JP2005036965A - Pressure resistant vibration absorption hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure resistant vibration absorption hose having excellent withstand pressure performance and vibration absorption property and capable of shortening hose length. <P>SOLUTION: A reinforcing cloth 18A is wound around an outer face of a cylindrical inner side rubber layer 16 having a bellows part to constitute a reinforced layer 18. In the bellows part, crest parts and trough parts adjacent in the longitudinal direction of the hose are incontinuous and independent from each other. Rigid and annular restraint rings 26 which are independent from each other in the longitudinal direction of the hose are externally fitted in the trough parts of the bellows part from an outer side of the reinforced layer 18 to restrain and reinforce the trough parts in the direction of diameter expansion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pressure-resistant vibration absorbing hose, and more particularly to a pressure-resistant vibration absorbing hose suitable for application to a piping hose disposed in an engine room of an automobile.

Conventionally, hoses mainly composed of a cylindrical rubber layer have been widely used in various applications as industrial and automotive hoses.
The main purpose of using such a hose is to absorb vibrations.

  For example, in the case of a piping hose disposed in an 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 And plays a role of suppressing vibration from being transmitted from one member connected through the hose to the other member.

  By the way, the structure of the oil system, the fuel system, the water system, and the refrigerant system hose regardless of the industrial use and the automobile use, for example, a reinforcing thread is provided between the inner rubber layer and the outer rubber layer as disclosed in Patent Document 1 below. It has a structure having a braided reinforcing layer.

FIG. 8 (a) shows the structure of a refrigerant transport hose (air conditioner hose) disclosed in Patent Document 1 below, in which 200 is a cylindrical inner rubber layer, and an inner resin layer 202 is laminated on the inner side. Is formed.
A first reinforcing layer 204 is formed by spirally winding a reinforcing thread on the outer side of the inner rubber layer 200, and further, a reinforcing thread is spirally wound on the outer side via an intermediate rubber layer 206 in a direction opposite to the first reinforcing layer 204. The second reinforcing layer 208 is laminated, and the outer rubber layer 210 as the cover layer is laminated as the outermost layer.

This example is an example in which a reinforcing layer is formed by spiral braiding reinforcing yarn, but such a reinforcing layer is also formed by braiding a reinforcing yarn with a blade.
FIG. 8B shows an example thereof. In the figure, reference numeral 212 denotes a reinforcing layer formed by braiding reinforcing yarns, which is formed between the inner rubber layer 200 and the outer rubber layer 210.
A resin inner layer 202 is formed further inside the inner rubber layer 200.

As shown in these figures, the hose conventionally provided in a form having a reinforcing layer is a straight cylinder having a straight shape in the axial direction on both the inner surface and the outer surface.
By the way, in the case of such a straight cylindrical hose, a certain length is required in order to ensure good vibration absorption.

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, The required length for reducing the propagation of sound and vibration into the room is increased.
For example, in the case of a refrigerant transport hose, even if the length of the straight line that must be connected is 200 mm, vibration absorption, sound, and vibration propagation are generally performed using a hose having a length of 300 to 600 mm. We are reducing.

  However, various devices and parts are incorporated in the engine room, and in recent years, the engine room has become more and more compact in recent years. If the hose length is long, piping design to avoid interference with others and handling when installing the hose will be a difficult task, and the piping design and handling for each model must be devised. It is a big burden.

For this reason, development of a hose that has a short hose length and can absorb vibrations satisfactorily has been demanded.
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.
The point which provides a bellows part in the fuel type | system | group hose of a motor vehicle is disclosed by the following patent document 2. FIG.

FIG. 9 shows the fuel system hose disclosed in Patent Document 2, in which 213 is a cylindrical rubber layer, and 214 is a resin inner layer formed on the inner surface thereof.
As shown in the figure, the fuel system hose is provided with a bellows portion 216.
Therefore, in the case of this fuel system hose, vibration can be absorbed based on the flexibility of the bellows part 216.

