JP4694248B2 - High load transmission belt - Google Patents

Description

  The present invention relates to a high-load transmission belt in which a block is fixed at a predetermined pitch along the longitudinal direction of a center belt, and the block.

  Since the belt used in the belt type continuously variable transmission is used for a transmission pulley that changes the effective diameter wound around the pulley by changing the V groove width of the pulley and adjusts the transmission ratio, Since the side pressure of 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 tensile transmission type high-load transmission belt in which a block is fixed to the center belt to increase the strength in the belt width direction. A block made of a relatively hard resin material or the like is fixed to a center belt embedded in an elastomer such as a bolt or a rivet using a fixing material.

  The required quality of such a high load transmission belt block is, as described above, for the purpose of high load transmission in friction transmission, so bending fatigue, wear resistance, heat resistance, rigidity, impact resistance, etc. It is necessary to have a balanced nature. Another important factor is not to wear the pulley.

  As a high load transmission belt using these blocks, for example, there is a belt disclosed in Patent Document 1. This belt uses a double-structured block in which the part where the block and pulley come into contact is coated with an insert material made of metal or the like by a resin molding material in which a rubber component is added to a phenolic resin component. It is.

  Patent Document 2 discloses a belt in which a fiber reinforcing material and zinc oxide whisker are blended with a thermoplastic resin such as polyamide.

Japanese Patent Laid-Open No. 63-34342 JP 2001-31453 A

  If the belt has a metal insert material such as aluminum embedded in the resin as disclosed in Patent Document 1, the weight of the block is inevitably increased due to the presence of the insert material. The centrifugal tension of inevitably becomes large. Then, on the side of the driving device that runs the belt, it is necessary to increase the axial load and the rigidity of the pulley, so that the entire driving device tends to be large and expensive. There is a disadvantage that it is difficult to downsize. There is also a disadvantage that it is not suitable for high-speed rotation.

  In the belt as disclosed in Patent Document 2, the block is made of a resin such as polyamide, and the insert material is not embedded, so the weight of the block is relatively light, and the centrifugal tension during belt running Therefore, the shaft load and pulley rigidity required for the belt drive device that drives the belt can be moderate, and it can be made inexpensive and suitable for high-speed rotation. For example, it can be applied to an engine having a small displacement and a high rotational speed.

  However, a resin material in which zinc oxide whisker is blended with a thermoplastic resin such as polyamide may easily wear the mating material that comes into contact with the resin material in which the portion contacting the center belt of the block is blended with zinc oxide whisker. In this case, there is a problem that the center belt is worn quickly and the belt is cut.

  The present invention has been made in view of the above-mentioned problems, has sufficient strength, does not significantly wear the center belt due to friction with the block, and does not block the block even under high rotation and high temperature environments. The purpose of the present invention is to provide a tension transmission type high load transmission belt that has few problems such as wear and can satisfy the requirements of a high load transmission belt at a high level.

In order to solve the above problems, the high load transmission belt according to claim 1 of the present invention is a high load transmission belt comprising a center belt and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt. A thermoplastic resin composition A containing no zinc oxide whisker is disposed on the contact surface with the center belt of the block, and a thermoplastic resin composition containing a fiber reinforcing material and zinc oxide whisker on the contact surface with the pulley. B is arranged, and the ratio of the thermoplastic resin composition A in the total area of the contact surface with the center belt of the block and the thermoplastic resin in the total area of the contact surface with the pulley of the block The proportion of the composition B is 70% or more, respectively.

  In claim 2, the thermoplastic resin composition A is a high load transmission belt formed by blending 1 to 60% by mass of a fiber reinforcing material with respect to the thermoplastic resin.

In claim 3, the thermoplastic resin composition B is a high load transmission belt in which 1 to 30% by mass of zinc oxide whisker and 1 to 60% by mass of fiber reinforcing material are blended with respect to the thermoplastic resin.

