JP2006035749A - Bellows rubber hose and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a bellows rubber hose capable of continuously manufacturing the bellows rubber hose, which has a resin inner pipe, the intermediate rubber layer provided on the outside thereof, a reinforcing layer for imparting pressure resistance and an outer surface rubber layer with high productivity at a low manufacturing cost. <P>SOLUTION: The manufacturing method of the bellows rubber hose 10 includes a process for preliminarily molding the resin inner pipe 16 into a bellows pipe and a continuous long pipe 10A, a process for continuously coating the outer peripheral surface of the resin inner pipe 16 with an intermediate rubber layer 18 in a bellows shape using the resin inner pipe 16 as a core to mold a long pipe 10B, a process for continuously braiding reinforcing yarns on the outer peripheral surface of the long pipe 10B to mold a long pipe 10C having a bellows-shaped reinforcing layer 20, a process for continuously forming an outer surface rubber layer 22 on the outer peripheral surface of the long pipe 10C to mold a long pipe 10D and a cutting process for continuously vulcanizing the long pipe 10D and automatically cutting the vulcanized pipe into individual bellows rubber hoses 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a bellows rubber hose suitable for automobile piping and the like, and a bellows rubber hose.

Conventionally, hoses mainly composed of a rubber layer have been widely used as piping hoses for automobiles.
The main purpose of using such a hose is to absorb vibrations.
For example, in the case of a piping hose disposed in the engine room of an automobile, the engine vibration, the compressor vibration of an air conditioner (in the case of a refrigerant transport hose, that is, an air conditioner hose), and various vibrations generated as the vehicle travels It absorbs at a portion and plays a role of suppressing vibration from being transmitted from one member connected through a hose to the other member.

For this purpose, i.e. in order to ensure good vibration absorption, these piping hoses require a certain length.
Especially in the case of high pressure hoses such as oil systems (for example, power steering hoses) and refrigerant systems (refrigerant transport hoses) compared to low pressure hoses such as fuel systems and water systems, vibration absorption, vehicle interior The required length to reduce the propagation of sound and vibration to the
For example, in the case of a refrigerant transport hose, even if the length of a straight line that must be connected is 200 mm, vibration absorption and propagation of sound and vibration are generally reduced by using a hose having a length of 300 to 600 mm. It is carried out.

  However, various devices and parts are incorporated in the engine room so narrowly. Especially in recent years, the engine room has become increasingly compact, and the hose disposed there If the length is long, the shape of the hose must be a complicated bent shape to avoid interference with others.

As a method for manufacturing such a bent hose (bent hose), a manufacturing method using a bending die as shown in FIGS. 16 and 17 has been conventionally performed.
In the manufacturing method shown in the figure, an unvulcanized rubber material is continuously extruded from a long extruder, and then first semi-vulcanized to such an extent that the appearance is not damaged, and then the semi-vulcanized state. The long rubber hose 200A is cut at a predetermined size as shown in FIG. 16 (I) to form one rubber hose 200a.

Thereafter, as shown in FIG. 16 (II), a flexible mandrel (core body) 202 having an insertion allowance is inserted in each rubber hose 200a in each semi-vulcanized state to suppress flatness. Then, as shown in FIG. 16 (III), each rubber hose 200a in a semi-vulcanized state with the mandrel 202 inserted is inserted into the bent and grooved recess 206 of the outer frame mold 204. The whole 202 is fitted while being bent (see FIG. 17 (IV)).
Then, as shown in FIG. 17 (V), the rubber hose 200a together with the outer frame mold 204 is placed in the secondary vulcanizing furnace 208, where it is heated for a predetermined time to perform vulcanization.

Then, after the rubber hose 200 after vulcanization is taken out from the secondary vulcanization furnace 208 together with the outer frame mold 204, the rubber hose 200 is removed from the outer frame mold 204 together with the mandrel 202 as shown in FIG. Further, the mandrel 202 is extracted from the rubber hose 200.
Here, the intended curved rubber hose 200 is obtained.

  However, in this manufacturing method, the mandrel 202 is inserted into the semi-vulcanized rubber hose 200a, the mandrel 202 is fitted into the outer frame mold 204, the vulcanized rubber hose 200 is removed from the outer frame mold 204, and An operator must manually perform the operation of extracting the mandrel 202 and other operations, which cannot be performed continuously, have low productivity, and inevitably have a very high manufacturing cost.

FIG. 18 (a) shows a method of manufacturing a bent rubber hose disclosed in Patent Document 1 below, where a tubular bending die 210 is used and an unvulcanized straight tubular tube extruded from an extruder 212 is shown. The rubber hose 200a is inserted into the bending die 210 until its tip contacts the limit switch 214, and then cut with a cutter 216, and the rubber hose 200a is put together with the bending die 210 into a vulcanizing furnace for a predetermined time. To heat and vulcanize.
However, in this manufacturing method as well, various operations such as manually pulling out the vulcanized rubber hose from the bending mold 210 must be manual operations, and as with the above manufacturing method, continuous production is difficult and productivity is difficult. The manufacturing cost is high.

For this reason, there is a demand for the development of a hose that can absorb vibrations satisfactorily even if the hose shape is linear and short.
As a means for shortening the length of the hose while ensuring vibration absorption in the hose, it is conceivable to make the hose into a bellows shape.
If the hose has such a bellows shape, even if it is formed into a linear shape, it can be piped in a bent state using its flexibility, and it has excellent flexibility. Therefore, good vibration absorbability can be secured.

Conventionally, an example of a method for manufacturing this kind of bellows-shaped rubber hose is disclosed in the following Patent Document 2, Patent Document 3, and the like.
FIG. 18 (b) shows the manufacturing method disclosed in Patent Document 2. Here, a mandrel type 218 having an outer peripheral shape of a bellows shape is used, and an unvulcanized rubber hose 200a is used as the mandrel type 218. The space between the rubber hose 200a and the mandrel mold 218 is vacuum-sucked through the suction hole 220 of the hollow mandrel mold 218, and the rubber hose 200a is brought into close contact with the outer peripheral surface of the mandrel mold 218 by the vacuum suction force. Vulcanization treatment is performed to make the shape after vulcanization into a bellows shape.

FIG. 19 (a) shows the manufacturing method disclosed in Patent Document 3, in which an outer frame die 222 having a circular cross section and an inner peripheral surface formed in a bellows shape is used as a molding die, and a straight tube is formed therein. The unvulcanized rubber hose 200a is inserted, and the sealing plugs 224 and 226 are fitted to both ends, and then air is blown from the blowing hole 228 of the sealing plug 226, and the rubber hose 200a is attached to the outer frame mold 222 by the pressure of the air. In this state, the rubber hose after vulcanization having a bellows shape is obtained.
However, these manufacturing methods shown in FIGS. 18 (b) and 19 (a) are also processed into a predetermined bellows shape using a molding die (mandrel die 218, outer frame die 222) corresponding to each rubber hose 200a. This is a vulcanization process, and must be done manually, and has problems such as difficulty in continuous production, poor productivity, and high production costs.

