JP4666429B2 - Rubber oil hose connection structure for engine oil cooler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure of a rubber hose for an engine oil cooler for connecting, for example, a rubber hose for an oil cooler that connects an engine of an automobile and an oil cooler to a metal pipe that forms an oil lead-in / out pipe provided in the oil cooler .
[0002]
[Prior art]
Conventionally, a rubber hose for an oil cooler that connects an automobile engine and an oil cooler is connected to an oil introduction part of the oil cooler via a metal connector made up of a plurality of members such as eye metal fittings (eye joints), washers, and fastening bolts. Was connected. In other words, the eye metal fitting has a nipple portion with one end inserted into the end portion of the rubber hose, the other end has a cylindrical shape orthogonal to the nipple portion, and the inner periphery of the nipple portion is communicated with the inner periphery of the cylindrical portion. . The nipple portion is inserted into the other end of the rubber hose and connected to the rubber hose by caulking a metal cylindrical caulking member disposed on the outer periphery of the rubber hose. In addition, washers are arranged above and below the cylindrical portion, and the rubber hose and the oil cooler are connected by screwing a fastening bolt inserted from one end of the cylindrical portion into the oil introduction portion.
[0003]
[Problems to be solved by the invention]
However, the conventional hose connection structure uses a metal connector composed of a plurality of members such as eye metal fittings, washers, and fastening bolts, which increases the number of parts, makes the connection work complicated, takes time, and reduces the weight of the automobile. There was a problem that it was against the development.
Accordingly, an object of the present invention is to provide a hose connection structure that requires only a small number of parts, has good connection workability, and can achieve weight reduction.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a connection of a rubber hose for an engine oil cooler for connecting the other end of a rubber hose for an oil cooler whose one end is connected to an engine to a metal pipe that forms an oil lead-in / out pipe of the oil cooler. In structure
The rubber hose is connected to the metal pipe via a resin connector,
The resin connector includes a housing having a nipple portion inserted into an end portion of the rubber hose and a holder portion into which an end portion of the metal pipe is inserted, and is disposed in the housing and engages with an outer peripheral protrusion of the metal pipe. A retainer, and an O-ring disposed on the inner periphery of the housing and pressed against the outer periphery of the metal pipe,
The rubber hose and the resin connector are connected by inserting the nipple portion of the resin connector into the end of the rubber hose and caulking a metal caulking member disposed on the outer periphery of the rubber hose,
The housing is a polyether sulfone having a glass transition temperature of 140 ° C. or higher, an initial tensile strength at 150 ° C. of 60 MPa or higher, and an initial bending elastic modulus at 150 ° C. of 6000 MPa or higher . polysulfone, polyketone, glass fiber reinforced resin mixed with glass fibers in a resin selected from polyether ether ketone Tona is,
The thickness / outer diameter ratio of the nipple part is 0.1 to 0.3,
The retainer is a initial tensile strength at 0.99 ° C. or higher 50 MPa, engine oil, characterized in that it consists of a glass fiber reinforced polyamide resin flexural modulus at ordinary temperature of 5000～9000MPa, mixed with glass fibers in polyamide resin A structure for connecting a rubber hose for a cooler is provided.
[0005]
According to the above invention, since the resin connector is connected to the end portion of the rubber hose and the end portion of the metal pipe is simply inserted into the resin connector, the metal pipe is engaged and connected to the retainer of the resin connector. The rubber hose can be connected to the metal pipe with a single touch, which greatly improves the connection workability. In addition, instead of using a metal connector consisting of a plurality of members such as an eyepiece metal fitting, a washer, and a tightening bolt, it is only necessary to use one pre-assembled resin connector, so that the number of parts can be reduced and costs can be reduced. Parts management is also easy.
[0006]
Further, since the housing is made of a resin material having a glass transition temperature of 140 ° C. or higher, an initial tensile strength at 150 ° C. of 60 MPa or higher, and an initial bending elastic modulus at 150 ° C. of 6000 MPa or higher, the rubber hose When the rubber hose and the resin connector are connected by caulking the metal caulking member disposed on the outer periphery, the nipple portion of the resin connector can be prevented from being damaged even if a strong caulking force is applied. In addition, even when high-temperature and high-pressure fluid flows inside, such as a rubber hose for an oil cooler, it is difficult for the outer diameter to change due to sag, etc., and the connection strength and sealing performance between the rubber hose and the resin connector can be maintained for a long time. Can be maintained.
