Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G5/00—V-belts, i.e. belts of tapered cross-section
  • F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
  • F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G5/00—V-belts, i.e. belts of tapered cross-section
  • F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed

Definitions

• the present invention relates to a wrapped V-belt in which the back sides of a plurality of wrapped V-belt parts are joined by a tie band.
• each wrapped V-belt section has a core layer including a core body;
• a wrapped joint comprising an elongated rubber layer laminated on the belt outer circumferential side of the core layer, a compressed rubber layer laminated on the belt inner circumference side of the core layer, and an outer cover fabric covering the entire outer surface of the belt.
• V-belts are known (for example, see Patent Document 1).
• the tie band is generally thin with an emphasis on flexibility, and as a result, the tie band may tear vertically due to falling into the pulley during running or malfunctioning when fitting with the pulley. There is a problem that this is likely to occur.
• the present invention has been made in view of these points, and its purpose is to improve the vertical tear durability of a tie band.
• the wrapped joint V-belt of the first invention includes a plurality of wrapped V-belt parts, and a tie band that connects the back sides of the plurality of wrapped V-belt parts,
• the tie band is 90° plain weave or 120° wide angle cotton canvas, chemical fiber blend canvas or sudare canvas;
• a rubber member having a thickness of 0.5 mm or more and 2.0 mm or less, which is laminated on the surface of the cotton canvas, chemical fiber blend canvas, or sudare canvas,
• the total thickness of the tie band is 14.9% or more and 22% or less of the total thickness of the wrapped V-belt.
• the total thickness of the tie band is less than 14.9% of the total thickness of the wrapped joint V-belt, vertical tearing will occur, and if it is greater than 22%, installation may be affected due to the layout. It may deteriorate or be damaged due to cracks in the tie band.
• the rigidity of the tie band allows the shape to be maintained, leading to improved durability.
• the tie band is made of an appropriately constructed cotton canvas, chemical fiber blend canvas, or sudare canvas and a rubber member, its effects are reliably exhibited.
• the thickness of the rubber member is 75% or more and 85% or less of the total thickness of the tie band.
• the thickness ratio of the rubber member is smaller than 75%, vertical tearing will occur, and if it is larger than 85%, the installation properties will deteriorate and cracks will easily occur in the tie band.
• Wrapped joint V-belt is The overall width is 34 mm or more and 130 mm or less, The overall thickness is 12 mm or more and 24 mm or less.
• the rubber member of the tie band is made of chloroprene rubber in which short fibers oriented in the belt width direction are at least one of cotton, PET, and aramid.
• the present invention by appropriately setting the structure and thickness of the tie band, it is possible to improve the vertical tear durability of the tie band.
• FIG. 2 is an enlarged cross-sectional view of a wrapped V-belt. It is a flowchart showing the flow of belt production. It is a figure which shows the belt structure pattern of a comparative example and an example.
• FIG. 7 is another diagram showing belt configuration patterns of comparative examples and examples.
• FIG. 2 is a diagram schematically showing a durability test device.
• FIG. 3 is a cross-sectional view showing an enlarged cross-section of a pulley. It is a figure which shows the result of the durability test of a comparative example and an example.
• FIG. 7 is another diagram showing the results of durability tests of comparative examples and examples.
• FIG. 3 is a diagram showing test conditions in a monitor test on the market.
• FIG. 3 is a diagram showing a layout image in a monitor test in the market. It is a figure which shows the result of the monitor test in the market of a comparative example and an example.
• FIG. 2 is another diagram showing the results of a monitor test on the market for Comparative Examples and Examples.
• FIG. 3 is a diagram showing the ratio of the thickness of the tie band to the thickness of the entire wrapped V-belt. It is a figure showing the ratio of the thickness of a rubber member to the thickness of the whole tie band. It is a figure explaining the principle of vertical tearing and separation of a tie band, (a) is a conventional thing, (b) is a thing of this embodiment.
• FIG. 1 is a cross-sectional view showing an exemplary wrapped V-belt 1 of the present embodiment.