  By the way, rubber hoses used as automobile hose and the like, such as a refrigerant transport hose, are highly required to have internal fluid impermeability in addition to vibration absorption. Although an inner resin tube is laminated as an inner surface layer, the above-described manufacturing methods disclosed in Patent Documents 2 and 3 merely disclose a method of manufacturing a bellows rubber hose made of a single rubber. However, it does not disclose a method of manufacturing a composite hose having such a resin inner pipe.

Further, for example, a refrigerant transport hose is required to have pressure resistance in addition to vibration absorption and internal fluid impermeability. For such a hose that requires pressure resistance, a reinforcing wire is usually used. A braided reinforcing layer is provided, but when such a reinforcing layer is provided in a bellows rubber hose, it is required to form such a reinforcing layer in a bellows shape.
If the reinforcing layer does not have a corrugated cross-section that accurately follows the bellows shape and the reinforcing layer floats from the bellows-shaped valley, the reinforcing effect of the reinforcing layer is uniform over the entire length of the hose. This causes a problem that a part having a low strength is partially generated and breakage occurs.

In addition, if the reinforcing layer is braided in a low tension state, yarn disturbance will be induced, leading to deterioration of pressure resistance. Usually, the braid is applied with tension to a level that does not cause yarn disturbance. However, the inside of the hose is hollow, and there is a risk that the hose may be crushed during braiding if there is no core inside.
None of the above-mentioned patent documents shows a solution to such a problem.

The manufacturing methods disclosed in Patent Document 2 and Patent Document 3 use a molding die for bellows-shaped molding such as a mandrel and an outer frame mold for each rubber hose, and therefore a reinforcing layer is provided on the bellows rubber hose. The provision itself is difficult.
Furthermore, when manufacturing a bellows rubber hose having such a reinforcing layer, it is required that each bellows rubber hose can be continuously produced, and can be manufactured with high productivity and at low cost. Does not show the solution.

The manufacturing method of the bellows rubber hose having the reinforcing layer is also disclosed in Patent Document 4 below.
FIG. 19 (b) shows this.
In this manufacturing method, when a rubber hose having an inner rubber layer 230, a reinforcing layer 232, and an outer rubber layer 234 is manufactured, it is first formed into a straight tube in an unvulcanized state, and then the straight tube is not added. After inserting the mandrel mold 236 whose outer peripheral shape is bellows shape into the rubber hose 200a in the sulfurized state, the rubber hose 200a is fastened with the string-like body 238 from the outer peripheral surface so as to conform to the outer bellows shape of the mandrel mold 236. In this state, vulcanization is performed to obtain a rubber hose after vulcanization having a bellows shape.

  However, in this manufacturing method, it is necessary to tighten the string-like body 238 for each bellows-shaped trough, and to deform the unvulcanized straight tubular rubber hose 200a for each trough, and the rubber hose 200a1. A bellows-shaped rubber hose is manufactured by using a mandrel type 236 corresponding to each book, and it is unavoidable due to manual work, and continuous production is difficult. Therefore, productivity is low and manufacturing cost is low. Will also be expensive.

  Moreover, if the bellows-shaped rubber hose having the reinforcing layer 232 is manufactured in a continuous long tube by this manufacturing method and is cut into individual rubber hoses, the mold release at that time can be performed satisfactorily. In fact, in the method disclosed in Patent Document 4, it is difficult to continuously produce a bellows-shaped rubber hose having such a reinforcing layer 232.

Further, in the manufacturing method disclosed in Patent Document 4, first, the rubber hose 200a is formed into a straight tube shape, and then tightened in a string state 238 to form an unvulcanized straight tube rubber hose 200a together with the reinforcing layer 232 in a bellows shape. Therefore, the problem is that the arrangement of the reinforcing wires in the reinforcing layer 232 is disturbed at that time, so that a sufficient reinforcing effect cannot be exhibited.
Furthermore, this manufacturing method does not disclose a method for manufacturing a composite bellows rubber hose having a resin inner tube.

JP 53-126083 A JP 59-199235 A Japanese Patent Laid-Open No. 7-9542 JP-A-57-204386

The present invention is based on the above circumstances, and can continuously manufacture a bellows rubber hose having a resin inner tube and a rubber layer on the outer peripheral side thereof, and has high productivity and low manufacturing cost. It is made for the purpose of providing the manufacturing method of the bellows rubber hose to obtain.
Another object of the present invention is to continuously manufacture a bellows-shaped rubber hose having a reinforcing layer for giving pressure resistance to the rubber hose together with the resin inner tube, and to reduce the manufacturing cost with high productivity. Another object of the present invention is to provide a method of manufacturing a bellows rubber hose having a reinforcing layer and a bellows rubber hose.

  Thus, claim 1 relates to a method of manufacturing a bellows rubber hose, which includes a resin inner tube forming a bellows tube, and a bellows-shaped outer peripheral rubber having a corrugated cross section following the bellows shape of the resin inner tube. A bellows rubber hose having a layer comprising: (a) a resin inner tube forming step in which the resin inner tube is previously formed into a bellows tube; and (b) the resin inner tube as a core, A rubber material is formed in a cylindrical shape on the outer peripheral surface and extruded from an extruder along the bellows shape, and the rubber layer is formed into a bellows shape having a corrugated cross-section that follows the bellows shape of the inner tube of the resin over the entire length. A rubber layer forming step, and (c) a subsequent vulcanization step.

  The manufacturing method of Claim 2 is the rubber material extruded in Claim 1 by vacuum-sucking between the rubber material extruded from the said extruder into a cylinder shape, and the said resin inner pipe | tube of the inner peripheral side. The rubber layer is molded into a bellows shape having a corrugated cross-section following the bellows shape of the resin inner tube.

  According to a third aspect of the present invention, there is provided the manufacturing method according to any one of the first and second aspects, wherein the resin inner tube forming step is performed by continuously corrugating a straight resin pipe that has been continuously extruded from an extruder with a corrugating machine. The rubber layer is formed into a tube, and the rubber layer is formed by continuously extruding the rubber material to the outer peripheral side of the long resin inner tube that is continuously fed thereafter. And the manufacturing method further includes a cutting step of cutting a long vulcanized product into individual hoses each having a predetermined length after the vulcanizing step. To do.

