JP2009061765A - Hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose capable of masking vibration absorptivity and rigidity compatible with each other. <P>SOLUTION: The hose 1 is provided with a cylindrical inner side layer 3 consisting of a rubber material, a reinforcing layer 5 covering the inner side layer 3 by a plurality of reinforcing threads 5a wound around an outer peripheral surface of the inner side layer 3, and a skin layer 7 consisting of the rubber material, and covering the reinforcing layer 5, in which a 15% modulus of the inner side layer 3 is 1.0 to 2.5 MPa, the wall thickness of the inner side layer 3 is 55 to 90% with respect to the total wall thickness of the inner side layer 3, the reinforcing layer 5, and the skin layer 7, and the value obtained by dividing the total wall thickness by the internal diameter of the inner side layer 3 is set greater than 27 to 50%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hose, and in particular, a cylindrical inner layer made of a rubber material, a reinforcing layer covering the inner layer with a plurality of reinforcing yarns wound around the outer peripheral surface of the inner layer, and a reinforcing layer made of a rubber material. The present invention relates to a hose including at least a covering skin layer.

  2. Description of the Related Art Conventionally, a hose used for piping of an air conditioner apparatus for an automobile is mainly composed of a high pressure rubber hose connected to the outlet side of the compressor and a low pressure rubber hose connected to the inlet side of the compressor.

  In this high-pressure rubber hose, since the refrigerant is at a high temperature and high pressure, it is common to include at least a barrier layer made of polyamide resin or the like in order to suppress permeation of the refrigerant. On the other hand, the low pressure rubber hose has a low temperature and low pressure refrigerant compared to the high pressure side, and is close to the interior of the automobile. Therefore, there is a demand for improving the quiet performance in the car without transmitting the compressor vibration to the car. In general, a barrier layer made of, etc. is not provided.

The low-pressure rubber hose includes a cylindrical inner layer made of a rubber material, a reinforcing layer that covers the inner layer with a plurality of reinforcing yarns wound around the outer peripheral surface of the inner layer, and an outer skin layer that covers the reinforcing layer. (For example, refer patent document 1).
Japanese Patent Laid-Open No. 6-286036

  However, in the conventional low-pressure rubber hose described above, if the vibration absorption is to be improved, the thickness of the hose itself must be reduced, so that the rigidity in the circumferential direction of the hose is reduced. As a result, if the inside of the pipe is evacuated (so-called evacuation) when the refrigerant is replaced, the hose is crushed and blocked, and the refrigerant cannot be sufficiently drawn out of the pipe, so that an appropriate amount of refrigerant can be drawn. Could not be injected.

  On the other hand, when the rigidity of the hose is improved to prevent the hose from being crushed and blocked, the thickness of the hose itself must be increased, resulting in a decrease in vibration absorption. That is, vibration absorption and rigidity are in a trade-off relationship and it was difficult to achieve both.

  Then, this invention is made | formed in view of such a condition, and it aims at providing the hose which can make vibration absorption and rigidity compatible.

  In order to solve the above situation, the present invention has the following features. First, the invention according to the first aspect of the present invention includes a cylindrical inner layer made of a rubber material, a reinforcing layer that covers the inner layer with a plurality of reinforcing yarns wound around the outer peripheral surface of the inner layer, and a rubber material. A hose comprising at least an outer skin layer covering the reinforcing layer, wherein the inner layer has a 15% modulus of 1.0 to 2.5 MPa, and the inner layer has a wall thickness of the inner layer, the reinforcing layer, and the outer layer. The gist is that the total thickness of the skin layer is 55 to 90%, and the value obtained by dividing the total thickness by the inner diameter of the inner layer is set to be larger than 27 to 50%.

  The modulus indicates a stress (a force that the object tries to resist to keep the original shape) when a certain strain (elongation) is applied to the rubber material (elastic body), that is, 15% modulus. Indicates a stress measured when a strain of 15% or more is applied. For example, the modulus is a force for the rubber band to return to its original shape when the rubber band is stretched, or a force for the eraser to return to its original shape when the eraser is pressed with a finger.

  According to such characteristics, the 15% modulus of the inner layer (rubber material) is 1.0 to 2.5 MPa, the thickness of the inner layer is 55 to 90% with respect to the total thickness, and the total thickness is By setting the value divided by the inner diameter of the inner layer to be larger than 27 to 50%, it is possible to achieve both vibration absorption and rigidity (external pressure resistance).

