JP2012047191A - Metal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal joint with which the detachment of a joint body from a hose can be prevented, while preventing pressure loss and securing the engagement of an inner member and an outer member.SOLUTION: The metal joint 1 is composed of an inner fitting 2 and an outer fitting 3. The inner fitting 2 includes: an enlarging diameter part 6 which can be enlarged to have an inner diameter to be inserted to a high pressure hose H equal to the inner diameter of the high pressure hose H; an extension 7 which is extended to the outside of the high pressure hose H from the end of the enlarging diameter part 6; and a plurality of outwardly facing protrusions 8 protruding from the outer periphery surface of the extension 7 toward outside in a radial direction and formed at predetermined intervals in a circumferential direction. Meanwhile, the outer fitting 3 includes: a joint body 10; a cylindrical first caulking part 14 caulked to the outer periphery surface of the high pressure hose H; and a plurality of inwardly facing protrusions 15, which is disposed closer to the end surface side of the high pressure hose H than the outwardly facing protrusion 8, and which protrudes from the inner periphery surface of the joint body 10 toward inside thereof in a radial direction and is formed at predetermined intervals in the circumferential direction.

Description

  The present invention relates to a joint fitting, and particularly to a joint fitting that is attached to an end of a high-pressure hose such as a hydraulic piping hose and connects the high-pressure hose to another member.

  As a joint fitting attached to the end of the high-pressure hose, for example, one shown in FIG. 5A is known. The joint fitting 50 includes a joint main body 55 having a passage 51 communicating with the flow path R of the high-pressure hose H, a nipple portion 56 formed in the joint main body 55 and inserted into the end of the high-pressure hose H, and the high-pressure hose. And a cylindrical caulking portion 57 that is fitted on the outer side of the H end and caulked by the high-pressure hose H. That is, the high pressure hose H is sandwiched between the nipple portion 56 and the caulking portion 57 so that the joint fitting 50 does not come off from the high pressure hose H.

  However, since the nipple portion 56 is inserted into the flow path R of the high-pressure hose H, the thickness of the nipple portion 56 protrudes into the flow path R (that is, a step is formed), and the protruding portion The pressure loss and stagnation of the fluid were caused by 56a.

  In order to solve this problem, a joint fitting that does not cause a step is proposed (for example, Patent Document 1). Explaining in detail based on FIG. 5 (b), in this fitting 60, the nipple part 62 formed integrally with the joint body 61 is inserted into the high-pressure hose H, and then the inside diameter of the nipple part 62 is the inside diameter of the high-pressure hose H. Are expanded (expanded) radially outward so as to be substantially equal. According to this, since the inner peripheral surface of the nipple portion 62 and the inner peripheral surface of the high-pressure hose H are substantially continuous surfaces without a step, it is possible to prevent pressure loss due to the nipple portion 62. The cylindrical caulking member 63 that is caulked from the outside of the high-pressure hose H is formed of a member different from the joint main body 61. After the diameters of the nipple portion 62 and the end of the high-pressure hose H are increased, It is caulked to the outer peripheral surface of the hose H.

  Further, in this joint fitting 60, an annular groove portion 64 is formed on the outer peripheral surface of the joint body 61, and the hook portion 65 is formed by bending the distal end portion 63 a of the caulking member 63 inward, thereby forming the joint body 61. And the crimping member 63 can be engaged with each other. According to this, when a force in the disengagement direction (C direction) is applied to the joint body 61, in addition to the frictional force applied between the nipple portion 62 and the high pressure hose H, the caulking member 63 and the high pressure hose H A frictional force can be generated even during the interval, and the joint body 61 can be made difficult to come off from the end of the high-pressure hose H. That is, the frictional resistance between the high-pressure hose H and the joint fitting 60 can be extremely increased even though the crimping member 63 and the nipple portion 62 are formed of separate members.

  However, according to the joint fitting 60 described above, the tip portion 63a of the crimping member 63 must be bent in the groove portion 64 when the hook portion 65 is formed, so that as shown in the enlarged view of FIG. The width L of the groove portion 64 is considerably larger than the thickness of the hook portion 65 in the caulking member 63. For this reason, when a force is applied to the joint body 61 in the direction opposite to the C direction (D direction) or when a force is applied to the caulking member 63 in the disengagement direction (C direction). There is a possibility that the length corresponding to the width L of the groove portion 64 is relatively displaced.

