JP5218216B2 - Connection joint structure - Google Patents

Connection joint structure Download PDF

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JP5218216B2
JP5218216B2 JP2009085943A JP2009085943A JP5218216B2 JP 5218216 B2 JP5218216 B2 JP 5218216B2 JP 2009085943 A JP2009085943 A JP 2009085943A JP 2009085943 A JP2009085943 A JP 2009085943A JP 5218216 B2 JP5218216 B2 JP 5218216B2
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main body
connection
drop
hole
axial direction
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JP2010236643A (en
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佳則 奥野
淳 近藤
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Denso Corp
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Denso Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/098—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks
    • F16L37/0985—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks the flexible hook extending radially inwardly from an outer part and engaging a bead, recess or the like on an inner part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

本発明は、流体用配管の接続継ぎ手構造に関するもので、インジェクタから排出される低圧燃料の配管の接続部に用いて好適である。 The present invention relates to a connecting joint structure of the fluid pipe is suitable for use in connection of piping of the low pressure fuel discharged from the injector.

従来、流体用配管の接続では、流れの気密性または液密性を保持するために、接続部にシール部材を用いることが知られている。   Conventionally, when connecting fluid pipes, it is known to use a seal member at the connection portion in order to maintain the airtightness or liquidtightness of the flow.

また、ディーゼルエンジン用燃料噴射装置では、インジェクタから低圧燃料が排出される燃料排出口と低圧燃料用の配管との接続のため、その接続部に接続継ぎ手を用いている（例えば特許文献１）。   Moreover, in the fuel injection device for diesel engines, a connection joint is used for a connection portion between the fuel discharge port from which the low-pressure fuel is discharged from the injector and the low-pressure fuel pipe (for example, Patent Document 1).

この従来技術では、シール部材が設けられたインジェクタ側の嵌合部を接続継ぎ手の内周部に圧入させることにより、嵌合部と接続継ぎ手が嵌合されている。さらに、接続継ぎ手に設けられた弾性変形可能な接合板を利用するスナップフィットにて、嵌合部と接続継ぎ手との嵌合状態が維持されている。   In this prior art, the fitting part and the connection joint are fitted by press-fitting the fitting part on the injector side provided with the seal member into the inner peripheral part of the connection joint. Furthermore, the fitting state between the fitting portion and the connection joint is maintained by a snap fit using an elastically deformable joining plate provided on the connection joint.

欧州特許第１３９４４０２号明細書European Patent No. 1394402

しかし、上記従来技術では、シール部材をインジェクタ側の嵌合部に設けると、シール部材が損傷しやすいという問題がある。例えば、インジェクタ側の嵌合部を接続継ぎ手と嵌合させる際において、接続継ぎ手に設けられた接合板の突起部とシール部材との間で噛み込みが起こり、シール部材が損傷してしまう。   However, in the above-described conventional technique, there is a problem that the seal member is easily damaged when the seal member is provided in the fitting portion on the injector side. For example, when the fitting portion on the injector side is fitted with the connection joint, the sealing member is damaged due to biting between the protruding portion of the joining plate provided in the connection joint and the seal member.

上記問題点を解消するために、接続継ぎ手にシール部材を設けることが考えられるが、金型における抜きの関係上、シール部材を保持するシール溝を接続継ぎ手に一体成形する場合には、複雑な金型構造や工作設備が必要となる。その結果、部品単価が高くなるという問題点が新たに発生する。   In order to solve the above problems, it is conceivable to provide a seal member at the connection joint. However, when the seal groove for holding the seal member is formed integrally with the connection joint due to the removal of the mold, it is complicated. A mold structure and machine tool are required. As a result, there arises a new problem that the unit unit price becomes high.

また、別部材を用いてシール部材を保持する場合においては、別部材を保持するための手段が必要となる。その結果、複雑な構成になるという問題が発生する。   Moreover, when holding a sealing member using another member, the means for hold | maintaining another member is needed. As a result, a problem of complicated configuration occurs.

本発明は上記点に鑑みて、接続継ぎ手に設けられたシール部材の脱落を簡素な構成で防止することを目的とする。   The present invention has been made in view of the above points, and it is an object of the present invention to prevent a sealing member provided on a connection joint from falling off with a simple configuration.

上記目的を達成するため、請求項１に記載の発明では、管状の接続対象部材（２５）と、接続対象部材（２５）が接続される接続継ぎ手（２４）とを備え、
接続継ぎ手（２４）は、接続対象部材（２５）が挿入される円柱状の穴（２７）を有する本体（２１）と、穴（２７）に挿入され、穴（２７）の内周部（４４）と接続対象部材（２５）の外周部（４５）とに接触するシール部材（２２）と、穴（２７）に挿入され、シール部材（２２）が穴（２７）の開口部（２８）側へ脱落することを防止する脱落防止部材（２３）とを備え、 脱落防止部材（２３）には、内周部（４４）に向かって突出する複数個の突起部（４８）が形成され、本体（２１）には、複数個の突起部（４８）と係合する複数個の係合部（４２）が形成されており、
接続対象部材（２５）は、外周部（４５）を形成する第１円筒部（３１）と、第１円筒部（３１）よりも大きい径で形成され、第１円筒部（３１）よりも開口部（２８）側に配置された第２円筒部（３４）と、第１円筒部（３１）と第２円筒部（３４）との径の違いにより形成され、脱落防止部材（２３）と接触する段差面（５１）とを有していることを特徴とする。 In order to achieve the above object, the invention according to claim 1 includes a tubular connection object member (25) and a connection joint (24) to which the connection object member (25) is connected,
The connection joint (24) is inserted into the body (21) having a cylindrical hole (27) into which the connection target member (25) is inserted, and the inner periphery (44) of the hole (27). ) And the outer peripheral portion (45) of the connection target member (25), and the seal member (22) is inserted into the hole (27), and the seal member (22) is on the opening (28) side of the hole (27). And a drop-off prevention member (23) for preventing the drop-off, and the drop-off prevention member (23) is formed with a plurality of protrusions (48) protruding toward the inner peripheral portion (44). (21) is formed with a plurality of engaging portions (42) that engage with the plurality of protrusions (48) ,
The connection target member (25) is formed with a first cylindrical part (31) that forms the outer peripheral part (45) and a larger diameter than the first cylindrical part (31), and is more open than the first cylindrical part (31). Formed by the difference in diameter between the second cylindrical portion (34) disposed on the side of the portion (28) and the first cylindrical portion (31) and the second cylindrical portion (34), and comes into contact with the drop-off prevention member (23). It has the level | step difference surface (51) to do, It is characterized by the above-mentioned.

