JP2008208995A - High-load transmission belt and block for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt having a long service life and reduced in friction quantity in a contact surface with a pulley, maintaining mechanical strength such as rigidity of a block. <P>SOLUTION: This high-load transmission belt 1 is formed of a plurality of blocks provided at a predetermined pitch along the longitudinal direction of a center belt 3. The block 2 is formed of a resin composition obtained by blending a fiber reinforcing material such as a carbon fiber and an aramid fiber in a thermoplastic resin having Tg (glass transition temperature) at 100°C or more, and the thermoplastic resin of 40-90 mass% and the fiber reinforcing material of 10-60 mass% in relation to the total quantity of the resin composition are blended. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  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 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 an elastomer that is relatively harder than the elastomer used for the center belt is fixed to the center belt embedded in the elastomer using a fixing material such as a bolt or a rivet.

  As the block, a metal core material such as aluminum whose surface is coated with a resin has been proposed (Patent Document 1). However, due to diversification of needs, the load is somewhat low, but the rotation speed is high and the pulley diameter is small. A block having a metal core material inevitably increases the weight of the core material, and when the belt is run at a high speed, there is a problem that the centrifugal tension increases and the belt is damaged early.

  Therefore, a belt using a block made only of a resin material without using a core material has been proposed. Since Patent Document 2 reinforces a thermoplastic resin such as 4,6-nylon by blending PAN-based carbon fibers and whiskers, it can resist lateral pressure without being embedded, and is lightweight. It is described that the centrifugal tension during the running of the belt is small and the belt can be prevented from being damaged.

  Patent Document 2 describes that various whiskers are blended.

Japanese Patent Laid-Open No. 10-73149 JP 2001-31453 A

  By using a resin reinforced with fibers or whiskers as described above, the wear resistance and rigidity of the block can be increased. However, if the belt is run for a long period of time, block wear will occur, and there will be a problem that the transmission ratio will be reduced due to the effect of gear ratio and slip, and further improvement of wear resistance is desired. ing.

  In view of the above circumstances, an object of the present invention is to provide a belt capable of reducing the amount of wear without greatly reducing the strength such as wear resistance and rigidity at the contact surface of the block with the pulley.

  In order to achieve the above object, according to claim 1 of the present invention, a center belt in which a core is embedded in an elastomer, and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt. In the high load transmission belt, the block is made of a resin composition in which at least a fiber reinforcing material is blended with a thermoplastic resin. The thermoplastic resin is 40 to 90% by mass with respect to the total amount of the resin composition, and the fiber reinforcing material is It mix | blends in the ratio of 10-60 mass%, It is characterized by the above-mentioned.

  The high load transmission belt according to claim 1, wherein the thermoplastic resin has a Tg of 100 ° C. or higher, or a heat deformation temperature at a load of 1.82 MPa in accordance with JIS K7191 is 120 ° C. or higher.

  According to a third aspect of the present invention, the high load transmission belt according to the second aspect is formed by using a polymer alloy made of at least two kinds of resins as the thermoplastic resin.

  In Claim 4, it is set as the high load power transmission belt of Claim 3 which uses the polymer alloy which consists of a polyamideimide and a polyphenylene sulfide.

  According to a fifth aspect of the present invention, the high load transmission belt according to any one of the first to fourth aspects, wherein the fiber reinforcing material is carbon fiber.

  In claim 6, in a high load transmission belt block used for a high load transmission belt comprising a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, a resin in which at least a fiber reinforcing material is blended with a thermoplastic resin It consists of a composition, The thermoplastic resin is 40 to 90 mass% with respect to the whole quantity of this resin composition, The fiber reinforcement consists of a resin composition mix | blended in the ratio of 10 to 60 mass%, It is characterized by the above-mentioned.

  In Claim 7, it is set as the block for high load transmission belts of Claim 6 whose Tg of a thermoplastic resin is 100 degreeC or more, or the heat deformation temperature in the load 1.82MPa based on JISK7191 is 120 degreeC or more.

  In Claim 8, it is set as the block for high load transmission belts of Claim 7 which uses the polymer alloy which consists of at least 2 types of resin as a thermoplastic resin.

  According to a ninth aspect of the present invention, there is provided the high load transmission belt block according to the eighth aspect, wherein a polymer alloy comprising two kinds of polyamideimide and polyphenylene sulfide is used.

