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    • 专利摘要:
    drive belt. the durability of a belt is improved by improving the rubber itself while enhancing its tear resistance with respect to a cord, fabric or short fiber. a timing belt (10) comprises a runner body (13) integrally formed by a rubber tooth (11) provided on one surface side thereof, a spare rubber (12) provided on the other surface side, and an embedded cord (14) spirally wound on a portion delimited between the rubber tine (11) and the spare rubber (12) and extending in the longitudinal direction of the belt. a lining fabric (20) coating the rubber tooth (11) adheres to the surface of the rubber tooth (11) by vulcanizing molding a rubber composition including rubber, such as an hnbr, resorcinol, a melamine compound, and things like that.
    公开号:BR112014012264B1
    申请号:R112014012264-4
    申请日:2012-02-01
    公开日:2021-06-15
    发明作者:Mitsuhiro Yamada；Keiji Sakamoto；Shinji Uchigashima
    申请人:The Gates Corporation；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    [001] The present invention is aimed at an energy transmission belt, and in particular, a toothed belt used in an environment under high temperature and load.
    [002] Timing belts have found wide use for power transmission in automobile internal combustion engines, and the like. Recently, toothed belts have been intensively used in environments under heavy load and high temperature. In other words, reducing the dimensions of engines or the like require the use of toothed belts close to environments at higher temperatures and with smaller proportions. Conventionally, to improve, for example, the durability of a timing belt in an environment under high load, there is the incorporation of a short fiber or the like in the tooth rubber, the rubber containing a relatively modulus based on so-called performance technology comes to be employed as tooth rubber.
    [003] Furthermore, in an environment under elevated temperature, the amount of deformation sustained by the teeth of a timing belt increases. Therefore, the amount of internal heat generated increases, and, consequently, the timing belt is more prone to thermal degradation. In addition, the rubber and tissue surrounding the tooth root portions are repeatedly stretched to a great extent, with a greater propensity for breakage along the timing belt. Conventionally, fabric, short fiber, cord, and the like are subjected to a surface treatment with RFL, rubber cementing, or the like to prevent breakage and the like, so that the rubber grip forces with these members are accentuated.
    [004] Furthermore, according to the description given, for example, in Patent Document 1, a V-ribbed belt is known to have a structure of the resorcin-formalin resin type or a melamine resin incorporated into the joint. to a grip rubber to accentuate the grip force between the cord and the grip rubber where the cord is to be embedded. PATENT DOCUMENT 1: PUBLICATION OF JAPANESE PATENT APPLICATION No. 2008-261489 SUMMARY OF THE INVENTION TECHNICAL PROBLEMS
    [005] Recently there has been a market demand for a growing improvement of a higher level of durability, and therefore, it has become difficult to sufficiently improve this durability to meet the required level if using only high-grade rubber strength and short fiber and by treating the surface of several members via RFL or rubber cementation. In addition, a tooth rubber having a high modulus tends to lose adhesion to the fabric or short fiber experiencing a weakening of the rubber at elevated temperature. Furthermore, when incorporating a resorcin-formalin or melamine resin with the tack rubber as described in Patent Document 1, tack strength can be improved, however, tear resistance and the like rubber itself may be compromised, so that breakages, shears and the like with the tooth may be more likely to occur in these situations.
    [006] In this regard, an objective of the present invention is to improve the adhesion force between the rubber and the various components, while intensifying the strength of the rubber itself by improving the resistance to tearing and things. even under high temperature conditions, thus improving the durability of the belt used in an environment under high loads and temperatures. SOLVING TECHNICAL PROBLEMS
    [007] An energy transmission belt according to the present invention consists of a portion of rubber molded by means of vulcanization of a rubber composition including rubber, resorcinol and a melamine compound.
    [008] In general, the rubber portion is adhered to a fabric or cord, or includes a short fiber embedded therein. In the present case, a short aramid fiber is preferably embedded inside the rubber portion. Furthermore, the rubber preferably includes a hydrogenated acrylonitrile rubber. Furthermore, the rubber composition preferably further includes silica. Furthermore, at least one of the strands, the fabric and the short fiber is preferably subjected to the RFL treatment, and includes RFL components adhered to their surfaces.
    [009] The energy transmission belt consists of a toothed belt, preferably containing tooth rubber. Furthermore, the rubber portion preferably constitutes at least a part of the tooth rubber. Preferably a hexamethoxy methylolmelamine compound is used as the melamine compound. Note that the hexamethoxy methylolmelamine compound comprises, for example, hexamethoxy methylolmelamine, a partially condensed oligomer thereof, or a mixture of both.