  The manufacturing method according to claim 4 is the method according to claim 3, wherein in the vulcanization step, the unvulcanized long tube is continuously passed through a vulcanizing furnace and the long tube is continuously vulcanized. Features.

  The manufacturing method according to claim 5 is the method according to any one of claims 3 and 4, wherein the cutting step detects, with a sensor, the passage of a specific part of the long pipe after vulcanization that is continuously sent. From the detection of the passage of the specific part, the long tube is automatically and continuously cut into the individual hoses one after another by a cutter at the position where the long tube is sent by a set distance.

  The manufacturing method according to claim 6 is the method according to any one of claims 3 and 4, wherein the bellows rubber hose is formed by braiding a reinforcing wire on the outer peripheral side of the resin inner tube and follows a corrugated shape following the bellows shape of the resin inner tube. The reinforcing layer is formed by the step of forming the reinforcing layer in the form of a corrugated cross section along the bellows-shaped peaks and valleys of the resin inner tube with the resin inner tube as a core. The reinforcing layer is continuously formed in a bellows shape having a corrugated cross-section following the bellows shape of the resin inner tube, and the cutting step includes the vulcanized product together with the reinforcing layer. It is characterized by cutting.

  A manufacturing method according to a seventh aspect is the method according to the sixth aspect, wherein the molding step of the resin inner tube, the molding step of the rubber layer, the formation step of the reinforcing layer, and the vulcanization step are substantially linear on a continuous production line. It is characterized by being arranged.

  The manufacturing method according to claim 8 is the manufacturing method according to any one of claims 6 and 7, wherein the bellows rubber hose has an intermediate rubber layer and an outer rubber layer as the rubber layer on the outer peripheral side of the resin inner tube. The reinforcing layer is provided between the rubber layer and the outer rubber layer, and the molding step of the rubber layer includes the molding step of the intermediate rubber layer and the molding step of the outer rubber layer, The rubber layer molding step comprises continuously extruding the rubber material for the intermediate rubber layer along the bellows-shaped ridges and troughs of the resin inner tube on the outer peripheral side of the resin inner tube as a core body, The intermediate rubber layer is continuously molded into a bellows shape having a corrugated cross-section following the bellows shape of the resin inner tube, and the outer rubber layer molding step includes the bellows shape of the resin inner tube as a core. A rubber material for the outer rubber layer is continuously extruded along the crest and trough, and the outer surface Characterized in that the beam layer is to continuously mold the bellows forming the cross-sectional wave shape follows the bellows of the resin within the tube.

  A manufacturing method according to a ninth aspect is characterized in that, in any one of the sixth to eighth aspects, a heat-shrinkable reinforcing wire is used as the reinforcing wire.

  Claim 10 relates to a bellows rubber hose, a resin inner tube forming a bellows tube formed by molding, a bellows-shaped outer peripheral rubber layer following the bellows shape of the resin inner tube, and the intermediate rubber layer A reinforcing layer formed by braiding the bellows-shaped reinforcing wire following the bellows shape on the outer peripheral side of the outer peripheral side, and a bellows-shaped outer rubber layer following the bellows shape on the outer peripheral side of the reinforcing layer. It is characterized by that.

  According to an eleventh aspect of the present invention, in the tenth aspect, the resin inner pipe has a strength and a thickness that does not deform even when the reinforcing wire is braided in a tensioned state on the outer peripheral side of the resin inner pipe. It is characterized by that.

Effects and effects of the invention

  As described above, in the present invention, when manufacturing a bellows rubber hose having a resin inner tube forming a bellows tube and a bellows-shaped rubber layer on the outer periphery thereof, the resin inner tube is first formed into a bellows tube in advance. After that, the resin inner tube that becomes a part of the product is used as a core, and the rubber material is extruded from the extruder along the bellows shape of the resin inner tube that works as a core and the outer peripheral surface of the resin. A rubber layer is molded into a bellows shape having a corrugated cross section that follows the bellows shape of the inner tube over its entire length, and then vulcanization is performed.

In the manufacturing method of the present invention, even if a mandrel separate from the product is not used as in the conventional manufacturing method, or an outer frame type or a string-like body for giving a bellows shape is not used, A rubber hose having a resin inner tube can be formed into a bellows shape.
In addition, since it is not necessary to use a mandrel, outer frame mold or string-like body, and the mold removal operation is not required, continuous production and automation of a bellows rubber hose having a resin inner pipe and a rubber layer are realized. Is possible.

In this case, when the rubber layer is formed on the outer peripheral side of the resin inner tube made of a pre-formed bellows tube, a vacuum is sucked between the rubber material extruded in a cylindrical shape from the extruder and the resin inner tube on the inner peripheral side. Based on the vacuum suction force, the rubber material is brought into close contact with the bellows-shaped peaks and valleys of the resin inner tube, and the rubber layer is formed into a bellows shape having a corrugated cross-section following the bellows shape of the resin inner tube. (Claim 2).
By doing in this way, the rubber layer can be easily formed into a bellows shape having a corrugated cross section following the bellows shape of the resin inner tube, and the molding operation can be automated without relying on manual work. It becomes possible.

Next, according to a third aspect of the present invention, a straight resin pipe continuously extruded from a long extruder is formed into a bellows pipe continuously by a corrugating machine, and thereafter a rubber material is formed on the outer peripheral side of the long resin inner pipe. Are continuously extruded to form a bellows-shaped rubber layer, and the long tube after vulcanization is cut into individual hoses each having a predetermined length. According to this manufacturing method, the bellows-shaped resin It becomes possible to continuously manufacture the bellows rubber hose including the inner pipe and the rubber layer on the outer peripheral side thereof.
This manufacturing method has an advantage that even different types of bellows rubber hoses having different sizes and bellows shapes can be easily and continuously manufactured in a mixed flow state.

In this case, the vulcanization step can be performed by continuously passing an unvulcanized long pipe through a vulcanizing furnace (claim 4).
In this way, the vulcanization process itself can be performed continuously and automatically.

According to claim 5, the above-described cutting process itself is also performed by continuously cutting the vulcanized long pipe every predetermined length while continuously feeding the long pipe. The production of the bellows rubber hose including such a cutting process can be made continuous and automated.
In this case, the sensor detects the passage of the specific part of the long pipe after vulcanization sent continuously, and the cutter is moved at the position where the long pipe has been sent a set distance from the detection of the passage of the specific part. By doing so, it is possible to automatically cut each hose one after another continuously.

In this case, the first peak or valley of the bellows-shaped portion can be detected as a specific portion from the straight shape portion of the bellows rubber hose in the long tube. By doing in this way, the specific site | part of a hose can be detected easily and accurately.
Furthermore, in this case, the first peak or valley can be made into a special shape different from the other peaks or valleys of the bellows-shaped part. In this case, the specific part can be detected more easily and with high accuracy.