これによると、突起部（４８）と係合部（４２）との係合によって脱落防止部材（２３）をシール部材（２２）よりも穴（２７）の開口部（２８）側に保持できるので、シール部材（２２）が穴（２７）の開口部（２８）側へ脱落することを簡素な構成で防止できる。
また、請求項１に記載の発明によれば、接続対象部材（２５）の第１円筒部（３１）と第２円筒部（３４）との径の違いにより段差面（５１）が形成され、この段差面（５１）に脱落防止部材（２３）が接触するようになっているから、脱落防止部材（２３）が受ける軸方向の内圧を、接続対象部材（２５）が受けることができる。このため、脱落防止部材（２３）と本体（２１）との係合部にかかる燃料等の圧力による負荷を考慮する必要がないので、脱落防止部材（２３）の突起部（４８）の破損・損傷の発生を抑制でき、脱落防止部材（２３）の構造を簡素化できる。 According to this, the drop-off prevention member (23) can be held closer to the opening (28) side of the hole (27) than the seal member (22) by the engagement between the protrusion (48) and the engagement portion (42). It is possible to prevent the sealing member (22) from falling off to the opening (28) side of the hole (27) with a simple configuration.
Further, according to the invention described in claim 1, the step surface (51) is formed by the difference in diameter between the first cylindrical portion (31) and the second cylindrical portion (34) of the connection target member (25), Since the drop-off prevention member (23) comes into contact with the stepped surface (51), the connection target member (25) can receive the internal pressure in the axial direction received by the drop-off prevention member (23). For this reason, since it is not necessary to consider the load due to the pressure of fuel or the like applied to the engaging portion between the drop-off prevention member (23) and the main body (21), the protrusion (48) of the drop-off prevention member (23) is damaged. Generation | occurrence | production of damage can be suppressed and the structure of a drop-off prevention member (23) can be simplified.

請求項２に記載の発明では、請求項1に記載の接続継ぎ手構造において、本体（２１）部の材質は樹脂であることを特徴とする。 The invention according to claim 2 is characterized in that, in the connection joint structure according to claim 1, the material of the main body (21) is a resin.

これによると、本体（２１）が樹脂部材であるので、本体（２１）と脱落防止部材（２３）との係合を、別部品を必要としないスナップフィットによって実現できる。   According to this, since the main body (21) is a resin member, the engagement between the main body (21) and the drop-off preventing member (23) can be realized by a snap fit that does not require a separate part.

請求項３に記載の発明では、請求項１または２に記載の接続継ぎ手構造において、脱落防止部材（２３）は樹脂であることを特徴とする。 The invention according to claim 3 is characterized in that, in the connection joint structure according to claim 1 or 2, the drop-off prevention member (23) is a resin.

これによると、脱落防止部材（２３）が、本体（２１）に対して引っかき傷や塑性変形を発生させるおそれを軽減できるので、脱落防止部材（２３）を本体（２１）に挿入することによって生じる本体（２１）の損傷・破損を抑制することができる。   According to this, the drop-off prevention member (23) can reduce the risk of causing scratches or plastic deformation to the main body (21), and thus is caused by inserting the drop-off prevention member (23) into the main body (21). Damage and breakage of the main body (21) can be suppressed.

請求項４に記載の発明では、請求項１ないし３のいずれか１つに記載の接続継ぎ手構造において、接続対象部材（２５）は、穴（２７）に対する挿入方向の先端部（５０）に口絞り加工が施されていることを特徴とする。 According to a fourth aspect of the present invention, in the connection joint structure according to any one of the first to third aspects, the connection target member (25) has a mouth at a distal end (50) in the insertion direction with respect to the hole (27). It is characterized by being drawn.

これによると、接続対象部材（２５）を挿入するとき、シール部材（２２）に接続対象部材（２５）先端の角部が接触することにより発生する噛み込みを防止することができるので、シール部材（２２）の破損・損傷を防ぐことができる。なお、本発明における口絞り加工とは、円筒の端末を絞り、径を減少させる加工のことをいい、円筒の外径と内径をともに減少させる加工と外径のみを減少させる加工との両方を含む意味である。   According to this, when inserting the connection target member (25), it is possible to prevent biting that occurs when the corner of the tip of the connection target member (25) contacts the seal member (22). Breakage / damage of (22) can be prevented. In addition, the squeezing process in the present invention refers to a process of reducing the diameter by reducing the end of the cylinder, and both the process of reducing both the outer diameter and the inner diameter of the cylinder and the process of reducing only the outer diameter. Including meaning.

