JP2009228896A - High-load transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-load transmission belt reducing generation of noises when separating a block from a pulley, and restraining generation of swinging in the vertical direction of the belt. <P>SOLUTION: In the high-load transmission belt 1 mounting a plurality of blocks 2 along the longitudinal direction of a center belt 3, right and left side faces 2a, 2b of each block 2 is positioned by shifting in a running direction by making the block 2 arrange to incline in the belt width direction. An inclination in the belt width direction of the block 2 is in a range of 2-20°. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a high-load transmission belt in which a plurality of blocks are mounted and fixed along the longitudinal direction of the center belt. The smooth release of the belt from the pulley during traveling causes noise generation and the vertical movement of the belt. The present invention relates to a high-load transmission belt that can prevent vibration, extend the life of the belt, and reduce the level of noise generated.

  As a belt used for a belt-type continuously variable transmission or the like, there are a center belt in which a core is embedded in an elastomer, and a belt of a type in which a plurality of blocks are mounted along the longitudinal direction of the center belt (Patent Document 1). .

  The problem with this type of belt is the amount of noise. When the block enters the pulley during running of the belt or when the block comes out of the pulley, a noise that the block collides with the pulley or a rubbing noise is generated. A large number of blocks are mounted on the entire circumference of the belt, and sound is generated in the pitch period of the blocks as many as the number of blocks mounted while the belt goes around the pulley. Similarly, since the V-shaped belt is wound around the V-shaped pulley with tension, the belt is firmly sandwiched in the pulley due to the wedge effect, so the impact sound when the belt enters the pulley, The noise generated when a block comes out of a pulley can be quite loud. Unlike the conventional rubber belt, the block is also made of a hard resin material, and the sound generated by contact with the pulley is further increased.

  In order to reduce pitch noise generated in a belt equipped with such a block, in Patent Document 1, noise is generated by slightly projecting and buffering a rubber center belt from the side surface of the block in contact with the pulley. A method of reducing is disclosed.

  In Patent Document 2, two types of blocks having a trapezoidal shape and an inverted trapezoidal cross-sectional shape in the longitudinal direction of the belt are alternately arranged, and two blocks adjacent to each other on a line toward the center of the pulley at a place where the block is wound around the pulley. Are overlapping. By doing so, the contact between the pulley and the block is continuously made without interruption, so that the occurrence of pitch noise can be reduced.

  Similarly, Patent Document 3 discloses that the frequency of the pitch noise is dispersed by shifting the upper and lower beams of the block in the longitudinal direction of the belt, thereby reducing the noise during belt running.

JP 60-49151 A Japanese Utility Model Publication No. 60-122052 JP 2001-90787 A

  In the belt disclosed in Patent Document 1, heat generated by friction between the center belt protruding from the block and the pulley is large, and the center belt and the block are deteriorated at an early stage, leading to a failure of the belt. There is a problem that the effect of buffering due to dripping is lost early.

  In Patent Document 2, the rear block is in contact with the adjacent block in the pulley radial direction where the front block is in contact, and the contact between the block and the pulley is not interrupted. Noise is generated when the block enters the pulley and the end first contacts the pulley.

  Similarly, in Patent Document 3, although the overall sound pressure can be suppressed by making the noise different in frequency at the top and bottom of the block and shifting the pitch, the end of the block is the pulley when the block enters the pulley. Noise also occurs when touching.

  Furthermore, the block wound around the pulley is in a state of being firmly sandwiched between the pulleys due to the V-shaped wedge effect. When the block is detached from the pulley, the block is forcibly pulled out of the pulley by the center belt. As a result, frictional noise was generated and the belt was shaken in the vertical direction.

  An object of the present invention is to provide a high-load transmission belt that can reduce noise generated when a block is detached from a pulley and can also suppress occurrence of up-down vibration of the belt.

  In order to achieve the above object, in claim 1 of the present invention, in a center belt in which a core is embedded in an elastomer, and a high load transmission belt in which a plurality of blocks are mounted along the longitudinal direction of the center belt, The left and right side surfaces of each block are characterized by being shifted from the traveling direction.

  According to a second aspect of the present invention, the high load transmission belt according to the first aspect is provided, wherein the blocks are arranged with an inclination with respect to the belt width direction.

  In Claim 3, it is set as the high load power transmission belt of Claim 2 whose inclination with respect to the width direction of a block exists in the range of 2-20 degrees.