  Next, when manufacturing the bellows rubber hose having the reinforcing layer formed by braiding the reinforcing wire, the sixth aspect of the present invention uses the resin inner tube as a core body and the reinforcing wire along the bellows-shaped peaks and valleys of the resin inner tube. Then, the reinforcing layer is continuously formed in a bellows shape following the bellows shape of the resin inner tube.

For example, when a reinforcing wire is braided with a predetermined tension on the outer peripheral surface of a accordion-shaped unvulcanized rubber layer, the shape of the accordion-shaped rubber layer is broken by the tension of the reinforcing wire.
On the other hand, when the reinforcing wire is braided with a remarkably small tension to prevent this, the reinforcing wire cannot be braided along the bellows-shaped peaks and valleys.

However, in this manufacturing method, since the reinforcing inner wire is braided using the resin inner tube that has been previously formed into the bellows tube as a core, that is, instead of the mandrel, the reinforcing wire is braided with a sufficiently large tension. As a result, the reinforcing wire can be braided along the bellows-shaped peaks and valleys, and the reinforcing layer follows the bellows shape of the resin inner tube. It becomes possible to form in the shape of the bellows.
In this manufacturing method, the reinforcing wire is not braided for each hose to form a reinforcing layer, but the reinforcing wire is braided for a long extruded product that is continuously fed. Therefore, the reinforcing layer can be formed easily and continuously.

  In this case, the resin inner tube forming process, the rubber layer forming process, the reinforcing layer forming process by braiding the reinforcing wire, and the vulcanizing process should be aligned substantially linearly along the continuous production line. (Claim 7).

Next, according to an eighth aspect of the present invention, when the bellows rubber hose having the intermediate rubber layer and the outer rubber layer as the rubber layer and having the reinforcing layer therebetween is manufactured, the outer peripheral side of the resin inner tube forming the bellows tube First, the intermediate rubber layer is formed into an accordion shape, and then the reinforcing layer is formed into an accordion shape, and then the outer rubber layer is also formed into an accordion shape, and each is formed into an accordion shape using the resin inner tube as a core body. To do.
In this manufacturing method, the inner rubber layer, the reinforcing layer, and the outer rubber layer can all be formed in a bellows shape and continuously by using the resin inner tube as a core.

  In addition, when the reinforcing wire is braided on the outer peripheral side of the intermediate rubber layer to form the reinforcing layer into a bellows shape, the resin inner tube serves as a core, so even if the reinforcing wire is braided with a large tension, the intermediate rubber The layer does not collapse in shape, and the reinforcing wire can be braided well along the bellows-shaped peaks and valleys of the intermediate rubber layer.

Since the reinforcing layer can be satisfactorily formed into a bellows shape in the manufacturing methods of claims 6 to 8, the reinforcing effect of the reinforcing layer can be uniformly applied over the entire length of the bellows rubber hose, and the pressure resistance and strength of the bellows rubber hose can be increased. Can be effectively increased.
Moreover, peeling from the periphery of the reinforcing layer itself can be prevented, and the durability of the bellows rubber hose can be enhanced.

In these cases, a heat-shrinkable material can be used as the reinforcing wire (claim 9).
When such a heat-shrinkable material is used as the reinforcing wire, the valley shape of the reinforcing layer is formed by contracting the reinforcing wire by heating during vulcanization, particularly in the bellows-shaped valley, and the bellows shape in the resin inner pipe It can be made to follow the shape of the trough part and adhere more closely.
That is, when the reinforcing layer is formed by braiding, even if the reinforcing layer is slightly lifted in the valley, the reinforcing layer is thermally contracted during vulcanization, and the reinforcing wire is further submerged in the bellows-shaped valley. It can be made to adhere more closely and can also improve adhesive force.

Here, as the heat-shrinkable reinforcing wire, for example, one having a heat shrinkage rate of 5% or more at the time of heating (at the time of vulcanization) can be suitably used.
Examples of such a material include polyester and PA (polyamide) 66.

  Next, claim 10 relates to a bellows rubber hose, which comprises a resin inner tube forming a bellows tube, a bellows-shaped outer peripheral rubber layer following the bellows shape of the resin inner tube, and an outer periphery thereof. A bellows-shaped reinforcing layer on the side and a bellows-shaped outer rubber layer on the outer peripheral side of the reinforcing layer. In the case of this bellows rubber hose, the resin inner tube gives good permeation resistance to the transport fluid. In addition, the reinforcing layer can provide a large pressure resistance, and since it has a bellows shape as a whole, it can provide flexibility and therefore good vibration absorption performance.

  In this case, the resin inner pipe can have a strength and a thickness that do not deform even if the reinforcing wire is braided with tension applied to the outer periphery thereof (claim 11).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2, reference numeral 10 denotes a bellows rubber hose used as, for example, a refrigerant transport hose (air conditioner hose). The bellows-shaped portion 10-1 which is almost the whole and straight tubular straight-shaped portions 10- at both ends. 2.
The bellows rubber hose 10 has a resin inner tube 16 as an innermost layer, an intermediate rubber layer 18 on the outer peripheral side thereof, a reinforcing layer 20 formed by braiding a reinforcing yarn 58 (see FIG. 9) as a reinforcing wire, and a cover rubber layer. The outer rubber layer 22 is sequentially laminated.

Here, the resin inner tube 16, the intermediate rubber layer 18, the reinforcing layer 20, and the outer rubber layer 22 all have a bellows shape corresponding to the bellows shape portion 10-1, as shown in FIG. Further, the portions corresponding to the straight-shaped portions 10-2 at both ends are straight pipes.
That is, all of the resin inner tube 16, the intermediate rubber layer 18, the reinforcing layer 20, and the outer rubber layer 22 are substantially accordion-shaped portions 16-1, 18-1, 20-1, 22-1, and both ends. Each has a straight-shaped portion 16-2, 18-2, 20-2, 22-2.
Here, each of the bellows-shaped portions 18-1, 20-1, and 22-1 of the intermediate rubber layer 18, the reinforcing layer 20, and the outer rubber layer 22 has a cross-sectional wave shape following the bellows-shaped portion 16-1 of the resin inner tube 16. It has a bellows shape.

  In the present embodiment, the bellows rubber hose 10 cuts a long tube 10D (after vulcanization) in which the bellows rubber hose 10 is continuously formed in the longitudinal direction as shown in FIG. It was obtained.

  In the present embodiment, the bellows rubber hose 10 has an inner diameter of about 5 to 50 mm, and the resin inner tube 16 has a thickness of about 0.2 mm, preferably about 0.15 mm, and the intermediate rubber layer 18, The outer rubber layer 22 has a thickness of about 2 mm and 1 mm, respectively.