  Also, since the hook portion 65 is formed by bending the tip portion 63a of the crimping member 63 inward, the hook portion 65 is deformed so that it returns to its original state when a large force is applied in the C direction. There is also a possibility that the groove 64 will not be hooked. In particular, since the caulking member 63 is formed of a relatively thin material, it is difficult to increase the strength, and the ease of deformation is promoted. Furthermore, when the diameter of the nipple portion 62 is increased, a force on the outer side in the radial direction is applied to the caulking member 63 via the high-pressure hose H, so that the hook portion 65 may deviate from the groove portion 64.

  Therefore, in view of the above situation, the present invention prevents pressure loss of the fluid, ensures the engagement state between the inner member and the outer member, and prevents the joint body from coming off the hose. It is an object of the present invention to provide a fitting that can be used.

The fitting fitting of the present invention is
“An enlarged portion that is inserted into the hose so that the inner diameter is equal to the inner diameter of the hose, an extended portion that extends from the end of the enlarged portion to the outside of the hose, and the extended portion An inner metal fitting having a plurality of outward projecting portions protruding outward in the radial direction from the outer peripheral surface of the outer peripheral surface and formed at predetermined intervals in the circumferential direction;
From the inner metal fitting and a joint main body that is fitted to the outside of the hose, a cylindrical caulking portion that is formed on the joint main body and is caulked to the outer peripheral surface of the hose so as to reduce the diameter, and the plurality of outward projecting portions An outer metal fitting having a plurality of inward projections that are disposed on the end face side of the hose and project radially inward from the inner peripheral surface of the joint body and formed at predetermined intervals in the circumferential direction,
The plurality of inward protruding portions are engaged with the plurality of outward protruding portions in the insertion / removal direction of the outer metal fitting by rotation of the outer metal fitting about the inner metal fitting, and the insertion / removal is performed. It is formed so as to be switchable to a disengaged state in which the plurality of outward projections are not engaged in the direction. ''
It is characterized by this.

  Here, examples of the “hose” include a hose for hydraulic piping, but the use is not specified as long as it is a hose that allows gas or liquid to flow. It is also possible to apply to a general rubber hose.

  Further, the number and arrangement (interval) of the “outward protruding portions” are not particularly limited, but from the viewpoint of strength and stability, the number is 3 to 5 and may be arranged at equal intervals. preferable. The number of “inward projections” is preferably equal to the number of outward projections, but may be smaller than the number of outward projections.

  According to the joint fitting of the present invention, the fitting includes an inner fitting disposed inside and an outer fitting disposed outside so as to surround the inner fitting. The inner metal fitting is provided with an enlarged diameter part (also referred to as “nipple part”), and is fixed to the hose by being inserted into the hose and expanded so that the inner diameter thereof is substantially equal to the inner diameter of the hose. . In this way, when the inner diameter is expanded, the inner peripheral surface of the expanded diameter portion and the inner peripheral surface of the hose (the inner peripheral surface of the flow passage in the portion where the expanded diameter portion is not inserted) are substantially continuous without a step. It becomes a surface and it becomes possible to prevent the pressure loss by an enlarged diameter part.

  Further, the inner metal fitting is provided with an extending portion that extends from the end portion of the enlarged diameter portion to the outside of the hose, and a plurality of external protrusions projecting radially outward are provided on the outer peripheral surface of the extending portion. Directional protrusions are provided at predetermined intervals in the circumferential direction. In other words, it has a shape in which unevenness is repeated along the outer periphery like a gear.

  On the other hand, the outer metal fitting is provided with a joint body fitted on the outer side of the inner metal fitting, and a cylindrical caulking portion formed on the joint main body, and by deforming so that the diameter of the caulking portion is reduced, It is caulked to the outer peripheral surface of the hose. Thereby, it will be in the state which clamped the hose by the crimping part and the enlarged diameter part of the inner metal fitting, and a joint main part will adhere to the end of a hose.