    [010] For example, the timing belt includes a cord, a tooth rubber disposed on one side of the surface, a bottom rubber disposed on the other side of the surface, and a lining fabric covering the surface side of the rubber. tooth, the surface side and the other surface side locating each other through the cord. In this case, at least one side of the tooth rubber surface is formed by the rubber portion, and the lining fabric adheres to the rubber portion.
    [011] A method of manufacturing an energy transmission belt according to the present invention comprises molding a portion of rubber constituting at least a part of the energy transmission belt by vulcanizing a rubber composition including the rubber, resorcinol and melamine compound. ADVANTAGEOUS EFFECTS OF THE INVENTION
    [012] In the present invention, specific internal tackifiers are incorporated into the rubber composition. Therefore, the durability of the belt can be improved by increasing the strength of the rubber itself, while intensifying the adhesion strength of the rubber to cord, fabric, short fiber, and the like. BRIEF DESCRIPTION OF THE DRAWINGS
    [013] Fig. 1 comprises a view of the cross section of a timing belt according to a first embodiment of the present invention.
    [014] Fig. 2 is a view of the cross section showing a method of manufacturing a timing belt according to the first modality of the present invention.
    [015] Fig. 3 comprises a view of the cross section of a timing belt according to a second embodiment of the present invention.
    [016] Fig. 4 presents a profile of a durability test under high load.
    [017] Fig. 5 comprises of a graph showing the results of the durability test under high load. REFERENCE NUMBER LISTING 10 Drive belt (power drive belt) 11 tooth rubber 12 bottom rubber 13 belt body 14 cord 20 lining fabric (fabric) DESCRIPTION OF MODALITIES
    [018] There follows a description of the embodiments of the present invention having the drawings as references.
    [019] Fig. 1 shows a toothed belt of a first modality of the present invention. The toothed belt 10 is formed in a continuous format, being used wrapped around the transmission pulleys and under transmission (not shown) with an engine of internal combustion and the like, for example. The toothed belt 10 consists of a timing belt that transmits torque (transmission force) from a transmission pulley to a pulley driven by means of synchronized energy transmission.
    [020] The toothed belt 10 includes a belt body 13 and a cord 14. The belt body 13 is integrally formed by a tooth rubber 11 provided on one surface side thereof and a bottom rubber 12 provided on the other side of surface. The cord 14 is wrapped in a spiral shape and embedded in a boundary portion between the tooth rubber 11 and the bottom rubber 12, and embedded to extend in the longitudinal direction of the belt. The cord 14 adheres to the tooth rubber 11 and the bottom rubber 12.
    [021] In tooth rubber 11, a tooth portion 15 and a tooth base portion 16 are alternatively formed along a surface side of the belt body 13 along the longitudinal direction of the belt. A lining fabric 20 (fabric) covering the tooth rubber 11 (the tooth portion 15 and the tooth base portion 16) adheres together to a surface of the tooth rubber 11 (i.e., a surface of the tooth portion belt 13).
    [022] A short fiber 25 formed by nylon fiber, a modified nylon fiber obtained by modifying nylon, an aramid fiber, or the like, having a fiber length of around 0.5 to 10 mm comes to be loaded into the 11 tooth rubber. A short aramid fiber is preferably loaded into the 11 tooth rubber to further increase the modulus of the 11 tooth rubber. More so when an aramid fiber comes to be loaded, the two internal tackifiers described later are more likely to improve the physical properties of rubber, such as the tear strength and tack strength of short fiber rubber 25 and the like. For example, short fiber 25 is loaded, in an amount ranging from around 4 to 36 parts by weight, preferably around 10 to 25 parts by weight, and particularly preferably around 12 to 16 parts by weight at the edge. -tooth split 11, with respect to 100 parts by weight of a matrix described below.
    [023] Preferably, the short fiber 25 is subjected to a treatment containing a treatment agent that includes the presence of a resin component capable of reacting with the internal tackifiers described below, and preferably, coming to be submitted, for example, to an RFL (resorcin-formalin-latex) treatment. The RFL treatment is carried out via an impregnation treatment, where the short fiber is immersed in an RFL treatment liquid and then dried by heating. The RFL treatment liquid includes latex and a resorcin-formaldehyde condensate, which are diluted, for example, in water or the like. Furthermore, the resin component can consist of a urethane resin or an epoxy resin.
    [024] The short fiber 25 is oriented substantially in the direction of the belt thickness in a central region of the tooth portion 15. As the short fiber 25 approaches the tooth surface from the central region, the orientation of the short fiber 25 becomes slanted from the thickness direction so as to extend along the tooth surface. The short fiber 25 is substantially oriented in the longitudinal direction of the belt proximate the top portion of the tooth portion 15 and the tooth base portion 16.
