WO2015119212A1 - Joint structure and production method for joint structure - Google Patents

Abstract

A joint structure (20) equipped with: a male body (21) that is provided to an end of a first pipe and has an engagement groove (25), which extends in the circumferential direction circling a pipe axis (O1), formed on an outer circumferential surface; a female body (22) that is provided to an end of a second pipe, is fitted to the male body (21) from the outside in the radial direction orthogonal to the pipe axis (O1), and has an annular engagement space (27), which has an inner circumferential edge that connects to the engagement groove (25), formed therein; and a restricting ring (24) that is mounted to the engagement groove (25) from the outside in the radial direction, positioned inside the engagement space (27), and restricts the relative movement of the pipes along the direction of the pipe axis (O1). The engagement space (27) is open towards the outside in the radial direction through an opening (27a). In a side cross-section view that is orthogonal to the pipe axis (O1), the opening width (W1) of the opening (27a) is equal to or greater than the outer diameter of the restricting ring (24).

Description

Joint structure and method for manufacturing joint structure

The present invention relates to a joint structure and a method for manufacturing the joint structure.
This application claims priority on February 7, 2014 based on Japanese Patent Application No. 2014-022160 for which it applied to Japan, and uses the content here.

Conventionally, for example, as shown in Patent Document 1 below, a joint structure that connects a first pipe and a second pipe in a state in which relative movement along the pipe axis direction of both the pipes is regulated is known. ing. In this joint structure, a ring-shaped outer annular groove is formed on the inner peripheral surface on one end side of the first pipe, and one end side of the second pipe is formed so as to be insertable into the first pipe. A ring-shaped inner annular groove is formed on the outer peripheral surface of the second pipe, and the inner annular groove faces the outer annular groove in an inserted state in which the second pipe is inserted into the first pipe. The joint structure further includes an engagement ring, and the engagement ring engages both the inner annular groove and the outer annular groove.

Japanese Unexamined Patent Publication No. 9-229259

However, in the conventional joint structure, there is room for improvement in terms of facilitating manufacturing, for example, facilitating the processing of parts and facilitating the combination of parts. It should be noted that this joint structure can be formed at low cost by facilitating the manufacture in this way.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a joint structure and a joint structure manufacturing method capable of facilitating manufacture.

In order to solve the above problems, the present invention proposes the following means.
A joint structure according to the present invention is a joint structure that connects a first pipe and a second pipe in a state in which relative movement along the pipe axis direction of both the pipes is restricted, and the end of the first pipe And a male body having a circumferentially extending engaging groove that circulates around the pipe axis, and an end of the second pipe. The male body is orthogonal to the pipe axis. A female body that is fitted from the outside in the radial direction and has an annular engagement space in which the inner peripheral edge portion is connected to the engagement groove, and is fitted into the engagement groove from the outside in the radial direction and in the engagement space And the engagement space opens radially outward through the opening, and the opening width of the opening is the outside of the restriction ring in a cross-sectional view orthogonal to the pipe axis. It is more than the diameter.

In the present invention, when both pipes try to move relative to each other along the pipe axis direction, the restriction ring is separately engaged with the side wall surface facing the pipe axis direction in each of the engagement groove and the engagement space. Thereby, the relative movement along the pipe-axis direction of both piping is controlled.
According to this joint structure, since the engagement space is opened toward the outside in the radial direction through the opening, when the female body is formed, for example, a process for processing the female body such as a die or a cutting tool is added. The tool can be inserted into and removed from the engagement space through the opening. In addition, since the engagement space is opened toward the outside in the radial direction through the opening, when combining the components of this joint structure, for example, after fitting the male body into the female body, the restriction ring is opened. It is also possible to enter the engagement space and attach it to the engagement groove.
Furthermore, since the opening width of the opening is greater than or equal to the outer diameter of the restriction ring in a cross-sectional view, it is allowed to enter the engagement space through the opening or the processing tool inserted into and extracted from the engagement space through the opening. It can suppress that a control ring is caught in the opening peripheral part of an opening part.
As described above, for example, it becomes possible to facilitate the processing of components, facilitate the combination of components, and the like, and facilitate the manufacture of this joint structure. Thereby, for example, this joint structure can be formed at low cost.
In addition, since the engagement space opens toward the outside in the radial direction through the opening, it is possible to visually recognize the situation where the restriction ring is mounted in the engagement groove from the outside through the opening. The handleability of the joint structure can be improved.

Further, in a cross-sectional view, the engagement space may be formed linearly from the piping axis toward the opening.

In this case, since the engagement space is formed in a straight line from the pipe shaft toward the opening in a cross-sectional view, the engagement tool is inserted into or removed from the engagement space through the opening or through the opening. The regulation ring that is allowed to enter the joint space can be linearly moved between the pipe shaft and the opening in the engagement space, and further manufacturing can be facilitated.

Also, a pair of openings may be provided on both sides with the piping shaft in between.

