JP2014222090A - Manufacturing method of joint and hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a joint which can easily manufacture the joint having rigidity allowing the joint employed to even a high-pressure hose, comprising a protection member of the hose, and using a female nut larger in an outside diameter than the protection member as a connecting member, and the hose which is obtained by the method.SOLUTION: There is provided a manufacturing method of a joint which comprises a tubular core body 10 and an outer cylinder 20 arranged at an external periphery of the core body at one end side of the core body, and an insertion hole 31 into which an insertion part 11 formed at the other end side of the core body is inserted, and also includes a female nut 30 comprising a female thread part 32 having an inside diameter larger than an inside diameter of the insertion hole at an end opposite to the insertion hole, and an annular member 40 having an outside diameter which is larger than the inside diameter of the insertion hole of the female nut, and smaller than an inside diameter of the female thread part of the female nut, and externally fit to the insertion part of the core body and fixed thereto. After inserting the insertion part 11 of the core body into the insertion hole 31 of the female nut, the annular member 40 is externally fit to the insertion part of the core body from the tip part side of the insertion part, and fixed thereto.

Description

  The present invention relates to a method for manufacturing a joint (hereinafter, also simply referred to as “manufacturing method”) and a hose, and in particular, a method for manufacturing a joint having a female screw nut that can be applied to a hose covered with a protective cylindrical member. And a hose to which a joint obtained thereby is connected.

  Conventionally, in an ultra-high pressure hose, as shown in FIG. 6A, as an anti-scattering mechanism when ruptured, the outer periphery of a hose body 102 with a joint 101 crimped is covered with a tubular protective member 103. The both ends are fixed by crimping with a sleeve 104. As the protective member 103, a hard vinyl chloride material is generally used.

  As a conventional technique related to a hose provided with a protective member as described above, for example, Patent Document 1 provides a high-pressure hose having flexibility equivalent to a rubber high-pressure hose and reduced frictional resistance. The purpose is to have a hollow cylindrical inner tube open at both ends, a flexible outer tube open at both ends, and a pipe joint provided at both open ends of the inner tube and having a maximum outer diameter larger than the minimum inner diameter of the outer tube. A technique that includes the following is disclosed. Further, Patent Document 2 includes a metal pipe having an insertion portion on one end side and a bowl-shaped head on the other end side, and a mating member that is rotatably fitted to the pipe in a secured state. And a socket metal fitting that forms an insertion space at the end of the hose between the socket body and the insertion portion of the pipe, the pipe is short, and the pipe ends are 70 ° or more The cap nut is fitted to the pipe from the pipe end on the insertion part side, passes through multiple bent parts, and is assembled in the final assembled state in a non-crimped state on the head side. A joint fitting with a cap nut for connecting a hose is disclosed.

Utility Model Registration No. 3168436 (Scope of Claims for Utility Model Registration) JP 2009-236200 A (Claims etc.)

  As described above, the protective member for the ultra-high pressure hose is hard, and it is difficult to perform crimping after being attached to the hose. After the joint 101 is crimped and assembled with the hose 102, the protective member 103 is attached (see FIG. 6B). Therefore, it is necessary to make the outer diameter of the entire hose after the joint assembly smaller than the inner diameter of the protective member. Here, the outer diameter of the entire hose after the joint assembly is substantially the maximum outer diameter of the joint. In general, from the viewpoint of the manageability of the hose, the smaller the clearance between the outer diameter of the hose and the inner diameter of the protective member, the better.

  However, as shown in FIG. 7A, it may be required to combine a member having a large outer diameter such as a female screw nut 105 as a connection member in the joint. As shown in FIG. 7B, when the outer diameter of the female screw nut 105 or the like is larger than the outer diameter of the protective member 103, the protective member 103 is protected because the inner diameter of the protective member 103 is small after assembly by crimping the joint 101. The member 103 could not be mounted, which was a problem. In this case, even if the joint 101 is crimped only on one side of the hose and the protective member 103 is attached, the other side cannot be crimped because of the nut 105. In addition, after mounting the protective member 103, it is possible to attach by inserting a nut whose end is opened in a shape close to a cylindrical shape into the core, and crimping the end to reduce the diameter, Nuts that have been completed by such post-processing have a weaker strength than nuts that are manufactured by cutting a metal material with a shape whose diameter has been reduced at the end. Was not applicable.

