JP2004245404A - High load transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high load transmission belt using a first block in which an insert member for improving resistance to side pressure is buried and a second light-weight block in which the insert member is not buried together at a predetermined ratio, capable of reducing noise when belt running and weight of the belt, and having resistance to side pressure to endure certain degree of load. <P>SOLUTION: This high load transmission belt 1 is composed of center belts 3a, 3b and a plurality of blocks 2 provided on the center belts. The blocks use the first block 2a in which the insert member is buried in resin and the second block 2b in which the insert member is not buried in resin together. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a high-load power transmission belt in which blocks are fixed at a predetermined pitch along the longitudinal direction of a center belt, and more specifically, to reduce the noise by eliminating the problem of the center belt protruding in such a belt and to reduce the noise. The present invention relates to a high-load transmission belt that achieves both lightweight and lateral pressure resistance.

  The belt used in the belt-type continuously variable transmission is used by being wound around a speed-change pulley that changes the effective diameter of the pulley by changing the V-groove width of the pulley and adjusts the speed ratio. Since the lateral pressure from the belt increases, the belt must withstand the large lateral pressure. In addition to the use of continuously variable transmission, it is necessary to use a belt that can withstand a high load especially in a high load transmission application in which the life of a normal rubber belt is too short.

  Among such belts, there is a high-load transmission belt in which a block is fixed to a center belt to increase the strength in the width direction of the belt. As shown in Patent Document 1, a block made of an elastomer relatively harder than the elastomer used for the center belt is fixedly fastened to a center belt buried in using a fastening material such as a bolt or a rivet. There is a belt having a groove on both side surfaces of a block and a pair of center belts fitted into grooves provided on the side surface.

  As the required quality of such a tension transmission type high load transmission belt, it is used for continuously variable transmission as described above. In the continuously variable transmission, the speed is changed by changing the effective diameter of the pulley around which the belt is wound, and the belt is used while moving back and forth between the large pulley diameter and the small pulley diameter according to the change in the pulley diameter. Will be.

  The material used for the block may be a thermosetting resin such as a phenol resin or an epoxy resin, or a thermosetting resin such as a polyamide resin on at least a contact surface of a core material made of aluminum or an alloy thereof with a pulley or a contact surface between blocks. Those coated with a plastic resin are used.

  In addition, reinforcing materials such as carbon fibers, glass fibers, and whiskers are mixed into these resin materials to increase the hardness and adjust the friction coefficient so that the resin materials can sufficiently withstand the lateral pressure from the pulley.

  Further, Patent Literature 2 discloses a belt capable of high-speed rotation by reducing the weight of the belt without embedding an insert material made of an alloy such as aluminum and reducing the centrifugal force during high-speed running. .

  Since the above-mentioned material is used as the block as compared with the conventional rubber belt, the noise level generated between the pulley and the pulley is higher than that of the conventional belt, and such a problem that the noise is reduced is such a problem. It was one of the common issues with belts.

  As means for measuring the noise reduction, for example, as described in Patent Document 3, the center belt is partially protruded from the side surface of the block, and the portion protruded by the side pressure from the pulley is applied. By composing the block to be flush with the block, the block can be brought into contact with the pulley first with the center belt made of a material such as rubber, and then the block comes into contact with the pulley. Methods for lowering the impact sound have been proposed.

  Patent Document 4 proposes a belt drive system in which the surface hardness of a pulley is set to a predetermined hardness or less to reduce the noise level during belt running and that the belt does not slip even when used for a long time. ing.

JP-A-63-34342 JP 2001-311453 A JP-A-60-49151 JP-A-7-27180

  However, in the method of Patent Document 3, after the center belt made of rubber is worn due to friction with the pulley, the effect of reducing noise cannot be seen, and the core embedded inside pops out. The present invention aims to provide a configuration for solving such a problem and further reducing noise.

