JP2021063580A - Hose joint fitting - Google Patents

Abstract

To reduce costs by simplifying manufacturing steps, and to improve come-off resistance of a cylindrical body with respect to a joint body.SOLUTION: A hose joint fitting includes a joint body having a pipe portion, a cylindrical body, and a seal member. The pipe portion has a pipe body, and a pipe diameter expanding portion that is provided at an end portion of the pipe body and has an inner diameter and an outer diameter which are larger than that of the pipe body. The cylindrical body has a pipe insertion portion inserted into the pipe body, and a hose installing portion installed with an end portion of a hose. When the diameter of the pipe body is contracted, a space between an inner peripheral surface of the pipe body and an outer peripheral surface of a small-diameter portion of the pipe insertion portion is sealed by a sealing member. In the small-diameter portion, a different diameter portion having an outer diameter different from the small-diameter portion is coupled to the pipe body so as not to move in an axial direction while the pipe insertion portion is inserted into the pipe body and the diameter of the pipe body is contracted.SELECTED DRAWING: Figure 4

Description

The present invention relates to a hose joint fitting.

Conventionally, a hose joint fitting attached to an end of a hose has been provided in order to connect the hose to a device or the like.
The hose joint fitting includes a metal nipple and a socket (see, for example, Patent Document 1).
The nipple is equipped with a tubular base that is attached to and detached from the device, a nut that is provided in a hexagonal columnar shape at the end of the base, a recess that is provided adjacent to the nut, and the end of the hose. Hose mounting portions are provided side by side in the axial direction of the nipple.
The socket is attached to the nipple by crimping one end thereof in the longitudinal direction into the groove of the nipple, and the socket is arranged radially outside the hose attachment portion of the nipple.
The hose joint fitting has an annular space at one end in the axial direction in which the end of the hose is inserted between the outer peripheral surface of the hose mounting portion and the inner peripheral surface of the socket.
To attach the hose fitting to the end of the hose, insert the end of the hose into the annular space and then crimp the socket to integrally attach the socket, the end of the hose, and the hose mounting part. Be done.

Japanese Unexamined Patent Publication No. 2014-181789

However, the hose joint fitting as described above requires a step of forming a concave groove for attaching the socket to the nipple and a step of attaching the socket to the nipple via the concave groove, which complicates the manufacturing process. ..
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hose joint fitting that is advantageous in simplifying a manufacturing process and reducing costs.

In order to achieve the above-mentioned object, the present invention includes a metal joint body having a pipe portion at one end in the axial direction and a metal tubular body, and the pipe portion is inside the radius thereof. The tubular body has a pipe body that can be reduced in diameter and a pipe diameter-expanded portion that is provided at the end of the pipe body and has a larger inner diameter and outer diameter than the pipe body and can be reduced in diameter inside the radius. , A pipe insertion portion provided in one portion in the longitudinal direction and inserted into the pipe body, and a hose provided in the other portion in the longitudinal direction and inserted into the pipe diameter expansion portion to which an end portion of the hose is attached. The pipe insertion portion has a mounting portion, and the pipe insertion portion has a small diameter portion that can be inserted into the pipe body, and has the small diameter portion in the pipe body on either the inner peripheral surface of the pipe body or the outer peripheral surface of the small diameter portion. In a state where the portion is inserted and the diameter of the pipe body is reduced, a sealing member for sealing between the inner peripheral surface and the outer peripheral surface is attached, and the small diameter portion has a different outer diameter from the small diameter portion and the pipe. It is characterized in that, in a state where the pipe insertion portion is inserted into the main body and the diameter of the pipe main body is reduced, the pipe main body is provided with a different diameter portion that is immovably coupled in the axial direction thereof.
Further, the present invention includes a metal joint body having a pipe portion at one end in the axial direction and a metal tubular body, and the pipe portion is a pipe whose diameter can be reduced inside the radius thereof. The tubular body has a main body and a pipe diameter-expanded portion provided at an end of the pipe main body, which has a larger inner diameter and outer diameter than the pipe main body and can be reduced in diameter inside the radius, and the tubular body is in the longitudinal direction thereof. It has a pipe insertion portion provided in one portion and inserted into the pipe body, and a hose attachment portion provided in the other portion in the longitudinal direction thereof and inserted into the pipe diameter expansion portion to which the end portion of the hose is attached. The pipe insertion portion has a small diameter portion that can be inserted into the pipe body, and the inner peripheral surface of the pipe body and the outer peripheral surface of the small diameter portion have the small diameter portion inserted into the pipe body. Is formed as a metal seal forming surface for pressing and sealing the inner peripheral surface and the outer peripheral surface in a reduced diameter state, and the small diameter portion has a different outer diameter from the small diameter portion, and the pipe body has the said. It is characterized in that, in a state where the pipe insertion portion is inserted and the diameter of the pipe body is reduced, the pipe body is provided with a different diameter portion that is immovably coupled in the axial direction thereof.
Further, the present invention includes a metal joint body having a pipe portion at one end in the axial direction and a metal tubular body, and the pipe portion is the pipe body and the ends of the pipe body. A portion of the pipe body that has an inner diameter and an outer diameter larger than that of the pipe body and is capable of reducing the diameter inside the pipe body is provided, and a portion of the pipe body that is separated from the pipe diameter-expanded portion is the first outer portion. The portion formed as a diameter portion and between the first outer diameter portion and the pipe enlarged diameter portion has a larger inner diameter than the first outer diameter portion and a smaller inner diameter than the pipe enlarged diameter portion, and its radius. The tubular body is formed as a second outer diameter portion capable of reducing the diameter inward in the direction, and the tubular body is provided at one portion in the longitudinal direction thereof and is inserted into the pipe body, and the other portion in the longitudinal direction thereof. The pipe insertion portion has a hose attachment portion provided in the portion, which is inserted into the pipe enlarged diameter portion and to which the end portion of the hose is attached, and the pipe insertion portion has a small diameter portion that can be inserted into the pipe body. A seal that seals between the inner peripheral surface and the outer peripheral surface of the outer diameter portion with the small diameter portion inserted into the first outer diameter portion on one of the inner peripheral surface of the outer diameter portion or the outer peripheral surface of the small diameter portion. A member is attached, and the outer diameter of the small diameter portion is different from that of the small diameter portion, the pipe insertion portion is inserted into the pipe body, and the second outer diameter portion is reduced in diameter. It is characterized in that a different diameter portion that is immovably connected in the axial direction is provided.
Further, the present invention includes a metal joint body having a pipe portion at one end in the axial direction and a metal tubular body, and the pipe portion is the pipe body and the ends of the pipe body. The pipe has an inner diameter and an outer diameter larger than those of the pipe body and has a pipe diameter-expanded portion that can be reduced in diameter inside the radius, and the tubular body is provided in one portion in the longitudinal direction of the pipe. The pipe insertion portion has a pipe insertion portion to be inserted into the main body and a hose attachment portion provided in the other portion in the longitudinal direction thereof and inserted into the pipe diameter expansion portion to which the end portion of the hose is attached. The pipe body has a small diameter portion that can be inserted into the pipe body and a different diameter portion that has a different outer diameter from the small diameter portion. With the small diameter portion inserted, a sealing member that seals between the inner peripheral surface and the outer peripheral surface is attached, and the different diameter portion is immovably fitted into the pipe body in the axial direction of the pipe body. It is characterized in that a fitting portion to be fitted is provided.
Further, the present invention is characterized in that the different diameter portion is formed of a large diameter portion having an outer diameter smaller than the inner diameter of the pipe enlarged diameter portion and larger than the outer diameter of the small diameter portion.

