JP2021042812A - Joint fitting - Google Patents

Joint fitting Download PDF

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JP2021042812A
JP2021042812A JP2019165209A JP2019165209A JP2021042812A JP 2021042812 A JP2021042812 A JP 2021042812A JP 2019165209 A JP2019165209 A JP 2019165209A JP 2019165209 A JP2019165209 A JP 2019165209A JP 2021042812 A JP2021042812 A JP 2021042812A
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inner diameter
nipple
pipe
pipe portion
joint fitting
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JP7401733B2 (en
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博 奥村
Hiroshi Okumura
博 奥村
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Abstract

To reduce pressure loss, and secure detectability of burrs formed inside to suppress the occurrence of pressure loss due to the burrs.SOLUTION: In a joint fitting formed by friction welding between one end part of a first pipe part and an end part of a second pipe part, an inner diameter D2 of the second pipe part is formed to be larger than an inner diameter D1 of the first pipe part, an inner diameter of the one end part of the first pipe part is formed by a large inner diameter part equal to the inner diameter D2 of the second pipe part, and a portion from the large inner diameter part toward the other end part of the first pipe part is formed by an inclined surface part whose inner diameter gradually decreases and which is connected to the inner peripheral surface of the inner diameter D1 of the first pipe part. When a distance from the other end part to the inclined surface part is L, and an angle formed by a pair of inclined surfaces located on the diameter of a conical surface formed by the inclined surface part is θ, the following relation is satisfied: tan(θ/2)<D1/L.SELECTED DRAWING: Figure 5

Description

本発明は、継手金具に関する。 The present invention relates to a joint fitting.

従来、継手金具として、機器などにホースを接続するために、ホースの端部に取り付けられるホース継手金具が提供されている（特許文献１参照）。
ホース継手金具は、互いに結合されたニップルとソケットとを有し、それらニップルとソケットは、同軸上で軸方向の一端が開放されたニップル側筒状部と、前記ニップル側筒状部の半径方向外側に位置するソケット側筒状部とを有している。
そして、ニップル側筒状部の外周面とソケット側筒状部の内周面との間にホースの端部が挿入される環状空間を有している。
ホース継手金具のホースの端部への取り付けは、環状空間にホースの端部を挿入したのち、加締め装置によりソケット側筒状部を加締めることにより、ソケット側筒状部とホースの端部とニップル側筒状部とを一体的に取り付けることでなされる。 Conventionally, as a joint fitting, a hose joint fitting attached to an end portion of a hose for connecting a hose to an apparatus or the like has been provided (see Patent Document 1).
The hose joint fitting has a nipple and a socket connected to each other, and the nipple and the socket are coaxially open at one end in the axial direction on the nipple side tubular portion and in the radial direction of the nipple side tubular portion. It has a socket-side tubular portion located on the outside.
Further, there is an annular space in which the end portion of the hose is inserted between the outer peripheral surface of the tubular portion on the nipple side and the inner peripheral surface of the tubular portion on the socket side.
To attach the hose fitting to the end of the hose, insert the end of the hose into the annular space and then crimp the tubular part of the socket side with a crimping device to tighten the tubular part of the socket side and the end of the hose. And the tubular part on the nipple side are integrally attached.

特開２０１４−１８１７８９号公報Japanese Unexamined Patent Publication No. 2014-181789

ところで、上述のようなホース継手金具では、ホースが取り付けられる端部と反対側のニップルの端部に、筒状のパイプ部を接続する場合、ニップルの内径と同じ内径のパイプ部を接合していたため、比較的小さい寸法の内径が連続することにより圧力損失が増加するという課題があった。
このため、ニップルの端部にニップルの内径より大きい内径のパイプ部を接合することで圧力損失を低下させることができるが、ニップルの端部の内径部に段差が形成されてしまう。
また、ニップルとパイプ部とを摩擦圧接により接合すると、接合面の外周面および内周面にカール形状のバリが環状に形成されるが、内部に形成されたバリは圧力損失を発生させるため切削除去する。
しかしながら、内部のバリを切削除去している際にバリが残ってしまうことがあり、この残ったバリがニップルの内径部に形成された段差に隠れてしまうとバリの検出性が低下するため残ったバリを見逃してしまい、バリによる圧力損失が発生してしまう。
本発明は、上記事情に鑑みなされたものであり、圧力損失の低下を図るとともに、内部に形成されたバリの検出性を確保してバリによる圧力損失の発生を抑制する継手金具を提供することを目的とする。 By the way, in the hose joint fitting as described above, when connecting the tubular pipe portion to the end portion of the nipple on the opposite side to the end portion to which the hose is attached, the pipe portion having the same inner diameter as the inner diameter of the nipple is joined. Therefore, there is a problem that the pressure loss increases due to the continuous inner diameter having a relatively small size.
Therefore, the pressure loss can be reduced by joining a pipe portion having an inner diameter larger than the inner diameter of the nipple to the end portion of the nipple, but a step is formed at the inner diameter portion of the end portion of the nipple.
Further, when the nipple and the pipe portion are joined by friction welding, curl-shaped burrs are formed in an annular shape on the outer peripheral surface and the inner peripheral surface of the joint surface, but the burrs formed inside cause pressure loss and are cut. Remove.
However, burrs may remain when cutting and removing internal burrs, and if these remaining burrs are hidden by the steps formed in the inner diameter of the nipple, the detectability of burrs will decrease, so they will remain. The burrs are overlooked, and pressure loss due to burrs occurs.
The present invention has been made in view of the above circumstances, and provides a joint fitting that reduces pressure loss, secures detectability of burrs formed inside, and suppresses pressure loss due to burrs. With the goal.

