JP2008180379A - High-load transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tension transmitting type high-load transmission belt having sufficient strength and also satisfying a condition required as the high-load transmission belt at a high level, even if weight of blocks is reduced and the belt is rotated at a high speed, and the blocks used for the high-load transmission belt. <P>SOLUTION: This high load transmission belt 1 is composed of center belts 3a and 3b and a plurality of blocks 2 arranged at a predetermined pitch along the longitudinal direction of the center belts 3a and 3b. The belt uses the blocks 2 formed in such a manner that resin as covering material 2b is arranged on the surface of insertion material 2a consisting of a resin composition prepared by molding organic fibers and inorganic fibers with a binder resin. <P>COPYRIGHT: (C)2008,JPO&INPIT

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 a center belt, and the 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.

  As the required quality of the block of such a tension transmission type high load transmission belt, because it is intended for high load transmission in friction transmission as described above, 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.

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

  Patent Document 3 discloses a technique of using an aluminum alloy containing a small amount of copper, magnesium, and zinc as an insert material used for a block.

Japanese Patent Laid-Open No. 63-34342 JP 2001-31453 A JP 2003-74643 A

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

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

  Certainly, from the viewpoint of weight reduction, it is advantageous that all are made of a resin composition. However, there are disadvantages in terms of the strength of the block and the dimensional stability, and there is a problem that it is difficult to use in applications where a large load is applied.

  In Patent Document 3, although other metals are added as an insert material, most of the alloy is an aluminum alloy, which is substantially the same as an insert using aluminum and hardly changes in weight. The problem of increased centrifugal tension has not been resolved.

  The present invention has been made in view of the above problems. Even when the block weight is reduced and the block is rotated at a high speed, the present invention has sufficient strength and has less problems such as block wear even in a high temperature environment. Another object of the present invention is to provide a tension transmission type high load transmission belt and a block thereof that can satisfy the requirements of a high load transmission belt at a high level.

  In order to solve the above problems, the high load transmission belt according to claim 1 of the present invention is a high load transmission belt comprising a center belt and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt. It is characterized by using a block in which a covering material is provided on the surface of an insert material made of a resin composition obtained by molding organic fibers and inorganic fibers with a binder resin.

  In Claim 2, it is set as the high load power transmission belt of Claim 1 formed by 10-70 mass% of organic fibers, 1-80 mass% of inorganic fibers, and 10-85 mass% of binder resin in insert material. .

  In Claim 3, it is set as the high load power transmission belt of Claims 1-2 whose organic fiber is a pulp.

  In Claim 4, the binder resin is a phenol resin, an epoxy resin, or a diallyl phthalate resin.

  The coating material according to claim 5, wherein the coating material is a resin composition obtained by blending 1 to 30% by mass of zinc oxide whisker and 1 to 60% by mass of a fibrous reinforcing material with respect to the thermoplastic resin. High load transmission belt.

  In Claim 6, it is set as the high load power transmission belt of Claims 1-5 whose coating | covering material is a composition of a polyamide resin.

  According to claim 1, since the resin composition obtained by molding organic fibers and inorganic fibers with a binder resin is used as the insert material, the belt is significantly lighter than conventional insert materials made of an aluminum alloy. The centrifugal tension at the time of traveling is small and it can be applied to high-speed rotation. Further, since the surface is coated with a resin, it is possible to run the belt in a dry type without supplying lubricating oil.

  In Claim 2, the compounding composition of the resin composition used as an insert material is limited, and it can be excellent in heat resistance, shape retention, and strength.

  In claim 3, pulp is used as the organic fiber to be blended in the resin composition constituting the insert material, and it can be molded into a complicated shape and is excellent in strength.

  In Claim 4, since the kind of binder resin is limited to phenol resin, epoxy resin, and diallyl phthalate resin, it is excellent in heat resistance and strength at high temperatures, generates less flammable gas, and has a juvenile suppression effect. preferable. Examples of phenolic resins include novolac phenolic resins, resol type phenolic resins, modified phenolic resins modified with urea resins, melamine resins, epoxy resins, and the like.

  In claim 5, a resin composition in which zinc oxide whisker and a fiber reinforcing material are blended with a thermoplastic resin as a covering material is used, and in claim 6, a polyamide resin composition is used, and the strength, wear resistance, toughness, etc. of the block are used. With respect to the physical properties of the belt, the belt is set so as to have the most suitable balance for use as a belt, and the belt can be excellent in transmission efficiency and durability.

