WO2021065024A1 - Screw fastening structure - Google Patents
Screw fastening structure Download PDFInfo
- Publication number
- WO2021065024A1 WO2021065024A1 PCT/JP2019/051375 JP2019051375W WO2021065024A1 WO 2021065024 A1 WO2021065024 A1 WO 2021065024A1 JP 2019051375 W JP2019051375 W JP 2019051375W WO 2021065024 A1 WO2021065024 A1 WO 2021065024A1
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- WIPO (PCT)
- Prior art keywords
- screw
- hole
- fastened
- diameter
- fastening
- Prior art date
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- 238000010079 rubber tapping Methods 0.000 claims abstract description 18
- 229920005992 thermoplastic resin Polymers 0.000 abstract description 7
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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Classifications
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
Definitions
- the present invention relates to a screw fastening structure for fastening a resin fastening member and a to be fastened member with screw parts.
- a pilot hole is provided in the fastened body
- a through hole also known as a wrong hole
- the fastened body is laminated with the fastened body.
- a method is known in which a screw shaft portion of a tappin screw is inserted through a through hole of a fastened body and screwed into a pilot hole of the fastened body to fix the fastened body to the fastened body.
- tapping screw when the fastening body or the fastened body is a thermoplastic resin, it is deformed in a thermal environment, which causes rattling, which causes loosening of the screw.
- the member fastening structure shown in Patent Document 1 is used as the screw fastening structure for preventing the screw from loosening due to rattling.
- a metal insert nut 220 is inserted into the prepared hole 210 of the fastening body 200, and a metal collar 320 is inserted into the through hole 310 of the body to be fastened 300.
- the insert nut 220 is screwed into the inner peripheral surface of the insert nut 220 while forming a female screw with the screw shaft portion 110 of the tapping screw 100. Therefore, the metal insert nut 220 and the collar 320 are less likely to be deformed than the thermoplastic resin in a thermal environment, so that loosening of the screw due to rattling can be prevented.
- the present invention has been created in view of the above problems, and realizes weight reduction in the fastening structure of the fastening body and the fastened body made of a thermoplastic resin without causing loosening in a thermal environment. It is an object of the present invention to provide a screw fastening structure.
- the above-mentioned problem is composed of a fastening body having a hole, a body to be fastened having a through hole, and a tapping screw having a head and a screw shaft portion, and the screw shaft portion of the tapping screw is fastened.
- the screw fastening structure is characterized in that the fastened body is fixed to the fastened body by inserting it into the through hole of the fastened body and the through hole of the fastened body and screwing it into both the hole of the fastened body and the through hole of the fastened body. it can.
- the screw shaft portion of the tapping screw has a small-diameter screw portion provided on one side in the axial direction and a large-diameter screw portion provided on the other side in the axial direction. It is preferable to screw the diameter screw portion into the through hole of the object to be fastened.
- the inner diameter d1 of the hole of the fastener, the inner diameter d2 of the through hole of the object to be fastened, the outer diameter D1 of the small diameter screw portion of the screw shaft portion, and the outer diameter D2 of the large diameter screw portion of the screw shaft portion are large and small.
- the relationship is preferably d1 ⁇ D1 ⁇ d2 ⁇ D2.
- the total length of the small-diameter screw portion is larger than the thickness of the object to be fastened, and the total length of the large-diameter screw portion is smaller than the thickness of the body to be fastened.
- the fastening structure of the present invention can prevent loosening and rattling in a thermal environment without using insert nuts and insert collars for the fastener and the object to be fastened made of thermoplastic resin. Further, since the insert nut and the insert collar are not required, the weight can be reduced.
- reference numeral 1 denotes a screw fastening structure of the present invention, which is composed of a tapping screw 10, a fastening body 20, and a body to be fastened 30 fixed to the fastening body 20 by the tapping screw 10.
- the tapping screw 10 is composed of a head portion 11 having a cross hole (not shown) into which a driver bit can be fitted, and a screw shaft portion 12 integrally molded with the head portion 11.
- the cross-sectional shape of the screw shaft portion 12 excluding the screw thread is circular or substantially triangular.
