvulcanized rubber sheet and then vulcanizing under the condition of the temperature of 179 ° C. An example is a method of manufacturing a vulcanized toothed belt. However, according to the above manufacturing method, there is a limit to the sensors that can be used because the sensor is required to have high heat resistance and adhesiveness to the belt member.

Based on the above-mentioned problems to be examined, an object of the present invention is a set of a plurality of transmission V-belts capable of simultaneously increasing lateral pressure resistance, flexibility, quietness, durability, and transmission capacity, a method for manufacturing the same, and a method for using the same. Further, regarding a belt having a sensor, a transmission V-belt capable of loosening the restrictions on the sensors that can be used is provided.

In order to solve the above problems, the present invention is a set of a plurality of transmission V-belts that are overlapped and wound around a V-shaped groove formed on the outer circumference of a pulley.
In the relationship between the transmission V-belts wound around the groove,
The outer peripheral length Lо2 of the transmission V-belt wound around the inner peripheral side of the groove is equal to or less than the inner peripheral length Li1 of the transmission V-belt wound around the outer peripheral side of the groove.
The upper width Wо2 on the outer peripheral side of the transmission V-belt, which is wound around the inner peripheral side of the groove, is the lower width Wi1 or less on the inner peripheral side of the transmission V-belt, which is wound around the outer peripheral side of the groove. It is characterized by being.

According to the above configuration, when a plurality of transmission V-belts are overlapped and wound around the V-shaped groove formed on the outer circumference of the pulley, the upper surface of the transmission V-belt wound on the inner peripheral side of the groove. And the lower surface of the transmission V-belt wound around the outer peripheral side of the groove can be prevented from excessively interfering with each other.
As a result, the lateral pressure resistance, flexibility, quietness, durability, and transmission capacity of the transmission V-belt can be improved.

Further, the present invention relates to the above-mentioned set of a plurality of transmission V-belts.
The outer peripheral length Lо2 of the transmission V-belt wound around the inner peripheral side of the groove is shorter than the inner peripheral length Li1 of the transmission V-belt wound around the outer peripheral side of the groove.
The upper width Wо2 on the outer peripheral side of the transmission V-belt, which is wound around the inner peripheral side of the groove, is larger than the lower width Wi1 on the inner peripheral side of the transmission V-belt, which is wound around the outer peripheral side of the groove. It may be characterized by being short.

According to the above configuration, when a plurality of transmission V-belts are overlapped and wound around the V-shaped groove formed on the outer circumference of the pulley, the upper surface of the transmission V-belt wound on the inner peripheral side of the groove. And the lower surface of the transmission V-belt wound around the outer peripheral side of the groove can be provided with a gap so that the transmission V-belts do not interfere with each other.
As a result, the lateral pressure resistance, flexibility, quietness, durability, and transmission capacity of the transmission V-belt can be further improved.

Further, the present invention relates to the above-mentioned set of a plurality of transmission V-belts.
Each of the transmission V-belts has a V shape in a cross-sectional view in the width direction.
The angle A2 formed by both side surfaces of the transmission V-belt wound around the inner peripheral side of the groove is larger than the angle A1 formed by both side surfaces of the transmission V-belt wound around the outer peripheral side of the groove. It may be characterized by that.

Generally, when the transmission V-belt is wound around a pulley, the compression layer (inner circumference side) is compressed in the belt longitudinal direction while expanding in the belt width direction, and the extension layer (outer circumference side) is in the belt longitudinal direction. Is stretched while contracting in the belt width direction. Therefore, the angle (V angle) formed by both side surfaces of the transmission V-belt is smaller than that before winding the pulley. The degree to which the V angle becomes small correlates with the winding radius to the pulley, and the smaller the winding radius, the smaller the V angle. That is, the V angle of the transmission V-belt wound around the inner peripheral side of the groove of the pulley tends to be smaller than the V angle of the transmission V-belt wound around the outer peripheral side of the groove of the pulley.
Therefore, by adopting the above configuration in advance, it is possible to equalize the V angles when a plurality of transmission V-belts are stacked and wound around the grooves of the pulley.

Further, the present invention relates to the above-mentioned set of a plurality of transmission V-belts.
Each transmission V-belt is made of rubber and is made of rubber.
The rubber hardness on the inner peripheral side of the transmission V-belt wound on the inner peripheral side of the groove is lower than the rubber hardness on the inner peripheral side of the transmission V-belt wound on the outer peripheral side of the groove. It may be characterized by that.

Since the transmission V-belt wound on the inner peripheral side of the groove of the pulley has a smaller winding radius than the transmission V-belt wound on the outer peripheral side of the groove of the pulley, higher flexibility is required. Therefore, with the above configuration, the relative flexibility of the transmission V-belt wound around the inner peripheral side of the groove of the pulley can be ensured.

Further, the present invention relates to the above-mentioned set of a plurality of transmission V-belts.
The thickness of the transmission V-belt wound around the inner peripheral side of the groove may be thinner than the thickness of the transmission V-belt wound around the outer peripheral side of the groove.

Since the transmission V-belt wound on the inner peripheral side of the groove of the pulley has a smaller winding radius than the transmission V-belt wound on the outer peripheral side of the groove of the pulley, higher flexibility is required. Therefore, with the above configuration, the relative flexibility of the transmission V-belt wound around the inner peripheral side of the groove of the pulley can be ensured.

Further, the present invention relates to the above-mentioned set of a plurality of transmission V-belts.
A tension body is embedded in each of the transmission V-belts along the longitudinal direction of the belt.
The tension body may be characterized in that it is arranged at the central portion in the thickness direction of each transmission V-belt.

When the transmission V-belt in which the tension body is embedded is bent, it bends around the tension body. When the tension body is on the outer peripheral side of the center in the belt thickness direction, the resistance for bending the inner peripheral side of the transmission V-belt increases, and the flexibility decreases. Similarly, when the tension body is on the inner peripheral side of the center in the belt thickness direction, the resistance for bending the outer peripheral side of the transmission V-belt increases, and the flexibility decreases. Therefore, with the above configuration, the flexibility of the transmission V-belt can be improved in a well-balanced manner.

Further, the present invention relates to the above-mentioned set of a plurality of transmission V-belts.
The plurality of transmission V-belts may be characterized in that they are collectively covered with a cloth.

According to the above configuration, it is possible to prevent the transmission V-belt wound around the inner peripheral side of the groove of the pulley and the transmission V-belt wound around the outer peripheral side of the groove of the pulley from interfering with each other due to vibration. ..

Further, the present invention relates to the above-mentioned set of a plurality of transmission V-belts.
Each of the transmission V-belts may be characterized in that the relationship between the upper width Wо on the outer peripheral side and the thickness T satisfies the condition of 4 <(upper width Wо / thickness T) <8.

