JP7431095B2 - Sleeve connection structure and hose joint manufacturing method - Google Patents

Description

The present disclosure relates to a sleeve connection structure that connects a base sleeve connected to a pipe, tank, or other equipment connection part and a nozzle sleeve connected to a hose, and a method for manufacturing a hose joint equipped with the sleeve connection structure. .

As this type of sleeve connection structure, the first connection cylinder part provided at the tip of the base sleeve is inserted into the second connection cylinder part provided at the base end of the nozzle sleeve, and the first connection cylinder part is inserted into the second connection cylinder part provided at the base end of the nozzle sleeve. There is known a device in which a second connecting tube portion and a second connecting tube portion are fitted together (for example, Patent Document 1).

JP 2019-108981 (Paragraph [0033], Figure 2)

In the above-mentioned conventional sleeve connection structure, when a load is applied to the nozzle section provided at the tip side of the nozzle sleeve, the second connection tube section may tilt with respect to the first connection tube section, and countermeasures are required. ing.

A first aspect of the invention made in order to solve the above problems is a device connecting tube connected to a pipe, tank or other device connection at the proximal end of the step-tapered first connecting tube. and a nozzle sleeve having a nozzle part to which a hose is connected at the tip of a second connecting cylinder part whose inner side is expanded in diameter in a stepped manner, and a nozzle sleeve having a nozzle part to which a hose is connected. a second connecting cylinder part is fitted, and an O-ring is disposed between a first base side step surface and a first nozzle side step surface of the first connecting cylinder part and the second connecting cylinder part, which are opposite to each other; A first base-side circumferential surface of the first connecting cylinder portion extends from the first base-side stepped surface toward the distal end, and a first base-side circumferential surface of the second connecting cylinder portion extends from the first nozzle-side stepped surface toward the proximal end side. 1 nozzle side circumferential surface, and of the first connecting cylinder part and the second connecting cylinder part, the first connecting cylinder part is located on the proximal end side of the first base side stepped surface. In a sleeve connection structure in which a concave-convex engaging portion that engages with each other overcoming the diameter expansion deformation of the two connecting cylinder portions is provided,
Among the first connecting cylinder part and the second connecting cylinder part, on the distal end side from the step surface on the first nozzle side, there is a tapered fitting part whose diameter decreases toward the distal end and which fit into each other, and the tapered fitting part. The sleeve connection structure includes a fitting support part located on the proximal side of the fitting part and having at least one peripheral surface parallel to the axial direction.

A second aspect of the invention is that the fitting support portion of the first connecting cylinder portion protrudes from the first base side circumferential surface and has an arcuate, trapezoidal, or triangular cross section. The sleeve connection structure according to the first aspect has a slope extending in the circumferential direction of the sleeve and having a slope on the distal end side that extends in the circumferential direction and continues to the tapered surface of the tapered fitting part of the first connecting cylinder part .

A third aspect of the invention is that the fitting support part of the first connecting cylinder part protrudes from the first base side circumferential surface and has an arcuate, trapezoidal, or triangular cross section. extending in the circumferential direction and abutting on the fitting support part of the second connecting cylinder part, and having the tightest fit among all the fitting parts between the first connecting cylinder part and the second connecting cylinder part. The sleeve connection structure according to the first aspect or the second aspect is fitted.

In a fourth aspect of the invention , the fitting support part of the first connecting cylinder part protrudes from the first base side circumferential surface and has an arcuate, trapezoidal, or triangular cross section. The fitting support part of the second connecting cylinder part is a protrusion or a protrusion that extends in the circumferential direction of the second connecting cylinder part and engages with the fitting support part of the first connecting cylinder part to restrict movement in the axial direction. The sleeve connection structure according to any one of the first to third aspects , having a recess.

A fifth aspect of the invention is the first to fourth aspects , wherein the axial length of the fitting support part is equal to or longer than the distance between the first base side stepped surface and the first nozzle side stepped surface. The sleeve connection structure according to any one of the aspects .

A sixth aspect of the invention is that the tapered surface of the tapered fitting portion of the first connecting cylindrical portion and the tapered surface of the tapered fitting portion of the second connecting cylindrical portion become closer to the fitting support portion. The sleeve connection structure according to any one of the first to fifth aspects , which has slopes that are different from each other so as to approach each other.

A seventh aspect of the invention includes a hood sleeve having a third connecting cylinder part fitted on the outside of the second connecting cylinder part at a base end of the hood part surrounding the nozzle part, and the third connecting cylinder part is fitted outside the second connecting cylinder part. The proximal end surface of the part is located midway in the axial direction of the first connecting cylindrical part, and the proximal end of the third connecting cylindrical part projects from the second connecting cylindrical part toward the device connecting cylindrical part, A concave-convex engaging portion that fits into the base end portion of the first connecting cylinder portion, and in the fitting portion thereof, the first connecting cylinder portion overcomes the diameter expansion deformation of the third connecting cylinder portion and engages with each other. The sleeve connection structure according to any one of the first to sixth aspects is provided with.

An eighth aspect of the invention is a method for manufacturing a hose joint including the sleeve connection structure according to the second aspect , wherein an O-ring is fitted to the first base side circumferential surface, and the first connection cylinder part In this method of manufacturing a hose joint, the second connecting cylinder part is fitted to the outside of the first connecting cylinder part in a state where the fitting support part prevents the second connecting cylinder part from coming off.

In the sleeve connection structure according to the first aspect of the invention , the first connection cylinder part is inserted into the second connection cylinder part, and the first connection cylinder part and the second connection cylinder part are sealed with an O-ring and an O-ring. The concavo-convex engaging portion disposed on the base end side of the ring and the fitting support portion disposed on the distal end side of the O-ring are fitted together. The fitting support part is configured such that at least one of the first connecting cylinder part and the second connecting cylinder part has a circumferential surface parallel to the axial direction and is fitted, and when a load is applied to the nozzle sleeve, the second connecting cylinder part is fitted. The axial or radial displacement of the cylindrical portion with respect to the first connecting cylindrical portion is restricted. Thereby, it is possible to prevent the second connecting cylinder from being tilted with respect to the first connecting cylinder and loosening the engagement of the concavo-convex engaging part. For example, the fitting support part may have one side configured with a circumferential surface parallel to the axial direction, and the other side protrude from the circumferential surface with an arcuate, trapezoidal, or triangular cross section and extend in the circumferential direction. ( second aspect of the invention ), and both of the first connecting cylinder part and the second connecting cylinder part may be configured with circumferential surfaces parallel to the axial direction.

If the fitting support part of the first connecting cylinder part has a shape that protrudes from the circumferential surface of the first connecting cylinder part and extends in the circumferential direction as in the second aspect of the invention , no load is applied to the nozzle sleeve. At this time, the fitting support part of the first connecting cylinder part contacts and is fixed to the fitting support part of the second connecting cylinder part, and displacement in the axial direction or the radial direction can be reliably regulated.