- the screw shaft portion 12 is composed of a small-diameter screw portion 13 provided on the tip side and a large-diameter screw portion 14 provided on the head side, and the screw outer diameter of the small-diameter screw portion 13 is D1 and large.
- the outer diameter of the screw portion 14 is set to D2
- the magnitude relationship between the dimensions of D1 and D2 is set so that D1 ⁇ D2.
- the small-diameter screw portion 13 and the large-diameter screw portion 14 may be either a right-hand thread or a left-hand thread.
- pitches of the small-diameter screw portion 13 and the large-diameter screw portion 14 are set to be the same.
- the total length T1 of the small-diameter screw portion 13 of the screw shaft portion 12 is set to be larger than the total length T2 of the large-diameter screw portion 14.
- Both the fastening body 20 and the fastening body 30 are made of a thermoplastic resin. Further, the fastening body 20 is provided with a bottomed hole 21 having an opening on the plane of the fastening body 20 as a pilot hole, and the bottomed hole 21 is a bag hole through which the bottom surface of the fastening body 20 does not penetrate. It has become.
- the object to be fastened 30 is provided with a through hole 31 as a through hole that penetrates from the flat surface of the body to be fastened 30 to the bottom surface side. Stepped portions 21a and 31b are formed in the bottomed holes 21 and the through holes 31 at the openings on the flat surface side, respectively.
- the fastened body 30 is laminated on the fastened body 20 so that the hole 21 of the fastened body 20 and the through hole 31 of the fastened body 30 communicate with each other.
- the bottomed hole 21 of the fastening body 20 may be a through hole, that is, a hole.
- the magnitude relationship between the dimensions of d1 and d2 is d1 ⁇ d2.
- the inner diameter d1 of the bottomed hole 21 of the fastening body 20 is d1 and the inner diameter of the through hole 31 of the fastened body 30 is d2
- the magnitude relationship between the dimensions of d1 and d2 is d1 ⁇ d2.
- the inner diameter d1 of the bottomed hole 21 of the fastening body 20 the inner diameter d2 of the through hole 31 of the fastened body 30, the outer diameter D1 of the small diameter screw portion 13 of the screw shaft portion 2, and the large diameter of the screw shaft portion 2
- the magnitude relationship between the screw portion 14 and the outer diameter D2 is d1 ⁇ D1 ⁇ d2 ⁇ D2.
- the total length T1 of the small-diameter screw portion 13 is set to be larger than the thickness t2 of the object to be fastened 30, and the total length T2 of the large-diameter screw portion 14 is set to be smaller than the thickness t1 of the body to be fastened 20.
- the screw shaft portion 12 of the tapping screw 10 is inserted into the through hole 31 of the fastened body 30.
- the screw shaft portion 12 of the tapping screw 10 is inserted into the through hole 31 of the fastened body 30.
- the bottomed hole 21 of the fastening body 20 is formed without touching the inner peripheral surface of the through hole 31. Will be inserted.
- the small-diameter screw portion 13 is screwed while forming a female screw on the inner peripheral surface of the bottomed hole 21.
- the large-diameter threaded portion 14 is inserted into the through hole 31 of the object to be fastened 30.
- the large-diameter screw portion 14 forms a female screw on the inner peripheral surface of the through hole 31. Screwed in.
- the tappin screw 10 is screwed into the fastening body 20 and the fastened body 30 until the seating surface of the head 11 is seated on the flat surface of the fastened body 30.
- the boundary portion between the small diameter screw portion 13 and the large diameter screw portion 14 is located inside the through hole 31 of the object to be fastened 30.
- the reason why the size relationship between the large-diameter screw portion 14 of the portion 2 and the outer diameter D2 is d1 ⁇ D1 ⁇ d2 ⁇ D2 is that the inner diameter d1 of the bottomed hole 21 and the inner diameter of the through hole 31 are assumed.
- the small-diameter threaded portion 13 is screwed in while forming a female thread on the inner peripheral surface of the through hole 31, so that it takes more time than necessary for screwing. Further, in such a case, when the positional relationship between the fastening body 20 and the fastened body 30 is displaced to the left or right, the tapping screw 10 cannot be screwed in. In order to prevent such a problem, the size relationship of the above-mentioned dimensions is established.
