WO2017110790A1 - Courroie de transmission à frottement et son procédé de fabrication - Google Patents

Courroie de transmission à frottement et son procédé de fabrication Download PDF

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Publication number
WO2017110790A1
WO2017110790A1 PCT/JP2016/087905 JP2016087905W WO2017110790A1 WO 2017110790 A1 WO2017110790 A1 WO 2017110790A1 JP 2016087905 W JP2016087905 W JP 2016087905W WO 2017110790 A1 WO2017110790 A1 WO 2017110790A1
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WO
WIPO (PCT)
Prior art keywords
lubricant
belt
friction transmission
rubber
rubber layer
Prior art date
Application number
PCT/JP2016/087905
Other languages
English (en)
Japanese (ja)
Inventor
三浦　義弘
高場　晋
久登 石黒
Original Assignee
三ツ星ベルト株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2016240728A external-priority patent/JP6435311B2/ja
Application filed by 三ツ星ベルト株式会社 filed Critical 三ツ星ベルト株式会社
Priority to EP16878679.6A priority Critical patent/EP3396202B1/fr
Priority to CN201680075221.2A priority patent/CN108431450B/zh
Publication of WO2017110790A1 publication Critical patent/WO2017110790A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • B29D29/10—Driving belts having wedge-shaped cross-section
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/16—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/02—Natural products
    • C10M159/06—Waxes, e.g. ozocerite, ceresine, petrolatum, slack-wax
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
    • F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed

Definitions

  • the present invention relates to a friction transmission belt such as a V-belt or a V-ribbed belt in which a friction transmission surface is inclined in a V shape, and a method for manufacturing the same. It relates to a manufacturing method.
  • friction transmission belts such as V-belts, V-ribbed belts, and flat belts are known as transmission belts for transmitting power.
  • a V-belt or V-ribbed belt having a friction transmission surface (V-shaped side surface) formed at a V angle is wound around a driving pulley and a driven pulley with tension applied between the V-shaped side surface and the V groove of the pulley. Rotates between two shafts in contact. In the process, power is transmitted using energy associated with friction generated by thrust between the V-shaped side surface and the pulley V groove.
  • These friction transmission belts have a core body (core wire) embedded in the rubber body (between the compressed rubber layer and the stretched rubber layer) along the longitudinal direction of the belt, and this core body (core wire) is driven. It plays the role of transmitting the power from the pulley to the driven pulley.
  • an adhesive rubber layer is usually provided.
  • the V-belt is covered with a low-edge (raw-edge) type (low-edge V-belt) rubber layer with an exposed friction transmission surface (V-shaped side surface) and a cover cloth on the friction transmission surface (V-shaped side surface).
  • Wrapped types are used depending on the application depending on the surface properties of the friction transmission surface (friction coefficient between the rubber layer and the cover cloth).
  • the low edge type belt has a low edge cog V that has improved flexibility by providing cogs only on the lower surface (inner peripheral surface) of the belt or on both the lower surface (inner peripheral surface) and the upper surface (outer peripheral surface) of the belt. There is a belt.
  • the low edge V belt and the low edge cogged V belt are mainly used for driving general industrial machinery, agricultural machinery, and driving auxiliary machinery in automobile engines.
  • a low edge cogged V belt called a transmission belt used in a belt type continuously variable transmission such as a motorcycle.
  • the belt-type continuously variable transmission 30 is a device that wraps the friction transmission belt 1 around a drive pulley 31 and a driven pulley 32 to change the gear ratio steplessly.
  • Each pulley 31 and 32 is composed of fixed pulley pieces 31a and 32a fixed in the axial direction and movable pulley pieces 31b and 32b movable in the axial direction. These fixed pulley pieces 31a and 32a and the movable pulley
  • the pulleys 31 and 32 formed by the pieces 31b and 32b have a structure capable of continuously changing the width of the V groove.
  • the transmission belt 1 has both end faces in the width direction formed of tapered surfaces whose inclinations coincide with the opposing faces of the V grooves of the pulleys 31 and 32, and the opposing faces of the V grooves according to the changed width of the V grooves. It fits in any vertical position. For example, when the width of the V groove of the driving pulley 31 is narrowed and the width of the V groove of the driven pulley 32 is widened to change the state shown in FIG. 1A to the state shown in FIG.
  • the speed change belt used in such applications is used in a severe layout under a high load while the belt is largely bent. In other words, not only the rotational rotation of the drive pulley and the driven pulley between the two axes, but also the movement in the pulley radial direction and the severe movement in high load environment such as the repeated bending motion due to the continuous change of the winding radius Specific design is made to withstand.
  • a friction transmission belt such as a transmission belt
  • the resistance to side pressure received from the pulley is the resistance to side pressure received from the pulley.
  • a rubber composition having a large mechanical property reinforced by blending short fibers or the like is used for the compression rubber layer and the stretch rubber layer.
  • the adhesive rubber is excessively enhanced in mechanical properties, the bending fatigue resistance is lowered. Therefore, a rubber composition having relatively small mechanical properties is used.
  • the rubber hardness of at least one of the stretched and compressed rubber layers is set to 90 to 96 °, and the rubber hardness of the adhesive rubber layer is set to 83 to 89 °.
  • a transmission V-belt in which short fibers are oriented in the belt width direction is disclosed.
  • cracks and separation (peeling) of each rubber layer and cord are prevented from occurring at an early stage, side pressure resistance is improved, and high load transmission capability is improved.
  • Shear stress is generated inside the belt as the belt moves and deforms (buckling) in the radial direction of the pulley, and in particular, the interface has a difference in mechanical properties (in this case, bonded to compressed rubber or stretched rubber) Interfacial delamination (cracking) occurs because shear stress tends to concentrate on the interface with the rubber.
  • the contact surface (transmission surface) with the pulley is worn by sliding with the pulley.
  • Patent Document 2 discloses a fatty acid amide.
  • a transmission belt provided with a compressed rubber layer containing a rubber and a short fiber is disclosed.
  • Patent Document 3 discloses a transmission V-belt in which short fibers are embedded in the compressed rubber layer and the stretched rubber layer so as to be oriented in the width direction, and the short fibers protrude at least on the side surfaces of the stretched rubber layer.
  • the lower cog forming part and the upper cog forming part contain 40 to 80 parts by weight of filler with respect to 100 parts by weight of rubber, and the filler contains 30% or more of silica,
  • a double cogged V-belt formed from a rubber composition having a specific dynamic viscoelasticity is disclosed.
  • these documents disclose various technologies that achieve both lateral pressure resistance and fuel efficiency.
  • the factors affecting the transmission efficiency are (1) bendability in the belt circumferential direction, (2) rigidity in the belt width direction (side pressure resistance), and (3) friction coefficient of the friction transmission surface, (1) Increase the flexibility in the belt circumferential direction (decrease the bending rigidity to make it easier to bend), (2) Increase the rigidity in the belt width direction (side pressure resistance), (3) Increase the friction coefficient of the friction transmission surface Transmission efficiency can be increased (transmission loss can be reduced) by means of reducing (reducing the frictional force of the friction transmission surface and smoothing the sliding with the pulley).
  • Patent Documents 2 to 4 a design concept that focuses on any of the factors (1) to (3) provides a means for improving the transmission efficiency and balancing the durability and the speed change characteristics (acceleration performance). Proposed.
  • Patent Document 5 discloses a rubber composition in which part of a friction transmission surface is blended with 10 to 25 parts by weight of an ether ester plasticizer and 60 to 110 parts by weight of an inorganic filler with respect to 100 parts by weight of an ethylene / ⁇ -olefin elastomer.
  • a belt transmission device composed of an article is disclosed.
  • This document discloses a compressed layer containing short fibers in which short fibers are oriented in the width direction.
  • Patent Document 6 discloses a transmission belt in which the friction coefficient in the belt movement method on the side surface of the belt is adjusted to a range of 0.3 to 0.8 by blending short fibers and a lubricant into the rubber as the compression rubber layer.
  • This document describes solid lubricants such as graphite, molybdenum disulfide, polytetrafluoroethylene, mica, talc, polyolefin resin powder, paraffin wax, and liquid lubricants such as silicone oil and paraffin oil as lubricants.
  • graphite, molybdenum disulfide, mica and talc are preferred.
  • 15 to 45 parts by mass of aramid short fibers are blended with 100 parts by mass of chloroprene rubber, and graphite and silicone oil are blended as lubricants.