上述した目的を達成するため本発明は、第１パイプ部の一方の端部と第２パイプ部の端部とが摩擦圧接されて構成された継手金具であって、前記第２パイプ部の内径Ｄ２を前記第１パイプ部の内径Ｄ１より大きい寸法で形成し、前記第１パイプ部の前記一方の端部の内径を前記第２パイプ部の内径Ｄ２と等しい大内径部で形成し、前記大内径部から前記第１パイプ部の他方の端部に向かう箇所を内径が次第に小さくなり前記第１パイプ部の内径Ｄ１の内周面に接続される傾斜面部で形成し、前記他方の端部から前記傾斜面部までの距離をＬとし、前記傾斜面部で形成される円錐面の直径上に位置する一対の傾斜面がなす角度をθとした場合、ｔａｎ（θ／２）＜Ｄ１／Ｌを満たすことを特徴とする。
また、本発明は、前記角度θは、０°より大きく、４０°以下であることを特徴とする。
また、本発明は、前記第１パイプ部は、前記他方の端部側がホースの端部に連結されるニップルとして形成されていることを特徴とする。
また、本発明は、前記第２パイプ部の前記摩擦圧接されている端部と反対側の端部に、前記パイプ部本体を機器に着脱可能に結合する口金が設けられていることを特徴とする。 In order to achieve the above-mentioned object, the present invention is a joint fitting formed by friction welding the one end of the first pipe portion and the end of the second pipe portion, and the inner diameter of the second pipe portion. D2 is formed with a dimension larger than the inner diameter D1 of the first pipe portion, and the inner diameter of the one end portion of the first pipe portion is formed with a large inner diameter portion equal to the inner diameter D2 of the second pipe portion. The portion from the inner diameter portion toward the other end of the first pipe portion is formed by an inclined surface portion connected to the inner peripheral surface of the inner diameter D1 of the first pipe portion as the inner diameter gradually decreases, and from the other end portion. When the distance to the inclined surface portion is L and the angle formed by the pair of inclined surfaces located on the diameter of the conical surface formed by the inclined surface portion is θ, tan (θ / 2) <D1 / L is satisfied. It is characterized by that.
Further, the present invention is characterized in that the angle θ is larger than 0 ° and 40 ° or less.
Further, the present invention is characterized in that the first pipe portion is formed as a nipple whose other end side is connected to the end portion of the hose.
Further, the present invention is characterized in that, at the end of the second pipe portion opposite to the end of the second pipe portion which is friction-welded, a mouthpiece for detachably connecting the pipe portion main body to the device is provided. To do.

本発明によれば、第２パイプ部の内径Ｄ２を第１パイプ部の内径Ｄ１より大きい寸法で形成し、第１パイプ部の一方の端部の内径を第２パイプ部の内径Ｄ２と等しい大内径部で形成し、大内径部から第１パイプ部の他方の端部に向かう箇所を内径が次第に小さくなり第１パイプ部の内径Ｄ１の内周面に接続される傾斜面部で形成し、他方の端部から傾斜面部までの距離をＬとし、傾斜面部で形成される円錐面の直径上に位置する一対の傾斜面がなす角度をθとした場合、ｔａｎ（θ／２）＜Ｄ１／Ｌを満たすものであるため、第２パイプ部の内径Ｄ２を第１パイプ部の内径Ｄ１より大きくすることで圧力損失の低下を図るとともに、内部に形成されたバリの検出性を確保してバリによる圧力損失の発生を抑制する上で有利となる。
また、第１パイプ部の大内径部から傾斜面部を設けて内径Ｄ１の内周面に接続することで、バリ取り性が向上するとともに、内周面の洗浄度を向上させる上で有利となる。
また、本発明によれば、角度θを０°より大きく、４０°以下で設定しているため、圧力損失の増加を抑制する上で有利となる。 According to the present invention, the inner diameter D2 of the second pipe portion is formed to have a size larger than the inner diameter D1 of the first pipe portion, and the inner diameter of one end of the first pipe portion is as large as the inner diameter D2 of the second pipe portion. It is formed by the inner diameter portion, and the portion from the large inner diameter portion toward the other end of the first pipe portion is formed by the inclined surface portion connected to the inner peripheral surface of the inner diameter D1 of the first pipe portion as the inner diameter gradually decreases. When the distance from the end to the inclined surface is L and the angle formed by the pair of inclined surfaces located on the diameter of the conical surface formed by the inclined surface is θ, tan (θ / 2) <D1 / L In order to satisfy the above conditions, the inner diameter D2 of the second pipe portion is made larger than the inner diameter D1 of the first pipe portion to reduce the pressure loss, and the detectability of the burrs formed inside is ensured by the burrs. This is advantageous in suppressing the occurrence of pressure loss.
Further, by providing an inclined surface portion from the large inner diameter portion of the first pipe portion and connecting it to the inner peripheral surface of the inner peripheral surface D1, it is advantageous in improving the deburring property and improving the cleaning degree of the inner peripheral surface. ..
Further, according to the present invention, since the angle θ is set to be larger than 0 ° and 40 ° or less, it is advantageous in suppressing an increase in pressure loss.

ホース継手金具の半部断面図である。It is a half sectional view of a hose joint fitting. ホース継手金具の半部断面図である。It is a half sectional view of a hose joint fitting. バリが発生しているホース継手金具の半部断面図である。It is a cross-sectional view of a half part of a hose joint fitting where burrs are generated. 本実施の形態のホース継手金具の断面図である。It is sectional drawing of the hose joint metal fitting of this embodiment. （Ａ）は本実施の形態のニップルの断面図であり、（Ｂ）は比較対象のニップルの断面図である。(A) is a cross-sectional view of the nipple of the present embodiment, and (B) is a cross-sectional view of the nipple to be compared. パイプ（管）の角度θと損失係数εの関係を示すグラフである。It is a graph which shows the relationship between the angle θ of a pipe (pipe) and the loss coefficient ε. 実験例の説明である。This is a description of an experimental example. バリの切削除去手順を示す説明図である。It is explanatory drawing which shows the cutting removal procedure of a burr.