In this case, since a pair of openings are provided on both sides sandwiching the piping shaft, for example, a pair of processing tools can be inserted / extracted simultaneously from the engagement space through the pair of openings, or the processing tool can be inserted / extracted. It is possible to appropriately select a part and an opening through which the restriction ring is inserted from a pair of openings, and further manufacturing can be facilitated.
Moreover, since a pair of opening part is provided in the both sides which pinched | interposed the piping axis | shaft, the intensity | strength of this female body is determined by the part located between a pair of opening parts along the circumferential direction among female bodies. Can be maintained.

The female body may be made of resin.

In this case, since the female body is made of resin, it is possible to remarkably facilitate the production of the female body by inserting and removing the processing tool into and out of the engagement space through the opening as described above.

Further, the female body may be formed of a resin material containing a reinforcing material.

In this case, since the female body is formed of a resin material containing a reinforcing material, even if the engagement space has an opening as in the female body, the strength is maintained and the durability is maintained. Sex can be maintained.
Moreover, since the female body can be maintained with the strength of the female body by forming the female body with the resin material containing the reinforcing material in this way, there is a restriction on the shape of the female body for the purpose of maintaining the strength of the female body. Occurrence can be suppressed, and the appearance and workability of this joint structure can be improved.

Also, the female body may be formed by injection molding.

In this case, since the female body is formed by injection molding, when the mold as the processing tool is removed from the female body, the female body is formed in the space forming portion that forms the engagement space in the mold. This space forming portion can be extracted from the opening without overriding the inner peripheral surface in the pipe axis direction, and the manufacture can be facilitated.
Further, since the female body is formed by injection molding, for example, as described above, even if the female body is formed of a resin material containing a reinforcing material, the female body can be formed with high accuracy. Thus, a female body with durability can be easily manufactured.

Further, the restriction ring may be formed with a through hole that passes through the restriction ring in the radial direction and through which the male body passes in the radial direction while elastically expanding and contracting the restriction ring.

In this case, since the passage hole is formed in the restriction ring, when attaching the restriction ring to the engagement groove, the male body and the restriction ring are in a state where the passage hole of the restriction ring faces the male body. By relatively moving in the radial direction, the male body can pass through the passage hole while elastically expanding and contracting the regulating ring. As a result, the regulation ring that has entered the engagement space through the opening can be easily mounted in the engagement groove.
Further, as described above, since the opening width of the opening is greater than or equal to the outer diameter of the restriction ring in the cross-sectional view, for example, even when the restriction ring is elastically deformed by the male body to expand its diameter, etc. The restriction ring can be reliably prevented from being caught on the opening peripheral edge of the opening.

Further, the regulating ring may be mounted in the engaging groove in a state where it is biased inward in the radial direction by the elastic restoring force of the regulating ring.

In this case, since the restriction ring is attached to the engagement groove in a state of being urged inward in the radial direction by the elastic restoring force of the restriction ring, the restriction ring is detached from the engagement groove. Can be suppressed, and relative movement along the pipe axis direction of both pipes can be reliably regulated.

The joint structure manufacturing method according to the present invention is a joint structure manufacturing method for forming a joint structure, and after fitting the male body into the female body, the restricting ring enters the engagement space from the opening. And attach it to the engaging groove.

According to the present invention, after fitting the male body into the female body, the regulating ring is inserted into the engagement space from the opening and attached to the engagement groove. For example, the male body is fitted into the female body. Sometimes, it is not necessary for the regulating ring to get over the inner peripheral surface of the female body or the outer peripheral surface of the male body, and the manufacture of this joint structure can be facilitated. That is, for example, when the male ring is fitted into the female body when the male body is fitted into the female body when the regulating ring is moved over the inner circumferential surface of the female body or the outer circumferential surface of the male body, In addition, since it is necessary to press-fit the male body into the female body, there is a problem that the working place is limited so that force can be applied to both pipes by dedicated equipment.
Further, as described above, when the male body is fitted into the female body, there is no need to get over the inner peripheral surface of the female body and the outer peripheral surface of the male body when the restricting ring is fitted. It is possible to form a metal material or other materials with high hardness, and in the joint structure formed by this manufacturing method, it is easy to firmly restrict relative movement along the pipe axis direction of both pipes. it can.

According to the present invention, it is possible to facilitate the manufacture of the joint structure.

It is a half sectional view showing the joint structure concerning a 1st embodiment of the present invention. FIG. 2 is a transverse sectional view taken along line AA shown in FIG. It is a cross-sectional view showing a joint structure according to a second embodiment of the present invention. It is a half sectional view showing a joint structure concerning a 3rd embodiment of the present invention. FIG. 5 is a transverse sectional view taken along line BB shown in FIG. It is a cross-sectional view showing a joint structure according to a modification of the third embodiment of the present invention. It is a transverse cross section showing the joint structure concerning a 4th embodiment of the present invention. It is a cross-sectional view showing a joint structure according to a fifth embodiment of the present invention. It is a cross-sectional view showing a joint structure according to a sixth embodiment of the present invention. It is a cross-sectional view showing a joint structure according to a modification of the sixth embodiment of the present invention. It is a front view of the control ring which comprises the joint structure which concerns on the 1st modification of this invention. It is a front view of the control ring which comprises the joint structure which concerns on the 2nd modification of this invention.

