JP6029810B2 - Screw fastening structure - Google Patents

Screw fastening structure Download PDF

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JP6029810B2
JP6029810B2 JP2011078674A JP2011078674A JP6029810B2 JP 6029810 B2 JP6029810 B2 JP 6029810B2 JP 2011078674 A JP2011078674 A JP 2011078674A JP 2011078674 A JP2011078674 A JP 2011078674A JP 6029810 B2 JP6029810 B2 JP 6029810B2
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screw
hole
fastening
pilot hole
burring
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JP2012211678A (en
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達行 大西
達行 大西
伸也 大坪
伸也 大坪
洋一 小島
洋一 小島
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リンナイ株式会社
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本発明は、締結物と被締結物とをねじで締結させるねじ締結構造に関する。   The present invention relates to a screw fastening structure for fastening a fastening object and a fastened object with screws.
例えば、ガス器具等に使用される箱体等を構成する板金同士のねじ締結構造として、締結物となる板金にバーリング下穴を形成し、被締結物となる板金に設けた抜き穴にタッピンねじを通してバーリング下穴に螺合させる構造がある。この場合、タッピンねじを締め付ける際に、タッピンねじの引き上げ力によって締結物のバーリング下穴の周縁部が盛り上がるように変形してねじ締付能力が低下することがあった。このような不具合を解消するため、各種のねじ締結構造が提案されている。   For example, as a screw fastening structure between metal plates constituting a box used for gas appliances, etc., a burring pilot hole is formed in a metal plate to be fastened, and a tapping screw is provided in a punch hole provided in the metal plate to be fastened There is a structure that is screwed into the burring pilot hole. In this case, when the tapping screw is tightened, the pulling force of the tapping screw may deform so that the peripheral portion of the burring pilot hole of the fastening object rises, and the screw tightening ability may decrease. In order to eliminate such problems, various screw fastening structures have been proposed.
例えば、バーリング下穴を改良したものとして、バーリング下穴の基端部をテーパ状の皿座とし、バーリング下穴の周縁部の剛性を大きくしたもの(特許文献1)、また、バーリング下穴の根元部分にその外周面から突出する複数のリブを形成し、バーリング下穴の周縁部の変形を阻止するようにしたもの(特許文献2)等がある。   For example, as an improvement of the burring pilot hole, the base end of the burring pilot hole is a tapered countersunk, and the rigidity of the peripheral part of the burring pilot hole is increased (Patent Document 1). There is a structure in which a plurality of ribs protruding from the outer peripheral surface are formed at the base portion to prevent deformation of the peripheral portion of the burring pilot hole (Patent Document 2).
また、ねじの形状を変更したものとして、段付ねじを用い、段付ねじの段部にバーリング下穴の周縁部を当接させるようにし、バーリング下穴の周縁部の変形を阻止するようにしたものがある(特許文献3)。   Also, as a modified version of the screw, use a stepped screw so that the peripheral part of the burring pilot hole abuts on the step part of the stepped screw to prevent deformation of the peripheral part of the burring pilot hole (Patent Document 3).
特公昭54−27503号公報Japanese Patent Publication No.54-27503 特開2009−293663号公報JP 2009-293663 A 特開昭62−24011号公報JP-A-62-24011
しかしながら、バーリング下穴を改良したものでも、特許文献1のものではバーリング下穴のテーパ状の皿座の周縁部や、特許文献2のものではバーリング下穴の外周面に突設するリブの周縁部においては、ねじの引き上げ力による変形を防止することが困難であった。特に、バーリング下穴を形成する締結物として、この締結物を構成する板金の板厚が薄くなると、バーリング下穴の周縁部の変形が大きくなり、しかもバーリング下穴の雌ねじの破壊トルクが減少するため、ねじ締結に要求される締付能力を十分に発揮できなかった。   However, even if the burring pilot hole is improved, the peripheral edge of the tapered countersink of the burring pilot hole in Patent Document 1 and the peripheral edge of the rib protruding from the outer peripheral surface of the burring pilot hole in Patent Document 2 It was difficult to prevent deformation at the portion due to the lifting force of the screw. In particular, as the fastener for forming the burring pilot hole, when the thickness of the sheet metal constituting the fastener is reduced, the peripheral edge of the burring pilot hole is greatly deformed, and the breaking torque of the female screw of the burring pilot hole is reduced. For this reason, the tightening ability required for screw fastening could not be sufficiently exhibited.