  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 side sectional view thereof. The high load transmission belt 1 of the present invention includes two center belts 3a and 3b having the same width formed by embedding a rope-like core body 5 in a spiral shape in an elastomer 4, and upper and lower surfaces of the center belts 3a and 3b. 6 and 7 is formed of a plurality of blocks 2 which are fitted and engaged with concave ridges 18 and 19 formed at a predetermined pitch. Both side surfaces 8 and 9 of the block 2 are inclined surfaces that engage with the V-grooves of the pulleys, and receive the power from the driven pulleys, and the center belts 3a and 3b that are locked and fixed. The power of the driving pulley is transmitted to the driven pulley.

  As shown in FIG. 1, the shape of the block 2 includes an upper beam portion 11 and a lower beam portion 12, and a center pillar 13 that connects the central portions of the upper and lower beam portions 11 and 12. Are formed with grooves 14 and 15 into which the center belts 3a and 3b are fitted. Further, on the groove upper surface 16 and the groove lower surface 17 in the groove 15, convex ridges 20, 21 that engage with a concave ridge 18 provided on the upper surface 6 of the center belt 3 a, 3 b and a concave ridge 19 provided on the lower surface 7. Is provided.

  FIG. 2 shows an example of another belt. A pair of side pillars 32 and 33 extend upward from both ends of the beam portion 31, and the upper ends of the side pillars 32 and 33 respectively extend toward the center of the block 2. The extending lock portions 34 and 35 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 are fitted. The center belts 3a and 3b are inserted into the fitting groove 30 through the opening between the lock portions 34 and 35 and attached.

  Further, a convex portion 37 is provided on each of the lock portions 34 and 35 on the fitting groove 30 side, and this convex portion 37 is fitted into the concave portion 36 provided at a predetermined pitch on the center belts 3a and 3b. To do. As a result, the center belts 3a and 3b are not easily removed from the block 2 after being mounted.

  In the present invention, the block 2 has a structure in which the surface of the insert material 2a is covered with a coating material 2b made of resin as shown in FIGS. FIG. 3 shows a block 2 used in the belt shown in FIG. 1, in which the entire surface of the insert material 2a is covered with a coating material 2b and is completely embedded. FIG. 4 shows a block 2 used in the belt shown in FIG. 2, and the covering material 2b does not cover the entire surface of the insert material 2a, and the insert material 2a is partially exposed.

  The insert material 2a usually has a substantially block shape by itself, and is a portion that bears the main part of the physical properties of the block. The covering material 2b has a thickness of about 0.1 to 0.5 mm, for example, and a belt It covers the surface of the insert material 2a at a portion that contacts the pulley when traveling and a portion where adjacent blocks contact each other. The covering material 2b may cover only the portion where the friction is generated as described above, but may cover the entire surface of the insert material 2a.

  In the present invention, the insert material 2a is made of a resin composition obtained by molding organic fibers and inorganic fibers with a binder resin, has high heat resistance and is excellent in strength, and has sufficient block strength. In addition, the weight of the belt can be reduced and the weight of the entire belt can be reduced. Since the burden on the belt can be reduced, the life of the belt can be greatly extended.

  Examples of organic fibers include paper fibers and fibrillated synthetic fibers. Paper fiber is pulp, and wood pulp, cotton pulp, linter pulp, and non-wood pulp can also be used. Waste paper pulp can also be used. Examples of synthetic fibers include aramid fibers, polyamide fibers, and polyester fibers. The fiber length of the organic fiber is preferably in the range of 0.8 to 2.0 mm. If the thickness is less than 0.8 mm, the reinforcing effect is small, and if it exceeds 2.0 mm, the workability deteriorates. Moreover, the content of the organic fiber is preferably 10 to 70% by mass, more preferably 20 to 50% by mass. If it is less than 10% by mass, a sufficient reinforcing effect cannot be obtained, and if it exceeds 70% by mass, the workability deteriorates, which is not preferable.

  Examples of the inorganic fiber include carbon fiber, mineral fiber, ceramic fiber, etc. Among them, it is preferable to use carbon fiber having high strength and high heat resistance. The fiber length of the inorganic fiber is preferably in the range of 0.2 to 10 mm, and if it is less than 0.2 mm, the reinforcing effect is small, and if it exceeds 10 mm, the workability is deteriorated. Moreover, the compounding quantity has the preferable range of 10-90 mass%. If it is less than 10% by mass, a sufficient reinforcing effect cannot be obtained, and if it exceeds 90% by mass, workability is deteriorated and molding of the insert material becomes difficult.

  Examples of the binder resin include thermosetting resins such as phenol resins, epoxy resins, and furan resins. And among these, it is preferable to use the phenol resin which is excellent in terms of impact resistance and heat resistance.