In the present invention, the pipe insertion portion is inserted into the pipe body and the diameter of the pipe body is reduced, so that the inner peripheral surface of the pipe body and the outer peripheral surface of the small diameter portion are sealed by the sealing member, and the different diameter portion is formed. It is immovably connected to the pipe body in the direction of its axis.
Further, by reducing the diameter of the pipe diameter-expanded portion, the hose mounting portion, the hose end portion, and the pipe diameter-expanded portion are integrated, and the hose joint fitting and the hose end portion are connected.
The pipe portion constituting the hose joint fitting of the present invention can be easily manufactured by expanding the pipe material, and the tubular body constituting the hose joint fitting has a simple structure, so that it can be easily manufactured from the pipe material. it can.
Therefore, according to the present invention, the hose joint fitting can be manufactured by omitting the step of forming a concave groove for attaching the socket to the nipple and the step of attaching the socket to the nipple via the concave groove as in the conventional case, and the manufacturing process can be performed. It is advantageous in simplifying and reducing costs.
Further, according to the present invention, the diameter of the pipe enlarged portion is reduced so that not only the pipe enlarged portion, the hose mounting portion and the end portion of the hose are integrated, but also the diameter of the pipe body is reduced. Since the different diameter portion is immovably coupled to the pipe body in the axial direction thereof, it is advantageous in improving the pull-out resistance of the tubular body to the joint body.

Further, in the present invention, the pipe insertion portion is inserted into the pipe body and the diameter of the pipe body is reduced, so that the inner peripheral surface of the pipe body and the outer peripheral surface of the small diameter portion are pressure-welded and sealed, and have different diameters. Since the portion is immovably coupled to the pipe body in the axial direction thereof, it is advantageous in improving the pull-out resistance of the tubular body to the joint body.
Further, in the present invention, by inserting the pipe insertion portion into the pipe body, the inner peripheral surface of the first outer diameter portion and the outer peripheral surface of the small diameter portion are sealed by the sealing member, and the diameter of the pipe body is reduced. Since the different diameter portion is immovably coupled to the pipe body in the axial direction thereof, it is advantageous in improving the pull-out resistance of the tubular body to the joint body.
Further, since the inner diameter of the pipe body is gradually increased from the first outer diameter portion to the second outer diameter portion, the pipe body can be easily processed, and the outer diameter is larger than the inner diameter of the second outer diameter portion. It is advantageous in manufacturing the pipe diameter expansion portion and the tubular body corresponding to the hose.
Further, in the present invention, by press-fitting the pipe insertion portion into the pipe body, the inner peripheral surface of the pipe body and the outer peripheral surface of the small diameter portion are sealed by the sealing member, and the different diameter portion is formed into the fitting portion. Since it is fitted so as not to be movable in the axial direction, it is advantageous in improving the pull-out resistance of the tubular body with respect to the joint body.
Further, in the present invention, the different diameter portion can be easily formed as a large diameter portion having an outer diameter larger than that of the small diameter portion.

It is sectional drawing of the joint body and the tubular body of the hose joint fitting of 1st Embodiment. It is sectional drawing of the state in which the tubular body to which the hose is attached is inserted into the pipe part of the joint body of 1st Embodiment. FIG. 5 is a cross-sectional view of a state in which a tubular body to which a hose is attached is inserted into the pipe portion of the joint body of the first embodiment and the pipe body is crimped. It is sectional drawing of the state which the end part of the hose is connected to the hose joint fitting of the 1st Embodiment. It is sectional drawing of the joint body and the tubular body of the hose joint fitting of the 2nd Embodiment. It is sectional drawing of the state in which the end of the hose is connected to the hose joint fitting of the 2nd Embodiment. It is sectional drawing of the joint body and the tubular body of the hose joint fitting of the 3rd Embodiment. It is sectional drawing of the state in which the tubular body to which the hose is attached is inserted into the pipe part of the joint body of the 3rd Embodiment. FIG. 5 is a cross-sectional view of a state in which a tubular body to which a hose is attached is inserted into the pipe portion of the joint body of the third embodiment and the pipe body is crimped. It is sectional drawing of the state in which the end of the hose is connected to the hose joint fitting of the 3rd Embodiment. It is sectional drawing of the state in which the tubular body with the hose attached is inserted into the pipe part of the joint body of the modification of the 3rd Embodiment. It is sectional drawing of the joint body and the tubular body of the hose joint fitting of 4th Embodiment. FIG. 5 is a cross-sectional view of a state in which a tubular body with a hose attached is inserted into the pipe portion of the joint body of the fourth embodiment and the large diameter portion is fitted to the fitting portion. It is sectional drawing of the state in which the end of the hose is connected to the hose joint fitting of the 4th Embodiment. (A) to (E) are diagrams showing a modified example of a tubular body. (A) to (C) are diagrams showing a modified example of a tubular body.