[0007]
In addition, when the initial tensile strength at 150 ° C. of the resin material constituting the housing is less than 60 MPa, there is a problem that it cannot withstand the tensile force applied to the holder portion due to the pulling force of the metal pipe under high pressure. When the transition temperature is less than 140 ° C. and the initial flexural modulus at 150 ° C. is less than 6000 MPa, the resin connector-nipple portion is deformed (reduced diameter) at high temperatures, resulting in poor sealing performance with the rubber hose. There's a problem.
[0009]
In addition, when the ratio of the wall thickness / outer diameter of the nipple portion is 0.1 to 0.3, when connecting the rubber hose and the resin connector by caulking the metal caulking member disposed on the outer periphery of the rubber hose, Even if a strong caulking force is applied, the nipple portion of the resin connector can be more reliably prevented from being damaged. If the wall thickness is thinner than the above range, sufficient strength cannot be obtained to counter the caulking force. If the wall thickness is thicker than the above range, the inner diameter becomes relatively small. There is a problem that the area becomes narrow.
Furthermore, it is possible to connect the oil hose for the oil cooler to the oil cooler with a one-touch operation with a resin connector, and the rubber hose attached to the nipple portion of the resin connector is caulked with a metal caulking member, so that the high temperature Even when high-pressure oil flows inside, the connection state can be reliably maintained. In addition, instead of using a metal connector consisting of a plurality of members such as an eyepiece metal fitting, a washer, and a tightening bolt, it is only necessary to use one pre-assembled resin connector, so that the number of parts can be reduced and costs can be reduced. Parts management is also easy.
[0011]
Moreover, since the retainer is made of a resin material having an initial tensile strength at 150 ° C. of 50 MPa or more, the metal pipe is inserted into the resin connector, and the protrusion on the outer periphery of the metal pipe is engaged with the retainer of the resin connector. After connecting the rubber hose and the metal pipe through the resin connector, the retainer has sufficient tensile strength even if a strong pulling force acts between the retainer and the metal pipe due to the pressure of the fluid flowing inside the rubber hose. Therefore, damage is prevented. If the initial tensile strength at 150 ° C. of the resin material constituting the retainer is less than 50 MPa, there is a possibility that sufficient strength in the above case cannot be obtained.
[0013]
Further , since the initial tensile strength at 150 ° C. of the resin material constituting the retainer is 50 MPa or more, as described above, the retainer is sufficient even if a strong pulling force acts between the retainer and the metal pipe. Since it has a high tensile strength, it is prevented from being damaged. Moreover, since the bending elastic modulus at normal temperature of the resin material constituting the retainer is 5000 to 9000 MPa, the retainer is prevented from being damaged when the retainer is bent and incorporated into the housing. If the bending elastic modulus is less than 5000 MPa, there is a problem that sufficient strength for holding the metal pipe cannot be obtained, and if it exceeds 9000 MPa, there is a problem that insertion into the housing becomes difficult.
[0014]
The second of the present invention, Oite to the first aspect of the present invention, the O-ring is formed of a combination of those made of a material excellent in oil resistance at high temperatures, and made of a material excellent in flexibility at low temperatures A rubber hose connection structure for an engine oil cooler is provided.
[0015]
According to the above invention, when the fluid flowing inside is oil and it is high temperature, the sealing performance is secured by the O-ring made of a material excellent in oil resistance at high temperature, and when the oil is low temperature, it is flexible at low temperature. Sealability is ensured by an O-ring made of a material having excellent properties. For this reason, even if the temperature of the oil flowing through the interior varies depending on the ambient temperature of the automobile and the driving state, a highly reliable sealing performance can be obtained.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 to 5 show an embodiment of a hose connection structure according to the present invention. FIG. 1 is a front view showing a state in which an oil cooler and a rubber hose are connected via a resin connector. FIG. 2 is a perspective view showing a state where a resin connector is connected to the rubber hose. 3A and 3B show a resin connector, in which FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a cross-sectional view taken along the line CC ′ in FIG. FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV ′ of FIG. 3C, showing a state where a metal pipe is inserted into the resin connector. FIG. 5 is an explanatory view showing a procedure for connecting the rubber hose to the resin connector.
[0019]
As shown in FIG. 1, the oil cooler 10 has an oil introduction part 11 and an oil lead-out part 12, and a metal pipe 13 is attached to each of them. The metal pipe 13 communicates with the oil inlet and the oil outlet of the oil cooler 10, and has an annular protrusion 13a on the outer periphery thereof. Further, one end of the rubber hose 20 is connected to each of the metal pipes 13 via the resin connector 30. The other end of the rubber hose 20 is connected to an oil introduction part and a lead-out part of the engine (not shown).