In the conventional transmission V-belt, it is necessary to secure sufficient lateral pressure resistance with one transmission V-belt, the belt thickness cannot be made very thin, and the Wo / T value is relatively small. (Patent Document 1 defines 2 to 4). On the other hand, in the present invention, since a plurality of transmission V-belts can be used to increase the lateral pressure resistance, the thickness of each belt can be made relatively thin, and the Wo / T value can be set. It can be made larger than before. When the Wo / T value is 4 or less, the flexibility is lowered. When the Wo / T value is 8 or more, the lateral pressure resistance decreases. Therefore, by making the Wo / T value satisfy the above conditions, the flexibility and the lateral pressure resistance can be improved in a well-balanced manner.

Further, the present invention relates to the above-mentioned set of a plurality of transmission V-belts.
A sensor for detecting the state of the transmission V-belt is provided between the transmission V-belt wound on the inner peripheral side of the groove and the transmission V-belt wound on the outer peripheral side of the groove. It may be characterized by being arranged.

Conventionally, when trying to attach a sensor to a transmission V-belt, it was embedded in the transmission V-belt, but since it is necessary to go through a vulcanization process in the transmission V-belt manufacturing process, it can be used as a sensor. There were restrictions (heat resistance, pressure resistance, etc.). However, according to the above configuration, since the sensor can be installed between the already completed transmission V-belt and the transmission V-belt, the types of sensors that can be used increase and the versatility is improved. Further, when the sensor is embedded in the transmission V-belt as in the conventional case, there is a concern that the sensor acts as a foreign substance and becomes a starting point of cracks to shorten the life of the belt. If so, that concern can be reduced.

Further, one of the present inventions is a transmission device provided with a plurality of pulleys having a V-shaped groove formed on the outer periphery thereof.
It is a method of using a set of a plurality of transmission V-belts, which comprises stacking and winding a plurality of transmission V-belts around the grooves of each pulley.

According to the above usage method, the lateral pressure resistance, flexibility, quietness, durability, and transmission capacity of the transmission V-belt can be improved.

Further, one of the present inventions is arranged on the outer circumference of a cylindrical drum, a plurality of belt sheets including a compression layer sheet, a tension body and an extension layer sheet, and between the belt sheets. After laminating the release layer sheets, vulcanize to obtain a belt sleeve.
A step of cutting the belt sleeve at predetermined width intervals to obtain a plurality of belt prototypes.
A plurality of transmission Vs, which comprises a step of obtaining a plurality of transmission V-belts by removing the release layer sheet after cutting the belt prototype into a V shape in a cross-sectional view in the width direction. This is a method for manufacturing a belt set.

According to the above manufacturing method, the belt length (outer circumference length, inner circumference length) and width (upper width) of each transmission V-belt are compared with the case where a plurality of transmission V-belts are manufactured from different belt sleeves. Lower width), V angle, etc. can be matched accurately.

Further, the present invention relates to the method for manufacturing a set of a plurality of transmission V-belts.
The angle A2 formed by both side surfaces of the transmission V-belt, which is wound around the inner peripheral side of the V-shaped groove formed on the outer circumference of the pulley, is wound around the outer circumference of the groove. It may be characterized by including a step of cutting or polishing both side surfaces of the transmission V-belt so as to be larger than the angle A1 formed by both side surfaces.

Generally, when the transmission V-belt is wound around a pulley, the compression layer (inner circumference side) is compressed in the belt longitudinal direction while expanding in the belt width direction, and the extension layer (outer circumference side) is in the belt longitudinal direction. Is stretched while contracting in the belt width direction. Therefore, the angle (V angle) formed by both side surfaces of the transmission V-belt is smaller than that before winding the pulley. The degree to which the V angle becomes small correlates with the winding radius to the pulley, and the smaller the winding radius, the smaller the V angle. That is, the V angle of the transmission V-belt wound around the inner peripheral side of the groove of the pulley tends to be smaller than the V angle of the transmission V-belt wound around the outer peripheral side of the groove of the pulley.
Therefore, by going through the above steps, it is possible to equalize the V angles when a plurality of transmission V-belts are stacked and wound around the grooves of the pulley.

To provide a set of a plurality of transmission V-belts capable of simultaneously increasing lateral pressure resistance, flexibility, quietness, durability, and transmission capacity, a method for manufacturing the same, and a method for using the belt, and further relating to a belt having a sensor. It is possible to provide a transmission V-belt that can relax the restrictions on the sensors that can be used.

FIG. 5 is a cross-sectional view of a belt transmission device for driving an auxiliary machine using two transmission V-belts according to the first embodiment. 2 is a side view and a sectional view in the width direction of the two transmission V-belts according to the first embodiment. It is explanatory drawing which shows the relationship between the inner peripheral surface of the transmission V-belt 1 and the outer peripheral surface of the transmission V-belt 2 which concerns on Embodiment 1. FIG. It is explanatory drawing of the angle formed by both side surface of the transmission V belt which concerns on Embodiment 1. FIG. It is explanatory drawing of the expansion and contraction mode which acts on the transmission V-belt when the transmission V-belt is wound around the V-shaped groove of a pulley. It is explanatory drawing of two transmission V-belts covered with cloth which concerns on Embodiment 2. FIG. FIG. 5 is an explanatory diagram of two transmission V-belts provided with a sensor according to the third embodiment. It is explanatory drawing of the measuring method of the upper width and the lower width of a transmission V-belt. It is explanatory drawing of the measuring method of the angle (V angle) formed by both side surfaces of a transmission V-belt. It is explanatory drawing of the manufacturing method of two transmission V belts which concerns on Embodiment 1. FIG. It is explanatory drawing of the measurement mode of the inner circumference length of a low edge cogged V belt. It is a perspective view of the low-edge cogged V-belt and two low-edge V-belts compared in Examples. It is explanatory drawing of the geometric data of the low edge cogged V belt and two low edge V belts compared in an Example. It is the result of the state of the stress distribution and the Mises stress maximum value of the low-edge cogged V-belt and the two low-edge V-belts compared in the examples.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of a belt transmission device 100 for driving an auxiliary machine using two transmission V-belts 1 and a transmission V-belt 2 as an example of the present invention. The belt transmission device 100 includes a drive pulley 3 and a driven pulley 4, and two transmission V-belts 1 and a transmission V-belt 2 are wound between the drive pulley 3 and the driven pulley 4. This is a simple example. The transmission V-belt 1 and the transmission V-belt 2 each have a V-shaped side surface (V-shaped (wedge-shaped) side surface) in a cross-sectional view in the width direction of the drive pulley 3 and the driven pulley 4. The outer peripheral surface is provided with V-shaped grooves 31 and 41 facing both side surfaces of the transmission V-belt 1 and both side surfaces of the transmission V-belt 2. The entire surfaces of the transmission V-belt 2 are in contact with the drive pulley 3 and the V-shaped grooves 31 and 41 of the driven pulley 4. By contacting the entire surfaces of both side surfaces of the transmission V-belt 2, the transmission capacity and lateral pressure resistance of the transmission V-belt 2 can be increased.