一方、特許文献3の段付ねじを採用するものでは、段付ねじを被締結物の抜き穴に通す際、段付ねじの段部が抜き穴の周縁に引っ掛かって抜き穴への挿入が阻害されることがあり、また、段付ねじは、先端のねじ部が見え難く、バーリング下穴への挿入に手間どることがあり、そのため、ねじ締結の作業性を低下させることがあった。また、段付ねじを採用することで被締結物の抜き穴の穴径が大きくなるため、この被締結物を薄板の板金で構成すると、抜き穴の周縁部の強度が低下するおそれがあった。しかも、段付ねじのような特殊なねじを使用するのはコスト的にも不経済であった。   On the other hand, in the case of using the stepped screw disclosed in Patent Document 3, when the stepped screw is passed through the hole to be fastened, the stepped portion of the stepped screw is caught on the periphery of the hole and obstructing insertion into the hole. In addition, the stepped screw is difficult to see the threaded portion at the tip, and may be troublesome for insertion into the burring pilot hole, which may reduce the workability of screw fastening. In addition, since the hole diameter of the hole to be fastened is increased by adopting the stepped screw, if the object to be fastened is formed of a thin sheet metal, the strength of the peripheral portion of the hole may be reduced. . Moreover, it is uneconomical to use special screws such as stepped screws.
本発明は、以上の事情に鑑みてなされたものであり、ねじの締結作業性を低下させることがなく、且つねじ締付能力の向上を図ることが可能なねじ締結構造を提供することを課題とする。   The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a screw fastening structure capable of improving the screw fastening capability without reducing the screw fastening workability. And
本発明に係るねじ締結構造は、
締結物にバーリング下穴を形成し、被締結物に設けた抜き穴にねじを通してバーリング下穴に螺合させるねじ締結構造であって、
被締結物の抜き穴の周縁部を立ち起こして突口を形成し、この突口を基端部から先端部まで連続して先端部に向かって小径となるテーパ状に形成し、ねじをバーリング下穴に螺合させるとテーパ状の突口の先端部がバーリング下穴の基端部の周縁にある周縁部であり且つ平坦面に当接する構成としたものである。
The screw fastening structure according to the present invention includes:
A screw fastening structure in which a burring pilot hole is formed in a fastening object, and a screw is inserted into a burring pilot hole through a screw hole provided in the article to be fastened,
The peripheral edge of the hole to be fastened is raised to form a protrusion, and the protrusion is formed in a tapered shape with a small diameter toward the distal end continuously from the base end to the burring screw. When screwed into the pilot hole, the tip end of the tapered protrusion is a peripheral part at the peripheral edge of the base end part of the burring pilot hole and abuts against a flat surface .
これにより、抜き穴の突口の先端部がバーリング下穴の周縁部に当接することによって、ねじの引き上げ力で締結物のバーリング下穴の周縁部が盛り上がって変形することを確実に阻止することができる。また、突口の先端部によってバーリング下穴がねじの螺入で拡径しようとする力を抑え込むことができる。従って、バーリング下穴の雌ねじが破壊する限界のトルクである破壊トルクを増大することができ、ねじ締付能力を向上することができる。   This ensures that the peripheral edge of the burring pilot hole of the fastening object is prevented from rising and deforming due to the lifting force of the screw by the tip of the protrusion of the punch hole coming into contact with the peripheral edge of the burring pilot hole. Can do. Further, the force of the burring pilot hole to increase the diameter by screwing can be suppressed by the tip of the protrusion. Therefore, it is possible to increase the breaking torque, which is the limit torque that the female screw of the burring pilot hole breaks, and to improve the screw tightening ability.
また、ねじは、一般的なねじを使用することで十分にバーリング下穴の雌ねじの破壊トルクを向上することができ、段付ねじのような特殊ねじを使用する必要がない。従って、ねじを抜き穴やバーリング下穴に円滑に挿入することができ、ねじの締結作業性を低下させることがない。また、段付ねじを用いた場合のように被締結物の抜き穴の穴径を大きくしなくてもよく、被締結物を薄板にした場合でも抜き穴の周縁部の強度を確保することができ、しかも、一般的なねじを使用することでねじのコストを抑えることができる。   In addition, the use of a general screw can sufficiently improve the breaking torque of the female screw of the burring pilot hole, and there is no need to use a special screw such as a stepped screw. Therefore, the screw can be smoothly inserted into the punched hole or the burring pilot hole, and the fastening workability of the screw is not deteriorated. Moreover, it is not necessary to increase the hole diameter of the hole to be fastened as in the case of using a stepped screw, and even when the object to be fastened is a thin plate, the strength of the peripheral edge of the hole can be ensured. Moreover, the cost of the screw can be reduced by using a general screw.