  • An object of the present invention is to provide a friction transmission belt capable of improving the side pressure resistance while maintaining fuel efficiency and a method for manufacturing the same.
  • Another object of the present invention is to provide a friction transmission belt capable of improving transmission efficiency under high load conditions and / or high speed conditions even when applied to a transmission belt and suppressing cracks even when used for a long period of time. It is in providing the manufacturing method.
  • the present inventors have determined that at least a friction transmission surface of a friction transmission belt provided with a compression rubber layer formed of a vulcanized product of a rubber composition containing a rubber component and short fibers.
  • the inventors have found that the presence of a lubricant containing a wax in part can improve the side pressure resistance while maintaining fuel efficiency, and have completed the present invention.
  • the friction transmission belt of the present invention has a compression rubber layer formed of a rubber composition and a vulcanized rubber composition including a rubber component and short fibers, and at least a part of which has a friction transmission surface that can come into contact with the pulley.
  • a friction transmission belt including a lubricant containing wax in at least a part of the friction transmission surface.
  • the area ratio of the lubricant to the entire friction transmission surface may be 50% or more.
  • the melting point of the lubricant may be not more than the vulcanization temperature of the compressed rubber layer.
  • the lubricant may include a lubricant having a melting point within ⁇ 30 ° C. from the belt operating temperature.
  • the lubricant may further contain a fatty acid amide.
  • the rubber composition may contain a lubricant.
  • the ratio of the lubricant may be about 0.5 to 10 parts by mass with respect to 100 parts by mass of the rubber component.
  • the proportion of the short fibers may be 30 parts by mass or less with respect to 100 parts by mass of the rubber component.
  • the short fibers may protrude from the friction transmission surface.
  • the lubricant may form a lubricant layer on the friction transmission surface, and the short fibers may protrude from the surface of the lubricant layer.
  • the short fibers may be oriented in the belt width direction.
  • the rubber component may contain chloroprene rubber.
  • the friction transmission belt of the present invention may be a low edge cogged V belt.
  • the present invention also includes a method of manufacturing the friction transmission belt including a lubricant exposure step in which a lubricant containing wax is present on at least a part of the friction transmission surface.
  • the lubricant exposing step includes a vulcanizing step of vulcanizing a rubber composition containing a rubber component and short fibers to obtain a belt sleeve, and cutting the obtained belt sleeve in the belt longitudinal direction to form a compressed rubber layer.
  • a process may be included.
  • the lubricant exposing step may further include a polishing step of polishing the side surfaces of the compressed rubber layer obtained in the cutting step to project the short fibers.
  • the lubricant containing wax is present on at least a part of the friction transmission surface of the friction transmission belt provided with the compressed rubber layer formed of a vulcanized rubber composition containing a rubber component and short fibers.
  • Fuel economy (transmission efficiency) and lateral pressure resistance (durability) can be improved.
  • a compressed rubber layer is formed of a rubber composition containing wax
  • the friction coefficient of the surface is reduced, the slidability with the pulley is improved, and transmission loss can be reduced.
  • the friction coefficient of the friction transmission surface is reduced by the wax, the amount of short fibers is not excessively increased, and the generation of cracks starting from the short fibers can be suppressed. Furthermore, when the short fibers are projected from the friction transmission surface, the friction coefficient can be further reduced by the combined effect of the short fibers and the wax. Therefore, even when applied to a transmission belt, the transmission efficiency can be improved under high load conditions and / or high speed conditions, and the occurrence of cracks can be suppressed even when used for a long period of time.
  • FIG. 1 is a schematic diagram for explaining a speed change mechanism of a belt type continuously variable transmission.
  • FIG. 2 is a schematic perspective view showing an example of the friction transmission belt of the present invention.
  • FIG. 3 is a schematic sectional view of the friction transmission belt of FIG. 2 cut in the belt longitudinal direction.
  • FIG. 4 is a schematic sectional view showing an example of a compressed rubber layer of the friction transmission belt of the present invention.
  • FIG. 5 is a schematic sectional view showing another example of the compression rubber layer of the friction transmission belt of the present invention.
  • FIG. 6 is a schematic sectional view showing still another example of the compression rubber layer of the friction transmission belt of the present invention.
  • FIG. 7 is a schematic diagram for explaining a method for measuring transmission efficiency.
  • FIG. 1 is a schematic diagram for explaining a speed change mechanism of a belt type continuously variable transmission.
  • FIG. 2 is a schematic perspective view showing an example of the friction transmission belt of the present invention.
  • FIG. 3 is a schematic sectional view of the friction transmission
  • FIG. 8 is a schematic diagram for explaining a method of measuring a friction coefficient in the embodiment.
  • FIG. 9 is a schematic diagram for explaining a high-load running test in the example.
  • FIG. 10 is a schematic diagram for explaining a high-speed running test in the example.
  • FIG. 11 is a schematic diagram for explaining a durability running test in the example.
  • FIG. 12 is an electron micrograph of the surface of the compressed rubber layer in the belt obtained in Example 4.
  • a lubricant containing wax is present on at least a part of the friction transmission surface of the compressed rubber layer formed of a vulcanized rubber composition containing a rubber component and short fibers.
  • a core extending in the longitudinal direction of the belt, an adhesive rubber layer in which the core is embedded, a compressed rubber layer formed on one surface of the adhesive rubber layer, and on the other surface of the adhesive rubber layer And a formed elastic rubber layer.
  • Examples of the friction transmission belt of the present invention include a V belt [a wrapped V belt, a low edge V belt, a low edge cogged V belt (a low edge cogged V belt having a cog formed on the inner peripheral side of the low edge belt, Low edge double cogged V belt in which cogs are formed on both the circumferential side and the outer circumferential side)], V-ribbed belt, flat belt, and the like.
  • a V belt or a V-ribbed belt in which the friction transmission surface is inclined in a V shape (at a V angle) is preferable because it receives a large lateral pressure from the pulley.
  • the low edge cogged V-belt is particularly preferable because it is used in a belt-type continuously variable transmission that requires a high degree of fuel economy.
  • FIG. 2 is a schematic perspective view showing an example of the friction transmission belt (low edge cogged V belt) of the present invention
  • FIG. 3 is a schematic cross-sectional view of the friction transmission belt of FIG. 2 cut in the belt longitudinal direction.
  • the friction transmission belt 1 has a plurality of cogs 1a formed at predetermined intervals along the longitudinal direction of the belt (A direction in the drawing) on the inner peripheral surface of the belt main body.
  • the cross-sectional shape of the cog portion 1a in the longitudinal direction is substantially semicircular (curved or corrugated), and the cross-sectional shape in the direction orthogonal to the longitudinal direction (width direction or B direction in the figure) is a table. Shape. That is, each cog 1a protrudes from the cog bottom 1b in a cross section in the A direction in a substantially semicircular shape in the belt thickness direction.
  • the friction transmission belt 1 has a laminated structure, and the reinforcing cloth 2, the stretch rubber layer 3, the adhesive rubber layer 4, and the compression from the belt outer peripheral side toward the inner peripheral side (side where the cog portion 1 a is formed).
  • a rubber layer 5 and a reinforcing cloth 6 are sequentially laminated.
  • the cross-sectional shape in the belt width direction is a trapezoidal shape in which the belt width decreases from the belt outer peripheral side toward the inner peripheral side.
  • a core body 4a is embedded in the adhesive rubber layer 4, and the cog 1a is formed on the compressed rubber layer 5 by a cog-molding mold.
  • the compressed rubber layer is formed of a vulcanized product of a rubber composition containing a rubber component and short fibers, and a lubricant containing wax is present on at least a part of the friction transmission surface.
  • short fibers are blended in a rubber composition that forms a compressed rubber layer that receives a large side pressure and frictional force from the pulley, and the short fibers are preferably oriented in the belt width direction to ensure lateral pressure resistance. It is preferable that the blend amount of the short fiber is set to a minimum necessary for ensuring the lateral pressure resistance.
  • FIG. 4 is a schematic sectional view showing an example of a compressed rubber layer of the friction transmission belt of the present invention. As shown in FIG. 4, in this friction transmission belt, short fibers 7 are oriented along the belt width direction inside the compression rubber layer 5 and the stretch rubber layer 3, and the friction transmission surface of the compression rubber layer 5. A lubricant 8 is fixed to the surface. The lubricant may be present on the friction transmission surface.
