JP2014037055A - Fuel injection valve and combination method of two components - Google Patents
Fuel injection valve and combination method of two components Download PDFInfo
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Abstract
Description
本発明は、2部品を位置出しして結合する方法、及びこれを利用した燃料噴射弁に関する。 The present invention relates to a method for positioning and joining two parts, and a fuel injection valve using the method.
複数部材からなる部品の同芯結合方法として、特公平7−10471号公報(特許文献1)に記載された方法が知られている。特許文献1の第1図において、ノズル本体(外筒状部品)10のオリフィス11が設けられた内底にテーパ孔(弁シート)10cを形成し、このノズル本体10内に貫通孔12a付きのスワラー(内筒状部品)12をクリアランスを確保しつつ設置し、位置決め用ガイドピン14でテーパ孔10cとスワラー12の貫通孔12aの芯出しをしたまま、パンチ16でスワラー12とノズル本体10の嵌合部近傍(スワラー12側)を局部的塑性流動が生じるよう押圧し、この塑性流動の力により両部品を同芯状に塑性結合させるものであった。 A method described in Japanese Patent Publication No. 7-10471 (Patent Document 1) is known as a concentric coupling method for components composed of a plurality of members. In FIG. 1 of Patent Document 1, a taper hole (valve seat) 10 c is formed in the inner bottom of the nozzle body (outer cylindrical part) 10 provided with the orifice 11, and a through hole 12 a is provided in the nozzle body 10. The swirler (inner cylindrical part) 12 is installed while ensuring the clearance, and the punching 16 is used to position the swirler 12 and the nozzle body 10 while the taper hole 10c and the through hole 12a of the swirler 12 are centered by the positioning guide pin 14. The vicinity of the fitting portion (swirler 12 side) was pressed so that local plastic flow was generated, and both parts were plastically connected concentrically by the force of this plastic flow.
また、特許第3931143号公報(特許文献2)に記載された方法も知られている。 A method described in Japanese Patent No. 3931143 (Patent Document 2) is also known.
特許文献2では、特許文献1に加えてノズル本体10の底面に突起10dを設け、スワラー12が突起10dに食込むことにより径方向のずれを機械的に抑え、同軸度が悪化するのを防止するものであった。 In Patent Document 2, a protrusion 10d is provided on the bottom surface of the nozzle body 10 in addition to Patent Document 1, and the swirler 12 bites into the protrusion 10d to mechanically suppress the radial deviation and prevent the coaxiality from deteriorating. It was something to do.
特許文献1において、塑性流動の力でスワラーとノズル本体を同芯状に結合させる際、スワラー内外径の同軸度が0、且つノズル本体の内径とテーパ孔の同軸度が0であれば、ノズル内径とスワラー外径のクリアランスが全周均一になる。しかし、ノズルとスワラーのいずれか一方でも同軸度が0でない場合は、ノズル内径とスワラー外径のクリアランスが不均一になるため、結合時に発生する応力はクリアランスの小さい側が大きく、軸対象となるクリアランスの大きい側が小さくなる。このため結合後にガイドピンを取り外すと、残留力が全周均一になるようにスプリングバックが発生する。つまり、クリアランスの小さい方から大きい方へスワラーが動き、テーパ孔とスワラー内径の同軸ずれが発生する。また、その量は部品の同軸度精度に影響されるものであり、ずれ量が規定値以上になると可動弁のスムーズな動作を阻害したり、最悪はシート部から燃料洩れが発生する。 In Patent Document 1, when the swirler and the nozzle body are concentrically coupled by the force of plastic flow, if the coaxiality of the inner and outer diameters of the swirler is 0 and the coaxiality of the inner diameter of the nozzle body and the tapered hole is 0, the nozzle Clearance between inner diameter and swirler outer diameter is uniform all around. However, if the concentricity of either the nozzle or the swirler is not 0, the clearance between the nozzle inner diameter and the swirler outer diameter will be non-uniform, so the stress generated at the time of coupling will be larger on the side where the clearance is smaller, so The larger side becomes smaller. For this reason, when the guide pin is removed after the coupling, the spring back is generated so that the residual force is uniform over the entire circumference. That is, the swirler moves from the smaller clearance to the larger clearance, and a coaxial shift occurs between the tapered hole and the inner diameter of the swirler. In addition, the amount is influenced by the accuracy of the coaxiality of the parts. When the deviation amount exceeds a specified value, the smooth operation of the movable valve is hindered, and in the worst case, fuel leakage occurs from the seat portion.
