JP2006207793A - Heavy load transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heavy load transmission belt, preventing abrasion of a center belt even if friction occurs with a block during running of the belt to reduce a trouble such as cutting, and reducing generation of heat to prevent deterioration of resin material forming the block. <P>SOLUTION: This heavy load transmission belt 1 provided with the center belt 3 in which a core wire 5 is spirally embedded in elastomer 4 and a plurality of blocks 2 disposed along the longitudinal direction of the center belt. A protective layer 10 is disposed on at least one side of upper and lower surfaces of the center belt 3, thereby protecting the center belt 3 from friction with the blocks. <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.

  In order to solve the above-described problems, the present invention provides a center belt and a high-load transmission belt provided with a plurality of blocks along the longitudinal direction of the center belt. It has a protective layer having a thickness of 1 to 100 μm on the surface of at least the part that embeds the body and contacts the block.

  In claim 2, the protective layer is made of a thermosetting resin, in claim 3, the protective layer is made of urethane resin, and in claim 4, the protective layer is a high load transmission belt made of a metal plating layer. According to a fifth aspect of the present invention, the belt is a high load transmission belt comprising a metal plating layer containing a fluororesin.

  According to a sixth aspect of the present invention, the center belt has a cover canvas on at least one surface, and is a high load transmission belt in which a protective layer is provided on the cover canvas.

  By disposing a protective layer on the surface of the center belt, it is possible to prevent the center belt from being worn and reduce failures such as cutting of the belt even if friction occurs with the block during belt running. Further, the heat generation can be reduced, and the deterioration of the resin material constituting the block can be prevented.

  In claim 2, a thermosetting resin is used as the protective layer, in claim 3, a urethane resin is used as the reinforcing resin, and in claim 4, a metal plating layer is used, which is excellent in wear resistance. The heat resistance is also excellent, and the deterioration due to wear and heat as described above can be reduced. Further, when the metal plating layer contains a fluororesin as in the fifth aspect, even if the friction coefficient is low and rubbing between the blocks, the amount of wear can be reduced.

  According to the sixth aspect of the present invention, the cover belt is provided on the surface of the center belt, and the protective layer is disposed on the cover belt. The center belt can be protected by the protective layer in addition to the reinforcement with the cover canvas. Can be more effectively prevented.

  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 is attached to two center belts 3 of the same width formed by embedding a rope-like core body 5 in an elastomer 4 in a spiral shape, and attached to the center belt 3 at a predetermined pitch. It is composed of a plurality of blocks 2. The side faces 6 and 7 of the block have fitting grooves 8 and 9, and the center belt 3 is mounted in the fitting grooves. Both side surfaces 6 and 7 of the block 2 are inclined surfaces that come into contact with the V-grooves of the pulley, receive power from the driven pulley, pull the center belt 3 that is locked and fixed, and drive pulley Is transmitted to the driven pulley. A protective layer 10, which is a feature of the present invention, is laminated and disposed integrally with the center belt 3 on the surface of the center belt 3.

  As shown in FIG. 1, the block 2 includes an upper beam portion 11 and a lower beam portion 12, and a center pillar 13 in which the central portions of the upper and lower beam portions 11 and 12 are connected to each other. As described above, the fitting grooves 8 and 9 of the center belt 3 are formed, and the groove upper surface and the groove lower surface in the fitting grooves 8 and 9 are formed on the groove 15 and the lower surface provided on the upper surface of the center belt 3. Convex ridges 17 and 18 that engage with the provided concave ridges 16 are provided.

  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. The extending lock portions 24 and 25 are provided 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. A protective layer 10 is laminated and disposed integrally with the center belt 3 on the surface of the center belt 3.

  The center belt 3 used as the elastomer 4 is a single material such as chloroprene rubber, natural rubber, nitrile rubber, styrene-butadiene rubber, hydrogenated nitrile rubber, chlorosulfonated polyethylene, alkylated chlorosulfonated polyethylene, or the like. And rubber or polyurethane rubber blended appropriately. 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.

  As shown in FIG. 2, the center belt 3 is provided with protective layers 10 on both the upper and lower surfaces, so that the center belt is protected from friction between the center belt and the block that occurs during belt running. 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 10 include a polyisocyanate resin, a urethane resin, an epoxy resin, a melamine resin, an unsaturated polyester resin, a silicone resin, and a fluororesin, and 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 10, specifically, an electroless nickel plating can be applied to the surface of the center belt 3, and the protective layer 10 is immersed in a plating solution. It can be formed easily. It is also possible to contain 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.

  The thickness of the protective layer 10 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 10 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. Can be used. 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 a plurality of times.

  In the example shown in FIG. 2, the protective layer 10 is provided on the surface of the elastomer 4. However, a structure in which a cover canvas is laminated on the elastomer 4 and the protective layer 10 is further provided on the cover canvas is the same. The intended effect of the present invention can be obtained.