  • the belt sleeve is cut in the longitudinal direction of the belt, thereby converting the lubricant into the compression rubber. You may make it bloom from the inside of a layer, and make it adhere to the surface (friction transmission surface).
  • the blending amount of the short fibers can be adjusted to the minimum necessary due to the presence of the lubricant, the bending rigidity of the belt can be kept small while maintaining the side pressure resistance. Therefore, both the coefficient of friction (improvement of slidability) and bending rigidity (improvement of flexibility) can be reduced, and the transmission loss is small and fuel saving can be ensured. That is, the combined use of the short fibers and the lubricant (wax) can improve the side pressure resistance and the fuel economy (both flexibility and slidability).
  • FIG. 5 is a schematic sectional view showing another example of the compressed rubber layer of the friction transmission belt of the present invention.
  • the lubricant 8 exists on the friction transmission surface, and the short fibers 7 protrude (or are exposed) on the friction transmission surface.
  • the lubricant 8 is fixed around the protruding short fiber 7 to cover the friction transmitting surface at the friction transmission surface, and the tip of the protruding short fiber 7 is not covered and exposed.
  • the slidability of the friction transmission surface can be further improved by protruding the short fibers.
  • FIG. 6 is a schematic cross-sectional view showing another example of the compressed rubber layer of the friction transmission belt of the present invention.
  • the lubricant 8 is contained in the surface rubber layer 9 and blooms on the surface of the surface rubber layer 9.
  • the lubricant present on the surface of the friction transmission surface may be a lubricant that exudes the lubricant contained in the rubber composition forming the compressed rubber layer, and is a lubricant fixed to the friction transmission surface.
  • it may be a lubricant contained in a surface rubber layer containing a lubricant.
  • the lubricant exuded from the rubber composition forming the compressed rubber layer is preferable from the viewpoint that the effect of the lubricant can be maintained for a long time.
  • the lubricant If the lubricant is in a liquid state at the belt operating temperature, the lubricity is lowered. Therefore, it is necessary to select a lubricant having a melting point suitable for the belt operating temperature.
  • the compatibility with the rubber component that forms the compressed rubber layer is low, and the melting point and molecular weight are compared. It is preferable to use a low lubricant. This is because when the lubricant approaches the melting point, the molecules easily move and easily move to the surface of the compressed rubber layer.
  • the lubricant melts and moves to the surface side where a friction transmission surface is formed inside the rubber composition.
  • the lubricant is exposed to the friction transmission surface in the cutting process, and in the cutting process and the subsequent polishing process, it is melted by the frictional heat of the cutting and polishing and blooms from the inside of the compressed rubber layer to move to the friction transmission surface. To be promoted. Further, even during the running of the belt, the lubricant is pushed out from the inside of the compressed rubber layer due to the bending deformation of the belt and blooms on the friction transmission surface. At that time, if the melting point of the lubricant is too high above the belt operating temperature, it becomes difficult for the lubricant to bloom on the surface of the compressed rubber layer. If the melting point of the lubricant is too low than the belt operating temperature, the lubricant becomes liquid and lubricates.
  • a lubricant having a melting point suitable for the belt use temperature (melting point near the use temperature) is selected.
  • the lubricant melts and blooms on the friction transmission surface in the cutting process and the polishing process, but since the compressed rubber layer contains short fibers, the lubricant passes through the interface between the rubber component and the short fibers. Easy to bloom. Therefore, a compressed rubber layer in which short fibers protrude (or are exposed) on the friction transmission surface is preferable.
  • the melting point (or softening point) of the lubricant is preferably not higher than the vulcanization temperature of the compressed rubber layer, for example, (vulcanization temperature ⁇ 150) ° C. to (vulcanization temperature ⁇ 10) ° C., preferably (vulcanization temperature ⁇ 130) ° C. to (vulcanization temperature ⁇ 30) ° C., more preferably (vulcanization temperature ⁇ 120) ° C. to (vulcanization temperature ⁇ 50) ° C.
  • the lubricant preferably includes a lubricant having a melting point near the belt use temperature (surface temperature).
  • the difference from the belt use temperature is within ⁇ 30 ° C., preferably within ⁇ 20 ° C., more preferably It is preferable to include a lubricant having a melting point within ⁇ 10 ° C. (particularly within ⁇ 5 ° C.).
  • the maximum temperature is defined as the operating temperature of the belt. In such a case, it is preferable to combine a plurality of lubricants having different melting points.
  • the melting point (or softening point) of the lubricant may be specifically 150 ° C. or lower, for example, 35 to 140 ° C., preferably 45 to 130 ° C., more preferably about 50 to 120 ° C.
  • the melting point of the lubricant can be measured using a differential scanning calorimeter (DSC), and in the case of a mixture, it means the average value of the melting points.
  • DSC differential scanning calorimeter
  • the area ratio of the lubricant to the entire friction transmission surface is preferably 50% or more, for example, 50 to 100%, preferably about 80 to 100%. If the area occupied by the lubricant is too small, the lubricity may decrease.
  • the occupation area of the lubricant is measured by using a scanning electron microscope (manufactured by JEOL Ltd., model number: JSM5900LV) to photograph the friction transmission surface and measuring software (Olympus Co., Ltd., “Stream”).
  • the lubricant and the other (fiber and rubber) can be measured by a method of recognizing the difference in light and shade.
  • the short fibers do not protrude from the friction transmission surface, it is preferable to form a lubricant layer in which the entire friction transmission surface is coated with the lubricant, and when the short fibers protrude from the friction transmission surface, It is preferable to form a lubricant layer in which the entire region of the transmission surface excluding the short fiber protrusion (or the vicinity of the tip of the protrusion) is coated with the lubricant.
  • the ratio of the lubricant can be selected from the range of about 0.1 to 30 parts by mass with respect to 100 parts by mass of the rubber component, for example, 0.3 to 20 parts by mass, preferably 0.5.
  • the amount is about 10 to 10 parts by mass (eg 2 to 6 parts by mass), more preferably about 3 to 8 parts by mass (particularly 4 to 7 parts by mass). If the ratio of the lubricant is too small, the lubricity may be lowered, and if it is too much, the mechanical characteristics of the compressed rubber layer may be lowered.
  • the lubricant contains a wax because it has a high effect of improving the slidability of the friction transmission surface and is likely to bloom on the friction transmission surface even if included in the compressed rubber layer.
  • wax examples include aliphatic hydrocarbon waxes (eg, poly C 2-4 olefin waxes such as polyethylene wax, ethylene copolymer wax, polypropylene wax, paraffin waxes such as natural paraffin and synthetic paraffin, microcrystalline Wax, etc.), vegetable or animal waxes (for example, carnauba wax, beeswax, shellac wax, montan wax, etc.).
  • poly C 2-4 olefin waxes such as polyethylene wax, ethylene copolymer wax, polypropylene wax, paraffin waxes such as natural paraffin and synthetic paraffin, microcrystalline Wax, etc.
  • paraffin waxes such as natural paraffin and synthetic paraffin, microcrystalline Wax, etc.
  • vegetable or animal waxes for example, carnauba wax, beeswax, shellac wax, montan wax, etc.
  • waxes can be used alone or in combination of two or more.
  • paraffins such as normal paraffin (linear hydrocarbon), isoparaffin and cycloparaffin, and aliphatic hydrocarbon waxes such as microcrystalline wax (particularly paraffin and microcrystalline wax). In combination) is preferred.
  • the melting point (or softening point) of the wax may be 35 ° C. or higher, for example, 35 to 120 ° C., preferably 40 to 120 ° C. (especially 50 to 100 ° C.), more preferably 45 to 90 ° C. (particularly 50 to 80 ° C.). Degree). If the melting point is too low, the lubricity may be lowered. If it is too high, bloom may be suppressed when blended inside the compressed rubber layer.
  • the lubricant preferably contains a fatty acid amide in addition to the wax.
  • fatty acid amides include higher fatty acid monoamides such as behenic acid amide, arachidic acid amide, stearic acid amide, hydroxystearic acid amide, palmitic acid amide, myristic acid amide, lauric acid amide, erucic acid amide, oleic acid amide, and ricinoleic acid.
