JP2006090542A - High-load driving belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long-life, high-load driving belt free from a failure occurring when a center belt breaks due to wear and comes to an end of its life by suppressing movement of the center belt and a block in the belt width direction to reduce friction between them. <P>SOLUTION: The high-load driving belt 1 comprises the center belt 3 and the block 2 constituted by joining an upper beam 11 and a lower beam 12 by a pillar 13 and having insertion groove 8, 9 surrounded by the beams 11 and 12 and the pillar 13 for inserting the center belt 3. At least one of the upper beam and the lower beam has a suppressing part 14 provided on its tip end protruding to the other beam side, and the center belt is prevented from moving toward the belt side face by the suppressing part 14 when the center belt 3 is fitted in the engagement groove. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high load transmission belt in which a plurality of blocks are fixed along the longitudinal direction of the center belt, and more specifically, by suppressing relative movement in the belt width direction between the center belt and the block. The present invention relates to a long-life, high-load transmission belt that prevents loosening of fitting with a block.

  The belt used in the belt type continuously variable transmission is used by being wound around a transmission pulley that changes the effective diameter of the pulley by adjusting the V groove width of the pulley and adjusts the transmission gear ratio. Because the side pressure from the belt increases, the belt must withstand a large side pressure. In addition to continuously variable speed applications, it is necessary to use a belt that can withstand a high load, especially for high-load transmission applications where the life of conventional rubber belts is too short.

  Among such belts, there is a 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

  Patent Document 4 discloses a belt having a structure in which a single center belt is surrounded by a block.

  Patent Document 5 discloses a block having a groove into which two center belts are fitted. The belt has a structure in which the center belt is fitted into the groove and is sandwiched between blocks made of upper and lower members and fixed with a rivet or the like. ing.

Japanese Patent Laid-Open No. 63-34342 Japanese Patent Laid-Open No. 62-151646 Japanese Patent Laid-Open No. 9-25999 JP-A-63-3318345 JP 61-103033 A

  A belt in which two center belts such as Patent Document 1 are mounted so as to protrude from the side surface of the block can prevent sound generation but generate heat when the center belt comes into contact with the pulley and rubs. It cannot be said that it is a very preferable form.

  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, in addition to the stress applied when the center belt restrained by the block is bent, movement of the center belt with respect to the block of the center belt occurs while the belt is running, causing deformation and wear of the block and center belt, and heat generation. Cause problems. If deformation or wear occurs at the place where the two are fitted, the posture control of the block during belt running cannot be performed, and the wear is further promoted to damage the center belt, leading to a belt failure.

  In the belt structure as in Patent Document 4, the center belt is restrained from the top, bottom, left and right by the block, and the center belt does not move with respect to the block. However, there is only one center belt, and there remains anxiety in terms of durability against high loads.

  The belt as in Patent Document 5 has two center belts and the center belt is restrained from the entire surface by the block, and there is no problem that the center belt moves with respect to the block, but the center belt is attached to the block. At this time, the center belt is sandwiched between the upper and lower blocks and fixed with a fixing tool such as a rivet, which causes a problem that it takes time to assemble the belt.

  Therefore, in the present invention, the center belt is a type of belt that is fitted in a fitting groove that opens to the side of the block, and wear due to friction between the center belt and the block is suppressed by suppressing movement in the belt width direction at least. The purpose of the present invention is to provide a high-load transmission belt that relaxes and reduces heat generation, and extends the life of the belt by cutting the center belt.

  In order to achieve the above object, according to claim 1 of the present invention, a center belt in which a core body is embedded in an elastomer, and an upper beam portion and a lower beam portion are connected by a pillar, and an upper beam portion and a pillar are connected. In a high load transmission belt comprising a block having a fitting groove into which the center belt is inserted, at least one of the upper and lower beam portions is provided with a restraining portion that protrudes toward the other beam portion at the tip portion thereof. Thus, the center belt is restrained from moving in the belt side surface direction by the restraining portion with the center belt inserted into the fitting groove.

  According to the second aspect of the present invention, a high load transmission belt is provided in which the suppressing portion is provided only in the upper beam portion.

