JP7511239B2 - Pipe nipple fitting and manufacturing method thereof - Google Patents

Description

The present invention relates to a fitting with a pipe nipple and a method for manufacturing a fitting with a pipe nipple.

Patent Document 1 discloses a pipe joint that includes a pipe, a nipple, and a socket. In the pipe joint of Patent Document 1, the pipe and nipple are arranged inside a cylindrical socket. Inside the socket, the flare portion of the pipe and the nipple flange portion of the nipple abut against each other. The flare portion of the pipe is crimped and fixed to the inner surface of the socket on the opposite side to the nipple flange portion. The portion of the inner surface of the socket that is crimped and fixed to the flare portion of the pipe has an uneven shape, which makes it difficult for the pipe to rotate.

JP 2019-100376 A

Conventionally, in order to fix a pipe joint to an automobile part or the like, a metal member such as a bracket that can be screwed onto the outside of a socket has been used. Such a metal member is attached along the circumferential outer surface of the socket via a tubular rubber member. For this reason, the metal member is prone to rotating along the outer surface of the socket.

The present invention aims to provide a fitting with a pipe nipple and a method for manufacturing a fitting with a pipe nipple that can suppress rotation of the pipe nipple and rotation of a resin or metal member arranged on the outside of the socket.

The pipe nipple fitting of the present invention comprises a cylindrical pipe nipple, a cylindrical socket with the pipe nipple disposed inside, and a resin or metal member disposed outside the socket, the pipe nipple having a pipe body, a nipple, and a spool formed between the pipe body and the nipple and having a diameter larger than the outer diameter of the pipe body and the nipple, the socket having a first wall and a second wall disposed on either side of the spool in the axial direction of the socket, and a portion of the socket that overlaps with the pipe body radially is crimped toward the inside of the pipe body, forming a recess on the outer peripheral surface of the socket, and a protrusion that fits into the recess is formed in the resin or metal member.

The method for manufacturing a fitting with a pipe nipple of the present invention is a method for manufacturing a fitting with a pipe nipple, which includes a pipe nipple having a pipe body, a nipple, and a spool formed between them, a socket with the pipe nipple disposed inside, and a metal member disposed outside the socket, and includes a first step of arranging the pipe nipple inside the socket, a second step of pressing the wall of the socket on the opposite side of the spool from the pipe body toward the spool to plastically deform it, and a third step of arranging a tubular part of a metal member outside the part of the socket that overlaps radially with the pipe body, and then pressing the tubular part radially inward toward the pipe body to fix the part of the socket that overlaps radially with the pipe body radially inward to the pipe body, and forming a recess on the outer circumferential surface of the socket and forming a metal member having a metal tubular part with a protrusion that fits into the recess.

From another perspective, the method for manufacturing a fitting with a pipe nipple of the present invention is a method for manufacturing a fitting with a pipe nipple, which includes a pipe nipple having a pipe body, a nipple, and a spool formed between them, a socket with the pipe nipple disposed inside, and a resin member disposed outside the socket, and includes a first step of arranging the pipe nipple inside the socket, a second step of pressing the wall of the socket on the opposite side of the spool from the pipe body toward the spool, thereby plastically deforming it, a third step of crimping the part of the socket that overlaps radially with the pipe body toward the inside in the radial direction to form a recess on the outer circumferential surface of the socket, and a fourth step of placing the crimped part of the socket in a mold, injecting molten resin material into the mold, and solidifying the resin material while the recess is filled with the molten resin material to form a resin member having a protrusion that fits into the recess.

The fitting with a pipe nipple of the present invention can suppress rotation of the pipe nipple and rotation of the resin member or metal member arranged on the outside of the socket. The manufacturing method of the fitting with a pipe nipple of the present invention can obtain a fitting with a pipe nipple that can suppress rotation of the pipe nipple and rotation of the resin member or metal member arranged on the outside of the socket.

