Spiral line reinforced rubber hose

Abstract

Disclosed is a spiral-line-reinforced rubber hose comprising a hose body (10) provided with reinforcing layers (14, 16, 18, 20) formed by helically winding wire harnesses (31, 32) in which a plurality of metal wires (30) are arranged adjacently, the wire density of the metal wires (30) of the reinforcing layers (14, 16, 18, 20) being 40-80%, the wire harness spacing between adjacent wire harnesses (31, 32) being 1 mm or less, and the wire harness spacing between adjacent wire harnesses (31, 32) being 1 mm or less. Therefore, the spiral-line-reinforced rubber hose is set to have an appropriate linear density with appropriate pressure resistance which is not high pressure, does not generate pinhole breakage, has flexibility, and is low in cost.

Description

Technical Field

[0001] The invention relates to a spiral wire reinforced rubber hose. Background Art

[0002] A spirally reinforced hose including a hose body having a reinforcement layer formed by spirally winding metal wires has excellent high-pressure durability as described in Patent Document 1, for example, if the number of metal wires per unit area constituting the reinforcement layer, i.e., the wire density, is high.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-106554

[0006] Patent Document 1 discloses a spiral wire reinforced hose including a reinforcement layer formed by spirally winding a metal wire, wherein the wire density is as high as 90% or more and 100% or less.

[0007] When the linear density is high, the high pressure durability is excellent, but the flexibility is low and the cost is increased.

[0008] In applications where high pressure durability is not so required, the higher wire density spiral wire reinforced hose is more expensive and less flexible, which makes it difficult to use due to limited handling.

[0009] Therefore, there is a need for a low-cost spiral wire reinforced hose that has a certain degree of pressure resistance and flexibility.

[0010] Although the pressure resistance decreases when the wire density is reduced, a low-cost spiral wire-reinforced hose having moderate pressure resistance and flexibility can be realized. Summary of the invention

[0011] Problem that the invention aims to solve

[0012] The spiral wire reinforced hose is manufactured by drawing a certain number of metal wires from a spool and arranging the wire bundles adjacent to each other, and winding the bundles in a spiral shape.

[0013] In the case of a spirally reinforced rubber hose having a reinforcement layer formed by spirally winding a metal wire bundle around an intermediate rubber layer, reducing the wire density increases the spacing between the wire bundles, making it easier for high-pressure fluid to penetrate the rubber through the increased spacing between the wire bundles and cause pinhole ruptures that protrude in the form of needles.

[0014] That is, if the linear density is reduced, the pressure at which pinhole rupture occurs (referred to as pinhole BP) decreases.

[0015] Generally speaking, in a spiral wire reinforced rubber hose, if the wire density is reduced, the pressure at which the hose body ruptures (referred to as hose body BP) also decreases.

[0016] The hose body rupture refers to a large rupture caused by the cutting of a plurality of metal wires.

[0017] When the wire density is reduced and the intervals between the wire bundles are increased, the reduction rate of the pinhole BP is greater than that of the hose body BP, so the pinhole BP may be lower than the hose body BP. As a result, the pinhole BP may rupture before the hose body ruptures.

[0018] Even if the hose body is in a state of withstanding the pressure with difficulty, the hose itself becomes unusable due to pinhole rupture.

[0019] The present invention has been made in view of this point, and its object is to provide a spiral wire reinforced rubber hose that has an appropriate wire density set to have moderate pressure resistance that is not high pressure, does not cause pinhole rupture before the hose body ruptures, has flexibility, and is low-cost.

[0020] Solutions for solving problems

[0021] In order to achieve the above object, the present invention provides a spiral wire reinforced rubber hose, which is composed of a hose body having a reinforcement layer formed by spirally winding a metal wire, and the spiral wire reinforced rubber hose is characterized in that:

[0022] The reinforcing layer is formed by spirally winding a bundle of a plurality of metal wires arranged adjacent to each other.

