JP2008089161A - Coupling and manufacturing method of coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent rotation of a tubular member in connecting instruments and the like at low cost, in a coupling connected with a hose at one end and an instrument at the other end. <P>SOLUTION: The coupling 10 comprises a hose connection portion 12 having a fastener 24 externally inserted at one end of a tubular member 12 and a connection portion 16 having a cap nut 22 connected at the other side of the tubular member 12. A rotation stopping portion 18, for pressing the tubular member 12 for preventing it from rotating together when an adapter 40 is connected to the nut cap 22, is provided in the section of the tubular member 12 located to the center side in relation to the connection member 16. The rotation stopping portion 18 consists of four plane portions 18A formed in a small diameter portion 16C of the tubular member 12 in the circumferential direction. The plane portions 18A are formed by press-working the tubular member 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a joint in which a hose is connected to one end and a coupling device is connected to the other end, and a method for manufacturing the joint.

  Conventionally, a joint in which a hose is connected to one end and an adapter (connector) is attached to the other end is used as a joint for transferring a fluid such as water or oil.

  In such a joint, a part for connecting a hose to one end of the core metal and a connection part for attaching a connecting tool to the other end of the core metal are integrally formed. The part to which the hose is connected is usually a caulking portion for caulking the hose.

As such a joint, a straight metal fitting is cut out from a hexagonal steel material or a round bar steel material using an NC processing machine, etc., and a crimping part for crimping a hose is formed at one end, and at the other end A connecting portion for attaching the counterpart coupling device is formed (see, for example, Patent Document 1).
JP 2006-118665 A

  As shown in FIG. 6, in the straight metal fitting 100, a fastener 108 for caulking the hose 112 is attached to one end side of the core metal piece 102, and a nut 110 is connected to a connecting portion 104 provided on the other end side of the core metal piece 102. Is installed. A hexagonal portion 106 is provided in the core metal 102 between the connecting portion 104 and the clamp 108 to hang a spanner when the coupling tool (not shown) is fastened to the nut 110 to prevent the core metal 102 from rotating. Is provided.

  In the straight metal fitting 100, as shown in FIG. 7, a core metal fitting 102 is manufactured by using a hexagonal steel material 120 and performing cutting by cutting. In this core metal fitting 102, the hexagonal portion 106 for hanging the spanner protrudes in the radial direction from the caulking portion 103 and the connecting portion 104 on both sides, so a large hexagonal steel material 120 is selected according to the outer shape of the hexagonal portion 106. Is done. For this reason, the machining allowance 122 of the hexagonal steel material 120 in the caulking part 103 and the connection part 104 becomes large, and it takes time for the cutting process, and the material cut out is wasted and the cost is increased.

  As shown in FIG. 8, there is a straight fitting 130 of a type in which a hexagonal portion is not provided on the center side of the connecting portion 104 of the core fitting 132. The straight metal fitting 130 can be manufactured by pressing the connecting portion 104 of the core metal fitting 132. However, since there is no hexagonal portion, the metal core fitting 132 is rotated when the nut 110 is screwed.

  Further, as a joint having another configuration, a vent fitting 140 as shown in FIG. 9 has a fastener 108 attached to one end of a core fitting 142 bent in a substantially L shape, and a connecting portion connected to the other end of the core fitting 142. 144. A hexagonal portion 146 for attaching a spanner is provided on the center side of the connecting portion 144 of the core metal 142. In such a vent fitting 140, the hexagonal portion 146 is welded to the core fitting 142 by brazing or the like, so that the cost is increased.

  As shown in FIG. 10, there is a vent fitting 150 of a type in which a hexagonal portion is not provided on the center side of the connection portion 154 of the core fitting 152 bent in a substantially L shape. The vent fitting 150 can be manufactured by pressing the connecting portion 154 of the core fitting 152. However, since there is no hexagonal portion, the core fitting 152 is rotated when the nut 110 is screwed.

  The present invention has been made in view of the above problems, and it is intended to provide a joint and a joint manufacturing method that can reduce the cost of the tubular member and reduce the cost when connecting a coupling tool or the like. Objective.

  In the joint according to the first aspect of the present invention, a hose connecting portion in which a hose is connected to one end of a metallic tubular member, and a fastener for connecting a connecting instrument to the other end of the tubular member are attached. A turn formed on the tubular member between the terminal part and the hose connecting part and the terminal part by pressing, and is pressed to prevent rotation when connecting the hose or the connecting device to the tubular member. And a stop portion.