[0020]
That is, the other end of the lower rubber hose 20 in FIG. 1 is connected to an oil lead-out part of the engine, and oil is introduced from the oil introduction part 11 to the oil cooler 10 through the metal pipe 13. Further, the other end of the upper rubber hose 20 in FIG. 1 is connected to an oil introduction part of the engine so that oil flowing out from the oil lead-out part 12 of the oil cooler 10 through the metal pipe 13 is sent to the oil introduction part of the engine. It has become.
[0021]
As shown in FIGS. 2 and 3, the resin connector 30 includes a housing 33 having a nipple portion 31 inserted into an end portion of the rubber hose 20 and a holder portion 32 into which the metal pipe 13 is inserted, and a holder portion 32 of the housing 33. And the two O-rings 51 and 52 disposed on the inner periphery of the holder portion 32 via the spacer 50.
[0022]
The nipple portion 31 of the housing 33 has a plurality of annular concave portions 31a and convex portions 31b formed on the outer periphery thereof, and a tapered portion 31c formed at the tip. The nipple portion 31 is connected to the rubber hose 20 by being inserted into the end portion of the rubber hose 20 and then caulking a cylindrical metal caulking member 21 disposed on the outer periphery of the rubber hose 20.
[0023]
That is, as shown in FIG. 5A, a metal cylindrical caulking member 21 is attached to the end of the rubber hose 20. The caulking member 21 has an annular rib 21a at one end, and the end of the rubber hose 20 is engaged. The nipple portion 31 of the resin connector 30 is inserted into the end portion of the rubber hose 20 through the hole of the rib 21a of the caulking member 21.
[0024]
Next, as shown in FIG. 5 (b), the outer circumference of the caulking member 21 is caulked to reduce the diameter so that the rubber hose 20 is pressed against the outer circumference of the nipple portion 31 by the caulking member 21, and the rubber hose 20 and the nipple portion 31 are firmly connected. To join. Note that the caulking member 21 has a particularly strong caulking portion corresponding to the recess 31 a of the nipple portion 31, and the coupling force is increased by causing the rubber hose 20 to bite into the recess 31 a of the nipple portion 31.
[0025]
As shown in FIGS. 3 and 4, the holder portion 32 of the housing 33 of the resin connector 30 is formed with through holes 34 at four locations on the peripheral wall thereof. The retainer 40 includes a cylindrical base 41 and four elastic pieces 42, 42, 43, 43 extending from the base 41 in the axial direction. The retainer 40 is incorporated in the housing 33 with the base 41 abutting on the inner periphery of the housing 33 and the four elastic pieces 42, 42, 43, 43 fitted in the through holes 34. . Of the four elastic pieces, the pair of opposing elastic pieces 42, 42 has a gripping piece 42a for finger pressing at the rear end. Further, an engagement groove 43a into which the annular protrusion 13a of the metal pipe 13 is fitted is formed on the inner periphery of the other pair of opposing elastic pieces 43, 43. Furthermore, tapered walls 42b and 43b having a gradually decreasing diameter are provided at the tip portions of the four elastic pieces 42, 42, 43 and 43, respectively.
[0026]
Two O-rings 51 and 52 are arranged on the inner periphery of the holder portion 32 of the housing 33 of the resin connector 30 via a spacer 50. Among these, one O-ring 51 is made of a material excellent in oil resistance at a high temperature, and the other O-ring 52 is made of a material excellent in flexibility at a low temperature. As the O-ring made of a material excellent in oil resistance at a high temperature, one that can be sealed against an internal pressure of 9.8 MPa even after being immersed in engine oil at 150 ° C. for 1000 hours is preferable. Preferably used. The O-ring made of a material having excellent flexibility at low temperatures is preferably one that can be sealed against an internal pressure of 9.8 MPa at a temperature of −40 ° C., for example, one made of fluorosilicone rubber is preferably used. The
[0027]
When the metal pipe 13 is inserted into the resin connector 30, as shown in FIG. 4, the annular protrusion 13a of the metal pipe 13 abuts against the tip of the elastic pieces 43, 43, while bending the elastic pieces 43, 43 outward. The protrusion 13a engages with the engaging groove 43a. In this state, when the metal pipe 13 is pulled out, the retainer 40 is displaced in that direction, and the tapered walls 42 b, 43 b at the tips of the elastic pieces 42, 43 of the retainer 40 are fitted into the inner periphery of the opening of the housing 33. To obtain a strong fixing force. Further, when it is desired to remove the metal pipe 13, when the retainer 40 is moved to the back of the housing (the metal pipe 13 is pressed to the back), the metal pipe 13 is pulled out while holding the grip piece 42a of the elastic piece 42. The elastic piece 43 opens to the outside through the through hole 34, and the annular protrusion 13a of the metal pipe 13 is detached from the engagement groove 43a, so that the metal pipe 13 can be pulled out.