    [025] The 11 tooth rubber is obtained by vulcanizing and molding a rubber composition including rubber and various additives. The rubber composition includes a hydrogenated acrylonitrile rubber (HNBR) as the major rubber component, and may include other rubber components such as a hydrogenated carboxylated acrylonitrile rubber (HXNBR) and an acrylonitrile rubber (NBR).
    [026] The rubber composition used for molding the tooth rubber preferably includes an unsaturated α,e-ethylene metal carboxylate as a matrix, in addition to the presence of rubber. However, unsaturated α,e-ethylenic metal carboxylate does not have to be included. The α,e-ethylenic metal unsaturated carboxylate is included, for example, in an amount ranging from 0.2 to 0.4 with respect to the matrix (the total weight of the rubber and the α metal unsaturated carboxylate ,e-ethylene).
    [027] The unsaturated α,e-ethylenic metal carboxylate comes to be formed by ionic binding of an unsaturated α,e-ethylene carboxylate acid containing metal. For example, a monocarboxylic acid such as acrylic acid or methacrylic acid, or a dicarboxylic acid such as maleic acid, fumaric acid, itaconic acid, or citraconic acid come to be employed as the α,e-ethylenic unsaturated carboxylate, being preferably methacrylic acid is used. For example, zinc, magnesium, calcium, barium, titanium, chromium, iron, cobalt, nickel, aluminum, brass, lead, or the like can be used as the metal, with zinc being preferred. Thereby, for example, zinc dimethacrylate is used as the metal salt.
    [028] The rubber composition employed to mold the 11 tooth rubber further includes resorcinol and a melamine compound as the internal tackifiers. In this modality, the inclusion of these compounds leads to polymerization of the melamine compound and resorcinol, for example, by heating during molding by vulcanization, and in turn during the construction of a network structure. Consequently, the tear strength and the like of the tooth rubber 11 is accentuated and the adhesion strength of the tooth rubber 11 to the cord 14, the lining fabric 20, and the short fiber 25 is also accentuated.
    [029] The melamine compound is, for example, a melamine compound having at least partially methoxymethylated amino groups. Specific examples of the melamine compound include hexamethoxy methylolmelamine compounds, such as hexamethoxy methylolmelamine, partially condensed oligomers thereof, and mixtures thereof. Preferably, the melamine compound has a viscosity of 25°C (according to DIN19268) of around 3000 to 8000 mPa-s.
    [030] Resorcinol is incorporated in an amount ranging from 0.3 to 8 parts by weight, preferably from 0.5 to 4.5 parts by weight, and more preferably to 1.5 to 3.0 parts by weight in to 100 parts by weight of the matrix of the rubber composition. Furthermore, the incorporated parts (weight) of the melamine compound are preferably smaller than those referring to resorcinol. The melamine compound is incorporated in an amount ranging from 0.2 to 5 parts by weight, preferably from 0.3 to 2.7 parts by weight, and more preferably from 0.9 to 1.8 parts by weight relative to 100 parts by weight of the rubber composition matrix. If the incorporated amount of any melamine and resorcinol compound exceeds the above mentioned range, tear strength, crack strength, and the like tend to be poor. On the other hand, if the incorporated amount is less than the range described above, it is difficult to improve the adhesion strength.
    [031] The rubber composition employed for molding the 11 tooth rubber preferably includes silica. Silica is used in the form of fine particles, powder, or the like. In this modality, the water contained in the silica causes the melamine compound to dissolve formaldehyde. Then, resorcinol is polymerized with formaldehyde, and the melamine compound is also polymerized. Consequently, adhesion strength, tear resistance, and the like are improved in the manner described above. The amount of silica is from 5 to 50 parts by weight, and preferably from 20 to 40 parts by weight, relative to 100 parts by weight of the rubber composition matrix.
    [032] The rubber composition employed to mold the 11 tooth rubber further includes known additives for rubber, such as a vulcanizing agent, a plasticizer, a lubricant, and carbon black. In this embodiment, an organic peroxide based vulcanizing agent is preferably used as the vulcanizing agent.
    [033] Although without any restriction, the lining fabric 20 consists, for example, of a fabric including first threads (for example, warp threads) extending along the longitudinal direction of the belt and second threads (eg warp threads) extending along the width direction of the belt, which are weaved. In the lining fabric 20, for example, the first threads are made of elastic threads, and the second threads are made of inelastic threads. Thus, the lining fabric 20 is elastic in the longitudinal direction of the belt, being more easily molded into a corrugated shape in preforming. In this embodiment, at least a part of the fiber constituting the lining fabric 20 preferably comprises an aramid fiber for improving the strength of the belt surface, and, for example, at least part of the first threads preferably comprises of an aramid fiber. Furthermore, the lining fabric 20 is subjected to impregnation treatment or the like, such as RFL treatment, if necessary.