上記ねじ締結構造において、突口は、先端部に向かって小径となるテーパ状に形成するので、テーパ状の突口が弾性機能を発揮して突口の先端部によってバーリング下穴を縮径方向に抑え込むことができる。従って、バーリング下穴の雌ねじの破壊トルクをより増大することができ、ねじ締付能力をより向上することができる。また、テーパ状の突口の弾性力の反力によってねじが強固に固定されるので、ねじの緩み止め効果が向上される。
上記ねじ締結構造において、締結物と被締結物との間に突口の高さよりも厚い厚みを有するシール用のパッキンをねじ締結後に圧縮状態に介在させる構成とするのが望ましい。
In the above screw fastening structure, the protrusion is formed in a taper shape having a small diameter toward the tip, so that the tapered protrusion exhibits an elastic function and the burring pilot hole is reduced in the diameter direction by the tip of the protrusion. Can be suppressed. Therefore, the breaking torque of the internal thread of the burring pilot hole can be further increased, and the screw tightening ability can be further improved. Further, since the screw is firmly fixed by the reaction force of the elastic force of the tapered protrusion, the effect of preventing the screw from loosening is improved.
In the above-described screw fastening structure, it is desirable that a sealing packing having a thickness larger than the height of the protrusion is interposed between the fastening object and the fastening object after the screw fastening to be interposed in a compressed state.
上記ねじ締結構造において、締結物のバーリング下穴の基端部をテーパ状に形成し、被締結物の抜き穴の突口の先端部がバーリング下穴のテーパ状基端部の周縁にある周縁部であり且つ平坦面に当接する構成とするのが望ましい。
この場合、締結物のバーリング下穴の基端部をテーパ状に形成することによりバーリング下穴の周縁部の剛性を強くすることができ、しかも、抜き穴の突口の先端部によってねじの引き上げ力によるバーリング下穴のテーパ部分の周縁部の変形を確実に阻止することができる。
In the above screw fastening structure, the base end portion of the burring pilot hole of the fastening object is formed in a tapered shape, and the tip end portion of the protruding hole of the fastening hole of the fastening object is the peripheral edge of the tapered base end portion of the burring pilot hole It is desirable to have a configuration that is a part and abuts on a flat surface .
In this case, it is possible to increase the rigidity of the peripheral edge of the burring pilot hole by forming the base end of the burring pilot hole of the fastening object into a taper shape, and to pull up the screw by the tip of the protrusion of the punch hole. Deformation of the peripheral edge of the tapered portion of the burring pilot hole due to force can be reliably prevented.
上記ねじ締結構造において、ねじの頭部の下面は、平坦面に形成されており、被締結物の突口を形成しない表側の抜き穴の周縁部における平坦な座面を押圧する構成とするのが望ましい。
これにより、ねじをバーリング下穴に螺合することで抜き穴の周縁部の突口をバーリング下穴の周縁部に強く押し付けることができる。従って、ねじの引き上げ力による締結物のバーリング下穴の周縁部の盛り上がりをより確実に阻止することができる。
In the above screw fastening structure, the lower surface of the head of the screw is formed as a flat surface, and is configured to press the flat seating surface at the peripheral edge portion of the front side hole that does not form the protrusion of the object to be fastened. Is desirable.
Thereby, the protrusion of the peripheral part of a punching hole can be strongly pressed on the peripheral part of a burring pilot hole by screwing a screw in a burring pilot hole. Therefore, it is possible to more reliably prevent the peripheral edge portion of the burring prepared hole of the fastening product from being pulled up by the screw.
以上のように、本発明に係るねじ締結構造によれば、締結物のバーリング下穴の周縁部の変形を確実に阻止してバーリング下穴の破壊トルクを増大することができるので、締結物の板厚を薄くしても、ねじ締結に要求される締付能力を十分に発揮することができる。従って、締結物及び被締結物を薄板化して、重量の軽量化を図ることができ、また、製品コストを安くすることができる。また、段付ねじのような特殊ねじを使用する必要がないので、ねじの締結作業性を低下させることがない。   As described above, according to the screw fastening structure according to the present invention, it is possible to reliably prevent deformation of the peripheral portion of the burring pilot hole of the fastener and increase the breaking torque of the burring pilot hole. Even if the plate thickness is reduced, the tightening ability required for screw fastening can be sufficiently exhibited. Accordingly, the fastening object and the object to be fastened can be thinned to reduce the weight, and the product cost can be reduced. Further, since it is not necessary to use a special screw such as a stepped screw, the workability of screw fastening is not deteriorated.
参考例によるねじ締結構造を示す断面図である。It is sectional drawing which shows the screw fastening structure by a reference example . 参考例によるねじ締結構造においてタッピンねじを固く締め付ける前の状態を示す断面図である。It is sectional drawing which shows the state before tightening a tapping screw in the screw fastening structure by a reference example . 実施形態として、突口の形状をテーパ状に変更した場合のねじ締結構造を示す断面図である。It is sectional drawing which shows the screw fastening structure at the time of changing the shape of a protrusion into a taper shape as embodiment . 他の参考例として、バーリング下穴の形状をテーパ状に変更した場合のねじ締結構造を示す断面図である。It is sectional drawing which shows the screw fastening structure at the time of changing the shape of a burring pilot hole into a taper shape as another reference example .
