JP6635753B2 - belt - Google Patents

Description

  The present invention relates to a belt.

  As a belt for transmission or conveyance, a belt in which a tensile material is embedded in a belt body is widely used. For example, Patent Literature 1 includes a three-dimensional knitted structure buried at least on one side of a belt body and a cord core embedded in the belt body, and the cord core is in contact with the knitted structure. A belt is disclosed.

JP-A-10-110787

  When a belt having no external canvas is manufactured by press vulcanization, poor adhesion of the laminated portion is likely to occur.

  Therefore, an object of the present invention is to suppress poor adhesion of a laminated portion when a belt having no external canvas is manufactured by press vulcanization.

  The inventor of the present application has paid attention to the following points regarding the cause of an increase in adhesion failure of a laminated portion when a belt having no external canvas is manufactured by press vulcanization. That is, if the gas remaining in the tensile material layer remains without being released during vulcanization, it expands and causes poor adhesion of the laminated portion. Here, in the case of the belt provided with the outer canvas, the tensile member and the canvas come into contact with each other, and the canvas is discharged as a path through the canvas. In addition, when vulcanization is performed using a mold even with a belt having no external canvas, gas can be released by using a tensile material generally wound around a spiral as a path. On the other hand, when a belt having no external canvas is manufactured by press vulcanization, there is no gas release path, so that gas remains during vulcanization.

  Based on this, in order to solve the above-described problems, the belt of the present invention includes a belt body in which a tensile material is embedded, and at least one member embedded in the belt body and having a space inside, The member having the space is provided adjacent to one or both of the tensile members in the thickness direction of the belt main body, and is exposed at an end in the width direction of the belt main body.

  According to the present invention, since a member having a space inside serves as a path for releasing gas from the tensile material, it is possible to suppress poor adhesion and the like caused by the gas remaining in the tensile material layer.

FIG. 1 is a diagram schematically illustrating an exemplary flat belt B of the present disclosure. FIG. 2 is a diagram showing a part of the flat belt B of FIG. FIG. 3 is a diagram schematically illustrating another exemplary flat belt of the present disclosure. FIG. 4 is a diagram illustrating a method of manufacturing an exemplary flat belt B according to the present disclosure. FIG. 5 is a photograph showing a cross section of the flat belt B according to the embodiment of the present disclosure. FIG. 6 is a photograph showing a cross section of a flat belt R1 according to a comparative example of the present disclosure. FIG. 7 is a diagram showing a pulley layout in a test device for measuring the life of a belt.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

  FIG. 1 schematically shows a flat belt B of the present embodiment. The flat belt B according to the present embodiment is a power transmission member that is used in, for example, a drive transmission application such as a blower, a compressor, or a generator, and an auxiliary device drive application of an automobile. The flat belt B has, for example, a belt length of 600 to 10000 mm, a belt width of 10 to 100 mm, and a belt thickness of 2 to 5 mm.

  The flat belt B of the present embodiment includes a belt main body 1 made of a rubber layer, a tensile member 2, and a gas path member 3 having a space inside. The tensile member 2 is embedded in the belt main body 1 so as to extend in the length direction of the belt main body 1 and to be located near the center in the thickness direction. Further, a plurality of tensile members 2 (seven in FIG. 1) are arranged in the width direction of the belt main body 1. The gas path member 3 is embedded in the belt body 1 so as to extend in the width direction of the belt body 1 and to be in contact with the tensile member 2. Further, the gas path member 3 is exposed at an end in the width direction of the belt main body 1.

  The flat belt B is a belt that does not include a canvas, a reinforcing cloth, or the like that covers the outer surface of the belt body 1.

  FIG. 2 is a diagram illustrating a flat belt B according to the embodiment of the present application with a part of the belt main body 1 removed. FIG. 2 shows a plurality of tensile members 2 extending in the length direction of the flat belt B and a gas path member 3 extending in the width direction of the flat belt B and adjacent to the tensile member 2. The gas path member 3 reaches both ends in the width direction of the flat belt B, and is exposed at both ends.

  In FIGS. 1 and 2, the gas path member 3 is disposed so as to be adjacent to only one of the tensile members 2 in the thickness direction of the belt body 1. However, as shown in FIG. 3, the gas path members 3 may be arranged so as to be adjacent to both the tensile members 2 in the thickness direction of the belt body 1.