    [034] The compound rubber used to mold the 11 tooth rubber is prepared as follows. Firstly, short fiber type additives, silica and the like for the rubber composition that are not the vulcanizing agent and the internal tackifiers (resorcinol and melamine compound), are kneaded together with the rubber at a temperature higher than the temperature for the primary kneading described below, Thereafter, the internal tackifiers are added, and the mixture is kneaded further (primary kneading). In this primary kneading, the kneading temperature is preferably at 100 °C or higher. Kneading at this temperature results in the release of water from the silica along with the composition, and facilitates the donation of formaldehyde from the melamine compound in the manner described above. In addition, the vulcanizing agent is added to the primary kneading mixture, and the resulting mixture is kneaded at a temperature lower than the vulcanizing temperature of the vulcanizing agent (lower than the kneading temperature for the primary kneading). In this way the rubber composition (secondary kneading) is obtained. The rubber compound is set up in a sheet, and used as an 11' tooth rubber sheet (see Fig. 2). However, the rubber kneading method is not limited to this method, and for example, additives other than the vulcanizing agent may be added to the primary knead or secondary knead as appropriate.
    [035] As the bottom rubber 12, it is understood that the rubber used as the bottom rubber for a conventionally known toothed belt can be used, and the bottom rubber 12 preferably does not load on the short fiber. Furthermore, the rubber used as the bottom rubber 12 is preferably formed from HNBR as in the case of the tooth rubber 11, and may include other rubber components, if necessary.
    [036] Next, there is a description of a timing belt 10 manufacturing method of this modality based on Fig. 2. In this modality, the lining fabric 20 subjected to a treatment by impregnation or the like is initially pre- shaped by a known conventional method into a corrugated shape having an alternating tooth portion 23 and the tooth base portion 24.
    [037] Subsequently, the 11' tooth rubber plate adheres under pressure to a surface of the lining fabric 20 presenting the corrugated shape. Thereby, a lining fabric provided with rubber 26 is obtained. The tooth rubber plate 11' is pressed against the lining fabric 20. Thereby, the tooth rubber plate 11' is adhered under pressure it is relatively thick in the tooth portion 23, and relatively thin in the tooth base portion 24. Furthermore, the short fiber 25 loaded in the tooth rubber plate 11', which came to be incorporated along the longitudinal direction, if is angled as appropriate while being adhered under pressure, as can be seen from Fig. 2, and being oriented substantially in the same manner as proceeded for the short fiber in toothed belt 10.
    [038] The rubberized lining fabric 26 obtained in this way is wrapped around a serrated mold 30. The serrated mold 30 has a cylindrical shape, and presents an outer peripheral surface where the recessed portions 31 and the suspended portions 32 are provided alternatively along the circumferential direction. Each tooth portion 23 of the rubberized liner fabric 26 is disposed within a corresponding set back portion 31. Note that, as a general rule, each tooth portion 23 of the rubberized liner fabric 26 has a shape that is not fully fitted with the set-back portion 31, with a space between the tooth portion 23 and the set-back portion 31.
    [039] Thereafter, the cord 14 is spirally wound around the toothed rubber plate 11', and the bottom rubber plate 12' is further wrapped around the cord 14. Thereafter, the toothed mold 30 is housed in a vulcanization chamber (not shown0). Note that the tooth rubber sheet 11' and the bottom rubber sheet 12' comprise of unvulcanized rubber sheets to be converted to tooth rubber 11 and bottom rubber 12 after molding by vulcanization.
    [040] In the vulcanization chamber, the lining fabric provided with rubber 26 and the like, which is wrapped around the toothed mold 30 is heated with steam, for example, and is pressurized from outside to inside with a vulcanization bag or the like provided in the vulcanization chamber. As a result of the pressurization and heating, the spaces inside the recessed portions 31 end up being completely eliminated, giving the integration of the lining fabric 20, the rubber sheets 11' and 12', and the cord 14 with each other by vulcanizing the 11' and 12' rubber sheets and the like. Thus, one has the molding of a belt slab. The belt slab comes out of the mold from the toothed mold 30, subjected as appropriate to grinding or the like, then being cut into a piece having a predetermined width. In this way, the timing belt 10 is obtained (see Fig. 1).