  The tenth aspect of the present invention is the high load transmission belt block according to the sixth to ninth aspects, wherein the fiber reinforcing material is carbon fiber.

  In claim 1, since the fiber reinforcing material is blended in the block made of the thermoplastic resin, the block is light and suitable for use at a high rotation, and the block can have sufficient strength, and the belt travels. The amount of wear of the block can be greatly reduced at the contact surface of the block with the pulley at the time.

  In claim 2, a thermoplastic resin having a Tg of 100 ° C. or higher or a heat deformation temperature of 120 ° C. or higher at a load of 1.82 MPa in accordance with JIS K7191 is used. These resins are thermoplastic resins. Among them, it is excellent in bending rigidity and fatigue resistance, and by adding carbon fiber as a reinforcing material to this, the characteristics are further improved. In particular, even when the wear surface generates heat near 100 ° C., the rigidity of the resin having a Tg of 100 ° C. or higher or a heat deformation temperature of 120 ° C. or higher at a load of 1.82 MPa according to JIS K 7191 is maintained. Less wear. Furthermore, since belts using blocks made of these resins are hung on pulleys and traveled by a pulley, there is little adhesion of the worn resin to the pulleys, so transmission performance is hardly lowered.

  In claim 3, a polymer alloy comprising at least two kinds of resins is used as the thermoplastic resin, and not only the physical properties such as the rigidity and impact strength of the block itself but also the moldability in the manufacturing process is good. At the same time, the wear resistance of the block can be maintained at a high level.

  According to the fourth aspect of the present invention, wear resistance can be further improved by using a polymer alloy composed of two types of polyamide imide and polyphenylene sulfide.

  In Claim 5, the fiber reinforcing material to mix | blend is made into carbon fiber, and sufficient intensity | strength and rigidity can be given to a block.

  In claim 6, since the fiber reinforcing material is blended in the block made of the thermoplastic resin, it is lightweight and suitable for use at high rotation, and the block can have sufficient strength, and the belt travels. The amount of wear of the block can be greatly reduced at the contact surface of the block with the pulley at the time.

  In claim 7, a thermoplastic resin having a Tg of 100 ° C. or higher or a heat deformation temperature of 120 ° C. or higher at a load of 1.82 MPa in accordance with JIS K7191 is used. These resins are thermoplastic resins. Among them, it is excellent in bending rigidity and fatigue resistance, and by adding carbon fiber as a reinforcing material to this, the characteristics are further improved. In particular, even when the wear surface generates heat near 100 ° C., the rigidity of the resin having a Tg of 100 ° C. or higher or a heat deformation temperature of 120 ° C. or higher at a load of 1.82 MPa according to JIS K 7191 is maintained. Less wear. Furthermore, since belts using blocks made of these resins are hung on pulleys and traveled by a pulley, there is little adhesion of the worn resin to the pulleys, so transmission performance is hardly lowered.

  In claim 8, a polymer alloy composed of at least two kinds of resins is used as the thermoplastic resin, and not only physical properties such as rigidity and impact strength of the block itself but also moldability in the manufacturing process is good. At the same time, the wear resistance of the block can be maintained at a high level.

  According to the ninth aspect of the present invention, wear resistance can be further improved by using a polymer alloy composed of two types of polyamideimide and polyphenylene sulfide.

  In Claim 10, the fiber reinforcement to mix | blend is made into carbon fiber, and sufficient intensity | strength and rigidity can be given to a block.

  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 view. The high-load transmission belt 1 of the present invention is fixed to two center belts 3a and 3b having the same width formed by embedding a core wire 5 in a spiral shape in an elastomer 4, and the center belts 3a and 3b. A plurality of blocks 2. 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 are locked and fixed by the center belts 3a and 3b. The power of the driving pulley is transmitted to the driven pulley.

  As shown in FIGS. 1 and 2, 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 both side surfaces 2 a and 2 b of the block 2. Are formed with grooves 14 and 15 into which the pair of center belts 3a and 3b are fitted. Further, the groove upper surface 16 and the groove lower surface 17 in the groove 15 are related to the ridge portions 20 and 21 engaged with the ridge portion 18 provided on the upper surface of the center belt 3a, 3b and the ridge portion 19 provided on the lower surface. It comes to match.

