JP4513585B2 - Manufacturing method of reinforcing hose - Google Patents

Description

  The present invention relates to a method for manufacturing a reinforcing hose that is used in a flow path of a pressure fluid such as a hydraulic hose and has a reinforcing yarn layer braided.

  Conventionally, as this type of brake hose, for example, those shown in FIG. 10 (Patent Documents 1 and 2) are known. FIG. 10 is a sectional view showing the brake hose. The brake hose 100 is configured by laminating an inner tube layer 102, a lower thread layer 104, an intermediate rubber layer 106, an upper thread layer 108, and an outer rubber layer 110 in order from the flow path for flowing a working fluid toward the outside. Has been. In order to manufacture this brake hose, first, the inner pipe layer 102 is formed by extruding a rubber material of ethylene propylene diene terpolymer in an annular shape, and then the lower thread 15 is braided by a braiding device. Thus, the lower thread layer 104 is formed. Thereafter, the upper thread layer 108 is formed by winding a sheet-like rubber material on the lower thread layer 104 and braiding the upper thread. Subsequently, the outer thread rubber layer 110 is laminated by extruding the rubber material onto the upper thread layer 108 after applying a dip treatment for applying an emulsion adhesive on the upper thread layer 108 and drying the adhesive layer. . The brake hose 100 is completed by vulcanization and predetermined post-processing. In the brake hose 100, two layers of the lower thread layer 104 and the upper thread layer 108 are embedded in the rubber substrate in order to increase pressure resistance. In addition, by applying an adhesive layer on the upper thread layer 108, the bonding strength between the upper thread layer 108 and the outer rubber layer 110 is increased, and the pressure resistance is increased.

  However, the conventional brake hose has a problem that the locus when assembled in the vehicle varies from product to product, or even when assembled in the vehicle, the locus changes with use and easily interferes with other parts.

JP 2000-46255 A JP 2003-161388 A

  The present invention solves the above-described problems of the conventional technology, and an object of the present invention is to provide a brake hose capable of making the bending rigidity uniform.

The present invention made to solve the above problems
Forming a reinforcing layer braided with a reinforcing yarn on a rubber substrate;
Forming an adhesive layer on the reinforcing layer;
Forming an outer rubber layer on the reinforcing layer formed with the adhesive layer;
Vulcanizing after forming the outer rubber layer;
A method for manufacturing a reinforcing hose comprising:
A step of unraveling to homogenize the bending rigidity by compressing the vulcanized reinforcing hose.
The loosening process
A plurality of rollers arranged along a conveying path of the reinforcing hose, a belt which is spanned by the rollers and arranged at an interval narrower than an outer diameter D0 of the reinforcing hose, and conveys the reinforcing hose by driving the rollers; Using a loosening device with
When the outer diameter when the reinforcing hose is compressed to be flat is D1, and (D0−D1) × 100 / D0 is the compression ratio, the gap of the belt is set so that the compression ratio is 5 to 20%. It is characterized by passing through .
Moreover, as another aspect, a step of forming a reinforcing layer braided with a reinforcing yarn on a rubber substrate,
Forming an adhesive layer on the reinforcing layer;
Forming an outer rubber layer on the reinforcing layer formed with the adhesive layer;
Vulcanizing after forming the outer rubber layer;
A method for manufacturing a reinforcing hose comprising:
Comprising a step of unraveling to homogenize bending rigidity by compressing the reinforced hose after vulcanization,
The loosening process
Using a loosening device having rollers arranged above and below the conveyance path along the conveyance path of the reinforcement hose and rollers arranged on the left and right of the conveyance path, the reinforcement hose is interposed between the upper and lower and left and right rollers. The reinforcing hose is compressed from two directions by passing through .

  The reinforcing hose according to the present invention has a reinforcing layer formed by braiding reinforcing yarn on a rubber base, and the reinforcing layer is covered with an outer rubber layer. The reinforcing layer and the outer rubber layer are bonded by an adhesive layer. The reinforcing hose is subjected to a loosening process for making the bending rigidity uniform after vulcanization. The loosening treatment maintains the adhesion between the reinforcing layer and the outer rubber layer, but cuts the adhesion between the reinforcing yarns of the reinforcing layer. Thereby, the bending hose of the reinforcing hose is within a predetermined range, and variation between products is suppressed. Moreover, even if a force for bending the reinforcement hose to other parts is applied, variation in the locus can be suppressed.

  As a preferred aspect of the present invention, the unraveling process can be performed by a roller that is arranged along a predetermined path and that compresses the reinforcing hose. Further, in the loosening treatment, the outer diameter of the strong hose is D0, the outer diameter when the reinforcing hose is compressed to be flat is D1, and the compression ratio is (D0−D1) × 100 / D0. The rate can be set to 5-20%. Here, the adhesive layer can be formed using an RFL adhesive solution.

