JPH08207110A - Flexible hose and extrusion molding thereof - Google Patents

Abstract

PURPOSE: To obtain a flexible hose excellent in heat resistance and strong in stiffness and to reduce the number of manufacturing processes. CONSTITUTION: The inner rubber 12 of a flexible hose 11 is formed into a pipe shape using a copolymer material consisting of 10-50wt.% of silicone rubber and 50-90wt.% of ethylene/propylene rubber and reinforcing yarns 13 are knitted into the outer peripheral surface of the inner rubber 12. The outer peripheral surface of the inner rubber 12 into which the reinforcing yarns 13 are knitted is covered with outer rubber 14 formed from a copolymer material consisting of 10-50wt.% of silicone rubber and 50-90wt.% of ethylene/propylene rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible hose having an inner diameter of 70 mm or more suitable for an intercooler hose for connecting a supercharger and an intercooler, or an intercooler and an intake manifold, and a method of extrusion molding the hose.

[0002]

2. Description of the Related Art Conventionally, a flexible hose of this type has been cut by inserting a cloth made of aramid fibers between a sheet-shaped inner rubber material and an outer rubber material formed of silicone rubber, respectively, and cutting them. After that, it is produced by winding the above-mentioned united product on a mandrel whose outer peripheral surface is coated with a release agent, and further vulcanizing the bandage in a spirally wound state to form a pleated shape on the outer peripheral surface. Things are known. After vulcanization, the bandage of this hose is removed, the pipe-shaped united product is pulled out from the mandrel, and further vulcanized. Since the flexible hose manufactured in this way has excellent heat resistance and is strong, it is suitable for intercooler hoses in which the positive and negative pressures repeatedly act inside the hose and the surroundings and inside of the hose become relatively hot. ing.

[0003]

However, in the above flexible hose, since the inner rubber and the outer rubber are formed of silicone rubber, it is difficult to perform extrusion molding, and the number of manufacturing steps is relatively large and the manufacturing cost is high. There was a problem pushing up.

An object of the present invention is to provide a flexible hose having excellent heat resistance, being strong, and capable of reducing the number of manufacturing steps, and an extrusion molding method thereof.

[0005]

A configuration of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The flexible hose of the present invention comprises a pipe-shaped inner rubber 12 made of a copolymer material of 10 to 50% by weight of silicone rubber and 50 to 90% by weight of ethylene propylene rubber, and an outer peripheral surface of the inner rubber 12. Reinforcing yarn 13 woven into
And an outer rubber 14 which covers the outer peripheral surface of the inner rubber 12 formed of a copolymer material of 10 to 50% by weight of silicone rubber and 50 to 90% by weight of ethylene propylene rubber and reinforced with the reinforcing thread 13. Prepare

In the extrusion molding method of the flexible hose of the present invention, the material 12a of the inner rubber 12 made of a copolymer material of 10 to 50% by weight of silicone rubber and 50 to 90% by weight of ethylene propylene rubber is extruded. A step of covering the outer peripheral surface of the mandrel 17, a step of braiding the reinforcing yarn 13 on the outer peripheral surface of the cloth 12a of the inner rubber 12, and a silicone rubber of 10 to 50% by weight and an ethylene propylene rubber of 50 to 90% by weight. Fabric 12a of inner rubber 12 in which reinforcing fabric 13 is knitted by extruding fabric 14a of outer rubber 14 made of a copolymer material
coating the outer peripheral surface of a.

[0007]

[Function] The inner rubber material 12 is made of a copolymer material of silicone rubber and ethylene propylene rubber having excellent heat resistance.
Since the material 14a of the outer rubber 14 and the outer rubber 14 is extruded and molded on the outer peripheral surface of the mandrel 17, it is possible to dispose the hose 11 at a place where the temperature becomes relatively high or to pass a relatively hot fluid through the hose 11. It is possible to reduce the number of manufacturing steps of the hose 11. Further, since the reinforcing thread 13 is knitted during extrusion molding of the material 12a of the inner rubber 12 and the material 14a of the outer rubber 14, the rigidity of the hose 11 becomes strong, and even if positive pressure and negative pressure act repeatedly in the hose 11. I can't collapse.

[0008]

An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the flexible hose 11 includes an inner rubber 12 formed in a pipe shape, a reinforcing thread 13 knitted on the outer peripheral surface of the inner rubber 12, and an inner rubber 12 knitted with the reinforcing thread 13. And an outer rubber 14 that covers the outer peripheral surface of 12. In this example, the inner rubber 12 and the outer rubber 14 are made of a copolymer material of 40% by weight of silicone rubber and 60% by weight of ethylene propylene rubber, and the reinforcing yarn 13 is made of a multifilament yarn of aramid fiber. The reinforcing thread 13 is composed of threads 13a and 13b. This flexible hose 1
As shown in FIGS. 1 and 2, 1 is molded by an extrusion molding device 16 into a pipe shape that covers the peripheral surface of a mandrel 17. The extrusion molding device 16 is erected upright with a predetermined distance and holds a pair of holders 1 for holding both ends of the mandrel 17.
8 and 19, a base 24 that can reciprocate on a rail 23 that extends in a straight line connecting the holders 18 and 19, and an inner rubber extruder 21 that is erected on the base 24.
And an outer rubber extruder 22 and a first annular member rotatably fitted to the outer peripheral surface of the inner rubber extruder 21 via a bearing 26.
The bobbin accommodating portion 31, the annular second bobbin accommodating portion 32 rotatably fitted to the outer peripheral surface of the first bobbin accommodating portion 31 via the bearing 27, and the inner rubber extruder 21 facing the outer rubber extruder 22. And a reinforcing thread guide tool 28 projectingly provided.

