JP2010133551A - High load transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high load transmission belt performing more efficient transmission with inhibiting the centrifugal force from excessively increasing even if the belt is used at a high rotation with reducing block weight and having few problems such as wear of a block in the formation of high temperature environment while having sufficient intensity. <P>SOLUTION: In the high load transmission belt 1 including a plurality of blocks 6 provided in the predetermined pitch along the longitudinal direction of center belts 4, 5, the block 6 is made of a carbon fiber reinforced resin formed by laminating prepregs made by impregnating carbon fibers arranged in one direction or a carbon fiber fabric with a resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a high-load transmission belt in which blocks are fixed at a predetermined pitch along the longitudinal direction of a center belt.

  The belt used in the belt continuously variable transmission is used by wrapping around a transmission pulley that changes the effective diameter of the pulley by adjusting the V groove width of the pulley and adjusts the transmission ratio. Since the side pressure of the belt increases, the belt must withstand a large side pressure. In addition to continuously variable speed applications, it is necessary to use a belt that can withstand a high load, especially for high-load transmission applications where the life of conventional rubber belts is too short.

  Among such belts, there is a tensile transmission type high-load transmission belt in which a block is fixed to the center belt to increase the strength in the belt width direction. There is a type in which a block made of a resin that is relatively harder than the elastomer used for the center belt is fixed to the center belt embedded in the elastomer using a fastening material such as a bolt or a rivet.

  As described above, the required quality of such a tension transmission type high load transmission belt block is the purpose of high load transmission in friction transmission, so bending fatigue, wear resistance, heat resistance, rigidity, It is necessary to possess properties such as impact properties in a well-balanced manner. Furthermore, it is an important factor not to wear the pulley.

  An example of a high load transmission belt that satisfies these requirements is disclosed in Patent Document 1. This belt uses a double-structured block in which the part where the block and pulley are in contact with each other is made of a resin molding material in which a rubber component is added to a phenolic resin component and an insert material formed of metal or the like. It is.

  Patent Document 2 discloses a high-load transmission belt in which a carbon fiber is blended with a thermoplastic resin such as polyamide and a block in which a metal insert material is not embedded is also laid.

  Further, although not related to a belt, Patent Document 3 discloses a technique related to a molded body in which a thermoplastic resin is used as an insert material and the surface is coated with a thermosetting resin. Patent Document 4 discloses a belt in which a plurality of layers of plate-shaped reinforcing members are embedded in a block, and Patent Document 5 discloses a block in which a canvas impregnated with a phenol resin is laminated or spirally wound. It is disclosed to use.

Japanese Patent Laid-Open No. 63-34342 JP 2001-31453 A JP-A-5-318527 Japanese Utility Model Publication 2-37309 Japanese Utility Model Publication No.59-136055

  When the belt has a metal insert material such as aluminum embedded in the resin as disclosed in Patent Document 1, the weight of the block is inevitably increased due to the insert material. The centrifugal tension of inevitably becomes large. Then, on the side of the drive device that runs the belt, it is necessary to increase the axial load and the pulley composition, so that the drive device as a whole tends to be large and expensive. There is a disadvantage that it is difficult to downsize. There is also a disadvantage that it is not suitable for high-speed rotation.

  In the belt as disclosed in Patent Document 2, the block is made of a resin such as polyamide, and the insert material is not embedded, so the weight of the block is relatively light, and the centrifugal tension during belt running Therefore, the shaft load and pulley rigidity required for the belt drive device that drives the belt may be moderate, and it is suitable for high-speed rotation in addition to being able to reduce costs. For example, it can be applied to an engine having a small displacement and a high rotational speed.

  However, for example, in a thermoplastic resin such as polyamide, the melting point is low and the glass transition point is low, so if the temperature becomes high due to friction with the pulley, if the temperature becomes high due to friction with the pulley, the block becomes molten and wears out. There's a problem.

  Patent Document 3 discloses a technique for coating a thermoplastic resin with a thermosetting resin, but does not relate to a belt using a block as in the present invention. In addition, the thermoplastic resin is weak in terms of flexural modulus and strength, and is inferior in adhesiveness with the thermosetting resin, so that there is a problem that it is difficult to provide sufficient strength as a block.

  The reinforcement member embedded in the block disclosed in Patent Document 4 is made of a high elastic modulus material such as metal or plastic, and the weight of those using a plurality of plate-like reinforcement members is increased. The problem cannot be avoided.