[0023] The linear density of the metal wires in the reinforcing layer is greater than or equal to 40% and less than or equal to 80%.

[0024] The bundle interval between adjacent bundles is 1 mm or less.

[0025] According to this structure, since the wire density of the metal wire of the reinforcing layer is greater than 40% and less than 80%, the hose body of the spiral wire reinforced rubber hose has moderate pressure resistance that is not high pressure and is flexible, while being able to achieve low cost, and by setting the wire bundle spacing between adjacent wire bundles to less than 1 mm, pinhole rupture can be prevented from occurring before the hose body ruptures.

[0026] That is, if the linear density is 80% or more, the hose body loses flexibility and the cost becomes high.

[0027] If the linear density is less than 40%, the pinhole BP decreases extremely greatly, and pinhole breakage is likely to occur.

[0028] In the preferred technical solution of the present invention,

[0029] The wire diameter of the metal wire is greater than or equal to 0.30 mm and less than or equal to 0.80 mm.

[0030] According to this configuration, by setting the wire diameter of the metal wire to 0.30 mm or more and 0.80 mm or less, the number of metal wires constituting the helically wound wire harness can be set to 2 to 6 wires suitable for helically winding the wire harness with high accuracy.

[0031] In the preferred technical solution of the present invention,

[0032] The reinforcement layer has more than 3 layers and less than 5 layers.

[0033] According to this structure, if the number of reinforcing layers is 6 or more, the hose body loses flexibility and the cost is high. If the number of reinforcing layers is 2 or less, the spirally reinforced rubber hose is prone to pinhole rupture and hose body rupture under too low pressure.

[0034] Effects of the Invention

[0035] Since the wire density of the metal wire of the reinforcing layer of the present invention is greater than 40% and less than 80%, the hose body of the spiral wire reinforced rubber hose has moderate pressure resistance that is not high pressure and is flexible, while being able to achieve low cost. In addition, by setting the wire bundle spacing between adjacent wire bundles to less than 1 mm, pinhole rupture can be prevented from occurring before the hose body ruptures. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a perspective view showing a partially cutaway view of a hose body of a spirally reinforced rubber hose according to an embodiment of the present invention.

[0037] Figure 2 This is a partial enlarged view of the first reinforcement layer of the hose body.

[0038] Figure 3 This is a partial enlarged view of the reinforcement layer of the comparative example.

[0039] Figure 4 This is a schematic diagram of a winding device.

[0040] Figure 5A This is a table showing the results of a simulated pressure resistance performance test of the comparative example among the examples and comparative examples having different structures of the reinforcement layer.

[0041] Figure 5B This is a table showing the results of simulated pressure resistance performance tests of Examples and Comparative Examples having different structures of the reinforcement layer.

[0042] Figure 6 This is a graph showing the pinhole BP with respect to the linear density for Examples and Comparative Examples. DETAILED DESCRIPTION

[0043] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

[0044] Figure 1 This is a perspective view showing a partially cutaway view of a hose body 10 of a spirally reinforced rubber hose 1 according to an embodiment of the present invention.

[0045] The spiral-reinforced rubber hose 1 is a hose used under medium and low pressures and is mainly used for transporting fluids and articles.

[0046] Reference Figure 1 The hose body 10 of the spiral wire reinforced rubber hose 1 is provided with an inner tube rubber layer 11 composed of a tubular rubber body on the inner side, and the lower wire 12 covers the outer side of the inner tube rubber layer 11 .

[0047] The inner tube rubber layer 11 has a function of ensuring airtightness of the fluid flowing inside.

[0048] The lower thread 12 is braided with chemical fibers and is a cover for protecting the inner tube rubber layer 11 when the thread is wound.

[0049] A first intermediate rubber layer 13 is provided on the outer side of the lower wire 12 , and a first reinforcing layer 14 is formed on the outer side of the first intermediate rubber layer 13 .