FIG. 1 is a half-sectional view of a pipe nipple fitting according to a first embodiment of the present invention. 1A is a half-side cross-sectional view of a pipe nipple, FIG. 1B is a half-side cross-sectional view of a socket and a hose, and FIG. 1C is a half-side cross-sectional view of a resin member. FIG. 2 is an external view of a joint with a pipe nipple with the resin member omitted. 1A to 1C are half-sectional views showing a manufacturing method for a fitting with a pipe nipple in sequence (first step: before inserting the pipe nipple). 1A to 1C are half-sectional views sequentially showing a method for manufacturing a joint with a pipe nipple (second step: before plastic deformation of the socket). 1A to 1C are half-sectional views showing the manufacturing method of a joint with a pipe nipple in sequence (after the second step: plastic deformation of the socket). 10A to 10C are half-sectional views showing the manufacturing method of a joint with a pipe nipple in sequence (after the third step: socket crimping and fixing). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a joint with a pipe nipple (during the fourth step: forming the resin member). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a joint with a pipe nipple (after the fourth step: forming the resin member). 10A to 10C are half-sectional views (after a hose is inserted) sequentially showing a method for manufacturing a fitting with a pipe nipple. FIG. 5 is a perspective view of a pipe nipple fitting according to a second embodiment of the present invention. FIG. 5 is a front view of a pipe nipple fitting according to a second embodiment of the present invention. 13A is a perspective view of the metal member shown in FIG. 11 and FIG. 12, FIG. 13B is a view seen from the b direction of FIG. 13A, and FIG. 13C is a view seen from the c direction of FIG. FIG. 5 is a half-sectional view of a pipe nipple fitting according to a second embodiment of the present invention. FIG. 2 is an external view of a pipe nipple fitting with metal members omitted. 10A to 10C are half-sectional views sequentially showing a method for manufacturing a fitting with a pipe nipple according to a second embodiment (first step: before inserting the pipe nipple). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a joint with a pipe nipple according to a second embodiment (second step: before plastic deformation of the socket). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a joint with a pipe nipple according to a second embodiment (after the second step: plastic deformation of the socket). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a fitting with a pipe nipple according to a second embodiment (third step: before pressing the cylindrical portion). 10A to 10C are half-sectional views sequentially showing a method for manufacturing a fitting with a pipe nipple according to a second embodiment (after the third step: pressing the cylindrical portion). 10A to 10C are half-sectional views (before a hose is inserted) sequentially illustrating a method for manufacturing a joint with a pipe nipple according to a second embodiment. 10A to 10C are half-sectional views (after a hose is inserted) sequentially showing a method for manufacturing a joint with a pipe nipple according to a second embodiment.

First Embodiment
Here, a joint with a pipe nipple according to a first embodiment of the present invention will be described below with reference to Figures 1 to 10. Figure 1 shows a joint with a pipe nipple 1 to which a hose 10 is connected. The joint with a pipe nipple 1 comprises a pipe nipple 2, a socket 4, and a resin member 5. The pipe nipple 2 is arranged inside the socket 4. The resin member 5 is arranged outside the socket 4. The axial direction of the pipe nipple 2 and the axial direction of the socket 4 are substantially the same. Hereinafter, the axial direction of the pipe nipple 2 and the axial direction of the socket 4 may be simply referred to as the "axial direction".

Figures 2(a) to (c) show half-side cross-sectional views of each of the components that make up the pipe nipple fitting 1 and a half-side cross-sectional view of the hose 10.

As shown in FIG. 2(a), the pipe nipple 2 has a pipe body portion 21, a spool portion 22, and a nipple portion 23. The pipe nipple 2 is cylindrical. The spool portion 22 is formed between the pipe body portion 21 and the nipple portion 23 in the axial direction of the pipe nipple 2. The outer diameter of the spool portion 22 is larger than the outer diameter of the pipe body portion 21 and the outer diameter of the nipple portion 23. The outer diameter of the spool portion 22 is the length in a direction perpendicular to the axial direction of the pipe nipple 2.

As shown in FIG. 2(b), the socket 4 is cylindrical. The socket 4 has a first wall portion 41 and a second wall portion 42.

As shown in FIG. 1, the pipe nipple 2 is disposed inside the socket 4. The spool portion 22 is sandwiched between the first wall portion 41 and the second wall portion 42 of the socket 4 in the axial direction of the socket 4. This connects the pipe nipple 2 and the socket 4.

The first wall portion 41 of the socket 4 abuts against the front surface 22a of the spool portion 22. The "front surface 22a" of the spool portion 22 is the surface 22a of the spool portion 22 that is closer to the pipe body portion 21 than the nipple portion 23 (see FIG. 2(a)).

As shown in FIG. 1, the second wall portion 42 of the socket 4 abuts against the back surface 22b of the spool portion 22. The "back surface 22b" of the spool portion 22 is the surface 22b of the spool portion 22 that is closer to the nipple portion 23 than the pipe body portion 21 (see FIG. 2(a)). The second wall portion 42 is fixed to the spool portion 22 by crimping in the axial direction of the socket 4.

In the axial direction of the socket 4, the hose 10 is disposed closer to the nipple portion 23 than the second wall portion 42. The hose 10 is disposed between the socket 4 and the nipple portion 23.

