WO2016002809A1

WO2016002809A1 - Hose with joint

Info

Publication number: WO2016002809A1
Application number: PCT/JP2015/068894
Authority: WO
Inventors: 隆数櫛笥; 伸一郎中市; 雅彦近藤
Original assignee: 株式会社ブリヂストン
Priority date: 2014-06-30
Filing date: 2015-06-30
Publication date: 2016-01-07
Also published as: JPWO2016002809A1; CN106662278B; CN106662278A

Abstract

　A hose (12) is held between an insertion part (26) of a nipple (18), and a second crimped part (56) and third crimped part (58) of a sleeve (20). A first fixed-diameter part (38), a second fixed-diameter part (42), a first annular groove (44), a third fixed-diameter part (46), a second annular groove (48), a fourth fixed-diameter part (50), and a third annular groove (52) are formed in the insertion part (26). The surface pressure exerted on the nipple (18) is 100 MPa or less.

Description

Hose with fitting

The present invention relates to a hose with a joint in which the hose is connected to a joint, and more particularly to a hose with a joint in which a nipple of the joint is formed of a resin.

As a hose with a joint in which a hose into which a nipple is inserted is crimped with a sleeve, for example, there is a hose with a joint as disclosed in JP 2013-139839 A.

In this type of joint, the nipple and the sleeve are generally made of metal.
However, if the material of the nipple is changed from metal to resin and the sleeve is crimped with the same load as that of metal, the nipple may be damaged by the surface pressure acting on the nipple. There was room for improvement.

An embodiment of the present invention aims to ensure the durability of a nipple in a hose with a joint in which a joint having a resin nipple is connected to the hose.

A hose with a joint according to a first aspect includes a hose, a resin nipple provided with an insertion portion inserted into the hose on one end side, and a connection portion connected to a connection target on the other end side, A sleeve provided on the outer peripheral side of the insertion portion and sandwiching the hose with the insertion portion; a plurality of annular portions provided on the outer peripheral portion of the insertion portion, having different diameters; and the nipple formed on the sleeve A surface pressure acting on the insertion portion received from the hose is a maximum value at a position facing the crimping portion, and the maximum surface pressure acting on the insertion portion is The value is set to 100 MPa or less.

In the hose with a joint according to the first aspect, the insertion portion of the nipple is inserted into the hose, and the hose is disposed between the insertion portion and the sleeve. The hose disposed between the nipple and the sleeve is clamped while being pressed against the annular portion of the insertion portion by the crimping portion of the sleeve, and water tightness between the hose and the nipple is ensured.

Since the hose is sandwiched between the annular portion and the caulking portion, the hose is pressed by the caulking portion, and surface pressure acts on the nipple. The surface pressure acting on the insertion part of the nipple is maximum at the position facing the caulking part, but the surface pressure acting on the insertion part of the nipple is suppressed to 100 MPa or less. It is possible to ensure durability.

The hose with a joint according to the aspect of claim 2 is the hose with a joint according to the first aspect, wherein the maximum value of the surface pressure is the shortest distance between the convex curved portion and the annular portion. Point to.

The durability of the nipple formed of resin can be reliably ensured by setting the location of the maximum surface pressure at the location where the distance between the convex curved portion and the annular portion is the shortest.

A hose with a joint according to a third aspect is the hose with a joint according to the first aspect or the second aspect, wherein the caulking portion protrudes convexly toward the annular portion and is a cross section along the axial direction. The shape when it sees in (1) is provided with the convex curve-shaped part formed in the convex curve shape toward the said annular part.

The surface pressure increases between the minimum inner diameter portion of the crimped portion and the annular portion, but in the hose with a joint according to the third aspect, the minimum inner diameter portion of the crimped portion is formed in a convex curved shape, The constituent material of the hose interposed between the minimum inner diameter portion and the annular portion of the caulking portion easily moves to both sides in the axial direction. Therefore, when the caulking portion is processed, the hose constituent material interposed between the annular portion and the minimum inner diameter portion of the caulking portion moves appropriately on both sides in the axial direction, so that the local surface pressure acting on the nipple is locally increased. Rise is suppressed.

A hose with a joint according to a fourth aspect is the hose with a joint according to any one of the first to third aspects, wherein the nipple is polyphenylene sulfide, polybutylene terephthalate, polyacetal, polyether It is formed of any of ether ketones.

The durability of the nipple can be improved by forming the nipple with any of polyphenylene sulfide, polybutylene terephthalate, polyacetal, and polyether ether ketone.

The hose with joint according to the fifth aspect is the hose with joint according to any one of the first to fourth aspects, wherein the hose is provided with an inner layer made of polyolefin resin.

In the hose with a joint according to the fifth aspect, since the polyolefin resin constituting the inner layer has flexibility, the polyolefin resin can be appropriately moved to both sides in the axial direction when the crimped portion is processed. As a result, an increase in the surface pressure acting on the insertion portion of the nipple is suppressed.