- the screw fastening structure 1 when the resin fastening body 20 and the fastening body 30 are contracted and deformed due to the influence of heat, the axial force is lost, but the screw shaft portion 12 is the fastening body. Since it is screwed into both the 20 and the object to be fastened 30, rattling does not occur, and a loosening prevention effect can be obtained by not causing rattling that causes loosening. Further, in this way, even if parts such as an insert collar and an insert nut are not used, the resin fastening body 20 and the fastened body 30 are effective in preventing loosening, which can contribute to weight reduction. it can.
- Screw fastening structure 10 Tapping screw 11 Head 12 Screw shaft 13 Small diameter screw 14 Large diameter screw 20 Fastening body 21 Bottomed hole 30 Fastened body 31 Through hole
Abstract
[Problem] To provide a screw fastening structure for preventing, even in a heat environment, loosening of a fastening body or a fastened body that are formed of a thermoplastic resin, the screw fastening structure also enabling reduction in weight. [Solution] A screw fastening structure comprises: a fastening body (20) with a bottomed hole (21) drilled therein; a fastened body (30) with a through-hole (31) drilled therein; and a tapping screw (10) comprising a head portion (11) and a screw shaft portion (12), the screw shaft portion (12) of the tapping screw (10) being inserted through the bottomed hole (21) in the fastening body (20) and the through-hole (31) in the fastened body (30) and being screwed in both the bottomed hole (21) and the through-hole (31) so as to fix the fastened body (30) to the fastening body (20), in which an overall length (T1) of a small-diameter screw portion (13) is larger than a thickness (t2) of the fastened body, and an overall length (T2) of a large-diameter screw portion (14) is smaller than the thickness (t2) of the fastened body.
Description
本発明は、樹脂製の締結部材と被締結部材をねじ部品で締結するねじ締結構造に関する。
The present invention relates to a screw fastening structure for fastening a resin fastening member and a to be fastened member with screw parts.
従来から、一般的なタッピンねじの使用方法としては、締結体に下穴を設けるとともに、被締結体に通し穴（別名、バカ穴）を設け、締結体に被締結体を積層した状態で、タッピンねじのねじ軸部を被締結体の通し穴から挿通して締結体の下穴にねじ込むことにより、締結体に被締結体を固定する方法が知られている。
Conventionally, as a general method of using a tapping screw, a pilot hole is provided in the fastened body, a through hole (also known as a stupid hole) is provided in the fastened body, and the fastened body is laminated with the fastened body. A method is known in which a screw shaft portion of a tappin screw is inserted through a through hole of a fastened body and screwed into a pilot hole of the fastened body to fix the fastened body to the fastened body.
しかしながら、上記タッピンねじでは、締結体あるいは被締結体が熱可塑性樹脂の場合、熱環境下において変形してしまうため、ガタツキが起こり、これがねじの緩みを生じさせる原因になっていた。
However, in the above-mentioned tapping screw, when the fastening body or the fastened body is a thermoplastic resin, it is deformed in a thermal environment, which causes rattling, which causes loosening of the screw.
そこで、熱可塑性樹脂で成る締結体あるいは被締結体にタッピンねじを使用する場合には、ガタツキによるねじの緩みを防止するねじ締結構造として、特許文献１に示す部材締結構造が用いられる。この部材締結構造は、図２に示すように、締結体２００の下穴２１０に金属製のインサートナット２２０を挿入するとともに、被締結体３００の通し穴３１０に金属製のカラー３２０を挿入し、インサートナット２２０の内周面にタッピンねじ１００のねじ軸部１１０でめねじを形成しながらねじ込むように構成されている。このため、金属製のインサートナット２２０およびカラー３２０は、熱環境下において熱可塑性樹脂よりも変形しにくいので、ガタツキによるねじの緩みを防止できる。
Therefore, when a tapping screw is used for the fastening body or the fastened body made of a thermoplastic resin, the member fastening structure shown in Patent Document 1 is used as the screw fastening structure for preventing the screw from loosening due to rattling. In this member fastening structure, as shown in FIG. 2, a metal insert nut 220 is inserted into the prepared hole 210 of the fastening body 200, and a metal collar 320 is inserted into the through hole 310 of the body to be fastened 300. The insert nut 220 is screwed into the inner peripheral surface of the insert nut 220 while forming a female screw with the screw shaft portion 110 of the tapping screw 100. Therefore, the metal insert nut 220 and the collar 320 are less likely to be deformed than the thermoplastic resin in a thermal environment, so that loosening of the screw due to rattling can be prevented.