  Specifically, because the hose satisfies the above conditions, the hose is not crushed even when the inside of the pipe is evacuated (so-called vacuuming) at the time of refrigerant replacement or the like. The hose is not blocked. Thereby, a refrigerant | coolant can fully be extracted from the inside of piping, and appropriate refrigerant | coolant amount can be inject | poured into piping.

  Further, even if it is attempted to improve the rigidity of the hose so as to prevent the hose from being crushed and blocked, the vibration absorption can be improved by satisfying the above conditions, and the interior of the vehicle can be improved. The quiet performance can be secured. That is, it is possible to achieve both vibration absorption and hose rigidity.

  Another aspect of the invention is characterized in that the inner layer is selected from butyl rubber, halogenated butyl rubber, and butyl rubber-halogenated butyl rubber copolymer.

  The gist of the invention relating to other features is that the number of twists of the reinforcing yarn (the number of twisted reinforcing yarns (so-called twisted number)) is 8 times / 10 cm or less.

  Another aspect of the invention is characterized in that the outer skin layer is selected from acrylic rubber.

  The invention according to another feature is characterized in that the outer skin layer is a composition containing an ethylene-propylene copolymer and a butyl rubber.

  The ratio of the ethylene-propylene copolymer is preferably 30 phr or less.

  According to the present invention, it is possible to provide a hose capable of achieving both vibration absorption and rigidity.

  Hereinafter, an example of the hose according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings is contained.

  FIG. 1 is a partially exploded perspective view showing a hose according to the present embodiment. The hose 1 according to the present embodiment is used for piping of an automobile cooler hose, and specifically, is a low-pressure rubber hose connected to the inlet side of a compressor.

  As shown in FIG. 1, the hose 1 includes a cylindrical inner layer 3 made of rubber, a reinforcing layer 5 that covers the inner layer 3, and an outer skin layer 7 that is made of rubber and covers the reinforcing layer 5. .

  The inner layer 3 is disposed on the innermost radial direction of the hose 1. The inner layer 3 is selected from butyl rubber or a copolymer of halogenated butyl rubber, butyl rubber and halogenated butyl rubber. As the butyl rubber and halogenated butyl rubber constituting the inner layer 3, conventionally known ones are used as they are. Generally, a rubber material (IIR) obtained by copolymerizing isobutylene and a small amount of isoprene, Chlorinated IIR, brominated IIR and the like obtained by halogenating it.

  When forming the inner layer 3 using this butyl rubber or halogenated butyl rubber, as is well known, these rubber materials include necessary reinforcing agents such as carbon black, fillers, crosslinking materials, crosslinking accelerators, A chemical imparting cross-linking properties such as a cross-linking aid, a plasticizer, an anti-aging agent, a processability improving agent, an adhesion-imparting agent, and the like are blended and kneaded with an internal mixer or the like.

  At this time, by blending an appropriate chemical, the 15% modulus of the inner layer 3 (rubber material) is set to 1.0 to 2.5 MPa. When the 15% modulus is lower than 1.0 MPa, the rigidity of the hose 1 itself is reduced, and the hose 1 is crushed and closed when the inside of the pipe is evacuated during refrigerant replacement or the like. On the other hand, if the 15% modulus is higher than 1.0 MPa than 2.5 MPa, the rigidity of the hose 1 itself is increased, and vibration absorption is reduced.

  The thickness of the inner layer 3 is 55 to 90% with respect to the total thickness of the inner layer 3, the reinforcing layer 5, and the outer skin layer 7. Preferably, the inner layer 3 has a thickness of 60% or more with respect to the total thickness.

  If the thickness of the inner layer 3 is less than 55%, the rigidity of the hose 1 itself is reduced, and the hose 1 is crushed and closed when the inside of the pipe is evacuated during refrigerant replacement or the like. . Further, when the inner layer 3 is thicker than 90%, the outer layer of the hose 1 itself set in advance is taken into consideration, and when the inner layer 3 is thickened, the reinforcing layer 5 and the outer skin layer 7 are disposed. It becomes difficult to do.

  The reinforcing layer 5 is composed of a plurality of reinforcing yarns 5 a wound around the outer peripheral surface of the inner layer 3, and is disposed between the inner layer 3 and the outer skin layer 7. The reinforcing yarn 5a is preferably selected from organic fibers such as vinylon, polyester, aromatic polyester, polyamide, and aromatic polyamide.

  The reinforcing yarn 5a is knitted so as to intersect the axis of the hose 1 in advance, and constitutes a reinforcing layer 5 having a one-layer structure by being wound around the outer peripheral surface of the inner layer 3.