The joint-attached hose according to the sixth aspect is the joint-attached hose according to any one of the first to fifth aspects. An inner surface of the sleeve is provided with a first inclined portion on the side opposite to the distal end side of the hose, a second inclined portion is provided on the distal end side of the hose, and an inclination angle of the second inclined portion with respect to the axial direction Is set larger than the inclination angle of the first inclined portion.

The caulking portion in the hose with a joint according to the sixth aspect is provided with a second inclined portion having a large inclination angle on the tip side of the hose, and therefore when a force in the direction of pulling out the hose is applied. The hose is easily caught on the crimped portion, and the hose is difficult to come off. In addition, since it becomes difficult to remove the hose, it is possible to reduce the surface pressure, thereby improving the durability of the nipple.

The joint-attached hose according to a seventh aspect is the joint-attached hose according to any one of the first to sixth aspects, wherein the crimping portion includes an end portion of the hose of the sleeve. It is formed on the side opposite to the side where it is disposed.

In the hose with a joint according to the seventh aspect, the caulking portion is formed on the side of the sleeve opposite to the side where the end of the hose is disposed, that is, the hose is between the sleeve and the nipple. The part strongly clamped by is formed at a position away from the end of the hose. For this reason, even if a large tension acts on the hose and moves relatively in the direction in which the hose is pulled out from the joint, the moving distance until the hose drops off, that is, the shaft from the end of the hose to the crimping portion. Since the directional dimension is long, it is possible to make it difficult to pull out the hose as compared with the case where the crimped portion is disposed on the end side of the hose.

A hose with a joint according to an eighth aspect is the hose with a joint according to any one of the first to seventh aspects, comprising a plurality of the caulking parts, the caulking part, the annular part, The caulking width of the caulking portion where the distance is the shortest is narrower than the caulking width of the other caulking portions.

In the hose with a joint according to the eighth aspect, the width of the caulking portion that is the shortest distance between the caulking portion and the annular portion is the narrowest among the plurality of caulking portions. The hose can be securely held by the crimped portion and the nipple, and the durability of the resin nipple can be ensured.
When the sleeve is crimped, the hose sandwiched between the sleeve and the nipple is compressed, so that the hose material forming the hose moves to both sides of the crimping portion. However, if the caulking width is widened at a location where the surface pressure is high, the hose material between the wide caulking portion of the sleeve and the nipple is difficult to move to both sides of the caulking portion, and the width of the portion where the surface pressure increases becomes large. It becomes wide and the nipple is easily broken.
On the other hand, if the caulking width is narrowed, the hose material between the wide caulking portion of the sleeve and the nipple is likely to move to both sides of the caulking portion, and the width of the portion where the surface pressure increases is not widened. Damage is suppressed.

The manufacturing method of the hose with a joint which concerns on a 9th aspect is equipped with the insertion part inserted in the hose and the said hose in one end side, and the resin-made nipple provided with the connection part connected to a connection object in the other end side A sleeve that is provided on the outer peripheral side of the insertion portion and sandwiches the hose between the insertion portion, a plurality of annular portions that are provided on the outer peripheral portion of the insertion portion and have different diameters, and formed in the sleeve A hose with a joint provided with a plurality of crimped portions, wherein the sleeve is configured to be the narrowest crimped portion at the shortest distance between the crimped portion and the annular portion. Perform caulking.

In the method for manufacturing a hose with a joint according to the ninth aspect, the sleeve is swaged so that the narrowest swaged portion is formed at the shortest distance between the swaged portion and the annular portion among the plurality of swaged portions. As a result, a hose with a joint that can ensure the durability of the resin nipple while securely holding the hose with the nipple and the sleeve is obtained.

When the sleeve is crimped, the hose sandwiched between the sleeve and the nipple is compressed, so that the hose material forming the hose moves to both sides of the crimping portion. However, if the caulking width is widened at a location where the surface pressure is high, the hose material between the wide caulking portion of the sleeve and the nipple is difficult to move to both sides of the caulking portion, and the width of the portion where the surface pressure increases becomes large. It becomes wide and the nipple is easily broken.
On the other hand, if the caulking width is narrowed, the hose material between the wide caulking portion of the sleeve and the nipple easily moves to both sides of the caulking portion, and the width of the portion where the surface pressure increases is not widened. Damage is suppressed.

The method for manufacturing a hose with a joint according to the tenth aspect is the method for manufacturing a hose with a joint according to the ninth aspect, in which the caulking portion in one place is caulked in a plurality of times.

In the method of manufacturing a hose according to the tenth aspect, the surface pressure is increased stepwise with respect to the nipple by performing the crimping in a plurality of times at the one crimping portion, so Since the surface pressure is not rapidly increased by tightening, damage to the nipple due to a rapid increase in the surface pressure can be suppressed.

As described above, according to the hose with a joint according to the first aspect, the durability of the resin nipple can be ensured, and even if the surface pressure is low, water leakage or the like can be ensured, and the performance can be ensured. It has an excellent effect.

