JP2017082914A - belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress adhesion failure in a transmission or conveyance belt with no external sailcloth.SOLUTION: A belt B includes a belt body 1 in which tension members 2 are buried, and members 3 with a space thereinside at least one of which is buried into the belt body 1. The member 3 with a space is provided adjacently to one or both of the tension members 2 in a thickness direction of the belt body 1, and exposed at an end part in a width direction of the belt body 1.SELECTED DRAWING: Figure 1

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 Document 1 includes a three-dimensional stitch structure embedded in at least one side of a belt main body and a cord core wire embedded in the belt main body, and the cord core wire is in contact with the stitch structure. A belt is disclosed.

Japanese Patent Laid-Open No. 10-110787

  If a belt without an external canvas is manufactured by press vulcanization, poor adhesion of the laminated portion tends to occur.

  Then, the subject of this invention is suppressing the adhesion defect of a laminated part, when manufacturing the belt which does not have an external canvas by press vulcanization.

  The inventor of the present application paid attention to the following points regarding the cause of an increase in poor adhesion of the laminated portion when a belt without external canvas is manufactured by press vulcanization. That is, when the gas staying in the tensile material layer remains without being released during vulcanization, it expands and causes a poor adhesion of the laminated portion. Here, in the case of a belt provided with an external canvas, the tensile material and the canvas come into contact with each other, and the gas is released through the canvas as a route. Further, even when a belt without an external canvas is used for vulcanization using a mold (mold), gas can be released by using a tensile material generally wound in a spiral as a path. On the other hand, when a belt without an external canvas is produced by press vulcanization, there is no gas discharge path, and thus gas remains during vulcanization.

  Based on this, in order to solve the above problems, the belt of the present invention comprises 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 materials in the thickness direction of the belt main body, and is exposed at the end of the belt main body in the width direction.

  According to the present invention, since the member having the space serves as a path for releasing the gas from the tensile material, it is possible to suppress adhesion failure 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 view 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 for manufacturing an exemplary flat belt B of 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 of a comparative example of the present disclosure. FIG. 7 is a diagram showing a pulley layout in a test apparatus 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 of the present embodiment is a power transmission member that is used in applications such as a drive transmission application such as a blower, a compressor, and a generator, and an auxiliary machine drive application of an automobile. For example, the flat belt B has a belt length of 600 to 10,000 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 body 1 made of a rubber layer, a tensile material 2, and a gas path member 3 having a space inside. The tensile material 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 positioned near the center in the thickness direction. Further, a plurality of tensile materials 2 (seven in FIG. 1) are provided side by side in the width direction of the belt 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 in contact with the tensile material 2. Further, the gas path member 3 is exposed at the end of the belt body 1 in the width direction.

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

  FIG. 2 is a view showing a flat belt B according to an embodiment of the present invention with a part of the belt body 1 removed. In FIG. 2, a plurality of tensile materials 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 material 2 are shown. The gas path member 3 reaches both ends of the flat belt B in the width direction, and is exposed at the both ends.

  In FIG. 1 and FIG. 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 member 3 may be disposed so as to be adjacent to the tensile material 2 in the thickness direction of the belt body 1.

  The belt body 1 is formed in a band shape having a horizontally long cross section, and is cross-linked by a cross-linking agent by heating and pressing an unvulcanized rubber composition in which various compounding agents are blended with a rubber component. The rubber composition is formed.

  Examples of the rubber component of the rubber composition that forms the belt body 1 include ethylene-α-propylene copolymer (EPR), ethylene-propylene-diene terpolymer (EPDM), ethylene-octene copolymer, ethylene-α-ten copolymer, and the like. Examples include olefin elastomers; chloroprene rubber (CR); chlorosulfonated polyethylene rubber (CSM); hydrogenated acrylonitrile rubber (H-NBR). The rubber component is preferably one or more of these blend rubbers. The rubber composition contains such a rubber component and a rubber compounding agent described later.

  The tensile material 2 is composed of a twisted yarn formed of polyamide fiber, polyester fiber, aramid fiber or the like. Moreover, you may comprise the tensile material 2 with glass fiber, carbon fiber, etc. The diameter of the tensile material 2 is, for example, 0.5 to 2.5 mm, and the dimension between the centers of the adjacent tensile materials 2 in the cross section is, for example, 0.05 to 0.20 mm. The tensile material 2 is subjected to an adhesion treatment for imparting adhesion to the belt body 1. Specifically, an RFL adhesion treatment in which the resin is immersed in a resorcin / formalin / latex aqueous solution (hereinafter referred to as “RFL aqueous solution”) and heated, and a rubber glue adhesion treatment in which the resin is immersed in rubber glue and dried are sequentially applied.

  The gas path member 3 is a member having a space in the interior and serving as a path through which gas passes, and may be a twisted thread formed of, for example, polyamide fiber, polyester fiber, aramid fiber, or the like. Furthermore, it is desirable that these twisted yarns are used without being subjected to rubber treatment, and have a space inside more reliably. As an example, an industrial sewing thread may be used.

