JP6769913B2 - V-belt with mountain - Google Patents

Description

The present invention relates to a V-belt with a mountain that is used in agricultural machinery represented by a combine harvester and scoops and transports crops in the cutting work of grains such as rice, wheat, corn, and sugar cane.

A self-removing combine is an agricultural machine that has the function of threshing rice and wheat while cutting them, and transports the cut crops in an orderly manner and puts only the tips into the threshing machine. The mountain V-belt is incorporated in the cutting section located near the tip of the combine, and the same number of mountain V-belts as the number of cutting rows can be attached (for example, 5 for 5-row cutting).

The main function of the mountained V-belt is to cause the fallen crops due to the weight of ears and rainwater during the harvest season, and to transport the caused crops to the rotary cutter behind the mountainous V-belt. The transported crops are cut with a rotary cutter and then transported to the threshing section by a pickup tine attached to the chain.

In the V-belt with a mountain, the rubber portion is exposed on the outer peripheral surface of the endless belt body (so-called wrapped V-belt) in the circumferential direction of the belt body at the entire circumference or at predetermined intervals, and the exposed rubber portion has a mountain-shaped protrusion. This is a transport V-belt with parts (raised pieces) joined together. The belt body is formed in a trapezoidal shape in which the width of the outer peripheral surface is larger than the width of the inner peripheral surface, and the core wire is spirally embedded inside.

A V-belt with a mountain is wound around a V-belt drive device consisting of a two-axis V pulley and rotates. Normally, two V-belt drive devices, that is, two V-belts with a mountain are used as a crop. Relatively confront each other so as to sandwich. As a result, the crop can be scooped up and transported in a stable state.

The mountained V-belt is required to have flexibility to withstand the bending stress received when it is wound around the V pulley. That is, it is required that the mountain-shaped protrusion (raised piece) does not peel off or fall off even if the mountain-mounted V-belt is bent.

Therefore, in Patent Document 1, after coating the surface of the belt main body (wrapped V-belt) with an unvulcanized rubber sheet and attaching a group of mountain-shaped raised pieces made of unvulcanized rubber to the back surface side at a predetermined pitch. By vulcanization, the adhesive strength between the mountain-shaped raised pieces and the belt body is increased.

Further, in Patent Document 2, by providing a space of 0.1 to 10.0 mm between the hem and the hem of the adjacent ridges of the Yamatsuki V-belt, it is difficult for the ridges to fall off, and one is used. Even if a raised piece falls off, it does not lead to the falling off of other raised pieces.

Further, in Patent Document 3, the stress applied to the raised piece is relaxed by providing a gap portion for relaxing the stress applied to the raised piece at the hem portion of the mountain-shaped raised piece provided on the V-belt main body of the V-belt with a mountain. , Suppresses fatigue and peeling of raised pieces and improves the bending resistance of the belt.

On the other hand, in the V-belt with a mountain, the side where the angle between the raised piece and the belt body is an obtuse angle becomes the front side in the traveling direction and rotates, and while the crop hits the end face of the raised piece on the front side in the traveling direction, rice Repeat the function of scooping up. Therefore, in the raised piece, wear progresses only on one side (front side in the traveling direction). That is, when a V-belt with a mountain is used, the thickness of the raised piece end face on the front side in the belt traveling direction gradually decreases due to wear due to frictional force due to impact and sliding with the crop. As a result, the size (length) of the raised piece is shortened, the function of scooping the crop is lost, and the life due to this is dominated.

Therefore, in Patent Document 4, a block-shaped high-hardness rubber layer is embedded in the raised piece end surface on the front side in the traveling direction, and a low-hardness rubber layer is arranged in other portions to reduce bending resistance. There is no such thing, and the decrease in rigidity due to wear is suppressed.

JP-A-6-218843 Square root extraction No. 6-053524 Japanese Patent Application Laid-Open No. 10-218326 Japanese Unexamined Patent Publication No. 2000-44028

The damage phenomenon that is the reason for replacing the mountained V-belt in recent years is dominated by the deterioration of the transport function due to the wear of the raised pieces. With the configuration of Patent Document 4, the wear resistance of the raised piece end face on the front side in the traveling direction can be improved. However, in the configuration of Patent Document 4, the high hardness rubber layer increases bending fatigue at the joint interface between the raised piece and the belt body (decrease in bending resistance). Therefore, in the configuration of Patent Document 4, wear resistance and bending resistance (particularly, alleviation of bending fatigue at the joint interface between the raised piece and the belt body) cannot be sufficiently compatible with each other.

An object of the present invention is to provide a mountain V-belt capable of improving wear resistance and bending resistance, respectively.