請求項５に記載の発明では、請求項１ないし４のいずれか１つに記載の接続継ぎ手構造において、本体（２１）の外側に配置され、穴（２７）の軸方向に移動することで本体（２１）と接続対象部材（２５）とのロックとリリースとを切り替えるカバー（２６）を備え、カバー（２６）には、本体（２１）に向かって軸方向に直交する方向に突出する凸部（５６）が形成され、本体（２１）には、凸部（５６）と係合可能な第１凹部（３９）および第２凹部（４０）が、本体の軸方向における位置が互いに異なるように形成され、カバー（２６）は、凸部（５６）が、第１凹部（３９）と係合している時に本体（２１）と接続対象部材（２５）とをロックし、凸部（５６）が第２凹部（４０）と係合している時に本体（２１）と接続対象部材（２５）とをリリースすることを特徴とする。 According to a fifth aspect of the present invention, in the connection joint structure according to any one of the first to fourth aspects, the main body is disposed outside the main body (21) and moves in the axial direction of the hole (27). A cover (26) for switching between locking and releasing between (21) and the connection object member (25), and the cover (26) projecting in a direction perpendicular to the axial direction toward the main body (21) (56) is formed, and the main body (21) has a first concave portion (39) and a second concave portion (40) engageable with the convex portion (56) so that the positions of the main body in the axial direction are different from each other. The cover (26) is formed, and when the convex portion (56) is engaged with the first concave portion (39), the main body (21) and the connection target member (25) are locked, and the convex portion (56) Is engaged with the second recess (40) and the main body (21) and the connection object member Characterized in that it releases 25) and.

これによると、カバー（２６）の配置位置が、凸部（５６）と第１凹部（３９）または第２凹部（４０）との係合により決まるので、カバー（２６）をロック位置とリリース位置とに確実に移動させることができる。   According to this, since the arrangement position of the cover (26) is determined by the engagement between the convex part (56) and the first concave part (39) or the second concave part (40), the cover (26) is locked and released. And can be moved reliably.

なお、この欄および特許請求の範囲で記載した各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。   In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

本発明の一実施形態における燃料噴射装置の全体構成を示す図である。It is a figure showing the whole fuel injection device composition in one embodiment of the present invention. 一実施形態におけるインジェクタを示す断面図である。It is sectional drawing which shows the injector in one Embodiment. 一実施形態における接続継ぎ手構造について、（ａ）は正面図を示し、（ｂ）は断面図を示す。About the connection joint structure in one Embodiment, (a) shows a front view, (b) shows sectional drawing. 一実施形態における接続継ぎ手構造の分解斜視図である。It is a disassembled perspective view of the connection joint structure in one Embodiment. 一実施形態における脱落防止部材を示す二面図である。It is a double view which shows the drop-off prevention member in one Embodiment. 一実施形態における接続継ぎ手と接続対象部材について（ａ）はロック状態を示す断面図であり、（ｂ）はリリース状態を示す断面図である。(A) is sectional drawing which shows a locked state about the connection joint and connection object member in one Embodiment, (b) is sectional drawing which shows a release state.

図１は本発明の一実施形態における燃料噴射装置の全体構成を示す。図２は図１に示すインジェクタ１の全体構成の断面図を示す。   FIG. 1 shows the overall configuration of a fuel injection device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the overall configuration of the injector 1 shown in FIG.

本実施形態における燃料噴射装置はディーゼル機関に用いられるものである。この燃料噴射装置では、燃料タンク２内の燃料は燃料フィルタ３を介して燃料ポンプ４によって汲み上げられる。燃料ポンプ４によって汲み上げられた燃料は、蓄圧器５に加圧供給された後、高圧で蓄えられ、高圧燃料配管６を介してインジェクタ１に供給される。供給された燃料のうち噴射されなかった余剰燃料は、低圧燃料配管７を介し燃料タンク２に戻すことができる。   The fuel injection device in this embodiment is used for a diesel engine. In this fuel injection device, the fuel in the fuel tank 2 is pumped up by the fuel pump 4 through the fuel filter 3. The fuel pumped up by the fuel pump 4 is pressurized and supplied to the pressure accumulator 5, stored at a high pressure, and supplied to the injector 1 through the high-pressure fuel pipe 6. The surplus fuel that has not been injected among the supplied fuel can be returned to the fuel tank 2 via the low-pressure fuel pipe 7.

インジェクタ１は、図２に示すように、高圧燃料が流れる高圧通路８と低圧燃料が流れる低圧通路９が設けられている。インジェクタ１は、燃料導入口１０より高圧燃料が供給され、燃料排出口１１より低圧燃料が排出される。   As shown in FIG. 2, the injector 1 is provided with a high-pressure passage 8 through which high-pressure fuel flows and a low-pressure passage 9 through which low-pressure fuel flows. The injector 1 is supplied with high-pressure fuel from the fuel inlet 10 and discharges low-pressure fuel from the fuel outlet 11.

インジェクタ１は、アクチュエータ１２に通電されると、油圧式の駆動力伝達部１３が３方弁構造を有する制御弁１４を駆動させ、制御弁室１５を低圧通路９と連結させる。これにより制御室１６の圧力が低下してノズルニードル１７がリフトし、燃料を噴射させる。   In the injector 1, when the actuator 12 is energized, the hydraulic driving force transmission unit 13 drives the control valve 14 having a three-way valve structure, and connects the control valve chamber 15 to the low pressure passage 9. As a result, the pressure in the control chamber 16 is lowered and the nozzle needle 17 is lifted to inject fuel.

図３は本実施形態における接続継ぎ手構造２０の全体構成を示し、（ａ）は正面図であり、（ｂ）は断面図である。図４は図３の接続継ぎ手構造２０の分解斜視図を示す。   FIG. 3 shows the overall configuration of the connection joint structure 20 in the present embodiment, where (a) is a front view and (b) is a cross-sectional view. 4 shows an exploded perspective view of the connection joint structure 20 of FIG.

図１に示す燃料噴出装置において、インジェクタ１と低圧燃料配管７との接続部には、図３、図４に示す接続継ぎ手構造２０が用いられている。この接続継ぎ手構造２０は、本体２１とシール部材２２と脱落防止部材２３とからなる接続継ぎ手２４と、接続対象部材２５と、カバー２６とにより構成される。   In the fuel injection device shown in FIG. 1, a connection joint structure 20 shown in FIGS. 3 and 4 is used at a connection portion between the injector 1 and the low-pressure fuel pipe 7. The connection joint structure 20 includes a connection joint 24 including a main body 21, a seal member 22, and a drop-off prevention member 23, a connection target member 25, and a cover 26.