[0050] Furthermore, a second intermediate rubber layer 15 is provided on the outer side of the first reinforcing layer 14 , and a second reinforcing layer 16 is formed on the outer side of the second intermediate rubber layer 15 .

[0051] Similarly, a third intermediate rubber layer 17 is provided on the outer side of the second reinforcing layer 16 , a third reinforcing layer 18 is formed on the outer side of the third intermediate rubber layer 17 , a fourth intermediate rubber layer 19 is provided on the outer side of the third reinforcing layer 18 , and a fourth reinforcing layer 20 is formed on the outer side of the fourth intermediate rubber layer 19 .

[0052] An outer covering rubber layer 21 is provided on the outer side of the fourth reinforcement layer 20 , and the outer peripheral surface of the hose body 10 is covered with the outer covering rubber layer 21 .

[0053] Therefore, first to fourth intermediate rubber layers 13 , 15 , 17 , 19 and first to fourth reinforcing layers 14 , 16 , 18 , 20 are alternately stacked between the lower thread 12 covering the inner tube rubber layer 11 and the outer cover rubber layer 21 .

[0054] Thus, the hose body 10 includes four reinforcement layers 14 , 16 , 18 , and 20 .

[0055] The first to fourth reinforcing layers 14 , 16 , 18 , and 20 are layers formed by spirally winding a metal wire 30 , and have a function of maintaining the pressure resistance of the hose.

[0056] The first to fourth intermediate rubber layers 13 , 15 , 17 , and 19 prevent the reinforcing layers from being worn out due to friction with each other.

[0057] The outer rubber layer 21 has weather resistance and abrasion resistance for protecting the reinforcing layer from the external environment.

[0058] The first to fourth reinforcing layers 14, 16, 18, 20 of the spirally reinforced rubber hose 1 are layers formed by spirally winding a metal wire 30 on the outer peripheral surfaces of the first to fourth intermediate rubber layers 13, 15, 17, 19, and the spiral diameters gradually increase, but all have the same spiral structure.

[0059] exist Figure 2 A partial enlarged view of the first reinforcement layer 14 is shown in FIG.

[0060] like Figure 2 As shown, a wire bundle 31 in which three adjacent metal wires 30 are bundled together and a wire bundle 32 in which two adjacent metal wires 30 are bundled together are alternately wound in a spiral shape.

[0061] The intervals between the wire bundles 31 and 32 are formed alternately with a larger bundle interval D and a smaller bundle interval d.

[0062] exist Figure 3 In order to compare with the present reinforcing layers 14, 16, 18, 20, a comparative example is shown in which five adjacent metal wires 030 are wound spirally as a bundle of wires 031. Figure 3 is with Figure 2 The corresponding partial enlargement.

[0063] The bundle interval Do between the wire bundles 031 is constant.

[0064] exist Figure 4 2 shows a winding device 50 for spirally winding the wire harness 31 and the wire harness 32, and the winding device 50 will be described.

[0065] A roller support disk 53 having the same center axis Lc as the rotating disk 51 is supported on the surface of the rotating disk 51 by means of a support column 52 , and an annular winding positioning guide 55 having the same center axis Lc as the rotating disk 51 is supported on the roller support disk 53 by means of a leg member 54 .

[0066] The rotating disk 51 , the roller supporting disk 53 , and the winding positioning guide 55 have the same central axis Lc, are stacked upward in this order, and their outer diameters gradually decrease.

[0067] A gear 58 is integrally provided at the center portion of the back surface of the rotating disk 51 , and the gear 58 meshes with a driving gear 59 a of a driving motor 59 .

[0068] Therefore, when the driving motor 59 rotates the driving gear 59 a , the gear 58 meshing with the driving gear 59 a rotates together with the rotating disk 51 , so that the roller supporting disk 53 and the winding positioning guide 55 integrated with the rotating disk 51 rotate together.

