JP4933135B2 - High load transmission belt - Google Patents

Description

  The present invention relates to a high-load transmission belt in which a block is fixed at a predetermined pitch along the longitudinal direction of the center belt, and in particular, is lightweight and excellent in bending elastic modulus, impact resistance, wear resistance, and dimensional accuracy, and the center belt The present invention relates to a high load transmission belt that prevents movement between the motor and a block.

  The belt used in the belt type continuously variable transmission is used by being wound 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 gear ratio. Because the side pressure from 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. A block made of an elastomer that is relatively harder than the elastomer used for the center belt is fixed to the center belt embedded in the elastomer using a fixing material such as a bolt or a rivet.

  The required quality of the block used in such a tension transmission type high load transmission belt is the purpose of high load transmission in friction transmission as described above, so bending fatigue, wear resistance, heat resistance, rigidity It is necessary to have a good balance of properties such as impact resistance. Another important factor is 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 come into contact is coated with an insert material made of metal or the like by a resin molding material in which a rubber component is added to a phenolic resin component. It is.

  In addition, Patent Document 2 is a belt using a block in which a metal insert is not embedded, and since it does not have a metal insert, the strength of the block is somewhat inferior, but the belt is greatly increased. It is possible to reduce the weight. Belts using blocks with embedded inserts are relatively heavy, and if the belt is rotated at high speed, there is a problem that the center belt deteriorates quickly due to centrifugal force, so it is not suitable for high rotation applications. It was. On the other hand, a belt in which a metal insert as disclosed in Patent Document 2 is not embedded has few problems of centrifugal force and can be applied to high rotation.

  Further, in Patent Document 3, the thickness of the center belt is set to be larger than the width of the groove of the block, thereby eliminating the rattling between the center belt and the block, thereby suppressing the rocking of the block. Techniques for preventing wear and heat generation are disclosed.

  Patent Document 4 discloses a belt in which an uneven surface is provided on an upper block and a low-grade elastomer provided on the upper surface of the center belt is disposed so that the uneven surface is bitten into the elastomer so that the block and the center belt are firmly fixed. ing.

  Further, such a tension transmission type high load transmission belt has a problem in that friction is always generated between the block and the center belt during running of the belt, and the center belt and the block are deteriorated due to concentration of stress and heat generation. In addition, in the case of such a belt, since it is used as a continuously variable transmission as described above, it has a mechanism for shifting by changing the effective diameter of a pulley around which the belt is wound. It will be used with pulley diameter.

  In particular, when the belt is wound around a small pulley diameter, the inner peripheral surface side of the center belt is sandwiched between the blocks, stress is concentrated and a large frictional force is generated, and the rubber constituting the center belt deteriorates. Cracks occurred or belts were cut.

  In order to alleviate the concentration of stress applied to the center belt, Patent Document 5 sets so that the upper end of the convex portion provided on the inner peripheral surface of the center belt is positioned above the lower end position of the convex portion of the block. Thus, a belt has been proposed in which the convex portion of the center belt is not pinched by a block when the belt is wound around a pulley and bent.

  In Patent Document 6, a gap between the block and the center belt is set by setting the curvature radius of the convex portion formed by the block smaller than the radius of curvature of the concave portion formed on the inner peripheral surface of the center belt at the portion where the block and the center belt are fitted. A belt is disclosed which is provided with

  Patent Document 7 discloses a block in which strength is improved by using a resin composition in which a fibrous reinforcing material such as carbon fiber and a whisker-like reinforcing material such as zinc oxide whisker are blended with a thermoplastic resin as a block. A technique has been disclosed in which the weight of the belt can be reduced and the centrifugal force acting on the belt can be reduced.

  Patent Document 8 discloses a belt having an uneven fitting structure between a center belt and a block.

Japanese Patent Laid-Open No. 63-34342 JP 2001-31453 A Japanese Utility Model Publication No. 1-55344 JP-A-7-197997 Japanese Patent Laid-Open No. 62-151646 Japanese Patent Laid-Open No. 9-25999 JP 2001-31453 A Japanese Utility Model Publication No. 60-154646

  Recently, due to diversification of needs, there has been a demand for a high-load transmission belt that can be rotated at a high speed although the load is a little lower than the conventional one.

  For this reason, for example, since the belt disclosed in Patent Document 1 uses an aluminum alloy or the like as an insert material, if it rotates at a high speed, a large centrifugal force is applied due to its weight, and a large tension acts on the belt. As a result, there has been a problem that the belt is prematurely damaged.

  The belt of Patent Document 2 does not have an insert material in the block. If a metal insert material such as an aluminum alloy is not used, the weight of the block can be reduced and the weight of the entire belt can be significantly reduced. Therefore, the belt can be advantageous for high-speed rotation.

  However, a reduction in the strength of the block cannot be avoided in exchange for reducing the weight of the belt, and the block is relatively susceptible to bending. Such a belt has a structure in which an elastomer center belt is mounted in a groove provided in the block. However, since the upper and lower beams of the block also bend when the center belt is mounted, the center belt and the block Looseness occurs between.

  On the other hand, in order to solve the problems such as wear and heat generation due to the rocking of the block as described in Patent Document 3, there is a measure to make the thickness of the center belt larger than the width of the groove of the block. There is a problem that the deflection of the upper and lower beams is further increased in the block in which the beam is not embedded. The movement in the belt width direction between the center belt and the block has a problem that the transmission performance of the belt is lowered or noise is generated. In order to prevent rattling, it is conceivable to increase the compression ratio by setting the width of the groove provided in the block to be smaller than the thickness of the center belt. This leads to a problem that the mounting work becomes difficult and a problem that the heat generated when the belt is bent increases.

  In Patent Document 4, an upper block and a lower block are independently fastened with a rivet or the like with a center belt interposed therebetween, and the center belt is not fitted and attached to a groove portion of the block. Further, the zigzag shape of the upper block is bitten into the center belt, but the movement is restricted only in the longitudinal direction of the belt.

  By adopting the configuration as in Patent Document 5 and Patent Document 6, friction is generated between the block and the center belt due to the bending of the belt, and stress is concentrated on the inner peripheral surface, and the center belt is cracked. The occurrence of problems such as the occurrence of heat generation and deterioration of materials such as rubber due to heat generation can be mitigated.

  However, the center belt constrained by the block bends, especially by bending with a small pulley diameter, the friction between the block and the center belt is generated more strongly and heat is generated, and the inner peripheral surface is The problem that internal compression will inevitably occur due to large compression and lead to wear of the center belt cannot be solved.

  Moreover, when the resin composition which mix | blended whisker-like reinforcement materials, such as a zinc oxide whisker, was used for the block like patent document 7, when friction generate | occur | produced between a block and a center belt, a whisker-like reinforcement material is used. As a result, the wear of the center belt was further promoted, which led to the occurrence of a failure such as cutting of the center belt.

  The belt of Patent Document 8 is provided with a plurality of center belts, and the center belts are also fitted with unevenness, and the purpose is to prevent displacement between the center belts. Further, the center belt is provided with a recess so as to be fitted with the convexity of the block, and the convexity of the block is not cut into the central belt.

  Therefore, the present invention solves such problems, and the movement of the block in the belt width direction between the block and the center belt is strongly restricted, so that the block swings or the block is inclined with respect to the belt width direction. It is an object of the present invention to provide a high-load transmission belt that does not cause slanting while traveling and protects the center belt and prevents cutting problems due to wear, heat generation, deterioration, and the like.