  The belt main body 1 is formed in a belt shape having a horizontally-long rectangular cross section. The unvulcanized rubber composition obtained by mixing and kneading various compounding agents into the rubber component is heated and pressed to be crosslinked by the crosslinking agent. Formed of a rubber composition.

  The rubber component of the rubber composition forming the belt body 1 includes, for example, ethylene-α- such as ethylene-propylene copolymer (EPR), ethylene-propylene diene terpolymer (EPDM), ethylene-octene copolymer, and ethylene-butene copolymer. Olefin elastomer; chloroprene rubber (CR); chlorosulfonated polyethylene rubber (CSM); hydrogenated acrylonitrile rubber (H-NBR), and the like. The rubber component is preferably a blend rubber of one or more of these. The rubber composition contains such a rubber component and a rubber compounding agent described below.

  The tensile member 2 is composed of a twisted yarn formed of polyamide fiber, polyester fiber, aramid fiber, or the like. Further, the tensile member 2 may be made of glass fiber, carbon fiber, or the like. The diameter of the tensile member 2 is, for example, 0.5 to 2.5 mm, and the dimension between the centers of the adjacent tensile members 2 in the cross section is, for example, 0.05 to 0.20 mm. The tensile member 2 has been subjected to an adhesive treatment for imparting adhesiveness to the belt body 1. Specifically, an RFL bonding process of immersing in a resorcinol-formalin latex aqueous solution (hereinafter referred to as “RFL aqueous solution”) and heating, and a rubber glue bonding process of immersing in rubber glue and drying are sequentially performed.

  The gas path member 3 has a space inside and serves as a path through which gas passes. For example, the gas path member 3 may be a twisted yarn formed of polyamide fiber, polyester fiber, aramid fiber, or the like. Further, it is desirable that these twisted yarns are used without being subjected to a rubber treatment, so that a space is more reliably provided inside. As an example, an industrial sewing thread may be used.

  The gas path member 3 is provided so as to be in contact with the tensile member 2 and to reach and be exposed to the end in the width direction of the belt body 1. Thereby, in the manufacturing process of the flat belt B, in particular, the press vulcanization process, the gas can be discharged from the tensile member 2 to the outside of the belt main body 1 using the gas path member 3 as a discharge path.

  If such a gas remains without being released in the press vulcanization step, it expands due to heat at the time of vulcanization and causes poor adhesion of the belt layer. On the other hand, since the gas is released by the gas path member 3, the above-described adhesion failure can be suppressed.

  It is preferable that the gas path member 3 extends in the width direction of the belt main body 1 as shown in FIG. However, this is not essential, and may be oblique with respect to the width direction of the belt main body 1.

  Examples of the rubber compounding agent compounded in the rubber composition constituting the belt body 1 include a reinforcing material, a process oil, a processing aid, a vulcanization accelerator, a cross-linking agent, a vulcanization accelerator, an antioxidant, and the like. .

  Examples of the reinforcing material include carbon black, for example, channel black; furnace black such as SAF, ISAF, N-339, HAF, N-351, MAF, FEF, SRF, GPF, ECF, N-234; FT, MT, etc. Thermal black; acetylene black and the like. Silica may also be mentioned as a reinforcing material. The reinforcing material is preferably one or more of these. The content of the reinforcing material is preferably 50 to 90 parts by mass based on 100 parts by mass of the rubber component of the rubber composition.

  Examples of oils include petroleum softeners, mineral oils such as paraffin wax, castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, palm oil, falling raw oil, wood wax, rosin, pine And vegetable oils such as oils. The oil is preferably one or more of these. The content of the oil is, for example, 10 to 30 parts by mass with respect to 100 parts by mass of the rubber component of the rubber composition.

  Examples of the processing aid include stearic acid, polyethylene wax, and metal salts of fatty acids. The processing aid is preferably one or more of these. The content of the processing aid is, for example, 0.5 to 2 parts by mass based on 100 parts by mass of the rubber component of the rubber composition.

  Examples of the vulcanization accelerator include metal oxides such as magnesium oxide and zinc oxide (zinc white), metal carbonates, fatty acids and derivatives thereof. The vulcanization accelerator is preferably one or more of these. The content of the vulcanization accelerator is, for example, 3 to 7 parts by mass with respect to 100 parts by mass of the rubber component of the rubber composition.

