JP5542424B2 - Composite hose - Google Patents

Description

  The present invention relates to a composite hose that uses both rubber and a thermoplastic resin as a material for the hose.

  Conventionally, as a composite hose using both rubber and thermoplastic resin, for example, as in Patent Document 1, an inner layer rubber tube, and a reinforcing layer in which a reinforcing thread is wound around the outer peripheral surface of the inner layer rubber tube, A composite hose having an intermediate rubber layer disposed on the outer peripheral surface of the reinforcing layer and an outer layer made of a thermoplastic resin on the outer peripheral surface of the intermediate rubber layer is known. In such a composite hose, an adhesive containing a volatile organic solvent is used when the outer peripheral surface of the vulcanized intermediate rubber layer is coated with the outer layer of the thermoplastic resin.

Japanese Patent Laid-Open No. 11-153264

  However, considering environmental issues, a composite hose that does not use an adhesive containing a volatile organic solvent is desirable. However, if the intermediate rubber layer and the outer layer are not bonded, the bonding force between the intermediate rubber layer and the outer layer is reduced, resulting in a composite When the hose is twisted, the outer layer shifts with respect to the intermediate rubber layer, and when the composite hose is bent, the outer layer floats from the intermediate rubber layer and wrinkles are generated in the outer layer.

  The present invention has been made to solve the above problems, and an object thereof is to obtain a composite hose that can improve the bonding force between the intermediate rubber layer and the outer layer without using an adhesive.

The composite hose according to the first aspect of the present invention includes an inner layer rubber tube disposed on the inner peripheral portion of the hose, one or more reinforcing layers in which reinforcing yarns are disposed on the outer peripheral surface of the inner layer rubber tube, An intermediate rubber layer disposed on the outer peripheral surface and having a plurality of concave and convex portions formed on the outer peripheral surface, and a plurality of intermediate rubber layers disposed on the outer peripheral surface of the intermediate rubber layer and meshed with the plurality of concave and convex portions of the intermediate rubber layer on the inner peripheral surface An outer layer made of a thermoplastic resin on which the concavo-convex portion is formed, and the distance between the top and bottom of the plurality of concavo-convex portions of the intermediate rubber layer is 10% or more and 50% or less of the thickness of the intermediate rubber layer It is.

A plurality of uneven portions are formed on the outer peripheral surface of the intermediate rubber layer, and the inner peripheral surface of the outer layer made of a thermoplastic resin disposed on the outer peripheral surface of the intermediate rubber layer meshes with the plurality of uneven portions on the intermediate rubber layer. An uneven portion is formed. For this reason, the intermediate rubber layer and the outer layer can be joined by engagement of the respective concavo-convex portions without adhering the intermediate rubber layer and the outer layer made of the thermoplastic resin. As a result, the bonding force between the intermediate rubber layer and the outer layer can be improved without using an adhesive, so that when the composite hose is twisted, the outer layer can be prevented from shifting with respect to the intermediate rubber layer, and when the composite hose is bent. It is possible to prevent the outer layer from floating from the intermediate rubber layer and generating wrinkles in the outer layer. In addition, if the distance between the top and bottom of the plurality of uneven portions of the intermediate rubber layer is less than 10% of the thickness of the intermediate rubber layer, the engagement of the uneven portions of the intermediate rubber layer and the outer layer is too shallow, If it exceeds 50%, the thickness of the concave portion of the intermediate rubber layer becomes thin, and production defects such as rubber breakage are likely to occur.

The invention according to claim 2 is the composite hose according to claim 1, wherein the width of the bottom portion of the plurality of uneven portions of the intermediate rubber layer is one pitch of the uneven portion of the intermediate rubber layer along the circumferential direction of the hose. 25% or more and 75% or less.