[0069] The rotating disk 51 , the roller supporting disk 53 , and the winding positioning guide 55 have center holes 51 h , 53 h , and 55 h at the center portions through which the center axis Lc passes, and the mandrel 70 passes through the center holes 51 h , 53 h , and 55 h along the center axis Lc.

[0070] The mandrel 70 is inserted into the inner tube rubber layer 11 and supports the hose in the process of being manufactured, with the intermediate rubber layer R covering the outer side of the inner tube rubber layer 11 via the lower wire 12 on the central axis Lc.

[0071] By moving the mandrel 70 along the center axis Lc in the direction of arrow X and extruding the intermediate rubber layer R together with the inner tube rubber layer 11 onto the mandrel 70 using an extruder not shown, the intermediate rubber layer R is supported with the mandrel 70 inserted therein and is extruded in the direction of arrow X through the center holes 51h, 53h, and 55h.

[0072] A plurality of bobbins 60 are arranged at regular intervals in the circumferential direction on the rotating disk 51 , and a wire bundle B in which a plurality of wires 30 are arranged adjacent to each other is wound around the bobbin 60 .

[0073] Roller support bodies 61 are arranged on the roller support disk 53 at positions corresponding to the bobbins 60 , and guide rollers 62 are attached to the roller support bodies 61 .

[0074] The guide rollers 62 of the roller supports 61 guide the wire bundles drawn out from the bobbins 60 while rotating, and guide the wire bundles to predetermined positions inside the annular winding positioning guide 55 .

[0075] The winding positioning guide 55 is provided with comb teeth (not shown) in a ring-shaped inner side for dividing the wire harness B into two.

[0076] While the rotating disk 51, the roller supporting disk 53 and the winding positioning guide 55 rotate integrally around the central axis Lc, the intermediate rubber layer R is supported with the core rod 70 inserted therein, and is extruded in the direction of the arrow X through the center holes 51h, 53h, 55h of the rotating disk 51, the roller supporting disk 53 and the winding positioning guide 55.

[0077] During this process, the wire bundles B continuously drawn out from each spool 60 of the rotating rotating disk 51 are guided by the corresponding guide rollers 62 and guided to the predetermined positions of the winding positioning guide 55, separated by the comb teeth, and spirally wound on the intermediate rubber layer R moving in the direction of the arrow X to form a reinforcement layer S.

[0078] In the present embodiment, the wire bundle B wound on the bobbin 60 is composed of five metal wires 30 as a bundle, and the five adjacent metal wires 30 as one bundle are divided into a wire bundle 31 of three metal wires 30 and a wire bundle 32 of two metal wires 30 by comb teeth.

[0079] exist Figure 1 and Figure 2 2 shows the first reinforcing layer 14 formed by spirally winding the wire harness 31 and the wire harness 32 around the first intermediate rubber layer 13 in this manner.

[0080] on the other hand, Figure 3 The reinforcement layer of the comparative example shown is a reinforcement layer formed by spirally winding five adjacent metal wires 030 as a wire bundle 031 without being divided around the intermediate rubber layer.

[0081] That is, the reinforcement layer is formed by: Figure 4 In the winding device 50 shown, a winding positioning guide without comb teeth is used instead of the winding positioning guide 55 provided with comb teeth. The wire harness 031 is spirally wound around the intermediate rubber layer without being divided under the same conditions.

[0082] Figure 2 The bundle spacing D between the bundles 31 and 32 of the first reinforcing layer 14 of the present embodiment shown is larger than that of the bundles 31 and 32 of the first reinforcing layer 14 of the present embodiment shown in FIG. Figure 3 In the comparative example shown, the bundle interval Do between the bundles 031 of the reinforcing layer is small.

[0083] The reason for this is that by dividing the wire bundle 031 consisting of five metal wires 030 as a bundle into a wire bundle 31 consisting of three metal wires 30 as a bundle and a wire bundle 32 consisting of two metal wires 30 as a bundle, a smaller bundle spacing d is generated between the wire bundle 31 and the wire bundle 32, so that the bundle spacing Do formed when the wires are not divided becomes smaller, resulting in a larger bundle spacing D (<Do).