In FIG. 1, the portion of the socket 4 that overlaps radially with the hose 10 is shown as the "hose overlap portion 4x," and the portion that overlaps radially with the pipe main body portion 21 is shown as the "pipe overlap portion 4y."

The hose overlap portion 4x is pressed radially toward the hose 10, forming recesses 4a and 4b in the hose overlap portion 4x. By pressing the hose overlap portion 4x, the hose 10 is fastened to the pipe nipple fitting 1.

The pipe overlapping portion 4y is fixed to the pipe main body 21 by crimping in the radial direction. As a result, a plurality of recesses 4A, 4B, and 4C are formed on the outer peripheral surface of the pipe overlapping portion 4y (see Fig. 2(b) and Fig. 3). As shown in Fig. 3, the plurality of recesses 4A, 4B, and 4C are arranged at intervals in the circumferential direction of the socket 4. By crimping the pipe overlapping portion 4y to the pipe main body 21, rotation of the pipe nipple 2 is suppressed. In Fig. 3, the pipe nipple 2, socket 4, and hose 10 are shown, and the resin member 5 is omitted.

As shown in FIG. 1, the resin members 5 are arranged on the outside of the portion of the socket 4 that overlaps radially with the pipe body 21, the outside of the portion of the socket 4 that overlaps radially with the spool 22, and the outside of the portion of the socket 4 that overlaps radially with the second wall 42. In the socket 4, the resin members 5 are not arranged on the outside of the hose overlapping portion 4x. Therefore, the resin members 5 are not arranged on the outside of the recesses 4a and 4b of the socket 4 either.

The resin member 5 has a protrusion 5A formed thereon that fits into the recess 4A of the socket 4 (see FIG. 2(c)). In addition to the protrusion 5A, the resin member 5 also has protrusions (not shown) formed thereon that fit into other recesses of the socket 4 (e.g., recess 4B and recess 4C in FIG. 3). The resin member 5 has the same number of protrusions formed thereon as the recesses of the socket 4. The resin member 5 is made of polyamide or the like.

As shown in FIG. 1, a screw hole 5a is formed in the resin member 5. By screwing the resin member 5 to an automobile part or the like, the pipe nipple fitting 1 can be attached to the automobile part or the like.

Next, a method for manufacturing the pipe nipple joint 1 will be described with reference to FIGS.
In the above, the socket connected to the pipe nipple 2 is referred to as "socket 4", but below, the socket before being connected to the pipe nipple 2 will be referred to as "socket 104", and the socket connected to the pipe nipple 2 will be referred to as "socket 4" as above. Below, first, the configuration of the "socket 104" before being connected to the pipe nipple 2 will be described, and then the manufacturing method of the joint with a pipe nipple 1 will be described. In the description of the socket 104, the same reference numerals will be used for the same configuration as the socket 4, and the description thereof will be omitted as appropriate.

As shown in FIG. 4, the socket 104 has a first wall portion 41, a third wall portion 143, and a fourth wall portion 144. The inner diameter increases in the order of the first wall portion 41, the third wall portion 143, and the fourth wall portion 144. The first wall portion 41, the third wall portion 143, and the fourth wall portion 144 form the inner wall of the socket 104 in a three-step staircase shape.

As shown in FIG. 4, first, insert the pipe nipple 2 into the socket 104 from the pipe body portion 21, and bring the front surface 22a of the spool portion 22 into contact with the first wall portion 41 of the socket 104 (see FIG. 5).

In this state, a jig or the like is used to apply an axial force to the third wall portion 143 of the socket 104. This causes a portion 143p of the third wall portion 143 to plastically deform, forming the second wall portion 42 (second step, see FIG. 6).

As shown in FIG. 6, the spool portion 22 is sandwiched between the first wall portion 41 and the second wall portion 42. The second wall portion 42 is crimped and fixed to the spool portion 22 in the axial direction of the socket 4. This connects the pipe nipple 2 and the socket 4.

Next, in order to prevent the pipe nipple 2 from rotating, the pipe overlapping portion 4y of the socket 4 is crimped and fixed to the pipe main body portion 21 toward the radial inside of the socket 4. This forms a recess 4A in the pipe overlapping portion 4y (third step, see Figure 7).

Next, in order to form the resin member 5 on the outside of the socket 4, the pipe overlapping portion 4y of the socket 4 and its vicinity are placed in a mold 200. Thereafter, as shown in FIG. 8, molten resin material 105 is injected into the mold 200, and the recess 4A of the socket 4 is filled with the molten resin material 105. The other recesses of the socket 4 (for example, recess 4B and recess 4C in FIG. 3) are also filled with the molten resin material 105. In this state, the resin material 105 is solidified. When the resin material 105 is solidified, the resin member 5 is formed.