  Moreover, the reinforcement hose should just have a reinforcement layer for withstanding the pressure | voltage resistance of a pressure fluid, for example, can be applied to a brake hose. In this aspect, the rubber substrate forms a flow path for flowing a pressure fluid, forms an inner tube layer from the rubber material, forms a lower yarn layer by braiding the lower yarn on the inner tube layer, and forms the lower yarn layer. It can be configured by forming an intermediate rubber layer from a rubber material laminated on the yarn layer.

  In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment applied to a brake hose of an automobile of a reinforcing hose will be described.

  FIG. 1 is a perspective view in which the brake hose 10 is partially broken, and FIG. 2 is a sectional view of the brake hose 10. 1 and 2, a brake hose 10 is a hose used for supplying brake pressure fluid between a master cylinder and a brake cylinder of an automobile, and includes an inner tube layer 12 that forms a flow path 11, and an inner tube layer 12. The lower thread layer 14 braided on the tube layer 12, the intermediate rubber layer 16 coated on the surface of the lower thread layer 14, the upper thread layer 18 braided on the surface of the intermediate rubber layer 16, and the upper thread layer 18 The outer rubber layer 20 is coated on the surface, and a base 22 is fastened to the end by caulking.

The inner tube layer 12 is a rubber tube formed from ethylene propylene diene terpolymer (EPDM), styrene butadiene rubber (SBR), or the like, and has a flow path 11 formed inside thereof, and has an inner diameter. Is 3.0 to 3.4 mm, and the thickness is 0.5 to 1.0 mm.
The lower thread layer 14 is formed by braiding the lower thread 15. The lower thread 15 is made of polyester, vinylon, and rayon, and is formed by bundling 200 to 400 filament threads.
The intermediate rubber layer 16 is made of EPDM, natural rubber (NR) or the like and has a thickness of 0.1 to 0.3 mm.
The upper thread layer 18 is formed by braiding the upper thread 19. The upper yarn 19 is made of polyester, vinylon, and rayon and is formed by bundling 200 to 400 filament yarns.
The outer rubber layer 20 is made of EPDM, chloroprene rubber (CR) or the like and has a thickness of 0.5 to 1.3 mm.
The upper thread layer 18 and the outer rubber layer 20 are firmly bonded to each other by being subjected to an adhesive treatment using an RFL adhesive liquid. The RFL adhesive liquid is a liquid obtained by mixing an aqueous solution of an initial condensate of resorcin / formaldehyde and a rubber latex. The aqueous solution of the above initial condensate can be prepared by reacting 0.8 to 0.75 mol of formaldehyde with 1 mol of resorcin at a temperature near room temperature in a basic catalyst. As the basic catalyst, basic substances such as sodium hydroxide and ammonium hydroxide are preferably used. Natural rubber latex and synthetic rubber latex can be used as the rubber latex, and as the synthetic rubber latex, for example, styrene / butadiene copolymer rubber latex, vinylpyridine / butadiene / styrene copolymer rubber latex, or the like can be used. .

  Next, a series of manufacturing steps of the brake hose 10 will be described. 3 to 7 are explanatory views showing the manufacturing process of the brake hose 10. In FIG. 3A, an inner tube extrudate 12A for forming the inner tube layer 12 is formed by extruding EPDM rubber by the first extruding device 31, cooled by the cooling device 32, and further, a predetermined length by the cutter 33. Then, the mandrel Md is inserted. Subsequently, as shown in FIG. 3B, the lower yarn 15 is braided on the inner tube extrudate 12A by the first braiding device 34 on the extruded inner tube extrudate 12A. Layer 14 is formed. Further, an intermediate rubber layer 16 is formed so as to cover the lower thread layer 14. The intermediate rubber layer 16 is formed by winding the sheet rubber material 16 </ b> A fed from the roller 35 around the lower thread layer 14. Further, the upper yarn layer 18 is formed on the intermediate rubber layer 16 by braiding the upper yarn 19 with the second braiding device 36.

  Subsequently, as shown in FIG. 4, the extruded tube body 18 </ b> A braided with the upper thread layer 18 is immersed in the RFL adhesive liquid in the adhesive tank 37. As described above, the RFL adhesive liquid is a liquid in which an aqueous solution of an initial condensate of resorcin / formaldehyde and a rubber latex are mixed. Thereafter, the RFL adhesive liquid is dried by drying the extruded tube body 18 </ b> A at 90 to 200 ° C. with the drying device 38. Subsequently, the outer rubber layer 20 is formed by extruding the EPDM rubber onto the upper thread layer 18 by the second extrusion device 39.