(Structure of V-belt 1 for transmission)
As shown in FIG. 1, the transmission V-belt 1 according to an example of the embodiment of the present invention is formed in the V-shaped groove 31 of the drive pulley 3 and the V-shaped groove 41 of the driven pulley 4 from the transmission V-belt 2. Is also wrapped around the outer circumference. The transmission V-belt 1 has a structure in which an stretch rubber layer 11, an adhesive rubber layer 12, and a compression rubber layer 13 are sequentially laminated from the outer peripheral side to the inner peripheral side. A core wire 14 (corresponding to a tension body) extending along the longitudinal direction of the belt is embedded in the adhesive rubber layer 12.

As shown in FIG. 2, the core wire 14 is arranged at the central portion in the thickness direction of the transmission V-belt 1. When the transmission V-belt 1 in which the core wire 14 is embedded is bent, it bends around the core wire 14. When the core wire 14 is on the outer peripheral side of the center in the thickness direction of the belt, the resistance for bending the inner peripheral side of the transmission V-belt 1 increases, and the flexibility decreases. Similarly, when the core wire 14 is on the inner peripheral side of the center in the thickness direction of the belt, the resistance for bending the outer peripheral side of the transmission V-belt 1 increases, and the flexibility decreases. Therefore, by arranging the core wire 14 in the central portion of the transmission V-belt 1 in the thickness direction, the flexibility of the transmission V-belt 1 is improved in a well-balanced manner. From the viewpoint of manufacturing efficiency and the like, the core wire 14 does not have to be arranged at the central portion of the transmission V-belt 1 in the thickness direction. That is, in the present embodiment, "the core wire 14 (tensile body) is arranged in the central portion in the thickness direction of the transmission V-belt 1" is not limited to being arranged in the true central portion. Including the case where the length of the transmission V-belt 1 is 1/10 of the thickness of the transmission V-belt 1 in the vertical direction from the true central portion.

The stretch rubber layer 11, the adhesive rubber layer 12, and the compressed rubber layer 13 are formed of a rubber composition containing a rubber component (that is, the transmission V-belt 1 is made of rubber). Further, the rubber composition constituting the stretched rubber layer 11 and the compressed rubber layer 13 contains short fibers.

As the rubber component, vulverable or crosslinkable rubber may be used, for example, diene rubber (natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (nitrile rubber), Nitrile hydride rubber, etc.), ethylene-α-olefin elastomer, chlorosulfonized polyethylene rubber, alkylated chlorosulphonized polyethylene rubber, epichlorohydrin rubber, acrylic rubber, silicone rubber, urethane rubber, fluororubber, or one of them. A combination of two or more types may be used. Preferred rubber components are ethylene-α-olefin elastomer (ethylene-propylene copolymer (EPM), ethylene-propylene-diene ternary copolymer (EPDM), etc.), and chloroprene rubber. A particularly preferable rubber component is chloroprene rubber. The chloroprene rubber may be either a sulfur-modified type or a non-sulfur-modified type.

Additives may be added to the rubber composition. Examples of the additive include a vulcanizing agent or a cross-linking agent (or a cross-linking agent) (sulfur-based vulcanizing agent, etc.), a co-crossing agent (bismaleimides, etc.), a vulcanization aid or a vulcanization accelerator (chiuram-based). Accelerators, etc.), vulcanization retardants, metal oxides (zinc oxide, magnesium oxide, calcium oxide, barium oxide, iron oxide, copper oxide, titanium oxide, aluminum oxide, etc.), reinforcing agents (eg, carbon black, water-containing) Silicon oxides such as silica), fillers (clay, calcium carbonate, talc, mica, etc.), softeners (for example, oils such as paraffin oil and naphthenic oil), processing agents or processing aids (stearic acid, stear) Acid metal salts, waxes, paraffins, fatty acid amides, etc.), anti-aging agents (antioxidants, heat anti-aging agents, bending crack inhibitors, ozone deterioration inhibitors, etc.), colorants, tackifiers, plasticizers, cups A ring agent (silane coupling agent, etc.), a stabilizer (ultraviolet absorber, heat stabilizer, etc.), a flame retardant, and an antistatic agent may be used in combination of one or more. The metal oxide may act as a cross-linking agent. Further, in particular, the rubber composition constituting the adhesive rubber layer 12 may contain an adhesiveness improving agent (resorcin-formaldehyde cocondensate, amino resin, etc.).

Examples of the short fibers include polyolefin fibers (polyethylene fiber, polypropylene fiber, etc.), polyamide fibers (polyamide 6 fiber, polyamide 66 fiber, polyamide 46 fiber, aramid fiber, etc.), and polyalkylene allylate fiber (for example, polyethylene terephthalate (for example, polyethylene terephthalate). _{Synthetic fibers such as C 2-4} alkylene C _6-14 allylate fiber), vinylon fiber, polyvinyl alcohol fiber, polyparaphenylene benzobisoxazole (PBO) fiber such as PET) fiber, polyethylene naphthalate (PEN) fiber, etc. A combination of one or more of natural fibers such as cotton, hemp and wool; and inorganic fibers such as carbon fibers may be used. In order to improve the dispersibility and adhesiveness in the rubber composition, the short fibers may be subjected to a conventional adhesive treatment (or surface treatment), for example, the short fibers may be treated with a resorcin-formalin-latex (RFL) solution or the like. May be processed.

The rubber compositions constituting the stretched rubber layer 11, the adhesive rubber layer 12, and the compressed rubber layer 13 may be the same as each other or may be different from each other. Similarly, the short fibers contained in the stretched rubber layer 11 and the compressed rubber layer 13 may be the same as each other or may be different from each other.

In the adhesive rubber layer 12, core wires 14 extend spirally in the longitudinal direction of the belt and are arranged apart from each other at a predetermined pitch in the width direction of the belt.

The core wire 14 is composed of, for example, a twisted cord using a multifilament yarn (for example, multiple twists, single twists, rung twists). The average wire diameter of the core wire 14 (fiber diameter of the twisted cord) may be, for example, 0.5 to 3 mm, preferably 0.6 to 2.0 mm, and more preferably about 0.7 to 1.5 mm.

As the fiber constituting the core wire 14, the fiber exemplified as the short fiber may be used. From the viewpoint of high modulus, as fibers constituting the core wire 14, polyamide fibers (polyamide 6 fibers, polyamide 66 fibers, polyamide 46 fibers, aramid fibers, etc.), polyalkylene allylate fibers (for example, polyethylene terephthalate (PET) fibers, etc.), _{Synthetic fibers such as C 2-4} alkylene C _6-14 allylate fibers such as polyethylene naphthalate (PEN) fibers; inorganic fibers such as carbon fibers may be used, and in particular, polyamide fibers and polyalkylene allylate fibers may be used. It is preferable to use it. The fiber constituting the core wire 14 may be a multifilament yarn. The fineness of the core wire 14 composed of the multifilament yarn may be, for example, about 2000 to 10000 denier (particularly 4000 to 8000 denier). The multifilament yarn may contain, for example, 100 to 5000 yarns, preferably 500 to 4000 yarns, and more preferably 1000 to 3000 yarns of monofilament yarns. The core wire 14 may be subjected to a conventional adhesive treatment (or surface treatment) as in the case of short fibers.