  The block of Patent Document 5 is a belt of a type in which the block is fixed to the center belt by using a rivet, and since the surface of the block is not provided with a separate coating material, There was a problem that transmission was not performed smoothly and transmission efficiency was lowered, and the wear resistance of the block was poor.

  The present invention has been made in view of the above-described problems. Even when the block weight is reduced and the high-speed rotation is used, the generated centrifugal force is not excessively large, and has sufficient strength and a high temperature environment. It is an object of the present invention to provide a high-load transmission belt that is less susceptible to block wear and the like and can perform more efficient transmission.

  In order to achieve the above object, in the invention of claim 1 of the present invention, in a high load transmission belt comprising a center belt and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, The block is made of carbon fiber reinforced plastic in which carbon fibers are arranged in one direction or carbon fiber woven fabric is laminated with a prepreg impregnated with resin.

  In the invention which concerns on Claim 2, it is set as the high load power transmission belt of Claim 2 which resin to impregnate consists of an epoxy resin or a phenol resin.

  According to a third aspect of the present invention, the carbon fiber is a high load transmission belt according to the first or second aspect, wherein the pitch fiber is used.

  According to a fourth aspect of the present invention, the carbon fiber in the carbon fiber reinforced plastic constituting the block is a high load transmission belt according to any one of the first to third aspects, which is oriented in the belt width direction.

  According to a fifth aspect of the present invention, in the side surface of the block, the high load transmission belt according to the fourth aspect has a portion in which carbon fibers are oriented in the belt longitudinal direction.

  According to a sixth aspect of the present invention, there is provided the high load transmission belt according to the fifth aspect, wherein a prepreg obtained by impregnating a carbon fiber with a resin is wound into a rectangular shape and cut into a block shape.

  In the invention according to claim 7, the center belt is formed with block holding portions at a predetermined pitch on both upper and lower surfaces, and the blocks are sandwiched and arranged between the block holding portions. High load transmission belt.

  In the invention according to claim 8, the block is composed of a center pillar that connects the upper beam, the lower beam, and the upper and lower beams at the center, and is surrounded by the upper and lower beams and the center pillar and opens to the left and right sides of the block. 8. The high load transmission belt according to claim 7, further comprising a mounting portion, wherein a block is sandwiched between the center belt block holding portions by mounting a pair of center belts to the belt mounting portion.

  According to an eighth aspect of the present invention, the height of the block holding portion is 40 to 100% of the height of the upper and lower beams.

  According to the first aspect, the block is made of a material obtained by laminating a prepreg obtained by impregnating a long fiber of carbon fiber with a resin, and it is lightweight but has high strength and high rigidity, and centrifugal force generated during belt running. The belt can withstand a large lateral pressure from the pulley and can transmit a high torque. This is particularly advantageous for applications that are used at high speeds.

  In claim 2, an epoxy resin or a phenol resin is used as the resin impregnated into the carbon fiber, and a block having higher heat resistance and strength can be obtained.

  According to the third aspect, pitch-based carbon fibers are used, and the tensile elastic modulus is larger than that of the PAN-based carbon fibers, so that the problem of peeling of the carbon fibers from the block can be reduced.

  According to the fourth aspect of the present invention, the carbon fibers of the carbon fiber reinforced plastic are arranged so as to be oriented in the belt width direction, and the strength in the width direction of the block can be increased. Therefore, even when high torque is transmitted, the belt Can be provided with sufficient lateral pressure resistance.

  According to the fifth aspect of the invention, the carbon fibers are oriented in the longitudinal direction of the belt on the side surface of the block, and even if the friction between the block and the pulley during running of the belt, the carbon fiber is not easily peeled off and the block is damaged over a long period of time. It is possible to provide a belt without problems.

  In Claim 6, the prepreg obtained by impregnating carbon fiber with a resin is wound into a rectangular shape, and the carbon fiber is arranged in the circumferential direction of the block, and the end of the carbon fiber that becomes the starting point of peeling of the carbon fiber Since the portion does not appear on the surface of the block, particularly on the side surface of the block that contacts the pulley, the problem of carbon fiber peeling can be solved.

  In Claim 7, it is set as the structure which pinched and arrange | positioned the block between the block holding parts formed in the surface of a center belt, and it is not necessary to process the shape which fits a center belt on the block side, and is low-cost. The block and the center belt can be securely fixed.

  In the eighth aspect, the shape of the block is more specifically limited. As in the third aspect, there is no need to process the block, and the block and the center belt can be securely fixed.