Hereinafter, the hose joint fitting according to the embodiment of the present invention will be described with reference to the drawings.
(First Embodiment)
First, the first embodiment will be described with reference to FIGS. 1 to 4.
As shown in FIG. 3, the hose joint fitting 10 is attached to the end of the hose in order to connect the hose 12 to an apparatus or the like.
The hose 12 is a flexible tube for feeding a fluid such as a liquid or a gas, and a hose having various conventionally known structures can be adopted.
In the present embodiment, the hose joint fitting 10 is an eye joint fitting.
As shown in FIG. 1, the hose joint fitting 10 includes a metal joint body 14A, a metal tubular body 16A, and a sealing member 18.
The joint body 14A includes a union bolt insertion portion 20 and a pipe portion 22 to which the end portion of the hose is connected.
As shown in FIG. 1, the union bolt insertion portion 20 is a portion through which a union bolt having a flow path formed from the outer peripheral surface to the inside thereof is inserted, and the union bolt insertion portion 20 has a union bolt insertion hole 2002. It comprises a formed tubular wall 2004.
On the inner peripheral surface of the tubular wall 2004, recesses 2006 for connecting to the flow path on the outer peripheral surface of the union bolt are formed on the entire circumference of the inner peripheral surface.

The pipe portion 22 is a portion to which the hose 12 is connected, and includes a pipe main body 24 arranged coaxially, a pipe inclined surface portion 26, and a pipe diameter expanding portion 28.
One end of the pipe body 24 is fixed to the hole 2008 of the tubular wall 2004 by welding, the pipe body 24 projects from the tubular wall 2004, and the inside of the pipe body 24 communicates with the recess 2006.
Therefore, in the present embodiment, the joint body 14A has a pipe portion 22 at one end in the axial direction thereof and a tubular wall 2004 at the other end in the axial direction thereof.
The pipe main body 24 has a uniform inner diameter and a uniform outer diameter, and is formed so that the diameter can be reduced inward in the radial direction. The pipe main body 24 of the present embodiment is reduced in diameter by crimping.
The pipe inclined surface portion 26 is formed at a boundary between the pipe main body 24 and the pipe enlarged diameter portion 28 by an inclined surface whose radius gradually increases from the pipe main body 24 to the pipe enlarged diameter portion 28.
The pipe enlarged diameter portion 28 is provided at the end of the pipe inclined surface portion 26, and is formed so as to have a uniform inner diameter and a uniform outer diameter having a larger inner diameter and outer diameter than the pipe main body 24 so that the diameter can be reduced inward in the radial direction. The diameter of the pipe enlarged portion 28 of the present embodiment is reduced by crimping.

Since the pipe inclined surface portion 26 and the pipe diameter expanding portion 28 are easily formed by subjecting the end portion of the pipe portion 22 to a pipe expanding process, the pipe portion 22 is easily manufactured from the pipe material.
In the pipe expansion process, for example, with the pipe body 24 fixedly supported, a pipe expansion jig having an outer diameter larger than the inner diameter of the pipe body 24 is press-fitted into the pipe portion 22 located at the end of the pipe body 24. Therefore, the portion of the pipe portion 22 located at the end of the pipe main body 24 is gradually expanded to form the pipe inclined surface portion 26 and the pipe diameter expanding portion 28.
The method of tube expansion is not limited to the above method, and various conventionally known methods can be used.

A fluid such as a liquid (for example, oil) or a gas passes through the central hole of the tubular body 16A.
As shown in FIGS. 1 and 3, the tubular body 16A is provided in a pipe insertion portion 30 provided in one portion in the longitudinal direction thereof and inserted into the pipe body 24, and a hose provided in the other portion in the longitudinal direction thereof. It has a hose mounting portion 32 that is inserted into the pipe diameter expanding portion 28 in a state where the end portion of the pipe is mounted.
It should be noted that the tip of the hose mounting portion 32 is optionally provided with an inclined portion 3202 formed of a conical surface whose outer diameter decreases toward the tip so that the hose can be easily mounted.
On the outer peripheral portion of the hose mounting portion 32 excluding the tip portion, when the pipe diameter expansion portion 28 is crimped by the first crimping claw 50 (see FIG. 4), the pipe diameter expansion portion 28 and the end portion of the hose 12 are formed. Concavo-convex portions 3204 are provided in which concave portions and convex portions are alternately arranged in the axial direction or the circumferential direction so that the hose mounting portion 32 is integrated.
When the hose mounting portion 32 to which the end of the hose 12 is mounted is inserted into the pipe diameter expanding portion 28 and the pipe diameter expanding portion 28 is crimped by the first crimping claw 50, the pipe diameter expanding portion 28 and the pipe diameter expanding portion 28 are attached. Since the end of the hose 12 and the hose mounting portion 32 may be integrated, the uneven portion 3204 can be omitted depending on the material constituting the tubular body 16A, the wall thickness of the hose mounting portion 32, and the like. The tubular body 16A including the hose mounting portion 32 and the pipe insertion portion 30 may be made of a pipe material having a uniform inner diameter and a uniform outer diameter.
Further, before crimping the pipe diameter-expanded portion 28 by the first crimping claw 50, the end portion of the hose 12 is mounted on the hose mounting portion 32, which is optional.