略円筒状に伸びる胴体部を有する本体２１には、軸方向一方側より円柱状の穴２７が設けられ、穴２７にシール部材２２と脱落防止部材２３とが挿入されている。   A main body 21 having a body portion extending in a substantially cylindrical shape is provided with a columnar hole 27 from one side in the axial direction, and a seal member 22 and a drop-off prevention member 23 are inserted into the hole 27.

本体２１は、樹脂で成形される。本体２１に形成される穴２７は非貫通穴であり、開口部２８側である軸方向一方側から軸方向他方側に向かうにつれて、内径は小さくなっている。   The main body 21 is molded from resin. The hole 27 formed in the main body 21 is a non-through hole, and the inner diameter becomes smaller from the one axial side on the opening 28 side toward the other axial side.

穴２７は、３つに大別され、第１非貫通穴３０は低圧燃料の流路とされるとともに、接続対象部材２５に設けられる第１円筒部３１の挿入方向先端部が収められる。第２非貫通穴３２にはシール部材２２と脱落防止部材２３とが収められ、第３非貫通穴３３には接続対象部材２５の第２円筒部３４が収められている。   The hole 27 is roughly divided into three, and the first non-through hole 30 is used as a flow path for low-pressure fuel, and the distal end portion in the insertion direction of the first cylindrical portion 31 provided in the connection target member 25 is accommodated. The seal member 22 and the drop-off preventing member 23 are accommodated in the second non-through hole 32, and the second cylindrical portion 34 of the connection target member 25 is accommodated in the third non-through hole 33.

本体２１は、切欠き３５が軸方向一方側の端部より円周４等分で設けられ、その周方向に分離した４つの爪部３６が形成されている。爪部３６の軸方向一方側の先端には、内周に向かって突出している突起３６ａを有する。また、本体２１の外周には、テーパ状の溝で形成された円周溝が設けられている。切欠き３５は、軸方向一方側よりこの円周溝近傍まで形成されている。 The main body 21 is provided with a notch 35 divided into four equal circumferences from the end on one axial side, and four claw portions 36 separated in the circumferential direction are formed. A projection 36a that protrudes toward the inner periphery is provided at the tip of one side of the claw portion 36 in the axial direction. In addition, a circumferential groove formed by a tapered groove is provided on the outer periphery of the main body 21. The notch 35 is formed from one side in the axial direction to the vicinity of the circumferential groove.

本体２１の軸方向他方側には、低圧燃料配管７を接続するための差込部３７が２つ設けられている。この２つの差込部３７は、本体２１の軸方向に直交する方向へ互いに反対方向へ突出されている。２つの差込部３７にはそれぞれ流路３８が形成されている。この２つの流路３８は、図３（ｂ）に図示されているように第１非貫通穴３０と交差するように形成され、この第１非貫通穴３０を介して２つの流路３８は本体２１を貫通している。 Two insertion portions 37 for connecting the low-pressure fuel pipe 7 are provided on the other axial side of the main body 21. The two insertion portions 37 protrude in directions opposite to each other in a direction orthogonal to the axial direction of the main body 21. A flow path 38 is formed in each of the two insertion portions 37. The two flow paths 38 are formed so as to intersect the first non-through holes 30 as shown in FIG. 3B , and the two flow paths 38 are formed via the first non-through holes 30. It penetrates the main body 21 .

そして、本体２１の軸方向他方側における外周には、後述するカバー２６の凸部５６と係合する２つの第１凹部３９が円周２等分される位置に設けられる。さらに、第１凹部３９より軸方向一方側には、２つの第２凹部４０がそれぞれ設けられる。第２凹部４０の左右には、軸方向へ伸びるガイド４１が設けられている。 Then, on the outer periphery on the other side in the axial direction of the main body 21, two first concave portions 39 that engage with convex portions 56 of the cover 26 described later are provided at positions where the circumference is equally divided. Further, two second recesses 40 are provided on one side in the axial direction from the first recess 39. Guides 41 extending in the axial direction are provided on the left and right sides of the second recess 40.

また、本体２１には、本体２１の外周より穴２７まで貫通している係合部４２が周方向に円周４等分で配設され、係合部４２は、上記円周溝の軸方向他方側に設けられる。係合部４２は、脱落防止部材２３と係合される。   In addition, the main body 21 is provided with an engagement portion 42 penetrating from the outer periphery of the main body 21 to the hole 27 in the circumferential direction equally divided into four equal parts, and the engagement portion 42 is arranged in the axial direction of the circumferential groove. Provided on the other side. The engaging part 42 is engaged with the drop-off preventing member 23.

シール部材２２は、本実施形態では、Ｏリングである。シール部材２２は、第１非貫通穴３０と第２非貫通穴３２とで形成された本体内の段差４３の軸方向一方側に設けられる。シール部材２２は、穴２７の内周部４４と接続対象部材２５の外周部４５とに接触される。   In this embodiment, the seal member 22 is an O-ring. The seal member 22 is provided on one side in the axial direction of the step 43 in the main body formed by the first non-through hole 30 and the second non-through hole 32. The seal member 22 is in contact with the inner peripheral portion 44 of the hole 27 and the outer peripheral portion 45 of the connection target member 25.

図５は図３、図４の脱落防止部材２３の二面図を示す。脱落防止部材２３は、樹脂で成形されている。脱落防止部材２３は、小径断面部４６と大径断面部４７を有する環状で、小径断面部４６より軸方向へストレートで形成された後、テーパ状に大径断面部４７まで拡大されて形成されている。   FIG. 5 shows two views of the drop-off preventing member 23 shown in FIGS. The drop-off prevention member 23 is formed of resin. The drop-off prevention member 23 has an annular shape having a small-diameter cross-section portion 46 and a large-diameter cross-section portion 47, and is formed straight from the small-diameter cross-section portion 46 in the axial direction, and then is tapered to the large-diameter cross-section portion 47. ing.

