JP2010144759A - Hose joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose joining method useful for efficiency increase and improvement of working easiness in assembly work of a hose and a hose fitting in which insertion assist agent could not be used since slipping off or the like after assembly is worried about. <P>SOLUTION: In this hose joining method, the hose fitting 2 and the hose 1 is joined by inserting the roughly cylindrical hose fitting 2 in an end part opening 1a of the hose 1 of which innermost layer is a rubber layer. The insertion assist agent comprising at least (A) and (B) components and having its volumetric mix ratio (A) component/(B) component in a range of 99/1-60/40 is applied in an outer circumference surface of the hose fitting 2 or an inner circumference surface of the hose end part opening 1a, and the hose fitting 2 and the hose 1 is joined. (A): C2-C4 alcohols solvent. (B): rubber plasticizer. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a hose coupling method, and more particularly, to a hose coupling method that can be applied to coupling of hoses that require pressure resistance, such as air hoses and fuel hoses in vehicles such as automobiles. It is.

  2. Description of the Related Art Conventionally, an air hose or a fuel hose of an automobile or the like is often made of an innermost layer of rubber in order to ensure sealing performance when assembled to a hose base. Such a hose usually has a laminated structure. For example, in order to improve the pressure resistance, durability, etc. of the hose, an aromatic polyamide fiber or a polyester fiber is used between the outer peripheral surface and the interlayer of the hose. A reinforcing yarn layer formed by braiding the reinforcing yarn is laminated.

  The hose is usually attached to each device in the engine room by inserting a substantially cylindrical hose base provided in each device into an end opening of the hose.

Then, when attaching the hose as described above, lubricating oil is applied as an insertion aid to the outer peripheral surface of the hose base or the inner peripheral surface of the hose end opening in order to reduce the insertion load of the hose. (For example, refer to Patent Document 1).
JP 58-187688 A

  However, when the insertion aid is used as described above, the problem is that after insertion, the insertion aid remaining between the hose base outer peripheral surface and the hose inner peripheral surface makes it easy for the hose to come off or slip out of the base. May occur. In particular, since strong vibration is generated in the engine room, the vibration tends to apply a strong tensile force to the hose, and the above-described hose disconnection is likely to occur. Therefore, in the present situation, the insertion aid has not been used in the past where the hose is likely to come off.

  On the other hand, heat-resistant air hoses, such as turbo air hoses, blow-by gas hoses, emission control hoses, vacuum brake hoses, etc., as described above, usually have a reinforcing yarn layer to increase pressure resistance. In many cases, the hose base is tightly inserted. Even if the insertion is tight (the insertion load is large), it is necessary to force the insertion work without using an insertion aid at the location where the hose is likely to come off as described above. There are concerns about deterioration in assembly work efficiency and health hazards to workers. Therefore, it is also considered to design the hose side so that the knitting angle of the reinforcing yarn constituting the reinforcing yarn layer is reduced and the diameter of the hose is easily expanded when the base is inserted. When the knitting angle of the reinforcing yarn is reduced, the contraction force of the expanded hose opening is reduced and the hose connectivity is deteriorated, so that the hose is likely to come off. In addition, when the knitting angle of the reinforcing yarn is reduced, the hose reinforcing effect by the reinforcing yarn layer is also reduced, so that the hose expands and deforms in the radial direction as the internal pressure in the hose increases, which causes a problem in hose performance. Therefore, there is a demand for a technique for improving the insertion property of the hose base without changing the knitting angle of the reinforcing yarn to be small.

  The present invention was made in view of such circumstances, and improved workability in the work of assembling the hose base and the hose for which the insertion aid could not be used due to fear of hose disconnection after assembling. It is another object of the present invention to provide a hose coupling method useful for efficiency.

In order to achieve the above object, the hose coupling method of the present invention inserts a substantially cylindrical hose base into the end opening of the hose whose innermost layer is a rubber layer, and couples the hose base with the hose. A hose coupling method, comprising at least the following components (A) and (B) on the outer peripheral surface of the hose base or the inner peripheral surface of the hose end opening, the volume mixing ratio of which is: (B) It is configured to apply an insertion aid in the range of component = 99/1 to 60/40 and to bond the hose base and the hose.
(A) Alcohol solvents having C _{2 to} C ₄ carbon atoms.
(B) Rubber plasticizer.