[0084] Figure 5A and Figure 5B This is a table showing the results of simulated pressure resistance tests on examples of different structures of the reinforcing layer of a spiral-reinforced rubber hose. Figure 5A The simulation results for the three comparative examples 1, 2, and 3 are shown. Figure 5B The simulation results of the three embodiments 1, 2, and 3 are shown.

[0085] The spiral reinforced rubber hose to be simulated is Figure 1 In the structure shown, the inner tube rubber layer 11, the bottom line 12, the first intermediate rubber layer 13, the first reinforcement layer 14, the second intermediate rubber layer 15, the second reinforcement layer 16, the third intermediate rubber layer 17, the third reinforcement layer 18, the fourth intermediate rubber layer 19, the fourth reinforcement layer 20, and the outer cover rubber layer 21 are stacked in this order from the inside to the outside.

[0086] The conditions of the spiral wire reinforced rubber hose are as follows.

[0087] Hoses inner diameter: 32mm

[0088] Thickness of inner tube rubber layer: 1.0mm (0.9mm~1.5mm)

[0089] Thickness of the first intermediate rubber layer, the second intermediate rubber layer, the third intermediate rubber layer, and the fourth intermediate rubber layer: 0.17 mm (0.07 mm to 0.27 mm)

[0090] Thickness of outer rubber layer: 1.30mm (0.40mm~2.20mm)

[0091] Inner tube rubber layer material: NBR mixed rubber

[0092] Material of the 1st intermediate rubber layer, the 2nd intermediate rubber layer, the 3rd intermediate rubber layer, and the 4th intermediate rubber layer: NBR mixed rubber

[0093] Outer rubber layer material: CR series mixed rubber

[0094] Wire diameter of metal wires of the first reinforcing layer, the second reinforcing layer, the third reinforcing layer, and the fourth reinforcing layer: 0.38 mm The numerical value in () above is a preferred thickness of the rubber layer.

[0095] exist Figure 5A and Figure 5B In the table, the number of beat-up roots of the reinforcement layer structure refers to the number of metal wires 30 wired between one pitch of the spirally wound metal wire 30, and the wire density is the number of wires per unit area of ​​the metal wire constituting the reinforcement layer.

[0096] The number of standing wires refers to the number of wire bundles drawn out from a bobbin, which is equivalent to the number of bobbins, and the number of wires taken refers to the number of metal wires constituting the wire bundle wound on one bobbin.

[0097] Figure 5B Example 2 of the table is for the Figure 1 and Figure 2 The hose body 10 of the spirally reinforced rubber hose 1 of the present embodiment shown is an example of a simulated pressure resistance performance test.

[0098] Figure 5A Comparative Example 2 in the table corresponds to a comparative example having a reinforcing layer formed by spirally winding a bundle 031 of five adjacent metal wires 030 as one bundle. Figure 3 A partial enlarged view of the reinforcement layer is shown.

[0099] Figure 5B Example 2 of the table and Figure 5A Comparative Example 2 in the table has the same structure as that of 120 wefts, 65% line density, 24 stand wires, and 5 wefts. However, while in Comparative Example 2, the bundle of 5 metal wires unwound from the bobbin is not divided and is spirally wound around the intermediate rubber layer as it is, in Example 2, the bundle of 5 metal wires unwound from the bobbin is divided into a bundle of 3 metal wires (1) and a bundle of 2 metal wires (2), and is spirally wound around the intermediate rubber layer.

[0100] Compared with the comparative example 2 Figure 3 The wire bundle interval Do shown is 1.20 mm. In Example 2, Figure 2 The wire bundle spacing D shown is 0.60 mm, which is significantly smaller.