    [041] In this modality, the incorporation of the two internal adhesion agents described above together with the 11 tooth rubber introduces an improvement in strength, such as the tear resistance of the rubber itself, and also improves the adhesion strength with the cord 14, lining fabric 20, and short fiber 25. Therefore, the belt's durability is improved even under an environment of high load and temperature.
    [042] Fig. 3 shows a timing belt according to a second embodiment of the present invention. The second modality is identical to the first modality, except for the tooth rubber structure. The differences between the first and second modalities are described below.
    [043] In the second embodiment, the tooth rubber 11 includes a rubber core portion 37 and a tooth surface rubber portion 38. The rubber core portion 37 takes into account a large proportion of the den portion. 15, being laminated to the bottom rubber 12, and having a shape mating with the shape of the tooth portion 15. The tooth surface rubber portion 38 is thin, laminated to the rubber core portion 37, being disposed on a surface of the tooth rubber 11. In addition, the lining fabric 20 overlays and is adhered to the outer peripheral surface of the tooth surface rubber portion 38.
    [044] In this embodiment, the tooth surface rubber portion 38 is obtained by molding the same rubber composition identical to that referring to tooth rubber 11 of the first embodiment, except that the short fiber is not included. In other words, the tooth surface rubber portion 38 comes to be molded by employing a rubber composition where silica, resorcinol, melamine compound, and the like are incorporated. On the other hand, the rubber core portion 37 is obtained by molding a rubber composition having the same constitution as that referring to tooth rubber 11 of the first modality, except that resorcinol and melamine compound do not are incorporated. Note that since the material, orientation, and the like pertaining to short fiber 25 in the core portion of the rubber are identical to those of the first modality, descriptions thereof are omitted.
    [045] In this embodiment, the two internal tackifiers described above are incorporated into the rubber portion of tooth surface 38 in the manner described above. Therefore, it is possible to improve the adhesion strength of the tooth rubber next to the covering fabric 20, and also to improve the strength of the rubber 11 next to the tooth rubber 11 in the vicinity of the tooth surface. Furthermore, once the tooth surface rubber 38 is provided, the adhesion between the lining fabric 20 and the tooth rubber 11 is not obstructed by the short fiber, being more likely to have an improvement in strength. the grip in this range.
    [046] Note that in this modality, the rubber core portion 37 may be obtained by molding a rubber composition where resorcinol, melamine compound, and the like are incorporated, as in the case of tooth surface rubber portion 38. Furthermore, the method of manufacturing a timing belt of this embodiment is identical to that of the first embodiment, except for the two layers (the tooth rubber surface plate and the plate rubber core) will be pressure-adhered to the lining fabric rather than to the rubber sheet. Therefore, their descriptions are omitted.
    [047] Note that in each of the modalities described above, the rubber constituting each of the rubbers, tooth 11 and bottom 12 may come to include rubber components such as EPDM (ethylene-propylene-diene copolymer ), in addition to the HNBR, NBR, and HXNBR described above or may include a rubber component other than HNBR as the main component.
    [048] Furthermore, in each of the modalities described above, the lining fabric 20 and the cord 14 preferably have surfaces where a resin component capable of reacting with the internal adhesion agents comes to be fixed, for example, by subjecting the lining fabric 20 and cord 14 to RFL treatment or the like, as in the case of short fiber 25. Examples
    [049] Examples are presented below in the form of specific examples of the present invention. However, the present invention is not restricted to the Examples shown below.
    [050] In each of the Examples and Comparative Examples, there is a presentation of a rubber composition containing a constitution shown in Table 1, which was obtained in a manner as follows. Specifically, the additives that did not comprise the vulcanizing agent and the internal adhesion agents (resorcinol and hexamethoxy methylolmelamine compound) shown in Table 1 were added to a matrix, with the mixture being kneaded into a temperature between 120° to 160°C. Then, the internal tackifiers were added thereto, and the mixture was subjected to secondary kneading below 100°C.