以下、本発明の実施の形態の継手金具をホース継手金具に適用した例について図面を参照して説明する。
まず、図１を参照してホース継手金具について説明する。
ホース継手金具１０は、ホースの端部に連結され、ホース内を流れる流体を適宜機器に供給し、あるいは、適宜機器から排出させるものである。
図１に示すように、ホース継手金具１０は金属製であり、ニップル１２と、ソケット１４と、パイプ部１６と、ナット部１８と、を含んで構成されている。 Hereinafter, an example in which the joint fitting according to the embodiment of the present invention is applied to the hose joint fitting will be described with reference to the drawings.
First, the hose joint fitting will be described with reference to FIG.
The hose joint fitting 10 is connected to the end of the hose and appropriately supplies the fluid flowing in the hose to the device or discharges the fluid from the device as appropriate.
As shown in FIG. 1, the hose joint fitting 10 is made of metal and includes a nipple 12, a socket 14, a pipe portion 16, and a nut portion 18.

ニップル１２（第１パイプ部）は、基部２０とカラー部２２と結合用溝２４とニップル側筒状部２６とが同軸上に並べられて構成されている。
基部２０は、パイプ部１６に接合される箇所であり筒状をなし、端部は接合面Ｊとして形成されている。
カラー部２２は、基部１６の端部近傍に設けられ、基部２０よりも大きい寸法の外径で形成されている。
結合用溝２４は、ソケット１４の軸方向の一端１４Ａが結合される箇所である。
結合用溝２４に隣接して鍔部２８が設けられている。
鍔部２８の両側の端面のうち一方の端面は結合用溝２４の側面で形成され、鍔部２８の他方の端面からニップル側筒状部２６が突出している。
ニップル側筒状部２６は、ホースの内周面に挿入される部分である。
ニップル側筒状部２６の外周面には、周方向に延在する複数の係止用凹凸部２６０２が軸方向に間隔をおいて形成されている。 The nipple 12 (first pipe portion) is configured such that the base portion 20, the collar portion 22, the coupling groove 24, and the nipple side tubular portion 26 are coaxially arranged.
The base portion 20 is a portion to be joined to the pipe portion 16 and has a tubular shape, and the end portion is formed as a joint surface J.
The collar portion 22 is provided near the end portion of the base portion 16 and is formed with an outer diameter larger than that of the base portion 20.
The coupling groove 24 is a portion where one end 14A of the socket 14 in the axial direction is coupled.
A flange portion 28 is provided adjacent to the coupling groove 24.
One of the end faces on both sides of the flange portion 28 is formed on the side surface of the coupling groove 24, and the nipple side tubular portion 26 projects from the other end face of the collar portion 28.
The nipple-side tubular portion 26 is a portion inserted into the inner peripheral surface of the hose.
On the outer peripheral surface of the nipple-side tubular portion 26, a plurality of locking uneven portions 2602 extending in the circumferential direction are formed at intervals in the axial direction.

ソケット１４は、その軸方向の一端１４Ａが結合用溝２４に加締められ、結合されて配設されている。
ソケット１４は、結合用溝２４に加締められた部分に連続しニップル側筒状部２６の半径方向外側の箇所で筒状に延在するソケット側筒状部３０を有している。
ソケット側筒状部３０の内周面には、周方向に延在する複数の係止用凸部３００２が軸方向に間隔をおいて形成されている。 One end 14A of the socket 14 in the axial direction is crimped to the coupling groove 24, and the socket 14 is arranged so as to be coupled.
The socket 14 has a socket-side tubular portion 30 that is continuous with the portion crimped to the coupling groove 24 and extends in a tubular shape at a portion on the radial outer side of the nipple-side tubular portion 26.
On the inner peripheral surface of the socket-side tubular portion 30, a plurality of locking convex portions 3002 extending in the circumferential direction are formed at intervals in the axial direction.

ホースの端部が挿入される環状空間Ｓは、ニップル側筒状部２６の外周面とソケット側筒状部３０の内周面との間に形成されている。
環状空間Ｓは、それらニップル側筒状部２６とソケット側筒状部３０の軸方向の一端が開口部とされ、長手方向の他端はソケット１４の一端１４Ａが結合用溝２４に結合されることにより閉塞されている。
なお、ホース継手金具１０は多種のものが存在し、本発明は、ニップル１２の外周部にソケット１４の軸方向の一端１４Ａが結合され、ニップル１２の外周部とソケット１４の内周部との間にホース挿入用の環状空間Ｓがソケット１４の軸方向の他端に開放状に設けられるホース継手金具１０の全てに適用可能である。 The annular space S into which the end of the hose is inserted is formed between the outer peripheral surface of the nipple-side tubular portion 26 and the inner peripheral surface of the socket-side tubular portion 30.
In the annular space S, one end in the axial direction of the nipple-side tubular portion 26 and the socket-side tubular portion 30 is an opening, and one end 14A of the socket 14 is coupled to the coupling groove 24 at the other end in the longitudinal direction. It is blocked by this.
There are various types of hose joint fittings 10, and in the present invention, one end 14A of the socket 14 in the axial direction is coupled to the outer peripheral portion of the nipple 12, and the outer peripheral portion of the nipple 12 and the inner peripheral portion of the socket 14 are connected. An annular space S for inserting a hose is applicable to all of the hose joint fittings 10 provided openly at the other end of the socket 14 in the axial direction.