Moreover, as in the second aspect of the invention , the fitting support part of the first connecting cylinder part protruding from the circumferential surface of the first connecting cylinder part has an inclined surface continuous with the tapered surface of the first connecting cylinder part on the distal end side. With this configuration, the fitting support part of the first connecting cylinder part can be easily inserted by being guided by the tapered surface of the first connecting cylinder part until it reaches the fitting support part of the second connecting cylinder part. .

Here, the fitting support part of the first connecting cylinder part protruding from the circumferential surface of the first connecting cylinder part comes into contact with the circumferential surface parallel to the axial direction of the fitting support part of the second connecting cylinder part, and If the structure is such that the first connecting cylinder part and the second connecting cylinder part are fitted with the tightest fit among all the fitting parts ( third aspect of the invention ), the first connecting cylinder part of the second connecting cylinder part It is possible to restrict displacement in the axial direction or radial direction with respect to the section. As a result, the fitting support part of the first connecting cylinder part is fixed to the circumferential surface of the fitting support part of the second connecting cylinder part, and the engagement of the uneven engaging part is loosened and the fitting support part of the first connecting cylinder part is loosened. It is possible to further suppress tilting of the two connecting cylinder portions. Further, the fitting support part of the first connecting cylinder part that protrudes from the circumferential surface of the first connecting cylinder part is a protrusion or a recess that the fitting support part of the second connecting cylinder part has, as in the fourth aspect of the invention. It may be configured to engage with.

In the sleeve connection structure of the fifth aspect of the invention , the axial length of the fitting support portion is equal to or longer than the distance between the first base side step surface and the first nozzle side step surface. As a result, even if the base end of the second connecting tube section moves in the direction away from the first connecting tube section (specifically, the nozzle engagement groove described later), the fitting support section will allow the second connection tube to move away from the first connecting tube section (more specifically, the nozzle engagement groove described later) Movement of the base end portion of the cylindrical portion is restricted, and it is possible to suppress the second connecting cylindrical portion from tilting with respect to the first connecting cylindrical portion.

In addition, the sleeve connection structure of the present disclosure also includes a tapered fitting portion that decreases in diameter toward the tip end from the fitting support portion in the first connection tube portion and the second connection tube portion, and that fits into each other. It is equipped. In the tapered fitting part, the tapered surface of the first connecting cylinder part becomes a guide surface when the distal end of the first connecting cylinder part is inserted from the proximal opening of the second connecting cylinder part, and the tapered surface of the first connecting cylinder part serves as a guide surface. Since the inner surface of the connector can be inserted all the way to the guide surface, the first connecting cylinder part and the second connecting cylinder part can be easily fitted together.

Here, as in the sleeve connection structure of the sixth aspect of the invention , the tapered surface of the first connecting cylinder part and the tapered surface of the second connecting cylinder part have different slopes such that they approach each other as they approach the fitting support part. With this configuration, when the two are fitted together, the first connecting cylinder part and the second connecting cylinder part come close to each other at the base end of the tapered fitting part, so that no load is applied to the nozzle sleeve. Sometimes, the first connecting cylinder part and the second connecting cylinder part are fixed even more firmly.

Furthermore, by adopting the configuration according to the second aspect of the invention , when the O-ring is inserted into the first connecting cylinder part from the proximal opening of the second connecting cylinder part, the first connecting cylinder part The O-ring can be prevented from coming off by the fitting support portion ( eighth aspect of the invention ). Furthermore, when attaching the O-ring to the first connecting tube, the O-ring can be easily attached from the tip of the first connecting tube by using the tapered surface of the first connecting tube.

The sleeve connection structure according to the seventh aspect of the invention includes a hood sleeve having a third connection cylinder part fitted on the outside of the second connection cylinder part, and the third connection cylinder part is connected to the base of the second connection cylinder part. The first connecting cylinder part and the third connecting cylinder part protrude toward the device connection part side from the end part, and the first connecting cylinder part has a concave-convex engagement in which the first connecting cylinder part overcomes the diameter expansion deformation of the third connecting cylinder part and engages with each other. A section has been established. As a result, the third connecting cylinder part is stacked on the outside of the second connecting cylinder part, and the base end of the second connecting cylinder part can move in the direction away from the first connecting cylinder part (nozzle engagement groove). Therefore, it is possible to prevent the second connecting cylinder from tilting with respect to the first connecting cylinder due to loosening of the engagement between the first connecting cylinder and the second connecting cylinder.

A perspective view of a hose joint according to the first embodiment Side sectional view of hose joint (A) Perspective view of the hose clamp, (B) Front view of the hose clamp in a diameter-reduced state, (C) Front view of the hose clamp in a diameter-enlarged state Perspective view of clip (A) Side view and (B) top view of the clip attached to the hose clamp Side view of the clip when removed from the hose clamp Exploded perspective view of hose joint Enlarged side sectional view of hose joint (A) Side sectional view of the hood sleeve and nozzle sleeve, (B) Side sectional view of the nozzle sleeve and base sleeve connected to the hood sleeve (A) Side sectional view with the O-ring engaged in the annular engagement groove, (B) Side sectional view with the base sleeve and nozzle sleeve fully engaged Enlarged side sectional view of the hose joint in which the first connecting cylinder part and the second connecting cylinder part are loosely engaged (A) An enlarged side sectional view of a hose fitting according to the third embodiment, (B) An enlarged side sectional view of a hose fitting of another embodiment, (C) An enlarged side sectional view of a hose fitting of another embodiment. Enlarged side sectional view of the hose joint of the fourth embodiment

[First embodiment]
The hose joint 10 of the first embodiment will be described below based on FIGS. 1 to 11. The hose joint 10 of the first embodiment is for connecting a hose 90 to a pipe, a tank, or other equipment connection part, and as shown in FIG. 1, the base sleeve is connected to an equipment connection part (not shown). 20, a nozzle sleeve 11 connected to the hose 90, and a hood sleeve 30 surrounding the nozzle sleeve 11, and the hose 90 is fixed to the nozzle sleeve 11 within the hood sleeve 30, as shown in FIG. A hose clamp 50 is housed therein. In the first embodiment, in the hose joint 10, the side where the hose 90 is inserted is called the distal end side, and the side where the device connection part is connected is called the proximal end side.

The base sleeve 20 includes a flange portion 20F having a regular hexagonal cross-sectional shape at an axially intermediate portion of the outer surface. Further, of the outer surface of the base sleeve 20, the proximal end side from the flange portion 20F is a threaded portion 20N that is connected to the device connection portion, and the distal side from the flange portion 20F is a nozzle as shown in FIG. The first connecting cylinder part 21 is rotatably fitted to the sleeve 11. Note that the proximal end side of the flange portion 20F corresponds to the “equipment connection cylinder portion” in the claims.