一方、特許文献2においては、スワラー12を突起10dに食込ませることで特公平7−10471号公報の問題点の改善を図っている。しかし、図3のパンチ15の先端に設けた突起15aによりスワラー12の上端面外周近傍を押圧し、塑性結合すると、特許文献1と同じようにスワラー12の押圧側に部品精度の影響でスプリングバックが発生し、スワラー内径部12aが傾き、同軸度が悪化する可能性がある。 On the other hand, in Patent Document 2, the problem of Japanese Patent Publication No. 7-10471 is improved by biting the swirler 12 into the protrusion 10d. However, when the vicinity of the outer periphery of the upper surface of the swirler 12 is pressed by the protrusion 15a provided at the tip of the punch 15 in FIG. 3 and is plastically coupled, the spring back is exerted on the pressing side of the swirler 12 due to the accuracy of the parts as in Patent Document 1. May occur, the swirler inner diameter portion 12a may be inclined, and the coaxiality may be deteriorated.
以上のように、従来の技術では結合後のスワラー内径とシート面の同軸度は部品精度に影響され、各部品をそれぞれ高精度に加工しないと高精度に組み立てできないため、加工コストが高いばかりかシート部からの燃料洩れや可動弁の動作に悪影響を及ぼすという課題があった。 As described above, with the conventional technology, the swirler inner diameter after joining and the coaxiality of the seat surface are affected by the component accuracy, and each component cannot be assembled with high accuracy unless it is processed with high accuracy. There was a problem that fuel leakage from the seat part and the operation of the movable valve were adversely affected.
本発明の目的は、部品単品の精度の影響を受けにくく、結合後の同軸度を高精度に保つことができる2部品の結合方法、及びこれを利用した油密性に優れ、可動弁を高精度にガイドできる燃料噴射弁を提供することにある。 It is an object of the present invention to provide a two-part joining method that is not easily affected by the precision of individual parts and that can maintain a high degree of coaxiality after joining, and has excellent oil-tightness using the two parts, and has a high movable valve. An object of the present invention is to provide a fuel injection valve capable of guiding with high accuracy.
上記目的を達成するために本発明では、結合する2部品のうち、位置決めの必要なお互いの部分を治具で位置決めした状態で、硬い方の部材に設けた角部で軟らかい方の部材をせん断加工し、かつ、せん断しながら角部の側面と軟らかい部品のせん断された面とを嵌合させ、続いて2部品の嵌合面を塑性結合や圧入、または溶接して結合し、前記嵌合面で結合し、硬い方の部材が内面に複数段の段部と内底の中心部にストレート部のある穴とを有する底付きの外筒状部品であり、軟らかい方の部材が中心に貫通孔を有する内筒状部品であり、内筒状部品を外筒状部品の複数段の段部に載置した状態で、内筒状部品の貫通孔に位置決め用のガイドピンを外筒状部品の前記穴のストレート部でガイドされるまで挿入して、内筒状部品と外筒状部品の同芯的な仮位置決めを行い、内筒状部品を押圧することにより外筒状部品の複数段の段部に食い込ませ、複数段の段部のうち少なくとも一つの段部の側面に発生する残留応力である自緊力により、内筒状部品と外筒状部品とを結合する。 In order to achieve the above object, in the present invention, of the two parts to be joined, the softer members are sheared at the corners provided on the harder member in a state where the parts that need to be positioned are positioned with a jig. While processing and shearing, the side surfaces of the corners and the sheared surfaces of the soft parts are fitted, and then the fitting surfaces of the two parts are joined by plastic bonding, press-fitting, or welding, and the fitting is performed. It is an outer cylindrical part with a bottom that has multiple steps on the inner surface and a hole with a straight portion in the center of the inner bottom, and the softer member penetrates in the center. An inner cylindrical part having a hole, and with the inner cylindrical part placed on a plurality of steps of the outer cylindrical part, positioning guide pins are inserted into the through holes of the inner cylindrical part. Insert until it is guided by the straight part of the hole of the inner cylindrical part and outer cylindrical part Residue generated on the side surface of at least one step of the plurality of steps by performing concentric temporary positioning and pressing the inner cylindrical component so that the plurality of steps of the outer cylindrical component are bitten. The inner cylindrical part and the outer cylindrical part are coupled by the self-tightening force that is stress.