According to the method for manufacturing a hose with a joint according to the ninth aspect, the hose with a joint that can ensure the durability of a resin nipple and can ensure performance without causing water leakage even at a low surface pressure. Can be obtained.

It is sectional drawing along the axis line which shows the hose with a joint which concerns on 1st Embodiment by which the hose was connected to the joint. It is sectional drawing along the axis which shows the hose with a joint which concerns on 2nd Embodiment. It is sectional drawing along the axis which shows the hose with a joint which concerns on 3rd Embodiment. It is sectional drawing along the axis which shows the hose with a joint which concerns on 4th Embodiment. It is sectional drawing along the axis which shows the hose with a joint which concerns on 5th Embodiment. It is sectional drawing along the axis which shows the hose with a joint which concerns on 6th Embodiment. It is an expanded sectional view along the axis which shows the 2nd crimping part. It is an expanded sectional view along the axis which shows the 3rd crimping part.

1, a hose 8 with a joint according to an embodiment of the present invention will be described. The hose 8 with a joint is for water supply to water equipment such as a washing toilet unit, a kitchen faucet, and a dishwasher (water supply hot water supply). The joint 10 for connecting to 14 is provided. In FIG. 1, the arrow A direction means one of the axial directions of the joint 10, and the arrow B direction means the other of the axial directions.

The hose 12 is, for example, a resinous hose reinforced with a mesh 16 or a composite hose of resin and rubber having a resin layer on the inner surface. As the resin used for the hose 12, for example, crosslinked polyethylene, polyethylene, polybutene, vinyl chloride, and the like can be used, but other resins can also be used. The hose 12 may be a known one made of an elastic material.

(Overall structure of fitting)
The joint 10 includes a nipple 18, a sleeve 20, an O-ring 22, a cap nut 24, and a seal ring 60.

(Cap nut)
The cap nut 24 is a fastening means to the external thread 14A of the water supply pipe 14 to be connected. The cap nut 24 has an opening 24A on the arrow A direction side. The cap nut 24 is formed with a female screw 24B from the opening 24A to a predetermined depth in the arrow B direction. A small-diameter portion 24C having a smaller diameter than the inner diameter of the female screw 24B is formed at the end of the cap nut 24 opposite to the opening 24A (arrow B direction side).

(nipple)
The nipple 18 of this embodiment is formed of resin. As the resin, polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyacetal (POM), polyether ether ketone (PEEK) and the like can be used, but other resins can also be used. Moreover, well-known reinforcing materials, such as glass fiber, may be mixed in resin.

The nipple 18 is a member that is inserted into the cap nut 24 and connected to the cap nut 24, and is formed in a cylindrical shape as a whole. The nipple 18 is formed with an insertion portion 26 to be inserted into the hose 12 on the arrow B direction side. On the arrow A direction side of the insertion portion 26, the first large diameter portion 28, the sleeve locking annular groove portion 30, Two large diameter portions 32 and a flange portion 34 are sequentially formed.

The outer diameter of the insertion portion 26 is formed to be slightly larger than the inner diameter of the hose 12. The outer diameter of the first large diameter portion 28 is larger than the outer diameter of the insertion portion 26 and the cap nut 24. The small diameter portion 24C is formed to have a smaller diameter.

The outer diameter of the second large-diameter portion 32 is larger than the outer diameter of the first large-diameter portion 28 and smaller than the small-diameter portion 24C of the cap nut 24.

Further, the outer diameter of the flange portion 34 is formed to be larger than the outer diameter of the second large-diameter portion 32, is larger than the small-diameter portion 24C of the cap nut 24, and the female screw 24B of the cap nut 24 is provided. The inner diameter is smaller than the inner diameter.

The insertion portion 26 includes a tapered portion 36 whose diameter gradually decreases toward the tip in the arrow B direction, and the first constant diameter portion 38 and the O-ring 22 are fitted on the arrow A direction side of the tapered portion 36. An O-ring groove 40, a second constant diameter portion 42, a first annular groove portion 44, a third constant diameter portion 46, a second annular groove portion 48, a fourth constant diameter portion 50, and a third annular groove portion 52 are provided. It is formed in order.

The first constant diameter part 38, the second constant diameter part 42, the third constant diameter part 46, and the fourth constant diameter part 50 extend with the same outer diameter in the axial direction. The second constant diameter portion 42 is set to have the longest axial length among these four constant diameter portions. The third constant diameter portion 46 and the fourth constant diameter portion 50 have the same length in the axial direction, and are formed to have the shortest axial length among the four constant diameter portions.