  Further, in the belt as disclosed in Patent Literature 2, the opening of the groove of the block in which the center belt is fitted receives a side pressure from the pulley due to a temporal change while the belt is running, so that the opening expands. The fitting force between the center belt and the block is weakened, and the center belt protrudes from the block. When the center belt protrudes greatly from the block, the center belt is worn, and in some cases, a problem such as cutting may occur. In addition, there is a problem that the usability is poor in some cases, because the use is limited to the use of a relatively light load.

  Therefore, in the present invention, the problem that the center belt protrudes is eliminated, the noise during belt running is reduced, the centrifugal force is reduced by reducing the weight of the belt, and the belt can withstand a certain high load. It is another object of the present invention to provide a high-load transmission belt with improved lateral pressure resistance of the belt.

  In order to achieve the above object, the first aspect of the present invention comprises a center belt having a core buried in an elastomer, and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt. In the high-load transmission belt, the block includes a first block in which an insert material is embedded in a resin and a second block in which the insert material is not embedded in a resin.

  In claim 2, the number of first blocks: the number of second blocks is in the range of 7: 3 to 4: 6.

  The high load transmission belt according to claim 3, wherein the groove for fitting the center belt is opened on the side surface of the block, wherein the number of the first blocks is 10% or less of the total number of blocks, and the minimum number of the first blocks is 2%. It is a high-load transmission belt that is individual.

  According to a fourth aspect, a high-load transmission belt is provided in which the first block and the second block are randomly arranged.

  According to the fifth aspect, the first block and the second block are a high-load transmission belt regularly arranged so as to repeat a specific arrangement.

  As described above, according to claim 1 of the present invention, in a high-load transmission belt including a center belt in which a core body is embedded in an elastomer and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, The block comprises a first block in which an insert material is embedded in a resin and a second block in which the insert material is not embedded in a resin.

  In claim 2, the number of first blocks: the number of second blocks is in the range of 7: 3 to 4: 6.

  The high load transmission belt uses a predetermined ratio of the first block embedded with the insert material to improve the lateral pressure resistance of the belt and the light weight second block without the embedded insert material. And the belt can be reduced in weight, and has sufficient lateral pressure resistance to withstand a certain load.

  According to a third aspect of the present invention, there is provided a high-load transmission belt in which a groove for fitting a center belt is opened on a side surface of the block, wherein the number of the first blocks is 10% or less of the total number of the blocks, and the minimum number of the first blocks is Are two high-load transmission belts.

  By setting the ratio of the two blocks in this manner, the increase in the weight of the belt can be minimized, and the center belt can be prevented from protruding from the block. This is equivalent to a belt using only a block in which the insert material is not substantially buried, and a failure such as cutting due to protrusion of the center belt can be eliminated.

  According to a fourth aspect, a high-load transmission belt is provided in which the first block and the second block are randomly arranged.

  By arranging the belts at random, the periods of the first block and the second block that come into contact with the pulley when the belt is rotating are disturbed, so that it is possible to prevent a problem that large noise is generated due to resonance or the like.

  According to the fifth aspect, the first block and the second block are a high-load transmission belt regularly arranged so as to repeat a specific arrangement.

  By arranging both blocks regularly so as to repeat a specific arrangement, for example, alternately, the weight balance is good and the lateral pressure resistance of the belt can be evenly distributed in a well-balanced manner around the belt. Since no weak point is formed in the belt, stable running can be expected, and a stable belt can be obtained in terms of life.

  In a high-load transmission belt including a center belt in which a core is embedded in an elastomer and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, the block is a first belt in which an insert material is embedded in a resin. It comprises a block and a second block in which no insert material is embedded in the resin.