  In claim 4, the block includes a central portion in the width direction and both end portions, and one of the both end portions is arranged to be shifted forward of the belt traveling direction with respect to the central portion, and the other is in relation to the central portion The high load transmission belt according to claim 1, wherein the high load transmission belt is disposed rearward in the belt traveling direction.

  In Claim 5, the accommodating part of the said protrusion part of an adjacent block is formed in the back or front of the protrusion produced by arrange | positioning the both ends of a block shifting ahead or back of a belt advancing direction. The high load transmission belt described in 4 is used.

  According to a sixth aspect of the present invention, there is provided the high load transmission belt according to the fifth aspect of the present invention, wherein the protruding portion and the accommodating portion are fitted to prevent the block from being inclined with respect to the center belt.

  In claim 1, the block is arranged with an inclination with respect to the center belt, and the left and right side surfaces of the block are displaced with respect to the traveling direction. Since the left and right side surfaces are separated from the pulley separately, even a block sandwiched in the pulley by the wedge effect can be pulled out relatively easily.

  According to the second aspect of the present invention, the block is disposed with an inclination with respect to the belt width direction, and the positions of the left and right side surfaces of the block can be shifted with respect to the belt traveling direction.

  In claim 3, the inclination with respect to the width direction of the block is in the range of 2 to 20 °, and it is possible to obtain the effect of reducing the generation of noise by shifting the positions of the left and right side surfaces, and Insufficient fixing between the center belt and backlash of the block with respect to the center belt or excessive movement of the running block will lead to an early life due to failure such as block breakage or center belt cutting. There is no such thing.

  According to the fourth aspect of the present invention, since both end portions of the block are shifted from the central portion, when the belt is run, when the block comes out of the pulley, one side of each side surface escapes from the pulley separately. Therefore, even if the block is sandwiched in the pulley by the wedge effect, it can be easily pulled out, and the generation of noise can be suppressed.

  In Claim 5, the accommodating part of the protrusion part formed by arrange | positioning the both ends of a block with respect to the center part is provided, and it has comprised so that both may be fitted, and the pitch of a block is enlarged. Therefore, the occurrence of pitch noise can be made smaller.

  According to the sixth aspect of the present invention, it is possible to prevent the block from being inclined with respect to the center belt by fitting the protruding portion and the accommodating portion, and it is possible to suppress a reduction in power transmission efficiency as well as generation of noise.

  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 plan view showing the same part. The high-load transmission belt 1 of the present invention includes two center belts 3 and 3 having the same width, in which a core wire 5 is spirally embedded in an elastomer 4 and a cover canvas is coated on the surface as necessary. It is composed of a plurality of blocks 2 that are locked and fixed to the center belts 3 and 3. 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 the center belts 3 and 3 that are locked and fixed. 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 3 and 3 are attached to both side surfaces 2 a and 2 b of the block 2. Fitting grooves 8 and 8 to be fitted are formed. Further, the groove upper surface and the groove lower surface in the fitting groove 8 are provided with ridges 10 that engage with the recesses 9 provided on the upper and lower surfaces of the center belts 3 and 3 so that both engage. It has become.

  Moreover, it is preferable that the block 2 in this invention consists only of resin materials. In this way, when the block 2 in which the insert material made of metal such as aluminum alloy is not embedded is used, the belt can be reduced in weight as compared with the belt using the block in which the insert material is embedded. Although it has the advantage that the centrifugal force generated in the vehicle is small, it is suitable for high-revolution applications with relatively light loads such as motorcycles.

  The high load transmission belt 1 of the present invention is characterized in that the belt travels along the center belt 3, but the left and right side surfaces 2a and 2b of the block 2 are shifted from the traveling direction of the belt. .

  A V-belt like the present invention is wound around a pulley having a V-groove, and the belt is wound around the V-groove and tension is applied, so that the belt side surface and the V wall surface of the pulley are strongly pressed by the wedge effect. Thus, high torque can be transmitted without slipping between the belt and the pulley. On the contrary, the fact that the belt is pressed firmly by the wedge effect is a great resistance when the belt is pulled out of the pulley. In the case of a belt with a block attached to the center belt, the block receives the side pressure of the pulley to transmit power, and the block is firmly sandwiched by the wedge due to the wedge effect, so that the pulley does not come out of the pulley. It becomes difficult.