  By the way, a plurality of inward projections protruding radially inward are provided on the inner peripheral surface of the joint body. Similar to the outward projections, the inward projections are formed at predetermined intervals in the circumferential direction. In other words, it has a shape in which unevenness is repeated along the inner periphery. In particular, the plurality of inward protruding portions are engaged with the plurality of outward projecting portions in the insertion / removal direction of the outer metal fitting by the rotation of the outer metal fitting around the inner metal fitting, and the plurality of outer protruding portions in the same direction. It is formed so as to be switchable to a non-engaged state where it does not engage with the direction protrusion. For this reason, it is possible to fit the outer metal fitting without causing the inward protruding portion to interfere with the outer protruding portion by aligning the rotation position of the outer metal fitting so as to be in the disengaged state. If the outer metal fitting is rotated so that it is in an engaged state after being inserted (if the outer metal fitting is rotated around the inner metal fitting), the inward projection is engaged with the outward projection. The inner metal fitting and the outer metal fitting are connected to each other. For this reason, when a force in the disengagement direction is applied to the outer metal fitting, a frictional force can be generated between the enlarged diameter portion and the hose and between the crimping portion and the hose, and the joint body is attached to the hose. It can be made difficult to come off from the end.

  In particular, since the outward projections formed on the inner metal fitting and the inward projections formed on the outer metal fitting are engaged, the mechanical strength for maintaining the engaged state can be increased, and the release direction Even if a large force is applied to the plate, deformation and breakage can be prevented. Further, since the outer metal fitting is switched from the non-engaged state to the engaged state by rotation of the outer metal fitting, the outer metal fitting can be engaged without providing a gap and stable support can be achieved.

In the fitting of the present invention,
“The outer metal fitting can be brought into contact with end surfaces of the extension portion and the plurality of outward projection portions of the inner metal fitting so as to sandwich the outward projection portion in cooperation with the inward projection portion. A contact portion,
The inner diameter of the contact portion is equal to the inner diameter of the inner metal fitting. ''
It is good also as a structure.

  According to the joint fitting of the present invention, the abutting portion is provided on the outer fitting, and when the outer fitting is fitted into the inner fitting, the abutting portion contacts the extended portion of the inner fitting and the end surface of the outward projection. Touch. In other words, when the outer bracket is attached, the outward projection is sandwiched between the contact portion and the inward projection, and not only the outer bracket is displaced in the direction of removal but also the inner bracket is displaced in the direction of removal. Is done. Further, since the inner diameter of the contact portion is equal to the inner diameter of the inner metal fitting, there is no step between the contact portion and the inner metal fitting, and pressure loss and retention due to the contact portion are prevented.

In the fitting of the present invention,
“The outer metal fitting further includes a second caulking portion that is caulked against the outer surface of the outward projection.”
It is good also as a structure.

  According to the joint metal fitting of the present invention, the second caulking portion is provided on the outer metal fitting, and the second caulking portion is caulked after the outer metal fitting is fitted and the inward protruding portion is engaged with the outward protruding portion. If it is done, the frictional resistance of the circumferential direction between the outward protrusion part of the inner metal fitting and the 2nd crimping part will become large, and rotation of the outer metal fitting with respect to an outward protrusion part will be prevented. Therefore, it can prevent that an outer metal fitting rotates and an engagement state is cancelled | released naturally. That is, it is possible to maintain the engagement state of the outward protrusion and the inward protrusion.

  Thus, according to the present invention, the engagement state can be maintained even when a large force is applied to the outer metal fitting having the joint body in the disengagement direction. Further, since the outer metal fitting is switched from the non-engaged state to the engaged state, the outer metal fitting can be engaged in a stable state without providing a gap in the direction in which the outer metal fitting is detached.

It is sectional drawing which shows the coupling metal fitting of this embodiment. (A) is the perspective view which decomposed | disassembled the joint metal fitting into the inner metal fitting and the outer metal fitting, and was seen from diagonally forward, (b) is a cross-sectional perspective view which shows the longitudinal cross-section. It is explanatory drawing which shows the process of adhering an inner metal fitting to a high pressure hose. It is explanatory drawing which shows the process of adhering an outer metal fitting to an inner metal fitting and a high pressure hose. It is sectional drawing which shows the conventional coupling metal fitting.

  Hereinafter, the joint metal fitting which is an embodiment of the present invention is explained. As shown in FIGS. 1 and 2, the joint fitting 1 is fixed to the end portion of the high-pressure hose H, and includes an inner fitting 2 and an outer fitting 3 provided so as to surround the inner fitting 2. Has been. Note that the high-pressure hose H is used, for example, as a hose for hydraulic piping in a hydraulically operated machine. In general, a reinforcing cord such as a wire cord is spirally wound between an inner rubber layer and an outer rubber layer. It is configured with a layer formed by turning.