  The number of twists of the reinforcing yarn 5a is preferably 8 times / 10 cm or less. If the number of twists of the reinforcing yarn 5a is greater than 8 times / 10 cm, the reinforcing layer 5 becomes thick, and the thickness of the inner layer 3 is set in consideration of the preset outer diameter of the hose 1 itself. It may be difficult to increase the thickness.

  The thickness of one reinforcing yarn 5a is preferably 56 to 778 tex (500 to 7000 denier). More preferably, the thickness of one reinforcing yarn 5a is 222 to 667 tex (2000 to 6000 denier).

  If the thickness of one reinforcing thread 5a is smaller than 56 tex, the rigidity of the hose 1 itself is reduced, and the hose 1 is crushed and closed when the inside of the pipe is evacuated during refrigerant replacement or the like. May end up. In addition, if the thickness of one reinforcing yarn 5a is larger than 778 tex, the rigidity of the hose 1 itself is increased, and vibration absorption may be reduced.

  The outer skin layer 7 is disposed on the radially outer side of the inner layer 3 and the reinforcing layer 5, that is, on the outermost radial direction of the hose 1. The outer skin layer 7 is selected from acrylic rubber such as acrylic rubber, ethylene-acrylic rubber, acrylic rubber, and a copolymer of styrene-acrylic rubber.

  Moreover, even if the outer skin layer 7 is ethylene-propylene rubber, it is possible to achieve both vibration absorption and rigidity of the hose 1.

  Further, the hose having improved vibration transmission characteristics can be obtained by forming the outer skin layer 7 with a blend of ethylene-propylene copolymer (for example, EPM or EPDM) and butyl rubber (for example, butyl rubber or halogenated butyl rubber). Obtainable. Thus, when the outer skin layer 7 is composed of a blend of ethylene-propylene copolymer and butyl rubber, the ratio of the ethylene-propylene copolymer is preferably 30 phr or more. This is because if the ratio of the ethylene-propylene copolymer is smaller than 30 phr, the ozone resistance is lowered and the durability of the hose 1 is affected.

Here, the value obtained by dividing the total thickness of the hose 1 by the inner diameter of the hose 1 (that is, the inner diameter of the inner layer 3) is set to be larger than 27 to 50%. If this value is less than 27%, the rigidity of the hose 1 itself becomes small, and the hose 1 may be crushed and closed when the piping is evacuated at the time of refrigerant replacement or the like. On the other hand, if this value is larger than 50%, the rigidity of the hose 1 itself is increased, and the vibration absorption is reduced.
(Example of change)
In the hose 1 according to the above-described embodiment, the reinforcing layer 5 having a one-layer structure is formed by winding the reinforcing yarn 5 a knitted in advance so as to intersect the axis of the hose 1 around the outer peripheral surface of the inner layer 3. However, it may be modified as follows. In addition, the same code | symbol is attached | subjected to the same part as the hose 1 which concerns on embodiment mentioned above, and a different part is mainly demonstrated.

  FIG. 2 is a partially exploded perspective view showing a hose according to a modification. As shown in FIG. 2, the hose 1 includes a cylindrical inner layer 13, an inner reinforcing layer 15 that covers the inner layer 13, an intermediate layer 17 that covers the inner reinforcing layer 15, and the intermediate layer 17. An outer reinforcing layer 19 for covering and an outer skin layer 21 for covering the outer reinforcing layer 19 are provided.

  The inner reinforcing layer 15 is composed of a plurality of inner reinforcing yarns 15 a wound around the outer peripheral surface of the inner layer 13, and is disposed between the inner layer 3 and the intermediate layer 17. This inner reinforcing thread 15 a is inclined with respect to the axis of the hose 1.

  The intermediate layer 17 is disposed between the inner reinforcing layer 15 and the outer reinforcing layer 19. The intermediate layer 17 is used to secure an adhesive force between the inner reinforcing layer 15 and the outer reinforcing layer 19 and to bond the inner reinforcing layer 15 and the outer reinforcing layer 19 with a thread (reinforcing thread) passed through the reinforcing layer 5. In order to secure the strength, it is preferably selected from butyl rubber, halogenated butyl rubber, butyl rubber and halogenated butyl rubber copolymer, ethylene / propylene rubber, and blends thereof. The intermediate layer 17 may be other than the above material as long as it can secure the adhesive force between the inner reinforcing layer 15 and the outer reinforcing layer 19, and is not limited to the above material. .

  The outer reinforcing layer 19 is composed of a plurality of outer reinforcing yarns 19 a wound around the outer peripheral surface of the intermediate layer 17, and is disposed between the intermediate layer 17 and the outer skin layer 21. The outer reinforcing layer 19 is inclined from the outer peripheral surface of the intermediate layer 17 so as to intersect with the inner reinforcing yarn 15a.