また、せん断した嵌合部以外の側面には隙間を設け、精度に影響する外力が加わらないようにする。 Further, a gap is provided on the side surface other than the sheared fitting portion so that an external force affecting the accuracy is not applied.
本発明によれば、位置決めした部分を基準に2部品を全周均一な状態(ギャップ0)で嵌合でき、嵌合面で結合することによりスプリングバックや隙間等による精度悪化が無いため、位置決めした状態を維持したまま2部品を高精度に結合できる。また、部品精度に影響されず、結合することで2部品の組立て精度を出すことができる。 According to the present invention, the two parts can be fitted in a uniform state (gap 0) with the positioning portion as a reference, and there is no deterioration in accuracy due to springback, gaps, etc. by joining at the fitting surface. The two parts can be combined with high accuracy while maintaining the state. In addition, the assembly accuracy of the two components can be obtained by being coupled without being affected by the component accuracy.
本発明を使った燃料噴射弁では、ガイド部とシート面との同軸度が良く弁体が滑らかに作動するため、応答性が良く燃料を安定して精度良く噴射することができる。また、組立て精度に関係するシート部からの燃料洩れをなくすることができる。 In the fuel injection valve using the present invention, since the coaxiality between the guide portion and the seat surface is good and the valve body operates smoothly, the fuel can be stably and accurately injected with good responsiveness. Further, fuel leakage from the seat portion related to assembly accuracy can be eliminated.
本発明の実施例を図面に基づき説明する。 Embodiments of the present invention will be described with reference to the drawings.
図1は、本発明の一実施例である燃料噴射弁の全体構成を示す縦断面図である。 FIG. 1 is a longitudinal sectional view showing the overall configuration of a fuel injection valve according to an embodiment of the present invention.
燃料噴射弁本体1は、コア2,ヨーク3,ハウジング4,可動子5からなる磁気回路,磁気回路を励磁するコイル6、及びコイル6に通電する端子部7から構成されている。コア2とハウジング4の間にはシールリング8が結合され、コイル6に燃料が流入するのを防いでいる。 The fuel injection valve body 1 includes a magnetic circuit including a core 2, a yoke 3, a housing 4, and a mover 5, a coil 6 that excites the magnetic circuit, and a terminal portion 7 that energizes the coil 6. A seal ring 8 is coupled between the core 2 and the housing 4 to prevent fuel from flowing into the coil 6.
ハウジング4の内部にはバルブ部品が収納され、可動子5,ノズル9,可動子5のストローク量を調整するリング10が配置されている。可動子5は、弁体11と可動コア12をジョイント13で結合したものであり、可動コア12とジョイント13の間にはパイプ18と共同して可動子5が閉弁した時のバウンドを抑えるプレート14を備えている。 Valve parts are housed inside the housing 4, and a movable element 5, a nozzle 9, and a ring 10 that adjusts the stroke amount of the movable element 5 are arranged. The movable element 5 is obtained by connecting the valve body 11 and the movable core 12 with a joint 13, and suppresses the bounce when the movable element 5 is closed in cooperation with the pipe 18 between the movable core 12 and the joint 13. A plate 14 is provided.
外套部材を構成するハウジング4とノズル9は、可動子5の周囲を覆ってなり、ノズル9は、先端にシート面15a,オリフィス54を有しカップ形状をしたノズル15と、ガイドプレート16と共に可動子5を摺動可能に保持するガイド17を備えている。 The housing 4 and the nozzle 9 constituting the outer cover member cover the periphery of the movable element 5, and the nozzle 9 is movable together with the nozzle 15 having a sheet surface 15 a and an orifice 54 at the tip and a cup shape, and the guide plate 16. A guide 17 for holding the child 5 slidably is provided.
コア2の内部には弁体11をシート面15aにパイプ18とプレート14を介して押圧するスプリング19,スプリング19の押圧荷重を調整するアジャスタ20,外部からのコンタミの進入を防ぐフィルター21が配置されている。 A spring 19 that presses the valve element 11 against the seat surface 15a via the pipe 18 and the plate 14, an adjuster 20 that adjusts the pressing load of the spring 19, and a filter 21 that prevents entry of contamination from the outside are disposed inside the core 2. Has been.