  In claim 4, the thermoplastic resin composition A and the thermoplastic resin composition B used in the thermoplastic resin composition B are high load transmission belts in which a polyamide resin is used.

In claim 1, the block contact surface with the center belt is basically the thermoplastic resin composition A not containing zinc oxide whisker, and the surface sliding in contact with the pulley is heat containing zinc oxide whisker. Since the plastic resin composition B is used, the center belt is not worn by friction with the block, and the contact surface with the pulley of the block is excellent in wear resistance and can maintain performance over a long period of time. It can be a transmission belt.

In Claims 2 and 3, the blending ratio of the zinc oxide whisker and the fiber reinforcing material in the thermoplastic resin composition A and the thermoplastic resin composition B is limited, and the physical properties such as block strength, wear resistance, and toughness are limited. The belt is set so as to have the most suitable balance for use as a belt, and the belt can be excellent in transmission efficiency and durability.

  In the fourth aspect, polyamide is used as the thermoplastic resin, which has high bending strength and bending elastic modulus and is strong, and has an advantage that it is difficult to break even when a load is applied to the block and the belt.

  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.

In the present invention, the thermoplastic resin composition A not containing zinc oxide whisker is disposed on the contact surface with the center belt of the block, and the fiber reinforcing material and zinc oxide whisker are blended on the contact surface with the pulley. The thermoplastic resin composition B is arranged, and the ratio of the thermoplastic resin composition A in the total area of the contact surface with the center belt of the block and the total area of the contact surface with the pulley of the block The ratio of the thermoplastic resin composition B is 70% or more.

In short portions basically in contact with the center belt is composed of a thermoplastic resin composition A not blended zinc oxide whiskers in block 2, a zinc oxide whisker portion in contact with the pulley and the fiber reinforcement during belt travel That is, it is composed of the blended thermoplastic resin composition B. In addition, it is allowed to arrange other than the limit of less than 30% in the total area. An example of such a block 2 is given below.

  As shown in FIG. 1, the shape of the block 2 includes an upper beam portion 11 and a lower beam portion 12, and a center pillar 13 that connects the central portions of the upper and lower beam portions 11 and 12. Are formed with grooves 14 and 15 into which the center belts 3a and 3b are fitted. Further, on the groove upper surface 16 and the groove lower surface 17 in the groove 15, convex ridges 20, 21 that engage with a concave ridge 18 provided on the upper surface 6 of the center belt 3 a, 3 b and a concave ridge 19 provided on the lower surface 7. Is provided.

  FIG. 2 shows an example of another belt. A pair of side pillars 32 and 33 extend upward from both ends of the beam portion 31, and the upper ends of the side pillars 32 and 33 respectively extend toward the center of the block 2. 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.

  The block 2 has a structure in which the surface of the insert material 2a made of the thermoplastic resin composition A is covered with a coating material 2b made of the thermoplastic resin composition B as shown in FIGS. FIG. 3 shows a block 2 used in the belt shown in FIG. 1, in which a substantial part of the insert material 2a is covered with a covering material 2b. FIG. 4 shows a block 2 used in the belt shown in FIG. 2, and the covering material 2b has a configuration in which the fitting groove 30 of the center belt 3 is not completely covered with the covering material 2b.

  The insert material 2a usually has a substantially block shape by itself, and is a portion that bears the main part of the physical properties of the block. The covering material 2b has a thickness of about 0.1 to 0.5 mm, for example, and a belt It covers the surface of the insert material 2a at a portion that contacts the pulley when traveling and a portion where adjacent blocks contact each other. The covering material 2b may cover only the portion where the friction is generated. Even if it is any form, in this invention, the area covered with the coating | covering material is less than 30% among the areas which contact a center belt in the fitting groove of the center belt of a block.