INDUSTRIAL APPLICABILITY In a V-belt with a mountain used for agricultural machinery to scoop and transport crops, a belt main body that is endless and is rotated in the circumferential direction and a belt main body that is rotated in the circumferential direction are spaced apart from each other in the circumferential direction. Each of the raised pieces is joined to the outer peripheral surface of the belt body and has a raised piece extending in a direction protruding from the outer peripheral surface, and the raised piece has a low hardness rubber layer and a high hardness higher than the low hardness rubber layer. The low-hardness rubber layer is formed of a rubber layer, and the low-hardness rubber layer is formed by a first low-hardness rubber layer arranged at a base portion which is a joint portion with the belt main body and a rotation direction of the belt main body in the raised piece. On the rear side, there is a second low-hardness rubber layer arranged from the outer surface of the first low-hardness rubber layer to the middle of the protruding direction of the raised piece, and the high-hardness rubber layer is the raised piece. On the front side in the rotation direction of the belt body, the first high hardness rubber layer arranged from the outer surface of the first low hardness rubber layer to the tip of the raised piece, and the rear side of the raised piece in the rotation direction of the belt body. The second high-hardness rubber layer is provided from the outer surface of the second low-hardness rubber layer to the tip of the raised piece, and the direction orthogonal to the circumferential direction and the width direction of the belt body is the height direction. Then, the height of the first low-hardness rubber layer is 2% or more and 10% or less of the height of the raised piece.

According to the present invention, the raised piece is formed by a low hardness rubber layer and a high hardness rubber layer having a hardness higher than that of the low hardness rubber layer. The wear resistance of the raised piece can be improved by the first high hardness rubber layer arranged on the front side of the raised piece in the rotation direction of the belt body. Further, since the first high-hardness rubber layer and the second high-hardness rubber layer arranged on the rear side of the raised piece in the rotation direction of the belt body make the entire tip portion of the raised piece into a high-hardness rubber layer. Compared with the configuration in which the high hardness rubber layer is arranged only on the front side of the tip portion, the time required for the tip portion of the raised piece to be worn away due to wear and the transport capacity to be lowered can be lengthened. Further, the first low hardness rubber layer arranged at the base portion which is the joint portion with the belt main body can secure the adhesiveness with the belt main body. Further, the second low-hardness rubber layer arranged on the rear side of the raised piece in the rotation direction of the belt body can alleviate the repulsive force continuously received by the raised piece. Further, by setting the height of the first low-hardness rubber layer to 2% or more and 10% or less of the height of the raised piece, bending fatigue at the joint interface between the raised piece and the belt body can be alleviated. Thereby, wear resistance and bending resistance can be improved respectively.

It is a perspective view of the V-belt with a mountain. It is a perspective view of the wrapped V-belt. It is a side view of a raised piece. It is a chart figure which shows the manufacturing process of a wrapped V-belt. It is a perspective view of the unvulcanized sleeve. It is the whole view of the unvulcanized rubber belt. It is a perspective view of the unvulcanized rubber belt. It is explanatory drawing of the process of peeling off the outer cover cloth on the back surface of a wrapped V-belt all around. It is a side view of the unvulcanized rubber block. It is a schematic diagram which shows an example of the mold used for vulcanization adhesion. It is a side view of the lower board. It is a front view of the middle stage. It is explanatory drawing of the bench evaluation. It is sectional drawing of the wrapped V belt.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Composition of V-belt with mountain)
The V-belt with a mountain is used for agricultural machinery represented by a combine harvester, and scoops and transports crops in the cutting work of grains such as rice, wheat, corn, and sugar cane. As shown in FIG. 1, which is a perspective view, the mountained V-belt 1 has a wrapped V-belt (belt body) 2 and a raised piece 3.

The wrapped V-belt 2 is used as an endless power transmission belt for power transmission in general industrial machines such as compressors, agricultural machines such as rice transplanters, and the like. The wrapped V-belt 2 is configured as an annular transmission belt having a V-shaped cross section. The wrapped V-belt 2 is rotated in the circumferential direction.

As shown in FIG. 2, which is a perspective view, the wrapped V-belt 2 is formed in a trapezoidal shape in which the width of the outer peripheral surface (back surface) is larger than the width of the inner peripheral surface. That is, the cross-sectional shape of the wrapped V-belt 2 is a V-shape in which the belt width decreases from the outer peripheral side of the belt toward the inner peripheral side of the belt. The wrapped V-belt 2 has a compression rubber layer 4, an stretch rubber layer 5, a core wire 6, and an outer cover 7. Note that FIG. 2 shows a cross section perpendicular to the circumferential direction of the wrapped V-belt 2 extending in an annular shape. In FIG. 2, the double-ended arrow A is the circumferential direction of the wrapped V-belt 2, and the double-ended arrow B is the belt width direction orthogonal to the circumferential direction.

The wrapped V-belt 2 has a laminated structure, and the compressed rubber layer 4, the core wire 6, and the stretched rubber layer 5 are sequentially laminated from the inner peripheral side of the belt to the outer peripheral side of the belt. Therefore, in the wrapped V-belt 2, the core wire 6 is embedded between the compressed rubber layer 4 and the stretched rubber layer 5. The core wire 6 is arranged so as to extend along the circumferential direction A of the wrapped V-belt 2. The core wires 6 are arranged at predetermined intervals along the belt width direction B in a cross section orthogonal to the circumferential direction A of the wrapped V belt 2.