If the width of the bottom of the plurality of uneven portions formed on the intermediate rubber layer is less than 25% of one pitch of the uneven portions of the intermediate rubber layer along the circumferential direction of the hose, the rigidity of the convex portions becomes too low, and the intermediate rubber The joint between the layer and the outer layer made of thermoplastic resin is likely to break. Also, if the width of the bottom of the plurality of uneven portions formed on the intermediate rubber layer exceeds 75% of one pitch of the uneven portions of the intermediate rubber layer along the circumferential direction of the hose, the rigidity of the convex portions on the outer layer side decreases. Therefore, the joint portion between the intermediate rubber layer and the outer layer made of the thermoplastic resin is easily damaged.

The invention according to claim 3 is the composite hose according to claim 1 or 2, wherein the plurality of uneven portions of the intermediate rubber layer are linear along the hose longitudinal direction at a predetermined pitch in the hose circumferential direction. Is formed.

Since the plurality of uneven portions in the intermediate rubber layer extend linearly along the hose longitudinal direction at a predetermined pitch in the hose circumferential direction, the uneven portions can be easily formed on the outer peripheral surface of the intermediate rubber layer. The productivity of the composite hose is improved.

As described above, the composite hose according to the first aspect of the present invention can improve the bonding force between the intermediate rubber layer and the outer layer without using an adhesive. Further, the joint between the intermediate rubber layer and the outer layer is difficult to peel off, and it is difficult to form a gap between the intermediate rubber layer and the thermoplastic resin.

In the composite hose according to the second aspect of the present invention, the joint portion between the intermediate rubber layer and the outer layer is hardly damaged.

The composite hose according to the third aspect of the present invention can improve productivity.

It is the perspective view which made the cross section the part which shows the composite hose which concerns on 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. It is the perspective view which made the cross section the part which shows the composite hose which concerns on 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 2 which shows the composite hose which concerns on 3rd Embodiment of this invention. It is sectional drawing corresponding to FIG. 2 which shows the composite hose which concerns on 4th Embodiment of this invention.

  A first embodiment of the present invention will be described below with reference to FIGS.

  1 is a perspective view, partly in section, showing the composite hose according to the first embodiment of the present invention, and FIG. 2 is a sectional view taken along the line 2-2 in FIG.

  As shown in FIGS. 1 and 2, the composite hose 10 of the present embodiment has an inner rubber tube 12 disposed on the inner peripheral portion of the composite hose 10 and a reinforcing thread disposed on the outer peripheral surface of the inner rubber tube. Two reinforcing layers 14 and 16, an intermediate rubber layer 18 disposed on the outer peripheral surface of the outer peripheral reinforcing layer 16, and an outer layer 20 made of a thermoplastic resin formed on the outer peripheral surface of the intermediate rubber layer 18. I have.

  The inner rubber tube 12 is made of rubber that can withstand the intended use. For water resistant applications, ethylene-propylene rubber (EPDM), SBR, etc., and for oil resistant applications, NBR, CR, etc. are used. In this embodiment, EPDM is used.

  The reinforcing yarns used for the reinforcing layers 14 and 16 use synthetic fibers such as vinylon, polyester, polyamide, and aramid. You may use metal wires, such as a mild steel wire, by use temperature and a use. In the present embodiment, it is preferable to use vinylon when the composite hose 10 is used at a temperature of less than 100 ° C., and when it exceeds 100 ° C., use an aromatic polyamide fiber or a mild steel wire. In particular, vinylon is inexpensive and is desired to be used at all operating temperatures. However, since hot water may cause hydrolysis, the operating temperature is set to less than 100 ° C.

  In addition, the intermediate rubber layer 18 formed on the reinforcing layer 16 is mainly used to ensure the bonding with the inner rubber layer, and is preferably the same type or a bondable rubber with the inner rubber layer. In this embodiment, nitrile rubber (NBR) is the main component. In addition, a plurality of concave and convex portions 28 including concave portions 24 and convex portions 26 are formed on the outer peripheral surface of the intermediate rubber layer 18, and the plurality of concave and convex portions 28 are arranged at a predetermined pitch in the circumferential direction of the composite hose 10. In addition, the composite hose 10 is continuously formed linearly along the hose longitudinal direction (left-right direction in FIG. 1).

