JP2006153134A - High-load transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-load transmission belt capable of preventing problems such as wear or heating by regulating movement between a block and a center belt while the center belt is attached. <P>SOLUTION: The high-load transmission belt comprises a center belt 3, and a block 2 which connects an upper beam 11 with a lower beam 12 by a pillar 13 and comprises grooves 8 and 9 for attaching the center belt 3. Ridges 17 and 18 in belt-width direction are formed on the groove upper surface and groove lower surface in the groove. Slots 15 and 16 in belt-width direction are formed at a prescribe pitch on the center belt as well. Engaging of the ridges 17 and 18 with the slots 15 and 16 regulates moving of the block in belt advancing direction relative to the center belt. The center belt 3 is bonded to the block 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a high load transmission belt in which a large number of blocks are fixed along the longitudinal direction of the center belt, and more specifically, the wear of the belt caused by friction between the center belt and the block is reduced and the center belt is cut. The present invention relates to a long-life high-load transmission belt that prevents failure.

  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 high-load transmission belt in which the block is fixed to the center belt and the strength in the belt width direction is increased. As a specific configuration, the core is made of an elastomer such as rubber. A block made of a relatively hard elastomer than the elastomer used for the center belt is secured to the center belt embedded in the center belt using a fastening material such as a bolt or a rivet. There is a belt having grooves on both side surfaces of the block, and a pair of center belts fitted into the grooves provided on the side surfaces.

  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 stress concentration 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.

  Therefore, in order to alleviate the concentration of stress applied to the center belt, in Patent Document 2, the upper end of the convex portion provided on the inner peripheral surface of the center belt is set to be located 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.

  Further, in Patent Document 3, 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 curvature radius 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

Japanese Patent Laid-Open No. 63-34342 Japanese Patent Laid-Open No. 62-151646 Japanese Patent Laid-Open No. 9-25999

  By adopting a configuration such as Patent Document 2 and Patent Document 3, friction is generated between the block and the center belt due to the bending of the belt, 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.

  Therefore, in the present invention, even if friction occurs between the block and the center belt during belt running, the center belt does not wear and generates little heat, and the life of the belt due to cutting of the center belt can be prevented, and It is an object to provide a high-load transmission belt that alleviates deterioration of the block and center belt.

  According to a first aspect of the present invention, a center belt in which a core wire is embedded in an elastomer, a block having a groove surrounded by upper and lower beams and a pillar for connecting the upper beam and the lower beam by a pillar and mounting the center belt, And a groove in the belt width direction is formed on the upper surface and the lower surface of the groove in the groove, and a groove in the belt width direction is formed on the center belt at a predetermined pitch. In the high load transmission belt in which the movement of the block in the belt traveling direction with respect to the center belt is restricted by the engagement of the concave portions, the center belt and the block are bonded and fixed.

  In the high load transmission belt of the present invention, since the center belt and the block are bonded and fixed, friction does not occur between the block and the belt when the belt is running. It is possible to reduce failures such as cutting. Further, heat generation due to friction can be reduced, and deterioration of the resin material constituting the block can be prevented.

  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 includes two center belts 3 (3a, 3b) having the same width formed by embedding a core wire 5 in a spiral shape in an elastomer 4, and the center belts 3 (3a, 3b). And a plurality of blocks 2 which are locked and fixed to each other. Both side surfaces 2a and 2b 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 are locked by the center belt 3 (3a 3b), and the power of the driving pulley is transmitted to the driven pulley.

  The block 2 is composed of an upper beam 11 and a lower beam 12, and pillars 13 connecting the central portions of the upper and lower beams 11 and 12, and between the two side surfaces 2a and 2b of the block 2 and between 2c and 2d. Groove portions 14 and 15 into which the pair of center belts 3 (3a and 3b) are fitted are formed. Also, the groove upper surface 16 and the groove lower surface 17 in the groove portion 15 are engaged with a groove portion 18 provided on the groove upper surface of the center belt 3 (3a, 3b) and a groove portion 19 provided on the lower surface. The parts 20 and 21 are engaged. In the present invention, the block 2 and the center belt 3 are bonded and fixed with an adhesive. Conventionally, the block 2 and the center belt 3 rub against each other while the belt is running, so that the center belt 3 and the block 2 are worn or heat is generated, and the materials constituting each of them deteriorate, leading to cutting of the belt, etc. There was a problem. However, such a problem can be solved by bonding and fixing the block 2 and the center belt 3 together.

  FIG. 3 is an example of another belt, and a pair of side pillars 22 and 23 extend upward from both ends of the beam portion 21, and the upper ends of the side pillars 22 and 23 respectively extend toward the center of the block 2. Extending lock portions 24 and 25 are provided so as to face each other. The beam portion 21, the side pillars 22 and 23, and the lock portions 24 and 25 form a fitting groove 20 into which the center belt 3 is fitted. The center belt 3 is inserted into the fitting groove 20 through the opening between the lock portions 24 and 25 and attached. Further, convex portions 27 are respectively provided on the side of the fitting grooves 20 of the lock portions 24 and 25, and the convex portions 27 are fitted to the concave strip portions 26 provided on the center belt 3 at a predetermined pitch. To do. As a result, the center belt 3 is not easily removed from the block 2 after being mounted. Even in such a form, in the present invention, the block 2 and the center belt 3 are bonded and fixed.

  In addition, the block 2 in the present invention may be either a resin material alone or a resin material embedded with an insert material made of a metal such as an aluminum alloy. 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.