(First embodiment)
Hereinafter, a joint structure according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the joint structure 20 has a circumferential direction in which the first pipe 11 and the second pipe 12 are restricted from relative movement along the pipe axis O1 direction of both the pipes 11 and 12. This is a pipe joint with a universal mechanism that is relatively rotatably connected to the pipe.

The first pipe 11 and the second pipe 12 are connected to each other via the joint structure 20 to constitute the connection pipe 10. The connecting pipe 10 transfers a liquid or a gas, for example, a fluid such as water, oil, or air. In the connection pipe 10, a connection path 13 constituted by the inside of the first pipe 11 and the inside of the second pipe 12 is formed. The connection path 13 is provided over the entire length of the connection pipe 10, and fluid flows through the connection path 13.

The first pipe 11 and the second pipe 12 are made of, for example, a rubber material, a resin material, a metal material, or the like. Moreover, as the 1st piping 11 and the 2nd piping 12, a tube, a hose, a pipe | tube etc. are mentioned, for example. Furthermore, as each shape of the 1st piping 11 and the 2nd piping 12, the shape which makes linear shape as a whole, the shape which makes L shape as a whole, etc. are mentioned.

The joint structure 20 includes a male body 21, a female body 22, a seal ring 23, and a restriction ring 24.
Here, the male body 21 is provided at the end of the first pipe 11, and the female body 22 is provided at the end of the second pipe 12. The male body 21 and the female body 22 are cylindrical. And are fitted to each other. And each central axis line of the edge part in which the male body 21 was provided in the 1st piping 11, and the edge part in which the female body 22 was provided in the 2nd piping 12 is located on a common axis. Hereinafter, this common shaft is referred to as a piping axis O1, the first piping 11 side is referred to as one side, the second piping 12 side is referred to as the other side, and the direction orthogonal to the piping axis O1 is defined along the piping axis O1 direction. The radial direction is referred to as the circumferential direction.

The outer peripheral surface of the male body 21 is gradually reduced in a stepped shape from one side to the other side. The large-diameter first peripheral surface portion 21a positioned on one side and the small-diameter first surface positioned on the other side. 2 circumferential surface portion 21b.
On the outer peripheral surface of the male body 21, an engagement groove 25 and an arrangement groove 26 extending in the circumferential direction are formed. The engagement groove 25 is formed continuously on the first circumferential surface portion 21a over the entire circumference in the circumferential direction. The arrangement groove 26 is formed in the second peripheral surface portion 21b in the male body 21 at a position shifted in the pipe axis O1 direction with respect to the engagement groove 25, and continuously extends over the entire circumference in the circumferential direction.

The female body 22 is fitted to the male body 21 from the outside in the radial direction. The inner peripheral surface of the female body 22 is gradually reduced in a step shape from one side to the other side.
The female body 22 is formed with an annular engagement space 27 whose inner peripheral edge is connected to the engagement groove 25. The engagement space 27 is disposed at the same position in the direction of the engagement groove 25 and the pipe axis O1. The inner peripheral edge of the engagement space 27 is continuously open on the inner peripheral surface of the female body 22 over the entire circumference in the circumferential direction, and faces the bottom wall surface facing the radially outer side in the engagement groove 25. Yes.

The seal ring 23 is disposed between the outer peripheral surface of the male body 21 and the inner peripheral surface of the female body 22, and seals between the outer peripheral surface and the inner peripheral surface. The seal ring 23 is formed in an annular shape by an elastic body such as a rubber material, and is sandwiched between the outer peripheral surface of the male body 21 and the inner peripheral surface of the female body 22 in a radially compressed state. In the present embodiment, the seal ring 23 is disposed in the arrangement groove 26 of the male body 21.

As shown in FIGS. 1 and 2, the restriction ring 24 is attached to the engagement groove 25 from the outside in the radial direction and is disposed in the engagement space 27, and extends along the direction of the pipe axis O <b> 1 of both the pipes 11 and 12. Regulate relative movement. The regulation ring 24 is formed in an annular shape from, for example, a metal material, a rubber material, a resin material, or the like. Examples of the resin material include thermoplastic resins, and specific examples include POM (polyacetal) and PPS (polyphenylene sulfide). Examples of the metal material include steel, copper, aluminum, and stainless steel. The restricting ring 24 is formed with a passage hole 24a penetrating the restricting ring 24 in the radial direction. The male body 21 passes through the passage hole 24a in the radial direction while elastically expanding and contracting the regulating ring 24.

The restricting ring 24 is elastically deformed outward in the radial direction and is urged inward in the radial direction by an elastic restoring force, or the inner diameter of the regulating ring 24 is not elastically deformed in the radial direction. It is mounted in the engagement groove 25 in a state substantially coincident with the inner diameter. The inner peripheral edge of the restriction ring 24 is in pressure contact with or in contact with the bottom wall surface of the engagement groove 25. The outer diameter of the restriction ring 24 is substantially the same as or larger than the detached state in which the regulating ring 24 is detached from the engaging groove 25 in the mounted state. The outer diameter of the restriction ring 24 in the mounted state is larger than the outer diameter of the first peripheral surface portion 21 a that is the outer peripheral surface of the male body 21.