  Regarding the material, polyamide resin is used for the resin inner tube 16 here, but other resins such as polymethylpentene can be used.

  On the other hand, as the intermediate rubber layer 18, IIR, halogenated-IIR (Cl-IIR, Br-IIR), NBR, CR, EPDM, EPM, FKM, ECO, silicone rubber, urethane rubber, acrylic rubber, or the like can be used. .

  The reinforcing yarn 58 constituting the reinforcing layer 20 is preferably a polyester or polyamide type having heat shrinkability.

  Further, various rubber materials enumerated in the intermediate rubber layer 18 can be used as the outer rubber layer 22, but other than that, a heat-shrinkable tube or a thermoplastic elastomer (TPE) called elastomer rubber can be used. Possible materials include acrylic, styrene, olefin, diolefin, vinyl chloride, urethane, ester, amide, and fluorine.

The intermediate rubber layer 18 can be used by selecting an appropriate material according to the fluid flowing through the inside.
However, in the case of an HFC refrigerant transport hose, an IIR or halogenated-IIR single material or a blend material is particularly preferable.
The same applies to the outer rubber layer 22.

Next, the manufacturing method of the bellows rubber hose 10 of this embodiment is demonstrated in detail below based on FIGS.
First, in FIG. 3, 24 is a resin material extruder, and the resin material is continuously extruded from the nozzle 26 in a straight tube shape.
In FIG. 7, 26A and 26B are the outer and inner of the nozzle 26, and the resin material is pushed forward (to the right in FIG. 7) through an annular passage between the outer 26A and the inner 26B.

Thus, the resin straight tube continuously extruded from the extruder 24 is continuously converted into a bellows tube in synchronism with the extrusion from the extruder 24 by the corrugating machine 28 shown in FIG. It will be molded.
That is, the resin inner tube 16 shown in FIG. 5 (I) is continuously formed. In FIG. 5I, 10A represents a long tube in which the resin inner tube 16 is continuous in the longitudinal direction.
As shown in FIG. 5 (I), each resin inner tube 16 is formed into a shape having a bellows-shaped portion 16-1 and a straight tubular straight-shaped portion 16-2 at both ends. 28.

FIGS. 6 and 7 show a corrugating machine 28, which has a pair of left and right (upper and lower in FIG. 6) circulation molds 30. FIG.
A plurality of molding blocks 32 are arranged in a ring shape in the groove portion of the corrugating machine 28.
The molding block 32 is provided with a gear portion 34, which is sequentially sent out by a drive unit formed on the molding line, and continuously circulates in the direction indicated by the arrow in FIG.

Each molding block 32 has a semicircular inner shape in cross section, and in the state where a pair of left and right (upper and lower) molding blocks 32 are combined, a molding inner surface having a circular cross section is formed inside them.
The molding inner surfaces of these molding blocks 32 have shapes corresponding to the bellows-shaped portion 16-1 and the straight-shaped portion 16-2.

As shown in FIG. 7, each molding block 32 is provided with a number of suction holes 36, and through these suction holes 36, a space surrounded by the molding inner surface of the molding block 32, specifically, the space is inserted. The space between the straight resin pipe and the molding inner surface is vacuumed.
Then, the straight pipe of the resin is forcibly brought into close contact with the molding inner surface of the molding block 32 by the vacuum suction force, and is molded into a shape corresponding to the molding inner surface of the molding block 32. That is, the bellows-shaped portion 16-1 and the straight-shaped portion 16-2 are formed.
At this time, air may be blown out through the hole 40 of the pipe 38.

  As shown in FIG. 3, the long tube 10A of the resin inner tube 16 exiting from the corrugating machine 28 is subsequently passed through an extruder 42, where the outer peripheral surface of the long tube 10A, that is, the inside of each resin. An intermediate rubber layer 18 is extruded on the outer peripheral surface of the tube 16 in a laminated state.

As shown in FIG. 8, the extruder 42 continuously removes the rubber material from the die 44 as the long pipe 10 </ b> A in which the resin inner pipes 16 are continuously connected in the longitudinal direction progresses to the right in the drawing. The tube 10A is continuously extruded so as to cover the outer peripheral surface of the tube 10A.
In this case, if the rubber material is simply extruded into a cylindrical shape, the extruded rubber material has a straight tubular cylindrical shape, and the bellows-shaped portion 16-in the extruded rubber cylindrical body and the resin inner tube 16. A gap is generated between the first trough and the first trough.

Therefore, in this embodiment, a trumpet-like cylindrical body 46 is provided, and the inner space 48 is vacuum-sucked.
As a result, the rubber material of the intermediate rubber layer 18 extruded in a cylindrical shape from the die 44 adheres along the crests and troughs of the bellows-shaped part 16-1 in the resin inner tube 16 by the vacuum suction force, It is formed into a bellows shape having a corrugated cross section following the bellows shape portion 16-1 of the resin inner tube 16.
Of course, the straight shape portion 16-2 of the resin inner tube 16 is in close contact with the outer peripheral surface thereof, and is formed into a straight tube having a corresponding shape.

In this embodiment, since the intermediate rubber layer 18 is formed on the outer peripheral surface of the resin inner tube 16, that is, the long tube 10 </ b> A continuously connecting the resin inner tube 16, the intermediate rubber layer 18 is satisfactorily formed. It can be formed into a bellows shape.
In FIG. 8, 18 is an intermediate rubber layer formed along the outer peripheral surface of the resin inner tube 16, 18-1 is a bellows-shaped portion in the intermediate rubber layer 18, and 18-2 is a straight-shaped portion. Represents each.
In FIG. 8, 50 is a take-up machine.

It should be noted that plasma treatment may be performed on the outer peripheral surface of the resin inner tube 16 in advance to further improve the adhesion between the resin inner tube 16 and the intermediate rubber layer 18.
8B shown in FIG. 8 and FIG. 5 (II) represents the long tube after the intermediate rubber layer 18 is coated on the outer peripheral surface of the long tube 10A. .

  The long tube 10B after the intermediate rubber layer 18 is covered and molded as described above is subsequently passed through the braiding machine 52 as shown in FIG. The reinforcing yarn 58 is continuously braided, and the reinforcing layer 20 formed by braiding the reinforcing yarn 58 on the outer peripheral surface of the long tube 10B is continuously formed along the longitudinal direction.