(Structure of V-belt 2 for transmission)
As shown in FIG. 1, the transmission V-belt 2 according to an example of the embodiment of the present invention is formed in the V-shaped groove 31 of the drive pulley 3 and the V-shaped groove 41 of the driven pulley 4 from the transmission V-belt 1. Is also wrapped around the inner circumference. Like the transmission V-belt 1, the transmission V-belt 2 has a structure in which an extension rubber layer 21, an adhesive rubber layer 22, and a compression rubber layer 23 are sequentially laminated from the outer peripheral side to the inner peripheral side. .. A core wire 24 extending along the longitudinal direction of the belt is embedded in the adhesive rubber layer 22. Like the transmission V-belt 1, the core wire 24 is arranged at the central portion of the transmission V-belt 2 in the thickness direction as shown in FIG. From the viewpoint of manufacturing efficiency and the like, the core wire 24 does not have to be arranged at the central portion of the transmission V-belt 2 in the thickness direction.

The constituent materials of the stretch rubber layer 21, the adhesive rubber layer 22, the compression rubber layer 23, and the core wire 24 in the transmission V-belt 2 are the same as those of the transmission V-belt 1. However, the rubber hardness of the compressed rubber layer 23 of the transmission V-belt 2 is adjusted to be lower than the rubber hardness of the compression rubber layer 13 of the transmission V-belt 1. The transmission V-belt 2 wound around the inner peripheral side of the V-shaped groove 31 or the V-shaped groove 41 has a smaller winding radius than the transmission V-belt 1 wound around the outer peripheral side, and therefore has a higher bending radius. Since property is required, the rubber hardness of the inner peripheral side (compressed rubber layer 23) of the transmission V-belt 2 is lower than the rubber hardness of the inner peripheral side (compressed rubber layer 13) of the transmission V-belt 1. There is. As a result, the relative flexibility of the transmission V-belt 2 wound around the inner peripheral side of the V-shaped groove 31 and the V-shaped groove 41 can be ensured. From the viewpoint of manufacturing efficiency (common material), the rubber hardness of the compressed rubber layer 23 of the transmission V-belt 2 and the rubber hardness of the compression rubber layer 13 of the transmission V-belt 1 may be the same.

(Dimensional conditions of transmission V-belt 1 and transmission V-belt 2)
Next, the dimensional conditions (relationship) between the transmission V-belt 1 and the transmission V-belt 2 will be described.

(Relationship between the inner peripheral surface of the transmission V-belt 1 and the outer peripheral surface of the transmission V-belt 2)
As shown in FIG. 2, the outer peripheral length Lо2 of the transmission V-belt 2 is designed to be equal to or less than the inner peripheral length Li1 of the transmission V-belt 1. Further, as shown in FIG. 2, the upper width Wо2 on the outer peripheral side of the transmission V-belt 2 is designed to be equal to or less than the lower width Wi1 on the inner peripheral side of the transmission V-belt 1. As a result, the outer peripheral surface of the transmission V-belt 2 wound around the inner peripheral side of the V-shaped groove 31 and the V-shaped groove 41 and the outer peripheral side of the V-shaped groove 31 and the V-shaped groove 41 are wound. It is possible to prevent the V-belt 1 for transmission from interfering with the inner peripheral surface. If the upper width Wо2 on the outer peripheral side of the transmission V-belt 2 is larger than the lower width Wi1 on the inner peripheral side of the transmission V-belt 1, as shown in FIG. 3A, the transmission V-belt 1 and the transmission are transmitted. This is because the power V-belt 2 interferes with the transmission V-belt 1 and the transmission V-belt 1 cannot contact the V-shaped groove 31 and the V-shaped groove 41, so that power cannot be transmitted.

Further, the outer peripheral length Lо2 of the transmission V-belt 2 and the inner peripheral length Li1 of the transmission V-belt 1 are designed to have the same length, and the upper width Wо2 on the outer peripheral side of the transmission V-belt 2 and the transmission V-belt 1 When the lower width Wi1 on the inner peripheral side of the above is designed to have the same length, as shown in FIG. 3B, the transmission V-belt 1 and the transmission V-belt 2 overlap each other without a gap. In this case, it is possible to minimize the difference in force applied to the transmission V-belt 1 and the transmission V-belt 2 while preventing the transmission V-belt 1 and the transmission V-belt 2 from interfering with each other. Specifically, when two transmission V-belts are wound around the drive pulley 3, etc., the force is not evenly applied to the transmission V-belt 1 on the outer peripheral side and the transmission V-belt 2 on the inner peripheral side. The pain of either transmission V-belt may be accelerated, but by making the gap between the transmission V-belt 1 and the transmission V-belt 2 as small as possible (preferably no gap), the transmission is used. The life of the transmission V-belt 1 and the transmission V-belt 2 can be extended by minimizing the difference in force applied to the V-belt 1 and the transmission V-belt 2.

Further, the outer peripheral length Lо2 of the transmission V-belt 2 is designed to be shorter than the inner peripheral length Li1 of the transmission V-belt 1, and the upper width Wо2 on the outer peripheral side of the transmission V-belt 2 is inside the transmission V-belt 1. When designed to be shorter than the lower width Wi1 on the peripheral side, a gap Z is formed between the transmission V-belt 1 and the transmission V-belt 2 as shown in FIG. 3C. Therefore, it is possible to prevent the transmission V-belt 1 and the transmission V-belt 2 from interfering with each other. Thereby, the lateral pressure resistance, flexibility, quietness, durability, and transmission capacity of the transmission V-belt 1 and the transmission V-belt 2 can be further improved. Further, by forming a gap Z between the transmission V-belt 1 and the transmission V-belt 2, heat dissipation can be improved, and the life of the transmission V-belt 1 and the transmission V-belt 2 is extended. be able to.

For the measurement of the outer peripheral length and the inner peripheral length of the transmission V-belt 1 (transmission V-belt 2), a method of measuring along a steel tape measure specified in JISB7512 (2018) can be exemplified.

Further, as a method of measuring the upper width and the lower width of the transmission V-belt 1 (transmission V-belt 2), first, the cross-sectional shape of the transmission V-belt 1 (transmission V-belt 2) viewed in the width direction is contoured. After measurement with a shape measuring machine (“CBH-1” manufactured by Mitutoyo Co., Ltd.), the shapes of both side surfaces, the upper surface, and the lower surface having a V shape are linearly approximated as shown in FIG. When obtaining an approximate straight line on both side surfaces having a V shape, a portion having a seemingly different angle such as a trim cut portion is not included. The upper width is the distance between the intersection of the approximate straight line drawn by the upper surface and the approximate straight line drawn by both sides of the V shape. Similarly, the lower width is the distance between the intersection of the approximate straight line drawn by the lower surface and the approximate straight line drawn by the V-shaped side surfaces.

When the width of the outer peripheral surface of the transmission V-belt is measured, the influence of the presence or absence of the trim cut and the size of the trim cut becomes large, which is inappropriate as the "effective width". Therefore, according to the above-mentioned method for measuring the upper width, it is possible to measure the "effective width" originally possessed by the transmission V-belt, which is not affected by the presence or absence of the trim cut and the size of the trim cut. Further, it can be used as a useful value for comparing the relationship (ratio) between the upper width and the thickness of the transmission V-belt, which will be described later.