However, the hose in this example is used as a fuel hose, called a filler hose, and pressure resistance is not particularly required, and its burst pressure is less than 1 MPa.
Therefore, such a hose structure cannot be directly applied to a hose that requires pressure resistance.

Japanese Patent Laid-Open No. 7-68659 JP 2001-74174 A

  In view of such circumstances, the present invention has been made for the purpose of providing a pressure-resistant vibration absorbing hose that is excellent in pressure resistance and vibration-absorbing properties and that can shorten the length of the hose.

  Thus, the pressure-resistant vibration absorbing hose of the present invention forms a reinforcing layer by wrapping a reinforcing cloth around the outer surface side of the cylindrical inner rubber layer having the bellows portion, and the bellows portion is a mountain portion adjacent to the longitudinal direction of the hose. And the troughs are discontinuous and independent from each other, and annular rigid restraining rings that are independent from each other in the longitudinal direction of the hose from the outside of the reinforcing layer are fitted in the outer fitting state. The valley portion is worn and restrained in the radial direction (Claim 1).

  According to a second aspect of the present invention, in the first aspect, the reinforcing cloth is a cloth formed by braiding warp and weft yarns, and the reinforcing cloth is placed on the outer surface of the inner rubber layer so that the warp is oriented in the hose longitudinal direction. It is characterized by being wound in a sushi-wound state on the side.

  A third aspect of the present invention is the cloth according to the first aspect, wherein the reinforcing cloth is a cloth formed by braiding warps and wefts, and the reinforcing cloth is placed in a state in which the warps and wefts are inclined and oriented in the hose longitudinal direction. It is characterized by being spirally wound on the outer surface side of the inner rubber layer.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the thickness of the peak portion of the bellows portion in the inner rubber layer is greater than the thickness of the valley portion.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the burst pressure is 1 MPa or more.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a cover layer is laminated outside the reinforcing layer.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, a piping hose disposed in an engine room of an automobile.

Effects and effects of the invention

  As described above, the present invention configures a reinforcing layer by winding a reinforcing cloth around the outer surface side of a cylindrical inner rubber layer having a bellows portion, and at the valley portion of the bellows portion and from the outside of the reinforcing layer in the longitudinal direction of the hose. The annular rigid restraining rings which are independent from each other are fitted in the outer fitting state, and the troughs are restrained in the radial direction and reinforced.

According to the present invention, good flexibility of the hose can be ensured by the bellows part. Therefore, even when the hose length is shortened, good vibration absorbability can be ensured.
That is, according to the present invention, the length of the hose can be shortened while ensuring good vibration absorption, and in particular, pressure resistance is required particularly in a piping hose disposed in an engine room of an automobile. In the piping hose, it becomes possible to solve the problems of piping design and routing when the hose is attached.
Furthermore, since the length of the hose can be shortened, there is an advantage that the degree of freedom of layout in piping is increased.

In addition, it is possible to provide good pressure resistance and deformation resistance by a reinforcing layer made of a reinforcing cloth and a rigid restraining ring.
That is, in the present invention, the pressure resistance strength and deformation resistance of the hose can be enhanced by receiving a load due to the internal pressure of the hose by the reinforcing layer and the restraining ring constituted by the reinforcing cloth.

  Moreover, in this invention, a trough part will be in a constrained state in a diameter-expanding direction with the restraint ring fitted by the outer fitting state on the outer side of the trough part. Thus, if the expansion and deformation of the valley portion is prevented, the expansion and deformation of the peak portion in the radial direction is also effectively suppressed.

In the present invention, there is also an advantage that the restraining ring fitted from the outside of the reinforcing layer can be used as the fixing means for the reinforcing layer.
Furthermore, in the present invention, since the restraint rings fitted to the outside of the reinforcing layer in the valleys are not connected to each other in the hose longitudinal direction, even if any restraint ring may break, As in the case of reinforcing with a constraining ring of a continuous form in the hose longitudinal direction, there is also an advantage that the constraining action on the plurality of troughs is not lost over a certain hose length due to the breakage.
According to the present invention, it is possible to ensure both excellent vibration absorption, pressure resistance and deformation resistance.