しかしながら、特許文献１に示す部材締結構造では、インサートナットおよび金属製のカラーを挿入しなければならないため、部品点数および重量の増加が問題となっている。
However, in the member fastening structure shown in Patent Document 1, since the insert nut and the metal collar must be inserted, an increase in the number of parts and the weight becomes a problem.
本発明は、上記問題に鑑みて創生されたものであり、熱可塑性樹脂で成る締結体と被締結体の締結構造において、熱環境下で緩みを発生させることなく、かつ軽量化を実現するねじ締結構造を提供することを目的とする。
The present invention has been created in view of the above problems, and realizes weight reduction in the fastening structure of the fastening body and the fastened body made of a thermoplastic resin without causing loosening in a thermal environment. It is an object of the present invention to provide a screw fastening structure.
上記課題は、孔が穿設された締結体と、貫通孔が穿設された被締結体と、頭部およびねじ軸部を備えたタッピンねじとから成り、タッピンねじのねじ軸部を締結体の孔および被締結体の貫通孔に挿通し、締結体の孔と被締結体の貫通孔との双方にねじ込むことにより締結体に被締結体を固定することを特徴とするねじ締結構造によって解決できる。
The above-mentioned problem is composed of a fastening body having a hole, a body to be fastened having a through hole, and a tapping screw having a head and a screw shaft portion, and the screw shaft portion of the tapping screw is fastened. The screw fastening structure is characterized in that the fastened body is fixed to the fastened body by inserting it into the through hole of the fastened body and the through hole of the fastened body and screwing it into both the hole of the fastened body and the through hole of the fastened body. it can.
なお、タッピンねじのねじ軸部が、軸方向の一方に設けられる小径ねじ部と、軸方向の他方に設けられる大径ねじ部とを有し、小径ねじ部を締結体の孔にねじ込むとともに大径ねじ部を被締結体の貫通孔にねじ込むことが好ましい。
The screw shaft portion of the tapping screw has a small-diameter screw portion provided on one side in the axial direction and a large-diameter screw portion provided on the other side in the axial direction. It is preferable to screw the diameter screw portion into the through hole of the object to be fastened.
なお、締結体の孔の内径ｄ１と、被締結体の貫通孔の内径ｄ２と、ねじ軸部の小径ねじ部の外径Ｄ１と、ねじ軸部の大径ねじ部の外径Ｄ２との大小関係は、ｄ１＜Ｄ１＜ｄ２＜Ｄ２であることが好ましい。
The inner diameter d1 of the hole of the fastener, the inner diameter d2 of the through hole of the object to be fastened, the outer diameter D1 of the small diameter screw portion of the screw shaft portion, and the outer diameter D2 of the large diameter screw portion of the screw shaft portion are large and small. The relationship is preferably d1 <D1 <d2 <D2.
なお、小径ねじ部の全長は、被締結体の厚みより大きく、かつ大径ねじ部の全長は、被締結体の厚みより小さいことが好ましい。
It is preferable that the total length of the small-diameter screw portion is larger than the thickness of the object to be fastened, and the total length of the large-diameter screw portion is smaller than the thickness of the body to be fastened.
本発明の締結構造は、熱環境下において、熱可塑性樹脂で成る締結体および被締結体に対してインサートナットおよびインサートカラーを用いずとも、緩みやガタツキの発生を防止することができる。また、インサートナットおよびインサートカラーが不要になるため、軽量化を実現することができる。
The fastening structure of the present invention can prevent loosening and rattling in a thermal environment without using insert nuts and insert collars for the fastener and the object to be fastened made of thermoplastic resin. Further, since the insert nut and the insert collar are not required, the weight can be reduced.