  Further, on the inner peripheral surface of the outer layer 20, irregularities comprising a plurality of convex portions 38 that enter the plurality of concave portions 24 of the intermediate rubber layer 18 and a plurality of concave portions 40 that include the plurality of convex portions 26 of the intermediate rubber layer 18. The portions 36 are continuously formed in a straight line along the hose longitudinal direction (the left-right direction in FIG. 1) of the composite hose 10 at a predetermined pitch in the circumferential direction of the composite hose 10. For this reason, the intermediate rubber layer 18 and the outer layer 20 are bonded to each other by the engagement of the concavo-convex portions 28 and 36 without bonding the intermediate rubber layer 18 and the outer layer 20.

  The resin layer of the outer layer 20 is made of a thermoplastic resin for easy heat-sealing processing, and olefinic TPE, polyvinyl chloride (PVC), polyurethane resin, styrene resin, etc. are mainly used in warm water below 100 ° C. When the temperature exceeds 100 ° C., olefinic TPE, silicone resin, polyamide resin and the like can be used.

  The hardness of these resins is preferably 50 to 70 ° in order to ensure flexibility as the composite hose 10. In addition, the composite hose 10 can be easily colored by using the outer layer 20 as a resin layer.

  In the present embodiment, as shown in FIG. 1, the inner diameter D1 of the composite hose 10 is 13.0 mm, the outer diameter D2 is 19.8 mm, and the outer diameter D3 of the intermediate rubber layer 18 is 17.9 mm. .

  Further, as shown in FIG. 2, the thickness T1 of the intermediate rubber layer 18 is 0.8 mm, the distance between the top and bottom of the concavo-convex portion 28 (height of the convex portion 26) T2 is 0.2 mm, The width (circumferential length) W1 of the bottom part (root part) of the convex part 26 is 0.8 mm, the width W2 (circumferential length) of the top part (upper side) of the convex part 26 is 0.6 mm, and the uneven part 28. One pitch P1 along the circumferential direction of the hose is 1, 3 mm.

  The dimensions D1, D2, D3, T1, T2, W1, W2, and P1 of the composite hose 10 of the present invention are not limited to the above values.

  Next, the manufacturing method of the composite hose 10 of this embodiment is demonstrated.

  As the first step, the inner layer rubber tube 12 is extruded on the rubber or resin mandle to a specified thickness.

  Next, as a second step, a reinforcing yarn made of synthetic fiber yarn is wound around the outer peripheral surface of the inner rubber tube 12 to form the reinforcing layers 14 and 16. The winding structure is spiral, and the first reinforcing layer 14 and the second reinforcing layer 16 are wound in opposite directions.

  Next, as a third step, the intermediate rubber layer 18 is extruded to a specified thickness on the outer peripheral surface of the second reinforcing layer 16 on the outer peripheral side. At that time, a plurality of concave and convex portions 28 including concave portions 24 and convex portions 26 are formed on the outer peripheral surface of the intermediate rubber layer 18 along the hose longitudinal direction (left and right direction in FIG. 1) of the composite hose 10.

  Next, as a fourth step, the rubber hose is formed by vulcanizing at a specified temperature for a certain period of time and extracting the mandle after vulcanization.

  Next, as a fifth step, a thermoplastic resin is extruded to a predetermined thickness on the outer peripheral surface of the intermediate rubber layer 18 of the vulcanized rubber hose to form the outer layer 20.

  At this time, uneven portions 36 meshing with the plurality of uneven portions 28 of the intermediate rubber layer 18 are formed on the inner peripheral surface of the extruded outer layer 20.

  Next, the effect of the composite hose 10 of this embodiment is demonstrated.