As the core wire 6, a twisted cord using a multifilament yarn (for example, various twists, single twist, rung twist, etc.) can be usually used. The average wire diameter of the core wire 6 (fiber diameter of the twisted cord) may be, for example, 0.5 to 3 mm, preferably 0.6 to 2 mm, and more preferably about 0.7 to 1.5 mm. The core wire 6 may be embedded in the longitudinal direction of the wrapped V-belt 2, and may be embedded in parallel at a predetermined pitch parallel to the longitudinal direction of the wrapped V-belt 2. The fibers constituting the core wire 6 are not particularly limited, and may include, for example, synthetic fibers such as polyester fibers (polyalkylene allylate fibers), polyamide fibers (aramid fibers, etc.), inorganic fibers such as carbon fibers, and the like. ..

Further, the entire circumference of the wrapped V-belt 2 is covered with the outer cover 7 over the entire length in the circumferential direction A.

Examples of the outer cover cloth 7 include woven cloth, knitted cloth (weft knitted cloth, warp knitted cloth), and non-woven fabric. Of these, woven fabrics woven in the form of plain weave, twill weave, red weave, etc., woven fabrics and knitted fabrics woven at a wide angle of more than 90 ° and 120 ° or less at the intersection angle of warp and weft are preferable. Weave cloth that is widely used as a cover cloth for transmission belts for general industry and agricultural machinery (plain weave cloth with a right angle of intersection between the warp and weft, and 120 ° with the intersection angle of the warp and weft exceeding 90 °. A plain weave cloth (wide angle canvas) having a wide angle of the following degree is particularly preferable.

Examples of the fibers constituting the outer cover 7 include polyolefin fibers (polyethylene fibers, polypropylene fibers, etc.), polyamide fibers (polyamide 6 fibers, polyamide 66 fibers, polyamide 46 fibers, aramid fibers, etc.), and polyalkylene allylate fibers (polyalkylene allylate fibers, etc.). Polyethylene terephthalate (PET) fiber, poly C2-4alkylene C6-14 allylate fiber such as polyethylene naphthalate (PEN) fiber), vinyl alcohol fiber (polyvinyl alcohol, ethylene-vinyl alcohol copolymer fiber, vinylon fiber) , Etc.), Synthetic fibers such as polyparaphenylene benzobisoxazole (PBO) fibers; natural fibers such as cellulose fibers and wool; inorganic fibers such as carbon fibers are widely used. These fibers may be single yarns used alone, or may be blended yarns in which two or more kinds are combined.

In order to increase the adhesive force between the compressed rubber layer 4, the stretched rubber layer 5, and the outer cover 7, the outer cloth 7 may be subjected to, for example, a “friction treatment” in which an unvulcanized rubber composition is attached to the cloth. The "friction treatment" uses a calendar roll and allows the unvulcanized rubber composition and the fabric to pass simultaneously between the rolls that rotate at different surface speeds, so that the unvulcanized rubber composition is even between the fibers of the fabric. It is a process of rubbing an object.

As shown in FIG. 1, the raised pieces 3 are joined to the outer peripheral surfaces of the wrapped V-belt 2 at predetermined intervals in the circumferential direction of the wrapped V-belt 2. The raised piece 3 extends in a direction protruding from the outer peripheral surface of the wrapped V-belt 2. The raised piece 3 projects diagonally from the outer peripheral surface of the wrapped V-belt 2. The side where the angle between the raised piece 3 and the wrapped V-belt 2 is an obtuse angle is the front side in the traveling direction, and the side where the angle between the raised piece 3 and the wrapped V-belt 2 is an acute angle is the rear side in the traveling direction. Is.

The raised piece 3 is formed of a low-hardness rubber layer and a high-hardness rubber layer having a higher hardness than the low-hardness rubber layer. For the high-hardness rubber layer, a rubber composition whose hardness (elastic modulus) has been increased by means such as increasing the amount of carbon black or adding short fibers is used. Therefore, the high hardness rubber layer is excellent in wear resistance. In the hardness defined by the JIS-A test method, the hardness of the low hardness rubber layer is 55 to 76 degrees, and the hardness of the high hardness rubber layer is 80 to 88 degrees.

As shown in FIG. 3, which is a side view of the raised piece 3, the low-hardness rubber layer 11 has a first low-hardness rubber layer 11a and a second low-hardness rubber layer 11b. The first low-hardness rubber layer 11a is arranged at a base portion which is a joint portion with the wrapped V-belt 2. The second low-hardness rubber layer 11b is arranged on the rear side of the raised piece 3 in the rotational direction of the wrapped V-belt 2 from the outer surface of the first low-hardness rubber layer 11a to the middle in the protruding direction of the raised piece 3.

The high-hardness rubber layer 12 has a first high-hardness rubber layer 12a and a second high-hardness rubber layer 12b. The first high-hardness rubber layer 12a is arranged on the front side of the raised piece 3 in the rotation direction of the wrapped V-belt 2 from the outer surface of the first low-hardness rubber layer 11a to the tip of the raised piece 3. The second high-hardness rubber layer 12b is arranged on the rear side of the raised piece 3 in the rotational direction of the wrapped V-belt 2 from the outer surface of the second low-hardness rubber layer 11b to the tip of the raised piece 3.