[0028]
Next, the material of the housing 33 will be described. As described above, the rubber hose 20 is pressure-bonded to the nipple portion 31 of the housing 33 by the metal caulking member 21, so that the nipple portion 31 of the resin housing 33 is resistant to it. Strong strength is required. In addition, when applied to the connection of a rubber hose 20 for an oil cooler, high-temperature and high-pressure oil flows inside, so that a sufficient sealing performance is required after a long period of use. The Furthermore, the holder portion 32 of the housing 33 needs to have a strength that opposes the pulling force of the metal pipe 13 under high pressure.
[0029]
For these reasons, the housing 33 is made of a resin material having a glass transition temperature of 140 ° C. or higher, an initial tensile strength at 150 ° C. of 60 MPa or higher, and an initial flexural modulus at 150 ° C. of 6000 MPa or higher. Is preferably used. When the initial tensile strength at 150 ° C. is 60 MPa or more, it is possible to withstand the tensile force applied to the holder portion 32 due to the pulling force of the metal pipe 13 under high pressure. In addition, since the glass transition temperature is 140 ° C. or higher and the initial flexural modulus at 150 ° C. is 6000 MPa or higher, the diameter of the nipple portion 31 is reduced even after being used for a long time under high temperature and high pressure. The pressure-bonding force of the rubber hose 20 can be maintained over a long period of time without causing the above.
[0030]
In addition, the tensile strength in this invention means the tensile strength measured according to ASTM D-638, and the bending elastic modulus means the bending elastic modulus measured according to ASTM D-790. The glass transition temperature is a value measured by DSC (differential scanning calorimeter).
[0031]
As a material that satisfies these conditions, for example, a reinforced resin material in which a reinforcing material such as glass fiber is mixed with a resin such as polyethersulfone, polysulfone, polyketone, or polyetheretherketone is preferably used. Specifically, “Radel AG330” (trade name, manufactured by Amoco Engineering Polymers Co., Ltd., 33% glass fiber), which is a polyether fiber reinforced polyethersulfone, may be mentioned.
[0032]
Further, the nipple portion 31 of the housing 33 has a thickness / outer diameter ratio of 0.1 to 0.1 for imparting strength when caulking the metal caulking member 21 and preventing sag under high temperature and pressure. It is preferable that it is 0.3.
[0033]
Next, the material of the retainer 40 will be described. The retainer 40 is subjected to a force for pulling out the metal pipe 13 as shown by an arrow A in FIG. A strong tensile force acts on the engaging portion. For this reason, what has sufficient tensile strength is desired. On the other hand, in order to incorporate the retainer 40 into the housing 33, the elastic pieces 42 and 43 of the retainer 40 must be inserted into the housing 33 while being bent inward to reduce the diameter. For this reason, if the bending elastic modulus is too high, insertion becomes difficult. On the other hand, if the bending elastic modulus is too low, sufficient strength for holding the metal pipe 13 cannot be obtained.
[0034]
For this reason, the retainer is preferably made of a resin material having an initial tensile strength at 150 ° C. of 50 MPa or more and a flexural modulus at room temperature of 5000 to 9000 MPa. As such a resin material, for example, a semi-aromatic nylon or a reinforcing resin material in which a reinforcing material such as glass fiber is mixed with a polyamide resin such as nylon 46 is preferably used. For example, glass fiber-reinforced semi-aromatic nylon is used. Amodel A-1125HS "(trade name, manufactured by Amoco Engineering Polymers Co., Ltd., 25% glass fiber).
[0035]
According to the hose connection structure which is one embodiment of the present invention using the resin connector 30 having the above-described configuration, the metal connector 21 can be connected by caulking while being a resin connector. A strong connection is possible. And by simply inserting the metal pipe 13 into the resin connector 30, the rubber hose 20 and the metal pipe 13 can be connected with a single touch, the workability can be dramatically improved, the number of parts can be reduced, and the cost can be reduced. Parts management can be facilitated.