  Hereinafter, the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a schematic perspective view showing an example of a high-load transmission belt 1 according to the present invention, and FIG. 2 is a sectional side view thereof. The high-load transmission belt 1 according to the present invention comprises two center belts 3a and 3b having the same width in which a rope-shaped core 5 is spirally embedded in an elastomer 4, and upper and lower surfaces of the center belts 3a and 3b. A plurality of blocks 2 are fitted and locked and fixed to the concave ridges 18 and 19 formed at predetermined pitches on 6 and 7, respectively. Both side surfaces 8 and 9 of the block 2 are inclined surfaces that engage with the V-grooves of the pulleys, receive power from the driven pulleys, and are locked and fixed to the center belts 3a and 3b. And the power of the driving pulley is transmitted to the driven pulley.

  As shown in FIG. 1, the shape of the block 2 is composed of an upper beam portion 11 and a lower beam portion 12, and center pillars 13 connecting the central portions of the upper and lower beam portions 11 and 12. Are formed with grooves 14 and 15 in which the center belts 3a and 3b are fitted. Also, on the groove upper surface 16 and the groove lower surface 17 in the groove 15, the convex ridges 20 and 21 are engaged with the concave ridges 18 provided on the upper surface 6 and the concave ridges 19 provided on the lower surface 7 of the center belts 3a and 3b. Is provided.

  The block 2 includes a first block 2a in which an insert material 42 made of an alloy such as aluminum is embedded in a resin material 41 and a second block 2b in which such an insert material 42 is not embedded, as shown in FIG. At least two types of blocks 2a, 2b are used in combination, and the two types of blocks 2a, 2b are randomly arranged in the longitudinal direction of the center belt 3 or regularly arranged so as to repeat a specific arrangement. ing.

  Further, in the present invention, two ratios of the number of the first blocks 2a and the number of the second blocks are set in the second and third aspects, and in the second aspect, the ratio is in the range of 7: 3 to 4: 6. According to claim 3, the ratio of the first block number to the total block number is 10% or less, and the minimum number of the first blocks 2a is two.

  By setting the ratio in the range of 7: 3 to 4: 6 as in claim 2, the advantage in the case where all the blocks are the first block 2a in which the insert material is embedded, and all the blocks are not embedded with the insert. The belt 1 can be made to have the advantages of the second block 2b in half each, and the belt 1 has lateral pressure resistance enough to transmit a relatively high torque, and the belt 1 can be reduced in weight. As a result, the centrifugal force during running can be reduced, so that the life of the belt can be extended.

  Further, the number of the first blocks 2a is set to 10% or less of the total number of blocks and the minimum number is set to two, so that the first blocks 2a in which the insert material is embedded are used. Therefore, the problem of weight increase can be minimized, and the center belts 3a, 3b are fitted even if the effect of improving the lateral pressure resistance of the belt 1 cannot be obtained. Since the protrusions can be prevented from protruding from the grooves 14 and 15 on the side surfaces of the block, problems such as wear and cutting of the center belts 3a and 3b can be solved. The case of claim 3 has an effect in the case of a belt as shown in FIGS. 1 and 2 having grooves 14 and 15 for fitting the center belt on the side surface of the block.

  Regarding the arrangement of the first block 2a and the second block 2b, by arranging them regularly so as to repeat a specific arrangement, for example, alternately for each specific number, the weight is well balanced in the entire belt, It is also preferable in terms of the lateral pressure resistance and the prevention of the center belt from protruding from the block because the belt becomes uniform over the entire circumference of the belt. In the case of regularly arranging, there are cases where the first block 2a is alternately arranged every other block or alternately every other block. After arranging them, one second block 2b may be interposed and two first blocks 2a may be arranged.

  As shown in FIG. 2, the first block 2a is a resin material 41 in which an insert material 42 is buried in a resin material 41. The insert material 42 serves as a portion for providing the block 2 with the lateral pressure resistance and the bending rigidity. Examples of the material include materials such as magnesium alloys, aluminum alloys, ceramics, composite materials of ceramics and aluminum, carbon fiber reinforced resin, and iron having a magnesium content of 90% or more.