以下、図面に基づいて本発明の実施形態を説明する。図１において、１は本発明のねじ締結構造であり、タッピンねじ１０と、締結体２０と、締結体２０にタッピンねじ１０により固定される被締結体３０とから構成される。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a screw fastening structure of the present invention, which is composed of a tapping screw 10, a fastening body 20, and a body to be fastened 30 fixed to the fastening body 20 by the tapping screw 10.
タッピンねじ１０は、ドライバビットが嵌合可能な十字穴（図示せず）を有する頭部１１と、この頭部１１に一体成形されるねじ軸部１２とから構成される。ねじ山を除いたねじ軸部１２の横断面形状は、円形または略三角形を成している。
The tapping screw 10 is composed of a head portion 11 having a cross hole (not shown) into which a driver bit can be fitted, and a screw shaft portion 12 integrally molded with the head portion 11. The cross-sectional shape of the screw shaft portion 12 excluding the screw thread is circular or substantially triangular.
また、ねじ軸部１２は、先端側に設けられる小径ねじ部１３と、頭部側に設けられる大径ねじ部１４とから構成されており、小径ねじ部１３のおねじ外径をＤ１、大径ねじ部１４のおねじ外径をＤ２としたとき、Ｄ１とＤ２との寸法の大小関係は、Ｄ１＜Ｄ２となるように設定されている。なお、小径ねじ部１３および大径ねじ部１４は、右ねじまたは左ねじのどちらであってもよい。
Further, the screw shaft portion 12 is composed of a small-diameter screw portion 13 provided on the tip side and a large-diameter screw portion 14 provided on the head side, and the screw outer diameter of the small-diameter screw portion 13 is D1 and large. When the outer diameter of the screw portion 14 is set to D2, the magnitude relationship between the dimensions of D1 and D2 is set so that D1 <D2. The small-diameter screw portion 13 and the large-diameter screw portion 14 may be either a right-hand thread or a left-hand thread.
さらに、小径ねじ部１３および大径ねじ部１４のピッチは、同一に設定されている。
Further, the pitches of the small-diameter screw portion 13 and the large-diameter screw portion 14 are set to be the same.
その上、ねじ軸部１２の小径ねじ部１３の全長T１は、大径ねじ部１４の全長T２よりも大きく設定されている。
Moreover, the total length T1 of the small-diameter screw portion 13 of the screw shaft portion 12 is set to be larger than the total length T2 of the large-diameter screw portion 14.
締結体２０および被締結体３０は、いずれれも熱可塑性樹脂で成る。また、締結体２０には、下穴として、締結体２０の平面上に開口を有する有底孔２１が穿設されており、この有底孔２１は、締結体２０の底面が貫通しない袋穴になっている。一方、被締結体３０には、通し穴として、被締結体３０の平面から底面側に貫通する貫通孔３１が穿設されている。これら有底孔２１および貫通孔３１には、平面側の開口部分にそれぞれ段付き部２１ａ、３１ｂが形成されている。そして、締結体２０の孔２１と被締結体３０の貫通孔３１とを連通させるようにして、締結体２０には被締結体３０が積層されている。なお、締結体２０の有底孔２１は、貫通孔であってもよく、つまり孔であればよい。
Both the fastening body 20 and the fastening body 30 are made of a thermoplastic resin. Further, the fastening body 20 is provided with a bottomed hole 21 having an opening on the plane of the fastening body 20 as a pilot hole, and the bottomed hole 21 is a bag hole through which the bottom surface of the fastening body 20 does not penetrate. It has become. On the other hand, the object to be fastened 30 is provided with a through hole 31 as a through hole that penetrates from the flat surface of the body to be fastened 30 to the bottom surface side. Stepped portions 21a and 31b are formed in the bottomed holes 21 and the through holes 31 at the openings on the flat surface side, respectively. Then, the fastened body 30 is laminated on the fastened body 20 so that the hole 21 of the fastened body 20 and the through hole 31 of the fastened body 30 communicate with each other. The bottomed hole 21 of the fastening body 20 may be a through hole, that is, a hole.