In the present embodiment, the engagement space 27 is opened outward in the radial direction through the opening 27a. In the illustrated example, the opening 27a is exposed to the outside of the joint structure 20 and is not covered from the outside in the radial direction by other members. As shown in FIG. 1, in a side view of the female body 22 as viewed from the outside in the radial direction, the opening 27a is formed in a slit shape that is long in the circumferential direction, and is not open toward both sides in the direction of the pipe axis O1. It is. The opening 27a is continuously opened over the entire length in the circumferential direction of the opening 27a. Further, as shown in FIG. 2, the opening width W <b> 1 of the opening 27 a is equal to or larger than the outer diameter of the regulating ring 24 in the mounted state in a cross-sectional view orthogonal to the piping axis O <b> 1.

Here, in the present embodiment, a pair of openings 27a are provided on both sides of the piping axis O1, and the engagement space 27 opens toward both sides in the radial direction. The pair of openings 27a are arranged coaxially with each other, and the central axes of these openings 27a are both located on a reference axis O2 orthogonal to the piping axis O1. In a cross-sectional view, the engagement space 27 is linearly formed from the pipe axis O1 toward the opening 27a, and the engagement space 27 is linearly formed over the entire length in the direction of the reference axis O2. In the engagement space 27, the space width W2 along the direction of the orthogonal axis O3 orthogonal to both the pipe axis O1 and the reference axis O2 is the same over the entire length in the direction of the reference axis O2. A wall surface facing the direction of the orthogonal axis O3 in the engagement space 27 extends straight along the direction of the reference axis O2, and is separated from the restriction ring 24 in the direction of the orthogonal axis O3.

By the way, the male body 21 and the female body 22 can be formed integrally with the first pipe 11 and the second pipe 12, respectively, or formed separately from the first pipe 11 and the second pipe 12, respectively. . Each of the male body 21 and the female body 22 can be formed of, for example, the same material as the regulation ring 24, specifically, a rubber material, a resin material, a metal material, or the like. Among these materials, for example, when a resin material is employed, the male body 21 and the female body 22 can be reduced in weight.
In the present embodiment, the female body 22 is made of resin and is formed of a resin material containing a reinforcing material. Examples of the reinforcing material include reinforced fibers, specifically glass fibers, and examples of the resin material containing the reinforcing material include fiber reinforced plastics, specifically 40% glass fiber-containing PPS.

Next, an example of a joint structure manufacturing method will be described.

First, a forming process for forming each member of the male body 21, the female body 22, the seal ring 23, and the restriction ring 24 is performed. In addition, the material which forms each member can be suitably selected according to the specification of this joint structure 20, a use, an environment, etc.

Here, in the forming step, the female body 22 among the above-described members is formed by injection molding using a mold (not shown). The mold includes an inner mold and an outer mold (not shown). The inner mold is disposed inside the female body 22 to form the inner peripheral surface of the female body 22, and the outer mold is disposed outside the female body 22 to form the outer peripheral surface of the female body 22. The outer mold is divided into two in the direction of the reference axis O2 around the piping axis O1, and is constituted by a pair of divided molds.
The split mold is provided with a space forming portion that forms the engagement space 27. The space forming portions are separately provided in the pair of split molds, and each space forming portion forms a split space in which the engagement space 27 is divided into two in the direction of the reference axis O2 with respect to the piping axis O1. The space forming portion projects linearly from the split mold toward the inside in the direction of the reference axis O2.

When forming the female body 22 using a mold, first, the inner mold and the outer mold are combined to form the mold, and a resin material is injected into the mold to form the female body 22. The mold is removed from the body 22. At this time, the inner mold is removed from the female body 22 in the direction of the piping axis O1. On the other hand, the outer mold is removed from the female body 22 by linearly moving each of the pair of split molds toward the outside in the direction of the reference axis O2. Thereby, the female body 22 is formed.

Next, a fitting process for fitting the male body 21 into the female body 22 is performed. At this time, the male body 21 is fitted into the female body 22 with the seal ring 23 mounted in the arrangement groove 26, and the engagement groove 25 of the male body 21 and the engagement space 27 of the female body 22 are piped. Align in the direction of the axis O1.

Thereafter, a mounting step is performed in which the restriction ring 24 is inserted into the engagement space 27 from the opening 27 a and mounted in the engagement groove 25. In this mounting step, the regulation ring 24 is linearly entered into the engagement space 27 along the reference axis O2 direction from one of the pair of openings 27a.
At this time, the male body 21 and the regulating ring 24 are moved relatively close to each other in the radial direction in a state where the passage hole 24a is directed to the inner side (male body 21) in the reference axis O2 direction. The male body 21 is passed through the passage hole 24a while being elastically expanded and contracted.