In the present invention, the reinforcing layer can be constituted by winding the reinforcing cloth around the outer surface side of the inner rubber layer in a state in which the warp is oriented in the longitudinal direction of the hose.
In this case, it is possible to satisfactorily suppress the hose from extending and deforming in the longitudinal direction by the warp in the reinforcing cloth.
Moreover, it is possible to favorably suppress the hose from expanding and deforming in the radial direction by the weft.
Moreover, when a reinforcing layer is formed by winding the reinforcing cloth in a sushi-wound state, the winding workability is good, the hose productivity can be increased, and the processing cost can be kept low.

On the other hand, in the present invention, the reinforcing layer can also be configured by spirally winding a reinforcing cloth around the outer surface side of the inner rubber layer.
Even in this case, the reinforcing layer can be easily provided on the outer surface side of the inner rubber layer.
However, when the reinforcing cloth is spirally wound in this way, it is necessary to rotate the winding device around the inner rubber layer. However, this is not the case with the sushi winding according to claim 2, and the reinforcing layer is formed in this way. Is easy.

In the case of spiral winding, if the hose extends in the longitudinal direction, a torsional stress may occur on the hose.
On the other hand, in the case of the above-described sushi winding, such a torsional stress does not occur. In this sense, it can be said that the reinforcement layer formation by sushi winding is superior to the formation of the reinforcement layer by spiral winding.

Next, according to the fourth aspect of the present invention, the thickness of the peak portion in the bellows portion is made thicker than the thickness of the valley portion, thereby suppressing the elongation deformation in the longitudinal direction of the hose during the action of internal pressure and the like better. Can do.
When the bellows part extends in the longitudinal direction, the trough part expands its diameter while widening its opening angle, and the peak part also tries to reduce its diameter while widening its angle. That is, the bellows part tends to extend in the longitudinal direction with the diameter of the valleys and the diameter of the peaks.

However, in the case of the hose of the present invention in which the restraint ring is fitted to the outside of the trough, the trough is restrained in the diameter increasing direction by the restraint ring, and the hose is stretched and deformed with the expansion of the trough. It is suppressed.
On the other hand, the peak portion is not restrained by a restraint ring like the valley portion, but if the thickness of the peak portion is increased according to claim 4, the deformation resistance of the peak portion becomes large, and the hose during the internal pressure action as a whole becomes large. The elongation deformation in the longitudinal direction can be effectively suppressed.

The present invention is particularly effective when applied to a hose that requires a pressure resistance with a burst pressure of 1 MPa or more (Claim 5).
The pressure-resistant vibration absorbing hose of the present invention can be configured in a form in which a cover layer is laminated on the outside of the reinforcing layer. The cover layer here can preferably consist of an outer rubber layer.
Furthermore, the present invention is particularly effective when applied to a piping hose disposed in an engine room of an automobile (claim 7).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2, reference numeral 10 denotes a pressure-resistant vibration absorbing hose (hereinafter simply referred to as a hose) used as, for example, a refrigerant transport hose (air conditioner hose). The bellows portion 12 and the straight cylindrical end portion 14 constitute almost the whole. And have.
The hose 10 has a laminated structure of a cylindrical inner rubber layer 16, an outer reinforcing layer 18 and an outer rubber layer 20 as an outermost cover layer.

  In the hose 10, the inner rubber layer 16 is made of a single material such as IIR, halogenated-IIR (Cl-IIR, Br-IIR), NBR, CR, EPDM, EPM, FKM, ECO, silicon rubber, urethane rubber or the like. Materials can be used.

  However, for the inner rubber layer 16, an appropriate material is selected and used in accordance with the fluid flowing through the inside. In the case of an HFC-based refrigerant transport hose, an IIR or halogenated-IIR single material or a blend material is particularly preferable.