  Further, in the present invention, the material used as the block 2 is composed of a resin composition in which at least a fiber reinforcing material is blended with a thermoplastic resin. The thermoplastic resin is 40 to 90% by mass with respect to the total amount of the resin composition, and the fiber reinforcing material. Is blended at a rate of 10 to 60% by mass.

  Examples of the thermoplastic resin include nylons such as 4,6-nylon, 6-nylon, 6,6-nylon, 9, T-nylon, liquid crystal polymer, polyarylate, polyphenylene ether, polyphenylene sulfide, polyether ether ketone, Examples include polyethersulfone, polyamideimide, polyetherimide, polyimide and the like. Among these, it is preferable to use those having a Tg of 100 ° C. or higher or a heat distortion temperature of 120 ° C. or higher at a load of 1.82 MPa in accordance with JIS K7191. These resins are excellent in bending rigidity and fatigue resistance among thermoplastic resins, and their properties are further improved by adding a fiber reinforcing material. In addition, since injection molding is possible, there is an advantage that it is easier to mold the block. In particular, since the rigidity of the resin is maintained even when the wear surface generates heat up to around 100 ° C., the wear of the block is reduced. Furthermore, by using a polymer alloy composed of at least two kinds of the above-mentioned resins, various properties such as physical properties such as rigidity and impact strength of each resin alone and moldability in the block manufacturing process can be obtained. Since deficiencies in performance can be complemented with each other, there is an advantage that wear resistance can be greatly improved while maintaining rigidity, impact resistance, and good moldability. Among various combinations, a combination of polyamideimide (PAI) and polyphenylene sulfide (PPS) is preferable because of its excellent wear resistance.

  9, T-Nylon is a polyamide resin having an aromatic ring and a long-chain diamine, which is produced by polycondensation of nonanediamine and terephthalic acid, and has an aromatic ring and a higher aliphatic chain. It has sex. Further, since it is a homopolymer and has a high degree of crystallinity, it is excellent in wear resistance, impact resistance and fatigue resistance as in the case of 4,6-nylon compared to polyamide having a low degree of crystallinity. Therefore, by using this material, it is possible to obtain a block having excellent physical properties such as wear resistance, impact resistance, fatigue resistance, and bending rigidity during heating, and having few water absorption problems. As an example of the product of 9, T-nylon, “Genesta” of Kuraray Co., Ltd. can be mentioned.

  Moreover, the following are mentioned as a specific example of other resin. 6,6-Nylon: Asahi Kasei Chemicals Corporation “Leona”, 6-Nylon: Ube Industries, Ltd. “UBE Nylon”, Liquid Crystal Polymer: Shin Nippon Petrochemical Co., Ltd. “Zider”, Polyarylate: Unitika Ltd. “U-Polymer” ”, Polyphenylene sulfide: Idemitsu Kosan Co., Ltd.“ Idemitsu PPS ”, Dainippon Ink & Chemicals, Inc.“ DIC / PPS ”, polyphenylene ether: Asahi Kasei Chemicals Corporation“ Zylon ”, GE Plastics Inc.“ Noryl ”, polyethersulfur Phone: Sumitomo Chemical Co., Ltd. “Sumika Excel”, Polyetheretherketone: Victorex MC Co., Ltd. “PEEK 450G”, Polyetherimide: GE Plastics Japan “Ultem”, Polyamideimide: Solvay Advanced Polymer Co., Ltd. "Torlon", Mitsubishi Gas Chemical Co., Ltd. "AI polymer", polyimide: Mitsui Chemicals, Inc. "Aurum".

  Although the rigidity and wear resistance of the block can be improved by blending a fiber reinforcing material, the fiber reinforcing material used in the present invention is a short fiber made of carbon fiber, aramid fiber, glass fiber, polyester fiber, etc. Can be mentioned. Among these fibers, it is most preferable to use carbon fibers, and more preferable to use PAN-based carbon fibers from the viewpoints of increasing the rigidity of the block and improving the wear resistance.