  Further, when the joint fitting of Reference 2 has a bent portion bent at a large angle of about 90 °, a connecting member such as a nut to be combined with the joint end is inserted from the end opposite to the end. Even when trying to fit the nut, the nut may be caught by the bent portion and may not pass.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and has a strength that can be applied to an ultra-high pressure hose, and includes a hose protective member and a female screw having a larger outer diameter than the protective member as a connecting member An object of the present invention is to provide a joint manufacturing method capable of easily manufacturing a joint using a nut, and a hose obtained thereby.

  As a result of intensive studies, the present inventor has found that the above-described problem can be solved by adopting the following configuration, and has completed the present invention.

That is, the manufacturing method of the joint of the present invention includes a tubular core body and an outer cylinder body disposed on the outer periphery of the core body on one end side of the core body,
One end is provided with an insertion hole into which the insertion part formed on the other end side of the core body is inserted, and an inner diameter larger than the inner diameter of the insertion hole is provided at the end opposite to the insertion hole. An internal thread nut comprising an internal thread portion having
An annular member having an outer diameter larger than the inner diameter of the insertion hole of the female screw nut and smaller than the inner diameter of the female screw portion of the female screw nut, and being fitted and fixed to the insertion portion of the core body A method,
After the insertion portion of the core body is inserted into the insertion hole of the female screw nut, the annular member is externally inserted and fixed to the insertion portion of the core body from the distal end side of the insertion portion. It is a feature.

  In the present invention, the inner peripheral surface of the annular member and the outer peripheral surface of the insertion portion of the core body are fixed by screwing, the rotational direction of the screw on the inner peripheral surface of the annular member, and the female screw portion It is preferable that the rotation direction is the opposite direction. Further, the present invention is useful when the joint has a bent portion.

The hose of the present invention is a hose in which at least one end of the hose body is crimped between the core body and the outer cylinder body of the joint manufactured by the manufacturing method of the present invention. And
Cylindrical body is disposed on the outer periphery of the hose body, and the inner diameter r _H of the cylindrical body and the outer diameter R _N of the female screw nut, characterized by satisfying the relation r _H ≦ R _N Is.

  According to the present invention, the above-described configuration has a strength that can be applied to an ultra-high pressure hose, and includes a hose protective member and a female screw nut having a larger outer diameter than the protective member as a connecting member It has become possible to realize a joint manufacturing method capable of easily manufacturing a joint using, and a hose obtained thereby.

It is a fragmentary sectional view showing one embodiment of the hose of the present invention. It is an expanded partial sectional view which shows the part of the coupling in the hose of this invention. FIG. 3 is an enlarged half sectional view showing a state where a cylindrical body and a sleeve are removed from the hose of FIG. 2. (A)-(c) is explanatory drawing which concerns on the manufacturing method of the coupling of this invention. It is a fragmentary sectional view showing the example of composition of the hose provided with the external thread nut using the core concerning the present invention, and an annular member. (A), (b) is a fragmentary sectional view which shows the structural example of the conventional hose. (A), (b) is a fragmentary sectional view which shows the structural example of the conventional hose provided with a female screw nut.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, the fragmentary sectional view which shows an example of the hose of this invention is shown. In the hose shown in the figure, a joint 1 is assembled to both ends of a tubular hose body 2, and a tubular body 3 as a protective member for protecting the hose body 2 is disposed on the outer periphery of the hose body 2. ing. Reference numeral 4 denotes a sleeve that is fixed by crimping both ends of the cylindrical body 3.

  In FIG. 2, the expanded partial sectional view of the part of the coupling in the hose of this invention is shown. FIG. 3 is an enlarged half sectional view showing a state in which the cylindrical body and the sleeve are removed from the hose of FIG. As shown in the drawing, the joint 1 according to the present invention includes an annular core body 10 and an outer cylindrical body 20 disposed on the outer periphery thereof at one end portion thereof, and the other end of the core body 10 at one end portion thereof. An insertion hole 31 into which the insertion part 11 formed on the part side is inserted, an internal thread nut 30 having an internal thread part 32 at an end opposite to the insertion hole 31, and an extrapolation to the insertion part 11 of the core body 10 And the annular member 40 fixed. In the female screw nut 30, the female screw portion 32 has an inner diameter larger than the inner diameter of the insertion hole 31. The annular member 40 has an outer diameter that is larger than the inner diameter of the insertion hole 31 of the female screw nut 30 and smaller than the inner diameter of the female screw portion 32 of the female screw nut 30.