As shown in FIG. 2, the nozzle sleeve 11 is provided with a nozzle part 12 on its distal end side into which the hose 90 is fitted, and has a larger diameter than the nozzle part 12 on its proximal end side and has a first connection of the base sleeve 20. A second connecting cylinder part 13 that fits into the cylinder part 21 is provided. Note that a plurality of annular protrusions 12A are formed on the outer surface of the nozzle portion 12 to be engaged with the inner surface of the hose 90.

As shown in FIG. 2, the hood sleeve 30 includes a hood part 31 that surrounds the nozzle part 12 of the nozzle sleeve 11 on the distal end side, and a hood part 31 that surrounds the nozzle part 12 of the nozzle sleeve 11 on the proximal end side. A cylindrical third connecting cylinder part 32 that fits into the twenty first connecting cylinder parts 21 is provided. The detailed structure and fitting structure of the first connecting cylinder part 21, the second connecting cylinder part 13, and the third connecting cylinder part 32 will be explained in detail later.

The hood part 31 has a bulge part 37 that extends in the axial direction from the third connecting cylinder part 32 and is formed by protruding one part of the peripheral wall of the third connecting cylinder part 32 outward in a box shape. A cap 70 is attached to the opening.

As shown in FIG. 2, the cap 70 includes a lid portion 71 that closes the distal opening of the hood portion 31 of the hood sleeve 30, and extends from the lid portion 71 toward the proximal end and overlaps the outer and inner surfaces of the hood portion 31. It includes an outer fitting part 72 and an inner fitting part 73. The lid portion 71 includes a through hole 71A in the center thereof through which the hose 90 is inserted. The inner fitting portion 73 includes a hose fitting surface 73A that communicates with the through hole 71A and fits into the inserted hose 90. It should be noted that, of the inner fitting portion 73, an engagement protrusion 74 (see FIG. 1) formed on the outer surface overlapped with the inner surface of the hood portion 31 and an engagement hole 30N formed in the hood portion 31 (see FIG. 7) ), the cap 70 is fixed to the hood sleeve 30.

Further, as shown in FIG. 2, the inner surface of the hood portion 31 is provided with a cap abutting portion 38A at a position near the tip and in a portion that does not constitute the bulge portion 37. The cap abutting portion 38A is constituted by a step that expands the diameter of the inner surface of the distal end portion of the hood portion 31 to the distal end, and extends continuously along the circumferential direction. When the cap 70 is attached to the hood sleeve 30, the proximal end portion of the inner fitting portion 73 of the cap 70 is abutted against the cap contact portion 38A.

Further, the inner surface of the hood portion 31 is provided with an axial movement restricting portion 38B protruding in the radial direction at a portion closer to the proximal end than the cap abutting portion 38A and not forming the bulging portion 37. The axial movement restricting portion 38B is constituted by a rib protruding from the inner surface of the hood portion 31, and extends continuously along the circumferential direction. When the cap 70 is fixed to the hood sleeve 30, the axial movement restricting portion 38B forms a positioning groove 31M between the cap abutting portion 38A and the cap abutting portion 38A. The positioning groove 31M receives a ring body 51 of a hose clamp 50, which will be described later, and positions the hose clamp 50 in the axial direction of the hood sleeve 30.

The hose clamp 50 has a resilient tightening force and surrounds the nozzle portion 12 of the nozzle sleeve 11 from the outside, as shown in FIG. As shown in FIG. 3A, the hose clamp 50 is formed by rolling a band-shaped sheet metal into an annular shape, and includes a ring body 51 having a cut 52 at one location in the circumferential direction, and one end of the band-shaped sheet metal. A pair of knobs 53 are received in a notch 51K formed at the other end.

The pair of knobs 53 are normally urged away from each other by the elastic force of the ring body 51, as shown in FIG. 3(B). Then, as shown in FIG. 3C, when the pair of knobs 53 are pinched against the elastic force of the ring body 51, the diameter of the ring body 51 is expanded. When the pinching between the pair of knobs 53 is released, the diameter of the ring body 51 is reduced and the pair of knobs 53 are separated from each other. Note that, hereinafter, the state of the hose clamp 50 shown in FIG. 3(B) will be referred to as a diameter-reducing deformed state, and the state of the hose clamp 50 shown in FIG. 3(C) will be referred to as a diameter-expanding deformed state.

As shown in FIG. 7, the hose clamp 50 is accommodated in the hood portion 31 with the pair of knob portions 53 held in a diameter-expanding deformed state by the clips 60. The clip 60 is arranged on the base end side of the nozzle portion 12 of the nozzle sleeve 11 with respect to the hose clamp 50 (see FIG. 2). As shown in FIG. 4, the clip 60 includes a support base 61, a pair of clamping pieces 62 that protrude from the support base 61 toward the distal end side of the nozzle portion 12 of the nozzle sleeve 11, and a pair of clamping pieces 62 that extend from the support base 61 toward the center of the nozzle portion 12. It has a pressed piece 63 that protrudes toward the shaft side. Note that the clip 60 is a processed product of sheet metal, and the support base 61 is formed into a plate shape with the same thickness as the pair of clamping pieces 62 and the pressed piece 63.

The pair of clamping pieces 62 clamp the pair of knobs 53 of the hose clamp 50, as shown in FIG. 5(B). Further, the pressed piece 63 has an end portion remote from the support base 61 cut out in an arc shape along the outer peripheral surface of the nozzle portion 12 (see FIG. 4), and is shown in FIG. 5(A). Thus, the insertion end of the inserted hose 90 comes into contact with it. When the hose 90 is further pushed in, the clip 60 is pushed by the hose 90 and rotates around the support base 61, as shown in FIG. is released. As a result, the pair of knob portions 53 of the hose clamp 50 move away from each other due to the elastic force of the ring body 51, and the hose clamp 50 is deformed to reduce its diameter and tighten the hose 90.

Next, detailed configurations of the first connecting cylinder part 21 of the base sleeve 20, the second connecting cylinder part 13 of the nozzle sleeve 11, and the third connecting cylinder part 32 of the hood sleeve 30 will be described based on FIG. 8.

The first connecting cylinder portion 21 of the base sleeve 20 is provided with a first base-side stepped surface 22 that reduces the diameter of the distal end in a stepped manner at a position near the distal end thereof, and has a smaller diameter on the distal side than the first base-side stepped surface 22. It has an outer diameter portion 23 and a large outer diameter portion 27 on the proximal end side. A first annular protrusion 28 and a second annular protrusion 29 are formed in the large outer diameter portion 27 in this order from the tip side. Note that the first annular protrusion 28 and the second annular protrusion 29 each have tapered surfaces 28T and 29T whose diameter gradually decreases toward the distal end side.

