JP2001004084A - Tube joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a resin tube from slipping off by thermal deterioration as well as when bending force is acted on the connected resin tube. SOLUTION: A body part 10 has a shaft hole 11 provided with holes 11a, 11b, 11c whose diameter sizes are shortened gradually step by step toward the other end of an axial direction. An annular rib 20 is fixed to an inside of the hole 11a, a cylindrical holder 30 provided with a guide inner circumferential surface 31a and a restricting recessed taper surface 31b is fitted and fixed to an inlet side of the hole 11a, an annular recessed part 7 is formed between the rib 20 and the restricting recessed taper surface 31b. A fastening part 52 of the fastening member 50 and a continuously and extendedly arranged part is movably held in the axial direction. The fastening member 50 is provided with a cylindrical base part, a plurality of arm parts capable of elastically deforming and which is provided with a cutout having a clearance in the circumferential direction toward the other end side of the axial direction from the base part, and the fastening part 52 which is annually disposed on a free end of the arm parts. The base part is movably mounted in the axial direction in a guide inner circumferential surface 31a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-assembled tube coupling in which the end of the tube is simply inserted. For example, the present invention relates to a tube joint that can be suitably used for piping of an automobile air brake or the like.

[0002]

2. Description of the Related Art Conventionally, as a tube joint of this type,
The one described in JP-A-9-133273 is known. That is, as shown in FIG. 8, the tapered surface portion 4 whose diameter is reduced toward the tube insertion port side and the inner peripheral surface portion 5 which extends from the tapered surface portion 4 whose diameter is reduced toward the tube insertion port side are formed on the inner periphery thereof. And a tightening member 8 housed in the joint main body 3 so as to be movable in the axial direction and engaged with the tapered surface portion 4 during the movement. One end of the tightening member 8 is provided. When the fluid pressure and / or tension acts while the tube T is inserted into the tightening member 8, the tightening member 8 engaged with the tapered surface portion 4 is pressed and reduced in diameter, so that the tube T Is tightened, and the tightening member 8 is moved to the tube insertion port side to be locked with the joint main body 3. When the tightening member 8 and the joint main body 3 are locked in the axial direction, tightening is performed. The member 8 is the inner circumference The diameter of the tightening member 8 is reduced such that the tube T is connected to the tube 5 in an optimal retaining state in a state where the diameter of the tube T is shifted to the inside of the portion 5 and the diameter of the tightening member 8 is reduced most in the inner peripheral surface portion 5. Is set.

More specifically, one end of the second tubular member 2 of the tubular joint main body 3 is provided with a radially protruding flange portion, which slides against an inner peripheral locking portion 13 of the flange portion. A clamping member 8 having a movable outer peripheral surface has a contact claw having a protruding portion 9 protruding radially outward from the outer peripheral surface and an engaging claw 10 protruding inward on the inner peripheral surface at the other end. An annular outer peripheral locking portion 14 is provided and is provided in front of the contact claw with a distance so as to protrude radially outward from the outer peripheral surface.

When a fluid pressure and / or tension acts on one end of the tightening member 8 with the tube T inserted into the tightening member 8, the tightening member 8 engaged with the tapered surface portion 4 is pressed. As the diameter of the tube T is reduced, the tube T is optimally tightened, and the tightening member 8 is moved to the tube insertion port side to be locked with the joint main body 3.

[0005]

However, in such a resin tube joint, a cavity is formed in the inner peripheral surface portion 5 of the joint main body portion between the abutment claw of the tightening member 8 and the annular outer peripheral locking portion 14, so that a resin tube joint is formed. When a bending force is applied to the resin tube attached to one end of the joint, the tightening member 8 is tilted in the inner peripheral surface 5 of the joint main body, so that the plurality of engaging claws 10 that have evenly bite are in the unengaged state. There was a problem that the balance became a balance and the resin tube was easily pulled out.

Further, for example, in a high-temperature atmosphere around an engine during operation of an automobile, the resin tube expands and returns to the normal diameter when the temperature returns to a normal temperature when stopped. The contact claw has a problem that the adjacent portion is relatively thin, so that the contact claw is likely to remain wide due to thermal deterioration, and the resin tube is easily pulled out.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a tube joint which can make it difficult for the resin tube to come off not only when a bending force acts on the resin tube but also due to thermal deterioration. Aim to be.