ホース継手金具１０にホースを連結する場合は、環状空間Ｓにホースを挿入し、ソケット側筒状部３０の半径方向外側に配置された加締め装置の複数の加締め爪を縮径させ、ソケット側筒状部３０を加締めることで、ソケット側筒状部３０とホースの端部とニップル側筒状部２６とを結合する。 When connecting the hose to the hose joint fitting 10, the hose is inserted into the annular space S, and the plurality of crimping claws of the crimping device arranged on the outer side in the radial direction of the socket side tubular portion 30 are reduced in diameter to reduce the diameter of the socket. By crimping the side tubular portion 30, the socket side tubular portion 30, the end of the hose, and the nipple side tubular portion 26 are connected.

パイプ部１６（第２パイプ部）は、均一内径の筒状に形成されている。
パイプ部１６の端部の接合面Ｊと、ニップル１２（第１パイプ部）の接合面Ｊとは摩擦圧接で接合されている。
すなわち、パイプ部１６の一方の端部１６Ａは、ニップル１２の一方の端部１２Ａ、つまり基部２０の端部２０Ａに摩擦圧接により接合される。
パイプ部１６の他方の端部１６Ｂには、ナット部１８が回転可能にかつ抜落不能に設けられている。
ナット部１８は、パイプ部本体１０Ａを機器や他のパイプ部などに着脱可能に結合する口金の一例であって、ナットを有していない口金が接続されてもよい。 The pipe portion 16 (second pipe portion) is formed in a tubular shape having a uniform inner diameter.
The joint surface J at the end of the pipe portion 16 and the joint surface J of the nipple 12 (first pipe portion) are joined by friction welding.
That is, one end 16A of the pipe portion 16 is joined to one end 12A of the nipple 12, that is, the end 20A of the base 20 by friction welding.
A nut portion 18 is provided at the other end portion 16B of the pipe portion 16 so as to be rotatable and non-removable.
The nut portion 18 is an example of a mouthpiece that detachably connects the pipe part main body 10A to a device, another pipe part, or the like, and a mouthpiece that does not have a nut may be connected.

図４に示すように、本実施の形態のホース継手金具１０では、パイプ部１６の内径Ｄ２がニップル１２の内径Ｄ１より大きい寸法で形成されており、ニップル１２は、一方の端部１２Ａ側から大内径部１２０２、傾斜面部１２０４、本体内径部１２０６が同軸上に連続して形成されている。
大内径部１２０２は、ニップル１２の一方の端部１２Ａに設けられており、その内径はパイプ部１６の内径Ｄ２と等しい寸法で形成されている。
傾斜面部１２０４は、大内径部１２０２からニップル部１２の他方の端部１２Ｂに向かう箇所に設けられており、その内径は内径Ｄ２と等しい寸法から内径Ｄ１と等しい寸法になるよう次第に小さくりニップル１２の内径Ｄ１の内周面に接続されるように形成されている。
本体内径部１２０６は、傾斜面部１２０４からニップル部１２の他方の端部１２Ｂまでに設けられており、均一内径Ｄ１で形成されている。 As shown in FIG. 4, in the hose joint fitting 10 of the present embodiment, the inner diameter D2 of the pipe portion 16 is formed to have a size larger than the inner diameter D1 of the nipple 12, and the nipple 12 is formed from one end 12A side. The large inner diameter portion 1202, the inclined surface portion 1204, and the main body inner diameter portion 1206 are formed coaxially and continuously.
The large inner diameter portion 1202 is provided at one end portion 12A of the nipple 12, and the inner diameter thereof is formed to have the same dimensions as the inner diameter D2 of the pipe portion 16.
The inclined surface portion 1204 is provided at a position from the large inner diameter portion 1202 toward the other end portion 12B of the nipple portion 12, and the inner diameter thereof is gradually reduced from the same dimension as the inner diameter D2 to the same dimension as the inner diameter D1. It is formed so as to be connected to the inner peripheral surface of the inner diameter D1 of the.
The main body inner diameter portion 1206 is provided from the inclined surface portion 1204 to the other end portion 12B of the nipple portion 12, and is formed with a uniform inner diameter D1.

ここで、本実施の形態のホース継手金具１０が、ニップル１２の内径は変更せずにパイプ部１６の内径を大きくし、ニップル１２にテーパー（傾斜面部１２０４）を形成した経緯を説明し、その後にテーパーの角度（傾斜面部１２０４の角度）について説明する。
図１に示すように、一般的には、ホース継手金具１０は、パイプ部１６の内径がニップル１２の内径と等しい寸法で形成されている。
ホース継手金具１０の内部に流体が流れる際の圧力損失は、内径を大きくするほど低下することが知られているが、ホースの内径はＪＩＳ（Japanese Industrial Standards）規格に基づいて形成されるため、ニップル部１２の内外径寸法もホースの内径に合わせて制約を受けることになる。
従って、図２に示すように、ニップル１２のニップル側筒状部２６の内径は変更せずに、パイプ部１６の内径を大きくすることで圧力損失を低下させる。
なお、図２以降に示すホース継手金具１０は、ソケット１４を省略した図となっている。 Here, the process in which the hose joint fitting 10 of the present embodiment increases the inner diameter of the pipe portion 16 without changing the inner diameter of the nipple 12 and forms a taper (inclined surface portion 1204) on the nipple 12 will be described. The taper angle (angle of the inclined surface portion 1204) will be described.
As shown in FIG. 1, in general, the hose joint fitting 10 is formed so that the inner diameter of the pipe portion 16 is equal to the inner diameter of the nipple 12.
It is known that the pressure loss when a fluid flows inside the hose joint fitting 10 decreases as the inner diameter increases. However, since the inner diameter of the hose is formed based on the JIS (Japanese Industrial Standards) standard, The inner and outer diameter dimensions of the nipple portion 12 are also restricted according to the inner diameter of the hose.
Therefore, as shown in FIG. 2, the pressure loss is reduced by increasing the inner diameter of the pipe portion 16 without changing the inner diameter of the nipple side tubular portion 26 of the nipple 12.
The hose joint fitting 10 shown in FIGS. 2 and 2 is a diagram in which the socket 14 is omitted.