[0101] Therefore, in Comparative Example 2, the hose body BP, which is the pressure at which the hose body ruptures, is 74 MPa, and the pinhole BP, which is the pressure at which the pinhole ruptures, is 52 MPa, which is a lower pressure than the hose body BP.

[0102] On the other hand, in Example 2, the pressure of the pinhole BP is 104 MPa while the pressure of the hose body BP is 74 MPa, which is higher than the pressure of the hose body BP.

[0103] Both Example 2 and Comparative Example 2 have a linear density of 65%, and have a moderate pressure resistance of 74 MPa instead of a high pressure as the hose body BP, and have flexibility and are low cost.

[0104] However, in Comparative Example 2, since the bundle interval Do is 1.20 mm, the pinhole BP is 52 MPa, which is a much lower pressure than the hose body BP of 74 MPa, and thus the pinhole rupture occurs before the hose body ruptures.

[0105] On the other hand, in Example 2, since the bundle interval D is 0.60 mm, the pinhole BP is 104 MPa, which is a higher pressure than the hose body BP of 74 MPa, and thus the pinhole rupture can be prevented from occurring before the hose body ruptures.

[0106] Next, Figure 5A Table of Comparative Examples 1 and Figure 5B Example 1 of the table is examined.

[0107] Embodiment 1 and Comparative Example 1 have the same structure of 96 wefts, 50% line density, 24 stand, and 4 wefts. However, compared with Comparative Example 1, the bundle of four metal wires drawn out from the bobbin is not divided and is spirally wound on the intermediate rubber layer as it is, while Embodiment 1 divides the bundle of four metal wires drawn out from the bobbin into a bundle (1) and a bundle (2) of two metal wires each and spirally wound on the intermediate rubber layer.

[0108] While the bundle interval in Comparative Example 1 was 1.60 mm, the bundle interval in Example 1 was 0.80 mm, which was significantly smaller.

[0109] Therefore, in Comparative Example 1, the pressure of the pinhole BP is 39 MPa, which is lower than the pressure of the hose main body BP, while the pressure of the hose main body BP is 66 MPa.

[0110] On the other hand, in Example 1, the pressure of the pinhole BP is 78 MPa while the pressure of the hose body BP is 66 MPa, which is higher than the pressure of the hose body BP.

[0111] Both Example 1 and Comparative Example 1 have a linear density of 50%, and have a moderate pressure resistance of 66 MPa instead of a high pressure for the hose body BP, have flexibility, and can achieve low cost.

[0112] However, in Comparative Example 1, since the harness interval is 1.60 mm and the pinhole BP is 39 MPa, which is a lower pressure than the hose body BP of 66 MPa, the pinhole ruptures before the hose body ruptures. Even if the hose body is in a state of withstanding the pressure, the hose itself becomes unusable.

[0113] On the other hand, in Example 1, since the bundle interval is 0.80 mm, the pinhole BP is 78 MPa, which is a higher pressure than the hose body BP of 66 MPa, and thus the pinhole rupture can be prevented from occurring before the hose body ruptures.

[0114] Next, Figure 5A Table of Comparative Examples 3 and Figure 5B Example 3 of the table is examined.

[0115] Example 3 and Comparative Example 3 have the same structure in which two types of bobbins are mixed, namely, the number of beat-up wefts is 190, the linear density is 100%, the number of stand strands is 22 and the number of strands taken is 8, and the number of stand strands is 2 and the number of strands taken is 7.

[0116] However, compared to Comparative Example 3, in which the bundle of 8 metal wires and the bundle of 7 metal wires unwound from the bobbin are not divided and are spirally wound around the intermediate rubber layer as is, in Example 3, the bundle of 8 metal wires unwound from the bobbin is divided into a bundle of 4 metal wires (1) and a bundle of 2, and the bundle of 7 metal wires is divided into a bundle of 4 metal wires (1) and a bundle of 3 metal wires (2), and the bundles are spirally wound around the intermediate rubber layer.