The first annular groove 44, the second annular groove 48, and the third annular groove 52 are formed to have the same outer diameter, and the first annular groove 44 and the third annular groove 52 are compared in groove width. The groove width of the second annular groove portion 48 is formed wider than the first annular groove portion 44 and the third annular groove portion 52.
The first constant diameter portion 38, the second constant diameter portion 42, the first annular groove portion 44, the third constant diameter portion 46, the second annular groove portion 48, the fourth constant diameter portion 50, the third Annular groove 52, first annular groove 55A, second annular groove 55B, third annular groove 55C, fourth annular groove 55D, first constant diameter part 57A, second constant diameter part 57B, 3 constant-diameter portions 57C are the annular portions of this embodiment.

(sleeve)
The sleeve 20 is made of stainless steel, a steel material, a plated steel material, a non-ferrous metal material such as aluminum or copper, and the diameter of the sleeve 20 is reduced by caulking. In the sleeve 20 of the present embodiment, a first crimping portion 54 is formed at the end on the arrow A direction side, and the second crimping portion 54 is spaced apart on the arrow B direction side of the first crimping portion 54. A third caulking portion 58 is formed at an interval on the arrow B direction side of the tightening portion 56 and the second caulking portion 56. The end of the first caulking portion 54 is inserted into the sleeve locking annular groove 30 of the nipple 18, whereby the sleeve 20 is fixed to the nipple 18.

The second caulking portion 56 is formed at a position facing the second annular groove portion 48 of the nipple 18. On the inner surface of the second caulking portion 56, an inner surface constant diameter portion 56 </ b> A extending at a constant diameter in the axial direction is formed at the minimum inner diameter portion. Further, on the inner surface of the second caulking portion 56, the first arcuate inclined portion on the opposite side (arrow B direction side) to the tip side of the hose 12 inserted into the sleeve 20 relative to the constant inner diameter portion 56 </ b> A. 56B is formed, and a second arc-shaped inclined portion 56C is formed on the opposite side (arrow A direction side) from the first arc-shaped inclined portion 56B.

The inclination angle θ1 of the first arc-shaped inclined portion 56B with respect to the axial direction of the sleeve 20 and the inclination angle θ2 of the second arc-shaped inclined portion 56C with respect to the axial direction of the sleeve 20 are set to the same angle. For this reason, as for the 2nd crimping part 56, the arrow A direction side and the arrow B direction side become symmetrical shape on both sides of 56 A of inner surface constant diameter parts. Note that the inclination angle θ1 of the first arc-shaped inclined portion 56B is an angle formed by a tangent line at the end portion on the constant inner diameter portion 56A side of the first arc-shaped inclined portion 56B and the axis of the sleeve 20. In addition, the inclination angle θ2 of the second arc-shaped inclined portion 56C is an angle formed by the tangent line at the end portion on the inner surface constant diameter portion 56A side of the second arc-shaped inclined portion 56C and the axis of the sleeve 20.

The third caulking portion 58 is formed at a position facing the second constant diameter portion 42 of the nipple 18 (that is, radially outward of the second constant diameter portion 42). On the inner surface of the third caulking portion 58, a convex curved surface portion 58 </ b> A that forms a convex curved surface toward the inner side in the radial direction, that is, toward the second constant diameter portion 42, is formed at the minimum inner diameter portion. Further, on the inner surface of the third caulking portion 58, the first arcuate inclined portion on the opposite side (arrow B direction side) of the hose 12 inserted into the sleeve 20 from the convex curved portion 58A. 58B is provided, and a second arc-shaped inclined portion 58C is provided on the opposite side (arrow A direction side) from the first arc-shaped inclined portion 58B.

The inclination angle θ4 of the second arc-shaped inclined portion 58C with respect to the axial direction of the sleeve 20 is the inclination angle θ1 of the first arc-shaped inclined portion 56B of the second caulking portion 56 and the second arc-shaped inclined portion 56C. The inclination angle is the same as the inclination angle θ2. On the other hand, the inclination angle θ3 of the first arcuate inclined portion 58B of the third caulking portion 58 with respect to the axial direction of the sleeve 20 is set to be smaller than the inclination angle θ4 of the second arcuate inclined portion 58C. For this reason, when viewed in a cross section along the axial direction, the inner shape of the third caulking portion 58 is asymmetrical between the arrow A direction side and the arrow B direction side.

The hose 12 interposed between the sleeve 20 and the insertion portion 26 of the nipple 18 is partially reduced in diameter by the second caulking portion 56 and the third caulking portion 58 that bite into the outer peripheral surface. The inner peripheral surface bites into the first annular groove portion 44, the second annular groove portion 48, and the third annular groove portion 52 of the insertion portion 26, and the inner peripheral surface closely contacts the O-ring 22 of the insertion portion 26. is doing. Accordingly, the hose 12 and the insertion portion 26 are sealed, and the hose 12 is sandwiched and fixed between the sleeve 20 and the insertion portion 26 of the nipple 18.
The inner diameter of the second crimping portion 56 and the inner diameter of the third crimping portion 58 are the same.

In the hose 8 with a joint, an annular seal ring 60 is disposed between the end face of the water supply pipe 14 and the end face of the flange portion 34, and the cap nut 24 is fastened to the water supply pipe 14, thereby It is fixed.

