JP6518538B2 - Core member and pipe joint - Google Patents

Description

  The present invention relates to a core member and a pipe joint.

  Conventionally, a structure has been proposed in which a tubular body holding portion for holding the tubular body on one end side in the axial direction of the pipe fitting and a mounting portion for attaching to a device etc. on the other end side in the axial direction of the pipe fitting .

  In Patent Document 1 below, a nut to be screwed to the joint body, a pressing ring disposed on the inner side of the nut, and a pressing ring disposed on the inner side of the pressing ring as a tube body holding portion on one end side in the axial direction of the joint body A tube fitting is disclosed comprising a split ring and a core sandwiching the tube between the split ring. In this pipe joint, a pipe body is inserted between the core portion and the split ring, and the nut is tightened on the joint body to slide the pressing ring to reduce the diameter of the split ring. Thus, the pipe is sandwiched between the split ring and the core, and the pipe is held by the pipe joint. Further, on the other end side in the axial direction of the joint body, a male screw portion (attachment portion) for attaching the pipe joint to a device or a connection member is provided.

JP, 2010-255775, A

  In the pipe joint described in Patent Document 1, the pipe body holding portion for holding the pipe body and the mounting portion for mounting to the device or the connection member are independent of each other, and there are parts necessary for each, and the number of parts is Become more. For this reason, the material cost is increased, and the number of manufacturing steps of the pipe joint is also increased. In addition, it is necessary to fasten a nut to the male thread of the fitting body in order to attach the tube to the tubular body holding part, and to fasten the male thread to the connection in order to attach it to equipment etc. Work efficiency is reduced.

  This invention is made in view of the said problem, and it aims at providing the core member and tube fitting which can improve the workability by the fastening of a fastening jig.

  In order to solve the above-mentioned problems, the core member according to the invention of claim 1 has an annular bottom portion which is disposed radially outward and which is curved in an axial concave direction, and an inner peripheral side of the bottom portion. And a plurality of convex portions disposed on the side opposite to the protruding portion of the bottom portion, the tip end side being configured to be able to expand in diameter, and provided on the outer periphery of the tip portion, The body has a projection hooked from the inside, and when it is fastened by a fastening jig, the protruding part of the bottom is bent to the outer peripheral side while being pushed by the fastening jig, and the diameter of the tip is enlarged. The projection hooks and fixes the tube from the inside.

  According to the first aspect of the present invention, the core member is disposed radially outward and extends in the axial direction from the inner peripheral side of the bottom portion and an annular bottom portion which is concavely curved in the axial direction. And a plurality of convex portions disposed on the opposite side of the protrusion of the bottom portion. When the core member is tightened by the fastening jig, the core member is pushed by the fastening jig and the protruding portion of the bottom portion bends toward the outer peripheral side, and the diameter of the tip end portion of the convex portion is expanded. Thus, the tubular body is fixed by hooking the tubular body from the inside by the projections provided on the outer periphery of the distal end portion of the convex portion. For this reason, a pipe body can be fixed by one tightening of a fastening jig, and workability by tightening of a fastening jig can be improved.

  According to a second aspect of the present invention, in the core member according to the first aspect, the peripheral portion of the bottom portion is provided with a plurality of notches cut inward in the radial direction.

  According to the second aspect of the present invention, since the peripheral portion of the bottom portion is provided with a plurality of notches cut inward in the radial direction, the core member when fastened by the fastening jig The protruding portion at the bottom of the case is easily bent to the outer peripheral side. This makes it possible to expand the diameter of the tip end of the convex portion more reliably along with the deformation of the protruding portion of the bottom.

  According to a third aspect of the present invention, in the core member according to the first or second aspect, the bottom portion, the plurality of convex portions, and the protrusions are integrally formed of metal.

  According to the third aspect of the present invention, the bottom portion, the plurality of convex portions, and the protrusion portion are integrally formed of metal, and therefore, when the fastening jig is used, the protruding portion of the bottom portion is on the outer peripheral side. It becomes easy to bend. This makes it possible to expand the diameter of the tip end of the convex portion more reliably along with the deformation of the protruding portion of the bottom.