[0008]

In order to achieve the above-mentioned object, a pre-assembled tube joint which can be connected by pulling back an inserted resin tube, wherein the tube joint is sequentially stepped from one end to the other end. A cylindrical body extending in the axial direction and having an inner diameter that gradually reduces in diameter, and having a shaft hole sequentially provided with a first hole, a second hole, and a third hole; and an end of the tube. It has an insertion hole that can be inserted, and is integrally provided in an inner portion of the first hole of the main body so as to protrude radially inward from an inner peripheral surface of the first hole. An annular rib; an inner peripheral surface and an outer peripheral surface, the inner peripheral surface having a guide inner peripheral surface that extends straight parallel to the axis on one end side, and is adjacent to the guide inner peripheral surface on the other end side. And a regulating concave taper inner peripheral surface that gradually increases in diameter toward the other end, and an annular ring is formed between the regulating concave taper inner peripheral surface and the annular rib. A cylindrical holder having at least the other end of the outer peripheral surface fixed in the first hole of the cylindrical main body; and an annular elastic seal member mounted in the second hole. A cylindrical base having an outer diameter slightly smaller than the inner diameter of the guide inner peripheral surface having an outer peripheral surface slidable on the guide inner peripheral surface of the holder at one axial end side; A plurality of elastically deformable arms formed with circumferentially spaced notches extending from the base toward the other end in the axial direction; A cylindrical tightening member provided integrally with a free end of the tightening member, wherein the tightening portion of the tightening member protrudes radially outward and has an inner peripheral surface of the restriction concave taper. And the outside of the inserted tube protruding inward in the centripetal direction from the head. A claw portion having a tip inner diameter smaller than that of the guide member, wherein each arm portion of the fastening member extends in the axial direction toward one end side adjacent to the fastening portion, and is equal to or larger than the inner diameter of the guide inner peripheral surface. A third portion of the tubular main body, comprising: an adjacent extension having an outer diameter of; and a thin portion extending between the adjacent extension and the base and having an outer peripheral surface smaller in diameter than the outer diameter of the base. Are formed so that the end of the tube can be fitted therein, and the tightening portion and the adjacent extension of the cylindrical tightening member are accommodated in the annular concave portion so as to be movable in the axial direction. An inner peripheral surface of the cylindrical base of the member is formed so that a distal end of the end of the tube can be inserted therein, and a distal end of the end of the tube is connected to the cylindrical fastening member;
Insert the rib and the annular elastic seal member,
When the tube is fitted into the third hole of the cylindrical body, the tube is closed.
The space between the outer peripheral surface of the end of the tube and the inner peripheral surface of the second hole is sealed by the annular elastic seal member, and when the tube is slightly retracted, the tightening member is moved together with the tube at one end. And the head of the fastening member abuts on the inner peripheral surface of the restricting concave taper, and at least a part of the arm part is weakly inserted into the inner peripheral surface of the guide. It also moves in the centripetal direction along the inner surface of the concave taper, the claw bites into the outer surface of the end of the tube, and the extension adjacent to the arm of the clamping member is in the inner surface of the guide. The tube joint is characterized by being strongly inserted into the tube joint.

[0009]

According to the present invention, as described above, the outer diameter of the cylindrical base of the cylindrical base of the tightening member is formed to have an outer diameter slightly smaller than the inner diameter of the inner circumferential surface of the guide, and at the same time, The outer diameter of the adjacent extension that extends in the axial direction adjacent to the one end side is formed to be larger than the inner diameter of the guide inner peripheral surface, and the adjacent extension is formed to be relatively thick, while the base and the adjacent extension are formed. An intermediate portion extending between them is formed in a thin portion having a diameter smaller than these outer diameters, and an empty portion is formed between the intermediate portion of the arm portion and the guide inner peripheral surface of the holder. When the one end is inserted through the one end entrance of the holder and the fastening member is inserted, the diameter of the fastening part can be easily increased and the hole can be easily inserted into the third hole. Thereafter, when the resin tube is pulled back, the fastening member is removed. Moved to one end together with the tube to form a relatively thick arm The inserted extension is securely inserted into the inner peripheral surface of the guide, and is formed by a claw that is engaged with the outer peripheral surface of the end portion of the tube and the adjacent extension that is formed relatively thick and extends in the axial direction. The inserted tube can be securely fastened. Therefore, even if a bending force acts on the resin tube, the twisting generated at the base of the head at the adjacent extension is suppressed, and the end of the resin tube is always firmly and uniformly fixed in the circumferential direction with the claw portion. To prevent the tube from coming off. In addition, the resin tube can be uniformly fixed in the circumferential direction over a long period of time even with a temperature change acting on the resin tube, and the heat deterioration performance can be improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a connection is made by pulling back a resin tube to be inserted, and the tube to be inserted is suitably used for a resin made of nylon 11, nylon 12, or the like. . On the other hand, the tubular main body and the holder are generally made of a metal material such as brass or stainless steel. However, in terms of cost and weight reduction, a heat-resistant resin, for example, a reinforced plastic such as glass-reinforced nylon reinforced with glass fiber is used. Can be adopted. The fastening member is generally made of metal, and a copper alloy is preferably used as the metal material.