Examples of the thermoplastic resin composition A used for the insert material 2a include polyamide resins such as nylon 46, nylon 6, nylon 66, nylon 6T, nylon 9T, other polyphenylene sulfide, polyether ether ketone, etc. A composition in which a fiber reinforcement composed of carbon fiber, polyamide fiber, cellulose, cotton, aramid fiber, polyparaphenylene benzobisoxazole fiber, polyarylate fiber, glass fiber, metal fiber, etc. It is. Among these fiber reinforcing materials, it is preferable to use carbon fiber because it has the effect of reinforcing the strength of the resin and lowering the friction coefficient. However, zinc oxide whisker is not blended. Since a resin composition containing zinc oxide whisker greatly wears the mating material by rubbing, it is not preferable to use it at a site in contact with the center belt because the center belt is worn and causes early cutting.

  The strength and rigidity of the resin can be increased by blending the fiber reinforcing material, and the blending amount of the fiber reinforcing material to the resin is preferably in the range of 1 to 60% by mass. If it is less than 1% by mass, almost no reinforcing effect is obtained by blending the fibers. If it exceeds 60% by mass, molding becomes difficult and the hardness increases, but the toughness decreases and the impact resistance of the block decreases. Then, it is not preferable because it becomes low.

  The covering material 2b forms a contact surface with the pulley when the belt travels, and the thermoplastic resin composition B used as the covering material 2b is a polyamide such as nylon 46, nylon 6, nylon 66, nylon 6T, nylon 9T or the like. Resins, other polyphenylene sulfides, polyether ether ketones, etc. can be mentioned, such as carbon fiber, polyamide fiber, cellulose, cotton, aramid fiber, polyparaphenylene benzobisoxazole fiber, polyarylate fiber, glass fiber, metal It is a composition in which a fiber reinforcing material composed of long fibers such as fibers, short fibers, and whiskers are blended.

  By mix | blending a fiber reinforcement, intensity | strength and rigidity can be improved and it mix | blends in 1-60 mass% with respect to a thermoplastic resin. If it is less than 1% by mass, almost no reinforcing effect is obtained by blending the fibers. If it exceeds 60% by mass, molding becomes difficult and the hardness increases, but the toughness decreases and the impact resistance of the block decreases. Then, it is not preferable because it becomes low.

In addition, the zinc oxide whisker can be greatly improved in wear resistance by being blended with the thermoplastic resin, and an effect of preventing the wear of the covering material 2b that moves with the pulley can be obtained . Acid zinc whiskers has a three-dimensional shape of the hand is extended in four directions to tetrapod shape, which alone heat resistance, but is excellent in abrasion resistance, tetrapod-like three-dimensional, as described above specifically the shape has a, is blended with the fiber reinforcement, the orientation of the fiber reinforcement is suppressed, the anisotropy of the warp and molding shrinkage during molding Ru improved. Further, since the orientation of the fiber reinforcement can be reduced in this way, the anisotropy of strength such as the toughness and bending rigidity of the block 2 can be reduced, and the friction coefficient is stabilized, so that the wear resistance is improved. To do. Moreover, since the zinc oxide whisker has a high specific gravity and high rigidity, it is possible to reduce the vibration at the time of contact with the pulley and to expect the effect of reducing the generation of noise.

The blending amount of the zinc oxide whisker with respect to the thermoplastic resin is blended in the range of 1 to 30% by mass. If it is less than 1% by mass, the effect of improving the wear resistance is low, which is not preferable. On the other hand, if it exceeds 30% by mass, it is difficult to blend and unfavorable moldability.

Thus blocks used in heavy duty power transmission belt of the present invention consists of two thermoplastic resin composition B obtained by blending zinc oxide whiskers and the thermoplastic resin composition A not blended zinc oxide whiskers. As described above, the resin composition containing the zinc oxide whisker greatly wears the mating material by friction, so there is a problem of causing the center belt to wear and causing early cutting when used in a portion in contact with the center belt. In the present invention, the proportion of the covering material made of the thermoplastic resin composition B in the area of the block in contact with the center belt is less than 30%. By doing so, it is possible to prevent the problem that the center belt wears due to friction with the block and leads to cutting, and since the surface in contact with the pulley is made of the thermoplastic resin composition B, the life due to block wear is reduced. It can be extended.