  In Claim 3, it is set as the high load power transmission belt whose protrusion height of a control part is the range of 0.3-0.6 mm.

  According to a fourth aspect of the present invention, the side surface of the suppressing portion is located inward of the plane formed by the side surface of the block, and is a high load transmission belt configured so as not to contact the pulley during belt running.

  According to a fifth aspect of the present invention, the side surface of the restraining portion has an inclination inward toward the tip of the restraining portion with respect to the plane formed by the side surface of the block, while the contact surface of the restraining portion with the center belt is the center. The belt is a high-load transmission belt having a surface along the belt, which makes it easy to insert the center belt into the block and to prevent it from coming off.

  According to the sixth aspect of the present invention, the thickness of the restraining portion in the belt longitudinal direction is a high load transmission belt that is set smaller than the thickness of the beam portion provided with the restraining portion.

  By suppressing the movement of the center belt and the block in the belt width direction, friction between the two is reduced, and it is possible to prevent a failure such that the center belt is cut due to wear and the life of the belt is shortened. A long-life high load transmission belt can be obtained.

  By providing the suppressing portion only in the upper beam portion, the width of the center belt can be set wider, and the center belt can be inserted relatively easily.

  Moreover, by making the protrusion height of the restraining portion within an appropriate range, it is not difficult to insert the center belt into the fitting groove, and the movement of the center belt with respect to the block in the belt width direction is restrained. Can do.

  By preventing the side surface of the restraining portion from coming into contact with the pulley when the belt is running, the block is unlikely to come out of the pulley, and the sound generation increases or the belt shakes, thereby reducing the durability of the belt.

  By tilting the side of the restraining part toward the inside of the block, it becomes easy to insert the center belt into the block when assembling the belt, while the contact surface of the restraining part with the center belt is the side of the center belt. The center belt is pressed against the center belt and is in close contact with the center belt so that the center belt is not easily removed from the block.

  By setting the thickness of the restraining part to be smaller than the thickness of the upper beam part or the lower beam part provided with the restraining part, the center belt can be easily inserted into the block, and the restraining part comes into contact with the pulley during belt running. Even in this case, the influence can be reduced, and the increase in sound generation and belt vibration when the block comes out of the pulley can be mitigated.

  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.

  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.

  The upper beam portion 11 is provided with a guide convex portion 21, and a guide concave portion 22 that is fitted to the guide convex portion 21 is provided on the opposite surface. In this way, by engaging the projections and depressions before and after the moving direction of the blocks, a plurality of blocks 2 can be aligned, which improves transmission efficiency and prevents noise.

  Further, as shown in FIG. 3, a suppression portion 14 that protrudes toward the lower beam portion 12 is provided at an end portion of the upper beam portion 11. The center belt 3 has a width from the base of the upper and lower beam portions 11 and 12 to the suppression portion 14, and when the center belt 3 is fitted in the fitting grooves 8 and 9, the side surface 3 a of the center belt comes into contact with the suppression portion 14. Therefore, after that, movement in the belt width direction in the fitting grooves 8 and 9 is suppressed. By adopting such a configuration, friction between the two is reduced, and it is possible to prevent a failure such that the center belt is cut due to wear and the belt becomes a service life.

  The protrusion height h from the upper beam part 11 of the suppression part 14 shall be the range of 0.3-0.6 mm. If it is less than 0.3 mm, the center belt can easily get over the restraining part, and the effect of suppressing the movement of the center belt in the belt width direction cannot be sufficiently obtained. Since it becomes difficult to insert the groove, it is not preferable.

  Although the example which provided the suppression part 14 in the upper beam part 11 was demonstrated above, the suppression part 14 should just be provided in at least one of the upper and lower beam parts 11 and 12, and may be provided in both beam parts. Good. However, since the lower beam portion 12 is originally shorter than the upper beam portion 11, if the structure in which the lower beam portion 12 is provided with the suppression portion 14, the width of the center belt 3 becomes narrower, which is disadvantageous in terms of strength. Since the insertion work is difficult if the lower beam portion 12 is provided with the restraining portion 14 even when the insertion grooves 8 and 9 are inserted into the fitting grooves 8 and 9, the configuration in which only the upper beam portion 12 is provided is a preferred mode. is there.