  By shifting the positions of the left and right side surfaces of the block with respect to the traveling direction as in the present invention, the block is not pulled out by the center belt at a stretch between the pulleys. After leaving, the remaining surface is moved away from the pulley, and the entire block is detached from the pulley. Since it is possible to avoid a situation in which a sound that is easily pulled out from the state of being pinched by the pulley can be avoided, the noise of the belt can be reduced as a result.

  As a form in which the positions of the left and right side surfaces of the block 2 are shifted, a method of fixing the block 2 in an inclined state with respect to the center belt 3 as shown in FIGS. In this example, the width direction of the center belt 3 coincides with the belt width direction, but the width direction of the block 2 is inclined with respect to the width direction of the belt. The protruding strips 10 in the fitting grooves of the block 2 are arranged so as to be inclined in opposite directions on the left and right sides of the block with respect to the width direction of the block, while the concave strips 9 of the center belt 3 They are arranged in the width direction. Therefore, by engaging the both, the center belt 3 and the block 2 are fitted in an inclined state, and the left and right side surfaces 2a and 2b of the block 2 are positioned so as to be shifted with respect to the belt traveling direction. Further, the left and right side surfaces 2a and 2b are directed in the state in which the block 2 is inclined and are directed in the belt width direction and in contact with the V groove surface of the pulley.

  FIG. 3 is a main part plan view showing another form in which the positions of the left and right side surfaces 2a and 2b of the block 2 are shifted. In the example of FIG. 3, the left and right center belts 3 are shifted by a half pitch in the rotation direction of the belt as compared with the example of FIG. 2, and the slopes of the ridges 10 of the block 2 and the left and right side surfaces 2a, 2b of the block It has become an angle. Further, by adopting this form, the thickness of the block can be reduced, so that the pitch noise can be further suppressed to a low level.

  In any example, the inclination angle of the block 2 with respect to the belt traveling direction is preferably in the range of 2 to 20 °. When the inclination angle is less than 2 °, the displacement between the left and right side surfaces 2a and 2b of the block is small, and there is little effect of reducing the sound generation when leaving the pulley, and when the inclination angle exceeds 20 °, the side pressure from the pulley The force in the direction of rotating the block 2 when receiving the force increases, loosening of the fitting between the block 2 and the center belt 3 occurs, and the fixing becomes insufficient. Or cutting or breakage of the block 2 is undesirable.

FIG. 4 is a plan view of an essential part showing another form on the dish in which the positions of the left and right side surfaces 2 a and 2 b of the block 2 are shifted, and FIG. 5 is a plan view of the block 2. In this embodiment, the block 2 includes a central portion C in the width direction and end portions E ₁ and E ₂ located on both sides thereof, and _{one of} the end portions E ₁ and E _{2 is} a belt with respect to the central portion C. The other side is arranged to be shifted in the forward direction of the traveling direction, and the other side is disposed behind the central part C in the forward direction of the belt. 4, the end portion E ₁ in FIG. 5, is shifted to the front side of the central station C, a end E ₂ of the opposite side are shifted to the rear side.

  By adopting the configuration as shown in FIG. 4, the block shown in FIGS. 1, 2 and 3 is sandwiched between pulleys at once with the center belt, similarly to the case where the block shown in FIGS. Rather than being pulled out, first, only one surface first moves away from the pulley, then the remaining surface moves away from the pulley, and the entire block moves away from the pulley. Since it is possible to avoid a situation in which a sound that is easily pulled out from the state of being pinched by the pulley can be avoided, the noise of the belt can be reduced as a result.

Further, by shifting the positions of the end portions E ₁ and E ₂ from the central portion C in this way, the thickness d of the block 2 is increased. As the block thickness increases, the block pitch in the belt increases, which generally increases pitch noise. However, by a housing part to accommodate the space S can be on the rear side by causing shifting the end portion E ₁ in front of the respective belts traveling direction, the end portion projecting portion of the E ₁ of adjacent blocks, the block pitch The pitch noise can be prevented from increasing without increasing the pitch noise.

  The block 2 is a block basically made of a resin composition, and the resin material is formed on the surface of the block 2 made only of the resin composition and the surface of the insert material made of metal or the like in the resin composition and having the same substantially letter shape as the block. The one coated with may be used.