In order to achieve the above-described problems, according to claim 1 of the present invention, a center belt in which a core is embedded in an elastomer, an upper beam and a lower beam are connected by pillars, and an upper and lower beam for mounting the center belt. and consists of a block having a groove surrounded by the pillar, it becomes provided with a regulating means for regulating the longitudinal direction of the belt and the belt width direction of the movement between the blocks and the center belts in said groove, at least the center belt In a high-load transmission belt in which a fiber member is present at a location in contact with the block on the surface, the belt width direction ridge provided on the groove upper surface and the groove lower surface in the groove portion of the block by the means for regulating the movement in the belt longitudinal direction. parts and concave portions in the belt width direction provided in the center belt is fitted configuration to each other, further, the belt width direction of movement Means for regulating has irregularities on at least one of the convex portion provided on the groove top or groove bottom surface of the groove of the block, a structure in which bite into the irregular center belt, characterized in that.

Claim 2 is the invention of claim 1, the means for restricting the movement of the belt width direction, from at least one of the top of the convex portion provided on the groove top and the groove bottom surface of the groove of the block, one projecting This is a high load transmission belt provided with the above protrusions.

According to a third aspect of the present invention, in the first aspect of the invention, the means for regulating the movement in the belt width direction is provided on at least one of the front and rear surfaces in the belt traveling direction of the protrusions provided on the groove upper surface and the groove lower surface in the groove portion of the block. This is a high load transmission belt provided with a recess.

According to a fourth aspect of the present invention, in the invention of the first aspect, the means for regulating the movement in the belt width direction has a zigzag-shaped unevenness on at least one top portion of the protrusions provided on the groove upper surface and the groove lower surface in the groove portion of the block. A high load transmission belt provided.

According to a fifth aspect of the present invention, in the invention of the first aspect, the means for regulating the movement in the belt width direction provides a convex portion on the side end side of the block of the convex strip portion provided on the groove upper surface and the groove lower surface in the groove portion of the block. This is a high load transmission belt.

According to a sixth aspect of the present invention, in the first aspect of the invention, the means for regulating the movement in the belt width direction is a protrusion that continuously extends in the belt longitudinal direction on at least one of the groove upper surface and the groove lower surface in the groove portion of the block. A high load transmission belt is provided.

A seventh aspect of the present invention is the high load transmission belt according to any one of the first to sixth aspects, wherein the uneven height difference is 0.05 to 0.3 mm.

An eighth aspect of the present invention is the high load transmission belt according to any one of the first to seventh aspects, wherein the fiber member is a cover canvas covered on the surface of the center belt.

A ninth aspect of the present invention is the high load transmission belt according to any one of the first to seventh aspects, wherein the fiber member is a short fiber in an elastomer forming a center belt.

A tenth aspect of the present invention is the high load transmission belt according to any one of the first to ninth aspects, wherein no insert material is embedded in the block.

In Claim 11 , in the invention of any one of Claims 1 to 10, the block is mainly composed of a thermoplastic resin and a fibrous reinforcing material, and the fibrous reinforcing material is 1 to 60% by mass. It is a high-load transmission belt that is blended in proportions.

In Claim 12 , in the invention of Claim 11, the thermoplastic resin is any one of 4,6-nylon, 9T-nylon, polyphenylene sulfide, polyether ether ketone, polyether sulfone, and polyamideimide. It is a transmission belt.

A thirteenth aspect of the present invention is the high load transmission belt according to the eleventh or twelfth aspect of the invention, wherein the fibrous reinforcing material is a carbon fiber alone or a combination of carbon fiber and aramid fiber.

In a fourteenth aspect , in the invention according to any one of the eleventh to thirteenth aspects, the block is a high load transmission belt in which a whisker-like reinforcing material is blended at a ratio of 1 to 30% by mass.

According to a fifteenth aspect of the present invention, in the invention of the fourteenth aspect, the whisker-like reinforcing material is a high load transmission belt which is a zinc oxide whisker.

In a sixteenth aspect of the present invention, in the invention of the fourteenth or fifteenth aspect, a thermoplastic resin composition not containing a whisker-like reinforcing material is disposed on the contact surface of the block with the center belt, and fibers are disposed on the contact surface with the pulley. A thermoplastic resin composition in which a whisker-like reinforcing material and a whisker-like reinforcing material are blended, and the whisker-like reinforcing material is not blended in the entire area of the contact surface with the center belt of the block And the ratio of the thermoplastic resin composition containing the whisker-like reinforcing material in the total area of the contact surface with the pulley of the block is 70% or more, respectively.

In a seventeenth aspect of the present invention, in the invention according to any one of the first to sixteenth aspects, the cover canvas on the surface of the center belt is subjected to an adhesion treatment, and the high load transmission belt is formed by blending an adhesive treatment agent with a friction coefficient reducing material. It is said.

According to claim 18 , in the invention according to any one of claims 1 to 17, the cover canvas is a high load formed by using a width of 55 to 70% of the width after shrinking by the bonding process before the bonding process. It is a transmission belt.

According to a nineteenth aspect of the present invention, in the invention according to any one of the first to eighteenth aspects, in the high load transmission belt provided with a center belt and a plurality of blocks along the longitudinal direction of the center belt, the center belt is in the elastomer. A high-load transmission belt is provided that has a protective layer with a thickness of 1 to 100 μm on the surface of the part that embeds the core and contacts at least the block.

According to claim 20 , in the invention of claim 19, the protective layer is a high load transmission belt made of urethane resin.

In a twenty-first aspect , in the invention according to the nineteenth aspect , a high load transmission belt in which the protective layer is a metal plating layer.

In a twenty-second aspect , in the invention according to the twenty-first aspect, the metal plating layer is a high load transmission belt including a fluororesin.

According to a twenty- third aspect , in the invention according to any one of the first to twenty-second aspects, the cover canvas on the upper and lower surfaces of the center belt is a high-load transmission belt in which at least the wefts in the belt longitudinal direction are canvases made of aramid fibers.

In the high-load transmission belt according to claims 1 to 7 of the present invention, in order to fix and hold between the block and the center belt, the movement in the belt longitudinal direction and the belt width direction between the block and the center belt. Is a high load transmission belt in which a fiber member is present on at least the surface of the center belt that is in contact with the block, and a looseness occurs between the block and the center belt. It is possible to prevent a problem that friction is generated between the belts and heat is generated and eventually the belt is broken. And by making a fiber member exist in the center belt surface, generation | occurrence | production of the heat generation can be reduced even if friction with a block arises while generation | occurrence | production of the crack with a center belt is prevented.

  More specifically, an elastomer material constituting the center belt is provided by providing irregularities for restricting movement of the center belt in the belt width direction with respect to the block on at least one of the groove upper surface or the groove lower surface in the groove portion of the block. The movement between the block and the center belt is strongly restricted. Therefore, problems such as wear and heat generation of the center belt and block can be prevented. In addition, since the cover canvas is provided on the upper and lower surfaces of the center belt, it is possible to prevent the center belt from being worn even if friction between the belt and the block occurs. It is possible to reduce troubles such as occurrence of slack of the belt and cutting of the belt.

By making the height difference of the unevenness of the block within the predetermined range as in claim 7 , the function of regulating the movement of the block and the center belt can be sufficiently exerted, and the unevenness is too large, and conversely the center belt It is possible to provide a high-load transmission belt that does not reduce the strength of the belt.

According to the eighth aspect of the present invention , the fiber member is a cover canvas, so that the center belt can be protected from biting by unevenness provided in the block, and problems such as the occurrence of cracks in the center belt can be prevented.

According to the ninth aspect , the fiber member is a short fiber in the elastomer constituting the center belt, and the fiber member can be arranged on the surface of the center belt more easily and at low cost.