Further, PET, PEN, aramid, PA (polyamide), vinylon, rayon, or the like can be used as a reinforcing cloth 18A to be described later constituting the reinforcing layer 18.
Further, as the outer rubber layer 20, various rubber materials listed in the inner rubber layer 16 can be used, but other than that, a heat shrinkable tube or a thermoplastic elastomer (TPE) can also be used. Acrylic, styrene, olefin, diolefin, vinyl chloride, urethane, ester, amide, fluorine, and the like can be used.
In this embodiment, the hose 10 has an inner diameter of about 5 to 50 mm.

In this embodiment, the reinforcing layer 18 is formed by winding a reinforcing cloth 18A formed by braiding warp yarns 18A-1 and weft yarns 18A-2 around the outer surface of the inner rubber layer 16, as shown in FIG.
In this configuration, the reinforcing fabric 18A is wound around the outer surface of the inner rubber layer 16 in a squeezed state so that the warp yarn 18A-1 is oriented in the longitudinal direction of the hose and the weft yarn 18A-2 is oriented in a direction perpendicular to the hose. .
Specifically, the reinforcing cloth 18A is wound around the inner rubber layer 16 in an annular shape along the circumferential surface so that a winding angle does not substantially occur with respect to the inner rubber layer 16.

  Further, in this embodiment, the bellows shape in the bellows portion 12 does not form a spiral shape continuous in the hose longitudinal direction, and each of the peak portion 22 and the valley portion 24 of the bellows portion in the inner rubber layer 16 is adjacent to the hose longitudinal direction. They are discontinuous and independent from each other.

As shown in FIG. 2, a rigid metal restraining ring (which may be made of resin) 26 is fitted from the outside of the reinforcing layer 18 to the outer surface of the inner rubber layer 16 for each valley 24. The valleys 24 are restrained and reinforced in the diameter-expanding direction by the restraining ring 26.
Here, the constraining ring 26 has an annular shape corresponding to the circular shape of the outer peripheral surface of each trough 24, and the constraining rings 26 are discontinuous with each other in the troughs 24 adjacent to each other in the longitudinal direction of the hose. In the form.

  As shown in FIG. 3 (III), the restraining ring 26 is fitted on the valley 24 of the inner rubber layer 16 from the outside of the reinforcing layer 18 by fitting a restraining ring having a cut 28 at a predetermined position in the circumferential direction. By welding the cut, an endless ring with no cut is finally formed.

However, in some cases, an endless annular ring having no cut 28 from the beginning is used as the restraining ring 26, and this is inserted in the trough 24 by being externally inserted from the outer side of the reinforcing layer 18 to the inner rubber layer 16. You can also do it.
Alternatively, the constraining ring 26 is formed by bending a wire having a circular or rectangular cross section, such as a wire, in an annular shape along the outside of each trough 24, and bending both ends radially outward to form a pair of constraining pieces. In addition, a cover for fitting the pair of restraining pieces can be provided, or the pair of restraining pieces can be twisted together.
As the metal restraining ring 26, for example, those made of SUS or SUP can be suitably used.

The hose 10 shown in FIGS. 1 and 2 can be manufactured as follows, for example.
That is, first, the inner rubber layer 16 having the bellows portion shown in FIG. 3I is formed by injection molding, blow molding or the like.

Subsequently, as shown in FIG. 3 (II), the reinforcing cloth 18A is wound around the outer surface of the molded inner rubber layer 16 in a squeezed state so that the warp yarn 18A-1 is oriented in the longitudinal direction of the hose as described above. Further, as shown in FIG. 3 (III), a constraining ring 26 having a cut 28 is externally fitted to the inner rubber layer 16 from the outer side to the inner rubber layer 16 as shown in FIG. Go.
Then, the cut 28 of the restraining ring 26 fitted outside is closed by welding.

As described above, the reinforcing fabric 18A is wound around the outer surface of the inner rubber layer 16, and the restraint ring 26 is further fitted, and then dipped in the dipping liquid for the outer rubber layer 20, and the outermost layer outside the outer layer. The rubber layer 20 is formed into a coating, which is then placed in a drying oven and dried.
Thereby, the hose 10 shown in FIGS. 1 and 2 can be obtained.