  The pipe joint according to the invention described in claim 4 is disposed so as to surround the core member according to any one of claims 1 to 3 and the bottom portion of the core member, and the fastening jig Provided between the nut constituting the first member, the nut and the plurality of convex portions of the core member, and the concave insertion portion into which the tubular body is inserted, and the nut, which protrudes radially inward And a wall portion which pushes the bottom portion from the opposite side of the protruding portion when the nut is fastened to the male screw portion of the other connection member.

  According to the invention described in claim 4, in the pipe joint, the pipe body is inserted between the core member, the nut arranged to surround the bottom of the core member, the nut and the plurality of convex portions. And a concave insertion portion. With the tube inserted in the concave insertion portion, when the nut is fastened to the male screw portion of the other connection member, the wall portion protruding inward in the radial direction of the nut protrudes from the bottom portion of the core member. By pressing from the opposite side, the protrusion of the bottom bends to the outer peripheral side. As a result, the diameter of the tip end of the plurality of convex portions is expanded along with the deformation of the protrusion of the bottom, and the protrusion provided on the outer periphery of the tip hooks the tube from the inside, thereby fixing the tube. Ru. In this pipe joint, the number of parts can be reduced as compared with a configuration in which a pipe body holding portion for holding a pipe body and a mounting portion for mounting to another connection member are provided independently. Furthermore, as compared with a configuration in which the tube body holding portion for holding the tube body and the attachment portion for attaching to the other connection member are provided independently, by one tightening of the nut to the male screw portion, The tube body can be fixed, and the workability by tightening a fastening jig (nut or the like) can be improved.

  The invention according to claim 5 is the pipe joint according to claim 4, wherein, when the nut is fastened to the inside of the nut on the opposite side of the bottom with respect to the wall, the nut is fastened to the male screw. A sealing member is provided which is sandwiched between the wall and the end face of the male screw through the bottom.

  According to the fifth aspect of the present invention, the seal member is provided inside the nut on the side opposite to the wall portion with respect to the bottom portion of the core member. Thus, when the nut is fastened to the male screw, the seal member is sandwiched between the wall of the nut and the end face of the male screw through the bottom of the core member, and the nut of the pipe joint and the other connection member Is sealed.

  The invention according to claim 6 is the pipe joint according to claim 4 or 5, wherein the outer periphery of the pipe body is inserted in the concave insertion portion on the inner peripheral side of the nut. An O-ring is provided in contact with the surface.

  According to the invention as set forth in claim 6, an O-ring is provided on the inner peripheral side of the nut in contact with the outer peripheral surface of the tubular body in a state where the tubular body is inserted in the concave insertion portion. The fitting nut and the tube are sealed.

  According to the core member and the pipe joint of the present invention, the workability by tightening the fastening jig can be improved.

(A) is a cross-sectional view showing a pipe joint provided with a core member according to an embodiment of the present invention, and (B) is a perspective view showing a pipe joint provided with a core member according to an embodiment of the present invention FIG. It is sectional drawing which shows the process in which the nut provided in the pipe joint shown in FIG. 1 is fastened by the external thread part of an apparatus. It is a perspective view which shows the core member provided in the pipe joint shown in FIG. It is sectional drawing which shows the state with which the nut provided in the pipe joint shown in FIG. 1 was fastened by the external thread part of an apparatus. It is a core member provided in the pipe joint shown in Drawing 4, and is a perspective view showing the state where the tip part side of a plurality of convex sections expanded diameter. It is a half cut sectional view which shows the pipe joint of a comparative example.

  Hereinafter, embodiments of the present invention will be described based on the drawings.

  FIG. 1A is a cross-sectional view of a pipe joint provided with a core member according to an embodiment of the present invention, and FIG. 1B shows a core according to an embodiment of the present invention. A fitting with a member is shown in a perspective view. Also, FIG. 3 shows a core member (single body) in a perspective view. As shown in FIGS. 1A and 1B, the pipe joint 10 includes a nut 12 as a fastening jig, and a core member 14 in which a part in the axial direction is disposed on the inner peripheral side of the nut 12; Is equipped. Furthermore, the pipe joint 10 includes a packing 16 as a seal member disposed inside the nut 12 and adjacent to the core member 14.