As it can be used for other as the binder, there can be mentioned colloidal silica, obsidian, mullite, perlite, ethyl silicate, a compound mainly comprising SiO _2, such as water glass.

  In consideration of ensuring the strength of the insert material and considering the ease of molding, the amount of the binder resin is preferably in the range of 10 to 85 mass%, more preferably 20 to 80 mass%.

  By using the above materials, it is possible to reduce the weight significantly without impairing the strength of the block. In addition, the material is excellent in vibration energy absorption characteristics, and the effect of reducing the noise of the belt can be obtained. Even if the impact is repeatedly applied from the pulley during the running of the belt, the material is not easily broken. In addition, it is possible to provide stable traveling with little change in dimensions even with respect to temperature changes such as high temperature during traveling and low temperature during stopping.

  The resin used as the covering material 2b may be a thermosetting resin or a thermoplastic resin. When a thermosetting resin is used as the coating material 2b, examples of the resin include phenol resin, epoxy resin, urea resin, melamine resin, unsaturated polyester resin, diallyl phthalate resin, alkyd resin, and acrylic resin. Of these, the use of a phenol resin is advantageous in terms of physical properties such as bending strength and cost. Further, since diallyl phthalate resin is excellent in heat resistance, it can exhibit higher durability in a high temperature environment such as in an engine room of an automobile. Furthermore, diallyl phthalate resin itself is a resin with little molding shrinkage, and the amount of shrinkage after block molding is small and more accurate dimensions and angle of the side of the block can be obtained, leading to reduction of noise during belt running and further life extension. be able to.

  Moreover, it is possible to mix | blend a fiber as a reinforcing material with the thermosetting resin which comprises this coating | covering material 2b, and as a fiber, carbon fiber, polyamide fiber, a cellulose, cotton, an aramid fiber, polyparaphenylene benzobisoxazole Examples thereof include long fibers and short fibers such as fibers, polyarylate fibers, glass fibers, and metal fibers. The blending amount is preferably in the range of 15 to 110% by mass, and if it is less than 15% by mass, almost no reinforcing effect is obtained by blending the fibers, and if it exceeds 110% by mass, molding becomes difficult. At the same time, the hardness increases, but the toughness decreases and the impact resistance of the block decreases, which is not preferable.

  When a thermoplastic resin is used as the covering material 2b, examples of the resin include polyamide resins such as nylon 46, nylon 6, nylon 66, nylon 6T, nylon 9T, other polyphenylene sulfide, polyether ether ketone, and the like. , These fibers are blended with fiber reinforcing materials consisting of carbon fiber, polyamide fiber, cellulose, cotton, aramid fiber, polyparaphenylene benzobisoxazole fiber, polyarylate fiber, glass fiber, metal fiber, etc. It is a composition. Among these fiber reinforcing materials, it is preferable to use carbon fiber because it has the effect of reinforcing the strength of the resin and lowering the friction coefficient.

  Also in the case of a thermoplastic resin, the strength and rigidity of the resin can be increased by blending the fiber reinforcing material, and 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 can be 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.

  In addition, the zinc oxide whisker can greatly improve the wear resistance by being blended with the thermoplastic resin, and the effect of preventing the wear of the covering material 2b that keeps sliding with the pulley can be obtained. Zinc oxide whiskers have a three-dimensional shape that extends in four directions in a tetrapot shape, and even if this alone is excellent in heat resistance and wear resistance, the tetrapot-shaped three-dimensional shape as described above. Because of its shape, when blended with a fiber reinforcing material, 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 zinc oxide whisker with respect to the thermoplastic resin is blended in the range of 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.

  As described above, the insert material 2a is formed by using organic fibers and inorganic fibers molded with a binder resin, and the surface thereof is coated with the resin as the coating material 2b. The insert material is made of a conventional metal material such as aluminum. Since it can be made lighter than the material embedded, the centrifugal tension can be kept low even when used at high speed.

  In addition to the fiber reinforcement and the zinc oxide whisker, 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. .

  Moreover, it is also possible to mix | blend whiskers, such as potassium titanate and an aluminum borate, with respect to a thermosetting resin other than a fibrous reinforcement. Since the zinc oxide whisker has a high specific gravity and a high rigidity, it can reduce vibration when contacting with the pulley, and can reduce the generation of noise.

  In addition, by providing protrusions T on the surfaces of the ridges 20 and 21 of the block 2 so as to bite into the surfaces of the center belts 3a0 and 3b, it is possible to prevent loosening between the block and the center belt. The life of the belt can be extended. The protrusions T may be provided on both the upper and lower ridges 20 and 21, or may be provided on only one of them.

