JP6377457B2 - Hose fittings - Google Patents

Description

  The present invention relates to a joint for a hose that is used by being attached to an end portion of a hose having a spiral groove formed on an outer peripheral surface.

  As the above-described hose and hose joint, for example, as shown in FIG. 16, a hose 40a including a hose wall 41a and a spiral reinforcing core 42a, and a joint 1a including a nipple 10a and a caulking sleeve 20a. Is mentioned. The nipple 10a is a metal cylinder, and includes a joint portion 11a that constitutes one end of the nipple 10a and an insertion portion 12a that extends from the joint portion 11a and is inserted into the hose 40a. On the outer peripheral surface 14a, an annular projection group 16a having a substantially serrated shape whose cross section in the axis J direction forms an acute angle toward the end opposite to the joint portion 11a is formed. The caulking sleeve 20a is a cylindrical body made of metal and has an inner diameter that can be fitted onto the outer peripheral surface 43a of the hose 40a. Then, after inserting the insertion portion 12a of the nipple 10a into the hose 40a, the crimping sleeve 20a is put on the region on the annular projection group 16a on the outer peripheral surface 43a of the hose 40a, and the crimping sleeve 20a is compressed to reduce the diameter. Thus, the nipple 10a and the hose 40a are fixedly connected.

  When the nipple 10a and the hose 40a are fixedly connected, the end portion of the hose 40a is compressed by the crimping sleeve 20a, so a part of the hose wall 41a enters the recess of the annular protrusion group 16a of the nipple 10a. The airtightness of the connecting portion between the hose 40a and the nipple 10a is increased. Even if a force for pulling out the hose 40a from the nipple 10a is applied, the portion of the hose wall 41a that has entered the concave portion of the annular projection group 16a is caught by the annular projection group 16a and counters the pulling force. It becomes difficult to remove from the nipple 10a.

  However, the joint 1a as shown in FIG. 16 has a drawback in that when the hose wall 41a is thin, the hose wall 41a is easily damaged by the protrusions of the annular protrusion group 16a and the hose 40a is easily broken. However, if the caulking force by the caulking sleeve 20a is weakened so that the hose wall 41a is not damaged by the annular projection group 16a, the hose 40a may come off from the nipple 10a. That is, it is extremely difficult to eliminate both the problems of the hose 40a breakage and the hose 40a disconnection only by adjusting the crimping force of the crimping sleeve 20a.

  Therefore, for example, in Patent Document 1, as shown in FIG. 17, a hose joint 1 b used by being attached to an end portion of a hose 40 b composed of a hose wall 41 b and a spiral reinforcing core 42 b, which constitutes a joint body A nipple 10b, a crimping sleeve 20b for fixing the hose 40b to the nipple 10b, and a coiled pressing contact member 30b fitted in a spiral groove 45b formed on the outer peripheral surface 43b of the hose 40b. A provided joint 1b has been proposed.

  The nipple 10b is a metal cylinder, and includes a joint portion 11b that constitutes one end of the nipple 10b and an insertion portion 12b that extends from the joint portion 11b and is inserted into the hose 40b. On the side of the joint portion 11b on the surface 14b, a concave groove 13b is formed along the circumferential direction of the insertion portion 12b. The caulking sleeve 20b is a metal cylinder, and has an inner diameter that can be fitted onto the outer peripheral surface 43b of the hose 40b. Then, after inserting the insertion portion 12b of the nipple 10b into the hose 40b, the pressing contact member 30b is disposed across the region on the concave groove 13b in the outer peripheral surface 43b of the hose 40b and the region adjacent to the region, and the pressing contact The nipple 10b and the hose 40b are fixedly connected by covering the crimping sleeve 20b so as to cover the member 30b and reducing the diameter of the crimping sleeve 20b by compression.

  In the case of such a structure, not only the crimping force between the outer peripheral surface 14b of the insertion portion 12b and the inner peripheral surface 44b of the hose wall 41b, but also from the inside of the concave groove 13b against the pulling force acting on the hose 40b. A cooperative resistance force is applied to the stepped portion 15b that moves to the outside of the concave groove 13b, including a force for receiving the inner peripheral surface 44b of the hose wall 41b. As a result, a strong bond is obtained between the joint 1b and the hose 40b, and the effect of preventing the large hose 40b from coming off is obtained. In addition, since the annular protrusion group having a substantially sawtooth cross section in the axis J direction is not formed on the outer peripheral surface 14b of the insertion portion 12b, the hose 40b is not easily broken due to the hose wall 41b being damaged.