The tube joint of the present invention will be specifically described with reference to the drawings. One preferred embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 10 denotes a cylindrical main body, and the main body 10 has an axial hole 11 having an inner diameter gradually decreasing in diameter from one end to the other end side and extending in the axial direction. , The second hole 11b, the third hole 1
1c and a fourth hole 11d are provided. 1st hole 11a
An annular rib 20 protruding inward in the radial direction from the inner peripheral surface of the first hole 11a is press-fitted and fixed to an inner portion of the first hole 11a, and an end portion 91 of a resin tube 90 can be inserted into the annular rib 20. An insertion hole 21 is formed.

At one end of the cylindrical main body 10, a guide inner peripheral surface 31a extending straight in parallel with the axis at one end is provided.
On the other end side, adjacent to the guide inner peripheral surface 31a, and gradually becomes larger in diameter toward the other end.
Is provided. In detail, a guide concave inner peripheral surface 31a is provided at one end side, which extends straight in parallel with the axis, and has a restrictive taper inner peripheral surface having a gradually increasing diameter toward the other end adjacent to the guide inner peripheral surface 31a at the other end side. The other end of the outer peripheral surface of the cylindrical holder 30 having the main body 31b is fitted into the first hole 11a of the main body 10, and the main body 1
It is fixed by caulking the entrance portion of 0 to the outer peripheral surface. The annular concave portion 7 is formed between the regulating concave taper inner peripheral surface 31 b and the annular rib 20.

More specifically, the annular rib 20 has a tapered outer peripheral surface 22a whose diameter gradually decreases toward one end at the center of a flange portion having an outer peripheral surface that can be fitted to the inner peripheral surface of the first hole 11a. An annular projecting portion 22 protruding in a boss shape is provided, and an insertion hole 21 through which an end portion 91 of the resin tube 90 can be inserted is provided concentrically with the cylindrical main body 10 at the center. It is fitted and fixed in contact with a radially extending annular surface adjacent to the second hole 11b inside the first hole 11a. The other end of the holder 30 is formed on a large-diameter inner peripheral surface 31 c extending straight from the large-diameter end of the concave tapered inner peripheral surface 31 b toward the other end of the holder 30. It is arranged concentrically on the outer circumference. The cylindrical fastening member 50 is held movably in the axial direction in the annular concave portion 7 and in the guide inner peripheral surface 31a.

An annular elastic sealing member such as an O-ring is mounted in the second hole 11b, and the third hole 11c is formed so that the tip of the end portion 91 of the resin tube 90 to be connected just enters. ing. The base end of a metal inner cylinder 8 into which the inner peripheral surface of the end 91 of the resin tube 90 can be inserted is fitted into the fourth hole 11d, and the holder 30 is moved toward one end. It extends to be concentric. However, when a rigid inner tube made of metal or the like corresponding to the inner tube 8 is held in advance on the inner peripheral surface of the end portion 91 of the resin tube 90, the fourth hole 11d and the inner tube 8 are unnecessary. .