(Relationship between the angle formed by both sides of the transmission V-belt 1 and the angle formed by both sides of the transmission V-belt 2)
As described above, the transmission V-belt 1 and the transmission V-belt 2 have V-shaped side surfaces in a cross-sectional view in the width direction. Then, as shown in FIG. 4, the angle A2 formed by both side surfaces of the transmission V-belt 2 is designed to be larger than the angle A1 formed by both side surfaces of the transmission V-belt 1.

Generally, when the transmission V-belt is wound around the V-shaped groove of the pulley, the compressed rubber layer (inner circumference side) is compressed in the longitudinal direction of the belt while expanding in the width direction of the belt (see FIG. 5). The stretchable rubber layer (outer peripheral side) is stretched in the longitudinal direction of the belt while contracting in the width direction of the belt (see FIG. 5). Therefore, the angle (V angle) formed by both side surfaces of the transmission V-belt is smaller than that before winding the pulley. The degree to which the formed angle (V angle) becomes small correlates with the winding radius to the pulley, and the smaller the winding radius, the smaller the formed angle (V angle). That is, the angle (V angle) formed by the transmission V-belt wound around the inner peripheral side of the V-shaped groove of the pulley is the angle formed by the transmission V-belt wound around the outer peripheral side of the V-shaped groove 31 of the pulley. There is a strong tendency for it to be smaller than (V angle).

Therefore, by pre-designing the angle A2 formed by both side surfaces of the transmission V-belt 2 to be larger than the angle A1 formed by both side surfaces of the transmission V-belt 1, the V-shaped groove 31 of the drive pulley 3 and the V-shaped groove 31 When the transmission V-belt 1 and the transmission V-belt 2 are overlapped and wound around the V-shaped groove 41 of the driven pulley 4, the angle A2 formed by both side surfaces of the transmission V-belt 2 and the transmission V-belt 1 The angle A1 formed by both side surfaces of the above is equalized.

From the viewpoint of manufacturing efficiency, the angle A2 formed by both side surfaces of the transmission V-belt 2 may be the same as the angle A1 formed by both side surfaces of the transmission V-belt 1.

Further, as a method of measuring the angle (V angle) formed by both side surfaces of the transmission V-belt 1 (transmission V-belt 2), first, a cross-sectional view of the transmission V-belt 1 (transmission V-belt 2) in the width direction is performed. After measuring the cross-sectional shape with a contour shape measuring machine (“CBH-1” manufactured by Mitutoyo Co., Ltd.), both side surfaces having a V shape are linearly approximated as shown in FIG. Then, the angle (acute angle) formed by these two approximate straight lines obtained is measured as the V angle. When obtaining an approximate straight line, a portion having a seemingly different angle, such as a trim cut portion, is not included (see FIG. 9).

(Relationship between the thickness of the transmission V-belt 1 and the thickness of the transmission V-belt 2)
The thickness of the transmission V-belt 2 is designed to be thinner than the thickness of the transmission V-belt 1. The transmission V-belt 2 wound around the inner peripheral side of the V-shaped groove 31 or the V-shaped groove 41 has a smaller winding radius than the transmission V-belt 1 wound around the outer peripheral side, and therefore has a higher bending radius. Since the property is required, the thickness of the transmission V-belt 2 is made thinner than the thickness of the transmission V-belt 1. As a result, the relative flexibility of the transmission V-belt 2 wound around the inner peripheral side of the V-shaped groove 31 and the V-shaped groove 41 can be ensured. From the viewpoint of manufacturing efficiency, the thickness of the transmission V-belt 2 and the thickness of the transmission V-belt 1 may be the same.

The thickness of the transmission V-belt 1 and the transmission V-belt 2 can be exemplified by a method of measuring with a caliper specified in JISB7507 (2016).

(Relationship between upper width and thickness of transmission V-belt 1 and transmission V-belt 2)
The transmission V-belt 1 is designed so that the relationship between the upper width Wо1 on the outer peripheral side and the thickness T1 satisfies the condition of 4 <upper width Wо1 / thickness T1 <8. Further, the transmission V-belt 2 is also designed so that the relationship between the upper width Wо2 on the outer peripheral side and the thickness T2 satisfies the condition of 4 <upper width Wо2 / thickness T2 <8.

In the present embodiment, since the lateral pressure resistance can be increased by using two transmission V-belts 1 and transmission V-belts 2, the thickness of each belt can be made relatively thin, and the upper width / upper width / The value of the thickness can be made larger than the conventional value (in the case of one transmission V-belt). Then, when the value of the upper width / thickness is 4 or less, the flexibility is lowered. On the other hand, when the value of upper width / thickness is 8 or more, the lateral pressure resistance is lowered. Therefore, by making the values of the upper width / thickness satisfy the above conditions, the flexibility and the lateral pressure resistance can be improved in a well-balanced manner. In particular, the upper width / thickness value is preferably 4.5 or more from the viewpoint of improving flexibility, and the upper width / thickness value is 6 or less (particularly, 5.) from the viewpoint of improving lateral pressure resistance. 5 or less) is preferable.

The transmission V-belt 2 having the above configuration is wound around the V-shaped groove 31 of the drive pulley 3 and the V-shaped groove 41 of the driven pulley 4 of the belt transmission device 100, and the transmission V-belt 1 is further used for transmission. When the vehicle is wound around the upper side of the V-belt 2 and traveled (how to use a set of a plurality of transmission V-belts, see FIG. 1), it is placed on the inner peripheral side of the V-shaped groove 31 and the V-shaped groove 41. It is possible to prevent the upper surface of the wound transmission V-belt 2 from excessively interfering with the lower surface of the transmission V-belt 1 wound around the outer peripheral side.
Thereby, the lateral pressure resistance, flexibility, quietness, durability, and transmission capacity of the transmission V-belt 1 and the transmission V-belt 2 can be improved.

The block belt described in Patent Document 2 transmits power while transmitting pressure between blocks. Therefore, the transmission capacity is determined by the strength and size of the block, and even if a plurality of thin belts are wound, the transmission capacity cannot be increased. Even if it is possible to increase the transmission capacity by winding a plurality of non-thin belts, it is not preferable because a large space is required for that purpose. On the other hand, the transmission V-belt having a core wire (tensile body) transmits power as tension applied to the core wire. Therefore, the transmission capacity can be increased by winding a plurality of thin transmission V-belts to increase the ratio of the core wires included in the unit cross-sectional area (for example, the number of twisted cords).

(Manufacturing method of transmission V-belt 1 and transmission V-belt 2)
Next, a method of manufacturing the transmission V-belt 1 and the transmission V-belt 2 will be described.

The method for manufacturing the transmission V-belt 1 and the transmission V-belt 2 according to the present embodiment is as follows: unvulcanized sleeve forming step S1, vulcanization step S2, belt prototype forming step S3, V-cutting step S4, peeling step S5, and , The polishing step S6 is included.