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

  If such a gas remains without being released in the press vulcanization process, it expands due to heat during vulcanization and causes poor adhesion of the belt layers. On the other hand, since the gas is released by the gas path member 3, the adhesion failure can be suppressed.

  As shown in FIG. 2, it is preferable that the gas path member 3 extends in the width direction of the belt body 1 because the path through which the gas is released is shortened. However, this is not essential and the belt body 1 may be inclined with respect to the width direction.

  Examples of the rubber compounding agent blended in the rubber composition constituting the belt body 1 include a reinforcing material, process oil, processing aid, vulcanization accelerating agent, cross-linking agent, vulcanization accelerating agent, and anti-aging agent. .

  As 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 is also mentioned as the reinforcing material. It is preferable that a reinforcing material is 1 type, or 2 or more types among these. It is preferable that content of a reinforcing material is 50-90 mass parts with respect to 100 mass parts of rubber components of a rubber composition.

  Oils include, for example, petroleum-based softeners, mineral oils such as paraffin wax, castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, palm oil, fall raw oil, wax, rosin, pine And vegetable oils such as oil. The oil is preferably one or more of these. The oil content 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. Among these, the processing aid is preferably one or more. The content of the processing aid is, for example, 0.5 to 2 parts by mass with respect to 100 parts by mass of the rubber component of the rubber composition.

  Examples of the vulcanization acceleration aid include metal oxides such as magnesium oxide and zinc oxide (zinc white), metal carbonates, fatty acids and derivatives thereof. Among these, the vulcanization acceleration aid is preferably one or more. Content of a vulcanization | cure acceleration | stimulation adjuvant is 3-7 mass parts with respect to 100 mass parts of rubber components of a rubber composition.

  Crosslinking agents include sulfur and organic peroxides. As a crosslinking agent, sulfur may be blended, an organic peroxide may be blended, or both of them may be used in combination. In the case of sulfur, 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 organic peroxide, the compounding amount is 100 parts by mass of the rubber component of the rubber composition. 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 thiuram (eg, TETD, TT, TRA, etc.), thiazole (eg, MBT, MBTS, etc.), sulfenamide (eg, CZ), dithiocarbamate (eg, BZ-P). Etc.). It is preferable that a vulcanization accelerator is 1 type, or 2 or more types among these. The content of the vulcanization accelerator is, for example, 1 to 3 parts by mass with respect to 100 parts by mass of the rubber component of the rubber composition.

  Examples of the anti-aging agent include benzimidazole anti-aging agents, amine-ketone anti-aging agents, diamine anti-aging agents, and phenol anti-aging agents. It is preferable that an anti-aging agent is 1 type, or 2 or more types among these. Content of anti-aging agent is 0.1-5 mass parts with respect to 100 mass parts of rubber components, for example.

(Manufacturing method of flat belt B)
A method of manufacturing the flat belt B according to this embodiment will be described with reference to FIG.
<Preparation of materials>
-Creation of unvulcanized rubber sheet for belt body 1-
While kneading the rubber component, various rubber compounding agents are blended and kneaded by a kneader such as a kneader or a Banbury mixer, and the resulting unvulcanized rubber composition is molded into a sheet by calendar molding or the like.

-Preparation of tensile material 2-
Adhesive treatment is applied to the tensile material 2. Specifically, the tensile material 2 is subjected to an RFL adhesion treatment in which it is immersed in an RFL aqueous solution and heated. Moreover, you may perform the foundation | substrate adhesion | attachment process which immerses in a foundation | substrate adhesion | attachment process liquid and heats before RFL adhesion | attachment processing. Furthermore, you may perform the rubber paste adhesion | attachment process which is immersed in rubber glue and dried before RFL adhesion | attachment processing.

-Preparation of gas path member 3-
For example, aramid fiber twisted yarn is prepared as the gas path member 3. The twisted yarn is used without being subjected to adhesion 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 materials 2 are arranged in parallel, a gas path member 3 is arranged, and the tensile material 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 material 2 and the unvulcanized rubber sheet so as to reach both ends in the width direction of the unvulcanized belt laminate 11. In addition, the gas path member 3 may be disposed on one side of the tensile material 2 in the thickness direction of the unvulcanized belt laminate 11 (in this case, the structure shown in FIG. 1) or both. (In this case, the structure shown in FIG. 2 is used).

  Moreover, the gas path member 3 is arrange | positioned so that it may protrude from the both ends of the width direction of the unvulcanized belt laminated body 11, and it is good also as a predetermined width | variety by cut | disconnecting both ends. In this way, the gas path member 3 can be reliably exposed at both end portions in the width direction and can be prevented from protruding from both end portions.

-Vulcanization-
FIG. 4 schematically shows a press vulcanizer 14 having upper and lower press machines 12 and 13 (upper press machine 12 and lower press machine 13). The unvulcanized belt laminate 11 is introduced between the press machines 12 and 13 (in FIG. 4, the unvulcanized belt laminate 11 is introduced from the left side with respect to the press machines 12 and 13). Next, the unvulcanized belt laminate 11 is pressed between the press panels 12 and 13, and vulcanization is performed by applying predetermined heat and pressure for a certain period of 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 in the interior, the space between the tensile material and the unvulcanized rubber sheet through the gas path member 3 from the inside of the unvulcanized belt laminate 11, particularly the layer of the tensile material 2. The gas staying in is released. Thereby, also when manufacturing the belt which does not have a canvas (reinforcement cloth) by press vulcanization, problems, such as poor adhesion which arise when gas remains in unvulcanized belt layered product 11, can be controlled. .