In this fitting step, for example, a rod-like mounting tool on which the regulating ring 24 is detachably mounted on the tip may be used. In this case, after the fitting tool with the restriction ring 24 attached enters the engagement space 27 from the opening 27a and the restriction ring 24 is fitted into the engagement groove 25, the attachment tool is opened from the engagement space 27 to the opening part. You may evacuate through 27a.

By the above, the joint structure 20 is formed and both the pipes 11 and 12 are connected.
In this joint structure 20, when both the pipes 11 and 12 move relatively along the pipe axis O <b> 1 direction, the restriction ring 24 faces the pipe axis O <b> 1 direction in each of the engagement groove 25 and the engagement space 27. By separately engaging the side wall surfaces, relative movement along the pipe axis O1 direction of both the pipes 11 and 12 is restricted.

Since the joint structure 20 connects the pipes 11 and 12 so as to be relatively rotatable in the circumferential direction as described above, the positional relation between the pipes 11 and 12 in the circumferential direction is arbitrary positional relation. However, both pipes 11 and 12 can be relatively rotated in the circumferential direction even if they are displaced in the circumferential direction, and the positional relationship in the circumferential direction between both pipes 11 and 12 can be arbitrarily set. .

As described above, according to the joint structure 20 according to the present embodiment, the engagement space 27 opens toward the outside in the radial direction through the opening 27a, so when forming the female body 22, For example, a processing tool such as a mold for processing the female body 22 can be inserted into and extracted from the engagement space 27 through the opening 27a. Further, since the engagement space 27 is opened outward in the radial direction through the opening 27a, when the parts of the joint structure 20 are combined, for example, after the male body 21 is fitted in the female body 22. The regulating ring 24 can be inserted into the engagement space 27 from the opening 27a and attached to the engagement groove 25.
Furthermore, since the opening width W1 of the opening 27a is equal to or larger than the outer diameter of the regulating ring 24 in a cross-sectional view, it is engaged through a processing tool that is inserted into and removed from the engagement space 27 through the opening 27a, or through the opening 27a. It can suppress that the regulation ring 24 made to approach in the space 27 is caught in the opening peripheral part of the opening part 27a.
As described above, according to the joint structure 20 according to the present embodiment, for example, it is possible to facilitate the processing of components, facilitate the combination of components, and the like, and facilitate the manufacture of the joint structure 20. be able to. Thereby, this joint structure 20 can be formed at low cost, for example.

Moreover, since the engagement space 27 is opened toward the outer side in the radial direction through the opening 27a, it is possible to visually recognize the situation where the restriction ring 24 is mounted in the engagement groove 25 from the outside through the opening 27a. It becomes possible, and the handleability of this joint structure 20 can be improved.

In addition, since the engagement space 27 is linearly formed from the pipe axis O1 toward the opening 27a in a cross-sectional view, a processing tool that is inserted into and removed from the engagement space 27 through the opening 27a, or an opening The restriction ring 24 that is allowed to enter the engagement space 27 through the portion 27a can be linearly moved in the engagement space 27 between the pipe axis O1 and the opening 27a, and further manufacturing is facilitated. Can be achieved.

Since a pair of openings 27a are provided on both sides of the pipe axis O1, for example, a pair of processing tools can be inserted / removed simultaneously from the engagement space 27 through the pair of openings 27a, or a processing tool can be inserted / removed. It is possible to appropriately select the opening portion 27a to be opened and the opening portion 27a to which the restriction ring 24 is made to enter from the pair of opening portions 27a, and the manufacturing can be further facilitated.
In addition, since the pair of openings 27a are provided on both sides of the piping axis O1, the female body 22 has a female portion that is positioned between the pair of openings 27a along the circumferential direction. The strength of the body 22 can be maintained.

Further, since the female body 22 is made of resin, as described above, the processing of the female body 22 can be remarkably facilitated by inserting / removing the processing tool into and out of the engagement space 27 through the opening 27a. .

Further, since the female body 22 is formed of a resin material containing a reinforcing material, even if the engaging space 27 has the opening 27a as in the female body 22, the strength is maintained and the durability is maintained. Sex can be maintained.
Also, since the female body 22 is formed of a resin material containing a reinforcing material in this way, the strength of the female body 22 can be maintained, so that the female body 22 can be maintained for the purpose of maintaining the strength of the female body 22. It is possible to suppress the restriction on the shape, and the appearance and workability of the joint structure 20 can be improved.

Further, since the female body 22 is formed by injection molding, when the mold as the processing tool is removed from the female body 22, the inner peripheral surface of the female body 22 is connected to the space forming portion of the mold. This space forming portion can be extracted from the opening 27a without getting over in the direction of the axis O1, and the manufacturing can be facilitated.
Further, since the female body 22 is formed by injection molding, for example, as described above, the female body 22 can be formed with high accuracy even if the female body 22 is formed of a resin material containing a reinforcing material. Therefore, the female body 22 with durability can be easily manufactured.