JP 2001-317672 A Utility Model Registration No. 3039773 Japanese Patent Application Laid-Open No. 08-219350

By adopting the configuration described in Patent Document 1 described above, the joint 1b is obtained in which the hose 40b is not easily broken and has a large prevention effect. However, in addition to such an effect, there is a joint having a large watertight effect. The market wants to be developed.
Therefore, in view of the above-described problems, an object of the present invention is to provide a hose joint that is difficult to break and has a large hose removal prevention effect and also has a large watertight effect.

  In order to achieve the above object, a hose joint according to an aspect of the present invention is a hose joint used by being attached to an end portion of a hose having a spiral groove formed on an outer peripheral surface thereof. The nipple comprises: a crimping sleeve for fixing the hose to the nipple; and a coil-shaped pressing contact member fitted in the spiral groove of the hose, and the nipple is a metal cylindrical body And it has a joint part which constitutes one end of the nipple, and an insertion part which extends from the joint part and is inserted into the hose, and an annular concave groove is formed on the outer peripheral surface of the insertion part. The caulking sleeve is a metal cylinder and is formed with an inner diameter that can be fitted onto the outer peripheral surface of the hose. After the insertion portion of the nipple is inserted into the hose, the outer peripheral surface of the hose On the ditch The pressing contact member is disposed in a first region which is a region, and the hose and the pressing contact member are disposed so as to straddle the first region on the outer peripheral surface of the hose and the second region adjacent to the first region. The caulking sleeve is covered with the caulking sleeve, the caulking sleeve is reduced in diameter by compression, and the nipple and the hose are fixedly connected.

  In the joint for hoses according to one aspect of the present invention, the caulking sleeve covers not only the first region on the outer peripheral surface of the hose but also the second region adjacent to the first region, and the pressing contact member is present. In the first region, the hose wall of the hose can be partly strongly pressed against the outer peripheral surface of the nipple by the pressing contact member, and it has a high prevention effect, and in the second region where the pressing contact member does not exist, the inner periphery of the hose wall The surface can be brought into close contact with the outer peripheral surface of the nipple uniformly and over a wide range, and has a high water stop effect. Moreover, since the pressing contact member is not located at the boundary between the first region and the second region, the hose wall is not damaged and the hose is not broken due to the step portion of the boundary.

The side half sectional view of the state where the joint concerning one mode of the present invention was attached to the hose. The side half sectional view of a nipple. The rear view of a nipple. The front view of a nipple. The perspective view of a nipple. The side half sectional view of a caulking sleeve. The front view of a crimping sleeve. The side view of a pressing contact member. The front view of a pressing contact member. The side surface partial half sectional view of a hose. The front view of a hose. The side half sectional view of the state where the joint concerning modification 1 was attached to the hose. The side half sectional view of the state where the joint concerning modification 2 was attached to the hose. The side half sectional view of the state where the joint concerning modification 3 was attached to the hose. The side half sectional view of the state where the joint concerning modification 4 was attached to the hose. Side surface sectional drawing of the state which mounted | wore the hose with the coupling of the prior art example. Side surface sectional drawing of the state which mounted | wore the hose with the coupling of the prior art example.

Hereinafter, the joint for hoses concerning one mode of the present invention is explained, referring to drawings.
(Fitting for hose)
FIG. 1 is a side half sectional view of a state in which a joint according to an aspect of the present invention is mounted on a hose. As shown in FIG. 1, a hose joint 1 (hereinafter simply referred to as “joint 1”) according to an aspect of the present invention includes a nipple 10, a crimping sleeve 20, a pressing contact member 30, and the like. .

(nipple)
2 is a side half sectional view of the nipple, FIG. 3 is a rear view of the nipple, FIG. 4 is a front view of the nipple, and FIG. 5 is a perspective view of the nipple. As shown in FIGS. 2 to 5, the nipple 10 is a cylindrical body made of metal (for example, made of stainless steel (SUS)), and includes a joint portion 11 and an insertion portion 12. The nipple 10 is basically the same in shape as a conventional product. Therefore, the work contents are almost the same as in the prior art and no special skills are required, so that the work cost does not increase. Further, since the structure is simple, the manufacturing cost is low.