That is, the present inventors have intensively studied to solve the above problems. Then, as an insertion aid when inserting the hose end to the end opening of the hose, it recalled the use of those carbon atoms was dissolved rubber plasticizer alcohol solvent C ₂ -C _4. Thus, when a plasticizer is added to the insertion aid, the hose base can be smoothly inserted by the action of the plasticizer, and workability is improved. Further, since the solvent for the insertion aid is a specific alcohol solvent, it has high volatility. Therefore, after insertion of the hose base, the solvent volatilizes without remaining at the interface between the hose and the hose base. As a result of further research by the inventors, when the ratio of the alcohol solvent and the plasticizer in the insertion aid is set within a specific range, the plasticizer is a plasticizer for rubber. After the hose cap is inserted, the plasticizer is absorbed by the rubber (rubber layer) on the inner peripheral surface of the hose, or most or all of the plasticizer volatilizes when the solvent is volatilized. It was ascertained that the above-mentioned insertion aid does not remain at the interface. Therefore, even in places where strong vibrations occur, such as in the engine room, by applying the hose coupling method of the present invention using the above-mentioned specific insertion aid, the hose can be detached from the base after the hose is assembled. The present inventors have found that it is possible to eliminate the problems seen when using conventional insertion aids, such as or the like, and have reached the present invention.

  Further, in the hose coupling method of the present invention, the hose assembly workability can be improved as described above without changing the design on the hose side so that the knitting angle of the reinforcing yarn constituting the reinforcing yarn layer becomes small. Can do. Therefore, other problems caused by reducing the knitting angle of the reinforcing yarn (decrease in the contraction force of the expanded hose opening, expansion deformation due to an increase in the internal pressure of the hose, etc.), and improve the insertability of the hose base Will be able to.

As described above, the hose coupling method of the present invention uses an insertion aid in which an alcohol solvent having a carbon number of C _{2 to} C ₄ and a plasticizer for rubber are blended at a specific ratio, so that the end of the hose is used. When the hose base is inserted into the opening, it can be inserted smoothly, and after insertion, the above-mentioned insertion aid does not remain at the interface between the hose and the base. The problem seen when using the conventional insertion aid, such as shifting, can be solved. Therefore, in the hose coupling method of the present invention, the hose at a place where the insertion aid cannot be used due to concern about hose disconnection after assembly (for example, a place where strong vibration occurs in the engine room, etc.). It can greatly contribute to the improvement of the workability of assembling the base and the hose.

  In particular, if the alcohol solvent in the insertion aid is ethanol, 2-propanol, 1-butanol, or 2-butanol, the volatility is high, and therefore the hose coupling method of the present invention can be performed more advantageously. .

  If the plasticizer in the insertion aid is an adipate oil, sebacate oil, phosphate oil, phthalate oil, polyester oil, or phthalate ester compound, it is absorbed by the rubber on the inner peripheral surface of the hose. Since it is easy, the hose coupling | bonding method of this invention can be performed more advantageously.

  Further, when the hose constitutes a reinforcing yarn layer and the knitting angle of the reinforcing yarn is set in a range of 45 to 75 °, the contraction force of the hose opening expanded by insertion of the hose base is high. In addition, it does not cause expansion deformation or the like accompanying the increase in the internal pressure of the hose.

  Next, embodiments of the present invention will be described in detail.

As shown in FIG. 1, the hose coupling method of the present invention is a hose coupling method in which a substantially cylindrical hose base 2 is inserted into the end opening 1 a of the hose 1 and the hose base 2 and the hose 1 are coupled. And the outer peripheral surface 2a of the hose base 2 or the inner peripheral surface of the hose end opening 1a is composed of at least the following components (A) and (B), and the volume mixing ratio is (A) / (B) The insertion aid which is the range of component = 99/1-60/40 is apply | coated, and the said hose base 2 and the hose 1 are couple | bonded.
(A) Alcohol solvents having C _{2 to} C ₄ carbon atoms.
(B) Rubber plasticizer.

  The hose 1 has a single layer or a plurality of constituent layers, and the innermost layer is required to be a rubber layer. FIG. 2 shows an example of the hose 1, which includes an innermost layer 11, a reinforcing yarn layer 12, and an outermost layer 13, and the innermost layer 11 is a rubber layer. When the hose 1 has a single layer structure, the entire hose needs to be made of rubber. The hose 1 has an inner diameter smaller than the outer diameter of the hose base 2.

  Examples of the rubber that is the material of the innermost layer of the hose 1 include ethylene-acrylic rubber (AEM), acrylic rubber (ACM), silicone rubber (VMQ), fluororubber (FKM), and acrylonitrile-butadiene rubber (NBR). ), Natural rubber (NR), butadiene rubber (BR), styrene-butadiene rubber (SBR), ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM), hydrogenated NBR, hydrogenated SBR, isoprene rubber, etc. Can be given. These may be used alone or in combination of two or more. Of these, acrylic rubber, silicone rubber, fluororubber, and acrylonitrile-butadiene rubber are preferred for applications such as heat-resistant air hoses.