以下に、本発明の実施形態について図面を参照しながら説明する。
本実施形態のねじ締結構造は、例えば、給湯器において熱交換器を収容する箱体とバーナを収容する箱体との連結部分等に利用される。ただし、本発明のねじ締結構造は、給湯器等のガス器具に限らず、各種製品における締結物と被締結物とをねじで締結させるねじ締結構造に適用することができる。
Embodiments of the present invention will be described below with reference to the drawings.
The screw fastening structure of the present embodiment is used for, for example, a connecting portion between a box body that houses a heat exchanger and a box body that houses a burner in a water heater. However, the screw fastening structure of the present invention is not limited to a gas appliance such as a water heater, and can be applied to a screw fastening structure in which a fastening object and a fastening object in various products are fastened with screws.
図1に示すように、参考例としてのねじ締結構造は、締結物となる第1の板材1に被締結物となる第2の板材2をシール用のパッキン4を介在させて重ね合わせ、これら第1の板材1と第2の板材2とをタッピンねじ3で締結させた構造である。第1の板材1及び第2の板材2は、板金で形成され、パッキン4は、発泡樹脂材等で形成されている。タッピンねじ3は、頭部31とねじ軸33とからなる一般的なタッピンねじが使用され、頭部31の下面32は、平坦面に形成されている。 As shown in FIG. 1, a screw fastening structure as a reference example is formed by superposing a second plate material 2 to be fastened on a first plate material 1 to be fastened with a seal packing 4 interposed therebetween. In this structure, the first plate 1 and the second plate 2 are fastened with a tapping screw 3. The 1st board | plate material 1 and the 2nd board | plate material 2 are formed with a sheet metal, and the packing 4 is formed with the foaming resin material etc. As the tapping screw 3, a general tapping screw including a head portion 31 and a screw shaft 33 is used, and a lower surface 32 of the head portion 31 is formed in a flat surface.
第1の板材1には、ねじ締付位置にバーリング加工により略90度に立ち上がった円筒部12を有するバーリング下穴11が形成されている。バーリング下穴11の円筒部12の内径は、タッピンねじ3のねじ軸33の山径よりも径小に形成されており、このバーリング下穴11にタッピンねじ3が螺合される。   The first plate 1 is formed with a burring pilot hole 11 having a cylindrical portion 12 that rises at approximately 90 degrees by burring at a screw tightening position. The inner diameter of the cylindrical portion 12 of the burring pilot hole 11 is smaller than the crest diameter of the screw shaft 33 of the tapping screw 3, and the tapping screw 3 is screwed into the burring pilot hole 11.
第2の板材2には、第1の板材1のバーリング下穴11と対応する位置にバーリング下穴11よりも径大な抜き穴21が形成されている。抜き穴21の内径は、タッピンねじ3のねじ軸33の山径よりも径大で、且つタッピンねじ3の頭部31の外径よりも径小に形成されている。この抜き穴21にタッピンねじ3が挿通される。   In the second plate member 2, a punched hole 21 having a diameter larger than that of the burring pilot hole 11 is formed at a position corresponding to the burring pilot hole 11 of the first plate member 1. The inner diameter of the punch hole 21 is larger than the crest diameter of the screw shaft 33 of the tapping screw 3 and smaller than the outer diameter of the head 31 of the tapping screw 3. The tapping screw 3 is inserted into the punched hole 21.
また、第2の板材2の抜き穴21の周縁部は、第2の板材2の裏側においてバーリング加工により略90度に立ち起こした円筒状の突口22となっている。この突口22は、タッピンねじ3を抜き穴21を通してバーリング下穴11に螺合させると、この突口22の先端部23がバーリング下穴11の周縁部13に当接される。第2の板材2の表側における抜き穴21の周縁部は、平坦な座面24となっており、この平坦な座面24にタッピンねじ3の頭部31の平坦な下面32が当接される。なお、抜き穴21においてタッピンねじ3の頭部31と第2の板材2の座面24との間に座金を介在させてもよい。また、パッキン4には、第2の板材2における抜き穴21の突口22が嵌り込む大きさの孔部41が形成されている。   Further, the peripheral edge portion of the punched hole 21 of the second plate member 2 is a cylindrical protrusion 22 that is raised at about 90 degrees by burring on the back side of the second plate member 2. When the tapping screw 3 is screwed into the burring pilot hole 11 through the hole 21, the tip 23 of the protrusion 22 comes into contact with the peripheral edge 13 of the burring pilot hole 11. A peripheral edge portion of the punched hole 21 on the front side of the second plate member 2 is a flat seat surface 24, and the flat lower surface 32 of the head portion 31 of the tapping screw 3 is brought into contact with the flat seat surface 24. . Note that a washer may be interposed between the head 31 of the tapping screw 3 and the seating surface 24 of the second plate member 2 in the punched hole 21. The packing 4 is formed with a hole 41 having a size into which the protrusion 22 of the punched hole 21 in the second plate member 2 is fitted.