Further, on the outer surface of the first connecting cylinder portion 21, nozzle engagement is provided between the first annular protrusion 28 and the second annular protrusion 29 and between the second annular protrusion 29 and the flange portion 20. A matching groove 28M and a cover engaging groove 29M are formed. Both of the nozzle engagement groove 28M and the cover engagement groove 29M have a tapered shape in which the inner surface of the groove on the side away from the tip of the first connecting cylinder 21 gradually decreases in diameter toward the tip. I am doing it.

On the outer surface of the small outer diameter portion 23, a first base side peripheral surface 25 is formed at a position adjacent to the first base side stepped surface 22 in the axial direction. The first base side circumferential surface 25 is a circumferential surface parallel to the axial direction.

A base-side tapered surface 24 is formed on the distal end side of the first base-side circumferential surface 25. The base-side tapered surface 24 decreases in diameter toward the distal end. Further, between the first base side circumferential surface 25 and the base side tapered surface 24, there is a base side fitting support part 26 that protrudes from the first base side circumferential surface 25 and extends in the circumferential direction of the first connecting cylinder part 21. It is formed. The base-side fitting support portion 26 has an inclined surface that gradually reduces in diameter on the distal end side, and is continuous with the base-side tapered surface 24 . In the hose joint of the first embodiment, the base side fitting support portion 26 has a trapezoidal cross section, but may have an arcuate or triangular cross section.

The second connecting cylinder portion 13 of the nozzle sleeve 11 has an annular protrusion 14 formed on the inner surface of its base end. The annular protrusion 14 includes a tapered surface 14T whose diameter increases toward the proximal opening.

An annular engagement groove 15 is formed on the inner surface of the second connecting cylinder portion 13 at a position adjacent to the annular protrusion 14 in the axial direction. The annular engagement groove 15 has a tapered shape in which the inner surface of the groove on the side away from the proximal opening of the second connecting cylinder portion 13 gradually decreases in diameter as it goes toward the distal end side.

Further, on the inner surface of the second connecting cylinder portion 13, a first nozzle-side stepped surface 16 is formed on the distal end side of the annular engagement groove 15, the first nozzle side step surface 16 having a stepped diameter reduction on the distal end side. An O-ring accommodation space 80K for accommodating the O-ring 80 is formed between the first nozzle-side step surface 16 and the first base-side step surface 22 of the base sleeve 20. Between the first nozzle side step surface 16 and the annular engagement groove 15 is a first nozzle side circumferential surface 17 parallel to the axial direction. The space between the first nozzle-side circumferential surface 17 and the first base-side circumferential surface 25 of the base sleeve 20 is sealed by an O-ring 80 disposed in the O-ring accommodation space 80K.

A nozzle-side tapered surface 18 is formed on the tip side of the first nozzle-side stepped surface 16, the diameter of which decreases toward the tip. The slope of the nozzle-side tapered surface 18 is gentler than the slope of the base-side tapered surface 24. Further, between the first nozzle-side step surface 16 and the nozzle-side tapered surface 18 is a nozzle-side fitting support portion 19 formed of a circumferential surface parallel to the axial direction. Furthermore, on the outer surface of the second connecting cylinder portion 13, a second nozzle side step surface 13D is provided at a position facing the first nozzle side step surface 16 in the radial direction, the diameter of which increases in a stepped manner on the base end side. ing.

The third connecting cylinder portion 32 of the hood sleeve 30 has an annular protrusion 33 formed on the inner surface of the base end. The annular protrusion 33 includes a tapered surface 33T whose diameter increases toward the proximal opening. Further, an engagement step surface 33D is formed on the inner surface of the third connecting cylinder portion 32, and the diameter of the distal end side of the annular protrusion 33 is increased in a stepped manner.

Further, on the inner surface of the third connecting cylinder part 32, a hood side step part 32D is formed which faces the engagement step surface 33D from the distal end side of the third connecting cylinder part 32 and expands in diameter in a stepped shape on the proximal end side. has been done.

The explanation regarding the configuration of the first embodiment is above. Next, the manufacturing method and connection structure of the hose joint 10 will be explained. In the hose joint 10, the hood sleeve 30 is first attached to the nozzle sleeve 11. As shown in FIG. 9A, the tip of the nozzle part 12 of the nozzle sleeve 11 is inserted from the base end side of the third connecting cylinder part 32 of the hood sleeve 30, and the second connecting cylinder part 12 of the nozzle sleeve 11 is The second nozzle-side stepped surface 13D of the third connecting cylinder 32 is engaged with the hood-side stepped portion 32D of the third connecting cylinder portion 32. Then, as shown in FIG. 9(B), the proximal end of the hood sleeve 30 is in a state of protruding more proximally than the proximal end of the second connecting cylinder part 13.

In the first embodiment, after the hood sleeve 30 is attached to the nozzle sleeve 11, the hose clamp 50 to which the clip 60 is attached is housed in the hood sleeve 30, and the opening at the tip of the hood sleeve 30 is closed with the cap 70. I'll keep it.

Next, the first connecting cylinder part 21 of the base sleeve 20 is fitted into the second connecting cylinder part 13 of the nozzle sleeve 11. First, as shown in FIG. 9(B), the O-ring 80 is attached in advance to the first base side circumferential surface 25 of the first connecting cylinder part 21, and then the tip of the first connecting cylinder part 21 is connected to the second connecting cylinder part 21. Insert from the base end side of the cylindrical portion 13. The O-ring 80 slides against the tapered surface 14T of the annular protrusion 14 in the proximal opening of the second connecting cylinder 13, is crushed once, and then elastically returns to engage with the annular engagement groove 15 (see FIG. 10). See A).

Then, the first connecting cylinder portion 21 is further pushed toward the distal end side, and the hose joint 10 is completed. Specifically, the first connecting cylindrical portion 21 is pushed into the second connecting cylindrical portion 13 to a position where the first annular protrusion 28 engages with the annular engagement groove 15 . Then, the O-ring 80 is pushed out from the annular engagement groove 15, placed in the O-ring housing space 80K, and crushed between the first base-side circumferential surface 25 and the first nozzle-side circumferential surface 17 (see FIG. 10). See B). This seals between the first base side circumferential surface 25 and the first nozzle side circumferential surface 17.

At this time, the tapered surface 14T of the annular protrusion 14 of the second connecting cylinder part 13 comes into sliding contact with the tapered surface 28T of the first annular protrusion 28 of the first connecting cylinder part 21, and the first annular protrusion deforms while expanding in diameter. The first annular protrusion 28 rides over the strip 28 and engages with the annular engagement groove 15 in a convex-concave manner. At this time, the base end surface of the second connecting cylinder part 13 is abutted against the surface facing the distal end side of the second annular protrusion 29 of the first connecting cylinder part 21 . Note that the tapered surface 28T of the first annular protrusion 28 overlaps the tapered inner surface of the annular engagement groove 15.

