JP4439987B2 - High load transmission belt - Google Patents

Description

  The present invention relates to a high-load transmission belt comprising an elastomer center belt and a block that reinforces lateral pressure resistance, and prevents the occurrence of rattling between the center belt and the block, thereby extending the life of the belt. It is about the technology that can be done.

Conventionally, rubber V-belts are also used as belts that are used for applications that require high-load transmission, such as continuously variable transmissions. If the pressure is about 10 kg / cm ² and the torque is more than that, the rubber V-belt cannot withstand high side pressure and buckles.

  Therefore, many belts have been proposed in which a block made of a hard resin or the like is fixed to a rubber belt in which a core body is embedded as a belt that can withstand a high load, thereby increasing the strength in the belt width direction and improving the durability.

  Patent Document 1 discloses a V-belt composed of a center belt (tension belt) and a number of blocks fitted to the center belt. In the belt formed by engaging the provided ridges, the minimum thickness between the groove grooves on the upper and lower surfaces of the center belt is formed to be larger than the re-spacing interval between the upper and lower ridges of the block. A belt is disclosed in which a center belt and a block are fitted in a state in which the concave groove is compressed and elastically deformed.

  By adopting such a configuration, the occurrence of rattling between the block and the center belt is prevented, the swing of the block during belt running is reduced, and local temperature rise and cracks due to friction between the block and the center belt are prevented. The purpose is to suppress the problem of early cutting due to occurrence.

  Further, in Patent Document 2, by setting the maximum thickness of the convex portion larger than the maximum thickness of the concave portion in the uneven engagement of the block and the center belt, a compressive force in the lateral direction of the belt (belt longitudinal direction) is generated. Disclosed is a technology that can suppress the shakiness of the block and does not generate a residual stress in the fitting portion of the block because no force is generated in the direction of expanding the fitting portion of the center belt of the block. Has been.

Japanese Utility Model Publication No. 1-55344 JP 2004-76875 A

  However, in the belt disclosed in Patent Document 1, the method in which the block and the center belt are compression-fitted is effective in the initial stage of running, but the friction between the center belt and the block is large, and the center belt is fitted. Since the joint portion is repeatedly bent, the thickness of the center belt decreases relatively early, and finally the fitting is loosened and rattling occurs.

  When the rattling occurs, the block swings with respect to the center belt during traveling, leading to problems such as a decrease in power transmission performance, noise generation, or damage to the block, and the life of the belt is shortened.

  The belt disclosed in Patent Document 2 prevents rattling between the block and the center belt with a lateral tightening margin, but is not sufficient to continue preventing rattling for a sufficiently long period.

  In view of the above, an object of the present invention is to provide a belt having a long service life by firmly holding the block and the center belt fixed for a long period of time and preventing the block from swinging during belt running.

  In order to achieve the above object, according to a first aspect of the present invention, an endless center belt in which a core wire is embedded in an elastomer and a block in which a plurality of the center belts are fitted and disposed in the longitudinal direction of the center belt are provided. A groove is provided on the upper surface of the belt, and in the high load transmission belt in which the groove and the protrusion provided in the fitting groove of the block are engaged, the protrusion provided in the fitting groove of the block. The radius of curvature of the arc portion that forms the base is set to be larger than the radius of curvature of the arc portion that forms the groove portion on the upper surface of the center belt.

  According to a second aspect of the present invention, the radius of curvature of the arc portion that forms the tip of the protruding portion provided in the fitting groove of the block is set larger than the radius of curvature of the arc portion that forms the bottom of the groove portion on the upper surface of the center belt. This is a high load transmission belt.

  The curvature radius of each circular arc part forming the convex part provided in the fitting groove of the block as in claims 1 and 2 is larger than the curvature radius of each circular arc part forming the groove part on the upper surface of the center belt. By setting, the protruding portion of the block is fixed by the center belt by the rubber that forms the center belt from the front-rear direction and the vertical direction of the belt traveling direction, and the effect of fixing the block over a long period of time is sustained. Since the block can be prevented from rattling or swinging, the life of the belt can be extended.