  • Saturated or unsaturated higher fatty acid amides or monoamides such as amides; saturated or unsaturated higher fatty acid bisamides such as alkylene bis saturated or unsaturated higher fatty acid amides (eg methylene bis stearic acid amide, methylene bis lauric acid amide, methylene bis hydroxy Stearic acid amide, methylene bisoleic acid amide, ethylene bisbehenic acid amide, ethylene bis stearic acid amide, ethylene biscaprylic acid amide, Tylene biscapric acid amide, ethylene bislauric acid amide, isostearic acid amide, ethylene biserucic acid amide, ethylene bisoleic acid amide, tetramethylene bisstearic acid amide, hexamethylene bisbehenic acid amide, hexamethylene bisstearic acid amide, C 1-10 alkylene bissaturated or unsaturated higher fatty acid amides such as oxamethylene bishydroxystearic
  • Fatty acid amides include aromatic bisamides (bisamides of aromatic diamines such as xylylene bisstearic acid amide and saturated or unsaturated higher fatty acids, aromatic dicarboxylic acids such as N, N′-distearyl phthalic acid amide, and the like.
  • substituted amides N-lauryl lauric acid amide, N-palmityl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearin
  • Higher fatty acid amides in which saturated or unsaturated higher fatty acid residues are amide-bonded to nitrogen atoms of amide groups such as acid amides, N-stearyl erucic acid amides, N-stearyl hydroxystearic acid amides, and ester amides (ethanolamine dibenate)
  • Etano Alkanolamine hydroxyl groups and higher fatty acids such as allamine amine stearate, ethanolamine dipalmitate, propanolamine distearate, and propanolamine dipalmitate are ester-bonded, and the alkanolamine amino group and higher fatty acid are amides.
  • Conjugated ester amide Conjugated ester amide
  • alkanol amide methylol stearic acid amide, methylol behenic acid amide, etc.
  • methylol amides such as methylol higher fatty acid monoamide, stearic acid monoethanol amide, erucic acid monoethanol amide, etc.
  • N-hydroxy C 2-4 Alkyl higher fatty acid monoamide substituted urea
  • substituted urea N-butyl-N′-stearyl urea, N-phenyl-N′-stearyl urea, N-stearyl-N′-stearyl urea, xyl
  • substituted ureas in which higher fatty acids are amide-bonded to nitrogen atoms of urea such as rylene bisstearyl urea, toluylene bisstearyl urea, hexamethylene bisstearyl urea, and diphenylmethane bisstearyl urea.
  • the higher fatty acid and higher amine may have about 10 to 34 carbon atoms (eg, 10 to 30, preferably 10 to 28, more preferably 12 to 24).
  • fatty acid amides can be used alone or in combination of two or more.
  • saturated or unsaturated higher fatty acid monoamides such as stearic acid amide and oleic acid amide (especially saturated or unsaturated higher fatty acid monoamides having 16 to 20 carbon atoms of higher fatty acids) are preferred.
  • the melting point of the fatty acid amide can be selected from the range of about 50 to 200 ° C., and is usually 65 to 150 ° C., preferably 80 to 140 ° C., more preferably 90 to 130 ° C. (especially 100 to 120 ° C.). Good.
  • the proportion of fatty acid amide is, for example, about 25 to 100 parts by mass, preferably about 30 to 80 parts by mass, and more preferably about 40 to 50 parts by mass with respect to 100 parts by mass of the wax. If the ratio of the fatty acid amide is too small, the lubricity in use at high temperatures may be reduced. Conversely, if it is too large, bloom may be suppressed when blended inside the compressed rubber layer.
  • the lubricant may contain other lubricants in addition to the wax (and fatty acid amide).
  • examples of other lubricants include silicone compounds (eg, silicone oil, silicone wax, silicone resin, polyorganosiloxane having a polyoxyalkylene unit), fluorine-containing compounds (eg, fluorine oil, polytetrafluoroethylene, etc.) Etc. These other lubricants can be used alone or in combination of two or more.
  • the ratio of the other lubricant is 50% by mass or less, for example, 0.01 to 30% by mass, preferably 0.05 to 20% by mass, and more preferably about 0.1 to 10% by mass with respect to the entire lubricant.
  • the ratio of the wax to the entire lubricant is, for example, 30% by mass or more, preferably 30 to 100% by mass, and more preferably about 50 to 100% by mass.
  • the total proportion of wax and fatty acid amide is, for example, 50% by mass or more, preferably 80% by mass or more, and more preferably 90% by mass or more with respect to the entire lubricant.
  • Short fiber examples include polyolefin fibers (polyethylene fibers, polypropylene fibers, etc.), polyamide fibers (polyamide 6 fibers, polyamide 66 fibers, polyamide 46 fibers, aramid fibers, etc.), polyalkylene arylate fibers (polyethylene terephthalate (PET)). Fibers, poly C 2-4 alkylene C 6-14 arylate fibers such as polyethylene naphthalate (PEN) fibers, etc.], vinylon fibers, polyvinyl alcohol fibers, synthetic fibers such as polyparaphenylene benzobisoxazole (PBO) fibers; Natural fibers such as cotton, hemp and wool; inorganic fibers such as carbon fibers are widely used.
  • polyolefin fibers polyethylene fibers, polypropylene fibers, etc.
  • polyamide fibers polyamide 6 fibers, polyamide 66 fibers, polyamide 46 fibers, aramid fibers, etc.
  • polyalkylene arylate fibers polyethylene
  • short fibers can be used alone or in combination of two or more.
  • synthetic fibers and natural fibers especially synthetic fibers (polyamide fibers, polyalkylene arylate fibers, etc.), among others, are rigid and have high strength and modulus, and are at least easy to protrude from the surface of the compressed rubber layer.
  • Short fibers including aramid fibers are preferred.
  • Aramid short fibers also have high wear resistance. Aramid fibers are commercially available, for example, under the trade names “Conex”, “Nomex”, “Kevlar”, “Technola”, “Twaron”, and the like.
  • the short fibers are preferably oriented in the belt width direction and embedded in the compressed rubber layer. Further, it is preferable that the short fibers protrude from the surface of the compressed rubber layer, thereby reducing the friction coefficient of the surface to suppress noise (sound generation) and reducing wear due to friction with the pulley.
  • the average length of the short fibers may be, for example, about 1 to 20 mm, preferably about 1.2 to 15 mm (for example, 1.5 to 10 mm), more preferably about 2 to 5 mm (especially 2.5 to 4 mm). If the average length of the short fibers is too short, the mechanical properties (for example, the modulus) in the direction of preparation may not be sufficiently improved. Conversely, if the length is too long, the short fibers in the rubber composition may be poorly dispersed. As a result, the rubber may crack and the belt may be damaged early.
  • the average protruding height of the short fibers in the entire friction transmission surface is preferably 50 ⁇ m or more, for example, 50 to 200 ⁇ m, preferably 60 to 180 ⁇ m, more preferably 70 to 160 ⁇ m (particularly 80 to 150 ⁇ m). If the average protrusion height is too small, the friction coefficient of the surface may not be sufficiently reduced. Conversely, if the average protrusion height is too large, breakage or dropout is likely to occur.
  • the average protruding height is, for example, an enlarged observation of a cross section cut in the belt width direction with an electron microscope or the like, and a plurality of short fibers protruding from the belt side surface (projecting height) (for example, 10 to 1000, preferably 30 to 500, more preferably 50 to 200, particularly about 100), and these can be calculated by averaging.
  • the average fiber diameter of the short fibers is, for example, about 1 to 100 ⁇ m, preferably 3 to 50 ⁇ m, more preferably about 5 to 30 ⁇ m (particularly 10 to 20 ⁇ m). If the average fiber diameter is too large, the mechanical properties of the compressed rubber layer may be reduced, and if it is too small, the surface friction coefficient may not be sufficiently reduced.
  • the shape of the short fiber in the protruding portion is not particularly limited, the shape protruding substantially perpendicularly from the side surface, the shape curled in one direction (for example, the polishing direction), the shape fibrillated at the tip, and melted by the heat during polishing It may be a shape such as a flowering shape. Furthermore, the shape described in Japanese Patent Application Laid-Open No. 7-98044 and Japanese Patent Application Laid-Open No. 7-151191 may be used.
  • the combination with a lubricant present on the friction transmission surface can suppress the ratio of short fibers to a small amount, so that the bending rigidity of the belt can be reduced and the transmission efficiency of the belt can be improved.
  • the proportion of the short fibers may be 30 parts by mass or less with respect to 100 parts by mass of the rubber component, for example, 10 to 25 parts by mass, preferably 12 to 23 parts by mass, and more preferably about 15 to 20 parts by mass. For example, it may be about 10 to 20 parts by mass (particularly 12 to 18 parts by mass). If the proportion of short fibers is too small, the mechanical properties of the compressed rubber layer may be reduced.