脱落防止部材２３は、小径断面部４６が本体２１へ挿入される先端部となる。脱落防止部材２３の大径断面部４７側には、径方向へ突出している突起部４８が等間隔に４つ設けられている。脱落防止部材２３は、シール部材２２の軸方向一方側に設けられ、突起部４８は、本体２１に設けられた係合部４２と係合される。   The drop-off prevention member 23 serves as a tip portion into which the small-diameter cross-sectional portion 46 is inserted into the main body 21. On the large-diameter cross-section 47 side of the drop-off prevention member 23, four protrusions 48 protruding in the radial direction are provided at equal intervals. The drop-off prevention member 23 is provided on one side in the axial direction of the seal member 22, and the protrusion 48 is engaged with an engagement portion 42 provided on the main body 21.

接続対象部材２５は、ステンレス鋼により形成されている。図３、図４に示すように、接続対象部材２５は、第１円筒部３１と第２円筒部３４と接合部４９とで形成され、挿入方向の先端が第１円筒部３１、挿入方向の後端が接合部４９、挿入方向の中間部が第２円筒部３４になっている。第１円筒部３１および第２円筒部３４は、接続継ぎ手２４の本体２１の穴２７内に挿入され、接合部４９はねじ、圧入、樹脂溶着、溶接等によりインジェクタ１と接合される。
接続対象部材２５は、本体２１の軸方向一方側より穴２７内に挿入される。第１円筒部３１は、接続継ぎ手２４に設けられたシール部材２２に圧入される。また、第１円筒部３１の挿入方向の先端部５０には、口絞り加工が施されて曲面部５９が形成されている。なお、口絞り加工とは、円筒の端末を絞り、径を減少させる加工のことをいい、本明細書では、円筒の外径と内径をともに減少させる加工と外径のみを減少させる加工との両方を含む意味である。 The connection target member 25 is made of stainless steel. As shown in FIGS . 3 and 4 , the connection target member 25 is formed by the first cylindrical portion 31, the second cylindrical portion 34, and the joint portion 49, and the distal end in the insertion direction is the first cylindrical portion 31, The rear end is the joint portion 49 and the intermediate portion in the insertion direction is the second cylindrical portion 34. The first cylindrical portion 31 and the second cylindrical portion 34 are inserted into the hole 27 of the main body 21 of the connection joint 24 , and the joint portion 49 is joined to the injector 1 by screws, press fitting, resin welding, welding, or the like.
The connection target member 25 is inserted into the hole 27 from one side in the axial direction of the main body 21. The first cylindrical portion 31 is press-fitted into the seal member 22 provided at the connection joint 24. Further, the distal end portion 50 in the insertion direction of the first cylindrical portion 31 is subjected to mouth drawing processing to form a curved surface portion 59. Note that the squeezing process refers to a process of reducing the diameter by reducing the diameter of the cylindrical end. In this specification, the process of reducing both the outer diameter and the inner diameter of the cylinder and the process of reducing only the outer diameter. It means to include both.

第２円筒部３４は、第１円筒部３１より大きい径で形成されている。これにより、第２円筒部３４の第１円筒部３１側端面には、段差面５１が形成されている。また、第２円筒部３４は、爪部３６とスナップフィット結合され、第２円筒部３４の外周部５２は、爪部３６の内周と接触される。また、段差面５１は脱落防止部材２３の大径断面部４７と接触する。   The second cylindrical portion 34 is formed with a larger diameter than the first cylindrical portion 31. Thereby, a step surface 51 is formed on the end surface of the second cylindrical portion 34 on the first cylindrical portion 31 side. The second cylindrical portion 34 is snap-fit coupled to the claw portion 36, and the outer peripheral portion 52 of the second cylindrical portion 34 is in contact with the inner periphery of the claw portion 36. Further, the step surface 51 is in contact with the large-diameter cross-sectional portion 47 of the drop-off preventing member 23.

接続継ぎ手２４に取り付けられるカバー２６は、樹脂により略円筒状に成形される。カバー２６の軸方向他方部には、互いに対向した２つの板状爪部５３が軸方向に伸びて形成されている。   The cover 26 attached to the connection joint 24 is formed into a substantially cylindrical shape with resin. Two plate-like claw portions 53 facing each other are formed on the other axial portion of the cover 26 so as to extend in the axial direction.

板状爪部５３は、軸方向他方側に向かってＵ字状に切抜き部５４が形成されている。切抜き部５４に囲まれた板部５５の軸方向他方側の先端部には、内周に向かって凸部５６が形成されている。この凸部５６は、カバー２６が軸方向へ移動することにより、本体２１に設けられた第１凹部３９または第２凹部４０に係合される。また、軸方向に伸びる切抜き部５４は、本体２１のガイド４１に対応するガイド溝として用いられる。   The plate-like claw 53 has a U-shaped cutout 54 formed toward the other side in the axial direction. A convex portion 56 is formed toward the inner periphery of the tip portion on the other axial side of the plate portion 55 surrounded by the cutout portion 54. The convex portion 56 is engaged with the first concave portion 39 or the second concave portion 40 provided in the main body 21 when the cover 26 moves in the axial direction. Further, the cutout portion 54 extending in the axial direction is used as a guide groove corresponding to the guide 41 of the main body 21.

図６（ａ）は接続継ぎ手２４と接続対象部材２５とのロック状態を示す断面図であり、図６（ｂ）はリリース状態を示す断面図である。   6A is a cross-sectional view showing a locked state of the connection joint 24 and the connection target member 25, and FIG. 6B is a cross-sectional view showing a released state.