  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. 3, the shape of the block 2 includes an upper beam portion 11 and a lower beam portion 12, and center pillars 13 connecting the central portions of the upper and lower beam portions 11 and 12. Are formed with fitting grooves 14 and 15 into which the center belts 3a and 3b are fitted. Further, the groove upper surface 16 and the groove lower surface 17 in the fitting groove 15 are provided with a groove portion 18 provided on the upper surface 6 of the center belt 3a, 3b and a protrusion portion 20 engaged with a groove portion 19 provided on the lower surface 7. , 21 are provided, and the block 2 is locked in the longitudinal direction of the belt by engaging with each other.

  When such a belt is run around the driving pulley and the driven pulley, the belt is always compressed to the thickness of the fitting groove 15 of the block 2 in the groove portions 18 and 19 of the center belts 3a and 3b. As the thickness of the belt 2 becomes thinner, the fitting between the block 2 and the center belts 3a and 3b is gradually loosened to cause rattling. When rattling occurs, there is a problem that the swing of the block 2 with respect to the center belts 3a and 3b during belt running increases, leading to damage to the block 2 and an early life.

In the present invention, as shown in FIGS. 4 and 5, in the relationship between the groove 18 on the upper surface 6 of the center belts 3a and 3b and the protrusion 20 provided in the fitting grooves 14 and 15 of the block, the block 2 The radius of curvature r ₁ of the arc portion R ₁ that forms the ridge portion element provided in the fitting grooves 14 and 15 is the same as that of the arc portion R ₂ that forms the groove portion element of the upper surface 6 of the center belt 3a, 3b. It is set to be larger than the radius of curvature r _2. The radius of curvature r ₃ of the arcuate portion R ₃ to form a further ridge part destination provided in the fitting groove 14, 15 of the block 2, an arc portion forming the center belt 3a, the groove strip portion bottom face 6 of 3b It is set to be larger than the radius of curvature r ₄ of R _4.

By adopting such a configuration, the curvature of the arc portion R ₂ of the radius of curvature r ₁ of the arc portion R ₁ to form a ridge-source block form the center belt 3a, the groove strip portion origin of the upper surface 6 of 3b Since it is larger than the radius r ₂ , when the ridge portion 20 of the block 2 is engaged with the groove portion 18 of the center belt, they interfere with each other, and the movement of the block with respect to the center belt is restricted. Further, since the radius of curvature r ₁ of the arc portion R ₁ forming the ridge portion tip is larger than the radius of curvature r ₂ of the arc portion R ₂ forming the bottom of the groove portion, the groove portion 18 of the center belt is formed. The movement of the block with respect to the center belt is also restricted by interference with the side wall 18a. As a result, the ridges 20 of the block 2 are fixed by the center belts 3a and 3b in a state of being sandwiched by rubber forming the center belt from both the front-rear direction and the vertical direction in the belt traveling direction. Further, the belt life can be extended because the swinging can be prevented.

In this case, the ratio of the radius of curvature r ₁ to the radius of curvature r ₂ is preferably in the range of 1.5 to 2.5. If the size ratio is less than 1.5, there will be little mutual interference, and the effect of fixing the block will not be obtained so much. If it exceeds 2.5, mutual interference will be too great and the deterioration on the center belt side will be quick. This is not preferable because it causes a failure such as a crack.

The radius of curvature r ₃ of the arc portion R ₃ forming the tip of the protruding portion provided in the fitting grooves 14 and 15 of the block 2 and the arc portion R forming the bottom of the groove portion of the upper surface 6 of the center belts 3a and 3b. the size ratio between the curvature radius r ₄ of ₄ is preferably in the range of 1.0 to 1.2, not obtained very much the effect of also securing the block is less than 1.0, 1.2 Exceeding this is not preferable because the mutual interference becomes too large and the deterioration on the center belt side is accelerated.

  As shown in FIG. 3, the block 2 is an insert material 42 embedded in a resin material 41. The insert material 42 is an insert material that is a part that gives the side pressure resistance and bending rigidity of the block 2. Examples of the materials include aluminum alloys, ceramics, composite materials of ceramics and aluminum, 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 lateral pressure resistance and bending rigidity, and it is preferable to use the block 2 in which a predetermined portion of the insert material 42 is coated with the resin material 41.