    * 1 "-" indicating that item has not been incorporated, or has not been determined. * 2 The numerical value of the matrix and each of the additives such as short fiber indicates an amount in parts by weight. * 3 The numerical value of the matrix and each of the additives such as short fiber indicates an amount in parts by weight. *4 Technora (product name) comprising of a short aramid fiber of type para contains a fiber length of 1 mm, was employed as the short aramid fiber. Note that, in Table 1, the "short aramid fiber" indicates a short aramid fiber subjected to the RFL treatment (rate by weight of RF/L = 1/5, with the NBR latex being used as the latex) , and short aramid fiber (untreated) being an indication of a short aramid fiber not subjected to any type of impregnation treatment, such as the RFL treatment. * 5 The hexamethoxy methylolmelamine compound used comprised a partial condensation oligomer of hexamethoxy methylolmelamine having a viscosity at 25°C of 5500 Mpa^s (according to DIN 19268). * 6 The sign * in Table 1 comprises an indication of which aramid strand came to be employed as the strand. Evaluation of Physical Properties of Rubber Compositions
    [051] The physical properties of the rubber composition of each of the Examples and Comparative Examples were evaluated as follows. Table 1 presents the results. Stress due to fatigue with Rupture (Tsb)
    [052] Rubber samples having a round type shape No. 5 were prepared by vulcanizing and molding the rubber composition of each of the Examples and Comparative Examples at 160°C for 20 minutes under a pressure of 150 kgf. Through the use of rubber samples, the fatigue stress at rupture (Tsb) came to be measured in a normal environment (23°C) and a heated environment (120°C) in accordance with the JIS K6251 standard. Note that the short fiber was oriented along the direction of stress on the rubber samples. Tear Resistance (TR)
    [053] Vulcanized rubber samples, termed "test pieces configured at undefined angles" were prepared from the rubber composition of each of the Examples and Comparative Examples under the same vulcanization conditions as those established in fatigue stress next to the rupture (Tsb). Through the use of rubber samples, the tear strength (TR) came to be measured under a normal environment (23°C) and a heated environment (120°) according to the JIS K6252 standard. Peel Resistance with the Lining Fabric (TF)
    [054] The samples were obtained, each of which, from adhering to an unvulcanized rubber sheet made from a rubber composition of each of the Examples and Comparative Examples with the coating fabric to a vulcanization temperature of 160°C for 20 minutes under a pressure of 40 kgf. By employing samples (25 mm in width), the peel strength (TF) of the vulcanized rubber with respect to the lining fabric was measured in a normal environment (23°C) and a heated environment (120°C). C) in accordance with JIS K6256-1 standard.
    [055] It should be noted that the lining fabric used in this measurement comprised of a fabric braided from warp threads and threads twisted together with a twill in 2/2, being subjected to an RFL treatment (rate in RF/L weight = 1/5, NBR latex being employed as the latex). In the present case, the warp threads comprised of inelastic threads consisting of strands of 110-dtex nylon filaments. The warp threads consisted of elastic threads, formed from composite yarns where the intermediate yarns made from 220-dtex para-aramid fiber yarns (product name: Technora) came to be wrapped around the yarn cores formed from yarns. 470-dtex urethane elastics, and overcoated fabrics made of 110-dtex nylon fiber are additionally wrapped around the intermediate yarns. Observe that the warp threads extended along the longitudinal direction of the specimen, and the grain direction of the short fiber being identical to the longitudinal direction of the specimen. Peeling Resistance along the Cord (TF)
    [056] Each of the samples came to be obtained by aligning the cords along the longitudinal direction of a vulcanized rubber sheet made from the rubber composition of each of the Examples and Comparative Examples, positioning one supporting fabric in the cords, and integrating these materials with each other at 160°C for 20 minutes under a pressure of 40 kgf. By using samples (25 mm in width), the peel strength (TF) of the rubber next to the cord was measured under a normal environment (23°C) and a heated environment (120°C) according to the JIS K6256-1 standard. Note that aramid cords were used as the cords in Examples 11 to 13 and Comparative Examples 5 and 6, and glass cords were used as the cords in the remaining Examples and Comparative Examples. Belt Performance Assessment
    [057] According to Example 1 and Comparative Example 1, the toothed belts were prepared according to the first modality, and their performance was evaluated as described below. Specifically, the same lining fabric as used in the adhesion test described above was subjected to RFL treatment in the same way, with the preformation of a corrugated shape so that the warp threads extended along the direction. length of the belt. In addition, a tooth rubber formed from a rubber composition having the constitution given in Table 1 was pressure adhered to the lining fabric. Thereby, a lining fabric provided with rubber was obtained. Subsequently, the lining fabric provided with rubber, a glass cord, and a rubber bottom plate was wrapped around a notched mold in this order, and molded by vulcanization in a vulcanization chamber. In this way, a belt slab was obtained. The belt slab was cut to obtain RU-toothed belts having 92 teeth and a belt width of 19.1 mm. Note that the bottom rubber sheets used in Example 1 and Comparative Example 1 were formed from the same rubber composition, including HNBR as the rubber component, excluding any short fiber and any internal adhering agents in them. Resistance to Fabric Peeling
    [058] The toothed belt of Example 1 and Comparative Example 1 was cut into strip shape, obtaining a notch formed in the lining fabric. Then, the lining fabric was peeled from the tooth rubber along the longitudinal direction under a tension speed of 50 mm/minute, and the force required for peeling on top of a tooth was interpreted as the peeling resistance of the tooth. fabric. Table 1 presents the results. Durability Test under High Load
    [059] Each of the toothed belts of Example 1 and Comparative Example 1 were evaluated for durability under high load by means of a durability under high load test. Fig. 4 shows a transmission tester 90 used in the high load durability test. The transmission testing device 90 comprised of a transmission toothed pulley 91 having 18 teeth, a driven toothed pulley 92 having 36 teeth, a deflection pulley 93 having a pulley diameter of 55 mm, and a toothed deflection pulley 94 featuring 18 teeth.