The unvulcanized sleeve forming step S1 is a step of forming an annular unvulcanized sleeve. In the unvulcanized sleeve forming step S1, a cylindrical drum is used, and as shown in FIG. 10, a second unvulcanized rubber sheet for the compressed rubber layer, which becomes the compressed rubber layer 23, is placed on the outer peripheral surface of the drum. A second belt sheet including a second unvulcanized rubber sheet for the adhesive rubber layer to be the wire 24 and the adhesive rubber layer 22, a second unvulcanized rubber sheet for the stretchable rubber layer to be the stretchable rubber layer 21, and a release layer sheet. The first unvulcanized rubber sheet for the compressed rubber layer to be the compressed rubber layer 13, the core wire 14, the first unvulcanized rubber sheet for the adhesive rubber layer to be the adhesive rubber layer 12, and the stretched rubber to be the stretched rubber layer 11. The first belt sheet including the first unvulcanized rubber sheet for the layer is laminated in order. That is, the release layer sheet is sandwiched between the first belt sheet and the second belt sheet and laminated.

The release layer sheet is preferably one having excellent releasability from the first unvulcanized rubber sheet for the compressed rubber layer and the second unvulcanized rubber sheet for the stretched rubber layer. Specifically, it may be a resin film, and "Lumirror (registered trademark)" manufactured by Toray Industries, Inc., which is a polyester film, can be used.

Specifically, first, a plurality of sheet members containing short fibers and laminated with each other are used as a second unvulcanized rubber sheet for a compression rubber layer, and the short fibers of each sheet member are oriented in the belt width direction. Wrap it on a cylindrical drum. Then, the core wire 24 is spirally spun on the second unvulcanized rubber sheet for the compressed rubber layer. Then, the second unvulcanized rubber sheet for the adhesive rubber layer is laminated on the core wire 24. Then, the second unvulcanized rubber sheet for the stretched rubber layer is laminated on the second unvulcanized rubber sheet for the adhesive rubber layer. Then, the release layer sheet is laminated on the second unvulcanized rubber sheet for the stretch rubber layer. After that, a plurality of sheet members containing short fibers and laminated with each other on the release layer sheet are used as the first unvulcanized rubber sheet for the compression rubber layer, and the short fibers of each sheet member are oriented in the belt width direction. Let and stack. Then, the core wire 14 is spirally spun on the first unvulcanized rubber sheet for the compressed rubber layer. Then, the first unvulcanized rubber sheet for the adhesive rubber layer is laminated on the core wire 14. Then, the first unvulcanized rubber sheet for the stretch rubber layer is laminated on the first unvulcanized rubber sheet for the adhesive rubber layer.

Next, the vulcanization step S2 is a step of vulcanizing the obtained unvulcanized sleeve to form an annular vulcanized sleeve after the unvulcanized sleeve forming step S1. In the vulcanization step S2, a known method may be adopted. For example, the vulcanization jacket is put on the outside of the unvulcanized sleeve, the mold is installed in the vulcanization can, and the temperature is 120 to 200 ° C. (particularly 150 to 180). The unvulcanized sleeve may be vulcanized at about ° C.).

In the next belt prototype forming step S3, after the vulcanization jacket and the vulcanization sleeve are removed from the vulcanization can, the vulcanization sleeves are cut at predetermined width intervals to obtain a plurality of belt prototypes.

In the next V-cut step S4, as shown in FIG. 10, the obtained belt prototype is cut into a V shape with a cutter or the like so that a predetermined V angle can be obtained in a cross-sectional view in the width direction. The belt prototype forming step S3 and the V-cut step S4 may be performed in the same step. Further, a belt prototype having a predetermined width and a predetermined V angle may be obtained by cutting the vulcanization sleeve into a V shape in the V cutting step S4 without cutting the belt prototype in the predetermined width in the belt prototype forming step S3.

Subsequently, in the peeling step S5, as shown in FIG. 10, the belt prototype peeling layer sheet cut into a V shape is peeled off and removed. As a result, the transmission V-belt 1 is obtained from the vulcanized first belt sheet portion, and the transmission V-belt 2 is obtained from the vulcanized second belt sheet portion.

Further, in the polishing step S6, both side surfaces of the transmission V-belt 1 and transmission are made so that the angle A2 formed by both side surfaces of the transmission V-belt 2 is larger than the angle A1 formed by both side surfaces of the transmission V-belt 1. Both sides of the V-belt 2 for use are cut or polished.

By the above manufacturing method, the transmission V-belt 1 and the transmission V-belt 2 according to the present embodiment can be obtained at the same time. The polishing step S6 may be omitted from the viewpoint of manufacturing efficiency and the like. In this case, a set of transmission V-belts having the same angle A2 formed by both side surfaces of the transmission V-belt 2 and the angle A1 formed by both side surfaces of the transmission V-belt 1 can be obtained.

In the unvulcanized sleeve forming step S1, the stacking order may be completely reversed from the above order, and the product may be manufactured by so-called reverse molding (in this case, the transmission V-belt 1 and the transmission V-belt 2). (Insert the process of reversing the outer peripheral side and the inner peripheral side of).

According to the above manufacturing method, the two transmission V-belts 1 and the transmission V-belt 2 are compared with the case where the two transmission V-belts 1 and the transmission V-belts 2 are manufactured from separate belt sleeves. The belt length (outer circumference length, inner circumference length), width (upper width, lower width), V angle (angle formed by both side surfaces) and the like can be accurately matched.

As described above, it is preferable that the transmission V-belt 1 and the transmission V-belt 2 according to the present embodiment are handled as a set of two.

(Embodiment 2)
In the second embodiment, as shown in FIG. 6, the transmission V-belt 1 and the transmission V-belt 2 according to the first embodiment are collectively covered with the cloth 6. The cloth 6 is made of, for example, a woven cloth, a wide-angle woven cloth, a knitted cloth, a non-woven fabric or the like (preferably a woven cloth).

When the two transmission V-belts 1 and the transmission V-belt 2 are independent as in the first embodiment, there is a possibility that the transmission V-belt 1 and the transmission V-belt 2 may interfere with each other due to vibration. However, by covering the two transmission V-belts 1 and the transmission V-belts 2 together with the cloth 6, it is possible to prevent them from interfering with each other due to vibration. Although it looks like one transmission belt on the outside, the contents are divided into two transmission V-belts 1 and transmission V-belts 2 independently, so one thick transmission belt is used. Flexibility does not decrease as in the case of using a V-belt.

(Embodiment 3)
In the third embodiment, as shown in FIG. 7, the transmission V-belt 1 and the transmission V are between the transmission V-belt 1 and the transmission V-belt 2 coated with the cloth 6 according to the second embodiment. A sensor 7 for detecting the state of at least one of the belts 2 is arranged.

Examples of the sensor 7 include a pressure sensor using a piezoelectric element that generates an electric charge when a pressure is received. The pressure sensor arranged between the transmission V-belt 1 and the transmission V-belt 2 can detect and observe the pressure applied to the transmission V-belt 1 and the transmission V-belt 2. Then, depending on the detected / observed pressure value, the degree of deterioration / damage of the transmission V-belt 1 and the transmission V-belt 2, the drive pulley 3 around which the transmission V-belt 1 and the transmission V-belt 2 are wound, and the driven It is possible to grasp the abnormality of the pulley 4 and the like.