  When the resin material 41 is arranged at a predetermined location, if an insert material 42 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 41, the resin material 41 is partially It can be said that a preferable embodiment is obtained because problems such as peeling of the resin material are less likely to occur than those in which 41 is disposed. However, even if it is the entire surface, the portion where the insert material 42 is exposed when the member fixing the insert material 42 is in contact with the resin material 41 during the manufacturing process will be generated, It can be said that such exposure of the insert material 42 is included in a form in which the entire surface is substantially covered with the resin material.

  The resin material 41 covering the insert material 42 has a relatively large friction coefficient and excellent wear resistance, and has a higher rigidity than the elastomer 2 constituting the center belt 4, specifically having a hardness of 90 ° JIS A or higher. Hard rubber, 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 , Rubbers such as polyimide (PI) resin, polyether sulfone (PES) resin, polyether ether ketone (PEEK) resin, and synthetic resins are used.

  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.

  Further, as the block 2, a block made only of the resin material 41 can be used. When the block 2 in which the insert material 42 is not embedded is used, the weight can be reduced as compared with the belt using the block in which the insert material 42 is embedded. However, it is suitable for high-speed applications with relatively light loads such as motorcycles.

  Here, the insert material 42 refers to a frame-like material that has almost the shape of a block. For example, adding a reinforcing material such as a short fiber or whisker added in a synthetic resin material is an insert. It does not mean that the material 42 is embedded.

  The resin that can be used as the resin of the block 2 is the same as the resin material used for the block 2 in which the insert material is embedded, 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. A synthetic resin such as is used.

  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, by using a combination of nylon 46 and carbon fiber, which is a preferable example of the resin constituting the block, the carbon fiber can improve the water absorption defect of nylon 46 and greatly improve the rigidity. In addition, the wear resistance, impact resistance, and fatigue resistance of nylon 46 can be utilized. Of the carbon fibers, PAN-based carbon fibers are preferably used. Moreover, the toughness of a block improves by mix | blending an aramid fiber in combination with a carbon fiber, and abrasion resistance and impact resistance can be improved further.

  Moreover, you may mix | blend inorganic fibers, such as a zinc oxide whisker, a potassium titanate whisker, an aluminum borate whisker other than said organic fiber as said fibrous reinforcement.

  By adopting such a material structure, it has strength such as rigidity and toughness that can sufficiently withstand the side pressure received when it comes into contact with the pulley, has excellent wear resistance, and further, with respect to heat generated during friction. The power received from the pulley can be efficiently transmitted as a tensile force to the center belts 3a and 3b, and a tension transmission type high load transmission belt can be configured.

  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. .

  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.

  FIG. 6 is an example of another belt, and a pair of side pillars 32 and 33 extend upward from both ends of the beam portion 31. 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.

  As described above, in the present invention, in short, in the fitting groove into which the center belts 3a and 3b and the center belts 3a and 3b are inserted, the groove portions 19 provided on the lower surfaces of the center belts 3a and 3b and the convex portions on the block side. It is only necessary to have the above-described configuration in the engagement of 21, and the shape of the block itself is not particularly limited. Therefore, it can be applied to a belt that has a fitting groove on the side of the block and fits the center belt from the side, or a belt that is sandwiched between a pair of upper and lower blocks and fixed with a fastening material. is there.

  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 front view of a block. It is a side view which shows the engaging part of a block and a center belt. It is a principal part side view explaining the circular arc part of a protruding item | line part, and the circular arc part of a groove part. It is a principal part perspective view which shows the example of another belt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High load power transmission belt 2 Block 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 Convex part 18 Side wall 19 Convex part Part 20 Groove part 21 Groove part R ₁ arc part R ₂ arc part R ₃ arc part R ₄ arc part

Claims (2)

  An endless center belt in which a core wire is embedded in an elastomer, and a block in which a plurality of the belts are fitted and arranged in the longitudinal direction of the center belt. A groove is provided at least on the upper surface of the center belt, and the groove and the block. In the high-load transmission belt that engages the protruding portion provided in the fitting groove, the radius of curvature of the arc portion forming the protruding portion portion provided in the fitting groove of the block is the groove on the upper surface of the center belt. A high-load transmission belt characterized by being set to be larger than a radius of curvature of an arc portion forming a part. The curvature radius of the circular arc part which forms the protrusion part tip provided in the fitting groove of a block is set larger than the curvature radius of the circular arc part which forms the groove part bottom of the center belt upper surface. High load transmission belt.

Images