A metal material is preferable in terms of imparting lateral pressure resistance and bending rigidity. Among the metal materials, for example, an aluminum alloy has an elastic modulus of 7000 kgf / mm ² and a specific gravity of 2.8, whereas iron has an elastic modulus of 2.8 kgf / mm ^2. At 22,000 kgf / mm ² , the specific gravity is 7.8, which means that iron is high in strength. However, for a belt that rotates at a high speed, it is preferable to use an aluminum alloy or a magnesium alloy, particularly a magnesium alloy, which is advantageous in terms of weight reduction because the belt weight greatly affects the life.

  As the magnesium alloy, those having a magnesium content of 90% or more, more preferably 94 to 98% can be used, and examples thereof include AZ31, AZ61, and AZ91D. The alloying component to be added includes rare earths such as aluminum, scandium, yttrium, and lanthanum, manganese, silicon, tungsten, zinc, and the like, and is not particularly limited. It is preferable to use a material to which silicon or the like is added.

  In addition, the use of magnesium alloy also excels in vibration energy absorption characteristics, has the effect of reducing belt noise, and does not lead to breakage of blocks, etc., even when repeatedly subjected to impacts from pulleys while the belt is running. . In addition, it is possible to provide a stable traveling with a small change in dimension even when the temperature becomes high during running and becomes low when stopped.

  In the case where the resin material 41 is disposed at a predetermined position, if the resin material 41 is used to cover almost the entire surface thereof using an insert material 42 made of a metal material slightly smaller than the size of the block 2, the resin material 41 is partially used. This is a preferred embodiment because problems such as peeling of the resin material are less likely to occur than those in which the cover 41 is disposed. However, even though the entire surface is in contact with the member for fixing the insert material 42 when the resin material 41 is coated in the manufacturing process, a place where the insert material 42 is exposed occurs, Such exposure of the insert material 42 may be included in a form in which the entire surface is substantially covered with the resin material.

  The resin material 41 covering the insert material 42 has a relatively large coefficient of friction and excellent wear resistance, and has a higher rigidity than the elastomer 2 constituting the center belt 4, specifically, a hardness of 90 ° JIS A or more. Hard rubber, hard polyurethane resin, liquid crystal resin, phenolic resin, epoxy resin, polyester resin, acrylic resin, methacrylic resin, polyamide resin, polyamideimide (PAI) resin, polyphenylene sulfide (PPS) resin, polybutylene terephthalate (PBT) resin Rubber or synthetic resin such as polyimide (PI) resin, polyethersulfone (PES) resin, and polyetheretherketone (PEEK) resin are used.

  In addition, in these resins, cotton yarn, synthetic fibers such as polyamide fibers and aramid fibers, glass fibers, metal fibers, woven fabrics made of carbon fibers, fillers, whiskers, silica, inorganic materials such as calcium carbonate were mixed. Made of reinforced resin.

  The second block 2b is made of only the resin material 41. When the second block 2b in which the insert material 42 is not embedded is used, the weight can be reduced as compared with the belt using the block in which the insert material 42 is embedded. Although it has the advantage of low centrifugal force, it is suitable for relatively light loads and high-speed applications such as motorcycles. In the present invention, by using both the first block 2a in which the insert material 42 is embedded and the second block 2b in which the insert material 42 is not embedded, the weight is reduced as compared with the belt having the first block 2a in which the insert material is embedded in all the blocks 2. As for the lateral pressure resistance, the entire block 2 can be formed as a belt which is not so inferior to the case where a block in which the insert material 42 is embedded is used.

  Here, the insert material 42 refers to a frame-like material having a substantially block shape by itself. For example, adding a reinforcing material such as short fibers or whiskers to be added to a synthetic resin material is an insert. It does not mean that the material 42 is embedded.