The inner rubber extruder 21 has a first die portion 21a having a first through hole 21b into which the mandrel 17 can be loosely inserted.
And a first holding part 21 for holding the first die part 21a.
with c and. A ring-shaped first cavity 21d filled with the material 12a of the inner rubber 12 is formed in the first die portion 21a, and the inner periphery of the first cavity 21d is loosely inserted into the first through hole 21b. It faces the outer peripheral surface of 17 (FIG. 1). A screw conveyor (not shown) is provided in the first holding portion 21c (FIG. 2), and the dough 12a of the inner rubber 12 stored in the hopper (not shown) by this conveyor is the first passage 2
It is pressure-fed to the first cavity 21d of the first die portion 21a via 1e (FIG. 1). The outer rubber extruder 22 is a mandrel 1
Second die part 2 having second through hole 22b into which 7 can be loosely inserted
2a and the 2nd holding | maintenance part 22c which hold | maintains this 2nd die part 22a. The outer rubber 1 is placed in the second die portion 22a.
Ring-shaped second space 22d filled with the dough 14a of No. 4
Is formed, and the inner periphery of the second void 22d faces the outer peripheral surface of the mandrel 17 loosely inserted in the second through hole 22b (FIG. 1). A screw conveyor (not shown) is provided in the second holding portion 22c (FIG. 2), and the dough 14a of the outer rubber 14 stored in the hopper (not shown) by this conveyor passes through the second passage 22e. It is pressure-fed to the second space 22d of the second die portion 22a (FIG. 1).

As shown in detail in FIG. 2, a plurality of first bobbins 3 in which the yarn 13a is wound inside the first bobbin accommodating portion 31.
1a is rotatably housed in the housing 31 at predetermined intervals in the circumferential direction, and the second bobbin housing 32 is provided.
A plurality of second bobbins 32a, around which the thread 13b is wound, are housed in the housing part 32 so as to be rotatable at predetermined intervals in the circumferential direction. A first driven gear 31b is projectingly provided on an end surface opposite to the end surface facing the outer rubber extruder 22 of both end surfaces of the first bobbin accommodating portion 31, and the driven gear 31b is attached to the inner rubber extruder 21 by a bracket. It meshes with the first drive gear 41b fixed to the output shaft 41a of the first motor 41 attached via 29. A second driven gear 32b is provided on the outer peripheral surface of the second bobbin accommodating portion 32, and the driven gear 32b is fixed to the output shaft 42a of the second motor 42 mounted on the base 24.
Mesh with. The first and second bobbin accommodating portions 31 and 32 rotate so that they rotate in opposite directions.
The rotation directions of 1, 42 are set.

A method of manufacturing the flexible hose having the above structure will be described. First, a mold release agent is applied to the outer peripheral surface of the mandrel 17, inserted into the first and second through holes 21b and 22b, and both ends thereof are held by the holders 18 and 19. Base 2
4 is moved to the vicinity of the holder 19 and the thread 13 of the reinforcing thread 13 is
The tips of a and 13b are wound around the mandrel 17 via the reinforcing thread guide 28. At the same time as moving the base 24 toward the holder 18 at a predetermined speed, the first and second holding portions 2
The screw conveyors (not shown) in 1c and 22c and the 1st and 2nd motors 41 and 42 are each driven. The material 12a of the inner rubber 12 is extruded by the inner rubber extruder 21 so as to cover the outer peripheral surface of the mandrel 17, and the first and second bobbin accommodating portions 31 are formed on the outer surface of the material 12a of the extruded inner rubber 12. , 32 rotate in mutually opposite directions, the reinforcing thread 13 is knitted, and the material 14a of the outer rubber 14 is further extruded by the outer rubber extruder 22 and the material 12a of the inner rubber 12 in which the reinforcing thread 13 is knitted. The outer peripheral surface of is covered. When the base 24 moves to the vicinity of the holder 18, the base 24 is stopped and at the same time, the screw conveyor and the first and second motors 41 and 42 in the first and second holding portions 21c and 22c are stopped, respectively, and the mandrel 17 is removed. Remove from holders 18, 19.