The joint part 11 is a part connected to a joint in another pipe material, various devices, or the like, and constitutes one end of the nipple 10. In addition, the joint part 11 is not limited to a shape as shown in FIG. 2, It is good also as what kind of shape according to the shape of the other party joint connected.
The insertion portion 12 is a portion that extends from the joint portion 11 and is inserted into the hose 40, and an outer diameter thereof is set according to the standard of the corresponding hose 40. Further, the insertion portion 12 has a so-called taper shape in which an end portion 18 on the side opposite to the joint portion 11 is tapered so that the outer diameter gradually decreases toward the tip. With this configuration, the insertion portion 12 can be easily inserted into the hose 40. Further, as shown in FIG. 1, a gap is formed between the outer peripheral surface 14 of the nipple 10 and the inner peripheral surface 44 of the hose wall 41 of the hose 40 in the vicinity of the end portion 18 as shown in FIG. The tip 19 of the end 18 does not easily hit the inner peripheral surface 44 of the hose wall 41 even when the hose wall 41 is damaged.

  In addition, although the part covered with the crimping sleeve 20 of the hose 40 does not bend, since the part which is not covered with the crimping sleeve 20 of the hose 40 bends greatly, it is not covered with the crimping sleeve 20 of the insertion part 12. It is preferable that the portion has a tapered shape. On the other hand, the portion covered with the crimping sleeve 20 must be water-stopped or prevent the hose 40 from coming off, so that the outer peripheral surface 14 of the insertion portion 12 and the inner peripheral surface 44 of the hose wall 41 are in close contact with each other. However, it is preferable that the shape is not tapered.

  As shown in FIG. 5, the outer peripheral surface 14 of the insertion portion 12 is a cylindrical surface, and an annular concave groove 13 is formed along the circumferential direction on the joint portion 11 side of the outer peripheral surface 14. Here, as shown in FIG. 2, let the area | region where the ditch | groove 13 in the outer peripheral surface 14 is formed be a 1st area | region. In addition, the concave groove 13 is easier to form on the outer peripheral surface 14 side than the side opposite to the joint portion 11.

  As shown in FIG. 1, an O-ring groove 17 is formed in a second region on the outer peripheral surface 14 opposite to the joint portion 11 and adjacent to the first region. Is fitted with an O-ring 50 for improving waterstop. However, the second region has no irregularities other than the portion where the O-ring groove 17 is formed, and the second region has a smooth cylindrical surface.

  Breakage of the hose 40 caused by the stepped portion 15 hitting the boundary portion between the first region and the second region, that is, the stepped portion 15 that moves from the inside of the recessed groove 13 to the outside of the recessed groove 13 and the hose wall 41 is damaged. Chamfering is performed to prevent this. In the present application, the concave groove 13 means a shape having a small diameter portion and a pair of large diameter portions existing on both sides in the axis J direction of the small diameter portion. A simple step having a large-diameter portion only on one side in the direction is not regarded as the concave groove 13.

On the bottom surface of the groove 13, an annular projection group 16 having a substantially serrated shape whose cross section in the axis J direction forms an acute angle toward the end opposite to the joint portion 11 is formed. Since the ring-shaped protrusion group 16 having a sawtooth cross section is formed, a strong coupling is obtained between the joint 1 and the hose 40 by the force of receiving the inner peripheral surface 44 of the hose wall 41 by the ring-shaped protrusion group 16, and a large A slip prevention effect is obtained.
(Casting sleeve)
6 is a side sectional view of the caulking sleeve, and FIG. 7 is a front view of the caulking sleeve. As shown in FIGS. 6 and 7, the crimping sleeve 20 is a metal cylinder manufactured using, for example, a metal tube made of the same material as that of the nipple 10, and is basically the same as the conventional product. is there. Since the crimping sleeve 20 is made of metal, it is possible to prevent stress relaxation due to the passage of time at the connecting portion between the nipple 10 and the hose 40.

The caulking sleeve 20 is formed to have a size that can be fitted to the outer peripheral surface 43 of the hose 40. Specifically, the inner diameter of the caulking sleeve 20 matches the standard of the corresponding hose 40. It is set to a value approximately equal to or slightly larger than the maximum outer diameter. Further, it is appropriate that the caulking sleeve 20 has the same thickness as the nipple 10 or slightly thinner.
As shown in FIG. 1, the width of the crimping sleeve 20 in the axis J direction is wider than the width of the concave groove 13 in the axis J direction, and the crimping sleeve 20 includes the first region and the first region on the outer peripheral surface 43 of the hose 40. The hose 40 is externally fitted to cover the two areas. In the crimped state, the outer peripheral surface 21 of the crimping sleeve 20 is a smooth cylindrical surface, and no step is formed in the axis J direction. Therefore, there is no level difference in the portion covering the boundary portion between the first region and the second region.