  As the resin of the block 2b, specifically, a hard rubber having a hardness of 90 ° JIS A or more, a hard polyurethane resin, a liquid crystal resin, a phenol resin, an epoxy resin, a polyester resin can be used similarly to the resin material used for the block 2a. , Acrylic resin, methacrylic resin, polyamide resin, polyamide imide (PAI) resin, polyphenylene sulfide (PPS) resin, polybutylene terephthalate (PBT) resin, polyimide (PI) resin, polyether sulfone (PES) resin, polyether ether Rubber or synthetic resin such as ketone (PEEK) resin is used. And the like.

  Among these, a thermoplastic resin such as a polyamide resin is used to manufacture a block by an injection molding method in order to efficiently manufacture the block. In addition, nylon is one of the best polyamide resins because it has a low coefficient of friction, has excellent wear resistance, has rigidity, has elasticity against bending, and does not easily break. It can be said that 46 is preferable.

  In the present invention, it is possible to mix a fibrous reinforcing material or a whisker-like reinforcing material in the resin material forming the block as described above, and the fibrous reinforcing material is compounded in a range of 15 to 40% by weight. I do. If the amount is less than 15% by weight, there is a problem that the reinforcing effect is small and the abrasion resistance of the block is not sufficient. If the amount is more than 40% by weight, it becomes difficult to mix the resin with the resin or injection molding becomes difficult. It is not preferable because there is a problem.

  Examples of the fibrous reinforcing material to be added to the synthetic resin include aramid fiber, carbon fiber, glass fiber, polyamide fiber, polyester fiber and the like. Among them, by using a combination of nylon 46 and carbon fiber, which are preferable examples of the resin constituting the block, carbon fibers improve the water absorbing defect of nylon 46 and can significantly improve rigidity. In addition, the wear resistance, impact resistance, and fatigue resistance of nylon 46 can be utilized. Among carbon fibers, it is preferable to use PAN-based carbon fibers. Also, by blending the aramid fiber in combination with the carbon fiber, the toughness of the block is improved, and the wear resistance and impact resistance can be further improved.

  Here, the PAN-based carbon fiber used has good compatibility with the thermoplastic resin, and the length of the carbon fiber used is preferably 1 to 5 mm. If it is less than 1 mm, the block will not be sufficiently reinforced, and if it exceeds 5 mm, it will be difficult to knead with the resin, or it will break during kneading, which is not preferable.

  Further, in addition to the above organic fibers, inorganic fibers such as zinc oxide whiskers, potassium titanate whiskers, and aluminum borate whiskers may be blended as the fibrous reinforcing material.

  By adopting such a material configuration, it has sufficient strength such as rigidity and toughness that can sufficiently withstand the side pressure received when it comes into contact with the pulley, has excellent wear resistance, and furthermore, with respect to heat generated during friction. It is also possible to form a strong block, and the power received from the pulley can be efficiently transmitted to the center belts 3a and 3b as a tensile force, so that a high load transmission belt of a tension transmission type can be configured.

  In addition, the lubricity of the block 2 can be improved by mixing at least one selected from molybdenum disulfide, graphite, and a fluororesin. Examples of the fluorine resin include polytetrafluoroethylene (PTFE), polyfluoroethylene propylene ether (PFPE), tetrafluoroethylene hexafluoropropylene copolymer (PFEP), and polyfluoroalkoxyethylene (PFA). .

  The lower beam of the block 2 must be allowed to bend so that the belt can wind around the pulley, and an inclined surface is provided on at least one of the front and rear surfaces in the belt running direction. By providing the inclined surface, the belt can be bent without damping the blocks.

  The material used as the elastomer 4 of the center belts 3a and 3b is a single material such as chloroprene rubber, natural rubber, nitrile rubber, styrene-butadiene rubber, hydrogenated nitrile rubber, or a rubber or polyurethane rubber appropriately blended with them. No. As the core 5, a rope selected from polyester fiber, polyamide fiber, aramid fiber, glass fiber, steel wire and the like is used. The core body 5 may be made of a woven fabric, a knitted fabric, a thin metal plate, or the like made of the above-described fiber, in addition to the rope embedded in a spiral shape.