また、締結体２０の有底孔２１の内径をｄ１、被締結体３０の貫通孔３１の内径をｄ２としたとき、ｄ１とｄ２との寸法の大小関係は、ｄ１＜ｄ２となっている。さらに、締結体２０の有底孔２１の内径ｄ１と、被締結体３０の貫通孔３１の内径ｄ２と、ねじ軸部２の小径ねじ部１３の外径Ｄ１と、ねじ軸部２の大径ねじ部１４の外径Ｄ２との寸法の大小関係は、ｄ１＜Ｄ１＜ｄ２＜Ｄ２となっている。
Further, when the inner diameter of the bottomed hole 21 of the fastening body 20 is d1 and the inner diameter of the through hole 31 of the fastened body 30 is d2, the magnitude relationship between the dimensions of d1 and d2 is d1 <d2. Further, the inner diameter d1 of the bottomed hole 21 of the fastening body 20, the inner diameter d2 of the through hole 31 of the fastened body 30, the outer diameter D1 of the small diameter screw portion 13 of the screw shaft portion 2, and the large diameter of the screw shaft portion 2 The magnitude relationship between the screw portion 14 and the outer diameter D2 is d1 <D1 <d2 <D2.
さらに、小径ねじ部１３の全長T１は、被締結体３０の厚みｔ２より大きく、かつ大径ねじ部１４の全長T２は、被締結体２０の厚みｔ１より小さく設定されている。
Further, the total length T1 of the small-diameter screw portion 13 is set to be larger than the thickness t2 of the object to be fastened 30, and the total length T2 of the large-diameter screw portion 14 is set to be smaller than the thickness t1 of the body to be fastened 20.
上記ねじ締結構造１を構成するための締結方法としては、まず、締結体２０の上に被締結体３０を積層した状態で、被締結体３０の貫通孔３１にタッピンねじ１０のねじ軸部１２を挿入する。このとき、小径ねじ部１３の外径Ｄ１は、被締結体３０の貫通孔３１の内径ｄ２よりも小さいので、貫通孔３１の内周面に触れることなく、締結体２０の有底孔２１に挿入される。
As a fastening method for forming the screw fastening structure 1, first, in a state where the fastened body 30 is laminated on the fastened body 20, the screw shaft portion 12 of the tapping screw 10 is inserted into the through hole 31 of the fastened body 30. To insert. At this time, since the outer diameter D1 of the small-diameter screw portion 13 is smaller than the inner diameter d2 of the through hole 31 of the object to be fastened 30, the bottomed hole 21 of the fastening body 20 is formed without touching the inner peripheral surface of the through hole 31. Will be inserted.
続いて、小径ねじ部１３の外径Ｄ１は、締結体２０の有底孔２１の内径よりも大きいので、小径ねじ部１３は、有底孔２１の内周面に雌ねじを形成しながらねじ込まれるとともに、大径ねじ部１４が被締結体３０の貫通孔３１に挿入される。このとき、大径ねじ部１４の外径Ｄ２は、被締結体３０の貫通孔３１の内径ｄ２よりも大きいので、大径ねじ部１４は、貫通孔３１の内周面に雌ねじを形成しながらねじ込まれる。このようにして、タッピンねじ１０は、頭部１１の座面が被締結体３０の平面に着座するまで、締結体２０および被締結体３０にねじ込まれる。このようにしてねじ込みが完了した状態において、小径ねじ部１３と大径ねじ部１４との境界部分は、被締結体３０の貫通孔３１の内部に位置している。
Subsequently, since the outer diameter D1 of the small-diameter screw portion 13 is larger than the inner diameter of the bottomed hole 21 of the fastening body 20, the small-diameter screw portion 13 is screwed while forming a female screw on the inner peripheral surface of the bottomed hole 21. At the same time, the large-diameter threaded portion 14 is inserted into the through hole 31 of the object to be fastened 30. At this time, since the outer diameter D2 of the large-diameter screw portion 14 is larger than the inner diameter d2 of the through hole 31 of the object to be fastened 30, the large-diameter screw portion 14 forms a female screw on the inner peripheral surface of the through hole 31. Screwed in. In this way, the tappin screw 10 is screwed into the fastening body 20 and the fastened body 30 until the seating surface of the head 11 is seated on the flat surface of the fastened body 30. In the state where the screwing is completed in this way, the boundary portion between the small diameter screw portion 13 and the large diameter screw portion 14 is located inside the through hole 31 of the object to be fastened 30.