Assuming that the direction orthogonal to the circumferential direction and the width direction of the wrapped V-belt 2 is the height direction, the height T ₂ of the first low hardness rubber layer 11a is 2% or more and 10% or less of the height T ₁ of the raised piece 3. Has been made. Further, assuming that the protruding direction of the raised piece 3 is the length direction, the length L ₁ of the second low hardness rubber layer 11b is 40% or more and 60% or less of the length L ₀ of the raised piece 3. Further, assuming that the circumferential direction of the wrapped V-belt 2 is the width direction, the width W ₁ on the first low-hardness rubber layer 11a side of the second low-hardness rubber layer 11b is the same as the wrapped V-belt 2 in the first low-hardness rubber layer 11a. Is 30% or more and 50% or less of the width W ₀ on the opposite side. Further, the width W ₂ on the second high hardness rubber layer 12b side of the second low hardness rubber layer 11b is 20% or more and 40% of the width W ₀ on the side opposite to the wrapped V belt 2 in the first low hardness rubber layer 11a. It is as follows.

The wear resistance of the raised piece 3 can be improved by the first high hardness rubber layer 12a arranged on the front side of the raised piece 3 in the rotation direction of the wrapped V-belt 2. Further, due to the first high-hardness rubber layer 12a and the second high-hardness rubber layer 12b arranged behind the wrapped V-belt 2 in the raised piece 3 in the rotation direction, the entire tip portion of the raised piece 3 is made of high-hardness rubber. Since the layer 12 is formed, the time required for the tip portion of the raised piece 3 to be worn away due to wear and the transport capacity to be lowered is lengthened as compared with the configuration in which the high hardness rubber layer is arranged only on the front side of the tip portion. Can be done.

Further, the first low-hardness rubber layer 11a arranged at the base portion which is the joint portion with the wrapped V-belt 2 can secure the adhesiveness with the wrapped V-belt 2. Further, the repulsive force continuously received by the raised piece 3 can be relaxed by the second low hardness rubber layer 11b arranged on the rear side of the raised piece 3 in the rotation direction of the wrapped V-belt 2. Further, by setting the height T ₂ of the first low-hardness rubber layer 11a to 2% or more and 10% or less of the height T ₁ of the raised piece 3, the joint interface between the raised piece 3 and the wrapped V-belt 2 can be reached. Flexion fatigue can be alleviated.

As described above, the wear resistance and the bending resistance can be improved respectively. As a result, the damage phenomenon due to wear can be delayed, and the life can be extended (durability is improved). Therefore, in Japan, where the operating time for one season is relatively short, it can be used for multiple seasons. In China and Southeast Asia, where the operating time is relatively long (3 to 4 times that of Japan), it will be possible to use it maintenance-free for one season. In addition, since the place where the V-belt 1 with a mountain is attached is a deep part of the combine that is difficult to replace, delaying the replacement time (extending the maintenance-free period) can save the user the trouble of replacement.

(Manufacturing method of wrapped V-belt)
Next, a method of manufacturing the wrapped V-belt 2 will be described. As shown in FIG. 4, which is a chart showing the manufacturing process of the wrapped V-belt 2, the manufacturing process of the wrapped V-belt 2 includes an unvulcanized sleeve forming step S101, an unvulcanized rubber belt forming step S102, a skiving step S103, and a cover. The winding step S104 and the vulcanization step S105 are provided.

The unvulcanized sleeve forming step S101 is a step of forming the unvulcanized sleeve 101. As shown in FIG. 5, which is a perspective view of the unvulcanized sleeve 101, the unvulcanized sleeve 101 has a tubular shape and has an unvulcanized rubber layer and a core wire.

In the unvulcanized sleeve forming step S101, first, a sheet of unvulcanized rubber (that is, rubber in a state where vulcanization is not performed) is formed by rolling. Then, the unvulcanized rubber sheet formed by rolling is cut to a predetermined length and wound around a cylindrical or columnar rotating body. The unvulcanized rubber sheet wound around the outer circumference of the rotating body is formed into a tubular shape by joining the ends thereof. The unvulcanized rubber sheet formed into a tubular shape serves as a material for the compressed rubber layer 4 in the wrapped V-belt 2.

When a tubular unvulcanized rubber molded body is formed on the outer circumference of the rotating body, the core wire is then wound along the circumferential direction. The core wire is spirally wound along the circumferential direction while being displaced at a predetermined pitch along the width direction with respect to the tubular unvulcanized rubber molded body. The width direction of the tubular unvulcanized rubber molded body is configured as a direction parallel to the axial direction of the rotating body. The core wire is wound around a tubular unvulcanized rubber molded body over almost the entire length in the width direction.

When the winding of the core wire around the outer circumference of the tubular unvulcanized rubber molded body is completed, the unvulcanized rubber sheet formed by rolling is then wound from above the core wire. The unvulcanized rubber sheet wound from above the core wire is formed into a tubular shape by joining the ends thereof. A tubular unvulcanized rubber sheet wound around the outer peripheral side of the core wire serves as a material for the stretch rubber layer 5 in the wrapped V-belt 2. The unvulcanized sleeve 101 is formed by the unvulcanized sleeve forming step S101 described above. In addition, in FIG. 5, the unvulcanized sleeve 101 in the state of being removed from the rotating body is shown.