Next, a bandage (not shown) is spirally wound to form a fold on the outer peripheral surface of the cloth 14a of the outer rubber 14, vulcanized in this state, and then the bandage is removed. Further, the inner rubber 12 in which the reinforcing thread 13 is woven and covered with the outer rubber 14 is pulled out from the mandrel 17, vulcanized and washed. The flexible hose 11 manufactured in this way has excellent heat resistance,
Since it is stiff, it does not collapse even if positive pressure and negative pressure are repeatedly applied to the hose 11, and although not shown, the intercooler hose connecting the supercharger and the intercooler and the intercooler and the intake manifold has a predetermined length. Used by cutting.

In the above embodiment, the inner rubber and the outer rubber were each made of a copolymer material of 40% by weight of silicone rubber and 60% by weight of ethylene propylene rubber, but the silicone rubber is in the range of 10 to 50% by weight. And ethylene propylene rubber may be in the range of 50 to 90% by weight. The reason why the silicone rubber is limited to the above range is that if it exceeds 50% by weight, the workability is deteriorated, and if it is less than 10% by weight, the heat resistance is deteriorated. Further, the reason why the ethylene propylene rubber is limited to the above range is that if it exceeds 90% by weight, the heat resistance is lowered, and if it is less than 50% by weight, the workability is deteriorated. Further, as long as it is within the above range, a copolymer material in which the weight ratio of the inner rubber to the outer rubber of silicone rubber and ethylene propylene rubber is changed may be used. Further, although the reinforcing yarn is formed of aramid fiber in the above-described examples, it may be formed of polyester, nylon, rayon, vinylon, aramid fiber-based yarn, or a mixed yarn thereof. Further, although the flexible hose is used as the intercooler hose in the above-mentioned embodiment, it is arranged in a place where the surrounding temperature is relatively high, a relatively high temperature fluid is passed through the hose, or the inside of the hose is negative. You may use it for hoses other than the intercooler hose if pressure is applied.

[0014]

As described above, according to the present invention, 1
The inner rubber is formed into a pipe shape with a copolymer material of 0 to 50% by weight of silicone rubber and 50 to 90% by weight of ethylene propylene rubber, and a reinforcing thread is woven into the outer peripheral surface of the inner rubber.
Further, the outer peripheral surface of the inner rubber in which the reinforcing threads are woven is covered with the outer rubber formed of a copolymer material of 10 to 50% by weight of silicone rubber and 50 to 90% by weight of ethylene propylene rubber. Since the flexible hose is formed, it has excellent heat resistance, and it is possible to dispose the hose in the vicinity of an engine having a relatively high temperature or to pass a fluid having a relatively high temperature to the hose. Also, since this hose is strong,
The hose will not collapse even if positive and negative pressures are applied repeatedly. Further, the inner rubber material is extruded to cover the outer peripheral surface of the mandrel, the reinforcing thread is knitted on the outer surface of the inner rubber material, and the outer rubber material is further extruded to reinforce the inner rubber material. Since the outer peripheral surface is covered, the number of manufacturing steps can be reduced and the manufacturing cost can be reduced in the present invention as compared with the conventional method for manufacturing a flexible hose.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a portion A in FIG. 2 showing a state where a flexible hose according to an embodiment of the present invention is manufactured by an extrusion molding apparatus.

FIG. 2 is a sectional front view of a main part of the extrusion molding apparatus.

[Explanation of symbols]

 11 Flexible Hose 12 Inner Rubber 12a Inner Rubber Fabric 14 Outer Rubber 14a Outer Rubber Fabric 17 Mandrel

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B32B 1/08 B 25/10 C08L 83/00 LRQ F16L 11/08 A // B29K 23:00 83 : 00 105: 08 B29L 23:00 (72) Inventor Yuji Otani No. 204, Nonouchi, Ono-cho, Tamura-gun, Fukushima Prefecture Kitanouchi 1 Toa Rubber Chemical Co., Ltd. Fukushima Daiichi Factory

Claims (2)

[Claims] 1. 10 to 50% by weight of silicone rubber and 5
10. An inner rubber (12) formed in a pipe shape from a copolymer material with 0 to 90% by weight of ethylene propylene rubber, and a reinforcing thread (13) knitted on the outer peripheral surface of the inner rubber (12), ~ 50 wt% silicone rubber and 50-90 wt%
A flexible hose provided with an outer rubber (14) which covers the outer peripheral surface of the inner rubber (12) formed of a copolymer material with ethylene propylene rubber and having the reinforcing thread (13) woven therein. 2. 10 to 50% by weight of silicone rubber and 5
A step of extruding a material (12a) of an inner rubber (12) made of a copolymer material with 0 to 90% by weight of ethylene propylene rubber to coat the outer peripheral surface of the mandrel (17), and the material of the inner rubber (12) Step of braiding the reinforcing thread (13) on the outer peripheral surface of (12a), 10 to 50% by weight of silicone rubber and 50 to 90% by weight
The outer peripheral surface of the material (12a) of the inner rubber (12) in which the reinforcing thread (13) is woven by extruding the material (14a) of the outer rubber (14) made of a copolymer material with ethylene propylene rubber. A method of extrusion molding a flexible hose, which comprises a step of coating.