  According to the joint according to the first aspect of the present invention, the hose is connected to the hose connection portion provided at one end of the metallic tubular member. A fastener is attached to a terminal portion at the other end of the tubular member, and a coupling tool is connected to the fastening portion. In addition, the tubular member between the hose connection part and the terminal part is formed with a rotation-stopping part by pressing, and when the hose or connecting device is connected to the tubular member by pressing the rotation-stopping part with a spanner, Circulation of the tubular member is prevented. In such a joint, since the rotation stop is formed by pressing, compared to the case where the entire joint is cut with one hexagonal steel material as in the past, or when the hexagonal part is manufactured by cutting, Material waste due to machining allowance can be reduced, and costs can be reduced. Further, the cost can be reduced as compared with the case where the hexagonal portion is provided by welding such as brazing.

  According to a second aspect of the present invention, in the joint according to the first aspect, the anti-rotation portion includes a plurality of flat portions formed in the circumferential direction of the tubular member.

  In the invention according to claim 2, the rotation stop portion includes a plurality of flat portions formed in the circumferential direction of the tubular member, and the plurality of flat portions can be easily manufactured on the peripheral surface of the tubular member by pressing. .

  According to a third aspect of the present invention, a hose is connected to a hose connecting portion provided at one end of a metal tubular member, and a fastener is attached to a terminal portion provided at the other end of the tubular member. A method for manufacturing a joint to be connected, wherein the tubular member between the hose connecting part and the terminal part is clamped to prevent the rotation when connecting the hose or the connecting device to the tubular member. For this purpose, there are provided a first step of pressing the rotation-stopping portion to be pressed and a second step of pressing the terminal portion while clamping the tubular member in the first step.

  In the invention according to claim 3, in the first step, the tubular member between the hose connecting portion and the terminal portion is clamped to prevent rotation when the hose or the connecting device is connected to the tubular member. Press the stop part to be pressed. Then, the terminal portion is pressed in the second step while the tubular member is clamped in the first step. Thereby, it is possible to easily manufacture the rotation-stopped portion by press working on the tubular member, compared to the case where the entire joint is manufactured by cutting with one hexagonal steel material, or when the hexagonal portion is formed by cutting, Material waste due to machining allowance can be reduced, and costs can be reduced. Further, the cost can be reduced as compared with the case where the hexagonal portion is provided by welding such as brazing.

  In the joint and the joint manufacturing method according to the present invention, the rotation stopper is formed on the tubular member by press working. Therefore, when the whole joint is manufactured by cutting with one hexagonal steel material, the hexagonal part is formed by cutting. Alternatively, the cost can be reduced as compared with the case where the hexagonal portion is welded by brazing or the like.

  Hereinafter, embodiments of the joint of the present invention will be described with reference to the drawings.

  FIG. 1 is a partially cutaway sectional view of a joint 10 according to the first embodiment of the present invention. Further, FIG. 5 shows a half-cut cross-sectional view in a state where the hose 30 is connected to one end of the joint 10 and the adapter 40 as a connecting device is connected to the other end.

  The joint 10 includes a hose connecting portion 14 at one end of a metallic tubular member 12 and a connecting portion 16 having a cap nut 22 attached to the other end of the tubular member 12. In addition, the tubular member 12 between the hose connection portion 14 and the connection portion 16 is provided with a rotation stop portion 18 having four flat surface portions 18A formed at substantially equal intervals in the circumferential direction. A cylindrical fastener 24 for caulking and connecting the hose 30 is attached to the hose connection portion 14. A circular opening 20 through which a fluid such as gas or liquid can flow is formed at the center of the tubular member 12.

  As shown in FIG. 5, a plurality of protrusions 15 that prevent the hose 30 from coming off are formed on the outer peripheral surface of the hose connection portion 14. The plurality of projecting portions 15 include a tapered surface 15A that is inclined obliquely upward in the insertion direction of the hose 30 (left direction in the figure), and the upper corner portion of the tapered surface 15A is substantially perpendicular to the axial direction. Standing up to. Thereby, the hose connection part 14 becomes a shape which is easy to insert the hose 30 and is hard to remove.

  A hose 30 is inserted into the outer peripheral surface of the hose connection portion 14, and a cylindrical fastener 24 is externally attached to cover the outside of the hose 30. The hose 30 is attached to the hose connection portion 14 by caulking the fastener 24 with a caulking machine (not shown).

  As shown in FIGS. 1 and 5, the connection portion 16 includes a sheet surface 16 </ b> A that is brought into contact with the end portion on the side opposite to the hose connection portion 14 when the adapter 40 is connected. The sheet surface 16A is an inclined surface that expands from the front end portion toward the center portion. Further, a large-diameter portion 16B is formed on the center side of the connecting portion 16 from the sheet surface 16A, and a small-diameter portion 16C is formed by providing a step at a position adjacent to the large-diameter portion 16B.