The unvulcanized rubber belt forming step S102 is a step of cutting the unvulcanized sleeve 101 in the circumferential direction to form an annular unvulcanized rubber belt 102. An overall view of the unvulcanized rubber belt 102 is shown in FIG. A perspective view of the unvulcanized rubber belt 102 is shown in FIG. Note that FIG. 7 shows a cross section perpendicular to the circumferential direction of the unvulcanized rubber belt 102 extending in an annular shape. In FIG. 7, the double-ended arrow A is the circumferential direction of the unvulcanized rubber belt 102, and the double-ended arrow B is the belt width direction orthogonal to the circumferential direction.

As shown in FIG. 7, the unvulcanized rubber belt 102 includes an inner peripheral side unvulcanized rubber layer 104, a core wire 106, and an outer peripheral side unvulcanized rubber layer 105. In the unvulcanized rubber belt 102, the core wire 106 is arranged between the inner peripheral side unvulcanized rubber layer 104 and the outer peripheral side unvulcanized rubber layer 105.

As the core wire 106, a twisted cord using a multifilament yarn (for example, various twists, single twist, rung twist, etc.) can be usually used. As the fibers constituting the core wire 106, synthetic fibers such as polyester fibers and aramid fibers, and inorganic fibers such as glass fibers and carbon fibers can be used. The surface of the core wire 106 may be subjected to a conventional adhesive treatment (or surface treatment).

The skiving step S103 skives by cutting both corner portions on the inner peripheral side of both side surfaces of the unvulcanized rubber belt 102 so as to scrape in the circumferential direction, and changes the cross-sectional shape of the unvulcanized rubber belt 102. It is a process. In the skiving step S103, both corner portions on the inner peripheral side of the unvulcanized rubber layer 104 on the inner peripheral side of the unvulcanized rubber belt 102 are cut so as to be scraped in the circumferential direction. As a result, the cross-sectional shape of the unvulcanized rubber belt 102, which was rectangular in the state before the treatment of the skive step S103, becomes a rectangular portion in the state after the treatment of the skive step S103. The shape is a combination of the trapezoidal part.

The cover winding step S104 is a step of covering the unvulcanized rubber belt 102, which has been processed in the skiving step S103, with the outer cover 7. In the cover winding step S104, the entire circumference of the annular unvulcanized rubber belt 102 is covered with the outer cover 7 over the entire length in the circumferential direction. As a result, an unvulcanized belt molded body formed by coating the unvulcanized rubber belt 102 with the outer cover 7 is formed.

The vulcanization step S105 is a step of heating the plastic unvulcanized rubber in the unvulcanized belt molded product to change it into elastic rubber. In the vulcanization step S105, for example, a cylindrical ring mold having an inverted trapezoidal cross-sectional groove provided on the outer periphery is used. The unvulcanized belt molded body is fitted into each of the plurality of grooves provided in the ring mold. Then, a cylindrical rubber sleeve is further fitted around the ring mold into which the plurality of unvulcanized belt molded bodies are fitted. In the vulcanization step S105, in a state where the cylindrical rubber sleeves are fitted on the outer peripheral surfaces of the ring mold and the unvulcanized belt molded body as described above, they are stored in the vulcanization can and at a predetermined temperature or the like. Vulcanization is performed under the conditions. After the vulcanization is completed, the ring mold and the like are disassembled, and the vulcanized molded body is taken out as the wrapped V-belt 2. By completing the vulcanization step S105 in this way, the wrapped V-belt 2 is manufactured.

(Manufacturing method of V-belt with mountain)
Next, a method of manufacturing the V-belt 1 with a mountain will be described. An unvulcanized rubber block for a raised piece is vulcanized and adhered to the outer peripheral surface of the wrapped V-belt 2 manufactured by the above manufacturing method.

The bonding method is as follows. Part or all of the outer cover 7 on the outer peripheral surface of the wrapped V-belt 2 that has been vulcanized is peeled off, and rubber glue is applied to the exposed stretched rubber layer 5. FIG. 8 shows an explanatory diagram of a process of stripping the outer cover 7 on the outer peripheral surface of the wrapped V-belt 2 all around.

At the same time, the unvulcanized rubber sheet for low hardness and the unvulcanized rubber sheet for high hardness are cut and combined to form an unvulcanized rubber block 103 that approximates the shape of the raised piece 3 after vulcanization. To do. In the present embodiment, as shown in FIG. 9, which is a side view of the unvulcanized rubber block 103, the unvulcanized rubber 111 for low hardness and the unvulcanized rubber 112 for high hardness are the first low-hardness rubber. The layers, the second low hardness rubber layer, the first high hardness rubber layer, and the second high hardness rubber layer are combined so as to form each.