9 to 12 show the main part of the braiding machine 52 and the braiding method.
As shown in FIG. 9, the braiding machine 52 has a disk-shaped deck plate 54, and further has a plurality of pairs of carriers 56A and 56B which are paired with each other along the circumference, and are paired with each other. The reinforcing yarn 58 is braided on the outer peripheral surface of the intermediate rubber layer 18 by the circular motion of the carriers 56 </ b> A and 56 </ b> B around the center of the deck plate 54 while crossing and moving in the shape of eight.

In FIG. 9, reference numeral 60 denotes a disk for rotating the pair of carriers 56A and 56B around the center of the deck plate 54 while crossing each other in the shape of a figure 8, and as shown in FIG. A large number of disks 60 are provided on a circumference around the center of 54.
These disks 60 are provided with a U-shaped notch 62 on the outer peripheral portion (see FIG. 11B), and the carriers 56A and 56B are moved from one disk 60 as the disk 60 rotates in the same direction. They are transferred to other adjacent discs 60 at the notches 62.

Here, the carriers 56 </ b> A and 56 </ b> B are transferred from the one disk 60 to the disk 60 provided on the opposite side to each other, and each revolves around the center of the deck plate 54 in the opposite directions.
As a result, the carriers 56A and 56B make a reciprocating motion around the center of the deck plate 54 while crossing and moving in the shape of an eight.

As shown in FIG. 10, each disk 60 is provided with a driven gear 66 in a state of rotating integrally with the corresponding disk 60.
Further, as shown in the figure, adjacent gears 66 are meshed with each other.
A drive gear 68 is engaged with any one of the driven gears 66, and the drive gear 68 is rotationally driven by a drive motor 70.
That is, when the drive gear 68 is rotationally driven by the drive motor 70, the driven gears 66, and hence the disks 60, are simultaneously rotated.
9, 10, and 11, reference numeral 64 represents a guide ring for the reinforcing yarn 58.

In the present embodiment, as shown in FIG. 9, the long tube 10 </ b> B after the intermediate rubber layer 18 is extruded is passed through the braiding machine 52, and the reinforcing yarn 58 is placed in the longitudinal direction on the outer peripheral surface of the intermediate rubber layer 18. We will continue to braid along.
In FIG. 9, 10C represents the long tube after the reinforcing layer 20 is formed on the outer peripheral surface of the intermediate rubber layer 18 in this way.

  In the step of forming the reinforcing layer 20, when the long tube 10 </ b> B does not have the resin inner tube 16 therein, that is, only the rubber layer, the reinforcing yarn 58 is tensioned so as not to disturb the yarn. When braided over, the shape of the rubber layer collapses due to the braiding of the reinforcing yarn 58, and the braiding cannot be performed satisfactorily.

However, in the present embodiment, since the long tube 10B has the hard resin inner tube 16 inside, the resin inner tube 16 is used as a core body, that is, instead of the mandrel, so that the outer circumference of the long tube 10B can be satisfactorily obtained. The reinforcing yarn 58 can be braided on the surface with a tension that does not cause yarn disturbance.
Therefore, in the bellows-shaped portion 18-1 as well as the straight-shaped portion 18-2 of the long tube 10B, the reinforcing thread 58 is good along the peaks and valleys of the bellows-shaped portion 16-1 in the resin inner tube 16. The reinforcing layer 20 can be satisfactorily formed into a bellows shape (bellows shape portion 20-1) following the bellows shape portion 16-1 of the resin inner tube 16. .

Further, in this embodiment, when braiding the bellows-shaped portion 18-1 in the long tube 10B in order to further improve the adhesion, the rotational speeds of the carriers 56A and 56B are higher than when braiding the straight-shaped portion 18-2. (Feeding speed is constant).
As a result, the reinforcing yarn 58 can be lowered by the valley portion of the bellows-shaped portion 18-1, so that the adhesion is improved and the reinforcing layer 20 can be formed satisfactorily.

Therefore, in this embodiment, as shown in FIG. 10A, the driving of the take-up machine 50 of the long tube 10C and the driving of the carriers 56A and 56B in the braiding machine 52 are separately driven, and these are transferred to the control unit 72. Control automatically.
Specifically, as shown in FIG. 12, when the bellows-shaped portion 18-1 of the long tube 10B reaches the braided point P, the rotational speed of the carriers 56A and 56B is increased, and the bellows-shaped portion 18- When the straight shape portion 18-2 following 1 reaches the braiding point P, the rotational speed of the carriers 56A and 56B is returned to the normal rotational speed.

The specific control is performed as follows.
That is, after the sensor 74 provided at a fixed position along the traveling path of the long tube 10B detects the passage of the first peak portion of the bellows-shaped portion 18-1, as shown in FIG. When the long tube 10B is forwardly fed by a distance L from the braiding point P, the rotational speed of the drive motor 70 (see FIG. 10) is increased to increase the rotational speed of the carriers 56A and 56B, and the braiding of the reinforcing yarn 58 is performed. Increase density and braid pitch.
Here, the feed of the distance L can be detected based on the feed amount detected by the encoder 76 provided in the take-up machine 50.

On the other hand, as shown in FIG. 12B, when the sensor 74 detects the straight-shaped portion 18-2, after that, when the long tube 10B is fed forward by LL2, the rotational speed of the carriers 56A, 56B is set to the normal speed. return.
As a result, the braid density and the braid pitch are changed to the normal density and pitch when the straight shape portion 18-2 reaches the braid point P.
Here, L2 is set because the sensor 74 does not detect the peak portion over a certain distance (L2 in the figure) in order to accurately detect the straight shape portion 18-2 by the sensor 74. This is because it can be recognized for the first time that the straight-shaped portion 18-2 has arrived.

In the present embodiment, the reinforcing yarn 58 can be braided into a corrugated cross section, that is, a bellows shape along the peak and valley portions of the bellows-shaped portion 18-1 of the long tube 10B as described above. There may be a case in which the reinforcing layer 20 is not braided so as to be in close contact with the bottom of the valley portion of the bellows-shaped portion 16-1 in the resin inner tube 16 only by the braiding step.
That is, as shown in FIGS. 14A and 14I, the valley of the reinforcing layer 20 is the valley of the bellows-shaped portion 16-1 of the resin inner tube 16, specifically, the intermediate rubber layer 18 on the outer peripheral side thereof. May be slightly lifted from the valley of the bellows-shaped portion 18-1.

  However, in the present embodiment, a heat-shrinkable yarn is used as the reinforcing yarn 58, so that the heat-shrinkable reinforcing yarn is then subjected to a vulcanization process described later as shown in FIGS. 14 (A) and (II). 58 is heat-shrinked, so that the reinforcing layer 20 is sufficiently lowered until it closely contacts the valley of the bellows-shaped portion 18-1 in the intermediate rubber layer 18, and the bellows-shaped portion 20-1 of the reinforcing layer 20 is It becomes a bellows shape that satisfactorily follows the 18 bellows shape portion 18-1 without yarn disturbance.