  FIG. 4 is an explanatory view according to the method for manufacturing a joint of the present invention. In manufacturing the joint 1 according to the present invention, first, the insertion portion 11 of the core body 10 is inserted into the insertion hole 31 of the female screw nut 30 as shown in FIG. Next, as shown to (b) in a figure, the annular member 40 is extrapolated and fixed with respect to the insertion part 11 of the core 10 from the front end side. At this time, as shown in the drawing, the female screw nut 30 is once moved to a position closer to the outer cylindrical body 20 in the longitudinal direction of the core body 10, and the insertion portion 11 of the core body 10 penetrates the nut hole of the female screw nut 30. By making the tip protrude from the female screw portion 32 side of the female screw nut 30, the annular member 40 can be easily externally inserted into the insertion portion 11 of the core body 10. Then, as shown to (c) in a figure, by moving the internal thread nut 30 to the position of the insertion part 11 of the core body 10 again, it can be set as the coupling 1 as shown in FIGS.

  In the present invention, because of the above configuration, in the hose in which the end portion of the hose body is swaged with a joint, even when a female screw nut having a large outer diameter is provided as a connecting member between the hose and another member, the female screw nut It becomes possible to attach after the assembly of the hose and the joint. Therefore, after assembling the hose and the joint and mounting the protective member for protecting the hose, the female screw nut is attached, so that the hose protective member is provided and the female screw nut is used as the connecting member. It is possible to easily produce a joint useful for an ultra-high pressure hose application.

  That is, conventionally, as shown in FIG. 7, a protruding portion 110 a having a diameter larger than the inner diameter of the insertion hole 105 </ b> A of the female screw nut 105 is provided at the end of the joint body 101 on the connection side with the female screw nut 105. This prevents the female screw nut 105 from coming out of the end portion of the core body 110. However, in the present invention, the end shape of the core body is improved so that the core body has an insertion hole 105A for the female screw nut 105. By using an annular member that can be fixed to the outer peripheral portion of the core body after extrapolating the female screw nut to the core body as a separate member, and having a shape that does not have a convex portion that is larger than the inner diameter of It is possible to assemble the joint by attaching the female screw nut to the end of the core body after mounting the protective member. In the illustrated embodiment, the joint 1 is assembled to both ends of the hose body 2, but the effect of the present invention can be obtained if the joint 1 is assembled to at least one end of the hose body 2. be able to.

  Further, according to the present invention, the female screw nut 30 can be extrapolated from the tip of the core body 10 on the side to be attached, and there is no need to extrapolate from the opposite side. Even in the case of a bent joint having a bent portion of a certain degree, the problem that the nut is caught by the bent portion does not occur.

  In the present invention, the female screw portion 32 of the female screw nut 30 has an inner diameter larger than the inner diameter of the insertion hole 31, and the annular member 40 is larger than the inner diameter of the insertion hole 31 of the female screw nut 30 and the female screw nut 30. Since the outer diameter is smaller than the inner diameter of the female screw portion 32, the insertion portion 11 is inserted in the nut hole of the female screw nut 30 by attaching the annular member 40 to the outer periphery in a state where the insertion portion 11 is inserted into the insertion hole 31. The movement toward the insertion hole 31 is restricted, and the core body 10 does not come out of the insertion hole 31.

  The method of fixing the annular member 40 and the core body 10 is not particularly limited. For example, a threaded portion is provided on the inner peripheral surface of the annular member 40 and the outer peripheral surface of the insertion portion 11 of the core body 10 to form an annular shape. The inner peripheral surface of the member 40 and the outer peripheral surface of the insertion portion 11 of the core body 10 can be screwed together. In this case, in order to connect the hose to other members after manufacturing the joint, the rotation direction of the screw on the inner peripheral surface of the annular member 40 and the rotation direction of the female screw portion 32 of the female screw nut 30 are opposite to each other. When the female screw nut 30 is fastened, it is possible to prevent looseness from occurring in the threaded state of the annular member 40. Specifically, for example, the female screw portion 32 can be a normal right screw, and the screw of the annular member 40 can be a left screw.