As shown in FIGS. 2 and 3, the pipe insertion portion 30 has a small diameter portion 3002 that is formed with a uniform outer diameter smaller than the inner diameter of the pipe main body 24 and can be inserted into the pipe main body 24.
A different diameter portion 30A having a predetermined width along the longitudinal direction of the small diameter portion 3002 and having an outer diameter different from that of the small diameter portion 3002 is provided in the middle portion in the longitudinal direction of the small diameter portion 3002.
In the present embodiment, the different diameter portion 30A is formed by a large diameter portion 3004 having an outer diameter smaller than the inner diameter of the pipe enlarged diameter portion 28 and larger than the outer diameter of the small diameter portion 3002.
As shown in FIGS. 2 and 3, when the pipe insertion portion 30 is inserted into the pipe main body 24 and the pipe main body 24 is crimped by the second crimping claw 52, the large diameter portion 3004 has its axis centered on the pipe main body 24. Combine immovably in the direction.
That is, since the second crimping claw 52 has a cylindrical second mold surface 5202 having a recess, when the pipe insertion portion 30 is inserted into the pipe body 24 and the pipe body 24 is crimped, the pipe is piped. Since the main body 24 is deformed into a shape corresponding to the outer peripheral surfaces of the small diameter portion 3002 and the large diameter portion 3004, the main body 24 is recessed outward in the radial direction via a recess at a position facing the outer peripheral surface of the large diameter portion 2004 of the pipe main body 24. A fitting portion 2402 formed of an annular recess is formed.
In other words, when the pipe body 24 is crimped, the large diameter portion 3004 is in a state of being fitted to the fitting portion 2402, and the large diameter portion 3004 is immovably coupled in the axial direction of the tubular body 16A. The tubular body 16A becomes immovable in the axial direction, and the tubular body 16A is fixed to the joint body 14A.
The tubular body 16A having such a hose mounting portion 32 and a pipe inserting portion 30 is easily manufactured from a metal cylindrical pipe material.
The shape of the tubular body 16A can be appropriately changed depending on the pressure to be crimped, the nature of the fluid flowing inside, and the sealing property with the hose 12.

As shown in FIG. 2, a plurality of annular grooves 3006 are formed on the outer peripheral surface of the small diameter portion 3002 on the side away from the hose mounting portion 32 at intervals in the longitudinal direction of the small diameter portion 3002.
The seal member 18 is mounted on the annular groove 3006 and is provided, and in the present embodiment, an O-ring is used as the seal member.
The small diameter portion 3002 of the pipe insertion portion 30 to which the seal member 18 is mounted is inserted into the pipe body 24, and the seal member 18 is elastically contacted with the inner peripheral surface of the pipe body 24 in a state where the pipe body 24 is crimped and reduced in diameter. , The outer peripheral surface of the small diameter portion 3002 and the inner peripheral surface of the pipe body 24 are formed so as to be sealed by the sealing member 18, and the fluid or gas between the pipe portion 22, the tubular body 16A, and the hose 12 is formed. Leakage is prevented.
Here, the sealing means a state having a liquidtightness to prevent leakage of a liquid such as oil, or a state having an airtightness to prevent leakage of a gas.

Next, a method of using the hose joint fitting 10 of the present embodiment will be described.
In the hose joint fitting 10 of the present embodiment, as shown in FIGS. 2 and 3, the pipe insertion portion 30 of the tubular body 16A to which the seal member 18 is mounted is inserted into the pipe body 24 from the pipe diameter expansion portion 28. , The hose mounting portion 32 with the end portion of the hose 12 mounted is positioned at the pipe diameter expanding portion 28.
Then, the pipe main body 24 is crimped by the second crimping claw 52, and as shown in FIG. 1, the portion of the pipe main body 24 located on the outer side in the radial direction of the large diameter portion 3004 is the large diameter portion 3004 and the second crimping claw. The fitting portion 2402 is formed by being deformed corresponding to the second mold surface 5202 of 52.
As a result, the large diameter portion 3004 is fitted to the fitting portion 2402 of the pipe body 24 that has been deformed corresponding to the large diameter portion 3004, and the large diameter portion 3004 cannot move in the axial direction of the tubular body 16A. The tubular body 16A becomes immovable with respect to the pipe portion 22 in the axial direction, and the pipe main body 24 of the pipe portion 22 and the pipe insertion portion 30 of the tubular body 16A are integrated and fixed.
Further, the sealing member 18 attached to the small diameter portion 3002 of the pipe insertion portion 30 comes into contact with the inner peripheral surface of the pipe body 24, so that the inner peripheral surface of the pipe body 24 and the outer peripheral surface of the small diameter portion 3002 of the pipe insertion portion 30 are brought into contact with each other. The hose joint fitting 10 is obtained by sealing the space between the hose and the fitting.
Further, as shown in FIG. 4, when the pipe diameter-expanded portion 28 is crimped by the first crimping claw 50, the concave-convex first mold surface 5002 of the first crimping claw 50 causes the hose mounting portion 32 in the radial direction. The portion of the pipe diameter-expanded portion 28 located on the outside is deformed corresponding to the first mold surface 5002, and the pipe diameter-expanded portion 28, the end of the hose 12, and the hose mounting portion 32 are integrated to form the hose 12. The end is connected to the hose fitting 10.
The first crimping claw 50 and the second crimping claw 52 may have any shape such as flat, barrel, wave, flare, etc., as long as the pipe body 24 and the pipe enlarged diameter portion 28 can be crimped. ..
Further, in the present embodiment, the diameter of the pipe portion 22 is reduced by crimping with the first crimping portion 50 and the second crimping claw 52, but the diameter is reduced by rolling or the like.

As described above, the hose joint fitting 10 of the first embodiment has the inner peripheral surface of the pipe body 24 by inserting the pipe insertion portion 30 into the pipe body 24 and crimping and reducing the diameter of the pipe body 24. The outer peripheral surface of the small diameter portion 3002 is sealed by the sealing member 18, and the large diameter portion 3004 is immovably coupled to the pipe body 24 via the fitting portion 2402 in the axial direction thereof.
Further, by crimping and reducing the diameter of the pipe diameter-expanding portion 28, the hose mounting portion 32, the end of the hose 12, and the pipe diameter-expanding portion 28 are integrated, and the hose joint fitting 10 and the end of the hose 12 are integrated. And are combined.