  In the innermost layer material, a vulcanizing agent, carbon black, a plasticizer, a process oil, a vulcanization accelerator, a white filler, and the like can be appropriately blended as necessary.

  Moreover, when using the said hose 1 for uses, such as a heat-resistant air hose, it is preferable to comprise a reinforcement thread | yarn layer in the interlayer of a hose, or an outer peripheral surface, as shown, for example in FIG. When the knitting angle of the reinforcing yarn is set in the range of 45 to 75 °, the hose end opening 1a expanded by insertion of the hose base 2 has a high contraction force and expands as the hose internal pressure increases. This is preferable because it does not cause deformation or the like. In the case of configuring such a knitted reinforcing yarn layer, conventionally, there is a problem in the insertion work of the hose base, and even when an insertion aid is used to solve this problem, The insertion aid remaining at the interface between the hose and the base has caused problems such as the hose coming off or slipping from the base. By applying the hose coupling method of the present invention as described above, these problems have occurred. Can be eliminated.

  The hose base 2 is made of metal or resin and has a substantially cylindrical shape. Moreover, although the said hose cap 2 is normally provided in the apparatus which couple | bonds a hose, another member may be sufficient as the said apparatus.

As described above, the insertion aid is composed of at least the following components (A) and (B), and the volume mixing ratio thereof is (A) component / (B) component = 99/1 to 60/40. It is necessary to be in the range. Preferably, it is in the range of (A) component / (B) component = 90 / 10-75 / 25. That is, when the ratio of the plasticizer for rubber (component B) is less than the above range, when the hose base 2 is inserted into the hose end opening 1a, it cannot be smoothly inserted and the assembly workability is poor. Conversely, when the ratio of the plasticizer for rubber (component B) exceeds the above range, the plasticizer absorbability of the rubber in the innermost layer of the hose 1 and the volatilization of the plasticizer become insufficient, and after the hose is assembled. This is because there arises a problem that the hose 1 is detached from the base 2 due to vibration or the like. The above “consisting of at least the following components (A) and (B)” means that 50% by volume or more of the insertion aid is composed of components (A) and (B). In addition, all the insertion aids include the components (A) and (B). In the insertion aid, water is usually used as a component other than the components (A) and (B).
(A) Alcohol solvents having C _{2 to} C ₄ carbon atoms.
(B) Rubber plasticizer.

  Examples of the alcohol solvent (component A) in the insertion aid include ethanol, 2-propanol, 1-butanol, 2-butanol and the like. These may be used alone or in combination of two or more.

  Examples of the rubber plasticizer (component B) in the insertion aid include, for example, adipate oil, sebacate oil, phosphate oil, phthalate oil, polyester oil, phthalate ester compound, and the like. . These may be used alone or in combination of two or more. In particular, it is preferable to use the plasticizer used for the material of the innermost layer of the hose so as not to affect the hose.

  Examples of the adipate oil include adipic acid diester compounds such as dioctyl adipate (DOA) and diisononyl adipate (DINA). Examples of the sebacate oil include sebacate compounds such as di-2-ethylhexyl sebacate (DOS) and dibasic esters. Examples of the phosphate oil include phosphate ester compounds such as tricresyl phosphate (TCP). Examples of the phthalate oil include diphthalate diester compounds such as dibutyl phthalate (DBP), mixed oil of dioctyl phthalate (DOP) and diisononyl phthalate (DINP). As the polyester oil, for example, an adipic acid polyester compound is used. For example, diallyl phthalate (DAP) is used as the phthalate ester compound.

  The insertion aid may be applied to the outer peripheral surface 2a of the hose base 2 or the inner peripheral surface of the hose end opening 1a even if a large amount of auxiliary agent sufficient to improve the insertion workability is applied. No problem. By performing such application, it is possible to ensure good assembling workability without residual auxiliary agent after insertion. The insertion aid can be applied, for example, by spraying or brushing.

  Next, examples will be described together with comparative examples. However, the present invention is not limited to these examples.

[Examples 1-8, Comparative Examples 1-6]
Prepare the materials shown in Table 1 and Table 2 below (ethanol, rubber plasticizer DOS (di-2-ethylhexyl sebacate), water), mix in the ratios shown in Table 1 and Table 2, and mix these By doing so, an insertion aid was prepared.

  Using the insertion aids of Examples and Comparative Examples thus obtained, each property was evaluated according to the following criteria. These results are shown in Tables 1 and 2 below.