  Thereafter, the vulcanization process is performed under normal conditions. For example, the vulcanization conditions are about 145 to 165 ° C. × about 15 to 60 minutes. By this vulcanization step, the inner tube layer 12, the intermediate rubber layer 16, and the outer rubber layer 20 are joined by ordinary vulcanization adhesion. At the same time, the upper thread 19 of the upper thread layer 18 adheres to the outer rubber layer 20 with heat during vulcanization via the RFL adhesive liquid. Thereafter, the mandrel Md (see FIG. 3) is pulled out. Thereby, the reinforcing hose 10A is obtained.

  Subsequently, a loosening process is performed. FIG. 5 is an explanatory diagram for explaining the loosening process. The loosening process is performed using the loosening device 40. The unraveling device 40 spans the first roller group 41, the second roller group 42 disposed on the first roller group 41, the first roller group 41 and the second roller group 42, and has a thickness of 6 mm. Rubber belts 43a and 43b. The first roller group 41 includes a large-diameter roller 41a on both sides and a small-diameter roller 41b therebetween. Similarly to the first roller group 41, the second roller group 42 includes a large-diameter roller 42a and a small-diameter roller 42b. The distance L1 between the belts 43a and 43b is set smaller than the outer diameter D0 of the reinforcing hose 10A. Accordingly, the reinforcing hose 10A is compressed when it passes between the first roller group 41 and the second roller group 42. For example, when the gap L1 is 8 mm and the outer diameter D0 is 10 mm, the compression hose 10A has a compression rate of 20%.

In order to perform the unraveling process using the unraveling device 40, a plurality of reinforcing hoses 10A are passed through the gaps between the first roller group 41 and the second roller group 42, and the belts 43a, 43a, 42a are driven by the large-diameter rollers 41a, 42a. The reinforcing hose 10A is sent while conveying 43b. The reinforcing hose 10A is compressed by passing through a gap L1 between the belts 43a and 43b that is narrower than the outer diameter D0. By this loosening treatment, the adhesion between the upper thread 19 and the upper thread 19 can be cut while maintaining the adhesion between the upper thread 19 and the outer rubber layer 20. That is, the adhesive strength of the upper thread 19 and the outer rubber layer 20 by the RFL adhesive liquid is large, and the adhesion is not lost even if a loosening process is performed, but the upper thread 19 is weak in adhesive strength. The adhesion is lost.
Then, after cutting the reinforcing hose 10A into a predetermined length, the brake hose 10 is obtained by attaching the base 22.

Next, a bending rigidity test of the reinforcing hose 10A will be described. FIG. 6 is an explanatory diagram for explaining the bending rigidity test. The bending rigidity test was performed by supporting the reinforcing hose 10A at intervals of 200 mm in the longitudinal direction, applying a load to the center of the supporting portion, and measuring the load when the reinforcing hose 10A was bent 10 mm. 7 and 8 show the bending rigidity of each part in the length direction of the reinforcing hose 10A, FIG. 7 shows a conventional reinforcing hose 10A (sample 1 to sample 3), and FIG. 8 shows the unwinding process according to this embodiment. The reinforcement hose 10A (samples 4 and 5) which gave is shown. Here, in each sample, the rubber material is EPDM, the outer diameter of the reinforcing hose is 10.5 mm, the length is 3500 mm, the inner diameter of the inner tube layer is 3.2 mm, and the thickness of the inner tube layer is 0.2 mm. 8 mm, the thickness of the intermediate rubber layer was 0.2 mm, and the thickness of the outer rubber layer was 0.8 mm. Moreover, polyester (PET) fiber was used for the lower thread and the upper thread. Samples 1 to 3 of the conventional example and samples 4 and 5 of the example were subjected to a treatment (dip treatment) on the upper thread layer 18 soaking in an RFL adhesive solution.
In the conventional samples 1 to 3 in FIG. 7, the bending rigidity varies at 130 to 340 N · cm ² in the lengthwise direction of the hose. On the other hand, Samples 4 and 5 in FIG. 8 are stable in a range of 120 to 130 N · cm ² and suppress variation. Here, the compression rate is preferably 5% or more, particularly preferably 15% or more, and if it exceeds 30%, the effect does not increase.

The reinforcing hose according to the above embodiment can obtain the following actions and effects by performing a loosening treatment. When the upper thread layer 18 is braided and then immersed in the RFL adhesive liquid, the RFL adhesive liquid is an emulsion liquid, so that it penetrates into the upper thread layer 18 and bonds the upper threads 19 together. Adhesion between the upper threads 19 is separated by performing a loosening process by compression. The unraveling process cuts the bond between the upper threads to the brake hose 10, so that the bending rigidity can be prevented from varying from product to product, and even when assembled on a vehicle, the variation in the trajectory can be suppressed. There is no interference. In addition, since the adhesion between the upper thread layer 18 and the outer rubber layer 20 is maintained by such a loosening process, the characteristics of the brake hose 10 are not affected.
Further, since the long reinforcing hose before cutting is subjected to a loosening process, the productivity is higher than that performed individually.