  Crosslinking agents include sulfur and organic peroxides. As the crosslinking agent, sulfur may be blended, or an organic peroxide may be blended, or both of them may be used in combination. The compounding amount of the crosslinking agent is, for example, 1 to 5 parts by mass with respect to 100 parts by mass of the rubber component of the rubber composition in the case of sulfur, and 100 parts by mass of the rubber component in the case of an organic peroxide in the case of organic peroxide. For example, 1 to 5 parts by mass.

  Examples of the co-crosslinking agent include maleimide, TAIC, 1,2-polybutadiene, oximes, guanidine, trimethylolpropane trimethacrylate, and liquid rubber. The co-crosslinking agent is preferably one or more of these. The content of the co-crosslinking agent is, for example, 0.5 to 30 parts by mass with respect to 100 parts by mass of the rubber component.

  Examples of the vulcanization accelerator include, for example, thiurams (eg, TETD, TT, TRA, etc.), thiazoles (eg, MBT, MBTS, etc.), sulfenamides (eg, CZ, etc.), and dithiocarbamate salts (eg, BZ-P). And the like). The vulcanization accelerator is preferably one or more of these. The content of the vulcanization accelerator is, for example, 1 to 3 parts by mass based on 100 parts by mass of the rubber component of the rubber composition.

  Examples of the antioxidant include benzimidazole antioxidants, amine-ketone antioxidants, diamine antioxidants, and phenolic antioxidants. The antioxidant is preferably one or more of these. The content of the antioxidant is, for example, 0.1 to 5 parts by mass based on 100 parts by mass of the rubber component.

(Method of manufacturing flat belt B)
A method for manufacturing the flat belt B according to the present embodiment will be described with reference to FIG.
<Preparation of materials>
-Preparation of unvulcanized rubber sheet for belt body 1-
Various rubber compounding agents are compounded while kneading the rubber component, and are kneaded by a kneader such as a kneader or a Banbury mixer, and the obtained unvulcanized rubber composition is formed into a sheet by calendering or the like.

-Preparation of tensile material 2-
An adhesive treatment is applied to the tensile member 2. Specifically, the tensile material 2 is subjected to an RFL bonding treatment in which the tensile material 2 is immersed in an RFL aqueous solution and heated. Before the RFL bonding process, a base bonding process of immersing in a base bonding solution and heating may be performed. Further, before the RFL bonding process, a rubber glue bonding process of dipping in rubber glue and drying may be performed.

-Preparation of gas path member 3-
As the gas path member 3, for example, a twisted yarn of aramid fiber is prepared. The twisted yarn is used without being subjected to an adhesive treatment (rubber treatment, RFL treatment, etc.).
<Molding process>
-Preparation of unvulcanized belt laminate-
An unvulcanized belt having a structure in which a predetermined number of tensile members 2 are arranged in parallel, a gas path member 3 is arranged, and the tensile member 2 and the gas path member 3 are sandwiched between unvulcanized rubber sheets from both sides. The laminated body 11 is created. The gas path member 3 is disposed between the tensile member 2 and the unvulcanized rubber sheet so as to reach both ends in the width direction of the unvulcanized belt laminate 11. Further, the gas path member 3 may be disposed on one of the tensile members 2 in the thickness direction of the unvulcanized belt laminate 11 (in this case, the structure shown in FIG. 1) or disposed on both sides. (In this case, the structure is as shown in FIG. 2).

  Further, the gas path member 3 may be disposed so as to protrude from both ends in the width direction of the unvulcanized belt laminate 11, and both ends may be cut to have a predetermined width. In this way, the gas path member 3 can be reliably exposed at both ends in the width direction, and can be prevented from protruding from both ends.

-Vulcanization-
FIG. 4 schematically shows a press vulcanizer 14 having upper and lower press plates 12 and 13 (upper press plate 12 and lower press plate 13). The unvulcanized belt laminate 11 is introduced between the press plates 12 and 13 (in FIG. 4, the unvulcanized belt laminate 11 is introduced from the left side with respect to the press plates 12 and 13). Next, the unvulcanized belt laminate 11 is pressed between the press plates 12 and 13, and vulcanization is performed by applying a predetermined heat and pressure for a predetermined time. For example, a pressure of ²⁰ to 80 kg / cm ² is applied at a temperature of 150 to 200 ° C. for 5 to 15 minutes. Thereby, the unvulcanized belt laminate 11 is partially vulcanized.