  As shown in FIGS. 1A and 3, the core member 14 has an annular bottom portion 20 disposed radially outward at one end in the axial direction, and a substantially axial direction from the inner peripheral side of the bottom portion 20. And a plurality of convex portions 22 extending toward the end. The bottom portion 20 is provided with a protruding portion 20A having a curved surface that is concavely curved in the axial direction. The protruding portion 20A is formed by curving a thin plate material that constitutes the bottom portion 20.

  The peripheral portion of the bottom portion 20 is provided with a plurality of cut portions 20B cut inward in the radial direction. The cut portion 20 </ b> B is formed in a substantially U shape in the axial direction of the core member 14. The notches 20B are arranged at substantially equal intervals in the circumferential direction of the bottom 20. The bottom portion 20 is provided with a plurality of cut portions 20B so that when the bottom portion 20 is axially pressed from the side opposite to the protruding portion 20A (opposite to the protruding direction), the protruding portion 20A bends toward the outer peripheral side It is considered to be deformable. In other words, deformation is possible in a direction in which the protruding portion 20A is bent back (including a state in which the protruding portion 20A is substantially planar).

  The plurality of convex portions 22 extend from the inner peripheral side of the bottom portion 20 to the opposite side of the protruding portion 20A of the bottom portion 20 (arranged), and the tip 22A side of the convex portion 22 (the opposite side to the bottom portion 20) ) Can be expanded. The plurality of convex portions 22 are disposed at substantially equal intervals along the circumferential direction on the inner peripheral side of the bottom portion 20, and slits 24 are formed between the adjacent convex portions 22. In other words, the plurality of convex portions 22 are divided pieces into a plurality of pieces by providing the plurality of slits 24 in the axial direction in the cylindrical body. The slits 24 are formed such that the width in the circumferential direction on the bottom 20 side is larger than the width in the circumferential direction on the tip 22 A side of the convex portion 22.

  The plurality of convex portions 22 are extended from the most protruding portion of the protruding portion 20A of the bottom portion 20. When the nut 12 is fastened to the male screw 52 (refer to FIG. 4) of the device 50 described later, the core member 14 bends the protruding portion 20A of the bottom 20 toward the outer peripheral side. The diameter of the portion 22A is enlarged (see FIG. 5). In other words, the distal end portion 22A of the plurality of convex portions 22 is expanded in diameter by being deformed in a direction in which the protruding portion 20A of the bottom portion 20 is warped (including a state in which the protruding portion 20A is substantially planar). There is.

  On the outer periphery of the tip end portion 22A of the convex portion 22, a protrusion 26 projecting outward in the radial direction is provided. The protrusion 26 has an inclined surface 26A which is inclined radially outward (so that the outer diameter is increased) from the axial tip end of the convex portion 22 toward the axial intermediate portion, and a radius from the outer end of the inclined surface 26A. And a step portion 26B which is disposed inward in the direction to form a step with the outer peripheral surface of the convex portion 22. When the nut 12 is fastened to the male screw 52 (refer to FIG. 4) of the device 50, the diameter of the tips 22A of the plurality of convex portions 22 is increased, so that the protrusion 26 becomes a hose 44 as a tube. It is configured to be hooked from the inside, that is, hook the hose 44 from inside to fix it (see FIG. 4).

  The core member 14 is made of metal. That is, the bottom portion 20, the plurality of convex portions 22 and the protrusions 26 are integrally formed of metal.

  As shown in FIG. 1A, the nut 12 has a tubular shape, and is provided with a female screw 30 on the inner periphery of one end 12A in the axial direction. The female screw portion 30 of the nut 12 is screwed to the male screw portion 52 provided on the connecting portion 50A of the device 50 as another connecting member (see FIG. 4). The bottom 20 side of the core member 14 is inserted into the other axial end 12 B of the nut 12. In other words, the axial other end 12 B side of the nut 12 is disposed so as to surround the bottom 20 side of the core member 14. In a side view of the pipe joint 10, the tip end 22A side of the convex portion 22 of the core member 14 is exposed axially outward from the other end 12B of the nut 12 (see FIG. 1B).