  In the composite hose 10 of the present embodiment, a plurality of uneven portions 28 of the composite hose 10 are formed on the outer peripheral surface of the intermediate rubber layer 18 at a predetermined pitch in the circumferential direction of the composite hose 10 (see FIG. 1). Of the outer layer 20 made of thermoplastic resin disposed on the outer peripheral surface of the intermediate rubber layer 18, a plurality of intermediate rubber layers 18 are formed on the inner rubber layer 18. An uneven portion 36 that is engaged with the uneven portion 28 is formed.

  For this reason, the uneven | corrugated | grooved part 28 of the intermediate | middle rubber layer 18 and the uneven | corrugated | grooved part 28 of the outer layer 20 do not adhere | attach the intermediate | middle rubber layer 18 and the outer layer 20 which consists of thermoplastic resins using the adhesive agent containing a volatile organic solvent. Mesh with each other. As a result, since it is environmentally friendly and the bonding force between the intermediate rubber layer 18 and the outer layer 20 is improved, when the composite hose 10 is twisted, the outer layer 20 can be prevented from shifting with respect to the intermediate rubber layer 18, and the composite hose can be prevented. It is possible to prevent the outer layer 20 made of a thermoplastic resin from floating from the intermediate rubber layer 18 and causing wrinkles in the outer layer 20 when the 10 is bent.

  In the composite hose 10 of the present embodiment, even when the composite hose 10 is bent to a bending radius (R = 39.6 mm) that is twice the outer diameter D2 (19.8 mm) of the composite hose 10, the outer layer 20 is an intermediate rubber. There was no occurrence of wrinkles in the outer layer 20 floating from the layer 18.

  Moreover, in the composite hose 10 of this embodiment, even if one end part of the composite hose 10 having a length of 0.5 m is fixed and the other end part is twisted 360 ° around the axis, the outer layer 20 is an intermediate rubber layer. There was no occurrence of wrinkles and deviations between the intermediate rubber layer 18 and the outer layer 20 in the outer layer 20 floating from 18.

  Further, in the composite hose 10 of the present embodiment, the plurality of uneven portions 28 in the intermediate rubber layer 18 extends linearly along the longitudinal direction of the composite hose 10. For this reason, the uneven | corrugated | grooved part 28 can be easily formed in the outer peripheral surface of the intermediate | middle rubber layer 18, and the productivity of the composite hose 10 can be improved.

  Moreover, in the composite hose 10 of this embodiment, the distance (height of the convex part 26) T2 of the top part and the bottom part in the uneven | corrugated | grooved part 28 of the intermediate | middle rubber layer 18 is 0.2 mm. This is because when T2 is less than 10% (0.08 mm) of the thickness T1 of the intermediate rubber layer 18 (0.08 mm), the engagement between the uneven portions of the intermediate rubber layer 18 and the outer layer 20 is too shallow. This is because the thickness of the concave portion of the intermediate rubber layer 18 becomes thin and manufacturing defects such as rubber breakage are likely to occur when the percentage exceeds 0.4% (0.4 mm).

  In the composite hose 10 of the present embodiment, the bottom width W1 of the plurality of uneven portions 28 is 25% or more and 75% or less of one pitch P1 of the uneven portions 28. In other words, the total sum of the lengths of the plurality of convex portions 26 (top portions) in the hose circumferential direction is 25% or more and 75% or less of the circumferential length of the intermediate rubber layer 18.

  This is because when the bottom width W1 of the plurality of uneven portions 28 is less than 25% of one pitch P1 of the uneven portions 28, the rigidity of the convex portions 26 of the intermediate rubber layer 18 becomes too low, and the intermediate rubber layer 18 When the joint portion with the outer layer 20 made of a thermoplastic resin is easily damaged, and the width W1 of the bottom portion of the plurality of uneven portions 28 exceeds 75% of one pitch P1 of the uneven portion 28, the convex portions 38 on the outer layer 20 side This is because the rigidity becomes too low and the joint portion between the intermediate rubber layer 18 and the outer layer 20 made of the thermoplastic resin is easily damaged.