  In the eighth aspect, the ratio of the block holding portion height to the block height is limited, and the range is set so that the block holding portion is sufficiently and reliably held by the block holding portion.

  FIG. 1 is a perspective view showing an example of a high load transmission belt 1 according to the present invention, and FIG. 2 is a side sectional view thereof. A high load transmission belt 1 of the present invention is formed along a longitudinal direction of a pair of center belts 4 and 5 having the same width formed by embedding a rope-shaped core body 3 in an elastomer 2 in a spiral shape. And a block 6 which is locked and fixed at a predetermined pitch.

  Both side surfaces 7 and 8 of the block 6 are inclined surfaces that engage with the V-grooves of the pulleys, receive torque from the driven pulleys, and pass to the driven pulleys via the center belts 4 and 5. It transmits power.

  The block 6 used in the high-load transmission belt 1 of the present invention includes an upper beam 9 and a lower beam 10 and a pillar 11 that connects the upper and lower beams 9 and 10 at the center. Grooves 12 and 13 for fitting the center belts 4 and 5 are formed. Further, on the upper surface 14 and the lower surface 15 of the grooves 12 and 13, there are provided a protruding strip portion 18 that fits into a concave strip portion 16 provided on the upper surface of the center belt 3 and a concave strip portion 17 provided on the lower surface.

  The front and rear surfaces below the center of the block in the vertical direction are inclined so that the blocks can be bent without contacting each other when the belt is wound around the pulley.

  The material is made of carbon fiber reinforced plastic with carbon fiber laid in one direction or carbon fiber woven fabric with multiple prepregs impregnated with resin, and has low strength and high strength and high rigidity. Have. Therefore, the block 6 using such a material can transmit a high load without being greatly deformed even if it receives a large lateral pressure from the pulley.

  Further, even when the center belts 4 and 5 are fitted and mounted in the grooves 12 and 13 on the side surfaces of the block, the upper beam 9 and the lower beam 10 are not easily bent, and the block 6 and the center belts 4 and 5 are loosely fitted. Can be prevented from occurring.

  The arrangement of the carbon fibers C in the block 6 is as follows. In claim 4, a block oriented in the width direction of the belt is used, and a laminate 20 of prepregs in which carbon fibers are arranged in one direction as shown in FIG. The block can be obtained by curing and cutting out the shape of the block by cutting. By arranging all the carbon fibers C so as to be oriented in the width direction of the belt, the compressive strength in the width direction of the block 6 can be increased, and a belt that can sufficiently withstand a large lateral pressure from the pulley can be obtained. .

  However, since the end portions of the carbon fibers are located on the side surfaces 7 and 8 of the block 6, the carbon fibers are peeled off due to friction with the pulleys, and the failure of the block 6 leads to the failure of the belt. Sometimes.

  On the other hand, in claim 5, the carbon fiber is basically oriented in the width direction of the belt in most parts of the block 6 so as to enhance the lateral pressure resistance of the belt. The carbon fiber is oriented in the belt longitudinal direction only at 8, and the problem that the carbon fiber peels from the block even if the side surfaces 7 and 8 of the block 6 rub against the pulley while the belt is running is suppressed. Can do.

  As a specific form in which the carbon fibers are oriented in the longitudinal direction of the belt as described above on the side surfaces 7 and 8 of the block 6, the form as recited in claim 6 can be exemplified. According to the sixth aspect of the present invention, a prepreg obtained by impregnating carbon fiber with a resin to be in a semi-cured state is wound into a rectangular shape in accordance with the shape of the block 6 viewed from above and cured to form a rectangular parallelepiped shape. Thus, by cutting, the side surface of the block is inclined at an angle to be engaged with the V groove of the pulley, and the grooves 12 and 13 for fitting the center belts 4 and 5 are formed. 5 is formed, and a slope is also formed on the front and rear surfaces of the lower part from the center in the vertical direction of the block. Although it is the method of actually winding a prepreg and making it a rectangular parallelepiped shape, as shown in FIG. 4, it is set as a rectangular parallelepiped prepreg roll 31 by first winding it in the shape of a cylinder 30 and then molding it so that the cross section becomes rectangular. Then, the block 6 can be obtained by curing and cutting into the shape of the block 6.

  In this way, by arranging the carbon fibers C in a rectangular shape in accordance with the shape of the block, the end of the carbon fiber C is not arranged on the side surface of the block, and the bell stain is placed in the middle in the width direction of the block. The carbon fibers C oriented in the width direction can be arranged, and the carbon fibers C oriented in the longitudinal direction of the belt can be arranged on the side surface of the block, so that the side pressure resistance of the belt can be sufficiently secured. Moreover, the problem that the carbon fiber C from the side surface of the block peels can be prevented.