  FIG. 4 is a side view of a block showing another example of the present invention. In the block 2 shown in FIG. 4, the thickness t in the belt longitudinal direction of the suppressing portion 14 is set to be smaller than the thickness T of the block 2, so that when the belt travels, the block including the suppressing portion 14 is a pulley. The area in contact with is reduced. Providing the suppression unit 14 increases the contact area with the pulley, makes it difficult for the belt to come out of the pulley, and can alleviate the increase in sound generation and the vibration of the belt. In this case, it is preferable to set the thickness t of the suppressing portion within a range of 35 to 70% of the thickness T of the block. If it is less than 35%, the strength of the restraining portion 14 may be insufficient, leading to breakage. If it exceeds 70%, the influence on sound generation and belt vibration will increase.

  FIG. 5 is a sectional view of a belt showing another example of the present invention. In the block shown in FIG. 5, the side surface 14 a of the suppressing portion 14 becomes a surface having an angle toward the inside where the block center is located with respect to the plane forming the side surfaces 6 and 7 of the block 2 as it goes beyond the suppressing portion 14. Yes. By doing so, the restraining portion 14 does not come into contact with the pulley during belt running, so even if the restraining portion 14 is provided, the relationship between the pulley and the block is not affected. Furthermore, the operation of inserting the center belt 3 into the block is easy to perform. On the other hand, if the surface 14b of the restraining portion 14 that contacts the center belt 3 is a surface along the side surface 3a of the center belt such that the surface 14b is oriented in a direction perpendicular to the block, the center belt 3 that has been once inserted is difficult to come off.

  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.

  Although not shown, the block 2 may be one in which the surface of an insert material having substantially the same letter shape as that of the block is coated with a resin material, and the insert material is a part that gives the side pressure resistance and bending rigidity of the block 2. The material is an insert material, and examples of the material 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 side 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 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.

  Also, the block 2 can be made of only a resin material. 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 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, 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. In addition, a polyamide with a low coefficient of friction, excellent wear resistance, rigidity, elasticity against bending, and a resin that does not easily break can be used. 46 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, 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. 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 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 sectional side view of the high load transmission belt of this invention. It is a longitudinal section of the high load power transmission belt of the present invention. It is a side view of the block which shows another example. It is sectional drawing of the belt using the block shown in FIG.

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 11 Upper beam part 12 Lower beam part 13 Center pillar 14 Control part 15 Concave part 16 Concave part 17 Convex section 18 Convex section

Claims (6)

  A center belt in which a core body is embedded in an elastomer, and a block having a fitting groove for inserting the center belt surrounded by the upper and lower beam portions and the pillar by connecting the upper beam portion and the lower beam portion by pillars. In a high-load transmission belt, at least one of the upper and lower beam portions is provided with a restraining portion that protrudes toward the other beam portion at the tip, and the center belt is restrained while the center belt is inserted into the fitting groove. A high-load transmission belt, characterized in that the belt is restrained from moving in the lateral direction of the belt by a portion.   The high-load transmission belt according to claim 1, wherein the suppressing portion is provided only in the upper beam portion.   The high-load transmission belt according to claim 1 or 2, wherein a protrusion height of the suppressing portion is in a range of 0.3 to 0.6 mm.   The high load transmission belt according to claim 1, wherein the side surface of the suppressing portion is located inward of a plane formed by the side surface of the block, and is configured not to contact the pulley during belt running.   The side surface of the restraining portion has an inward inclination toward the tip of the restraining portion with respect to the plane formed by the side surface of the block, while the contact surface of the restraining portion with the center belt is along the side surface of the center belt. The high-load transmission belt according to claim 1, wherein the belt has a surface and is configured such that the center belt can be easily inserted into the block and is not easily removed. The high load transmission belt according to claim 1, wherein the thickness of the restraining portion in the longitudinal direction of the belt is set smaller than the thickness of the beam portion provided with the restraining portion.

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