  In the case of a block having an insert material, the insert material is a part that gives the side pressure resistance and bending rigidity of the block 2 and includes aluminum alloy, ceramics, a composite material of ceramics and aluminum, and carbon fiber reinforcement. Examples include materials such as 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 higher in strength, but for belts that rotate at high speeds, the weight of the belt greatly affects the service life, and this is advantageous in terms of weight reduction. It is preferable to use an alloy. However, the metal material is excellent in terms of imparting lateral pressure resistance and bending rigidity, and it is preferable to use a block 2 in which a predetermined portion of the insert material is coated with a resin material.

  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 part where the insert material is fixed when the resin material is coated on the manufacturing process is in contact with the part where the insert material is exposed. There is no problem as long as the portion that comes into contact with the pulley and the portion where the blocks come into contact with each other are covered with resin.

  Of course, as described above, the block 2 may be made of only a resin material having no insert material as described above. When using the block 2 in which the insert material is not embedded, the weight can be reduced as compared with the belt using the block in which the insert material is embedded. However, it is suitable for applications with relatively light loads and high rotation, such as motorcycles.

  The resin material has a relatively large friction coefficient and excellent wear resistance, and has a higher rigidity than the elastomer 4 constituting the center belt 3, specifically, a hard rubber having a hardness of 90 ° JIS A or more, a hard polyurethane 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) resin, Rubbers and synthetic resins such as polyether sulfone (PES) resin and polyether ether ketone (PEEK) resin are used.

  Among these, a thermoplastic resin such as a polyamide resin is used to manufacture the block by an injection molding method in order to efficiently manufacture the block. Further, it is preferable to use a resin having a low coefficient of friction, excellent wear resistance, rigidity, elasticity against bending, and a resin that 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. .

  A material used as the elastomer 4 of the center belt 3 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.

  In the present embodiment, the case where the two center belts 3 and 3 are used and mounted in the fitting groove 20 of the block 2 is described. However, another center belt is used. It doesn't matter.

  Cover belts 14 are arranged on the upper and lower surfaces of the center belt 3 so as to protect the center belt from friction between the center belt and the block generated during belt running. By adopting such a configuration, wear of the center belt 3 due to friction with the block 2 is prevented. In particular, when a whisker-like reinforcing material such as zinc oxide whisker is blended in the block 2, the wear on the center belt side tends to become very large due to the whisker while rubbing against the center belt. Can be prevented. Further, by using an aramid fiber as the material of the cover canvas 14, the effect of preventing wear can be further enhanced, and failure due to cutting of the belt can be reduced.

  Examples of the cover canvas 14 that can be used include plain woven fabrics, twill woven fabrics, and satin woven fabrics. All of them need not be aramid fibers, and examples thereof include a form using aramid fibers in the wefts 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 14 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 examples of the meta-aramid fiber include 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 processing is performed to laminate and bond the cover canvas 14 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. In addition, a glueing process, a soaking process, and a coaching process in which a rubber paste dissolved in a solvent is attached to the surface of the cover canvas 14 can also be cited as an adhesion 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.

  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 principal part top view of the high load power transmission belt of this invention. It is a principal part top view of the high load power transmission belt which shows another example of this invention. It is a principal part top view of the high load power transmission belt which shows another example of this invention. It is a top view of the block used with the belt of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High load power transmission belt 2 Block 2a Side surface 2b Side surface 3 Center belt 4 Elastomer 5 Core wire 8 Fitting groove 9 Concave part 10 Convex part 11 Upper beam part 12 Lower beam part 13 Center pillar 14 Cover canvas

Claims (6)

  In a center belt in which a core is embedded in an elastomer and a high-load transmission belt in which a plurality of blocks are mounted along the longitudinal direction of the center belt, the left and right side surfaces of each block are positioned so as to be shifted from the traveling direction. High load transmission belt featuring   2. The high load transmission belt according to claim 1, wherein the blocks are arranged with an inclination with respect to the belt width direction.   The high load transmission belt according to claim 2, wherein the inclination of the block with respect to the width direction is within a range of 2 to 20 °.   The block is composed of a central portion and both end portions in the width direction, and one of the both end portions is arranged so as to be shifted forward in the belt traveling direction with respect to the central portion, and the other is rearward in the belt traveling direction with respect to the central portion. The high-load transmission belt according to claim 1, wherein   5. The high load according to claim 4, wherein a housing portion for the projecting portion of the adjacent block is formed behind or in front of the projecting portion generated by disposing the both end portions of the block forward or backward in the belt traveling direction. Transmission belt.   6. The high load transmission belt according to claim 5, wherein the projecting portion and the accommodating portion are fitted together to prevent the block from being inclined with respect to the center belt.

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