[0036]
Further, even when high-temperature and high-pressure oil flows inside, the nipple portion 31 of the housing 30 does not shrink and the connection strength with the rubber hose 20 can be maintained for a long time. Further, even if a high-temperature and high-pressure oil flows inside and a strong force acts to pull out the metal pipe 13, sufficient strength can be imparted without damaging the housing 30 and the retainer 40. Furthermore, when the retainer 40 is assembled to the housing 30, there is no possibility that the retainer 40 is damaged.
[0037]
Further, the two O-rings 51 and 52 disposed between the metal pipe 13 and the housing 30 are made of a material excellent in oil resistance at high temperatures and a material excellent in flexibility at low temperatures. Because of the combination, the sealing performance can always be maintained even when the oil flowing inside is at high temperature and high pressure, or at low temperatures such as below freezing.
[0038]
Various types of resin connectors have already been commercially available, and the present invention can be applied to these commercially available resin connectors having various structures. The structures of the housing, retainer, and the like are the same as those in the above embodiment. Needless to say, it is not limited to.
[0039]
【Example】
(Example 1)
The resin connector 30 having the structure shown in FIGS. 1 to 5 was connected to the rubber hose 20 by the metal caulking member 21, and the rubber hose 20 was connected to the metal pipe 13 of the oil cooler 10 through the resin connector 30.
[0040]
As a material of the housing 33 of the resin connector 30, “Radel AG330” (trade name, manufactured by Amoco Engineering Polymers Co., Ltd., 33% glass fiber) which is a glass fiber reinforced polyethersulfone was used. The “Radel AG330” has a glass transition temperature of 220 ° C., a flexural modulus at 150 ° C. of 7100 MPa, and a tensile strength at 150 ° C. of 68 MPa. The nipple portion 31 of the housing 33 has a thickness of 1.2 mm, an outer diameter of φ9.4 mm, and a thickness / outer diameter ratio of 0.128.
[0041]
As the retainer 40 of the resin connector 30, “Amodel A-1125HS” (trade name, manufactured by Amoco Engineering Polymers Co., Ltd., 25% glass fiber), which is a glass fiber reinforced semi-aromatic nylon, was used. The “Amodel A-1125HS” has a tensile strength at 150 ° C. of 67 MPa and a flexural modulus at room temperature of 7600 MPa.
[0042]
As the O-ring, the O-ring 51 on the back side is made of fluororubber, and the O-ring 52 on the near side is made of fluorosilicone.
[0043]
(Example 2)
In Example 1 above, “Zytel 70G33HSL” (trade name, manufactured by DuPont, 33% glass fiber), which is glass fiber reinforced nylon 66, was used as the material of the housing 33 of the resin connector 30. The “Zytel 70G33HSL” has a glass transition temperature of 78 ° C. (absolutely dry), a flexural modulus at 150 ° C. of 4000 MPa, and a tensile strength at 150 ° C. of 80 MPa. For other conditions, a resin connector was prepared in the same manner as in Example 1, and the rubber hose 20 was connected to the metal pipe 13 of the oil cooler 10 via this resin connector.
[0044]
(Example 3)
In Example 1 above, “Amodel AS-1566” (trade name, manufactured by Amoco Engineering Polymers, glass fiber / inorganic filler blend), which is a reinforced semi-aromatic nylon, was used as the material of the housing 33 of the resin connector 30. The “Amodel AS-1566” has a glass transition temperature of 124 ° C., a flexural modulus at 150 ° C. of 4100 MPa, and a tensile strength at 150 ° C. of 83 MPa. For other conditions, a resin connector was prepared in the same manner as in Example 1, and the rubber hose 20 was connected to the metal pipe 13 of the oil cooler 10 via this resin connector.
[0045]
Test Example Using the resin connectors in Examples 1 to 3 above, the resin connectors are connected to both ends of the rubber hose by a metal caulking member, 150 ° C. engine oil is sealed in the rubber hose and loaded for 144 hours, and then the metal caulking member is removed. The deformation amount (reduction amount) of the nipple portion of the resin connector was measured. The amount of deformation is determined by measuring the outer diameters in two directions that are different by 90 degrees in the concave portion 31a and the convex portion 31b of the nipple portion, and obtaining the difference between the initial outer diameter and the outer diameter after the oil filling process. The average was calculated. The experiment was performed using two samples.