  Because it is made of resin by adopting the block configuration as described above, it can be made lighter than conventional inserts made of metal materials such as aluminum, so it can be used at high speeds. Also, the centrifugal tension can be kept low. Further, since the thermoplastic resin is used, the block has toughness and is not easily cracked against impact.

In addition to the fiber reinforcement and the zinc oxide whisker, 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. .

  5 and 6 are front views of the block 2 showing another embodiment. In the case of this block 2, the upper beam portion 11 of the insert material 2a has a through hole 40, and the through hole is shown in FIG. As shown in FIG. 7, at 40, the covering materials 2b on the front and back surfaces of the insert material 2a are connected. By adopting such a configuration, the fixing force of the covering material 2b to the insert material 2a can be increased, and a belt failure due to the peeling of the covering material 2b can be prevented.

  The covering material 2b may cover many parts of the insert material 2a other than the part contacting the center belt of the block, but it is sufficient that it covers at least the contact surface of the block 2 with the pulley, I do not care. Further, the partial covering can increase the proportion of the insert material 2a in the block 2 and is advantageous in terms of strength, but conversely, the covering material 2b is peeled off. The strength of the block can be increased without worrying about the problem of peeling of the covering material 2b by connecting the covering material 2b on the front and back surfaces through the through holes 40 provided in the insert material 2a as described above.

  In the above example, the covering material 2b is connected to the front and back surfaces of the insert material 2a by providing a through-hole in the insert material 2a. The adhering force of the material 2b to the insert material 2a can be increased. Similar effects can be obtained by providing not only the recesses but also the protrusions or both the recesses and protrusions.

  Further, the fixing force can be further improved by interposing an epoxy adhesive or the like between the insert material 2a and the covering material 2b.

  Although the example so far was the form which coat | covers the insert material made from the thermoplastic resin composition A with the thermoplastic resin composition B, what is shown in FIG. 8 is another form of a block. The block main body 50 made of the resin composition A is composed of the upper and lower beams 11 and 12 and the pillar 13 connecting them at the center, and is thermoplastic in the hole 51 provided at the end of the upper and lower beams 11 and 12 which are the side surfaces of the block. A contact member 52 with a pulley made of the resin composition B is inserted and arranged. Thus, the thermoplastic resin composition B does not necessarily have to cover the insert material made of the thermoplastic resin composition A.

  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. 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 wire 5 may be made of a woven fabric, knitted fabric, metal thin plate, or the like of the above-mentioned fiber other than a rope embedded in a spiral shape.

  Next, a high load transmission belt according to the present invention was manufactured as shown in Table 1, a belt running test was performed, the occurrence of cracks in the block was observed, and the amount of wear on the side of the block was measured. The looseness between the belt and the belt was observed.

  In addition, the used high load transmission belt used the block as shown in FIG. 1, and changed the insert material of the block and the material of a coating | covering material as shown in Table 1, Example, Comparative example 1 High load transmission belt. In Comparative Example 2 and Comparative Example 3, the insert material was not covered with a covering material, but a block made of one kind of resin was used.

  The center belts 3a and 3b used were all in common, the core wire 5 was aramid fiber, and the elastomer 4 was chloroprene rubber. The belt size is 18 mm, the pitch circumference is 831 mm, and the block pitch is 3 mm for Example, Comparative Example 2 and Comparative Example 3, and the belt pitch width is 25 mm, the pitch circumference is 612 mm, and the block pitch is 3 mm only for Comparative Example 1. did.

  As the thermoplastic resin composition A, nylon 46 (DJEP Stanyl) blended with 30% by mass of carbon fiber short fibers (Toho Tenax HTA-C6-NRS) was used. As the thermoplastic resin composition B, nylon 46 (DJEP Stanyl) is blended with 30% by mass of carbon fiber short fibers (HTA-C6-NRS manufactured by Toho Tenax Co.), and zinc oxide whisker (Matsushita Amtec Co., Ltd.). What mix | blended 15 mass% of Panatetra WZ-0511) was used. As a thermosetting resin composition, what mixed 50 mass% of PAN type | system | group carbon fiber and 15 mass% of graphite with respect to diallyl phthalate resin (Fudo Co., Ltd. Dapol) was used.