According to the hose joint fitting 10 of the first embodiment, the pipe portion 22 constituting the hose joint fitting 10 can be easily manufactured by subjecting the pipe material to a pipe expansion process, and the cylinder constituting the hose joint fitting 10. Since the shape 16A also has a simple structure, it can be easily manufactured from a pipe material.
Therefore, according to the present invention, the hose joint fitting 10 can be manufactured by omitting the step of forming a concave groove for attaching the socket to the nipple and the step of attaching the socket to the nipple via the concave groove as in the conventional case, and the hose joint can be manufactured. This is advantageous in simplifying the manufacturing process of the metal fitting 10 and reducing the cost.
Further, according to the present invention, since the diameter of the pipe body 24 is reduced, the large diameter portion 3002 is immovably coupled to the pipe body 24 via the fitting portion 2402 in the axial direction thereof, so that a high pressure is applied. Even when the hose joint fitting 10 of the first embodiment is used for a hydraulic pipe or the like that operates repeatedly, the tubular body 16A to which the hose 12 is attached is prevented from coming off from the joint body 14A, and the joint is joined. This is advantageous in improving the pull-out resistance of the tubular body 16A with respect to the main body 14A.
Further, when the pipe body 24 is crimped, the different diameter portion 30A that is immovably coupled to the pipe body 24 in the axial direction is formed as a large diameter portion 3004 having an outer diameter larger than that of the small diameter portion 3002. The structure of the different diameter portion 30A is simple, which is advantageous in easily forming the different diameter portion 30A.

(Second Embodiment)
The second embodiment will be described with reference to FIGS. 5 and 6.
In the first embodiment, the inner peripheral surface of the pipe body 24 and the outer peripheral surface of the small diameter portion 3002 are sealed by the sealing member 18, whereas in the second embodiment, the pipe body 24 The difference is that the inner peripheral surface and the outer peripheral surface of the small diameter portion 3002 are metal-sealed.
In the following description of the embodiment, the same parts and members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and the parts different from the first embodiment will be emphasized. Explain to.

As shown in FIG. 5, the pipe main body 24 of the present embodiment is formed with a uniform inner diameter and a uniform outer diameter, and the portion where the pipe insertion portion 30 is inserted on the inner peripheral surface of the pipe main body 24 is smooth without unevenness. It is formed as a surface for forming a metal seal 2404.
Further, the outer peripheral surface of the small diameter portion 3002 of the pipe insertion portion 30 of the present embodiment is formed as a smooth surface without unevenness, and is formed as a metal seal forming surface 3008.

In the hose joint fitting 10 of the present embodiment, as shown in FIG. 5, the pipe insertion portion 30 of the tubular body 16B on which the metal seal forming surface 3008 is formed is inserted into the pipe body 24 from the pipe diameter expansion portion 28. , The hose mounting portion 32 with the end portion of the hose 12 mounted is inserted into the pipe diameter expanding portion 28.
Then, when the pipe body 24 is crimped by the second crimping claw 52 (see FIG. 2), as shown in FIG. 6, the pipe body 24 is crushed to form a metal seal forming surface 2404 of the pipe body 24. The metal seal forming surface 3008 of the small diameter portion 3002 is metal-sealed by pressure welding between metals, and fluid or gas from between the metal seal forming surface 2404 of the pipe body 24 and the metal seal forming surface 3008 of the small diameter portion 3002. Leakage is prevented.
Further, as in the first embodiment, the tubular body 16B becomes immovable with respect to the pipe portion 22 via the large diameter portion 3004 and the fitting portion 2402, and the pipe body 24 of the pipe portion 22 becomes immovable. And the pipe insertion portion 30 of the tubular body 16B are integrated and fixed.

As described above, in the hose joint fitting 10 of the second embodiment, the pipe insertion portion 30 is inserted into the pipe main body 24 and the pipe main body 24 is crimped to reduce the diameter, whereby the inner peripheral surface of the pipe main body 24 is reduced. And the outer peripheral surface of the small diameter portion 3002 are metal-sealed, and the space between the inner peripheral surface of the pipe body 24 and the outer peripheral surface of the pipe insertion portion 30 is sealed.
Therefore, according to the present invention, as in the first embodiment, it is advantageous in simplifying the manufacturing process to reduce the cost and improving the pull-out resistance of the tubular body 16B with respect to the joint body 14B. ..

(Third Embodiment)
A third embodiment will be described with reference to FIGS. 7 to 10.
In the first embodiment, the pipe main body 24 is formed with a uniform inner diameter and a uniform outer diameter, whereas in the third embodiment, the inner diameter of the pipe main body 24 is toward the pipe enlarged diameter portion 28. The difference is that it is gradually increasing.
As shown in FIG. 7, the pipe main body 24 of the present embodiment has a first outer diameter portion 2406 and a second outer diameter portion 2408 located between the first outer diameter portion 2406 and the pipe enlarged diameter portion 28. , The inclined portion 2410 connecting the first outer diameter portion 2406 and the second outer diameter portion 2408 is provided.
The first outer diameter portion 2406 is formed at a portion of the pipe main body 24 away from the pipe enlarged diameter portion 28 with a uniform inner diameter and a uniform outer diameter.
The second outer diameter portion 2408 is connected to the first outer diameter portion 2406 via an inclined portion 2410 whose radius gradually increases toward the pipe enlarged diameter portion 28 from the end portion of the first outer diameter portion 2406, and has a uniform inner diameter. It is formed with a uniform outer diameter.
The inner diameter of the second outer diameter portion 2408 is formed to have a uniform dimension having an inner diameter larger than that of the first outer diameter portion 2406 and smaller than the inner diameter of the pipe enlarged diameter portion 28, and the second outer diameter portion 2408 is formed in the radial direction thereof. The diameter can be reduced to.
The seal member 18 is provided by being mounted on the annular groove 3006 formed in the small diameter portion 3002 of the pipe insertion portion 30, and the seal member 18 is provided in a state where the small diameter portion 3002 of the pipe insertion portion 30 is inserted into the pipe body 24. 18 comes into contact with the inner peripheral surface of the first outer diameter portion 2406, and the space between the outer peripheral surface of the small diameter portion 3002 and the inner peripheral surface of the first outer diameter portion 2406 is sealed by the sealing member 18.
The inner diameter of the first outer diameter portion 2406 is formed so that the seal member 18 attached to the small diameter portion 3002 is in contact with the inner peripheral surface of the first outer diameter portion 2406 when the pipe insertion portion 30 is inserted. Has been done.