  Here, the length L1 of the press panels 12 and 13 (the dimension in the length direction of the unvulcanized belt laminate 11) is the interval L2 (the length of the unvulcanized belt laminate 11) where the gas path member 3 is arranged. (Interval in the vertical direction). Usually, since the length L1 of the press panels 12 and 13 is determined in advance, when the unvulcanized belt laminate 11 is formed, the arrangement interval L2 of the gas path member 3 may be set smaller than L1. When the plurality of gas path members 3 are arranged in the unvulcanized belt laminate 11 in the portion sandwiched between the press plates 12 and 13, the release of gas becomes more reliable. 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 material and the rubber sheet decreases, and the characteristics of the manufactured flat belt B are deteriorated. There is a possibility.

  From the above, the arrangement interval L2 of the gas path member 3 in the length direction of the flat belt B is preferably 500 mm or less, for example. L2 is preferably 5 mm or more. Further, the arrangement interval L2 is preferably not less than one fifth and not more than one half of L1, and more preferably about one third, based on the length L1 of the press board.

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

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

  In the above description, a flat belt has been described as an example. However, 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, ethylene propylene diene monomer (trade name: EP33, manufactured by JSR Corporation) is masticated, and HAF carbon black (trade name: Diamond Black, manufactured by Mitsubishi Chemical Corporation) with respect to 100 parts by mass of EPDM. 40 parts by mass of H), 5 parts by mass of process oil (trade name: Samper 2280, manufactured by Sun Oil Co., Ltd.), and 0.5 mass of stearic acid (trade name: manufactured by Shin Nippon Rika Co., Ltd., product name: stearic acid 50S) as a processing aid. 5 parts by weight of zinc oxide (trade name: 3 types of zinc oxide manufactured by Sakai Chemical Co., Ltd.) and benzimidazole anti-aging agent (trade name: Nocrack MB manufactured by Ouchi Shinsei Chemical Industry 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 are respectively added and kneaded. By continuing, an uncrosslinked rubber composition was produced.

  As the tensile material 2, a twisted yarn made of aramid fiber subjected to adhesion 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, 50th, and 78xtex 1 × 3 (3 cords). Moreover, the gas path member 3 is used without performing rubber treatment.

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

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

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

<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 for the use of the gas path member 3. Further, 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 (a portion indicated as the entire belt thickness) and a tensile material 2 embedded in the belt main body 1 are shown. In FIG. 5, the gas path member 3 does not appear 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 material 2. Such a space 4 is caused by gas remaining between the belt main body 1 and the tensile material 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 provided with the gas path member 3, no space is generated. This indicates that gas was released through the gas path member 3 during the vulcanization by the press board, and the generation of space was suppressed.

<Belt life test>
FIG. 7 shows the pulley layout of the test apparatus 20 for measuring the lifetime 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 the first pulley 21 and the second pulley 22 are to be tested. Wrap the belt to become. Further, at a position intermediate between the first pulley 21 and the second pulley 22, the meandering control pulley 23 having a diameter of 75 mm is pressed against the back side of the belt from above. As a result, 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 the reverse (180 ° rotation). ing. The display 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 driven by rotating the pulley at 260 rpm at a load of 49 N · m.

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

The lifetimes of the flat belt B of the example and the flat belt R2 of the comparative example (conventional flat belt by the mold manufacturing method) were both about 1.35 × 10 ^{6 in} terms of the number of bendings.

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

On the other hand, in the case of the flat belt R1 of the comparative example that does not have the gas path member 3, the number of times of bending is about 1.2 × 10 ^5, which is one digit or more smaller than the flat belt B of the embodiment. This is presumably because the gas was not released during vulcanization and a space was generated inside the belt, resulting in poor adhesion, resulting in a shortened life.

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

  The present invention is useful in the field of belts.

DESCRIPTION OF SYMBOLS 1 Belt main body 2 Tensile material 3 Gas path member 4 Space 11 Unvulcanized belt laminated body 11 'Vulcanized part 12 Press board 13 Press board 14 Press vulcanizer 20 Belt life test apparatus 20
21 First pulley 22 Second pulley 23 Meander control pulley

Claims (5)

A belt body in which a tensile material is embedded;
Comprising 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 materials in the thickness direction of the belt main body, and is exposed at an end in the width direction of the belt main body. To belt. In claim 1,
The member having the space is a twisted yarn.   The belt according to claim 2, wherein the twisted yarn is not rubber-treated. In any one of Claims 1-3,
The belt having the space is arranged with an interval of 5 mm or more and 500 mm or less in the longitudinal direction of the belt main body. In any one of Claims 1-4,
A belt characterized in that the belt body does not include an external canvas.