  The inner metal fitting 2 is provided with a cylindrical enlarged diameter portion 6 which is inserted into the flow path R of the high pressure hose H and is expanded so that the inner diameter is equal to the inner diameter of the high pressure hose H. The expanded diameter portion 6 is formed so that the outer diameter of the expanded diameter portion 6 is slightly smaller than the inner diameter of the flow path R as shown in FIG. Thus, the enlarged diameter portion 6 can be inserted smoothly. Then, after the diameter is expanded by the diameter expansion jig unit 20 (described later), the inner diameter of the expanded diameter portion 6 becomes equal to the inner diameter of the flow path R as shown in FIGS. It is formed. FIG. 2 shows a state before the diameter is expanded.

  Further, the inner metal fitting 2 is provided with an extending portion 7 extending from the end portion of the enlarged diameter portion 6 to the outside of the high-pressure hose H. The extension part 7 is formed in a tapered shape so that the diameter gradually decreases toward the diameter-enlarged part 6, and is enlarged together with the diameter-enlarged part 6 (see FIG. 1). Note that the distal end portion (the portion on the opposite side of the enlarged diameter portion 6) of the extending portion 7 is formed so that the inner diameter is equal to the inner diameter of the high pressure hose H, and the inner diameter is large before and after the diameter expanding process. It has not changed.

  A plurality of outward projecting portions 8 projecting radially outward are provided at predetermined intervals in the circumferential direction on the outer peripheral surface of the distal end portion of the extending portion 7. It has a shape with unevenness. More specifically, in this example, four outward projections 8 are arranged at intervals of 90 degrees, and the ratio of the area occupied by each outward projection 8 in the circumferential direction is the outward projection. It is smaller than the region where 8 is not formed. Although the size of the outward projection 8 is not particularly limited, in this example, the length in the insertion / removal direction (left and right direction in FIG. 1) is about 7 mm, and the radial thickness (thickness). Is formed to be about 3 mm.

  On the other hand, as shown in FIGS. 1 and 2, the outer fitting 3 is provided with a joint body 10 that is fitted to the outside of the inner fitting 2. The joint body 10 has a passage 13 communicating with the passage 5 of the inner metal fitting 2 and the flow path R of the high-pressure hose H, and has a flange portion 11 and an annular groove portion 12 for connecting other members (not shown). It is provided on the outer peripheral surface. Further, the joint body 10 is provided with a cylindrical first caulking portion 14 that is fitted on the outer side of the high-pressure hose H and caulked on the outer peripheral surface of the high-pressure hose H. That is, the high pressure hose H can be clamped between the enlarged diameter portion 6 of the inner metal fitting 2 and the first caulking portion 14 of the outer metal fitting 3 by deforming the first caulking portion 14 so that the diameter thereof is reduced. It has become. Here, the first caulking portion 14 corresponds to the caulking portion of the present invention.

  In addition, a plurality of inward projections 15 that protrude radially inward are provided on the inner peripheral surface of the joint body 10. The inward projections 15 are formed at a predetermined interval in the circumferential direction, like the outward projections 8. More specifically, in this example, four inward projections 15 are arranged at intervals of 90 degrees, and the radial arrangement and circumferential size of each inward projection 15 are outward projections. It is formed so as to match the arrangement and size of the portion 8. Further, the inward protruding portion 15 is disposed closer to the end face side of the high pressure hose H than the outward protruding portion 8.

  Further, the joint body 10 is provided with an abutting portion 16 capable of abutting against the extending portion 7 of the inner metal fitting 2 and the end face of the outward projection 8 on the inner peripheral surface of the joint main body 10. The outward projecting portion 8 is sandwiched between the contact portion 16 and the inward projecting portion 15. Note that the inner diameter of the contact portion 16 (that is, the inner diameter of the passage 13) is equal to the inner diameter of the passage 5 in the inner metal fitting 2, and pressure loss due to the contact portion 16 does not occur.

  The joint body 10 is provided with a second crimping portion 17 at a position facing the outer peripheral surface of the outward projection 8 of the inner metal fitting 2. The second caulking portion 17 is caulked in a state where the inward protruding portion 15 is engaged with the outward protruding portion 8, and is in the circumferential direction between the second caulking portion 17 and the outward protruding portion 8. It is possible to increase the frictional resistance.