  PAN-based carbon fiber is a fiber having a high elastic modulus and a high reinforcing effect in the first place. Among them, by using a fiber having a particularly high elastic modulus of 280 to 700 GPa, as a block of a high load transmission belt as in the present invention. It is possible to provide a material that can withstand sufficient use. If the elastic modulus is less than 280 GPa, the side pressure resistance of the block can be obtained to some extent, but the wear resistance is insufficient, and if it exceeds 700 GPa, even if the elastic modulus is high, the improvement of the side pressure resistance and wear resistance is not improved. Since it is not seen so much and becomes expensive, it is not preferable.

  The length of the fiber reinforcing material is usually about 0.1 to 10 mm. The blending amount of the fiber reinforcement is 10 to 60% by mass, and if it is less than 10% by mass, a sufficient reinforcing effect cannot be obtained, and if it exceeds 60% by mass, block injection molding becomes difficult, which is not preferable. .

  In addition to a thermoplastic resin and a fiber reinforcing material, a friction reducing material may be blended. As the friction reducing material, calcium carbonate, calcium phosphate, ultrahigh molecular weight polyethylene, fluororesin, potassium titanate, graphite, aluminum borate, Alumina, iron powder, zinc oxide, molybdenum disulfide, mica, talc (hydrous magnesium silicate), pyrophyllite (waxite clay) and the like can be mentioned.

  A material used as the elastomer 4 of the center belts 3a and 3b is a single material such as chloroprene rubber, natural rubber, nitrile rubber, styrene-butadiene rubber, hydrogenated nitrile rubber or rubber or polyurethane rubber obtained by appropriately blending these. 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. Moreover, the core wire 5 can also use the woven fabric, knitted fabric, metal thin plate, etc. which consist of said fiber other than what embedded the rope in spiral shape.

  Next, the Tg used in the high load transmission belt of the present invention is the same as that of the block containing a thermoplastic resin having a Tg of 100 ° C. or higher or a heat deformation temperature of 120 ° C. or higher at a load of 1.82 MPa in accordance with JIS K7191 The amount of wear of the resin was compared using a test piece made of a resin molded product and a test piece made of a resin molded product having a composition deviating from the present invention.

(Example 1)
The resin molded product of Example 1 used a polyamideimide (PAI) resin containing 30% by mass of carbon fiber as a fiber reinforcement.

  Using this resin molding, the amount of wear was measured by a thrust wear test. The measurement conditions were a load of 1.5 MPa and a sliding speed of 0.5 m / s. The amount of wear was measured as the amount of decrease in the thickness of the molded resin before and after the thrust friction wear test. The results are shown in Table 1.

(Example 2)
The resin molded product of Example 2 used a polyimide (PI) resin containing 30% by mass of carbon fiber as a fiber reinforcing material.

  The amount of wear was measured using this resin molding. The measurement conditions were a load of 1.5 MPa and a sliding speed of 0.5 m / S. The amount of wear was measured as the amount of decrease in the thickness of the molded resin before and after the thrust friction wear test. The results are shown in Table 1.

(Example 3)
The resin molded product of Example 3 used a polyetherimide (PEI) resin containing 30% by mass of carbon fiber as a fiber reinforcing material.

  The amount of wear was measured using this resin molding. The measurement conditions were a load of 1.5 MPa and a sliding speed of 0.5 m / S. The amount of wear was measured as the amount of decrease in the thickness of the molded resin before and after the thrust friction wear test. The results are shown in Table 1.

(Example 3)
In the resin molded product of Example 3, a polyether ether ketone (PEEK) resin containing 30% by mass of carbon fiber was used as a fiber reinforcing material.

  The amount of wear was measured using this resin molding. The measurement conditions were a load of 1.5 MPa and a sliding speed of 0.5 m / S. The amount of wear was measured as the amount of decrease in the thickness of the molded resin before and after the thrust friction wear test. The results are shown in Table 1.

(Comparative Example 1)
The resin molded product of Comparative Example 1 used polyamide (PA) 46 resin containing 30% by mass of carbon fiber as a fiber reinforcing material.

  Using this resin molding, the amount of wear was measured by a thrust wear test. The measurement conditions were a load of 1.5 MPa and a sliding speed of 0.5 m / s. The amount of wear was measured as the amount of decrease in the thickness of the molded resin before and after the thrust friction wear test. The results are shown in Table 1.

  As can be seen from the results in Table 1, it can be seen that the amount of wear is kept low in a resin molding material having a Tg of 100 ° C. or higher or a heat deformation temperature of 120 ° C. or higher at a load of 1.82 MPa in accordance with JIS K7191.