  As described above, an annular packing 16 is fitted on the inner peripheral side of the nut 12 at a position adjacent to the bottom 20 of the core member 14. The packing 16 has a substantially rectangular outer shape in a cross-sectional view along the axial direction. The packing 16 is fitted to the one end 12 </ b> A of the nut 12 in the axial direction with respect to the bottom 20 of the core member 14. The outer diameter of the packing 16 is formed to be slightly smaller than the inner diameter of the nut 12, and the packing 16 is pushed by the end face of the male screw 52 of the device 50 to be movable in the axial direction of the nut 12 (FIG. 4) reference). The packing 16 is made of rubber.

  On the other end 12 </ b> B side of the nut 12, a wall 32 that protrudes radially inward is provided. The other end 12 </ b> B side of the axial wall 32 of the nut 12 is an inner circumferential surface 34 axially arranged from the radially inner end of the wall 32. The inner diameter of the inner circumferential surface 34 is set smaller than the inner diameter of the thread of the female screw 30. Further, the outer diameter of the bottom portion 20 of the core member 14 is set larger than the inner diameter of the inner circumferential surface 34, and the bottom portion 20 of the core member 14 is in the axial direction than the inner circumferential surface 34 of the nut 12 and the wall portion 32. It is arrange | positioned at the one end part 12A side of. The packing 16 is disposed on the opposite side of the wall 32 to the bottom 20 of the core member 14 and is disposed on the protruding side of the protruding portion 20A of the bottom 20.

  The wall portion 32 of the nut 12 axially pushes the bottom portion 20 of the core member 14 from the side opposite to the protruding portion 20A when the nut 12 is fastened to the male screw portion 52 (see FIG. 4) of the device 50 Push in the direction of the dent). More specifically, the packing 16 disposed inside the nut 12 is an end face of the wall portion 32 and the male screw portion 52 via the bottom portion 20 of the core member 14 when the nut 12 is fastened to the male screw portion 52 of the device 50 It is supposed to be sandwiched between At that time, the bottom portion 20 of the core member 14 and the packing 16 are pinched between the wall portion 32 of the nut 12 and the end surface of the male screw portion 52 of the device 50 so that the protruding portion 20A of the bottom portion 20 bends outward. There is. In other words, the protruding portion 20A is deformed in a direction in which the protruding portion 20A bends (including a state in which the protruding portion 20A is substantially planar) (see FIG. 4).

  The nut 12 is formed in a substantially hexagonal shape as viewed in the axial direction, and can be fixed by hooking a spanner (not shown) when the nut 12 is screwed to the male screw portion 52 of the device 50.

  A concave groove 36 recessed outward in the radial direction along the circumferential direction is formed on the inner peripheral surface 34 of the nut 12, and an O-ring 38 is fitted in the groove 36. The O-ring 38 is made of, for example, rubber.

  As shown in FIG. 1A, in the state where no external force acts on the bottom portion 20 of the core member 14, the pipe joint 10 is in a normal state in which the tip portions 22A of the plurality of convex portions 22 do not expand in diameter. There is. In this state, the pipe joint 10 is provided with a concave insertion portion 40 into which the hose 44 (see FIG. 2) is inserted between the other end 12 B of the nut 12 and the plurality of convex portions 22 of the core member 14. It is done. The outer diameter of the hose 44 is set slightly smaller than the inner diameter of the inner circumferential surface 34 of the nut 12. Further, in a state in which no external force acts on the bottom portion 20 of the core member 14 (a normal state in which the distal end portion 22A of the plurality of convex portions 22 does not expand), the inside diameter of the hose 44 is the distal end portion of the plurality of convex portions 22 The diameter is set to be larger than the outer diameter on the 22A side (the outer diameter of the protrusion 26). Thus, the hose 44 can be inserted into the concave insertion portion 40 of the pipe joint 10.

  The O-ring 38 fitted in the groove portion 36 of the nut 12 contacts the outer peripheral surface of the hose 44 in a state where the hose 44 is inserted into the concave insertion portion 40 of the pipe joint 10 and seals the hose 44 and the nut 12 It is supposed to be.

  As a material of the nut 12 which comprises the pipe joint 10, metals or resin, such as steel materials, are used. The pipe joint 10 of the present embodiment can be used, for example, a pipe joint for hydraulic piping used in automobiles, ships, etc., but is not limited thereto, and is used for other fluids (liquid, gas) Is also possible.

  Next, the operation of the pipe joint 10 provided with the core member 14 will be described.