図２に示すホース継手金具１０は、パイプ部１６の内径Ｄ２を、ニップル１２の内径Ｄ１より大きい寸法で形成している（Ｄ１＜Ｄ２）。
これにより、パイプ部１６を接合するニップル１２の一方の端部１２Ａの内径に段差Ｘが形成され、この段差Ｘによっても圧力損失が発生するが、パイプ部１６の内径Ｄ２を大きくしたことによる圧力損失の低下により、ホース継手金具１０全体としての圧力損失は低下することになる。
しかし、この段差Ｘにより異なる問題が生じる。 In the hose joint fitting 10 shown in FIG. 2, the inner diameter D2 of the pipe portion 16 is formed to have a size larger than the inner diameter D1 of the nipple 12 (D1 <D2).
As a result, a step X is formed on the inner diameter of one end 12A of the nipple 12 to which the pipe portion 16 is joined, and a pressure loss is also generated by this step X, but the pressure due to the increase in the inner diameter D2 of the pipe portion 16 Due to the reduction in loss, the pressure loss of the hose joint fitting 10 as a whole is reduced.
However, this step X causes different problems.

具体的には、ニップル１２とパイプ部１６とを摩擦圧接により接合する際、接合面Ｊの外周面および内周面にカール形状のバリＢ（図８（Ｂ）参照）が環状に形成されてしまうが、外周面のバリＢは他の部品に引っ掛かったり接触により怪我をする恐れがあり、内部のバリＢは、圧力損失を発生させるため、外周面および内周面のバリＢは切削除去する。
しかしながら、内部のカール形状のバリＢを切削除去している際に、バリＢが残ってしまうことがあり、図３に示すように、この残ったバリＢがニップル１２の内径に形成された段差Ｘの近傍まで移動して段差Ｘに隠れてしまうと、残ったバリＢを見逃してしまい除去できないことがある。
そこで、本実施の形態では、図４に示すように、ニップル１２の内径は変更せずにパイプ部１６の内径を大きくし、さらにニップル１２の内径の段差Ｘをなくすためにニップル１２にテーパーを形成している。
なお、ニップル１２の内部のバリは、ナット部１８側より距離が近いニップル１２側の開口部から検出するのが一般的である。 Specifically, when the nipple 12 and the pipe portion 16 are joined by friction welding, curl-shaped burrs B (see FIG. 8B) are formed in an annular shape on the outer peripheral surface and the inner peripheral surface of the joint surface J. However, the burr B on the outer peripheral surface may be caught by other parts or injured by contact, and the burr B on the inner surface causes pressure loss. Therefore, the burr B on the outer peripheral surface and the inner peripheral surface is removed by cutting. ..
However, when the curl-shaped burr B inside is cut off, the burr B may remain, and as shown in FIG. 3, the remaining burr B is a step formed in the inner diameter of the nipple 12. If it moves to the vicinity of X and is hidden by the step X, the remaining burr B may be overlooked and cannot be removed.
Therefore, in the present embodiment, as shown in FIG. 4, the inner diameter of the pipe portion 16 is increased without changing the inner diameter of the nipple 12, and the nipple 12 is tapered in order to eliminate the step X in the inner diameter of the nipple 12. Is forming.
The burr inside the nipple 12 is generally detected from the opening on the nipple 12 side, which is closer than the nut portion 18 side.

次に、テーパーの角度、すなわち傾斜面部１２０４の角度について説明する。
大内径部１２０２および傾斜面部１２０４に残ってしまったバリを検出する場合、ニップル１２側の開口部から大内径部１２０２および傾斜面部１２０４の内周面が視認できるように、傾斜面部１２０４の傾斜角を形成する。
すなわち、図５（Ａ）のＶ１に示すように、傾斜面部１２０４の内周面の延長線がニップル１２の他方の端部１２Ｂ側の開口部に達するように角度θを設定した場合は、その開口部から傾斜面部１２０４および大内径部１２０２が視認できることになり、ニップル１２の内部に形成されたバリを検出できる。
一方、図５（Ｂ）のＶ２に示すように、傾斜面部１２０４の内周面の延長線がニップル１２の開口部に達することなくニップル側筒状体２６の内周面にぶつかるように角度θを設定した場合は、その開口部から傾斜面部１２０４および大内径部１２０２が視認できないことになる。 Next, the angle of the taper, that is, the angle of the inclined surface portion 1204 will be described.
When detecting burrs remaining on the large inner diameter portion 1202 and the inclined surface portion 1204, the inclination angle of the inclined surface portion 1204 so that the inner peripheral surfaces of the large inner diameter portion 1202 and the inclined surface portion 1204 can be visually recognized from the opening on the nipple 12 side. To form.
That is, as shown in V1 of FIG. 5A, when the angle θ is set so that the extension line of the inner peripheral surface of the inclined surface portion 1204 reaches the opening on the other end 12B side of the nipple 12, the angle θ is set. The inclined surface portion 1204 and the large inner diameter portion 1202 can be visually recognized from the opening, and burrs formed inside the nipple 12 can be detected.
On the other hand, as shown in V2 of FIG. 5B, the angle θ is such that the extension line of the inner peripheral surface of the inclined surface portion 1204 hits the inner peripheral surface of the nipple side tubular body 26 without reaching the opening of the nipple 12. When is set, the inclined surface portion 1204 and the large inner diameter portion 1202 cannot be visually recognized from the opening.