次に、第1の板材1と第2の板材2とをタッピンねじ3でねじ締結する動作を説明する。
第1の板材1のバーリング下穴11とパッキン4の孔部41と第2の板材2の抜き穴21とが一致するように、第1の板材1と第2の板材2とをパッキン4を介在させて重ね合わせる。このとき、第2の板材2の抜き穴21の突口22がパッキン4の孔部41内に嵌り込んだ状態となる。そして、タッピンねじ3を第2の板材2の表側から抜き穴21及びパッキン4の孔部41に挿通させて、このタッピンねじ3のねじ軸33の先端部を第1の板材1のバーリング下穴11に突き当てた状態で、タッピンねじ3の頭部31をドライバー等の工具により締め付ける。すると、図2に示すように、タッピンねじ3のねじ軸33がバーリング下穴11の円筒部12の内周面に雌ねじを刻設しながら捻じ込まれる。タッピンねじ3の頭部31の下面32が第2の板材2の座面24に当接した後に、さらにタッピンねじ3を捻じ込むとタッピンねじ3の頭部31で第2の板材2が第1の板材1側へ押圧され、最終的にパッキン4が第1の板材1と第2の板材2との間に圧縮されて第2の板材2の抜き穴21の突口22の先端部23が第1の板材1のバーリング下穴11の周縁部13に当接した状態で締付が完了する(図1参照)。
Next, the operation of screwing the first plate material 1 and the second plate material 2 with the tapping screw 3 will be described.
The first plate member 1 and the second plate member 2 are combined with the packing 4 so that the burring pilot hole 11 of the first plate member 1, the hole 41 of the packing 4, and the punched hole 21 of the second plate member 2 coincide with each other. Overlay with intervening. At this time, the protrusion 22 of the punched hole 21 of the second plate member 2 is fitted into the hole 41 of the packing 4. Then, the tapping screw 3 is inserted from the front side of the second plate 2 into the hole 21 and the hole 41 of the packing 4, and the tip of the screw shaft 33 of the tapping screw 3 is inserted into the burring pilot hole of the first plate 1. 11, the head 31 of the tapping screw 3 is tightened with a tool such as a screwdriver. Then, as shown in FIG. 2, the screw shaft 33 of the tapping screw 3 is screwed in while engraving the female screw on the inner peripheral surface of the cylindrical portion 12 of the burring pilot hole 11. After the lower surface 32 of the head portion 31 of the tapping screw 3 abuts against the seating surface 24 of the second plate member 2, when the tapping screw 3 is further screwed, the second plate member 2 is moved to the first portion 31 by the head portion 31 of the tapping screw 3. The packing 4 is finally compressed between the first plate 1 and the second plate 2 so that the tip 23 of the protrusion 22 of the hole 21 in the second plate 2 is pressed. Tightening is completed in a state where the first plate 1 is in contact with the peripheral edge 13 of the burring pilot hole 11 (see FIG. 1).
以上の参考例のねじ締結構造によれば、抜き穴21の突口22の先端部23がバーリング下穴11の周縁部13に当接するようにしたので、タッピンねじ3をバーリング下穴11に螺合させた際に第1の板材1のバーリング下穴11の周縁部13がタッピンねじ3の引き込み力によって第2の板材2側へ盛り上がって変形することを確実に阻止することができる。また、タッピンねじ3の頭部31の下面32は、平坦面に形成されて第2の板材2の表側における抜き穴21の周縁部の平坦な座面24を押圧するので、抜き穴21の突口22が第1の板材1のバーリング下穴11の周縁部13を強く押し付けることができる。これにより、タッピンねじ3の引き込み力によって第1の板材1のバーリング下穴11の周縁部13が第2の板材2側へ盛り上がって変形することをより確実に阻止することができる。さらに、突口22の先端部23によってバーリング下穴11がタッピンねじ3の螺入で拡径しようとする力を抑え込むことができる。 According to the screw fastening structure of the reference example described above, the tip portion 23 of the projection 22 of the punch hole 21 is in contact with the peripheral portion 13 of the burring pilot hole 11, so that the tapping screw 3 is screwed into the burring pilot hole 11. It is possible to reliably prevent the peripheral portion 13 of the burring prepared hole 11 of the first plate 1 from rising and deforming to the second plate 2 side by the pulling force of the tapping screw 3 when combined. Further, the lower surface 32 of the head portion 31 of the tapping screw 3 is formed as a flat surface and presses the flat seating surface 24 at the peripheral portion of the through hole 21 on the front side of the second plate member 2. The mouth 22 can strongly press the peripheral portion 13 of the burring prepared hole 11 of the first plate 1. Thereby, it can prevent more reliably that the peripheral part 13 of the burring pilot hole 11 of the 1st board | plate material 1 swells and deform | transforms into the 2nd board | plate material 2 side by the drawing-in force of the tapping screw 3. FIG. Furthermore, the burring pilot hole 11 can suppress the force of expanding the diameter of the burring prepared hole 11 by screwing the tapping screw 3 by the tip portion 23 of the protrusion 22.