Figure 9 shows the pipe nipple fitting 1 removed from the mold 200. A resin member 5 is formed on the outside of the socket 4. A protrusion 5A that fits into the recess 4A of the socket 4 is formed on the resin member 5 (fourth step). The resin member 5 also has protrusions (not shown) that fit into other recesses of the socket 4 (e.g., recess 4B and recess 4C in Figure 3).

When connecting the hose 10 to the fitting 1 with a pipe nipple, the hose 10 is inserted between the socket 4 and the nipple portion 23. As shown in Fig. 10, the hose 10 is fastened to the fitting 1 with a pipe nipple by radially pressing the hose overlap portion 4x of the socket 4 (see Fig. 1).

As described above, the pipe nipple fitting 1 of this embodiment provides the following advantages:

As shown in Fig. 6, the pipe overlapping portion 4y of the socket 4 is crimped and fixed in the radial direction. This prevents the pipe nipple 2 from rotating. Furthermore, by crimping and fixing the pipe overlapping portion 4y, a recess 4A is formed on the outer circumferential surface of the pipe overlapping portion 4y (see Fig. 7). The protrusion 5A of the resin member 5 fits into this recess 4A (see Fig. 1). As a result, when a force is applied to the resin member 5 in a rotational direction, the protrusion 5A gets caught on the socket 4, preventing the resin member 5 from rotating.
In this manner, by utilizing the recess 4A formed by crimping and fixing the socket 4, rotation of the resin member 5 can be suppressed in order to suppress rotation of the pipe nipple 2.
As described above, according to the pipe nipple fitting 1 of this embodiment, rotation of the pipe nipple 2 and rotation of the resin member 5 can be suppressed.

As shown in Figures 1 and 2, the pipe nipple 2 is an integrated member of the pipe body 21, spool 22, and nipple 23. Therefore, the number of parts is smaller than when the pipe nipple 2 is composed of two or more separate members. In addition, the number of manufacturing steps for the pipe nipple fitting 1 can be reduced, and it is easy to assemble. Furthermore, since the pipe nipple 2 is composed of a single member, there is no risk of leakage of the liquid flowing through the pipe nipple 2, compared to when the pipe nipple 2 is composed of two or more separate members that are adjacent to each other.

In the above, the method of insert molding has been described as a method of producing the resin member 5. Specifically, as shown in Fig. 8, the socket 4 to which the pipe nipple 2 is connected is placed in the mold 200, and the molten resin material 105 is injected into the mold 200. In a state in which the recess 4A of the socket 4 is filled with the molten resin material 105, the resin material 105 is solidified. In this way, the resin member 5 is formed on the outside of the socket 4.
By forming the resin member 5 by the above method, as shown in FIG. 1, the convex portion 5A of the resin member 5 is formed along the shape of the concave portion 4A of the socket 4. There is almost no gap between the convex portion 5A of the resin member 5 and the wall portion defining the concave portion 4A of the socket 4. Therefore, the convex portion 5A of the resin member 5 hardly moves in the concave portion 4A of the socket 4. As a result, even if a force in the rotational direction and/or a force along the axial direction of the socket 4 is applied to the resin member 5, the resin member 5 hardly moves. In addition, since there is almost no gap between the convex portion 5A of the resin member 5 and the wall portion defining the concave portion 4A of the socket 4, liquid, foreign matter, etc. hardly penetrate between the convex portion 5A of the resin member 5 and the wall portion defining the concave portion 4A of the socket 4. Therefore, corrosion of the wall portion defining the concave portion 4A of the socket 4 can be suppressed.

As shown in FIG. 3, a plurality of recesses 4A, 4B, and 4C are formed in the pipe overlap portion 4y of the socket 4. The plurality of recesses 4A, 4B, and 4C are arranged at intervals in the circumferential direction of the socket 4. The plurality of protrusions of the resin member 5 fit into the plurality of recesses 4A, 4B, and 4C, respectively, so that the resin member 5 is caught on the socket 4 at a plurality of points in the circumferential direction of the socket 4. This makes it more difficult for the resin member 5 to rotate.

As shown in FIG. 1, the resin member 5 is disposed on the outside of the portion of the socket 4 that overlaps radially with the pipe main body 21, the outside of the portion of the socket 4 that overlaps radially with the spool 22, and the outside of the portion of the socket 4 that overlaps radially with the second wall 42. In the socket 4, the resin member 5 is not disposed on the outside of the hose overlapping portion 4x. In other words, there is an area in the hose overlapping portion 4x that can be pressed from the radial outside. By pressing this area radially inward, the hose 10 can be fastened to the pipe nipple fitting 1.