  In the present invention, the block 2 and the center belt 3 are bonded and fixed, for example, by adhering an adhesive 10 to the surface of the center belt 3, but the block 2 and the center belt 3 are made of materials as described later. Depending on the material, the type of the adhesive 10 that is suitable differs, but examples of the adhesive 10 that can be used include isocyanate resins and epoxy resins. Various types of bonding can be applied, and it is possible to apply a method in which the adhesive 10 in a primer state is attached to the center belt 3 and dried, and the block 2 is attached and then heat-treated for bonding. It is. Also, the adhesive 10 is attached by a method in which an adhesive is applied to a portion of the center belt 3 that contacts the block 2, a method in which the entire center belt 3 is applied to an adhesive solution and dried, and an adhesive is applied to the block side. The method etc. which apply | coat can be taken.

  The block 2 in the present invention is formed by molding the resin into a predetermined shape as described above, and examples include a block in which the surface of the insert material is coated with the resin material and the block made entirely of the resin material. .

  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, metal materials are preferable. Among 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.

  When the block 2 which does not have the insert material made only of the resin material is used as the block 2, the weight can be reduced as compared with the belt using the block in which the insert material is embedded. Although it has the advantage that the generated centrifugal force is small, it is suitable for high-revolution applications with relatively light loads such as motorcycles.

  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, in order to manufacture the block 2 efficiently by an injection molding method, a thermoplastic resin such as a polyamide resin is used. In addition, it is preferable to use a resin that has a low coefficient of friction, excellent wear resistance, is rigid, has elasticity in bending, and does not easily break. 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, it is possible to mix a fibrous reinforcing material or a whisker-shaped reinforcing material in the resin material forming the block as described above, and the fibrous reinforcing material is blended in the range of 15 to 40% by weight. To do. If it is less than 15% by weight, there is a problem that the reinforcing effect is small and the wear resistance of the block is not sufficient, and if it exceeds 40% by weight, it becomes difficult to blend into a resin or injection molding becomes difficult. Because there is a problem, it is not preferable.

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

  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. .

  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.

  A cover canvas (not shown) may be laminated on the surface of the center belt 3 integrally with the center belt 3. Plain canvas, twill fabric, satin fabric, etc. can be used as cover canvas, and materials such as polyamide fiber, polyester fiber, cotton, aramid fiber, etc. can be used, but problems such as wear and cutting are prevented. For this purpose, it is preferable to use an aramid fiber. For example, an aramid fiber may be used for the weft in the belt longitudinal direction. 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 in the longitudinal direction of the belt is lowered and the wear resistance is inferior. On the other hand, if the thickness exceeds 1.2 denier, the rigidity of the cover canvas becomes too high after weaving, which may cause the balance between the warp and weft to be lost or cause wrinkles in the canvas. Absent.

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

  Adhesion treatment is performed to laminate and bond the cover canvas 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 liquid is a mixture of resorcin and formalin condensate in latex. The latex used here is styrene / butadiene / pyridine terpolymer, hydrogenated nitrile rubber, chlorosulfonated polyethylene, epichlorohydrin, etc. The latex. Further, a pasting process in which a rubber paste dissolved in a solvent is attached to the surface of the cover canvas can be cited as an adhesive process.

  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, for example, a belt having a configuration in which a substantially U-shaped block is used and a center belt is fitted in a groove portion opened on one side surface may be used.

  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 of Example 1 uses a belt as shown in FIG. 1, and the resin used for the block is a blend of 30% by mass of carbon fiber with respect to 4,6-nylon. It was. As the center belt, an aramid fiber was used for the core and chloroprene rubber was used for the elastomer. The center belt was immersed in a 50 wt% solution of PAPI135 (Mitsubishi Chemical Dow's isocyanate resin) for 10 seconds and allowed to dry naturally for 3 minutes. The block and the center belt were bonded and fixed by heating for a minute. The obtained belt was run to check the wear situation of the cover canvas after running. The belt running conditions were as shown in Table 1. The test results are shown in Table 2.

(Comparative Example 1)
In Comparative Example 1, a high load transmission belt similar to that in Example 1 was used except that the block and the center belt were not bonded and fixed. A running test was conducted in the same manner as in Example 1. The results are shown in Table 2.

  From the results of Table 2, the cover canvas was worn in the comparative example that was run under the same conditions except that the block and the center belt were not adhered and fixed, whereas in the example, there was no wear. It was confirmed that the wear could be prevented by fixing the block and the center belt with an adhesive, and that no other problems occurred.

  The block attached to the belt can be prevented from cracking in multiple directions, and the effective diameter of the pulley, such as a continuously variable transmission of an automobile, a motorcycle, or an agricultural machine, can change to transmit a large torque. Can be applied as a belt.

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 perspective view of the high load transmission belt which shows another example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High load power transmission belt 2 Block 3 Center belt 4 Elastomer 5 Core wire 6 Side surface 7 Side surface 8 Fitting groove 9 Fitting groove 10 Adhesive 11 Upper beam part 12 Lower beam part 13 Center pillar 15 Concave part 16 Concave part 17 Convex section 18 Convex section

Claims (1)

A center belt in which a core wire is embedded in an elastomer, a block having a groove portion surrounded by a pillar and an upper beam and a lower beam for attaching the center belt by connecting the upper beam and the lower beam by a pillar. Convex ridges in the belt width direction are formed on the groove upper surface and the groove lower surface of the groove, while a groove in the belt width direction is also formed on the center belt at a predetermined pitch, and the ridges and the recesses mesh with each other. A high-load transmission belt, wherein the center belt and the block are bonded and fixed in a high-load transmission belt in which movement of the block with respect to the center belt in the belt traveling direction is regulated.

Images