(Pressing contact member)
FIG. 8 is a side view of the pressing contact member. FIG. 9 is a front view of the pressing contact member. As shown in FIGS. 8 and 9, the pressing contact member 30 has a coil shape and is fitted in a spiral groove 45 formed in the outer peripheral surface 43 of the hose 40 as shown in FIG. 1. . Specifically, for example, the pressing contact member 30 has a coil shape formed by spirally winding a metal (for example, stainless steel (SUS)) wire having a circular cross-sectional shape, and before being attached to the nipple 10, It is screwed into the spiral groove 45 of the hose 40 from the end side of the hose 40 in advance. The cross-sectional shape of the pressing contact member 30 is not limited to a circle, and may be an ellipse, a rectangle, a trapezoid, or any other shape. Further, the pressing contact member 30 is not limited to metal, and may be formed of any material such as resin (for example, polypropylene (PP)).

  Further, the pressing contact member 30 has a coil wire diameter that is smaller than or slightly larger than the spiral groove 45 of the hose 40 within the cross section of the spiral groove 45. The pressing contact member 30 is less likely to be plastically deformed than the hose material, and a stronger pressure is applied between the pressing contact member 30 and the concave groove 13, which will be described in detail in the item of the “connecting structure of hose and joint” described later. In addition, a retaining effect can be achieved. As a result of reducing the diameter of the crimping sleeve 20 by compression, as shown in FIG. 1, the pressing contact member 30 remains in a spiral fitting state in the spiral groove 45 of the hose 40, and the nipple 10 is in the radially outward direction. The outermost peripheral part of the spiral of the pressing contact member 30 is located outside the outermost peripheral part of the concave groove 13, so that the effect of retaining can be achieved in the first region.

As another means, the coil wire diameter of the pressing contact member 30 is made larger than the depth of the concave groove 13. That is, by making the cross-sectional height H (see FIG. 8) of the wire constituting the pressing contact member 30 larger than the depth in the radial direction of the nipple 10 with respect to the concave groove 13, a retaining effect in the first region is achieved. You may do it.
The coil length of the pressing contact member 30, that is, the dimension of the pressing contact member 30 in the axis J direction is smaller than the groove width of the concave groove 13, that is, the dimension of the concave groove 13 in the axis J direction. And the press contact member 30 is arrange | positioned in the 1st area | region on the ditch | groove 13 in the outer peripheral surface 43 of the hose 40, and the one part is not arrange | positioned in the 2nd area | region adjacent to a 1st area | region. Thus, since the pressing contact member 30 is within the first region, the hose wall 41 is not easily damaged by the step portion 15.

The pressing contact member 30 employs a method in which the pressing contact member 30 is helically fitted to the outer peripheral surface 43 of the hose 40 along the spiral groove 45, and need not be a custom-made product prepared for each size of the hose 40.
(hose)
FIG. 10 is a side partial half sectional view of the hose, and FIG. 11 is a front view of the hose. As shown in FIG. 10, the hose 40 includes a hose wall 41 containing a reinforcing yarn having a pressure-resistant structure, and a spiral reinforcing core 42 provided outside the hose wall 41. The outer peripheral surface 43 of the hose 40 is formed in a spiral concavo-convex shape, and a spiral groove 45 is formed between spiral ridges formed by the spiral reinforcing core 42.

(Hose and joint connection structure)
Returning to FIG. 1, the coupling 1 and the hose 40 are connected in advance by fitting the pressing contact member 30 into the spiral groove 45 of the outer peripheral surface 43 of the hose 40 in advance for at least one turn, preferably one turn and a half or more. In addition, the crimping sleeve 20 is fitted on the hose 40, and after the insertion portion 12 of the nipple 10 is inserted into the hose 40, the pressing contact member 30 is disposed in the first region, and the crimping sleeve 20 is It arrange | positions so that the press contact member 30 may be covered over 1 area | region and 2nd area | region.