The resin member 5 shown in FIG. 1 is made of resin and is therefore lightweight. Therefore, by using the resin member 5, the weight of the pipe nipple fitting 1 can be reduced. Also, since the resin member 5 is made of resin, there is a high degree of freedom in the shape. Note that a metal collar or the like may be fitted into the screw hole 5a of the resin member 5.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to Figures 11 to 22. The second embodiment differs from the first embodiment in that a metal member 305 is used instead of the resin member 5. Note that the same components as those in the first embodiment described above are designated by the same reference numerals, and descriptions thereof will be omitted as appropriate.

As shown in Figures 11 and 12, the joint 301 with a pipe nipple according to the second embodiment includes a pipe nipple 2, a socket 304, and a metal member 305. A hose 10 is fastened to the joint 301 with a pipe nipple shown in Figures 11 and 12.

13(a) to (c) show the metal member 305. As shown in FIG. 13(a) to (c), the metal member 305 has a metal tube portion 305F, an intermediate portion 305G, and a bracket 305H. The metal tube portion 305F, the intermediate portion 305G, and the bracket 305H are integrally molded. The metal tube portion 305F and the intermediate portion 305G are connected so that the hole of the metal tube portion 305F communicates with the hole of the intermediate portion 305G. The bracket 305H is connected to the intermediate portion 305G. A screw hole 305a is formed in the bracket 305H. The metal member 305 is made of metal. Examples of the material of the metal member 305 include cold rolled steel plate (SPCC) and hot rolled steel plate (SPHC). Note that the material of the metal member 305 is not limited to these.

As shown in Figures 13(a) and 13(c), a plurality of recesses 305s, 305t, 305u, 305v, and 305w are formed on the outer surface of the metal tube portion 305F. The plurality of recesses 305s, 305t, 305u, 305v, and 305w are arranged at intervals in the circumferential direction of the socket 4.

Figure 14 shows a cross-sectional view of the fitting 301 with a pipe nipple. As shown in Figure 14, the metal tube portion 305F of the metal member 305 is disposed on the outside of the portion of the socket 304 that overlaps radially with the pipe main body 21. In the socket 304, the metal member 305 is not disposed on the outside of the hose overlap portion 4x. The bracket 305H is disposed on the opposite side of the hose overlap portion 4x to the pipe overlap portion 304y.

The metal tube portion 305F is fixed to the pipe overlap portion 304y by crimping toward the inside of the radial direction. This prevents the metal tube portion 305F from rotating.

The pipe overlap portion 304y is fixed to the pipe main body portion 21 by crimping toward the inside of the radial direction. This prevents the pipe nipple 2 from rotating.

The outer surface of the metal tube portion 305F is formed with recesses 305s, 305t, 305u, 305v, and 305w (see FIG. 12). They are spaced apart from each other in the circumferential direction of the metal tube portion 305F.

As shown in FIG. 15, a plurality of recesses 304A, 304B, 304C, 304D, and 304E are formed on the outer peripheral surface of the pipe overlapping portion 304y. The plurality of recesses 304A, 304B, 304C, 304D, and 304E are arranged at intervals in the circumferential direction of the socket 4. FIG. 15 shows the pipe nipple 2, the socket 304, and the hose 10, and omits the metal member 305.

The protrusions (see "protrusions 305A" in FIG. 14) formed on the metal tube portion 305F fit into each of the multiple recesses 304A, 304B, 304C, 304D, and 304E. This connects the metal tube portion 305F to the pipe overlap portion 304y of the socket 304.

Figure 14 shows the projection 305A fitted into the recess 304A, but the other recesses (such as recess 304B, recess 304C, recess 304D, and recess 304E shown in Figure 15) also have projections (not shown) formed on the metal tube 305F fitted into them. The same number of projections are formed on the metal tube 305F as there are recesses on the socket 304.

Next, a method for manufacturing the joint with pipe nipple 301 will be described with reference to FIGS.
In the above, the socket connected to the pipe nipple 2 is referred to as "socket 304", but below, the socket before being connected to the pipe nipple 2 is referred to as "socket 104", and the socket connected to the pipe nipple 2 is referred to as "socket 304" as above. In the following explanation of "socket 104", the same components as those in "socket 304" will be designated by the same reference numerals, and explanations thereof will be omitted as appropriate.
In addition, the metal member connected to the socket 304 is referred to as the "metal member 305," but hereinafter, the metal member before being connected to the socket 304 is referred to as the "metal member 405," and the metal member connected to the socket 304 is referred to as the "metal member 305." In the explanation of the "metal member 405," the same reference numerals are used for configurations that are the same as those in the "metal member 305," and explanations thereof will be omitted as appropriate.