  At this time, since the gas path member 3 has a space therein, the space between the tensile material and the unvulcanized rubber sheet is passed through the gas path member 3 from the inside of the unvulcanized belt laminate 11, particularly from the layer of the tensile material 2. The gas that has stayed is released. Accordingly, even when a belt having no canvas (reinforcement cloth) is manufactured by press vulcanization, problems such as poor adhesion that occur when gas remains in the unvulcanized belt laminate 11 can be suppressed. .

  Here, the length L1 (the dimension in the length direction of the unvulcanized belt laminate 11) of the press plates 12 and 13 is equal to the distance L2 (the length of the unvulcanized belt laminate 11) where the gas path members 3 are arranged. (Interval in the vertical direction). Usually, since the lengths L1 of the press plates 12 and 13 are determined in advance, when forming the unvulcanized belt laminate 11, the arrangement interval L2 of the gas path members 3 may be set to be smaller than L1. When a plurality of gas path members 3 are arranged in the unvulcanized belt laminate 11 at a portion sandwiched between the press plates 12 and 13, the gas is more reliably released. From this point, it is desirable that the arrangement interval L2 is relatively small. However, if L2 is too small, the cost of the gas path member 3 increases, and due to the presence of the gas path member 3, the adhesive force between the tensile member and the rubber sheet decreases, and the characteristics of the flat belt B to be manufactured deteriorate. There is a possibility.

  As described above, the arrangement interval L2 of the gas path members 3 in the length direction of the flat belt B is preferably, for example, 500 mm or less. L2 is preferably 5 mm or more. Further, the arrangement interval L2 is preferably not less than 1/5 and not more than 1/2 of L1, and more preferably about 1/3, based on the length L1 of the press board.

  When one vulcanization step is completed, the press plates 12 and 13 are opened, and the vulcanized portion 11 'is taken out on the opposite side (to the right in FIG. 4) from the previous introduction direction. At the same time, the unvulcanized belt laminate 11 following the vulcanized portion 11 'is introduced between the press plates 12 and 13, and the portion is vulcanized. The flat belt B is manufactured by repeating such a process.

  Here, the description has been made assuming that the unvulcanized belt laminate 11 is prepared in advance and vulcanized by the press vulcanizer 14. However, for example, after the tensile member 2 and the gas path member 3 are sandwiched between unvulcanized rubber sheets to form a laminated structure, they may be continuously introduced into the press vulcanizer 14 and vulcanized.

  In the above, the flat belt has been described as an example, but the technology of the present disclosure can be applied to other types of belts such as a V belt and a V-ribbed belt.

  An uncrosslinked rubber composition constituting the belt body 1 was prepared. Specifically, an ethylene propylene diene monomer (trade name: EP33, manufactured by JSR Corporation; hereinafter, referred to as “EPDM”) is masticated, and HAF carbon black (trade name: diamond black, manufactured by Mitsubishi Chemical Corporation) is added to 100 parts by mass of EPDM. H), 40 parts by mass, 5 parts by mass of process oil (trade name: Sanpar 2280, manufactured by Sun Oil Co.), and 0.5 parts by mass of stearic acid (trade name: 50S, manufactured by Shin Nippon Rika Co., Ltd.) as a processing aid. Part, 5 parts by mass of zinc oxide (trade name: 3 kinds of zinc oxide, manufactured by Sakai Chemical Co., Ltd.) as a vulcanization accelerator, and benzimidazole antioxidant (trade name: Nocrack MB, manufactured by Ouchi Shinko Chemical Co., Ltd.) 2 parts by mass and 6 parts by mass of an organic peroxide (trade name: Peroximon F-40, purity: 40% by mass, manufactured by NOF CORPORATION) as a cross-linking agent were added and kneaded. By continuing, an uncrosslinked rubber composition was produced.

  Further, as the tensile material 2, a twisted yarn made of an aramid fiber subjected to an adhesive treatment was prepared.

  Further, an industrial sewing thread was prepared as the gas path member 3. The industrial sewing thread is made of 66 nylon, has a count of 50, and has a structure of 78 dtex and 1 × 3 (three cords). Further, the gas path member 3 is used without performing rubber treatment.

  Using the uncrosslinked rubber composition, the tensile member 2 and the gas path member 3 as described above, a flat belt was prepared as described above.