In claim 10 , since the insert material such as an aluminum alloy is not embedded as the block, the belt is lightweight and is not damaged by the centrifugal force during traveling, and is suitable for use at high speed rotation. Although there is a problem that bending is likely to occur, both of them can be provided by providing irregularities that restrict the movement of the center belt in the belt width direction relative to the block provided on the upper surface or the lower surface of the groove as described in claim 1. Shaking can be prevented.

According to the eleventh aspect , it is possible to reduce the weight of the block by adding a fibrous reinforcing material as a reinforcing material for the block made of the thermoplastic resin to improve the strength, and to reduce the acting centrifugal force. Can do.

In claim 12 , any of 4,6-nylon, 9T-nylon, polyphenylene sulfide, polyether ether ketone, polyether sulfone, and polyamideimide, and particularly preferably 4,6-nylon is used as the thermoplastic resin. Thus, injection molding becomes possible, and the block can be easily manufactured.

According to the thirteenth aspect , by adding carbon fiber, the hardness is increased and the wear resistance is excellent. Also, by combining carbon fiber and aramid fiber, the hardness, which is a characteristic of carbon fiber, and the toughness, which is the characteristic of aramid fiber, are improved and wear resistance is also excellent. it can.

According to the fourteenth aspect , the strength is improved by adding a whisker-like reinforcing material in addition to the fibrous reinforcing material as the reinforcing material of the block made of the thermoplastic resin, and the weight of the block can be further reduced. At the same time, even if a high-strength canvas such as aramid fiber is used as the cover canvas on the surface of the center belt, the block will not be worn and heat generation will be reduced, so that the resin material constituting the block will be prevented from deteriorating. Also become.

According to the fifteenth aspect , since the zinc oxide whisker has a high specific gravity and a high rigidity, vibration when the block enters the pulley can be reduced and belt noise can be reduced. Moreover, since the friction coefficient is stabilized by adding zinc oxide whisker, the wear resistance is further improved.

According to the sixteenth aspect , it is possible to prevent the center belt from being worn and to reinforce the block with a whisker and prevent the block from being worn by friction with the pulley.

In Claim 17 , since the thing which mix | blended the friction coefficient reducing material was used for the adhesive treatment agent of the cover canvas, the friction coefficient between a block and a cover canvas can be reduced, and the degree of wear is reduced more. In addition, the heat generation can be reduced.

In claim 18 , since the cover canvas used has a width of 55 to 70% after the shrinkage due to the bonding process, the cover canvas is highly stretchable. The canvas is easy to follow along the mold, and the uneven shape of the center belt that meshes between the block and the center belt can be formed to the shape and height as designed.

According to the nineteenth aspect , by disposing a protective layer on the surface of the center belt, the center belt can be further protected from friction with the block when the belt is running, and failure such as belt cutting can be reduced. Further, the heat generation can be reduced, and the deterioration of the resin material constituting the block can be prevented.

In claim 20 , a urethane resin is used as the reinforcing resin, and in claim 21 , a metal plating layer is used, which is excellent in wear resistance and heat resistance. The deterioration can be reduced.

Also it is possible when containing fluorine resin on the metal plating layer as in claim 22 to a wear amount small things though rubbed with the block lower coefficient of friction.

According to the twenty- third aspect, the cover canvas on the upper and lower surfaces of the center belt is a canvas whose wefts in the longitudinal direction of the belt are made of aramid fibers, so that the protection against wear of the center belt by the canvas is further strengthened, and the life of the belt can be extended. it can.

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

  FIG. 1 is a perspective view showing a main part of an example of a high load transmission belt 1 according to the present invention, and FIG. 2 is a side view of the main part. The high-load transmission belt 1 of the present invention is fixed to two center belts 3a and 3b having the same width formed by embedding a core wire 5 in a spiral shape in an elastomer 4, and the center belts 3a and 3b. A plurality of blocks 2. Both side surfaces 2a, 2b, 2c, and 2d of the block 2 are inclined surfaces that engage with the V-grooves of the pulley, and receive the power from the driven pulley and are locked and fixed. The belts 3a and 3b are pulled, and the power of the driving pulley is transmitted to the driven pulley.

  The block 2 includes an upper beam 11 and a lower beam 12, and pillars 13 that connect the central portions of the upper and lower beams 11 and 12, and a pair of center belts are provided on both side surfaces 2a, 2b, 2c, and 2d of the block 2. Grooves 14 and 15 for fitting 3a and 3b are formed.

  In the present invention, the block 2 and the center belts 3a and 3b are provided with restricting means for restricting the movement in the belt longitudinal direction and the belt width direction, and at least at the place where the surface of the center belts 3a and 3b comes into contact with the block 2. Has arranged the fiber member. In the case of a belt in which the center belts 3a and 3b are fitted and mounted in the grooves 14 and 15 that open to the side surfaces 2a, 2b, 2c, and 2d of the block 2, the upper and lower beams 11 and 12 of the block may be bent and deformed. Due to the permanent distortion of the elastomer 4 constituting 3a, 3b, looseness occurs in the fitting between the block 2 and the center belts 3a, 3b, and the block 2 swings relative to the center belts 3a, 3b or moves in the belt width direction. As a result, there has been a problem that the belt is broken, for example, friction occurs and heat is generated and the center belt is cut. As in the present invention, the block 2 and the center belts 3a and 3b can be prevented from being loosened for a long time by providing a regulating means for regulating the movement in the belt longitudinal direction and the belt width direction. The above problems can be solved.

  Specifically, as means for restricting the movement of the block 2 and the center belts 3a and 3b in the belt longitudinal direction, the groove upper surfaces 16 and the groove lower surfaces 17 in the groove portions 14 and 15 are provided on the upper surfaces of the center belts 3a and 3b. The thing in which the convex strip parts 20 and 21 engaged with the concave strip part 18 and the concave strip part 19 provided in the lower surface is formed is mentioned.

  As a means for regulating the movement of the block 2 and the center belts 3a and 3b in the belt width direction, for example, the center is formed on the ridges 20 and 21 formed on at least one of the groove upper surface 16 and the groove lower surface 17 of the block. Concavities and convexities 22 are provided to restrict the movement of the belt and the block in the belt width direction. Specifically, as shown in FIG. 3 and FIG. 4, a protrusion 23 having a cylindrical shape or an elliptical cylindrical shape is provided on the tops of the ridges 20 and 21. When the center belt is attached to the groove portions 14 and 15 of the block by providing the protrusions 23, the protrusions 23 are in a state of biting into the elastomer material constituting the center belt, and the movement between the block and the center belt is strong. It is possible to regulate and prevent wear and heat generation in the block and center belt by suppressing the rocking of the block even when the block receives force from the pulley while the belt is running. is there.

  As shown in FIG. 5 and FIG. 6, a wave-shaped unevenness 22 and a zigzag-shaped unevenness 22 undulating in the belt width direction can be given to the tops of the ridges 20 and 21. By adopting such a configuration, the unevenness 22 of the block 2 is invaded into the elastomer 4 constituting the center belt 3a, 3b, and the movement is strongly restricted between the block 2 and the center belt 3a, 3b. Thus, even when the block 2 receives a force from the pulley while the belt 1 is running, the block 2 is prevented from swinging and skewing, and wear and heat generation in the block 2 and the center belts 3a and 3b. Can be prevented.