次に、上記燃料噴射弁本体1の動作について詳細に説明する。 Next, the operation of the fuel injection valve body 1 will be described in detail.
コイル6に通電すると、可動子5がスプリング19の付勢力に抗してコア2の方向に吸引され、可動子5の先端の弁シート部11aとシート面15aとの間に隙間ができる(開弁状態)。加圧されている燃料はまずコア2,アジャスタ20,パイプ18から可動子5内の燃料通路13aを経てノズル9内に入る。次にガイドプレート16の燃料通路16a,ノズルの通路9aからガイド17の通路17aを通り、弁シート部11aとシート面15aの隙間からオリフィス54を経て噴射される。 When the coil 6 is energized, the mover 5 is attracted in the direction of the core 2 against the urging force of the spring 19, and a gap is formed between the valve seat portion 11a at the tip of the mover 5 and the seat surface 15a (opening). Valve state). The pressurized fuel first enters the nozzle 9 from the core 2, the adjuster 20, and the pipe 18 through the fuel passage 13 a in the mover 5. Next, the fuel is injected from the fuel passage 16a of the guide plate 16 and the passage 9a of the nozzle through the passage 17a of the guide 17 and through the orifice 54 through the gap between the valve seat portion 11a and the seat surface 15a.
一方、コイル6の電流を遮断した場合には、可動子5の弁シート部11aがスプリング19の力でシート面15aに当接し、閉弁状態となる。 On the other hand, when the current of the coil 6 is interrupted, the valve seat portion 11a of the mover 5 is brought into contact with the seat surface 15a by the force of the spring 19, and the valve is closed.
次にノズル15とガイド17の結合方法について図2〜図7に基づいて説明する。図2はノズルとガイドのセット状態と組立て治具を示す縦断面図、図3はノズルとガイドの位置決め状態を示す縦断面図、図4はノズルとガイドのせん断加工状態を示す縦断面図、図5はノズルとガイドの結合状態を示す縦断面図、図6はノズルとガイドの結合工程を示すフローチャート、図7は組立終了後の燃料噴射弁のノズルとガイド部を示す拡大図である。 Next, a method for connecting the nozzle 15 and the guide 17 will be described with reference to FIGS. 2 is a longitudinal sectional view showing a set state of the nozzle and guide and an assembling jig, FIG. 3 is a longitudinal sectional view showing a positioning state of the nozzle and guide, and FIG. 4 is a longitudinal sectional view showing a shearing state of the nozzle and guide. FIG. 5 is a longitudinal sectional view showing a combined state of the nozzle and the guide, FIG. 6 is a flowchart showing the connecting step of the nozzle and the guide, and FIG. 7 is an enlarged view showing the nozzle and the guide portion of the fuel injection valve after assembly.
ノズル15とガイド17の結合の目的は、弁体11がガイド17のガイド中心孔17bで摺動可能に保持され、更に弁シート部11aがシート面15aと密着し燃料をシールするために、ガイド中心孔17bとシート面15aは例えば同芯度10μm以下に結合する必要がある。また、ノズル15の硬さはHRC52以上であり、ガイド17の硬さはHv130〜350である。 The purpose of the connection between the nozzle 15 and the guide 17 is that the valve body 11 is slidably held in the guide center hole 17b of the guide 17, and the valve seat portion 11a is in close contact with the seat surface 15a to seal the fuel. The center hole 17b and the sheet surface 15a need to be coupled to a concentricity of 10 μm or less, for example. Moreover, the hardness of the nozzle 15 is HRC52 or more, and the hardness of the guide 17 is Hv130-350.
まず、図2に示すようにノズル15の内部にガイド17をセットする。これは図6の「ワーク挿入」の工程に相当する。 First, as shown in FIG. 2, the guide 17 is set inside the nozzle 15. This corresponds to the “work insertion” step of FIG.