以上の結果、バーリング下穴11の雌ねじが破壊する限界のトルクである破壊トルクを増大することができ、ねじ締結に要求されるねじ締付能力を向上することができる。よって、第1の板材1の板厚を薄くしても、ねじ締結に要求される締付能力を十分に発揮することができるので、第1の板材1及び第2の板材2を薄板化して、重量の軽量化を図ることができ、また、製品コストを安くすることができる。また、抜き穴21の突口22がバーリング下穴11の周縁部13を強く押し付ける力の反力によってタッピンねじ3が強固に固定され、緩み止め効果が発揮される。   As a result, the breaking torque, which is the limit torque that the female screw of the burring pilot hole 11 breaks, can be increased, and the screw tightening ability required for screw fastening can be improved. Therefore, even if the plate thickness of the first plate 1 is made thin, the tightening ability required for screw fastening can be sufficiently exerted. Therefore, the first plate 1 and the second plate 2 are made thin. The weight can be reduced, and the product cost can be reduced. Further, the tapping screw 3 is firmly fixed by the reaction force of the force that the protrusion 22 of the punching hole 21 strongly presses the peripheral edge portion 13 of the burring lower hole 11, and the loosening prevention effect is exhibited.
また、タッピンねじ3は、段付タッピンねじのような特殊ねじを使用しなくても一般的なものを使用することで十分にバーリング下穴11の雌ねじの破壊トルクを向上することができる。従って、段付タッピンねじを使用する場合に比べて、タッピンねじ3を第2の板材2の抜き穴21や第1の板材1のバーリング下穴11に円滑に挿入することができ、タッピンねじ3の締結作業性を低下させることがない。また、段付タッピンねじを使用すると第2の板材2の抜き穴21の穴径が大きくなり、抜き穴21の周縁部13の強度を低下させ得るが、一般的なタッピンねじ3を使用することで段付タッピンねじを用いた場合のように第2の板材2の抜き穴21の穴径を大きくしなくてもよく、第2の板材2を薄板にした場合でも抜き穴21の周縁部13の強度を確保することができる。しかも、一般的なタッピンねじ3を使用することで、段付タッピンねじに比べてねじのコストを抑えることができる。   The tapping screw 3 can sufficiently improve the breaking torque of the internal thread of the burring pilot hole 11 by using a general screw without using a special screw such as a stepped tapping screw. Therefore, compared with the case where the stepped tapping screw is used, the tapping screw 3 can be smoothly inserted into the through hole 21 of the second plate member 2 or the burring pilot hole 11 of the first plate member 1. The fastening workability is not reduced. Further, when the stepped tapping screw is used, the hole diameter of the punched hole 21 of the second plate member 2 is increased, and the strength of the peripheral portion 13 of the punched hole 21 can be reduced. However, the general tapping screw 3 is used. As in the case of using a stepped tapping screw, it is not necessary to increase the diameter of the punched hole 21 of the second plate member 2, and the peripheral portion 13 of the punched hole 21 even when the second plate member 2 is thin. The strength of the can be ensured. In addition, by using a general tapping screw 3, the cost of the screw can be reduced as compared with the stepped tapping screw.
因みに、第1の板材1と第2の板材2とをタッピンねじ3で締結したねじ締結構造において、バーリング下穴11の雌ねじの破壊トルクを測定したところ、第2の板材2の抜き穴21に突口22を形成しない場合は、破壊トルクが1.7N・mであった。これに対して、図1に示す参考例のように第2の板材2の抜き穴21の周縁部に突口22を形成したものでは、破壊トルクが2.6N・mに増大された。従って、第2の板材2の抜き穴21の周縁部において、第1の板材1のバーリング下穴11の周縁部13を当接する突口22を形成することで、ねじ締付能力が格段に向上することが確認された。
なお、この破壊トルク試験で用いた板材1,2、パッキン4、タッピンねじ3の各条件は、以下のとおりである。
・第1の板材1:ステンレス材、板厚0.4mm、バーリング下穴11の内径3.2mm、円筒部12の長さ1.1mm
・第2の板材2:ステンレス材、板厚0.6mm、抜き穴21の内径4.5mm、突口22の長さ0.5mm(突口22を形成するのは参考例の場合)
・パッキン4:発泡樹脂材、厚み2mm(ねじ締付後は0.5mmに圧縮)、孔部41の内径6mm
・タッピンねじ3:ステンレス材、頭部31の外径8mm、頭部31の高さ3.5mm、ねじ軸33の山径3.8mm、ねじ軸33の谷径3.2mm、ねじ軸33のねじピッチ1.6mm、ねじ軸33の長さ10mm
Incidentally, in the screw fastening structure in which the first plate member 1 and the second plate member 2 are fastened with the tapping screw 3, when the breaking torque of the female screw of the burring pilot hole 11 is measured, the hole 21 of the second plate member 2 is measured. When the protrusion 22 was not formed, the breaking torque was 1.7 N · m. On the other hand, in the case where the protrusion 22 is formed in the peripheral portion of the punched hole 21 of the second plate member 2 as in the reference example shown in FIG. 1, the breaking torque is increased to 2.6 N · m. Therefore, the screw tightening ability is remarkably improved by forming the protrusion 22 that contacts the peripheral portion 13 of the burring lower hole 11 of the first plate member 1 at the peripheral portion of the punching hole 21 of the second plate member 2. Confirmed to do.