カバー２６は、図６（ａ）で示すように、凸部５６が第１凹部３９と係合された時には、カバー２６の軸方向一方側の縁部５７が爪部３６に当接するように形成されている。これにより、本体２１と接続対象部材２５とをロック状態にすることができる。   As shown in FIG. 6A, the cover 26 is formed so that the edge 57 on one side in the axial direction of the cover 26 contacts the claw 36 when the projection 56 is engaged with the first recess 39. Has been. Thereby, the main body 21 and the connection object member 25 can be made into a locked state.

また、カバー２６は、図６（ｂ）で示すように、凸部５６が第２凹部４０と係合された時には、縁部５７が爪部３６に当接しないように形成されている。これにより、本体２１と接続対象部材２５とをリリース状態にすることができる。   Further, as shown in FIG. 6B, the cover 26 is formed so that the edge portion 57 does not come into contact with the claw portion 36 when the convex portion 56 is engaged with the second concave portion 40. Thereby, the main body 21 and the connection object member 25 can be made into a release state.

カバー２６の軸方向他方側の先端部近傍には、板状のフィンガ部５８が、互いに反対方向に伸びて形成されている。フィンガ部５８は、カバー２６を容易に軸方向へ移動させるための、例えば指を引っ掛けるものとして用いられる。   In the vicinity of the tip of the cover 26 on the other side in the axial direction, a plate-like finger portion 58 is formed to extend in opposite directions. The finger portion 58 is used, for example, as a finger hook for easily moving the cover 26 in the axial direction.

上記構成によると、脱落防止部材２３に設けられた突起部４８が本体２１に設けられた係合部４２と係合されているので、脱落防止部材２３が本体２１に保持される。これにより、接続対象部材２５を接続継ぎ手２４から取外す際、脱落防止部材２３が接続対象部材２５と一緒に軸方向一方側へ脱落することを防止できる。   According to the above configuration, the protrusion 48 provided on the drop-off prevention member 23 is engaged with the engagement portion 42 provided on the main body 21, so that the drop-off prevention member 23 is held by the main body 21. Thereby, when removing the connection object member 25 from the connection joint 24, it is possible to prevent the drop-off prevention member 23 from dropping to the one side in the axial direction together with the connection object member 25.

また、シール部材２２は、段差４３と脱落防止部材２３との間に設けられる。つまり、脱落防止部材２３が本体２１に保持されている場合、シール部材２２も本体２１に保持される。これにより、シール部材２２が軸方向一方側へ脱落することを防止でき、接続対象部材２５を接続継ぎ手２４から取外す際においても、シール部材２２が軸方向一方側へ脱落することを防止できる。   The seal member 22 is provided between the step 43 and the drop-off preventing member 23. That is, when the drop prevention member 23 is held by the main body 21, the seal member 22 is also held by the main body 21. Thereby, it is possible to prevent the seal member 22 from dropping to one side in the axial direction, and it is possible to prevent the seal member 22 from dropping to one side in the axial direction even when the connection target member 25 is removed from the connection joint 24.

本体２１を樹脂で成形することにより、本体２１と脱落防止部材２３との係合が別部品を必要としないスナップフィットにより実現することができる。また、脱落防止部材２３を樹脂で成形することにより、脱落防止部材２３が、本体２１に対して引っかき傷や塑性変形を発生させるおそれを軽減できるので、管路接続における気密性または液密性を良好に保持できる。   By molding the main body 21 with resin, the engagement between the main body 21 and the drop-off prevention member 23 can be realized by a snap fit that does not require a separate part. Further, by molding the drop-off prevention member 23 with resin, the drop-off prevention member 23 can reduce the possibility of causing scratches and plastic deformation to the main body 21, so that the airtightness or liquid tightness in the pipe connection can be reduced. It can be held well.

そして、接続対象部材２５に設けられた段差面５１が、脱落防止部材２３の大径断面部４７と接触することにより、脱落防止部材２３が受ける流路内の流体が及ぼす内圧を接続対象部材２５にて負荷することができるので、脱落防止部材２３と本体２１との係合部にかかる負荷を考慮する必要がなくなる。これにより、脱落防止部材２３の突起部４８の破損・損傷の発生を抑制することができ、脱落防止部材２３の構造を簡素化できる。   Then, the stepped surface 51 provided on the connection target member 25 comes into contact with the large-diameter cross-sectional portion 47 of the dropout prevention member 23, whereby the internal pressure exerted by the fluid in the flow path received by the dropout prevention member 23 is applied. Therefore, it is not necessary to consider the load applied to the engaging portion between the drop-off prevention member 23 and the main body 21. Thereby, generation | occurrence | production of the damage and damage of the projection part 48 of the drop-off prevention member 23 can be suppressed, and the structure of the drop-off prevention member 23 can be simplified.

さらに、接続対象部材２５の挿入方向の先端部５０に口絞り加工を施すことにより、シール部材２２へ接続対象部材２５が圧入される際、口絞り加工により形成された曲面部５９がシール部材２２に接触するので、第１円筒部３１とシール部材２２との噛み込みを防止することができる。その結果、シール部材２２の損傷による気密性または液密性の効果の低下を抑制することができる。   Further, by subjecting the distal end portion 50 in the insertion direction of the connection target member 25 to a mouth drawing process, when the connection target member 25 is press-fitted into the seal member 22, the curved surface portion 59 formed by the mouth drawing process becomes the seal member 22. Therefore, the biting between the first cylindrical portion 31 and the seal member 22 can be prevented. As a result, it is possible to suppress a decrease in the effect of airtightness or liquidtightness due to damage to the seal member 22.