  Further, as shown in FIGS. 7 and 8, a cylindrical surface-shaped recess 24 is provided on the front and rear surfaces of the protrusions 20 and 21 in the belt traveling direction, and such a form is also included in the present invention. By adopting such a configuration, the center belt can bite into the recess 24 and the movement between the block and the center belt can be strongly restricted. Further, when the movement of the block and the center belt is restricted by the unevenness provided on the ridges 20 and 21, if the protrusions 20 and 21 are provided with protrusions, it is difficult to fit the center belt depending on the size of the protrusions. And causes heat generation during running of the belt after insertion. However, in the case where the concave and convex portions are provided by providing the concave portions 24 as in the forms of FIGS. 7 and 8, heat generation due to the compression of the elastomer due to the bending of the belt is less, and conversely, the compressed elastomer is concave when the belt is bent. Since it can escape in 24, it leads to suppression of heat_generation | fever. Further, since the concave portions 24 are provided on the front and rear surfaces of the convex strip portions 20 and 21 in the belt traveling direction, there is no unevenness at the top portions of the convex strip portions 20 and 21, so that the influence on the core wires is disturbed. There is also an advantage that traveling can be stabilized.

  As shown in FIG. 9, the projections 23 may be provided only on the end side of the groove upper surface 16 so as to form the irregularities 22. Providing such a protrusion 23 also interferes with the center belt, restricts the movement between the block 2 and the center belt 3, and even if the belt is run, the movement of the center belt in the belt width direction relative to the block and the block are On the other hand, it is possible to suppress the rocking rotating in the front-rear direction and to obtain the effect of reducing the friction between the two.

  In the example provided in FIG. 10 and FIG. 11, protrusions 23 that extend continuously in the longitudinal direction of the belt are provided at three locations on the groove upper surface 16 in the groove portions 14 and 15 of the block 2, including on the ridge portion 20. The protrusion 23 bites into the surfaces of the center belts 3a and 3b, so that the movement of the block 2 and the center belts 3a and 3b in the belt width direction can be restricted. Since the protrusion 23 extends in the belt longitudinal direction, a larger effect can be obtained as an effect of restricting the movement.

  Although not shown in the drawing, a wire or the like is wound around several points on the upper beam of the block so that the groove upper surface 16 including the ridge portion 20 is provided with protrusions so as to be bitten into the center belts 3a and 3b. It can also be used as a means for regulating movement of the center belt in the belt width direction.

  When providing irregularities for the purpose as described above, the height difference D of the irregularities is in the range of 0.05 to 0.3 mm, more preferably in the range of 0.05 to 0.2 mm. Particularly, the convex shape bites into the center belt. It is preferable that the tip is pointed so that it is easy. Further, the number of projections and depressions provided is preferably in the range of 1-10 for the number of protrusions and 1-10 for the number of recesses.

  If the height difference of the unevenness is less than 0.05 mm, the amount of biting into the center belts 3a and 3b is small, the effect of regulating the movement between the block 2 and the center belts 3a and 3b is small, and is larger than 0.3 mm. Then, the effect of restricting the movement of the block 2 and the center belts 3a and 3b is increased, but the thickness of the upper and lower beams cannot be secured sufficiently, and the amount of bending becomes large, causing a problem in the contact between the block and the pulley. This is not preferable because it may lead to noise and transmission efficiency deterioration or damage to the center belt. In addition, if the number of irregularities provided on one ridge exceeds 10 and each irregularity becomes too thin, the irregularities are easily worn or damaged, and the block 2 It becomes impossible to regulate the movement of the center belts 3a and 3b.

  In addition, the block 2 in the present invention may be either a resin material only, or an insert material having a structure in which the surface of an insert material made of a metal such as an aluminum alloy is coated with a resin material. When block 2 without embedded insert is used, it is possible to reduce weight compared to a belt using a block with embedded insert, so that the centrifugal force generated in the belt is small even when used at high speeds. It is suitable for applications with relatively light loads and high rotation, such as motorcycles, but it does not have an insert material, so it has low rigidity, and the upper and lower beams 11 and 12 tend to bend and block. There is a drawback that looseness in fitting between the belt and the center belt is likely to occur, and problems such as wear and heat generation occur between the two.

  The block 2 in which the surface of the insert material is coated with a resin material is not illustrated, but an insert material having substantially the same letter shape as that of the block is used, and at least a location where the blocks contact each other and a location where the block contacts are covered with the resin material. Is. The insert material is an insert material that provides the side pressure resistance and bending rigidity of the block 2, and the materials include aluminum alloys, ceramics, composite materials of ceramics and aluminum, materials such as carbon fiber reinforced resin and iron. Can be mentioned.

In terms of imparting lateral pressure resistance and bending rigidity, a metal material is preferable. Among the metal materials, the elastic modulus of aluminum alloy is 7000 kgf / mm ² and the specific gravity is 2.8, whereas iron has an elastic modulus of 22000 kgf. / Mm ² and a specific gravity of 7.8, and it can be said that iron is stronger in terms of strength. However, for belts that rotate at high speeds, the weight of the belt greatly affects the life of the aluminum, which is advantageous in terms of weight reduction. It is preferable to use an alloy.

  When the resin material is covered and arranged at a predetermined location, an insert material made of a metal material slightly smaller than the size of the block 2 may be used to cover almost the entire surface with the resin material, and the resin material is partially covered and arranged. Compared to the above, problems such as peeling of the resin material are less likely to occur, which is a preferable mode. On the other hand, in terms of reducing the weight of the block 2, it is advantageous to partially cover the resin material.

  The resin material has a relatively large friction coefficient and excellent wear resistance, and has higher rigidity than the elastomer 4 constituting the center belts 3a and 3b, specifically, hard rubber or hard polyurethane having a hardness of 90 ° JIS A or higher. Resin, liquid crystal resin, phenol resin, epoxy resin, polyester resin, acrylic resin, methacrylic resin, polyamide resin, polyamideimide (PAI) resin, polyphenylene sulfide (PPS) resin, polybutylene terephthalate (PBT) resin, polyimide (PI) Rubber or synthetic resin such as resin, polyethersulfone (PES) resin, polyetheretherketone (PEEK) resin is used.

  Among these, considering that the problem of occurrence of cracks in the block 2 is small and that it can be produced by an injection molding method for efficient production, thermoplastic resins, among them, 4,6-nylon, 9T-nylon, 6 Polyamide resin such as 6-nylon and 6-nylon is preferable. In addition, since it has a low coefficient of friction and excellent wear resistance, it is rigid and has elasticity in bending, and a resin that does not easily break is good. However, 4,6-nylon is preferred.

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

  In the present invention, as described above, it is possible to mix a fibrous reinforcing material or a whisker-like reinforcing material in the resin material forming the block, and increase the strength and rigidity of the resin by mixing the fibrous reinforcing material. The blending amount of the fiber reinforcing material in the resin is preferably in the range of 1 to 60% by mass. If it is less than 1% by mass, almost no reinforcing effect is obtained by blending the fibers. If it exceeds 60% by mass, molding becomes difficult and the hardness increases, but the toughness decreases and the impact resistance of the block decreases. Then, it is not preferable because it becomes low.

  Examples of the fibrous reinforcing material to be blended with the synthetic resin include aramid fibers, carbon fibers, glass fibers, polyamide fibers, and polyester fibers. Among them, the resin that constitutes the block described above is a preferable example of using 4,6-nylon and carbon fiber in combination with carbon fiber to improve the water-absorbing defect of 4,6-nylon and greatly improve the rigidity. It is possible to make use of the wear resistance, impact resistance and fatigue resistance of 4,6-nylon.