  • At least the short fibers are preferably subjected to adhesion treatment (or surface treatment).
  • adhesion treatment or surface treatment
  • various adhesion treatments for example, treatment solutions containing an initial condensate of phenols and formalin (such as a prepolymer of a novolak or resol type phenol resin), treatment solutions containing a rubber component (or latex).
  • treatment solutions containing an initial condensate of phenols and formalin such as a prepolymer of a novolak or resol type phenol resin
  • treatment solutions containing a rubber component or latex
  • Treatment with a treatment liquid containing the initial condensate and a rubber component (latex), a silane coupling agent, an epoxy compound (epoxy resin, etc.), a treatment liquid containing a reactive compound (adhesive compound) such as an isocyanate compound, etc. be able to.
  • the short fibers are treated with a treatment solution containing the precondensate and a rubber component (latex), particularly at least a resorcin-formalin-latex (RFL) solution.
  • a treatment solution containing the precondensate and a rubber component (latex), particularly at least a resorcin-formalin-latex (RFL) solution may be used in combination.
  • short fibers may be pre-treated with a conventional adhesive component such as an epoxy compound (epoxy resin or the like) or a reactive compound (adhesive compound) such as an isocyanate compound. After processing, you may process with RFL liquid.
  • the RFL liquid is a mixture of an initial condensate of resorcin and formaldehyde and a rubber latex.
  • the type of latex is not particularly limited, and can be appropriately selected from rubber components described later according to the type of rubber component to be bonded.
  • the rubber component to be bonded is mainly composed of chloroprene rubber
  • the latex is diene rubber (natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber (SBR), styrene-butadiene-vinyl pyridine).
  • Terpolymer acrylonitrile butadiene rubber (nitrile rubber), hydrogenated acrylonitrile butadiene rubber (hydrogenated nitrile rubber), ethylene- ⁇ -olefin elastomer, chlorosulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, etc. There may be. These latexes may be used alone or in combination of two or more.
  • Preferred latexes are diene rubbers (styrene-butadiene-vinylpyridine terpolymers, chloroprene rubber, butadiene rubber, etc.), chlorosulfonated polyethylene rubber, and styrene-butadiene-vinylpyridine for further improving the adhesion.
  • Diene rubbers styrene-butadiene-vinylpyridine terpolymers, chloroprene rubber, butadiene rubber, etc.
  • chlorosulfonated polyethylene rubber styrene-butadiene-vinylpyridine for further improving the adhesion.
  • Ternary copolymers are preferred.
  • Adhesion treatment of the short fiber with a treatment liquid (RFL liquid or the like) containing at least a styrene-butadiene-vinylpyridine terpolymer can improve the adhesion between the rubber composition (chloroprene rubber composition or the
  • the ratio of the initial condensate of resorcin and formalin may be about 10 to 100 parts by mass (for example, 12 to 50 parts by mass, preferably 15 to 30 parts by mass) with respect to 100 parts by mass of the rubber content of the latex.
  • the total solid content concentration of the RFL liquid can be adjusted in the range of 5 to 40% by mass.
  • the adhesion rate of the adhesive component (solid content) to the short fiber [(mass after adhesion treatment ⁇ mass before adhesion treatment) / (mass after adhesion treatment) ⁇ 100] is, for example, 1 to 25 mass%, preferably 3 to It is 20% by mass, more preferably 5 to 15% by mass, and may be about 3 to 10% by mass (particularly 4 to 8% by mass). If the adhesion rate of the adhesive component is too small, the dispersibility of the short fiber in the rubber composition and the adhesive property between the short fiber and the rubber composition are insufficient. May be firmly fixed, and on the contrary, dispersibility may be reduced.
  • the method for preparing the bonded short fibers is not particularly limited.
  • a method in which multifilament long fibers are impregnated in a bonding treatment liquid and dried to be cut to a predetermined length, or an untreated short fiber is bonded to a bonding processing solution For example, a method of immersing the substrate in a predetermined time, and then removing the excess bonding treatment liquid by a method such as centrifugation, followed by drying can be used.
  • Rubber component examples include known rubber components and / or elastomers such as diene rubber [natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (nitrile rubber), hydrogenated nitrile. Rubber (including mixed polymers of hydrogenated nitrile rubber and unsaturated carboxylic acid metal salt), etc.], ethylene- ⁇ -olefin elastomer, chlorosulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, epichlorohydrin rubber, acrylic rubber Examples thereof include silicone rubber, urethane rubber, and fluorine rubber. These rubber components can be used alone or in combination of two or more.
  • an ethylene- ⁇ -olefin elastomer ethylene-propylene copolymer (EPM), ethylene-propylene-diene terpolymer ( Ethylene- ⁇ -olefin rubbers such as EPDM) and chloroprene rubber are preferable, and chloroprene rubber is particularly preferable.
  • the chloroprene rubber may be a sulfur-modified type or a non-sulfur-modified type.
  • the proportion of the chloroprene rubber in the rubber component may be about 50% by mass (especially 80 to 100% by mass), and 100% by mass (chloroprene rubber only) is particularly preferable.
  • the rubber composition may include a vulcanizing agent or a crosslinking agent (or a crosslinking agent system), a co-crosslinking agent, a vulcanization aid, a vulcanization accelerator, a vulcanization retarder, a metal oxide (for example, zinc oxide, Magnesium oxide, calcium oxide, barium oxide, iron oxide, copper oxide, titanium oxide, aluminum oxide, etc.), reinforcing agents (silicon oxide such as carbon black and hydrous silica), fillers (clay, calcium carbonate, talc, mica, etc.) ), Softeners (oils such as naphthenic oils), processing agents or processing aids (stearic acid, stearic acid metal salts, etc.), anti-aging agents (antioxidants, thermal anti-aging agents, anti-bending agents) , Ozone degradation inhibitors, etc.), colorants, tackifiers, plasticizers, coupling agents (silane coupling agents, etc.), stabilizers (UV absorbers,
  • a metal oxide for
  • the vulcanizing agent or the crosslinking agent conventional components can be used depending on the type of rubber component.
  • the metal oxide magnesium oxide, zinc oxide, etc.
  • organic peroxide diacyl peroxide, peroxyester
  • dialkyl peroxide sulfur vulcanizing agents
  • sulfur-based vulcanizing agent examples include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, sulfur chloride (sulfur monochloride, sulfur dichloride, etc.), and the like.
  • These crosslinking agents or vulcanizing agents may be used alone or in combination of two or more.
  • a metal oxide magnesium oxide, zinc oxide, etc.
  • the metal oxide may be used in combination with other vulcanizing agents (such as sulfur vulcanizing agents), and the metal oxide and / or sulfur vulcanizing agent may be used alone or in combination with a vulcanization accelerator. May be used.
  • the proportion of the vulcanizing agent can be selected from a range of about 1 to 20 parts by mass with respect to 100 parts by mass of the rubber component depending on the types of the vulcanizing agent and the rubber component.
  • the ratio of the organic peroxide as the vulcanizing agent is 1 to 8 parts by weight, preferably 1.5 to 5 parts by weight, and more preferably about 2 to 4.5 parts by weight with respect to 100 parts by weight of the rubber component.
  • the ratio of the metal oxide is 1 to 20 parts by weight, preferably 3 to 17 parts by weight, more preferably 5 to 15 parts by weight (particularly 7 to 13 parts by weight) with respect to 100 parts by weight of the rubber component. ) Select from a range of degrees.
  • co-crosslinking agent crosslinking aid or co-vulcanizing agent co-agent
  • crosslinking aids such as polyfunctional (iso) cyanurates [for example, triallyl isocyanurate (TAIC), triallyl cyanurate ( TAC), etc.], polydienes (eg, 1,2-polybutadiene, etc.), metal salts of unsaturated carboxylic acids [eg, zinc (meth) acrylate, magnesium (meth) acrylate, etc.], oximes (eg, quinonedi) Oximes, etc.), guanidines (eg, diphenylguanidine, etc.), polyfunctional (meth) acrylates (eg, ethylene glycol di (meth) acrylate, butanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, etc.), Bismaleimides (aliphatic bismaleimides such as N, N′-1,2 Ethylmaleimides
  • crosslinking aids can be used alone or in combination of two or more.