Further, since the passage hole 24 a is formed in the restriction ring 24, when the restriction ring 24 is attached to the engagement groove 25, the male body 21 and the restriction ring 24 are connected to each other, and the passage hole 24 a of the restriction ring 24 is made to be the male hole. By moving relatively close to the radial direction in a state directed to the body 21, the male body 21 can pass through the passage hole 24a while elastically expanding and contracting the regulating ring 24. Thereby, the restriction ring 24 that has entered the engagement space 27 through the opening 27 a can be easily mounted in the engagement groove 25.
Further, as described above, since the opening width W1 of the opening 27a is equal to or larger than the outer diameter of the restriction ring 24 in the cross-sectional view, for example, the restriction ring 24 is elastically deformed by the male body 21 to expand its diameter. In this case, the restriction ring 24 can be reliably prevented from being caught on the opening peripheral edge of the opening 27a.

Further, since the regulating ring 24 is attached to the engaging groove 25 in a state of being urged inward in the radial direction by the elastic restoring force of the regulating ring 24, the regulating ring 24 is attached to the engaging groove 25. It is possible to prevent the pipes 11 and 12 from being separated from each other, and the relative movement along the pipe axis O1 direction of both the pipes 11 and 12 can be reliably regulated.

Further, according to the method for manufacturing a joint structure according to the present invention, after fitting the male body 21 into the female body 22, the restricting ring 24 enters the engagement space 27 from the opening 27a to engage the engagement groove. 25. Therefore, for example, when the male body 21 is fitted into the female body 22, there is no need for the regulating ring 24 to get over the inner peripheral surface of the female body 22 or the outer peripheral surface of the male body 21. 20 can be easily manufactured. That is, for example, when the regulating ring 24 gets over the inner peripheral surface of the female body 22 and the outer peripheral surface of the male body 21, when the male body 21 is fitted in the female body 22, Since it is necessary to press-fit the male body 21 into the female body 22 by applying a large force along the direction of the piping axis O1, the work place is set so that force can be applied to both the pipes 11 and 12 by dedicated equipment. There are problems such as being limited.
Further, as described above, when the male body 21 is fitted into the female body 22, it is not necessary for the regulating ring 24 to get over the inner peripheral surface of the female body 22 or the outer peripheral surface of the male body 21. Therefore, for example, the restriction ring 24 can be formed of a metal material or other material having high hardness. In the joint structure 20 formed by this manufacturing method, the pipes 11 and 12 are arranged in the direction of the pipe axis O1. It is possible to easily restrict the relative movement along the line.

(Second Embodiment)
Next, a joint structure according to a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

As shown in FIG. 3, in this joint structure 30, one side of the engagement space 27 sandwiching the pipe axis O <b> 1 is provided with an opening 27 a and opens toward the outside in the radial direction, and the other side. Is not open toward the outside in the radial direction. The central axis of the opening 27a is located on the reference axis O2 and is orthogonal to the piping axis O1. In the cross-sectional view, one side portion of the engagement space 27 located on one side with respect to the pipe axis O1 is linearly formed from the pipe axis O1 toward the opening 27a, and is connected to the pipe axis O1. On the other hand, the other side portion located on the other side is gradually reduced in width as it is separated from the piping axis O1 toward the other side. In the other side portion of the engagement space 27, the wall surface facing one side is formed in a concave curved surface shape that is concave toward the other side.

Next, an example of a method for manufacturing this joint structure will be described. Below, the case where the female body 22 is shape | molded in a formation process, Comprising: The case where the female body 22 is shape | molded using the metal mold | die provided with the inner type | mold and outer type | mold which are not shown in figure is demonstrated.

The inner mold is disposed inside the female body 22 to form the inner peripheral surface of the female body 22, and the outer mold is disposed outside the female body 22 to form the outer peripheral surface of the female body 22. The outer mold is divided into two in the direction of the reference axis O2 around the piping axis O1, and is constituted by a pair of divided molds.
The split mold is provided with a space forming portion that forms the engagement space 27. The space forming portion is provided in a split mold located on one side with respect to the piping axis O1 of the pair of split molds, and protrudes linearly from the split mold toward the inside in the direction of the reference axis O2. . The space forming portion is formed with an insertion / extraction hole through which the inner mold is inserted / extracted.

When the female body 22 is formed using a mold, first, the inner mold and the outer mold are combined, the inner mold is inserted into the insertion / extraction hole of the space forming portion, the mold is formed, and the resin material is placed in the mold. After forming the female body 22 by injection, the mold is removed from the female body 22. At this time, first, the inner mold is pulled out from the insertion / extraction hole, and is demolded from the female body 22 toward the pipe axis O1. Then, the outer mold is removed from the female body 22 by linearly moving each of the pair of split molds so as to be separated from each other along the direction of the reference axis O2. Thereby, the female body 22 can be formed.

(Third embodiment)
Next, a joint structure according to a third embodiment of the present invention will be described with reference to FIGS.
In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

4 and 5, in this joint structure 40, a flat surface 41 is formed on the outer peripheral surface of the female body 22. The flat surface 41 is formed on the outer peripheral surface of the female body 22 over the entire length of the female body 22 in the direction of the piping axis O1. The flat surface 41 is formed in a rectangular shape extending in the direction of the piping axis O1 in the plan view of the flat surface 41. The flat surfaces 41 are arranged so as to be paired with the piping axis O1 in the radial direction.