• This wrapped joint V-belt 1 is suitable for use in, for example, piston pump crushers that are subject to pulsating loads, grinders that are subject to impact loads such as screens, crushers, hammer mills, reciprocating saws, chippers, etc., liquid stirrers that are used horizontally, and centrifugal separators. , mixers, etc.
• the dimensions of the wrapped V-belt 1 are not particularly limited, but for example, the belt circumference is 1500 to 8500 mm, the belt width is 34 mm to 130 mm, and the belt thickness is 12 mm to 24 mm.
• the wrapped combined V-belt 1 is made up of a plurality of wrapped V-belt sections 2 and tie bands 40 combined.
• the number of wrapped V-belt sections 2 coupled to one wrapped V-belt 1 is not particularly limited.
• the shape of the wrapped V-belt portion 2 is standardized as M-type, A-type, B-type, C-type, and D-type as a general-use V-belt (JIS K 6233:2008).
• the wrapped V-belt section 2 has a first adhesive rubber layer 12 and an elongated rubber layer 13 laminated on the upper part of the core wire 11, and a second adhesive rubber layer 14, a first compressed rubber layer 15, and a second adhesive rubber layer 14 on the lower part of the core wire 11.
• a compressed rubber layer 16 and a reinforcing layer 17 are laminated, and these laminated bands are covered with an outer covering canvas 18.
• the reinforcing layer 17 is, for example, a layered layer of multiple sheets of canvas.
• the core wire 11 is embedded between the first adhesive rubber layer 12 and the second adhesive rubber layer 14 so as to form a spiral having a pitch in the belt width direction.
• the rubber composition constituting the first compressed rubber layer 15 and the second compressed rubber layer 16 includes a polymer component, a reinforcing material such as carbon black, a crosslinking agent, a co-crosslinking agent, a vulcanization accelerator, and a vulcanization accelerator. Consists of sulfur accelerator, anti-aging agent, softener, etc.
• This polymer component consists of natural rubber (NR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), ethylene- ⁇ -olefin elastomer (EPDM), and the like.
• the polymer component may be composed of a single type, or may be composed of multiple types.
• At least one surface of the outer covering canvas 18 may be coated with the rubber composition described above.
• the first adhesive rubber layer 12, the elongated rubber layer 13, and the second adhesive rubber layer 14 are configured in the shape of a band with a horizontally long rectangular cross section, and are uncrosslinked rubber components that are kneaded with various compounding agents mixed into the polymer component. It is formed from a rubber composition that is crosslinked with a crosslinking agent by heating and pressurizing the rubber composition.
• the polymer components of the rubber compositions forming the first adhesive rubber layer 12, the elongated rubber layer 13, and the second adhesive rubber layer 14 are chloroprene rubber, chloroprene rubber, Examples include sulfonated polyethylene rubber (CSM), hydrogenated acrylonitrile rubber (H-NBR), and ethylene- ⁇ -olefin elastomer.
• the polymer component may be composed of a single type, or may be composed of multiple types.
• examples of compounding agents include reinforcing materials such as carbon black, vulcanization accelerators, crosslinking agents, anti-aging agents, softeners, and the like.
• the core wire 11 is made of twisted yarn such as polyester fiber (PET), polyethylene naphthalate fiber (PEN), aramid fiber, vinylon fiber, etc.
• PET polyester fiber
• PEN polyethylene naphthalate fiber
• aramid fiber vinylon fiber
• the core wire 11 is subjected to an adhesion treatment in which it is immersed in an RFL aqueous solution and then heated, and/or an adhesive treatment in which it is dipped in rubber glue and then dried, in order to impart adhesiveness to the belt body 10.
• the belt-forming fabric constituting the outer covering canvas 18 is made of, for example, a woven fabric, knitted fabric, non-woven fabric, etc. made of yarn such as cotton, polyamide fiber, polyester fiber, or aramid fiber.
• the belt forming cloth is subjected to an adhesive treatment of being immersed in an RFL aqueous solution and heated before forming, and/or coated with rubber glue on the surface that will be the belt body 10 side.