FIG. 10 shows an example of the mold 201 used for vulcanization adhesion. The mold 201 is composed of a lower plate 202, a middle plate 203, and an upper plate 204. As shown in FIG. 11, which is a side view of the lower plate 202, the lower plate 202 has a protruding claw 202a that matches the inner peripheral length of the wrapped V-belt 2. As shown in FIG. 12, which is a front view of the middle plate 203, a predetermined number of holes 203a for fitting the unvulcanized rubber block 103 are formed in the middle plate 203. The shape of the hole 203a matches the size of the raised piece 3 after vulcanization.

When the preheating temperature of the mold 201 reaches the vulcanization temperature, the vulcanization operation is started. First, as shown in FIG. 11, the wrapped V-belt 2 is set on the claw 202a of the lower board 202. Next, the middle board 203 is superposed on the lower board 202. An unvulcanized rubber block 103 that resembles the shape of the raised piece 3 is fitted into the hole 203a hollowed out in the middle part 203 so as not to protrude from the hollowed out portion. Finally, the upper board 204 is superposed on the middle board 203. The mold 201, in which the lower plate 202, the middle plate 203, and the upper plate 204 are stacked, is sandwiched between upper and lower press plates containing a heat source, and vulcanization bonding is performed at a specified pressure and time. After vulcanization adhesion, the mountain V-belt 1 is removed from the middle plate 203.

(Evaluation)
Next, a bench evaluation was performed on the mountain-mounted V-belt 1 of the present embodiment. In this tabletop evaluation, as shown in FIG. 13, which is an explanatory diagram of the tabletop evaluation, the mountain V-belt 1 is rotated by two pulleys 302, and the obstacle 301 is continuously brought into contact with the raised piece 3. The conventional specification mountained V-belt (comparative example) and the mountainous V-belt 1 (example) of the present embodiment were evaluated on a tabletop, respectively, and the wear resistance of the raised piece 3 in the example was improved to make rice rice. It was confirmed whether the life of the function of raising the temperature was extended compared to the comparative example.

First, the outer cover 7 on the outer peripheral surface of the wrapped V-belt 2 that has been vulcanized is peeled off all around, rubber glue is applied to the exposed stretched rubber layer 5, and the unvulcanized rubber block 103 for the raised piece 3 is formed. Vulcanized and bonded. The unvulcanized rubber block 103 was formed by cutting an unvulcanized rubber sheet for low hardness and an unvulcanized rubber sheet for high hardness and combining them as shown in FIG.

Here, the unvulcanized rubber composition A was used as the material for the compressed rubber layer 4, the stretched rubber layer 5, and the low-hardness rubber layer 11 of the raised piece 3. The formulation of the unvulcanized rubber composition A is shown in Table 1. Further, the unvulcanized rubber composition B was used as the material of the high hardness rubber layer 12 of the raised piece 3. The formulation of the unvulcanized rubber composition B is shown in Table 2.

The core wire 6 is a twisted cord made of polyester fibers and has an average wire diameter of 0.89 mm. As the fabric that constitutes the outer cover cloth 7, three 20-count cotton spun yarns are twisted into the basic yarns of the warp and weft yarns, and woven with a plain weave with an intersection angle of 90 ° and a density of 75 yarns / 5 cm. However, the basis weight is 280 g / m ² . The cloth was friction-treated with the unvulcanized rubber composition C to obtain an outer cover cloth 7, and the entire peripheral surface of the wrapped V-belt 2 including the friction transmission surface was covered. The formulation of the unvulcanized rubber composition C is shown in Table 3.

Here, "PM-40" manufactured by DENKA Co., Ltd. was used as the chloroprene rubber. Further, as magnesium oxide, "Kyowa Mag 30" manufactured by Kyowa Chemical Industry Co., Ltd. was used. Moreover, as stearic acid, "stearic acid camellia" manufactured by NOF CORPORATION was used. Moreover, as an antiaging agent, "Nonflex OD-3" manufactured by Seiko Kagaku Co., Ltd. was used. Further, as carbon black, "Seast 3" manufactured by Tokai Carbon Co., Ltd. was used. Moreover, "RS-700" manufactured by ADEKA Corporation was used as a plasticizer. Further, as a vulcanization accelerator, "Noxeller TT" manufactured by Ouchi Shinko Chemical Industry Co., Ltd. was used. Moreover, as zinc oxide, "zinc oxide 3 kinds" manufactured by Shodo Chemical Industry Co., Ltd. was used. In addition, the core wire is a twisted cord of polyester fiber (average wire diameter 0.89 mm), and the fabric is a cotton woven fabric (plain weave, fineness is composed of 20-count warp and 20-count weft, and the yarn density of the warp and weft. 75 fibers / 50 mm and a grain of 280 g / m ² ) were used.

The dimensions of the wrapped V-belt 2 are shown in Table 4. Here, as shown in FIG. 14 which is a cross-sectional view of the wrapped V-belt 2, the width of the cross-sectional dimension is the width of the outer peripheral surface which is wider than the inner peripheral surface. The thickness of the cross-sectional dimension is the length in the direction orthogonal to the outer peripheral surface and the inner peripheral surface.