  As shown in FIG. 1A, in the pipe joint 10, a core member 14 is provided on the other end 12B side of the nut 12 in the axial direction. The core member 14 extends from the inner peripheral side of the bottom portion 20 in the axial direction from the inner peripheral side of the annular bottom portion 20 which is disposed radially outward and on which the concave portion 20A which is curved in the axial concave direction is formed. And a plurality of convex portions 22 disposed on the opposite side of the protruding portion 20A of the bottom portion 20. In the pipe joint 10, a concave insertion portion 40 is provided between the other end 12B of the nut 12 and the plurality of convex portions 22 of the core member 14.

  As shown in FIG. 2, the axial end 44 A of the hose 44 is inserted into the concave insert 40 of the fitting 10. Then, in a state where the end 44A of the hose 44 is inserted to a position contacting the bottom portion 20 of the core member 14 disposed on the back side of the concave insertion portion 40, the nut 12 is rotated to Screw on the male screw 52.

  As shown in FIG. 4, when the nut 12 is tightened to the externally threaded portion 52 of the device 50, the wall portion 32 protruding radially inward of the nut 12 is opposite to the protruding portion 20 A of the bottom portion 20 of the core member 14. By pushing from, the protruding portion 20A of the bottom portion 20 is deformed (see FIG. 5). That is, when the bottom portion 20 and the packing 16 of the core member 14 are sandwiched between the wall portion 32 of the nut 12 and the end surface of the male screw portion 52 of the device 50, the protruding portion 20A of the bottom portion 20 bends outward. In other words, the protrusion 20A deforms in a direction in which the protrusion 20A bends (including a state in which the protrusion 20A is substantially planar). At the same time as the protruding portion 20A of the bottom portion 20 of the core member 14 bends toward the outer peripheral side, the diameter of the tip portion 22A side of the plurality of convex portions 22 increases. That is, the core member 14 has the plurality of convex portions 22 continuously and integrally formed with the bottom portion 20 by bending the protruding portion 20A of the bottom portion 20 to the outer peripheral side (deformation in a direction in which the protruding portion 20A is warped). The tip portion 22A is deformed in the direction of diameter expansion (see FIG. 5).

  As a result, the protrusions 26 provided on the outer periphery of the tip 22 A of the plurality of convex portions 22 bite into the inner peripheral surface of the hose 44. That is, when the projections 26 of the plurality of convex portions 22 hook the hose 44 from the inside, the hose 44 is fixed to the pipe joint 10. Thereby, the hose 44 can be fixed to the pipe joint 10 by one tightening of the nut 12, and the workability by the tightening of the nut 12 as a fastening jig can be improved.

  Further, a plurality of cut portions 20B cut inward in the radial direction are provided on the peripheral edge portion of the bottom portion 20 of the core member 14. As a result, when the nut 12 is fastened to the male screw 52 of the device 50, the protrusion 20A of the bottom 20 is easily bent to the outer peripheral side (the protrusion 20A is easily deformed in the direction in which the protrusion 20A is bent). Therefore, in the core member 14, the protruding portion 20 </ b> A of the bottom portion 20 can be bent to the outer peripheral side, and the diameter of the tip 22 A side of the plurality of convex portions 22 can be expanded more reliably.

  Further, the bottom portion 20 of the core member 14, the plurality of convex portions 22 and the protrusions 26 are integrally formed of metal. As a result, when the nut 12 is fastened to the male screw 52 of the device 50, the protrusion 20A of the bottom 20 is easily bent to the outer peripheral side (the protrusion 20A is easily deformed in the direction in which the protrusion 20A is bent). Therefore, in the core member 14, the protruding portion 20 </ b> A of the bottom portion 20 can be bent to the outer peripheral side, and the diameter of the tip 22 A side of the plurality of convex portions 22 can be expanded more reliably.

  In such a pipe joint 10, by fastening the nut 12 to the male screw portion 52 of the device 50, the diameter of the tip 22 A of the plurality of convex portions 22 of the core member 14 is expanded, and the projection 26 is the inside of the hose 44. The hose 44 is fixed by being caught (cut into). For this reason, in the pipe joint 10, the number of parts is smaller than that in the configuration in which the pipe body holding portion for holding the pipe body (hose) and the mounting portion for mounting to another connecting member are provided independently. Can be reduced. In addition, the pipe joint 10 is a male screw of the nut 12 in comparison with a configuration in which a tube body holding portion for holding a tube body (a hose) and an attachment portion for attaching to another connection member are provided independently. The hose 44 can be fixed to the pipe joint 10 by a single tightening on the part 52, and the workability by the tightening of the nut 12 can be improved.