この状態で、図3に示すようにマンドレル31のガイド部31aをガイド中心孔17bに挿入し、球面部31bをシート面15aに当接させ、シート面15a基準でガイド中心孔17bの芯出しをする。これは図6の「芯出し位置決め」の工程に相当する。この時、例えばガイド17の外径とガイド中心孔17b、またはノズル内径15bとシート面15aに芯ずれがある場合は、クリアランスaとクリアランスbに差が発生する。 In this state, as shown in FIG. 3, the guide portion 31a of the mandrel 31 is inserted into the guide center hole 17b, the spherical portion 31b is brought into contact with the seat surface 15a, and the guide center hole 17b is centered with respect to the seat surface 15a. To do. This corresponds to the “centering positioning” step of FIG. At this time, for example, when there is a misalignment between the outer diameter of the guide 17 and the guide center hole 17b or the nozzle inner diameter 15b and the sheet surface 15a, a difference occurs between the clearance a and the clearance b.
次に、パンチ32を下降させ、パンチ32がガイド17に当接する。更にパンチ32を下降させると、図4に示すようにガイド17の端部が段部A15cに食込み、ガイド17の角部がせん断加工される。この時、せん断部17cは段部A15cの側面にギャップが無く嵌合されていく。これは図6の「加圧」,「せん断加工」及び「2部品嵌合」の工程に相当する。一方、せん断された余肉17dは逃げ部15d内に押出されるがノズル15の内径とは当接しない。 Next, the punch 32 is lowered and the punch 32 comes into contact with the guide 17. When the punch 32 is further lowered, the end portion of the guide 17 bites into the stepped portion A15c as shown in FIG. 4, and the corner portion of the guide 17 is sheared. At this time, the shearing portion 17c is fitted to the side surface of the stepped portion A15c without a gap. This corresponds to the steps of “pressing”, “shearing”, and “two-part fitting” in FIG. On the other hand, the sheared excess 17d is pushed into the escape portion 15d but does not come into contact with the inner diameter of the nozzle 15.
続けてパンチ32を下降させていくと、図5に示すようにガイド17の角部は段部B15eに食込み、せん断部17cは加圧方向に対して約90°方向、つまり段部A15cの側面側に塑性流動して圧着され、自緊力(残留応力)で結合する。これは図6の「嵌合面で結合」の工程に相当する。 When the punch 32 is continuously lowered, as shown in FIG. 5, the corner portion of the guide 17 bites into the step portion B15e, and the shearing portion 17c is in the direction of about 90 ° with respect to the pressing direction, that is, the side surface of the step portion A15c. It is plastically flowed to the side and pressed and bonded by self-tightening force (residual stress). This corresponds to the process of “joining at the fitting surface” in FIG.
図7に示すように、組立終了後は、図5でマンドレル31が挿入されていた部分に弁体11が挿入され、弁体11はガイド17によってガイドされる。 As shown in FIG. 7, after the assembly is finished, the valve body 11 is inserted into the portion where the mandrel 31 is inserted in FIG. 5, and the valve body 11 is guided by the guide 17.
以上説明したように、シート面15aとガイド中心孔17bを芯出ししたままの状態で、せん断部17cと段部A15cの側面をギャップなく嵌合したまま、嵌合面だけで2部品を結合するので、結合後の残留応力は全周均一になりマンドレル31を取り除いた後でもガイド17がずれることなく、高精度な結合ができる。 As described above, in a state where the sheet surface 15a and the guide center hole 17b are centered, the two parts are joined only by the fitting surface while the side surfaces of the shearing portion 17c and the stepped portion A15c are fitted without a gap. Therefore, the residual stress after the coupling becomes uniform over the entire circumference, and even after the mandrel 31 is removed, the guide 17 is not displaced and the coupling can be performed with high accuracy.
図14にガイド17の外径とガイド中心孔17bの同軸度が5〜25μmの部品を結合した実験結果を示す。結合後のシート面15aとガイド中心孔17bの同芯度は、特許文献2のような従来法では通常、平均14.1μmであったものが、本実施例では平均3μmに向上でき、精度,ばらつきとも大幅に向上できた。 FIG. 14 shows the result of an experiment in which components having an outer diameter of the guide 17 and the guide center hole 17b of 5 to 25 μm are connected. The concentricity of the sheet surface 15a after bonding and the guide center hole 17b is usually 14.1 μm on average in the conventional method as in Patent Document 2, but can be improved to 3 μm on average in this embodiment. The variation was greatly improved.