In the present embodiment, at least a part of the opening 27 a of the engagement space 27 is open to the flat surface 41. The opening 27a is disposed inside the flat surface 41 and does not protrude from the flat surface 41 in the direction of the orthogonal axis O3. The central axis (reference axis O2) of the opening 27a passes through the center of the flat surface 41 in the direction of the orthogonal axis O3. In the illustrated example, the size of the opening 27a in the direction of the orthogonal axis O3 is a flat surface. The size is equal to 41 in the direction of the orthogonal axis O3.

As described above, according to the joint structure 40 according to the present embodiment, since at least a part of the opening 27a of the engagement space 27 is open to the flat surface 41, for example, in the female body 22 After the male body 21 is fitted to the restriction ring 24, when the restriction ring 24 enters the engagement space 27 from the opening 27a and is fitted in the engagement groove 25, the opening 27a is easily passed through the restriction ring 24. can do.

In the present embodiment, the configuration in which the flat surface 41 is formed on the female body 22 of the joint structure 20 according to the first embodiment is shown, but the present invention is not limited thereto. For example, as in a joint structure 50 shown in FIG. 6, a configuration in which a flat surface 41 is formed on the female body 22 of the joint structure 30 according to the second embodiment may be adopted.

(Fourth embodiment)
Next, a joint structure according to a fourth embodiment of the present invention will be described with reference to FIG.
In the fourth embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

As shown in FIG. 7, in this joint structure 60, the outer peripheral surface of the female body 22 is formed in a polygonal shape in a cross-sectional view, and the outer peripheral surface of the female body 22 is configured by a plurality of flat surfaces 41. Yes. In the present embodiment, the outer peripheral surface of the female body 22 is formed in a regular octagonal shape in a cross-sectional view, and is configured by eight flat surfaces 41 having the same size and the same shape. . On the outer peripheral surface of the female body 22, four pairs of flat surfaces 41 sandwiching the pipe axis O1 in the radial direction are arranged with their positions shifted in the circumferential direction.

In the present embodiment, the size of the opening 27a in the direction of the orthogonal axis O3 is larger than the size of the flat surface 41 in the direction of the orthogonal axis O3, and the opening 27a protrudes from the flat surface 41 in the direction of the orthogonal axis O3. ing. The opening 27a is formed across a plurality of flat surfaces 41 adjacent in the circumferential direction.
In the present embodiment and the third embodiment described above, the opening 27a may be smaller than the flat surface 41 in the direction of the orthogonal axis O3.

(Fifth embodiment)
Next, a joint structure according to a fifth embodiment of the present invention will be described with reference to FIG.
In the fifth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

As shown in FIG. 8, in this joint structure 70, the space avoiding portion 71 that sandwiches the engaging space 27 in the direction of the orthogonal axis O3 in the female body 22 is in the direction of the reference axis O2 and the direction of the orthogonal axis O3 in the cross sectional view. It is formed in a rectangular shape extending in both directions. Accordingly, for example, the space avoiding portion 71 is reinforced by maintaining the thickness of the space avoiding portion 71 in the direction of the orthogonal axis O3 as compared with a case where the space avoiding portion 71 is formed in a semicircular shape in a cross-sectional view. The durability of the joint structure 70 can be improved. This durability is significantly effective when it is difficult to maintain the strength of the female body 22 from the surface of the material, such as when the female body 22 is made of resin, for example.

(Sixth embodiment)
Next, a joint structure according to a sixth embodiment of the present invention will be described with reference to FIG.
In the sixth embodiment, the same components as those in the fifth embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

As shown in FIG. 9, in the joint structure 80, one opening 27 a of the pair of openings 27 a is divided into two in the circumferential direction by a reinforcing portion 81 provided in the engagement space 27. ing. The reinforcing portion 81 occupies a part of the space in the engagement space 27 along the circumferential direction over the entire length in the direction of the reference axis O2. With this reinforcing portion 81, the female body 22 can be reinforced, and the durability of the joint structure 70 can be further improved.

In the present embodiment, the configuration in which the reinforcing portion 81 is formed on the female body 22 of the joint structure 70 according to the fifth embodiment is shown, but the present invention is not limited thereto. For example, as in the joint structure 90 shown in FIG. 10, a configuration in which the reinforcing portion 81 is formed on the female body 22 of the joint structure 20 according to the first embodiment may be adopted.

The technical scope of the present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, the restriction ring 24 is not limited to the configuration shown in the present embodiment, and a restriction ring 24 as shown in FIGS. 11 and 12 can also be adopted.