  • bismaleimides arene bismaleimides such as N, N'-m-phenylene dimaleimide or aromatic bismaleimides
  • the addition of bismaleimides can increase the degree of crosslinking and prevent adhesive wear and the like.
  • the ratio of the co-crosslinking agent (crosslinking aid) can be selected from the range of about 0.01 to 10 parts by mass, for example, 0.1 to 5 parts by mass (for example 0 .3-4 parts by mass), preferably about 0.5-3 parts by mass (for example, 0.5-2 parts by mass).
  • vulcanization accelerator examples include thiuram accelerators [for example, tetramethylthiuram monosulfide (TMTM), tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), tetrabutylthiuram disulfide (TBTD).
  • TMTM tetramethylthiuram monosulfide
  • TMTD tetramethylthiuram disulfide
  • TETD tetraethylthiuram disulfide
  • TBTD tetrabutylthiuram disulfide
  • thiazole accelerators eg, 2-mercaptobenzothiazol, 2 -Zinc salts of mercaptobenzothiazol, 2-mercaptothiazoline, dibenzothiazyl disulfide, 2- (4'-morpholinodithio) benzothiazole, etc.
  • sulfenamide accelerators for example, N-cyclohexyl) -2-Benzothiazils Phenamide (CBS), N, N′-dicyclohexyl-2-benzothiazylsulfenamide, etc.]
  • bismaleimide accelerators for example, N, N′-m-phenylenebismaleimide, N, N′-1,2, -Ethylene bismaleimide etc.
  • guanidines diphenyl
  • the proportion of the vulcanization accelerator is, for example, 0.1 to 15 parts by mass, preferably 0.3 to 10 parts by mass, and more preferably 0.5 to 5 parts by mass in terms of solid content with respect to 100 parts by mass of the rubber component. It may be about a part.
  • the ratio of the reinforcing agent is about 10 to 100 parts by weight (preferably 20 to 80 parts by weight, more preferably 30 to 70 parts by weight) with respect to 100 parts by weight of the total amount of rubber components. Also good.
  • the ratio of the softening agent is, for example, 1 to 30 parts by mass, preferably 3 to 20 parts by mass (eg 5 to 10 parts by mass) with respect to 100 parts by mass of the total amount of rubber components. It may be a degree.
  • the proportion of the antioxidant is, for example, 0.5 to 15 parts by weight, preferably 1 to 10 parts by weight, more preferably 2.5 to 7.5 parts by weight (particularly 3 parts by weight) with respect to 100 parts by weight of the total amount of rubber components. About 7 parts by mass).
  • the stretch rubber layer may be formed of a vulcanized rubber composition containing the rubber component exemplified in the compression rubber layer, and may contain short fibers in the same manner as the compression rubber layer. Further, the stretch rubber layer may be a layer formed of the same vulcanized rubber composition as the compressed rubber layer, and is a layer formed of the same vulcanized rubber composition as the compressed rubber layer except for the lubricant. There may be.
  • the rubber composition for forming the adhesive rubber layer is a metal component such as a rubber component (chloroprene rubber, etc.), a vulcanizing agent or a cross-linking agent (magnesium oxide, zinc oxide, etc.), like the vulcanized rubber composition of the compressed rubber layer.
  • a metal component such as a rubber component (chloroprene rubber, etc.), a vulcanizing agent or a cross-linking agent (magnesium oxide, zinc oxide, etc.), like the vulcanized rubber composition of the compressed rubber layer.
  • sulfur-based vulcanizing agents such as sulfur
  • co-crosslinking agents or crosslinking assistants such as maleimide-based crosslinking agents such as N, N'-m-phenylene dimaleimide), vulcanization accelerators (TMTD, DPTT, CBS) Etc.), enhancer (carbon black, silica etc.), softener (oils such as naphthenic oil), processing agent or processing aid (stearic acid, metal stearate, wax, paraffin etc.), anti-aging agent, Adhesion improver [resorcin-formaldehyde co-condensate, amino resin (condensate of nitrogen-containing cyclic compound and formaldehyde, eg hexamethylol melamine, hexaa Melamine resins such as lucoxymethyl melamine (hexamethoxymethyl melamine, hexabutoxymethyl melamine, etc.), urea resins such as methylol urea, benzoguanamine
  • the resorcin-formaldehyde cocondensate and amino resin may be an initial condensate (prepolymer) of a nitrogen-containing cyclic compound such as resorcin and / or melamine and formaldehyde.
  • the rubber component a rubber of the same type (diene rubber or the like) or the same type (chloroprene rubber or the like) as the rubber component of the rubber composition of the compressed rubber layer is often used. Further, the amounts of the vulcanizing agent or crosslinking agent, co-crosslinking agent or crosslinking aid, vulcanization accelerator, enhancer, softener and anti-aging agent are each in the same range as the rubber composition of the compressed rubber layer. You can choose from.
  • the ratio of the processing agent or processing aid (such as stearic acid) is 0.1 to 10 parts by weight, preferably 0.5 to 5 parts by weight with respect to 100 parts by weight of the rubber component.
  • the ratio of the adhesion improver is 0.1 to 20 parts by weight, preferably 1 to 10 parts by weight, more preferably 100 parts by weight of the rubber component. May be about 2 to 8 parts by mass.
  • the core wire (twisted cord) arranged at predetermined intervals in the belt width direction can be used.
  • the cores are arranged to extend in the longitudinal direction of the belt, and are usually arranged to extend in parallel at a predetermined pitch in parallel with the longitudinal direction of the belt.
  • the core wire only needs to be at least partially in contact with the adhesive rubber layer.
  • the adhesive rubber layer embeds the core wire, the core wire embeds between the adhesive rubber layer and the stretch rubber layer, and the adhesive rubber. Any form of embedding a core wire between the layer and the compressed rubber layer may be employed. Among these, the form in which the adhesive rubber layer embeds the core wire is preferable from the viewpoint that durability can be improved.
  • Examples of the fibers constituting the core wire include the same fibers as the short fibers.
  • these fibers from the viewpoint of high modulus, synthesis of polyester fibers (polyalkylene arylate fibers) mainly composed of C 2-4 alkylene arylates such as ethylene terephthalate and ethylene-2,6-naphthalate, aramid fibers, etc.
  • Inorganic fibers such as fibers and carbon fibers are widely used, and polyester fibers (polyethylene terephthalate fibers, polyethylene naphthalate fibers) and polyamide fibers are preferable.
  • the fiber may be a multifilament yarn.
  • the fineness of the multifilament yarn may be, for example, about 2000 to 10000 denier (particularly 4000 to 8000 denier).
  • the multifilament yarn may contain, for example, 100 to 5,000, preferably 500 to 4,000, more preferably about 1,000 to 3,000 monofilament yarns.
  • the core wire usually a twisted cord using multifilament yarn (for example, various twists, single twists, rung twists, etc.) can be used.
  • the average wire diameter (fiber diameter of the twisted cord) of the core wire may be, for example, 0.5 to 3 mm, preferably 0.6 to 2 mm, more preferably about 0.7 to 1.5 mm. Good.
  • the core wire may be subjected to adhesion treatment (or surface treatment) in the same manner as the short fiber in order to improve adhesion with the rubber component.
  • adhesion treatment or surface treatment
  • the core wire is preferably subjected to adhesion treatment with at least the RFL solution.
  • the reinforcing cloth is not limited to a form in which the reinforcing cloth is laminated on the surface of the compressed rubber layer.
  • the reinforcing cloth is applied to the surface of the stretched rubber layer (the surface opposite to the adhesive rubber layer).
  • the reinforcing layer may be embedded in the compressed rubber layer and / or the stretched rubber layer (for example, a mode described in JP 2010-230146 A).
  • the reinforcing cloth can be formed of, for example, a cloth material (preferably a woven cloth) such as a woven cloth, a wide angle sail cloth, a knitted cloth, and a non-woven cloth.
  • adhesion treatment for example, treatment with an RFL solution (immersion treatment) Or the like, or after the adhesive rubber and the cloth material are laminated, they may be laminated on the surface of the compression rubber layer and / or the stretch rubber layer.
  • the friction transmission belt of the present invention is obtained through a lubricant exposure step in which a lubricant containing wax is present on at least a part of the friction transmission surface.
  • the lubricant exposing step is not particularly limited as long as it is a method capable of exposing the lubricant to at least a part of the friction transmission surface.
  • the lubricant or the rubber composition containing the lubricant is attached to the friction transmission surface of the belt.