更に付け加えるならば、マンドレル31のガイド部31aをガイド中心孔17bに対してギャップなく挿入することが望ましく、圧入することが望ましい。また、結合部以外はガイド17の外径とノズル内径15bが当接しないことが望ましく、ガイド17の外径とノズル内径15bはクリアランスを設ける寸法関係とする。 In addition, it is desirable to insert the guide portion 31a of the mandrel 31 into the guide center hole 17b without a gap, and it is desirable to press-fit. Further, it is desirable that the outer diameter of the guide 17 and the nozzle inner diameter 15b do not contact each other except for the coupling portion, and the outer diameter of the guide 17 and the nozzle inner diameter 15b have a dimensional relationship for providing a clearance.
図5に対してノズルとガイドとの結合強度を向上させるために、図8及び図9に示すように、段部A15cの側面に塑性流動部を設けてもよい。 In order to improve the bonding strength between the nozzle and the guide with respect to FIG. 5, a plastic flow portion may be provided on the side surface of the step portion A15c as shown in FIGS.
図8では段部A15cの側面にアンダーカット部15fを設け、ガイド17の角部が段部B15eに食込んだときに発生する塑性流動で、アンダーカット部15f内に材料を流し込み、結合強度をより向上させたものである。 In FIG. 8, the undercut portion 15f is provided on the side surface of the step portion A15c, and a plastic flow is generated when the corner portion of the guide 17 bites into the step portion B15e. It is a further improvement.
結合の方法は図2〜図5で説明したものと同一であり、結合後の同芯度も同等である。 The method of coupling is the same as that described in FIGS. 2 to 5, and the concentricity after coupling is also the same.
また、図9ではアンダーカット部15fの代わりに結合溝15gを設けたものである。 In FIG. 9, a coupling groove 15g is provided instead of the undercut portion 15f.
尚、結合溝15gは複数本設けても良い。 A plurality of coupling grooves 15g may be provided.
アンダーカット部15fや結合溝15gを設けることにより、図5に示した自緊力による結合より結合強度を2〜5倍向上することができるため、必要強度に応じて設定する。 By providing the undercut portion 15f and the coupling groove 15g, the coupling strength can be improved 2 to 5 times as compared with the coupling by the self-tightening force shown in FIG.
本発明の第2実施例となる軸受け構造を図10に示す。 A bearing structure according to a second embodiment of the present invention is shown in FIG.
ホルダ51内に軸受けA52,軸受けB53が同軸上に固定され、軸54が2点支持されている。 A bearing A52 and a bearing B53 are coaxially fixed in the holder 51, and two shafts 54 are supported.
本軸受け構造の組立て方法は、図11に示すように軸受けA52が圧入等で固定されたホルダ51内の内径部51aに軸受けB53を組み込み、マンドレル54で軸受けB53の内径を位置出ししながら芯出し部54aで軸受けA52の内径基準で仮組みする。 As shown in FIG. 11, the bearing structure is assembled by inserting a bearing B53 into an inner diameter portion 51a in a holder 51 to which a bearing A52 is fixed by press fitting or the like, and centering the bearing B53 while positioning the inner diameter of the bearing B53 with a mandrel 54. The part 54a is temporarily assembled on the basis of the inner diameter of the bearing A52.
次に、図2〜図5と同様にパンチ55で軸受けB53を押圧し、軸受けB53の角部を段部A51bでせん断加工しながらその側面に嵌合し、続いて段部B51cに食込ませ、そのときの塑性流動で軸受けB53を嵌合面となる段部A51bの側面に結合する。 Next, the bearing B53 is pressed with the punch 55 in the same manner as in FIGS. 2 to 5, and the corner portion of the bearing B53 is fitted to the side surface while being sheared with the step portion A51b, and then is bitten into the step portion B51c. Then, the bearing B53 is coupled to the side surface of the stepped portion A51b serving as the fitting surface by the plastic flow at that time.
図12は塑性結合の代わりに溶接した例であり、図11と同様に、軸受けB53の角部を段部A51bでせん断加工しながらホルダ51に必要長さ分嵌合させ、嵌合面で溶接部51dのようにレーザー溶接等により結合したものである。 FIG. 12 shows an example of welding instead of plastic bonding. Similarly to FIG. 11, the corner portion of the bearing B53 is fitted to the holder 51 by a required length while being sheared at the stepped portion A51b and welded at the fitting surface. Like the part 51d, it is joined by laser welding or the like.