As shown in FIG. 3, the cylindrical fastening member 50 has a cylindrical base 51 at one axial end and a fastening portion 52 at the other end. More specifically, a plurality of notches having the same inner diameter as the inner peripheral surface of the cylindrical base portion 51 and extending in parallel with the axis from the cylindrical base portion 51 to the other end in the axial direction at intervals in the circumferential direction. A fastening portion 52 is attached to the free end of a plurality of deformable arm portions 53 extending in the axial direction formed by applying
Are formed integrally with the base 51 and the arm 53.
The outer diameter of the outer peripheral surface of the cylindrical base 51 is the guide inner peripheral surface 31a.
The inner diameter of the tube is slightly smaller than the inner diameter of the tube, and its outer peripheral surface is slidably formed on the guide inner peripheral surface 31a of the holder 30, while the inner peripheral surface of the base is the tip of the end of the tube. Is formed so as to be insertable. In addition, the fastening portion 52
Is a head portion 52a projecting radially outward from the arm portion 53 and abutting against the regulating concave tapered inner peripheral surface 31b of the holder 30.
And a claw 52b projecting inward in the centripetal direction from the head 52a and having a tip inner diameter smaller than the outer diameter of the tube 90 to be inserted. Also, the plurality of arms 53
Is provided with an adjacent extension 53a that is adjacent to the fastening portion 52 and extends in the axial direction toward one end, and a thin portion 53c that extends between the adjacent extension 53a and the cylindrical base 51 described above. That is, the adjacent extending portion 53a has an outer diameter slightly larger than the outer diameter of the cylindrical base 51, and the thinner portion 53c has an outer peripheral surface smaller in diameter than the outer diameter of the base 51. And the cylindrical main body 1
A third hole 11c is formed so as to be able to fit the tip of the end 91 of the tube 90, and the cylindrical fastening member 50 is formed.
The tightening portion 52 and the adjacent extending portion 53a are accommodated in the annular concave portion 7 so as to be movable in the axial direction, while the tightening member 50 is
The inner peripheral surface 51a of the cylindrical base 51 is formed so that the distal end of the end 91 of the tube 90 can be inserted.

Next, a method of connecting one end 91 of the resin tube 90 to the tube joint shown in FIG. 1 will be described. As shown in FIG.
One end 91 of the tube 90 is inserted from the open end of the annular base 51 of the fastening member 30 protruding outward with respect to one end of the inner member 31, the inner peripheral surface 31 a of the fastening member 30, the insertion hole 21 of the rib 20, and The elastic seal member 4 is communicated, and the tip surface 91a is desirably inserted until it comes into contact with the innermost step 11d of the third hole. At this time, the outer peripheral surface of the tube is
In order to allow the clamp 2b to pass through, it is necessary to forcibly expand the tightening portion 52 outward in the radial direction. However, since the annular space A is generated between the guide inner peripheral surface 31a of the holder 30 and the thin portion 53b, the tightening portion 52 is formed. 52 can be easily expanded, and the distal end surface 91a of the resin tube 90 can be easily inserted to the innermost step 11d of the third hole. At this time, the outer peripheral surface of the end portion 91 of the tube 90 and the inner peripheral surface of the second hole 11b are sealed by the annular elastic seal member 4 interposed therebetween.

Thereafter, when the tube 90 is pulled back slightly, as shown in FIG.
And the head 52a of the tightening member 50 comes into contact with the regulating concave tapered inner peripheral surface 31b, and at least a part of the thick adjacent extension 53a of the arm 53 is attached to the holder 30. The other end of the guide inner peripheral surface 31a is weakly engaged, and the claw portion 52b is weakly engaged with the outer peripheral surface of the end portion 91 of the tube 90. Thereafter, when the fluid pressure acts, as shown in FIG. Further, the tube 90 is returned, the head 52a also moves in the centripetal direction along the regulating concave tapered inner peripheral surface 31b, and the claw 52b bites into the outer peripheral surface of the end portion 91 of the tube 90 and is tightened. The adjacent extension 53a of the arm 53 of the member 52 is strongly engaged and held in the guide inner peripheral surface 31a,
An appropriate bite is regulated so that the tube 90 does not bite. Preferably, as shown in the figure, the entrance of the adjacent extension 53a is chamfered with a convex tapered surface so that a part of the adjacent extension 53a can be smoothly inserted into the guide inner peripheral surface 31a of the holder 30. An insertion outer peripheral surface is formed.

Preferably, the insertion hole 21 of the rib 20 is provided.
The annular projection 22 having the above-described tapered outer peripheral surface 22a is formed on the inner peripheral edge of the resin tube 90. When the claw portion 52b pushes the resin tube 90 inward, the head portion 52a of the tightening portion 52 becomes By moving along the tapered surface 22a, the fastening portion 52 can be expanded, and the resin tube 9 can be moved.
0 can be detached from the fastening member 50, and the resin tube 90 can be easily removed from the cylindrical main body 10.