  FIG. 9 is an explanatory diagram for explaining a loosening device 40C according to another embodiment. The unraveling process according to the present embodiment has a feature in a process of compressing from two directions of up and down and left and right. The loosening device 40C includes a first roller group 41C on the top and bottom and a second roller group 42C on the left and right with respect to the feeding direction of the reinforcing hose 10A. A surface for compressing the reinforcing hose 10A of each of the first and second roller groups 41C and 42C is formed as a concave curved surface. In this way, by compressing the reinforcing hose 10A from two directions, the bending rigidity can be made even more uniform, and variations between products can be suppressed.

  The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the invention.

It is the perspective view which fractured | ruptured the brake hose partially. It is sectional drawing of a brake hose. It is explanatory drawing explaining the manufacturing process concerning one Example of a brake hose. It is explanatory drawing explaining the manufacturing process following FIG. It is explanatory drawing explaining the loosening apparatus which performs a loosening process. It is explanatory drawing explaining a bending rigidity test. It is a graph which shows the bending rigidity in each site | part of the length direction of a reinforcement hose. It is a graph which shows the bending rigidity in each site | part of the length direction of a reinforcement hose. It is explanatory drawing explaining the unraveling process concerning another Example. It is sectional drawing which shows the conventional brake hose.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Brake hose 10A ... Reinforcement hose 11 ... Flow path 12 ... Inner pipe layer 12A ... Inner pipe extrudate 14 ... Lower thread layer 15 ... Lower thread 16 ... Intermediate rubber layer 16A ... Sheet rubber material 18 ... Upper thread layer 18A ... Extruded tube 19 ... Upper thread 20 ... Outer rubber layer 22 ... Base 31 ... First extruder 32 ... Cooling device 33 ... Cutter 34 ... First braiding device 35 ... Roller 36 ... Second braiding device 37 ... Adhesion tank 38 ... Drying device 39 ... Second extrusion device 40 ... Unraveling device 40C ... Unraveling device 41, 42 ... First and second roller groups 41C, 42C ... First and second roller groups 41a, 42a ... Large diameter Roller 41b, 42b ... Small diameter roller 43a, 43b ... Belt Md ... Mandrel

Claims (4)

Forming a reinforcing layer braided with a reinforcing yarn on a rubber substrate;
Forming an adhesive layer on the reinforcing layer;
Forming an outer rubber layer on the reinforcing layer formed with the adhesive layer;
Vulcanizing after forming the outer rubber layer;
A method for manufacturing a reinforcing hose comprising:
A step of unraveling to homogenize the bending rigidity by compressing the vulcanized reinforcing hose.
The loosening process
A plurality of rollers arranged along a conveying path of the reinforcing hose, a belt which is spanned by the rollers and arranged at an interval narrower than an outer diameter D0 of the reinforcing hose, and conveys the reinforcing hose by driving the rollers; Using a loosening device with
When the outer diameter when the reinforcing hose is compressed to be flat is D1, and (D0−D1) × 100 / D0 is the compression ratio, the gap of the belt is set so that the compression ratio is 5 to 20%. A method of manufacturing a reinforcing hose characterized by passing through . Forming a reinforcing layer braided with a reinforcing yarn on a rubber substrate;
Forming an adhesive layer on the reinforcing layer;
Forming an outer rubber layer on the reinforcing layer formed with the adhesive layer;
Vulcanizing after forming the outer rubber layer;
A method for manufacturing a reinforcing hose comprising:
Comprising a step of unraveling to homogenize bending rigidity by compressing the reinforced hose after vulcanization,
The loosening process
Using a loosening device having rollers arranged above and below the conveyance path along the conveyance path of the reinforcement hose and rollers arranged on the left and right of the conveyance path, the reinforcement hose is interposed between the upper and lower and left and right rollers. The reinforcing hose is compressed from two directions by passing through the reinforcing hose. In the manufacturing method of the reinforcement hose of Claim 2 ,
The method of manufacturing a reinforcing hose, wherein the surface of the roller for compressing the reinforcing hose is a concave curved surface. In the manufacturing method of the reinforcement hose of Claim 2 or Claim 3 ,
The above-mentioned unraveling treatment is performed when the outer diameter of the reinforcing hose is D0, the outer diameter when the reinforcing hose is compressed to be flat is D1, and the compression ratio is (D0−D1) × 100 / D0. The manufacturing method of the reinforcement hose which set 5-20%.

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