溶接による結合では芯ずれを防止するために圧入することが必要条件になるが、圧入するとマンドレル54で芯出しができないため、結合に関係する部分の同軸度を全て0に近づけなければならなかった。 In order to prevent misalignment in the joining by welding, it is necessary to press-fit, but if it is press-fit, the mandrel 54 cannot be centered, so the coaxiality of the parts related to the joining must all be close to zero. .
図13は圧入して結合した例である。段部A51bの(図の方向で)下側の内径51eを、圧入強度を得るために必要なだけ段付き(小径)にし、かつ同軸状に加工したホルダ51を用い、軸受けB53の角部を段部A51bでせん断加工しながら嵌合し、そのまま軸受けB53を内径51e内に押し込むことで同時に圧入するものである。圧入の場合、圧入代を厳密に管理するため2部品の内径と外径を精密に加工しなければならないが、本実施例の場合は、ホルダ51の内径の段差を管理するだけで済むので、結合強度のばらつきを低減でき部品加工,寸法管理とも容易に、安価にできる。 FIG. 13 shows an example of press-fitting and coupling. The lower inner diameter 51e (in the direction of the figure) of the step A51b is stepped (small diameter) as much as necessary to obtain the press-fitting strength, and the corner 51 of the bearing B53 is The step A51b is fitted while being subjected to a shearing process, and the bearing B53 is directly pressed into the inner diameter 51e to be press-fitted at the same time. In the case of press-fitting, the inner and outer diameters of the two parts must be precisely machined in order to strictly control the press-fitting allowance, but in this embodiment, it is only necessary to manage the step of the inner diameter of the holder 51. Variations in bond strength can be reduced, and parts processing and dimensional management can be easily and inexpensively performed.
以上、図11〜図13で軸受け構造の組立て方法について説明したが、何れの結合方法でもマンドレルで軸受けAを基準にして軸受けBを芯出ししたままの状態にして段部Aで軸受けBの外径をせん断加工し、ギャップなく2部品を嵌合できるので、結合方法に拘らず結合後に芯ずれすることが無く、また部品精度の影響を受けることなく軸受けAと軸受けBを同軸度良く高精度に結合できる。 The assembly method of the bearing structure has been described above with reference to FIGS. 11 to 13. However, in any coupling method, the bearing B is centered on the bearing A with the mandrel and the step B is outside the bearing B. Since the diameter can be sheared and two parts can be fitted without gaps, there is no misalignment after joining regardless of the joining method, and the bearing A and bearing B are highly accurate with good coaxiality without being affected by the precision of the parts. Can be combined.
以上のように本発明の実施例を具体的に説明したが、本発明はこれに限られることなく、発明思想の範囲内で種々の変更が可能である。例えば本発明では同軸度について説明したが、位置精度についても同じ効果があり、高精度に位置決め・組立てできる。また、せん断加工したときに発生する余肉部は、更に軸受けBを深く押し込むことで、取り除くこともできる。 As described above, the embodiment of the present invention has been specifically described. However, the present invention is not limited to this, and various modifications can be made within the scope of the inventive idea. For example, although the coaxiality has been described in the present invention, the same effect can be obtained with respect to positional accuracy, and positioning and assembly can be performed with high accuracy. Moreover, the surplus part which generate | occur | produces when carrying out a shearing process can also be removed by pushing in the bearing B deeply.
更に、第2の実施例では硬い部品であるホルダに段部を設けたが、軸受けにベアリングを用いる場合は、ホルダを軟らかくして硬いベアリングの外径に段差を設けても良い。 Furthermore, in the second embodiment, the step portion is provided in the holder which is a hard part. However, when a bearing is used for the bearing, the holder may be softened to provide a step in the outer diameter of the hard bearing.