• An adhesion treatment may be performed by drying the adhesive.
• the rubber covering the belt-forming cloth may contain a friction coefficient reducing material.
• the friction coefficient reducing material include short fibers such as nylon staple fibers, vinylon staple fibers, aramid staple fibers, polyester staple fibers, and cotton staple fibers, and ultra-high molecular weight polyethylene resins.
• the tie band canvas constituting the tie band 40 may be, for example, a cotton canvas, a chemical fiber blend canvas, woven at a 90° plain weave or a 120° wide angle, with a thickness of 0.5 mm or more and 0.7 mm or less.
• a tie band rubber member having a thickness of 0.5 mm or more and 2.0 mm or less is laminated on the surface of the sagging canvas. Note that the thickness of the tie band canvas may be thinner than 0.5 mm or thicker than 2.0 mm depending on the case.
• the total thickness of the tie band 40 is 14.9% or more and 22% or less of the total thickness of the wrapped V-belt 1.
• the tie band canvas (not shown), such as cotton canvas, chemical fiber blend canvas, or sudare canvas, is composed of woven fabric, knitted fabric, nonwoven fabric, etc. made of yarns such as cotton, polyamide fiber, polyester fiber, and aramid fiber. There is.
• the tie band rubber member is made of chloroprene rubber, in which the short fibers oriented in the belt width direction are at least one of cotton, PET, and aramid.
• each material constituting the wrapped V-belt 1 described above is prepared. These can be obtained by processing the uncrosslinked rubber composition described in the above embodiment into a sheet shape using a calender roll or the like. Further, the twisted yarn for the core wire 11, the belt forming fabric (not shown) for the outer covering canvas 18, and the tie band canvas are subjected to adhesive treatment by impregnation and/or coating.
• a plurality of sheets of canvas that will become the reinforcing layer 17 are laminated on a mantle (not shown), and then a rubber sheet such as a chloroprene rubber composition for the second compressed rubber layer 16 is wrapped multiple times, A rubber sheet of the first compressed rubber layer 15 is wound thereon. Furthermore, a rubber sheet for the second adhesive rubber layer 14 is wound thereon. Furthermore, a core wire 11 such as a polyester cord coated with an adhesive is spirally wound thereon. Rubber sheets for the first adhesive rubber layer 12 and the elongated rubber layer 13 are wound thereon in order to produce a cylindrical laminated structure.
• the cylindrical laminated structure is sliced into a predetermined width on the mantle and then removed from the mantle.
• a skiving step S03 (not shown), the annular laminated structure is wound between a pair of pulleys with the thick side of the rubber layer facing outward, and both edges are cut diagonally while rotating to form a V-shape. Skiving is performed to form a chamfer. This adjusts the volume.
• the outer periphery of the annular laminated structure is wrapped with a belt-forming cloth that will become the outer covering canvas 18.
• a plurality of wrapped annular laminated structures are externally fitted into a cylindrical sheave having a V-groove (not shown), and a tie is placed on the outer surface of the plurality of laminated structures with adhesive rubber sandwiched between them. Tighten band 40.
• a vulcanization step S06 the tie-banded laminated structure is placed in a cylindrical sheave having a V-groove and vulcanized using a press. In this way, the wrapped V-belt 1 is manufactured.
• Comparative Example 1 has a tie band rubber with two layers of cotton canvas woven with cotton threads at a wide angle of 120 degrees and one layer of chloroprene rubber sheet with a thickness of 0.7 mm.
• a tie band 40 made of a material, an elongated rubber layer 13 made of a chloroprene rubber sheet containing staple fibers, a first adhesive rubber layer 12 made of a chloroprene rubber sheet, a core wire 11 made of aramid fiber, and a second adhesive rubber made of a chloroprene rubber sheet.
• Layer 14 a first compressed rubber layer 15 made of a chloroprene rubber sheet containing short fibers, a second compressed rubber layer 16 made of a chloroprene rubber sheet, a reinforcing layer 17 made of a wide-angle woven canvas of cotton threads and nylon threads, and a wide-angle woven canvas of cotton threads. It is composed of an outer covering canvas 18 made of canvas.