Here, the uneven engagement between the first annular protrusion 28 and the annular engagement groove 15 is such that the annular protrusion 14 rides over the first annular protrusion 28 and engages with the first annular protrusion 28 . A predetermined clearance is secured between the mating groove 15 and the mating groove 15. Note that the engagement between the annular engagement groove 15 and the first annular protrusion 28 corresponds to "the uneven engagement portion between the first connecting cylinder part and the second connecting cylinder part" in the claims.

Further, when the first connecting cylinder part 21 is pushed into the second connecting cylinder part 13 until the first annular protrusion 28 engages with the annular engagement groove 15, the annular protrusion of the third connecting cylinder part 32 of the hood sleeve 30 The tapered surface 33T of the portion 33 comes into sliding contact with the tapered surface 29T of the second annular protrusion 29 of the first connecting cylinder portion 21, and rides over the second annular protrusion 29 while deforming to expand the diameter, and connects the second annular protrusion 29 with the second annular protrusion 29. The engagement step surface 33D of the 3-connection cylinder portion 32 engages with the engagement step surface 33D. At this time, the proximal end surface of the third connecting cylinder part 32 abuts against the surface facing the distal end of the flange part 20F of the base sleeve 20, and the annular protrusion 33 of the third connecting cylinder part 32 It engages with the cover engagement groove 29M. Thereby, the first connecting cylinder part 21 and the third connecting cylinder part 13 fit together. Note that the engagement between the second annular protrusion 29 and the engagement step surface 33D corresponds to "the uneven engagement portion between the first connecting cylinder part and the third connecting cylinder part" in the claims.

At this time, the inner surface of the third connecting cylinder part 32 is located between the engagement step surface 33D and the hood side step part 32D, and the proximal part of the second connecting cylinder part 13 that is closer to the sleeve side step part 13D. 1 and a part of the large outer diameter section 27 of the connecting cylinder section 21. This stabilizes the fit between the first connecting cylinder part 21 and the second connecting cylinder part 13.

Moreover, when the first connecting cylinder part 21 is pushed into the second connecting cylinder part 13 until the first annular protrusion 28 engages with the annular engagement groove 15, the base side tapered surface 24 of the first connecting cylinder part 21 , is inserted into the distal end side along the nozzle side fitting support part 19 of the second connecting cylinder part 13, and is arranged to face the nozzle side tapered surface 18 of the second connecting cylinder part 13. As described above, since the base-side tapered surface 24 and the nozzle-side tapered surface 18 have different slopes, the base-side tapered surface 24 and the nozzle-side tapered surface 18 are configured to approach each other toward the proximal end. It has become. Note that the base-side tapered surface 24 and the nozzle-side tapered surface 18 correspond to a "tapered fitting portion" in the claims.

At this time, the base side fitting support part 26 of the first connection cylinder part 21 is inserted toward the distal end side of the first nozzle side step surface 16 of the second connection cylinder part 13 and is opposed to the nozzle side fitting support part 19. do. Although not clearly shown in the drawings, the maximum outer diameter of the base side fitting support part 26 is slightly smaller than the inner diameter of the nozzle side fitting support part 19, and the base side fitting support part 26 is slightly smaller than the inner diameter of the nozzle side fitting support part 19. has a gap between it and the nozzle side fitting support part 19 so that they do not come into contact with each other. Note that the base side fitting support section 26 and the nozzle side fitting support section 19 correspond to the "fitting support section" in the claims.

Next, the effects of the first embodiment will be explained. In the hose joint 10 of the first embodiment, the first connection cylinder part 21 of the base sleeve 20 is inserted into the second connection cylinder part 13 of the nozzle sleeve 11, and the first connection cylinder part 21 and the second connection cylinder part The O-ring 80 is accommodated in the O-ring accommodation space 80K formed between the first base side circumferential surface 25 and the first nozzle side circumferential surface 17, and the O-ring accommodation space 80K is sealed between the first base side circumferential surface 25 and the first nozzle side circumferential surface 17. The annular engagement groove 15 and the first annular protrusion 28 engage in a convex-concave manner on the base end side, and the nozzle-side fitting support part 19 faces the base-side fitting support part 26 on the distal end side of the O-ring accommodation space 80K. Placed.

Here, a description will be given of the hose joint 10S which is not provided with a fitting portion between the base side fitting support part 26 and the nozzle side fitting support part 19. As described above, the uneven engagement between the first annular protrusion 28 and the annular engagement groove 15 is achieved because a predetermined clearance is secured between the first annular protrusion 28 and the annular engagement groove 15. , the first annular protrusion 28 is movable within the annular engagement groove 15. That is, the second connecting cylinder part 13 is movable in the axial direction and the radial direction with respect to the first connecting cylinder part 21. In the case of such a hose joint 10S, if the hose 90 is excessively bent after being tightened with the hose clamp 50, the second connecting cylinder part 13 will wobble with respect to the first connecting cylinder part 21, resulting in As shown in FIG. 2, the second connecting cylinder part 13 may be inclined with respect to the first connecting cylinder part 21, and the uneven engagement between the first annular protrusion 28 and the annular engagement groove 15 may become loose.

In contrast, the hose joint 10 of the first embodiment includes a fitting portion between the base side fitting support portion 26 and the nozzle side fitting support portion 19. In this fitting portion, a base side fitting support portion 26 protruding from the first base side circumferential surface 25 faces the nozzle side fitting support portion 19 having a circumferential surface parallel to the axial direction. Therefore, when a load is applied to the nozzle part 12 or the hood part 31 and the second connecting cylinder part 13 shakes with respect to the first connecting cylinder part 21, the base side fitting support part 26 is fitted to the nozzle side. It is fixed in contact with the circumferential surface of the mating support part 19, and movement of the second connecting cylinder part 13 in the axial direction or the radial direction with respect to the first connecting cylinder part 21 is restricted. Thereby, loosening of the uneven engagement between the first annular protrusion 28 and the annular engagement groove 15 can be suppressed.

Furthermore, in the hose joint 10 of the present disclosure, since the distal end portion of the first connecting cylindrical portion 21 is the base-side tapered surface 24, the distal end of the first connecting cylindrical portion 21 is connected to the base end opening of the second connecting cylindrical portion 13. When inserted, the base side tapered surface 24 becomes a guide surface, and the circumferential surface of the nozzle side fitting support section 19 can be inserted all the way to the guide surface, so that the first connection cylinder section 21 and the first connection tube section 21 The two connecting cylinder portions 13 can be easily fitted together.

Moreover, since the surface of the base-side fitting support part 26 facing the distal end side is an inclined surface that is continuous with the base-side tapered surface 24, the base-side fitting support part 26 is guided to the base-side tapered surface 24. It can be easily inserted until it is placed facing the nozzle side fitting support part 19.