  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. 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 wire 5 may be made of a woven fabric, knitted fabric, metal thin plate, or the like of the above-mentioned fiber other than a rope embedded in a spiral shape.

  Next, a high load transmission belt according to the present invention was manufactured as shown in Table 1, a belt running test was performed, the occurrence of block cracking was observed, and the amount of wear on the side surface of the block was measured.

(Example 1)
The high load transmission belt used is a block as shown in FIG. 1, and the material of the insert material of the block is changed as shown in Table 1, and the high load transmission of the example and the comparative example is used. A belt.

  The material used as the insert material is 30% by mass as the organic fiber, 10% by mass of the carbon fiber as the inorganic fiber, and 70% by mass of the phenolic resin as the binder resin and molded into the shape of the insert material, The insert material was set in a mold, and insert molding was performed to form a coating material on the surface. As the coating material, nylon 46 (Stanyl manufactured by DJEP), which is a thermoplastic resin, and 30 parts by mass of PAN-based carbon fiber were blended.

  As the center belt, an aramid fiber was used for the core wire 5 and chloroprene rubber was used for the elastomer 4. The belt size was a belt pitch width of 18 mm, a pitch circumferential length of 831 mm, and a block pitch of 3 mm.

  A block was attached to the center belt to obtain a high load transmission belt, and the belt was run under the running conditions shown in Table 1, and the time until the end of the life was measured. The results are shown in Table 2.

(Example 2)
As Example 2, a belt was created under exactly the same conditions as Example 1, except that a block having protrusions T provided on the surface of the ridge as shown in FIG. 5 was used. The belt was run under the running conditions as shown in Table 1, and the time until the end of the life was measured. The results are shown in Table 2.

(Comparative example)
As a comparative example, except that an insert material made of an aluminum alloy was used as the insert material, a block of the same size and the same material and configuration as in the example was created, and mounted on the same center belt as in the example, and high load transmission was performed. A belt. The belt was run under the running conditions as shown in Table 1, and the time until the end of the life was measured. The results are shown in Table 2.

  As can be seen from Table 2, in Example 1 using a material obtained by molding organic fibers and inorganic fibers with a binder resin as an insert material, in Example 2, the looseness between the block and the center belt is less, and the length is further increased to 150 hours. The block was damaged when it traveled for a time, and its life was reached, whereas in the comparative example, the life was reached by cutting the center belt in only 20 hours.

  This is considered to be due to the difference in centrifugal force when the belt is run due to the difference in weight between the example and the comparative example. In the comparative example, since an aluminum alloy insert is used, it is considered that the weight of the belt is large and the centrifugal force is large, the load on the center belt is increased and the belt is cut early. On the other hand, in the belt of the embodiment, the burden on the center belt is small, and the failure due to the block breakage occurs before the center belt is cut.

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

It is a perspective schematic diagram showing an example of the high load transmission belt concerning the present invention. It is a perspective schematic diagram showing other examples of the high load power transmission belt concerning the present invention. It is a front view of the block concerning a belt in FIG. FIG. 3 is a front view of a block according to the belt in FIG. 2. It is a front view which shows the example of another block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Block 2a Insert material 2b Cover material 3a Center belt 3b Center belt 4 Elastomer 5 Core body 6 Upper surface 7 Lower surface 11 Upper beam part 12 Lower beam part 13 Center pillar 14 Fitting groove 15 Fitting groove 18 Groove Part 19 Groove part 20 Convex part 21 Convex part T Protrusion

Claims (6)

  Surface of an insert material made of a resin composition in which organic fibers and inorganic fibers are molded with a binder resin in a high load transmission belt comprising a center belt and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt A high-load transmission belt characterized by using a block provided with a covering material.   The high-load transmission belt according to claim 1, wherein the insert material contains 10 to 70% by mass of organic fiber, 1 to 80% by mass of inorganic fiber, and 10 to 85% by mass of thermosetting resin.   The high load transmission belt according to claim 1, wherein the organic fiber is pulp.   The high load transmission belt according to claim 1, wherein the binder resin is a phenol resin, an epoxy resin, or a diallyl phthalate resin.   The high-load transmission belt according to claim 1, wherein the coating material is a resin composition in which 1 to 30% by mass of zinc oxide whisker and 1 to 60% by mass of a fibrous reinforcing material are blended with respect to the thermoplastic resin.   The high-load transmission belt according to claim 1, wherein the coating material is a polyamide resin composition.

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