  FIG. 3 is an example of another belt, in which a pair of side pillars 32 and 33 extend upward from both ends of the beam portion 31, and each of the side pillars 32 and 33 is directed toward the center of the block 2 from the upper end thereof. The lock portions 34 and 35 that extend are provided so as to face each other. The beam portion 31, the side pillars 32 and 33, and the lock portions 34 and 35 form a fitting groove 30 into which the center belts 3a and 3b fit. The center belts 3a and 3b are inserted into the fitting grooves 30 through the openings between the lock portions 34 and 35, and are mounted.

  Further, convex portions 37 are provided on the fitting grooves 30 side of the lock portions 34 and 35, respectively, and the convex portions 37 are fitted into concave portions 36 provided at predetermined pitches on the center belts 3a and 3b. I do. As a result, the center belts 3a and 3b are hardly removed from the block 2 after wearing. The block 2 is a combination of a first block 2a in which an insert material 42 is embedded in a resin material 41 and a second block 2b that is not so, and is randomly or regularly arranged and falls within the scope of the present invention. It is.

  Next, tests for confirming the effects of the present invention were carried out with reference to Examples and Comparative Examples. The block used in the high-load transmission belt according to the present invention is not limited to the embodiment shown in the present embodiment.

  First, when the ratio of the number of the first blocks and the number of the second blocks in the second aspect is set in the range of 7: 3 to 4: 6, a certain degree of lateral pressure resistance can be obtained, and the belt can be made lightweight. A test was conducted to confirm that it was possible.

(Example 1)
Example 1 used a belt in which a first block in which an insert material was embedded in a resin material and a second block in which no insert material was embedded were alternately arranged as blocks. A belt circumference was 690 mm, a block pitch was 3 mm, a block thickness was 3 mm, a phenol resin was used as a resin material constituting the block, and an insert material made of an aluminum alloy was used as an insert material. A hydrogenated nitrile rubber was used as the elastomer for the center belt, and a rope made of aramid fiber was buried spirally in the elastomer as the core. The belt was run under the conditions shown in Table 1, and the noise level and life were measured. Table 2 shows the results.

(Comparative Example 1)
In Comparative Example 1, a belt was manufactured under the same conditions as in Example except that all the blocks were the first blocks in which an insert material was embedded in resin. The belt was run under the conditions shown in Table 1, and the noise level and life were measured. Table 2 shows the results.

(Comparative Example 2)
In Comparative Example 2, a belt was manufactured under the same conditions as in Example except that all the blocks were second blocks in which no insert material was embedded in the resin. The belt was run under the conditions shown in Table 1, and the noise level and life were measured. Table 2 shows the results.

  As can be seen from the results in Table 2, the example of the present invention has a low noise and has a life that is not so inferior to that of Comparative Example 1 using the first block with inserts. On the other hand, the life of the comparative example 1 is longer than that of the example, but the noise is high, and the use of the second block without the embedded insert material in the present invention reduces the noise. It can be seen that it has contributed.

  Further, it can be seen that the life of Comparative Example 2 is significantly shorter than that of the Example, and that the life can be significantly extended under a large load condition by using the first block in which the insert material is embedded.

  Next, in the case where the number of the first blocks in claim 3 is 10% or less in all the blocks and the minimum number is two, there is substantially no substantial weight increase, so the tension due to the centrifugal force during traveling is reduced. A test was conducted to confirm that there was no increase and that the center belt could not protrude from the block.