Further, the sensor 7 may be a temperature sensor. If the transmission V-belt 1 and the transmission V-belt 2 are continuously used under various external and internal pressures applied to the transmission V-belt 1 and the transmission V-belt 2, the internal temperature rises due to the pressure and further friction. Due to the influence of heat and the like, the internal temperature of the transmission V-belt 1 and the transmission V-belt 2 rises. Therefore, by detecting and observing the internal temperature of the transmission V-belt 1 and the transmission V-belt 2 by the temperature sensor arranged between the transmission V-belt 1 and the transmission V-belt 2, the transmission V-belt 1 is detected and observed. It is possible to grasp the deterioration and damage of 1 and the transmission V-belt 2.

Here, as a mode in which the sensor 7 is arranged between the transmission V-belt 1 and the transmission V-belt 2, the sensor 7 is placed on the inner peripheral surface of the transmission V-belt 1 or the outer circumference of the transmission V-belt 2. The inner peripheral surface of the transmission V-belt 1 may be attached to the surface with an adhesive tape, attached with an adhesive, or simply sandwiched between the transmission V-belt 1 and the transmission V-belt 2. The sensor 7 is used in contact with the outer peripheral surface of the transmission V-belt 2.

Conventionally, when a sensor for detecting the state of a transmission V-belt is to be attached to a transmission V-belt, it is embedded in the transmission V-belt, but a vulcanization process is performed in the transmission V-belt manufacturing process. Since it is necessary, there are restrictions on the types of sensors that can be used (heat resistance, pressure resistance, etc.). However, according to the above configuration, since the sensor 7 can be installed between the already completed transmission V-belt 1 and the transmission V-belt 2, the types of sensors 7 that can be used increase, and the versatility is improved. .. Further, when the sensor is embedded in the transmission V-belt as in the conventional case, there is a concern that the sensor acts as a foreign substance and becomes a starting point of cracks to shorten the life of the belt. If so, that concern can be reduced.

In the third embodiment, the configuration in which the sensor 7 is arranged between the transmission V-belt 1 and the transmission V-belt 2 covered with the cloth 6 has been described, but the cloth 6 may be omitted, and simply, The sensor 7 may be arranged between the transmission V-belt 1 and the transmission V-belt 2.

(Other embodiments)
In the first to third embodiments, the case where the number of transmission V-belts wound around the V-shaped groove 31 of the drive pulley 3 and the V-shaped groove 41 of the driven pulley 4 is two has been described, but three or more. You may wrap it.

In the method of manufacturing a set of three or more transmission V-belts, in the unvulcanized sleeve forming step S1, the belt sheet corresponding to the increased number of belts and the release layer sheet are laminated to form three or more transmission V-belts. V-belts can be manufactured at the same time. For example, in the method of manufacturing a set of three transmission V-belts, the first belt sheet, the release layer sheet, the second belt sheet, the release layer sheet, and the third belt sheet are laminated in this order.

-In the first embodiment, the transmission V-belt 1 and the transmission V-belt 2 having a structure in which the stretch rubber layer, the adhesive rubber layer in which the core wire is embedded, and the compression rubber layer are sequentially laminated have been described. The rubber layer may not be provided, and the core wire may be arranged between the stretched rubber layer and the compressed rubber layer. Further, the transmission V-belt 1 and the transmission V-belt 2 may have a configuration in which an adhesive rubber layer is provided between the stretch rubber layer and the core wire and / or between the compression rubber layer and the core wire.

Further, the transmission V-belt 1 and the transmission V-belt 2 may have a configuration in which a reinforcing cloth is provided on the outer peripheral surface of the stretch rubber layer and / or the inner peripheral surface of the compression rubber layer.

-In the first embodiment, the transmission V-belt 1 and the transmission V-belt 2 of the low-edge (Raw-Edge) type (low-edge V-belt), which is a rubber layer in which the friction transmission surface (V-shaped side surface) is exposed, are exemplified. As described above, any transmission V-belt having a V-shaped friction transmission surface may be used, and a wrapped type (wrapped V-belt) transmission V-belt whose friction transmission surface is covered with a cover cloth may be used. You may use it. However, a low-edge type belt is preferable because it has a large coefficient of friction and can improve the transmission capacity. The low-edge type belt may be a low-edge V-belt without a cog, and a low-edge cogged V-belt or a belt with a cog only on the lower surface (inner peripheral surface) of the belt in order to improve flexibility. A low-edge double-cogged V-belt in which cogs are provided on both the lower surface and the upper surface (outer peripheral surface) of the belt may be used.

To measure the inner circumference of the low-edge cogged V-belt, measure the length of the steel tape measure specified in JISB7512 (2018) along the top of the cog on the inner circumference side (see FIG. 11). .. Similarly, in order to measure the outer peripheral length of the low-edge double cogged V-belt, the length is measured along the top of the cog on the outer peripheral side with a steel tape measure specified in JISB7512 (2018). Further, when measuring the thickness of a V-belt with a cog such as a low-edge cogged V-belt or a low-edge double-cogged V-belt, the thickness at the top of the cog is measured. For example, in the case of a low-edge double cogged V-belt, the distance between the top of the cog on the inner peripheral side and the top of the cog on the outer peripheral side is measured as the thickness.

A V-belt with a cog, such as a low-edge cogged V-belt or a low-edge double-cogged V-belt, can improve flexibility, but tends to generate abnormal noise due to the periodicity of the cog. Further, there is a problem that the lateral pressure resistance is lowered because the contact area with the pulley is reduced, and there is a problem that stress is concentrated in the cog valley and cracks are likely to occur. On the other hand, the low-edge V-belt without the cog increases the contact area with the pulley and improves the lateral pressure resistance. Since the stress due to bending can be uniformly dispersed in the longitudinal direction of the belt, the occurrence of cracks can be suppressed and the belt life is improved. In addition, no abnormal noise is generated due to the periodicity of the cog, and the quietness is excellent. From the above viewpoint, a low edge type belt is preferable, and a low edge V belt without a cog is particularly preferable.

Next, the stress distribution in the case where one low-edge cogged V-belt is wound around the pulley and the case where two low-edge cogged V-belts that are thin and do not have a cog are overlapped and wound around the pulley. And Mises stress maximum values were compared by the finite element method (FEM). As the analysis program, a general-purpose nonlinear FEM program "Mark" manufactured by MSC of the United States was used. The geometric data (Table 1) and the physical property data are as follows, and an axial load of 800 N is applied as a force for winding the belt around the pulley. The comparison result is shown in FIG.