Table 5 shows the dimensions and hardness of the V-belt 1 with ridges after the unvulcanized rubber block 103 is vulcanized and bonded. Here, the number of peaks is the number of raised pieces 3. Further, as shown in FIG. 1, the mountain pitch is the distance a between the raised pieces 3, and the height of the mountain portion is the height b of the raised pieces 3. The width of the mountain portion (1) is the circumferential length c at the base of the raised piece 3, and the width of the mountain portion (2) is the circumferential length d at the tip of the raised piece 3. .. The angle of the mountain portion is an acute angle θ formed by the raised piece 3 and the wrapped V-belt 2.

Table 6 shows the evaluation conditions for bench evaluation. Here, the evaluation item is the side wear volume of the raised piece 3, not the amount of change in the length of the raised piece 3.

The results of the bench evaluation are shown in Table 7. In the example, the volume change amount of the example was 1/4 of that of the comparative example because the raised piece 3 was provided with the wear-resistant high-hardness rubber layer 12.

Further, the length L ₁ of the second low-hardness rubber layer 11b in the examples is made different from the range of 40% or more and 60% or less of the length L ₀ of the raised piece 3 and the outside of the range on the tabletop. Evaluation was performed. The results are shown in Table 8. Here, the comparative example in Table 8 is the same as the comparative example in Table 7.

Further, the width W ₁ of the second low-hardness rubber layer 11b on the side of the first low-hardness rubber layer 11a is 30% of the width W ₀ of the first low-hardness rubber layer 11a on the side opposite to the wrapped V-belt 2. The bench evaluation was performed by differentiating between the range of 50% or less and the range outside the range. The results are shown in Table 9. Here, the comparative example in Table 9 is the same as the comparative example in Table 7.

Further, the width W ₂ of the second low hardness rubber layer 11b on the second high hardness rubber layer 12b side is 20% of the width W ₀ of the first low hardness rubber layer 11a on the side opposite to the wrapped V-belt 2. The bench evaluation was performed with different values within the range of 40% or less and outside the range. The results are shown in Table 10. Here, the comparative example in Table 10 is the same as the comparative example in Table 7.

From the results in Tables 8 to 10, it is found that the amount of wear (volume change) is smaller when the values of length L ₁ , width W ₁ , and width W ₂ are within the range than those outside the range. all right. Therefore, it was found that when the size of the second low-hardness rubber layer 11b is within the above range, the cushioning effect of relaxing the repulsive force continuously received by the raised piece 3 is enhanced.

In this bench evaluation, the amount of change in length of the raised piece 3 judged to have reached the end of its life was not reproduced in the actual machine, but the amount of change in length was sufficient from the result of the amount of change in side wear of the raised piece 3. Can be judged to have an advantage.

(Actual machine evaluation)
Next, in the Southeast Asian market, where the operating time is longer than in Japan, we evaluated using actual machines. The evaluation was carried out by alternately attaching two mountainous V-belts of the comparative example and two mountainous V-belts 1 of the example to the four-row cutting combine. Then, the time until the raised piece 3 was worn out and shortened, and the function of causing rice was not satisfied and the life was reached was measured. The evaluation conditions are shown in Table 11.

The evaluation results are shown in Table 12. The mountain V-belt of the comparative example was replaced because it reached the end of its life at 438 hr and 372 hr in the middle of the season, but the mountain V-belt 1 of the example continued to satisfy the function of causing rice until the end of the season. Therefore, the life of the function that causes rice in the examples is three times or more that of the comparative example.

Further, the height T ₂ of the first low-hardness rubber layer 11a is within the range of 2% or more and 10% or less of the height T ₁ of the raised piece 3 (Example) and outside the range (Comparative Examples 1 and 2). The actual machine was evaluated differently from the above. The results are shown in Table 13. Here, the comparative example in Table 13 is the same as the comparative example in Table 12.

Comparative Examples 1 and 2 had a lifespan in the middle of the season, but the examples continued to satisfy the function of causing rice until the end of the season, and the lifespan was more than three times that of the comparative examples. Therefore, by setting the height T ₂ of the first low-hardness rubber layer 11a within the range of 2% or more and 10% or less of the height T ₁ of the raised piece 3, the raised piece 3 and the wrapped V-belt 2 are joined. It was found that the life of the rice-causing function was extended as a result of alleviating bending fatigue at the interface.

(effect)
As described above, according to the V-belt 1 with a mountain according to the present embodiment, the raised piece 3 is formed by the low hardness rubber layer 11 and the high hardness rubber layer 12 having a hardness higher than that of the low hardness rubber layer 11. To do. The wear resistance of the raised piece 3 can be improved by the first high hardness rubber layer 12a arranged on the front side of the raised piece 3 in the rotation direction of the wrapped V-belt 2. Further, due to the first high-hardness rubber layer 12a and the second high-hardness rubber layer 12b arranged behind the wrapped V-belt 2 in the raised piece 3 in the rotation direction, the entire tip portion of the raised piece 3 is made of high-hardness rubber. Since the layer 12 is formed, the time required for the tip portion of the raised piece 3 to be worn away due to wear and the transport capacity to be lowered is lengthened as compared with the configuration in which the high hardness rubber layer is arranged only on the front side of the tip portion. Can be done. Further, the first low-hardness rubber layer 11a arranged at the base portion which is the joint portion with the wrapped V-belt 2 can secure the adhesiveness with the wrapped V-belt 2. Further, the repulsive force continuously received by the raised piece 3 can be relaxed by the second low hardness rubber layer 11b arranged on the rear side of the raised piece 3 in the rotation direction of the wrapped V-belt 2. Further, by setting the height of the first low hardness rubber layer 11a to 2% or more and 10% or less of the height of the raised piece 3, bending fatigue at the joint interface between the raised piece 3 and the wrapped V-belt 2 is alleviated. can do. Thereby, wear resistance and bending resistance can be improved respectively.