In this embodiment, as described above, the base end of the inner cylinder 8 into which the inner peripheral surface of the end 91 of the resin tube 90 can be inserted is fitted into the fourth hole 11d. Although it extends concentrically with the holder 30 toward the side, as another form, a rigid short pipe made of metal or the like corresponding to the inner cylinder 8 is previously provided on the inner peripheral surface of the end portion 91 of the resin tube 90. When held, the inner cylinder 8 is unnecessary.

As another embodiment, in the tube joint shown in FIGS. 6 and 7, the outer circumference of the extension portion 53c adjacent to the arm portion 53 of the fastening member 50 gradually decreases in diameter from the head portion 52a toward the thin portion 63b. The structure is the same as that shown in FIGS. 1 to 5 except that it is formed on a convex tapered surface 63c. By forming such a convex tapered surface 53c, the head portion 52a of the tightening portion 52 is reliably brought into contact with the concave tapered inner peripheral surface 31b in a state where the resin tube 90 is pulled back, and the adjacent portion of the arm portion 53 is extended. The portion 53c can be securely and firmly inserted into the guide inner peripheral surface 31a. Although the embodiments of the present invention have been described in detail above, these are only limited examples, and the present invention can be implemented in variously modified forms without departing from the gist thereof.

According to the present invention, the resin tube 90 can be restricted to an appropriate bite so as not to be broken, and when the resin tube 90 is pulled back, the tightening member 50 and the tube 90 are joined together. The arm portion 53 is moved to one end side, and the relatively thick adjacent extension portions 53a and 53c of the arm portion 53 are inserted into the guide inner peripheral surface 31a and bite into the outer peripheral surface of the end portion 91 of the tube. The axially extending portion 53a, 5 which is relatively thick and extends in the axial direction.
The inserted tube can be securely fastened by 3c. Therefore, even if a bending force acts on the resin tube 90, the adjacent extension portions 53 a and 53 c suppress the twisting generated at the root of the head 52 a, and the claw portion 52 b always controls the resin tube 9.
Thus, the end portion 91 can be fixed firmly and uniformly in the circumferential direction, and the tube 90 can be prevented from coming off.
And, even if the temperature of the engine room of the automobile changes and the resin tube expands or returns to its original position, and the resin tube 90 deteriorates due to a temperature change, the resin tube always keeps the resin tube circumferentially uniform. The resin tube 90 can be firmly fixed, it is difficult to come off the resin tube 90, and the resin tube 90 can be uniformly fixed in the circumferential direction for a long period of time, so that the heat deterioration performance can be enhanced. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a specific example of a tube joint of the present invention, in which a lower half is omitted.

FIG. 2 is a cross-sectional view in which a lower half is omitted for explaining a state where a resin tube is inserted into one end of the tube joint shown in FIG. 1;

3 is a cross-sectional view in which a lower half is omitted for explaining a state in which a resin tube inserted into one end of the tube joint shown in FIG. 2 is being pulled back.

FIG. 4 is a cross-sectional view in which a lower half is omitted for explaining a state in which a resin tube inserted into one end of the tube joint shown in FIG. 2 is pulled back.

FIG. 5 is a partially cutaway side view in which an upper half of a fastening member used in the tube joint shown in FIG. 1 is cut away in cross section.

FIG. 6 is a partially cutaway side view in which an upper half of another embodiment is cut away in a cross section.

7 is a cross-sectional view in which a lower half is omitted for explaining a state in which a resin tube inserted into one end of the tube joint shown in FIG. 6 is pulled back.

FIG. 8 is a partially cut-away side view of the upper half of the conventional tube joint for explaining the conventional technology, the upper half being cut off in cross section.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 10, 2000 (2000.2.1
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a sectional view of a specific example of a tube joint of the present invention, in which a lower half is omitted.

FIG. 2 is a cross-sectional view in which a lower half is omitted for explaining a state where a resin tube is inserted into one end of the tube joint shown in FIG. 1;

3 is a cross-sectional view in which a lower half is omitted for explaining a state in which a resin tube inserted into one end of the tube joint shown in FIG. 2 is being pulled back.

FIG. 4 is a cross-sectional view in which a lower half is omitted for explaining a state in which a resin tube inserted into one end of the tube joint shown in FIG. 2 is pulled back.

FIG. 5 is a partially cutaway side view in which an upper half of a fastening member used in the tube joint shown in FIG. 1 is cut away in cross section.

FIG. 6 is a partially cutaway side view in which an upper half of another embodiment is cut away in a cross section.