  In the embodiment shown in FIGS. 1 to 3, the belt is assembled by inserting a center belt into a fitting groove opened on the side surface or upper surface of the molded block. The present invention can also be applied to a form in which a substantially rectangular block is formed around the center belt by injection molding of resin with the belt set in a mold.

  In FIG. 4, the high load transmission belt 1 is fitted to a center belt 3 in which a core wire 5 is spirally embedded in an elastomer 4 and recesses 15 and 16 formed on the upper and lower surfaces of the center belt 3 at a predetermined pitch. And it is comprised from the some block 2 currently latched and fixed. Both side surfaces 6 and 7 of the block 2 are inclined surfaces that engage with the V-grooves of the pulley, and receive power from the driven pulley to pull the center belt 3 that is locked and fixed. The power of the driving pulley is transmitted to the driven pulley. Although not shown, a protective layer is integrally laminated on the center belt 3 on the surface of the center belt 3 to protect the center belt 3 from wear due to friction with the block 2.

  In the block 2, as shown in FIG. 4, the upper beam portion 11 and the lower beam portion 12, and both side portions 14 and 14 are integrally formed around the center belt 3. The center of the block 2 has an opening 19 into which the center belt 3 is fitted. The upper surface and the lower surface in the opening 15 have a groove 15 provided on the upper surface of the center belt 3 and a groove 16 provided on the lower surface. A ridge is formed to engage the.

  In the production of a high load transmission belt as shown in FIG. 4 in which resin is injected with the center belt set in the mold and blocks are formed around the center belt, a pair of molds as shown in FIGS. The molds 30 and 31 are used, the molds 30 and 31 have a center belt holding portion 32, and a cavity 33 for molding the block 2 is formed in a state where the pair of molds 30 and 31 are combined. The resin is injected from the gate 34 into the cavity 33 in the molds 30 and 31 with the center belt 3 set on the center belt holding portion 32. The center belt 3 has recesses 43 and 44 for fitting with the center belt holding portion 32 of the mold between the recesses 41 and 42 for fitting with the upper and lower blocks 2, and the block 2 is injection molded. The center belt 3 is positioned at the time of molding by the above method.

  The cavity 33 is disposed so as to surround the center belt 3 with the center belt 3 fitted in the center belt holding portion 32. When the block 2 is formed in the cavity 33, the block 2 is formed in the center belt 3 with the concave strip 41, 42 is formed in a state of being fitted.

  Through the steps as described above, the block 2 can be formed and attached to the center belt 3 at the same time.

  In the example shown in FIG. 6, there are five cavities 33 provided in the molds 30 and 31, and the number of blocks that can be molded at one time is five. Therefore, after forming five blocks, the belt is once removed from the mold, and the five blocks are rotated in the direction of the arrow in FIG. And 5 blocks 2 are formed at the next position. By repeating such an operation, the entire block 2 around the belt is molded to complete the belt. All may be molded at once using a mold having the same number of cavities as the total number of blocks 2.

  The high-load transmission belt manufactured by the method of forming a block around the center belt by this injection molding is not limited to the example shown in FIG. 4 and can take various forms. The belt shown in FIG. 7 has substantially the same shape as the belt shown in FIG. 4, but has through holes 51 at the same pitch as the block attached to the center of the center belt 3 in the width direction. When the resin is molded, the resin is connected 52 through the through hole 51.

  As described above, the resin forming the block is connected 52 through the through hole 51 provided in the center belt 3, so that the fixing force between the block 2 and the center belt 3 becomes stronger. If the belt 1 continues to run for a long period of time, the block 2 and the center belt 3 will rattle, causing the noise of the belt 1 to increase, the block 2 to be damaged, and the center belt 3 to be cut off. Although it may lead to failure, the life of the belt 1 can be extended by increasing the fixing force between the block 2 and the center belt 3.

  In the example of FIG. 7, the number of the through holes 51 provided in the center belt 3 per block 2 is one, but the number is not limited to one, and a plurality of holes such as two or three are provided. It is also possible to provide.

  The block 2 may be either an insert material made of metal or the like coated with a resin material, or a block material made only of a resin material that is not. When the block 2 that does not use insert material made of metal such as aluminum alloy is used, it is possible to reduce the weight compared to the belt using the block in which the insert material is embedded. Although it has the advantage of low power, it is suitable for high-revolution applications with relatively light loads such as motorcycles.

  Even in the case of manufacturing by injection molding, the block 2 is not limited to the one made only of the synthetic resin material, but is set in the mold with the insert material made of metal such as aluminum alloy attached to the center belt 3. It is also possible to mold the block.