Next, the crimping sleeve 20 is compressed by deforming the crimping sleeve 20 toward the nipple 10 by applying pressure to the crimping sleeve 20 from the periphery toward the center of the hose 40 using a not-shown crimping claw or the like. The hose 40 is crimped onto the nipple 10 by reducing the outer diameter and the inner diameter of the nipple 10, and the nipple 10 and the hose 40 are fixedly connected.
When the crimping sleeve 20 is crimped, the pressing contact member 30 remains spirally fitted in the spiral groove 45 of the hose 40, and the coil diameter of the pressing contact member 30 becomes smaller. The hose wall 41 located is deformed so as to be pushed into the concave groove 13 and exhibits an anchor effect. For this reason, the hose 40 acting on the hose 40 can be more strongly resisted by the pulling force to be pulled out, and the hose 40 can be hardly pulled out from the nipple 10. As a result of this, the outermost peripheral part of the spiral of the pressing contact member 30 is located outside the outermost peripheral surface of the groove 13 in the radially outward direction of the nipple.

  When the pressing contact member 30 is made of metal (for example, stainless steel) and the spiral reinforcing core 42 constituting the spiral ridge of the hose 40 is made of hard resin (for example, hard vinyl chloride), When tightened, the coil wire diameter of the pressing contact member 30 is not reduced, but the reinforcing core is crushed in the radial direction of the nipple 10. Therefore, even when the coil wire diameter of the pressing contact member 30 is smaller than the depth of the spiral groove 45 of the hose 40 (that is, the radial dimension of the nipple 10 of the spiral groove 45), the outermost spiral of the pressing contact member 30 It is possible to realize a structure in which the portion is brought into contact with or bites into the inner peripheral surface of the crimping sleeve 20. If it does so, when the crimping sleeve 20 is crimped, the press contact member 30 can firmly compress and press the hose wall 41 to the nipple 10.

  When the coil wire diameter of the pressing contact member 30 is smaller than the depth of the spiral groove 45 of the hose 40, the pressing contact member 30 is brought into contact with the inner peripheral surface of the crimping sleeve 20 when crimped. For this purpose, the difference between the coil wire diameter of the pressing contact member 30 and the depth of the spiral groove 45 is preferably 1 mm or less. The ratio of the coil wire diameter of the pressing contact member 30 to the depth of the spiral groove 45 is preferably 80% or more.

  As another means, the coil wire diameter of the pressing contact member 30 can be set larger than the depth of the concave groove 13. Even in this case, the hose wall 41 is formed at the location where the pressing contact member 30 exists in the first region by caulking the caulking sleeve 20 so as to reduce the diameter almost uniformly over the entire axis J direction. It deform | transforms so that it may be pushed in into the ditch | groove 13, and the omission of the hose 40 is prevented reliably. This is because the coil wire diameter of the pressing contact member 30 is larger than the depth of the concave groove 13, and the pressing contact member 30 is located at the location where the pressing contact member 30 exists in the first region by the difference. This is because the bite enters the hose wall 41. When the pressing contact member 30 is made of metal and the spiral reinforcing core is made of a hard resin, the pressing contact member 30 is more difficult to be deformed than the spiral ridge formed by the spiral reinforcing core 42, and thus the pressing contact member 30. Is easy to bite into the hose wall 41.

At the place where the pressing contact member 30 is caught, the hose wall 41 is compressed and deformed by a compressive force larger than that of the second region and enters the concave groove, and the hose wall 41 is anchored to the nipple 10.
In any case, the diameter of the pressing contact member 30 can be reduced by simply crimping the crimping sleeve 20 so that the diameter of the crimping sleeve 20 is substantially uniformly reduced over the entire axis J direction. By deforming 41 and entering into the recessed groove 13, the hose 40 can be reliably prevented from coming off.

The amount that the pressing contact member 30 bites into the hose wall 41 can be adjusted by the difference between the depth of the concave groove 13 and the coil wire diameter of the pressing contact member 30, and the biting amount increases as the difference increases. Become.
In the axis J direction, the pressing contact member 30 is accommodated in the concave groove 13, so that the protruding amount of the pressing contact member 30 from the outer peripheral surface 14 of the insertion portion 12 is relatively small. Accordingly, it is difficult for irregularities to occur on the outer peripheral surface 21 of the crimping sleeve 20 that is crimped from above. Thereby, the joint 1 has a high design property, and is hard to be injured when the joint 1 is gripped.