    [060] In this test, the toothed belt 965 was wound around the transmission toothed pulley 91 and the driven toothed pulley 92, with the toothed belt 95 being rotated at 4000 rpm at an ambient temperature of 100C. On the loosened side of the belt, tension was applied to the belt from the outer part with the diverter pulley 93 and from the inner part with the diverter toothed pulley 94. In addition, while the toothed belt 95 remained rotating, a certain load was repeatedly applied to each tooth of the belt by means of the driven toothed pulley 92. In this test, the durability of the belt was evaluated by counting the number of repetitions of the load applied until the shear occurred. tooth removal in the runner. Fig. 5 presents the results.
    [061] First, comparisons were made between Example 1 and Comparative Example 1, between Example 2 and Comparative Example 2, and between Example 8 and Comparative Example 3 with reference to Table 1. These comparisons clearly show that not only resistance to peeling, but also the physical properties of rubber, such as resistance to tearing at high temperature, improved in each of the situations where internal adhesion agents (resorcinol and hexamethoxy methylolmelamine compound) ) were incorporated into the rubber composition. As may be evident from the comparison between Example 3 and Comparative Example 4, this trend was also observed not only in cases where HNBR came to be used as the rubber component, but also in cases where a mixture of HNBR and HXNBR was used as the rubber component. When the peeling resistance and physical properties of rubber, such as tear resistance, are improved in the manner described above, the durability of a belt used in an environment under high load and high temperature can be accentuated, as indicate the results of the high load durability test in Fig. 5.
    [062] Furthermore, from the comparison of Examples 1, 2, 8, and 9, it becomes evident that the physical properties especially with regard to the physical properties of high temperature rubber, such as fatigue stress together breakage and tear strength tended to improve when the amount of short fiber was greater than 10 parts by weight, while the peel strength tended to decrease slightly when the amount of short fiber became greater. greater than 10 parts by weight. In fact, it is more efficient to incorporate short fiber considering both the physical properties of the rubber and the resistance to peeling. It should be noted that presumably the decrease in peel strength with the increase in the amount of short fiber was caused by the consumption of large amounts of adhesion agents in the rubber in the vicinity of the fabric or cord by the reaction of the short fiber containing RFL.
    [063] Furthermore, as may be evident from a comparison of Examples 2 and 4 and 7, peel strength improved with increasing incorporated amounts of the internal tackifier; however, fatigue stresses at break (in particular, under the heated condition peaked at the incorporated amounts of Example 2 (resorcinol: 1.5 parts by weight and melamine compound: 0.9 parts). by weight), with the gradual decrease with increasing amounts of tackifiers. That said, the tear strength under heating condition was seen to peak along with the incorporated amounts of Example 5 (resorcinol: 3.0 parts by weight and melamine compound: 1.8 parts by weight), with the gradual decrease from increase by additional amounts. For this reason, as given by the Examples, it has become more efficient to incorporate the compound of melamine in an amount of around 0.9 to 1.8 parts by weight and resorcinol in an amount of around 1.5 to 3.0 parts by weight in the rubber composition, taking into account the physical properties of the rubber.
    [064] Furthermore, in the case of rubber compositions where short fiber was not incorporated, the addition of internal adhesion agents did not substantially improve the physical properties of the rubbers themselves, as evidenced by a comparison between the Comparative Example 5 and Example 11. The peel strength with respect to the cord was increased by the addition of the internal tackifiers. However, as in the case of fabric, peeling did not occur at the interface between fabric and rubber in any situation, but rubber breakage did occur without any difference being observed. For this reason, when these results were considered in combination with the results of the other Examples, it can be understood that better yields in terms of tear resistance and physical properties of rubber can be expected with the addition of adhesion agents internal. Furthermore, from a comparison between Examples 2 and 10 and Comparative Example 2, it can be understood that short fiber subjected to the RFL treatment more effectively improved the physical properties of the rubber.