That is, the inner reinforcing layer 15 and the outer reinforcing layer 19 described above constitute a reinforcing layer having a two-layer structure. The intermediate layer 17 is described as being disposed between the inner reinforcing layer 15 and the outer reinforcing layer 19, but the intermediate layer 17 is not necessarily disposed.
[Other embodiments]
As described above, the contents of the present invention have been disclosed through the embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention.

  Specifically, the hose 1 has been described as a low-pressure rubber hose connected to the inlet side of the compressor. However, the hose 1 is not limited to this and is compatible with flexibility and rigidity such as vibration absorption. Of course, it can be applied to the desired hose.

From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.
(Action / Effect)
According to the hose 1 according to the present embodiment described above, the 15% modulus of the inner layer 3 is 1.0 to 2.5 MPa, and the thickness of the inner layer 3 is 55 to 90% with respect to the total thickness. Thus, by setting the value obtained by dividing the total thickness by the inner diameter of the inner layer 3 to be greater than 27 to 50%, it is possible to achieve both vibration absorption and rigidity (external pressure resistance).

  Specifically, since the hose 1 satisfies the above conditions, the hose 1 will not be crushed even when the inside of the pipe is evacuated (so-called vacuuming) at the time of refrigerant replacement or the like. The hose 1 is not blocked. Thereby, a refrigerant | coolant can fully be extracted from the inside of piping, and appropriate refrigerant | coolant amount can be inject | poured into piping.

  Further, even if it is attempted to improve the rigidity of the hose 1 to suppress the hose 1 from being crushed and blocked, the vibration absorption can be improved by satisfying the above conditions. Thus, the quiet performance in the car can be secured. That is, it is possible to achieve both vibration absorption and hose rigidity.

  First, the inventor considered only the vibration absorption of the hose. It was found that the hose having a 15% modulus of the inner layer 3 of 1.0 to 2.5 MPa is excellent in vibration absorption. In particular, it was found that when the inner layer 3 is formed of butyl rubber (IIR), the vibration absorption is more excellent. Further, it has been found that the thinner the total thickness of the butyl rubber (IIR) blended, the better the vibration absorption.

  However, even if the total wall thickness is reduced and vibration absorption is improved, the rigidity in the circumferential direction of the hose decreases, and if the inside of the pipe is evacuated (so-called evacuation) when the refrigerant is replaced, the hose Crushes and closes.

  In view of this, the inventor found that the inner layer 3 has a 15% modulus of 1.0 to 2.5 MPa, the inner layer 3 has a thickness of 55 to 90% of the total thickness, It has been discovered that the value obtained by dividing the thickness by the inner diameter of the inner layer 3 is set to be greater than 27 to 50%, thereby achieving both vibration absorption and rigidity.

  In particular, the inner layer 3 is selected from butyl rubber, halogenated butyl rubber, butyl rubber-halogenated butyl rubber copolymer, the number of twists of the reinforcing yarn is 8/10 cm or less, and the outer skin layer is acrylic rubber. It was found that the vibration absorption and rigidity can be improved by selecting from the above.

  Next, in order to further clarify the effects of the present invention, test results performed using the hoses according to the following Comparative Examples 1 to 5 and Examples 1 to 3 will be described. In addition, this invention is not limited at all by these examples.

  Table 1 shows the configuration of each hose and the test results (vibration transmission rate, hose stiffness, and ozone resistance). In each hose, butyl rubber (IIR) was used for the inner layer and ethylene-propylene copolymer (EPDM) was used for the outer layer.

＜振動伝達率＞
長さ３００ｍｍの各ホースの一端に３００Ｈｚ、３Ｇ加速度の振動をかけた際、ホースの他端に伝わった振動の加速度から振動伝達率（ｄＢ）を測定した。なお、数値が小さいほど、振動伝達率が低く、静寂性能に優れている。特に、−３０ｄＢ以下であると、実使用時の室内への振動が伝わらなくなり、静寂性能に優れている。

<Vibration transmissibility>
When 300 Hz and 3 G acceleration vibrations were applied to one end of each 300 mm long hose, vibration transmission rate (dB) was measured from the acceleration of vibration transmitted to the other end of the hose. In addition, the smaller the numerical value, the lower the vibration transmission rate and the better the silence performance. In particular, when it is −30 dB or less, vibrations in the room during actual use are not transmitted, and the quiet performance is excellent.