Next, a method of attaching the hose to the hose joint fitting 10 of the present embodiment will be described.
In the hose joint fitting 10 of the present embodiment, as shown in FIG. 7, the pipe insertion portion 30 of the tubular body 16A to which the seal member 18 is mounted is inserted into the pipe body 24 from the pipe diameter expansion portion 28, and the hose 12 is inserted. The hose mounting portion 32 with the end portion of the hose mounted is inserted into the pipe diameter expanding portion 28.
When the pipe insertion portion 30 is inserted into the pipe body 24, as shown in FIG. 8, the seal member 18 attached to the small diameter portion 3002 of the pipe insertion portion 30 comes into contact with the inner peripheral surface of the first outer diameter portion 2406. As a result, the space between the inner peripheral surface of the first outer diameter portion 2406 of the pipe body 24 and the outer peripheral surface of the small diameter portion 3002 is sealed.
Then, when the inclined portion 2410 and the second outer diameter portion 2408 are crimped by the third crimping claw 54 having the cylindrical surface-shaped third mold surface 5402, the large diameter portion is as shown in FIGS. The large-diameter portion 3004 is fitted to the fitting portion 2402 formed of the annular concave portion deformed corresponding to the 3004, and the large-diameter portion 3004 is immovably coupled in the axial direction of the tubular body 16A. As a result, the tubular body 16A becomes immovable in the axial direction, and the pipe body 24 and the pipe insertion portion 30 are fixed.
Then, as shown in FIG. 10, the pipe diameter-expanded portion 28 is crimped by the first crimping claw 50, so that the pipe diameter-expanded portion 28, the hose mounting portion 32, and the end portion of the hose 12 are integrated. The end of the hose 12 is connected to the hose fitting 10.

As described above, in the hose joint fitting 10 of the third embodiment, the pipe insertion portion 30 is inserted into the pipe main body 24, so that the inner peripheral surface and the small diameter portion 3002 of the first outer diameter portion 2406 of the pipe main body 24 are inserted. The outer peripheral surface of the hose is sealed by the sealing member 18, and the pipe main body 24 is crimped to reduce the diameter, so that the large diameter portion 3004 is immovably coupled to the pipe main body 24 in the axial direction thereof.
Therefore, according to the present invention, as in the first embodiment, it is advantageous in simplifying the manufacturing process to reduce the cost and improving the pull-out resistance of the tubular body 16A with respect to the joint body 14C. ..
Further, since the pipe main body 24 is formed with the first outer diameter portion 2406 and the second outer diameter portion 2408 in a stepwise larger inner diameter, the pipe main body 24 can be easily processed, which is larger than the inner diameter of the second outer diameter portion 2408. It is advantageous in manufacturing the pipe diameter-expanded portion 28 and the tubular body 16A corresponding to the hose 12 having a large outer diameter.

(Modified example of the third embodiment)
A modified example of the third embodiment will be described with reference to FIG.
In the third embodiment, the hose 12 is attached to the hose joint fitting 10 by crimping the pipe diameter-expanding portion 28 after crimping the pipe body 24, whereas in this modified example, the hose 12 is attached. The difference is that the pipe main body 24 and the pipe enlarged diameter portion 28 are simultaneously crimped by the fourth crimping claw 56.
That is, the fourth crimping claw 56 has a fourth mold surface 5602 for crimping the pipe body 24 and a concave-convex fifth mold surface 5604 for crimping the pipe enlarged diameter portion 28.
As a result, when the pipe body 24 and the pipe diameter-expanded portion 28 are simultaneously crimped by the fourth crimping claw 56, the fourth mold surface 5602 crimps the pipe diameter-expanded portion 28 side from the large-diameter portion 3002 in the pipe body 24. By reducing the diameter, a fitting portion 2402 composed of an annular recess corresponding to the large diameter portion 3002 is formed, the large diameter portion 3002 and the fitting portion 2402 are fitted, and the small diameter portion 3002 is the pipe main body 24. It is immovably connected in the axial direction.
Further, the fifth mold surface 5604 is reduced in diameter by crimping the pipe enlarged diameter portion 28, the pipe enlarged diameter portion 28, the end of the hose 12 and the hose mounting portion 32 are integrated, and the hose joint fitting 10 and the hose are integrated. Twelve ends are joined.
The hose joint fitting 10 of the modified example of the third embodiment is advantageous in shortening the manufacturing time because the pipe main body 24 and the pipe enlarged diameter portion 28 are simultaneously crimped in addition to the effect of the third embodiment. It becomes.

(Fourth Embodiment)
A fourth embodiment will be described with reference to FIGS. 12 to 14.
In the first embodiment, the diameter of the pipe body 24 in which the small diameter portion 3002 is inserted is reduced to form a fitting portion 2402 that is immovably fitted to the large diameter portion 3004 in the pipe body 24. On the other hand, in the fourth embodiment, the fitting portion 2402 formed of the annular recess is formed in advance in the pipe main body 24, the diameter of the pipe main body 24 is not reduced, and the large diameter portion 3004 is formed. The difference is that the small diameter portion 3002 is pushed into the pipe main body 24 to fit the large diameter portion 3004 and the fitting portion 2402, and the small diameter portion 3002 and the pipe main body 24 are immovably coupled.
As shown in FIG. 12, the pipe main body 24 of the present embodiment is formed with a uniform inner diameter and a uniform outer diameter, and the outer diameter of the pipe main body 24 is located at a predetermined position on the pipe enlarged diameter portion 28 side of the pipe main body 24. A fitting portion 2402 having a larger outer diameter, that is, a fitting portion 2402 formed of an annular recess projecting outward in the radial direction of the pipe body 24 is formed.
The inner diameter of the pipe main body 24 is formed so that the seal member 18 attached to the small diameter portion 3002 is elastically contacted with the inner peripheral surface of the pipe main body 24 when the pipe insertion portion 30 is inserted.