Furthermore, in the hose joint 10 of the present disclosure, the base side tapered surface 24 and the nozzle side tapered surface 18 have different slopes, and the fitting portion between the base side fitting support part 26 and the nozzle side fitting support part 19 is Since the first connecting cylinder part 21 and the second connecting cylinder part 13 are configured to approach each other more firmly as they get closer to each other, when a load is applied to the nozzle part 12 or the hood part 31, the first connecting cylinder part 21 and the second connecting cylinder part 13 are fixed more firmly.

Furthermore, when connecting the first connecting cylinder part 21 to the second connecting cylinder part 13, the O-ring 80 is attached to the first base side circumferential surface 25 in advance, and the O-ring 80 is inserted from the proximal opening of the second connecting cylinder part 13. However, by providing the base-side fitting support portion 26, the O-ring 80 is prevented from coming off, and the O-ring 80 can be easily placed in the O-ring accommodation space 80K. Moreover, by using the base-side tapered surface 24 of the first connecting cylinder part 21, the O-ring 80 can be easily attached from the tip of the first connecting cylinder part 21.

Furthermore, in the hose joint 10 of the present disclosure, the third connecting cylinder part 32 of the hood sleeve 30 engages with the first connecting cylinder part 21 in an uneven manner, and the inner surface of the third connecting cylinder part 32 engages with the second connecting cylinder part 32. 13 and the base end portion of the first connecting cylinder portion 21 are sandwiched between them. As a result, the third connecting cylinder part 32 is stacked on the outside of the first connecting cylinder part 21, and the base end part of the second connecting cylinder part 13 is connected to the first connecting cylinder part 21 (in detail, the nozzle engaging groove 28M ), and the fitting between the first connecting cylinder part 21 and the second connecting cylinder part 13 can be stabilized.

[Second embodiment]
Next, a hose joint 10U according to a second embodiment to which the present disclosure is applied will be described. In the following description, only the differences from the first embodiment will be described, and redundant description of common configurations will be omitted.

In the hose joint 10 of the first embodiment, the maximum outer diameter of the base side fitting support part 26 is slightly smaller than the inner diameter of the nozzle side fitting support part 19, and the base side fitting support part 26 and There is a gap between the base side fitting support part 26 and the nozzle side fitting support part 19, so that when a load is applied to the nozzle part 12 or the hood part 31, the base side fitting support part 26 closes around the nozzle side fitting support part 19. However, in the hose joint 10U of the second embodiment, the base side fitting support portion 26U comes into contact with the nozzle side fitting support portion 19 (not shown). Thereby, the base side fitting support part 26U is always fixed to the circumferential surface of the nozzle side fitting support part 19, and displacement in the axial direction or the radial direction can be reliably prevented.

In this configuration, the maximum outer diameter of the base side fitting support part 26U is approximately the same as or larger than the inner diameter of the nozzle side fitting support part 19, but the surface facing the tip side of the base side fitting support part 26U is Since the slope is continuous with the base-side tapered surface 24, the base-side fitting support portion 26 is guided by the base-side tapered surface 24 and easily reaches the nozzle-side fitting support portion 19. Can be press-fitted.

[Third embodiment]
A hose joint 10V of the third embodiment is shown in FIG. 12(A). The nozzle side fitting support portion 19V of the hose joint 10V of the third embodiment is formed with an annular protrusion 40 that protrudes from the circumferential surface parallel to the axial direction and extends in the circumferential direction of the second connection cylinder portion 13. . The protrusion 40 contacts the base side fitting support portion 26V from the proximal end side. This restricts the movement of the second connecting cylinder part 13V in the axial direction with respect to the first connecting cylinder part 21V, making it possible to more stably fit the first connecting cylinder part 21V and the second connecting cylinder part 13V.

In addition, in the third embodiment, the base side fitting support part 26V is provided so as not to be continuous with the base side tapered surface 24 (see FIG. 12(A)), but in the same way as in the above first embodiment. , the base-side fitting support portion 26V may have an inclined surface continuous with the base-side tapered surface 24 on the distal end side.

Further, although the protrusion 40 protruding from the base side fitting support part 26V has an annular shape along the circumferential direction, it does not have to have a shape closed in the circumferential direction, and may be provided in plural numbers to circumferentially circumferentially. The structure may be such that they are lined up in the direction.

[Fourth embodiment]
A hose joint 10Y of the fourth embodiment is shown in FIG. 13. In the fourth embodiment, both the nozzle side fitting support part 19Y and the base side fitting support part 26Y have circumferential surfaces parallel to the axial direction, and the nozzle side fitting support part 19Y and the base side fitting support part 19Y have circumferential surfaces parallel to the axial direction. The axial length of the portion where the support portion 26Y fits is longer than the axial lengths of the first base side circumferential surface 25 and the first nozzle side circumferential surface 17. With this configuration, even if the base end of the second connecting cylinder part 13 tries to move away from the first connecting cylinder part 21 (specifically, the nozzle engagement groove 28M), the nozzle side fitting The movement of the proximal end portion of the second connecting tube portion 21 is restricted by the fitting portion of the support portion 19Y and the base side fitting support portion 26Y, and the second connecting tube portion 13 is tilted with respect to the first connecting tube portion 21. can be suppressed.

[Other embodiments]
(1) In the first embodiment, the nozzle side fitting support part 19 has a circumferential surface parallel to the axial direction, and the base side fitting support part 26 protrudes from the first base side circumferential surface 25 and the first Although the shape extends in the circumferential direction of the connecting cylinder portion 21, the base side fitting support portion 26 has a circumferential surface parallel to the axial direction, and the nozzle side fitting support portion 19 has a circumferential surface parallel to the first nozzle side circumferential surface 17. It may have a shape that protrudes from and extends in the circumferential direction of the second connecting cylinder portion 13.

(2) In the hose joint 10V of the third embodiment, one annular protrusion 40 is formed in the nozzle side fitting support portion 19V along the circumferential direction. As in the shown hose joint 10W, two protrusions 41 may be formed on the nozzle side fitting support part 19W, and the two protrusions 41 may be in contact with the base side fitting support part 26W from the proximal end side or the distal end side. .

(3) In the hose joint 10V of the third embodiment, the protrusion 40 of the nozzle side fitting support part 19V and the base side fitting support part 26V engage with each other. Like the shown hose joint 10X, a configuration may be adopted in which a groove portion 42 is formed along the circumferential direction in the nozzle side fitting support portion 19X, and the groove portion 42 and the base side fitting support portion 26X engage with each other. At this time, the groove portion 42 formed in the nozzle side fitting support portion 19X and the base side fitting support portion 26X may have a gap therebetween, or may be in contact with each other. Further, the groove portion 42 and the base side fitting support portion 26X may have substantially the same shape as shown in FIG. The shape of the side fitting support portion 26X may be different, such as a semicircular shape.