また、従来、配管を流れる燃料が及ぼす圧力脈動のピーク圧を緩和するために、流路径の絞り機構を用いることが一般的に行われているが、本実施形態では、絞り機構を用いる代わりに、接続対象部材２５に絞り加工を施している。   Conventionally, in order to alleviate the peak pressure of pressure pulsation exerted by the fuel flowing in the pipe, it has been generally used a throttling mechanism for the channel diameter, but in this embodiment, instead of using the throttling mechanism The connection target member 25 is drawn.

すなわち、接続対象部材２５には、燃料の流れる方向に対して流路を絞る口絞り加工が施されているので、接続対象部材２５より下流にある部材の圧力脈動を低減でき、部材への負荷を軽減でき、破損・損傷の発生を抑制することができる。なお、接続対象部材２５より下流にある部材とは、本体２１や低圧燃料配管７等をさす。   In other words, since the connection target member 25 is subjected to a mouth drawing process for restricting the flow path in the fuel flow direction, pressure pulsation of a member downstream from the connection target member 25 can be reduced, and the load on the member is reduced. Can be reduced, and the occurrence of breakage and damage can be suppressed. The member downstream from the connection target member 25 refers to the main body 21, the low-pressure fuel pipe 7, and the like.

さらに、本体２１と接続対象部材２５とのロック状態またはリリース状態の切り替えは、カバー２６を軸方向に移動させ、凸部５６と第１凹部３９または第２凹部４０とを係合させて行うので、カバー２６を確実にロック位置とリリース位置とに移動させることができる。   Further, switching between the locked state or the released state between the main body 21 and the connection target member 25 is performed by moving the cover 26 in the axial direction and engaging the convex portion 56 with the first concave portion 39 or the second concave portion 40. The cover 26 can be reliably moved to the lock position and the release position.

（他の実施形態）
なお、上記一実施形態では、接続継ぎ手２４をインジェクタ１と低圧燃料配管７との接続部に用いているが、接続継ぎ手２４を種々の配管接続部に用いることができる。 (Other embodiments)
In the above-described embodiment, the connection joint 24 is used for the connection portion between the injector 1 and the low-pressure fuel pipe 7, but the connection joint 24 can be used for various pipe connection portions.

また、上記一実施形態では、脱落防止部材２３は環状になっているが、脱落防止部材２３は環状に限られず、Ｃ型等の形状であってもよい。   Further, in the above-described embodiment, the dropout prevention member 23 is annular, but the fallout prevention member 23 is not limited to an annular shape, and may be a C shape or the like.

また、上記一実施形態では、脱落防止部材２３は軸方向にテーパ状に形成されているが、単純な円筒状であってもよい。   Moreover, in the said one Embodiment, although the drop-off prevention member 23 is formed in the taper shape in the axial direction, a simple cylindrical shape may be sufficient.

また、上記一実施形態では、脱落防止部材２３に突起部４８が４つ設けられているが、突起部４８は４つに限られず、２つ以上あればよい。   Moreover, in the said one embodiment, although the four protrusion parts 48 are provided in the drop-off prevention member 23, the protrusion part 48 is not restricted to four, What is necessary is just two or more.

また、上記一実施形態では、本体２１に設けられている係合部４２は貫通されているが、簡単に形成できる窪みであってもよい。   Moreover, in the said one Embodiment, although the engaging part 42 provided in the main body 21 is penetrated, the hollow which can be formed easily may be sufficient.

また、上記一実施形態では、第１非貫通穴３０と第２非貫通穴３２とで段差４３が設けられているが、第１非貫通穴３０と第２非貫通穴３２をテーパ面で繋げてもよい。   In the above embodiment, the step 43 is provided between the first non-through hole 30 and the second non-through hole 32. However, the first non-through hole 30 and the second non-through hole 32 are connected by a tapered surface. May be.

また、上記一実施形態では、本体２１および脱落防止部材２３の材質を樹脂にしているが、樹脂に限られず、樹脂以外であってもよい。   Moreover, in the said one Embodiment, although the material of the main body 21 and the drop-off prevention member 23 is resin, it is not restricted to resin, Other than resin may be sufficient.

また、上記一実施形態では、接続対象部材２５は段差面５１を有しているが、段差面を有さない円筒状であってもよい。   Moreover, in the said one Embodiment, although the connection object member 25 has the level | step difference surface 51, the cylindrical shape which does not have a level | step difference surface may be sufficient.

また、上記一実施形態では、接続対象部材２５の挿入方向の先端部５０に口絞り加工を施しているが、口絞り加工を施したものに限られず、単純な円筒状であってもよい。   Moreover, in the said one Embodiment, although the aperture drawing process is performed to the front-end | tip part 50 of the insertion direction of the connection object member 25, it is not restricted to what performed the aperture drawing process, A simple cylindrical shape may be sufficient.

また、上記一実施形態では、低圧燃料配管７が接続される差込部３７は２つ設けられているが、差込部３７は１つであってもよい。   Moreover, in the said one Embodiment, although the two insertion parts 37 to which the low pressure fuel piping 7 is connected are provided, the one insertion part 37 may be sufficient.

また、上記一実施形態では、接続対象部材２５はステンレス鋼により形成されているが、接続対象部材２５は炭素鋼で形成されてもよい。   Moreover, in the said one Embodiment, although the connection object member 25 is formed with stainless steel, the connection object member 25 may be formed with carbon steel.