  Further, the hook-shaped one end portion 22 </ b> A of the cap nut 22 is coupled to the small diameter portion 16 </ b> C of the connection portion 16. The other end of the cap nut 22 protrudes from the seat surface 16 </ b> A of the connecting portion 16, and a screw portion 23 is formed on the inner peripheral surface of the cap nut 22.

  As shown in FIGS. 1 (A) and 1 (B), the rotation stopper 18 includes a concave flat surface portion 18A formed by pressing the peripheral surface of the small diameter portion 16C of the tubular member 12, and is flat. The portion 18A has a shape in which a part of the peripheral surface is cut out. Four flat portions 18A are formed at substantially equal intervals (positions of approximately 90 °) along the peripheral surface of the small diameter portion 16C (four surfaces). The rotation stopper 18 is used to prevent the tubular member 12 from being turned around with a spanner or the like when the hose 30 is connected or when the adapter 40 (see FIG. 5) is fastened and fixed to the cap nut 22. It is done.

  Here, a method of forming the rotation stopper 18 in the tubular member 12 will be described. As shown in FIG. 2, by holding the tubular body 50 with a clamp 52 and pressing the tubular body 50, four flat portions 18 </ b> A are formed at a position of about 90 ° on the peripheral surface of the tubular body 50. As a result, the rotation stopper 18 including the four planar portions 18A is formed in the tubular body 50. Thereafter, while holding the tubular body 50 with the clamp 52, the punch 54 having the concave portion 54A having a shape corresponding to the connecting portion 16 (see FIG. 1) is abutted to press the end portion of the tubular body 50. Thus, the sheet surface 16A and the large diameter portion 16B are formed at the terminal portion of the tubular body 50. Furthermore, the tubular member 12 is obtained by forming the hose connection portion 14 in the tubular body 50.

  Next, the use state of the joint 10 will be described.

  As shown in FIG. 5, the hose 30 is inserted into the outer peripheral surface of the hose connection portion 14 of the tubular member 12, and the cylindrical fastener 24 inserted outside the hose 30 is crimped by a crimping machine (not shown). Thus, the hose 30 is attached to the hose connection portion 14. When the hose 30 is inserted into the hose connection portion 14, a twist or the like when the hose 30 is attached is prevented by applying a spanner or the like to the rotation stop portion 18 to press the rotation stop portion 18.

  One end of the adapter 40 is provided with a tapered contact portion 40A whose inner peripheral surface is enlarged as it goes to the tip, and this contact portion 40A is in contact with the seat surface 16A of the joint 10. A screw portion 42 is provided at one end portion of the outer peripheral surface of the adapter 40, and a fixed hexagonal portion 40 </ b> B for hanging a spanner is provided near the center portion of the adapter 40. The other end of the adapter 40 is provided with a screw portion 43 for connection to other piping (not shown).

  When connecting the adapter 40, the screw portion 42 of the adapter 40 is screwed into the screw portion 23 of the cap nut 22. At that time, the screw part 42 of the adapter 40 is screwed to the screw part 23 of the cap nut 22 while pressing the rotation stopper 18 with a spanner or the like, thereby preventing the tubular member 12 from rotating. It is attached to the joint 10. Further, another pipe (not shown) is connected to the screw portion 43 of the adapter 40. In this state, it becomes possible to flow a fluid through the opening 20 of the joint 10.

  In the joint 10 as described above, the rotation stop portion 18 in which the flat portion 18A is formed by press working is provided on the peripheral surface of the tubular member 12, and therefore the entire joint is manufactured by cutting with one steel material (FIG. Compared to 7), the waste of the material by cutting the machining allowance is reduced, and the manufacturing is simple. Moreover, manufacture is simple compared with the case where a hexagonal part is provided on the metal core by welding (see FIG. 9). For this reason, cost reduction can be realized.

  Next, a second embodiment of the joint of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 3, the joint 60 is a straight metal fitting, and a rotation stop portion 64 is formed closer to the center than the connection portion 16 of the tubular member 62. The anti-rotation portion 64 includes two flat surface portions 64A formed on both sides (180 ° position) of the peripheral surface of the tubular member 62 (two surfaces). As in FIG. 2, the two flat portions 64 </ b> A are formed by pressing the peripheral surface of the tubular body 50 from a direction of 180 ° when the tubular body 50 is held by the clamp 52.