また、上述のように、締結体２０の有底孔２１の内径ｄ１と、被締結体３０の貫通孔３１の内径ｄ２と、ねじ軸部２の小径ねじ部１３の外径Ｄ１と、ねじ軸部２の大径ねじ部１４の外径Ｄ２との寸法の大小関係が、ｄ１＜Ｄ１＜ｄ２＜Ｄ２となっている理由としては、仮に、有底孔２１の内径ｄ１と貫通孔３１の内径ｄ２とを同一寸法ｄ１にした場合、小径ねじ部１３は、貫通孔３１の内周面にも雌ねじを形成しながらねじ込まれることになるので、ねじ込みに必要以上に時間を要することになる。また、このような場合、締結体２０と被締結体３０との位置関係が左右にずれたとき、タッピンねじ１０をねじ込めなくなる。このような問題を防止するために、上述した寸法の大小関係になっている。
Further, as described above, the inner diameter d1 of the bottomed hole 21 of the fastening body 20, the inner diameter d2 of the through hole 31 of the fastened body 30, the outer diameter D1 of the small diameter screw portion 13 of the screw shaft portion 2, and the screw shaft. The reason why the size relationship between the large-diameter screw portion 14 of the portion 2 and the outer diameter D2 is d1 <D1 <d2 <D2 is that the inner diameter d1 of the bottomed hole 21 and the inner diameter of the through hole 31 are assumed. When d2 has the same size as d1, the small-diameter threaded portion 13 is screwed in while forming a female thread on the inner peripheral surface of the through hole 31, so that it takes more time than necessary for screwing. Further, in such a case, when the positional relationship between the fastening body 20 and the fastened body 30 is displaced to the left or right, the tapping screw 10 cannot be screwed in. In order to prevent such a problem, the size relationship of the above-mentioned dimensions is established.
上記ねじ締結構造１によれば、樹脂製の締結体２０および被締結体３０が熱の影響により収縮変形したとき、軸力は失われてしまうことになるが、ねじ軸部１２が、締結体２０と被締結体３０との双方にねじ込まれているので、ガタツキは生じず、緩みの原因となるガタツキを生じさせないことによる緩み止め効果を得ることができる。また、このように、インサートカラーやインサートナットなどの部品を使用しなくても、樹脂製の締結体２０および被締結体３０に対して緩み止め効果を発揮するので、軽量化に寄与することができる。
According to the screw fastening structure 1, when the resin fastening body 20 and the fastening body 30 are contracted and deformed due to the influence of heat, the axial force is lost, but the screw shaft portion 12 is the fastening body. Since it is screwed into both the 20 and the object to be fastened 30, rattling does not occur, and a loosening prevention effect can be obtained by not causing rattling that causes loosening. Further, in this way, even if parts such as an insert collar and an insert nut are not used, the resin fastening body 20 and the fastened body 30 are effective in preventing loosening, which can contribute to weight reduction. it can.
なお、本発明の各部の具体的な構成は、上述した実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々変形が可能である。
The specific configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
１ ねじ締結構造
１０ タッピンねじ
１１ 頭部
１２ ねじ軸部
１３ 小径ねじ部
１４ 大径ねじ部
２０ 締結体
２１ 有底孔
３０ 被締結体
３１ 貫通孔
1Screw fastening structure 10 Tapping screw 11 Head 12 Screw shaft 13 Small diameter screw 14 Large diameter screw 20 Fastening body 21 Bottomed hole 30 Fastened body 31 Through hole
１０ タッピンねじ
１１ 頭部
１２ ねじ軸部
１３ 小径ねじ部
１４ 大径ねじ部
２０ 締結体
２１ 有底孔
３０ 被締結体
３１ 貫通孔
1
Claims (4)
- 孔が穿設された締結体と、貫通孔が穿設された被締結体と、頭部およびねじ軸部を備えたタッピンねじとから成り、
タッピンねじのねじ軸部を締結体の孔および被締結体の貫通孔に挿通し、締結体の孔と被締結体の貫通孔との双方にねじ込むことにより締結体に被締結体を固定することを特徴とするねじ締結構造。 It consists of a fastened body with a hole, a fastened body with a through hole, and a tapping screw having a head and a screw shaft.