従って、ニップル１２の他方の端部１２Ｂから傾斜面部１２０４までの距離である本体内径部１２０６の軸心方向の距離をＬとし、傾斜面部１２０４で形成される円錐面の直径上に位置する一対の傾斜面がなす角度をθとした場合、以下の式（１）を満たすように、傾斜面部１２０４の傾斜角を形成する。
ｔａｎ（θ／２）＜Ｄ１／Ｌ……（１） Therefore, let L be the distance in the axial direction of the main body inner diameter portion 1206, which is the distance from the other end 12B of the nipple 12 to the inclined surface portion 1204, and a pair of pairs located on the diameter of the conical surface formed by the inclined surface portion 1204. When the angle formed by the inclined surface is θ, the inclined surface portion 1204 is formed so as to satisfy the following equation (1).
tan (θ / 2) <D1 / L …… (1)

さらに、本実施の形態のホース継手金具１０は、ニップル１２のニップル側筒状部２６の内径は変更せずに、パイプ部１６の内径を大きくすることで圧力損失を低下させるため、ニップル１２に傾斜部１２０４によるテーパーを形成した場合の圧力損失が、ニップル１２の内径に段差Ｘが形成された場合（図２）の圧力損失より増加しないように角度θの範囲を定める必要がある。 Further, in the hose joint fitting 10 of the present embodiment, the inner diameter of the tubular portion 26 on the nipple side of the nipple 12 is not changed, and the inner diameter of the pipe portion 16 is increased to reduce the pressure loss. It is necessary to determine the range of the angle θ so that the pressure loss when the taper is formed by the inclined portion 1204 does not increase from the pressure loss when the step X is formed on the inner diameter of the nipple 12 (FIG. 2).

図６では、パイプ（管）の断面積を拡大していった場合の角度θと損失係数εの関係をグラフに示している。
内径Ｄ１のパイプを１．５倍の内径Ｄ２に拡大していった場合の角度θと損失係数εの関係をグラフＧ１で示し、内径Ｄ１のパイプを３倍の内径Ｄ２に拡大していった場合の角度θと損失係数εの関係をグラフＧ２で示している。
損失ヘッド（ｈ）は、以下の式（２）で表すことができる。
ｈ＝ε（ｑ１−ｑ２）２／２ｇ……（２）
ε：損失係数
ｑ１：管径内径Ｄ１の平均流速
ｑ２：管径内径Ｄ２の平均流速
ｇ：重力加速度 In FIG. 6, the relationship between the angle θ and the loss coefficient ε when the cross-sectional area of the pipe is expanded is shown in a graph.
The relationship between the angle θ and the loss coefficient ε when the pipe with the inner diameter D1 is expanded to 1.5 times the inner diameter D2 is shown in the graph G1, and the pipe with the inner diameter D1 is expanded to the inner diameter D2 three times. The relationship between the angle θ and the loss factor ε in the case is shown in graph G2.
The loss head (h) can be expressed by the following equation (2).
h = ε (q1-q2) 2 / 2g …… (2)
ε: Loss coefficient q1: Average flow velocity of pipe diameter inner diameter D1 q2: Average flow velocity of pipe diameter inner diameter D2 g: Gravity acceleration

図６において、角度θ＝０°は、パイプを拡大しない場合であり、図１に示すように均一内径の場合である。
また、角度θ＝１８０°は、パイプを半径方向外側に拡大した場合であり、図２に示すようにニップル１２の内径に段差Ｘが形成されている場合であって、グラフＧ１、Ｇ２において損失係数ε≒１となっていることがわかる。
従って、本発明者は、損失係数ε＜１となるような角度θを設定するための実験を行い、実験例を図７に示している。 In FIG. 6, the angle θ = 0 ° is the case where the pipe is not enlarged and the case where the inner diameter is uniform as shown in FIG.
Further, the angle θ = 180 ° is a case where the pipe is enlarged outward in the radial direction, and a step X is formed in the inner diameter of the nipple 12 as shown in FIG. 2, and the loss in the graphs G1 and G2. It can be seen that the coefficient ε≈1.
Therefore, the present inventor conducted an experiment for setting an angle θ such that the loss coefficient ε <1, and an example of the experiment is shown in FIG.

図７の実験例では、ニップル１２の軸心方向の長さを７１．０ｍｍ、ニップル１２の本体内径部１２０６の軸心方向の長さ（距離Ｌ）を５２．０ｍｍ、ニップル１２の本体内径部１２０６の内径Ｄ１をφ１５．０ｍｍ、ニップル１２の大内径部１２０２およびパイプ部１６の内径Ｄ２をφ１９．４ｍｍとした。
角度θを４０°、３５°、３０°、２５°、２０°、１５°、１０°とした場合のそれぞれ実験例１〜７では損失係数εが１未満となり、圧力損失がニップル１２の内径に段差Ｘが形成された場合（図２）の圧力損失より低下する。
一方、角度θを４５°、５０°とした場合の比較例１、２、すなわち角度θを４０°より大きくした場合では、損失係数εが１以上となり、圧力損失がニップル１２の内径に段差Ｘが形成された場合（図２）の圧力損失より増加してしまう。
以上より、角度θは、０°より大きく、４０°以下であればよい。
なお、角度θは３０°以上４０°以下であることが好ましいが、ニップル１２の軸方向の長さにより適宜調整する。 In the experimental example of FIG. 7, the length of the nipple 12 in the axial direction is 71.0 mm, the length of the inner diameter portion 1206 of the nipple 12 in the axial direction (distance L) is 52.0 mm, and the inner diameter portion of the main body of the nipple 12 is 52.0 mm. The inner diameter D1 of 1206 was φ15.0 mm, and the inner diameter D2 of the large inner diameter portion 1202 of the nipple 12 and the pipe portion 16 was φ19.4 mm.
When the angles θ are 40 °, 35 °, 30 °, 25 °, 20 °, 15 °, and 10 °, the loss coefficient ε is less than 1 in Experimental Examples 1 to 7, and the pressure loss is the inner diameter of the nipple 12. It is lower than the pressure loss when the step X is formed (FIG. 2).
On the other hand, in Comparative Examples 1 and 2 when the angles θ are 45 ° and 50 °, that is, when the angle θ is larger than 40 °, the loss coefficient ε is 1 or more, and the pressure loss is a step X on the inner diameter of the nipple 12. Will increase from the pressure loss when is formed (FIG. 2).
From the above, the angle θ may be larger than 0 ° and 40 ° or less.
The angle θ is preferably 30 ° or more and 40 ° or less, but is appropriately adjusted depending on the axial length of the nipple 12.