7 is a cross-sectional view in which a lower half is omitted for explaining a state in which a resin tube inserted into one end of the tube joint shown in FIG. 6 is pulled back.

FIG. 8 is a partially cut-away side view of the upper half of the conventional tube joint for explaining the conventional technology, the upper half being cut off in cross section.

[Description of Signs] 10 Cylindrical main body 11 Shaft hole 11a First hole 11b Second hole 11c Third hole 20 Annular rib 21 Insertion hole 30 Holder 31a Guide inner peripheral surface 31b Restricted concave taper inner periphery Surface 4 Annular elastic seal member 50 Cylindrical fastening member 51 Cylindrical base 51a Inner peripheral surface 52 Tightening portion 52a Head 52b Claw 52c Tapered surface 53 Arms 53a, 53c Adjacent extension 53b Thin portion 7 Annular recess A Void

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 8

Claims (3)

[Claims] 1. A pre-assembled tube joint which can be connected by pulling back an inserted resin tube, wherein said tube joint extends in an axial direction having an inner diameter that gradually decreases in diameter from one end to the other end. A cylindrical main body having a shaft hole having a first hole, a second hole, and a third hole, and an insertion hole through which an end of the tube can be inserted; An annular rib integrally provided in an inner portion of the first hole of the main body so as to protrude radially inward from an inner peripheral surface of the first hole; and an inner peripheral surface and an outer peripheral surface. The inner peripheral surface is provided with a guide inner peripheral surface that extends straight parallel to the axis at one end side, and the diameter of the inner peripheral surface is gradually increased toward the other end adjacent to the guide inner peripheral surface at the other end side. An annular concave portion is formed between the inner surface of the regulating taper and the annular rib, and at least the other end of the outer peripheral surface. A cylindrical holder fixed in the first hole of the cylindrical main body; an annular elastic sealing member mounted in the second hole; and an inner guide periphery of the holder at one axial end. A cylindrical base having an outer diameter slightly smaller than the inner diameter of the guide inner peripheral surface having an outer peripheral surface slidable on the surface, and a circumferential direction extending from the cylindrical base toward the other end in the axial direction. A plurality of elastically deformable arcs formed with spaced notches;
A cylindrical tightening member having an annular portion and a tightening portion disposed annularly and integrally provided at a free end of each of the arm portions; and the tightening portion of the tightening member. Has a head portion projecting radially outward and abutting on the inner peripheral surface of the regulating concave taper, and having a tip inner diameter smaller than the outer diameter of the inserted tube projecting inward from the head in the centripetal direction. A claw portion, wherein each arm portion of the fastening member extends in the axial direction toward one end side adjacent to the fastening portion, and has an outer diameter equal to or greater than the inner diameter of the guide inner peripheral surface. And a thin portion extending between the adjacent extending portion and the base portion and having an outer peripheral surface smaller in diameter than the outer diameter of the base portion, wherein a third hole of the cylindrical main body is provided in the tube. An end portion is formed so as to be fittable therein, and the fastening portion and the adjacent extension portion of the tubular fastening member are connected to the ring. An inner peripheral surface of the cylindrical base of the tightening member is formed so that a tip end of an end of the tube can be inserted therein while being housed in the recess so as to be movable in the axial direction. The end of the tube is inserted into the third hole of the cylindrical body by passing the end of the cylindrical member through the cylindrical fastening member, the rib, and the annular elastic seal member. The space between the outer peripheral surface and the inner peripheral surface of the second hole is sealed by the annular elastic seal member, and when the tube is slightly pulled back, the tightening member is moved to one end together with the tube, The head of the fastening member abuts the inner peripheral surface of the restricting concave taper, and the head moves in the centripetal direction along the inner peripheral surface of the restricting concave taper, so that the claw is formed on the outer periphery of the end of the tube. And at least a part of the extending portion adjacent to the arm portion is inserted into the guide inner peripheral surface. Bed fittings - Ju, wherein. 2. The clamping member is moved to one end together with the tube when the resin tube is slightly returned.
At least a part of the adjacent extension of the arm portion is inserted into the guide inner peripheral surface, and the head of the fastening member abuts on the regulating concave taper inner peripheral surface, and the claw portion is A tube joint wherein a biting depth of biting into an outer peripheral surface of an end portion of the tube is regulated. 3. The tube according to claim 1, wherein the outer periphery of the adjacent extension is formed as a convex tapered surface whose diameter gradually decreases from the head toward the thin portion. -Bushings.