  Further, in the pipe joint 10, a packing 16 is provided inside the nut 12 on the side opposite to the wall portion 32 of the nut 12 with respect to the bottom portion 20 of the core member 14. Thereby, when the nut 12 is fastened to the male screw 52 of the device 50, the packing 16 is sandwiched between the wall 32 of the nut 12 and the end face of the male screw 52 via the bottom 20 of the core member 14, The nut 12 of the joint 10 and the connection portion 50A of the device 50 are sealed.

  Further, in the pipe joint 10, the O-ring 38 is provided in the groove portion 36 of the inner circumferential surface 34 in the nut 12, and in the state where the hose 44 is inserted into the concave insertion portion 40 of the pipe joint 10 O-ring 38 contacts. Thus, the O-ring 38 seals the nut 12 and the hose 44 of the pipe joint 10.

  The pipe joint 100 of the comparative example is shown in FIG. 6 in a half-cut sectional view. As shown in FIG. 6, the pipe joint 100 includes a joint body 102, a pipe body holding portion 104 in which a hose 130 is held on one axial end 102 A side of the joint body 102, and an axial direction of the joint body 102. The other end portion 102B is provided with an attachment portion 106 attached to the male screw portion 52 of the device 50. The tube body holding portion 104 includes a nut 110 having a female screw portion 110A screwed to an external thread portion 102C provided at one end portion 102A of the joint main body 102, and one end portion 102A of the joint main body 102 on the inner peripheral side of the nut 110. And a cylindrical auxiliary member 112 disposed so as to straddle a portion of the nut 110, and a collet 114 disposed on the inner peripheral side of the auxiliary member 112.

  On the opposite side of the female screw portion 110A in the axial direction of the nut 110, a radially inward projecting portion 110B is provided. On the outer peripheral surface of one end side (protruding part 110B side) of the auxiliary member 112 in the axial direction, a protrusion 112A protruding outward in the radial direction is provided. When the female screw portion 110A of the nut 110 is tightened to the male screw portion 102C of the joint main body 102, the projection 110B of the nut 110 pushes the projection 112A of the auxiliary member 112 and the auxiliary member 112 is pushed backward in the axial direction of the joint main body 102. On the inner peripheral surface of the auxiliary member 112, there is provided a tapered surface 112B whose inner diameter is gradually enlarged toward the back side in the axial direction of the joint main body 102.

  In the collet 114, a plurality of slits (not shown) are formed along the axial direction, and the diameter can be reduced. The outer peripheral surface of the collet 114 is provided with a tapered surface 114 </ b> A whose outer diameter is gradually increased toward the back side in the axial direction of the joint main body 102. Further, on the inner periphery of the collet 114, a plurality of convex portions 114B protruding inward in the radial direction are provided.

  In the tube holding portion 104, when the nut 110 is screwed into the male screw portion 102C of the joint main body 102, the protrusion 110B of the nut 110 pushes the projection 112A of the auxiliary member 112, whereby the auxiliary member 112 is axially moved. Push it back. Thus, the diameter of the collet 114 pressed against the tapered surface 112B of the auxiliary member 112 is reduced, and the plurality of convex portions 114B of the collet 114 bite into the outer peripheral surface of the hose 130, whereby the hose 130 is held.

  The attachment portion 106 includes a nut 120 attached to the other end 102 B of the joint body 102. At one axial end of the nut 120, a protrusion 120A is provided which is inserted into a circumferential groove 102D formed on the outer peripheral surface of the other end 102B of the joint body 102. By inserting the projection 120A of the nut 120 into the circumferential groove 102D of the joint main body 102, removal of the nut 120 from the other end 102B of the joint main body 102 is prevented. The other end of the nut 120 in the axial direction is provided with a female screw 122 that is screwed to the male screw 52 of the device 50. The pipe joint 100 is attached to the device 50 by fastening the female screw portion 122 of the nut 120 to the male screw portion 52 of the device 50.