  FIG. 14B shows a comparative example in which the reinforcing layer 20 does not accurately follow the bellows shape of the intermediate rubber layer 18 when braiding is performed without applying sufficient tension to the reinforcing yarn 58. It represents that a trough is in a state of floating from a trough of the intermediate rubber layer 18.

5C in FIG. 5 (III) represents the long tube after the reinforcing layer 20 is formed along the outer peripheral surface of the long tube 10B as described above.
As shown in FIG. 4, the long tube 10C is subsequently passed through an extruder 78, where the outer rubber layer 22 is continuously formed into a covering state along the outer peripheral surface of the long tube 10C. Go.
Also at this time, the outer rubber layer 22 follows the straight shape portion 22-2 following the straight shape portion 20-2 of the long tube 10C, and follows the bellows shape at the bellows shape portion 20-1. It is formed into a bellows-shaped part 22-1.
Since the configuration of the extruder 78 is the same as that of the extruder 42 for the intermediate rubber layer 18, detailed description thereof is omitted here.

10D in FIG. 5 (IV) represents the long tube after the outer rubber layer 22 is formed along the outer peripheral surface of the long tube 10C as described above.
The long pipe 10D is then continuously passed through a tunnel furnace type continuous vulcanizing furnace 80 shown in FIG. 4, where the long pipe 10D is continuously vulcanized by hot air, high pressure steam or the like.
After vulcanization, the long tube 10D is subsequently cut into individual bellows rubber hoses 10 by the automatic cutting machine 82 of FIG.
Here, the cutting of the long tube 10D after vulcanization is performed at one place just between the bellows-shaped portions 10-1 and 10-1 adjacent to each other.

In this automatic cutting machine 82, as shown in FIG. 13, the laser sensor 84 detects the passage of the peak portion of the bellows-shaped portion 10-1 of the long tube 10D that is continuously fed, and the identification thereof. At the position where the long tube 10D has been fed a certain distance from the detection of the passage of the crest, a cutter 86 automatically cuts each bellows rubber hose 10 one after another.
Specifically, here, the laser sensor 84 detects the position of the last peak of the bellows-shaped part 10-1 and the first peak of the next bellows-shaped part 10-1, and the cutter 86 The long tube 10D is cut one after another at exactly one intermediate position.

  In the present embodiment, since the resin inner tube 16 is formed so as not to be crushed even when tension is applied so that the yarn disturbance of the reinforcing yarn 58 does not occur, an excellent braided layer, that is, the reinforcing layer 20 can be formed. it can.

  In the manufacturing method of the bellows rubber hose of the present embodiment as described above, first, the resin inner tube 16 is first formed into a bellows tube, and then the resin inner tube 16 that is a part of the product is used as a mandrel instead of a resin. The intermediate rubber layer 18, the reinforcing layer 20, and the outer rubber layer 22 are sequentially formed in the bellows shape on the outer peripheral surface of the inner tube 16, and then vulcanized. According to this manufacturing method, the conventional manufacturing method is performed. Thus, the resin inner tube 16, the intermediate rubber layer 18, the reinforcing layer 20, and the outer rubber layer 22 are provided without using a mandrel or a bellows shape for giving a bellows shape different from the product. The bellows rubber hose 10 can be molded well.

Further, when the intermediate rubber layer 18 is formed on the outer peripheral side of the resin inner tube 16, the vacuum is sucked between the rubber material extruded from the extruder 42 and the inner peripheral resin inner tube 16. Based on the suction force, the rubber material can be brought into close contact with the ridges and valleys of the bellows-shaped portion 16-1 of the resin inner tube 16, and the intermediate rubber is formed into a corrugated bellows shape following the bellows-shaped portion 16-1. Layer 18 can be shaped.
Moreover, the molding operation can be performed automatically without depending on the manual operation.

  Further, in the present embodiment, the resin straight tube continuously extruded from the extruder 24 is continuously formed into a bellows tube by the corrugating machine 28, and thereafter, on the outer peripheral side of the long resin inner tube 16. The bellows-shaped intermediate rubber layer 18, the reinforcing layer 20, and the outer rubber layer 22 are continuously formed, and after vulcanization, a long vulcanized product (long tube 10 </ b> D) is provided for each one of the predetermined bellows rubber hose 10. The bellows rubber hose 10 can be continuously manufactured.

This manufacturing method also has an advantage that even different types of bellows rubber hoses 10 having different sizes and bellows shapes can be easily and continuously manufactured in a mixed flow state.
Specifically, the bellows rubber hoses 10 having the same shape and the same type are not continuously formed, but two kinds of bellows rubber hoses 10 and 10 having different dimensions can be mixedly produced in a mixed state as shown in FIG.
In this case, in the corrugating machine 28, such different kinds of bellows rubber hoses 10, 10 are mixed by connecting the molding blocks 32 having the molding inner surfaces corresponding to the bellows rubber hoses 10, 10 in a mixed state. It can be manufactured continuously in the state.

  In this embodiment, since the unvulcanized long tube 10D is passed through the continuous vulcanizing furnace 80, the vulcanization process can be automated, and the subsequent cutting process is also automated. can do.

  Here, the automatic cutting is performed by detecting the passage of the peak portion of the bellows-shaped portion 10-1 of the long tube 10D that is continuously sent by the laser sensor 84 and detecting the passage of the specific peak portion. This can be easily performed by continuously and continuously cutting each bellows rubber hose 10 one after another by the cutter 86 at a position where the long tube 10D is fed a certain distance.

Moreover, according to the manufacturing method of this embodiment, since the reinforcement layer 20 can be formed in a favorable bellows shape, the reinforcement effect of the reinforcement layer 20 can be exerted uniformly over the entire length of the bellows rubber hose 10, and the bellows rubber hose 10 The pressure resistance and strength can be effectively increased.
Further, since the reinforcing layer 20 itself is in close contact with the bellows-shaped portion 18-1 of the intermediate rubber layer 18 and the bellows-shaped portion 22-1 of the outer rubber layer 22, peeling of the reinforcing layer 20 is prevented. Thus, the durability of the bellows rubber hose 10 can be enhanced.

  In addition, the bellows rubber hose 10 of the present embodiment can give good permeation resistance to the transport fluid by the resin inner tube 16 and can give a large pressure resistance by the reinforcing layer 20, and has a bellows shape as a whole. Therefore, flexibility and therefore good vibration absorbing performance can be provided.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured and implemented in various forms and modes without departing from the spirit of the present invention.