  By blending a whisker-like reinforcing material in addition to the fibrous reinforcing material, the strength can be improved and the weight can be reduced, and the wear resistance can be improved. Examples of the whisker-like reinforcing material include zinc oxide whisker, potassium titanate whisker, and aluminum borate whisker. Among them, the zinc oxide whisker has a three-dimensional shape in which the hands extend in four directions in a tetrapot shape, and even this alone is excellent in heat resistance and wear resistance. Since it has a three-dimensional shape, blending with a fiber reinforcing material is most preferable because the orientation of the fiber reinforcing material is suppressed and the anisotropy of warping during molding and molding shrinkage is improved. Further, since the orientation of the fiber reinforcement can be reduced in this way, the anisotropy of strength such as the toughness and bending rigidity of the block 2 can be reduced, and the friction coefficient is stabilized, so that the wear resistance is improved. To do. Moreover, since the zinc oxide whisker has a high specific gravity and high rigidity, it is possible to reduce the vibration at the time of contact with the pulley and to expect the effect of reducing the generation of noise.

  The blending amount of the whisker-like reinforcing material is 1 to 30% by mass. If it is less than 1% by mass, the effect of improving the wear resistance is low, which is not preferable. On the other hand, if it exceeds 30% by mass, it is difficult to blend and unfavorable moldability.

  In addition, the lubricity of the block 2 can be improved by mixing at least one selected from molybdenum disulfide, graphite, and fluorine resin. Examples of the fluorine-based resin include polytetrafluoroethylene (PTFE), polyfluorinated ethylene propylene ether (PFPE), tetrafluoroethylene hexafluoropropylene copolymer (PFEP), polyfluorinated alkoxyethylene (PFA), and the like. .

  When a whisker-like reinforcing material is added to the block as described above, wear due to friction with the block pulley can be prevented, but on the other hand, the portion of the center belt in contact with the block is worn by the whisker. There is. Therefore, a thermoplastic resin composition containing no zinc oxide whisker is arranged on the contact surface with the center belt of the block, and a thermoplastic resin composition containing a fiber reinforcing material and zinc oxide whisker on the contact surface with the pulley. Therefore, the wear on the contact surface of the block with the pulley can be prevented, and the center belt can be prevented from being worn.

  In that case, it is not always necessary to configure the entire surface in contact with the center belt of the block with a resin composition containing no whisker, or to configure all the surfaces in contact with the pulley of the block with a resin composition containing whisker. The ratio of the thermoplastic resin composition in the total area of the contact surface with the center belt of the block, and the ratio of the thermoplastic resin composition in the total area of the contact surface with the pulley of the block, By making each 70% or more, the above effect can be obtained.

  In short, the portion in contact with the center belt in the block 2 is basically composed of a thermoplastic resin composition not containing whisker, and the portion in contact with the pulley during belt running is a thermoplastic resin containing fiber reinforcing material and whisker. Although it is composed of a composition, it is allowed to arrange other than 30% of the total area. An example of such a block 2 is given in FIG.

  FIG. 12 shows the form of the block 2 according to claim 12, in which the block main body portion 30 made of a thermoplastic resin composition not containing a whisker-like reinforcing material is connected to the upper and lower beams 11 and 12 at the center. A contact member 32 with a pulley made of a thermoplastic resin composition blended with a whisker-like reinforcing material is inserted into a hole 31 formed at the end of the upper and lower beams 11 and 12 serving as side surfaces of the block. Are arranged. The shape of the block 2 is not necessarily limited to such a shape. In addition, as shown in FIG. 13, the block 2 includes an insert material 2e made of a thermoplastic resin composition not containing a whisker-like reinforcing material and the surface of the insert material 2e. It has a structure covered with a covering material 2f made of a thermoplastic resin composition blended with a reinforcing material. And the part which contacts the center belt 3 in the fitting grooves 14 and 15 does not have the covering material 2f completely, and the form which the insert material 2e is exposed is also mentioned.

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

  As the elastomer 4 of the center belts 3a and 3b, 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 is used. Can be mentioned. And 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 metal thin plate, or the like of the above-mentioned fiber other than a rope embedded in a spiral shape.

  The shape of the belt is not limited to that shown in FIG. 1, and the present invention can be applied to any belt that has an opening on the side surface of the block and easily moves in the belt width direction of the center belt. Although not shown in the figure, for example, a belt having a configuration in which a center belt is fitted into a groove portion opened on one side surface using a substantially U-shaped block, on the groove upper surface and groove lower surface of the groove portion. By providing unevenness that restricts movement in the belt width direction between the block and the center belt on at least one of the provided ridges, the block or center belt can be similarly prevented from swinging or skewing. Wear and heat generation can be prevented. In addition, the shape of the unevenness is not limited to that shown in FIGS. 3, 5, 7, 9, and 10, and a large number of, for example, a plurality of partial spherical protrusions and recesses are uniformly or not provided on the front surface of the protrusion. What is provided in a uniform arrangement, as described above, by winding a wire or the like around several points of the upper beam of the block, a protrusion is provided on the groove upper surface 16 including the protrusion 20 and bites into the center belts 3a and 3b. It is also possible to restrict the movement of the block and the center belt in the belt width direction, or to provide a plurality of protrusions that serve as the belt longitudinal direction and belt width direction regulating means.

  Moreover, in this invention, the fiber member is arrange | positioned to the surface which the block of the center belt 3 contacts at least. As an example of disposing the fiber member, the cover canvas is bonded and laminated on the upper and lower surfaces of the center belt 3, or the short fiber is blended in the elastomer constituting the center belt 3 so that the end of the short fiber is formed on the surface of the center belt. The form of exposing can be mentioned.

  In the example shown in FIG. 2, the center belt 3 is provided with cover canvases 10 on both the upper and lower sides, so that the center belt is protected from friction between the center belt and the block generated during belt running. By adopting such a configuration, wear of the center belt 3 is prevented. As described above, the block 2 of the present invention has projections and depressions on the protrusions in the fitting groove, and the movement of the center belt 3 and the block 2 is regulated by biting into the center belt. The center belt may be worn or deteriorated due to the unevenness of the block inside, but the above-mentioned wear may be caused by covering and covering the upper and lower surfaces of the center belt by bonding the cover canvas 10. Therefore, the center belt can be protected from the occurrence of looseness between the center belt and the block, and failures due to the cutting of the belt can be reduced.

  In addition, when a whisker-like reinforcing material such as zinc oxide whisker is blended in the resin constituting the block, the whisker-like reinforcing material attacks the center belt due to friction between the block and the center belt while the belt is running. Although there is a problem, the problem can also be prevented by the arrangement of the cover canvas.

  Examples of the woven fabric used as the cover canvas 10 include a plain woven fabric, a twill woven fabric, and a satin woven fabric. Examples of the short fibers mixed in the cover canvas 10 and the center belt include aramid fibers, polyamide fibers, and polyester fibers. Can be used. Among them, the one using aramid fibers, specifically, the cover canvas 10 using at least aramid fibers in the longitudinal direction of the belt, can further strengthen the protection of the center belt and extend the life of the belt. it can. The aramid fiber may be either a para aramid fiber or a meta aramid fiber, but it is preferable to use a multifilament yarn obtained by converging an original yarn of 0.3 to 1.2 denier. In addition to the aramid fiber, a yarn in which a polyamide fiber or a urethane elastic yarn is mixed and twisted can be used, but the ratio of the aramid fiber is preferably 20 to 80% of the total weight of the weft yarn. If the thickness of the raw yarn is less than 0.3 denier, the tensile strength of the cover canvas 10 in the longitudinal direction of the belt is lowered and the wear resistance is inferior. Conversely, if the thickness exceeds 1.2 denier, the rigidity of the cover canvas 10 becomes too high after weaving, which may cause the balance between the warp and weft to become unbalanced or cause wrinkles in the canvas. It is not preferable.