  As shown in FIG. 3, in this embodiment, the core body 10 is formed in a tubular shape as a whole, and at one end where the outer cylinder 20 is disposed, at the other end where the female screw nut 30 is mounted. A small diameter portion 12 having an outer diameter smaller than that of the insertion portion 11 is provided. On the outer peripheral surface of the small diameter portion 12, a projection 12a having a cross-sectional shape in which a conical surface whose diameter increases along the direction in which the hose body 2 is inserted is formed. In the longitudinal direction of the core body 10, a circumferential groove portion 13 is provided on the outer surface of the intermediate portion between the insertion portion 11 and the small diameter portion 12. Since the core body 10 crimps the hose body 2 between the small diameter portion 12 and the outer cylinder body 20, the inner diameter of the small diameter portion 12 is such that it can be inserted into the inner cavity of the hose body 2 to be crimped. It is formed.

  The outer cylinder 20 is formed in a tubular shape as a whole, and a plurality of ridges 21 extending in the circumferential direction are provided on the inner peripheral surface thereof. The ridge 21 has a triangular cross section whose width decreases toward the tip. A flange portion 22 that bulges inward along the radial direction and engages with the circumferential groove portion 13 of the core body 10 is formed at the end of the outer cylinder body 20 on the insertion portion 11 side of the core body 10. Since the outer cylindrical body 20 is for crimping the hose body 2 between the outer diameter body 12 and the small-diameter portion 12 of the core body 10, the inner diameter thereof is formed larger than the outer diameter of the hose body 2 to be crimped. By processing, as shown in the drawing, the diameter of the hose body 2 is reduced to be smaller than the outer diameter. Here, in the illustrated embodiment, the core body 10 and the outer cylinder body 20 are formed as separate members, but the core body 10 and the outer cylinder body 20 may be integrated.

  The hose body 2 has at least one end portion crimped between the small-diameter portion 12 of the core body 10 and the outer cylindrical body 20 in the joint 1 to constitute a hose, and has any structure. It may be. The illustrated hose body 2 is a high-pressure hose reinforced by a plurality of reinforcing layers 2A made of a fiber material or a metal material, and the present invention can be suitably applied to, for example, an ultra-high pressure hose having a working pressure of 300 MPa or more. it can.

  The caulking of the hose body 2 can be performed according to a conventional method. That is, first, when the core body 10 and the outer cylinder body 20 are separate members, the inner diameter of the flange portion 22 of the outer cylinder body 20 is set to the side wall 14a, 14b constituting the circumferential groove portion 13 of the core body 10 The outer cylinder body 20 is extrapolated with respect to the core body 10 so as to be larger than at least one outer diameter. After inserting the outer cylindrical body 20 into the core body 10 until the flange portion 22 comes to a position corresponding to the circumferential groove portion 13, the flange portion 22 is pressed radially inward by a crimping tool. 22 has a reduced diameter, and its inner circumferential surface is in close contact with the bottom surface of the circumferential groove portion 13, and the flange portion 22 can be fitted into the circumferential groove portion 13 as shown in the figure. Thereby, the outer cylinder 20 is fixed to the outer periphery of the core body 10. In the case where the core body 10 and the outer cylinder body 20 are formed as one member, this step is not necessary.

  Next, the hose body 2 is inserted between the outer cylindrical body 20 of the joint 1 and the small diameter portion 12 of the core body 10. As shown in the drawing, after inserting the hose body 2 until the end face of the hose body 2 hits the side wall 14b of the core body 10, the entire length of the outer cylinder body 20 is pressed radially inward by a crimping tool to reduce the diameter. By doing so, the plurality of ridges 21 provided on the inner peripheral surface bite into the outer peripheral surface of the hose body 2, and the protrusions 12 a provided on the outer peripheral surface of the small diameter portion 12 bite into the inner peripheral surface of the hose body 2. Thus, the hose body 2 is fixed between the core body 10 and the outer cylinder body 20.