  Incidentally, the inner rubber layer 16 molded as shown in FIG. 4 is extrapolated to a plurality of long mandrels 29, and a long reinforcing cloth 18A is arranged on the outer surface along the longitudinal direction of the hose, for example, in the drawing. The reinforcing layer 18 is formed by winding it rightward in a squeeze state, and after the constraining ring 26 is fitted in the same manner as described above, this is continuously dipped in the dipping liquid for the outer rubber layer 20 and is placed on the outside. It is also possible to manufacture the hose 10 by coating the outermost outer rubber layer 20, extracting the mandrel 29 after drying, and then cutting each hose 10.

According to the hose 10 of the present embodiment as described above, good flexibility can be ensured by the bellows portion 12, and thus good vibration absorption can be ensured even when the hose length is shortened. .
That is, the length of the hose can be shortened while ensuring good vibration absorption, thereby making it possible to solve the problems of piping design and handling when the hose is installed in the engine room of the automobile.
Furthermore, since the length of the hose can be shortened, the degree of freedom in layout when piping is increased.

Further, according to the hose 10 of the present embodiment, good pressure resistance and deformation resistance can be ensured by the reinforcing layer 18 and the restraining ring 26.
That is, the reinforcing layer 18 and the restraining ring 26 formed by winding the reinforcing cloth 18A around the outer surface of the inner rubber layer 16 can suppress the expansion deformation in the radial direction of the hose 10 due to internal pressure or the like, and also suppress the deformation in the longitudinal direction of the hose. be able to.

In this embodiment, the restraining ring 26 fitted to the valley 24 can also be used as a fixing means for the reinforcing layer 18.
Furthermore, since the restraining rings 26 fitted to the outside of the valley portion 24 are independent and not connected to each other in the longitudinal direction of the hose, even if any of the restraining rings 26 breaks, As in the case of reinforcing with a constraining ring in a continuous form, the restraint by the constraining ring is not lost over a certain hose length.

In this embodiment, the reinforcing fabric 18A is wound around the outer surface of the inner rubber layer 16 so that the warp yarns 18A-1 are oriented in the longitudinal direction of the hose. With the warp yarn 18A-1, the hose 10 can be satisfactorily prevented from extending and deforming in the longitudinal direction. Moreover, it is possible to satisfactorily suppress the hose 10 from expanding and deforming in the radial direction by the weft 18A-2.
Further, when the reinforcing cloth 18A is wound in a squeezed state to form the reinforcing layer 18 as described above, the winding workability is good, the productivity of the hose 10 can be increased, and the processing cost can be kept low.

〔Example〕
Hose having various configurations shown in Table 1 was manufactured, and burst pressure (pressure resistance) and vibration absorption were measured.
Here, in Table 1, that the number of reinforcement layers to be implanted in Comparative Example A is 4 alignments × 24 strokes means that four 2000 de (denier) reinforcement yarns are arranged side by side and braided with 24 carriers. Yes.

  Further, the number of reinforcement layers 22 to 22 in Comparative Example B indicates that 3000 de reinforcement yarns were spirally braided 22 on the inside and 22 on the outside with the intermediate rubber layer interposed therebetween.

  Further, the winding method of the reinforcing layer of the embodiment is the case of winding the reinforcing cloth according to FIGS. 1 to 4, and the spiral winding is the warp yarn 18A as shown in FIG. This is a case where the reinforcing layer 18 is configured by spirally winding the reinforcing cloth 18A around the outer surface of the inner rubber layer 16 in a state where the -1 and the weft yarn 18A-2 are inclined and oriented in the hose longitudinal direction.

  Moreover, the numerical value of the burst pressure represents the pressure when a pressure is reached by applying water pressure inside each hose and increasing the pressure at a pressure increase rate of 160 MPa / min.