Further, by setting the length of the second low-hardness rubber layer 11b to 40% or more and 60% or less of the length of the raised piece 3, the repulsive force continuously received by the raised piece 3 can be suitably relaxed. ..

Further, the width of the second low-hardness rubber layer 11b on the side of the first low-hardness rubber layer 11a is set to 30% or more and 50% or less of the width of the first low-hardness rubber layer 11a on the side opposite to the wrapped V-belt 2. 2 The width of the low-hardness rubber layer 11b on the second high-hardness rubber layer 12b side is set to 20% or more and 40% or less of the width of the first low-hardness rubber layer 11a on the side opposite to the wrapped V-belt 2. The repulsive force continuously received by the piece 3 can be suitably relaxed.

Further, in the hardness defined by the JIS-A test method, by setting the hardness of the low hardness rubber layer 11 to 55 to 76 degrees and the hardness of the high hardness rubber layer 12 to 80 to 88 degrees, the wear resistance of the raised piece 3 is increased. It is possible to suitably alleviate bending fatigue at the joint interface between the raised piece 3 and the wrapped V-belt 2 while suitably improving the properties.

Although the embodiments of the present invention have been described above, only specific examples are illustrated, and the present invention is not particularly limited, and specific configurations and the like can be appropriately redesigned. In addition, the actions and effects described in the embodiments of the present invention merely list the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what has been done.

1 V-belt with mountain 2 Wrapped V-belt 3 Raised piece 4 Compressed rubber layer 5 Stretched rubber layer 6 Core wire 7 Outer cloth 11 Low hardness rubber layer 11a 1st low hardness rubber layer 11b 2nd low hardness rubber layer 12 High hardness rubber layer 12a 1st high hardness rubber layer 12b 2nd high hardness rubber layer 101 Unvulcanized sleeve 102 Unvulcanized rubber belt 103 Unvulcanized rubber block 104 Inner peripheral side unvulcanized rubber layer 105 Outer peripheral side unvulcanized rubber layer 106 Core wire 111 Unvulcanized rubber for low hardness 112 Unvulcanized rubber for high hardness 201 Mold 202 Lower plate 202a Claw 203 Middle plate 203a Hole 204 Upper plate 301 Obstacle 302 Pulley

Claims (4)

In a V-belt with a mountain that is used for agricultural machinery and scoops and transports crops
The belt body, which is endless and rotates in the circumferential direction,
A ridge piece that is joined to the outer peripheral surface of the belt body at predetermined intervals in the circumferential direction of the belt body and extends in a direction protruding from the outer peripheral surface.
Have,
The raised piece is formed of a low-hardness rubber layer and a high-hardness rubber layer having a hardness higher than that of the low-hardness rubber layer.
The low-hardness rubber layer includes a first low-hardness rubber layer arranged at a base portion which is a joint with the belt body, and the first low-hardness rubber layer on the rear side of the raised piece in the rotation direction of the belt body. It has a second low-hardness rubber layer arranged from the outer surface of the rubber layer to the middle of the protruding direction of the raised piece.
The high-hardness rubber layer includes a first high-hardness rubber layer arranged from the outer surface of the first low-hardness rubber layer to the tip of the raised piece on the front side of the raised piece in the rotation direction of the belt body, and the raised piece. A second high-hardness rubber layer arranged from the outer surface of the second low-hardness rubber layer to the tip of the raised piece is provided on the rear side of the piece in the rotation direction of the belt body.
Assuming that the direction orthogonal to the circumferential direction and the width direction of the belt body is the height direction, the height of the first low hardness rubber layer shall be 2% or more and 10% or less of the height of the raised piece. V-belt with a mountain that features. Claim 1 is characterized in that the length of the second low-hardness rubber layer is 40% or more and 60% or less of the length of the raised piece, where the protruding direction of the raised piece is the length direction. V-belt with mountain described in. When the circumferential direction of the belt body is the width direction, the width of the second low-hardness rubber layer on the side of the first low-hardness rubber layer is the width of the first low-hardness rubber layer on the side opposite to the belt body. It is set to 30% or more and 50% or less,
The width of the second low-hardness rubber layer on the side of the second high-hardness rubber layer is 20% or more and 40% or less of the width of the first low-hardness rubber layer on the side opposite to the belt body. The V-belt with a mountain according to claim 1 or 2. The hardness defined by the JIS-A test method is characterized in that the hardness of the low hardness rubber layer is 55 to 76 degrees and the hardness of the high hardness rubber layer is 80 to 88 degrees. The V-belt with a mountain according to any one of 3.

Images