(Assembly procedure)
Next, an example of the assembly procedure of the hose 8 with a joint according to this embodiment will be described.
(1) The O-ring 22 is fitted into the O-ring groove 40 of the nipple 18.
(2) The insertion portion 26 of the nipple 18 is inserted into the sleeve 20, the first crimping portion 54 is formed at the end of the sleeve 20, and the end of the first crimping portion 54 is engaged with the sleeve of the nipple 18. Insert into the annular groove 30. As a result, the sleeve 20 and the nipple 18 are integrated.
(3) The nipple 18 is inserted from the opening side of the cap nut 24 and the nipple 18 and the cap nut 24 are connected.
(4) Insert the end portion of the hose 12 between the insertion portion 26 of the nipple 18 and the sleeve 20.

(5) Two portions of the sleeve 20 are crimped to form the second crimping portion 56 and the third crimping portion 58. As a result, the second crimping portion 56 and the third crimping portion 58 bite into the outer surface of the hose 12, and the inner peripheral surface of the hose 12 becomes the outer peripheral surface of the insertion portion 26 and the outer peripheral portion of the O-ring 22. In close contact. Here, the load when forming the second caulking portion 56 and the third caulking portion 58 is set so that the maximum surface pressure acting on the insertion portion 26 of the nipple 18 is 100 MPa or less. .
The position where the surface pressure is maximum in the insertion portion 26 of the present embodiment is the position where the radial distance between the sleeve 20 and the insertion portion 26 is the shortest, that is, the minimum inner diameter portion of the third crimping portion 58. This is a position P where the convex curved surface portion 58A faces (a position where the insertion surface 26 intersects with a virtual surface perpendicular to the axial direction passing through the convex curved surface portion 58A), and the surface pressure at this position P is 100 MPa or less. The caulking process is performed so that
In the above assembly procedure example, the steps from (1) to (5) were performed in order to assemble the hose 8 with a joint. However, the present invention is not limited to this, and (1), (3), ( The hose 8 with a joint can also be assembled in the order of 4), (2), and (5).

In the present embodiment, among the second caulking portion 56 and the third caulking portion 58 that sandwich the hose 12, the sleeve 20 is located at the position facing the third caulking portion 58 having the narrowest caulking width. The sleeve 20 is caulked so that the radial distance between the insertion portion 26 and the insertion portion 26 is shortened.
The caulking width is a dimension measured as follows.
7A, the caulking width W ₅₆ of the second caulking portion 56 is equal to the extension line 20La of the sleeve inner surface on one side in the axial direction of the second caulking portion 56 and the second caulking width W ₅₆ . A point of intersection with an imaginary line FL1 parallel to the axis passing through the innermost end of the crimping portion 56 is A, and an intersection of the extension line 20Lb of the inner surface of the sleeve on the other axial side of the second crimping portion 56 and the imaginary line FL1. Is the distance between the intersection A and the intersection B measured along the axial direction.

7B, the caulking width W ₅₈ of the third caulking portion 58 is equal to the extension line 20Lc of the sleeve inner surface on one side in the axial direction of the third caulking portion 58. The intersection of the imaginary line FL2 parallel to the axis passing through the innermost end of the third crimping portion 58 is C, the extension line 20Ld of the sleeve inner surface on the other axial side of the third crimping portion 58 and the imaginary line FL2 The distance between the intersection C and the intersection D measured along the axial direction is defined as D.
As shown in FIGS. 7A and 7B, in this embodiment, the caulking width W _{58 of} the third caulking portion 58 is narrower than the caulking width W _{56 of} the second caulking portion 56. .

The surface pressure acting on the insertion portion 26 is, for example, a pressure measuring film that is colored by receiving pressure is disposed between the hose 12 and the insertion portion 26, and after crimping, the joint 10 is disassembled. Then, the pressure measuring film is taken out, and the color density can be measured. In addition, non-destructive inspection, for example, X-ray CT accurately measures the dimensions of each part, takes into account the strength of the material of each member, and the deformation amount (diameter change amount) of the nipple 18 at a position facing the caulking part. ) To measure the surface pressure indirectly.

After the sleeve 20 is caulked and the hose 12 is fixed, the seal ring 60 is disposed in the cap nut 24, thereby completing the hose 8 with a joint.
The joint-attached hose 8 can be connected to the water supply pipe 14 by fastening the cap nut 24 to the male screw 14A of the water supply pipe 14 as an example of the connection target.

(Function, effect)
In the hose 8 with a joint according to the present embodiment, the second caulking portion 56 and the third caulking portion 58 are formed on the sleeve 20, so that the diameter of the hose 12 is reduced at the caulking portion. The inner peripheral surface is the entire outer peripheral surface excluding a part of the tapered portion 36 of the insertion portion 26 of the nipple 18 (first constant diameter portion 38, second constant diameter portion 42, first annular groove portion 44, third constant groove portion). The diameter portion 46, the second annular groove portion 48, the fourth constant diameter portion 50, and the third annular groove portion 52) and the outer peripheral portion of the O-ring 22. In the meantime, high airtightness and watertightness are obtained.