  Further, the block is formed by winding the prepreg according to claim 6. However, as shown in FIG. 5, the prepreg is wound in a conical 40 shape at an angle in accordance with the side of the block, and the block is rectangular in cross section. Is formed into a quadrangular pyramid 41 shape, and grooves 12 and 13 for fitting the center belts 4 and 5 are formed by cutting or the like, and the upper and lower surfaces of the grooves engage with the center belts 4 and 5 A portion is formed, and an inclination is also formed on the front and rear surfaces of the lower portion of the block in the vertical direction. In the block 6 obtained by such a method, the carbon fiber C can be increased in thickness on the side surface 7 of the lower beam 10 of the block. The peeling of the fiber C can be suppressed.

  6 is a perspective view showing an example of a high load transmission belt 1 according to the present invention, FIG. 7 is a perspective view of a block, FIG. 8 is a side sectional view of the belt shown in FIG. 6, and FIG. It is a sectional side view which shows an example. In the high load transmission belt 1 according to claims 7 to 8 of the present invention, the center belts 4 and 5 and the block 6 are locked, and the upper and lower surfaces 14 and 15 of the center belts 4 and 5 are held at a predetermined pitch. Parts 19 and 20 are formed, and the block 6 is locked and fixed to the center belts 4 and 5 in the belt longitudinal direction by sandwiching the block 6 between the adjacent block holding parts 19 and 20. Has been. Since a material obtained by laminating a prepreg obtained by solidifying carbon fiber long fibers with a resin is used, the block 6 is usually formed by punching, and it is technically difficult to process a complicated shape. There is a problem that the cost is high. However, by locking and fixing the block 6 and the center belts 4 and 5 with the structure as described above, there is an advantage that the block 6 can be used in a punched shape.

  Although it is disadvantageous in terms of cost, a groove in the belt width direction is provided in the grooves 12 and 13 into which the center belt of the block 6 is fitted, and a groove that meshes with the protrusion on the side of the center belts 4 and 5. A method may be adopted in which the block 6 and the center belts 4 and 5 are locked and fixed by providing a portion and engaging the both. Although it is disadvantageous in cost in processing of the block 6, it is light weight, high rigidity and high strength by using a material obtained by laminating a prepreg obtained by solidifying carbon fibers with a resin as a material of the block 6. Since the advantage that it exists can be enjoyed, a belt having high transmission performance and a long life can be obtained as a high load transmission belt.

  The block 6 used in the high load transmission belt of the present invention is a carbon fiber reinforced plastic in which a plurality of prepregs in which carbon fibers are arranged in one direction or carbon fiber woven fabric is impregnated with a resin are laminated. In some cases, short fibers of carbon fibers are mixed with resin for reinforcement and injection molded. In such a case, the carbon fibers are fibers of about several tens of micrometers. The carbon fiber in the present invention is not such a short fiber, but, depending on the size of the molded product, for example, it is 1 mm to several tens of mm or longer, and the long fiber having the same length as the product is contained in the molded product. This is what you do. Specifically, for example, fibers prepared in one direction can be prepared and impregnated with a resin, or fibers woven into a fiber can be used. In addition, it is preferable to use a carbon fiber having a pitch system (tensile elastic modulus: about 900 GPa) rather than a PAN system (tensile elastic modulus: about 230 GPa) because the tensile elastic modulus is higher and the carbon fiber is less likely to be peeled off from the block. .

  Moreover, as a resin to be used, a thermosetting resin and a thermoplastic resin can also be used. Examples of the thermosetting resin include phenol resin, epoxy resin, unsaturated polyester resin, diallyl phthalate resin, and melamine resin. Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, and acrylic resin. Usually, it is preferable to use a phenol resin or an epoxy resin from the viewpoints of heat resistance, strength, wear resistance, and the like.

  As a molding method, a prepreg in a state where fibers are spread on a mold and impregnated with a resin mixed with a curing agent is preliminarily heated and semi-cured. The plate state is formed by a method of laminating the prepreg to a required thickness and baking and hardening, and then the block 6 can be formed by punching into a block shape.