  In addition, when the coil wire diameter of the pressing contact member 30 is larger than the depth of the concave groove 13, if the difference is large, the effect of preventing the hose 40 from coming off is sufficiently exhibited, and if the difference is small, the crimping sleeve No step is likely to occur on the outer peripheral surface 21 of the 20, and the design of the crimping sleeve 20 after finishing is high. 6 and 7, the shape before crimping the crimping sleeve 20 is indicated by a two-dot chain line, and the shape after crimping is indicated by a solid line, but no step is generated on the outer peripheral surface 21.

  In the joint 1, the diameter of the metal crimping sleeve 20 is reduced by compression so that the hose wall 41 is crimped to the nipple 10, so that the initial tightening pressure does not gradually loosen over time. Since the initial tightening pressure is maintained for a long time, it can be used with confidence. In addition, the hose 40 is difficult to come off due to the presence of the concave groove 13 and the pressing contact member 30. Furthermore, the hose 40 is not easily pulled out even if the amount of crimping is small due to the cooperative action of the annular projection group 16 formed on the bottom surface of the concave groove 13 and the pressing contact member 30. In addition, even if the hose 40 moves slightly away from the nipple 10, the pressing contact member 30 disposed in the concave groove 13 is caught by the stepped portion 15, and thus the stepped portion 15 and the pressing contact member 30. The hose 40 is difficult to come off due to the cooperative action. Therefore, for example, it is not necessary to adopt a structure that makes it difficult for the hose 40 to be pulled out by folding the end portion of the crimping sleeve 20 on the joint portion 11 side so as to be caught by the nipple 10. Designability does not deteriorate.

  The coil length of the pressing contact member 30, that is, the dimension of the pressing contact member 30 in the axis J direction is smaller than the groove width of the concave groove 13, that is, the dimension of the concave groove 13 in the axis J direction. The hose 40 is disposed in the first region on the concave groove 13 on the outer peripheral surface 43, and even a part of the second region is not disposed in the second region adjacent to the first region. Therefore, it is unlikely that the pressing contact member 30 rides on the stepped portion 15 and bites into the hose wall 41 and damages the hose wall 41 to reduce the water stoppage.

  The coil length of the pressing contact member 30 is such that when the crimping sleeve 20 is crimped, the pressing contact member 30 is sufficiently accommodated in the first region even if the coil length of the pressing contact member 30 is extended. It is preferable that the short dimension has a margin. In other words, the coil length of the pressing contact member 30 is preferably shorter with a margin than the width of the concave groove 13 in the axis J direction. If the length is not short enough, there is a possibility that the pressing contact member 30 extends in the axis J direction and rides on the stepped portion 15 of the concave groove 13 when crimped. There is a possibility that the hose wall 41 is damaged due to a large load applied to the hose wall 41 sandwiched between the two.

  In the second region, the inner peripheral surface 44 of the hose wall 41 is pressure-bonded to the smooth cylindrical surface of the outer peripheral surface 14 of the insertion portion 12, so that the inner peripheral surface 44 and the insertion portion of the hose wall 41 are spread over a wide range. 12 outer peripheral surfaces 14 can be brought into surface contact with each other, and a large water stop effect can be obtained. In addition, in the second region, the crimping sleeve 20 is crimped uniformly and over a wide range, so that the hose wall 41 is hardly damaged. Therefore, even if the hose wall is embedded with the reinforcing yarn, it is difficult for the reinforcing yarn to be pressed and cut by the pressing contact member 30. Since the water can be sufficiently stopped in the second region, the amount of caulking can be increased in consideration of only the retaining of the hose 40 without worrying about the hose wall 41 being damaged in the first region.

  If the hose 40 is exposed to a high-temperature atmosphere (for example, 80 ° C.) and the hose wall 41 is softened and the strength is reduced, the force for stretching the hose wall 41 is lost and the hose 40 is displaced and water leakage occurs. In addition, there is a possibility that when the pressure is applied, only the hose 40 is pulled by the water pressure and the nipple 10 is pulled out. In the joint 1, since the substantially serrated annular projection group 16 is formed, the hose 40 hardly moves. However, even if the hose 40 is displaced from the nipple 10, the step difference from the pressing contact member 30. Since the pressure on the hose wall 41 is newly applied at the stepped portion 15 due to the interference with the portion 15, the disconnection is prevented. Since the water stop is mainly performed in the second region, water leakage does not occur unless the hose 40 moves.