  The amount of wear on the side of the block was measured with a projector by removing the block from the belt after running. The above results are summarized in Table 1.

As can be seen from Table 1, Example 1
Even if it runs for 200 hours, no abnormality occurred, the block did not crack, the amount of wear was small, there was no looseness between the block and the center belt, and zinc oxide whisker was blended The thermoplastic resin composition A and the thermoplastic resin composition B blended with zinc oxide whisker are selectively used for the insert material and the coating material, and the thermoplastic resin composition A is used as a pulley at the contact portion with the center belt. The effect which arrange | positioned the thermoplastic resin composition B is recognized by this contact site.

  On the other hand, in Comparative Example 1, although the wear of the block is small, looseness occurs between the block and the center belt, and the life is reached by cutting the belt at an early stage. This is probably because the belt is heavy and a large centrifugal force is applied to the center belt.

  In Comparative Example 2, since the blocks are all made of resin, the blocks are light and can run for 200 hours without any abnormality, but the wear amount of the blocks is large.

  Since all of Comparative Example 3 is made of resin, the centrifugal force is small and the vehicle travels for 200 hours. However, when the block is observed, cracks are generated in some places and the center belt is worn and loosened. . This will eventually lead to problems such as cutting the center belt.

Above results, selectively using a thermoplastic resin composition not blended zinc oxide whiskers and the thermoplastic resin composition A was blended with zinc oxide whiskers B as in the present invention in the insert material and the coating material, the center belt Even when the thermoplastic resin composition A is disposed at the contact portion with the pulley, and the thermoplastic resin composition B is disposed at the contact portion with the pulley, the block has sufficient strength even when rotating at a high speed. It can be seen that it is possible to provide a high load transmission belt with less problems such as block wear even in a high temperature environment in which the center belt is not greatly worn by friction.

  It is a belt that can transmit high loads used for driving automobiles, motorcycles such as scooters, and agricultural machinery.

It is a perspective schematic diagram showing an example of the high load transmission belt concerning the present invention. It is a perspective schematic diagram showing other examples of the high load power transmission belt concerning the present invention. It is a front view of the block concerning a belt in FIG. FIG. 3 is a front view of a block according to the belt in FIG. 2. It is a front view which shows another example of a block. It is a front view which shows another example of a block. It is principal part sectional drawing which shows a through-hole part. It is a front view which shows another example of a block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High load power transmission belt 2 Block 2a Insert material 2b Cover material 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 Projection Part 19 Projection part 20 Groove part 21 Groove part 40 Through hole

Claims (4)

In a high load transmission belt comprising a center belt and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, thermoplasticity in which zinc oxide whisker is not blended on the contact surface of the block with the center belt The resin composition A is arranged, and the thermoplastic resin composition B containing the fiber reinforcing material and the zinc oxide whisker is arranged on the contact surface with the pulley, and the total area of the contact surface with the center belt of the block The ratio of the thermoplastic resin composition A and the ratio of the thermoplastic resin composition B in the total area of the contact surface with the pulley of the block is 70% or more, respectively. Load transmission belt. The high load transmission belt according to claim 1, wherein the thermoplastic resin composition A is formed by blending 1 to 60 mass% of a fiber reinforcing material with respect to the thermoplastic resin. The high-load power transmission belt according to claim 1 or 2, wherein the thermoplastic resin composition B contains 1 to 30% by mass of zinc oxide whisker and 1 to 60% by mass of a fiber reinforcing material with respect to the thermoplastic resin. The high load power transmission belt according to claim 1, wherein the thermoplastic resin used for the thermoplastic resin composition A and the thermoplastic resin composition B is a polyamide resin.

Images