  Next, based on FIG.3 and FIG.4, the fixing method of the coupling metal fitting 1 is demonstrated. First, as shown in FIG. 3A, the diameter-enlarged portion 6 of the inner metal fitting 2 is inserted into the flow path R of the high-pressure hose H, and then, as shown in FIG. 20 is used to widen the end portions of the enlarged diameter portion 6 and the high-pressure hose H toward the radially outer side. The diameter expansion jig unit 20 is disposed along the inner peripheral surface of the diameter expansion portion 6 and has a plurality of pressing dies 21 that are divided in the circumferential direction and an expansion that urges each of the pressing dies 21 in the centrifugal direction. An opening 22 and a support 24 having an insertion hole 24a into which the expansion opening 22 is inserted are supported at the center while supporting the plurality of pressing dies 21. The pressing die 21 is horizontally formed so that the outer surface thereof is parallel to the inner surface of the enlarged diameter portion 6, but the inner surface is a tapered surface, and the inner diameter becomes closer to the support 24 side. It is formed to be smaller. On the other hand, the expansion rod 22 is inserted through the flow path R of the high-pressure hose H from the opposite side of the support 24, and has a substantially conical head portion 23 whose diameter becomes narrower toward the tip. . In addition, the inclination angle of the head 23 matches the inclination angle of the inner surface of the pressing die 21, and the expansion rod 22 is moved to the arrow E while the inner surface of the pressing die 21 is in surface contact with the outer peripheral surface of the head 23. It can be inserted in the direction. According to this, it becomes possible to urge each of the pressing dies 21 in the centrifugal direction by inserting the expanding rod 22, and to push the expanded diameter portion 6 by the pressing dies 21. Since the plurality of pressing dies 21 are separated from each other, after expanding the diameter-expanded portion 6, the plurality of pressing dies 21 can be removed from the inner surface of the diameter-expanding portion 6 by pulling out the expanding bar 22 in the opposite direction. It is possible to remove from.

  By expanding the inner diameter of the expanded diameter portion 6 using the expanded diameter jig unit 20 in this manner, the inner diameter of the expanded diameter portion 6 becomes equal to the inner diameter of the flow path R as shown in FIG. The inner peripheral surface of the enlarged diameter portion 6 and the inner peripheral surface of the high-pressure hose H are substantially continuous surfaces without a step. Therefore, the pressure loss of the fluid by the enlarged diameter part 6 comes to be prevented.

  Next, as shown in FIG. 4A, the outer metal fitting 3 is fitted into the outer side of the inner metal fitting 2. At this time, the inward protruding portion 15 formed on the outer metal fitting 3 does not face the outward protruding portion 8 of the inner metal fitting 2 (that is, the inward protruding portion 15 is not formed with the outward protruding portion 8). The outer metal fitting 3 is fitted with the rotational position of the outer metal fitting 3 so as to face the recess 9. By doing so, it is possible to fit the inward protruding portion 15 between the outward protruding portion 8 and the end face of the high-pressure hose H without contacting the outward protruding portion 8. Thereafter, the outer metal fitting 3 is rotated about 45 degrees around the inner metal fitting 2. Then, as shown in FIG. 4B, each inward projection 15 is opposed to the outward projection 8 between the outward projection 8 and the high pressure hose H, and the inward projection 15 and The outward projecting portion 8 is engaged in the direction in which the outer metal fitting 3 is detached.

  At this time, the abutting portion 16 formed on the inner peripheral surface of the joint body 10 abuts on the end surface of the extending portion 7 and the outward projecting portion 8 of the inner metal fitting 2, and the outward projecting portion 8 is The state is sandwiched between the contact portion 16 and the inward projection portion 15. For this reason, it becomes possible to prevent not only the displacement of the outer metal fitting 3 in the removal direction but also the displacement of the inner metal fitting 2 in the removal direction.

  Then, as shown in FIG.4 (c), force is applied equally to the 1st crimping part 14 of the outer metal fitting 3 over the perimeter from the outer side using the crimping apparatus 25. FIG. Then, the first caulking portion 14 is deformed so as to have a small diameter, and is caulked on the outer peripheral surface of the high-pressure hose H. Since the caulking device 25 is a well-known device that is generally used, detailed description thereof is omitted here. Moreover, since the thickness of the enlarged diameter part 6 is formed larger than the thickness of the first caulking part 14, the first caulking part 14 can be caulked without almost deforming the enlarged diameter part 6. It is.