  If the caulking sleeve covers only the first region and does not cover the second region as in the joint described in Patent Document 2, both the hose retaining and water stoppage are performed only in the first region. There is no choice but to do. However, it is very difficult to sufficiently perform both the stopper and the water stop under the condition that the caulking sleeve must be tightened with a force suitable for either the stopper or the water stop. On the other hand, in the joint according to the present invention, the caulking sleeve covers not only the first region but also the second region, and therefore the caulking sleeve 20 can be caulked with a force suitable for retaining in the first region. In the second region, the caulking sleeve 20 can be caulked with a force suitable for water stopping, so that both the retaining and water stopping can be sufficiently performed.

  Further, if a spiral concave groove having a narrow groove width is formed on the outer peripheral surface of the nipple as in the joint described in Patent Document 3, the first region on the concave groove and the upper surface of the concave groove are formed on the outer peripheral surface of the hose. The second regions that are not alternately exist with a narrow width. However, in such a configuration in which the second regions are alternately present with a narrow width and an interval, it is difficult to sufficiently stop the water because the width of the second region is not sufficient. On the other hand, in the joint according to the present invention, the entire pressing contact member is accommodated in one concave groove, and there is only one first region, so that the second region having a wide width gathered in the axial direction. The water can be sufficiently stopped in the second region.

(Modification)
The present invention is not necessarily limited to the structure of the joint 1 according to one aspect of the present invention, and includes the structural requirements of the present invention, achieves the object of the present invention, and appropriately modifies the scope of the present invention. Can be implemented.
For example, the joint 1 according to one aspect of the present invention has been used for a pressure-resistant structure hose using a hose wall 41 containing a reinforcing yarn, but it goes without saying that the joint according to the present invention can also be used for other hoses. Yes.

  In the joint 1 according to one aspect of the present invention, the O-ring groove 17 is formed on the outer peripheral surface 14 of the nipple 10. However, the O-ring groove 17 is not necessarily required for the joint according to the present invention. Therefore, for example, a configuration in which an O-ring groove is not formed on the outer peripheral surface 14 of the nipple 110 as in the joint 101 according to the first modification shown in FIG. With such a configuration, the nipple 110 can have a simpler shape.

The joint 101 according to the first modification basically has the same configuration as that of the joint 1 according to one aspect of the present invention except that the O-ring groove 17 is not formed. In FIG. 12, the same code | symbol as the one aspect | mode of the said invention is attached | subjected to the component similar to the coupling 1 which concerns on the one aspect | mode of the said invention.
Moreover, in the joint 1 which concerns on the one aspect | mode of the said invention, the ditch | groove 13 is formed in the joint part 11 side in the outer peripheral surface 14 of the insertion part 12, and a 2nd area | region and the joint part 11 with respect to a 1st area | region. However, the positional relationship between the first region and the second region is not limited thereto in the joint according to the present invention. Therefore, for example, like the joint 201 according to the second modification illustrated in FIG. 13, the second region may be positioned on the joint portion 11 side with respect to the first region. The concave groove 13 is formed on the opposite side of the joint portion 11 from the center in the axis J direction on the outer peripheral surface 14 of the insertion portion 12 of the nipple 210, and the pressing contact member 30 is formed on the outer peripheral surface 43 of the hose 40. It arrange | positions in the 1st area | region used as the groove 13. The O-ring groove 17 is formed in the vicinity of the center in the axis J direction on the outer peripheral surface 14 of the insertion portion 12 of the nipple 310, and is formed closer to the joint portion 11 than the concave groove 13. In a state where the crimping sleeve 20 is fitted on the outer peripheral surface 43 of the hose 40, the concave groove 13 and the pressing contact member 30 are located on the opposite side of the crimping sleeve 20 from the joint portion 11. Even in such a configuration, the hose 40 can be sufficiently prevented from coming off in the first region, and water can be sufficiently stopped in the second region.

  Further, for example, as in the joint 301 according to Modification 3 shown in FIG. 14, the second region is located on both the joint portion 11 side and the opposite side to the joint portion 11 with respect to the first region. May be. The concave groove 13 is formed near the center in the axis J direction on the outer peripheral surface 14 of the insertion portion 12 of the nipple 310, and the pressing contact member 30 is on the concave groove 13 on the outer peripheral surface 43 of the hose 40. Arranged in the area. In a state where the crimping sleeve 20 is externally fitted to the outer peripheral surface 43 of the hose 40, the concave groove 13 and the pressing contact member 30 are located near the center in the axis J direction of the crimping sleeve 20. Note that no O-ring groove is formed on the outer peripheral surface 14 of the nipple 110. Even with such a configuration, the hose 40 can be sufficiently prevented from coming off in the first region, and water can be sufficiently stopped in the two second regions.