次に、図８を参照して、ニップル１２とパイプ部１６を摩擦圧接により接合したのちバリＢを切削除去するまでの手順について説明する。
まず、ニップル１２の一方の端部１２Ａと、パイプ部１６の一方の端部１６Ａとを摩擦圧接により接合すると（図８（Ａ））、接合面Ｊの外周面および内周面にカール形状のバリＢが環状に形成される（図８（Ｂ））。
外周面に形成されたバリＢをバリ取り工具４０により除去し、ドリル４２によるドリル加工により内周面に形成されたバリＢを除去し、摩擦を抑えたりホース継手金具１０を冷却するためにパイプ部１６からニップル１２に向けて内部に切削油を流す（図８（Ｃ））。
内周面に形成されたバリＢはドリル加工だけでは除去できないため、内径バリ取り工具４４を挿入してバリＢを除去し、内径の仕上げ処理を行う（図８（Ｄ））。
ドリル加工に加え、仕上げ処理を行っても内周面に形成されたバリは除去できない場合があり、小さくなった環状のバリが切削油によって傾斜面部１２０４に押し付けられてしまう（図８（Ｅ））。
本実施の形態のホース継手金具３０のニップルは、上述した式（１）を満たし、かつ０°より大きく４０°以下の角度θにより傾斜面部１２０４が形成されており、ニップル１２側の開口部から内周面を視認できるため、バリ取り用パイプ４６を挿入してパイプの内径に残ったバリを除去する（図８（Ｆ））。 Next, with reference to FIG. 8, a procedure from joining the nipple 12 and the pipe portion 16 by friction welding to cutting and removing the burr B will be described.
First, when one end 12A of the nipple 12 and one end 16A of the pipe portion 16 are joined by friction welding (FIG. 8A), the outer peripheral surface and the inner peripheral surface of the joint surface J have a curl shape. The burr B is formed in a ring shape (FIG. 8 (B)).
The burr B formed on the outer peripheral surface is removed by the deburring tool 40, the burr B formed on the inner peripheral surface is removed by drilling with the drill 42, and the pipe is used to suppress friction and cool the hose joint fitting 10. Cutting oil is flowed inside from the portion 16 toward the nipple 12 (FIG. 8 (C)).
Since the burr B formed on the inner peripheral surface cannot be removed only by drilling, the inner diameter deburring tool 44 is inserted to remove the burr B, and the inner diameter is finished (FIG. 8 (D)).
The burrs formed on the inner peripheral surface may not be removed even if the finishing process is performed in addition to the drilling process, and the small annular burrs are pressed against the inclined surface portion 1204 by the cutting oil (FIG. 8 (E)). ).
The nipple of the hose joint fitting 30 of the present embodiment satisfies the above-mentioned formula (1), and the inclined surface portion 1204 is formed by an angle θ larger than 0 ° and 40 ° or less, and the inclined surface portion 1204 is formed from the opening on the nipple 12 side. Since the inner peripheral surface can be visually recognized, the deburring pipe 46 is inserted to remove the burrs remaining on the inner diameter of the pipe (FIG. 8 (F)).

このように、本実施の形態のホース継手金具１０は、パイプ部１６の内径Ｄ２をニップル１２の内径Ｄ１より大きい寸法で形成し、ニップル１２の一方の端部１２Ａの内径をパイプ部１６の内径Ｄ２と等しい大内径部１２０２で形成し、大内径部１２０２からニップル１２の他方の端部１２Ｂに向かう箇所を内径が次第に小さくなりニップル１２の内径Ｄ１の本体内径部１２０６の内周面に接続される傾斜面部１２０４で形成し、他方の端部１１２Ｂから傾斜面部１２０４までの距離をＬとし、傾斜面部１２０４で形成される円錐面の直径上に位置する一対の傾斜面がなす角度をθとした場合、ｔａｎ（θ／２）＜Ｄ１／Ｌを満たすものであるため、圧力損失の低下を図るとともに、内部に形成されたバリＢの検出性を確保してバリＢによる圧力損失の発生を抑制する上で有利となる。
また、ニップル１２の大内径部１２０２から傾斜面部１２０４を設けて内径Ｄ１の本体内径部１２０６の内周面に接続することで、バリ取り性が向上するとともに、内周面の洗浄度を向上させる上で有利となる。
また、角度θを０°より大きく、４０°以下で設定しているため、ホース継手金具１０の圧力損失をニップル１２に段差Ｘが形成された場合の圧力損失より低下させることができ、圧力損失の増加を抑制する上で有利となる。 As described above, in the hose joint fitting 10 of the present embodiment, the inner diameter D2 of the pipe portion 16 is formed to be larger than the inner diameter D1 of the nipple 12, and the inner diameter of one end 12A of the nipple 12 is the inner diameter of the pipe portion 16. It is formed by a large inner diameter portion 1202 equal to D2, and the inner diameter of the portion from the large inner diameter portion 1202 toward the other end 12B of the nipple 12 gradually decreases and is connected to the inner peripheral surface of the main body inner diameter portion 1206 of the inner diameter D1 of the nipple 12. The distance from the other end 112B to the inclined surface 1202 is L, and the angle formed by the pair of inclined surfaces located on the diameter of the conical surface formed by the inclined surface 1202 is θ. In this case, since tan (θ / 2) <D1 / L is satisfied, the pressure loss is reduced, and the detectability of the burr B formed inside is ensured to suppress the occurrence of the pressure loss due to the burr B. It will be advantageous to do so.
Further, by providing the inclined surface portion 1204 from the large inner diameter portion 1202 of the nipple 12 and connecting it to the inner peripheral surface of the main body inner peripheral portion 1206 of the inner diameter D1, the deburring property is improved and the degree of cleaning of the inner peripheral surface is improved. It will be advantageous on.
Further, since the angle θ is set to be larger than 0 ° and 40 ° or less, the pressure loss of the hose joint fitting 10 can be made lower than the pressure loss when the step X is formed on the nipple 12, and the pressure loss can be reduced. It is advantageous in suppressing the increase in the amount of water.