By forming the second crimping portion 56 and the third crimping portion 58 on the sleeve 20, the second crimping portion 56 and the third crimping portion 58 bite on the outer peripheral surface of the hose 12. The inner peripheral surface of the hose 12 enters the first annular groove portion 44, the second annular groove portion 48, and the third annular groove portion 52, and further, the third caulking portion 58 and the second constant diameter portion 42. Since the surface pressure acting on the hose 12 is the highest, the disconnection of the hose 12 is effectively suppressed.

When the hose 12 is sandwiched between the second constant diameter portion 42 and the third crimping portion 58, the hose 12 between the second constant diameter portion 42 and the third crimping portion 58 Surface pressure acts. The surface pressure increases between the second constant diameter portion 42 and the third crimping portion 58, but in this embodiment, the minimum inner diameter portion of the third crimping portion 58 is formed in a convex curve shape. Since the convex curved portion 58A is formed, the second constant diameter portion 42 and the minimum constant inner diameter portion 42A are compared with a case where the minimum inner diameter portion is clamped by a crimping portion having a constant inner diameter portion extending in the axial direction. The constituent material of the hose 12 interposed between the third caulking portion 58 easily moves to both axial sides of the third caulking portion 58.

For this reason, when the third caulking portion 58 is processed, the constituent material of the hose 12 interposed between the second constant diameter portion 42 and the minimum diameter portion of the third caulking portion 58 is on both axial sides. Accordingly, the local increase in the surface pressure received by the nipple 18 is suppressed.
Since the first annular groove 44 is provided adjacent to the second constant diameter portion 42 in the direction of arrow A, the constituent material of the hose 12 can easily escape to the first annular groove 44 side. ing. In the present embodiment, the first annular groove portion 44 is formed on the arrow A direction side of the second constant diameter portion 42, but the first constant groove portion 42 is formed on the arrow B direction side of the second constant diameter portion 42. An annular groove similar to the annular groove portion 44 (however, the arrow A direction side of the O-ring groove 40) can also be formed. By forming the annular groove on the arrow B direction side of the second constant diameter portion 42, the constituent material of the hose 12 can easily escape to both sides of the third crimping portion 58.

And in the hose 8 with a joint of this embodiment, the surface pressure which acts on the hose 12 arrange | positioned between the sleeve 20 and the insertion part 26 is the 2nd fixed diameter part 42 and the 3rd crimping part 58. Although the maximum value is obtained with respect to the convex curved portion 58A, the surface pressure received by the nipple 18 is suppressed to 100 MPa or less, so that the durability of the nipple 18 formed of resin is ensured.

In the hose 8 with a joint according to the present embodiment, the nipple 18 is made of any resin selected from polyphenylene sulfide, polybutylene terephthalate, polyacetal, and polyether ether ketone, so that the nipple 18 has high durability. Can be obtained. Further, higher durability can be obtained by including glass fibers in these resins.

Further, on the inner surface of the third caulking portion 58 of the sleeve 20, a first arcuate inclined portion disposed on the distal end side of the hose 12 inserted into the sleeve 20 on the side opposite to the distal end side of the hose 12. A second arcuate inclined portion 58C having a larger inclination angle than 58B is provided. For this reason, when the hose 12 receives tension in the direction in which the hose 12 is pulled out from the sleeve 20 (arrow B direction), the inner peripheral surface of the third crimping portion 58 is easily caught on the outer peripheral surface of the hose 12. It is difficult to remove. Note that the inclination angle θ4 of the second arcuate inclined portion 58C is preferably set within the range of 30 to 80 °.

The third caulking portion 58 that generates the highest surface pressure with respect to the nipple 18 is formed on the side of the sleeve 20 opposite to the side where the end of the hose 12 is disposed, that is, the hose. A portion where 12 is most strongly clamped between the sleeve 20 and the nipple 18 is formed at a position away from the end of the hose 12.
For this reason, even when a large tension acts on the hose 12 and moves relative to the direction in which the hose 12 is pulled out from the joint 10 (arrow B direction), the moving distance (the end of the hose 12) until the hose 12 drops off. The axial dimension from the portion to the third caulking portion 58 is long, so that the hose 12 is difficult to come off from the joint 10.

Polyolefin resins such as polybutene and cross-linked polyethylene have water resistance and moderate flexibility, and are suitable as resins used for the inner layer of the hose 12. For this reason, when the hose 12 provided with the inner layer made of polyolefin resin on the inner periphery is used, the polyolefin resin is removed in the axial direction of the third crimping portion 58 by the pressure when the third crimping portion 58 is formed. It can be moved moderately to both sides, and a local increase in surface pressure can be reliably suppressed.

Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. .

[Second Embodiment]
The number of caulking portions formed on the sleeve 20 is not limited to the number of the above embodiments, and the number of constant diameter portions and annular groove portions formed on the nipple 18 is not limited to the number of the above embodiments. As an example, the hose 8 with a joint according to the second embodiment shown in FIG. 2 has a third constant section having a rectangular cross section between the first large diameter section 28 and the second constant diameter section 42. A diameter portion 46, a fourth constant diameter portion 50, a fifth constant diameter portion 62, and a sixth constant diameter portion 64 are formed.

In the above embodiment, the cross-sectional shape of the convex curved surface portion 58A provided in the minimum inner diameter portion of the third crimped portion 58 is a convex curved surface when viewed in a cross section along the axial direction. In the embodiment of the present invention, even if a linear part having a length of 0.7 mm or less parallel to the axial direction is included, the convex curved part 58A is regarded as a convex curved part. Even if the third caulking portion 58 includes a linear portion parallel to the axial direction, if the length of the linear portion is 0.7 mm or less, the configuration of the hose 12 when caulking is performed. Since the material can move moderately to both sides in the axial direction, it is possible to suppress a local increase in surface pressure.

[Third Embodiment]
In the embodiment shown in FIGS. 1 and 2, the hose 12 is sandwiched between the third crimping portion 58 and the second constant diameter portion 42 having a long axial length. It may be clamped between the caulking portion 58 and the annular groove portion.

In FIG. 3, the insertion portion 26 includes a first annular groove portion 55A, a first constant diameter portion 57A, a second annular groove portion 55B, a second constant diameter portion 57B, a third annular groove portion 55C, and a third constant groove portion. The diameter portion 57C and the fourth annular groove portion 55D are formed in this order, and the hose 12 is provided between the second crimping portion 56 and the third annular groove portion 55C, and between the third crimping portion 58 and the second annular groove portion. 3rd Embodiment pinched by caulking between the groove parts 55B is shown. Also in the third embodiment, the local increase in the surface pressure is suppressed, and the surface pressure acting on the nipple 18 is 100 MPa or less.

[Fourth Embodiment]
FIG. 4 shows a fourth embodiment which is a modification of the embodiment of FIG. In the fourth embodiment shown in FIG. 4, the amount of crimping of the sleeve 20 is set smaller than that in the third embodiment shown in FIG. Also in the fourth embodiment, the local increase in the surface pressure is suppressed, and the surface pressure acting on the nipple 18 is 100 MPa or less.

[Fifth Embodiment]
FIG. 5 shows a fifth embodiment which is a modification of the third embodiment shown in FIG. In the fifth embodiment of FIG. 5, the second constant diameter portion 57B is formed to have a larger diameter than the first constant diameter portion 57A and the third constant diameter portion 57C. Also in the fifth embodiment, the local increase in the surface pressure is suppressed, and the surface pressure acting on the nipple 18 is 100 MPa or less.

[Sixth Embodiment]
FIG. 6 shows a sixth embodiment, which is a modification of the first embodiment shown in FIG.
In the sixth embodiment shown in FIG. 6, the sleeve 20 is not formed with the third crimping portion 58, and the inner surface constant diameter portion 56A of the second crimping portion 56 is formed longer than the first embodiment. Has been. In the sixth embodiment, the inner constant diameter portion 56 </ b> A is opposed to the fourth constant diameter portion 50 from the first constant diameter portion 38 of the nipple 18. Also in the sixth embodiment, the local increase in the surface pressure is suppressed, and the surface pressure acting on the nipple 18 is 100 MPa or less.

(Test example)
In order to confirm the effect of the embodiment of the present invention, a plurality of joints each provided with a metal nipple and a joint provided with a resin nipple are prepared, and a hose is connected to these joints to connect the hose to the sleeve. A hose with a joint with different values was manufactured, and the crimping rate, surface pressure, nipple state, and tensile strength of the hose were examined for each hose with a joint. In addition, the shape of the joint used for the test is the same shape as the joint of the embodiment shown in FIG.
In addition, what was set as the structure of following Table 1 was used for the hose. The nipple and sleeve materials and the dimensions of the nipple insertion part are shown in Table 1 below.

Table 2 below shows the crimping rate of the jointed hose, the surface pressure acting on the nipple, the nipple state, the tensile strength of the hose, and the nipple state after the deterioration treatment.
The caulking rate is calculated as follows.
・ Caulking rate = (Outer diameter of crimped portion− (Outer diameter of hose × 2 + Outer diameter of inserted portion of nipple + Thickness of sleeve × 2)) / Thickness of hose × 2
The caulking rate shown in Table 1 is the caulking rate of the third caulking portion.
The surface pressure is the surface pressure of the part of the nipple facing the third crimping part. After the pressure measurement film is placed between the hose and the insertion part and crimping is performed, the joint is disassembled. The film for pressure measurement was taken out, and the color density was obtained by visual observation.
The caulking rate is calculated on the assumption that the thicknesses of the nipple and the sleeve are not changed by caulking.