  Examples of the para-aramid fiber include Kevlar, Technora and Twaron as trade names, and the meta-aramid fiber includes Nomex and Conex as trade names.

  Further, the warp yarn in the belt width direction may be a filament yarn made of an aramid fiber such as a para-aramid fiber or a meta-aramid fiber in the same manner as the weft, and other 6-nylon, 6,6-nylon, 12-nylon, etc. Filament yarns such as polyamide fiber, polyvinyl alcohol fiber, and polyester fiber can be used.

  Adhesion treatment is performed in order to laminate and bond the cover canvas 10 having such a configuration to the surface of the center belt. Examples of the adhesion treatment include treatment with an RFL solution, an isocyanate solution, or an epoxy solution. The RFL solution is a mixture of an initial condensate of resorcin and formalin mixed with latex. Examples of latex used here include styrene / butadiene / pyridine terpolymers, hydrogenated nitrile rubber, chlorosulfonated polyethylene, epichlorohydrin, and the like. The latex. Further, a pasting process in which a rubber paste dissolved in a solvent is attached to the surface of the cover canvas 10 can also be cited as an adhesive process.

  In these adhesion treatments, the friction coefficient between the block and the center belt cover canvas can be lowered by blending a friction coefficient reducing material with an adhesion treatment agent such as an RFL solution, an isocyanate solution, an epoxy solution, or rubber glue. Further, it is possible to prevent wear due to friction between the block containing the whisker such as zinc oxide and the center belt. Specific examples of the friction coefficient reducing material include polytetrafluoroethylene, polytrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkoxyethylene copolymer, tetrafluoroethylene-ethylene copolymer. Fluorine resin such as polymer, ceramic powder, glass beads, ultra high molecular weight polyethylene, graphite, molybdenum disulfide, phenol resin, glass fiber, carbon fiber, aramid fiber, etc., at least one of these, Preferably, ceramic powder, glass beads, ultrahigh molecular weight polyethylene, graphite, molybdenum disulfide, polytetrafluoroethylene and other fluororesins, and at least one of phenolic resins, more preferably polytetrafluoroethylene. It is preferable to use a fluorocarbon resin such as La fluoroethylene.

  Further, the center belt 3 is provided with concave and convex portions 18, 19 and the like at predetermined pitches on both upper and lower surfaces to form a concavo-convex shape so as to mesh with the block 2. In the present invention, the cover canvas 10 may have a width after adhesion treatment of 55 to 70%, more preferably 58 to 65% of the width before adhesion treatment. The canvas used as the cover canvas originally uses a canvas having elasticity, but shrinks by performing an adhesion process. The greater the shrinkage, the thicker the canvas, and vice versa. In particular, when an aramid fiber is used as the cover canvas 10, the rigidity is higher than other fibers, and even when forming the protruding portion of the center belt, it is difficult to follow the shape of the mold due to its rigidity, and the height and shape of the uneven shape is difficult. Is difficult to form as designed. Therefore, as described above, the width of the cover canvas 10 after the bonding process is set to 55 to 70% of the width before the bonding process, so that the thickness of the canvas is adjusted, and the shape of the mold that forms the uneven shape is met. I was able to do it. If this value is less than 55%, the shrinkage will be large and the canvas will be thick, so it will not be possible to follow the mold during vulcanization, and the height and shape of the uneven shape of the center belt will be difficult to form as designed, exceeding 70% Since the stretchability of the canvas becomes poor, the height and shape of the uneven shape of the center belt are similarly difficult to be formed as designed. By setting the content in the range of 55 to 70%, more preferably 58 to 65%, a canvas having both stretchability and ease of alignment can be obtained.

  Further, protective layers may be disposed on the upper and lower surfaces of the center belt 3. A cover canvas as described above is disposed on the surface of the center belt 3 to protect the center belt 3. However, by providing a protective layer, the center belt 3 can be more firmly protected from friction between the center belt and the block generated during belt running. The belt can be protected. By adopting such a configuration, wear of the center belt 3 is prevented, so that failure due to cutting of the belt can be reduced.

  Examples of the protective layer include polyisocyanate resin, urethane resin, epoxy resin, melamine resin, unsaturated polyester resin, silicone resin, fluorine resin, etc., which are excellent in wear resistance and heat resistance. Therefore, it is preferable to use a thermosetting resin. From the viewpoint of easy adhesion to the center belt 3, it is preferable to use a polyisocyanate resin or a urethane resin because a liquid material can be cured. In addition to the resin material, a metal plating layer can be used as the protective layer 40. Specifically, the surface of the center belt 3 can be electrolessly nickel-plated, and the protective layer can be easily immersed in a plating solution. Can be formed. It is also possible to contain the fluororesin particles in the metal plating layer, and the sliding between the block and the wear can be prevented.

  Fluorine resin to be included in the metal plating layer includes tetrafluoroethylene resin (PTFE), tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin (PFA), and tetrafluoroethylene / hexafluoropropylene copolymer resin. (PFEP), tetrafluoroethylene / ethylene copolymer resin (PETFE), vinylidene fluoride resin (PVDF), vinyl fluoride resin (PVF), chlorotrifluoroethylene resin (CTFE), ethylene / chlorotrifluoroethylene resin (ECTFE), ethylene / tetrafluoroethylene copolymer resin (PETFE), and the like. Among fluororesins, it is preferable to use tetrafluoroethylene resin (PTFE) from the viewpoint of suppressing wear resistance and heat generation.

  Further, the thickness of the protective layer is preferably set in the range of 1 to 100 μm, more preferably 10 to 50 μm. If it is less than 1 μm, it will be easily worn and peeled off by friction with the block and the protective effect will be thin, and if it exceeds 100 μm, it will be too thick and poor in flexibility.

  The method of providing the protective layer on the center belt 3 is not limited, but in the case of a thermosetting resin or the like, the center belt 3 is immersed in an uncrosslinked liquid resin and adhered to the entire surface to be crosslinked and cured. The method can be taken. The thickness of the resin layer to be adhered can be adjusted by the viscosity of the resin when immersed, but in some cases, the necessary thickness can be ensured by immersing the resin layer a plurality of times.

  In the example shown in FIG. 2, the protective layer is provided on the surface of the elastomer 4. However, a structure in which a cover canvas is laminated on the elastomer 4 and a protective layer is further provided on the cover canvas is similarly applied to the present invention. Can achieve the intended effect.

  A high load transmission belt as an example of the present invention and a high load transmission belt as a comparative example deviating from the present invention were produced and run under the conditions shown in Table 1 to perform a durability test.

Example 1
The high load transmission belt used in Example 1 is a belt as shown in FIG. 1, and the upper beam has zigzag irregularities as shown in FIGS. 5 and 6 in the grooves opened on both sides of the block. It was formed on the upper surface of the groove on the side, and uniform irregularities with a height difference of 0.15 mm were provided on all four convex strips. As resin used for a block, what blended 30 mass% of carbon fiber to 4, 6 nylon was used. As the center belt, an aramid fiber was used for the core wire, and a hydrogenated nitrile rubber was used for the elastomer, and a cover canvas using an aramid fiber for the weft in the longitudinal direction of the belt was used on the surface. The specifications of the belt and the results of the durability test are shown in Table 1, and the running conditions are shown in Table 2.