It is the figure which showed the bellows rubber hose of one Embodiment of this invention. It is sectional drawing of the bellows rubber hose shown in FIG. It is process explanatory drawing which showed the manufacturing method of the bellows rubber hose of one Embodiment of this invention. It is process explanatory drawing following FIG. It is a figure which shows the bellows rubber hose which passed through each process shown in FIG.3 and FIG.4, respectively. It is a figure which shows the corrugated molding machine which shape | molds the resin inner pipe | tube. It is a figure which shows the principal part of FIG. It is a figure which shows the shaping | molding method of an intermediate | middle rubber layer. It is a figure which shows the braiding machine which forms a reinforcement layer. It is a figure which shows the formation method of a reinforcement layer. It is the figure which showed the principal part of FIG.9 and FIG.10. It is explanatory drawing which shows the control method of the rotational speed of the carrier in the braiding machine at the time of braiding a reinforcement layer. It is the figure which showed the cutting process. It is the figure which showed the state of the braiding of a reinforcement yarn with the comparative example. It is explanatory drawing of the advantage of the embodiment. It is the figure which showed the process of the manufacturing method of the conventional bending shape hose. It is the figure which showed the process following FIG. It is the figure which showed the conventional manufacturing method of the hose of a curved shape different from FIG. 16, FIG. 17, and the conventional manufacturing method of a bellows rubber hose. It is the figure which showed the conventional manufacturing method of the bellows rubber hose different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bellows rubber hose 10D Elongate pipe 16 Resin inner pipe 16-1, 18-1, 20-1, 22-1 Bellows shape part 18 Intermediate rubber layer 20 Reinforcement layer 22 Outer rubber layer 24, 42, 78 Extruder 28 Corrugated molding Machine 58 Reinforcement thread (Reinforcement wire)
80 Continuous vulcanizing furnace 82 Automatic cutting machine 84 Laser sensor 86 Cutter

Claims (11)

A method of manufacturing a bellows rubber hose having a resin inner tube forming a bellows tube and a rubber layer on the outer peripheral side of the bellows shape having a corrugated cross section following the bellows shape of the resin inner tube,
(A) a molding step of a resin inner tube for previously molding the resin inner tube into a bellows tube;
(B) Thereafter, the resin inner tube is used as a core body, and a rubber material is extruded from the extruder along the bellows shape in a cylindrical shape on the outer peripheral surface thereof. A rubber layer molding step for molding the rubber layer into a bellows shape having a corrugated cross section following
(C) the subsequent vulcanization process;
The manufacturing method of the bellows rubber hose characterized by including this.   2. The bellows shape of the resin inner tube according to claim 1, wherein the rubber material extruded in a cylindrical shape from the extruder and the resin inner tube on the inner peripheral side thereof are vacuum-sucked to form the extruded rubber material in the bellows shape of the resin inner tube. A method of manufacturing a bellows rubber hose characterized by forming the rubber layer into a bellows shape having a corrugated cross section that follows the bellows shape of the inner pipe of the resin, and is closely adhered along the crest and trough portions. In any one of Claims 1 and 2, the molding step of the resin inner tube is to continuously mold a resin straight tube continuously extruded from an extruder into a bellows tube with a corrugating machine,
The rubber layer molding step is to continuously extrude the rubber material on the outer peripheral side of the long resin inner pipe that is continuously fed thereafter to continuously mold the bellows-shaped rubber layer, The manufacturing method further includes a cutting step of cutting a long vulcanized product into individual hoses each having a predetermined length after the vulcanizing step.   4. The method of manufacturing a bellows rubber hose according to claim 3, wherein the vulcanization step is to continuously pass an unvulcanized long pipe through a vulcanizing furnace to continuously vulcanize the long pipe. .   In any one of Claims 3 and 4, while the said cutting process detects passage of the specific part of the long pipe after vulcanization sent continuously with a sensor, from detection of passage of the specific part A method of manufacturing a bellows rubber hose, characterized in that the long tube is continuously and automatically cut into each of the hoses one after another by a cutter at a position where the long tube is fed a set distance. 5. The bellows rubber hose according to claim 3, wherein the bellows rubber hose has a reinforcing layer that is formed by braiding a reinforcing wire on the outer peripheral side of the resin inner tube and has a wave shape following the bellows shape of the resin inner tube. ,
The reinforcing layer forming step includes braiding the reinforcing wire continuously in a corrugated cross-section along the bellows-shaped crest and trough of the resin inner tube with the resin inner tube as a core, and the resin inner tube The reinforcing layer is continuously formed in a bellows shape having a corrugated cross section following the bellows shape of
The manufacturing method of the bellows rubber hose characterized in that the cutting step cuts the vulcanized product together with the reinforcing layer.   7. The resin inner pipe forming step, the rubber layer forming step, the reinforcing layer forming step, and the vulcanizing step are aligned substantially linearly on a continuous production line. The manufacturing method of the bellows rubber hose. 8. The bellows rubber hose according to claim 6, wherein the rubber bellows hose has an intermediate rubber layer and an outer rubber layer as the rubber layer on the outer peripheral side of the resin inner tube, and the intermediate rubber layer and the outer rubber layer Having the reinforcing layer in between,
The molding step of the rubber layer includes a molding step of the intermediate rubber layer and a molding step of the outer rubber layer, and the molding step of the intermediate rubber layer is arranged on the outer peripheral side with the resin inner tube as a core body. The rubber material for the intermediate rubber layer is continuously extruded along bellows-shaped peaks and valleys of the resin inner pipe, and the intermediate rubber layer has a corrugated cross-section that follows the bellows shape of the resin inner pipe. Which is continuously formed into a shape,
Further, in the molding step of the outer rubber layer, the outer rubber layer is formed by continuously extruding a rubber material for the outer rubber layer along the bellows-shaped crest and trough using the resin inner tube as a core. A method of manufacturing a bellows rubber hose, which is continuously formed into a bellows shape having a corrugated cross section following the bellows shape of the resin inner tube.   The method of manufacturing a bellows rubber hose according to any one of claims 6 to 8, wherein a heat-shrinkable reinforcing wire is used as the reinforcing wire.   Resin inner tube forming a bellows tube formed by molding, an intermediate rubber layer on the outer peripheral side of the bellows shape following the bellows shape of the resin inner tube, and following the bellows shape on the outer peripheral side of the intermediate rubber layer A bellows rubber hose comprising a reinforcing layer formed by braiding a bellows-shaped reinforcing wire, and a bellows-shaped outer rubber layer following the bellows shape on the outer peripheral side of the reinforcing layer.   11. The bellows rubber hose according to claim 10, wherein the resin inner pipe has a strength and a thickness that does not deform even if the reinforcing wire is braided in a state where tension is applied to the outer peripheral side of the resin inner pipe. .

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