As a result, as shown in Table 1, the hoses according to Examples 1 to 3 have lower vibration transmissibility than the hoses according to Comparative Examples 2, 3, and 5 and are excellent in quiet performance in the vehicle. It was found that the vibrations in the room could not be transmitted and the vibrations could be absorbed.
<Hose rigidity (crushing negative pressure)>
The hose according to Comparative Examples 1 to 5 and Examples 1 to 3 is used as a low pressure rubber hose connected to the inlet side of the compressor in the air conditioner of an automobile, and the inside of the piping at the time of refrigerant replacement or the like is evacuated (so-called evacuation) And measured whether the hose was crushed.

  As a result, as shown in Table 1, in the automobile in which the hose according to Examples 1 to 3 is used, the hose is not crushed compared to the automobile in which the hose according to Comparative Examples 1 and 4 is used. It was found that the hose was not blocked and was excellent in rigidity.

<Ozone resistance>
About the hose which concerns on Examples 1-3 and the hose which concerns on Comparative Examples 1-5, the ozone resistance test was done. The test method for ozone resistance is as follows. Under a bending condition of 6 times the hose outer diameter, the ozone concentration was 50 pphm and 40 ° C., and the hose was left for 200 hours. Then, the hose was straightened and the presence or absence of the crack in the outer skin layer of the hose was evaluated.

  As a result, no crack was generated for all the hoses, and good results were obtained.

  The same test as described above was performed on the hose of Examples 4 to 6 which differs from the hose of Example 1 only in the constituent material of the outer skin layer. Example 4 is an acrylic rubber for the outer skin layer, Example 5 is a weight ratio of EPDM / chlorobutyl rubber = 35/65 for the outer skin layer, and Example 6 is a weight of EPDM / chlorobutyl rubber = 20/80 for the outer skin layer. It is a ratio.

表２に示すように、実施例４〜６のいずれのホースについても、負圧によるつぶれは発生せず、ホースの剛性について良好な結果が得られた。また、振動伝達率については、実施例１〜３（外皮層をＥＰＤＭで構成したもの）よりも良好な結果が得られた。

As shown in Table 2, for any of the hoses of Examples 4 to 6, no crushing due to negative pressure occurred, and good results were obtained with respect to the rigidity of the hose. As for the vibration transmissibility, better results were obtained than in Examples 1 to 3 (the outer skin layer was made of EPDM).

As for ozone resistance, cracks did not occur in Examples 4 and 5 and good results were obtained, but cracks in Example 6 were confirmed.
<Overall results>
As shown in Tables 1 and 2, in the hoses according to Examples 1 to 6, the vibration transmission rate and the rigidity can be improved, and the inside of the pipe is evacuated (so-called evacuation) when the refrigerant is replaced However, since the hose is not crushed, it was found that the hose is not blocked and the quiet performance in the vehicle can be secured. That is, it was found that in the automobile in which the hose according to Examples 1 to 6 was used, both vibration absorption and hose rigidity were compatible.

It is a partially exploded perspective view which shows the hose which concerns on this Embodiment. It is a partially exploded perspective view which shows the hose which concerns on a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hose 3 ... Inner layer 5 ... Reinforcement layer 5a ... Reinforcement yarn 7 ... Outer skin layer 13 ... Inner layer 15 ... Inner reinforcement layer 15a ... Inner reinforcement yarn 17 ... Middle layer 19 ... Outer reinforcement layer 19a ... Outer reinforcement yarn 21 ... Outer Skin layer

Claims (6)

A cylindrical inner layer made of a rubber material, a reinforcing layer that covers the inner layer with a plurality of reinforcing threads wound around the outer peripheral surface of the inner layer, and an outer skin layer that is made of a rubber material and covers the reinforcing layer A hose with at least
The inner layer has a 15% modulus of 1.0 to 2.5 MPa,
The wall thickness of the inner layer is 55 to 90% with respect to the total wall thickness of the inner layer, the reinforcing layer, and the outer skin layer,
A value obtained by dividing the total thickness by the inner diameter of the inner layer is set to be larger than 27 to 50%.   The hose according to claim 1, wherein the inner layer is selected from butyl rubber, halogenated butyl rubber, and butyl rubber-halogenated butyl rubber copolymer.   The hose according to claim 1 or 2, wherein the number of twists of the reinforcing yarn is 8 times / 10 cm or less.   The hose according to any one of claims 1 to 3, wherein the outer skin layer is selected from acrylic rubber.   The hose according to any one of claims 1 to 3, wherein the outer skin layer is a composition containing an ethylene-propylene copolymer and a butyl rubber.   The hose according to claim 5, wherein a ratio of the ethylene-propylene copolymer is 30 phr or less.

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