  Next, a resin composition in which a fiber reinforcing material and an abrasion reducing material are blended with a polymer alloy composed of two types of thermoplastic resins, and a resin in which a fiber reinforcing material and an abrasion reducing material are similarly blended into one type of thermoplastic resin. A test piece was prepared using the composition, the amount of wear of the resin was compared, and the impact resistance and moldability were also evaluated.

(Example 5)
As the resin molded product of Example 5, a PAI / PPS polymer alloy containing 30% by mass of carbon fibers was used as a fiber reinforcing material.

(Example 6)
As the resin molded product of Example 6, a PPS resin containing 30% by mass of carbon fibers was used as a fiber reinforcing material.

(Example 7)
As the resin molded product of Example 7, PAI resin containing 30% by mass of carbon fibers was used as a fiber reinforcing material.

  The abrasion amount was measured by the thrust abrasion test using the resin molded bodies of Examples 10 to 14 described above. The measurement conditions were a load of 1.5 MPa and a sliding speed of 0.5 m / s. The amount of wear was measured as the amount of decrease in the thickness of the molded resin before and after the thrust friction wear test. Furthermore, impact resistance and moldability were also evaluated and divided into three stages: ○: good, Δ: slightly inferior, ×: inferior. The results are shown in Table 2.

  As can be seen from the results in Table 2, in Example 5 using the polymer alloy, the impact resistance and the moldability were maintained well, the wear amount was small, and the wear resistance was excellent. On the other hand, in Examples 6 and 7, the wear amount is not so large and it can be used sufficiently, but in Example 6, the impact resistance is slightly inferior. Is a little inferior. Therefore, the effect of using the PAI / PPS polymer alloy was confirmed.

  Belts that can prevent cracks by suppressing multiple directions of bending of blocks attached to the belt, such as cars, motorcycles, continuously variable transmissions for agricultural machinery, etc., belts that change the effective diameter of pulleys and transmit large torque Can be applied as

It is a perspective schematic diagram showing an example of the high load transmission belt concerning the present invention. It is a side view of the high load power transmission belt concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High load 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 19 Convex part 20 Groove part 21 Groove part

Claims (10)

  In a high-load transmission belt comprising a center belt in which a core body is embedded in an elastomer and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, the block includes at least a fiber reinforcing material in a thermoplastic resin. A high load characterized by comprising a blended resin composition, wherein the thermoplastic resin is blended in a proportion of 40 to 90% by mass and the fiber reinforcing material is blended in a proportion of 10 to 60% by mass with respect to the total amount of the resin composition. Transmission belt.   The high load transmission belt according to claim 1, wherein the thermoplastic resin has a glass transition temperature (Tg) of 100 ° C or higher, or a heat deformation temperature at a load of 1.82 MPa in accordance with JIS K7191 is 120 ° C or higher.   The high load transmission belt according to claim 2, wherein a polymer alloy comprising at least two kinds of resins is used as the thermoplastic resin.   4. The high load transmission belt according to claim 3, wherein a polymer alloy comprising two kinds of polyamide imide and polyphenylene sulfide is used.   The high load transmission belt according to claim 1, wherein the fiber reinforcing material is carbon fiber.   In the high load transmission belt block used for the high load transmission belt composed of a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the center belt, the block is composed of a resin composition in which at least a fiber reinforcing material is blended with a thermoplastic resin, A block for a high load transmission belt, comprising a resin composition in which a thermoplastic resin is blended in an amount of 40 to 90% by mass and a fiber reinforcement is blended in an amount of 10 to 60% by mass with respect to the total amount of the resin composition.   The high load transmission belt block according to claim 4, wherein the glass transition temperature (Tg) of the thermoplastic resin is 100 ° C. or higher, or the thermal deformation temperature at a load of 1.82 MPa in accordance with JIS K7191 is 120 ° C. or higher.   The high load transmission belt block according to claim 7, wherein a polymer alloy comprising at least two kinds of resins is used as the thermoplastic resin.   9. The block for a high load transmission belt according to claim 8, wherein a polymer alloy comprising two kinds of polyamide imide and polyphenylene sulfide is used.   The high load transmission belt block according to claim 6, wherein the fiber reinforcing material is carbon fiber.

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