  • the lubricant can be present on the friction transmission surface for a long period of time, and the productivity of the belt can be improved.
  • a method of leaching the lubricant on the friction transmission surface through a cutting step is preferable.
  • the conventional process for manufacturing the friction transmission belt also serves as the lubricant exposure process.
  • lubricant exposing step there is no particular limitation, and a conventional method can be used according to the type of belt for the layer stacking step (belt sleeve manufacturing method).
  • a laminated body composed of a reinforcing cloth (lower cloth) and a compressed rubber layer sheet (unvulcanized rubber sheet) is arranged with teeth and grooves alternately with the reinforcing cloth facing down.
  • cog pad with the cog part formed by press-pressing at a temperature of 60-100 ° C (especially 70-80 ° C) (not completely vulcanized, in a semi-cured state) After producing a certain pad), both ends of the cog pad may be cut vertically from the top of the cog crest.
  • an inner mother die in which teeth and grooves are alternately arranged is covered on a cylindrical mold, and a cog pad is wound around the teeth and the grooves, and a joint is formed at the top of the cog crest, and this is wound.
  • the core wire (twisted cord) forming the core is spun into a spiral shape, and the first 2 to form a molded body by sequentially winding an adhesive rubber layer sheet (upper adhesive rubber: same as the adhesive rubber layer sheet), a stretch rubber layer sheet (unvulcanized rubber sheet), and a reinforcing cloth (upper cloth). May be.
  • the jacket is put on and the mold is placed in a vulcanizing can, and after passing through a vulcanizing process in which a belt sleeve is prepared by vulcanizing at a temperature of 120 to 200 ° C. (especially 150 to 180 ° C.), a cutter is used. And you may pass through the cutting process cut
  • the frictional heat generated when the belt sleeve is cut with a cutter or the like can promote the lubricant contained in the compressed rubber layer to bloom on the friction transmission surface.
  • the lubricant contained in the compressed rubber layer is bloomed on the friction transmission surface
  • the lubricant and short fibers are mixed and mixed (kneaded) with the rubber composition for forming the compressed rubber layer.
  • the short fibers are dispersed in the rubber composition in the kneading process.
  • a conventional method for example, rubber between a pair of calendar rolls provided with a predetermined gap is used.
  • a method described in JP-A-2003-14054 can be used. In this method, the unvulcanized sheet in which short fibers are oriented by such a method is placed and vulcanized so that the orientation direction of the short fibers is the width direction of the belt.
  • the production method of the present invention may further include a polishing step of polishing the short fibers by polishing at least the side surfaces of the compressed rubber layer among the friction transmission surfaces.
  • a method for polishing the compressed rubber layer a conventional method can be used. For example, a belt is suspended between a driving pulley and a driven pulley, and the belt is rotated while being rotated in a longitudinal direction under a predetermined tension.
  • a method of polishing with a polishing tool in contact with the side surface of the belt can be used.
  • a polishing tool for example, sanding paper or the like can be used.
  • the polishing method may be, for example, the polishing method described in Japanese Patent Application Laid-Open No. 2008-44017. Even in the polishing step, the lubricant contained in the compressed rubber layer can be promoted to bloom on the friction transmission surface due to frictional heat generated during polishing.
  • the transmission efficiency is an index for the belt to transmit the rotational torque from the drive pulley to the driven pulley.
  • the higher the transmission efficiency the smaller the belt transmission loss and the better the fuel efficiency.
  • the transmission efficiency can be obtained as follows.
  • the rotational torque T 1 of the driving pulley can be expressed by ⁇ 1 ⁇ Te ⁇ r 1 .
  • Te is an effective tension obtained by subtracting the loose side tension (tension on the side where the belt faces the driven pulley) from the tension side tension (tension on the side where the belt faces the driving pulley).
  • the rotational torque T 2 of the driven pulley is represented by ⁇ 2 ⁇ Te ⁇ r 2 .
  • the transmission efficiency T 2 / T 1 is calculated by dividing the rotational torque T 2 of the driven pulley by the rotational torque T 1 of the drive pulley, and can be expressed by the following equation.
  • the value of transmission efficiency is 1 if there is no transmission loss, and the value decreases if there is a transmission loss. That is, the closer to 1, the smaller the belt transmission loss and the better the fuel economy.
  • Chloroprene rubber Denka Co., Ltd. “Denka Chloroprene DCR” Aramid short fiber: “Conex short fiber” manufactured by Teijin Techno Products Limited, average fiber length 3 mm, average fiber diameter 14 ⁇ m Vinylpyridine-styrene-butadiene copolymer latex: Nippon Zeon Co., Ltd. Wax A: Seiko Chemical Co., Ltd. “Suntite C”, a mixture of paraffin and microcrystalline wax, melting point of about 50 ° C. Wax B: “Suntite R” manufactured by Seiko Chemical Co., Ltd., a mixture of paraffin and microcrystalline wax, melting point of about 80 ° C.
  • Wax C “Suntite SW” manufactured by Seiko Chemical Co., Ltd., a mixture of paraffin and oleic acid amide, melting point of about 120 ° C.
  • Fatty acid amide “Amide AP-1” manufactured by Nippon Kasei Co., Ltd., Stearic acid amide, melting point 101 ° C.
  • Ether ester plasticizer “ADEKA SIZER RS-700” manufactured by ADEKA Corporation Graphite: “AT-20” manufactured by Oriental Sangyo Co., Ltd.
  • Silica “Nipsil VN3” manufactured by Tosoh Silica Corporation
  • Anti-aging agent “Nonflex OD3” manufactured by Seiko Chemical Co., Ltd.
  • Core wire A fiber obtained by bonding a cord of total denier 6,000, which is made by twisting 1,000 denier PET fibers in a 2 ⁇ 3 twist configuration with an upper twist coefficient of 3.0 and a lower twist coefficient of 3.0.
  • Friction coefficient measurement As shown in FIG. 8, the friction coefficient of the belt is such that one end of the cut belt 21 is fixed to the load cell 22, and a load 23 of 3 kgf is placed on the other end to the pulley 24.
  • the belt 21 was wound around the pulley 24 with a belt winding angle of 45 °. Then, the belt 21 on the load cell 22 side was pulled at a speed of 30 mm / second for about 15 seconds, and the average friction coefficient of the friction transmission surface was measured. In the measurement, the pulley 24 was fixed so as not to rotate.
  • Table 4 and 5 when the friction coefficient of the comparative example 1 was set to "100", it showed by the relative value which converted the friction coefficient of each Example and the comparative example.
  • the high-load running test was performed using a two-axis running test machine including a driving (Dr.) pulley 42 having a diameter of 50 mm and a driven (Dn.) Pulley 43 having a diameter of 125 mm.
  • a low-edge cogged V-belt 41 is hung on each pulley 42, 43, a load of 3 N ⁇ m is applied to the driven pulley 43 at a rotation speed of 3000 rpm of the driving pulley 42, and the belt 41 is run in a room temperature atmosphere. .
  • the surface temperature of the running belt reached a maximum of 90 ° C.
  • the high-speed running test was performed using a two-axis running test machine including a driving (Dr.) pulley 52 having a diameter of 95 mm and a driven (Dn.) Pulley 53 having a diameter of 85 mm.
  • the low-edge cogged V-belt 51 is hung on each pulley 52, 53, the rotational speed of the driving pulley 52 is 5000 rpm, a load of 3 N ⁇ m is applied to the driven pulley 53, and the belt 51 is run in a room temperature atmosphere.
  • the surface temperature of the running belt reached a maximum of 60 ° C.
  • the rotational speed of the driven pulley 53 was read from the detector, and the transmission efficiency was obtained from the above formula.
  • Table 4 and 5 when the transmission efficiency of the comparative example 1 was set to "100", it showed by the relative value which converted the transmission efficiency of each Example and the comparative example.
  • the transmission efficiency test was evaluated based on the following criteria by combining the results of (2) high-load running test and (3) high-speed running test.
  • A 100 or more for both high load conditions and high speed conditions, and more than 102 B: 100 to 102 for both high load conditions and high speed conditions
  • C Any of high load conditions and high speed conditions is less than 100.
  • the endurance running test was performed using a two-axis running test machine including a driving (Dr.) pulley 62 having a diameter of 50 mm and a driven (Dn.) Pulley 63 having a diameter of 125 mm.