  Finally, a force is applied from the outside to the second crimping portion 17 of the outer metal fitting 3 using the crimping device 26. According to this, the frictional resistance in the circumferential direction between the second caulking portion 17 and the outward projecting portion 8 is increased, the rotation of the outer metal fitting 3 is prevented, and the engagement state is naturally released. It becomes possible to prevent. In this case, it is not necessary to apply force evenly over the entire circumference like the first caulking portion 14, and simple caulking that can prevent the rotation of the outer metal fitting 3 may be used.

  Thus, according to the joint metal fitting 1 of this example, the outward projection 8 formed on the inner metal fitting 2 and the inward projection 15 formed on the outer metal fitting 3 are engaged. The mechanical strength can be increased, and the engaged state can be maintained even when a large force is applied to the outer metal fitting 3 in the disengagement direction. Further, since the outer metal fitting 3 is switched from the non-engaged state to the engaged state by the rotation of the outer metal fitting 3, the outer metal fitting 3 can be engaged in a stable state without providing a gap in the disengagement direction.

  Moreover, according to the joint metal fitting 1 of this example, since the outward projection part 8 of the inner metal fitting 2 is sandwiched by the contact portion 16 and the inward projection part 15, the outer metal fitting 3 and the inner metal fitting 2 Displacement can be reliably prevented.

  Furthermore, according to the joint fitting 1 of the present example, the second caulking portion 17 prevents the rotation of the outer fitting 3 with respect to the outward projection 8, so that the outward projection 8 and the inward projection 15 are engaged. Can be held, and the fitting fitting 1 can be prevented from coming off.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  That is, in the above-described embodiment, the first caulking part 14 and the second caulking part 17 are shown as the method of fixing the outer metal fitting 3, after caulking the first caulking part 14 and then caulking the second caulking part 17. May be caulked simultaneously, or the second caulking portion 17 may be caulked first.

  Moreover, in the said embodiment, what made the intensity | strength of the enlarged diameter part 6 higher than the 1st crimping part 14 by making the thickness of the enlarged diameter part 6 larger than the thickness of the 1st crimping part 14 was shown. However, the strength of the enlarged diameter portion 6 may be increased by making the material of the inner metal fitting 2 different from that of the outer metal fitting 3.

  Furthermore, in the said embodiment, although the cylindrical shape whose surface is smooth was shown as the enlarged diameter part 6 and the 1st crimping | crimped part 14, an unevenness | corrugation was formed in the surface which contact | connects the high pressure hose H, and the enlarged diameter part 6 was formed. When expanding the diameter or caulking the first caulking portion 14, a part of the enlarged diameter portion 6 or the first caulking portion 14 may be bitten into the high-pressure hose H.

DESCRIPTION OF SYMBOLS 1 Joint metal fitting 2 Inner metal fitting 3 Outer metal fitting 6 Expanded-diameter part 7 Extension part 8 Outward protrusion 10 Joint body 13 Passage 14 First caulking part (crimping part)
15 Inward protruding portion 16 Abutting portion 17 Second caulking portion H High pressure hose (hose)
R channel

JP-A-2-240493

Claims (3)

A diameter-enlarged portion that is inserted into the hose so that the inner diameter is equal to the inner diameter of the hose, an extension portion that extends from the end of the diameter-expanded portion to the outside of the hose, and An inner metal fitting having a plurality of outward projections projecting radially outward from the outer peripheral surface and formed at predetermined intervals in the circumferential direction;
From the inner metal fitting and a joint main body that is fitted to the outside of the hose, a cylindrical caulking portion that is formed on the joint main body and is caulked to the outer peripheral surface of the hose so as to reduce the diameter, and the plurality of outward projecting portions An outer metal fitting having a plurality of inward projections that are disposed on the end face side of the hose and project radially inward from the inner peripheral surface of the joint body and formed at predetermined intervals in the circumferential direction,
The plurality of inward protruding portions are engaged with the plurality of outward protruding portions in the insertion / removal direction of the outer metal fitting by rotation of the outer metal fitting about the inner metal fitting, and the insertion / removal is performed. A joint fitting formed so as to be switchable to a disengaged state in which the plurality of outward projecting portions are not engaged in a direction. The outer metal fitting is in contact with the extending portion of the inner metal fitting and the end faces of the plurality of outward protruding portions so as to sandwich the outward protruding portion in cooperation with the inward protruding portion. Further comprising
The joint fitting according to claim 1, wherein an inner diameter of the contact portion is equal to an inner diameter of the inner fitting.   The joint bracket according to claim 1, wherein the outer metal fitting further includes a second caulking portion that is caulked against an outer surface of the outward projecting portion.

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