２１ 本体
２２ シール部材
２３ 脱落防止部材
２５ 接続対象部材
２６ カバー
２７ 穴
２８ 開口部
３１ 第１円筒部
４４ 内周部
４５ 外周部 DESCRIPTION OF SYMBOLS 21 Main body 22 Seal member 23 Drop-off prevention member 25 Connection object member 26 Cover 27 Hole 28 Opening part 31 1st cylindrical part 44 Inner peripheral part 45

Claims (5)

管状の接続対象部材（２５）と、前記接続対象部材（２５）が接続される接続継ぎ手（２４）とを備え、
前記接続継ぎ手（２４）は、前記接続対象部材（２５）が挿入される円柱状の穴（２７）を有する本体（２１）と、
前記穴（２７）に挿入され、前記穴（２７）の内周部（４４）と前記接続対象部材（２５）の外周部（４５）とに接触するシール部材（２２）と、
前記穴（２７）に挿入され、前記シール部材（２２）が前記穴（２７）の開口部（２８）側へ脱落することを防止する脱落防止部材（２３）とを備え、
前記脱落防止部材（２３）には、前記内周部（４４）に向かって突出する複数個の突起部（４８）が形成され、
前記本体（２１）には、前記複数個の突起部（４８）と係合する複数個の係合部（４２）が形成されており、
前記接続対象部材（２５）は、
前記外周部（４５）を形成する第１円筒部（３１）と、
前記第１円筒部（３１）よりも大きい径で形成され、前記第１円筒部（３１）よりも前記開口部（２８）側に配置された第２円筒部（３４）と、
前記第１円筒部（３１）と前記第２円筒部（３４）との径の違いにより形成され、前記脱落防止部材（２３）と接触する段差面（５１）とを有していることを特徴とする接続継ぎ手構造。 A tubular connection target member (25), and a connection joint (24) to which the connection target member (25) is connected;
The connection joint (24) includes a main body (21) having a cylindrical hole (27) into which the connection target member (25) is inserted;
A seal member (22) inserted into the hole (27) and in contact with the inner periphery (44) of the hole (27) and the outer periphery (45) of the connection target member (25);
A drop-off prevention member (23) inserted into the hole (27) and preventing the seal member (22) from dropping off toward the opening (28) of the hole (27);
The drop-off prevention member (23) is formed with a plurality of protrusions (48) protruding toward the inner periphery (44),
The main body (21) is formed with a plurality of engaging portions (42) that engage with the plurality of protrusions ( 48 ) ,
The connection object member (25)
A first cylindrical part (31) forming the outer peripheral part (45);
A second cylindrical portion (34) formed with a diameter larger than that of the first cylindrical portion (31) and disposed closer to the opening (28) than the first cylindrical portion (31) ;
A step surface (51) formed by a difference in diameter between the first cylindrical portion (31) and the second cylindrical portion (34) and in contact with the drop-off preventing member (23) is provided. And connecting joint structure . 前記本体（２１）の材質は樹脂であることを特徴とする請求項１に記載の接続継ぎ手構造。 The connection joint structure according to claim 1, wherein a material of the main body (21) is resin. 前記脱落防止部材（２３）の材質は樹脂であることを特徴とする請求項１または２に記載の接続継ぎ手構造。 The connection joint structure according to claim 1 or 2, wherein a material of the drop-off prevention member (23) is resin. 前記接続対象部材（２５）は、前記穴（２７）に対する挿入方向の先端部（５０）に口絞り加工が施されていることを特徴とする請求項１ないし３のいずれか１つに記載の接続継ぎ手構造。 The said connection object member (25) is squeezed in the front-end | tip part (50) of the insertion direction with respect to the said hole (27), The one of Claim 1 thru | or 3 characterized by the above-mentioned. Connection joint structure. 前記本体（２１）の外側に配置され、前記穴（２７）の軸方向に移動することで前記本体（２１）と前記接続対象部材（２５）とのロックとリリースとを切り替えるカバー（２６）を備え、
前記カバー（２６）には、前記本体（２１）に向かって前記軸方向に直交する方向に突出する凸部（５６）が形成され、
前記本体（２１）には、前記凸部（５６）と係合可能な第１凹部（３９）および第２凹部（４０）が、前記軸方向における位置が互いに異なるように形成され、
前記カバー（２６）は、前記凸部（５６）が、第１凹部（３９）と係合している時に前記本体（２１）と前記接続対象部材（２５）とをロックし、前記凸部（５６）が第２凹部（４０）と係合している時に前記本体（２１）と前記接続対象部材（２５）とをリリースすることを特徴とする請求項１ないし４のいずれか１つに記載の接続継ぎ手構造。 A cover (26) that is disposed outside the main body (21) and switches between locking and releasing between the main body (21) and the connection target member (25) by moving in the axial direction of the hole (27). Prepared,
The cover (26) is formed with a convex portion (56) protruding in a direction perpendicular to the axial direction toward the main body (21),
The main body (21) is formed with a first concave portion (39) and a second concave portion (40) that can engage with the convex portion (56) so that positions in the axial direction are different from each other.
The cover (26) locks the main body (21) and the connection target member (25) when the convex portion (56) is engaged with the first concave portion (39), and the convex portion ( 56) described in any one of claims 1 to 4, characterized in that to release the body (21) and said connection object member (25) when engaged with the second recess (40) Connection fitting structure.
JP2009085943A 2009-03-31 2009-03-31 Connection joint structure Expired - Fee Related JP5218216B2 (en)

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US5609370A (en) * 1994-12-02 1997-03-11 Itt Corporation Positive latch quick connector
JPH1113974A (en) * 1997-06-23 1999-01-22 Sekisui Chem Co Ltd Pipe joint
JP3718845B2 (en) * 1997-11-11 2005-11-24 東海ゴム工業株式会社 Quick connector and its holding member
JP3871885B2 (en) * 2001-01-09 2007-01-24 三桜工業株式会社 Fitting for piping
JP2003004188A (en) * 2001-06-20 2003-01-08 Denso Corp Assembly structure for male and female member
JP4000884B2 (en) * 2002-03-29 2007-10-31 東海ゴム工業株式会社 Quick connector
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JP2004301289A (en) * 2003-03-31 2004-10-28 Tokai Rubber Ind Ltd Quick connector
JP2004353520A (en) * 2003-05-28 2004-12-16 Mitsubishi Electric Corp Fuel-injection system
JP2006322561A (en) * 2005-05-19 2006-11-30 Denso Corp Pipe connection structure

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