(4) In the first embodiment described above, the engagement between the first annular protrusion 28 of the first connecting cylinder part 21 and the annular engagement groove 15 of the second connecting cylinder part 13 Although the two annular protrusions 29 are engaged with the engagement step surface 33D of the hood sleeve 30 at the same time, the timing of engagement may be shifted. In this way, the load applied to the second connecting cylinder part 13, the first connecting cylinder part 21, and the third connecting cylinder part 32 can be reduced.

10 Hose joint 11 Nozzle sleeve 12 Nozzle part 13 Second connection cylinder part 15 Annular engagement groove (uneven engagement part)
16 First nozzle side stepped surface 17 First nozzle side circumferential surface 18 Nozzle side tapered surface (tapered fitting part)
19 Nozzle side fitting support part (fitting support part)
20 Base sleeve 21 First connecting cylinder portion 22 First base side stepped surface 24 Base side tapered surface (tapered fitting portion)
25 First base side peripheral surface 26 Base side fitting support part (fitting support part)
28 First annular protrusion (uneven engagement part)
80 O-ring 90 Hose

Claims (8)

a base sleeve having an equipment connection cylinder part connected to a pipe, tank or other equipment connection part at the proximal end of the first connection cylinder part tapered in a stepped manner;
a nozzle sleeve having a nozzle portion to which a hose is connected at the tip of the second connecting cylinder portion whose inside diameter is expanded in a stepped manner;
The second connecting cylinder part is fitted on the outside of the first connecting cylinder part,
An O-ring is disposed between a first base-side step surface and a first nozzle-side step surface of the first connection cylinder part and the second connection cylinder part, which face each other, and sealing between a first base side circumferential surface extending from the first base side step surface to the distal end side and a first nozzle side circumferential surface of the second connecting cylinder portion extending from the first nozzle side step surface to the proximal end side; death,
Of the first connecting cylinder part and the second connecting cylinder part, on the proximal end side of the step surface on the first base side, the first connecting cylinder part overcomes the diameter expansion deformation of the second connecting cylinder part and connects to each other. In a sleeve connection structure provided with a concave-convex engaging portion that engages,
Among the first connecting cylinder part and the second connecting cylinder part, on the distal end side from the step surface on the first nozzle side, there is a tapered fitting part whose diameter decreases toward the distal end and which fit into each other, and the tapered fitting part. a fitting support part located on the proximal side of the fitting part and having at least one peripheral surface parallel to the axial direction ,
The fitting support portion of the first connecting tube portion protrudes from the first base side circumferential surface, has an arcuate, trapezoidal, or triangular cross section, and extends in the circumferential direction of the first connecting tube portion. ,
The fitting support part of the second connecting cylinder part has a protrusion or a recess that engages with the fitting support part of the first connecting cylinder part and restricts movement in the axial direction. connection structure. a base sleeve having an equipment connection cylinder part connected to a pipe, tank or other equipment connection part at the proximal end of the first connection cylinder part tapered in a stepped manner;
a nozzle sleeve having a nozzle portion to which a hose is connected at the tip of the second connecting cylinder portion whose inside diameter is expanded in a stepped manner;
The second connecting cylinder part is fitted on the outside of the first connecting cylinder part,
An O-ring is disposed between a first base-side step surface and a first nozzle-side step surface of the first connection cylinder part and the second connection cylinder part, which face each other, and sealing between a first base side circumferential surface extending from the first base side step surface to the distal end side and a first nozzle side circumferential surface of the second connecting cylinder portion extending from the first nozzle side step surface to the proximal end side; death,
Of the first connecting cylinder part and the second connecting cylinder part, on the proximal end side of the step surface on the first base side, the first connecting cylinder part overcomes the diameter expansion deformation of the second connecting cylinder part and connects to each other. In a sleeve connection structure provided with a concave-convex engaging portion that engages,
Among the first connecting cylinder part and the second connecting cylinder part, on the distal end side from the step surface on the first nozzle side, there is a tapered fitting part whose diameter decreases toward the distal end and which fit into each other, and the tapered fitting part. a fitting support part located on the proximal side of the fitting part and having at least one peripheral surface parallel to the axial direction,
The sleeve connection structure wherein the axial length of the fitting support portion is equal to or longer than the distance between the first base-side step surface and the first nozzle-side step surface . a base sleeve having an equipment connection cylinder part connected to a pipe, tank or other equipment connection part at the proximal end of the first connection cylinder part tapered in a stepped manner;
a nozzle sleeve having a nozzle portion to which a hose is connected at the tip of the second connecting cylinder portion whose inside diameter is expanded in a stepped manner;
The second connecting cylinder part is fitted on the outside of the first connecting cylinder part,
An O-ring is disposed between a first base-side step surface and a first nozzle-side step surface of the first connection cylinder part and the second connection cylinder part, which face each other, and sealing between a first base side circumferential surface extending from the first base side step surface to the distal end side and a first nozzle side circumferential surface of the second connecting cylinder portion extending from the first nozzle side step surface to the proximal end side; death,
Of the first connecting cylinder part and the second connecting cylinder part, on the proximal end side of the step surface on the first base side, the first connecting cylinder part overcomes the diameter expansion deformation of the second connecting cylinder part and connects to each other. In a sleeve connection structure provided with a concave-convex engaging portion that engages,
Among the first connecting cylinder part and the second connecting cylinder part, on the distal end side from the step surface on the first nozzle side, there is a tapered fitting part whose diameter decreases toward the distal end and which fit into each other, and the tapered fitting part. a fitting support part located on the proximal side of the fitting part and having at least one peripheral surface parallel to the axial direction,
The tapered surface of the tapered fitting part of the first connecting cylindrical part and the tapered surface of the tapered fitting part of the second connecting cylindrical part have mutually different slopes so that they approach the fitting support part. Sleeve connection structure with . a base sleeve having an equipment connection cylinder part connected to a pipe, tank or other equipment connection part at the proximal end of the first connection cylinder part tapered in a stepped manner;
a nozzle sleeve having a nozzle part to which a hose is connected to the tip of a second connecting cylinder part whose inner side expands in diameter in a stepwise manner and into which the first connecting cylinder part is fitted; In structure,
Of the first connecting cylinder part and the second connecting cylinder part, the first connecting cylinder part is located on the proximal end side of the first base side step surface which is the step surface of the first connecting cylinder part. A first engaging portion is provided that engages with each other while overcoming the diameter expansion deformation of the cylindrical portion,
A first base side circumferential surface extending from the first base side step surface to the distal end side of the first connecting cylinder part, and the second connection fitted with a space left outside of the first base side circumferential surface. An O-ring is sandwiched between the cylindrical part and the first nozzle-side circumferential surface to seal them.
Of the first connecting cylinder part and the second connecting cylinder part, a second connecting cylinder part is disposed on the distal end side of the O-ring, and the first connecting cylinder part engages with each other by overcoming the diameter expansion deformation of the second connecting cylinder part. A sleeve connection structure provided with an engaging part . a base sleeve having an equipment connection cylinder part connected to a pipe, tank or other equipment connection part at the proximal end of the first connection cylinder part tapered in a stepped manner;