  Here, the arrangement interval L2 of the gas path members 3 was 300 mm in the length direction of the flat belt. The length of the press plate in the used press vulcanizer is 1000 mm. Therefore, about three gas path members 3 are arranged in the unvulcanized belt laminate at a portion that is sandwiched between the press plates and vulcanized at one time.

As vulcanization conditions, a pressure of 70 kg / cm ² was applied at a temperature of 170 ° C. for 9 minutes.

<Comparative example>
A flat belt R1 of a comparative example was manufactured in the same manner as the flat belt of the above-described example except that the gas path member 3 was not used. In addition, a flat belt prepared by a mold manufacturing method was prepared and used as a flat belt R2 of a comparative example.

(Evaluation)
<Section observation>
5 and 6 show cross-sectional photographs of the flat belt B of the example and the flat belt R1 of the comparative example. 5 and 6, a belt main body 1 (portion indicated as the entire belt thickness) and a tensile member 2 embedded therein are shown. In FIG. 5, the gas path member 3 is not shown in the cross section.

  As shown in FIG. 6, in the case of the flat belt R <b> 1 without the gas path member 3, it can be seen that the space 4 is generated around the tensile member 2 and the like. Such a space 4 is generated due to a gas remaining between the belt body 1 and the tensile member 2 during vulcanization by a press machine. On the other hand, as shown in FIG. 5, in the case of the flat belt B of the embodiment including the gas path member 3, no space is generated. This indicates that the gas was released through the gas path member 3 during vulcanization by the press machine, and the generation of a space was suppressed.

<Belt life test>
FIG. 7 shows a pulley layout of the test apparatus 20 for measuring the life time of the belt. The test apparatus 20 includes a first pulley 21 having a diameter of 100 mm, and a second pulley 22 having a diameter of 100 mm arranged at a predetermined distance in the horizontal direction. And wrap the belt. At a position intermediate between the first pulley 21 and the second pulley 22, a meandering control pulley 23 having a diameter of 75 mm is pressed against the back side of the belt from above. Thereby, meandering when the belt travels is suppressed, and in both the first pulley 21 and the second pulley 22, the belt changes the traveling direction by 10 ° more than reversing (180 ° rotation). ing. The indication of 190 ° in FIG. 7 indicates this.

  Further, a dead weight of 3040 N is applied to the first pulley 21, and the belt is run by rotating the pulley at 260 rpm under a load of 49 N · m.

  A running test of the belt was performed under such conditions, and the life time of the belt was measured.

The life of each of the flat belt B of the example and the flat belt R2 of the comparative example (conventional flat belt by a molding method) was about 1.35 × 10 ^{6 in} terms of the number of times of bending.

  That is, the flat belt B of the embodiment obtained by press vulcanization has a service life similar to that of the flat belt R2 obtained by the mold manufacturing method.

On the other hand, in the case of the flat belt R1 of the comparative example having no gas path member 3, the number of times of bending is about 1.2 × 10 ^5, which is smaller by one digit or more than the flat belt B of the embodiment. This is considered to be due to the fact that gas was not released during vulcanization, a space was generated inside the belt, and adhesion failure occurred, so that the life was shortened.

  As described above, the flat belt of this embodiment including the gas path member (for example, the industrial sewing thread) serving as a path through which the gas is released from the tensile material during press vulcanization can be manufactured while suppressing poor adhesion. it can.

  The invention is useful in the field of belts.

REFERENCE SIGNS LIST 1 belt main body 2 tensile member 3 gas path member 4 space 11 unvulcanized belt laminate 11 ′ vulcanized portion 12 press plate 13 press plate 14 press vulcanizer 20 belt life test device 20
21 first pulley 22 second pulley 23 meandering control pulley

Claims (5)

A belt body with embedded tensile material,
A member having at least one embedded in the belt body and having a space inside,
The member having the space is provided on one or both of the tensile members in the thickness direction of the belt main body so as to be in contact with the tensile member , and is exposed at a widthwise end of the belt main body. Belt. In claim 1,
The member having the space is a twisted yarn.   3. The belt according to claim 2, wherein the twisted yarn is not subjected to rubber treatment. In any one of claims 1 to 3,
A belt, wherein the members having the space are arranged at intervals of 5 mm or more and 500 mm or less in a longitudinal direction of the belt main body. In any one of claims 1 to 4,
A belt, wherein the belt body does not include an external canvas.