Next, a second embodiment of the present invention will be described with reference to FIG.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 3 is a perspective view, partly in section, showing a composite hose according to a second embodiment of the present invention. In this embodiment, an uneven portion 28 formed on the outer peripheral surface of the intermediate rubber layer 18 is meandering. The composite hose 10 extends in a wave shape along the longitudinal direction. The uneven portion 36 on the inner peripheral surface of the outer layer 20 also extends in a wavy shape along the longitudinal direction of the composite hose 10 while meandering.

  Therefore, in the present embodiment, the plurality of uneven portions 28 in the intermediate rubber layer 18 and the plurality of uneven portions 36 in the outer layer 20 extend in a wavy shape along the longitudinal direction of the composite hose 10 while meandering. The length of the joint between the layer 18 and the outer layer 20 made of thermoplastic resin is increased. For this reason, the bonding strength between the intermediate rubber layer 18 and the outer layer 20 made of the thermoplastic resin is further improved as compared with the first embodiment.

Next, a third embodiment of the present invention will be described with reference to FIG.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 4 is a cross-sectional view corresponding to FIG. 2 of the composite hose according to the third embodiment of the present invention. In this embodiment, the width W1 of the bottom of the convex portion 26 and the width W2 of the top of the concave and convex portion 28 are equal. (W1 = W2). For this reason, the bonding strength between the intermediate rubber layer 18 and the outer layer 20 made of the thermoplastic resin is further improved as compared with the first embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 5 is a cross-sectional view of the composite hose according to the fourth embodiment of the present invention corresponding to FIG. 2. In this embodiment, the width W1 of the bottom of the convex portion 26 in the concavo-convex portion 28 is smaller than the width W2 of the top portion. (W1 <W2). For this reason, the bonding strength between the intermediate rubber layer 18 and the outer layer 20 made of the thermoplastic resin is further improved as compared with the third embodiment.

[Other Embodiments]

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in each of the above embodiments, the uneven portion 28 and the uneven portion 36 are continuously formed along the longitudinal direction of the composite hose 10, but the uneven portion 28 and the uneven portion 36 are intermittent along the longitudinal direction of the composite hose 10. It is good also as the structure formed objectively (with a space | interval).

DESCRIPTION OF SYMBOLS 10 Composite hose 12 Inner layer rubber pipe 14 Reinforcement layer 16 Reinforcement layer 18 Intermediate rubber layer 20 Outer layer 24 Concave part 26 Convex part 28 Concave part 36 Concave part 38 Convex part 40 Concave part D1 Inner diameter of composite hose D2 Outer diameter of composite hose D3 Intermediate rubber layer Outer diameter P1 1 pitch of uneven part T1 thickness of intermediate rubber layer T2 height of convex part W1 width of bottom part of convex part W2 width of top part of convex part

Claims (3)

An inner layer rubber tube disposed on the inner peripheral portion of the hose, one or more reinforcing layers in which reinforcing threads are disposed on the outer peripheral surface of the inner layer rubber tube, and a plurality of irregularities disposed on the outer peripheral surface of the reinforcing layer. An intermediate rubber layer having a portion formed thereon, and a thermoplastic resin disposed on the outer peripheral surface of the intermediate rubber layer and formed with a plurality of concave and convex portions meshing with the plurality of concave and convex portions of the intermediate rubber layer on the inner peripheral surface. And a distance between a top portion and a bottom portion of the plurality of uneven portions of the intermediate rubber layer is 10% or more and 50% or less of a thickness of the intermediate rubber layer . 2. The composite hose according to claim 1, wherein a width of a bottom portion of the plurality of uneven portions of the intermediate rubber layer is 25% or more and 75% or less of one pitch of the uneven portions of the intermediate rubber layer along a circumferential direction of the hose. The composite hose according to claim 1 or 2, wherein the plurality of concave and convex portions of the intermediate rubber layer are formed linearly along the hose longitudinal direction at a predetermined pitch in the hose circumferential direction .

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