  Examples of the elastomer used for the center belts 4 and 5 include a single material such as chloroprene rubber, natural rubber, nitrile rubber, styrene-butadiene rubber, hydrogenated nitrile rubber, or a rubber or polyurethane rubber obtained by appropriately blending them. It is done. As the core 5, a rope selected from polyester fiber, polyamide fiber, aramid fiber, glass fiber, steel wire and the like is used. Moreover, you may provide a cover canvas in the upper and lower surfaces of a belt. Examples of the material for the cover canvas include polyester fiber, polyamide fiber, and aramid fiber.

  The upper and lower surfaces of the center belts 4 and 5 are formed with block holding portions 19 and 20 for holding and fixing the upper beam 9 and the lower beam 10 of the block 6 as will be described with reference to FIG. Further, the heights a and b of the block holding portions 19 and 20 are preferably set within a range of 40 to 100% of the heights c and d of the upper and lower beams 9 and 10 of the block 6, respectively. If it is less than 40%, the holding of the block 6 is insufficient, the movement of the block 6 with respect to the center belts 4 and 5 becomes large, the power transmission efficiency is lowered, or the block holding parts 19 and 20 are sometimes damaged. There is a problem that the block 6 comes off the belt, which is not preferable. If it exceeds 100%, adjacent belt holding portions interfere with each other when the belt is bent, or the belt holding portions 19 and 20 are fatigued by being pinched by the block 6 and cracks are not preferable.

  In addition, the thickness e of the block holding portions 19 and 20 is preferably in the range of 30 to 100% of the thickness f of the block 6. If it is less than 30%, the interval between the blocks 6 becomes too narrow, and when the belt bends, the front and back blocks interfere with each other to prevent bending, which is not preferable. If it exceeds 100%, the number of blocks 6 that can be attached to the entire circumference of the belt becomes too small, which adversely affects the durability of the belt, such as a reduction in side pressure resistance.

  It is preferable to set the interval between adjacent block holding portions 19 and 20 in a state where the block 6 is not mounted within a range of 60 to 95% of the thickness f of the block 6. If it exceeds 95%, the holding of the block 6 is not sufficient, the movement of the block 6 with respect to the center belts 4 and 5 is also increased, the power transmission efficiency is lowered, and in some cases, the block holding portions 19, 20 Is not preferable because there is a problem that the block 6 is detached from the belt. If it is less than 60%, it becomes difficult to mount the block 6, and even when the block is mounted, the compression of the block holding portions 14 and 15 by the block 6 becomes too large, and the physical properties are deteriorated due to the deformation of the block holding portions 19 and 20. Since it becomes large, it is not preferable.

  Next, a belt as an example of the present invention and a belt of a comparative example not included in the present invention are prepared, and each belt is run under the same conditions to measure the time until a failure occurs, and the failure phenomenon. It was confirmed.

Example 1
As the belt of Example 1, a center belt in which a core wire made of an aramid fiber is embedded in a belt body made of hydrogenated nitrile rubber is used, and on the surface, the aramid fiber is a weft in the longitudinal direction of the belt, and the warp is a polyamide fiber. The one covered with a cover canvas was used. As a block, a prepreg impregnated with a PAN-based carbon fiber and a phenol resin is laminated and cured with the carbon fiber arranged in one direction, and the block is cut by cutting so that the carbon fiber is in the width direction of the belt. What was made into the shape of was used.

  Using this belt, the time until a failure occurred while running under the running conditions shown in Table 1 was measured, and the failure phenomenon was observed. The results are shown in Table 2.

(Example 2)
In Example 2, a prepreg obtained by impregnating a pitch-based carbon fiber with a phenol resin as a block is laminated and cured with the carbon fiber arranged in one direction so that the carbon fiber is in the width direction of the belt. A belt exactly the same as in Example 1 was used, except that a block shape was used in the cutting process.

  Using this belt, the time until a failure occurred while running under the running conditions shown in Table 1 was measured, and the failure phenomenon was observed. The results are shown in Table 2.

(Example 3)
In Example 3, a prepreg impregnated with a phenolic resin in a PAN-based carbon fiber as a block was wound into a cylindrical shape, and then shaped into a rectangular parallelepiped shape according to the size of the block, cured, cured, and cut The belt was formed in the same shape as in Example 1 except that a block shape was formed by processing, and a block in which carbon fibers were arranged around the block shape was used.

  Using this belt, the time until a failure occurred while running under the running conditions shown in Table 1 was measured, and the failure phenomenon was observed. The results are shown in Table 2.

Example 4
In Example 4, a prepreg impregnated with a phenolic resin in a PAN-based carbon fiber was wound as a block into a conical shape with an angle according to the side of the block, and then shaped into a rectangular cross section according to the size of the block. The belt was made exactly the same as in Example 1 except that a block was formed by curing, cutting into a block shape, and using a block in which carbon fibers were arranged in a circular shape in accordance with the block shape.