In addition, each conditions of the board | plate materials 1 and 2, the packing 4, and the tapping screw 3 which were used by this breaking torque test are as follows.
First plate material 1: stainless steel, plate thickness 0.4 mm, inner diameter of burring pilot hole 11 3.2 mm, length of cylindrical portion 12 1.1 mm
Second plate material 2: stainless steel, plate thickness 0.6 mm, inner diameter 4.5 mm of the punched hole 21, and length of the protrusion 22 0.5 mm (the protrusion 22 is formed in the reference example )
Packing 4: Foamed resin material, thickness 2 mm (compressed to 0.5 mm after screw tightening), inner diameter 6 mm of hole 41
Tapping screw 3: Stainless steel, outer diameter of head 31 is 8 mm, height of head 31 is 3.5 mm, crest diameter of screw shaft 33 is 3.8 mm, trough diameter of screw shaft 33 is 3.2 mm, screw shaft 33 Screw pitch 1.6mm, screw shaft 33 length 10mm
本発明の実施形態としては、図3に示すように、突口22Aは、先端部23に向かって小径となるテーパ状に形成され。この場合、テーパ状の突口22Aが弾性機能を発揮して突口22Aの先端部23によってバーリング下穴11を縮径方向に抑え込むことができる。従って、バーリング下穴11の雌ねじの破壊トルクをより増大することができ、ねじ締付能力をより向上することができる。また、テーパ状の突口22Aの弾性力の反力によってねじが強固に固定されるので、タッピンねじ3の緩み止め効果が向上される。なお、その他は、上述の参考例と同様の構成及び作用効果を有する。 As an embodiment of the present invention, as shown in FIG. 3,突口22A is Ru is tapered to a smaller diameter toward the distal end 23. In this case, the tapered protrusion 22A exhibits an elastic function, and the burring pilot hole 11 can be suppressed in the reduced diameter direction by the tip 23 of the protrusion 22A. Therefore, the breaking torque of the internal thread of the burring pilot hole 11 can be further increased, and the screw tightening ability can be further improved. Further, since the screw is firmly fixed by the reaction force of the elastic force of the tapered protrusion 22A, the effect of preventing the loosening of the tapping screw 3 is improved. Others have the same configuration and operational effects as the above-described reference example.
なお、他の参考例として、図4に示すように、第1の板材1のバーリング下穴11Aの基端部をテーパ状に形成し、第2の板材2の抜き穴21の突口22の先端部23がバーリング下穴11Aのテーパ部分5の周縁部13aに当接する構成としてもよい。この場合、第1の板材1のバーリング下穴11Aの基端部をテーパ状に形成することによりバーリング下穴11Aの周縁部13aの剛性を強くすることができ、しかも、抜き穴21の突口22の先端部23がバーリング下穴11のテーパ部分5の周縁部13aに当接するので、タッピンねじ3の引き上げ力によってバーリング下穴11Aのテーパ部分5の周縁部13aの変形をより確実に阻止することができる。従って、バーリング下穴11Aの雌ねじの破壊トルクをさらに増大することができ、ねじ締付能力をより向上することができる。 As another reference example, as shown in FIG. 4, the base end portion of the burring pilot hole 11 </ b> A of the first plate member 1 is formed in a tapered shape, and the protrusion 22 of the punch hole 21 of the second plate member 2 is formed. It is good also as a structure which the front-end | tip part 23 contact | abuts to the peripheral part 13a of the taper part 5 of 11 A of burring pilot holes. In this case, the rigidity of the peripheral portion 13a of the burring pilot hole 11A can be increased by forming the base end of the burring pilot hole 11A of the first plate 1 in a tapered shape, and the protrusion of the punch hole 21 22 is in contact with the peripheral portion 13a of the tapered portion 5 of the burring pilot hole 11, so that the pulling force of the tapping screw 3 more reliably prevents deformation of the peripheral portion 13a of the tapered portion 5 of the burring pilot hole 11A. be able to. Therefore, the breaking torque of the female screw of the burring pilot hole 11A can be further increased, and the screw tightening ability can be further improved.