  In such a pipe joint 100, the pipe body holding portion 104 for holding the hose 130 and the mounting portion 106 for mounting on the device 50 are independent of each other, and each has necessary parts, and the number of parts is increased. For this reason, material cost will become high and the number of preparation steps of the pipe joint 100 will also become large. Further, it is necessary to fasten the nut 110 to the male screw portion 102 C in order to attach the hose 130 to the tube body holding portion 104 and to fasten the nut 120 to the male screw portion 52 in order to attach the mounting portion 106 to the device 50. For this reason, since the tightening work of each nut 110, 120 is needed, workability falls.

  On the other hand, in the pipe joint 10 of the present embodiment, the core member 14 holds the hose 44 by tightening the nut 12 on the male screw portion 52 of the device 50. For this reason, the hose 44 can be fixed by one tightening of the nut 12, and the tightening of the nut 12 as a fastening jig is made in comparison with the pipe joint 100 that requires the two nuts 110 and 120 to be tightened. Workability by can be improved.

  Further, in the pipe joint 10 of the present embodiment, since the bottom 20 side of the core member 14 is disposed on the inner peripheral side of the nut 12, one nut 12 is sufficient compared to the pipe joint 100, The joint main body 102, which is an intermediate part between the pipe holding portion 104 and the mounting portion 106, is not necessary. Therefore, the number of parts can be reduced, the material cost can be reduced, and the handling of the pipe joint 10 becomes easy.

  In addition, although the hose 44 is used in this embodiment, this invention is not limited to a hose, It can change into another pipe body. At that time, a tube having a hardness that allows the protrusions of the core member 14 to bite is preferable. Moreover, when using the tube body which consists of rigid bodies, you may make it the projection part of the core member 14 hook on the circumferential groove of a tubular body by providing a circumferential groove in the inner surface of a tubular body.

Further, in the present embodiment, the core member 14 is made of metal, but the present invention is not limited to this, and the core member 14 may be formed of resin or the like.
Further, in the present embodiment, an example of fastening to the nut 12 of the pipe joint 10 and the device 50 is shown, but the present invention is not limited to the device, and is applicable to the case of fastening to another connecting member .

DESCRIPTION OF SYMBOLS 10 pipe joint, 12 nut, 14 core member, 16 packing (seal member), 20 bottom part, 20A protrusion part, 20B cut part, 22 convex part, 26 protrusion part, 32 wall part, 38 O ring, 40 concave insertion part , 44 hose (tube), 50 device (other connection member), 52 male thread

Claims (6)

An annular bottom which is arranged radially outward and which is concavely curved in the axial direction;
A plurality of convex portions that extend in the axial direction from the inner peripheral side of the bottom portion and are disposed on the opposite side of the protruding portion of the bottom portion, and in which the diameter of the tip end side can be expanded;
And a projection provided on the outer periphery of the tip and hooked from the inside of the tube body,
When fastening with a fastening jig, the protruding portion of the bottom portion is bent to the outer peripheral side while being pushed by the fastening jig, and the diameter of the tip end is enlarged, and the projection hooks and fixes the pipe from inside Core member configured.   The core member according to claim 1, wherein the peripheral portion of the bottom portion is provided with a plurality of notches cut inward in the radial direction.   The core member according to claim 1 or 2, wherein the bottom portion, the plurality of convex portions, and the protrusions are integrally formed of metal. A core member according to any one of claims 1 to 3;
A nut disposed so as to surround the bottom of the core member and constituting the fastening jig;
A concave insertion portion provided between the nut and the plurality of convex portions of the core member and into which a tubular body is inserted;
A wall provided on the nut and projecting radially inwards and pushing the bottom from the opposite side of the projection when the nut is fastened to the external thread of the other connection member;
Fittings with.   In the interior of the nut, between the wall and the end face of the external thread via the bottom when the nut is fastened to the external thread on the opposite side to the wall with respect to the bottom The pipe joint according to claim 4, further comprising a sealing member to be pinched.   The pipe joint according to claim 4 or 5, wherein an O-ring is provided on the inner peripheral side of the nut in contact with the outer peripheral surface of the tubular body in a state in which the tubular body is inserted into the concave insertion portion. .

Images