[0117] In both Example 3 and Comparative Example 3, the linear density was 100%, and the high pressure of the hose body BP was 118 MPa.

[0118] That is, Example 3 and Comparative Example 3 have high pressure resistance of the hose body BP, but the linear density is 100%, the flexibility is poor, and the cost is also high.

[0119] In addition, although the line density was 100%, in Comparative Example 3, the line bundle interval was about 0.02 mm, and the pinhole BP became an extremely high pressure of 3041 MPa.

[0120] In Example 3, the wire density is also 100%, but the wire bundle interval is about 0.01 mm, and the pinhole BP becomes a higher pressure of 6082 MPa.

[0121] Therefore, Examples 1, 2, 3 and Comparative Example 3 were able to prevent the pinhole BP from being higher than the hose body BP and the pinhole rupture from occurring before the hose body ruptured.

[0122] However, Example 3 and Comparative Example 3 have a linear density of 100%, and therefore are suitable for high-pressure durable applications, but lack flexibility and are relatively costly.

[0123] Figure 6 The results of Examples 1, 2, and 3 and Comparative Examples 1, 2, and 3 are shown on a coordinate system in which the horizontal axis represents the linear density and the vertical axis represents the pinhole BP, and the graph shows the pinhole BP with respect to the linear density.

[0124] Example 1 Since the linear density is 50% and the pinhole BP is 78MPa, Figure 6 is drawn at point E1 in the coordinates of , and similarly, Example 2 is drawn at point E2.

[0125] However, Example 3 with a linear density of 100% cannot be used because the pinhole BP is too large, which is 6082 MPa. Figure 6 The point E3 is represented in the coordinates of .

[0126] Comparative Example 1 has a linear density of 50% and a pinhole BP of 39 MPa. Figure 6 is plotted at point C1 in the coordinates of , and similarly, Comparative Example 2 is plotted at point C2.

[0127] However, the comparative example 3 with a linear density of 100% could not be used because the pinhole BP was too large, 3041 MPa. Figure 6 The point C3 is represented in the coordinates of .

[0128] exist Figure 6 In the coordinates, the curve connecting the points E1, E2 and E3 representing the results of Examples 1, 2 and 3 is represented by a single-dash line, and the curve connecting the points C1, C2 and C3 representing the results of Comparative Examples 1, 2 and 3 is represented by a double-dash line.

[0129] exist Figure 6 The hose body BP when the line density is 50%, 65%, and 100% can be plotted in the coordinates, and a curve connecting the points is represented by a solid line.

[0130] In addition, Figure 6 The hose body BP when the line density is 100% cannot be expressed in the coordinates of .

[0131] On inspection Figure 6 In the graph shown, if the pinhole BP is not on the solid line curve of the hose body BP, it is impossible to prevent the pinhole rupture from occurring before the hose body ruptures.

[0132] Therefore, in the comparative example, when the line density is smaller than the line density at the point P where the double-dashed line curve intersects the solid line curve of the hose body BP, including comparative examples 1 and 2, the pinhole BP becomes a pressure lower than that of the hose body BP, and it is impossible to prevent the pinhole from rupturing before the hose body ruptures.

[0133] In the embodiment, when the line density is greater than the line density at the point Q where the one-dot chain line curve intersects the solid line curve of the hose body BP, including Examples 1 and 2, the pinhole BP becomes a pressure higher than the hose body BP, and the pinhole rupture can be prevented from occurring before the hose body ruptures.

[0134] At point P where the two-dot chain curve of the comparative example intersects the solid curve of the hose body BP, the line density is about 80%, and at point Q where the one-dot chain curve of the example intersects the solid curve of the hose body BP, the line density is about 40%.

[0135] Therefore, for a spirally reinforced rubber hose having a hose body with a reinforcing layer having a wire bundle interval of 1 mm or less as in Examples 1 and 2, if the wire density is 40% to 80%, the pinhole BP becomes a higher pressure than the hose body BP, and pinhole rupture can be prevented from occurring before the hose body ruptures.