  After crimping the end portion of the hose body 2 between the small diameter portion 12 of the core body 10 and the outer cylinder body 20 as described above, the tubular body 3 is extrapolated to the outer periphery of the hose, Place it at a position that covers the entire length. Next, the pair of sleeves 4 are arranged on the outer periphery of the cylindrical body 3 so as to cover at least a part of both ends of the cylindrical body 3, and the entire length of the sleeve 4 is pressed radially inward by a crimping tool. By reducing the diameter together with the cylindrical body 3, the inner peripheral surface of the cylindrical body 3 comes into close contact with the outer peripheral surface of the outer cylindrical body 20, and the cylindrical body 3 is fixed to the hose as shown in the figure. Thereafter, the joint 1 can be manufactured by attaching the female screw nut 30 to the end of the core body 10 as described above.

In addition, since the cylindrical body 3 is a protective member for protecting the hose body 2, it is arranged at least on the outer periphery of the exposed portion of the hose body 2 that is not covered by the joint 1 to cover the hose body 2. Anything is acceptable. In particular, when the outer diameter R _N of the inner diameter r _H and the female screw nut 30 before caulking of the cylindrical body 3 satisfy the relation of r _H ≦ R _N is after attaching an internally threaded nut 3 to the rod 10 Since the end of the hose on the side where the female screw nut 30 is attached cannot be inserted into the cylindrical body 2, it is useful to apply the present invention. Further, since the sleeve 4 is for fastening the both ends of the cylindrical body 3 and fixing the cylindrical body 3 to the hose, the sleeve 4 only needs to have an inner diameter larger than that of the cylindrical body 3.

  In the present invention, since the nut can be attached to the core body 10 after the cylindrical body 3 is disposed on the outer periphery of the hose body 2, the present invention is not limited to the female screw nut 30 as shown in FIGS. Thus, by using the male screw nut 50 that can be mounted by the same core body 10 and the annular member 40, a joint that can be changed to either male or female fittings can be obtained. Therefore, for example, the male and female can be appropriately changed according to the mating member to be connected at the time of use. Further, in this case, there is an effect that the cost can be reduced by sharing the cores of the male joint and the female joint. Furthermore, the variation as a hose can be increased by changing the thread type.

DESCRIPTION OF SYMBOLS 1 Joint, 2 Hose body, 3 Tubular body, 4 Sleeve, 10 Core body, 11 Insertion part, 12 Small diameter part, 12a Protrusion, 13 Circumferential groove part, 14a, 14b Side wall, 20 Outer cylinder body, 21 Convex strip, 22 Flange Part, 30 female thread nut, 31 insertion hole, 32 female thread part, 40 annular member, 101 joint, 102 hose body, 102a convex part, 103 protective member, 104 sleeve, 105 female thread nut, 105A insertion hole

Claims (4)

A tubular core and an outer cylinder disposed on the outer periphery of the core on one end side of the core;
One end is provided with an insertion hole into which the insertion part formed on the other end side of the core body is inserted, and an inner diameter larger than the inner diameter of the insertion hole is provided at the end opposite to the insertion hole. An internal thread nut comprising an internal thread portion having
An annular member having an outer diameter larger than the inner diameter of the insertion hole of the female screw nut and smaller than the inner diameter of the female screw portion of the female screw nut, and being fitted and fixed to the insertion portion of the core body A method,
After the insertion portion of the core body is inserted into the insertion hole of the female screw nut, the annular member is externally inserted and fixed to the insertion portion of the core body from the distal end side of the insertion portion. A method for manufacturing a joint.   The inner circumferential surface of the annular member and the outer circumferential surface of the insertion portion of the core body are fixed by screwing, and the rotation direction of the screw on the inner circumferential surface of the annular member and the rotation direction of the female screw portion are reversed. The joint manufacturing method according to claim 1, wherein the direction is a direction.   The method for manufacturing a joint according to claim 1, wherein the joint has a bent portion. A hose in which at least one end of the hose body is crimped between the core body and the outer cylinder body of the joint manufactured by the manufacturing method according to claim 1. There,
Cylindrical body is disposed on the outer periphery of the hose body, and the inner diameter r _H of the cylindrical body and the outer diameter R _N of the female screw nut, characterized by satisfying the relation r _H ≦ R _N hose.

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