In the hose joint fitting 10 of the present embodiment, when the pipe insertion portion 30 of the tubular body 16A to which the seal member 18 is mounted is pushed from the pipe diameter expansion portion 28 into the pipe body 24, the pipe is inserted as shown in FIG. The large-diameter portion 3004 of the portion 30 is fitted to the fitting portion 2402 formed on the pipe body 24, and the large-diameter portion 3004 is immovably coupled in the axial direction of the tubular body 16A to form the tubular body 16A. Is immovable in the axial direction, and the pipe body 24 and the pipe insertion portion 30 are fixed.
Further, when the pipe insertion portion 30 is inserted into the pipe main body 24, the seal member 18 attached to the small diameter portion 3002 comes into contact with the inner peripheral surface of the pipe main body 24, so that the inner peripheral surface and the small diameter portion of the pipe main body 24 come into contact with each other. The space between the 3002 and the outer peripheral surface is sealed.
Then, as shown in FIG. 14, the pipe diameter-expanded portion 28 is crimped by the first crimping claw 50, so that the pipe diameter-expanded portion 28, the hose mounting portion 32, and the end portion of the hose 12 are integrated. The end of the hose 12 is connected to the hose fitting 10.

As described above, in the hose joint fitting 10 of the fourth embodiment, the pipe insertion portion 30 is press-fitted into the pipe main body 24, so that the inner peripheral surface of the pipe main body 24 and the outer peripheral surface of the small diameter portion 3002 are sealed members. Along with being sealed by 18, the large diameter portion 3004 is immovably fitted to the fitting portion 2402 in the axial direction thereof.
Therefore, according to the present invention, as in the first embodiment, it is advantageous in simplifying the manufacturing process to reduce the cost and improving the pull-out resistance of the tubular body 16A with respect to the joint body 14D. ..

The structure of the large diameter portion 3004 constituting the different diameter portion 30A is not limited to the structure of the first to fourth embodiments described above, and the pipe body and the pipe insertion portion are movably fixed. Any structure may be used, and various conventionally known structures can be adopted.
Next, with reference to FIG. 15, an example of the shape of the large diameter portion constituting the different diameter portion 30A will be described.
For example, the large-diameter portion 3004A of FIG. 15A has a larger width along the longitudinal direction of the small-diameter portion 3002 than the large-diameter portion 3004 of the above-described embodiment, and the side view has an elliptical shape. It is formed.
The large-diameter portion 3004B of FIG. 15B has a larger width along the longitudinal direction of the small-diameter portion 3002 than the large-diameter portion 3004 of the above-described embodiment, and the side view is formed in a rectangular shape.
The large diameter portion 3004C of FIG. 15C has a circular side view.
The large diameter portion 3004D of FIG. 15 (D) is formed as a conical surface whose radius gradually increases from the front end side to the rear end side when inserted into the pipe body, and the end portion on the rear end side is the small diameter portion 3002. It is formed as a ring plate surface orthogonal to the longitudinal direction of.
The large diameter portion 3004E of FIG. 15 (E) is formed as a conical surface whose radius gradually increases from the rear end side to the tip side when inserted into the pipe body, and the end portion on the tip side is the small diameter portion 3002. It is formed as a ring plate surface orthogonal to the longitudinal direction.
Even if a large-diameter portion having such various shapes is provided, the pipe body can be formed into a large-diameter portion having various shapes by being inserted into the pipe body and crimped as in the first to third embodiments. Correspondingly deformed, the tubular body is immovably coupled to the joint body.
Further, by providing the fitting portion corresponding to the large diameter portion of various shapes in the pipe main body, when the pipe main body is inserted into the pipe main body as in the fourth embodiment, the large diameter portion is fitted to the fitting portion. The tubular body is immovably coupled to the joint body.

In addition, in the above-described first to fourth embodiments and the example of FIG. 15, the case where the different diameter portion 30A is formed by the large diameter portion has been described, but the different diameter portion 30A is formed on the small diameter portion 3002. The outer diameter is different from that of the small diameter part 3002, and the pipe insertion part is inserted into the pipe body and the diameter of the pipe body is reduced. It is not limited, and may be, for example, an annular groove having an outer diameter smaller than the outer diameter of the small diameter portion 3002.
For example, in the small diameter portion 3002 of FIG. 16 (A), instead of the large diameter portion 3004, an annular groove 3010A having a recessed inside in the radial direction as a different diameter portion 30A and having an outer diameter smaller than that of the small diameter portion 3002 is formed, and is annular. The bottom surface of the groove 3010A is formed by a curved surface in which the central portion in the longitudinal direction is most recessed.
In the small diameter portion 3002 of FIG. 16B, instead of the large diameter portion 3004, an annular groove 3010B recessed inward in the radial direction is formed as a different diameter portion 30A, and the annular groove 3010B has a bottom surface formed of a cylindrical surface. , It is formed by a pair of annular surfaces that stand up from both sides of the bottom surface.
In the small diameter portion 3002 of FIG. 16C, instead of the large diameter portion 3004, an annular groove 3010C having a recessed inside in the radial direction and having an outer diameter smaller than that of the small diameter portion is formed as a different diameter portion 30A. The cross section is formed in a V shape.
Even when the annular groove having various shapes is provided as the different diameter portion 30A as described above, the pipe body has various shapes by being inserted into the pipe body and crimped as in the first to third embodiments. A deformed fitting portion is formed corresponding to the annular groove, and the tubular body is immovably coupled to the joint body.
Further, by providing the fitting portion corresponding to the annular groove of various shapes in the pipe body, the annular groove and the fitting portion are fitted when the pipe body is inserted into the pipe body as in the fourth embodiment, and the cylinder is formed. The body is immovably coupled to the joint body.

Further, in the present embodiment, the case where the seal member is mounted on the small diameter portion of the pipe insertion portion has been described, but the seal member seals between the inner peripheral surface of the pipe portion and the outer peripheral surface of the pipe insertion portion. It goes without saying that an annular groove may be provided on the inner peripheral surface of the pipe body, and the seal member may be mounted on the inner peripheral surface of the pipe body via the annular groove.
However, if the seal member is attached to the small diameter portion of the pipe insertion portion as in the embodiment, it is advantageous in easily attaching the seal member as compared with the case where the seal member is attached to the inner peripheral surface of the pipe body.
Further, in the present embodiment, the case where the hose joint fitting is an eye joint fitting has been described, but the hose joint fitting to which the present invention is applied is not limited to the eye joint fitting, and one of the hose joint fittings in the axial direction. A nipple with a socket attached via a groove is located at the end, a hose is attached to the end of the hose inside the radial direction of the socket, and the socket is tightened to separate the socket, the end of the hose, and the nipple. The present invention is applied to various conventionally known hose fittings that integrally connect hoses, that is, various conventionally known hose fittings having a nipple to which a socket is attached.