The joint 201 according to the modification 2 and the joint 301 according to the modification 3 are basically the same as the joint 1 according to one aspect of the present invention except that the arrangement of the first region and the second region is different. It has a configuration. In FIG. 13 and FIG. 14, the same code | symbol as the one aspect | mode of the said invention is attached | subjected to the component similar to the coupling 1 which concerns on the one aspect | mode of the said invention.
Further, in the joint 1 according to one aspect of the present invention, the annular protrusion group 16 is formed on the bottom surface of the concave groove 13, but the annular protrusion group 16 is not necessarily formed on the bottom surface of the concave groove 13 of the joint according to the present invention. Need not be formed. Therefore, for example, a configuration in which the annular protrusion group is not formed on the bottom surface of the groove 413 as in the joint 401 according to Modification 4 shown in FIG. For example, in the joint 401 according to the modified example 4, a concave groove 413 having a flat bottom surface is formed on the outer peripheral surface 14 of the insertion portion 12 of the nipple 410, and the concave groove 413 in a cross-sectional view cut along a plane including the axis J is formed. The bottom surface of is straight. With such a configuration, the nipple 410 can have a simpler shape.

  As described above, even when the annular protrusion group is not formed on the bottom surface of the concave groove 413, if a strong bond is obtained between the joint 1 and the hose 40, a great drop prevention effect can be obtained. For example, in a state where the crimping sleeve 20 is reduced in diameter by compression, a configuration in which the outermost peripheral portion of the spiral of the pressing contact member 30 is positioned outside the outermost peripheral portion of the concave groove 413 in the radially outward direction of the nipple 410, It is preferable to adopt a configuration in which the coil wire diameter of the pressing contact member 30 is larger than the depth of the concave groove 413 in order to obtain a strong connection between the joint 1 and the hose 40.

  Note that the joint 401 according to the modified example 4 basically has the same configuration as the joint 1 according to one aspect of the present invention except that the annular protrusion group is not formed on the bottom surface of the concave groove 413. In FIG. 15, the same reference numerals as those of the above-described aspect of the present invention are attached to the same components as those of the joint 1 according to the aspect of the present invention.

  The present invention can be widely used as a joint for hoses.

DESCRIPTION OF SYMBOLS 1 Joint 10 Nipple 11 Insertion part 12 Joint part 13 Concave groove 14 Outer peripheral surface 16 Annular projection group 20 Clamping sleeve 21 Outer peripheral surface 30 Press contact member 40 Hose 43 Outer peripheral surface 45 Spiral groove

Claims (6)

  A hose joint used by being attached to the end of a hose having a spiral groove formed on the outer peripheral surface, the nipple constituting the joint body, and a crimping sleeve for fixing the hose to the nipple, A coil-shaped pressing contact member fitted in the spiral groove of the hose, and the nipple is a metal cylindrical body, and extends from the joint portion constituting one end of the nipple and the joint portion. An insertion portion inserted into the hose, and an annular concave groove is formed on an outer peripheral surface of the insertion portion, and the crimping sleeve is a metal cylinder, and the outer periphery of the hose The pressing contact member is disposed in a first region that is a region on the concave groove on the outer peripheral surface of the hose after the insertion portion of the nipple is inserted into the hose. And outside of the hose Covering the first hose and the pressing contact member over the first region on the surface and the second region adjacent to the first region, and reducing the diameter of the crimping sleeve by compression, A hose joint having a structure in which a nipple and the hose are fixedly connected.   The hose coupling according to claim 1, wherein a substantially serrated annular projection group is formed on a bottom surface of the concave groove.   The spiral outermost peripheral portion of the pressing contact member is located outside the outermost peripheral portion of the concave groove in the radially outward direction of the nipple in a state where the diameter of the crimping sleeve is reduced by compression. Hose fittings.   The joint for hoses according to claim 1, wherein a coil wire diameter of the pressing contact member is larger than a depth of the concave groove.   The hose coupling according to claim 1, wherein no step is formed in the axial direction on the outer peripheral surface of the caulking sleeve.   The hose joint according to any one of claims 1 to 5, wherein the concave groove is formed on the joint portion side of the outer peripheral surface of the insertion portion.

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