[0136] When the linear density is 80% or more, the flexibility is lost and the cost is high.

[0137] In addition, the linear density is preferably 50% or more.

[0138] Furthermore, in consideration of the deterioration of the spiral wire-reinforced rubber hose due to long-term use, the wire bundle interval is more preferably 0.8 mm or less.

[0139] The wire diameter of the metal wire in Examples 1 and 2 is 0.38 mm, but any diameter may be 0.30 mm or more and 0.80 mm or less.

[0140] When the wire diameter of the metal wire is 0.30 mm or more and 0.80 mm or less, the number of metal wires constituting the wire bundle helically wound around the intermediate rubber layer can be set to 2 to 6, which is suitable for helically winding the wire bundle with high accuracy.

[0141] In Examples 1 and 2, four reinforcing layers, namely the first to fourth reinforcing layers 14 , 16 , 18 , and 20 , are provided, but the number of reinforcing layers may be 3 or more and 5 or less.

[0142] If the number of reinforcing layers is six or more, the flexibility of the hose body 10 is poor and the cost is high.

[0143] On the other hand, if the number of reinforcing layers is two or less, the spirally reinforced rubber hose is prone to pinhole rupture and hose body rupture at an excessively low pressure.

[0144] By like Figure 4 The winding device 50 shown in the figure uses a comb-like dividing component to divide the wire bundle released from the spool, and the divided wire bundle is spirally wound on the middle rubber layer to form a reinforcement layer, thereby easily forming a reinforcement layer with a wire bundle spacing of less than 1 mm while maintaining the previous number of vertical roots (the number of spools).

[0145] As mentioned above, the spiral wire reinforced rubber hose according to one embodiment of the present invention has been described, but the aspects of the present invention are not limited to the above-mentioned embodiment, and include aspects that can be implemented in various aspects within the scope of the gist of the present invention.

[0146] Description of Reference Numerals

[0147] 1. Spiral wire reinforced rubber hose; 10. Hose body; 11. Inner tube rubber layer; 12. Lower wire; 13. First intermediate rubber layer; 14. First reinforcement layer; 15. Second intermediate rubber layer; 16. Second reinforcement layer; 17. Third intermediate rubber layer; 18. Third reinforcement layer; 19. Fourth intermediate rubber layer; 20. Fourth reinforcement layer; 21. Outer rubber layer; 30. Metal wire; 31. Wire harness; 32. Wire harness; 50. Winding device; 51. Rotating disk; 52. Support column; 53. Roller support disk; 54. Leg member; 55. Winding positioning guide; 58. Gear; 59. Driving motor; 60. Bobbin; 61. Roller support body; 62. Guide roller; 030. Metal wire; 031. Wire harness; B. Wire harness; R. Middle rubber layer; S. Reinforcement layer.

Claims

1. A spiral wire reinforced rubber hose, comprising a hose body (10) having a reinforcement layer (14, 16, 18, 20) formed by spirally winding a metal wire (30), wherein the spiral wire reinforced rubber hose is characterized in that: The reinforcing layers (14, 16, 18, 20) are formed by spirally winding a wire bundle (31, 32) formed by arranging a plurality of metal wires (30) adjacent to each other. The wire density of the metal wire (30) of the reinforcing layer (14, 16, 18, 20) is greater than 40% and less than 80%, The bundle interval between adjacent bundles (31, 32) is 1 mm or less.

2. The spirally reinforced rubber hose according to claim 1, characterized in that: The wire diameter of the metal wire (30) is greater than or equal to 0.30 mm and less than or equal to 0.80 mm.

3. The spirally reinforced rubber hose according to claim 1 or 2, characterized in that: The reinforcement layers (14, 16, 18, 20) are at least 3 layers and at most 5 layers.

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