  • a low-edge cogged V-belt 61 is hung on each pulley 62, 63, a rotational speed of the driving pulley 62 is 5000 rpm, a load of 10 N ⁇ m is applied to the driven pulley 63, and the belt 61 is kept at an ambient temperature of 80 ° C. for a maximum of 40 hours. I drove it.
  • the belt surface temperature during running reached a maximum of 120 ° C.
  • the side surface of the cog portion of the low edge cogged V-belt 61 after running is visually observed, and the crack generation ratio is calculated from the number of cog portions where cracks originated from the short fibers per 100 cog portions. Evaluated by criteria.
  • Examples 1 to 11 and Comparative Examples 1 to 7 (Formation of rubber layer)
  • the rubber compositions shown in Tables 1 and 2 compressed rubber layer, stretched rubber layer) and Table 3 (adhesive rubber layer) are each kneaded with rubber using a known method such as a Banbury mixer. And rolled rubber sheets (compression rubber layer sheet, stretch rubber layer sheet, adhesive rubber layer sheet).
  • the short fibers were bonded with an RFL solution (containing resorcin and formaldehyde and vinylpyridine-styrene-butadiene rubber latex as a latex), and short fibers having a solid content of 6 mass% were used.
  • RFL solution 2.6 parts by mass of resorcin, 1.4 parts by mass of 37% formalin, 17.2 parts by mass of vinylpyridine-styrene-butadiene copolymer latex, and 78.8 parts by mass of water were used.
  • the laminate of the reinforcing fabric and the compressed rubber layer sheet (unvulcanized rubber) is placed in a flat cogged mold with teeth and grooves alternately arranged with the reinforcing fabric down, and pressed at 75 ° C.
  • a cog pad (not completely vulcanized but in a semi-vulcanized state) in which the cog part was molded by pressurization was produced. Next, both ends of the cog pad were cut vertically from the top of the cog crest.
  • the sleeve is cut into a V-shaped cross-section with a cutter, and both side surfaces of the belt are polished, and a low-edge cog V which is a belt having a structure shown in FIG. 2, that is, a transmission belt having a cog on the belt inner peripheral side.
  • a belt (size: upper width 22.0 mm, thickness 11.0 mm, outer peripheral length 800 mm) was produced.
  • a lubricant layer was formed on the surface of the compressed rubber layer (friction transmission surface) after polishing, and short fibers protruded from the surface of the lubricant layer with an average height of 60 ⁇ m. .
  • an electron micrograph of the surface of the compressed rubber layer of Example 4 is shown in FIG. The white part of the drawing is short fiber and the black part is lubricant.
  • Tables 4 and 5 show the evaluation results of the belts obtained in Examples and Comparative Examples.
  • Comparative Examples 2 and 3 are examples in which the amount of short fibers was increased from that of Comparative Example 1 without adding wax. As the amount of short fibers increased, the friction coefficient decreased and the transmission efficiency (fuel efficiency) improved, but the crack generation rate increased in the durability test.
  • Comparative Examples 4 to 7 did not contain wax and used fatty acid amide (Comparative Example 4), ether ester plasticizer (Comparative Example 5), graphite (Comparative Example 6), and silicone oil (Comparative Example 7).
  • the coefficient of friction was not significantly lowered from Comparative Example 1, and the transmission efficiency was not improved.
  • Comparative Examples 5 to 7 the crack generation rate slightly increased.
  • Example 1 In Examples 1 to 11 to which wax was added, the friction coefficient was lower than that in Comparative Example 1, and the transmission efficiency was improved. Moreover, when Examples 1, 5 and 10 were removed, no crack was generated, and the durability was excellent. In Example 5 in which 10 parts by mass of wax was blended and Example 10 in which 20 parts by mass of short fibers were blended, cracks were slightly generated, but cracks were compared with Comparative Examples 2 and 3 in which only the amount of short fibers was increased. The occurrence rate of has significantly decreased.
  • Examples 1 to 5 are examples in which wax A (melting point: about 50 ° C.) was blended with Comparative Example 1, and the transmission efficiency under higher speed conditions (belt surface temperature maximum 60 ° C.) than Comparative Example 1 as the blending amount increased. Improved.
  • the transmission efficiency under high load conditions maximum 90 ° C. was lower than that in Comparative Example 1 in Examples 3 to 5 in which the amount of wax A was increased. This is probably because the belt surface temperature is as high as 90 ° C. at the maximum from the melting point of wax A (about 50 ° C.), so that the wax deposited on the friction transmission surface is dissolved and the lubricating effect is lowered.
  • Example 9 in which 6 parts by mass of wax C having a high melting point (melting point: about 120 ° C.) was mixed with Example 4 in which 6 parts by mass of wax A having a low melting point (melting point: about 50 ° C.) was also blended.
  • the transmission efficiency (maximum 90 ° C.) was high and the transmission efficiency under high speed conditions (belt surface temperature maximum 60 ° C.) was low.
  • the reason why the transmission efficiency was low under the high-speed condition is considered to be that the melting point of the wax was about 60 ° C. higher than the belt surface temperature, and it was difficult to bloom on the friction transmission surface.
  • Examples 6 to 8 in which waxes having different melting points are used together are good in transmission efficiency under both high load conditions (maximum 90 ° C.) and high speed conditions (maximum 60 ° C.), and there is no occurrence of cracks. , Balance between transmission efficiency and durability.
  • Example 10 is the same as Example 8 in that 2 parts by mass of waxes A, B, and C are blended, and the transmission efficiency is good. However, the amount of short fibers is larger than Example 8, or the crack generation rate is high. Slightly increased.
  • Example 11 is an example in which wax and fatty acid amide are used in combination as a lubricant.
  • Comparative Example 4 in which only fatty acid amide was blended, the durability was insufficient, and in Example 3 in which only wax was blended, the transmission efficiency under a high load condition was slightly low, whereas Example in which wax and fatty acid amide were used in combination In No. 11, both transmission efficiency and durability were judged as A, and a remarkable effect was obtained by combining these lubricants.
  • the wax C used in Example 9 was a mixture of paraffin and oleic acid amide, and both transmission efficiency and durability could be achieved without adding a separate fatty acid amide.
  • the friction transmission belt of the present invention can be applied to, for example, a V belt (wrapped V belt, low edge V belt, low edge cogged V belt), V ribbed belt, flat belt, and the like.
  • a V-belt (transmission belt) used in a transmission continuously variable transmission in which the gear ratio changes steplessly during belt travel, such as a motorcycle, an ATV (four-wheel buggy), a snowmobile, etc.
  • the present invention is preferably applied to a low edge cogged V belt and a low edge double cogged V belt used in a transmission.

Abstract

La présente invention concerne une courroie de transmission à frottement, laquelle courroie a une surface de transmission à frottement dont au moins une partie est apte à venir en contact avec une poulie, et qui comporte une couche de caoutchouc comprimé constituée par un produit obtenu par vulcanisation d'une composition de caoutchouc contenant un composant de caoutchouc et des fibres courtes, un lubrifiant contenant de la cire étant présent sur au moins une partie de la surface de transmission à frottement.
PCT/JP2016/087905 2015-12-22 2016-12-20 Courroie de transmission à frottement et son procédé de fabrication WO2017110790A1 (fr)

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EP16878679.6A EP3396202B1 (fr) 2015-12-22 2016-12-20 Courroie de transmission à frottement et son procédé de fabrication
CN201680075221.2A CN108431450B (zh) 2015-12-22 2016-12-20 摩擦传动带及其制造方法

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WO2019009339A1 (fr) * 2017-07-04 2019-01-10 三ツ星ベルト株式会社 Courroie à nervures en v
JP2019015400A (ja) * 2017-07-04 2019-01-31 三ツ星ベルト株式会社 Ｖリブドベルト
US10716912B2 (en) 2015-03-31 2020-07-21 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
US11324908B2 (en) 2016-08-11 2022-05-10 Fisher & Paykel Healthcare Limited Collapsible conduit, patient interface and headgear connector

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US10716912B2 (en) 2015-03-31 2020-07-21 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
US11904097B2 (en) 2015-03-31 2024-02-20 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
US11324908B2 (en) 2016-08-11 2022-05-10 Fisher & Paykel Healthcare Limited Collapsible conduit, patient interface and headgear connector
WO2019009339A1 (fr) * 2017-07-04 2019-01-10 三ツ星ベルト株式会社 Courroie à nervures en v
JP2019015400A (ja) * 2017-07-04 2019-01-31 三ツ星ベルト株式会社 Ｖリブドベルト
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