    [065] Note that as may be evident from a comparison between Examples 12 and 12 and Comparative Example 6, when it came to incorporating the internal tackifiers in relatively large amounts in a situation where EPDM was used as the rubber component, fatigue stress at break, tear strength, and the like did not improve substantially, even though peel strength did improve.
    权利要求:
    Claims (10)
    [0001]
    1. Power transmission belt (10) CHARACTERIZED in that it comprises a rubber portion that is molded by vulcanizing a rubber composition including rubber, resorcinol and a melamine compound; wherein the rubber portion includes a hydrogenated acrylonitrile rubber; and wherein the power transmission belt (10) is a toothed belt containing tooth rubber (11), and the rubber portion constitutes at least a portion of the tooth rubber; wherein the parts incorporated by weight of the melamine compound are less than those of resorcinol.
    [0002]
    2. Power transmission belt, according to claim 1, CHARACTERIZED by the fact that the melamine compound is a compound of hexamethoxy methylol melamine.
    [0003]
    3. Power transmission belt according to claim 1 or 2, CHARACTERIZED by the fact that the rubber portion is adhered to a cord (14) or fabric (20), or the rubber portion carries an embedded short fiber in the same.
    [0004]
    4. Energy transmission belt, according to claim 3, CHARACTERIZED by the fact that at least one among the cord (14), the fabric (20) and the short fiber are subjected to treatment by RFL.
    [0005]
    5. Power transmission belt, according to any one of the preceding claims, CHARACTERIZED by the fact that a short aramid fiber having a fiber length of 0.5 to 10 mm is embedded within the portion of rubber.
    [0006]
    6. Energy transmission belt, according to any of the preceding claims, CHARACTERIZED by the fact that the rubber composition also includes silica.
    [0007]
    7. Power transmission belt, according to any of the preceding claims, CHARACTERIZED by the fact that the toothed belt (10) includes a cord (14), the tooth rubber (11) is disposed on a side of surface, and the timing belt further includes a bottom rubber (12) disposed on the other surface side, and a lining fabric (20) covering one surface side of the tooth rubber, the one surface side and the other side of surface being located across the cord from each other, and at least one side of the tooth rubber surface is formed by the rubber portion, and the lining fabric is adhered to the rubber portion.
    [0008]
    8. Power transmission belt, according to any one of the preceding claims, CHARACTERIZED by the fact that the amount of resorcinol is from 0.3 to 8 parts by weight in relation to 100 parts by weight of the matrix of the composition of rubber.
    [0009]
    9. Energy transmission belt, according to any one of the preceding claims, CHARACTERIZED by the fact that the amount of melamine compound is 0.2 to 5 parts by weight in relation to 100 parts by weight of the matrix of rubber composition.
    [0010]
    10. Method of manufacturing an energy transmission belt (10) CHARACTERIZED in that it comprises molding a portion of rubber constituting at least part of the energy transmission belt by means of vulcanizing a rubber composition including rubber, resorcinol and a melamine compound; wherein the rubber portion includes a hydrogenated acrylonitrile rubber; and wherein the power transmission belt (10) is a toothed belt containing tooth rubber (11), and the rubber portion constitutes at least a part of the tooth rubber; wherein the parts incorporated by weight of the melamine compound are less than those of resorcinol.
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    同族专利:
    公开号 | 公开日
    JP5885240B2|2016-03-15|
    MX2014006006A|2014-08-01|
    CN103403389B|2016-09-07|
    CA2856274C|2016-08-16|
    JP2013108564A|2013-06-06|
    ZA201403645B|2015-11-25|
    CA2856274A1|2013-05-30|
    RU2014125256A|2015-12-27|
    US9140329B2|2015-09-22|
    BR112014012264A2|2017-06-20|
    IL232602D0|2014-06-30|
    ES2695103T3|2019-01-02|
    KR20140093599A|2014-07-28|
    EP2784346A4|2015-09-09|
    EP2784346B1|2018-10-17|
    IL232602A|2016-12-29|
    EP2784346A1|2014-10-01|
    WO2013077004A1|2013-05-30|
    KR101927274B1|2018-12-10|
    US20140287862A1|2014-09-25|
    PL2784346T3|2019-03-29|
    CN103403389A|2013-11-20|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-07-30| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-05-12| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-04-13| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-15| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 01/02/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    2021-10-26| B25D| Requested change of name of applicant approved|Owner name: GATES CORPORATION (US) |
    2021-11-16| B25G| Requested change of headquarter approved|Owner name: GATES CORPORATION (US) |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011253958A|JP5885240B2|2011-11-21|2011-11-21|Transmission belt|
    JP2011-253958|2011-11-21|
    PCT/JP2012/052221|WO2013077004A1|2011-11-21|2012-02-01|Transmission belt|
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