As shown in FIG. 16, first, insert the pipe nipple 2 into the socket 104 from the pipe body portion 21, and bring the front surface 22a of the spool portion 22 into contact with the first wall portion 41 of the socket 104 (first step, see FIG. 17).

In this state, a jig or the like is used to apply an axial force to the third wall portion 143 of the socket 104. This causes a portion 143p of the third wall portion 143 to plastically deform, forming the second wall portion 42 (second step, see FIG. 18).

As shown in FIG. 18, the spool portion 22 is sandwiched between the first wall portion 41 and the second wall portion 42. The second wall portion 42 is crimped and fixed to the spool portion 22 in the axial direction of the socket 4. This connects the pipe nipple 2 and the socket 4.

Next, the tubular portion 405F of the metal member 405 is placed on the outside of the pipe overlap portion 304y of the socket 4 (third step, see FIG. 19). Then, the tubular portion 405F is pressed radially inward. As a result, as shown in FIG. 20, the metal tubular portion 305F is crimped and fixed to the socket 304 radially inward, and the socket 304 is crimped and fixed to the pipe body portion 21 of the pipe nipple 2 radially inward. In addition, recesses 305s, 305u, 305v, and 305w are formed on the outer surface of the metal tubular portion 305F. A recess 304A is formed in the pipe overlap portion 304y, and a protrusion 305A fitted into the recess 304A is formed on the inner surface of the metal tubular portion 305F (third step). Although not shown in FIG. 20, other recesses (e.g., recesses 305t and 305u shown in FIG. 13(c)) are also formed on the outer surface of metal tube portion 305F. Other recesses (e.g., recesses 304B, 304C, 304D, and 304E shown in FIG. 15) are formed in socket 304, and protrusions (not shown) that fit into these recesses are formed on the inner surface of metal tube portion 305F.

When connecting the hose 10 to the fitting 301 with a pipe nipple, as shown in FIG. 21, the hose 10 is inserted between the socket 304 and the nipple portion 23. As shown in FIG. 22, the hose 10 is fastened to the fitting 301 with a pipe nipple by radially pressing the hose overlap portion 4x of the socket 304 (see FIG. 14).

According to the joint 301 with a pipe nipple according to the second embodiment, as shown in Fig. 14, the metal tube portion 305F is crimped and fixed to the pipe overlapping portion 304y of the socket 304 toward the radial inside, and the socket 4 is crimped and fixed to the pipe main body portion 21 toward the radial inside. A recess 304A is formed on the outer circumferential surface of the pipe overlapping portion 304y, and the protrusion 305A of the metal member 305 is fitted into this recess 304A. This suppresses the rotation of the metal tube portion 305F and the rotation of the pipe nipple 2. For example, when a force in a rotational direction is applied to the metal member 305, the protrusions of the metal tube portion 305F are caught in the recesses of the socket 304, suppressing the rotation of the metal member 305.
As described above, according to the joint 301 with a pipe nipple of the second embodiment, rotation of the pipe nipple 2 and rotation of the metal member 305 can be suppressed.

In addition, as shown in FIG. 14, the pipe nipple 2 is an integrated member of the pipe body 21, spool 22, and nipple 23, so the number of parts is smaller than when the pipe nipple 2 is composed of two or more separate members. In addition, the number of manufacturing steps for the pipe nipple fitting 1 can be reduced, and it is easy to assemble. Furthermore, since the pipe nipple 2 is composed of a single member, there is no risk of leakage of the liquid flowing through the pipe nipple 2, compared to when the pipe nipple 2 is composed of two or more separate members that are adjacent to each other.

In addition, according to the manufacturing method of the fitting with pipe nipple 301 of the second embodiment, the tubular portion 405F of the metal member 405 is placed outside the pipe overlap portion 304y of the socket 4, and by pressing the pipe overlap portion 304y, the metal tubular portion 305F and the socket 4 can be crimped and fixed simultaneously. This simplifies the manufacturing process and reduces the number of manufacturing steps.

In addition, according to the manufacturing method of the joint with pipe nipple 301 of the second embodiment, the cylindrical portion 405F of the metal member 405 is pressed radially inward (see FIG. 19), so that, as shown in FIG. 20, there is almost no gap between the convex portion 305A of the metal cylindrical portion 305F and the wall portion defining the concave portion 304A of the socket 304. Therefore, the convex portion 305A of the metal cylindrical portion 305F hardly moves in the concave portion 304A of the socket 304. As a result, even if a force in a rotational direction and/or a force along the axial direction of the socket 4 is applied to the metal member 305, the metal member 305 hardly moves.