A convex curved surface portion 24b is provided at an end portion in the circumferential direction of the regulating ring 24 shown in FIG.
The convex curved surface portions 24b are separately provided at both end portions in the circumferential direction of the regulating ring 24, and both the convex curved surface portions 24b face each other with the passage hole 24a interposed therebetween. The convex curved surface portion 24b is formed in a curved surface shape that is convex toward the passing hole 24a side, and the end portion in the circumferential direction of the regulating ring 24 is curved.
In this case, since the convex curved surface portion 24 b is provided at the circumferential end of the regulating ring 24, when the male body 21 passes the passage hole 24 a in order to attach the regulating ring 24 to the engaging groove 25. In addition, the diameter of the regulating ring 24 can be increased while the convex curved surface portion 24b is in contact with the bottom wall surface of the engaging groove 25, and the regulating ring 24 can be smoothly mounted in the engaging groove 25. The male body 21 can be prevented from being damaged by the restriction ring 24.

The regulation ring 24 shown in FIG. 12 is a so-called E ring defined in JIS B 2805 (1978), for example. The restriction ring 24 includes a main body ring 24c extending in the circumferential direction and a protruding portion 24d protruding from the main body ring 24c inward in the radial direction.
A plurality of projecting portions 24d are provided on the main body ring 24c at intervals in the circumferential direction. In the illustrated example, the main body ring 24c is provided separately at both ends in the circumferential direction and at the central portion in the circumferential direction. ing. The protruding end portion of the protruding portion 24 d is in pressure contact with the bottom wall surface of the engaging groove 25.

In this embodiment, the female body 22 is formed by injection molding, but the present invention is not limited to this. For example, the female body 22 may be formed by cutting. Even in this case, the cutting tool for cutting the female body 22 can be inserted into and removed from the engagement space 27 through the opening 27a, and the manufacture of the joint structures 20 and 30 can be facilitated. it can.

Further, in this embodiment, after the male body 21 is fitted into the female body 22, the restriction ring 24 enters the engagement space 27 from the opening 27a and is attached to the engagement groove 25. Not limited to. For example, the restriction ring 24 may be mounted in the engagement groove 25 before the fitting step, and then the male body 21 may be fitted (press-fitted) into the female body 22.

In the present embodiment, the opening 27a is exposed to the outside of the joint structures 20 and 30, but the present invention is not limited to this. For example, the opening 27a may be covered with a covering member such as an adhesive tape.

Further, in the present embodiment, the regulation ring 24 is elastically deformed toward the outer side in the radial direction and is urged toward the inner side in the radial direction by the elastic restoring force, or is not elastically deformed in the radial direction. Although the inner diameter is fitted to the engagement groove 25 in a state substantially matching the inner diameter of the engagement groove 25, the present invention is not limited to this. For example, the regulating ring 24 may be mounted in the engagement groove 25 in a state where it is elastically deformed toward the inner side in the radial direction and is biased toward the outer side in the radial direction by an elastic restoring force. In this case, the restriction ring 24 can be attached to the engagement groove 25 by loose fitting.

In addition, it is possible to appropriately replace the constituent elements in the present embodiment with known constituent elements without departing from the spirit of the present invention, and the above modification examples may be appropriately combined.

According to the present invention, it is possible to facilitate the manufacture of the joint structure.

11 1st piping 12 2nd piping 20, 30, 40, 50, 60, 70, 80, 90 Joint structure 21 Male body 22 Female body 24 Restriction ring 24a Passing hole 25 Engaging groove 27 Engaging space 27a Opening O1 Piping Axis W1 opening width

Claims (9)

1. A joint structure that connects the first pipe and the second pipe in a state in which relative movement along the pipe axis direction of both the pipes is restricted,
   A male body provided at an end of the first pipe and having an outer circumferential surface formed with an engaging groove extending in a circumferential direction around the pipe axis;
   An annular engagement space is provided at the end of the second pipe and fitted into the male body from the outside in the radial direction orthogonal to the pipe axis, and the inner peripheral edge is connected to the engagement groove. The female body,
   A restriction ring mounted on the engagement groove from the outside in the radial direction and disposed in the engagement space;
   The engagement space opens radially outward through the opening,
   A joint structure in which the opening width of the opening is equal to or larger than the outer diameter of the restriction ring in a cross-sectional view orthogonal to the pipe axis.
2. 2. The joint structure according to claim 1, wherein the engagement space is formed linearly from a pipe shaft toward the opening in the cross-sectional view.
3. The joint structure according to claim 1 or 2, wherein a pair of the openings are provided on both sides of the piping shaft.
4. The joint structure according to any one of claims 1 to 3, wherein the female body is made of resin.
5. The joint structure according to claim 4, wherein the female body is formed of a resin material containing a reinforcing material.
6. The joint structure according to claim 4 or 5, wherein the female body is formed by injection molding.
7. 7. The passage according to claim 1, wherein the restriction ring is formed with a passage hole that passes through the restriction ring in a radial direction and through which the male body passes in a radial direction while elastically expanding and contracting the restriction ring. The joint structure according to claim 1.
8. The joint according to any one of claims 1 to 7, wherein the restriction ring is attached to the engagement groove in a state in which the restriction ring is biased radially inward by an elastic restoring force of the restriction ring. Construction.
9. The joint structure for forming a joint structure according to claim 1, wherein after the male body is fitted into the female body, the restriction ring is inserted into the engagement space from the opening and attached to the engagement groove. Manufacturing method.

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