(Example 2)
The high load transmission belt used in Example 2 uses a belt as shown in FIG. 1, and a convex strip as shown in FIGS. Concavities and convexities were formed in the form of providing concave portions on the front and rear surfaces, and uniform concave and convex portions having a height difference of 0.15 mm were provided on all four convex strips. As resin used for a block, what blended 30 mass% of carbon fiber to 4, 6 nylon was used. As the center belt, an aramid fiber was used for the core wire, and a hydrogenated nitrile rubber was used for the elastomer, and a cover canvas using an aramid fiber for the weft in the longitudinal direction of the belt was used on the surface. The specifications of the belt and the results of the durability test are shown in Table 1, and the running conditions are shown in Table 2.

(Example 3)
In Example 3, a belt similar to that in Example 1 was used except that a center canvas provided with a cover canvas made of nylon fiber was used. The traveling conditions were as shown in Table 1. The specifications of the belt and the results of the durability test are shown in Table 1, and the running conditions are shown in Table 2.

(Comparative Example 1)
In Comparative Example 1, the same belt as in Example 1 was used except that the convex and concave portions were not provided with irregularities. The specifications of the belt and the results of the durability test are shown in Table 1, and the running conditions are shown in Table 2.

(Comparative Example 2)
In Comparative Example 3, the same belt as in Example 3 was used except that the protrusions were not provided with irregularities. The specifications of the belt and the results of the durability test are shown in Table 1, and the running conditions are shown in Table 2.

  As can be seen from the results of Table 1, in Examples 1 and 2 in which the protrusions on the upper surface of the groove in the groove of the block are provided with irregularities, the belt does not generate the above even if it is run for 500 hours. In 1, the lower beam of the block was broken in 231 hours, leading to a failure. This is thought to be due to movement caused by looseness of the fitting between the block and the center belt, leading to breakage of the block. Further, in Example 3, the center belt was cut in 280 hours, and the block was uneven, which was superior to Comparative Example 1. However, nylon was used as the cover canvas. Thus, it can be seen that the center belt is cut early compared to Examples 1 and 2.

(Examples 4 to 9)
Next, the state of wear of the center belt by adding zinc oxide whisker to the resin constituting the block was confirmed by referring to Examples and Comparative Examples of the present invention. A high-load transmission belt is manufactured as shown in Table 3, and a belt running test is performed, and the state of the cover canvas on the center belt surface after running and the looseness of the fit between the block and the center belt are observed. Then, the wear amount (upper width change) of the block was measured.

  Note that the shape of the block of the high load transmission belt used is such that a block having irregularities as shown in FIG. 3 is used on the convex portion on the upper surface of the groove. Table 3 shows the configuration of the cover canvas on the surface of the center belt. The load was changed to the high load transmission belts of Examples 4 to 9.

  The resin used for the block was composed of 4,6-nylon, carbon fiber and zinc oxide whisker, and the blend was 30% by mass of carbon fiber and 10% by mass of zinc oxide whisker. In addition, about Example 7 and Example 9, the zinc oxide whisker was not mix | blended. The belt specifications and durability test results are shown in Table 3, and the running conditions are shown in Table 4.

  The amount of wear (width change) of the block was measured with a projector by removing the block from the belt after running.

  As can be seen from Table 3, in Examples 4 to 7 where aramid fibers were used for the weft as the cover canvas, the cover canvas had no abnormality or small cracks even after running for 500 hours. In contrast, in Example 8 in which the block contained zinc oxide whisker and the cover canvas was made of nylon canvas that did not contain aramid fibers, a large crack occurred in the cover canvas during 200 hours of travel, and the belt was cut.

  In Example 9, a nylon canvas is used as the cover canvas, and the cover canvas does not contain zinc oxide whisker in the resin constituting the block. It was cut. Further, since no whisker was blended in the block, the wear was as large as 0.5 mm, and the fitting between the block and the center belt was also greatly loosened.

  Compared to Examples 4 and 5, in Example 6, there is a difference that the aramid fiber used for the weft of the cover canvas is a meta system compared to the para system, but in Example 6, a small crack occurs in the cover canvas after running for 500 hours. It was found that even for the same aramid fiber, it is preferable to use a para-aramid fiber rather than a meta-aramid fiber. Furthermore, in Example 7, no whisker was added to the block, and the amount of wear of the block increased.

  Next, a comparative test was performed on a belt provided with a protective layer on the surface of the center belt and a belt not provided with the protective layer.

(Example 10)
Example 10 is a high load transmission belt as shown in FIG. 1, and 4,6-nylon containing 30% by mass of carbon fiber and 10% by mass of zinc oxide whisker was used as the resin material used for the block. . As the center belt, an aramid fiber was used for the core 5 and a chloroprene rubber was used for the elastomer 4, and a cover canvas made of an aramid fiber was provided on the surface. The belt size was a belt pitch width of 18 mm, a pitch circumference of 690 mm, and a block pitch of 3 mm. Projections as shown in FIG. 3 are provided on the ridges on the upper surface of the block grooves. The process of immersing and curing the center belt in a liquid urethane resin was repeated three times to form a protective layer having a thickness of about 30 μm. Table 5 shows the belt specifications and the results of the durability test, and Table 6 shows the running conditions.

(Example 11)
As Example 11, a protective layer provided on the surface of the center belt was made of polytetrafluoroethylene (PTFE), and a belt was produced under the same conditions as Example 10 except that adhesion by plating was performed. Table 5 shows the belt specifications and the results of the durability test, and Table 6 shows the running conditions.

(Example 12)
As Example 12, a belt was produced under exactly the same conditions as Example 10 except that the protective layer was not provided on the surface of the center belt. Table 5 shows the belt specifications and the results of the durability test, and Table 6 shows the running conditions.

  From the results of Table 5, although the belt of Example 12 without a protective layer was running for 500 hours, the block and the center belt were loosened due to wear of the center belt, whereas Example 10, 11 shows that the belt can continue to run without any abnormality even after 500 hours have elapsed, and the center belt is protected by the protective layer, and the life can be extended.

(Examples 13 to 16)
Next, a high load transmission belt according to the present invention was manufactured in the configuration shown in Table 7, a belt running test was performed, the occurrence of cracks in the block was observed, and the amount of wear on the side of the block was measured. The looseness between the belt and the belt was observed.

  In addition, the block of the high load transmission belt used is a block using a block having irregularities as shown in FIG. 3 on the convex portion of the groove upper surface, and using a block as shown in FIG. The material of the insert material and the covering material was changed as shown in Table 1 to obtain high load transmission belts of Examples 10-13. In Example 15 and Example 16, the insert material was not covered with a covering material, but a block made of one kind of resin was used.

  The center belts 3a and 3b used are all common, the core 5 is made of aramid fibers, the elastomer 4 is made of chloroprene rubber, and the surface is provided with a cover canvas using aramid fibers as wefts in the longitudinal direction of the belt. It was used. The belt sizes of Example 13, Example 15, and Example 16 were 18 mm, the pitch circumference was 831 mm, and the block pitch was 3 mm. In Example 14, only the belt pitch width was 25 mm, the pitch circumference was 690 mm, and the block pitch was 3 mm. It was.

  As a thermoplastic resin composition A that does not contain whiskers, 4,6 nylon and 30% by mass of carbon fiber short fibers were used. A mixture of whiskers was used as thermoplastic resin composition B, and 4,6-nylon was blended with 30% by mass of carbon fiber short fibers, and further with 10% by mass of zinc oxide whisker. As the thermosetting resin composition, a mixture of 50% by mass of PAN-based carbon fiber and 15% by mass of graphite with respect to diallyl phthalate resin was used.