As shown in FIG. 15, a plurality of recesses 304A, 304B, 304C, 304D, and 304E are formed in the pipe overlap portion 304y of the socket 304. The plurality of recesses 304A, 304B, 304C, 304D, and 304E are arranged at intervals in the circumferential direction of the socket 304. The protruding portions of the metal member 305 fit into the plurality of recesses 304A, 304B, 304C, 304D, and 304E, respectively, so that the metal member 305 is caught by the socket 304 at a plurality of points in the circumferential direction of the socket 304. This makes it more difficult for the metal member 305 to rotate.

As shown in FIG. 14, the metal tube portion 305F of the metal member 305 is disposed on the outside of the portion (pipe overlap portion 304y) that overlaps radially with the pipe main body 21 in the socket 304. In the socket 304, the metal tube portion 305F is not disposed on the outside of the hose overlap portion 4x. In other words, there is an area in the hose overlap portion 4x that can be pressed from the radial outside. By pressing this area radially inward, the hose 10 can be fastened to the pipe nipple fitting 301.

The bracket 305H of the metal member 305 shown in Figures 13(a) to (c) and Figure 14 may be screwed to an automobile part or the like. At this time, a screw is inserted into the screw hole 305a, but since the metal member 305 is made of metal, the area around the screw hole 305a is not prone to creep. Therefore, the screw is not prone to loosening. A separate part such as a metal collar may be inserted into the screw hole 305a to prevent the screw from loosening, but when the metal member 305 is used, the screw is not prone to loosening, so a separate part such as a metal collar is not necessary.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration should not be considered to be limited to these embodiments. The scope of the present invention is indicated by the claims, not the above description, and includes all modifications within the meaning and scope of the claims.

For example, in the first embodiment, multiple recesses 4A, 4B, and 4C are formed in the pipe overlapping portion 4y of the socket 4. Also, in the second embodiment, multiple recesses 304A, 304B, 304C, 304D, and 304E are formed in the pipe overlapping portion 4y of the socket 304. However, the number of recesses can be changed. One, two, or three recesses may be formed in the pipe overlapping portion 4y, or four or more recesses may be formed.

In addition, in the first embodiment, the multiple protrusions of the resin member 5 fit into each of the multiple recesses 4A, 4B, and 4C of the socket 4. The resin member 5 has the same number of protrusions as the recesses of the socket 4. However, the number of protrusions formed on the resin member may be less than the number of recesses formed on the socket, and the protrusions of the resin member do not have to fit into all of the multiple recesses formed on the socket.

In addition, in the first embodiment, the multiple recesses 4A, 4B, and 4C formed in the socket 4 are arranged at intervals in the circumferential direction of the socket 4. In the second embodiment, the multiple recesses 304A, 304B, 304C, 304D, and 304E formed in the socket 304 are arranged at intervals in the circumferential direction of the socket 304. However, the multiple recesses formed in the socket may be arranged at intervals in the circumferential and/or axial direction of the socket.

In the first embodiment, the resin member 5 is disposed on the outside of a portion of the socket 4 that overlaps radially with the pipe main body 21, on the outside of a portion of the socket 4 that overlaps radially with the spool portion 22, and on the outside of a portion of the socket 4 that overlaps radially with the second wall portion 42. In the second embodiment, the metal tube portion 305F of the metal member 305 is disposed on the outside of a portion of the socket 4 that overlaps radially with the pipe main body 21.
However, the resin member may be disposed only outside the portion radially overlapping with the pipe main body 21. The resin member and the metal member may be disposed only outside the portion radially overlapping with the pipe main body 21 and outside the portion radially overlapping with the spool portion 22. The metal tube portion of the metal member may be disposed in the socket outside the portion radially overlapping with the pipe main body 21, outside the portion radially overlapping with the spool portion 22, and outside the portion radially overlapping with the second wall portion 42. The resin member and the metal member may be disposed outside the hose overlapping portion 4x.

In the first embodiment, the method of producing the resin member 5 by insert molding has been described. However, the resin member may be produced by another method.

In addition, in the first embodiment, when the resin member 5 is manufactured, the recess 4A of the socket 4 is filled with the molten resin material 105, and the resin material 105 is solidified to form the protrusion 5A of the resin member 5. However, the method for forming the protrusion of the resin member may be different.