[0046]
As a result, Example 1 had an average deformation amount of 0.004 mm, Example 2 had an average deformation amount of 0.3 mm, and Example 3 had an average deformation amount of 0.14 mm. Thus, the housing is made of a material having a glass transition temperature of 140 ° C. or higher, an initial tensile strength at 150 ° C. of 60 MPa or higher, and an initial bending elastic modulus at 150 ° C. of 6000 MPa or higher. It can be seen that, even when used for a long time under high-temperature and high-pressure conditions, the nipple portion does not easily sag, and a reliable sealing property with the rubber hose is maintained.
[0047]
(Example 4)
In Example 1, as the retainer 40 of the resin connector 30, “Amodel A-1133HS” (trade name, manufactured by Amoco Engineering Polymers Co., Ltd., 33% glass fiber), which is a glass fiber reinforced semi-aromatic nylon having a different glass fiber content. ) Was used. The “Amodel A-1133HS” has a tensile strength at 150 ° C. of 75 MPa and a flexural modulus at room temperature of 11400 MPa.
[0048]
As for other conditions, a resin connector was prepared in the same manner as in Example 1. As a result, the retainer 40 was damaged when the retainer 40 was assembled to the housing 33.
[0049]
【The invention's effect】
As described above, according to the present invention, the resin pipe is connected to the end of the rubber hose, and the metal pipe is engaged with the retainer of the resin connector simply by inserting the end of the metal pipe into the resin connector. Therefore, the rubber hose can be connected to the metal pipe with a single touch, and the connection workability is greatly improved. In addition, instead of using a metal connector consisting of a plurality of members such as an eyepiece metal fitting, a washer, and a tightening bolt, it is only necessary to use one pre-assembled resin connector, so that the number of parts can be reduced and costs can be reduced. Parts management is also easy.
[Brief description of the drawings]
FIG. 1 is a front view showing a state in which an oil cooler and a rubber hose are connected via a resin connector, which is an embodiment of a hose connection structure according to the present invention.
FIG. 2 is a perspective view showing a state in which a resin connector is coupled to a rubber hose in the hose connection structure.
3A and 3B show a resin connector in the hose connection structure, wherein FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a cross-sectional view taken along the line CC ′ of FIG.
FIG. 4 is an enlarged cross-sectional view taken along line IV-IV ′ of FIG. 3C, showing a state where a metal pipe is inserted into the resin connector.
FIG. 5 is an explanatory diagram showing a procedure for connecting a rubber hose to a resin connector in the hose connection structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Oil cooler 13 Metal pipe 13a Annular protrusion 20 Rubber hose 21 Metal caulking member 30 Resin connector 31 Nipple part 32 Holder part 33 Housing 40 Retainer 50 Spacer 51, 52 O-ring

Claims (2)

In the connection structure of the rubber hose for the engine oil cooler for connecting the other end of the rubber hose for the oil cooler that is connected to the engine to the metal pipe that forms the oil lead-in / out pipe of the oil cooler ,
The rubber hose is connected to the metal pipe via a resin connector,
The resin connector includes a housing having a nipple portion inserted into an end portion of the rubber hose and a holder portion into which an end portion of the metal pipe is inserted, and is disposed in the housing and engages with an outer peripheral protrusion of the metal pipe. A retainer, and an O-ring disposed on the inner periphery of the housing and pressed against the outer periphery of the metal pipe,
The rubber hose and the resin connector are connected by inserting the nipple portion of the resin connector into the end of the rubber hose and caulking a metal caulking member disposed on the outer periphery of the rubber hose,
The housing is a polyether sulfone having a glass transition temperature of 140 ° C. or higher, an initial tensile strength at 150 ° C. of 60 MPa or higher, and an initial bending elastic modulus at 150 ° C. of 6000 MPa or higher . polysulfone, polyketone, glass fiber reinforced resin mixed with glass fibers in a resin selected from polyether ether ketone Tona is,
The thickness / outer diameter ratio of the nipple part is 0.1 to 0.3,
The retainer is a initial tensile strength at 0.99 ° C. or higher 50 MPa, engine oil, characterized in that it consists of a glass fiber reinforced polyamide resin flexural modulus at ordinary temperature of 5000～9000MPa, mixed with glass fibers in polyamide resin Connection structure of rubber hose for cooler . 2. The rubber hose connection structure for an engine oil cooler according to claim 1 , wherein the O-ring is made of a combination of a material made of a material excellent in oil resistance at a high temperature and a material made of a material excellent in flexibility at a low temperature.

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