１０ ホース継手金具
１２ ニップル
１４ ソケット
１６ パイプ部
１８ ナット部
２０ 基部
２２ カラー部
２４ 結合用溝
２６ ニップル側筒状部
２８ 鍔部
３０ ソケット側筒状部 10 Hose fittings 12 Nipple 14 Socket 16 Pipe part 18 Nut part 20 Base part 22 Collar part 24 Coupling groove 26 Nipple side tubular part 28 Flange part 30 Socket side tubular part

Claims (4)

第１パイプ部の一方の端部と第２パイプ部の端部とが摩擦圧接されて構成された継手金具であって、
前記第２パイプ部の内径Ｄ２を前記第１パイプ部の内径Ｄ１より大きい寸法で形成し、
前記第１パイプ部の前記一方の端部の内径を前記第２パイプ部の内径Ｄ２と等しい大内径部で形成し、
前記大内径部から前記第１パイプ部の他方の端部に向かう箇所を内径が次第に小さくなり前記第１パイプ部の内径Ｄ１の内周面に接続される傾斜面部で形成し、
前記他方の端部から前記傾斜面部までの距離をＬとし、前記傾斜面部で形成される円錐面の直径上に位置する一対の傾斜面がなす角度をθとした場合、
以下の式（１）を満たす、
ことを特徴とする継手金具。
ｔａｎ（θ／２）＜Ｄ１／Ｌ……（１） It is a joint fitting formed by friction welding the one end of the first pipe portion and the end of the second pipe portion.
The inner diameter D2 of the second pipe portion is formed to have a size larger than the inner diameter D1 of the first pipe portion.
The inner diameter of the one end of the first pipe portion is formed by a large inner diameter portion equal to the inner diameter D2 of the second pipe portion.
The portion from the large inner diameter portion toward the other end of the first pipe portion is formed by an inclined surface portion connected to the inner peripheral surface of the inner diameter D1 of the first pipe portion as the inner diameter gradually decreases.
When the distance from the other end to the inclined surface portion is L, and the angle formed by the pair of inclined surfaces located on the diameter of the conical surface formed by the inclined surface portion is θ.
Satisfy the following equation (1),
A joint fitting that is characterized by that.
tan (θ / 2) <D1 / L …… (1) 前記角度θは、０°より大きく、４０°以下である、
ことを特徴とする請求項１に記載の継手金具。 The angle θ is greater than 0 ° and less than or equal to 40 °.
The joint fitting according to claim 1. 前記第１パイプ部は、前記他方の端部側がホースの端部に連結されるニップルとして形成されている、
ことを特徴とする請求項１または２に記載の継手金具。 The first pipe portion is formed as a nipple whose other end side is connected to the end portion of the hose.
The joint fitting according to claim 1 or 2. 前記第２パイプ部の前記摩擦圧接されている端部と反対側の端部に、前記パイプ部本体を機器に着脱可能に結合する口金が設けられている、
ことを特徴とする請求項１〜３のいずれか一項に記載の継手金具。 At the end of the second pipe portion opposite to the end of the second pipe portion which is friction-welded, a mouthpiece is provided to detachably connect the pipe portion main body to the device.
The joint fitting according to any one of claims 1 to 3.
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JPS51131715U (en) * 1975-04-16 1976-10-23
JPS55163385A (en) * 1979-06-05 1980-12-19 Burijisuton Inperiaru Kk Joint metal
JPS563388A (en) * 1979-06-15 1981-01-14 Moore & Co Samuel Hose or tube products with joint and its manufacture
JPS6455496A (en) * 1987-08-25 1989-03-02 Tokai Rubber Ind Ltd Manufacture of hose mouthpiece
GB2322174A (en) * 1997-02-14 1998-08-19 Shand Engineering Limited Hose coupling with swagable ribs
JPH10263851A (en) * 1997-03-21 1998-10-06 Tokai Rubber Ind Ltd Manufacture of tube joint
JP2008075806A (en) * 2006-09-22 2008-04-03 Bridgestone Flowtech Corp Joint and manufacturing method thereof
JP2010014221A (en) * 2008-07-04 2010-01-21 Yokohama Rubber Co Ltd:The Hose joint fitting and manufacturing method therefor
JP2010155265A (en) * 2008-12-26 2010-07-15 Bridgestone Corp Method of welding tubular body, welded pipe made of metal and core metal fitting
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JP2011241910A (en) * 2010-05-19 2011-12-01 Sekisui Chem Co Ltd Pipe joint
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JP2014206243A (en) * 2013-04-15 2014-10-30 横浜ゴム株式会社 Hose fitting attachment method
JP2014228013A (en) * 2013-05-17 2014-12-08 ブリヂストンフローテック株式会社 Hose with metal fittings and method for assembling hose with metal fittings
JP2015202509A (en) * 2014-04-15 2015-11-16 横浜ゴム株式会社 Caulking determination device for caulking device and method for determination of caulking
CN205618852U (en) * 2016-02-24 2016-10-05 江苏斯必得重工机械有限公司 A tail core subassembly for hydraulic equipment

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