In the second embodiment, as shown in Figs. 13(a) to (c), the metal tube portion 305F, the intermediate portion 305G, and the bracket 305H are integrally molded. However, the metal tube portion 305F, the intermediate portion 305G, and the bracket 305H may each be different members, and each member may be connected to another member by welding or the like. In this case, the metal member 305 is made up of three members. Also, the intermediate portion 305G may not be present, and the metal tube portion 305F and the bracket 305H may be integrally molded. Also, the metal tube portion 305F and the bracket 305H may be different members, and these may be connected by welding or the like. The shapes of the metal tube portion 305F, the intermediate portion 305G, and the bracket 305H are not limited to the shapes shown in Figs. 13(a) to (c).

In the second embodiment, the metal member 305 has the metal tube portion 305F, the middle portion 305G, and the bracket 305H. However, the metal member 305 may have the metal tube portion 305F and the bracket 305H, but may not have the middle portion 305G.

In the first and second embodiments, the outer and inner diameters of the pipe body 21 in the pipe nipple 2 are larger than the outer and inner diameters of the nipple portion 23, respectively. However, the outer and inner diameters of the pipe body 21 may be the same as the outer and inner diameters of the nipple portion, respectively. The outer and inner diameters of the pipe body 21 may be smaller than the outer and inner diameters of the nipple portion, respectively.

LIST OF SYMBOLS 1, 301 Pipe nipple fitting 2 Pipe nipple 4, 104, 304, 404 Socket 4A, 4B, 4C, 404A, 404B, 404C, 404D, 404E Recess 4x Hose overlapping portion 4y, 304y Pipe overlapping portion 5 Resin member 5A Convex portion 10 Hose 21 Pipe main body portion 22 Spool portion 23 Nipple portion 41 First wall portion 42 Second wall portion 105 Resin material 200 Mold 305 Metal member 305A Recess 305F Metal tube portion 305G Intermediate portion 305H Bracket 305s, 305t, 305u, 305v, 305w Recess 405 Metal member 405F Cylinder portion

Claims (4)

A cylindrical pipe nipple,
a cylindrical socket having the pipe nipple disposed therein;
a resin member or a metal member disposed on the outside of the socket;
Equipped with
The pipe nipple is
A pipe body;
A nipple portion,
a spool portion formed between the pipe body portion and the nipple portion, the spool portion having a diameter larger than an outer diameter of the pipe body portion and an outer diameter of the nipple portion;
having
The socket is
a first wall portion and a second wall portion disposed on either side of the spool portion in an axial direction of the socket;
In the socket, a portion that radially overlaps with the pipe body is crimped and fixed to the pipe body toward the radial inside, thereby forming a recess on an outer peripheral surface of the socket,
A fitting with a pipe nipple, characterized in that the resin member or the metal member has a convex portion that fits into the concave portion. The socket is formed with a plurality of the recesses,
The recesses are arranged at intervals in a circumferential direction of the socket,
2. A joint with a pipe nipple according to claim 1, wherein the resin member or the metal member is formed with a plurality of protrusions each fitted into a plurality of recesses. A method for manufacturing a fitting with a pipe nipple, the fitting comprising: a pipe nipple having a pipe main body portion, a nipple portion, and a spool portion formed therebetween; a socket with the pipe nipple disposed inside; and a metal member disposed outside the socket,
a first step of placing the pipe nipple inside the socket;
a second step of plastically deforming a wall portion of the socket on an opposite side of the spool portion from the pipe body by pressing the wall portion toward the spool portion;
a third step of forming a metal member having a metal tubular portion on the outside of a portion of the socket that overlaps with the pipe body in the radial direction, and then pressing the tubular portion radially inward to swage and fix the portion of the socket that overlaps with the pipe body in the radial direction to the pipe body, forming a recess on an outer peripheral surface of the socket, and forming a metal member having a metal tubular portion with a protrusion that fits into the recess;
A method for manufacturing a fitting with a pipe nipple, comprising: A method for manufacturing a fitting with a pipe nipple, the fitting comprising: a pipe nipple having a pipe main body portion, a nipple portion, and a spool portion formed therebetween; a socket with the pipe nipple disposed inside; and a resin member disposed outside the socket,
a first step of placing the pipe nipple inside the socket;
a second step of plastically deforming a wall portion of the socket on an opposite side of the spool portion from the pipe body by pressing the wall portion toward the spool portion;
a third step of crimping a portion of the socket that overlaps with the pipe body in the radial direction toward the inside of the pipe body to form a recess in an outer peripheral surface of the socket;
a fourth step of forming a resin member having a protrusion fitted into the recess by disposing the crimped portion of the socket in a mold, injecting a molten resin material into the mold, and solidifying the resin material in a state in which the recess is filled with the molten resin material;
A method for manufacturing a fitting with a pipe nipple, comprising:

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