a nozzle sleeve having a nozzle part to which a hose is connected to the tip of a second connecting cylinder part whose inner side expands in diameter in a stepwise manner and into which the first connecting cylinder part is fitted; In structure,
Of the first connecting cylinder part and the second connecting cylinder part, the first connecting cylinder part is located on the proximal end side of the first base side step surface which is the step surface of the first connecting cylinder part. A first engaging portion is provided that engages with each other while overcoming the diameter expansion deformation of the cylindrical portion,
A first base side circumferential surface extending from the first base side step surface to the distal end side of the first connecting cylinder part, and the second connection fitted with a space left outside of the first base side circumferential surface. An O-ring is sandwiched between the cylindrical part and the first nozzle-side circumferential surface to seal them.
Of the first connecting cylinder part and the second connecting cylinder part, a second connecting cylinder part is disposed on the distal end side of the O-ring, and the first connecting cylinder part engages with each other by overcoming the diameter expansion deformation of the second connecting cylinder part. An engaging part is provided,
The second engaging part of the first connecting cylinder part protrudes from the outer peripheral surface of the first connecting cylinder part, has an arcuate cross section, and extends in the circumferential direction, and the second engaging part of the second connecting cylinder part extends in the circumferential direction. The joint portion is a sleeve connection structure that protrudes from the inner circumferential surface of the second connection cylinder portion, has an arcuate cross section, and extends in the circumferential direction . a base sleeve having an equipment connection cylinder part connected to a pipe, tank or other equipment connection part at the proximal end of the first connection cylinder part tapered in a stepped manner;
a nozzle sleeve having a nozzle part to which a hose is connected to the tip of a second connecting cylinder part whose inner side expands in diameter in a stepwise manner and into which the first connecting cylinder part is fitted; In structure,
Of the first connecting cylinder part and the second connecting cylinder part, the first connecting cylinder part is located on the proximal end side of the first base side step surface which is the step surface of the first connecting cylinder part. A first engaging portion is provided that engages with each other while overcoming the diameter expansion deformation of the cylindrical portion,
A first base side circumferential surface extending from the first base side step surface to the distal end side of the first connecting cylinder part, and the second connection fitted with a space left outside of the first base side circumferential surface. An O-ring is sandwiched between the cylindrical part and the first nozzle-side circumferential surface to seal them.
Of the first connecting cylinder part and the second connecting cylinder part, a second connecting cylinder part is disposed on the distal end side of the O-ring, and the first connecting cylinder part engages with each other by overcoming the diameter expansion deformation of the second connecting cylinder part. An engaging part is provided,
The second engaging part of the first connecting cylinder part protrudes from the outer peripheral surface of the first connecting cylinder part, has an arcuate cross section, and extends in the circumferential direction, and the second engaging part of the second connecting cylinder part extends in the circumferential direction. The mating portions protrude in pairs from the inner circumferential surface of the second connecting cylindrical portion, have an arcuate cross section, extend in parallel to the circumferential direction, and are connected to the second engaging portion of the first connecting cylindrical portion on the distal end side. and a sleeve connection structure that engages in a state where they can come into contact from the proximal end side . a base sleeve having an equipment connection cylinder part connected to a pipe, tank or other equipment connection part at the proximal end of the first connection cylinder part tapered in a stepped manner;
a nozzle sleeve having a nozzle part to which a hose is connected to the tip of a second connecting cylinder part whose inner side expands in diameter in a stepwise manner and into which the first connecting cylinder part is fitted; In structure,
Of the first connecting cylinder part and the second connecting cylinder part, the first connecting cylinder part is located on the proximal end side of the first base side step surface which is the step surface of the first connecting cylinder part. A first engaging portion is provided that engages with each other while overcoming the diameter expansion deformation of the cylindrical portion,
A first base side circumferential surface extending from the first base side step surface to the distal end side of the first connecting cylinder part, and the second connection fitted with a space left outside of the first base side circumferential surface. An O-ring is sandwiched between the cylindrical part and the first nozzle-side circumferential surface to seal them.
A second engaging portion is provided on the distal end side of the O-ring among the first connecting cylinder portion and the second connecting cylinder portion,
The second engaging part of the first connecting cylinder part protrudes from the outer peripheral surface of the first connecting cylinder part, has an arcuate cross section, and extends in the circumferential direction, and the second engaging part of the second connecting cylinder part extends in the circumferential direction. The joint part has a groove shape that is depressed from the inner peripheral surface of the second connecting cylinder part and extends in the circumferential direction, and is in a state where at least a tip end of the second engaging part of the first connecting cylinder part is received. Engaging sleeve connection structure. a base sleeve having an equipment connection cylinder part connected to a pipe, tank or other equipment connection part at the proximal end of the first connection cylinder part tapered in a stepped manner;
a nozzle sleeve having a nozzle portion to which a hose is connected at the tip of the second connecting cylinder portion whose inside diameter is expanded in a stepped manner;
The second connecting cylinder part is fitted on the outside of the first connecting cylinder part,
An O-ring is disposed between a first base-side step surface and a first nozzle-side step surface of the first connection cylinder part and the second connection cylinder part, which face each other, and sealing between a first base side circumferential surface extending from the first base side step surface to the distal end side and a first nozzle side circumferential surface of the second connecting cylinder portion extending from the first nozzle side step surface to the proximal end side; death,
Of the first connecting cylinder part and the second connecting cylinder part, on the proximal end side of the step surface on the first base side, the first connecting cylinder part overcomes the diameter expansion deformation of the second connecting cylinder part and connects to each other. In a sleeve connection structure provided with a concave-convex engaging portion that engages,
Among the first connecting cylinder part and the second connecting cylinder part, on the distal end side from the step surface on the first nozzle side, there is a tapered fitting part whose diameter decreases toward the distal end and which fit into each other, and the tapered fitting part. A method for manufacturing a hose joint including a sleeve connection structure including a fitting support portion located on the proximal side of the fitting portion and having at least one circumferential surface parallel to the axial direction, the method comprising :
The sleeve connection structure is
The fitting support part of the first connecting cylinder part protrudes from the first base side circumferential surface, has an arcuate, trapezoidal, or triangular cross section, and extends in the circumferential direction of the first connecting cylinder part, having a sloped surface continuous to the tapered surface of the tapered fitting part of the first connecting cylinder part on the distal end side;
With an O-ring fitted to the circumferential surface on the first base side and prevented from coming off by the fitting support part of the first connecting cylinder part, the second connecting cylinder part is attached to the outside of the first connecting cylinder part. Manufacturing method for fitting hose joints.

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