本発明に係る実施例によれば、2部品を位置精度良く結合する場合に、部品の単品精度の影響がなく、位置出ししたままの精度で結合後の精度を保つことができる。また、溶接や圧入で位置精度良く組立てる場合には、単品精度を向上させるしか手段がなかったが、本発明に係る実施例により、組立て時に精度を上げることができる。よって、単品精度が良くない安価な部品でも高精度な組立てが可能になる。 According to the embodiment of the present invention, when two parts are joined with high positional accuracy, there is no influence of the single part precision of the parts, and the accuracy after joining can be maintained with the accuracy of positioning. Further, in the case of assembling with high positional accuracy by welding or press-fitting, there has been only means for improving the accuracy of a single product, but the embodiment according to the present invention can improve the accuracy during assembly. Therefore, it is possible to assemble with high accuracy even with an inexpensive part having low accuracy.
15 ノズル
15a シート面
15b ノズル内径
15c 段部A
15d 逃げ部
15e 段部B
15f アンダーカット部
15g 結合溝
17 ガイド
17b ガイド中心孔
17c せん断部
17d 余肉
31 マンドレル
31a ガイド部
31b 球面部
32 パンチ
15 Nozzle 15a Sheet surface 15b Nozzle inner diameter 15c Step A
15d Escape part 15e Step B
15f Undercut portion 15g Coupling groove 17 Guide 17b Guide center hole 17c Shear portion 17d Extra thickness 31 Mandrel 31a Guide portion 31b Spherical surface portion 32 Punch
Claims (2)
位置決めの必要なお互いの部分を治具で位置決めした状態で、
前記2部品のうち硬い方の部材に設けた角部で軟らかい方の部材をせん断加工し、かつ、前記角部の側面と前記せん断した面とで前記2部品を嵌合させた嵌合面を有し、
前記嵌合面で結合し、
硬い方の部材が内面に複数段の段部と内底の中心部にストレート部のある穴とを有する底付きの外筒状部品であり、軟らかい方の部材が中心に貫通孔を有する内筒状部品であり、
前記内筒状部品を前記外筒状部品の複数段の段部に載置した状態で、前記内筒状部品の貫通孔に位置決め用のガイドピンを前記外筒状部品の前記穴のストレート部でガイドされるまで挿入して、前記内筒状部品と前記外筒状部品の同芯的な仮位置決めを行い、前記内筒状部品を押圧することにより前記外筒状部品の複数段の段部に食い込ませ、前記複数段の段部のうち少なくとも一つの段部の側面に発生する残留応力である自緊力により、前記内筒状部品と前記外筒状部品とを結合することを特徴とする2部品の結合方法。 In the joining method of two parts,
With each part that needs positioning positioned with a jig,
A fitting surface obtained by shearing a soft member at a corner provided on a hard member of the two parts and fitting the two parts between a side surface of the corner and the sheared surface. Have
Combined at the mating surface,
The hard member is an outer cylindrical part with a bottom having a plurality of stepped portions on the inner surface and a hole having a straight portion at the center of the inner bottom, and the inner member having a through hole at the center of the softer member Shaped parts,
In a state where the inner cylindrical part is placed on a plurality of steps of the outer cylindrical part, positioning guide pins are inserted into the through holes of the inner cylindrical part and the straight part of the hole of the outer cylindrical part. Until the inner cylindrical part and the outer cylindrical part are concentrically positioned, and by pressing the inner cylindrical part, a plurality of steps of the outer cylindrical part are inserted. The inner cylindrical part and the outer cylindrical part are coupled by self-tightening force that is a residual stress generated on a side surface of at least one of the plurality of stepped parts. The joining method of two parts.
前記外筒状部品の複数段の段部のうち少なくとも一つの段部の側面にアンダーカット部を設け、前記アンダーカット部に発生する残留応力である自緊力とアンダーカット部に塑性流動させた前記軟らかい部材とにより、前記内筒状部品と前記外筒状部品とを結合することを特徴とする2部品の結合方法。 The method of connecting two parts according to claim 1,
An undercut portion is provided on a side surface of at least one step portion of the plurality of step portions of the outer cylindrical part, and the self-tightening force that is a residual stress generated in the undercut portion and the undercut portion are plastically flowed. A method of joining two parts, wherein the inner cylindrical part and the outer cylindrical part are joined by the soft member.
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JPS61245934A (en) * | 1985-04-24 | 1986-11-01 | Mazda Motor Corp | Joining method for metal member |
JPH0710471B2 (en) * | 1989-09-25 | 1995-02-08 | 株式会社日立製作所 | Concentric coupling method for precision parts composed of multiple members, and method for assembling fuel injection nozzle using the same |
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