[Manual insertion]
First, in order from the innermost layer, a hose was prepared by laminating a super heat resistant acrylic rubber layer (thickness 3 mm) / aramid braided layer / super heat resistant acrylic rubber layer (thickness 2 mm). This hose has an inner diameter of 53 mm, and is formed by expanding its diameter so that its end opening has an inner diameter of 60 mm (expanded by a mandrel when the hose is not vulcanized). Next, after applying the insertion aid obtained by the above preparation to the inner peripheral surface of the end opening of this hose, a metal pipe (length: 35 mm) having an outer diameter of 61 mm is manually inserted, and the hose at that time The maximum value of the side load (insertion load) was measured by an autograph (STROGRAPH, manufactured by TOYOSEIKI). And the thing whose value is 210N or less was determined as "(circle)", and the thing exceeding 210N was determined as "x".

[Autograph insertion load]
According to the above procedure, the load average when a metal pipe was inserted into the hose at a speed of 30 mm / min by 15 mm was measured by an autograph (AGS-10KNG, manufactured by SHIMADZU).

[Hist / pipe interface auxiliary agent remaining]
In accordance with the above procedure, an insertion aid was applied to the inner peripheral surface of the hose end opening, and then the metal pipe was inserted and left in a 35 ° C. atmosphere for 24 hours. Thereafter, the metal pipe was removed, and the state of the insertion aid remaining on the inner peripheral surface of the hose was visually observed. Then, the case where no insertion aid remained was determined as “◯”, and the case where the insertion aid remained was determined as “x”.

〔Comprehensive evaluation〕
When the determination of the manual insertion and the determination of the presence or absence of the auxiliary agent at the hose / pipe interface were both good, it was evaluated as “◯”, and the others were evaluated as “x”.

  From the above results, in each of the examples, the metal pipe could be smoothly inserted, and the insertion aid did not remain at the interface between the hose and the metal pipe after the insertion. Therefore, in this embodiment, it is considered that the embodiment improves the workability of assembling the hose and solves the problem that the hose comes off or shifts from the base after the hose is assembled.

  On the other hand, in Comparative Example 1, since the insertion load is high, it can be seen that the hose assembly workability is inferior. In Comparative Examples 2 to 6, since the ratio of the plasticizer in the insertion aid is large and the plasticizer tends to remain at the interface between the hose and the metal pipe, there is a concern about hose disconnection after assembly.

In addition, instead of ethanol contained in the insertion aid used in the examples, other alcohol solvents having ₂ to ₄ carbon atoms (2-propanol, 1-butanol, 2-butanol) are used. Even so, it was confirmed by experiments that the same results as in the above-described example were obtained. Further, in place of the plasticizer (DOS) contained in the insertion aid used in the examples, other rubber plasticizers (adipate oil, sebacate oil, phosphate oil, phthalate oil, polyester oil and Even in the case of using a phthalate ester compound), it was confirmed by experiments that the same results as in the above examples were obtained.

  The hose coupling method of the present invention can be advantageously applied to the coupling of hoses that require pressure resistance, such as air-based hoses and fuel-based hoses in transport equipment such as automobiles. In particular, in the hose coupling method of the present invention, assembling work for a heat-resistant air hose in which a reinforcing yarn layer is configured to increase pressure resistance, such as a turbo air hose, a blow-by gas hose, an emission control hose, a vacuum brake hose, etc. In addition, it is possible to eliminate hose disconnection after assembling and the like observed when using a conventional insertion aid.

It is explanatory drawing which shows an example of the hose coupling | bonding method of this invention. It is a block diagram which shows an example of a laminated hose.

Explanation of symbols

1 hose 2 hose base 1a hose end opening 2a hose base outer peripheral surface

Claims (4)

A hose coupling method in which a substantially cylindrical hose base is inserted into an end opening of a hose whose innermost layer is a rubber layer, and the hose base and the hose are coupled to each other, the outer surface of the hose base or the hose The inner peripheral surface of the end opening is composed of at least the following components (A) and (B), and the volume mixing ratio is in the range of (A) component / (B) component = 99/1 to 60/40. A hose coupling method comprising applying an insertion aid and coupling the hose base and the hose.
(A) Alcohol solvents having C _{2 to} C ₄ carbon atoms.
(B) Rubber plasticizer.   The hose coupling method according to claim 1, wherein the component (A) in the insertion aid is at least one selected from the group consisting of ethanol, 2-propanol, 1-butanol and 2-butanol.   The component (B) in the insertion aid is at least one selected from the group consisting of adipate oil, sebacate oil, phosphate oil, phthalate oil, polyester oil, and phthalate ester compound. Item 3. The hose coupling method according to Item 1 or 2.   The hose coupling method according to any one of claims 1 to 3, wherein the hose constitutes a reinforcing yarn layer, and a knitting angle of the reinforcing yarn is set in a range of 45 to 75 °.

Images