  In such a joint 60, since the rotation stop part 64 which formed the two plane parts 64A by press work was provided in the surrounding surface of the tubular member 62, when manufacturing the whole joint by cutting with one steel material ( Compared with FIG. 7), the waste of the material due to the cutting allowance is reduced, and the manufacturing is further simplified. Moreover, manufacture is simple compared with the case where a hexagonal part is provided on the metal core by welding (see FIG. 9). Thereby, cost reduction can be realized.

  Next, a third embodiment of the joint of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as 1st or 2nd embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 3, the joint 70 is a bent metal fitting, and a rotation stopper 74 is formed on the center side of the connection portion 16 of the tubular member 72 curved in a substantially L shape. The anti-rotation portion 74 includes four plane portions 74 </ b> A formed on four sides (90 ° intervals) of the circumferential surface of the tubular member 72. Similar to FIG. 2, these flat portions 74 </ b> A are formed by pressing the peripheral surface of the tubular body 50 when the tubular body 50 is held by the clamp 52.

  In such a joint 70, since the rotation stop part 74 which formed the four plane parts 74A by press work is provided in the surrounding surface of the tubular member 72, when manufacturing the whole joint by cutting with one steel material ( Compared to FIG. 7), the waste of material due to cutting out the cutting allowance is reduced, and the manufacturing is simple. Moreover, manufacture is simple compared with the case where a hexagonal part is provided on the metal core by welding (see FIG. 9). Thereby, cost reduction can be realized.

  Note that the number, shape, or size of the planar portion provided in the rotation stop portion is not limited to the above-described embodiment, and other configurations are possible as long as the shape can be pressed with a spanner or the like. Moreover, the diameter and magnitude | size of the hose connection part 14 and the connection part 16 are not limited to the structure of the said embodiment, It is also possible to use the hose connection part and connection part from which a dimension differs.

  In the above-described embodiment, the adapter 40 is fastened and fixed to the connection portion 16 of the joint 10 using the cap nut 22. However, the present invention is not limited to this configuration, and a connection device such as an adapter is directly tightened and fixed to the connection portion. But you can.

It is a figure which shows the coupling which concerns on 1st Embodiment of this invention, Comprising: (A) is sectional drawing of a rotation stop part, (B) is a partial half-cut sectional view of a coupling. It is a figure explaining the process of forming a connection part and a rotation stop part in the tubular member shown in FIG. It is a figure which shows the coupling which concerns on 2nd Embodiment of this invention, Comprising: (A) is sectional drawing of a rotation stop part, (B) is a partial half-cut sectional view of a coupling. It is a figure which shows the coupling which concerns on 3rd Embodiment of this invention, Comprising: (A) is sectional drawing of a rotation stop part, (B) is a partial half-cut sectional view of a coupling. It is a half-cut sectional view which shows the state which connected the hose to the end of the coupling shown in FIG. 1, and connected the adapter to the other end. It is a partially half cut sectional view which shows an example of the straight metal fitting which is the conventional coupling. It is a figure which shows the manufacturing method of the tubular member of the coupling shown in FIG. It is a partially half cut sectional view which shows the other example of the straight metal fitting which is the conventional coupling. It is a partially half cut sectional view which shows an example of the vent metal fitting which is the conventional coupling. It is a partially half cut sectional view which shows the other example of the vent metal fitting which is the conventional coupling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Joint 12 Tubular member 14 Hose connection part 15 Protrusion part 16 Connection part (terminal part)
18 Stopping part 18A Flat part 20 Opening part 22 Cap nut (fastener)
24 Fastener 30 Hose 40 Adapter (Connector)
60 Joint 62 Tubular member 64 Stop part 64A Plane part 70 Joint 72 Tubular member 74 Stop part 74A Plane part

Claims (3)

A hose connection part to which a hose is connected to one end of a metallic tubular member;
A terminal portion to which a fastener for connecting a connecting device is attached to the other end of the tubular member;
A non-rotating portion formed by pressing the tubular member between the hose connecting portion and the terminal portion, and holding the hose or the connecting device in order to prevent rotation when connecting the connecting member to the tubular member;
A joint characterized by comprising:   The joint according to claim 1, wherein the rotation stopper includes a plurality of flat portions formed in a circumferential direction of the tubular member. A method for manufacturing a joint in which a hose is connected to a hose connecting portion provided at one end of a metallic tubular member, and a connecting tool is connected by attaching a fastener to a terminal portion provided at the other end of the tubular member. ,
Clamping the tubular member between the hose connecting portion and the terminal portion, and press-working a non-rotating portion for holding the hose or the connecting device to prevent rotation when connecting the tubular member to the tubular member The first step;
A second step of pressing the terminal portion while clamping the tubular member in the first step;
A method for manufacturing a joint, comprising:

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