  In the case of the belt as shown in FIGS. 1 to 3, the resin that can be used as the resin of the block 2 is specifically a hard rubber having a hardness of 90 ° JIS A or more, a hard polyurethane resin, a liquid crystal resin, a 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) resin, polyethersulfone (PES) Resin, rubber such as polyetheretherketone (PEEK) resin and synthetic resin are used.

  As the resin of the material used when the block is molded by molding as described in FIGS. 5 to 6, polyamide resin, polyamideimide (PAI) resin, polyphenylene sulfide (PPS) resin, polybutylene terephthalate (PBT) resin, Synthetic resins such as polyimide (PI) resin, polyethersulfone (PES) resin, and polyetheretherketone (PEEK) resin are used. Among them, low friction coefficient, excellent wear resistance, rigidity and rigidity It is preferable to use a resin that has elasticity and does not easily break, and is preferably a polyamide resin, especially nylon 46.

  In addition, these resins contain cotton yarn, chemical fibers such as polyamide fiber and aramid fiber, woven fabric made of glass fiber, metal fiber, carbon fiber, etc., inorganic materials such as filler, whisker, silica, calcium carbonate, etc. May be.

  It is possible to blend a fibrous or whisker-like reinforcing material, and the fibrous reinforcing material is blended in the range of 15 to 40% by weight. 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.

  In addition to these, the lubricity of the block 2 can be improved by mixing at least one selected from molybdenum disulfide, graphite, and fluorine-based 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. .

  In the case where the insert material is embedded in the resin material, the insert material is an insert material that provides the side pressure resistance and bending rigidity of the block 2, and the material is aluminum alloy, ceramics, composite of ceramics and aluminum. Materials, materials such as carbon fiber reinforced resin and iron.

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. However, the metal material is excellent in terms of imparting side pressure resistance and bending rigidity, and it is preferable to use the block 2 in which a predetermined portion of the insert material 22 is coated with the resin material 21.

  When the resin material is arranged at a predetermined location, if an insert material made of a metal material that is slightly smaller than the size of the block 2 is used to cover almost the entire surface with the resin material, 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. However, even if it is the entire surface, the place where the insert material is exposed when the member that fixes the insert material is in contact with the resin material during the manufacturing process will be generated. It can be said that the exposure of the insert material is included in a form in which the entire surface is substantially covered with the resin material.

  The block used for the high load transmission belt according to the present invention is not limited to the form shown in the present embodiment.

(Example 1)
Example 1 is a high load transmission belt as shown in FIG. 1, and 46 nylon containing 30% by mass of carbon fiber was used as the resin material used for the block. As the center belt, an aramid fiber was used for the core 5 and chloroprene rubber was used for the elastomer 4. The belt size was a belt pitch width of 18 mm, a pitch circumference of 690 mm, and a block pitch of 3 mm. 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. The belt was run under the conditions shown in Table 1 and the time until failure occurred was measured. The results are shown in Table 2.

(Example 2)
As Example 2, a belt was produced under the same conditions as Example 1 except that the protective layer provided on the surface of the center belt was metal plating containing polytetrafluoroethylene resin. The results are shown in Table 2.

(Comparative Example 1)
As Comparative Example 1, a belt was produced under exactly the same conditions as in Example 1 except that no protective layer was provided on the surface of the center belt. Similarly, the vehicle was run under the conditions shown in Table 1 and the time until failure occurred was measured. The results are shown in Table 2.

  From the results shown in Table 2, the belt of Comparative Example 1 having no protective layer has reached the end of its life due to the cutting of the belt due to wear of the center belt 290 hours after the start of running, whereas in Example 1 and Example 2, It can be seen that even after 400 hours, the belt can continue to run without any abnormality, and the center belt is protected by the protective layer, and the life can be extended.

  The present invention can be applied to the manufacture of a belt that changes the effective diameter of a pulley and transmits a large torque, such as a continuously variable transmission for an automobile, a motorcycle, and an agricultural machine.

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. It is a perspective view of the high load transmission belt which shows another example of this invention. It is a general | schematic perspective view of the manufacturing apparatus used with the manufacturing method of this invention. It is the front view seen from the place which opened the metal mold | die. 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 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 Protective layer 11 Upper beam part 12 Lower beam part 13 Center pillar 15 Concave part 16 Concave part 17 Projection section 18 Projection section 30 Mold 31 Mold 32 Center belt holding section 33 Cavity 34 Gate

Claims (6)

  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. A high load transmission belt having a protective layer of 100 μm.   The high load transmission belt according to claim 1, wherein the protective layer is made of a thermosetting resin.   The high load transmission belt according to claim 1, wherein the protective layer is made of urethane resin.   The high load transmission belt according to claim 1, wherein the protective layer is a metal plating layer.   The high load transmission belt according to claim 4, wherein the metal plating layer contains a fluororesin. The high-load transmission belt according to claim 1, wherein the center belt has a cover canvas on at least one surface, and a protective layer is provided on the cover canvas.

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