  Using this belt, the time until a failure occurred while running under the running conditions shown in Table 1 was measured, and the failure phenomenon was observed. The results are shown in Table 2.

(Comparative example)
As the belt of the comparative example, a center belt made of hydrogenated nitrile rubber and embedded with a core made of aramid fiber is used as in the example, the aramid fiber is used as the weft in the longitudinal direction of the belt on the surface, and the warp is made of polyamide fiber. What covered the cover canvas was used. The block was composed of a single resin composition, and the resin composition was blended with 30% by mass of short carbon fibers and 10% by mass of potassium titanate whisker with respect to the phenol resin.

  Using this belt, the time until a failure occurred while running under the running conditions shown in Table 1 was measured and the failure phenomenon was observed. The results are shown in Table 2.

  As can be seen from the results in Table 2, the belt of Example 1 can run for a long time compared to the comparative example, and the use of carbon fiber reinforced plastic as the block prevents block wear and improves side pressure resistance. The effect of was recognized. In Example 2, although it is censored at 20,000 km, the life is further extended as compared with Example 1, and the use of pitch-based carbon fiber can suppress block peeling. all right.

  Also in Example 3, the lifetime was longer than that in Example 1, and it was found that the problem of carbon fiber peeling could be suppressed by arranging the carbon fibers on the side surface of the block in the longitudinal direction of the belt. Further, in Example 4, the thickness of the layer in which the orientation of the carbon fiber of the lower beam was set in the longitudinal direction of the belt was increased as compared with Example 3, but it was cut off at 20,000 km. It was possible to prevent the fibers from being peeled off, resulting in a longer life.

  The present invention can be applied to the manufacture of belts that change the effective diameter of pulleys and transmit large torque, such as continuously variable transmissions for automobiles, motorcycles, and agricultural machines.

It is a perspective view of a high load power transmission belt. It is a sectional side view of a high load power transmission belt. It is a schematic diagram which shows the preparation process of the block which orientated carbon fiber in the width direction. It is a schematic diagram which shows the creation process of the block which winds and produces carbon fiber. It is a schematic diagram which shows the creation process of the block which winds and produces carbon fiber at an angle. It is a perspective view which shows an example of a high load power transmission belt. It is a perspective view of a block. It is a sectional side view of the high load power transmission belt shown in FIG. It is side sectional drawing which shows another example of a high load power transmission belt.

DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Elastomer 3 Core wire 4 Center belt 5 Center belt 6 Block 7 Block side surface 8 Block side surface 9 Upper beam 10 Lower beam 11 Pillar 12 Groove 13 Groove 14 Upper surface 15 Lower surface 16 Concave portion 17 Convex portion 18 Convex Strip 19 Block holder 20 Block holder

Claims (9)

  In a high-load transmission belt comprising a center belt and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, the blocks are made of carbon fibers arranged in one direction or a carbon fiber woven cloth resin A high-load power transmission belt comprising a carbon fiber reinforced plastic laminated with a prepreg impregnated with.   The high load transmission belt according to claim 2, wherein the resin to be impregnated comprises an epoxy resin or a phenol resin.   The high load transmission belt according to claim 1 or 2, wherein the carbon fiber is pitch-based.   The high load power transmission belt according to any one of claims 1 to 3, wherein carbon fibers in the carbon fiber reinforced plastic constituting the block are oriented in the belt width direction.   The high load transmission belt according to claim 4, wherein the side surface of the block has a portion in which carbon fibers are oriented in the belt longitudinal direction.   The high-load transmission belt according to claim 5, wherein a prepreg obtained by impregnating carbon fiber with a resin is wound into a rectangular shape, and is cut into a block shape.   The high load transmission belt according to any one of claims 1 to 6, wherein the center belt is formed with block holding portions on both upper and lower surfaces at a predetermined pitch, and the blocks are sandwiched between the block holding portions.   The block includes a center pillar that connects the upper beam, the lower beam, and the upper and lower beams at the center, and has a pair of belt mounting portions that are surrounded by the upper and lower beams and the center pillar and open to both left and right sides of the block. 8. The high load transmission belt according to claim 7, wherein a block is sandwiched and disposed between block holding portions of the center belt by mounting the center belt on the belt mounting portion.   The high load transmission belt according to claim 8, wherein the height of the block holding portion is 40 to 100% of the height of the upper and lower beams.

Images