Fixing the fastened body to the fastened body by inserting the screw shaft portion of the tapping screw into the hole of the fastened body and the through hole of the fastened body and screwing it into both the hole of the fastened body and the through hole of the fastened body. A screw fastening structure characterized by. - タッピンねじのねじ軸部が、軸方向の一方に設けられる小径ねじ部と、軸方向の他方に設けられる大径ねじ部とを有し、小径ねじ部を締結体の孔にねじ込むとともに大径ねじ部を被締結体の貫通孔にねじ込むことを特徴とする請求項１に記載のねじ締結構造。 The screw shaft portion of the tapping screw has a small-diameter screw portion provided on one side in the axial direction and a large-diameter screw portion provided on the other side in the axial direction. The screw fastening structure according to claim 1, wherein the portion is screwed into a through hole of the object to be fastened.
- 締結体の孔の内径ｄ１と、被締結体の貫通孔の内径ｄ２と、ねじ軸部の小径ねじ部の外径Ｄ１と、ねじ軸部の大径ねじ部の外径Ｄ２との大小関係は、ｄ１＜Ｄ１＜ｄ２＜Ｄ２であることを特徴とする請求項１または２に記載のねじ締結構造。 What is the magnitude relationship between the inner diameter d1 of the hole of the fastener, the inner diameter d2 of the through hole of the object to be fastened, the outer diameter D1 of the small diameter screw portion of the screw shaft portion, and the outer diameter D2 of the large diameter screw portion of the screw shaft portion? , D1 <D1 <d2 <D2. The screw fastening structure according to claim 1 or 2.
- 小径ねじ部の全長T１は、被締結体の厚みｔ２より大きく、かつ大径ねじ部の全長T２は、被締結体の厚みｔ２より小さいことを特徴とする請求項１乃至３の何れかに記載のねじ締結構造。
The invention according to any one of claims 1 to 3, wherein the total length T1 of the small-diameter threaded portion is larger than the thickness t2 of the object to be fastened, and the total length T2 of the large-diameter threaded portion is smaller than the thickness t2 of the fastened body. Screw fastening structure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-180565 | 2019-09-30 | ||
| JP2019180565A JP2021055778A (en) | 2019-09-30 | 2019-09-30 | Screw fastening structure |
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| Publication Number | Publication Date |
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| WO2021065024A1 true WO2021065024A1 (en) | 2021-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2019/051375 WO2021065024A1 (en) | 2019-09-30 | 2019-12-27 | Screw fastening structure |
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| WO (1) | WO2021065024A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0719604U (en) * | 1993-09-13 | 1995-04-07 | 富士通株式会社 | Screw fastening structure |
| JPH10311317A (en) * | 1997-05-09 | 1998-11-24 | Sannohashi:Kk | Two members fastening method and bolt used for its method |
| JP2018112292A (en) * | 2017-01-13 | 2018-07-19 | 日東精工株式会社 | Fastening structure |
| JP2019113111A (en) * | 2017-12-22 | 2019-07-11 | 日東精工株式会社 | Member fastening structure |
-
2019
- 2019-09-30 JP JP2019180565A patent/JP2021055778A/en active Pending
- 2019-12-27 WO PCT/JP2019/051375 patent/WO2021065024A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0719604U (en) * | 1993-09-13 | 1995-04-07 | 富士通株式会社 | Screw fastening structure |
| JPH10311317A (en) * | 1997-05-09 | 1998-11-24 | Sannohashi:Kk | Two members fastening method and bolt used for its method |
| JP2018112292A (en) * | 2017-01-13 | 2018-07-19 | 日東精工株式会社 | Fastening structure |
| JP2019113111A (en) * | 2017-12-22 | 2019-07-11 | 日東精工株式会社 | Member fastening structure |
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| JP2021055778A (en) | 2021-04-08 |
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