• Comparative Example 1 is equivalent to the conventional product. Comparative Examples 2 to 4 below were specially prepared for comparison.
• Comparative Example 2 differs from Comparative Example 1 in that the tie band 40 includes one layer of the same cotton canvas as Comparative Example 1 and two layers of tie band rubber members of a 0.7 mm thick chloroprene rubber sheet.
• Comparative Example 3 differs from Comparative Example 1 in that the tie band 40 includes one layer of the same cotton canvas as Comparative Example 1 and five layers of tie band rubber members of a 0.7 mm thick chloroprene rubber sheet.
• Comparative Example 4 differs from Comparative Example 1 in that the tie band 40 includes one layer of the same cotton canvas as Comparative Example 1 and six layers of tie band rubber members of a 0.7 mm thick chloroprene rubber sheet.
• Example 1 differs from Comparative Example 1 in that the tie band 40 includes three layers of tie band rubber members, including one layer of the same cotton canvas as Comparative Example 1 and a 0.7 mm thick chloroprene rubber sheet.
• Example 2 differs from Comparative Example 1 in that the tie band 40 includes one layer of the same cotton canvas as Comparative Example 1 and four layers of tie band rubber members of 0.7 mm thick chloroprene rubber sheet.
• the thickness increases to .2mm, 1.9mm, 2.6mm, 3.3mm, 4.0mm, and 4.7mm, and the ratio of the thickness of the rubber part to the total thickness of the tie band is 58.3% and 73% in the same order. .7%, 80.8%, 84.8%, 87.5%, and 89.4%.
• the total thickness of the wrapped joint V-belt 1 is in the order of Comparative Example 1, Comparative Example 2, Example 1, Example 2, Comparative Example 3, and Comparative Example 4.
• the thickness increases to 13.0mm, 13.7mm, 14.4mm, 15.1mm, 15.8mm, and 16.5mm, and the ratio of the belt total thickness to the tie band total thickness is 9.2% and 13% in the same order. .9%, 18.1%, 21.9%, 25.3%, and 28.5%.
• the total thickness of the wrapped joint V-belt 1 is as follows: They are 16.0 mm, 16.7 mm, 17.4 mm, 18.1 mm, 18.8 mm, and 19.5 mm in order, and the ratio of the belt total thickness to the tie band total thickness is 7.5% and 11 in the same order. .4%, 14.9%, 18.2%, 21.3%, and 24.1%.
• FIG. 6 shows an enlarged cross section of the B-type driving pulley DR and driven pool DN.
• the sample length of Comparative Examples 1 to 5 and Examples 1 and 2 was 3000 mm at a room temperature of 23 (-3 to +7)°C.
• the pitch between the wrapped V-belt parts 2, which is normally 19 mm, is increased to 19.6 mm to intentionally create a state of malfitting with the pulleys.
• a wrapped V-belt 1 consisting of four B-type V-belts with a length of 2692 mm joined together with tie bands was attached to the drive pulley DR' and driven pulley DN' of a combine harvester as an attachment machine.
• the driving pulley DR' has a pulley diameter of 400 mm
• the driven pulley DN' has a pulley diameter of 320 mm.
• the wheat was harvested using a combine hydraulic pump with a maximum horsepower of 267 PS. The required life is 400 hours or more.
• the total thickness of type B and type C is as high as 14.9% or more and 22% or less.
• the thickness of the rubber member is as high as 75% or more and 85% or less of the total thickness of the tie band 40 in the B type and C type, compared to the conventional comparative example 1. It is.
• a cushion rubber with low elasticity is installed between the canvas 40a and the wrapped V-belt section 2.
• the vertical tear durability of the tie band 40 can be improved.

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• 2023
  • 2023-08-24 WO PCT/JP2023/030452 patent/WO2024053410A1/ja unknown
  • 2023-08-24 JP JP2023552545A patent/JPWO2024053410A1/ja active Pending

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