10 Hose fittings 12 Hose 14A, 14B, 14C, 14D Joint body 16A, 16B Cylindrical body 18 Seal member 22 Pipe part 24 Pipe body 2402 Fitting part 2404 Metal seal forming surface 2406 1st outer diameter part 2408 2nd outer Diameter 2410 Inclined part 26 Pipe inclined surface part 28 Pipe enlarged part 30 Pipe insertion part 30A Different diameter part 3002 Small diameter part 3004 Large diameter part 3006 Circular groove 3008 Metal seal forming surface 32 Hose mounting part 50 1st crimping claw 52 No. 2 crimping claw 54 3rd crimping claw 56 4th crimping claw

Claims (5)

A metal joint body having a pipe portion at one end in the axial direction and a metal tubular body are provided.
The pipe portion includes a pipe body that can be reduced in diameter inside the radius, and a pipe diameter-expanded portion that is provided at the end of the pipe body and has a larger inner diameter and outer diameter than the pipe body and can be reduced in diameter inside the radius. Have,
The tubular body has a pipe insertion portion provided in one portion in the longitudinal direction and inserted into the pipe body, and a hose end portion provided in the other portion in the longitudinal direction and inserted into the pipe diameter expansion portion. Has a hose attachment part to which
The pipe insertion portion has a small diameter portion that can be inserted into the pipe body.
In a state where the small diameter portion is inserted into the pipe body and the diameter of the pipe body is reduced to either the inner peripheral surface of the pipe body or the outer peripheral surface of the small diameter portion, the space between the inner peripheral surface and the outer peripheral surface thereof is formed. A sealing member to seal is attached,
A difference in which the outer diameter of the small diameter portion is different from that of the small diameter portion, the pipe insertion portion is inserted into the pipe body, and the pipe body is reduced in diameter and is immovably coupled to the pipe body in the axial direction thereof. A diameter is provided,
A hose fitting that is characterized by this. A metal joint body having a pipe portion at one end in the axial direction and a metal tubular body are provided.
The pipe portion includes a pipe body that can be reduced in diameter inside the radius, and a pipe diameter-expanded portion that is provided at the end of the pipe body and has a larger inner diameter and outer diameter than the pipe body and can be reduced in diameter inside the radius. Have,
The tubular body has a pipe insertion portion provided in one portion in the longitudinal direction and inserted into the pipe body, and a hose end portion provided in the other portion in the longitudinal direction and inserted into the pipe diameter expansion portion. Has a hose attachment part to which
The pipe insertion portion has a small diameter portion that can be inserted into the pipe body.
The inner peripheral surface of the pipe body and the outer peripheral surface of the small diameter portion are sealed by pressing the inner peripheral surface and the outer peripheral surface of the pipe body in a state where the small diameter portion is inserted into the pipe body and the diameter of the pipe body is reduced. Formed as a metal seal forming surface to stop,
A difference in which the outer diameter of the small diameter portion is different from that of the small diameter portion, the pipe insertion portion is inserted into the pipe body, and the pipe body is reduced in diameter and is immovably coupled to the pipe body in the axial direction thereof. A diameter is provided,
A hose fitting that is characterized by this. A metal joint body having a pipe portion at one end in the axial direction and a metal tubular body are provided.
The pipe portion has a pipe main body and a pipe diameter-expanded portion provided at an end portion of the pipe main body and having an inner diameter and an outer diameter larger than those of the pipe main body and capable of reducing the diameter inside the radius.
A portion of the pipe body away from the pipe diameter-expanded portion is formed as a first outer diameter portion, and a portion between the first outer diameter portion and the pipe diameter-expanded portion is the first outer diameter portion. It is formed as a second outer diameter portion that has a larger inner diameter than the pipe and has a smaller inner diameter than the enlarged diameter portion of the pipe and can be reduced in diameter in the radial direction.
The tubular body has a pipe insertion portion provided in one portion in the longitudinal direction and inserted into the pipe body, and a hose end portion provided in the other portion in the longitudinal direction and inserted into the pipe diameter expansion portion. Has a hose attachment part to which
The pipe insertion portion has a small diameter portion that can be inserted into the pipe body.
With the small diameter portion inserted into the first outer diameter portion on either the inner peripheral surface of the first outer diameter portion or the outer peripheral surface of the small diameter portion, the space between the inner peripheral surface and the outer peripheral surface is sealed. A sealing member to stop is attached,
The outer diameter of the small diameter portion is different from that of the small diameter portion, the pipe insertion portion is inserted into the pipe body, and the second outer diameter portion is reduced in diameter. There is a different diameter part that connects immovably,
A hose fitting that is characterized by this. A metal joint body having a pipe portion at one end in the axial direction and a metal tubular body are provided.
The pipe portion has a pipe main body and a pipe diameter-expanded portion provided at an end portion of the pipe main body and having an inner diameter and an outer diameter larger than those of the pipe main body and capable of reducing the diameter inside the radius.
The tubular body has a pipe insertion portion provided in one portion in the longitudinal direction and inserted into the pipe body, and a hose end portion provided in the other portion in the longitudinal direction and inserted into the pipe diameter expansion portion. Has a hose attachment part to which
The pipe insertion portion has a small diameter portion that can be inserted into the pipe body and a different diameter portion that has a different outer diameter from the small diameter portion.
A seal member that seals between the inner peripheral surface and the outer peripheral surface of the pipe body is attached to either the inner peripheral surface of the pipe body or the outer peripheral surface of the small diameter portion with the small diameter portion inserted into the pipe body. Being done
The pipe body is provided with a fitting portion in which the different diameter portion is immovably fitted in the axial direction of the pipe body.
A hose fitting that is characterized by this. The different diameter portion is formed of a large diameter portion having an outer diameter smaller than the inner diameter of the pipe enlarged diameter portion and larger than the outer diameter of the small diameter portion.
The hose joint fitting according to any one of claims 1 to 4, wherein the hose joint fitting is characterized in that.

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