On the other hand, the vibration absorbability was measured using a measuring apparatus 30 shown in FIG.
Specifically, each hose is set in the measuring device 30 and each end thereof is supported by the cored bar 32, and one end side is vibrated by the vibration device 34 and received at the other end side. The excitation acceleration A0 was measured at the measurement point P0, and the reception acceleration A1 was measured at the measurement point P1 on the reception side, and the transfer function was measured based on them. The result is shown in FIG.
In FIG. 5, 36 is a rubber, and 38 is a box-shaped surface plate.

  As shown in Table 1, in the case of the hose of this example, the burst pressure shows a high pressure resistance of about 4 MPa or more, and the hose length is much shorter than that of Comparative Example A. Regardless, FIG. 6 shows excellent vibration absorption.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, in the above embodiment, the thickness of the bellows peak portion 22 and the thickness of the valley portion 24 in the inner rubber layer 16 are equal, but the thickness of the peak portion 22 is not thicker than the thickness of the valley portion 24. You can also keep it.
If it does in this way, in addition to the expansion deformation of the hose 10 with the diameter expansion of the trough part 24 being suppressed by the effect | action of the restraint ring 26, deformation resistance also becomes large also in the peak part 22. FIG. As a whole, elongation deformation in the longitudinal direction of the hose 10 during the internal pressure action is effectively suppressed.

  Further, in the present invention, the cover layer such as the outermost outer rubber layer can be omitted depending on the case, and the present invention can be configured with various modifications depending on the purpose of use of the hose. The present invention can be configured in various forms without departing from the spirit of the present invention.

It is a perspective view which cuts off the hose of one Embodiment of this invention, and shows it with a reinforcement cloth. It is sectional drawing of the hose of FIG. It is explanatory drawing which shows the principal part process of the manufacturing method of the hose of FIG. It is explanatory drawing which shows the principal part process of the manufacturing method different from FIG. 3 of the hose of FIG. It is explanatory drawing which shows the measuring method of the vibration absorptivity of the hose of an Example and a comparative example with a measuring apparatus. It is a figure which shows the vibration absorptivity obtained by the measuring method of FIG. It is explanatory drawing which shows the principal part process of one manufacturing method in other embodiment of this invention. It is a figure which shows an example of a conventionally well-known hose. It is a figure which shows the example of a hose different from conventionally well-known FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hose 12 Bellows part 16 Inner rubber layer 18 Reinforcement layer 18A Reinforcement cloth 18A-1 Warp yarn 18A-2 Weft yarn 20 Outer rubber layer (cover layer)
22 Mountain part 24 Valley part 26 Restraint ring

Claims (7)

  A reinforcing cloth is formed by wrapping a reinforcing cloth around the outer surface side of the cylindrical inner rubber layer having the bellows portion, and the bellows portion is independent from each other with discontinuities between peaks and valleys adjacent to each other in the longitudinal direction of the hose. The ring-shaped bellows portion is constrained in a radially-fitted state by attaching annular rigid restraining rings that are independent of each other in the longitudinal direction of the hose from the outside of the reinforcing layer to the valley portion of the bellows portion. A pressure-resistant vibration absorbing hose characterized by that.   2. The reinforcing cloth is a cloth formed by braiding warp and weft, and the reinforcing cloth is wound around the outer surface side of the inner rubber layer so as to be oriented in the longitudinal direction of the hose. The pressure-resistant vibration absorbing hose described in 1.   The reinforcing cloth is a cloth formed by braiding warp and weft, and the reinforcing cloth is spirally wound around the outer surface side of the inner rubber layer so that the warp and weft are inclined and oriented in the hose longitudinal direction. The pressure-resistant vibration absorbing hose according to claim 1.   The pressure-resistant vibration absorbing hose according to any one of claims 1 to 3, wherein a thickness of the peak portion of the bellows portion in the inner rubber layer is thicker than a thickness of the valley portion.   The pressure-resistant vibration absorbing hose according to any one of claims 1 to 4, wherein the burst pressure is 1 MPa or more.   The pressure-resistant vibration absorbing hose according to any one of claims 1 to 5, wherein a cover layer is laminated outside the reinforcing layer.   The pressure-resistant vibration absorbing hose according to claim 1, which is a piping hose disposed in an engine room of an automobile.

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