Regarding the nipple state, the joint was disassembled after caulking and visually checked for cracks.
Tensile strength was measured by applying a tensile load to the hose with the joint fixed and gradually increasing the tensile load to pull out the hose. The evaluation was represented by an index display in which the tensile strength (load) when the hose is pulled out is 100 in a hose with a joint whose caulking rate is 55%. The larger the index value, the more difficult it is for the hose to come out of the joint.
The state of the nipple after the deterioration treatment was as follows. After the following deterioration treatment, the joint was disassembled and visually checked for cracks.
Deterioration treatment means placing a resin joint sample in a high-temperature, high-pressure, high-humidity environment for 216 hours on the premise of a glass fiber-containing resin joint, and removing the glass fiber in the resin joint. As a result, a sample having a cavity from which the glass fiber is removed can be obtained.

From the test results, it can be seen that if the surface pressure acting on the nipple is 100 MPa or less, the durability of the resin nipple can be ensured over a long period of time. It can also be seen that if the caulking rate is 60% or less, the durability of the resin nipple can be ensured over a long period of time.
The tensile strength of the hose is appropriately set according to the pressure of the fluid passed through the hose. As an example, when a hose with a joint is used for domestic water supply piping, the surface pressure is increased to 10 MPa or more. The fastening rate is preferably 30% or more.

When the second caulking portion 56 and the third caulking portion 58 are caulked, particularly when the third caulking portion 58 that applies the maximum surface pressure is caulked, the caulking is divided into a plurality of times. It is preferable to tighten and reduce the diameter of the sleeve 20 stepwise. As a result, the surface pressure rises stepwise with respect to the nipple 18, and the surface pressure is not increased rapidly by a single caulking operation, so that damage to the nipple 18 due to a sudden increase in surface pressure is suppressed. Can do.

The disclosure of Japanese Patent Application No. 2014-135209 filed on June 30, 2014 is incorporated herein by reference in its entirety.
All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually stated to be incorporated by reference, Incorporated herein by reference.

Claims

A hose,
A resin nipple provided with an insertion part to be inserted into the hose on one end side and a connection part connected to a connection target on the other end side,
A sleeve provided on an outer peripheral side of the insertion portion, and sandwiching the hose with the insertion portion;
A plurality of annular portions provided on an outer peripheral portion of the insertion portion and having different diameters;
A caulking portion formed on the sleeve and caulking the nipple;
With
With a joint, the surface pressure acting on the insertion portion received from the hose is a maximum value at a position facing the crimping portion, and the maximum surface pressure acting on the insertion portion is set to 100 MPa or less. hose.
2. The joint-attached hose according to claim 1, wherein the point of the maximum value of the surface pressure indicates a point where the distance between the crimped portion and the annular portion is shortest.
The caulking portion includes a convex curved surface portion that protrudes in a convex shape toward the annular portion and is formed in a convex curved shape toward the annular portion when viewed in a cross section along the axial direction. The hose with a joint according to claim 1 or 2.
The jointed hose according to any one of claims 1 to 3, wherein the nipple is formed of any one of polyphenylene sulfide, polybutylene terephthalate, polyacetal, and polyether ether ketone.
The hose with a joint according to any one of claims 1 to 4, wherein the hose is provided with an inner layer made of a polyolefin-based resin.
The inner surface of the sleeve of the caulking portion when viewing a cross section along the axial direction is provided with a first inclined portion on the side opposite to the tip side of the hose, and a second side on the tip side of the hose. It has an inclined part,
The hose with joint according to any one of claims 1 to 5, wherein an inclination angle of the second inclined portion with respect to an axial direction is set larger than an inclination angle of the first inclined portion.
The joint-attached hose according to any one of claims 1 to 6, wherein the caulking portion is formed on a side of the sleeve opposite to a side where the end portion of the hose is disposed. .
A plurality of the caulking portions are provided, and the caulking width of the caulking portion that is the shortest distance between the caulking portion and the annular portion is narrower than the caulking width of the other caulking portions. Item 8. The hose with a joint according to any one of Items 1 to 7.
A hose,
A resin nipple provided with an insertion part to be inserted into the hose on one end side and a connection part connected to a connection target on the other end side,
A sleeve provided on an outer peripheral side of the insertion portion, and sandwiching the hose with the insertion portion;
A plurality of annular portions provided on an outer peripheral portion of the insertion portion and having different diameters;
A plurality of crimping portions formed on the sleeve;
A method for manufacturing a hose with a joint comprising:
A method for manufacturing a hose with a joint, wherein the sleeve is swaged so that the narrowest width of the swaged portion is the shortest distance between the swaged portion and the annular portion.
The method for manufacturing a hose with a joint according to claim 9, wherein the caulking portion at one location is caulked in a plurality of times.