・ Low edge cogged V-belt (see Fig. 12)
The low-edge cogged V-belt is a laminate composed of an stretch rubber layer, an adhesive rubber layer, a core wire, and a compression rubber layer. The compressed rubber layer has a cog.
・ Low edge V-belt 1 (see Fig. 12) (corresponds to transmission V-belt 1)
It is a laminate composed of an stretch rubber layer, an adhesive rubber layer, a core wire, and a compression rubber layer. The stretched rubber layer and the compressed rubber layer do not have cogs.
・ Low edge V-belt 2 (see Fig. 12) (corresponding to transmission V-belt 2)
It is a laminate composed of an stretch rubber layer, an adhesive rubber layer, a core wire, and a compression rubber layer. The stretched rubber layer and the compressed rubber layer do not have cogs.
The low-edge V-belt 1 is wound around the V-shaped groove of the pulley on the outer peripheral side of the low-edge V-belt 2 (the low-edge V-belt 2 is wound around the V-shaped groove of the pulley on the inner peripheral side of the low-edge V-belt 1). Wrapped around). At this time, the low-edge V-belt 1 was overlapped in contact with the low-edge V-belt 2. The low-edge V-belt 1 and the low-edge V-belt 2 are independent of each other and are not bonded to each other.
-Pulley The pulley has a V-shaped groove provided on the outer circumference of the pulley with a groove angle of 28 ° and a pitch diameter of 95.5 mm.

(Geometric data)

(Physical characteristic data)
Stretch rubber layer and compression rubber layer (solid element, superelastic material: Mooney-Rivlin)
C10 = 3.72MPa, C01 = 0.93MPa
Adhesive rubber layer (solid element, superelastic material: Mooney-Rivlin)
C10 = 1.58MPa, C01 = 0.39MPa
Outer core layer (solid element, superelastic material: Mooney-Rivlin)
C10 = 6.67MPa, C01 = 1.67MPa
Inner core layer (truss element, linear material in tensile direction)
Young's modulus E = 28929 MPa, Poisson's ratio = 0.3

From the comparison result of FIG. 14, when two low-edge V-belts having a thin thickness and no cog are stacked and wound around the pulley, it is compared with the case where one thick low-edge cogged V-belt is wound around the pulley. It was confirmed that the stress was dispersed and the maximum stress value was reduced. It was confirmed that when two low-edge V-belts are stacked and wound around the pulley, improvement in flexibility and durability can be expected.

1 Transmission V-belt (outer circumference side)
11 Stretch rubber layer 12 Adhesive rubber layer 13 Compressed rubber layer 14 Core wire 2 Transmission V-belt (inner circumference side)
21 Stretch rubber layer 22 Adhesive rubber layer 23 Compressed rubber layer 24 Core wire 3 Drive pulley 31 V-shaped groove 4 Driven pulley 41 V-shaped groove 100 Belt transmission device Li1 Inner circumference of transmission V-belt 1 Lо2 Transmission V-belt Perimeter of 2 Wо1 Upper width of transmission V-belt 1 Wi1 Lower width of transmission V-belt 1 Wо2 Upper width of transmission V-belt 2

Claims (12)

It is a set of multiple transmission V-belts that are wound on top of each other in a V-shaped groove formed on the outer circumference of the pulley.
In the relationship between the transmission V-belts wound around the groove,
The outer peripheral length Lо2 of the transmission V-belt wound around the inner peripheral side of the groove is equal to or less than the inner peripheral length Li1 of the transmission V-belt wound around the outer peripheral side of the groove.
The upper width Wо2 on the outer peripheral side of the transmission V-belt, which is wound around the inner peripheral side of the groove, is the lower width Wi1 or less on the inner peripheral side of the transmission V-belt, which is wound around the outer peripheral side of the groove. A set of multiple transmission V-belts, characterized by being present. The outer peripheral length Lо2 of the transmission V-belt wound around the inner peripheral side of the groove is shorter than the inner peripheral length Li1 of the transmission V-belt wound around the outer peripheral side of the groove.
The upper width Wо2 on the outer peripheral side of the transmission V-belt, which is wound on the inner peripheral side of the groove, is larger than the lower width Wi1 on the inner peripheral side of the transmission V-belt, which is wound on the outer peripheral side of the groove. The set of a plurality of transmission V-belts according to claim 1, characterized in that they are short. Each of the transmission V-belts has a V shape in a cross-sectional view in the width direction.
The angle A2 formed by both side surfaces of the transmission V-belt wound around the inner peripheral side of the groove is larger than the angle A1 formed by both side surfaces of the transmission V-belt wound around the outer peripheral side of the groove. A set of a plurality of transmission V-belts according to claim 1 or 2, characterized in that. Each transmission V-belt is made of rubber and is made of rubber.
The rubber hardness of the inner peripheral side of the transmission V-belt wound around the inner peripheral side of the groove is lower than the rubber hardness of the inner peripheral side of the transmission V-belt wrapped around the outer peripheral side of the groove. A set of a plurality of transmission V-belts according to any one of claims 1 to 3, characterized in that. Claims 1 to 1, wherein the thickness of the transmission V-belt wound around the inner peripheral side of the groove is thinner than the thickness of the transmission V-belt wound around the outer peripheral side of the groove. A set of a plurality of transmission V-belts according to any one of 4. A tension body is embedded in each of the transmission V-belts along the longitudinal direction of the belt.
The set of a plurality of transmission V-belts according to any one of claims 1 to 5, wherein the tension body is arranged at a central portion in the thickness direction of each transmission V-belt. The set of a plurality of transmission V-belts according to any one of claims 1 to 6, wherein the plurality of transmission V-belts are collectively covered with a cloth. Claims 1 to 7 of each of the transmission V-belts are characterized in that the relationship between the upper width Wо on the outer peripheral side and the thickness T satisfies the condition of 4 <(upper width Wо / thickness T) <8. A set of a plurality of transmission V-belts according to any one of the above items. A sensor for detecting the state of the transmission V-belt is provided between the transmission V-belt wound on the inner peripheral side of the groove and the transmission V-belt wound on the outer peripheral side of the groove. The set of a plurality of transmission V-belts according to any one of claims 1 to 8, characterized in that they are arranged. In a transmission device provided with a plurality of pulleys having a V-shaped groove formed on the outer circumference.
A method of using a set of a plurality of transmission V-belts, which comprises stacking and winding a plurality of transmission V-belts around the grooves of each pulley. A plurality of belt sheets including a compression layer sheet, a tension body and an extension layer sheet, and a release layer sheet arranged between the belt sheets are laminated on the outer circumference of the cylindrical drum. After that, the process of vulcanizing to obtain a belt sleeve,
A step of cutting the belt sleeve at predetermined width intervals to obtain a plurality of belt prototypes.
A plurality of transmission Vs, which comprises a step of obtaining a plurality of transmission V-belts by removing the release layer sheet after cutting the belt prototype into a V shape in a cross-sectional view in the width direction. How to make a set of belts. The angle A2 formed by both side surfaces of the transmission V-belt, which is wound around the inner peripheral side of the V-shaped groove formed on the outer circumference of the pulley, is wound around the outer circumference of the groove. The set of a plurality of transmission V-belts according to claim 11, further comprising a step of cutting or polishing both side surfaces of the transmission V-belt so as to be larger than the angle A1 formed by both side surfaces. Manufacturing method.

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