なお、本発明は、上記実施形態のみに限定されず、本発明の要旨の範囲内で種々変更を施すことが可能である。
例えば、パッキン4を介在させずに、第1の板材1と第2の板材2とをねじで締結させるようにしてもよい。
また、締結物及び/又は被締結部は、板金等の板材に限らず、樹脂等の構造物であってもよい。
さらに、バーリング下穴11の円筒部12に予め雌ねじを刻設するようにして、ねじは、タッピンねじ3に代えて、バーリング下穴11の雌ねじに螺合可能なものを使用するようにしてもよい。
In addition, this invention is not limited only to the said embodiment, A various change is possible within the range of the summary of this invention.
For example , the first plate 1 and the second plate 2 may be fastened with screws without the packing 4 interposed.
Moreover, a fastening object and / or a to-be-fastened part are not only board | plate materials, such as sheet metal, but structures, such as resin, may be sufficient.
Further, a female screw is engraved in the cylindrical portion 12 of the burring pilot hole 11 in advance, and a screw that can be screwed into the female screw of the burring pilot hole 11 is used instead of the tapping screw 3. Good.
1 第1の板材(締結物)
2 第2の板材(被締結物)
3 タッピンねじ
4 パッキン
5 テーパ部分
11 バーリング下穴
12 円筒部
13 周縁部
21 抜き穴
22 突口
23 先端部
24 座面
31 頭部
32 下面
33 ねじ軸
41 孔部
1 First plate (fastened)
2 Second plate (fastened object)
3 Tapping screw 4 Packing 5 Tapered part 11 Burring pilot hole 12 Cylindrical part 13 Peripheral part 21 Perforated hole 22 Protrusion 23 Tip part 24 Seating surface 31 Head surface 32 Lower surface 33 Screw shaft 41 Hole

Claims (4)

  1. 締結物にバーリング下穴を形成し、被締結物に設けた抜き穴にねじを通してバーリング下穴に螺合させるねじ締結構造であって、
    被締結物の抜き穴の周縁部を立ち起こして突口を形成し、この突口を基端部から先端部まで連続して先端部に向かって小径となるテーパ状に形成し、ねじをバーリング下穴に螺合させるとテーパ状の突口の先端部がバーリング下穴の基端部の周縁にある周縁部であり且つ平坦面に当接する構成としたねじ締結構造。
    A screw fastening structure in which a burring pilot hole is formed in a fastening object, and a screw is inserted into a burring pilot hole through a screw hole provided in the article to be fastened,
    The peripheral edge of the hole to be fastened is raised to form a protrusion, and the protrusion is formed in a tapered shape with a small diameter toward the distal end continuously from the base end to the burring screw. A screw fastening structure in which the tip end portion of the tapered protrusion is a peripheral portion at the periphery of the base end portion of the burring pilot hole and abuts against a flat surface when screwed into the pilot hole.
  2. 請求項1に記載のねじ締結構造において、
    締結物と被締結物との間に突口の高さよりも厚い厚みを有するシール用のパッキンをねじ締結後に圧縮状態に介在させる構成としたねじ締結構造。
    The screw fastening structure according to claim 1,
    A screw fastening structure in which a seal packing having a thickness larger than the height of a protrusion is interposed between a fastening object and an object to be fastened and interposed in a compressed state after screw fastening.
  3. 請求項1又は2に記載のねじ締結構造において、
    締結物のバーリング下穴の基端部をテーパ状に形成し、被締結物の抜き穴の突口の先端部がバーリング下穴のテーパ状基端部の周縁にある周縁部であり且つ平坦面に当接する構成としたねじ締結構造。
    The screw fastening structure according to claim 1 or 2,
    The base end portion of the burring pilot hole of the fastening object is formed in a taper shape, and the tip end portion of the protruding hole of the fastening hole of the fastening object is a peripheral portion on the peripheral edge of the taper base end portion of the burring pilot hole and is a flat surface Screw fastening structure that is configured to abut against the screw.
  4. 請求項1〜3のいずれか1項に記載のねじ締結構造において、
    ねじの頭部の下面は、平坦面に形成されており、被締結物の突口を形成しない表側の抜き穴の周縁部における平坦な座面を押圧する構成としたねじ締結構造。
    In the screw fastening structure according to any one of claims 1 to 3,
    A screw fastening structure in which a lower surface of a screw head is formed as a flat surface and presses a flat seating surface at a peripheral portion of a front-side punch hole that does not form a protrusion of a fastening object.
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