(Example 2)
In the second embodiment, the first block in which the insert material is buried in the resin material is placed at an equal position in the entire circumference of four blocks, and the remaining blocks are entirely buried with the insert material. A belt which was not used as the second block was used. The belt circumference is 690 mm, the block pitch is 3 mm, and the block thickness is 3 mm. A phenol resin is used as the resin material constituting the block in the first block in which the insert material is embedded, and an insert material made of an aluminum alloy is used as the insert material. Using. As the resin constituting the second block in which the insert is not embedded, 46 nylon resin was used.

  A hydrogenated nitrile rubber was used as the elastomer for the center belt, and a rope made of aramid fiber was spirally embedded in the elastomer for the core. The belt was run for 200 hours under the conditions shown in Table 3, and the amount of the center belt of the running belt protruding from the side surface of the block was measured. Table 4 shows the results.

(Example 3)
Example 3 has a belt similar to that of Example 2 except that eight first blocks in which an insert material is buried in a resin material are arranged at equal positions in the entire circumference when the total number of blocks is 230. Using. The belt was run for 200 hours under the conditions shown in Table 3, and the amount of the center belt of the running belt protruding from the side surface of the block was measured. Table 4 shows the results.

(Example 4)
In Example 4, a belt similar to that of Example 2 was used except that the total number of blocks was 230 and the first blocks in which the insert material was buried in the resin material were arranged at equal positions in the entire circumference of 16 blocks. Using. The belt was run for 200 hours under the conditions shown in Table 3, and the amount of the center belt of the running belt protruding from the side surface of the block was measured. Table 4 shows the results.

(Comparative Example 3)
Comparative Example 3 used the same belt as that of Example 2 except that a second block in which all the blocks did not embed the insert material in the resin material was arranged as the block. The belt was run for 200 hours under the conditions shown in Table 3, and the amount of the center belt of the running belt protruding from the side surface of the block was measured. Table 4 shows the results.

(Comparative Example 4)
Example 4 Example 2 was the same as Example 2 except that the first block in which the insert material was buried in the resin material was placed at an equal position in the entire circumference of 32 (more than 10%) blocks where the total number of blocks was 230. The same belt was used. The belt was run for 200 hours under the conditions shown in Table 3, and the amount of the center belt of the running belt protruding from the side surface of the block was measured. Table 4 shows the results.

  As can be seen from the results in Table 4, by limiting the ratio of the number of the first blocks to the range defined in claim 3, the amount of the center belt protruding from the blocks can be suppressed to a small value. On the other hand, if the ratio of the first block is too large, the centrifugal tension during the running of the belt increases and the life is shortened.

  It is a belt that can transmit high loads used for driving motorcycles such as automobiles and scooters, and agricultural machinery.

1 is a schematic perspective view illustrating an example of a high-load transmission belt according to the present invention. FIG. 2 is a cross-sectional view of a high-load transmission belt illustrating a first block. It is a sectional side view of a high load transmission belt. FIG. 4 is a schematic perspective view showing another example of the high-load transmission belt according to the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Block 2a 1st block 2b 2nd block 3a Center belt 3b Center belt 4 Elastomer 5 Core 6 Upper surface 7 Lower surface 11 Upper beam part 12 Lower beam part-13 Center pillar 14 Fitting groove 15 Fitting groove

Claims (5)

  In a high-load transmission belt including a center belt in which a core is embedded in an elastomer and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, the block is a first belt in which an insert material is embedded in a resin. A high-load transmission belt comprising a block and a second block in which an insert material is not embedded in a resin.   The high load transmission belt according to claim 1, wherein the number of the first blocks: the number of the second blocks is in a range of 7: 3 to 4: 6.   A high-load transmission belt in which a groove for fitting a center belt is opened on a side surface of a block, wherein the number of first blocks is 10% or less of the total number of blocks, and the minimum number of first blocks is two. The high load transmission belt according to claim 1.   The high-load transmission belt according to claim 1, wherein the first block and the second block are randomly arranged. 4. The high-load transmission belt according to claim 1, wherein the first block and the second block are arranged regularly so as to repeat a specific arrangement.

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