  The amount of wear on the side of the block was measured with a projector by removing the block from the belt after running. The belt specifications and durability test results are shown in Table 7, and the running conditions are shown in Table 8.

  As can be seen from Table 7, the examples 13 to 16 traveled for 500 hours. In Example 13, there was no abnormality such as cracking of the block, the amount of wear was small, and the block and the center belt were fitted together. Looseness did not occur. The thermoplastic resin composition A not containing zinc oxide whisker and the thermoplastic resin composition B containing zinc oxide whisker are used separately for the insert material and the covering material, and the thermoplastic resin composition is used at the contact point with the center belt. The effect which has arrange | positioned the thermoplastic resin composition B in the contact site | part with the thing A and a pulley is recognized.

  In Example 14, although the wear of the block is small, looseness is generated between the block and the center belt, which is considered to be because the weight of the belt is large and a large centrifugal force is applied to the center belt.

  In Example 15, it was made of a resin not containing any whisker, and the block was worn and the fitting between the block and the center belt was slightly loosened.

  Example 16 is made of resin containing all whisker, so the amount of wear of the block is small, but when the block is observed, cracks occur in some places and the center belt is worn and a little looseness occurs. did. This will eventually lead to problems such as cutting the center belt.

  From the above results, the thermoplastic resin composition A containing whisker and the thermoplastic resin composition B containing no whisker as in the present invention are properly used for the insert material and the covering material, and the contact portion with the center belt. A high load transmission belt with less problems such as center belt and block wear due to friction with the block by disposing the thermoplastic resin composition A and the thermoplastic resin composition B at the contact portion with the pulley; I found out that

  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 principal part perspective view of the high load power transmission belt of this invention. It is a side view of the high load power transmission belt of the present invention. It is a block front view used for this invention. It is the top view of the place which looked at the protruding item | line part from the top in the belt of FIG. It is a block front view used for this invention. FIG. 6 is a plan view of a ridge portion viewed from above in the belt of FIG. 5. It is a block front view used for this invention. It is the top view of the place which looked at the protruding item | line part from the top in the belt of FIG. It is a block front view used for this invention. It is a block front view used for this invention. It is a side view of the upper beam in the belt of FIG. It is a block front view used for this invention. It is a block front view used for this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Block 2a Side surface 2b Side surface 3a Center belt 3b Center belt 4 Elastomer 5 Core body 6 Upper surface 7 Lower surface 10 Cover canvas 11 Upper beam portion 12 Lower beam portion 13 Center pillar 14 Fitting groove 15 Fitting groove 16 Groove Upper surface 17 Groove lower surface 18 Concave portion 19 Convex portion 20 Convex portion 21 Convex portion 22 Convex portion 23 Protrusion 24 Concavity

Claims (23)

A center belt buried core in the elastomer, connects the upper beam and the lower beam by pillars, consists of a block having a groove surrounded by the upper and lower beams and pillars for mounting a center belt, in said groove Is a high-load transmission belt in which a regulating means for regulating movement in the belt longitudinal direction and belt width direction is provided between the block and the center belt, and at least a fiber member is present at a position in contact with the block on the center belt surface In the above, the means for restricting the movement in the longitudinal direction of the belt is such that the belt-width-direction ridges provided on the groove upper surface and the groove lower surface in the block groove portion and the belt-width direction groove portions provided on the center belt are fitted together. the a configuration, further, means for restricting the movement of the belt width direction, a groove top surface or groove bottom in a groove of the block Irregularities on at least one of the convex portion provided in a configuration in which bite into the irregular center belt, heavy duty power transmission belt, characterized in that. It means for restricting the movement of the belt width direction, from at least one of the top of the convex portion provided on the groove top and the groove bottom surface of the groove of the block, formed by providing one or more protrusions projecting of claim 1 High load transmission belt 2. The height according to claim 1 , wherein the means for regulating the movement in the belt width direction is provided with a recess on the front and back surfaces of at least one of the protrusions provided on the groove upper surface and the groove lower surface in the groove portion of the block. Load transmission belt. 2. The high load transmission according to claim 1 , wherein the means for regulating the movement in the belt width direction is provided with zigzag-like irregularities on at least one of the tops of the groove upper surface and the groove lower surface in the groove of the block. belt. 2. The high load transmission belt according to claim 1 , wherein the means for regulating movement in the belt width direction is provided with a convex portion on the side end side of the block of the convex strip portion provided on the groove upper surface and the groove lower surface in the groove portion of the block. 2. The high load transmission according to claim 1 , wherein the means for regulating the movement in the belt width direction is provided with a protrusion continuously extending in the belt longitudinal direction on at least one of the groove upper surface and the groove lower surface in the groove portion of the block. belt. The high load transmission belt according to any one of claims 1 to 6 , wherein a difference in height of the unevenness is 0.05 to 0.3 mm. The high load transmission belt according to any one of claims 1 to 7 , wherein the fiber member is a cover canvas coated on a surface of the center belt. The high load transmission belt according to any one of claims 1 to 7 , wherein the fiber member is a short fiber embedded in an elastomer forming a center belt. The high load transmission belt according to any one of claims 1 to 9, wherein no insert material is embedded in the block. The high according to any one of claims 1 to 10, wherein the block includes a thermoplastic resin and a fibrous reinforcing material as main components, and the fibrous reinforcing material is blended at a ratio of 1 to 60 mass%. Load transmission belt. The high load transmission belt according to claim 11, wherein the thermoplastic resin is any one of 4,6-nylon, 9T-nylon, polyphenylene sulfide, polyether ether ketone, polyether sulfone, and polyamideimide. The high-load transmission belt according to claim 11 or 12 , wherein the fibrous reinforcing material is carbon fiber alone or a combination of carbon fiber and aramid fiber. The high load power transmission belt according to any one of claims 11 to 13, wherein a whisker-like reinforcing material is blended in the block at a ratio of 1 to 30% by mass. The high load transmission belt according to claim 14 , wherein the whisker-like reinforcing material is zinc oxide whisker. A thermoplastic resin composition containing no whisker-like reinforcing material is arranged on the contact surface with the center belt of the block, and a thermoplastic resin containing a fibrous reinforcing material and a whisker-like reinforcing material is arranged on the contact surface with the pulley. The proportion of the thermoplastic resin composition not containing the whisker-like reinforcing material in the total area of the contact surface with the center belt of the block, and the total contact surface with the block pulley The high load transmission belt according to claim 14 or 15 , wherein a ratio of the thermoplastic resin composition containing the whisker-like reinforcing material in the area is 70% or more. The high-load transmission belt according to any one of claims 1 to 16, wherein the cover canvas on the surface of the center belt is subjected to adhesion treatment, and a friction coefficient reducing material is blended in the adhesion treatment agent. The high-load power transmission belt according to any one of claims 1 to 17, wherein the cover canvas has a width after shrinking by an adhesion treatment of 55 to 70% before the adhesion treatment. In the high-load transmission belt in which a center belt and a plurality of blocks are provided along the longitudinal direction of the center belt, the center belt has a thickness of 1 to at least a surface of a portion that embeds a core body in an elastomer and contacts the block. The high load transmission belt according to any one of claims 1 to 18, which has a protective layer of 100 µm. The high load transmission belt according to claim 19, wherein the protective layer is made of urethane resin. The high load transmission belt according to claim 19 , wherein the protective layer is a metal plating layer. The high load transmission belt according to claim 21, wherein the metal plating layer contains a fluororesin. The high-load transmission belt according to any one of claims 1 to 22, wherein the cover canvas on the upper and lower surfaces of the center belt is a canvas in which at least wefts in the longitudinal direction of the belt are aramid fibers.

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